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Klinik fuer Radiologische Diagnostik. Prior to contrast injection, 10 mg of furosemide were administered intravenously. Secondary to the precontrast furosemide injection, the increase of the renal excretion rate allows complete visualisation of the entire collecting system within 10 minutes following Gd injection.

Maximum intensity projections provide a three-dimensional overview of the ureters separate from the bladder. To achieve detailed anatomic imaging of the calices, both optimal distension and high resolution sequences are prerequisites which cannot be realized by means of survey urograms only. Vor der Kontrastmittelgabe wurden jeweils 10 mg Furosemid intravenoes verabreicht.

Nach initialer Steigerung des Harnflusses durch Furosemidgabe wurden Uebersichtsurogramme mit vollstaendig durchzeichnenden Ureteren bereits 10 min nach Gd-Injektion erzielt. Maximumintensitaetsprojektionen ermoeglichten die Beurteilung des dreidimensionalen Verlaufes der Ureteren ohne Blasenueberlagerung. Eine genauere anatomische Darstellung der Nierenkelche erforderte neben einem guten Fuellungszustand eine moeglichst hohe Sequenzaufloesung, die mit Uebersichtsurogrammen allein nicht zu erreichen war. Development of new heterogeneous catalysts for the decomposition of methanol into hydrogen and carbon monoxide applying high throughput methods; Entwicklung neuer heterogener Katalysatoren zur Spaltung von Methanol in Wasserstoff und Kohlenmonoxid mittels Hochdurchsatz-Methoden.

The topic of this thesis has been the development of new heterogeneous catalysts for the decomposition of methanol into hydrogen and carbon monoxide. As an important constraint here, the content of noble metals of the catalysts should be as low as possible. High-throughput-methods were applied in some of the syntheses and experiments to accelerate the development, as, for example, the use of liquid based sol-gel syntheses and the examination of catalyst libraries by spatial resolution gas chromatography. This screening technique allowed to test up to different substances during one single experiment.

Then, different combinatorial strategies were applied. First, these methods led to a highly active and stable catalyst in the ternary system of Cu-Ni-Zn, which showed high conversion and selectivity comparable to an industrial reference catalyst. Its activity during an 18 hour long term run was constant in contrast to the reference. Second, an additional approach starting from a broader variety of elements led to a Ce- Ru- and to a Cr-Ru-catalyst. Both of them were highly active in short term experiments, but lost their outstanding performances during long term runs.

Um diesen Prozess zu beschleunigen, wurden in einem Teil der Synthesen und Experimente Hochdurchsatzmethoden verwendet. Neben der Roboter gestuetzten Sol-Gel-Synthese umfasste dies die Untersuchung von Katalysatorbibliotheken mittels ortsaufgeloester Gaschromatographie, die es ermoeglichte, in einem Experiment bis zu verschiedene Substanzen auf ihre katalytische Aktivitaet zu testen.

Unter Anwendung verschiedener kombinatorischer Strategien wurde zunaechst ein sehr aktiver und stabiler Katalysator im ternaeren Cu-Ni-Zn-System entdeckt. Metal recovery via geobiotechnology; Metallgewinnung mittels Geobiotechnologie. Fachbereich Geochemie der Rohstoffe. Specialized acidophilic bacteria and archaea are able to extract valuable metals such as copper, gold, cobalt, nickel, zinc, and uranium from sulfide ores.

This process is known as bioleaching and its application in the mining industry as biomining. Laboratory studies also demonstrated bioleaching of oxide ores such as laterites and of mining residues such as mine tailings as well as metal recycling from waste secondary mining. Metals being leached have to be recovered from acidic polymetallic solutions mine and process waters which is possible via biosorption or biomineralisation.

Many processes in chemistry can be enhanced by ultrasound assistance. In many cases ultrasound induced cavitation is the main reason for these enhancements. Therefore, it is desired to quantify cavitation activity during the process to optimize sonication for various processes and monitor cavitation activity throughout the process. One possibility to monitor cavitation activity is to measure the acoustic emissions of oscillating and collapsing cavitation bubbles by hydrophones in the liquid.

Klinik und Poliklinik fuer Nuklearmedizin; Cordes, U. Medizinische Klinik und Poliklinik; Bartelt, K. Klinik und Poliklinik fuer Nuklearmedizin; Hey, O. Neurochirurgische Klinik und Poliklinik; Beyer, J. Medizinische Klinik und Poliklinik; Bockisch, A. Klinik und Poliklinik fuer Nuklearmedizin.

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The aim of our prospective study was to optimize the determination of the pituitary somatostatin receptor status by means of In-pentetreotide scintigraphy and to compare it intraindividually with the pharmacological effect of octreotide in active acromegaly. As often the normal pituitary gland can be visualized scintigraphically, the purely visual differentiation between a normal and pathological receptor status sometimes is equivocal.

A pituitary uptake index, calculated by means of a standardized ROI technique, facilitates this discrimination and so contributes to select possible responders for a treatment with octreotide. Ziel unserer prospektiven Studie war die optimierte Bestimmung des hypophysaeren Somatostatin-Rezeptorstatus in der In-Pentetreotid-Szintigraphie und der intraindividuelle Vergleich mit dem pharmakologischen Effekt von Octreotid bei florider Akromegalie. Engineering geological and hydrogeological invstigations for storage of medium and low-activity nuclear waste at Cernavoda, Romania.

Lehrstuhl fuer Angewandte Geologie. This studies and measures are shortly analyzed and discussed in this paper. Ein Vergleich zu konventioneller Diagnostik. Aim of the present retrospective study was to validate the clinical value of FFDG PET imaging in lymphoma patients with a dual head camera modified for coincidence detection.

Staging before and after oncological treatment was compared with a conservative diagnostic approach. Pretherapeutic staging was realized in 28 patients, 9 of them had control studies after they had completed therapy. Totally 29 persons were examined for posttherapeutic restaging. Computed tomography imaging and lymph node sonography was performed in all cases. Results were validated by clinical follow-up, in three cases a recidive was proven by biopsy. FDG Hybrid-PET is as or even more accurate than standard morphologic diagnostic methods for prestaging in malignant lymphoma.

Die Ergebnisse von prae- und post-therapeutischem Staging wurden mit dem konservativ bildgebender Verfahren verglichen. Ein praetherapeutisches Staging wurde bei 28 Patienten durchgefuehrt, 9 von diesen hatten weitere Kontrollstudien nach abgeschlossenem. Determination of left ventricular heart volume by fast MRI in breath-hold technique: Wie unterschiedlich sind quantitativer Herzkatheter, quantitativer MRT und visuelle Echokardiographie?

Projektgruppe Magnetresonanztomographie; Pabst, W. Projektgruppe Magnetresonanztomographie; Dinkel, H. Fuer Therapieentscheidung und Verlaufskontrolle sollten die Methoden nicht bedenkenlos ausgetauscht werden. Diagnosis of cerebral metastases by means of standard doses of Gadobutrol versus a high-dose protocol. Intraindividual evaluation of a phase-II high-dose study; Zerebrale Metastasendiagnostik mittels Standarddosis Gadobutrol vs. Berlin Germany ; Friebe, C.

Berlin Germany ; Balzer, T. Berlin Germany ; Steiner, S. Berlin Germany ; Schedel, H. Berlin Germany ; Pegios, W. Berlin Germany ; Lanksch, W. Berlin Germany ; Banzer, D. In a clinical phase-II study 20 patients who had been diagnosed as having brain metastases with CT or MRT were studied prospectively with Gadobutrol, a new nonionic, low osmolality contrast agent. Each patient received an initial injection of 0.

