Berufliche Zuverlässigkeit; Verfehlungen; Ausschluss vom Vergabeverfahren

Zur beruflichen Unzuverl?ssigkeit k?nnen Verletzungen früherer Leistungsvertr?ge mit dem ?ffentlichen Auftraggeber führen, die über die üblicherweise bei Bauvorhaben auftretenden Ausführungsm?ngel und Unstimmigkeiten bei der Abrechnung deutlich hinausgehen.     

Comparative psychology?

A review of types of animals and behavior studied in the Journal of Comparative and Physiological Psychology from 1968 to July 1972 suggests that American comparative psychologists have maintained an extremely narrow position by concentrating their experimental work on learning and on the rat. Future research may lean more toward the physiological aspects of behavior. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Thermally Pretreated 46% Pt/Vulcan XC72: Characterisation by TGA/DSC/TEM and Cyclic Voltammetry

We report a study of thermal stability and impact of thermal pretreatment procedures for 46% Pt/Vulcan XC72 (Tanaka) fuel cell catalyst. Stability in air and in inert gas (nitrogen, argon, helium) has been investigated by thermal gravimetric analysis (TGA), TGA‐mass spectrometry (TGA‐MS) and differential scanning calorimetry (DSC). Two distinct low temperature mass loss processes (100–200 and 285–300 °C) were observed, each exhibiting unique pretreatment temperature dependencies. TGA‐MS data in helium show fragment ions that suggest the thermal degradation processes are associated with decomposition of materials such as processing aids. Transmission electron microscopy (TEM) reveals a modest increase in average Pt nanoparticle size upon thermal pretreatment. After a pretreatment protocol based on TEM and thermal characterisation (300 °C/15 min, N₂), the electrochemically active surface area did not increase. At the kinetically controlled potential region (E >0.8 V) there was a small drop in current density for treated 46% Pt/C in comparison with as‐received catalyst. The slowing in ORR kinetics is significant. Apparently, the removal of organic components, which would improve mass transport, is negated by increased nanoparticle size.     

基于不同化学还原法制备的Au/XC-72及其对L-CySH的催化氧化反应研究

本文采用乙二醇还原法、抗坏血酸还原法、柠檬酸三钠还原法及硼氢化钠还原法合成胶体金溶液,并将其负载于XC-72上制备Au/XC-72催化剂。X射线衍射(XRD)表明四种方法制备的催化剂均具有明显的Au特征衍射峰,且硼氢化钠还原法制备的Au衍射峰最平缓。透射电子显微镜(TEM)表明硼氢化钠还原法制备的金纳米颗粒(Au NPs)粒径最小,在XC-72表面分布均匀,其他三种方法制备的AuNPs粒径较大,且发生不同程度的团聚。利用制备的催化剂(Au/XC-72)修饰玻碳电极(GCE)并用于L-半胱氨酸(L-CySH)的电催化氧化机制研究,结果显示硼氢化钠还原法制备的Au/XC-72在pH为2时对L-CySH的催化氧化较其它三种方法制备的材料表现出最优的活性,且在1m M～10m M的范围内呈现线性关系,表明L-CySH在Au/XC-72上的氧化反应的速率是受扩散过程控制的。电催化活性高粒径小的Au/XC-72修饰GCE构建的传感器具有广泛的实际应用价值。     

A design method for flaming fire detection

The scientific basis of a design method for the detection of flaming fires is reviewed. The equations required to calculate detector spacings are included and the selection of appropriate design input parameters is discussed. Limitations of the method and areas for further research are identified. The design method has been implemented and proposed for inclusion in NFPA Standard 72E-1984 as Appendix C by the 72E-M Committee. Center for Fire Safety Studies Worcester Polytechnic Institute     

72B�߲��ƻɶ���ԭ�����

 72B线材在绕簧过程中发生了断裂现象。利用金相显微镜对断口附近的金相组织、非金属夹杂物和表面形貌等进行了分析。结果表明：钢丝表面有损伤,且损伤部位出现横向裂纹和形变马氏体,这是导致绕簧过程中发生断裂的主要原因。针对断裂产生的原因,提出具体的改进措施。     

