分析用水对陶瓷铅溶出量测定的影响

分析用水水质对日用陶瓷铅溶出量测定具有重要影响,CL-、SO42-、CO2等严重抑制铅的溶出,使测定结果偏低。     

核壳型含氟丙烯酸酯共聚乳液

以十二烷基硫酸钠（SDS）和壬基酚聚氧乙烯基醚（OP-10）为复合乳化剂，甲基丙烯酸十二氟庚酯（Actyflon-God）、甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）为原料制备了壳层含氟的核壳型丙烯酸酯共聚物乳液。用红外光谱（FT—IR）表征乳胶膜化学组成，用透射电子显微镜（TEM）观察了乳胶粒的微观形态结构，并用X射线光电子能谱（XPS）进行了表面分析。发现氟有向空气与膜面迁徙的现象。通过吸水率表征含氟丙烯酸酯共聚物乳胶膜的表面性能，结果表明含氟量增加使乳胶膜吸水率大大降低。     

微生物絮凝剂产生菌HHE-P7的最佳培养条件研究

HHE-P7为从活性污泥中筛选出的一株高效絮凝剂产生菌。通过实验确定了HHE-P7最优营养成分和培养条件:葡萄糖为碳源,酵母膏作氮源,培养基初始pH=5.0,250mL三角瓶中装液量为140mL,种子接入量为培养液容积的2%,摇床温度30℃、转速150r/min。在此操作条件下培养2d后,所产微生物絮凝剂对高岭土悬液的凝絮率为97%,絮凝剂粗品产量达4.0g/L。     

纳米二氧化钛的杀菌性能测试

采用新工艺制备出具有光催化性的纳米二氧化钛。为了验证其杀菌性，以工业循环冷却水中的异养菌为实验对象进行杀菌实验，结果表明：自制纳米二氧化钛具有良好的杀菌性，杀菌率可达99．2％，而且可以回收，循环使用，产品有广阔的应用前景。     

Coal liquefaction by in-situ hydrogen generation.: 2. Zinc-water model compound reactions

Model compound studies were carried out to elucidate the reaction mechanisms taking place during the liquefaction of coal with the hydrogen produced from the reaction of zinc and water. In compounds of the type Ph-(CH₂)_n-Ph the splitting of the aliphatic bridge was easier with higher n values. Ether type compounds such as diphenylether were unreactive although the C-O bond in dibenzylether was easily cleaved. Condensed ring aromatic compounds gave low conversion with hydrogenation being facilitated by an increase in ring number. Phenolic compounds such as phenol did not react well, but the reactivity increased with increase in aromatic ring size. The cleavage of the aliphatic bridge was accelerated by the OH group, for example, in the case of 4-hydroxydiphenylmethane bond scission was about 15 times higher than that of diphenylmethane. Heterocyclic compounds were unreactive.     

Effect of nitrogen,phosphorus and soil and crop residues management practices on maize (Zea mays L.) yield in ultisol of eastern Cameroon

The shortening of fallow period in several areas in tropical Africa has reduced soil fertility and exposed soils to erosion and run-off. Fertilizer application and crop conservation practices are needeed to sustain high crop yield and to conserve the natural resource base for upland crop production in the continent. Field trials were carried out to evaluate the effect of fertilizer application and soil and crop residues management practices on yield of maize (Zea mays L.) planted on a Plinthudult soil at Bertoua, Eastern Cameroon. Maize yields increased significantly with nitrogen and phosphorus fertilizer application. Under the rainfall pattern prevailing in the area, the amount of nitrogen required for maximum yield was higher in the second season. On the other hand, the amount of phosphorus required for maximum yield appeared to decrease with time. The burning of crop residues and weeds prior to planting together with no-till practive gave higher yield of maize than other soil and crop residues management practices.     

Assessing the sustainability of non-renewable brackish groundwater in feeding an RO desalination plant in Bahrain

The Rus-Umm Er Radhuma aquifer in Bahrain is a non-renewable source of brackish water (8-15 g/L), which forms a lens underlain everywhere with brines of over 100 g/L. Aquifer utilization has started in 1984 to feed a reverse osmosis (RO) desalination plant, with an economic life of 25 years (2010). Future plant upgrade strategy is formulated around boosting the plant production, which will require increasing the we llfield abstraction, in addition to a possible future rehabilitation program to extend the plant life by another 15 years (2025). The limiting factor in expanding the RO plant and its rehabilitation is the future feed water salinity, which have to be assessed before any investments are made to expand the RO plant and commission additional abstraction wells and implement the rehabilitation program. The aquifer management is based on mining a one-time brackish water reserve stored in the aquifer, the main management objective is stated as to sustain the aquifer future availability in feeding the desalination plant with a specified salinity limit of 20 g/L over the economic life of the plant of 25 years (1985-2010), and also over the plant extension period by rehabilitation (2010-2025). The stochastic analysis methodology utilizing conditional simulation is applied to conduct a risk assessment of violating these two pre-specified sustainability constraints under the proposed abstraction increase; and provided a tool to aid the decision-making process in the development and management of the aquifer under large uncertainties. Simulation results indicated that the risk of having the salinity of the wellfi eld produced water to increase due to the proposed increase in the wellfield abstraction to reach 20 g/L over the economic life of the plant (2010) is very small and minimal. However, it is questionable that the feed water salinity will be maintained under the proposed rehabilitation program to extend the plant economic life by another 15 years (2011-2025). For this option, it is recommended that model post-auditing be performed, and new updated predictions should be made as more data of potentiometry. salinity. and hydraulic parameters become available.     

用循环经济理念自主创新治理DSD酸氧化废水的新路

本文阐述了在循环经济理论指导下,依靠科技进步自主创新改革氧化工艺,开创了治理DSD酸氧化废水的新路:源头上减少资源的投入,实现″减量化″;末端采用资源化处理技术,回收废水中有用的资源,实现″再利用″、″再循环″。成功的解决了曾经困扰DSD酸行业发展的老大难问题,促进了我国DSD酸工业的发展,从DSD酸生产和出口大国正发展成为强国。     

Effect of test frequency and water content on localized crack-tip heating in nylon-6,6

Fatigue crack propagation (FCP) tests were conducted at various frequencies on nylon-6,6 specimens equilibrated over a range of moisture levels to determine the crack growth rates and the crack-tip temperatures as a function of water content. Frequency-sensitivity was correlated with the amount of crack-tip heating taking place, with crack-tip temperature being found to depend strongly on the estimated loss compliance, D″, of the material. The frequency-sensitivity of FCP in nylon was seen also to be affected by mean stress, suggesting that creep processes are often significant in FCP of nylon.     

中央空调的水处理

本文扼要介绍了中央空调循环冷却水和冷冻水系统中常见的问题及其原因,并对冷却水和冷冻水的处理程序作了初步的阐述.