县域宜居城市规划与建设的思考——以新化县城总体规划为例

现代宜居城市的构筑符合科学发展观的基本要求,是建设和谐社会的具体体现。本文结合笔者多年城市规划设计实践,站在城市发展的高度,分析探讨了县域宜居城市规划建设的基本特点和要求,并以新化县为例,从多方面对县域宜居城市规划设计与建设进行了详细阐述。     

清末民初广州市市政制度的实践与启示

清末民初时期,广州率先确立市制,实现了城乡分治,并通过借鉴美国委员会制以及开展市政革新,初步构建了一整套具有深远影响的近代市政制度,进而引发和推动了一场轰轰烈烈的市政建设,而彼时市政制度演进中复杂和艰巨的历程也成为值得今天借鉴西制的宝贵财富。     

县域村庄空间布局优化的探索和实践——以河北省武安市域村庄空间布局规划为例

以河北省武安市市域村庄空间布局规划为例,分析了地形地貌特点和资源条件对村庄规模、村庄密度、农村经济和村庄空间布局形态的影响,针对不同地貌类型和区位条件,提出不同的村庄迁并标准、布局调整重点和分类指导方案,探讨了丘陵、山地村庄空间布局规划的方法和思路。     

Similarity of coupled heat and mass transfer between air–water and air–liquid desiccant direct-contact systems

Packed-bed heat and mass transfer devices are widely used in air-conditioning systems, such as cooling tower, evaporative cooler of air–water direct-contact devices, dehumidifier and regenerator of air–liquid desiccant direct-contact devices. Similarities of heat and mass transfer characteristics between air–water and air–liquid desiccant devices are considered and investigated in this paper. Same reachable handling region of outlet air can be obtained for both air–water and air–liquid desiccant devices, which is among three boundary lines, isenthalpic line of inlet air, iso-relative humidity line of inlet fluid (water or desiccant), and the connecting line of inlet statuses of air and fluid. Inlet conditions of air and fluid affect heat and mass transfer characteristics to some extent, so that a zonal method is proposed only according to the relative statuses of inlet air to inlet fluid. Four zones, dehumidification zones A, D and regeneration zones B, C, are divided for air-desiccant direct-contact devices. The first three zones A, B and C are divided for air–water direct-contact devices, with the same zonal properties as those of air-desiccant devices. In order to obtain better humidification performance, fluid should be heated (in zone C) rather than air (in zone B). And fluid should be cooled (in zone A) rather than air (in zone D) to obtain better dehumidification performance. Counter-flow pattern should be applied for best mass transfer performance in the same conditions within the recommended zone A or C, while parallel-flow pattern is the best in zone B or D.     

人工湿地处理北方小区生活污水

介绍了沈阳浑南人工湿地示范工程的运行效果,为北方寒冷地区应用湿地技术处理生活污水提供了技术支持与保证.当进水COD为182～423 mg/L、NH3-N为42.0～69.45 mg/L、TP为4.11～8.0 mg/L时,对上述指标的平均去除率分别为90.85%、98.38%、89.68%,出水水质达到国家排放标准.在冬季增加保温措施后,垂直流人工湿地不仅可以安全越冬,利用水流的进入和排出还可有效地与大气进行气体交换,缓解床体内氧气的不足,大大提高对污染物的去除率,达到与其他季节相近的处理效果.     

严寒地区粘贴EPS板外墙外保温薄抹灰面层施工质量控制

针对严寒地区粘EPS板外墙外保温薄抹灰系统应用以来出现的质量问题,提出材料控制、基层控制、粘贴控制、锚栓加设、系统终端控制、面层及滴水线控制、嵌缝胶施工等质量控制措施并提出建议。     

厢式货车在桥塔区域的气动力特征研究

以曼牌16.170F货车及象山港大桥为背景,加工制作了曼牌货车和象山港大桥的1∶25缩尺模型,在TJ-3风洞,使用六分量测力天平对货车模型进行了测力试验,通过试验得到了货车在双向四车道,五个风偏角,相对于桥塔的五个不同位置以及无桥塔状态时的气动力系数。     

Multiple current peaks and spatial characteristics of atmospheric helium dielectric barrier discharges with repetitive unipolar narrow pulse excitation

Atmospheric dielectric barrier discharges driven by repetitive unipolar narrow pulse excitation are investigated numerically by using one-dimensional fluid models.The one-dimensional simulation focuses on the effects of applied voltage amplitude,pulse repetition frequency,gap width and γ coefficient on the multiple-current-pulse (MCP) discharge.The results indicate that the MCP behavior will lead to the stratification of electron density distribution in axial direction.Traditional MCP manipulating methods,such as reducing the applied voltage amplitude,increasing the applied voltage frequency,adjusting the gap width,cannot regulate MCPs exhibiting in this work.Further analyses reveal that the increasing electric field of the cathode fall region is the basis for the emergence of MCP behavior.     

钼镍磷溶液的制备和表征

 以三氧化钼、碱式碳酸镍、磷酸为原料,制备了Mo-Ni-P-O溶液。在Mo-Ni-P-O溶液的制备过程中发现存在1个可配区间和2个难配区间,考察了可配比关系及可配区间内溶液的性质,并初步探讨了各区间的形成原因以及可配区间内不同物料配比的Mo-Ni-P-O溶液形成速率。在Mo-Ni-P-O浸渍液中添加一定量的柠檬酸,采用共浸渍法制备了Mo-Ni-P-O/γ-Al2O3催化剂,考察了催化剂组成对其噻吩的加氢脱硫性能的影响。结果表明,当催化剂中Mo、Ni 、P 含量分别为1.67、0.65、0.32mmol/(g Cat)时, 为24%、NiO含量为4.8%、P含量为1%时,Mo-Ni-P-O/γ-Al2O3催化剂表现出较好的噻吩加氢脱硫活性。     

基于区域生长和背景配准的低信噪比红外目标检测算法

为了进一步提高复杂背景下低信噪比红外运动目标的检测性能,提出了一种基于区域生长和背景配准的低信噪比红外运动目标检测算法。该算法首先利用局部对比度找出几个种子点;然后根据种子点进行区域生长,统计生长出目标的相关特征;接着采用多帧关联的方法,挑选出候选目标;最后采用背景配准的方法,剔除虚假目标,降低虚警概率。采用大量实验数据进行仿真验证,仿真结果表明,相对于传统算法,本文算法对低信噪比红外运动目标具有较高的检测概率,较低的虚警概率。