32位和8位单片机的无线传感器网络系统

采用STM32F10X系列的芯片为主芯片、SH79F32为辅芯片,温度传感器DS18B20做采集工具,PTR8000无线模块做通信工具,实现无线传感器网络功能。通过Altium Designer Release 10进行原理图设计及PCB板的绘制,并制作电路板、焊接电路板,之后利用Keil软件设计程序,实现不同单片机之间的无线传感器网络通信,并完成了无线通信平台的设计与制作。     

Effects of coating thickness and residual stresses on the bond strength of ASTM C633-79 thermal spray coating test specimens

Wire-arc-sprayed nickel-aluminum is widely used in the aircraft industry for dimensional restoration of worn parts and as a bond coat for thermal barrier coatings and other top coats. Some repair applications require thick coatings, which often result in lower bond strength. A mechanism being investigated to ex-plain this decrease in bond strength is the free edge effect, which includes both coating residual stresses and coating thickness. The layer-removal method was used to determine experimentally the residual stresses in wire-arc-sprayed nickel-aluminum coatings of different thicknesses. Bond strength evalu-ations were performed using an improved ASTM C 633-79 test specimen. Finite-element analysis and fracture mechanics were used to investigate the effects of coating thickness and residual stress state on coating bond strength.     

基于W79E834的磁力启动器智能保护装置的设计

文章介绍了一种基于W79E834的磁力启动器智能保护装置的设计方案,详细阐述了该装置硬件、软件设计及其保护功能的实现。该装置具有短路、过流、断相、漏电闭锁等保护功能和电能计量功能。装置已在某煤矿实际运行,现场运行结果表明,该装置克服了煤矿现有模拟保护装置精度不高、易失效和无法进行电度计量等问题,实现了小型隔爆开关的智能化和数字化。     

Controller synthesis with guaranteed closed-loop phase constraints

In this paper, we present an analysis and synthesis approach for guaranteeing that the phase of a single-input, single-output closed-loop transfer function is contained in the interval [−α,α] for a given α>0 at all frequencies. Specifically, we first derive a sufficient condition involving a frequency domain inequality for guaranteeing a given phase constraint. Next, we use the Kalman–Yakubovich–Popov theorem to derive an equivalent time domain condition. In the case where , we show that frequency and time domain sufficient conditions specialize to the positivity theorem. Furthermore, using linear matrix inequalities, we develop a controller synthesis approach for guaranteeing a phase constraint on the closed-loop transfer function. Finally, we extend this synthesis approach to address mixed gain and phase constraints on the closed-loop transfer function.     

79Se半衰期计算

介绍了用log ft系统学计算⁷⁹Se半衰期的方法。根据系统学计算和与实验测量数据的比较，推荐了⁷⁹Se的半衰期。给出了⁷⁹Se衰变纲图并计算得到了⁷⁹Se辐射数据。      

Se在北山花岗岩地下水中的化学形态及浓度控制分析

利用地球化学模拟软件GWB(Geochemist’s Workbench),研究了Se在我国高放废物预选场址北山花岗岩地下水中的化学形态及浓度控制因素。结果表明,Eh和pH对Se的化学形态影响较大,在处于弱碱性的北山花岗岩地下水中,溶解态的Se主要以SeO32-、HSeO3-和HSe-的形式存在。北山花岗岩地下水属于高矿化水,在保持地下水组分不变的情况下,当固定Eh为0mV,pH在5～12之间变化时,Se浓度主要受Se(0)、CuSe2、Cu3Se2或CuSe等矿物的沉淀所控制;当固定pH为7.56,硒浓度随Eh变化则主要受FeSe2、Se(0)、CuSe2、Cu3Se2或CuSe等矿物的沉淀所控制。与Fe2+相比,Cu2+更易与Se反应形成沉淀。从本文的模拟结果来看,由于Se在北山花岗岩地下水中易形成硒-矿物沉淀,使得溶液中的Se浓度能维持在较低水平,因此有利于阻滞对氧化还原条件敏感的核素79Se的迁移。     

仓鼠V79细胞对加速碳离子的辐照致死效应

分别测定了传能线密度（LET）为125．5、200、700keV／μm碳离子辐照仓鼠V79细胞的存活曲线,由存活曲线确定了上述3种碳离子辐照时V79细胞的失活截面依次为7．86±0．17、10．44±1．11、32．32±3．58μm2。以V79细胞对60Coγ射线的存活响应为参考值,给出了对应于上述3种碳离子照射周％、20％、50％、80％存活水平下的相对生物学效应（RBE）,结果表明125．5keV／μm碳离子的RBE值在各个存活水平下都为最大。提示：以存活为生物学终点的RBE最大值在LET值小于200keV／μm的碳离子辐照时出现。     

Do vertical tax externalities lead to tax rates being too high? A note

When both vertical and horizontal externalities are at work in a federation, they generally distort levels of taxation in opposite directions. This article is an extension of the Keen and Kotsogiannis (Am Econ Rev March: 363–370, 2002) model. It focuses on state tax policy when states provide an industrial public good increasing firms’ marginal productivity rather than a residential public good intended to households. We find that some results related to whether equilibrium state taxes are likely to be too high or too low are much more complex when state-provided industrial public goods are considered. First, we show that in the presence of industrial public goods, a dominant vertical externality may result in state tax rates being too low (and not too high as it is the case with residential public goods). Second, we find that under certain conditions, horizontal and vertical externalities may point in the same direction and reinforce each other towards tax rates being too high or too low.     

发输电系统可靠性评估在DIgSILENT软件上的应用

介绍了DIgSILENT软件的主要功能及特点,以及其作为仿真工具进行可靠性评估时的具体方法和步骤。以RTS-79测试系统为算例,运用FMEA法对预想事故进行分析,在DIgSILENT平台上搭建电力网络,设置相关参数进行仿真分析,通过系统侧和负荷侧一系列指标的对比计算来评估该发输电系统的可靠性。     

Measurement of 76Se and 78Se (γ, n) Cross Sections

The (γ, n) cross sections of Se isotopes (⁷⁶Se,⁷⁸Se) were measured to supply fundamental data for estimating the inverse reaction cross section, i.e., the ⁷⁹Se(n, γ)⁸⁰Se cross section. The enriched samples and a reference ¹⁹⁷Au sample were irradiated with laser-Compton scattering (LCS) γ-rays. The excitation function of each (γ, n) cross section was determined for the energy range from each near neutron separation energy to the threshold energy of (γ, 2n) reaction. The energy point corresponding to each cross section was deduced using the accurately determined energy distribution of LCS γ-rays. Systematic (γ, n) cross sections for Se isotopes including ⁸⁰Se were compared with those calculated by using a statistical model calculation code TALYS.