氟溴甲烷的制备及应用

氟溴甲烷是重要医药中间体、农药中间体和氟甲基化试剂,本文综述了其制备方法与性质,简单介绍了其应用.     

汽车电泳磷化废水两级混凝处理

汽车工业电泳磷化废水成分复杂，ＣＯＤ高达数千，可生化性差。采用两级混凝反应——气浮——过滤——吸附工艺可获满意的处理效果。其中聚合氯化铝（ＰＡＣ）对乳化油珠的电中和破乳及其凝絮对高分子有机物的吸附起主要作用。选择阳离子高分子絮凝剂，由于其水解产物带有正电荷铵盐基团，加强了残存ＣＯＤ的吸附，完善了絮凝分离过程。     

对被审计单位自纠行为的反思与对策

每年年末或年初,总会出现这种现象：一些单位对新一年度的审计计划非常关注,这并非是被审计单位对审计工作的重视和关心,自觉接受审计监督的意识强在审计机关制定年度审计计划时,积极打听,获取信息,一旦本单位已纳入年度审计对象,则积极准备,修改补充账目。审计人员审计时觉得有些账目有突击修改补记的痕迹,但却苦于没有足够的证据和进一步深查的线索,也只能不了了之。其实被审计的单位真正目的是在逃避审计处罚,审计过后,他们仍会明知故犯,故伎重演。     

黄瓜中毒死蜱残留基体标准物质的研制

目的 建立黄瓜中毒死蜱残留基体标准物质的研制方法。方法 选择符合标准物质研制要求的新鲜黄瓜为研制对象,经过预冻干、添加、混匀、二次冻干、过筛、包装及辐照灭菌,采用气相色谱-串联质谱法测定,同位素内标法定量,经均匀性和稳定性检验后,采用多家实验室合作定值的方式进行定值。结果 通过11家独立实验室合作定值及不确定度评估,毒死蜱的特性值为0.403±0.033 mg/kg(k=2)。结论 研究表明获得的样品均匀性和稳定性良好,适用于黄瓜中毒死蜱检测过程的方法研制和质量控制。     

高压辊磨机在凹山选厂的应用效果初步评价

对马钢凹山选矿厂上马的国内金属矿山第一条高压辊磨机超细碎及其选别系统进行了考察,从考察结果看,高压辊磨机用于超细碎可提高物料中-3 mm粒级的含量37.58个百分点,高出合同要求7.58个百分点,并显著改善了物料的可磨性;粗粒（-3 mm）湿式磁选作业可抛出产率48.87%、品位7.73%的合格尾矿,闭路筛分筛上物料干抛作业可抛出作业产率11.18%、品位7.07%的合格尾矿,表明粗粒抛尾作业不仅合理、而且高效。     

Effect of cooling and aging on microstructure and mechanical properties of Sn－9Zn solder

The microstructure and tensile properties of Sn-9Zn solder under different cooling and aging condition were studied.During solidification, the distribution of Zn-rich phases and grain size in the microstructure of Sn-9Zn solder were decided by the cooling rate.The Zn-rich phase in Sn-9Zn solder under furnace cooling, air cooling and water cooling media was separately existed as coarsen dendritic and needle like shape, fine needle like shape and very fine rod-like shape, respectively.After aging, the coarsen dendritic was broken and the coarsen needle like Zn-rich phase was partly changed into fine distribution of Zn-rich phase for Sn-9Zn solder with furnace cooling, and the rod-like Zn phase in the Sn-9Zn solder under water cooling was changed to conglomerated Zn with needle shape.During tensile testing on Sn-9Zn solder, tensile strength and ductility reached the best with water cooling, but decreased with aging effect.Meanwhile, the ductility of solder with air cooling and the strength of solder with furnace cooling increased with aging.The fracture mode was ductile and was independent of cooling media and aging effect.The size and depth of dimples decreased from water, furnace to air cooling.After aging, number and size of dimples increased on the solder with furnace cooling and air cooling.The change on the size of dimples for the Sn-9Zn solder under different cooling condition and with aging effect was accordance to the tensile properties.     

谈春熙大厦三期方案设计

针对春熙大厦三期设计方案进行了解读,分别介绍了该方案的设计构思、功能分区、交通组织、立面造型等内容,指出该建筑方案将建筑空间、造型与功能有机结合,庄重而不失现代感,具有标志性。     

浅析城市混凝土路面的碎石化技术

本文在大的发展背景下,论述了碎石化技术的原理及其主要优点.提出碎石化技术的适用条件及常见设备,最后重点阐述了碎石化加铺层结构设计及其应用过程中应注意的问题.     

10kV干式空心串联电抗器故障原因分析

通过对江西省连续发生的2起干式空心串联电抗器故障原因的分析,发现铝材料的不均匀、绝缘材料的耐热等级偏低以及并联电容器组的频繁操作导致了这2起故障的发生.由此,向运行维护部门提出了故障防范措施.