多孔钯的制备及其结构与性能

研究了以钯粉和碳酸钠为原料制备多孔钯的烧结-溶解新工艺，用FESEM分析了多孔钯的微观结构形貌，并进一步研究了制备的多孔钯的力学性能和氢同位素的交排换代性能。结果表明，烧结-溶解工艺能稳定地制备出孔隙率为85．29％-87．82％的多孔钯，其压缩强度大于2MPa。室温下孔隙率为87.30％的多孔钯对氘的单位质量吸收量为0．0767L／g，氢同位素排代交换率为86．2％。     

室温轧制高纯铝亚结构的EBSD研究

!!用背散射电子衍射(EBSD)技术测试了室温轧制高纯铝的微取向分布,提出了表征亚结构定量信息的概念并开发了分析软件,研究了亚晶的尺寸及其平均取向差的定量特征。结果表明,平均取向差(θcry)小于15°的亚晶数量占95%以上,其平均直径约6μm￣7μm,随亚晶平均取向差增大,亚晶平均尺寸增大;亚晶尺寸与其自身平均取向差和周围亚晶平均取向差的平均值(θenv)有关,当θcry/θenv>1时,其尺寸大于周围亚晶尺寸的平均值;反之也成立。     

数字技术在建筑设计中的应用

基于建筑方案设计与建筑评价两个方面介绍数字技术在建筑设计中的应用,同时用新的手段提出非线性设计法、参数设计法及生成设计等新的设计方法在建筑设计中的应用,这对新的数字技术在建筑工程设计的使用和建筑设计的优化有着重要意义。     

直流电弧放电法合成In2O3纳米粒子

电弧放电法因能在瞬间产生高温使原料气化而成为一种高效的纳米材料制备方法。以金属In为原料,在无催化剂的条件下,采用直流电弧放电法直接合成了In2O3纳米粒子。XRD、SEM和TEM结果表明所制备的In2O3纳米粒子为立方结构,形貌为结晶良好的八面体,平均粒径为60～120nm。纳米粒子之间以点接触和面接触相连。     

A multiplex degenerate PCR analytical approach targeting to eight genes for screening GMOs

Currently, the detection methods with lower cost and higher throughput are the major trend in screening genetically modified (GM) food or feed before specific identification. In this study, we developed a quadruplex degenerate PCR screening approach for more than 90 approved GMO events. This assay is consisted of four PCR systems targeting on nine DNA sequences from eight trait genes widely introduced into GMOs, such as CP4-EPSPS derived from Acetobacterium tumefaciens sp. strain CP4, phosphinothricin acetyltransferase gene derived from Streptomyceshygroscopicus (bar) and Streptomyces viridochromogenes (pat), and Cry1Ab, Cry1Ac, Cry1A(b/c), mCry3A, and Cry3Bb1 derived from Bacillus thuringiensis. The quadruplex degenerate PCR assay offers high specificity and sensitivity with the absolute limit of detection (LOD) of approximate 80 target copies. Furthermore, the applicability of the quadruplex PCR assay was confirmed by screening either several artificially prepared samples or samples of Grain Inspection, Packers and Stockyards Administration (GIPSA) proficiency program.     

Investigation into the Maillard reaction between ɛ-polylysine and dextran in subcritical water and evaluation of the functional properties of the conjugates

The effects of temperature and pressure on the Maillard reaction between ?-polylysine and dextran in subcritical water were investigated. Browning index was determined at 420 nm, and degree of graft was estimated by O-phthaldialdehyde (OPA) method. The formation of conjugates by Maillard reaction was testified by UV–vis spectrum and SDS-polyacrylamide gel electrophoresis (SDS-PAGE). The emulsifying activity of the conjugates was greatly improved with the rise of temperature. The antimicrobial activity of the conjugates formed below 110 °C remained the same as ?-polylysine, and then decreased obviously when the reaction temperature was above 120 °C. The reaction pressure (0–10 MPa) had no effect on the emulsifying and antimicrobial activities, but higher pressure could effectively inhibit the formation of browning compounds.     

用相对热指标和预测平均反应研究火车站热舒适状况

介绍了稳态和过渡空间下室内热舒适性的评价指标,对西安火车站候车厅热环境参数进行了现场测试,并用RWI和PMV．PPD两个指标对测试环境的热舒适性进行分析计算和评价,认为RWI指标更适合评价火车站热舒适。     

印刷电路板上化学镀钯工艺研究

采用L9(34)混合正交体系,系统地研究复合络合剂-乙二胺、乙二胺四乙酸二钠和丙烯酸在不同工艺参数和不同添加配比情况下对化学镀钯质量的影响,以镀层的光亮度,镀液的稳定性和沉积速度为评价指标,筛选出最佳的化学镀钯添加剂为:乙二胺0.2mol/L,乙二胺四乙酸二钠0.01mol/L,丙烯酸0.3mol/L,pH值8。研究结果表明,优化后的化学镀钯镀液稳定性高、沉积速度快、钯膜与基体镍镀层结合力强、钯镀层光亮性好。     

浅析ADSL的应用

ADSL是近期推出的电信网接入的新技术，主要用于Internet的高速接入，适用于网络的各种应用。介绍了ADSL的定义、调制方式、典型应用、与其他接入方式的类比及ADSL的发展。     

Simulation of high-resolution X-ray microscopic images for improved alignment

The introduction of precision optical elements to X-ray microscopes necessitates fine realignment to achieve optimal high-resolution imaging. In this paper, we demonstrate a numerical method for simulating image formation that facilitates alignment of the source, condenser, objective lens, and CCD camera. This algorithm, based on ray-tracing and Rayleigh-Sommerfeld diffraction theory, is applied to simulate the X-ray microscope beamline U7A of National Synchrotron Radiation Laboratory (NSRL). The simulations and imaging experiments show that the algorithm is useful for guiding experimental adjustments. Our alignment simulation method is an essential tool for the transmission X-ray microscope (TXM) with optical elements and may also be useful for the alignment of optical components in other modes of microscopy.