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71.
72.
减速箱橡胶油封漏油是一个尚未解决的一个棘手问题 .从摩擦学的角度分析 ,漏油的原因主要是油封与转轴接触部位不符合摩擦学的要求 ,造成此处的摩擦系数过高 ,油封磨损过快 .介绍了几种降低橡胶油封与转轴之间摩擦系数的方法 相似文献
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波纹杂毛虫综合防治试验 总被引:6,自引:1,他引:6
波纹杂毛虫幼虫 [Cyclophragmaundans (walker) ]是马尾松林又一害虫 ,用 2 5 %溴氰菊酯 2 5 0 0倍液、4 0 %氧化乐果80 0倍液、80 %敌敌畏乳油 15 0 0倍液、5 0 %甲胺磷乳油 10 0 0倍液 ,防治效果可达 92 %以上。用 2 5 %溴氰菊酯乳油加白僵菌纯孢子油剂 1∶80采取超轻型飞机超低容量喷雾 ,防治效果可达 95 %以上。在气象条件适宜情况下 (地面温度呈逆增时 ) ,在凌晨施放林丹烟剂加 2ml的 2 5 %敌敌畏乳油 ,用量 15kg·hm-2 ,对 2~ 4龄幼虫防治效果可达 95 %以上。 相似文献
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以阿拉伯胶和明胶为壁材的凝聚法生产茶油微胶囊的工艺过程及条件如下5%阿拉伯胶和5%明胶与一定量油茶籽油在60℃下乳化1min,在pH4.4下凝聚0.5h,10℃下固化1h,经离心和真空干燥即可.该法制备的微胶囊,有较高的含油率和包埋率.其粒径与凝聚时的搅拌速度密切相关,但其水溶性较差. 相似文献
78.
Jason Q.D. Goodger Christine A. Connelly Ian E. Woodrow 《Forest Ecology and Management》2007,250(3):196-205
The value of eucalyptus oil for medicinal purposes is based largely on its cineole content. The prime commercial species for cineole production in Australia is Eucalyptus polybractea (blue mallee). Despite the long history of blue mallee harvesting in Australia, there has been little research on the establishment of plantations of the species or on the efficacy of short-rotation coppice cultivation with respect to the consistency of oil yield and quality from rotation to rotation. This study aims to assess if subsequent coppice oil traits reflect sapling traits and if the coppice oil traits under short-rotation cultivation are consistent from one rotation to the next. A trial plantation was established in a key eucalyptus oil harvesting district in Victoria. Firstly, the oil-related traits of 20 saplings harvested 3.5 years after planting were compared with those of their subsequent coppice harvested after 12 months regrowth. Despite the expected differences in total biomass, the oil-related traits of blue mallee saplings were mostly well reflected in their subsequent coppice. Total above ground biomass and foliar oil concentration were significantly related between saplings and coppice, and cineole proportion showed a Pearson's correlation of 0.93 between harvests. Nevertheless, the mean foliar oil concentration in the coppice was 148 mg g−1 dw compared with 107 in the saplings, and the coppice foliage, on average, showed significantly reduced cineole with a mean of 87% in the saplings (maximum of 95.6%) compared to a mean of only 80% in the coppice (maximum of 87.0%). Secondly, the oil traits of 20 coppice plants from one 12-month harvest rotation to the next were compared. Again, total above ground biomass, foliar oil concentration and cineole proportion were significantly related between the harvests, with cineole proportion having a Pearson's correlation of 0.90 between rotations. The coppice between rotations were remarkably consistent in terms of biomass and oil traits and indeed mean coppice cineole yields were 28.6 and 29.7 g in rotations 1 and 2, respectively. The results support the screening of key oil-related traits in saplings for the selection of elite genotypes for plantations, and the use of short-rotation cultivation of the plantations for continued oil harvesting. Furthermore, no relationship was observed between biomass and oil concentration in the blue mallee saplings or coppice, suggesting selection gains in a given key oil trait will not result in losses in another. 相似文献
79.
Two new amino acid-type amphoteric surfactants — disodiumN-(2-fatty acyl amino) ethyliminodiacetate and disodiumN-(2-fatty acyl amino) ethyl-N,N-bis[3-(2-hydroxy) propylsulfonate] amine — were synthesized using tall oil fatty acids as the raw material. Suitable processing conditions for synthesizing the intermediates and final products were probed. In addition, the chemical structures of the intermediates and the final products were identified by infrared spectroscopy, hydrogen nuclear magnetic resonance spectroscopy, and elemental analysis. 相似文献
80.
Sheng-Yang Wang Wan-Chi Lai Fang-Hua Chu Chien-Tsong Lin Shi-Yen Shen Shang-Tzen Chang 《Journal of Wood Science》2006,52(6):522-526
This is the first article to report the evaluation of a natural product used as an antisilverfish agent. Silverfish (Lepisma saccharina), primitive wingless insects, feed on a variety of materials, including paper, cotton, starch, and cereals. They can be a
problem in libraries and other places where books, documents, and papers are stored. In this pilot study, the essential oil
from leaves of Cryptomeria japonica was investigated to test its properties as a silverfish repellent and insecticide. The results from a repellency bioassay
show that the essential oil significantly repelled silverfish. The repellent activity was 80% at a dosage of 0.01 mg/cm3. When silverfish were exposed to a concentration of 0.16 mg/cm3 of essential oil, they were killed within 10h. The chemical composition of essential oil, the emissions from a test chamber,
and the residue left on filter papers previously soaked with the essential oil in a chamber were analyzed by gas chromatography-mass
spectrometry. The components of the essential oil were found to be: elemol (18.22%), 16-kaurene (11.63%), 3-carene (9.66%),
sabinene (9.37%), 4-terpineol (9.06%), β-eudesmol (5.70%), α-pinene (5.62%), and limonene (5.26%). Only some constituents of the essential oil compounds collected by solid-phase microextraction
were found to be emitted in the test chamber. The main constituents were: 3-carene (21.03%), p-cymene (10.95%), limonene (9.49%), β-myrcene (9.39%), γ-terpinene (9.10%), α-terpinene (8.57%), and 4-terpineol (7.97%). 相似文献