遮掩式低回波金属支架的设计

本文推出了一种具有固定遮掩屏的低ＲＣＳ金属支架系统；介绍了其主要特点及设计方法；计算了该支架了多种数学模型的散射截面分布；试验研究了优化支架模型的散射特性。本文的计算及试验结果对于设计制做产用回波金属目标支架具有重要的参照价值。     

3mm波段极近距离雷达

提出一种极近距离雷达概念，并导出其作用距离公式，在此基础上研制出一台３ｍｍ波段极近距离多普勒雷达样机．试验结果表明该雷达结构简单，成本低廉，在作用距离为零点几米至几米范围内可获得较高的定距精度．     

改进电炉变压器有载调压开关的探讨

分析了目前使用的电炉变压器调压开关的原理及存在的问题，结合生产实际提出了改进方案。     

Microstructure study of Sm,Mn-modified PbTiO3 piezoelectric ceramics by XRD profile-fitting technique

By using the X-ray diffraction profile-fitting technique, the microstructures of Sm, Mn-modified PbTiO₃ piezoelectric ceramic discs, including ferroelectric domain sizes, microstrains, and their variations with the poling strength have been quantitatively investigated. The results manifest that the modified PbTiO₃ ceramics contain a high density of domain walls due to the presence of finely-divided coherent domain structures (tens of nanometres in dimension). The poling treament can evidently influence the domain-size distribution, with a more homogeneous microstructure being developed; however, it simultaneously causes high anisotropic microstrains within the structure which, together with the high density of domain walls, is expected to be responsible for the unusual high electromechanical coupling properties possessed by this material.     

高能气体压裂联作技术进展

国内高能气体压裂增产技术已经由单一的有壳弹、无壳弹、液体药、可控脉冲等高能气体压裂,进展到与射孔、水力压裂、酸化、化学解堵等技术相联作的综合压裂阶段。分别对高能气体压裂与射孔、水力压裂和化学解堵等联作技术的基本原理、现场试验、作业效果等进行了介绍。高能气体压裂已发展成一种基本成熟的、综合性油气田增产改造新技术。     

用AIR-C2H2原子吸收光谱法测定镉镍电池正极浸渍液中钴含量

本文主要简述与运用AIR-C2H2原子吸收光谱法进行镉镍电池正极浸渍液中钴含量的测定，介绍了钴最佳测定条件及呈良好线性范围的浓度。同时对样品消化处理条件，在测定中样品的干扰因素进行了综合考虑，该方法具有很好的灵敏度，很好的重复性，干扰小，同时具有方法步骤简单，操作容易掌握等特点，对样品钴含量的测定，其相对标准偏差均小于1.0%（n=6），标准加入回收率均在97.0%～102.0%(n=5）范围内，结果表明，运用AIR-C2H2原子吸收光谱法测定镉镍电池正极浸渍液中钴含量的分析，达到了实验室分析质量控制的要求，完全适用于镉镍电池正极浸渍液中钴含量的控制分析和样品系统分析。     

强耦合表面磁极化子的基态能量和有效质量

采用Landau-Pekar变分理论研究强耦合表面磁极化子的性质。分别计算了强耦合表面磁极化子的基态能量和有效质量，并讨化了表面磁极化子的基态能量，振动频率和有效质量随磁场的变化关系。对KCL晶体进行了数值计算，结果表明，强耦合表面磁极化子的振动频率和有效质量随磁场的增加而增加，基态能量随磁场的增加而减少。     

Development of Bi(Pb)-2223/Ag pancake-shaped and solenoidal coils

High temperature superconducting (HTSC) multifilamentary (MT) Bi(Pb)-2223/Ag tapes with reproducible critical current density of between 15000 and 20000 A/cm² at 77 K in self field have been achieved using the standard flat-rolling method as the intermediate deformation between sintering periods. Long lengths of Bi(Pb)-2223/Ag MT tapes up to 43 m prepared by the conventional method of powder-in-tube (PIT) have been successfully produced on a laboratory scale. Several coils have been fabricated from sections of the long length tape, using the co-wound wind-and-react (W&R) procedure for the pancake-shaped and the singly-wound W&R as well as R&W procedure for the solenoidal coils. A novel W&R solenoidal coil (reaching ~973 ampere-turns) wound on an alumina ceramic tube generates a DC field of ~19 mT at 77 K and has been fabricated together with five pancake-shaped coils, each generating an average of ~5 mT at 77 K. These are destined for magnet construction with a possible combined calculated field of ~0.04 T at 77 K (with liquid nitrogen as a coolant)     

A force modulation study on crystallization process in ferroelectric vinylidene fluoride and trifluoroethylene copolymer films

This paper introduces the Force Modulation technique to the study of crystallization process in ferroelectric vinylidene fluoride and trifluoroethylene copolymer films. Using this technique we have successfully visualized ferroelectric crystalline domains and observed that these ferroelectric domains grow out from amorphous phase, unite into strip-like structures, and finally congregate into a union. Force Modulation can weaken the influence of topography on imaging of ferroelectric domains, and reveal more details, which are difficult to be observed in topographical image.     

输气管道投产置换过程气体混合规律研究

目前国内输气管道置换工艺主要依据人工经验进行，存在较大的盲目性，导致天然气管道投产成本较高，安全风险较大，有必要对输气管线安全投产工艺进行科学、系统的研究，实现输气管道的安全、高效、经济投产模式。文章讨论了现有置换工艺中不同的置换方式，认为不加隔离器的置换方法具有置换效率高、费用低以及安全可靠等优点，是一种有前途的新工艺、新方法。同时，为确保置换过程的安全性，针对置换过程中注氮量确定的盲目性问题，采用模拟试验方法，研究了天然气与氮气、氮气与空气混合段在不同流速和背压下长度的变化规律，从而为确定合理的用氮量提供了理论依据。