MC146818掉电保护的一种设计方法

本文介绍实时时钟／日历芯片ＭＣ１４６８１８掉电保护电路的一种简单，方便的设计方法。     

基于M68HC908Q系列单片机掉电保护系统的设计与实现

介绍一种由电源监控芯片MAX708和串行E~2PROM AT24C02构成的低成本、高可靠性的掉电检测和保护电路。在软件上，通过对现场数据的保护实现了上电后现场数据的恢复。同时对E~2PROM存储区的循环写入增加了可擦写次数，特别适用于数据更新频繁的智能仪表的数据掉电保护。     

在LonWorks中X24C45的掉电保护

为了避免数据保存过程中因系统掉电或不稳定可能导致的保存位不正确，采用备份数据和置标志位相结合的方法，消除了保存数据时的错误，保证了保存数据的准确性；同时给出了在LonWorks节点中，保存器在保存数据时掉电或电压不稳情况下保护和恢复数据的应用实例。     

基于FPGA的增强型MC8051的设计

通过对Oregano Systems公司提供的完整MC8051VHDL代码进行修改,增加PLL锁相环功能,将内部RAM扩大到256B,将定时器、串口和外部中断等资源扩大一倍,增加乘法器和除法器以得到增强型的51核.     

MC/ServiceGuard与Oracle RAC方案的设计

在不锈钢分公司的产销系统成功运用MC/ServiceGuard集群实现了高可用性系统设计的基础上,着重从产销系统的特点、系统的硬件环境的设计、网络环境的设计、共享存储的设计、Oracle RAC卷组的设计、MC/SC-Oracle集群的设计和集群文件生成与配置等方面,介绍了MC/ServiceGuard集群系统的设计方法和系统文件配置.     

高钒高速钢中MC碳化物的定量分析方法

采用扫描电子显微镜+金相分析软件相结合的试验方法,对高钒高速钢中的MC碳化物进行了定量分析。结果表明,通过黑白反转、彩色灰度化及图像分割操作,可准确测量任一类型碳化物的百分含量,且所有碳化物体积之和与未进行图像提取操作的碳化物体积一致。该实验方法可以准确检测高钒高速钢中MC碳化物的面积分数,以及其颗粒大小、个数等,能够满足定量分析的需求。     

一种新的保护渣熔化速度的检测方法

利用碳烧损量是控制保护渣熔化速度的关键因素这一原理,用失重法检测了不同温度下保护渣的烧损量并尝试用于比较其熔化速度.研究表明,以碳烧损反映保护渣熔化速度的最佳温度是1300℃,保护渣的熔化速度与渣中自由碳含量的烧损速度成正比.提出了以保护渣烧损曲线最后一个拐点对应的时间来表征其熔化速度的新方法.与传统检测方法相比,新方法能定量地区分不同保护渣的熔化速度的差别.     

一种结晶器保护渣的检测工具及其检测方法

本发明步及一种结晶器保护渣的检测工具及其检测方法，解决现有技术不能准确测量板坯连铸机结晶器保护渣的液渣层、烧结层、粉渣层厚度的技术缺陷。一种结晶器保护渣的检测工具及其检测方法，由铜管、木夹、木板或石棉板、铁钉、镀铜铁丝组成，铜管内穿有镀铜铁丝或长度相同的一根铜丝和一根铁丝，铜管是检测工具的操作手柄，木夹通过铁钉固定在木板或石棉板上，木板中心钻有通孔，镀铜铁丝或长度相同的一根铜丝和一根铁丝从铜管穿出后，用木夹固定，再从木板中心孔中穿出，检测时，浇钢工用手握住铜管，将穿出木板的镀铜铁丝或长度相同的铜丝和铁丝插入结晶器钢水中，并使木板漂浮在结晶器钢水液面上，保持平稳，4s后将镀铜铁丝或铜丝和铁丝取出，根据插入钢水端的镀铜铁丝或铜丝和铁丝熔损和颜色的变化来确定保护渣的液渣层、烧结层、粉渣层厚度。本发明检测工具的使用寿命达浇注600炉钢水以上。     

一种新型保护渣的试验研究分析

介绍了唐钢电炉炼钢厂在浇注２８ＭｎＳｉＢ时采用一种新型微碳保护渣，该保护渣在提高成材率及防止增碳方面有重要意义。     

一种不锈钢退火保护内罩

专利号：200410061304．5 专利权人：武汉钢铁（集团）公司 本发明涉及一种用于环行退火炉的不锈钢退火保护内罩,属于大型退火炉的退火配套构件。包括有一筒状的罩体,罩体由封头和简体焊接而成,其特征在于所述的罩体由高铬镍基耐热合金钢制成,     

金电解电源装置的优化设计与应用

详细介绍金电解电源装置整流回路的串联电路、并联电路及串并混合电路等不同的电路设计形式、波形及特点，通过分析，优选出最佳的电路形式，并经生产实践证明，采用这种串、并联混合电路形式的电源装置，可以很好地解决金电解生产中的阳极钝化现象，并且电解速度快。与普通的可调恒流或恒压的电解电源相比，能取得更好的经济效益。     

