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101.
102.
Uwe Gerlach 《Metallurgical and Materials Transactions A》1986,17(3):435-442
In the present work it is shown that metallographic analysis can supply a lot of detailed information about metallurgical
events which happen during the penetration of metallic projectiles into armor steel. With the help of these findings models
of penetration processes are derived. The deformation, fracture, and phase transformation processes of projectiles are investigated,
which consist of tungsten, a tool steel, and a tungsten heavy metal, respectively. These were shot into armor steel at velocities
between 1000m/s and 2000 m/s. The extensively deformed tungsten and the brittle steel form two opposite poles; between those
the heavy metal takes a mid position. The more ductile a material is, the sooner its penetration approaches the piercing of
a liquid jet. On the other hand, in a brittle material quick rupture is followed by turbulent motion and friction welding
of the fragments. In this case extensive deformation is observed only in the skin layer of a fragment and in shear bands.
Special attention is drawn to features which are characteristic for ballistic piercing processes,e.g., molten films and adiabatic shear deformation.
Formerly Research Scientist at the Hochschule der Bundeswehr in Hamburg, West Germany, and thereafter at an institute in France
doing military research 相似文献
103.
Uwe Klammert Elke Vorndran Tobias Reuther Frank A. Müller Katharina Zorn Uwe Gbureck 《Journal of materials science. Materials in medicine》2010,21(11):2947-2953
Synthetic bone replacement materials are of great interest because they offer certain advantages compared with organic bone
grafts. Biodegradability and preoperative manufacturing of patient specific implants are further desirable features in various
clinical situations. Both can be realised by 3D powder printing. In this study, we introduce powder-printed magnesium ammonium
phosphate (struvite) structures, accompanied by a neutral setting reaction by printing farringtonite (Mg3(PO4)2) powder with ammonium phosphate solution as binder. Suitable powders were obtained after sintering at 1100°C for 5 h following
20–40 min dry grinding in a ball mill. Depending on the post-treatment of the samples, compressive strengths were found to
be in the range 2–7 MPa. Cytocompatibility was demonstrated in vitro using the human osteoblastic cell line MG63. 相似文献
104.
105.
Uwe Fisher 《电源世界》2008,(7)
英飞集成系统实际给我们提供了一种方案:目前,我们可以根据现在的需求而选择40kW的功率,当我们的业务增长时,英飞集成系统可以轻松升级以适应我们的需要。" 相似文献
106.
Comparative Assessment of Complex Stabilities of Radiocopper Chelating Agents by a Combination of Complex Challenge and in vivo Experiments 下载免费PDF全文
Shanna Litau Dr. Uwe Seibold Alicia Vall‐Sagarra Prof. Dr. Gert Fricker Prof. Dr. Björn Wängler Priv.‐Doz. Dr. Carmen Wängler 《ChemMedChem》2015,10(7):1200-1208
For 64Cu radiolabeling of biomolecules to be used as in vivo positron emission tomography (PET) imaging agents, various chelators are commonly applied. It has not yet been determined which of the most potent chelators—NODA‐GA ((1,4,7‐triazacyclononane‐4,7‐diyl)diacetic acid‐1‐glutaric acid), CB‐TE2A (2,2′‐(1,4,8,11‐tetraazabicyclo[6.6.2]hexadecane‐4,11‐diyl)diacetic acid), or CB‐TE1A‐GA (1,4,8,11‐tetraazabicyclo[6.6.2]hexadecane‐4,11‐diyl‐8‐acetic acid‐1‐glutaric acid)—forms the most stable complexes resulting in PET images of highest quality. We determined the 64Cu complex stabilities for these three chelators by a combination of complex challenge and an in vivo approach. For this purpose, bioconjugates of the chelating agents with the gastrin‐releasing peptide receptor (GRPR)‐affine peptide PESIN and an integrin αvβ3‐affine c(RGDfC) tetramer were synthesized and radiolabeled with 64Cu in excellent yields and specific activities. The 64Cu‐labeled biomolecules were evaluated for their complex stabilities in vitro by conducting a challenge experiment with the respective other chelators as challengers. The in vivo stabilities of the complexes were also determined, showing the highest stability for the 64Cu–CB‐TE1A‐GA complex in both experimental setups. Therefore, CB‐TE1A‐GA is the most appropriate chelating agent for *Cu‐labeled radiotracers and in vivo imaging applications. 相似文献
107.
108.
在人类面临全球性环境污染和生态破坏的今天,可持续发展的概念已在有关自然、环境、经济、社会、科技等相关讨论中无处不在,能既满足当代人的需求,又不破坏后代人的需求已经是当今全球范围内最重视的研究课 相似文献
109.
Chin‐Yi Liu Zachary C. Holman Uwe R. Kortshagen 《Advanced functional materials》2010,20(13):2157-2164
Silicon nanocrystals (Si NCs) are shown to be an electron acceptor in hybrid solar cells combining Si NCs with poly(3‐hexylthiophene) (P3HT). The effects of annealing and different metal electrodes on Si NC/P3HT hybrid solar cells are studied in this paper. After annealing at 150 °C, Si NC/P3HT solar cells exhibit power conversion efficiencies as high as 1.47%. The hole mobility in the P3HT phase extracted from space‐charge‐limited current measurements of hole‐only devices increases from 2.48 × 10?10 to 1.11 × 10?9 m2 V?1 s?1 after annealing, resulting in better transport in the solar cells. A quenching of the open‐circuit voltage and short‐circuit current is observed when high work function metals are deposited as the cathode on Si NC/P3HT hybrid devices. 相似文献
110.
Marianne Wittrup Larsen Dr. Dorota F. Zielinska Mats Martinelle Dr. Aurelio Hidalgo Dr. Lars Juhl Jensen Prof. Uwe T. Bornscheuer Prof. Karl Hult Prof. 《Chembiochem : a European journal of chemical biology》2010,11(6):796-801
A water tunnel in Candida antarctica lipase B that provides the active site with substrate water is hypothesized. A small, focused library created in order to prevent water from entering the active site through the tunnel was screened for increased transacylation over hydrolysis activity. A single mutant, S47L, in which the inner part of the tunnel was blocked, catalysed the transacylation of vinyl butyrate to 20 mM butanol 14 times faster than hydrolysis. The single mutant Q46A, which has a more open outer end of the tunnel, showed an increased hydrolysis rate and a decreased hydrolysis to transacylation ratio compared to the wild‐type lipase. Mutants with a blocked tunnel could be very useful in applications in which hydrolysis is unwanted, such as the acylation of highly hydrophilic compounds in the presence of water. 相似文献