复合维生素添加剂对高温期淮北麻鸡生产性能和免疫功能的影响

目的:研究饲粮中添加不同水平的复合维生素添加剂对淮北麻鸡生产性能和免疫功能的影响及其相关性。方法:选取480只28周龄淮北麻鸡,随机分为4组,每组3个重复,每个重复40只鸡,饲喂在基础日粮分别添加复合维生素添加剂0(Ⅰ组,对照组)、100 mg/kg(Ⅱ组)、500 mg/kg(Ⅲ组)、1000 mg/kg(Ⅳ组),预试期2周,正试期8周。结果:与对照组比较,1)Ⅲ、Ⅳ组产蛋率比显著提高(P0.05),料蛋比显著降低(P0.05),蛋的受精率、孵化率及出雏率显著提高(P0.05);而Ⅱ组产蛋率、料蛋比、蛋孵化率和出雏率的变化不显著(P0.05);2)Ⅲ、Ⅳ组中血清免疫球蛋白A(Ig A)、免疫球蛋白M(Ig M)和补体C4含量显著提高(P0.05);而Ⅱ组中以上指标含量变化不显著(P0.05);3)Ⅲ、Ⅳ组血清超氧化物歧化酶活性和血清谷胱甘肽过氧化物酶活性及总抗氧化能力明显提高(P0.05),而Ⅱ组变化不明显(P0.05)。结论:饲粮中添加500~1000 mg/kg复合维生素添加剂能提高热应激条件下淮北麻鸡的生产性能、抗氧化能力和免疫功能。     

高斯模式在煤台煤粉尘排放强度测算中的应用

高斯模式是高架孤立点源的经典计算模式,经修正可应用于煤粉尘排放强度的测算中     

非对称变分不等式的另一类非精确交替方向法

对一类非对称变分不等式问题提出了另一类非精确交替方向法，对其中一个子问题(线性变分不等式)的计算仅需要达到一个相对的精度，我们研究了迭代序列的若干性质，并证明了算法的收敛性。     

Analytical solution for functionally graded anisotropic cantilever beam under thermal and uniformly distributed load

The bending problem of a functionally graded anisotropic cantilever beam subjected to thermal and uniformly dis-tributed load is investigated,with material parameters being arbitrary functions of the thickness coordinate. The heat conduction problem is treated as a 1D problem through the thickness. Based on the elementary formulations for plane stress problem,the stress function is assumed to be in the form of polynomial of the longitudinal coordinate variable,from which the stresses can be derived. The stress function is then determined completely with the compatibility equation and boundary conditions. A practical example is presented to show the application of the method.     

Counterformal contacts of full toroidal continuously variable transmission

1 Introduction A traction drive is a device, which transmits powerby means of traction contacts among multiple rotatingbodies. Variable ratio power transmission is achievedby varying the system geometry so that the points ofaction of the traction force are varied. When this isdone in a continuous manner, it results in a conti-nuously variable traction drive varaitor. There areprimarily two types of traction drives that are ofinterest in the automotive area, viz., half toroidaltraction drive an…     

我国幼儿园教师权益保障状况及对其职业压力的影响——基于全国18个城市的调查

权益保障对幼儿园教师队伍建设至关重要,也是影响教师职业压力的重要因素之一。采用问卷调查法,对全国东、中、西部11个省份18个城市的16253名幼儿园教师的待遇权益和专业权益保障状况及对其职业压力的影响进行考察。结果发现:幼儿园教师"五险一金"仍缺乏保障,同工同酬尚未实现;国家级培训机会依然不足,职称评聘难度大;幼儿园教师权益保障在城乡、办园体制、编制类型、教师学历上存在显著差异;幼儿园教师权益保障与其职业压力呈显著负相关,且能负向预测职业压力。因此,应关心不同教师群体的需求,保障幼儿园教师应有的合法权益;加快落实幼儿园教师的待遇权益和专业权益保障,缓解教师职业压力。     

Verifying the operation of an elastic crossbar system applied to a panel painting: the Deposition from the Cross by an anonymous artist from Abruzzo,sixteenth century

This study deals with the post-treatment evaluation of the elastic crossbar system already designed and installed on the recently restored panel painting Deposition from the Cross by an anonymous artist from Abruzzo (sixteenth century). After the restoration, the panel and the crossbars were subjected to mechanical tests to identify their elastic characteristics. Then the panel, equipped with the elastic crossbar system, was subjected for about two months to controlled environmental cycles made up of approximately constant humidity periods. During the two months, the forces exerted by the springs and the deformations of both panel and crossbars were continuously monitored. A mathematical model, calibrated on the specific parameters derived from the analysis of the panel, provided the deformation that the panel would have shown without the crossbars; comparing the model output with the measured data provided a restraining effect (RE) of approximately 7% (RE could range between zero – no restraint – and 100% – total restraint). Future developments of this project will define appropriate procedures to design an elastic crossbar system for a given panel, once the expert judgement of restorers has identified the most desirable RE to be achieved.     

粉体贮存的闭塞及解决措施

通过粉体在上为圆筒、下为圆锥形料仓中的应力分析 ,得出了不发生闭塞的最小卸料口尺寸 ,结合实际情况提出了解决粉体闭塞的措施     

两种构件正应力近似解与精确解相对误差的计算

文献［１］［２］对平面曲杆和圆柱形容器两种构件，正应力有近似解与精确解；近似解工作量远小于精确解．为工作需要，本文计算了两种解相对误差．     

大学生压力及心理健康与应对策略的相关性探析

大学生存在的压力及心理健康问题已倍受社会关注，从对上海6所大学在读大学生进行问卷调查中发现，大学生的压力与心理健康之间存在着显著的负相关关系，而运用恰当的应对方式能有效地缓解压力对心理健康的影响。同时发现，因不同年级不同性别及是否独生子女等差别，大学生所受压力的水平和采用的应对策略及对健康状况的作用有着较大差异。对此，就高校学生教育工作提出了一些建议。