弥散铜镦挤成形过程的数值模拟

通过有限元计算机模拟系统DEFORM对弥散铜粉末体材料镦挤过程进行数值模拟 ,说明了弥散铜的变形特征和致密化过程。其结果与粉末体变形理论一致。通过数值模拟 ,可预测成形载荷和产品组织性能 ,可进行工艺参数的优化     

常温下粉碎废旧轮胎的研究

利用自行开发的研磨机对废旧轮胎进行常温粉碎实验 ,结果表明 :本装置完全适合常温下用废旧轮胎制取胶粉 ,通过改变操作参数可以得到不同粒度的胶粉。为胶粉的制造方法开辟了新的途径     

COD/SO_4~(2-)值对硫酸盐废水厌氧消化的影响

采用间歇试验方式,研究了COD/SO_4~(2-)值对硫酸盐废水厌氧消化的影响。试验结果表明,COD/SO_4~(2-)值是影响厌氧消化处理效果的主要参数。本试验中,COD/SO_4~(2-)>15,硫酸盐还原作用对厌氧反应器影响甚微;COD/SO_4~(2-)=5—15时,硫酸盐还原作用对厌氧反应器产生轻度抑制,相对产甲烷率为79.2％—94.7％;COD/SO_4~(2-)=0.5—5时,反应器受中度抑制,相对产甲烷率为61.6％—79.2％;COD/SO_4~(2-)<0.5时,反应器受严重抑制。COD/SO_4~(2-)≥1时,相对产甲烷率与COD/SO_4~(2-)值之间有很好的线性关系。     

铬酸钡分光光度法检测硫酸盐的检出限分析

检出限的大小主要取决于仪器的灵敏度、稳定操作和操作技能等因素。通过精密度偏性试验、由空白值批内标准偏差估算检出限,得出检出限综合估计值。     

Uptake of copper ion by activated sludge and its bacterial community variation analyzed by 16S rDNA

The effect and uptake of copper ion on SBR(sequence batch reactor)biological treatment system was studied.special nutrient and powder activated carbon(PAC)additive were tested as uptake stimulation technique.Results showed that copper ion had higher effect on unacclimated activated sludge system than on acelimated one.The special nutrient adding could enhance the uptake of copper significantly,while PAC adding could improve the sludge settling and decrease the turbidity of effluent.The variation of bacterial community analyzed by 16S rDNA method showed the acclimation of copper could increase copper resistance species,and excess accumulation could cause some species diminish.It was confirmed that acclimation could improve the resistance and uptake ability of microorganism to heavy metal.     

微生物法处理含硫酸盐酸性矿山废水

论述了微生物法处理含硫酸盐酸性矿山废水的基本原理和工艺过程，对硫酸盐还原菌利用的基质碳源，硫酸盐还原的反应器类型和反应器内载体介质类型进行了综述。     

粉末冶金高纯铬和铬合金溅射靶材烧结工艺研究

介绍了不同加工方式对铬靶烧结密度的影响。在机压过程中,采用双向压制,不添任何成型剂和脱氧剂。机压+真空烧结铬环靶材密度为78%～80%;冷等静压+真空烧结铬板靶材密度大于82%;而经轧制后,铬板靶材密度提高到90%～95%;铬合金靶材采用热压方式,其密度大于98%。通过优化烧结时间和烧结温度等工艺参数,铬环靶材的烧结成本大大降低。     

草浆造纸黑液ASF(活性炭、硫酸钠、糠醛)综合利用工艺研究

据统计,1988年我国造纸企业已达5360个,产量达1270×10⁴t,其中近5000个为年产5000t以下的小草浆厂,产量占总产量的43 ％左右.这些小草浆厂大多采用碱法制浆,这部分制浆蒸煮黑液,绝大多数直接排放江河,造成严重污染.开发多方面的综合利用途径,使草浆黑液变废为利,是一项有意义的研究课题,我们所开展的草浆造纸黑液ASF综合利用工艺,是一种将黑液作为制取活性炭、硫酸钠、糠醛的资源,同时也使其中绝大多数污染物得到去除的工艺.     

Major and trace elemental analysis in milk powder by inductively coupled plasma-optical emission spectrometry (ICP-OES) and instrumental neutron activation analysis (INAA)

Major and trace element in seven different kinds of milk powder were studied. The concentration of 24 elements were determined by ICP-OES method, from these elements 9 elements determined by INAA. The determination of trace element contents of foodstuffs, especially milk as daily drink for all peoples age which being a complex food has great importance. The elemental analysis of milk is important both as an indicator of environmental contamination and because milk is a significant pathway for toxic metal intake and a source of essential nutrients for humans. The major elements are Ca, K, Mg, Na, P and S. While trace element are B, Ba, Co, Cr, Cu, Fe, Li, Mn, Mo, Ni, Sb, Se,Sn, Sr, V, W and Zn.ICP-OES technique is shown to be a powerful tool for trace determinations in powder samples. This is shown by its use for analysis of aseries of the milk powders mentioned and comparative results of other direct technique such as instrumental neutron activation analysis. Analysis of both standard reference material A-Ⅱ milk powder and NBS Orchard leaves for quality accurance had been completed, and used for a relative method calculate. The importance of the major and trace elements to human health was discussed     

重庆地区云水的飞机观测

1989年10月3～13日,在重庆地区上空1500～4000m 进行了云水和污染气体的飞机观测。结果表明云水大都酸化并污染,亚硫酸根在硫氧酸根中占33.5％。