Assessment of health risk from organochlorine pesticides residues in high-fat spreadable foods produced in Poland

Currently, butter and margarine are food products attracting wide customer interest. Every day, consumers around the world buy these products for human consumption. Butter is obtained from milk fat, while margarine is derived from vegetable oils. The content of organochlorine pesticide (OCP) residues was examined in both types of these high fatty products. A gas chromatograph with MSD (HP 5973) detector was used for the determination of pesticides such as α-HCH, β-HCH, γ-HCH, DDT, DDD, DDE, aldrin, dieldrin, endrin, heptachlor and heptachlor epoxide. The examined products had diverse concentrations of the analyzed compounds. Visible was the division based on the origin of the product, which might be composed of animal or vegetable fats. The research has revealed the presence of OCP residues in all examined spreads. Quantities of organochlorine compounds did not pose an immediate danger to the consumers’ health. Human and environmental health risk assessment was carried out by the estimation of lifetime average daily dose (LADD) and non-carcinogenic health hazard quotient (HQ). Total estimated LADD ranged between 1.3 × 10^?5 and 3.1 × 10^?5 mg kg^?1 d^?1 for butter, and 1.9 × 10^?6 and 4.6 × 10^?6 mg kg^?1 d^?1 for margarine and mix spread. The HQ ranged between 1.1 × 10^?4 and 3.7 × 10^?4 for butter, and 1.4 × 10^?5 and 9.0 × 10^?6 for margarine and mix spread for adults. These estimated HQs were within the safe acceptable limits, indicating a negligible risk to the residents of the study area.     

区域性应急物资储备级库间的协同选址模型研究

鉴于我国应急物资的多部门分散管理与分散储备的特点,研究了区域性应急物资储备体系构建中的应急物资储备级库协同选址问题。为了实现应急物资在不同级库间的协同储备管理与分散优化调拨,建立了应急物资储备级库选址的协同优化模型。用启发式算法通过MATLAB编程来实现,并用算例进行了验证。     

山西太原都市型现代农业主导产业选择分析

都市型现代农业是我国现代农业的重要表现形式.积极发展都市型现代农业,是大城市现代农业发展的战略取向.然而,在都市农业发展的进程中,主导产业具有极其重要的作用.本文简要回顾了以往的主导产业理论与选择基准,运用区位商法与显示性对称比较优势指数法分析了太原市农业结构内部各行业的比较优势.结果表明:农业的优势区域是尖草坪区、清徐县和小店区;林业在迎泽区、杏花岭区和娄烦县的比较优势明显;种植业在杏花岭区、阳曲县、迎泽区等区县比较优势明显;渔业的生产优势区域为娄烦县、晋源区和迎泽区.籍此,结合太原市的资源禀赋、区位条件等优势,积极选择与识别能够带动太原都市农业快速发展的主导产业,并且结合太原农业发展的现实情况,按照观光休闲农业圈、特色种养农业圈、科技示范农业圈及合作辐射农业圈四个圈层进行合理布局,这是新时期该地区进行产业结构调整与优化、制定产业发展政策及区域经济发展战略规划的重要任务.     

城乡建设用地增减挂钩中拆旧地块选址适宜性评价研究——以辽宁省桓仁县华莱镇为例

为了更加合理的选择拆旧地块,以辽宁省桓仁县华莱镇为例,通过实际分析与特尔菲法选取14个评价指标,通过层次分析法确定指标的权重,采用加权指数和法计算评价得分,并运用累积曲线分级法将评价对象分为四类区域。结果表明最适宜拆旧区占居民点总面积的4.14%,适宜拆旧区占居民点总面积的6.16%,不适宜拆旧区占居民点总面积的31.91%,最不适宜拆旧区占居民点总面积的57.79%。     

基于REST+RIA架构的水环境监测点位管理系统

针对目前水环境点位管理中系统化、规范化和标准化方面存在的问题,提出采用REST+RIA的软件架构,引入CA认证技术和GIS技术构建水环境点位管理系统,满足点位管理业务复杂性的要求.结合关键技术对系统的逻辑架构、部署方案、点位管理的业务流程进行了分析和介绍.     

ANALYSIS OF PUMPING TESTS: SIGNIFICANCE OF WELL DIAMETER,PARTIAL PENETRATION,AND NOISE1

ABSTRACT: The nonlinear least squares (NLS) method was applied to pumping and recovery aquifer test data in confined and unconfined aquifers with finite diameter and partially penetrating pumping wells, and with partially penetrating piezometers or observation wells. It was demonstrated that noiseless and moderately noisy drawdown data from observation points located less than two saturated thicknesses of the aquifer from the pumping well produced an exact or acceptable set of parameters when the diameter of the pumping well was included in the analysis. The accuracy of the estimated parameters, particularly that of specific storage, decreased with increases in the noise level in the observed drawdown data. With consideration of the well radii, the noiseless drawdown data from the pumping well in an unconfined aquifer produced good estimates of horizontal and vertical hydraulic conductivities and specific yield, but the estimated specific storage was unacceptable. When noisy data from the pumping well were used, an acceptable set of parameters was not obtained. Further experiments with noisy drawdown data in an unconfined aquifer revealed that when the well diameter was included in the analysis, hydraulic conductivity, specific yield and vertical hydraulic conductivity may be estimated rather effectively from piezometers located over a range of distances from the pumping well. Estimation of specific storage became less reliable for piezometers located at distances greater than the initial saturated thickness of the aquifer. Application of the NLS to field pumping and recovery data from a confined aquifer showed that the estimated parameters from the two tests were in good agreement only when the well diameter was included in the analysis. Without consideration of well radii, the estimated values of hydraulic conductivity from the pumping and recovery tests were off by a factor of four.     

德阳市区域环境噪声普查优化布点方法研究

本文通过对德阳市区域环境噪声普查优化布点方法的研究,提出了一种简便、快速、实用的区域环境噪声普查优化布点方法。     

长管拖车气瓶声发射技术定位检测方法分析

长管拖车气瓶是盛装有危险介质的高压储运设备,能否进行及时有效的检验,是保障其安全可靠运行的关键。我国开始长管拖车气瓶的应用、研究时间不长,相关积累不充分,而现有的水压试验法对危险性缺陷不敏感。声发射检测是动态缺陷整体检测的有效方法,将其应用于长管拖车气瓶的检测可节省大量的时间和人力、物力。对框架式长管拖车气瓶进行了不拆车声发射定位试验,测定了瓶体上断铅源声发射信号随距离衰减的曲线,采用数值分析方法得到曲线拟合方程式,探讨总结出定位过程中声发射采集的关键参数——门槛、探头间距和声速的设定方法和初始值,以及拖车结构对定位的影响,为长管拖车气瓶声发射定期检验工作的开展提供了参考,在分析定位源强度、定位方法研究方面有重要意义。     

兼顾公平与效率的无人机应急中继通信选址优化问题

为提高应急救援中无人机应急中继通信资源配置的公平与效率,在考虑无人机中继通信覆盖范围限制、各受灾用户集群点分布情况、受灾群众公平性感知的基础上,构建以最大化系统吞吐量为效率目标、最小化受灾群众公平损失值为公平目标的无人机应急中继通信选址多目标0-1非线性整数规划模型,采用基于k-means的模拟退火算法对其进行求解,并以实际案例为背景构造算例,验证本文提出模型和算法的可行性与有效性,并进行多目标分析及参数敏感性分析。研究结果表明：本文提出的模型和算法能在较短时间得到无人机应急中继通信选址方案,保证所有受灾用户集群点获得通信中继;同时,确定最佳无人机设备数量,验证公平目标与效率目标存在悖反关系。