低蛋白和高蛋白饲料对大鼠骨代谢的影响

应用骨组织形态计量学的方法观察并比较低蛋白和高蛋白饲料对大鼠骨骼的影响。将 3月龄雄性Sprague Dawley大鼠 18只随机分成 3组 :对照组control(Pr2 0 % )、低蛋白组LPD(Pr8% )、高蛋白组HPD(Pr2 3% )。饲喂按AOAC方法合成的提纯饲料 90d后 ,取左侧胫骨近心端不脱钙骨包埋后 ,进行骨组织形态计量学分析。测得结果为 :与对照组相比 ,LPD骨小梁面积百分率 (%Tb .Ar)减少 5 7% (P <0 .0 1) ,骨量明显减少 ,骨小梁间距 (Tb .Sp)增大185 % (P <0 .0 5 ) ,反映骨形成的指标骨形成率 (BFR TV)明显降低 (P <0 .0 5 ) ,荧光周长百分数 (%L .Pm)、矿化沉积率 (MAR)有降低的趋势 ;HPD亦使大鼠 %Tb .Ar减少 40 % (P <0 .0 5 ) ,呈骨低转化的趋势 ;LPD与HPD相比 ,各项指标都有所增强。由上可知高蛋白和低蛋白饲料都使大鼠骨量明显减少 ,骨结构变差 ,骨强度下降。其中低蛋白饲料对骨形成抑制大于高蛋白饲料。     

任意随机变量序列的大数定律

设｛Xn,n≥0｝是任意实值随机变量序列,并且尾概率是一致有界于随机变量X0,通过构造适当的鞅,利用鞅收敛定理讨论随机变量序列｛X,n≥0｝的强极限定理和强弱大数定律,得到了大数定律成立的充分条件,推广了费勒在1946年给出的平均值无限时的大数定律。     

New secondary batteries and their key materials based on the concept of multi-electron reaction

Facing the significant applications in energy field, this paper introduces how to construct new high specific energy secondary batteries based on the concept multi-electron reaction and by designing multi-electron electrode materials. Recent progress on those new secondary batteries and their key materials based on the theory of multi-electron reaction are overviewed. Representative multi-electronic electrode materials, such as metal borides, metal fluorides, sulfur composite electrode materials and ferrates are briefly introduced, as well as the new secondary battery systems constructed with these materials. Thus gives the significance of the development based on multi- electron reaction mechanism of secondary batteries and their key materials for new chemical battery systems and related energy materials.     

吲哚美辛对菊花和地瓜插枝生根的影响

吲哚美辛能显著促进菊花、地瓜插枝生根,增加根数和根干重,其适宜浓度分别为3.O×10~(-4)和5.0×10~(-4)mol·L~(-1).     

Ultrafastly activated needle coke as electrode material for supercapacitors

The uniform porous structure makes activated porous carbons(APCs) superior electrode material.Traditionally,APCs are produced by a combination of time-consuming high-temperature heat treatment and activation,with a production time of up to several hours.The produced APCs have relatively low specific surface area(SSA) and porosity.Therefore,the electrochemical performance is poor,which limits its application in high-power energy storage devices.Here,APCs materials are directly synthesized by a hi...     

Effect of thermo-mechanical treatment on Ti–Ta-Hf high temperature shape memory alloy

The microstructure, martensitic transformation and mechanical/functional properties of Ti–Ta-Hf alloys with various thermo-mechanical treatments were investigated. The results reveal that the hot-rolling could refine the grain size and introduce a certain number of defects, resulting in the disappearance of martensitic transformation. The as-casted and solution treated Ti–Ta-Hf alloys were composed of α'' martensite phase and smaller volume of β phase. In contrast, the grain size of solution treated Ti–Ta-Hf alloy was slightly less than that of as-casted Ti–Ta-Hf alloy. This should be responsible to the higher yield stress and superior strain recovery characteristics for solution treated Ti–Ta-Hf alloy. The yield stress for the dislocation slip and the maximum recoverable strain of solution treated Ti–Ta-Hf alloy were 723 ​MPa and 5.06%, respectively.     

严重非均质油藏高含水期剩余油分布研究进展

目前，我国东部大多数油田在经过长期注水开发后己进入高－特高含水采油阶段，但油藏内仍然有约５０％的可采储量，它们的分布日趋分散、复杂，开采难度越来越大，其中一个最主要的原因是油藏（或储层）的严重非均质性，文章对国内外剩余油分布状况进行了详细分析。针对我国东部老油田的开发现状，从开发地质的角度出发，详细论述了严重非均质油藏剩余油分布及其动态预测的研究内容和方法，并指出了相应的研究思路和技术关键。重建适合开发后期的具有预测功能的储层地质模型，对稳定东部，改善油田开发效果，提高油田最终采收率具有重大的意义。     

两点边值问题的一种高精度差分方法

基于经典中心差分公式，诉诸差分余项反向修正，本文提出了一种求解两点边值问题的高精度差分方法。该方法仅涉及相邻网格点，具有四阶段精度。数值算例表明，本文格式较以往的格式具有更高的精度。     

关于高校新校区后勤服务保障系统研究

新校区远离城市商业中心,加之校区周边社区服务落后。因此,分析新校区后勤保障任务的类别和要求,研究新校区后勤资源配置的优化途径,科学利用校内后勤生产资源、有效选择校外后勤生产资源,探索后勤服务的新措施、新方法,构画新校区后勤服务保障的最佳路径。     

基于TS201的信号处理分系统设计

针对现代信号处理的数据量大和实时性高的特点,要采用高速数字信号处理器及其他高速逻辑器件配合进行处理,硬件平台以6片TS201和一片FPGA为核心,通过连路口,广播方式等实现点对点的通信,实现了可在多种模式下运行的高速信号处理电路。