Regular ordered semigroups in terms of fuzzy subsets

Given a set S, a fuzzy subset of S (or a fuzzy set in S) is, by definition, an arbitrary mapping f : S → [0, 1] where [0, 1] is the usual interval of real numbers. If the set S bears some structure, one may distinguish some fuzzy subsets of S in terms of that additional structure. This important concept of a fuzzy set was first introduced by Zadeh. Fuzzy groups have been first considered by Rosenfeld, fuzzy semigroups by Kuroki. A theory of fuzzy sets on ordered groupoids and ordered semigroups can be developed. Some results on ordered groupoids-semigroups have been already given by the same authors in [N. Kehayopulu, M. Tsingelis, Fuzzy sets in ordered groupoids, Semigroup Forum 65 (2002) 128-132; N. Kehayopulu, M. Tsingelis, The embedding of an ordered groupoid into a poe-groupoid in terms of fuzzy sets, Inform. Sci. 152 (2003) 231-236; N. Kehayopulu, M. Tsingelis, Fuzzy bi-ideals in ordered semigroups, Inform. Sci. 171 (2004) 13-28] where S has been endowed with the structure of an ordered semigroup and defined “fuzzy” analogous for several notions that have been proved to be useful in the theory of ordered semigroups. The characterization of regular rings in terms of right and left ideals is well known. The characterization of regular semigroups and regular ordered semigroups in terms of left and right ideals or in terms of left, right ideals and quasi-ideals is well known as well. The characterization of regular le-semigroups (that is lattice ordered semigroups having a greatest element) in terms of right ideal elements and left ideal elements or right, left and quasi-ideal elements is also known. In the present paper we first give the main theorem which characterizes the regular ordered semigroups by means of fuzzy right and fuzzy left ideals. Then we characterize the regular ordered semigroups in terms of fuzzy right, fuzzy left ideals and fuzzy quasi-ideals. The paper serves as an example to show that one can pass from the theory of ordered semigroups to the theory of “fuzzy” ordered semigroups. Some of our results are true for ordered groupoids in general.     

Detecting change-points in Markov chains

Markov chains provide a flexible model for dependent random variables with applications in such disciplines as physics, environmental science and economics. In the applied study of Markov chains, it may be of interest to assess whether the transition probability matrix changes during an observed realization of the process. If such changes occur, it would be of interest to estimate the transitions where the changes take place and the probability transition matrix before and after each change. For the case when the number of changes is known, standard likelihood theory is developed to address this problem. The bootstrap is used to aid in the computation of p-values. When the number of changes is unknown, the AIC and BIC measures are used for model selection. The proposed methods are studied empirically and are applied to example sets of data.     

FANUC0i与华中HNC-21／22T系统的G72、G73指令应用的区别

通过对比分析G72、G73指令在FANUC0i系统和华中HNC-21／22T系统的数控车床上编程格式、编程要求和指令执行过程,得出G72、G73指令在2种系统上应用时,编程格式、编程要求和指令执行过程的异同,并使用G72、G73指令编程,在上述数控车床上进行了加工验证,验证结果表明,本文所做的分析和结论完全符合实际情况,可以作为在实际中使用这2种数控系统功能指令的参考依据。     

Enhancement of the efficiency and the color stabilization in green organic light-emitting devices with multiple heterostructures acting as a hole transport layer

The electrical and the optical properties of organic light-emitting devices (OLEDs), with and without multiple heterostructures consisting of N, N-bis-(1-naphthyl)-N, N-diphenyl-1,1-biphenyl-4,4-diamine (NPB)/5,6,11,12-tetraphenylnaphthacene (rubrene) acting as a hole transport layer (HTL), were investigated. The OLEDs with 3 periods of NPB/mixed rubrene:NPB multiple heterostructures acting as an HTL showed the highest luminances and efficiencies. While the electroluminescence (EL) peak corresponding to the rubrene layer did not appear for the OLEDs with 3 periods of NPB/mixed rubrene:NPB multiple heterostructures, only the EL peak related to the tris (8-hydroxyquinoline) aluminum layer was observed. The Commission Internationale de l’Eclairage chromaticity coordinates of the OLEDs with 3 periods of NPB/mixed rubrene:NPB multiple heterostructures at 14 V were (0.321, 0.531), indicative of a deep stabilized green color.