Eddy characteristics on mass transfer close to free interface

The velocity fluctuations in the immediate vicinity of a free interface were measured with a hot film anemometer. And mass transfer rates and eddy exposure times were analyzed by using the method of deterministic approach. These mass transfer rates were compared with the mass transfer rates by means of concentration measurements in the air-water system. The eddy exposure time distributions obtained from velocity data were skewed toward the lower time value. The contribution of eddies wi:h small exposure time was increased as the liquid became more turbulent. The mass transfer rates were mainly contributed by the Prandtl size eddies and even larger eddies. The mass transfer predictions by the single eddy model employing a deterministic method were in good agreement with the experimental results by independent measurements of concentration.     

电镀综合废水处理技术

电镀行业普遍存在废水处理不够彻底的排放问题。针对这种现状，本文提出首先必须对生产线上的电镀废液进行种类及清污分流，并应用化学絮凝—气浮法一体化的处理技术对综合废水进行处理。试运行情况表明，该处理技术易于控制、占地面积小、运行费用低，处理后的废水可以达到GB8978—1996二级标准，去除率在96％以上，并有65％以上的处理水可以回收利用。     

[(2Y-ZrO2)-Al2O3]纳米微粉制备的研究

本研究采用SoL-GeL法和自动引燃法制备[(2Y-ZrO)-AlO]超微粉,并进行了微观结构分析。为比对223两种超微粉性能的差异,采用注浆成型法制备样品,并分别测定抗折强度,断裂韧性和烧结温度。结果表明:自动引燃制备的ZrO-AlO掺稀土纳米微粉,工艺简单、细小均匀,由其烧造的样品较SoL-GeL法样品抗弯强度高,223断裂韧性好,烧结温度低。     

工业废渣磷石膏用作充填材料的研究

研制了以工业废渣磷石膏为基材的充填材料.改性后磷石膏的耐水性大大增强,抗压强度≥0.79 MPa、渗透系数≤1×10-5cm.s-1,并且具有合适的C、Φ值.     

大丝束聚丙烯腈基预氧丝炭化研究

采用正交实验法研究了炭化温度、炭化时间、升温速率等因素对两种聚丙烯腈基预氧丝炭化产物结构和性能的影响.结果表明,进口东邦48 K大丝束聚丙烯腈基预氧丝环化程度优于国产吉林6 K小丝束聚丙烯腈基预氧丝,在炭化温度950℃,升温速率4℃/min,保温时间10 min条件下,炭化可取得最佳性能,炭化产物纤维拉伸强度达2.96 GPa,而国产吉林6 K小丝束在炭化温度1 100℃,升温速率4℃/min,保温时间5 min条件下炭化产物性能最佳,产物炭纤维拉伸强度近3.80 GPa.伴随两种预氧丝炭化过程,纤维颜色加深,表面缺陷减少,拉伸断裂模式均由假塑性向脆性过渡,为复合材料低成本开发中预氧丝坯体制备与炭化工艺提供了参考依据.     

常见塑料溶解性能研究及其混合物的选择性分离

以常见塑料为原料,以有机物为溶剂,研究了塑料在有机溶剂中的溶解性能,提出了选择性分离混合塑料的方案。结果表明,实验所选用的塑料在有机溶剂中的溶解性能和溶解条件不同;可利用塑料与有机溶剂的相容性差别分离混合塑料。     

浅谈几种钢丝编织机的结构原理及性能特点

介绍了国产GBG，美国RB-2、TMW225-11，德国MR-11，意大利DAK，韩国BW等型号的钢丝编织机的编织机构的结构特点，分析了各种编织机梭子的传递过程。随后总结了各种编织机的性能特点并进行了分析讨论，认为至今没有先进的国产编织机研发成功的主要原因在于成本价格过高及制造技术水平达不到。     

Biodegradability and mechanical properties of agro‐flour–filled polybutylene succinate biocomposites

The objective of this study was the production of rice husk flour (RHF) and wood flour (WF) filled polybutylene succinate (PBS) biocomposites as alternatives to cellulosic material filled conventional plastic (polyolefins) composites. PBS is one of the biodegradable polymers, made from the condensation reaction of 1,4‐butanediol and succinic acid that can be naturally degraded in the natural environment. We compared the mechanical properties between conventional plastics and agro‐flour–filled PBS biocomposites. We evaluated the biodegradability and mechanical properties of agro‐flour–filled PBS biocomposites according to the content and filler particle size of agro‐flour. As the agro‐flour loading was increased, the tensile and impact strength of the biocomposites decreased. As the filler particle size decreased, the tensile strength of the biocomposites increased but the impact strength decreased. The addition of agro‐flour to PBS produced a more rapid decrease in the tensile strength, notched Izod impact strength, and percentage weight loss of the biocomposites during the natural soil burial test. These results support the application of biocomposites as environmentally friendly materials. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1513–1521, 2005     

305酯在船用PVC电缆料中应用研究

用305酯（双季戊四醇酯）增塑剂与其他添加剂配合使用，部分取代TOTM（偏苯三酸三辛酯）生产船用105℃PVC（聚氯乙烯）电线电缆料，并对其电性能，浸水后电性能等进行测试分析。结果表明，305酯为主增塑剂剂时，与4～5份的TCP（磷酸三甲酚酯）并用可以显著改善电缆料浸水电性能。在配方中应用二盐基性苯二甲酸铅和二盐基硬脂酸铅作稳定系统，更能保证电线电缆料浸水电性能的稳定。     

水中苯胺类化合物检测8-羟基喹啉试剂盒的研制

本文提出一种能方便、快速、灵敏地检测水中苯胺类化合物的试剂盒。该方法是以N -氯代丁二酰亚胺和 8-羟基喹啉与苯胺的显色反应为基础。显色反庆所得的蓝绿色化合物的最大吸收波长为 6 1 0nm ,在苯胺为 0 .2～ 8mg/L的浓度范围内符合比尔定率 ,最低检出限为 0 .0 1mg/L ,测定的重现性在± 5 %以内。本方法已成功地用于环境水样的分析测定