基于光漫反射的真空皮带脱水机滤布纠偏原理

介绍了湿法脱硫系统中真空皮带脱水机滤布的一种光漫反射纠偏装置,包括其主要部件如光漫反射传感器、电动推杆驱动装置、滤布控制滚轮等,重点阐述了光漫反射纠偏装置的工作原理及纠偏过程。光漫反射纠偏装置的主要原理是通过光漫反射传感器的输出信号来判断滤布的跑偏,根据光漫反射传感器的输出信号,DCS控制系统发送指令启动可伸缩的电动推杆装置来伸长和收缩推杆,从而控制滤布滚轮围绕着旋转点进行相应的倾斜调整,使滤布回到其中心位置。     

基于光环境指数综合评价法的综掘工作面照明环境评价

人通过视觉从外界获得信息的效率和质量与照明环境条件有直接关系,而且人维持基本的视觉功能也依赖于照明,因此照明条件是作业环境中的一个重要方面。为了分析光环境中影响人的工作效率与心理舒适度的因素的各种可能状态与光环境质量的关系,参照建筑行业的光环境指数综合评价法对煤矿井下综掘工作面照明环境进行了评价,从而确立了两个工作面照明环境的质量等级,并据此提出了改善井下照明环境的措施。该研究可对煤矿井下其他作业地点的光照环境评价与分析提供借鉴。     

Z-scheme V2O5-Ag2O/g-C3N4异质结制备及其可见光催化性能

采用原位生长法制备V₂O₅,并将其与Ag₂O/g-C₃N₄水热复合制备V₂O₅-Ag₂O/g-C₃N₄复合光催化剂.利用XRD、FT-IR、SEM和UV-Vis DRS等方法对样品的形貌结构及光学性质进行表征.结果表明,V₂O₅成功掺杂在Ag₂O/g-C₃N₄上,与Ag₂O/g-C₃N₄相比,复合材料对可见光的吸收范围增大;在可见光照射180min后,V₂O₅掺杂量为15%的复合材料对亚甲基蓝(MB)的降解率达到99.10%.经过3次循环降解后,复合材料对MB的降解率保持85%以上,表明其具有良好的稳定性.通过掩蔽实验推测,空穴(h⁺)是光催化体系中主要的活性物质,其光催化性能增强的机理是Ag₂O与g-C₃N₄复合界面形成p-n异质结,并与V₂O₅之间的复合过程符合Z-scheme可见光驱动机制,有效阻碍了光生电子-空穴对的复合,促进活性物质的产生.     

Aerosol scattering coefficients and major chemical compositions of fine particles observed at a rural site in the central Pearl River Delta, South China

During November-December 2010 aerosol scattering coefficients were monitored using a single-waved (525 nm) Nephelometer at a regional monitoring station in the central Pearl River Delta region and 24-hr fine particle (PM_2.5) samples were also collected during the period using quartz filters for the analysis of major chemical components including organic carbon (OC), elemental carbon (EC), sulfate, nitrate and ammonium. In average, these five components accounted for about 85% of PM_2.5 mass and contributed 42% (OC), 19% (SO₄^2-), 12% (NO₃^-), 8.4% (NH₄⁺) and 3.7% (EC), to PM_2.5 mass. A relatively higher mass scattering efficiency of 5.3 m²/g was obtained for fine particles based on the linear regression between scattering coefficients and PM_2.5 mass concentrations. Chemical extinction budget based on IMPROVE approach revealed that ammonium sulfate, particulate organic matter, ammonium nitrate and EC in average contributed about 32%, 28%, 20% and 6% to the light extinction coefficients, respectively.     

基于水下光场结构的巢湖初级生产力评价

根据2009年6月巢湖32个样点的实测数据以及归一化PAR强度数据,探讨巢湖水体的水下光场结构,并计算该水域的真光层深度,在此基础上结合叶绿素a浓度评价其初级生产力.结果表明,巢湖水体水下光强随着深度的增加呈现出指数衰减趋势,水深1 m处光强只有表层光强的0.07%～15.17%;且不同水深处的光场分布总体呈现出西部湖...     

O(1D)与CF3Cl的反应研究

研究ＣＦ₃Ｃｌ－Ｏ₃体系在２５３．７ｎｍ 紫外光照射下所引发的Ｏ（¹Ｄ）与ＣＦ₃Ｃｌ的反应．Ｏ（¹Ｄ）与ＣＦ₃Ｃｌ的反应最终产物为ＣＦ₂Ｏ、Ｆ₂、Ｃｌ₂,并讨论了Ｏ（¹Ｄ）与ＣＦ₃Ｃｌ的反应机理．研究表明,在本实验条件的２５３．７ｎｍ 紫外光作用下,ＣＦ₃Ｃｌ自身不发生解离,同时Ｏ（³Ｐ）不与ＣＦ₃Ｃｌ发生反应．此外外加气体（氮气、氧气）对Ｏ（¹Ｄ）与ＣＦ₃Ｃｌ的反应有较强的淬灭作用     

Comparing Contaminant Removal Costs for Aquifer Recharge with Wastewater with Water Supply Benefits