Spinecho images were obtained before and after the two applications of Gadobutrol. Both quantitative and qualitative data were intraindividually evaluated. The primary tumor was a bronchial carcinoma in 11 cases; in 9 other cases there were different primary tumors. Forty-eight hours after the use of Gadobutrol there were no adverse signs in the clinical examination, vital signs or blood and urine chemistry. Qualitative delineation and contrast of the lesions increased significantly. The use of high-dose Gadobutrol improved the detection of 36 additional lesions in 6 patients.

Die klinischen und laborchemischen Untersuchungen. Studienjahr des Modellstudiengangs HannibaL: An evaluation study based on students' self-assessments. Regarding methods, the deployed simulated patients per student-course group in 3 of the 7 course sessions, respectively were rated the most helpful. The present evaluation calls for both further development of the doctor-patient communication curriculum at the MHH and joint activities across medical schools, which are discussed at the end of the paper. Investigations on avoidance of hot cracks during laser welding of austenitic Cr-Ni steels and nickel-based alloys using temperature field tailoring.

Zweitens wird bei rotationssymmetrischen Bauteilen, die mittels einer Axial-Rundnaht zu verschweissen sind, mit einem relativ einfachen Temperaturfeld, das durch Erwaermung des innen liegenden Fuegepartners vor und waehrend des Schweissens aufgebaut wird, ein Spannungsfeld erzeugt, das die Bildung von Heissrissen verhindert.

Schliesslich konnte drittens ein heissrissfreies Laserstrahlschweissen des Stahls 1. Die zur Vermeidung dieser Risse noetigen Druckspannungen in den Richtungen parallel zur Schweissnaht bzw. Ebenso stoesst das Verfahren an seine Grenzen, wenn Wiederaufschmelzungsrisse auftreten, was beim hier verwendeten Stahl 1. Die Spannungen, die zur Verhinderung einer Rissoeffnung an den Korngrenzen der Waermeeinflusszone erforderlich waeren, konnten durch Temperaturfeld-Tailoring nicht erreicht werden.

Die Moeglichkeit des heissrissfreien Schweissens des Stahls 1. Ein industrieller Einsatz des Laserstrahlschweissens fuer diesen oft als nicht schweissbar klassifizierten Stahl erscheint moeglich, wenn bei der Legierungszusammensetzung auf niedrige Anteile der Austenitbildner Nickel, Kohlenstoff und Stickstoff Wert gelegt wird und damit eine stabil primaer ferritische Erstarrung erreicht wird.

Fuer diesen Fall kommt es nicht zur Schwefelanreicherung an den Korngrenzen, wodurch die Bildung niedrigschmelzender Phasen und damit die Heissrissentstehung. Radiological diagnostics in the clinical context; Pulmonale Hypertonie. Radiologische Diagnostik im klinischen Kontext. Pulmonary hypertension PH has a broad differential and the radiological task is to define and characterize the pathophysiological background.

The first part of the review is focused on the clinical categorization and specific features of the various groups of PH. Overall, PH is a rare disease and the clinical symptoms are non specific. Therefore, the disease is usually detected delayed. Each radiological technique, especially chest X-ray and CT, do show specific findings suggestive of PH, which will be discussed. Verification of the severity of PH is still a domain of invasive right heart catheterization. However, there are promising approaches using MRI to determine the pulmonary arterial pressure non-invasively.

Treatment of malignant biliary occlusion by means of transhepatic percutaneous biliary drainage with insertion of metal stents - results of an 8-year follow-up and analysis of the prognostic parameters; Behandlung der malignen Gallenwegsstenose mittels perkutaner transhepatischer Metallendoprothesenimplantation: In einer retrolektiven Analyse wurden Patienten evaluiert. Nachsorgedaten wurden anhand der Krankenakten und eines Telephoninterviews erhoben.

Verfahrensassoziierte Daten waren prospektiv in einer Datenbank erhoben worden. Praediktive Faktoren fuer das Ueberleben und die Tages-Mortalitaet wurden durch eine schrittweise logistische Regression evaluiert. Die primaere Stentoffenheitsrate Tage, Median unterschied sich nicht signifikant fuer die verschiedenen Tumorentitaeten.

Die multiple Regressionsanalyse detektierte keine praediktiven Faktoren fuer das Ueberleben und die Tages-Mortalitaet. Die perkutane transhepatische Metallendoprothesenimplantation bietet den Patienten eine gute kurz- und langfristige palliative Therapie des Ikterus an.

Obwohl die Ueberlebenszeit fuer Patienten mit Cholangiokarzinomen signifikant laenger ist, fehlen klare praediktive Faktoren fuer ein laengeres Ueberleben und eine erhoehte Tages-Mortalitaet. Decarbonization by means of hydrogen; Dekarbonisierung mittels Wasserstoff. Research in Energy and Electronics, Corporate Technology. With the help of regeneratively generated electricity, it converts water into its constituents hydrogen and oxygen without producing carbon dioxide.

Experts are working on the still young PEM technology, which is particularly efficient and environmentally friendly. The holistic optimization of the plant plays an important role. Mit Hilfe regenerativ erzeugtem Strom wandelt sie Wasser in seine Bestandteile Wasserstoff und Sauerstoff um, ohne dass dabei Kohlenstoffdioxid entsteht. Experten arbeiten an der noch jungen PEM-Technologie, die besonders effizient und umweltvertraeglich ist. Eine wichtige Bedeutung hat dabei die ganzheitliche Optimierung der Anlage. Sliding bearing diagnosis with magnetic field measuring; Gleitlagerdiagnose mittels Magnetfeldmessungen.

Account of their properties sliding bearings are in high demanded and important aggregats.

The destruction of a bearing will be almost followed by the destruction of the aggregate. Various methods are existing for sliding bearing diagnosis. This methods often not permit the condition recognition. A new electromagnetical method will be developed. This method permits the condition recognition during working time of the aggregate. It also permits the recognition of wear. The method bases on a measuring of leak current over measuring the generated magnetic fields with Rogowski-coils. Die Zerstoerung eines Gleitlagers fuehrt meist auch zur Zerstoerung des gefuehrten Aggregats.

Zur Gleitlagerdiagnose existiert eine Reihe Verfahren. Ihnen wird ein elektromagnetisches Verfahren gegenuebergestellt. Damit koennen Gleitlagerzustaende waehrend des Aggregatebetriebs identifiziert werden. Das Verfahren erlaubt gleichermassen die Bestimmung des Lagerverschleisses.

Es basiert auf der Ableitstrommessung, bei der sich ausbildende Magnetfelder durch Rogowskispulen ausgemessen werden. Oberflaechenverbesserung im 3D-Druck mittels hoeherer Aufloesung. Dass das auch anders geht zeigt der vorliegende Artikel. Investigation of the local fracture toughness and the elastic-plastic fracture behavior of NiAl and tungsten by means of micro-cantilever tests; Untersuchung der lokalen Bruchzaehigkeit und des elastisch-plastischen Bruchverhaltens von NiAl und Wolfram mittels Mikrobiegebalkenversuchen.

This is linked to the thermally activated dislocation mobility which is more constrained in those samples. Investigations on plastically predeformed samples were performed in order to study the influence of the dislocation density on the fracture behavior. It was found that the fracture toughness was again not affected but that the predeformed samples failed at an earlier stage at lower J-integrals. This is due to the lower mobility of the dislocations emitted from the crack tip in consequence of the high amount of strain hardening and the higher flow stress in those samples.