我国发电设备用钢材概述

本文针对我国发电设备用钢材的现状，对电力工业用钢材的质量，品种，数量和生产工艺的改进和发展提出了建议。     

电力系统潮流计算程序设计

牛顿-拉夫逊潮流计算是一种有效的潮流计算方法。通过MATLAB语言对其编程，并对一道例题进行计算和验证，以证明设计程序的正确性。     

Wedge Failure Analysis of Soil Resistance on Laterally Loaded Piles in Clay

A fundamental study of pile-soil systems subjected to lateral loads in clay soil was conducted by using experimental tests and a lateral load-transfer approach. The emphasis was on an improved wedge failure model developed by considering three-dimensional combination forces and a new hyperbolic p-y criterion. A framework for determining the p-y curve on the basis of both theoretical analysis and experimental load test results is proposed. The proposed p-y method is shown to be capable of predicting the behavior of a large-diameter pile under lateral loading. The proposed p-y curves with an improved wedge model are more appropriate and realistic for representing a pile-soil interaction for laterally loaded piles in clay than the existing p-y method.     

核电锆管工艺方案的研讨

本文推出锆锡合金管的两套典型工艺方案,给出相关的主要设备与工艺参数,归纳了当前尚待进行科研开发的课题,希望以此引起企业界对振兴锆工业若干技术问题的关注。     

微机型综合保护装置在供电系统中的应用及发展

通过对微机型综合保护装置应用实践的总结，阐述了综合保护装置具有的强大功能和技术特点及其在供电系统中的作用和影响，对实际应用的综保装置之特点进行说明。井对综保装置的改进提出相应建议。     

Failure Mode Analyses of Reinforced Concrete Beams Strengthened in Flexure with Externally Bonded Fiber-Reinforced Polymers

As existing structures age or are required to meet the changing demands on our civil infrastructure, poststrengthening and retrofitting are inevitable. A relatively recent technique to strengthen reinforced concrete (RC) beams in flexure uses fiber-reinforced polymer (FRP) strips or sheets glued to the tension side of the beam. A number of researchers have reported that the failure mode of an FRP-strengthened RC beam can change from the desired ductile mode of an underreinforced beam to a brittle one. This paper analyzes the effects of this strengthening technique on the response and failure modes of a reference RC beam. A nonlinear RC beam element model with bond-slip between the concrete and the FRP plate is used to study how the failure mechanism of simply supported strengthened RC beams is affected by the following parameters: plate length, plate width, plate stiffness, and loading type. The beam geometry is kept constant. The parametric studies confirm the experimentally observed results according to which the most commonly observed failure modes due to loss of composite actions are affected by the plate geometric and material properties. In addition, distributed loads (difficult to apply in an experimental test) may not be as sensitive to plate debonding in the region of maximum bending moment as are beams subjected to point loads.     

电站锅炉一次风机叶片再制造技术及耐磨涂层性能研究

再制造技术具有优质、高效及环保的特点,电站锅炉一次机叶片的再制造具有十分显著的经济效益及节能、节材效果。本文在分析一次风机叶片的失效机理的基础上,制定了一次风机叶片的再制造工艺,采用两种超音速火焰喷涂工艺制备了微纳米WC-CoCr和微米WC-CoCr涂层,研究了四种涂层的孔隙率、力学性能和抗冲蚀磨损性能。结果表明:燃油型超音速火焰喷涂工艺制备的微纳米WC-CoCr涂层具有孔隙率低(0.26%)、显微硬度(1452HV_(0.2))和开裂韧性(4.41 Mpa·m~((-1/2)))高及抗冲蚀磨损性能优良的特点,能有效提高一次风机叶片的使用使命。     

Design and Construction Challenges of a Federal Laboratory Building: A Case Study

This paper presents a case study regarding design and construction challenges of a federal laboratory building. The case study illustrates the successful collaboration of two federal agencies, General Services Administration (GSA) and Centers for Disease Control and Prevention (CDC). Creative methods were used to resolve complex design, construction, and budgetary issues. This paper describes lessons learned from a specific laboratory project on issues such as: A master plan and its role in locating secure laboratory buildings, site planning issues, contracting mechanisms, building security, energy, project development, design and construction excellence, and funding. Although CDC and GSA approved the release of this paper, the authors offer a disclaimer that the opinions and conclusions drawn in the papers are those of the authors, and are not necessarily shared by the CDC and GSA.     

Classroom Assessment and Redesign of an Undergraduate Steel Design Course: A Case Study

The objective of this paper is to share experience gained in classroom assessment and subsequent redesign of an undergraduate, practice-oriented steel design course. A term project involving the design of a low-rise structural steel building was used to provide a summative evaluation of student learning. The essence of the project was for students to demonstrate their ability to apply the course material in a realistic activity, similar to structural engineering practice. Critical reflection on student performance, student feedback on course evaluation forms, the author’s observations as course instructor, and the educational literature motivated redesign of the course. Adaptation of an assignment-centered or project-based approach to course planning guided course redesign. Comparison of student performance and course evaluation data suggests that the redesigned course better meets the goal of developing the students’ abilities to apply the subject knowledge and skills to realistic problems or scenarios.