"比较法"在英语教学中的运用

在英语教学过程中,运用适用性很广的比较法进行语言知识教学,将其语音、语法、词汇等的对应关系加以比较,训练学生的英语四会技能,培养学生学习兴趣、文化意识等,可以帮助他们掌握好的学习策略与方法,从而提高他们的英语教学质量和水平。     

湖南省城市社区体育现状及发展对策

本文对湖南省城市社区体育的现状和发展形势进行了综合分析,并结合“全民健身计划钢要”的总目标,提出了通过政府支持、企事业协助、个体参与以及大力开发大众体育市场、培养社区体育指导员等有效途径,以促进湖南省城市社区体育运动的发展。     

难忘的前苏联宣传画

2007年是俄国十月革命胜利90周年。俄国十月革命后的宣传画，从一个侧面反映了前苏联的那段历史。     

电子书PDA模式下采购人员应具备的素质

本文介绍了电子书PDA的含义及其操作流程,分析了电子书PDA模式下采购人员应具备的素质,以期为我国高校图书馆开展电子书PDA提供借鉴。     

基于背景差分法的虚拟手术损伤区入刀点定位

在虚拟手术系统模型中,特别是脑外科手术中,由于背景图像色彩的非规则性和非均匀性,导致对脑部损伤区域的手术入刀切割点的定位不准,影响手术精度和效果。传统方法采用损伤区域差异特征信息提取方法实现入刀点定位,对脑部特征二维灰度图片缺陷边界的定位效果不佳。提出一种基于背景差分法的虚拟手术损伤区入刀点定位算法,构建了虚拟手术的总体结构模型,将背景图像和人体软组织目标图像划分为多个子块,基于直方图选择阈值对差分图像序列进行二值化,得到高斯虚拟人体器官解析模型。设计医学图像分割算法,采用背景差分技术确定手术器械与软组织发生碰撞的激励因子,快速获取碰撞点,实现对虚拟手术入刀点的准确定位。实验结果表明,采用该算法实现虚拟手术系统设计和图像重构,对手术过程中器官损伤区域切割入刀点定位准确,性能优越,视景效果较好,计算时间缩短,精度提高。     

低碳理念下的古镇旅游发展--以青岩古镇为例

青岩古镇在旅游业发展中引入了低碳的理念,在旅游生产中坚持基础设施建设低碳化、交通运输方式低碳化、古镇建设低碳化和提高碳汇能力,在旅游消费中引导游客进行低碳饮食、低碳住宿、低碳出行和低碳旅游购物等,对降低整个景区的碳排放具有良好效果。     

One-heater flow-through polymerase chain reaction device by heat pipes cooling

This study describes a novel microfluidic reactor capable of flow-through polymerase chain reactions (PCR). For one-heater PCR devices in previous studies, comprehensive simulations and experiments for the chip geometry and the heater arrangement were usually needed before the fabrication of the device. In order to improve the flexibility of the one-heater PCR device, two heat pipes with one fan are used to create the requisite temperature regions in our device. With the integration of one heater onto the chip, the high temperature required for the denaturation stage can be generated at the chip center. By arranging the heat pipes on the opposite sides of the chip, the low temperature needed for the annealing stage is easy to regulate. Numerical calculations and thermal measurements have shown that the temperature distribution in the five-temperature-region PCR chip would be suitable for DNA amplification. In order to ensure temperature uniformity at specific reaction regions, the Re of the sample flow is less than 1. When the microchannel width increases and then decreases gradually between the denaturation and annealing regions, the extension region located in the enlarged part of the channel can be observed numerically and experimentally. From the simulations, the residence time at the extension region with the enlarged channel is 4.25 times longer than that without an enlarged channel at a flow rate of 2 μl/min. The treated surfaces of the flow-through microchannel are characterized using the water contact angle, while the effects of the hydrophilicity of the treated polydimethylsiloxane (PDMS) microchannels on PCR efficiency are determined using gel electrophoresis. By increasing the hydrophilicity of the channel surface after immersing the PDMS substrates into Tween 20 (20%) or BSA (1 mg/ml) solutions, efficient amplifications of DNA segments were proved to occur in our chip device. To our knowledge, our group is the first to introduce heat pipes into the cooling module that has been designed for a PCR device. The unique architecture utilized in this flow-through PCR device is well applied to a low-cost PCR system.     

论大学校园文化中的公寓文化建设

公寓文化是校园文化的重要组成部分。目前在校园文化特别是公寓文化建设中存在着一些问题,如学校对公寓文化建设重视不够,公寓文化活动仍处于自发性和盲目性状态,缺乏有效的管理监督机制,内涵相对贫乏,网络文化的消极影响严重等。高校应加强对学生公寓的管理,在提升公寓后勤管理队伍的整体素质的同时,通过加强公寓硬件、精神文明、管理服务等方面的建设,营造一个优秀健康、和谐向上的大学生公寓文化氛围,促进大学生的全面健康发展。     

广州大学校园体育设施调查研究

本文主要对广州大学校园体育设施进行调查研究,并利用ArcGIS软件制作出广州大学校园体育设施分布图.研究得出了广州大学校园体育设施在使用、分布、维护及管理等方面存在的问题.针对问题,提出了合理布局,充分发挥学校场地器材综合功能等建议.