Experiments in ultrafine-grained tungsten revealed a fracture behavior which was more brittle than expected. A single grain at the crack front with its crystallographic orientation being prone to cleavage failure can decisively influence the fracture behavior at the micro scale. Diese beiden Materialien besitzen charakteristische Sproed-Duktil-Uebergange, die oberhalb der Raumtemperatur liegen. Dies erlaubte es, Bruchvorgaenge, welche von begrenzter plastischer Verformung um die Rissspitze begleitet werden, auf der Mikroskala zu untersuchen.

Neue Methoden zur Beschreibung und Bestimmung des lokalen elastisch-plastischen Bruchverhaltens bzw. Dies ermoeglichte eine praezise Analyse des fuer die Bruchzaehigkeit charakteristischen Uebergangs von Rissabstumpfung zu stabilem Rissfortschritt. Die Versuche an einkristallinem NiAl fuer die beiden untersuchten Risssysteme der harten und weichen Orientierung.

Lung cancer staging according to the TNM system is based on morphological assessment of the primary cancer, lymph nodes and metastases. All aspects of this important oncological classification are measurable with MRI. Pulmonary nodules can be detected at the clinically relevant size of mm in diameter. The extent of mediastinal, hilar and supraclavicular lymph node affection can be assessed at the same time. The predominant metastatic spread to the adrenal glands and spine can be detected in coronal orientation during dedicated MRI of the lungs.

Search focused whole body MRI completes the staging. Various additional MR imaging techniques provide further functional and clinically relevant information during a single examination. In the oncological context the most important techniques are imaging of perfusion and tumor motion.

Functional MRI of the lungs complements the pure staging and improves surgical approaches and radiotherapy planning. Pulmonale Rundherde sind ab der klinisch relevanten Groesse von mm Durchmesser sicher erkennbar. Die Groesse der mediastinalen, hilaeren und supraklavikulaeren Lymphknoten kann in einem Untersuchungsgang bestimmt werden. Die MRT bietet vielfaeltige Moeglichkeiten, zusaetzliche funktionelle, klinisch relevante Informationen innerhalb einer Untersuchung zu erheben.

Im onkologischen Kontext sind die Perfusionsbildgebung der Lunge und die Bewegungsabschaetzung der Tumoren am bedeutendsten. Die funktionelle MRT der. Anesthetic and Radiologic Considerations and Management. Ethanol is an effective ablative agent used for the treatment of certain solid organ tumors and vascular malformations VMs.

The egress of ethanol beyond the target tissue can be associated with significant changes to the cardiopulmonary system that can lead to cardiac arrest. This article reviews the contemporary role of ethanol in tumor and VM treatment and discusses the physiological mechanisms of acute pulmonary hypertension and cardiovascular collapse. The importance of periprocedural recognition of the hemodynamic changes that can occur with the use of ethanol and the treatment of this condition are discussed.

Increased IgD milk antibody responses in a patient with Down's syndrome, pulmonary hemosiderosis and cor pulmonale. IgD antibody responses to cow's milk were investigated in a two-year-old black boy with evidence of pulmonary hemosiderosis and pulmonary hypertension.

Initially a broad spectrum of immunologic responses to cow's milk were observed including IgD, IgE, and precipitin antibodies. Specific IgD antibody responses to cow's milk could be modulated in terms of challenge or elimination and correlated with the clinical course. It is possible that IgD antibodies may be important in milk-related pulmonary hemosiderosis. Full Text Available Participants in university courses have different types of education and knowledge. In this case the didactic principle of differentiation is very important.

We present the Analyzed Classroom teaching concept using an IT-system for analyze the learning progress. Students use tablets working on their exercises. The system creates a documented assessment of competence level for each student. The teacher can use the results for planning next steps into current exercise.

Solar photocatalytic cleaning of polluted water. Solare Reinigung verschmutzter Waesser mittels Photokatalyse. Alternatively to biological, physical and chemical methods of waste water cleaning, photocatalysis can be employed. In this residue-free method, titanium dioxide particles are brought into contact with polluted water as photocatalysts.

Under UV irradiation at wave-lengths below nm, change carriers are generated in the semiconductor particles that act so intensely oxidizing as to completely degrade almost all organic pollutants in waste water. In this process, the ultra-violet part of the solar spectrum can be harnessed to generate oxidation equivalents. Thus, solar photocatalytic waste water cleaning is excellently suited for developing countries. Depths of controlled drillings by means of underground drives; Teufen von gesteuerten Bohrungen mittels Untertageantrieben. Today, the most modern directional drilling technology not only is used in case of very deep drillings deeper or longer than 2, meter by means of deep-level drilling rigs, but also with small, highly mobile universal drilling rigs.

Thus, drilling costs are reduced, and unconventional hydrocarbons methane gas - oil shale and shale gas deposits are explores economically. Furthermore, known near-surface petroleum deposits in Northern Germany as well as in other parts of the Earth such as in Romania, the U. Furthermore, today it is possible to investigate with controlled drillings more economically and with more safe sites for a possibly final storage of highly radioactive wastes. Controlled drillings may give an answer to geotechnical questions on highly inaccessible on optimum points for drilling wells in order to plan underground cavities or to investigate tunnel axes geotechnical or hydrological.

In this thesis, first, single gold nanoparticles of various sizes deposited on such an LED were investigated. A clear enhancement is detected as long as the dipole plasmon resonance of the particle is at a shorter wavelength than the LED emission. If the plasmon resonance coincides with the LED emission or is at a larger wavelength, the enhancement turns into suppression. Numerical simulations indicate that this latter effect is mainly caused by the particle quadrupole resonance producing extra absorption.

Arrays of MNPs can be produced by a special mask technique called ''Fischer pattern nanolithography'' and manipulated in shape and size by additional steps. After transformation of the particles to spheres, a clear enhancement was detected. Light that would otherwise remain trapped inside the substrate is coupled out by resonant plasmonic scattering. Investigations on analogous structures on a transparent high-index material GaP indicate a stronger coupling between the particles than expected on the basis of literature data.

AA - Philosophy ; Religion.

Mein Besuch beim Hals-Nasen-Ohren-Arzt

Dabei ist in drei Gruppen der Funktionalisierung zu unterscheiden: Engineering failure assessment methods applied to pressurized components; Bruchmechanische Bewertung druckfuehrender Komponenten mittels ingenieurmaessiger Bewertungsverfahren. The paper presents the two methods, explaining their advantages and shortcomes as well as common features. Their applicability is shown by experiments with two pressure vessels subject to internal pressure and flawed by a surface crack or a through-wall crack, respectively.

Both the R6 Routine and the ETM results have been compared with results of component tests carried out in the s at TWI and are found to yield acceptable conservative, i. In der vorliegenden Arbeit wurden beide Methoden vorgestellt, wobei ihre Vor- und Nachteile, aber auch ihre Gemeinsamkeiten herausgearbeitet wurden. Die Anwendung wurde an zwei innendruckbelasteten Behaeltern mit Oberflaechen- bzw.

