地铁型材模具的探讨

介绍了大型铝型材的特点 ,大型铝型材模具的设计 ,分流比的选择 ,分流孔位置的布置 ,芯头颈部的选择 ,工作带的确定以及加工中的注意事项     

铁路工程建设可持续发展战略的研究

提出了铁路建设走可持续发展之路，论证了铁路工程建设、环境与地质灾害三者的相互关系，阐述了在铁路工程建设的各个环节树立环境保护和防灾减灾的重要性。     

刚玉冶炼电炉烟尘回收的环境意义

电弧炉冶炼棕刚玉过程中产生大量烟尘，排放到大气中严重污染环境。为全面评估刚玉冶炼电炉烟尘对环境的影响，本文对贵州某厂３０００ＫＶＡ及７５００ＫＶＡ两组电炉，采用电收尘及布袋收尘前后的１２个状态和２４个系列进行预测计算与分析，结果表明；采用电收尘或布袋收尘后，电炉周围的大气环境质量显著改善，由三级的恶劣状态变为一级的优良状态。     

灰化-火焰原子吸收法测定人发中的金属元素

讨论了人发中元素测定的前处理条件，并采用灰化－火焰原子吸收法测定了人发中锌，铜，铁，钙和镁５种金属元素的含量。     

用醌式染料的合成反应光度法测定水中亚硝酸根

研究了以Ｎ，Ｎ－二甲基苯胺为偶联试剂，利用醌式染料的合成反应测定ＮＯ２＾－的新方法，ＮＯ２＾－在０￣１８．０μｇ／２５．０ｍＬ范围内服从比尔定律，方法具有较高的灵敏度和选择性。试剂及醌式染料具有更高的稳定性，且无试剂空白的影响，用于环境水中ＮＯ２＾－的测定，其结果与其他方法的测定结果一致。     

废旧塑料热解催化及其产物分析

采用热解──催化法使废旧聚乙烯塑料裂解，并对裂解产物进行ＧＣ／ＭＳ分析．结果表明，废旧聚乙烯塑料的裂解产物主要由正构烷烃、烯烃及少量环烷烃组成．这些化合物均具有重要的回收利用价值．     

Propane oxidation and steam reforming over Pd/LaFe(0.8) Co(0.2) O3 catalyst: effects of the reactant composition and steam

The effects of reactant composition and steam on propane combustion over Pd/LaFe0.8Co0.2O3 catalyst were investigated.Propane conversion and the oxidation state of palladium were strongly affected by the redox ration of reactants.Higher propane conversion could be obtained under rich conditions and explained as a complex balance between oxidation and steam reforming.Water produced in the oxidation could promote the propane conversion by steam reforming.However,the presence of excess steam would bring about inhibition.     

Soil water depletion under various leguminous cover crops in the derived savanna of West Africa

Leguminous cover crops have the potential of making cropping systems in the tropics sustainable if they would not deplete resources such as soil water and nutrients to the detriment of companion crops. Therefore, a study was carried out at Alabata, Ibadan, southwestern Nigeria, to evaluate the effects of leguminous cover crops on soil water suctions in 1993 and 1994 in order to assess the possibility of integrating them into the farming systems of the savanna zone of West Africa. In 1993, 13 leguminous cover crops (Aeschynomene histrix, Centrosema brasilianum, Centrosema pascuorum, Chamaecrista rotundifolia, Cajanus cajan, Crotalaria verrucosa, Crotalaria ochroleuca, Lablab purpureus, Mucuna pruriens, Psophocarpus palustris, Pseudovigna argentea, Pueraria phaseoloides and Stylosanthes hamata) were planted in a randomized complete block design with four replications. Maize and natural fallow (mainly Chromolaena odorata and Imperata cylindrica) were included as comparisons. Only six of the legumes (A. histrix, C. pascuorum, C. cajan, C. ochroleuca, M. pruriens, and P. phaseoloides) were included in the measurements in the 1994 new plots. Soil water suctions at various stages of legume growth were measured at daily or weekly intervals (depending on the frequency of rainfall events) using tensiometers installed at 0–15 and 15–30 cm soil depths. Soil water suctions exceeding 10 kPa (theoretical field capacity) were observed mainly between 6 and 12 weeks after planting (WAP), and by 20 WAP when cover crops had matured and rainfall frequency was very low. Soil water suctions were significantly related (r²>0.80) to dry matter between 8 and 10 WAP. The studied cover crops were classified in three groups which can be used as a guide for choosing the legumes in tropical farming systems. Soil water depletion was markedly influenced by growth characteristics of legumes and distribution of rainfall during the rainy season. Leguminous cover crops conserved soil water after their growth needs were satisfied.     

PH玻璃电极对比观测及误差研究

经过对PH玻璃电极对比观测实验,总结其在日常观测中衰减变化规律,以及PH电极失效前所具有的特征;讨论了对现有PH观测数据进行修正的方法,并编著相关修正程序;分析日常存在的测量误差,提出提高观测精度的措施。     

N-苯基-2-萘胺和N-苯基-1-萘胺籍分离的大鼠肝细胞的代谢

具有致癌性的抗氧化剂N—苯基—2-萘胺(P2NA)和N—苯基—1-萘胺(PINA)在体外籍新鲜分离的大鼠肝细胞进行生物转化.肝细胞培育后的产物经TLC和HPLC分析表明,二者主要代谢产物为酚类.P2NA生成二个酚类化合物,经与标准样品作平行层析证实为6-羟基P2NA和4＇-羟基—P2NA,而P1NA仅生成一个酚类化合物.P2NA经去苯基反应的代谢产物2-萘胺未被检出.