Stress-corrosion-crack initiation and growth-rate studies on titanium grade 7 and alloy 22 in concentrated groundwater

The stress-corrosion-crack initiation and growth-rate response was evaluated on as-received, cold-worked, and aged Alloy 22 (UNS N06022) and titanium Grade 7 in 105 °C to 110 °C, aerated, concentrated, high-pH groundwater environments. Time-to-failure experiments on actively loaded tensile specimens evaluated the effects of applied stress, welding, surface finish, shot peening, cold work, crevicing, and aging treatments in Alloy 22. Titanium Grade 7 and stainless steels were also included in the matrix. Long-term crack-growth-rate data showed stable crack growth in titanium Grade 7. Alloy 22 exhibited stable growth rates under “gentle” cyclic loading, but was prone to crack arrest at fully static loading. No effect of Pb additions was observed. This article is based on a presentation made in the symposium “Effect of Processing on Materials Properties for Nuclear Waste Disposition,” November 10–11, 2003, at the TMS Fall meeting in Chicago, Illinois, under the joint auspices of the TMS Corrosion and Environmental Effects and Nuclear Materials Committees.     

Ermittlung der Verformungen und Spannungen einer gelochten Gummimembran mit Hilfe von Rasterverfahren

Zusammenfassung Für eine gelochte Gummimembran wird die Verformung mit einem Rasterverfahren in unterschiedlichen Laststufen experimentell ermittelt. Hierzu werden die Koordinaten eines Kreuzrasters auf der Gummioberfl?che mit der digitalen Bildverarbeitung automatisch bestimmt. Aus einem zuvor angepa?ten Stoffgesetz ergeben sich dann die Spannungen und die Schnittkr?fte in Lastrichtung. Durch Vergleich mit den bekannten ?u?eren Lasten wird die Genauigkeit des Verfahrens überprüft.     

Automated real-time hit picking, retesting, and reflux testing

Advances in automation have enabled screening methods, such as enzymatic assays and ELISAs, to be performed in a high-throughput fashion. Instruments can perform each of the steps more rapidly and with fewer errors than humans, however, in many cases, humans still perform the key steps of integrating the instruments and Laboratory Information Management Systems (LIMS). Typically, the screening process involves multiple steps for sample testing, manual data entry and design of protocols to handle the positive samples, and final processing of positives. Fully integrated systems such as Protedyne's BioCube^™ System combine liquid handling, LIMS, plate washing, and plate reading in a device that is controlled via a single user interface. As an example, we present the results of automating plate reading and retesting of positive samples in a model protocol based on ELISA testing. By performing an automated initial screening of results, our system enables positive samples to be retested at higher stringency or sent to a technician for corroboration of results. The screening process then becomes a single protocol that starts with a sample set and results in a data set of tested and retested/reflux tested positives as well as re-arrayed plates of positive samples that are ready for additional downstream processing.     

Dreidimensionales Stauchen von Rechtkantblöcken

Schrankenverfahren zur Berechnung der Umformkraft und Umformleistung. Tschebyscheff-Polynome als Ansatzfunktionen für das Geschwindigkeitsfeld. Vergleich der Ergebnisse.     

第一代葡萄牙风景园林大师（1940—1970）

详细阐述了第一代葡萄牙风景园林大师弗朗西斯科·卡德拉·卡法兰的求学和工作历程,着重介绍了他在葡萄牙风景园林教育和研究上取得的卓越成就,创立专业的实践课程并为教育系统奠定基础,使其成为欧洲风景园林行业先锋之一。法兰卡还积极参与风景园林实践,从私人庭院、公园到农场建设、水利灌溉以及当地和周边的景观规划都有所涉及,设计了设计了国家体育馆、阿格莱拉庄园和其他在全球各地的精典作品。     

Assessing the degree of osteoporosis in the axial skeleton using the dependence of the fractal dimension on the grey level threshold

Combining the measurement of bone mineral density (BMD) and the classification of the trabecular structure in cancellous bone improves the estimation of the degree of osteoporosis. A fractal method for the automatic quantitative classification of the trabecular structure in midvertebral slices of lumbar vertebrae is introduced. This method is based on the computation of the fractal dimension (box counting method) for varying binarization thresholds. Radiographic images from 30 lumbar vertebrae and CT images from an additional 16 lumbar vertebrae were analysed by calculating the dimension D in dependency of the threshold value T. The function D(T) was normalized by the average image grey value, eliminating the bone mineral density from the computations. The results show that the images of the lumbar vertebrae have fractal properties, and the function D(T) has a typical behaviour that allows the discrimination of the degree of osteoporosis. With two parameters extracted from the function D(T) the correlation coefficients with BMD were both -79% for the radiographic images, and -93% and -91% for the CT data, respectively.     

Monitoring and modeling stress corrosion and corrosion fatigue damage in nuclear reactors

Despite the serious impact of stress-corrosion cracking and corrosion fatigue, the relevant design and operational guidelines for light-water nuclear reactors are often just rules of thumb which identify susceptibility or codes which only quantify the effects of stress. However, quantitative understanding of the crack advance process is unfolding for several alloy types, and modeling now permits accurate prediction of crack growth over a wide range of material, environmental and stress conditions.     

Blockstauchen zwischen ebenen parallelen Bahnen

Verfahren zur Stauchdruckbestimmung und Berechnung plastischer Umformvorgänge. Zweidimensionales Modell für das Blockstauchen. Geschwindigkeitsfeld und obere Schranke. Untersuchungsergebnisse.     

Pituitary dwarfism in German shepherd dogs: additional evidence of simple, autosomal recessive inheritance

Previous observations suggested that pituitary dwarfism of German Shepherd dogs is due to simple, autosomal recessive inheritance, but own data were insufficient to test the hypothesis. The total material now includes six dwarfs from five litters. Omitting the proband litter, a total of 21 dogs from four litters, each with one dwarf, were relevant for testing goodness of fit. The observed segregation ratio was in agreement with that expected and thus supported the genetic hypothesis. According to this hypothesis it was possible to point at various heterozygous carriers among ancestors of the dwarfs within a pedigree comprising 13 generations.