The visualization of pannus in rheumatoid arthritis using NMR imaging. Pannusdarstellung bei rheumatoider Arthritis mittels Kernspintomographie. Ulm Germany ; Bader, C. Ulm Germany ; Goldmann, A. Ulm Germany ; Friedrich, J. The knee joints of 15 patients afflicted with rheumatoid arthritis were investigated using the method of nmr imaging. Parameters of investigation were the spin-echo and fast-field-echo sequences as well as the MR signal behaviour of proliferative synovial changes following intravenous administration of gadolinium dtpa.

Pannus having formed on the articular surfaces or beneath the articular cartilages was distinguishable from other changes on the basis of the increased signal intensities to be observed after gadolinium dtpa had been given. Untersuchungen zur oxidativen Bildung von Stickstoffmonoxid in Pflanzen sowie zur Visualisierung von Stickstoffmonoxid mittels Fluoreszenzfarbstoffen. Automation of the driving using the dynamic programming; Automatisierung des Treibens mittels diskreter dynamischer Programmierung.

Driving is a metal forming process throughout hammering in cold state. It can create almost any 2D and 3D metal sheets using universal tools. During driving, many parameters of the tools and the sheets affect the forming process, which inhibits a complete automation. In this paper, a model based control for a 2D driving process is proposed. The process of stretching L-shaped metal sheets is analytically modelled. Three phases, namely hybrid deformations, material flow as well as springback and inverse bending, describe the deformation process at one stroke.

This results in a nonlinear non-affine , time-discrete state space model. A model predictive controller MPC is then designed to determine the optimal control inputs at every time step. Thereby, an objective function that describes the costs from a start angle to an end condition is minimized by means of discrete dynamic programming DDP. Unfortunately, such methods are often knowledge-based and thus restricted to extensively annotated texts, which are not available to a sufficient extent for ancient Greek. In this article, we describe an approach that is based on the distributional hypotheses instead, to overcome the problem of missing annotations.

Despite its experimental state, the method produces some meaningful results as shown in three examples. Enforcement of mandatory third party access based on antitrust law; Zwangsdurchleitung mittels Kartellrecht. Access of third parties to power transmission systems which up to now is governed in Germany by ownership rights will not run smoothly in future, although the general policy decision ended the dispute about the if, however leaving open aspects of the how. The problems arising in designing the how are currently displayed to the public by the disputes about conditions and model solutions reported from the telecommunications area, where deregulation is ahead of the developments in the energy sector.

Obviously, the contention point is not technical feasibility of third party access, but the economic aspects and the conditions offered to competing suppliers depending on access to a transmission network. Hence it can be expected that there will be conflicts of interest that will have to be decided. The legal basis for conflict management is outlined in the recent amendment to the EnWG German energy industry act , and jurisdiction will primarily rely on paragraph 6 of the act, referring to antitrust review. The contribution here gives an outline of the legal framework conditions governing enforcement of third party access to transmission systems in the future deregulated energy market.

Dies wird zur Zeit dem deutschen Publikum im Bereich der Telekommunikation mit fast taeglich neuen Varianten vorgefuehrt. Es geht dabei offensichtlich nicht um die technische Machbarkeit der Drittnutzung, sondern um die wirtschaftlichen Konditionen fuer Konkurrenten, die fuer ihr Leistungsangebot auf den Zugang zum Netz angewiesen sind. Konflikte ueber die Bedingungen dieses Zugangs sind daher vorprogrammiert, und es stellt sich die Frage, nach welchen Regeln und durch welche Gremien oder Institutionen solche Konflikte entschieden werden sollen.

Investigation of relativistic laser-plasmas using nuclear diagnostics; Untersuchung relativistischer Laserplasmen mittels nukleardiagnostischer Verfahren. The present work explores with the development of a novel nuclear diagnostic method for the investigation of the electron dynamics in relativistic laser-plasma interactions. An additional aim of this work was the determination of the real laser peak intensity via the interaction of an intense laser short-pulse with a solid target.

The nuclear diagnostics is based on a photo-neutron disintegration nuclear activation method. The main constituent of the nuclear diagnostic are novel pseudoalloic activation targets as a kind of calorimeter to measure the high-energy bremsstrahlung produced by relativistic electrons.

The activated nuclides were identified via the characteristic gamma-ray decay spectrum by using high-resolution gamma spectroscopy after the laser irradiation. The high-energy bremsstrahlung spectrum has been deconvolved using a novel analysis method based on a modified Penfold-Leiss method. This facilitates the reconstruction of the spectrum of bremsstrahlung photons without any anticipated fit procedures. Furthermore, the characterization of the corresponding bremsstrahlung electrons in the interaction zone is accessible immediately. The consolidated findings about the properties of the relativistic electrons were used to determine the real peak intensity at the laser-plasma interaction zone.

In the context of this work, experiments were performed at three different laser facilities. The results obtained with the novel nuclear diagnostics method have lead to an advanced understanding of high-energy electrons produced in relativistic laser-plasma interactions. Particularly, the capability of the nuclear activation-based method to determine the real laser peak intensity at the relativistic laser-plasma interaction zone was demonstrated.

Results of ultrasonic disintegration of sewage sludge in practice; Ergebnisse des Praxiseinsatzes der Schlammdesintegration mittels Ultraschall. Using high-performance ultrasonic sludge disintegration in different stages of sewage and sludge treatment is found to be an innovative approach for reducing the accruing amounts of sewage sludge in terms of both mass and volume. By means of practical tests with sludge disintegration at sewage treatment plants, its effects are demonstrated.

An Hand von Einsatzerprobungen der Desintegration in der Klaeranlagenpraxis werden die Effekte der Desintegration vorgestellt. Preoperative staging with magnetic resonance imaging; Zervixkarzinom. Praeoperatives Staging mittels Magnetresonanztomographie. The treatment of uterine cervical carcinoma is largely dependent on the tumor stage. Despite significant inaccuracies in the clinical examination, uterine cervical cancer remains the only gynecological form of cancer still largely staged according to clinical findings. Although imaging is still not included in the staging the recently published revised FIGO Federation International de Gynecologie et d'Obstetrique system encourages the use of modern cross-sectional imaging magnetic resonance imaging MRI and computed tomography CT.

Due to its high soft tissue contrast MRI allows excellent non-invasive assessment of the cervix with direct tumor delineation as well as assessment of the prognosis based on morphological factors. Therefore MRI is considered to be the optimal modality for diagnostic evaluation starting from FIGO stage IB1, for radiation therapy planning, and for exclusion of recurrence in follow-up.

In this paper we give an overview of the role of magnetic resonance imaging in preoperative staging of uterine cervical cancer. Die MRT ermoeglicht dank ihres hohen Weichteilkontrasts ein ausgezeichnetes nichtinvasives Staging des Zervixkarzinoms mit direkter Tumordarstellung sowie einer Prognoseabschaetzung anhand bildmorphologischer Faktoren. This final report for the Swiss Federal Office of Energy SFOE takes a look at methods of supplying small equipment such as Internet telephones, web cams, hubs, hard discs, audio equipment, point-of-sale terminals, game consoles etc.

Product details File Size: Springer June 18, Publication Date: June 18, Language: Share your thoughts with other customers. Write a customer review. Amazon Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers. Learn more about Amazon Giveaway. Set up a giveaway. There's a problem loading this menu right now.

Learn more about Amazon Prime. Get fast, free shipping with Amazon Prime. Get to Know Us. A narrow contrast-enhanced zone was seen on the tumor border subcutaneously as a sign of peripheral hyperemia and central vascular stasis after cryotherapy. On histology there was evidence of both apoptosis and necrosis. Erheben des histopathologischen Befundes der Kryolaesion nach definierten Zeitintervallen und Ueberpruefung einer moeglichen Rolle der Apoptose nach Kryotherapie. Darstellung morphologischer Veraenderungen des Tumors und des angrenzenden Gewebes im Anschluss an die Kryotherapie mittels kontrastmittelunterstuetzter MRT.

