浅析油浸式变压器铁芯夹件绝缘降低

通过对油浸式变压器铁芯夹件结构的了解,并结合实际案例分析铁芯夹件绝缘降低的危害和原因,从而得出铁芯夹件绝缘降低的判断处理方法.     

Improved yield and Zn accumulation for rice grain by Zn fertilization and optimized water management

研究目的：在生产高度集约化体系下,研究节水灌溉措施及锌肥对水稻产量及锌积累量的影响。创新要点：目前关于干湿交替能否对水稻增产仍存在争议,对锌含量及生物有效性也鲜有报道。因此,针对这些问题,本文系统地研究影响水稻产量及品质的两大限制性因素,即锌肥和灌溉方式对稻米锌生物有效性的影响。研究方法：采用盆钵试验模拟大田锌肥及水分管理方式,两种基因型、两种锌肥种类、两种水分管理,三个重复控制误差。利用电感耦合等离子体质谱（ICP-MS）测定微量元素锌含量,以精米中植酸含量表征锌生物有效性。重要结论：干湿交替在增加了稻米产量、锌含量及积累量方面效果显著。干湿交替结合土施硫酸锌肥可以作为水稻生产体系中获得高产、高锌、高生物有效性的农艺措施。     

微量合金元素对低锡钎料润湿性影响的研究

在低锡钎料中添加微量银、铋、锑,对其湿润性进行试验,结果表明,可以有效地改善其润湿性。     

顶喷流态化过程模拟(英文)

对顶喷流化床中的颗粒干燥过程进行模拟.引进润湿率参数表示喷雾液滴对流化颗粒的有限润湿,并利用聚丙烯和水物系的实验数据回归得到了该物系的润湿率表达式.通过得到的润湿率对顶喷流态化过程进行模拟,模拟结果与实验结果基本一致,润湿率及过程模型得到了验证.     

Concrete deterioration under the coupling effects of flexural load, cyclic wetting and drying, and sulfate

Our research focused on the analysis of concrete deterioration mechanism under the coupling effects of flexural load, cyclic wetting and drying, and sulfate. The relative dynamic modulus of elasticity of a corroded concrete sample was tested, and scanning electron microscope was used to observe the microstructure of concrete under the coupling effects of flexural load, cyclic wetting and drying, and sulfate. Results manifested that flexural load and cyclic wetting and drying during the concrete service changed the corrosion process of the sulfate medium in concrete and enhanced the deterioration of concrete performance. Furthermore, the influencing patterns of strength grade of concrete, mass concentration of sulfate solution, and mineral admixtures on the degree of concrete deterioration were identified.     

Is graphite lithiophobic or lithiophilic?

Graphite and lithium metal are two classic anode materials and their composite has shown promising performance for rechargeable batteries. However, it is generally accepted that Li metal wets graphite poorly, causing its spreading and infiltration difficult. Here we show that graphite can either appear superlithiophilic or lithiophobic, depending on the local redox potential. By comparing the wetting performance of highly ordered pyrolytic graphite, porous carbon paper (PCP), lithiated PCP and graphite powder, we demonstrate that the surface contaminants that pin the contact-line motion and cause contact-angle hysteresis have their own electrochemical-stability windows. The surface contaminants can be either removed or reinforced in a time-dependent manner, depending on whether the reducing agents (C₆→LiC₆) or the oxidizing agents (air, moisture) dominate in the ambient environment, leading to bifurcating dynamics of either superfast or superslow wetting. Our findings enable new fabrication technology for Li–graphite composite with a controllable Li-metal/graphite ratio and present great promise for the mass production of Li-based anodes for use in high-energy-density batteries.     

液饼高度法研究固体表面的润湿性质

介绍了液饼高度法测定铺展系数的基本原理，测定了一些液体在石蜡和明胶薄膜上的铺展系数，结果表明，由铺展系数计算出的接触角与实测值相等，表面活性剂可改进润湿性质。     

利用表面张力值选择护肤化妆品的油相

从表面物理化学的角度提出化妆品的油相与皮肤相接触时的状态与液固接触的状态相当,建议利用油相的表观表面张力作为选择化妆品相的半定量依据。