热阴极微波电子枪功率自洽过程分析

 用等效电路法分析了热阴极微波电子枪的功率自洽过程，给出了微波功率、无载耦合度、束流负载、加速腔参数之间的解析关系式和最佳耦合度的计算公式，阐明了无载耦合度与有载耦合度的关系，分析了枪宏脉冲内微波耦合状态的变化过程，并与实验结果进行了对比，对高占空因子热阴极微波电子枪调束实验中微波反射波形发生较大变化的实验现象进行了分析。     

螺栓紧固型纵振换能器设计考虑

本语文采用网络传输法分析了螺栓螺固型纵振换能器的设计方法，并考虑了换能器结构件的内部机械损耗和压电元件的电损耗，数值计算了换能器谐振特性及节面位置，结果与实验情况一致。     

Determination of SFC, FFA, and equivalent reaction time for enzymatically interestified oils using NIRS

The use of near infrared spectroscopy (NIRS) for rapid determination of the degree of interesterification of blends of palm stearin, coconut oil, and rapeseed oil obtained using an immobilized Thermomyces lanuginosa lipase at 70 °C was investigated. Interesterification was carried out by applying both fixed bed and batch reactors. Calibrations were developed for quantitative determination of solid fat content (SFC) at 10, 20, 30, 35, and 40 °C and free fatty acid (FFA) resulting in root mean square errors of prediction of 1.0, 1.3, 1.4, 1.6, 1.7, and 0.19% (w/w), respectively. The data showed that NIRS could be used to replace the traditional methods for determining FFA and SFC in vegetable oils.It was possible to monitor the activity of the immobilized enzyme for interesterification of margarine oils by predicting the equivalent reaction time in a batch reactor from NIR spectra. Root mean square errors of prediction for two different oil blends interesterified for 300 and 170 min were 21 and 12 min, respectively.     

Regulatory compliance vs. NEXUS quality for laboratory tests

In the U.S., all clinical laboratory testing is regulated by the Clinical Laboratory Improvement Amendments (CLIA) (). The CLIA link test quality and adherence to a body of testing regulations intended to ensure accurate, reliable, and timely patient test results. The goal of the CLIA legislation was to ensure a minimum, fundamental level of quality. In the context of “NEXUS,” quality must “go beyond getting the ‘right’ answer on the ‘right’ patient that can be interpreted against ‘right’ reference values. CLIA regulations with specific minimum, performance requirements, or safeguards, are designed to prevent testing errors. The US Institute of Medicine found that testing processes fail as a result of human error, lack of documentation, and lack of test management. In the latest (2004) interpretations of CLIA regulations, the minimum quality control requirement continues to be analyzing at least two external, liquid quality control materials per test per day. In 1995, we proposed that the responsibility for achieving quality test results shifts from the sole purview of the laboratory director to an “alliance” of laboratory professionals, manufacturers, and regulators. The EQC (equivalent quality control) concept as proposed is a positive step in achieving this alliance. With the obvious lack of scientific and statistical robustness, EQC falls far short of ensuring quality. Achieving the “NEXUS Vision” for quality laboratory testing will not come solely from laboratory professionals. The NEXUS is about how to ensure the full-quality assessment of the testing process – pre-analytical, analytical, and post-analytical.Presented at the 10th Conference Quality in the Spotlight, March 2005, Antwerp, Belgium.     

