基于粗波分复用技术的LTE-CRAN光缆网设计

为缓解LTE网络建设压力,转变机房式基站建设模式,CRAN技术正式投入使用。CRAN模式下,BBU集中部署,远端RRU拉远,实现快速建站目标,但同时星型的端到端组网模式对传送网资源需求达到前所未有的高度。为缓解传送网压力,提升纤芯使用效率与组网合理性,引入粗波分复用技术对传送网配线与纤芯应用模式做出革新,最终实现了光缆网网络能力的本质提升,为LTE-CRAN模式的拓展提供了坚实的基础。     

对蒙脱石层电荷的测定

介绍了蒙脱石矿物晶格的层表面积、层电荷的概念；蒙脱石晶层中单价交换阳离子所占据的面积及层电荷的确定方法，并对不同种方法进行了比较。指出了在蒙脱石改性工艺中，研究蒙脱石层电荷的重要性。     

Improving of Micro Porous Layer based on Advanced Carbon Materials for High Temperature Proton Exchange Membrane Fuel Cell Electrodes

This work reports the study of four different carbon materials for their application as carbon material in microporous layers for high temperature proton exchange membrane fuel cells electrodes. The microporous layers were prepared with carbon black (a commercial one, Vulcan XC72), two different carbon nanofibers, CNF, (Ribbon and Platelet structure) and carbon nanospheres, all of them prepared in our lab. The microporous layers were characterized by XRD. The hydrophobicity, electrical conductivity, and permeability to different gases were also evaluated. The stability is an important issue to be overcome in the field of proton exchange membrane fuel cells. Thus, accelerated thermal and electrochemical degradation tests in phosphoric acid media were carried out to evaluate the stability of the different advanced materials tested under the same conditions. From all the performed essays, the carbon nanospheres were the best nano‐carbon materials because of the lower degradation degree shown by the microporous layer prepared with them and the good conductivity and permeability achieved, whereas CNF with a Platelet structure showed a low electrochemical stability due to their greater edge plane exposure which favors their corrosion.     

基于集对分析的空袭作战方案决策模型

基于集对分析理论,提出空袭作战方案的评价模型。通过建立待评估方案决策矩阵,构造理想方案。运用层次分析法确定评价指标权重,形成待评估方案和理想方案联系矩阵。对各项指标值与其相应权重系数线性叠加合成,以同一度大小对备选方案排序选优,为空袭作战方案的选优提供简单、实用的评价方法。     

烷基季铵盐改性膨润土的膨胀性

用X射线衍射(XRD)、傅立叶红外光谱(FT-IR)和热重(TG)表征方法,考察了四甲基溴化铵(TMAB),四乙基溴化铵((Et)4NB),十二烷基三甲基溴化铵(DTAB),十六烷基三甲基溴化铵(CTAB)对膨润土膨胀性的影响。结果表明,不同季铵盐都已吸附到膨润土晶层间,短链季铵盐TMAB和(Et)4NB主要以单分子平躺在膨润土晶层之间,使膨润土的层间距比原土样降低,有很好的防膨作用。长链季铵盐DTAB和CTAB以假三层平卧、倾斜排列等方式排列,使膨润土的层间距比原土样增加,没有防膨作用。且膨润土对(Et)4NB和TMAB的吸附量低于DTAB和CTAB的。     

高速摄影法研究铅芯延期体的燃烧特性

用高速摄影仪对卡在透明塑料管中的铅芯延期体从点火到喷火的过程进行了拍摄.图像显示,在铅芯延期体点火端有一段延期药与点火药头一起在很短的时间内完成燃烧过程;在铅芯延期体喷火端有一段延期药被喷出,铅芯延期体未起延期作用.将燃烧后的铅芯延期体沿药芯切开,显微镜下观察残渣,发现有的残渣呈层状龟裂.根据结果,对这些影响铅芯延期精度的因素进行了分析.     

木瓜蛋白酶在淘汰蛋鸡腌制风干过程中的嫩化研究

以木瓜蛋白酶（papain）嫩化淘汰蛋鸡，并将其腌制、风干制成风鸡，通过测定各工艺点的剪切力（WBS）、肌原纤维小片化指数（MFI）、蒸煮损失、总氮（TN）和非蛋白氮（NPN）含量，研究了木瓜蛋白酶的嫩化效果及腌制、风干对酶嫩化效果的影响。结果表明：浓度为0．001％（W：W）木瓜蛋白酶溶液处理的淘汰蛋鸡制成的风鸡，其风味品质综合质量指标达到设计要求，鸡胸肉的剪切力降低了32％，蛋白质水解指数（P．I．％）提高了10％。     

Development of a method employing reversed‐phase thin‐layer chromatography for establishing milk fat purity with respect to adulteration with vegetable oils

A systematic study was conducted using reversed‐phase thin‐layer chromatography wherein unsaponifiable matter of samples namely, pure cow and buffalo milk fats, vegetable oils (groundnut oil, soya bean oil and sunflower oil) and milk fats adulterated with vegetable oils (≥1%) were run along with the reference standards using two new solvent systems to detect adulteration in milk fat. The results of the study revealed that adulteration at even a 1% level could easily be detected using this rapid, reliable and reproducible method based on the presence of β‐sitosterol as a marker and some additional spots ascribable to their occurrence in vegetable oils only.     

AutoCAD二次开发中图层的应用研究

图层的运用为CAD存放数据节省了大量的存储空间.在用Visual Basic二次开发AutocAD时,必须使用图层.图层及图层上的实体对象用Add方法创建并引用后才能编辑和使用.     

焊缝层数对不锈钢复合板残余应力和变形的影响

利用有限元法开发顺次耦合的弹塑性焊接残余应力有限元分析程序,对304不锈钢复合板补焊残余应力进行分析;在试验验证的基础上,讨论焊缝层数对残余应力的影响。计算结果表明,最大焊接残余应力出现在热影响区。由于覆材和基材强度的不匹配,在基材和覆材的界面产生了不连续的应力分布,对开裂影响很大。随着焊缝层数增加,变形增加,导致部分残余应力释放,使得残余应力降低。