高压全膜电力电容器用新浸渍剂苄基甲苯的研究

进行了由氯化苄与甲苯合成苄基甲苯的工艺研究,筛选了精制方法.合成和精制后的油品,检测了理化电性能,作成模型电容器进行各种试验,表明该绝缘油具有优异的性能.     

莫能菌素浓度对混合瘤胃微生物体外发酵的影响

本试验研究了莫能菌素对混合瘤胃微生物体外发酵的影响 ,以期确定莫能菌素在瘤胃内容物中的适宜添加浓度。混合瘤胃微生物由饲喂花生秧基础日粮的阉公牛瘤胃内容物和瘤胃液制备 ,用简易人工瘤胃装置测定莫能菌素浓度对产气量、瘤胃乙丙酸比例、粗纤维降解率和真蛋白产量的影响。结果表明 ,莫能菌素浓度强烈地抑制产气量 ,两者呈线性负相关(P<0.05);粗纤维降解率开始时随莫能菌素浓度的升高而增加 ,在浓度为0.078mg/L时达到最大值 ,两者呈二次幂函数关系 ;添加莫能菌素降低了瘤胃乙丙酸比例 ,但瘤胃乙丙酸比例随莫能菌素浓度的提高有逐渐增加的趋势 ;在莫能菌素浓度为0.1～2.0mg/L的范围内 ,添加莫能菌素对蛋白质的产量没有明显影响     

微生物谷氨酰胺转胺酶(MTG)分批发酵模型的建立

在本文中，以本实验优化好的工艺条件，建立了关于微生物谷氨酰胺转胺酶分批发酵的数学模型方程细胞生长的动力学方程、产物合成的动力学方程和底物消耗的动力学方程。并对所建立的动力学方程进行了生物统计分析，结果表明所建立的模型具有一定的可信度。     

造林新材料在岱山海岛造林中的应用

通过3种造林新材料在岱山海岛造林中的应用,观测它们对提高造林成活率的影响.结果表明:3种造林新材料对提高夹竹桃Nerium indicum造林成活率基本没有影响,科瀚98对枫香Liquidambar formosana和银杏Ginkgo biloba造林成活率影响较小.植树宝、科瀚98和GGR可显著提高女贞Ligustrum lucidum,重阳木Bischofia javanica,香樟Cinnamomum camphora和木荷Schima superba的造林成活率.图1表1参6     

Effect of ruminal dosing of mechanical stimulating brush on rumination time, ruminal passage rate and rumen fermentation status in Holstein steers fed a concentrate diet

This experiment was conducted to determine the effect of ruminal dosing of a mechanical stimulating brush on rumination time, ruminal passage rate and rumen fermentation status in steers fed a concentrate diet at maintenance level. Animals were dosed three Rumen Faibu (RF) per head through the rumen fistulae (RF treatment) and not dosed (control) in a change‐over design. The organic cell wall content of the concentrate diet was 12.7% of dry matter. Daily time spent on rumination was very short in both treatments with 24 min in RF treatment and 15 min in control. The turnover rate of ruminal fluid in RF treatment was higher than that in control. There were no differences in ruminal pH and total volatile fatty acid concentration between RF treatment and control. Acetic and butyric acid concentrations were not different between the treatments. Propionic acid concentration tended to be higher in the animals on RF treatment than in control animals. The RF dosing in Holstein steers fed a low fiber diet did not affect the rumination time, but increased rumen digesta passage rate and ruminal propionic acid production.     

