THE RBSEARCH OF MATERIAL PROPERIES AND FILTRATION WATER LOSS OF CORDIERITE-MULLITE MEDIUM

This paper introduces conclusively the materlal properties,the model comparisontest , the produtive comparison test,and the formula of clean filter bed of cordierite-mullite medium.Almost all the parameters of cordierite-mulli te medium are better than those of sand medium.     

武汉地区玉米安全度夏技术研究

对４．７２万ｔ水分为１３．０％～１５．５％的东北玉米,冬秋季节以通风降温为主;气温气湿上升季节以密闭湿为主;度夏期间采取磷化铝片低剂量密半或间歇密半防治害虫和掏老菌危害;度夏后适时敞堆散湿降浊等技术措施。便玉米安全储藏顺利度夏,延缓品质陈化效果显著。曙测表明,玉米烘伤料的的酸值明显主于正常玉米籽粒。     

THE DETERMINATION OF THE SURFACE AREA AND PORE DISTRIBUTION OF FINE IRON OXIDE PARTICLES

The surface quatities of fine iron oxide particles are studied. The pore distribution and surface a area are determined and calculated. The results show that the surface area is 290m/g, 830m/g and the middle-pore(20~50A )is the main part of the fine iron oxide particles prepared by the colloid chemical method.     

THE COMPARISON OF TWO METHODS FOR LOAD EXPRESSION IN PRODUCTION SIMULATION

Two methods for load expression in production simulation are studied,and the errors are analyzed and compared when the two methods are used in the direct method of probabilistic production simulation.     

Fault Tree Analysis for Reliability of Water Distribution Network System〖JP〗

This paper discusses the failure of the network, and draws a fault tree of the water distribution network. And on that basis, the fault tree is investigated through the qualitative and quantitative analysis.     

河北土壤铜的含量和分布

河北省土壤铜含量丰富.全铜平均25.4ppm,高于全国、世界平均含量.有效铜(DTPA—C_u)平均1.17ppm,<0.5ppm低铜土壤只占耕地总面积的6%.高铜土壤多分布在城镇郊区、洼淀和矿区土壤上.铜在剖面中以淋溶为主,表层富集过程非常微弱.土壤铜含量决定于母质类型.在成土过程中其数量变迁与土壤机械组成、土壤有机质、土壤碳酸钙、土壤PH等有关.     

河北省土壤锰的含量与分布

河北省土壤全锰平均值569ppm,低于全国和世界平均值.对5,253个土壤样本用DTPA提取的有效锰平均5.8ppm.全省73.7%的样本,79.8%的耕地有效锰低于临界缺乏值(7ppm).这预示施用锰肥有着巨大的增产潜力.本文讨论了成土母质、土壤质地、碳酸钙、pH、有机质和土壤湿度等对土壤锰含量和消长的影响以及它们之间的统计学关系.     

银川市鸣翠湖湿地水质评价与污染物空间分布研究

为了避免单点位湖泊水质分析的片面性,提高湖泊水质分析的准确性,明确湖泊水质空间分布的特征,对银川市鸣翠湖利用国标水质分析检测方法,开展多点位水质综合评价,同时利用GIS空间分析手段中的反距离权重法,开展污染物空间分布研究。结果显示,湖泊内部不同区域综合水质评价结果存在一定的差异,单点位水质分析的结果不足以反映湖泊整体水质状况,污染物空间分布显示对水质影响较大的BOD5、CODcr、氨氮、总氮空间分布变化明显。空间分布的结果可以为湖泊水质的综合治理指明方向。因此,天然湖泊水质分析应进一步开展多点位综合评价和污染物空间分布研究。     

Multi-objective Optimization of Water Quality Performance Considering THM in Water Distribution Systems

As for optimizing performance of chlorine and trihalomethane (THM) in water distribution systems, an expression measuring THM performance and a derivation of THM-I/O model were proposed. And a multi-objective optimization model considering maximizing level of chlorine performance, maximum level of THM performance and minimizing cost of chlorination was also established. Four factors, including bulk chlorine decay coefficient, coefficient of proportionality between THM and chlorine consumption, initial THM concentration in treated water and number of boosters, were evaluated to study their effects on Pareto front of the multi-objective optimization model. Chlorine decay and THM generation were simulated using EPANET_MSX. An improved non-dominated sorted genetic algorithm-Ⅱwith integer code was proposed to optimize the model, and Pareto fronts could be obtained under different conditions. Results show that with the decrease of bulk chlorine decay coefficient, cost of chlorination can be reduced and level of THM performance will be improved. Diminishing coefficient of proportionality between THM and chlorine consumption and initial THM concentration out of reservoir can both improve the level of THM performance, but can not affect the cost of chlorination. Increasing number of boosters can reduce dosage of chlorine, but booster station construction will increase total cost of chlorination. There-fore, reducing the bulk chlorine decay coefficient is the most economical and effective method.     

河北省土壤铁的含量与分布

河北省土壤全铁平均含量为2.71%,低于全国平均值(3%)和世界平均值(3.8%).土壤有效铁(DTPA—Fe)平均值为8.2ppm.全省1/6耕地土壤有效铁低于4.5ppm,近2/3耕地土壤有效铁处于4.5—10ppm之间.本文讨论了成土母质、土壤机械组成、土壤有机质、土壤碳酸钙对土壤铁消长的影响.铁对植物的有效性与锰关系密切.供铁丰富的土壤,也可能由于锰铁比例失调,导致植物发生缺铁症.     

