饲粮锌对蛋鸡生产性能及生殖激素的影响

试验选用66只18周龄商品代伊莎褐育成母鸡。随机分为3组,每组22只,对照组饲喂基础饲粮,试验1、2组在基础饲粮中分别添加601、80 mg/kg的锌,研究不同锌添加水平对蛋鸡生产性能和血清中生殖激素的影响。结果表明,在蛋鸡饲粮中添加锌对产蛋量、耗料量和料蛋比无显著影响（P〉0.05）,但破蛋率略下降,蛋重显著降低（P〈0.05）;试验1组血清中E2含量显著高于对照组（P〈0.05）,与试验2组无显著差异（P〉0.05）;试验2组与对照组亦无明显差异（P〉0.05）;而血清中P4含量3组间无显著差异（P〉0.05）。     

高层建筑设计中箱基的埋深和沉降差异探讨

结合工程实践 ,从设计的角度对高层建筑箱基的埋置深度和主楼与裙房间沉降差异的解决措施进行了讨论 ,提出了一些处理实际工程问题的措施 .     

二氢吡啶对蛋鸡产蛋性能的影响

取３００日龄罗曼蛋鸡１５３６只,随机分为４组（每组设４个重复）,在自由采食,饮水和光照１６ｈ的条件下,分别饲喂添加０ｍｇ／ｋｇ,１０ｍｇ／ｋｇ,１５０ｍｇ／ｋｇ,２００ｍｇ／ｋｇ二氢吡啶 的玉米,豆煌局粮９０ｄ。结果表明：含１５０ｍｇ／ｋｇ,２００ｍｇ／ｋｇ二氢吡啶饲粮,可使日均产蛋率分别提高７．５２％（Ｐ〈０．０１和７．９３％（Ｐ〈０．０１）,料蛋比分别降低５．８１％（Ｐ〈０．０５）和６．２２％     

Pre-ovipositional and ovipositional behaviour of Lasioseius ometes (Oudemans) and Hypoaspis kargi Costa (Acari: Dermanyssiae: Ascidae,Laelapidae) with notes on egg protection strategies in Mesostigmata

Egg deposition by the soil mites Lasioseius ometes (Oudemans, 1903) and Hypoaspis kargi Costa, 1968 was observed using continuous video-monitoring. The process in both species was found to consist of four distinct phases. In Phase 1, both species engage in pre-ovipositional activity prior to the egg being extruded from the genital opening. In L. ometes, the female often selects a substrate depression for egg laying and examines the depression carefully with the gnathosoma and legs I before oviposition. In H. kargi, egg deposition sites are chosen without regard for substrate depressions. Phase 1 lasted approximately 3 minutes for both species. Phase 2 involved egg extrusion and holding of the egg beneath the gnathosoma. Phase 2 lasted approximately 20 times longer in L. ometes (5 minutes) than in H. kargi. Alteration of the egg surface in the form of thorn-like outgrowths was recorded in L. ometes. Egg deposition occurs in Phase 3, and in L. ometes the egg is generally placed at the deposition site using the chelicerae. Hypoaspis kargi also uses the chelicerae for egg manipulation, but also adjusts orientation of the egg with legs I. The sticky nature of egg surface in H. kargi may provide a means for the female to effectively cover the exposed egg with a protective layer of soil particles. Egg deposition in both species occurred in less than 90 seconds. Phase 4 involves egg covering, but behaviour of the female during this last phase differs markedly between the two species. In L. ometes, the female tends to remain close to the egg, whereas in H. kargi the female moves away from the egg to search for substrate particles appropriate for its covering. The average time for Phase 4 in H. kargi was approximately four times longer (80+ minutes) than in L. ometes.     

经编多轴向技术及其在复合材料中的应用

介绍了经编多轴向衬纬技术发展状况,分析了经编多轴向辅层织物作为高性能复合材料增强结构在物理机械性能和经济性方面的优势和巨大的市场潜力     

10kV电力电缆敷设安装探讨

笔者主要阐述了10 kV电力电缆在施工前的检查工作、电缆的敷设方式、电缆敷设时注意事项等方面,保证了电缆线路的施工质量,促进电缆线路施工技术水平的提高,确保电缆线路安全运行。     

淘汰蛋鸭肉质蛋白酶嫩化研究

对木瓜蛋白酶和风味蛋白酶嫩化淘汰蛋鸭肉的效果进行了探讨,比较了酶解条件下鸭胸肉的肌原纤维小片化指数和剪切力的变化,并分析了肌原纤维小片化指数与剪切力的相关性.结果表明:木瓜蛋白酶对鸭肉的酶解作用更强烈,达到相同的嫩化效果(即相同的肌原纤维小片化指数或剪切力值)所需的酶用量大约为风味蛋白酶的一半.嫩化后鸭肉的肌原纤维小片化指数和剪切力之间存在着显著的相关性,木瓜蛋白酶和风味蛋白酶的这种相关性分别为-0.965和-0.950.     

通信电缆敷设质量控制探讨

在通信电缆工程中,电缆铺设是重点管理项目,对工程的进程及工程质量有重大影响。文章从路径的选择、铺设前准备工作、技术措施、施工方法、工程试验和交接等方面对通信电缆的铺设工作进行详细阐述,说明其质量管理的重要性。     

单面羊毛衫添纱织物编织的研究

分析了垫纱横角和垫纱纵角对羊毛针织绒线在织物中显现情况的影响规律,推导出了横机纱线断面轨迹方程,通过上机确定了编织毛盖棉织物时较理想的垫纱角度．     

太阳能小屋的最优设计

研究了太阳能发电装置的电池组件选配问题,建立了双目标规划模型,并进行了求解.有效地设计出太阳能光伏电池板最优铺设方案,并给出了光伏电池逆转换器配置办法,提出了一种比较经济的太阳能小屋设计办法.