作业机废气减排技术研究

柴油发动机尾气排放中含有比汽油发动机更多的颗粒污染物。文章叙述了尾气净化装置反应原理,触媒及化学稳定性,柴油氧化催化剂和颗粒催化过滤器优点。通过外部加装尾气净化装置,解决了尾气污染问题,具有较好的发展前景、较强的实用性和可操作性。     

浅谈高校办公室工作的基本规律与工作技巧

从明晰高校办公室工作职责、高校办公室主任应具备的能力、创新高校办公室管理模式三个方面,阐述了高校办公室工作的基本规律。通过在高校办公室多年的工作积累,总结出了高校办公室主任八方面的工作技巧。     

唐山排污权交易模式浅析

对开展排污权交易的目的、意义、关键因素进行了分析,对唐山排污权交易的工作进程以及交易指标、交易主体、交易程序、指导价格、申购数量、交易范围、优先及限制条件等模式特点进行了阐述,以期为同类型城市开展排污权交易提供参考。     

浸水冷应激对雏鸡某些酶活性及消化道粘膜充血的影响

以海兰雄性雏鸡为试验对象,研究急性浸水冷应激对健康雏鸡某些酶活性消化道粘膜充血的影响。结果表明：雏鸡在浸水冷应激后血清肌酸激酶（CrK）呈一致性升高趋势;而丙氨酸氨基转肽酶（ALT）的活性则在冷应激后15min明显升高（P＞0.05）,而后降低,至120min时又恢复致冷应激前水平,雏鸡血清乳酸脱氢酶（LDH）在冷应激后15－60min呈渐进性升高,而后降低;血清γ－谷氨酰转肽酶（γ－GT）的变化趋势为,在冷应激后15min稍升高,而后则逐渐下降;血清尿素氮（BUN)的变化无是,在冷应激后60min降低,浸水应激后不同时间对海兰雏鸡消化道粘膜充血的结果表明：雏鸡在浸水应激后即刻观察造成消化道充血现象并不严重;而浸水应激后不同时间却对雏鸡消化道产生相对较强的影响,特别是冷应激后1－2h胃肠道充血比较严重。     

采场通风方式与瓦斯运移规律研究

采场是煤矿生产的核心地带,而采场通风系统是确保采场作业安全,创造良好生产环境的重要环节。本文以采场风流流动及瓦斯运移理论为基础,通过现场试验、模型模拟试验及计算机模拟研究等方法,着重研究了中国常用的和有发展前途的走向长壁后退式U型通风方式、U+L型通曲方式、后退式Y型通风方式条件下采场风流流动及瓦斯运移规律。     

TENMILE CREEK: A STUDY OF STREAM RELOCATION1

ABSTRACT: After input from various interested agencies, three miles of creek were relocated to facilitate the construction of Interstate 70 through Tenmile Canyon west of Denver. The 0.5.million dollar project was designed to provide fish habitat of equal value to that present before construction or, if possible, to improve this habitat. Construction techniques were designed to minimize damage to flora and fauna. After the channels were excavated, rock and log fish habitat structures were constructed. Two years after construction, a 4 percent chance flood occurred at the project area which made almost 75 percent of the habitat structures ineffective. Pool-riffle ratios and quantity and quality of spawning areas remained essentially unchanged throughout the period. Population estimates indicated an increase in the number of fish in the postconstruction period compared to preconstruction numbers. Fish biomass estimates for the project area were comparable for the two periods. Aquatic invertebrate populations were unchanged as indicated by comparison of three pre- and postconstruction indices.     

COLD-SHOCK RESISTANCE TO LARGEMOUTH BASS,BLUEGILL, AND CHANNEL CATFISH1

ABSTRACT: Juvenile specimens of largemouth bass, bluegill, and channel catfish were tested to determine their ability to withstand abrupt temperature decreases simulating the environmental impact from a sudden shutdown of a nuclear reactor during the winter. Temperature reductions were administered over 2-hour and 24-hour periods to assess the importance of the rate of temperature change and hence the mitigative value of having a holding pond with a one-day retention time between the proposed cooling tower discharge and the receiving stream. Temperature decreases administered over a 2-hour period resulted in much greater mortality than decreases of the same magnitude administered over a 24-hour period. Thus, the value of a pond for mitigation from cold shock was substantiated. Results also indicated that adherence to the U.S. EPA temperature criteria for freshwater fish should provide adequate protection from cold shock.     

SUBALPINE,COLD CLIMATE,STORMWATER TREATMENT WITH A CONSTRUCTED SURFACE FLOW WETLAND1

The Tahoe City Wetland Treatment System (TCWTS) was constructed in 1997 to treat stormwater runoff from 23 ha of commercial, highway, and residential land use in the Lake Tahoe Basin. This subalpine, constructed, surface flow wetland treatment system consists of two cells in series, with a design water surface area of about 0.6 ha. Water quality monitoring from October 2002 through September 2003 was conducted with autosamplers at the inflow and outflow sites during 24 sampling events, with a median duration of 53 hours, representing 42 percent of total inflow to this wetland during the year. Monitoring data indicate an improvement of 49 percent or greater in effluent concentrations of dissolved phosphorus, nitrate, orthophosphorus, and total suspended solids. On average, event mean concentrations of total phosphorus were reduced from a median 279 μg/l at the inflow to 94 μg/l at the outflow. Event mean concentrations of total nitrogen were reduced from a median 1,599 μg/l at the inflow to 810 μg/l at the outflow. Net nutrient retention for the sampling period was estimated at 3 g phosphorus (P)/m²/y and 13 g nitrogen (N)/m²/y. Almost 4,000 kg of suspended sediment was captured by this wetland system during the year.     

“一一·二四”海难渤海风场的数值模拟

用中尺度数值模式 ＭＭ５对 １９９９年 １１月 ２４日烟台附近发生重大海难事故的渤海风场进行了数值模 拟，探讨了该次冷锋大风的风场特征和影响机制．结果表明：用９０ｋｍ的粗网格可以成功地模拟地面冷高压 与锋面的发展和移动，以及高空环流形势的演变．而通过３０ｋｍ细网格的模拟发现，在冷锋后的行星边界层 中．存在着一条宽度为 ２００ ｋｉｎ的中尺度强风带，最大风速位于 ９２５ｈＰａ，它与高空的极锋急流并不相连；细 网格还模拟出了渤海中尺度低压的发展过程，它使近地面层大风的强度显著加强．模拟还表明，海陆差异对 近地面的风场分布有重要的影响，强风带移入渤海后，在渤海海域形成一个 ２００—３００ ｋｍ的中尺度强风 区．因此，采用具有较高分辨率的中尺度数值模式，对提高渤海大风的预报水平，避兔海难事故的发生更具 有重要意义．     

全面提高成人高校学报质量的思考

针对全国报刊治理整顿后多数学报由内部发行转为正式学报类期刊的新情况,本文从学报业务工作的几个方面对全面提高成人高校学报(以下简称“成高学报”)办刊质量进行了较详细的论述,旨在对成高学报的办刊工作起到一些促进作用。