磷化氢与敌敌畏混合熏蒸杀虫试验

进行了磷化氢和敌敌畏混合熏蒸试验,同时研究了不同剂量,不同施药方法,对杀虫效果的影响并与单一使用上述药剂的杀虫效果进行了比较,结果表明,采用ＰＨ３与敌敌畏混合,探管结合埋包施药熏蒸可迅速杀死各发育阶段储粮害虫和书虱,较好地解决了重复熏蒸问题。     

大豆水溶性蛋白含量测定的不确定度评定

建立大豆水溶性蛋白含量测定（NY/T 1205-2006）不确定度评定的数学模型,对检测过程中带来的各个不确定度分量进行识别和量化,提出应用该方法检测的不确定度评定结果。     

磷化氢熏杀其抗性害虫实仓试验

用磷化铝片对储藏在房式仓（仓容５１６ｍ３）中的４００ｔ散装小麦进行熏蒸。储 不小麦水分为１１．５％,储藏平均温度为２９．３℃,小麦用ＰＶＣ（厚度０．１２５ｍｍ）复盖。熏 蒸期间用磷化氢检测管测定ＰＨ3浓度。采用１．０３ｋｇ磷化铝片（可释放０．３４ｋｇ磷化氢） 分成小包进行熏蒸,磷化氢最高值为 １． ０ｍｇ／Ｌ。熏蒸 １６天的 ＣＴ值为 ２１３ｍｇ· ｈ／Ｌ。用 敏感和抗性品系的米象和谷蠹进行生物试验表明．熏蒸１个月后所有的成虫都死亡;熏 蒸４２天所有中度抗性的谷蠹没有发现Ｆ１代成虫出现．米象的印和蛹不能发育为成虫。     

干旱区20个紫花苜蓿品种抗旱性研究

该试验测定了20个苜蓿品种的水势、总含水量、自由水量、束缚水量、束/自比以及渗透调节物质.从植物水分生理与生化方面,测试各品种的抗旱性,并结合产草量、品质进行综合评价.从中选出5～6个抗旱性较强、产草量高、品质较好的苜蓿品种,为干旱区选择适宜的苜蓿品种提供具有实用价值的基础资料.     

THE PRINCIPLE OF COMPILING CITY WATER SUPPLY HYDROGEOLOGICAL MAPS AND THE DISCUSSION OF ITS METHOD

On the basis of outlining our present situation of city water supply and itsgeological map compilation,this paper suggests a new principle which should befollowed in the compiling work of city water supply hydrogeological maps and themain contents of compilation and the ways of expression as one of the map com-piliing plans to be discussed in this field.     

光照条件下粉末磷脂储藏稳定性初探

文章叙述了末磷酸脂在一定条件下的储藏稳定性变化规律，以过氧化值（ＰＯＶ）酸价（ＡＶ）为示踪指标，研究在常见的几种光照条件下粉末磷脂品质变化，同时，对不同光线下，不同包装形式的过氧化值和酸价作了分析测定。从实验结果看，光线是粉末磷脂不稳定的主要因素，其中荧光和紫外光对其影响较大。     

房式仓粮堆膜下通风与环流熏蒸共用系统改造试验

对现有房式仓进行局部改造,设计,安装了适当的装置构成既能进行粮堆膜下环流熏蒸,又能进行膜下通风降温降水的“二合一”系统。经实践证明系统设计合理,改造方便,操作简便,投资少,通风,熏蒸效果良好。     

东北玉米通风调质试验

东北地区储粮粮堆由于气候原因存在一个巨大的"冷心",冷心的主要应用方式为膜下环流均温控制和缓式通风上调冷心控粮温,这两种方式都是利用冷资源进行的粮温控制。而目前的粮堆增湿方式主要为湿膜机增湿和各种调质机增湿,利用"冷心"增湿还没有成功的案例。利用冷心增湿,内结露现象很严重,而且容易出现局部水分偏高现象,且违反机械通风操作规程1。但通过缓式通风的精确掌握和粮堆增湿理论的精确控制,大胆试验,事实证明冷心内结露增湿方式是可行的。试验将出仓前平均水分13.5%提高到最高14.8%,平均水分14.1%,达到试验预期目的。试验仓出仓验证实际增量21.05t,效益十分可观。     

冬小麦根系吸水与土壤水分条件关系的田间试验研究

田间试验表明，在冬小麦生长前期，根系对土壤水分的吸收主要集中在８０ｃｍ以上的土，随着根系向纵深方向的伸展，根系对深层土壤水分的利用逐步增大。影响根系对某一层次土壤水分利用的主要原因是该土土壤中根量的大小、根系本身的吸水活力和土壤水分状况。在冬小麦生长后期，其上部土层中根系吸水活力出现下降。根系吸水在土壤中的分布可用活根的根长密度在土壤中的分布和根系吸水与土壤湿度有关的以数与描述。     

A method for drought tolerance screening in sunflower

One difficulty in obtaining drought-tolerant varieties is the unequivocal evaluation of plant response to soil-water deficits. A method is proposed that allows reproducible soil-water deficit treatments to be applied to different sunflower genotypes. Maize ( Zea mays L.) plants were sown in the same pots as but earlier than some sunflower plants in order to rapidly deplete the soil water. This method was compared to a standard method in which plants under evaluation are used to dry out the soil. The method was reproducible in the evaluation of drought tolerance of four sunflower inbred lines. Advantages of the proposed method are that: (i) it allows the desired soil water content to be reached quickly; (ii) the resulting soil water content in the pot is uniform and (iii) the rate of decrease in soil water content is independent of the genotype being evaluated. Data indicate that maize plants had no effect on the growth of sunflower genotypes.