Zweiminuetige Kryotherapie subkutan implantierter Tumoren eines nicht-kleinzelligen Bronchialkarzinoms. Mediastinal fibrosis with pulmonary artery obstruction; diagnosis and investigation with helical CT imaging including 3-dimensional reconstructions; Pulomonalarterienstenose bei aggresiver Mediastinalfibrose; Diagnostik und 3D-Darstellung mittels helikaler CT-Untersuchung. An aggressive mediastinal fibrosis was found in a year-old female, suffering from dysphagia, stabbing pain in the chest, and an unclear weight loss.

In this case, the rare combination of esophageal involvement, bronchial narrowing, and pulmonary artery obstruction could easily be demonstrated with a barium study and a helical CT examination including three-dimensional reconstructions. Mittels klinischer und radiologischer Abklaerung konnte eine aggressive Mediastinalfibrose diagnostiziert werden. Die seltene Kombination einer Oesophaguseinengung mit Pulmonalarterienstenosen sowie einer Bronchuskompression konnte nichtinvasiv mittels Oesophagogramm und helikaler CT-Untersuchung zuverlaessig und schnell dargestellt werden.

Assessment of the right ventricular function in patients with chronic obstructive pulmonary disease and cor pulmonale using cardiac slice spiral CT comparing with 1. Twenty age-matched subjects were included as the controls. AP value of less than 0. The RVEF was The MM was The EDV was Due to the increased survival of patients with pulmonary hypertension, even non-cardiac anesthesiologists will see these patients more frequently for anesthesia.

The hemodynamic goal in the perioperative period is to avoid an increase in pulmonary vascular resistance PVR and to reduce a possibly. Operation planning for a pondage power station chain by means of linear programming and genetic optimisation; Einsatzplanung fuer eine Flusskraftwerkskette im Schwellbetrieb mittels LP und genetischer Optimierung. This paper presents a system package which serves as a simulation and optimisation tool for daily operation planning for a hydroelectric cascade.

The purpose of the planning is to maximise the differentially weighted production of electrical energy given a certain set of specifications and secondary conditions. Optimal operation management is achieved using a two-stage approach: Ziel der Wasserbewirtschaftung ist es, unter den gegebenen Vorgaben und Randbedingungen die bewertete Erzeugung elektrischer Energie zu maximieren. Das optimale Fahrplanmanagement wird durch einen zweistufigen Loesungsansatz realisiert: Mit einer Vor-Optimierung mittels Linearer Programmierung LP , gefolgt von einer detaillierten Optimierung mit einem Genetischen Algorithmus, der auf ein nichtlineares, dynamisches Simulationsmodell fuer die Kette aus Kraftwerken und Stauraeumen zugreift.

Measurement of the filling height of transient two-phase surge flows in pipelines by means of electronics; Messung der Fuellhoehe von transienten Zweiphasenschwallstroemungen in Rohrleitungen mittels Ultraschall. The aim of the ultrasonic measurements was the determination of the time course of the level of a transient surge flow with swirl and waves in partly filled roughly horizontally laid pipelines. The running time of the ultrasonic waves from the test head to the liquid surface and back was measured for this purpose.

The course of the stress was recorded digitally and was evaluated with the aid of software. Waves, swirl, turbulence of flow and introduced test bodies in the flow caused typical echoes, which had to be taken into account in the evaluation. As the test head was fitted on the outside of the pipe clamp-on technique , the pipe wall thickness and the speed of sound in the pipe wall had to be included in the calculation of filling height by means of a correction.

Hierzu wurde die Laufzeit der Ultraschallwellen vom Pruefkopf zur Fluessigkeitsoberflaeche und zurueck gemessen.


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Die Laufzeit der Ultraschallwellen wurde auf eine quasi-analog elektrische Spannung abgebildet. Der Spannungsverlauf wurde digital aufgezeichnet und softwaregestuetzt ausgewertet. Wellen, Drall, Stroemungsturbulenzen sowie eingebrachte Pruefkoerper in der Stroemung hatten typische Echoerscheinungen zur Folge, die bei der Auswertung zu beruecksichtigen waren. Da der Pruefkopf aussen am Rohr angebracht war clamp-on-Technik , musste die Rohrwandstaerke und die Schallgeschwindigkeit in der Rohrwandung mittels eines Korrekturgliedes in die Fuellhoehenberechnung eingezogen werden.

C-arm computed tomography for transarterial chemoperfusion and chemo-embolization of thoracic lesions; Transarterielle Chemoperfusion und -embolisation thorakaler Neoplasmen mittels C-Arm CT. From September to March a total of 31 patients 20 males and 11 females, average age: C-arm CT of the latest generation was used to localize the lesion before local chemotherapy Artis Zeego, Siemens, Erlangen. For TACP a rotation and a volume of ml ratio of 1: For TPCE a volume of 75 ml ratio of 1: C-arm CT provides additional information on the vascular characteristics and perfusion of pulmonary lesions resulting in a change of interventional strategy in a relevant number of patients.

Alle Behandlungen erfolgten an einem C. Muenchen Germany ; Kersting, S. Functional computed tomography for visualization and quantification of subchondral bone mineralization using CT osteoabsorptiometry CT-OAM. Subchondral bone pixels were segmented and assigned to 10 density value groups triangle HU, range - HU the pixels using volume rendering technique VRT. The data analysis considered the severity of HV as determined by the radiographically measured HV-angle a.

The bone density localization enables the assignment to different groups, showing a characteristic HV-angle-dependent distribution of the maximum bone mineralization of the load-dependent densitogram p mittels funktioneller Computertomographie als CT-Osteoabsorptiometrie CT-OAM. Mittel - und Osteuropa oder: Middle and Eastern Europe or: This anthology, the result of a conference organized in September by the Institute for Slavonic studies at the University of Innsbruck in co-operation with the Austrian UNESCO commission, examines various aspects of the institutionalization and representation of women in Middle and Eastern European culture from a sociological and cultural historical perspective and from that of literary and film sciences.

Vorrichtung zur Thermokoagulation mittels Laserstrahlung. The apparatus has diode lasers 2,4 which emit laser radiation with different central wavelength. The laser radiations from diode lasers are superimposed with each other. A control device 12 is provided for controlling laser power of diode laser. The thermal coagulation process is performed with respect to simultaneous emission of laser radiation from diode laser in processing mode.

Muenchen Germany ; Rossmueller, B. Muenchen Germany ; Hahn, K. Muenchen Germany ; Inst. Die Berechnung der Partialfunktion ausschliesslich aus den dorsalen Projektionen fuehrt im Vgl. Dieser Effekt fuehrt jedoch bei orthotop. Reduction of radiation dose by using digital luminescence radiography compared to conventional screen film system with grid cassette; Reduktion der Strahlendosis mittels Speicherfolienradiographie im Vergleich zum konventionellen Film-Folien-System mit Rasterkassette am Schaedelphantom.

