异源精子激发彭泽鲫雌核发育产生的子一代及亲本RAPD分析

对异精激发彭泽鲫雌核发育产生的子一代及双亲进行ＲＡＰＤ 分析,发现异育彭泽鲫子一代中含有少数与父本相同而与母本相异的特异条带．尖鳍鲤、须鲫激发产生的异育彭泽鲫后代与彭泽鲫母本相似率分别为９４．９６％ 、９４．７０ ％ ;与尖鳍鲤、须鲫父本相似率分别为２３．４６％ 、２１ ．０５％ ．结果表明,从基因水平检验,彭泽鲫已不再是完全的母性遗传,异育彭泽鲫基因组ＤＮＡ中可能带有部分异源父本基因组ＤＮＡ的特性     

Density estimation using ranked-set sampling data

The ranked-set sampling (RSS) is applicable in practical problems where the variable of interest for an observed item is costly or time-consuming but the ranking of a set of items according to the variable can be easily done without actual measurement. In the context of RSS, the need for density estimation arises in certain statistical procedures. The density estimation also has its own interest. In this article, we develop a method for the density estimation using RSS data. We derive the properties of the resulted density estimate and compare it with its counterpart in simple random sampling (SRS). It is shown that the density estimate using RSS data provides a better estimate of the density than the usual density estimate using SRS data. The density estimate developed in this article can well serve various purposes in the context of RSS.     

Oxidative treatment of simulated dyehouse effluent by uv and near-UV light assisted Fenton's reagent

UV/Fenton, near-UV-visible/Fenton, dark Fenton, and H₂O₂/UV reactions have been used to treat simulated dyehouse effluents representing wastewater from the textile dyeing and rinsing process. Experiments were carried out in a lab - scale photochemical reactor using concentrations of 0.5–25 mM H₂O₂, 0.04-0.5 mM Fe²⁺-ion and different dilutions of textile wastewater. To assess the extent of mineralization, decolourization kinetics and the effect of different fight sources on treatment efficiency, DOC, optical density at 254 nm and 600 nm wavelength and residual H₂O₂ concentrations were measured during the course of the advanced oxidation reactions. Comparative evaluation of the obtained results revealed that the decolourization rate increased with applied H₂O₂ and Fe²⁺-ion dose as well as the strength of the synthetic textile wastewater. The best results were obtained by the near - UV/visible/Fenton process with a decolourization rate constant of 1.57 min⁻¹, a UV_254nm reduction of 97% and a DOC removal of 41% at relatively low doses of the H₂O₂ oxidant and Fe²⁺-ion catalyst within 60 min treatment time.     

自然老化木材燃烧过程热行为特性研究

为提供古建筑火灾数值模拟及风险评估的基础理论,从自然老化角度入手,选取经过长久自然老化的建筑服役木材作为研究对象,通过扫描电镜(SEM)及热物性试验对比分析自然老化木材与参照木材的外观形态及热传导特征;采用差示扫描量热DSC法,研究自然老化木材在燃烧过程中热释放的阶段特性,分析不同升温速率对老化木材热行为影响特征;基于...     

自动电位滴定法测定气田废水中的C1~-

利用电位滴定法在７１６ＤＭＳ型自动电位滴定仪上实现对气田废水中Ｃ１－的快速、灵敏、准确测定,避免了色度、浊度的干扰。对方法的检出限、标样和实际水样精密度、准确度,进行了全面的测定分析,并与硝酸银滴定法进行了对比。氯化物的检出限为０．３２ｍｇ／Ｌ;相对标准偏差小于等于２．１％,加标回收率在９８．９％１０１％范围内,对同一标样和实际样品的测定两种方法的结果吻合较好。     

朝阳市农村能源的开发利用

本文简述了朝阳市农村能源的种类、数量及能源消耗状况,分析了农村能源在供需过程中存在的主要问题,并提出了相应的防治对策。     

促燃脱硫剂对煤炭清洁燃烧的功效及机理分析

用微机热天平和色谱方法测试和研究了促燃脱硫剂在降低煤炭的着水温度、改善煤炭燃烧特性、减少煤炭燃烧造成的环境污染等方面的节能和环保功效。试验结果表明：ＣＣＳ型燃煤促燃脱硫剂能降低煤炭着火温度３０℃～８０℃,提高煤炭利用率１０％～２５％,固硫率３０％～５０％,且明显降低ＣＯ排放量和排烟黑度。本文初步探讨了其作用机理。     

曝气生物滤池处理生活污水试验

曝气生物滤池具有体积小、处理效率高等特点。研究结果表明,曝气生物滤池处理生活污水在０．５３ｍ／ｈ的水力负荷下,ＢＯＤ５、ＣＯＤ、ＳＳ、ＮＨ４－Ｎ和ＴＮ的平均去除率９５．３％、９２．６％、９６．７％、９１．８５％和８５．１％,平均出水浓度分别为３．０ｍｇ／Ｌ、１２．５ｍｇ／Ｌ、２．５ｍｇ／Ｌ、１．７ｍｇ／Ｌ和４．３ｍｇ／Ｌ。     

能量耗损相关底物消耗对微生物产率的影响

根据底物反应平衡,提出在底物充分的条件下,微生物消耗的底物总量等于微生物生长所利用的量,微生物维持代谢所利用的量及由于能量代谢分离而消耗的量之和,由此,建立了描述在底物充分的条件下,微生物产率与剩余底物浓度相应关系的动力学模型,证明了观测到的产率随剩余底物２的增加而减少的现象,此模型能很好实验数据相符,结果表明随剩余的底物２的增加,微生物的产率可下降７０％左右。     

电化学法处理含盐染料废水

研究了电化学法处理含盐染料废水的可行性及其处理效果．结果表明,电化学法对废水的色度和COD具有良好的去除效果,电解过程中余氯的产生对色度和COD的去除有决定性作用．实验确定的高浓度含盐废水电化学处理条件为：电流密度0．017A/cm²,电压10．3V,平均电导率12．35ms/cm,电解60min,色度和COD的去除率分别为85％和99．8％．电解过程无难以继续反应的中间产物生成．