NSA3142A电机差动保护在变电所中的应用

以南京电研的NSA3142A保护装置为例,介绍差动保护装置的调试内容、步骤、方法及如何判断试验结果的正确性．     

马奶及其制品中肠球菌属乳酸菌的安全性评价

目的：为使具有民族特色和特殊功效的马奶及其制品中的有益乳酸菌应用于食品发酵工业,确保分离自内蒙古牧区靠自然发酵制作的马奶及其制品中的乳酸菌的安全性,对分离自马奶及其制品中的乳酸菌进行安全性评价。方法：通过吲哚实验、硝酸盐还原酶实验、氨基脱羧酶实验、溶血实验、D-乳酸检测及质粒提取实验,确定菌株是否含有有害代谢产物及有无耐药性。结果：菌株的吲哚实验、硝酸盐还原酶实验、氨基脱羧酶实验、溶血实验均为阴性,在菌株JHZ9、JHZ15、JHZ25、JNN1中检出了少量的D-乳酸,菌株对实验所选药品无耐药性且未检测到可转移的耐药质粒。结论：7 株肠球菌属的乳酸菌在代谢活动中不产生有害代谢产物,不存在可转移的耐药质粒。     

焦炉集气管压力模糊控制系统

针对焦炉集气管压力的强耦合、多变量、参数时变的特点 ,在进行系统特性分析的基础上 ,提出了一种模糊控制器 ,实现焦炉集气管压力的自动控制。实验结果表明 ,在推焦装煤期间 ,集气管压力控制在 ( 80± 1 0 )Pa内 ,吸力管压力控制在 ( 1 50 0± 1 0 0 )Pa内。系统主要技术指标优于原指标 ,具有良好的动态和静态特性     

超临界萃取技术结合超声强化技术提取鹿茸中性激素和IGF-1

Supercritical CO2 (SC-CO2) extraction technology and ultrasonic technology were used to extract two active sex hormones, estradiol and progesterone, and insulin-like growth factor-1 (IGF-1) from antler velvet. The effects of SC-CO2 extraction condition on the extraction yield and content of sex hormones, the ultrasonic extraction condition on the content of IGF-1 and the SC-CO2 extraction condition on the activity remaining of IGF-1 were studied. The optimal conditions were obtained. The experimental results showed that, in presence of 75% ethanol as the co-solvent, the mean yield and content of estradiol and progesterone were 87.67 pg•g－1 and 1224.10 pg•g－1, 12.38 ng•g－1 and 354.06 ng•g－1, respectively, with extraction pressure of 30 MPa, temperature of 35°C, extraction time of 30 min and CO2 consumption of 15 L•g－1 at the flow rate of 2.0 L•min－1. The highest content of IGF-1 was 7425.75 ng•g－1 antler velvet residue, when the pH10 ammonia-ammonium chloride buffer solution was used as the solvent, the ratio of solvent to sample was 20/1 (volume/mass), the extraction temperature was 0-35°C, and the ex-traction time was 4×15 min. Under these conditions, 93.68% activity remaining of IGF-1 in the residue was ob-tained, while little IGF-1 activity exists in traditional residue. The experimental results indicate that the technology of SC-CO2 with co-solvent is of advantage for getting high content sexual hormones and keeping high activity of IGF-1 in the residue, which can not be achieved by traditional extraction methods.     

乳酸菌对喹诺酮类耐药性主动外排机制的研究

目的：为使分离自具有民族特色和特殊功效的内蒙古牧区马奶及其制品中的乳酸菌更好地应用于发酵工业,对乳酸菌进行耐药性实验并研究其中是否存在由主动外排蛋白介导的喹诺酮类耐药机制。方法：采用二倍稀释法测定乳酸菌对临床常用喹诺酮类药物的最小抑菌浓度（minimum inhibitory concentration,MIC）,利用质子泵抑制剂（利血平）结合荧光分光光度法检测耐药菌株和对照菌株对环丙沙星的摄取情况。结果：菌株HZ18、HZ28、NN3、NN4具有耐药性并在加入利血平后菌体内环丙沙星累积量明显增加。结论：乳酸菌中存在主动外排蛋白介导的喹诺酮类耐药机制。     

MgAl2O4掺杂对ZTA-MgAl2O4复相陶瓷力学及热学性能的影响

以Al_2O_3、Zr O_2、MgO为初始粉末,采用放电等离子体烧结(SPS)制备ZTA-MgAl_2O_4复相陶瓷,研究MgAl_2O_4掺杂对ZTA-MgAl_2O_4复相陶瓷微观结构,力学及热学性能的影响。结果表明:ZTA-MgAl_2O_4复相陶瓷物相包括α-Al_2O_3、t-Zr O_2和MgAl_2O_4,烧结过程中MgO与Al_2O_3完全反应生成MgAl_2O_4;随MgAl_2O_4添加量增加,复相陶瓷Vickers硬度由21 GPa逐渐降低至17.5 GPa;而断裂韧性及抗弯强度呈现先增大后减小的趋势,当MgAl_2O_4添加量为15%(体积分数)时,断裂韧性和弯曲强度达到最大值,分别为8.55 MPa·m~(1/2)和1 056 MPa;此外,相同测试温度下复相陶瓷热导率随MgAl_2O_4添加量的增加逐渐减小,如温度为50℃时复相陶瓷热导率由18.5 W/(m·K)逐渐降低到14.3 W/(m·K)。     

一种新的绿色化学技术：超临界萃取作为样品制备技术在痕量药检分析中的应

综述了超临界萃取作为样品技术在痕量药检分析中的应用。研究了生物基质对有效萃取目标检测物的影响及提高萃取率的途径。并重点评述了减少类脂杂质、选择性的分离目标检测物的非在线吸附剂收集与在线吸附收集技术。从而展示了ＳＦＥ作为绿色化学技术具有萃取率高、使用溶剂少,分离步骤少,环境无害等明显优于传统方法的特点。     

FC系列超小型调节器在原油稳定装置中的应用

本文主要介绍日本富士最新FC系列超小型调节器在原油稳定装置系统中的应用。文中从控制系统的组成原理、系统组态及参数设定等方面做了论述。     

基于蓝牙通信的电子相框设计

随着人们生活水平的日益提高,以数字化为代表的消费类电子产业正呈现高速增长的趋势.本文旨在设计一种新型的具有蓝牙通信功能的电子相框,实现从手机、PC机、PDA等具有蓝牙功能的任何设备向电子相框发送图片,并可即时显示.同时还可以选择播放不同的背景音乐等功能.从而改变原来图相单一的相框,给消费者带来时尚和享受.     

川芎油在超临界二氧化碳中溶解度的测定与关联

Extraction of the Ligusticum Chuanxiong oil with supercritical CO2 （SC-CO2） was investigated at the temperatures ranging from 55℃ to 70℃ and pressure from 25 MPa to 35 MPa. The mass of Ligusticum Chuanxiong oil extracted increased with pressure at constant temperature. The initial slope of the extraction was considered as the solubility of oil in SC-CO2. Chrastil equation was used to correlate the solubility data of Ligusticum Chuanxiong oil. An improved Chrastil equation was also presented and was employed to correlate the solubility data, The correlation results show that the values of the average absolute relative deviation are 5.94% and 3.33% respectively, indicating the improved version has better correlation accuracy than that of Chrastil equation.