Bei konstanter Spannung wurde das mAs-Produkt stufenweise gesenkt und dabei die Eintrittsdosis mittels Halbleiterdetektor des Dosimax Wellhoefer ermittelt. Der Bildkontrast war sehr gut bis ausreichend. Die Akzeptanz der nachverarbeiteten Aufnahmen war individuell verschieden und erbrachte nur in hoeheren Dosisbereichen eine verbesserte Beurteilbarkeit der Knochenstrukturen und des Kontrastes. Mittels digitaler Radiografie wird damit bei 73 kV ein fragestellungsbezogenes mAs-Produkt moeglich und angegeben, so z.

Assessment of hemodynamic changes in patients with renal artery stenosis by means of the cine MR phase-contrast technique; Einstufung haemodynamischer Veraenderungen bei Nierenarterienstenosen mittels MR-Cine-Phasenkontrastflussmessungen. Sektion Gefaesschirurgie; Just, A. To evaluate the use of high-temporal resolution cine MR phase-contrast flow measurements for assessment of flow dynamics in renal artery stenosis RAS. In a dog model, cine MR flow measurements were validated by comparing the MR flow data to an invasive transit-time ultrasound reference technique for different degrees of RAS.

Cardiac-gated MR flow curves were recorded in 56 renal arteries of 28 patients with a temporal resolution of at least 32 ms. Abnormalities of flow dynamics were assessed in the calculated flow curves using the MR parameters mean flow, maximum velocity, and time to systolic maximum. Analysis of cardiac-gated MR flow curves provides a non-invasive method to assess the hemodynamic significance of RAS and thus allows a functional evaluation in relation to the morphologic characteristics of the stenosis.

In einem Hundemodell wurde die Cine-MR-Flussmessung validiert, indem fuer unterschiedliche Stenosegrade Vergleichsmessungen mit einer invasiven Transitzeit-Ultraschallreferenztechnik durchgefuehrt wurden. Alle Nierenarterienstenosen wurden mittels digitaler Subtraktionsangiographie gesichert. Experimental determination of the electronic properties of application-relevant interfaces of organic semiconductors by means of photoelectron spectroscopy; Experimentelle Bestimmung der elektronischen Eigenschaften anwendungsrelevanter Grenzflaechen organischer Halbleiter mittels Photoelektronenspektroskopie.

To the scientific study hereby came two types of application-relevant interfaces. On the one hand the influence of the electrode preparation under normal conditions by means of ex-situ purification procedures in comparison to in-situ prepared contacts on the electronic behaviour of the organic semiconductor sexithiophene on interfaces to metallic substrates was studied. As substrate materials hereby the metals silver, palladium, gold, and platinum came to application.

Also in the framework of these studies the influence of oxygen on the electronic and chemical behaviour on the interfaces held the spotlight. Zur wissenschaftlichen Untersuchung kamen hierbei zwei Typen anwendungsrelevanter Grenzflaechen. Zum einem wurde der Einfluss einer Elektrodenpraeparation unter Normalbedingungen mittels ex.

Pulmonale verdichtingen na een uterusextirpatie, door benigne metastatisch leiomyoom. A year-old woman, who had undergone a hysterectomy 17 years previously, was referred with thoracic pain located on the right side that had been present for several weeks. Thoracic imaging showed multiple pulmonary lesions on both sides. Histological investigation of a biopsy from one of these. Magnetic resonance imaging in pulmonary hypertension. Magnetresonanztomographie bei pulmonaler Hypertension.

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Universitaetsklinik fuer Kardiologie, Vienna Austria. We examined 23 patients with pulmonary hypertension of varying aetiology by MRI and compared the results with those of right heart catheterisation. Pulmonary arteriovenous malformations are congenital vascular malformations in the lungs, which act as shunts so that the blood is not oxygenated or filtered. These patients are typically hypoxaemic with exercise intolerance and are at high risk of paradoxical emboli to the brain.

Embolisation prevents cerebral stroke and abscess and pulmonary haemorrhage and further raises the functional level. Screening for pulmonary arteriovenous malformations in patients at risk is recommended A series of nine patients with pulmonary arteriovenous malformations PAVM treated with embolotherapy at Odense University Hospital is presented. In all patients the arterial oxygen tension increased after embolisation. PAVM causes right-to-left shunting, which may result in severe hypoxaemia, and Pulmonary manifestations from systemic vasculitides; Pulmonale Manifestationen bei systemischen Vaskulitiden.

Klinik fuer Internistische Rheumatologie und Klinische Immunologie. Pulmonary vasculitides predominantly involve the small arterioles, capillaries and venules and include Wegener's granulomatosis, microscopic polyangiitis and the Churg-Strauss syndrome. Takayasu's arteriitis is a large vessel disease and may affect the main pulmonary arteries causing stenoses and occlusions. Knowledge of the natural course of disease and of clinical manifestations of pulmonary disease is helpful for an understanding of imaging findings.

For this reason this article gives an overview not only of radiologic findings in chest X-ray and high resolution CT of the lungs but as well of clinical aspects of pulmonary vasculitides. Next to determination of disease extension the determination of disease activity is in the foreground of diagnostic imaging in vasculitides.

Within this context principals of immunosuppressive therapy will be recognized. Klinik fuer Radiologische Diagnostik. Prior to contrast injection, 10 mg of furosemide were administered intravenously. Secondary to the precontrast furosemide injection, the increase of the renal excretion rate allows complete visualisation of the entire collecting system within 10 minutes following Gd injection. Maximum intensity projections provide a three-dimensional overview of the ureters separate from the bladder. To achieve detailed anatomic imaging of the calices, both optimal distension and high resolution sequences are prerequisites which cannot be realized by means of survey urograms only.

Vor der Kontrastmittelgabe wurden jeweils 10 mg Furosemid intravenoes verabreicht. Nach initialer Steigerung des Harnflusses durch Furosemidgabe wurden Uebersichtsurogramme mit vollstaendig durchzeichnenden Ureteren bereits 10 min nach Gd-Injektion erzielt. Maximumintensitaetsprojektionen ermoeglichten die Beurteilung des dreidimensionalen Verlaufes der Ureteren ohne Blasenueberlagerung. Eine genauere anatomische Darstellung der Nierenkelche erforderte neben einem guten Fuellungszustand eine moeglichst hohe Sequenzaufloesung, die mit Uebersichtsurogrammen allein nicht zu erreichen war.

Development of new heterogeneous catalysts for the decomposition of methanol into hydrogen and carbon monoxide applying high throughput methods; Entwicklung neuer heterogener Katalysatoren zur Spaltung von Methanol in Wasserstoff und Kohlenmonoxid mittels Hochdurchsatz-Methoden. The topic of this thesis has been the development of new heterogeneous catalysts for the decomposition of methanol into hydrogen and carbon monoxide. As an important constraint here, the content of noble metals of the catalysts should be as low as possible.

High-throughput-methods were applied in some of the syntheses and experiments to accelerate the development, as, for example, the use of liquid based sol-gel syntheses and the examination of catalyst libraries by spatial resolution gas chromatography. This screening technique allowed to test up to different substances during one single experiment.

Then, different combinatorial strategies were applied. First, these methods led to a highly active and stable catalyst in the ternary system of Cu-Ni-Zn, which showed high conversion and selectivity comparable to an industrial reference catalyst. Its activity during an 18 hour long term run was constant in contrast to the reference.