用分析型透射电镜观测铁磁样品的研究

This paper demonstrats the observability criterion of the magnetic-material film electron metallo-graphy made by analytical transmission electron microscopy. We deal with successfully the observations of bearing steel metallo-graphy and high chromium east     

夏大豆亩产262.1kg生理指标研究

研究了夏大豆中油－８９Ｄ亩产２６２．１ｋｇ各项生理指标：叶面积系数，开花期、结荚期、鼓粒期分别为３．９８、５．８０、４．９１；总光合势１８．２万ｍ＾２·日，平均净光合生产率４．８１ｇ／ｍ＾２·日，氮磷总积累量分别为２２．２８ｋｇ和３．１３ｋｇ，每生产１００ｋｇ籽粒需吸收氮８．５０ｋｇ，磷１．１９ｋｇ，总干物质积累８７６．４７ｋｇ，粒茎比０．５１，经济系数０．３０。     

Ⅰ型边缘单裂缝的计算机模拟

对素混凝土构件以及具有钢筋强化的混凝土构件在线弹性范围内Ⅰ型边缘单一裂缝的开口进行了模拟。通过模拟发现,在混凝土材料的基体内配置钢筋,使得裂缝的开口位移明显减小。为此,分析了在素混凝土材料的基体内垂直于裂缝的不同位置配置钢筋对构件裂缝开口位移的影响。     

饱和软粘土深层搅拌加固法原理初探

随着工程建设的发展,在深厚软土层上建造大型工业建筑、高层房屋及港口码头工程日益增多,因此软粘土加固技术越来越受重视。纵观现有的加固方法各有其不适应性,因此需要大力开发研究新的加固技术。     

Effect of live weight and dietary supplement of raw potato starch on the levels of skatole, androstenone, testosterone and oestrone sulphate in entire male pigs

This study evaluated the effect of supplement of raw potato starch (RPS) on the levels of skatole, androstenone, testosterone and oestrone sulphate in plasma from entire male pigs. The study also evaluated relationships between plasma levels of skatole and testicular steroids at three different live weights (LW) of approximately 90, 100 and 115 kg. A total of 111 entire male pigs of a crossbred (Yorkshire dams×Swedish Landrace sires) were used. Animals were raised either in mixed pens, with females and males, or single-sex pens. Each pen contained seven or nine pigs. The most fast-growing three pigs from the pens with nine pigs were slaughtered when they reached 90 kg LW, and the remaining pigs were slaughtered at 115 kg LW. All pigs were fed the same commercial diet until the average pen weight reached 100 kg. Then, 33 out of 80 remaining pigs received RPS, 0.6 kg per pig and day, for 2 weeks prior to slaughter. Blood samples were taken from the pigs at three occasions: first, the day prior to first slaughter occasion, low-weight group; second, the day prior to change in diet, middle-weight group; and third, the day prior to second slaughter occasion, high-weight group. Plasma was analysed for the levels of skatole, androstenone, testosterone and oestrone sulphate. Fat samples were taken at slaughter and analysed for the levels of skatole and androstenone. The levels of skatole and testicular steroids in plasma were significantly higher in entire male pigs from the high-weight group fed no RPS compared to those from low- and middle-weight groups. The levels of the investigated compounds did not differ between low- and middle-weight groups (P>0.1). The diet with RPS induced a decline in skatole levels in plasma and fat (P<0.001), but not plasma levels of testicular steroids and fat levels of androstenone (P>0.05). Skatole levels were positively correlated to testosterone and oestrone sulphate levels in the middle- and high-weight pigs fed no RPS as well as to testosterone in the low-weight group. In the high-weight group fed RPS, skatole levels were not correlated to any of the analysed compounds. Approximately 26% of the entire male pigs (11 out of 43) from the high-weight group fed no RPS produced skatole levels in fat above 0.20 μg/g, whereas the pigs from the low- and high-weight group fed RPS did not produce skatole levels above 0.20 μg/g in fat. Androstenone levels in fat were high in all groups. In total 47% (52 out of 111) pigs expressed androstenone levels above the rejection levels in fat of 1.0 μg/g and 88% (98 out of 111) had androstenone levels above 0.5 μg/g. It was concluded that a lower slaughter weight and the supplement of raw potato starch to the diet could be used to reduce skatole levels in entire male pigs. Androstenone levels in fat, however, could not be reduced by either a lower weight at slaughter or dietary manipulation.