Ti/NiCu/Ag and Al/NiCu/Ag thin film deposited on positive temperature coefficient (PTC) thermistor by direct current magnetron sputtering

Metallization of positive temperature coefficient (PTC) thermistors deposited by direct current magnetron sputtering has been investigated. Two kinds of multilayer thin films, namely Ti/NiCu/Ag and Al/NiCu/Ag, are proposed as electrode materials. Conventional NiCr/Ag thin film serves as reference electrode in the experiment. Experimental results show that the newly proposed electrodes exhibit good performance including low ohmic contact, firm adhesion, fine solderability and stability. The surface resistances at room temperature of Ti/NiCu/Ag and Al/NiCu/Ag PTC range from 4.3 to 6.2 Ω, and they change little in moisture condition. The average tensile strength is 6.3 Mpa, which provides firm adhesion between electrode and substrate. At solderability test, the new electrodes can withstand the soakage of lead-free solder at 350 °C for 5 s and the properties remain stable after high temperature treatment.     

Study on the slurrying and rheological properties of coal–oilfield wastewater–slurry

In this study, oilfield wastewater (OWW) was used to prepare coal–oilfield wastewater–slurry (COWS), and the apparent viscosity, solid concentration, and rheological curve were studied. Compared with original coal–water–slurry (CWS), the maximum solid concentration of COWS increased, and the viscosity decreased; therefore, the slurrying ability of the coal slurry was improved with the use of OWW. However, although the oil in OWW promoted the slurrying ability of the coal slurry, its effectiveness was insufficient, and a chemical additive was still needed to obtain a coal slurry with enhanced slurrying ability. Both COWS and CWS exhibited shear-thinning behavior, and the rheological index value of COWS was lower, which indicated that pseudoplasticity of COWS was more obvious, and OWW improved the rheological properties of coal slurry.     

配电变压器零序电流治理优化方法及装置

目前,在配电网采用的三相四线制中,针对三相不对称负荷运行导致零序电流长期偏高,造成变压器损耗并影响变压器的寿命,且现有全容性无功补偿装置易造成严重过补偿危害,本文提出了一套零序电流治理的全容性无功补偿优化算法及装置。主要通过实时计算三相负荷所需无功补偿量,利用优化算法以全电容方式对相间与相对地间电容器组进行动态投切,进而通过有功转移及无功补偿方式实施零序电流的抑制。挂网运行结果表明,该装置能有效防止严重过补偿危害,并能有效抑制零序电流的增长,提高功率因数以及降低配电变压器损耗;同时采用先进的GPRS无线通信和监控软件实时互动,为负荷的状态调整提供了参考信息,达到了节能减排的效果。     

环形支撑在不规则形状深基坑支护中的应用

结合工程实例,论述了环形支撵在不规则形状深基坑中的应用,并且采用环形支撑很好地控制了基坑变形,方便了土方开挖和基础施工.这对类似工程具有参考意义.     

脱硫型水煤浆燃烧脱硫的机理研究

脱硫型水煤浆燃烧具有较高的脱硫率，为深入研究其机理，采用Ｘ射线衍射仪等手段，结合水煤浆燃烧特点，分析了整个脱硫过程．特别对于水煤浆燃烧脱硫优越于煤粉的原因作了解释，提出脱硫型水煤浆具有较高脱硫率的机理在于：耐高温脱硫产物３ＣａＯ３Ａｌ２Ｏ３Ｃａ－ＳＯ４的形成、增湿活化作用以及较低的燃烧温度     

人工神经网络方法在优化动力配煤中的应用研究

对神经网络ＢＰ算法的一些改进作了大量的数值试验研究，并组合了部分改进方法用于动力配煤问题中状态预测过程的建模，最后把神经网络方法纳入到非线性混合离散变量优化设计方法（ＭＤＯＤ法）中，对杭州配煤场 动力配煤过程作了应用介绍。     

几种国产聚丙烯透明成核剂性能的研究

研究了采用国产三代山梨醇透明成核DMDBS制备的透明聚丙烯的光学性能、结晶性能、机械性能与热性能。研究表明,在0~2500ppm内随着添加量的增加,国产三代山梨醇透明成核剂与美利肯3988i具有相似的浊度变化曲线。在同样的添加量下,国产三代山梨醇透明成核剂具有与3988i相近的光学性能、结晶性能、机械性能与热变形温度,且无气味,可作为替代进口透明剂、降低生产成本的有效途径。     

一种基于P2P点组技术的流媒体协作计算

分析了流媒体技术的现状和问题,讨论了在P2P环境下的流媒体多点分布式调度技术和调度性能分析,以及多点调度下的带宽分配算法,最后给出了一个基于P2P点组的流媒体协作调度模型。     

Viscoelastic behaviors and drying kinetics of different aqueous gelcasting systems for large Nd: YAG laser ceramics rods

Large and nondeforming Nd: YAG ceramic prepared by wet forming is of great importance as gain medium to obtain high-power solid-state lasers. However, it is difficult to achieve high-quality laser ceramics due to insufficiency of the in-depth understanding of transformation mechanism of gels viscoelasticity and effective control means during drying process. In this work, the rheological behaviors, viscoelastic characteristics, and mechanical strengths in classical acrylamide (AM) and novel Isobam (PIBM) gelcastings were systematically compared to explore the suitable route for the large-sized 2% Nd: YAG transparent ceramics with high aspect ratio (>10). AM system exhibited a higher complex viscosity (1.82 × 10⁵ Pa s), a shorter gel time (92.9 seconds), and a higher flexural strength (about 24.46 MPa) than PIBM system, and especially its ability to quickly gel was beneficial to the homogeneity of green body. In addition, the order of drying rates of wet gels in four drying media was observed as follows: 55℃ hot air> ethanol> solid desiccant> PEG-11000 and the moisture diffusion coefficients were calculated and simulated to offer the deep consideration of drying kinetics. The “ethanol + 55℃ hot air” was regarded as an effective composite drying method to eliminate defect and to achieve φ8 mm × 160 mm Nd: YAG ceramic with the in-line transmittance of 83% @1064 nm. Therefore, not only the cognition of gel process, but also the defects control strategy is proposed. More importantly, this work greatly promotes the application of wet forming and laser ceramics in high-power lasers.