核径迹法和活性炭法测定香港室内氡浓度

用活性碳吸附和核径迹计数方法测定香港地区的室内氡浓度。结果表明,工作场所室内氡浓度平均值明显的比住宅高。     

基于快走丝线切割加工的工作液分析

分析了工作液在线切割加工中的作用和应满足的性能要求，讨论了乳化液使用时应注意的几个重要问题。     

爆炸喷涂技术的现状和应用

详细地介绍了爆炸喷涂技术的现状，设备特性和技术应用领域，爆炸喷涂涂层与基体的结合强度，涂层的硬度和表观孔隙率都是等离子热喷涂所无法达到的。     

1-Cyano-2,3-Epithiopropane as the Primary Sinigrin Hydrolysis Product of Fresh Cabbage

Dichloromethane extracts of juices from fresh cabbages, including four known (Brutus, Galaxy, Bentley, Structon) and two unknown cultivars, were analyzed by X-MS for the presence of sinigrin degradation products. Allyl isothiocyanate (AITC), which has been reported to be the important aroma compound of freshly disrupted cabbage was not detected in any of the dichloromethane extracts of cabbage juice. Instead, 1-cyano-2,3-epithiopropane, which is one of the isomers of AITC, was the primary volatile compound in all cabbage extracts. AITC was detected in relative trace concentration only when cabbage juice was injected into the GC, using a wide bore, packed column. Thus, the relative importance of AITC and 1-cyano-2,3-epithiopropane to the aroma of freshly disrupted cabbage should be considered.     

吉林省大安市苏打碱土碱化参数之间的关系

选择典型苏打碱化土壤,对土壤碱化度(ESP)、钠吸附比(SAR)、残余碳酸钠(RSC)、总碱度和pH等进行了测定计算,分析了各碱化参数之间的关系,得出了各参数之间的相关方程。结果表明,除pH外,苏打碱土各碱化参数之间均具有极显著的相关性,各参数之间关系密切。土壤pH与ESP和SAR之间的关系变异性较大,利用pH推算该区苏打碱土碱化状况将会产生很大的不确定性。     

粉末冶金高速压制成形的压制方程

瑞典Hydropulsor AB制造并出售其独创的液压冲击机后，解决了长期以来限制高速压制技术工业化应用的设备问题，使该技术得到极大的推动。文内介绍了高速压制的特点，如压制压力、压制速度、压坯密度分布，脱模压力等；对高速压制致密化机制进行了探讨，提出了“热软化剪切致密化机制”，据此给出了相应的压制方程Inφ=k1△HL／k2 exp[kz（1-P/△HL）＋C。并利用实验数据进行了验证。结果表明，该方程具有满意的精度和广泛的适用性。     

纳微米硼酸盐添加剂的抗磨减摩性能研究

用超声波乳化分散，在微乳液中反应制备了球状无定型纳微米硼酸盐添加剂，粒径为50—250nm。用四球摩擦试验机研究其摩擦学性能，当WB＝0．5％时，磨斑直径最小，减摩性能最优。用XPS分析了纳微米硼酸盐添加剂在摩擦表面，摩擦化学反应产物硼氧化物、O—B—N类化合物、酸性化合物以及吸附的有机化合物组成。并探讨了其抗磨减摩机理。     

Characteristics and Functional Properties of Protein Isolates from Various Peanut (Arachis hypogaea L.) Cultivars

Protein isolates from 9 cultivars of peanut (Arachis hypogaea L.) were compared. Sephadex G-200 gel filtration and nondenaturing polyacrylamide gel electrophoresis (NPAGE) of the protein isolates showed very similar patterns of arachin and nonarachin fractions. The content of individual fractions was somewhat different among cultivars, possibly indicating genetic variability. Sodium dodecyl sulfate-PAGE (SDS-PAGE) showed that the protein isolates had extremely complex sub-unit compositions. The content of acidic amino acids of the protein isolates was 34–38%, basic was 15–17%. Differences in some functionalities such as solubility and emulsification activity were conspicuous among cultivars.     

基于触摸屏控制器的在线动态数据采集及预处理

基于触摸屏控制器可以动态进行在线笔迹、压力、片内温度、电池电压测量,而在线动态签名认证越来越多的运用于--银行金融系统以及个人身份识别等,笔迹的数据采集以及预处理对后续认证的准确性尤为重要.本文着重介绍了触摸屏的工作原理以及如何利用单片机SST89E554RC、触摸屏和触摸屏控制器TSC2046来实现对在线笔迹、压力、片内温度和电池电压在内的数据采集,以及笔迹数据预处理的方法.     

强流脉冲电子加速器充电调整

本文对强流脉冲电子加速器的充电过程进行了分析,并推导出电压传输系数的解析表达式。该表达式是用充电回路方程经拉氏变换后所得特征方程的特征根形式来表达的。对特征根的物理含义给予了合理的解释,并给出了近似表达式。文中还给出了从实测电压波形中求得特征根值的方法和公式,因而可以从实测电压波形中求出加速器的某些动态参数。