2S83A及精粗组合算法简介

2S83A是美国AD公司生产的一个单片旋变到数字的转换器，它具有高通过率、高精度等特性。此外，该器件还集成了外围器件，并采用16位并行的通信方式，因而可极大的简化数据采集的电路设计，非常适合工业控制系统。而精粗组合算法是编码中的精华。     

Heat-induced denaturation/aggregation of porcine plasma and its fractions studied by FTIR spectroscopy

The aim of the present work is the in depth study of the protein aggregation mechanisms of whole porcine plasma and its fractions (serum, albumin and globulins) during heating using FTIR spectroscopy. Also, 2D correlation spectroscopy (2D COS) was used to establish the sequence of events during heat-induced gelation for all fractions. The results indicate that serum albumin quickly aggregates from 70 °C through non-native intramolecular β-sheets while globulins show lower susceptibility to protein aggregation. When found together, the aggregation pattern strongly depends on the composition of the protein mixture. That makes the great difference between plasma (serum albumin + globulins + fibrinogen) and serum (serum albumin + globulins) behavior, with the aggregation degree at the end of the thermal process being enhanced in the presence of fibrinogen - and achieving a similar level to that of serum albumin - while minimized in its absence. Attending on the low content of fibrinogen in plasma, our results suggest a great fibrinogen ability to alter the thermal serum albumin and globulins behavior by modifying the negative interactions established between them when no more proteins are found in the media. Moreover, it is noteworthy the slow plasma aggregation pattern at the beginning of the thermal process relative to serum albumin, this way allowing a higher protein unfolding. This could be related to the high heat-induced gel properties of plasma. Also, 2D COS indicates that the sequence of events is very similar for the all analyzed samples, with α-helix being more thermo-labile than native β-sheet structure.     

工艺条件对耐硫变换催化剂COS转化活性以及甲硫醇生成量的影响

模拟工业装置的工艺条件,考察了原料气中CO和H2S含量、温度和水气比等因素对耐硫变换催化剂COS转化活性和甲硫醇生成量的影响。结果表明,当原料气中CO和H2S含量较高时,会有甲硫醇生成,且其生成量随着CO和H2S含量增加而增加;受平衡的影响,原料气中H2S含量升高时,COS转化率降低;增加反应温度,可以提高COS的氢解反应活性,并减少甲硫醇的生成,但不利于COS的水解反应。水气比具有提高COS转化活性并减少甲硫醇生成的双重作用:水气比较低时,其值从0增加到0.2,COS转化率从89.65%增加到97.82%,表明COS的水解反应比氢解反应更容易进行;当水气比为0.3时,反应后的尾气中只有微量甲硫醇生成,当水气比大于0.4时,反应后几乎无甲硫醇生成。     

基于Android平台的安全TF卡设计

安全TF卡是一款便于携带、支持公钥基础设施(PKI)的身份认证产品,它同时具有安全认证和存储的功能,在移动终端、手机银行、数字版权保护方面有着广泛的应用前景。文中提出了一种基于安全芯片的安全TF卡设计方法,简要介绍了TF卡的系统设计框架和程序开发流程,并针对Android平台,创新性地采用文件读写的方式完成上位机和TF主控制器之间的通信,通过优化通信协议大大提升了数据传输的速率和稳定性,最后介绍了利用JNI技术进行Android演示程序开发的要点。     

T_(201) 催化剂上 COS 加氢反应动力学研究

在３１０～４００℃及常压下，采用等温积分反应器研究了Ｔ２０１型催化剂上ＣＯＳ加氢反应的动力学。实验采用正交设计，实验数据以改进的Ｍａｒｑｕａｒｄｔ方法进行最优化处理，得到幂函数型动力学方程。     