The use of waters of impaired quality has been suggested as a means to expand available water resources supply for water‐limited communities. An ongoing concern is the safety of supplies that use wastewater because of the potential for introduction of emerging contaminants such as pharmaceuticals into drinking water supplies. Prior research into contaminants of emerging concerns (CECs) have included a variety of methods, but the only consistent removal is with reverse osmosis (RO) membranes, ultraviolet light (UV), and advanced oxidation processes (AOP). However, few of these prior studies have measurable quantities of these contaminants in the influent wastewater, so determining actual removal percentages is difficult. This project was designed to evaluate the removal of CECs to verify that a 3‐log removal of common constituents was realized. Spike testing was used to compare to prior research and to evaluate whether the project costs were competitive with other forms of reuse or other water supplies. The combination of RO/UV/AOP was effective at obtaining a 3‐log removal of CECs, but the RO and UV/AOP processes alone were not capable of removing all substances. However, despite the extensive treatment, the proposed process was both competitive cost‐wise and met the water quality goals.     

不同林木种群对紫茎泽兰营养生长和生殖生长的影响

外来植物紫茎泽兰（Eupatorlum adenophorum）入侵我国西南地区并造成了严重的生态灾难,通过研究不同林木种群下紫茎泽兰的生长特性和发生规律,有助于从生态学角度为紫茎泽兰的综合防控提供事实依据。我们分别于2009、2011和2012年在西昌袁家山上开展了不同人工林木群落下紫茎泽兰营养生长和生殖生长特性的调查。调查研究的结果表明,阔叶林（青冈林）、阔叶针叶混交林（油茶柏树混交林）和阔叶混交林（油茶青冈混交林）下光照强度显著低于两种针叶林（落叶松林和柏树林）和空旷地,光照强度较空旷地减少率均在90％以上。空旷地紫茎泽兰的发生密度可达到111-218株·m-2,两种针叶林（落叶松林和柏树林）对紫茎泽兰的发生表现出一定的抑制作用,抑制率能达到46．2％～77．1％。油茶柏树混交林和青冈林下紫茎泽兰只有零星发生,对紫茎泽兰发生抑制率3年均在90％以上,而在油茶青冈混交林下未发现有紫茎泽兰发生。空旷地紫茎泽兰株高和分枝数均要显著高于其他人工林木群落,单株株高可达160．5～180．3cm,单株分枝数达到14．9～17．4,其中两种针叶林下紫茎泽兰的株高和分枝数要显著高于两种混交林和青冈林,株高达到59．5～113．4cm,单株分枝数为6．4～14．8。此外种植人工林木也显著抑制了紫茎泽兰的开花结实,空旷地紫茎泽兰单株种子量能达到8314～15410粒,两种针叶林（落叶松林和柏树林）下紫茎泽兰单株种子发生量为1330-4666-3粒,而两种混交林和青冈林下紫茎泽兰只有零星开花或不开花结实。相关性分析结果显示,光照强度的大小与紫茎泽兰的发生密度、株高、分枝数、单株花苞数、单株种子数都呈显著正相关,即光照强度显著影响着紫茎泽兰的发生密度、生长以及开花结实。阔叶林下光照强度的减弱是导致紫茎泽兰发生量减少原因之一。开展植树造林,采用种植青冈林、油茶青冈、油茶柏树混交林等阔叶混栽的方式对紫茎泽兰的发生不仅能起到显著的生态控制效果,而且能绿化荒山,给农民带来经济效益。     

Hepatotoxic and haematological effects of Nigerian Bonny light crude oil in male albino rats

The effect of Bonny light crude oil was assessed in adult albino rats. The rats were administered with 200, 400, and 800?mg/kg of the crude oil orally for 7 days. Fluid intake was measured daily, and the initial and final animal body weight recorded. Oral crude oil at these doses produced no effect on feed and fluid intake between the test groups and the control group. There was a significant decrease in body weight compared to the control group after 7 days of treatment with the different doses of crude oil.

The toxic effects of the liver and hematological effects were assessed. The packed cell volume (PCV) and total white blood cell (WBC) of the 200?mg/kg group were significantly decreased compared to the respective control values. Administration of 200, 400, and 800 mg/kg of Bonny light crude oil, caused a significant dose-dependent increase in glutamic oxaloacetic transaminase (GOT) and glutamic pyruvic transaminase (GPT) levels, but a significant decrease in the alkaline phosphatase (AP) level compared to the control. Histological examination indicates that crude oil induced severe pathologic changes in the forms of necrosis and oedema.     

Effects of UV-light on biochemical composition of silk gland of silkworm,Bombyx mori L. fed an artificial diet

The effects of UV-light on biochemical parameters of posterior silk gland of mulberry silkworm, Bombyx mori L. were investigated in two popular bivoltine hybrids, Jufang (Chinese) × Chenxin (Japanese) and Chenxin × Jufang fed an artificial diet. Larvae of the first day of fifth instar were used for the present investigation. The larvae were irradiated with 20 W of UV-light at the intensity of 40 cm above the larvae for one of three exposure times (30, 60 or 120 min) just before feeding. UV treatment produced no significant effects at 30 min. However, at 60 or 120 min there was a significant decrease in silk gland weight and the levels of total protein, free amino acids, RNA and carbohydrates. UV-light thus affects the biosynthetic activities of silk glands.