Vocal acrobatics in a Chinese frog, <Emphasis Type="Italic">Amolops tormotus</Emphasis>

Although amphibians are highly vocal, they generally emit only a limited number of acoustic communication signals. We report here the extraordinarily rich vocal repertoire of Amolops tormotus, a ranid species in China. These frogs produce countless vocalizations, some of which share features of birdsong or primate calls, e.g., ultrasonic frequency components, multiple upward and downward FM sweeps, and sudden onset and offset of selective harmonic components within a call note. Frame-by-frame video analysis of the frog's calling behavior suggests the presence of two pairs of vocal sacs that may contribute to the remarkable call-note complexity in this species. Electronic supplementary material to this paper can be obtained by using the Springer LINK server located at http://dx.doi.org/10.1007/s00114-002-0335-x.     

Preparation of PFS coagulant by sectionalized reactor

The oxidation rate of ferrous sulfate is investigated for the preparation of polyferric sulfate(PFS)coagulant.In is proved that this reaction is zero order with respect to Fe^2 ,first order with respect to NO2(g),and first order with respect to the interface area between gas phase and liquid phase.According to this mechanism,sectionalized reactor(SR) is used in place of traditional reactor(TR),and the liquid of reaction mixture is recycled by pump.As a result,not only the flow path of reaction liquid is prolonged,but also gas-liquid contact area enlarged,and the reaction distinctly accelerated,compared with traditional reactor.The effects of parameters including temperature,acidity and others on the reaction rate are also discussed.     

试论水质管理与饮水安全

随着生活水平的不断提高，人们对饮用水质量提出了更高的要求，而水环境质量的普通恶化又使人们不得不考虑饮用水的安全性。在简介了我国水资源现状的基础上，文中阐述了水质问题的重要性和我国水体环境质量的严峻性，指出了水质问题不仅制约着社会经济的发展，更直接地丰人们饮用水的安全性，已成为进入21世纪我国水资源问题的主要矛盾；在分析了我国水资源水质管理存在问题的基础上，从法律、法规、政策、经济等方面，着重探讨了加强水质管理与解决水资源供需矛盾和保证饮用水安全的关系。     

本溪市空气质量控制方案实施评估

利用攻坚计划行动方案所涉及的污染源排放清单和扩散模型计算了环境中的污染物浓度，并将污染物浓度／人口分布和剂量一反应函数联系起来，根据方案实施前后污染物排放量的变化，分析对人体健康影响的变化，将损害的减少程度进行货币化计算，继而将影响成本和削减方案成本进行比较，评估方案的效益。     

膜生物反应器处理印染废水的研究进展

印染废水是一种有机物含量高、色度深、生化性差、难降解的工业废水,采用传统的污水处理工艺很难达到排放标准,对新型、高效的处理工艺的研究越来越受到人们的关注.膜生物反应器是一种新型水处理技术,具有传统废水处理工艺所无法比拟的优势,通过膜生物反应器处理后的印染废水,甚至达到了回用水标准,在此基础上对现在研究较多的膜生物反应器的改进技术进行了综述并指出了还有待解决的问题,为将来的发展提供参考和依据.     

黑龙江省土地沙漠化控制作用重要性评价

根据黑龙江省沙漠化现状和评价方法与指标对黑龙江省的生态系统进行沙漠化控制作用重要性评价,评价结果将黑龙江省沙漠化控制重要地区分为4级,即极重要、中等重要、比较重要和一般重要四个级别,确定了它们的分布区域.这一成果为黑龙江省生态功能区划和区域可持续发展奠定了基础,提供了科学依据.     

Effects of environmental factors on the production and release of matrix-bound phosphine from lake sediments

Effects of pH, temperature, and oxygen on the production and release of phosphine in eutrophic lake sediments were investigated under laboratory tests. Results indicated that the elimination of matrix-bound phosphine was accelerated under initial pH 1 or 12. Phosphine levels could reach maximum under initial pH 10. The contents of phosphine increased with the addition of alkali under pH 4–12. The rates of phosphine production and release from lake sediments varied with temperature. 20°C was the most favorable temperature for the production of matrix-bound phosphine. Oxygen showed little effect on matrix-bound phosphine. Matrix-bound phosphine concentrations in lake sediments were concluded to be dependent on a balance of natural generation and depletion processes. Translated from Acta Scientise Circumstantiae, 2005, 25(5): 681–685 [译自: 环境科学学报]     

Spatial distribution of ecological security status assessment of West-Liaohe River based on geographic information system

Eco-security assessment is a hot research area in resource and environmental science, which involves data with much spatial, non-linear, and random features. Geographic information system (GIS), as a useful tool to analyze and manage spatial information, has a superior advantage in this field. A case study in the western part of the Liaohe River featuring a method of eco-security spatial differences (ESSD) based on GIS is developed in this paper. The method includes four steps: 1) developing the pressure-state-response (P-S-R) framework with site data; 2) digitizing West-Liaohe River and setting its GRID database of ecosecurity assessment indicators; 3) figuring out the relative membership degree (RMD) of eco-security indicators by using the analytical hierarchy process with the weight of indicator; 4) classifying the security zone and mapping the assessment result of eco-security status in grid by GIS method of assigning and clustering. The visual spatial differences of eco-security based on GIS enables decision makers to know the status of eco-security better in making policies for achieving sustainability. __________ Translated from Environmental Science, 2005, 26(5): 28–33 [译自: 环境科学]     

浅谈化工装置灾害事故的处置

化工生产一般采用温控分离、氧化还原、催化裂解、压力聚合等工艺方法,而化工产品特别是中间产品一般都具有易燃、易爆、有毒、有害和腐蚀等特点.在化工生产的过程中可能发生的各类灾害事故已经成为各级政府和应急救援单位研究的重要课题.下面结合工作实践谈谈化工装置灾害事故的处置思路.     

SBR处理城市污水中强化脱氮除磷的研究

根据SBR工艺的特征以及氮和磷的去除机理,通过对SBR运行方式进行分析后提出了同时具备脱氮除磷功能的改进的运行方式,并对影响SBR工艺处理效果的因素进行了分析。