A study on the interactions among several plant secondary compounds and aphids

The research, focused on the specific interactions among seven plant secondary compounds and aphids, was carried out and the preliminary results showed: (1) "T-typed tube method" was regarded as the best method compared with others designed to observe the interactions. (2) Cabbage aphid was able to be attracted by laurolene while it was not susceptible to α-pinene, β-pinene and diamylene. (3) Gossypol, a major secondary substance in cotton, was able to be implicated as feeding attractant to cotton aphid. (4) Rutin might be implicated repellent to cotton aphid.     

温差拉深法在制造大型杯形件中的应用

用温差拉深法制造大型杯形件毛坯,可避免毛坯拉断和起皱,最大限度地降低拉深系数、减少拉深次数、降低加工成本。     

大直径TA2卷焊坯制备工艺

此文介绍尺寸为φ1547×L900×δ30的大直径TA2卷焊坯的制备工艺。主要包括卷焊坯设计、展开下料的计算、卷圆工艺、焊接工艺等,可供同类材质圆筒件卷圆时参考。     

Interfacial effects of suspended particles on biodegradation of N (2,4 dimethyl phenyl) N'' methylformamidine hydrochloride and dibutyl phthalate in waters

ＩｎｔｅｒｆａｃｉａｌｅｆｅｃｔｓｏｆｓｕｓｐｅｎｄｅｄｐａｒｔｉｃｌｅｓｏｎｂｉｏｄｅｇｒａｄａｔｉｏｎｏｆＮ（２，４ｄｉｍｅｔｈｙｌｐｈｅｎｙｌ）Ｎ’ｍｅｔｈｙｌｆｏｒｍａｍｉｄｉｎｅｈｙｄｒｏｃｈｌｏｒｉｄｅａｎｄｄｉｂｕｔｙｌｐｈｔｈ...     

Environmental impact of China''''s village and township industry(1988-1992): a comparison with urban industry

１ＩｎｔｒｏｄｕｃｔｉｏｎＶｉｌａｇｅａｎｄｔｏｗｎｓｈｉｐｉｎｄｕｓｔｒｙ（ＶＴＩ）ｉｓｂｅｃｏｍｉｎｇａｖｅｒｙｉｍｐｏｒｔａｎｔｃｏｍｐｏｎｅｎｔｏｆＣｈｉｎａｓｅｃｏｎｏｍｙａｎｄｅｎｖｉｒｏｎｍｅｎｔ．Ｉｎ１９９２，ＶＴＩｐｒｏｄｕｃｅｄ...     

磺酰脲类除草剂的残留分析

磺酰脲类除草剂是一类新型超高效除草剂，大约包括２Ｖ化合物，已被广泛用于禾谷作物防除阔叶杂草以及某些禾本科杂草，该类除草剂在环境中的残留浓度〈１μｇ．ｋｇ＾－１水平。常规的分析方法包括生物鉴定，酶免疫分析，气相色谱法和高效液相色谱法（ＨＰＬＣ）、ＨＰＬＣ／ＭＳ联用后，可以准确测定复杂环境样中磺酰脲类除草剂的痕量残留。     

Preliminary study on organic contaminants in the water of northwest part of the Lake Chao

The waterquality of the downstream of Nanfei River and the northwest area of Lake Chao is evaluated from organic analysis aspect. PAHs such as fluoranthene, pyrene are detected in the waters collected from downstream river and river mouth. More phenolic compounds are found in the river water. Some halogenated hydrocarbons are present in the river and lake waters. A great many of aliphatic hydrocarbons and benzene hydrocarbons found in all the water samples are about one third of the total organics detected. The hydrophobic components are found to be present not only in water but also in suspended sediment. The ratio of the amount existing is 0.4 in sediment and 1 in particle-free water. The quantity of humic materials existing in lake water is larger than that in river water. The proportion of the humic materials in lake water to that in river water is 1.9 to 1. In the lake water, some natural substances, such as dimethyl disulfide, alpha-pinene, azulene, and 6- methyl -2-heptanone are observed.     

Assay of some volatile compounds in human exhalation

ＡｓａｙｏｆｓｏｍｅｖｏｌａｔｉｌｅｃｏｍｐｏｕｎｄｓｉｎｈｕｍａｎｅｘｈａｌａｔｉｏｎＱｉｎＴａｏ，ＸｕＸｉａｏｂａｉＲｅｓｅａｒｃｈＣｅｎｔｅｒｆｏｒＥｃｏＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅ...     

含硫污水系统耐蚀材料的筛选与应用

针对西北地区一综合炼油厂含硫污水管线的严重腐蚀问题，分析了腐蚀原因，确立了材料筛选方案，通过实验室静态挂片试验绘制了重量损失率变化曲线和现场挂片等试验手段，筛选推荐出了树脂玻璃钢耐蚀材料。工业生产应用结果表明，MFE-2型树脂玻璃钢是适用于该厂含硫污水系统的耐蚀材料，为类似装置的长周期运行提供了借鉴和经验。     

Atmospheric pollution in Beijing, China, as recorded in sediments of the Kunming Lake

The fluxes of heavy metals and magnetite, a fly-ash component, from coal burning, to sediments of the Kunming Lake in Beijing have increased measurably over the last fifty years. Ages were introduced to the sediment strata through Pb-210 geochronologies. Even with a doubling of coal usage by the year 2000, the anthropogenic metal fluxes will still be less than those recorded in metropolitan Tokyo and U.S. lakes.