节能高效矿用隔爆型磁力起动器与照明信号综保组合开关设计

该装置是矿山井下电机起动用和对照明、信号提供可靠供电与控制、保护用的矿用隔爆型磁力起动器与照明综保组合开关,本组合开关具有短路,过载、断相、漏电闭锁、过压、欠压等各种保护功能.     

节能高效矿用隔爆型磁力起动器与照明信号综保组合开关设计

该装置是矿山井下电机起动用和对照明、信号提供可靠供电与控制、保护用的矿用隔爆型磁力起动器与照明综保组合开关，本组合开关具有短路，过载、断相、漏电闭锁、过压、欠压等各种保护功能。     

寒旱地区混凝土裂缝修补材料试验研究

作者对寒旱地区特殊环境下混凝土裂缝的修补材料进行了试验研究,对不同修补材料及表面防护材料的各项性能进行了测试,所选材料能较好满足寒旱地区混凝土裂缝修补的技术指标要求,试验结果具有现实意义。     

雅克拉、大涝坝凝析气田井口取样含水波动异常原因探讨

通过雅克拉、大涝坝凝析气田凝析气井井口取样化验含水试验,认为凝析油的极易分离分层的性质是造成取样含水波动异常的根本原因。由此造成手动随机性井口取样,凝析气井液相到达井口时,液相含水应该不同,即含水存在着客观上的波动性。立管内、集输水平管线油水以分层流动状态存在和取样时需控制阀门开度的现场实际情况,很难准确取到管线内能代表真实含水的样品。建议井口取样应优先立管,虽也有缺点,但相对其他位置取样,取样含水更准确性、实用性更好。     

Design of Vibrating String Pressure Sensor

The vibrating string pressure sensor is designed according to the working surroundings and conditions.This sensor is used for the weighing of the fixed-quantity bucket loader in the main shaft lifting systems of coal mines.The design of the sensor has been introduced in detail.Calibrations and errors of the sensor theoretical formula have also been analyzed.     

预应力混凝土连续-刚构桥梁的施工控制

本文通过对援建四川理县的潇湘大桥施工监控流程的描述以及考虑收缩徐变的影响,比对实际与理论值,介绍了一种保证桥梁质量行之有效的方法,希望能够对以后的施工监控工作起到一定的启发作用。     

微生物固定化载体材料研究进展

载体材料在微生物固定化技术中发挥着关键作用。阐述了固定化技术对载体材料性能的要求。对天然载体、合成高分子载体、人工无机载体、复合载体等不同载体材料的研究与应用进行了综述。各类材料各有其优点及其适用性,认为新型改性复合载体材料的研究是今后主要的发展方向。     

Study on fluorescence properties of rare earth complexes influenced by steric effect

The rare earth complexes Tb(o-BrBA)3,Tb(m-BrBA)3 and Tb(p-BrBA)3 were synthesized using o-,m-,p-bromo benzoic acids(2-bromo benzoic acid,3-bromo benzoic acid and 4-bromo benzoic acid) as ligand,respectively.The UV spectra showed that the absorption ability of Tb(m-BrBA)3 was the strongest.However,the fluorescent intensity of Tb(o-BrBA)3 was the weakest.The effect of the molecular structure,the energy level of Tb3+ and energy transfer efficiency from ligands to Tb3+ were discussed to explain the experimental results.The results indicated that,due to the large atomic radius of bromine,the steric effect caused by the different substitution bromine on the benzene ring might strongly affect the bond length formed by the coordination atoms and Tb3+.The longer the bond length was,the lower the efficiency of energy transfer was,and the weaker the fluorescent intensity was.     

液体容积式流量计的漏流量变化原因分析

本文主要是对液体容积式流量计漏流量发生变化原因的探讨。