温湿度无线远程监测系统研制

针对传统温湿度监测效率低,智能化程度差的缺点设计了一种新型智能温湿度无线远程监测系统,实现温湿度数据的自动采集、显示、传输、保存、短信报警等功能。以STM32F103微控制器为控制核心,采用LED中英文点阵屏显示数据,以SHT75采集温湿度数据,通过APC320无线传输数据。基于Labview平台开发的上位机控制软件,具有设置参数、读取与显示数据、数据与图表分析、自动生成Excel报表、短信报警、远程访问等功能。经测试:该系统测试精度、效率、智能化程度均有较大提高。     

基于STM32F103微控制器的短信报警温湿度记录仪的设计

为提高温湿度监测的效率、精度和智能化水平,设计温湿度记录仪。以STM32F103为控制核心,采用SHT75实时采集温湿度数据并通过自主设计的LED中英文点阵屏显示,以24C512作为数据存储器,通过GTM900收发手机短信。基于LabVIEW平台开发的上位机控制软件实现系统设置和数据管理。经测试:记录仪的准确度为温度:±0.5℃,湿度:3%RH,记录容量为21 500组(可扩容),具有自动检测、记录数据并生成原始记录以及GSM短信远程设置,读取实时数据,自动报警等功能。     

基于ZigBee的客车环境监测实验系统设计

为更方便地获取客车车厢内部环境参数,设计基于ZigBee无线传感器网络的客车环境参数监测实验系统.整个实验系统主要由多个ZigBee无线采集模块、路由器、协调器以及上位机软件组成,协调器汇集系统中分布于空间不同位置的多个采集节点采集的车厢内部温湿度、CO浓度和气压等数据,并实时传送至上位车辆管理计算机,上位机程序采用LabVIEW编写.实验表明:所设计的无线传感器网络监测实验系统使用方便、性能良好,达到预期设计的要求.     

基于单片机的数据采集系统研究

本文针对普通测试仪表只能进行单参数测量的缺陷,特设计了一套综合数据采集系统通用平台.该平台建立了以51单片机为控制核心的多通道硬件系统,结合LabVIEW完成了上位机数据处理人机界面的设计,实现了数据采集、液晶显示和上位机数据处理等功能,只需更换该系统平台前端的传感器和前置放大就可以检测单参数和多参数物理量,方便用户根...     

多路温湿度变送器自动测量装置的研制

针对目前国内实验室校准温湿度变送器时,都需要用多台仪表及直流稳压电源进行组合测量的缺点,设计了一体化温湿度变送器自动测量装置。该装置电路系统基于STM32F103微控制器和ADS1256ADC芯片为核心研究设计多路信号采样测量控制系统;上位机应用程序采用LABVIEW开发平台与数据库技术设计实现。可以同时测量34路变送器,实现变送器自动供电、信号类型自动识别、自动数据处理与显示存储、无线数据传输、自动生成测量报告以及仪器自动校准等功能。该装置的电流、电压采样精度高达0.05%,具有测量效率高、成本低、智能化程度高等特点。     

基于Arduino和LabVIEW的叼纸牙压力检测系统研究

本研究旨在解决衡量胶印机叼纸牙工作性能的关键技术难题——咬力的准确检测问题。为此,设计基于LabVIEW与Arduino平台的无线压力检测系统。在方法上,系统采用上位机的LabVIEW软件进行数据处理,Arduino控制单元作为核心,压力传感器进行数据采集,最后通过ESP8266通信模块实现数据的无线传输。研究结果表明,该系统能够有效提高咬力检测的准确度,且具有成本低廉、便携性好的优点,对于印刷设备的数字化升级具有实际应用价值。结论是,本系统成功实现了研究目的,为叼纸牙压力检测提供了一种新的解决方案,并推动了传统印刷设备向数字化转型的进程。     

基于MSP430的空气环境质量监测系统设计

为了实现城市环境参数的分布式检测和集中统计管理,设计了一个空气环境质量监测系统。该系统分为上位机监控中心和下位机检测与传输终端两部分,下位机采用MSP430F149单片机作为控制核心,以温湿度传感器SHT11和PM2.5传感器进行数据采集。下位机有液晶显示,可以实时显示测量数据,并可手动设置报警值,检测数据同时通过Sim900无线模块传至监控中心。监控中心完成空气环境质量数据的统计管理,生成报表,便于管理部门做出决策。该系统已经在大学校园环境下进行了测试、应用,效果良好。     

无线大空间温湿度在线校准系统的设计

本文基于传感器技术和无线通讯技术,研制了一款无线大空间温湿度在线校准系统,采用无线数据传输模式采集多台从机数据,从机基于RF433协议无线发送信号至主机,主机通过USB联接发送至上位机进行数据显示、分析和处理.     

紫外线加速耐候试验机校准装置的设计

通过对紫外线加速耐候试验机老化原理的分析，针对紫外线加速耐候试验机的温度、湿度、紫外线中心波长和紫外线辐照度四个参数，设计了紫外线加速耐候试验机校准装置。装置采用STM32单片机为下位机核心，采集温度、湿度、紫外线中心波长和紫外辐照度四个参数，总共12个传感器模块的数据，通过USR-WIFI232模块进行无线数据传输以及各模块地址分配。将采集的数据发送到上位机LabVIEW2018软件开发平台，实现参数的多点实时在线显示、数据存储、生成表格等功能。此装置实现的技术指标，满足对于紫外线加速耐候试验机相关参数的校准要求。     

基于STM32的磁检测系统和扫描检测算法研究

结合电磁检测、传感器技术、信号处理和单片机技术,研究开发了一种基于STM32的磁检测系统.该系统主要包括上位机控制软件、下位机微控制器、磁传感器模块和机械运动平台等,其中上下位机间进行串口通信,完成运动参数和控制指令的设置及扫描位置信息和检测磁场信息的存储和实时显示;通过对扫描运动算法的研究,结合步进电机控制原理,实现了多参数可调节、点阵式、空间大区域的扫描运动;三维霍尔磁传感器实现对空间任意位置磁场矢量的检测,同时反映磁场的大小和方向信息.该系统的检测实验结果表明:磁场检测数据完整,能够展现磁场的空间矢量分布和平面云图分布;三维扫描式检测运行平稳、参数设置灵活多变;整个检测系统性能稳定可靠、效率高,能够实现对目标区域磁场的有效、快速检测.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.