聚苯乙烯／丁苯橡胶共混物的相关系

用热释电流法和Ｘ光小角散射观察热压聚苯乙烯／丁苯橡胶合金膜，讨论了其相容性．根据Ｐｏｒｏｄ定律用Ｘ－光小角散射估算了界面层厚度．σｂ（相容区），发现了合金组成与σｂ的关系．用Ｄｅｂｙｅ－Ｂｕｅｃｈｅ理论计算了相关距离ａｃ和不变量Ｑａｃ代表合金中的相区尺寸并与σｂ关．Ｑ代表电子密度均方起伏η２，用Ｑ值讨论了合金的均匀性．用透射电子显微镜测定了浇铸膜，并探讨了合金的相分布．     

Ba12Y4.67Ti8O35的交流阻抗谱和氧浓差电势测量

用高温固体合成法制备了经验分子式为Ba12Y4.67Ti8O35的导电陶瓷.利用交流阻抗谱技术、氧浓差电势测量和热电效应测量等方法表征了材料的导电性能.研究指出, 该材料是一种氧离子/空穴混合导体.在700 ℃下，材料本体的电导约为2×10－3 Ω－1•cm－1，氧离子迁移数为0.35.对700 ℃下空气、O2和N2气氛中的交流阻抗谱数据进行了等效电路拟合.拟合指出，在空气和O2气氛中，氧离子的扩散阻抗谱不能明显地观察到是因为氧离子电导通路被空穴电导短路；而在N2气氛中，阻抗谱在低频段表现出特征的扩散阻抗.     

ITER�������������ߵ����Чģ����Ԥ��

ITER超导磁体系统的超导电流传输线导体是由NbTi/Cu管内电缆超导体、辅助绝缘层和接地金属屏蔽层组成的层状复合材料结构。分别采用基于传统的复合材料理论和基于均匀化理论与复合材料损伤理论相结合的方法对超导传输线导体的等效模量进行了理论预测。这些结果为分析和计算超导电流传输线的应力和变形以及热性能提供了必要的参数。     

原子电性作用矢量用于Mannich碱红外光谱模拟

利用原子电性作用矢量(AEIV)对Mannich碱中C＝O与P＝O进行结构参数化表征,并通过多元线性回归(MLR)分析,建立了红外光谱振动频率定量结构光谱相关(QSSR)模型,继以留一法(LOO)交互检验(CV)对模型稳定性进行检验.对C＝O和P＝O键伸缩振动频率的建模相关系数(Rcum)和交互检验相关系数(RLOO)分别为0.9777,0.9973(C=O);0.9433,0.9911(P＝O).结果表明,AEIV与Mannich碱中C＝O与P＝O伸缩振动频率有很好的相关性.     

On the intrinsic accuracy and precision of the standardised growth curve (SGC) and global-SGC (gSGC) methods for equivalent dose determination: A simulation study

In optically stimulated luminescence (OSL) dating, the single aliquot regenerative-dose (SAR) method has been used extensively for determining equivalent doses (D_e) in quartz. A variation of the SAR method is the “standardised growth curve” (SGC) method, which has been used as an efficient procedure to save measurement time during dating studies. During the application of the SGC method one establishes the SGC and calculation of the D_e of an aliquot requires only measurement of the standardised natural dose signal. Recently, a “global standardised growth curve” (gSGC) method was developed as an improved version of the SGC procedure. During the application of the gSGC method, the growth curves are re-normalised using sensitivity-corrected signal corresponding to one of the regenerative doses. Subsequently the D_e of an aliquot is estimated using the sensitivity-corrected natural dose signal and an additional sensitivity-corrected regenerative dose signal as well as the established gSGC. In the present study, simulations are performed to assess the intrinsic accuracy and precision of the SGC and gSGC D_e estimates. The results of our simulations validate that the gSGC method is intrinsically more precise than the SGC method and is also more accurate for doses greater than 210 Gy. Several factors which affect the reliability of the two methods are investigated.     

A renorming of some nonseparable Banach spaces with the Fixed Point Property

We prove that for every Banach space which can be embedded in c₀(Γ) (for instance, reflexive spaces or more generally spaces with M-basis) there exists an equivalent renorming which enjoys the (weak) Fixed Point Property for non-expansive mappings. As a consequence, we solve a longtime open question in Metric Fixed Point Theory: Every reflexive Banach can be renormed to satisfy the Fixed Point Property. Furthermore, this norm can be chosen arbitrarily closed to the original norm.