EDXRF方法在土壤重金属污染评价中的应用

高灵敏度CUT-3000型能量色散X射线荧光(EDXRF)分析仪采用低能X光管和同位素源双激发方式，以电致冷半导体探测器作为探测系统，使该分析仪具有分辨率高、检出限低、分析元素多的特点。采用该仪器成功地分析了攀枝花地区土壤中重金属的含量，评价了该区土壤重金属污染的特征，结果表明该区重金属污染主要与工矿活动有关。     

ATHLET 程序及其在低温供热堆中的应用

ATHLET 程序是德国核设施安全评审中心GRS开发的一个重要的反应堆热工水力学分析程序.它可分析除堆芯熔化事故之外的其他设计基准事故,可应用于美欧传统和先进的压水堆和沸水堆,原苏联设计的压水堆(VVER)和石墨水冷堆(RBMK),以及加拿大的CANDU堆等反应堆系统的热工分析.介绍了微机版ATHLET程序,并用它对5 MW低温供热堆自然循环稳态运行工况进行了计算,结果和试验数据符合很好.     

对GB／T47O3-2001电容式电压互感器标准的几点意见

提出对GB／T4703标准中热极限输出、准确度、电磁单元温升、承受短路能力和铁磁谐振条文的修改意见。     

纳焦飞秒激光在有机材料表面刻划微结构光栅的研究

使用振荡器产生的飞秒激光在透明有机材料PMMA表面进行了刻划微结构光栅的研究．通过理论分析得到了飞秒激光参数和平台移动速度对线宽的影响，进行了系统的加工实验，加工结果与理论分析基本吻合．在透明有机材料PMMA表面进行了多种光栅的刻划，并对刻划的光栅进行了衍射和色散测试，调整光栅的尺寸和排列方式，得到了形状各异的衍射图案。     

The measuring method of early lateral energy fraction in the scale model experiments

This paper introduces a measuring method of early lateral energy fraction in the scale model experiments. According to the interference principle of half wave length making the high frequency figure-8 directional microphone. With the signal-processing technique, a receiving and analyzing system, for the measurements of lateral energy fraction in the scale model is realized.     

配网安全评价体系研究

通过对比分析当前的评价模型的优缺点,选择层次分析法(AHP)与多级模糊综合评价法相结合对当代配网进行分析,并通过计算对其安全等级给以评估。评估结果证明,利用层次分析法对配网进行安全性评估具有客观性和实用性。     

有梭织机挂纬装置的设计原理与应用

对有梭织机引纬机构进行改造设计,研制了一套挂纬装置．文中阐述其设计原理,给出设计的一般公式,并在实际织造中对原设计进行验证     

大掺量磷石膏用于路基填料的性能试验研究

为探索磷石膏大掺量、规模化、资源化利用路径,分别以自制固化剂和水泥为胶凝材制备大掺量磷石膏路基填料,开展大掺量磷石膏混合料的击实试验、无侧限抗压强度试验及疏水改性试验,分析大掺量磷石膏与自制固化剂和水泥的适配性、击实特性、强度特性、耐水性能。结果表明,采用水泥或自制固化剂改性磷石膏击实曲线呈单峰变化趋势,且含水率偏低时对大掺量磷石膏混合料的干密度影响较小;相同配比时,固化剂体系大掺量磷石膏混合料7d无侧限抗压强度是水泥体系的1.5倍以上,磷尾砂与自制固化剂的适配性优于黏土,且配比为90%磷石膏+10%固化剂的大掺量磷石膏混合料7d无侧限抗压强度度达3.4MPa,经疏水改性后强度提升至4.2MPa,疏水剂与自制固化剂的复配较好地改善了磷石膏自身亲水特性,提升了其水稳性能。     

摩托车离合器主轴断裂失效分析及其机理

本文分析了摩托车离合器主轴用材、金相组织、显微硬度以及断口扫描电镜(SEM)宏观、微观形貌,结果表明,该摩托车离合器主轴断裂主要原因是轴颈突变截面尖角顶端曲率半径ρ值太小,形成很大的应力集中从而形成裂纹源,然后裂纹逐步扩展造成的。     

Collaborative Design of Hollow Nanocubes,In Situ Cross‐Linked Binder,and Amorphous Void@SiOx@C as a Three‐Pronged Strategy for Ultrastable Lithium Storage

Although silicon‐based materials are ideal candidate anodes for high energy density lithium‐ion batteries, the large volumetric expansion seriously damages the integrity of the electrodes and impedes commercial processes. Reasonable electrode design based on adjustable structures of silicon and strong binders prepared by a facile method is still a great challenge. Herein, a three‐pronged collaborative strategy via hollow nanocubes, amorphous Void@SiO_x@C, and in situ cross‐linked polyacrylic acid and d ‐sorbitol 3D network binder (c‐PAA‐DS) is adopted to maintain structural/electrode integrality and stability. The all‐integrated c‐PAA‐DS/Void@SiO_x@C electrode delivers excellent mechanical property, which is attributed to ductility of the c‐PAA‐DS binder and high adhesion energy between Void@SiO_x@C and c‐PAA‐DS calculated by density functional theory. Benefiting from the synergistic effect of accommodation of the hollow structure, protection of outer carbon shell, amorphous Void@SiO_x@C, and strong adhesive c‐PAA‐DS binder, c‐PAA‐DS/Void@SiO_x@C shows excellent electrochemical performance. Long cycling stability with a reversible capacity of 696 mAh g^?1 is obtained, as well as tiny capacity decay after 500 cycles at 0.5 A g^?1 and high‐rate performance. The prelithiated Void@SiO_x@C||LiNi_0.5Co_0.2Mn_0.3O₂ (NCM523) full cell is also assembled and shows a reversible capacity of 157 mAh g^?1 at 0.5 C, delivering an excellent capacity retention of 94% after 160 cycles.