无线传感低功耗射频采集和管理系统优化设计

本文设计了一种可实现多射频源复合式能量采集的集成充电电池系统,重点分析了该系统中升压电路和智能管理电路的设计。通过仿真和实验比较了升压电路中普通二极管和肖特基二极管对输出电压的影响,同时讨论了整个系统的转化效率与输出功率。仿真结果表明利用多射频进行能量收集实现了对集成微充电电池充电,实现方案有效可行。     

无源RFID标签用材料研究进展

射频识别(RFID)是一种非接触式的自动识别技术,它是物联网的核心技术。该技术通过射频信号自动识别目标对象并获取相关信息数据,该识别工作不需要人工干预,RFID标签可在各种恶劣环境中工作。RFID的应用非常广泛,尤其是在服装、资产管理等方面的应用最为成熟。RFID标签是RFID技术中必不可少的重要组成部分。随着新材料、新工艺的出现与发展,RFID标签的新产品不断地涌现出来,就近年出现的一些与新材料密切相关的RFID标签新产品与新制造工艺、方法进行了总结。新材料的发展与新工艺的出现为物联网核心技术RFID标签产业提供了新的技术方向和新的经济增长点。     

射频识别(RFID)标准化发展思路研究

射频识别(简称"RFID")技术被番为最具发展潜力和变革力的信息高新技术之一.随着RFID技术的发展,RFID应用规模的不断扩大,RFID标准的作用和战略地位日益显现,RFID标准成为影响RFID技术应用和产业发展的重要因素.本文在分析RFID标准化现状和挑战的基础上,探讨了RFID标准化发展思路和RFID标准化研究政策性建议.     

超高频无源电子标签芯片的电路设计

电子标签芯片是无线射频识别(RFID)技术的核心,其模拟电路的设计十分关键.它分为电源产生电路、调制解调电路以及上电复位模块等模块.设计结果表明,设计的电路具有很高的整流效率,满足了设计需求.     

务实中演进的射频识别技术

射频识别（RFID）技术是一种非接触的自动识别技术,它通过射频信号自动识别目标对象并获取相关数据,并通过后台网络使得物品跟踪和信息共享可以在更大范围乃至全球范围进行。经过多年的发展,RFID技术在芯片、读写器、天线、标签封装、服务软件等环节的关键技术上都取得了扎实的进展,RFID产品进一步向小型化、实用化、     

Design and implementation of an ultra low power baseband for UHF RFID tags

依据EPC C1G2协议设计了一种用于无源UHF射频识别RFID标签芯片的数字基带电路,在完成协议规定功能的前提下实现了系统的低功耗.通过引入系统时钟规划、状态优化编码、全局钟控、异步计数器、门级功耗优化与操作数隔离等多种低功耗技术,设计最终功耗为13.8μW.为更好地实现系统的防冲突,采用了一种基于振荡器采样的真实随机数产生器,整个随机数产生电路功耗控制在2μW以内.设计采用Chartered0.18μm工艺实现,数字电路面积为482μm×480μm,芯片测试结果与仿真结果基本符合.     

基于ARM和RFID技术的嵌入式系统研究

分析研究基于ARM微处理器和射频识别(RFID)技术的嵌入式系统。详细分析介绍射频识别模块和其核心芯片MFRCS00的结构,以及ARM的核心芯片LPC2200的结构和特点,并分析设计RFID和ARM的相关接口电路。     

RFID射频读写器的设计

文中设计了基于单片机C8051F310和射频读写芯片FM1702SL的射频读写器,其工作频率为13.56MHz,实现了阅读器与标签的读写通信。文中重点介绍了该读写器的硬件和软件设计。     

射频ICP离子源设计研究

本文介绍了射频 (RF)感应耦合等离子体 (ICP)离子源的设计研究。对RFICP的结构、离子流的引出以及离子流的均匀性、中性化和射频匹配网络进行了研究。     

射频识别技术在军品包装上的应用探讨

射频识别(RFID)技术的正在得到越来越广泛的应用.就射频识别技术在现代军品包装中的发展、应用和技术优势进行了探讨,并对该技术应用的前景进行了分析,指出了该技术应用的重大意义.     

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.……     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

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.……     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

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.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from