某型压缩空气站自动监控报警器系统设计

针对某型压缩空气站日常维护保障需求,设计开发了一款压缩空气站自动监控报警器;该自动监控报警器系统通过信号隔离变送器,实时采集滑油压力信号、水温油温信号、转速信号、压缩空气压力等信号,由系统微型控制器模块进行ADC采集、转换并处理。系统微型控制器采用STC12单片机,运行嵌入式控制程序,对采集到的各类信号进行显示、阈值判断和报警等处理;该自动监控报警器能实时监控压缩空气站的多个关键运行参数并自动报警,有利于压缩空气站的安全运行与操作。     

一种多元高浓度复合液肥的生产方法

介绍了一种新型多元高浓度复合液肥的研制方法及其大面积田间应用的情况     

A Solar‐Blind UV Detector Based on Graphene‐Microcrystalline Diamond Heterojunctions

An ultraviolet detector is demonstrated through a whole‐wafer, thin diamond film transfer process to realize the heterojunction between graphene and microcrystalline diamond (MCD). Conventional direct transfer processes fail to deposit graphene onto the top surface of the MCD film. However, it is found that the 2 µm thick MCD diamond film can be easily peeled off from the growth silicon substrate to expose its smooth backside for the graphene transfer process for high‐quality graphene/MCD heterojunctions. A vertical graphene/MCD/metal structure is constructed as the photodiode device using graphene as the transparent top electrode for solar‐blind ultraviolet sensing with high responsivity and gain factor. As such, this material system and device architecture could serve as the platform for next‐generation optoelectronic systems.     

Effect of Yarn Distortion on the Mechanical Properties of Fiber-Bar Composites Reinforced by Three-Dimensional Weaving

A meso-structure model of fiber-bar composites reinforced by three-dimensional weaving (FBCR3DW) is proposed. Optical microscopy images of the preform structure revealed that the fibers along the circumference of the yarn cross-weave were twisted randomly due to alternating yarn winding on either side of the fiber bars during the manufacturing process. Sections of the cross-woven yarn were divided into five regions based on the twist characteristics. Stochastic function theory was used to describe the twist characteristics and to calculate the compliance tensor for each twisted yarn region. The twist characteristics and compliance tensor of each region were then introduced into a finite element model to calculate the elastic properties of the twisted yarn and FBCR3DW; unidirectional tensile stress–strain curves were generated based on the Tsai–Wu failure criterion. Several FBCR3DW specimens with randomly twisted yarns inside the weave structure were used in experimental tests. Our numerical results were in good agreement with the experimental values. Yarn distortion had a significant effect on the elastic properties and axial tensile strength of the yarn; specifically, the influence of yarn distortion on the transverse elastic modulus and transverse shear modulus of FBCR3DW was severe, whereas only a slight effect occurred with regard to the other elastic constants and unidirectional tensile properties. Thus, the proposed method provides an effective reference for modeling fiber composites with a weave structure.     

无线局域网入侵防范系统的研究

针对无线局域网当前存在的安全问题,本文提出了一种无线局域网入侵防范系统的设计方案并给出了系统的实现方法。该系统能够提供对无线局域网的实时监控和保护,大大提高了网络的安全性。     

基于OSEK/VDX的电动助力系统设计

详细分析电动助力转向系统（EPS）的原理及其工作流程,采用PIC18F458单片机作为控制器,通过其增强型的PWM脉宽调制模块ECCP控制助力电机,实现EPS系统的助力控制、回正控制、阻尼控制等方式。应用软件采用OSEK OS嵌入式操作系统为平台,将EPS系统进行多任务划分,通过优先级调度达到系统协调运行的目的。     

风冷热泵冷水机组在东宇大厦中的应用

文中从设计角度介绍了风冷热泵冷水机组在国内工程中的应用，认为与常规空调方式相比，风冷热泵冷水机组约可减少投资２５％，这种机组尤其适合在我国东经１０５°～１２５°、北纬２７°５０′～３２°５０′的地域内使用