LTE-Advanced系统中Relay技术及其性能研究

Relay能够解决由于传输无法铺设、宏站站址物业难以协调、高楼遮挡等原因存在覆盖盲区的问题。本文首先描述了LTE-A Relay系统架构;其次,介绍Relay的分类与回传链路设计;最终,通过系统仿真方法,给出了Relay对于覆盖性能、宏基站吞吐量的提升效果,并给出了回传链路的设计建议。     

基于改进DNN的配电网接地故障选线方法研究

针对配电网单相接地故障特征信息不清晰且现有选线方法易受故障条件和环境噪声的影响,根据配电网暂态故障特征和稳态故障特征,提出了一种改进的深度神经网络用于故障选线。对深度学习网络的损失函数和学习率进行优化,进一步提高选线的效率和准确性。通过仿真验证了该方法的可行性。结果表明,与改进前相比,改进后的训练迭代次数由86次降低到30次,训练效率提高了65.12%,故障判断的准确率由95%提高到99%,具有较好的抗干扰能力,有一定的参考价值。     

关于居住小区商业配套中的“填空”问题思考

本文通过对居住小区商业配套的现状观察,指出目前居住小区商业配套大多采用“填空”的思维和方式来谋篇和实施,导致本应该成为居住小区生活品质保证的商业配套设计被忽视。文章从开发商的态度、商户的问题、政府的要求、消费者的需求的全方位角度分析中提出居住小区商业配套设计应该着眼于规划指标到技术条例的同步以及实施,才是一条切实可行的途径。     

循环冷却水系统浓缩倍数的管理

主要介绍循环水场浓缩倍数管理中存在的问题,通过对存在问题的分析,找出解决问题的办法.同时对提高循环水浓缩倍数所带来的经济效益进行了分析.提出了确保循环水系统浓缩倍数稳定运行的措施.     

Bioethanol production using genetically modified and mutant wheat and barley straws

To improve the performance of wheat and barley straws as feedstocks for ethanol biorefining, the genetic modifications of down regulating Cinnamoyl-CoA reductase and low phytic acid mutation have been introduced into wheat and barley respectively. In this study, total 252 straw samples with different genetic background and location were collected from the field experiment based on a randomized complete block design. The fiber analysis (neutral detergent fiber, acid detergent fiber, and acid detergent lignin) indicated that there were no significant differences between modified and wild type straw lines in terms of straw compositions. However, the difference did exist among straw lines on fiber utilization. 16 straw samples were further selected to conduct diluted acid pretreatment, enzymatic hydrolysis and fermentation. The data indicated that the phytic acid mutant and transgenic straws have changed the fiber structure, which significantly influences their hydrolysibility. These results may lead to a possible solution of mutant or genetic modified plant species that is capable to increase the hydrolysibility of biomass without changing their compositions and sacrificing their agronomy performance.     

剪切带修复对Pd基块体非晶合金腐蚀性能的影响

摘 要：本文以Pd79Cu4Au2Si10P5块体非晶合金为研究对象,采用电化学极化曲线和电化学阻抗测试方法研究了剪切带自修复对其在3 wt.% NaCl溶液和1 mol/L HCl溶液中耐蚀性能的影响。通过研究极化曲线中的自腐蚀电位和自腐蚀电流密度得知,修复后样品耐腐蚀性能优于修复前样品,但仍低于原始样品（即未变形样品）。电化学阻抗研究结果显示,在开路电位下阻抗图均有单一容抗弧构成,修复后样品的电化学转移电阻Rt小于原始样品的、但大于修复前样品的,这进一步表明修复提高了材料的耐腐蚀性能,但仍未达到原始样品的耐蚀性。扫描电镜研究发现,合金表面发生明显的点蚀,其中原始样品的点蚀坑密度最少,修复后样品的次之,修复前样品的最多。     

南水北调中线工程北汝河段串流区淹没解决方案分析

北汝河和石河之间以及石河右岸地势较低,北汝河和石河洪水漫溢出槽;南水北调中线工程总干渠及各河道建筑物修建后缩窄了行洪断面,对河道的行洪产生一定影响,上游水位壅高、淹没时间延长,上游耕地和村庄淹没水深有所增大。结合北汝河串流片特点对淹没影响进行处理,选定了征迁安置、河道防护、河道治理、河道防护与河道治理结合4个处理方案进行研究比选,按照技术可行、经济最优并最大限度的保障受淹没影响村民安居乐业的标准,选定方案三即河道治理方案为最优方案。     

大数据分析与网络弱覆盖发现案例

网络弱覆盖严重影响用户感知,是运营商最为关注并需首要解决的问题之一。网络弱覆盖的发现来源主要有路测、用户投诉等,近年来,随着大数据采集与分析能力的提升,也成为了弱覆盖发现的重要手段之一。本文以某密集城区为例,介绍从基于Hadoop的大数据解析、大数据定位、到网络弱覆盖发现与优化建议的整个流程,给实际网络规划优化工作提供经验。     

应用模糊集合理论与模型构造的决策支持系统

本文介绍一个应用模糊集合理论与模型构造的决策支持系统，着重论述了模糊决策支持系统基本理论，设计和实现方法。     

Mechanism of adhesion of low surface energy materials treated with trialkylborane

Excellent adhesion to low surface energy materials without surface pretreatment was obtained by acrylates polymerization initiated by trialkylborane at room temperature. The adhesion mechanism was elucidated by electron spin resonance (ESR) and gas chromatography-mass spectroscopy (GC-MS) analysis based on model compound and chain transferring agent technologies. On the other hand, polypropylene (as one kind of low energy surface materials) was treated with trialkylborane and its effects were also studied by attenuated total reflection Fourier transform infrared spectroscopy (FTIR-ATR) and Raman spectroscopy, static contact angle measurements. The result provided further supports the elucidated mechanism.The results showed the adhesion resulted from the monomer’s graft on the surface of low surface energy materials. The graft resulted from the hydrogen abstraction reaction of materials (not less than three hydrogen sites) by alkoxyl and other radicals. These radicals came from oxidation of trialkylborane through the cleavage of O−O bond of R₂BOOR. The adhesion was caused neither by the materials’ surface energy improvement nor by the copolymerization of polymerizable monomers and unsaturated groups on the surface of materials.