Second, an additional approach starting from a broader variety of elements led to a Ce- Ru- and to a Cr-Ru-catalyst.

pulmonaler rundherde mittels: Topics by iwojafevazyx.ml

Both of them were highly active in short term experiments, but lost their outstanding performances during long term runs. Um diesen Prozess zu beschleunigen, wurden in einem Teil der Synthesen und Experimente Hochdurchsatzmethoden verwendet. Neben der Roboter gestuetzten Sol-Gel-Synthese umfasste dies die Untersuchung von Katalysatorbibliotheken mittels ortsaufgeloester Gaschromatographie, die es ermoeglichte, in einem Experiment bis zu verschiedene Substanzen auf ihre katalytische Aktivitaet zu testen.

Unter Anwendung verschiedener kombinatorischer Strategien wurde zunaechst ein sehr aktiver und stabiler Katalysator im ternaeren Cu-Ni-Zn-System entdeckt. Metal recovery via geobiotechnology; Metallgewinnung mittels Geobiotechnologie. Fachbereich Geochemie der Rohstoffe. Specialized acidophilic bacteria and archaea are able to extract valuable metals such as copper, gold, cobalt, nickel, zinc, and uranium from sulfide ores. This process is known as bioleaching and its application in the mining industry as biomining.

Laboratory studies also demonstrated bioleaching of oxide ores such as laterites and of mining residues such as mine tailings as well as metal recycling from waste secondary mining. Metals being leached have to be recovered from acidic polymetallic solutions mine and process waters which is possible via biosorption or biomineralisation. Many processes in chemistry can be enhanced by ultrasound assistance. In many cases ultrasound induced cavitation is the main reason for these enhancements. Therefore, it is desired to quantify cavitation activity during the process to optimize sonication for various processes and monitor cavitation activity throughout the process.

One possibility to monitor cavitation activity is to measure the acoustic emissions of oscillating and collapsing cavitation bubbles by hydrophones in the liquid. Klinik und Poliklinik fuer Nuklearmedizin; Cordes, U. Medizinische Klinik und Poliklinik; Bartelt, K. Klinik und Poliklinik fuer Nuklearmedizin; Hey, O. Neurochirurgische Klinik und Poliklinik; Beyer, J. Medizinische Klinik und Poliklinik; Bockisch, A.

Klinik und Poliklinik fuer Nuklearmedizin. The aim of our prospective study was to optimize the determination of the pituitary somatostatin receptor status by means of In-pentetreotide scintigraphy and to compare it intraindividually with the pharmacological effect of octreotide in active acromegaly. As often the normal pituitary gland can be visualized scintigraphically, the purely visual differentiation between a normal and pathological receptor status sometimes is equivocal.

A pituitary uptake index, calculated by means of a standardized ROI technique, facilitates this discrimination and so contributes to select possible responders for a treatment with octreotide. Ziel unserer prospektiven Studie war die optimierte Bestimmung des hypophysaeren Somatostatin-Rezeptorstatus in der In-Pentetreotid-Szintigraphie und der intraindividuelle Vergleich mit dem pharmakologischen Effekt von Octreotid bei florider Akromegalie.

Engineering geological and hydrogeological invstigations for storage of medium and low-activity nuclear waste at Cernavoda, Romania. Lehrstuhl fuer Angewandte Geologie. This studies and measures are shortly analyzed and discussed in this paper. Ein Vergleich zu konventioneller Diagnostik.

Aim of the present retrospective study was to validate the clinical value of FFDG PET imaging in lymphoma patients with a dual head camera modified for coincidence detection. Staging before and after oncological treatment was compared with a conservative diagnostic approach. Pretherapeutic staging was realized in 28 patients, 9 of them had control studies after they had completed therapy. Totally 29 persons were examined for posttherapeutic restaging. Computed tomography imaging and lymph node sonography was performed in all cases. Results were validated by clinical follow-up, in three cases a recidive was proven by biopsy.

FDG Hybrid-PET is as or even more accurate than standard morphologic diagnostic methods for prestaging in malignant lymphoma. Die Ergebnisse von prae- und post-therapeutischem Staging wurden mit dem konservativ bildgebender Verfahren verglichen. Ein praetherapeutisches Staging wurde bei 28 Patienten durchgefuehrt, 9 von diesen hatten weitere Kontrollstudien nach abgeschlossenem.

Determination of left ventricular heart volume by fast MRI in breath-hold technique: Wie unterschiedlich sind quantitativer Herzkatheter, quantitativer MRT und visuelle Echokardiographie? Projektgruppe Magnetresonanztomographie; Pabst, W. Projektgruppe Magnetresonanztomographie; Dinkel, H. Fuer Therapieentscheidung und Verlaufskontrolle sollten die Methoden nicht bedenkenlos ausgetauscht werden.

Diagnosis of cerebral metastases by means of standard doses of Gadobutrol versus a high-dose protocol. Intraindividual evaluation of a phase-II high-dose study; Zerebrale Metastasendiagnostik mittels Standarddosis Gadobutrol vs. Berlin Germany ; Friebe, C. Berlin Germany ; Balzer, T. Berlin Germany ; Steiner, S. Berlin Germany ; Schedel, H. Berlin Germany ; Pegios, W. Berlin Germany ; Lanksch, W. Berlin Germany ; Banzer, D.

In a clinical phase-II study 20 patients who had been diagnosed as having brain metastases with CT or MRT were studied prospectively with Gadobutrol, a new nonionic, low osmolality contrast agent. Each patient received an initial injection of 0. Spinecho images were obtained before and after the two applications of Gadobutrol. Both quantitative and qualitative data were intraindividually evaluated.

The primary tumor was a bronchial carcinoma in 11 cases; in 9 other cases there were different primary tumors. Forty-eight hours after the use of Gadobutrol there were no adverse signs in the clinical examination, vital signs or blood and urine chemistry. Qualitative delineation and contrast of the lesions increased significantly.

The use of high-dose Gadobutrol improved the detection of 36 additional lesions in 6 patients. Die klinischen und laborchemischen Untersuchungen. Studienjahr des Modellstudiengangs HannibaL: An evaluation study based on students' self-assessments. Regarding methods, the deployed simulated patients per student-course group in 3 of the 7 course sessions, respectively were rated the most helpful.

The present evaluation calls for both further development of the doctor-patient communication curriculum at the MHH and joint activities across medical schools, which are discussed at the end of the paper. Investigations on avoidance of hot cracks during laser welding of austenitic Cr-Ni steels and nickel-based alloys using temperature field tailoring. Zweitens wird bei rotationssymmetrischen Bauteilen, die mittels einer Axial-Rundnaht zu verschweissen sind, mit einem relativ einfachen Temperaturfeld, das durch Erwaermung des innen liegenden Fuegepartners vor und waehrend des Schweissens aufgebaut wird, ein Spannungsfeld erzeugt, das die Bildung von Heissrissen verhindert.

Schliesslich konnte drittens ein heissrissfreies Laserstrahlschweissen des Stahls 1. Die zur Vermeidung dieser Risse noetigen Druckspannungen in den Richtungen parallel zur Schweissnaht bzw. Ebenso stoesst das Verfahren an seine Grenzen, wenn Wiederaufschmelzungsrisse auftreten, was beim hier verwendeten Stahl 1. Die Spannungen, die zur Verhinderung einer Rissoeffnung an den Korngrenzen der Waermeeinflusszone erforderlich waeren, konnten durch Temperaturfeld-Tailoring nicht erreicht werden. Die Moeglichkeit des heissrissfreien Schweissens des Stahls 1.

