基于PMAC的软件PLC中触发条件的应用

简要介绍PMAC运动控制器及基于PMAC的软件PLC的特点,详细介绍软件PLC中边沿触发功能的实现及应用实例.     

冲击钻机的冲锤可靠度计算

本在分析冲击钻机的工作原理与冲锤受力因素的基础上，对冲锤工作可靠度进行了计算分析，提出了提高冲击钻机冲锤工作可靠度的方法。     

地理信息系统与油田规划设计

本文阐明了GIS(地理信息系统)与CAD、事务管理型数据库不同的原因,即在于GIS有一种空间数据。它具有对石油规划设计十分有价值的空间分析能力。并对GIS在油田规划中可能的系统构成,及建立该系统可能出现的问题进行了探讨。     

Limit Analysis for the Mechanical Structure of the ITER Neutron Shielding Block

The ITER neutron shielding blocks are located between the inner shell and the outer shell of the vacuum vessel (VV) with the main function of providing neutron shielding. Considering the combined loads of the shielding blocks during the plasma operation of the ITER, limit analysis for one typical ferromagnetic (FM) shielding block has been performed and the structural design has been evaluated based on the American Society of Mechanical Engineers (ASME) criterion and European standards. Results show that the collapse load of this shielding block is three times the specified load, which is much higher than the design requirement of 1.25. The structure of this neutron shielding block has a sufficient safety margin.     

公路工程质量评定管理系统研究与应用

分析了公路工程质量评定的特点和现状,提出了有效的公路工程评定质量管理系统体系结构并进行系统详细设计,将该系统用于具体工程中,指出该系统能有效实现工程质量评定、质量动态控制和相关质量问题决策等功能。     

硬齿面大规格等高弧齿锥齿轮的磨削加工

通过对格里森No137(No463)磨齿机设计原理、空间曲面分析、齿面修正的原因分析,改变大、小轮加工调整参数,把理论齿面修正成一个互相啮合的实际齿面,使接触区不是布满整个齿面而是形成一个以齿面某一点的局部接触,来实现在格里森No137(No463)磨齿机上加工超规格等高弧齿锥齿轮,满足了国内市场的需求,实现了等高弧齿锥齿轮磨削的工艺.     

Thermal and Hydraulic Analysis of the ITER Upper Vertical Stabilization Coil

The ITER upper vertical stabilization（VS） coil is a part of the ITER in-vessel coil（IVC） system, which has the abilities of restraining edge localized modes（ELMs） and maintaining plasma vertical stability. Preliminary structural analysis of the coil has revealed serious thermal stress problems. Due to the very restricted geometry space, it is necessary to perform detailed analysis on thermal and hydraulic characteristics to help optimal design of the coil. It will focus on the temperature distribution and energy balance, as well as some key factors, such as the coolant flow state and surface emissivity, which have influences on the coil performance. The APDL code and some hand calculations are employed in the analysis. The results show that the coolant convection can effectively take away the heat deposited in the coil. But improving the coolant flow state can hardly mitigate the peak temperature occurring at the edges of coil attachments, which are located far away from the coolant. Thermal radiation was expected to be a good method of cooling down these parts. But the reality is not so optimistic since it usually contributes little in the whole energy balance. However, the effect of thermal radiation will become remarkable when bad scenarios or accidents take place. Poor radiation performance of the coil will result in a potential safety hazard.     

Design of Tokamak ELM Coil Support in High Nuclear Heat Environment

In Tokomak, the support of the ELM coil, which is close to the plasma and subject to high radiation level, high temperature and high magnetic field, is used to transport and bear the thermal load due to thermal expansion and the alternating electromagnetic force generated by high magnetic field and AC current in the coil. According to the feature of ITER ELM coil, the mechanical performance of rigid and flexible supports under different high nuclear heat levels is studied. Results show that flexible supports have more excellent performance in high nuclear heat condition than rigid supports. Concerning thermal and electromagnetic （EM） loads, optimized results further prove that flexible supports have better mechanical performance than rigid ones. Through these studies, reasonable support design can be provided for the ELM coils or similar coils in Tokamak based on the nuclear heat level.     

Cr-V-Al微合金化SWRH82B钢生产工艺研究

SWRH82B是日系牌号的高强度预应力钢绞线用钢,而目前天津荣程联合钢铁集团有限公司实施的JIS G3506日系标准,已无法满足SWRH82BΦ13mm盘条抗拉强度≥1180MPa的市场要求,因此需要在此标准的基础上实施微合金化,以提高盘条抗拉强度.本文对SWRH82B硬线钢的微合金强化工艺进行了研究,并介绍了SWRH...     

改性生物炭对土壤重金属污染修复研究进展

土壤中金属污染导致食用林产品、农产品中重金属高富集,严重威胁人类健康。生物炭作为简单易得,来源广泛的吸附材料,可用于土壤重金属污染物修复。本文主要综述了生物炭的制备、改性剂的选择与功能、改性方法及改性生物炭的特性。介绍了改性生物炭的表征手段如傅里叶变换红外光谱、扫描电子显微镜、X射线光电子能谱和比表面积和孔径分析仪在生物炭改性过程中的作用及分析方法。客观分析了改性生物炭的制备方式及对土壤重金属污染修复的机制及效果,并讨论生物炭及改性生物炭对重金属常见的吸附机理以及表面吸附、静电作用、离子交换和共沉淀的特征和条件。大量的研究结果表明,生物炭对降低土壤中重金属的有效态含量具有显著效果,且经过酸碱、氧化还原、吸附剂复合等方式改性后吸附性能更加高效和稳定。生物炭改性是为了提高生物炭的安全性、高效性、重复使用性和环境友好性,同时加强生物炭的重金属修复性能。因此,功能型生物炭的研制及拓展改性生物炭的应用是生物炭改性的进一步深入研究方向。