精密弹簧片零件校平方法创新与应用

铁-镍-铬系奥氏体高弹性合金精密弹簧片是高精度传感器的重要零件,在加工过程中校平难度很大。通过对材料性能及加工工艺分析,使用自制校平机对上下两面采用两种不同硬度材料进行挤压成形的铁-镍-铬系奥氏体高弹性合金精密弹簧片进行校平,解决在校平过程中出现划伤、折痕、翘曲、波浪纹和死弯等现象,平面度可达到0.03 mm,即保证了质量,又提高了工作效率。     

网络计划与资源平衡的计算机管理

基于网络计划原理，利用计算机进行工程的工期与资源平衡，是现代大中型工程项目管理的有效手段。本文介绍了运用P3软件进行工期与资源平衡的方法。     

TLC30型轨道板运输车

高速铁路轨道板的运输速度影响到铺板的速度,新研制的TLC30型轨道板运输车是一种可双向行驶、转向灵活、自动调平的轨道板专用运输车,成功应用于高速铁路的施工中,得到施工单位认可。     

ZWR: Combining wear‐leveling with reclamation for flash‐memory‐based storage systems of embedded systems

Flash memory is widely adopted in embedded applications since it has several unique advantages. However, due to its hardware characteristic, uneven erasing and inefficient reclamation have been major concerns. These may not only severely degrade the overall performance but also damage the reliability. In order to solve these problems, we propose a novel scheme, which we call ZWR, for zoning, wear‐leveling, and reclamation. The storage zone is divided into the following three levels: an active zone for storing hot data, an inactive zone for storing cold data, and a transitional zone for storing the reclamation block. A function layer and a flash transformation layer are added to flash memory, which are located between the memory technology device layer and the file system. According to the combined wear‐leveling and efficient reclamation, in the function layer, the erase–write cycles are evenly distributed around the entire flash devices and the invalid blocks can be reclaimed properly. Finally, we implement an accurate flash simulator to evaluate the efficacy of ZWR and compare it with those of other flash schemes. We demonstrate that ZWR can effectively solve uneven erasing and inefficient reclamation problems. It can also greatly prolong the service life of flash devices and improve the efficiency of the erasing operation of blocks. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

长距离跨河水准测量技术及其在特大跨径桥梁建设中的应用

长距离跨河水准测量是特大跨径桥梁建设中高程控制的一项重要内容。在分析长距离跨河水准测量误差影响因素的基础上,研制了灯体式跨河水准测量照准标志并用于泰州长江公路大桥二等跨河水准测量中,实践证明了灯体式标志适合于长距离的跨河水准测量,对保证测量精度和提高工作效率具有明显的作用。     

Effect of thermal storage on the performance of greenhouse

In this communication, thermal model of a greenhouse has been developed by incorporating the effect of water wall in the north side. Various temperatures, namely plant, water wall and room temperatures as a function of climatic and design parameters have been obtained by solving coupled single-order differential equation using Runge–Kutta method. Numerical methods have been carried out for a typical day of winter for Delhi condition. It has been observed that there is significant effect in the plant, room air and water temperatures due to change in fraction of solar radiation incident on north wall (F_n) and heat capacity of water wall. Experimental validation of the proposed model for a greenhouse with brick north wall has also been carried out. It has been observed that there is a fair agreement between experimental and theoretical values. Copyright © 2002 John Wiley & Sons, Ltd.     

热风整平工艺

热风整平工艺主要包括印制板前处理，助焊剂涂覆，浸入焊料，热风整平，热风整平后处理等，作者根据多年的实践经验，介绍了热风整平工艺技术及问题的处理方法，具有一定的实际指导意义。     

新型大坝变形、渗漏自动监测仪器及监测系统的研制

中国的坝工建设从筑坝规模到数量均居世界首位。新建工程的监测系统建设和老坝的监测系统更新改造都需要技术先进、质量可靠的自动化监测仪器和系统。本文介绍了电容感应式静力水准仪、量水堰渗漏量仪、双向、三向测缝计、高精度位移计及智能模块化的分布式数据采集系统等新型监测仪器和系统的研制及工程运用实例。     

GPS精密高差测量技术的初步研究

指出GPS大地高与正常高之间的转换关系较难确定是限制GPS高程应用的主要原因。为此，在长期研究和实践的基础上，提出了在一定条件下，利用GPS精密高差测量技术完全可以象水准测量一样高精度获取正常高高差，进而获得正常高的观点。并讨论了利用GPS技术进行精密高差测量的技术方案及具体方法，给出了相应的工程实例。     

高等级公路沥青路面平整度施工控制的探讨

结合高等级公路的施工实践，分析了影响沥青路面平整度的主要因素，提出保证沥青路面平整度的控制措施和对策。