基于多频互控分析的记发器信令生成器的工程设计实现

1号信令是电话接续的重要信令,作为1号信令重要组成部分的记发器信令的生成与检测一般都是由专用芯片实现。由于硬件接口和功能固定,在实际使用中往往受到很大限制,因此用通用芯片来实现这一功能可以大大增加灵活性,兼容性。但在软硬件设计之前,准确分析记发器信令的信号波形特性十分重要,往往会决定最终的设计性能指标。首先分析记发器信令的具体物理特性,其具体实验数据取自于满足1号信令协议标准的相关设备,然后分析记发器信号的多频互控流程,包括编码序号和频率成分的对应关系、信号的具体分类、信号的发送流程等,这对于建立从协议层到物理层的相关机制都是十分有意义的。最后给出工程设计的基本思路,包括从ARM+DSP的架构设计、逻辑层次设计、相互之间的接口关系、配合机制等。     

Numerical simulation on the opto-electro-kinetic patterning for rapid concentration of particles in a microchannel

This paper presents a mathematical model for laser-induced rapid electro-kinetic patterning (REP) to elucidate the mechanism for concentrating particles in a microchannel non-destructively and non-invasively. COMSOL^®(v4.2a) multiphysics software was used to examine the effect of a variety of parameters on the focusing performance of the REP. A mathematical model of the REP was developed based on the AC electrothermal flow (ACET) equations, the dielectrophoresis (DEP) equation, the energy balance equation, the Navier-Stokes equation, and the concentration-distribution equation. The medium was assumed to be a diluted solute, and different electric potentials and laser illumination were applied to the desired place. Gold (Au) electrodes were used at the top and bottom of a microchannel. For model validation, the simulation results were compared with the experimental data. The results revealed the formation of a toroidal microvortex via the ACET effect, which was generated due to laser illumination and joule-heating in the area of interest. In addition, under some conditions, such as the frequency of AC, the DEP velocity, and the particle size, the ACET force enhances and compresses resulting in the concentration of particles. The conditions of the DEP velocity and the ACET velocity are presented in detail with a comparison of the experimental results.     

健美操训练对女性有氧适能、身体形态与心理健康的影响研究

采用实验测试法、文献资料法和数理统计法,对湖南理工学院非体育专业30名女大学生12周健美操训练后进行有氧适能、身体形态等指标的测试,说明健美操对女性改善有氧适能、身体形态与心理健康中的作用。     

P2P网贷平台的收益及风险对投资人的选择影响——以“金银猫”网贷平台为例

互联网金融依托其成本低、效率高、覆盖广和发展快的特点,已然成为当下中国金融行业不可压倒的一个趋势,相应地,P2P网贷、第三方支付、大数据金融等互联网金融理财产品也成为当下投资者炙手可热的投资选择,试以"金银猫"网贷平台为例,采用计量的方法定量分析网贷平台收益和风险以及成交量的相互关系,并由此分析投资人在面临收益和风险时的选择偏好问题,最后对如何降低P2P网贷平台的发展以促进其发展给出相应的建议。     

Behavioral Intention to Adopt Digital Library by the Undergraduates

The purpose of this research is to investigate the factors that affect undergraduates' behavioral intention to use digital library among the private universities in Malaysia. The target respondents are undergraduates from Malaysian private universities. Questionnaires were distributed among 500 undergraduates through either online or face-to-face method. Reliability test, normality test, Pearson Correlation Coefficient analysis, and Multiple Linear Regression (MLR) were carried out for data analysis. Performance expectancy, social influence, facilitating conditions, hedonic motivation, habit, and information quality had a positive and significant association with behavioral intention to adopt a digital library except for effort expectancy. This research successfully reinforced that the inspiration to ameliorate Unified Theory of Acceptance and Use of Technology 2 (UTAUT 2) by synthesis of Information Systems Success Model (ISSM). This proposed framework with a combination of ISSM and UTAUT 2 has enhanced the fitness of UTAUT 2. Universities that have yet to implement digital library can comprehend undergraduates' needs better by considering all the significant factors to develop a digital library. The universities with the digital library may also notice the important features of the existing digital library that should be maintained and upgraded constantly so that they can fulfil undergraduates' requirements.     

超声波传感信号传输信道特性分析与测试

为了提高超声波避障测距系统的作用距离,对超声波信号检测与超声波传输信道、信噪比的关系进行了分析。将超声波传播特性与无线电波传播特性进行了对比研究,采用频谱测量的方法对超声波传输特性、信噪比特性进行了实际测试,并给出了提高避障测距系统作用距离的方法与建议。     

基于服务供应链的“知网”工程运作模式——以广东省清远市数字化社区建设为例

根据社区管理的知识化特征,提出了清远市数字化社区"知网"工程的目标和内容。对服务供应链的结构和运作模式进行了分析,在明确服务供应链的流程运作特点和构成要件的基础上,提出了清远市知网工程的服务供应链体系构架。     

初中科学家校合作的实践和思考

教育的效果取决于学校和家庭教育影响的一致性。如果没有这种一致性,那么学校的教学和教育的过程就会像纸做的房子一样倒塌下来。本文对家长和科学教师合作的现状进行了描述,分析了出现这些合作现状的原因,列举了家长、学校、科学教师相互合作给学生和教师带来的作用,介绍了在新时代背景下本人开展科学课程的家校合作的一些简单做法。     

碳管法燃煤烟气汞浓度取样装置研制

自主研制了包括内置吸附剂和两段式碳吸附管在内的整套新型碳管法烟气汞浓度取样装置,以期实现燃煤烟气中颗粒汞和气相总汞浓度的精确测量．在6 kW 燃煤循环流化床装置上同时采用碳管法与安大略标准法（OHM）进行烟气中汞浓度取样．结果表明,碳管法所得汞平衡率均处于95．47％～104．72％之间．不同工况下碳吸附管第2段穿透率始终低于2％,且与相同工况下 OHM 测试结果的相对偏差在15．96％～17．56％之间,均小于20％．结果表明,所研制的碳吸附管干法烟气汞浓度取样装置符合美国 EPA 质量保证和质量控制（QA／QC）标准,可应用于实际燃煤烟气汞浓度的取样测试．     

高职公共英语大班教学课堂小组互动策略培训研究

公共英语课程是一门教学内容丰富、受众面广、教学成效影响力大的公共基础课程,当课堂学生人数超过80人的大班教学在现阶段高职公共英语课堂教学中成为常态时,教与学的效果均大受影响。因此有必要开展适于公共英语大班课堂教学的互动策略研究。本研究探索在高职公共英语课堂环境下小组互动策略培训对增强小组互动的有效性。