污染物质

With the rapid development of industrial production, chrome has become a main environmental pollutant in the recent years.

近年来，由于工业生产的飞速发展，铬已成为一种主要的环境污染物质。

Based on the basic diffusion theory, the general model of the contaminant transport in the environment is presented.

然后从最基本的扩散理论入手，建立了污染物质在环境介质中传输的通用模型，再结合土壤这一特定的环境介质，对传输模型进一步深化，得出能准确地表达出污染物在各种土壤条件下的运移过程的数学方程，并给出了各种典型情况下的解析解。

In addition, the dispersion of some disinfectant or polluting substances in the water is also analyzed.

此外，一些分散的消毒剂或污染物质的水进行了分析。

Similar as traditional activated sludge system, when the water temperature was below 4℃, sludge bacteria went into dominancy phase and metabolism stopped. All the removal of nitrogen and COD was due to membrane blockage.

与传统活性污泥系统类似，在水温低于4℃的情况下，MBR反应器内的微生物进入休眠状态，无法对水中污染物质进行分解代谢，对于氨氮和COD的去除均由膜组件的物理截留造成。

Using electrostatic precipitation, the ESP Air Purifier traps airborne pollutants*—such as pollen, dust mites, smoke and pet dander—improving the quality of the air in your personal space.

ESP Personal Air Purifier 通过静电沉淀原理吸取空气中的污染物质，比如花粉，灰尘，烟尘和宠物皮屑等等，从而达到改进您私人空间空气质量的效果。

ConclusionThe possible main sources of soil pollution were the trace heavy metals in exhaust fume and tires of automobiles running on the road.

结论公路旁土壤中重金属污染物质可能的主要来源为机动车燃料和轮胎中所含微量重金属成分。

However, if pollutants and/or hygroscopic salts are present, corrosion occurs at much lower humidity levels.

然而，如果存在污染物质和/或吸湿盐，腐蚀也会在低湿度的情况下发生。

The first step of simulation method is to establish the one-dimension parabolic partial differential advection diffusion equation that was used to describe the mass transportation model of air-pollution distribution as a block program model of the controllable plant. Then, applying the Fuzzy logic theory to operate tunnel jet-fans and control the tunnel wind quantity and adjust the wind average velocity would not let the air-pollution concentration over the standard safety value too much.

模拟方式首先将常被用以表示隧道内空气污染物质传理论模式之一维向平流扩散抛物线型偏微分方程式建构成一组可控制对象的方块程式模拟模型，再运用模糊逻辑理论模拟控制喷流式通风机之运转风量来调节隧道内平均风速以控制隧道内空气污染物浓度不至於高过标准安全值太多。

It observed elements of the marine environment are:(1) physical parameters, such as water temperature, salinity, currents, tide, wave and so on;(2) weather station network-related physics parameters, such as sea surface wind, temperature and dew point, pressure, sea ice, wind and waves and swell;(3) other parameters, such as solar radiation and rainfall;(4) non-physical parameters, such as pollution physical, chemical and biological parameters such as volume.

它所观测的海洋环境要素主要有：（1）物理学参量，如海水温度、盐度、海流、潮位、波浪等；（2）与天气站网有关的物理学参量，如海面风、气温及露点、气压、海冰、风浪和涌浪；（3）其他参量，如太阳辐射和降雨量；（4）非物理参量，如污染物质、化学和生物量参量等。

Firstly, it introduces the composing and nature of natural water body, discusses the reasons, major types of water pollution, transfer, transformation and self-purification mechanism of various pollutants and features of water resources, water pollution situation in China .

一是介绍了天然水体的组成和性质，讨论了水污染形成的原因、主要类型、水体中各种污染物质迁移、转化与自净的机制及我国的水资源特点、水污染的状况。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。