Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究母猪饲粮中硒源和维生素E水平对初生仔猪和断奶仔猪器官指数和血清激素水平的影响。试验采用2×2因子设计，设2个硒源[亚硒酸钠（SS）和酵母硒（SY）]，添加水平均为0.30 mg/kg（以硒计），设2个维生素E添加水平（30和90 IU/kg）。选用296头3~8胎次的“长×大”经产母猪，按胎次和体况均衡分配的原则随机分为4组，分别为0.30 mg/kg SS+30 IU/kg维生素E组、0.30 mg/kg SS+90 IU/kg维生素E组、0.30 mg/kg SY+30 IU/kg维生素E组和0.30 mg/kg SY+30 IU/kg维生素E组，每组74个重复，每个重复1头猪。试验期为母猪配种第1天至仔猪21日龄断奶。分别在母猪分娩和断奶当天，各组以窝为单位选取8头仔猪（每窝1头，体重接近窝平均个体重，且4公4母），称重后采血并制备血清，检测血清胰岛素（Ins）、胰高血糖素（Glu）、三碘甲状腺原氨酸（T3）、四碘甲状腺原氨酸（T4）和胰岛素样生长因子–1（IGF-1）水平。采血后立即屠宰仔猪，分离心脏、肝脏、脾脏、肾脏、胰腺、胸腺和甲状腺等器官并称重。结果表明：1）与添加SS相比，母猪饲粮添加SY对初生仔猪器官指数均无显著影响（P>0.05），但显著提高断奶仔猪甲状腺指数（P0.05）。3）初生仔猪胸腺指数和断奶仔猪血清T4水品受母猪饲粮中硒源和维生素E水平的交互作用影响（P<0.05）。由此可知，在母猪妊娠期和哺乳期饲粮中添加不同硒源和维生素E水品会影响到初生仔猪和断奶仔猪内脏器官的发育，并且添加SY比添加SS可提高初生仔猪血清IGF-1、Ins和T3水平；此外，SY和VE可通过互作效应促进断奶仔猪血清中T4向T3转化。
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2018-01-05 Cooperative journals: 《工程热物理学报》
Abstract：相变蓄冷材料具有较高的储能密度，在能源高效利用和节能等方面有着广阔的应用前景。本文对固液相变点在20 ℃以下的相变蓄冷材料进行了分类，并详细地总结了目前研究较多的和已经商用的各类相变材料及其热物性参数，比较了不同种类相变材料的热物性和化学性质。最后，本文对相变蓄冷材料的研究和应用前景进行了展望。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract： The thermal deviation of a novel heat transfer surface is calculated and analyzed in a waste heat recovery boiler of a cement plant, where the heat transfer surface is used as the super heater. Uneven thermal load distribution is the main factor giving rise to thermal deviation. Equivalent coefficient of heat absorption deviation is proposed, and a mathematical method is given for calculating the thermal deviation coefficient when the tube bank has an angle with the gas flow. The results are compared with the experimental data, and a good agreement is achieved. It is proved that the special tube arrangement can efficiently utilize the thermal energy, with a low thermal deviation compared with the aligned tube arrangement. Coefficient of heat absorption deviation lies between 0.82 and 1.07, showing very good thermal uniformity as well as structural advantage.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract： Due to high energy density, phase change materials for cold storage have a great potential for improving the efficiency of energy utilization and saving energy. This paper defined the categories of the phase change materials with the solid-liquid phase change points below 20 ℃, which are widely used for cold storage, and reviewed their thermophysical properties. In addition, the paper further compared different categories of phase change materials regarding their thermophysical and chemical properties. Finally, the paper discussed about the research and application of phase change materials for cold storage in the future.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-05-24 Cooperative journals: 《工程热物理学报》
Abstract：本文以闪蒸蒸发机理的特殊性为出发点，基于过热液滴闪蒸所需热量由其内部过热能量提供这一理论基础，建立了全新的过热水滴闪蒸的现象学模型，使用MATLAB/Simulink进行求解，通过实验验证其有效性。经计算得出了闪蒸过程中液滴温度、直径、质量、蒸发速率和蒸发率的变化规律，并利用控制变量法，研究初始温度、闪蒸压力和液滴粒径对液滴温度变化、蒸发速率、蒸发率和闪蒸时间的影响，得出了具有代表性的结论。
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