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。     

伊莎褐商品代蛋鸡育成后期体重对早期产蛋性能影响的观察

对９４５只１２５日龄的伊莎商品蛋鸡不同体重组（Ａ组１６００ｇ以上、Ｂ组１４００ｇ～１５９９ｇ和Ｃ组１４００ｇ以下）进行早期（１９～２５周龄）产蛋性能的观察结果：体重在开产前达到１６００ｇ以上时提前开产，达５％、５０％和８０％的产蛋率日龄，体重最重的Ａ组比Ｂ组分别提早７、４和１天，比Ｃ组分别提早１４、７和４天；试验期内的产蛋量，Ａ组比Ｂ组多产蛋６４９枚，合４６．２４ｋｇ．，比Ｃ组多产１６８３枚，合１０９．６５ｋｇ；蛋重与体重呈正比，平均每枚蛋重，Ａ组比Ｂ组多１．４６ｇ，比Ｃ组多２．４２ｇ；在死亡率上，体重最轻的Ｃ组抗病力差、死亡率大，Ｃ组＞Ｂ组＞Ａ组，在经济收益上，各组所创产值是Ａ组＞Ｂ组＞Ｃ组．     

植物叶代替茶叶制作松花蛋的研究

用茶叶制作松花蛋是传统工艺的做法,但其成本较高。试验结果表明,山楂叶和柿子叶代替茶叶制作松花蛋,前者在蛋白的凝固方面优于后者,松花蛋的色泽前者比后者浅,但却很鲜艳,并且有很多大而清晰的松花。试验还同时对Zn和Pb的成色作用进行了对比。通过试验结果结合经济效益分析,认为山楂叶和柿子叶可以替代茶叶制作松花蛋。     

浅析高压旋喷钢筋混凝土桩基技术

以高压旋项注浆技术和桩基技术作为理论基础 ,通过在不同地质条件下的现场实验 ,探讨了在高压旋喷桩中放置钢筋笼和混凝土做成高压旋喷钢筋混凝土桩的可能性、可行性和把高压旋喷钢筋混凝土桩作为基础使用的可靠性和适用范围 ,并进行设计计算。     

芽孢杆菌制剂对蛋鸡肠道微生物和生理指标的影响

为研究芽孢杆菌制剂对蛋鸡肠道微生物区系、生理指标和生产性能的影响,试验选用1日龄蛋鸡,随机分为四组,分别在每t日粮中添加0、50、100和200 g该制剂,饲喂至22日龄时采样分析.结果表明,试验组鸡肠道食糜中乳酸杆菌的菌落数目显著高于对照组(P0.05),且该制剂可显著降低空肠食糜的p H值(P0.05),添加该制剂后肠道食糜中微生物多样性呈现出减少的趋势,表明芽孢杆菌可改变育雏期蛋禽的肠道微生态环境.另外,试验组的蔗糖、乳糖酶、麦芽糖酶活性、空肠绒毛高度和体增重显著高于对照(P0.05),表明芽孢杆菌可增加育雏期蛋禽对淀粉类营养成分的消化吸收,从而增加体增重.最后,本试验对蛋种禽添加了不同剂量的芽孢杆菌制剂,发现不同添加剂量的芽孢杆菌制剂对蛋种禽的产蛋率、平均蛋重和料蛋比没有显著影响(P0.05),但显著降低了蛋壳厚度(P0.05).     

北京市禽蛋流通模式选择的演化博弈分析

将北京市本地的禽蛋经营者和外地的禽蛋经营者作为两个群体，分析了禽蛋流通模式选择的演化问题。通过建立种群演化动态模型，发现在劳动力密集型与资金技术密集型流通模式的选择博弈中，存在唯一的演化稳定策略，即未来劳动密集型（散装禽蛋）流通模式将退出北京市场；在加工流通模式与包装流通模式的选择博弈中，存在3个演化稳定策略，而现实的演化路径则取决于演化的初始状况。最后指出环境、禽蛋物流技术以及禽蛋加工技术是影响禽蛋流通模式选择演化速度的关键。图1，表2，参10。     

结构稳定的亚克力毛毯开发

介绍了稳定型亚克力毛毯的组织结构.说明了FG-88机器的编织系统,产品的设计方案,机器的改造方法等.比较了新组织与传统组织中毛圈脱落所需外力的大小和延伸性.     

A new species of Glyphidrilus (Microchaetidae: Oligochaeta) from East Africa

Of all of the chrysomelid subfamilies, only the larvae of the Megascelinae, along with those of the Aulacoscelinae remain undescribed. The first instar larva of Megascelis puella Lacordaire from Panama is described, as well as the eggs. Larval characters, eggs and oviposition behaviour are used to relate the Megascelinae with the Eumolpinae in support of what is known to date concerning adult morphology.     

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.     

钢丝绳成形过程共转坐标系弹塑性有限元分析

钢丝绳强度受其几何结构和成形加工应力的影响很大,为此采用考虑钢丝绳成形大转动几何非线性的共转坐标系弹塑性有限元法,模拟了钢丝绳成形过程,通过数值计算分析了成形过程捻制反扭转系数和捻制方向组合对钢丝绳加工应力应变分布的影响,可为钢丝绳成形工艺与结构强度的合理设计提供依据。