华中地区水库沉积物重金属抗性基因的赋存特征及影响因素分析

环境中重金属抗性基因（Metal resistance genes,MRGs）的迁移转化作为环境及生态领域的重要研究内容近年来备受关注,但目前环境中重金属是否是MRGs的重要驱动因素则尚不明确.本研究采用宏基因组技术对华中地区水库沉积物MRGs进行了定量,并分析了不同形态重金属在MRGs迁移转化过程中起到的作用.结果表明,trcop （抗Cu基因）及arsM （抗砷基因）是水库环境中的主要MRGs,供水水库之间MRGs分布并无地域性差异.czrA （多抗基因）的潜在宿主菌较为广泛,trcop及arsM很可能位于同一种可移动遗传元件上进行水平转移.重金属总量与MRGs之间并无明显联系,而可交换态及碳酸盐结合态（B1）则是环境中MRGs的重要驱动因素.     

高铁酸盐预处理湖泊水库水的研究进展

从高铁酸钾的性质出发,概述了高铁酸钾及其复合药剂预处理湖泊水库水的影响因素,展望了这一领域的发展情况.     

FLUVIAL GEOMORPHOLOGICAL METHODOLOGY FOR NATURAL STABLE CHANNEL DESIGN1

A fluvial geomorphological methodology for designing natural stable channels is being widely applied for river restoration. It is an analogue procedure, as the W/d ratio and sinuosity from a reference reach are scaled to determine the restoration design. The choice of reference reach is crucial and published criteria specify that it should be stable, correspond to the stream type at the restoration site, have the same valley type, and be from the same hydrophysiographic region. For stable, meandering gravel cobble bed rivers flowing through alluvial flood plains (C3 and C4 stream types), UK regime equations are used to evaluate the procedure. Successful design requires particular combinations of the ratios of bankfull discharge, bed material size and load, valley slope, and bank vegetation category between the reference and restoration sites. These critical ratios, which are confirmed by U.S. field data, provide guidelines for selecting a suitable reference reach for C3‐C4 stream types. They also indicate that the reference reach can be in any valley type or hydrophysiographic region. The geomorphological procedure will apply to all stable stream types, provided the reference reach is correctly identified. Specific guidelines for each stream type await the development of additional regime equations.     

哈尔滨市区雾的特征分析及预报指标研究

利用哈尔滨市1954-2003年天气现象地面观测资料中雾的记录,分析了哈尔滨市区雾发生的年际、月际和日变化规律,总结出了雾发生的气象要素、天气分型和预报指标.     

几个影响室内土动力试验的重要试验参数

室内土动力试验是研究土动力特性的重要方法之一,其结果受到很多试验参数的影响,其中加载频率、应变速率(加载速率)、加载类型和循环次数是4个重要的试验参数,也是目前国内外的研究热点。总结了国内外关于这4个试验参数对土动力特性影响的研究成果,经过比较分析后认为对于应变速率(加载速率)、加载类型以及循环次数对土动力特性的影响,研究者的认识基本一致,但对有关加载频率对土动力特性的影响却尚持不同的观点。     

四川省城市化类型的划分

基于四川省城市化水平较低,而且城市化水平在不同地区表现出一定的差距,选取了10个反映城市化水平的指标,并建立了指标体系,对四川省1个副省级市和17个地级市进行了因子分析.根据因子得分,把四川城市化划分为均衡发展型和不均衡发展型,并提出加快四川省城市化进程的对策,力求为制定适宜的城市化对策和发展战略提供科学依据.     

雅玛里克山植被类型及物种多样性的特征

采用典型样地法对雅玛里克山进行了植被调查，结果表明，该区的植物群落类型有14种；植物种类有223种植物．分属37科147属，植物生活型有9类；短命和类短命植物获得一定发育，旱生类型的植物占绝对优势，一年生植物占有一定比例等。     

论饮食业油烟治理技术的发展及应用

实际应用的饮食业油烟净化设备（以下简称油烟净化设备）中，以静电式、机械过滤式、湿式，以及由上述三种技术组成的复合式产品为主。荷电湿式油烟净化器的开发应用，将具有很强的市场竞争力，未来几年，静电式技术将继续被广泛采用，机械式技术将更多地作为预处理手段与其他技术组合使用，湿法技术因兼有部分除味和去除柴油灶燃烧颗粒的功能等特点将更有针对性地应用于适当的场所。优化组合而成的经济高效的复合式技术在未来市场中将占据主导地位。     

MANGANESE OXIDATION RELATED TO THE RELEASES FROM RESERVOIRS1

ABSTRACT: Stratified reservoir waters frequently contain objectionable quantities of dissolved manganese. The oxidation and removal of dissolved manganese during transport below Normandy Dam, Tennessee, was shown to be much more rapid than expected from chemical oxidation. Oxidation took place in only a day of travel time rather than months or years. Laboratory studies showed that removal was associated with a slime found on rock surfaces below the dam and led to the development of column technology as a possible method of treating natural waters containing manganese. Hydraulic loadings on the columns in the range of 390–780 m³/hr.ha accomplished a 90 percent removal rate of soluble manganese over an influent concentration range of 2 to 15 mg/l.     

PRELIMINARY HYDROLOGIC DESIGN OF SMALL FLOOD DETENTION RESERVOIRS1

ABSTRACT. Flood detention reservoir design is a common problem encountered by engineers and others involved with water resources problems. This paper presents a method by which the volume of flood storage required for a single reservoir or a series of reservoirs may be estimated without using numeric flood-routing techniques. The proposed procedure requires a minimum of computations and is most applicable to preliminary design situations where a high degree of accuracy is not required.