碳化硅添加剂对紫色页岩陶粒烧胀性的影响

利用碳化硅为膨胀成份,紫色页岩为主要原料制作陶粒,研究碳化硅掺加量和焙烧温度对紫色页岩烧胀性的影响,探讨碳化硅引起紫色页岩陶粒膨胀的机理。试验结果表明外加碳化硅0.3wt%可使紫色页岩在1 120℃时膨胀;当碳化硅掺加量提高时,紫色页岩起始烧胀温度下降,添加量为1.2wt%时,起始烧胀温度为1 100℃。     

延边大学朝鲜族女大学生身体成分与身体形态现状分析

对延边大学朝鲜族和其他民族女大学生的身体形态（身高、体重、三围）和身体成分（体重指数、体脂率、腰臀比）进行了比较研究.结果表明：朝鲜族女生的超重和高于正常体脂检出率略高于其他民族,而汉族女生的体重偏低比例略高于朝鲜族和其他少数民族,但均无显著性差异;朝鲜族女生的向心性肥胖比例略高于其他民族,但均无显著性差异;汉族女生的未达腰臀比切点比例高于朝鲜族,具有显著性差异;汉族和其他少数民族女生的身高、体重、臀围均值明显高于朝鲜族,具有显著性差异,但朝鲜族女生的腰臀比均值明显高于汉族,具有显著性差异;朝鲜族女生的体重指数（BMI）和体脂率均值虽然略高于其他民族,但无显著性差异;朝鲜族女生的平均身高略低于全国同龄组女生均值,且超重和肥胖检出率均低于全国同龄组女生检出率.     

未拆/已拆电子元器件的废旧印刷线路板浸铜规律对比研究

以未拆和已拆电子元器件的废旧印刷线路板（Waste Printed Circuit Boards,WPCBs）为研究对象,对比研究了其在硝酸中金属铜的浸出规律。研究结果表明：两者铜的浸出率随粒径的增大、时间的延长和固液比的减小而增大,温度对两者的影响都不大。已拆电子元器件的WPCBs的铜浸出率随H2O2和HNO3用量的增大而增大,而后者在实验讨论的范围内,H2O2和HNO3用量对其浸出率无明显影响。对于1 g样品,当未拆电子元器件的WPCBs粒径为0.25～0.5 mm,固液比为1：1,H2O2和HNO3均为2 mL时,50℃浸出2 h,即可浸出几乎全部的铜;当已拆电子元器件的WPCBs粒径为0.1～0.25 mm,固液比为1：1,H2O2和HNO3用量分别为2 mL和6 mL时,室温浸出2 h,铜浸出率达92.03%。     

碱添加量对金属离子的分布和pH变化的影响

提出了一种计算公式,定量地计算了既有氢氧化物沉淀又有氢氧配离子形成的化学反应体系中的金属离子的分布,考察了影响沉淀和配离子形成的各种因素.基于提出的公式,计算了锌、镉、铜、镍、铁（Ⅲ）、铁（Ⅱ）、铝、钙、镁的沉淀率,理论计算与实验结果一致.     

Downlink call admission control with power allocation and rate scheduling for IDMAbased multibeam satellite systems

Considering the advantage of interleave-division multiple-access (IDMA) technique and the technical bottlenecks in the existing satellite systems,IDMA is introduced into satellite communication network...     

Energy saving effect of building envelope in summer

To explore the energy saving effect of building envelope, the experiments were carried out through a comparison of basic cubicle in summer. Experiments show that if energy efficiency measures are applied only in the external walls and windows, the energy saving cubicles have an average energy efficiency ratio of 27.75% and 27.05% when the air change rates are 1.1 and 1.4 h⁻¹ in summer, with both values being over the standard target value by 25%. And the indoor air temperature of the energy saving cubicle is below that of the basic cubicle. The daily mean temperature difference between the interior surface of insulation wall and no insulation reaches 1.47 °C, and the mean temperature difference is up to 8.52 °C between the interior surface and exterior surface of insulating glass and single glass. The two cubicles were simulated for energy consumption using VisualDOE4.0 software under real weather conditions in summer. The results show that the mean deviation is 10.02% between experimental and simulated energy efficiency ratio. The correctness and validity of simulation results of the VisualDOE4.0 software are proved.     

Stretch rate and deformation for pre-stretching aluminum alloy sheet

Numerical simulation combined with experimental test was carried out to analyze the pre-stretching process of the 7075 aluminum alloy sheet, from which the stress variation curves and residual stress of aluminum alloy sheet in different stretch rates were obtained. The results show that the residual stress in length direction is released after unloading the stretch force, while the residual stress in width direction is released during the stretching process. The study of residual stress elimination is beneficial for optimizing stretch rate on the basis of residual stress distribution law. By comparing the variation principle of residual stress in length direction, the size range of three deformation areas and elimination percentage of residual stress were obtained. The residual stresses of clamping area and transition area are not eliminated effectively, so sawing quantity should be the sum of both the areas. The elimination rate of residual stress in even deformation area could reach 90% after choosing a proper stretch rate, which is verified by both simulation and experiment.     

基于颗粒流的矽卡岩静态加载速率效应研究

采用颗粒流离散元软件PFC2D,通过Fish语言编写程序,模拟了矽卡岩岩样3级不同加载速率下的室内单轴压缩试验,并分析了其静态加载速率效应。模拟结果表明:模拟得到的岩样破裂形态、应力-应变曲线、峰值强度变化等与试验结果较为吻合;加载速率增大,峰值强度及其对应的应变增大,且在10-2数量级内增幅明显,峰后变形能力减弱,弹性模量、泊松比基本不变;加载速率增大,临界扩容应力和扩容点对应应变增大,扩容曲线软化段都很平缓,体积膨胀急剧;岩样主要破坏形态为剪切破坏,且随着加载速率增加,由单一剪切破裂过渡到共轭剪切破裂,更易形成锥形破坏。研究结果可为相关岩体的室内试验及岩土工程的稳定性评价提供参考。     

煤样粒径对煤低温氧化影响的实验研究

基于测试耗氧速率和氧化动力学参数研究煤样粒径对煤低温氧化的影响。利用煤低温氧化测试系统,测算在供应气体流量、氧含量等给定条件下四类不同粒径范围煤样升温氧化耗氧速率,同时依据基于耗氧量建立的数学模型来测算煤低温氧化时不同粒径煤样活化能和指前因子等动力学参数,结果表明不同粒径煤样低温氧化耗氧速率变化分为缓慢耗氧、浅度耗氧和深度耗氧等三个阶段,在实验条件下煤样粒径小于0．198mm的煤样更适合煤低温氧化。     

纯电动轿车制动能量回收节能潜力仿真分析

从整车能量消耗入手,分析纯电动轿车能量流机理,建立整车耗电量与工况、整车参数、部件效率以及制动能量回收比例之间的函数关系,通过求解基于工况的特征权值,研究不同车型在各工况中的节能潜力,为纯电动轿车整车参数匹配提供理论依据。通过分析制动力分配策略,量化制动能量回收比例,进一步计算整车节能度,研究制动能量回收效果。通过在Matlab/Simulink中构建仿真模型,完成整车节能度的计算,并与AVL/Cruise仿真结果进行对比分析,结果表明本文方法能够很好地反映整车节能效果,完全满足整车节能潜力分析的要求。