A NEW METHOD OF COMPUTING MULTI-COMPONENT E-pH DIAGRAMS

Aqueous E pH Diagram is an essential tool for analyzing hydrometallurgical and corrosion processes. Due to the requirements for environmental protection and energy saving in recent years, waste water processing and hydrometallurgical process of concentrate have been greatly developed. The construction of E pH diagrams has turned to multi component systems. However, there are some limits in plotting such diagrams. There is only one diagram for one multi component system, which can not reflect the truth of the aqueous reaction. In the paper, a new computation method is proposed to construct E pH diagrams. Component activity term is used to determine the boundary of stable areas. For the multi component systems, different atom ratios of elements have been taken into account. M S H 2O system is chosen to study since it is of importance in metallurgical solution. Compared with conventional methods, the algorithm is simple and conforms to real conditions.

基于A/O工艺的油田含聚掺混污水深度处理效能研究

油田含聚污水的回注和深度处理是油田含油污水处理的难点。研究将油田含聚污水与生活污水掺混,采用A/O工艺,通过投加电子受体SO_4^(2-),控制优化C/S比为0.68,考察含聚掺混污水的深度处理效果。研究表明,HPAM去除率达到17.5%,厌氧段COD的去除率23.4%,好氧段COD降低56.3%,SO_4^(2-)去除率为90%,含油量去除率为95%,出水的悬浮物均值小于5mg/L。厌氧段ORP控制在-530^-520mV之间,生物法对HPAM有一定的降解能力,其聚合物的溶液粘度降低80%,聚合物失去了原有的重要的粘滞性功能。生物出水远高于现有含聚污水回注标准,达到了普通含油污水"511"回注的标准,该研究为油田含聚污水深度处理提供了技术和理论的支持。

入侵杂草五爪金龙有性繁育系统的初步研究

【目的】定点观察粤东地区农林业入侵杂草五爪金龙(Ipomoeacairica L.)的开花动态,并研究其有性繁育系统类型。【方法】在生态学外业调查的基础上确定4个样地,观察五爪金龙开花动态,计算花粉-胚珠比(P/O)、种子-胚珠比(S/O)、花粉活性率、柱头可授率和杂交指数OCI。【结果】五爪金龙花粉-胚珠比(P/O)为2224,种子-胚珠比(S/O)为0.56,介于兼性异交与专性异交之间,以异交为主。五爪金龙开花期持续时间长,结实期短,单花开放时间仅为1d。花粉活性率和柱头可授率在一天中均呈现抛物线趋势,且各自的最高峰分别出现在上午09:30与下午14:30～15:30;杂交指数OCI=5,为部分自交亲和,异交,需传粉者。【结论】五爪金龙繁育系统类型为混交繁育系统,即自交和异交并存;建议对五爪金龙采用全株清除的人工防治措施。

钢-竹组合箱形梁抗剪性能试验

以两根对立放置的冷弯薄壁U型钢作为箱形骨架,骨架外表面通过结构胶黏剂黏结4块竹胶板,制成钢-竹组合箱形梁。试验以箱形组合梁翼缘、腹板竹胶板厚度、冷弯薄壁U型钢翼缘宽度和组合梁剪跨比为控制参数,对6根钢-竹组合箱形梁进行抗剪性能试验,测量各级荷载作用下组合梁应变和挠度的发展,分析组合梁的受剪破坏过程和破坏机制,探讨了组合梁的抗剪性能。试验结果表明,钢-竹组合箱形梁的整体工作性能十分良好,冷弯薄壁型钢和竹胶板组合效应明显,组合梁翼缘、腹板竹胶板厚度的增加,可以提高其极限抗剪承载力,与此同时,组合梁剪跨比的减小也能使其抗剪能力有较大提高。研究表明,组合梁破坏经历两个阶段,即弹性阶段和弹塑性阶段,具有良好的延性和安全储备,能够作为受力构件用于建筑工程。

超声弹性应变率比值对乳腺癌腋窝淋巴结转移的鉴别诊断价值

目的:探讨弹性应变率比值对可疑乳腺癌患者腋窝淋巴结转移的诊断价值。方法:对78例乳腺癌患者的78个同侧腋窝淋巴结进行二维超声和弹性成像检查,测量淋巴结与皮下组织弹性应变率比值,结果与病理对照。结果:腋窝转移性淋巴结的弹性应变率比值明显高于非转移的弹性应变率比值[(3.93±1.57)与(1.65±1.59)P<0.05]。弹性应变率比值诊断腋窝淋巴结转移的曲线下面积为0.912。以1.98为截断点,弹性应变率比值鉴别乳腺癌腋窝淋巴结转移的敏感性、特异性和准确性分别为90.9%、79.4%、85.9%。结论:超声弹性应变率比值是一种鉴别乳腺癌腋窝淋巴结转移的客观、有效方法。