显像（示）管阴极像黑洞状缺陷形成的原因及消除对策

本文通过有关理论依据和试验数据，着重阐述了在显像（示）管测试中，阴极像中心黑洞状缺陷产生的原因以及消除这种缺陷的处理方法。通过这种处理方法处理过的显像（示）管，其整体质量水平（尤其是真空度）将会得到明显的提高。     

C2（a 3Πu）+NO 的反应机理研究

在G2 (CC ,MP2 )理论水平上研究了C2 (a3 Πu)自由基与NO分子的反应 .计算了反应体系最低二重态势能面上各驻点的构型参数、振动频率和能量 ,揭示了此反应存在两种反应机理 :由NO中的O原子进攻C2 自由基形成CCON中间体的CCON机理和NO中的N进攻C2 自由基形成CCNO中间体的CCNO机理 ,分析了对应与这两种反应机理的五个可能的反应通道 ,得出了由NO中的N原子进攻3 C2 自由基 ,生成中间体CCNO自由基 ,最终得到产物CN +CO的通道是最有利的通道 .     

A MINI MULTI-GAS DETECTION SYSTEM BASED ON INFRARED PRINCIPLE

To counter the problems of gas accidents in coal mines, family safety resulted from using gas, a new infrared detection system with integration and miniaturization has been developed. The infrared detection optics principle used in developing this system is mainly analyzed. The idea that multi gas detection is introduced and guided through analyzing single gas detection is got across. Through researching the design of cell structure, the cell with integration and miniaturization has been devised. The way of data transmission on Controller Area Network (CAN) bus is explained. By taking Single-Chip Microcomputer (SCM) as intelligence handling, the functional block diagram of gas detection system is designed with its hardware and software system analyzed and devised. This system designed has reached the technology requirement of lower power consumption, mini-volume, big measure range, and able to realize multi-gas detection.     

Design of highly active heterogeneous palladium catalysts for the activation of aryl chlorides in Heck reactions

In situ generation of highly active palladium species by intermediate dissolution of Pd from solid supported catalysts has been demonstrated to be a very successful approach for the activation of aryl chlorides in Heck reactions. The new ‘heterogeneous’ Pd catalysts act as reservoir for molecular Pd species with unsaturated coordination sphere in solution. Crucial Pd leaching and re-deposition onto the support can be controlled by optimization of reaction conditions and by the properties of the catalysts. Pd is re-deposited onto the support at the end of the reaction. The catalysts, palladium supported on activated carbon, on various metal oxides or fluorides and Pd complexes in zeolites, are easy to prepare, though the preparation conditions are crucial. The catalysts convert all aryl bromides completely within minutes (TON 100,000). Aryl chlorides (even deactivated ones) are converted with high yields, within 2-6 h. The catalysts belong to the most active ones in Heck reactions at all (including best homogeneous systems) and fulfill all relevant requirements for practical applications in laboratory and industry.     

Applicability of medium-size basis sets in calculations of molecular dynamic polarisabilities

Static and dynamic average polarisabilities and polarisability anisotropies of seven linear non-polar and polar molecules are calculated within the CCS, CC2, and CC3 approximations using a range of medium-sized basis sets: the polarised LPol-n (n = ds, dl, fs, fl), the aug-pc-n (n = 1, 2), the def2-SVPD, and -TZVPD basis sets. Reference values are obtained using a hierarchy of Dunning's (d-)aug-cc-pVXZ (X = D, T, Q, 5) basis sets. The results are discussed together with the available CCSD values in terms of basis set and correlation method errors, and their ratio. Detailed analysis shows that already the def2-SVPD basis set can be used in CCS polarisability calculations. When affordable, the slightly larger aug-pc-1 basis set is recommended, as it leads to significant reduction of basis set error. The def2-TZVPD, LPol-ds, and aug-pc-2 basis sets are optimal choice within the CC2 approximation, with the latter allowing to approach the CC2 basis set limit. The LPol-ds, -dl, and def2-TZVPD sets outperform the aug-cc-pVTZ set in average polarisability CCSD calculations, with the def2-TZVPD being competitive to other reduced-size sets also in determination of polarisability anisotropy. The aug-pc-2 basis is a particularly attractive choice for CCSD, giving the accuracy of aug-cc-pVQZ at a significantly reduced computational cost. The polarisability anisotropy is shown to be more computationally demanding than the average polarisability, in particular with respect to the accuracy of the correlation method and an accurate evaluation of this property requires at least the CCSD model.     

基于无线传感器网络的温室大棚温湿度监控系统研究

文章提出了一种基于CC2530和SHT75温湿度传感器的温湿度实时监控系统的实现方案。文中阐述了系统的总体设计,包括硬件设计以及软件设计方法。通过SHT75芯片对温湿度数据进行采集,并利用ZigBee技术对采集来的数据进行传输,实现了温室大棚温湿度的实时多点检测。     

基于ZigBee与安卓的智能远程监控系统的设计

随着中国经济与社会的快速发展,环境监测引起人们的广泛关注。为了解决目前监控系统的不足,设计一种基于ZigBee和因特网的智能远程监控系统。该系统采用TI公司的CC2530芯片及相应传感器构建ZigBee局域网,将采集到的温湿度信息,经过上位机存储并处理,利用因特网或无线移动网络,在安卓智能手机终端上实现数据的远程传输。通过上位机与手机终端,可以查看当前环境状态,保存历史数据,并进行自动报警。给出系统硬件及软件实现方法,包括节点设计、组网流程、数据传输功能、上位机软件设计、安卓智能手机终端软件设计等。实验测试结果说明该系统工作稳定、容易扩展、上位机及手机操作简便。     

基于ZigBee的煤层气录井红外甲烷监测系统设计

针对传统煤层气录井系统中采用老式传感器和有线网络对煤层气甲烷含量进行监测实时性差和精度不高等问题,该文设计一种红外甲烷技术和ZigBee无线传输技术相结合的新型煤层气甲烷监测系统。该系统以MSP430F449单片机和CC2430芯片为核心,采用ZigBee无线通信协议。其可实时采集传输甲烷含量数据,具有稳定性高,拓展能力强,精度高,实用性强等优点。     

Ugi three-component coupling reaction for the synthesis of 2-(6-oxo-11-phenyl-7,8-dihydrobenzo[b]pyrrolo[1,2-d][1,4]diazocin-5(6H)-yl)-2-phenylacetamide derivatives

A three-component, four center Ugi reaction of 3-(1-(2-aminophenyl)-5-phenyl-1H-pyrrol-2-yl)propanoic acid with aromatic aldehyde and t-butyl isocyanide has been achieved to produce a novel class of N-tert-butyl-2-(6-oxo-11-phenyl-7,8-dihydrobenzo[b]pyrrolo[1,2-d][1,4]diazacine-5(6H)-yl)-2-phenylacetamides in moderate to good yields.     

25FS管莫尔条纹的成因及对策

本文详细介绍了技术质量部对用户厂家反映我公司25FS管莫尔条纹的问题进行的深入探究,发现其产生的三大主要物理原因,并作了适当的数学说明,并提出了相应的对策.