输电线路的故障分析及防治措施

为降低输电线路跳闸率,在统计近十年来赣东北电网运行故障的基础上,总结了雷击、外力破坏、鸟害、覆冰等引起线路跳闸的原因,介绍了赣东北公司所采取的防护措施:更换铜矿尾砂、安装负角保护针、防绕击避雷针、(清明、冬至)防山火蹲守、安装带相序防鸟箱、更换ACCC导线等.解决线路的故障问题,要从实际出发,因地制宜、综合治理.     

导电体应用铝材 符合国情

现代冶金技术、双金属熔合技术、铝加工技术迅猛发展,而铜价猛涨,我国铜资源贫乏,从技术、价格、安全、资源利用等方面进行分析,提出导电体应以铝代铜。     

基于数值传热学原理的DCS机柜电源电缆导体温升计算

为确保DCS机柜220 V AC电源电缆长期可靠运行,需确认电缆的导体温升是否满足电缆规格书中的要求。根据现场实际情况分析,并基于数值传热学原理建立了保守模型对电缆托盘上电缆导体温升进行包络计算。计算结果表明,目前的电缆托盘上的电缆敷设情况不会导致电源电缆导体的温升超过电缆技术规格书的要求。     

离线镀膜玻璃针孔缺陷的影响因素探讨

采用离线磁控溅射工艺生产的镀膜玻璃,由于其颜色丰富、性能优良、生产效率高等特点,在建筑玻璃领域得到了广泛的应用。生产过程中由于多种因素的影响,镀膜玻璃会产生各类缺陷,通过对磁控溅射生产镀膜玻璃在过程中出现的针孔缺陷进行分析,结合实际生产经验给出相应的改善方法。     

我国家电彩涂板发展趋势

分析了我国家电行业现状、家电用彩涂板市场需求新特点和彩涂板生产控制面临的困难。提出了彩涂板生产行业的应对策略。     

钛基IrO2+SnO2电极的析氧性能及其在电合成丁二酸中的应用

通过热分解法制备了IrO2+ SnO2/Sb2 O3+ SnO2/Ti、IrO2+ SnO2/Ti、IrO2+ Ta2O5/Sb2O3+ SnO2/Ti电极,通过线性伏安、电化学阻抗、强化寿命测试等研究了钛基涂层电极在1 mol· L-1硫酸溶液中的析氧性能.采用EDX、SEM等考察了电极的表面元素分布和电极强化寿命测...     

两种不同包膜材料控释肥料在玉米上的增产效果

采用田间试验研究了硫黄加树脂包膜尿素(SPCU)、树脂包膜尿素(PCU)在玉米上的施用效果。结果表明:氮素同等用量时控释尿素增产效果显著,分别比相对应的等氮量普通尿素(PU100%)增产7.3%、5.9%,N用量减少30%的SPCU70%、PCU70%处理产量分别比相对应的等氮量普通尿素(PU70%处理)增产10.2%、9.1%;控释尿素氮素用量比普通尿素氮素用量减少30%,不影响夏玉米产量。     

Proton conductors of cerium pyrophosphate for intermediate temperature fuel cell

The crystal structure and proton conductivity of cerium pyrophosphate are investigated to explore its potential electrolyte applications for intermediate temperature fuel cell. Among the CeP₂O₇ thin plates, which are sintered at 300–900 °C, the 450 °C CeP₂O₇ sample exhibits superior proton conductivity under humidified conditions. Its conductivity, measured with impedance spectroscopy, is higher than 10⁻² S cm⁻¹ in the intermediate temperature range, with a maximum value 3.0 × 10⁻² S cm⁻¹ at 180 °C. When 10 mol% Mg is doped on the Ce site of CeP₂O₇, the maximum conductivity is raised to 4.0 × 10⁻² S cm⁻¹ at 200 °C. The Mg doping not only raises the conductivity, but also shifts and widens its temperature window for electrolyte applications. Ce_0.9Mg_0.1P₂O₇ is considered a more appropriate composition, with conductivity >10⁻² S cm⁻¹ between 160 and 280 °C. Accordingly, a hydrogen–air cell is built with the Ce_0.9Mg_0.1P₂O₇ electrolyte and its performance is measured. The fuel cell generates electricity up to 122 mA cm⁻² at 0.33 V using 50% H₂ at 240 °C.     

Electrochemical characteristics of porous TiO2 encapsulated silicon anode

TiO₂ coated silicon, which was prepared by the modified sol–gel method, was employed as the anode material for lithium secondary batteries and the relationship between the diffusivity and electrochemical characteristics was investigated. The results showed that the physical properties of the samples, such as their diffusivity and pore size distribution, enhanced the cycling efficiency of the TiO₂ coated silicon, probably due to the reduction of the side reactions, which may be closely related to the pore size distribution of the TiO₂ coating layer. The pore size of the coating layer plays an important role in retarding the lithium ion diffusion. In the experimental range studied herein, higher capacity retention was exhibited for the TiO₂ coated silicon prepared at pH 10.7.     

内涂层油管在酸性环境的耐腐蚀性能研究

文中建立了一套酸性气田用内涂层油管耐腐蚀性能评价方法,此方法先考察了内涂层油管在氯离子、氢离子、凝析油、H₂S/CO₂等介质环境的耐渗透性能,再考察了内涂层油管在高温高压高酸性条件下的耐腐蚀性能,配套制定的相关指标,可用于指导内涂层油管应用。结果表明:酚醛环氧内涂层油管具有较好的耐渗透性能,酸性条件下并不改变涂层耐渗透性能;而随着温度的升高及硫化氢分压的升高,涂层失效由阴极剥离失效转变为鼓泡失效。