电加热柔性连续抽油杆动态特性的计算机模拟

根据电加热柔性连续抽油杆的特性、参数及井下基本工况,建立了三级混合抽油杆柱的有限元模型。运用有限元软件对混合杆柱的动态特性进行计算机模拟,得到各关键点位移、速度随时间变化曲线,以及计算机模拟的地面示功图,为抽油机、抽油杆设计和井下故障诊断提供理论依据。与传统电加热空心抽油杆相比,电加热柔性连续抽油杆在降载和节能方面优势显著。     

新型微波-毫米波幅相测试系统及扩展应用

介绍了一种新型微波 毫米波幅相测试系统及其在相关测试领域中的典型应用。与传统微波幅相测试系统相比 ,该系统具有原理新颖、结构简单、扩展频段容易和使用方便等优点。本系统目前广泛应用于紧缩场电气性能检测、天线测量和RCS测量等领域中 ,频率范围为 1～ 110GHz。本测试系统已经申请国家专利 ,并通过相关部门鉴定。     

导电聚苯胺在微波场中的升温特性

本文研究了微波辐照下导电聚苯胺的升温特性。研究表明 ,导电聚苯胺在微波场中具有快速升温的特点 ,升温速度与掺杂剂的种类、掺杂酸的浓度、聚苯胺的导电率、合成聚苯胺的温度等因素有关。盐酸掺杂聚苯胺热稳定性较差 ,在微波场中不能反复升温 ,而热稳定性较好的DBSA掺杂的聚苯胺具有一定的反复升温能力     

微波复合介质基板性能研究

采用微扰法、螺旋圆柱谐振法和带状线谐振法分别对聚四氟树脂复合精细电子陶瓷微波复合介质的复介电常数进行了测量与误差分析。基于扫描电子显微镜 (SEM )观察 ,从微观上解释了辊压工艺对介质介电性能一致性改善的原因。研究了不同的表面处理方法对基板金属化剥离强度的影响规律。     

天然气供热供冷的技术经济分析

对冬季采用天然气热水锅炉供热，夏季采用电动离心式冷水机组供冷和冬夏季都采用天然气直燃型溴化锂吸收式冷热水机组进行供热供冷的两种方案进行了技术经济比较。指出天然气价和电价是影响供热供冷成本的最敏感因素。     

Microwave plasma synthesis of TiN and ZrN nanopowders

This work demonstrates that TiN and ZrN nanopowders can be prepared by microwave plasma synthesis method. The effects of flow rate of plasma forming gas, flow rate of carrier gas and feeding rate of precursor raw material to the average particle size were studied. The TiN and ZrN nanopowders were characterized by means of transmission electron microscopy (TEM) and X-ray diffraction (XRD).     

轧钢加热炉高效运行的新模式

介绍了综合应用新型无水冷技术和热管技术的轧钢加热炉高效运行的新模式，并结合首钢第一线材厂的实践，进一步阐明了该模式的实用性和给企业带来的良好效益。     

两流薄板坯连铸连轧作业时铸坯在加热炉内的运行规律

讨论了两流薄板坯连铸连轧作业时铸坯在加热炉内的运动情况。分析了进入出坯段的铸坯的模式选择，进而确定铸坯进入平移段的时机。定义了加热炉综合进坯速度和加热炉平均出坯速度两个概念来讨论铸坯出坯的两种方案，并提出最小铸坯长度和最大加热炉综合进坯速度的计算公式。     

微波电路互联与制造技术

介绍微波电路CAD与优化、微波集成电路及其制造、微波互联材料与工艺、微波MEMS等微波电路互联与制造新工艺、新技术的国内外研究和发展动态。     

Observer-based monitoring of thermal runaway in microwaves food defrosting

Despite its energetic interest, the use of microwaves for the thawing or temperage of food products presents a major drawback called thermal runaway. This is mainly due to the important gap between the dielectric properties of water in solid and liquid phases. A monitoring approach of the temperatures inside a foodstuff during microwave defrosting is therefore proposed to, in a first step, detect the critical phenomena of thermal runaway, and, in further work, to control it. An observer allowing to estimate the internal temperatures from the temperature of the surface has been developed. An Extended Kalman Filter, because of its simplicity of design, has been chosen, but this choice is not exclusive. The heat transfer with phase change and microwave effects is represented by a nonlinear distributed parameters system, and the observer is based on a standard finite volume scheme. The approach is experimentally carried out and validated during the defrosting of a block of tylose.