龙川江水质污染状况、发展趋势及水污染防治对策

通过对龙川江水质监测资料、水环境状况调查情况的分析，对龙川江水质发展趋势进行了评价和分析，提出龙川江水环境污染防治的对策。     

Overestimates of black carbon in soils and sediments

Several recent reports suggest that black carbon (BC), which broadly encompasses charcoal, soot, and other forms of pyrogenic carbon, may constitute a significant proportion of the refractory carbon in soil and sedimentary organic matter. BC is a sink for biospheric and atmospheric carbon dioxide, and is intimately tied to the biogeochemical cycling of both carbon and oxygen through its role in organic matter cycling. Additionally, BC may represent a large fraction of the missing carbon sink in global carbon accounting. Here, we demonstrate that documented measurements of BC may be the result of methodological artifacts, which inadvertently overestimate the amount of BC. We found that a widely used thermal oxidative method can create a residue that falls under the operational definition of BC in samples that are relatively BC-free. Moreover, during this procedure, labile organic matter constituents are condensed into pyrogenic carbon, implying that the labile components are present in lesser quantities. These methodological deficiencies are promoting overestimates in the amount of refractory carbon in soil and sedimentary organic matter and may endorse inaccuracies in the rates of carbon fluxes, the mean residence times of terrestrial carbon, and organic matter burial rates in oceanic environments.     

characteristics of PM2.5 in rural areas of southern Jiangsu Province, China

Introduction Anumberofstudiesabroadhavedemonstratedthat atmosphericfineparticulatematter(PM2.5,dp<2.5μm)is notonlyassociatedwithatmosphericvisibilityreductionbut alsohasaclearcorrelationwiththenumberofdailydeathsandhospitalizationsasaconsequenceofpulmonarydisease(Chan,1997;Christoforous,2000;Schwartz,1996;Wilson,1997).On18July,1997,theU.S.EnvironmentalProtectionAgency(USEPA)promulgatednewandsevere standardsforfineparticulates(PM2.5)withthesizebelow2.5μm(15μg m3asannualaverage,65μg m…     

The effect of octopamine on behavioral responses of free-foraging bumblebees to a change in food source profitability

The invertebrate neuromodulator octopamine is known to be involved in bees' associative learning, enhancing the responsiveness of a bee to a conditioned stimulus. In this study, we tested the effect of octopamine on the choice behavior of free-flying bumblebees using a two-phase experiment in an array of artificial flowers. During the first phase of the experiment, the bee was allowed to collect octopamine-laden sugar water from two types of equally rewarding flowers (yellow versus blue). In the second phase, one type of flower was set to be unrewarding. The behavior of the bee (proportion of visits to the unrewarding flowers) over the two phases was fitted to a sigmoid regression model. Our results show that octopamine had no significant effect on the bees' equilibrium choice or on the overall rate of the behavioral change in response to the change in reward. Rather, octopamine significantly affected the time interval between the change in reward status and the initiation of behavioral change in the bee.     

GJB 150A淋雨试验强化试验程序数值模拟和试验装置设计研究

目的 研究GJB 150.8A—2009《军用装备实验室环境试验方法第8部分:淋雨试验》中强化试验程序的工程实现方法.方法 在标准解读的基础上,以强化试验程序用喷嘴为对象,建立数值模型,分析喷嘴在强化试验程序过程中的流场分布,并基于分析结果给出强化试验程序试验装置设计的思路和方法.结果 在喷嘴内,压力变化剧烈,极短距离内由276 kPa迅速降至101 kPa.水流经过喷嘴经历了激烈的加速过程,从距离喷嘴出口0.01～0.4 m,水流速度从251 m/s迅速降至17.8 m/s,到远场趋于稳定.结论 分析结果对指导强化试验程序的试验装置的设计和试验实施具有重要参考意义.     

The Value Of Public Participation During a Hazard,Impact, Risk And Vulnerability (HIRV) Analysis

The first part of this paper discusses the links between hazard, risk and vulnerability (HRV) analysis and the development of mitigative strategies. The second part discusses the need to include public participation when completing an HRV analysis. Two current HRV models are used to illustrate the general failure of HRV analysis to include public participation. The third part of this paper provides a brief overview of the Hazard, Impact, Risk and Vulnerability (HIRV) model and its use of public participation. The paper concludes by offering a synopsis of a case study in the town and regional area surrounding Barriere, British Columbia, Canada. This case study demonstrates a positive outcome when public participation is incorporated into an HIRV analysis.     

应用GEM法对硫酸工业中重金属污染的研究

为查明硫酸工业中主要重金属的危害以及不同制酸工艺产生的危害差异，对辽宁省主要生产硫酸企业进行了调研，并应用ＭＥＧ法，对矿石原料中重金属的含量进行了数学模型分析．     

室内培养底栖端足类日本大螯蜚饵料研究

本文在实验条件下探讨了５种饵料对海洋底栖端足类日本大螯蜚的培养效果。实验指标为存活率，生长速度，日增长率和发育状况。结果表明，青岛大扁藻与新月菱形藻１：１混合液的培养效果最佳，合成饲料是较好的补充饵料，螺旋藻粉不宜作为日本大螯蜚的培养饵料。动物性饵料培养效果不如植物性饵料，但对日本大螯蜚的早期快速成长具有一定的促进作用。     

微机上冲裁CAD系统的开发

此文介绍了一套在微机上开发的冲裁CAD系统。它以Foxbase作为数据库管理系统,Trubo C为编程语言,能进行冲裁件图形输入与显示、工艺性分析、优化单排排样和选择板材规格、冲裁件尺寸识别和模具刃口尺寸计算、冲裁力和压力中心计算、以及凹模周界尺寸计算等。本系统主界面为下拉式菜单界面,全中文提示,人机界面友好,具有较好的可扩充性和容错性。     

鉴赏类课程中现代教育技术的开发和应用

本文就鉴赏类课程中现代教育技术的开发与应用的问题进行研究,结合现代教育技术的特征和鉴赏类课程自身的特点,提出了教学资源网络化、教学过程多媒体化、教学评价自动化等观点。