壳寡糖佐剂对甲型肝炎病毒疫苗诱导小鼠体液免疫应答的影响

目的探讨壳寡糖(chitooligosaccharide,COS)佐剂对甲型肝炎病毒(hapatitis A virus,HAV)疫苗诱导小鼠体液免疫应答的影响。方法将ICR小鼠随机分成9组:甲型肝炎减毒活疫苗Hep A-l 18 EU+不同剂量COS(100μg、500μg、1 mg、2.5 mg、5 mg、10 mg)组、阴性对照组(生理盐水)、抗原对照组(Hep A-l 18 EU)和铝佐剂对照组[Hep A-l18 EU+Al(OH)3200μg],每组6只,各组均经皮下注射ICR小鼠,200μl/只。于免疫后的第4、8、12和16周,采用间接ELISA法检测小鼠血清中抗-HAV特异性Ig G抗体水平。在实验期间,观察小鼠的健康状况,并于免疫16周后,取COS最佳剂量组及阴性对照组小鼠肾脏、脾脏、肝脏、肺脏、心脏组织,制备病理切片,进行对比观察。结果除阴性对照组外,各组小鼠免疫4周后均产生抗-HAV Ig G抗体,并随着时间的延长呈上升趋势,在第8周时均达峰值,随后逐渐下降;COS 2.5 mg、5 mg和10 mg组小鼠血清在各时期的抗体水平均显著高于抗原对照组和铝佐剂对照组(P0.05),且能维持较长时间,至16周抗体水平仍与铝佐剂对照组相当,差异无统计学意义(P0.05),其中COS5 mg组在整个试验过程中产生的抗体水平均最高,且与2.5 mg组峰值水平差异有统计学意义(P0.05),与10 mg组水平相当,至免疫后16周,COS 5 mg组与10 mg组抗体水平差异有统计学意义(P0.05)。COS最佳剂量为5 mg/只。试验期内,观察小鼠各项生理指标未见异常,COS 5 mg组小鼠心脏、肝脏、脾脏、肺脏、肾脏组织均未观察到病变。结论 COS可显著增强HAV疫苗诱导小鼠的体液免疫应答,有望开发为一种可替代铝佐剂的新型佐剂。     

ON THE KINETICS BETWEEN COS AND HETEROCYCLIC AMINES IN AQUEOUS SOLUTIONS

The reaction kinetics between COS and aqueous solutions of some heterocyclic amines have been studied at 303 K. The reaction of COS with l,4-Diazabicyclo[2.2.2]oclane (DAB) and 1,2-Dimethylimidazole (DMI) has been investigated in an intensely stirred batch reactor; the reaction between COS and aqueous solutions of l,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) has been studied by means of the stirred cell technique. The reaction of COS with aqueous DMI and DAB was found to be extremely slow and the observed reaction order in the amine concentration was about 0·8. The overall reaction rate for the reaction of COS with aqueous DBU solutions was rather high, whereas the observed reaction order in the DBU concentration was found to be about 1·7.     

基于μCOS的预定义UI交互设计

本设计用于电能计量终端的人机交互,对直流电和单相、三相交流电的电参数进行实时显示。基于μCOS的预定义UI交互设计的特点是预定义一个菜单数组,由程序解析菜单定义。菜单项为菜单数组中的一个结构体,通过设置菜单数组就能改变菜单组合形式。菜单项的可响应按键集也以结构体的形式定义,结构体的每一元素对应一个可以响应的按键,通过按键响应动作来实现菜单切换。该设计易于实现多层次菜单,而且具备很好的可移植性,适用于大量中等规模的嵌入式系统应用。运用该设计很好地完成了电能计量终端电参数的实时显示。     

低聚壳聚糖芳香醛席夫碱中酚羟基的抑菌活性研究

以低聚壳聚糖为对象,以苯甲醛、水杨醛、3,4-二羟基苯甲醛为改性试剂,设计合成了一系列含不同酚羟基的O-季铵盐低聚壳聚糖席夫碱衍生物,并对其结构进行了红外光谱或1 H NMR表征。通过抑菌圈法研究其对大肠杆菌和金色葡萄球菌的抑菌活性,结果表明,合成的各种低聚壳聚糖衍生物抑菌活性明显增强,抑菌活性大小依次为3,4-二羟基苯甲醛改性物水杨醛改性物苯甲醛改性物低聚壳聚糖。抑菌活性构效关系分析表明,低聚壳聚糖经席夫碱结构引入的酚羟基对其抑菌活性有一定贡献;其中空间位阻效应对酚羟基抑菌活性影响较大,空间位阻效应较小的间位和对位酚羟基抑菌活性较强。