Ein industrieller Einsatz des Laserstrahlschweissens fuer diesen oft als nicht schweissbar klassifizierten Stahl erscheint moeglich, wenn bei der Legierungszusammensetzung auf niedrige Anteile der Austenitbildner Nickel, Kohlenstoff und Stickstoff Wert gelegt wird und damit eine stabil primaer ferritische Erstarrung erreicht wird. Fuer diesen Fall kommt es nicht zur Schwefelanreicherung an den Korngrenzen, wodurch die Bildung niedrigschmelzender Phasen und damit die Heissrissentstehung. Radiological diagnostics in the clinical context; Pulmonale Hypertonie.

Radiologische Diagnostik im klinischen Kontext. Pulmonary hypertension PH has a broad differential and the radiological task is to define and characterize the pathophysiological background. The first part of the review is focused on the clinical categorization and specific features of the various groups of PH. Overall, PH is a rare disease and the clinical symptoms are non specific. Therefore, the disease is usually detected delayed. Each radiological technique, especially chest X-ray and CT, do show specific findings suggestive of PH, which will be discussed.

Verification of the severity of PH is still a domain of invasive right heart catheterization. However, there are promising approaches using MRI to determine the pulmonary arterial pressure non-invasively. Treatment of malignant biliary occlusion by means of transhepatic percutaneous biliary drainage with insertion of metal stents - results of an 8-year follow-up and analysis of the prognostic parameters; Behandlung der malignen Gallenwegsstenose mittels perkutaner transhepatischer Metallendoprothesenimplantation: In einer retrolektiven Analyse wurden Patienten evaluiert.

Nachsorgedaten wurden anhand der Krankenakten und eines Telephoninterviews erhoben. Verfahrensassoziierte Daten waren prospektiv in einer Datenbank erhoben worden. Praediktive Faktoren fuer das Ueberleben und die Tages-Mortalitaet wurden durch eine schrittweise logistische Regression evaluiert. Die primaere Stentoffenheitsrate Tage, Median unterschied sich nicht signifikant fuer die verschiedenen Tumorentitaeten. Die multiple Regressionsanalyse detektierte keine praediktiven Faktoren fuer das Ueberleben und die Tages-Mortalitaet.

Die perkutane transhepatische Metallendoprothesenimplantation bietet den Patienten eine gute kurz- und langfristige palliative Therapie des Ikterus an. Obwohl die Ueberlebenszeit fuer Patienten mit Cholangiokarzinomen signifikant laenger ist, fehlen klare praediktive Faktoren fuer ein laengeres Ueberleben und eine erhoehte Tages-Mortalitaet. Decarbonization by means of hydrogen; Dekarbonisierung mittels Wasserstoff. Research in Energy and Electronics, Corporate Technology.

With the help of regeneratively generated electricity, it converts water into its constituents hydrogen and oxygen without producing carbon dioxide. Experts are working on the still young PEM technology, which is particularly efficient and environmentally friendly. The holistic optimization of the plant plays an important role. Mit Hilfe regenerativ erzeugtem Strom wandelt sie Wasser in seine Bestandteile Wasserstoff und Sauerstoff um, ohne dass dabei Kohlenstoffdioxid entsteht. Experten arbeiten an der noch jungen PEM-Technologie, die besonders effizient und umweltvertraeglich ist.

Eine wichtige Bedeutung hat dabei die ganzheitliche Optimierung der Anlage. Sliding bearing diagnosis with magnetic field measuring; Gleitlagerdiagnose mittels Magnetfeldmessungen. Account of their properties sliding bearings are in high demanded and important aggregats. The destruction of a bearing will be almost followed by the destruction of the aggregate.

Various methods are existing for sliding bearing diagnosis. This methods often not permit the condition recognition. A new electromagnetical method will be developed. This method permits the condition recognition during working time of the aggregate. It also permits the recognition of wear.

The method bases on a measuring of leak current over measuring the generated magnetic fields with Rogowski-coils. Die Zerstoerung eines Gleitlagers fuehrt meist auch zur Zerstoerung des gefuehrten Aggregats. Zur Gleitlagerdiagnose existiert eine Reihe Verfahren. Ihnen wird ein elektromagnetisches Verfahren gegenuebergestellt.

Damit koennen Gleitlagerzustaende waehrend des Aggregatebetriebs identifiziert werden. Das Verfahren erlaubt gleichermassen die Bestimmung des Lagerverschleisses. Es basiert auf der Ableitstrommessung, bei der sich ausbildende Magnetfelder durch Rogowskispulen ausgemessen werden. Oberflaechenverbesserung im 3D-Druck mittels hoeherer Aufloesung.

Dass das auch anders geht zeigt der vorliegende Artikel. Investigation of the local fracture toughness and the elastic-plastic fracture behavior of NiAl and tungsten by means of micro-cantilever tests; Untersuchung der lokalen Bruchzaehigkeit und des elastisch-plastischen Bruchverhaltens von NiAl und Wolfram mittels Mikrobiegebalkenversuchen. This is linked to the thermally activated dislocation mobility which is more constrained in those samples. Investigations on plastically predeformed samples were performed in order to study the influence of the dislocation density on the fracture behavior.

It was found that the fracture toughness was again not affected but that the predeformed samples failed at an earlier stage at lower J-integrals. This is due to the lower mobility of the dislocations emitted from the crack tip in consequence of the high amount of strain hardening and the higher flow stress in those samples. Experiments in ultrafine-grained tungsten revealed a fracture behavior which was more brittle than expected.

A single grain at the crack front with its crystallographic orientation being prone to cleavage failure can decisively influence the fracture behavior at the micro scale. Diese beiden Materialien besitzen charakteristische Sproed-Duktil-Uebergange, die oberhalb der Raumtemperatur liegen. Dies erlaubte es, Bruchvorgaenge, welche von begrenzter plastischer Verformung um die Rissspitze begleitet werden, auf der Mikroskala zu untersuchen. Neue Methoden zur Beschreibung und Bestimmung des lokalen elastisch-plastischen Bruchverhaltens bzw. Dies ermoeglichte eine praezise Analyse des fuer die Bruchzaehigkeit charakteristischen Uebergangs von Rissabstumpfung zu stabilem Rissfortschritt.

Die Versuche an einkristallinem NiAl fuer die beiden untersuchten Risssysteme der harten und weichen Orientierung. Lung cancer staging according to the TNM system is based on morphological assessment of the primary cancer, lymph nodes and metastases. All aspects of this important oncological classification are measurable with MRI. Pulmonary nodules can be detected at the clinically relevant size of mm in diameter. The extent of mediastinal, hilar and supraclavicular lymph node affection can be assessed at the same time.

The predominant metastatic spread to the adrenal glands and spine can be detected in coronal orientation during dedicated MRI of the lungs. Search focused whole body MRI completes the staging. Various additional MR imaging techniques provide further functional and clinically relevant information during a single examination. In the oncological context the most important techniques are imaging of perfusion and tumor motion. Functional MRI of the lungs complements the pure staging and improves surgical approaches and radiotherapy planning.

Pulmonale Rundherde sind ab der klinisch relevanten Groesse von mm Durchmesser sicher erkennbar. Die Groesse der mediastinalen, hilaeren und supraklavikulaeren Lymphknoten kann in einem Untersuchungsgang bestimmt werden. Die MRT bietet vielfaeltige Moeglichkeiten, zusaetzliche funktionelle, klinisch relevante Informationen innerhalb einer Untersuchung zu erheben.

Im onkologischen Kontext sind die Perfusionsbildgebung der Lunge und die Bewegungsabschaetzung der Tumoren am bedeutendsten.