TRMM降水产品在鄱阳湖流域的精度评价

为对比TRMM 3B42 V6和V7两种版本的降水产品在鄱阳湖流域的估算精度,了解TRMM卫星资料在中国南方湿润区的应用前景,利用2003~2010年V6和V7在鄱阳湖流域的降水产品以及同期实测降水数据,从不同时间和空间尺度对比二者在鄱阳湖流域降水的估算精度。结果表明:(1)在年降水总量上,V6和V7的降水估算与实测降水差别不大,而在季和月降水尺度上,V6和V7的估算精度开始有所下降,但V7比V6结果要好一些,V7与实测降水的相关系数比V6与实测降水的相关系数高出0.1以上;(2)空间分布来看,V6和V7都能刻画出鄱阳湖流域降水自西南向东北方向递增的空间格局,但在修水流域和赣南地区,V6与实测降水偏差较大,而V7在这两个区域的降水估算精度有较大改善。总的来说,在鄱阳湖流域,V7估算的降水精度比V6有较大的提升。     

Reduction of hexavalent chromium using fungi and bacteria isolated from contaminated soil and water samples

The reductive adsorption of hexavalent chromium (Cr⁶⁺) using six indigenous microorganisms isolated from contaminated soil and water samples was investigated. Quantification of Cr⁶⁺ reduction was determined using the 1,5-diphenylcarbazide method followed measuring the absorbance at OD₅₄₀. Bacterial isolates identified as Klebsiella pneumoniae, Bacillus firmus and Mycobacterium sp. were capable of absorbing Cr⁶⁺ efficiently into their biomass, whereas the fungal isolates, Aspergillus flavus, Aspergillus sp. and A. niger were capable of transforming Cr⁶⁺ to Cr³⁺ relative to cell-wall-binding properties. Infrared spectral analysis of functional groups showed that ?OH, ?NH₂ and C?O with conjugated ?NH were the binding groups responsible for adsorption of Cr⁶⁺ within the biomass of isolates. The data highlight the promising biotechnological application of these isolates in removing carcinogenic and mutagenic Cr⁶⁺ from contaminated ecosystems.     

基于erdas＋VB6．0的数字栅格地图（drg）纠正方法

以1：5万比例尺数字栅格地图（drg）纠正为例，简单介绍1：5万比例尺地形图采用的投影与坐标系，并介绍一种基于erdas＋YB6．0的1：5万比例尺数字栅格地图纠正方法。     

Microsatellite length polymorphisms associated with dispersal-related agonistic onset in male wild house mice (Mus musculus domesticus)

Dispersal propensity, reflecting one of the most decisive mammalian life history traits, has been suggested to vary heritably and to locally adapt to prevailing dispersal conditions in wild house mouse populations. Because individual dispersal propensity highly significantly covaries with the developmental timing of the onset of agonistic interactions between littermate brothers, we used agonistic onset as an endophenotype to explore the potential genetic basis of dispersal-related behavioral variation in male house mice. We found significant covariation of microsatellite marker compositions with the probability of fraternal pairs to exhibit agonistic relationships before the age of 2 months. In particular, the presence of two alleles associated with a serotonin transporter protein gene (Slc6a4) and a testosterone dehydrogenase gene (Cyp3a11), respectively, strongly covaried with the probability of early agonistic onset. These results are congruent with recent findings of microsatellite length polymorphisms marking regulatory variation of gene expression that is relevant for social behavior, including dispersal propensity development, in other mammals. Genetic variability for ontogenetic timing of agonistic onset would be in agreement with genotypic differentiation of the dispersive behavioral syndrome in natural populations that could lead to local adaptation.     

基于IPV6的嵌入式视频监控系统

本文通过分析IPv6嵌入式监控系统的研究现状及其实现方法,并结合应用实际,确定了采用具有TCP/IPv6网络协议栈的uClinux嵌入式实时操作系统,视频解压缩方而采用目前比较流行且成熟的MPEG-4技术,实现嵌入式视频监控系统在IPv6环境下的应用方案.论文重点研究了系统软件构架所采用的思想策略及实现,详细分析了RTP音视频传输系统实现策略和在DirectShow中的实现,给出了IPv6组播技术及安全策略的具体实现,最后给出了测试运行结果和结论.     

“Horizontal” and “vertical” diffusion: The cumulative influence of Impact and Benefit Agreements (IBAs) on mining policy-production in New Caledonia

The scale, duration and intensity of conflicts over mineral resources vary greatly. However, they always involve, in varying proportions, the triad stakeholder model—corporation, state, community—each element of which is internally heterogeneous. Increasingly, new players are entering the scene: international non-governmental organizations (NGOs), environmental grassroots groups, indigenous transnational networks, international aid and development agencies. Nevertheless, conflicts and arrangements around access to and control over mineral resources can take the apparent form of dyadic relationships between companies and local communities, resulting in negotiated company-community agreements, often called “Impact and Benefit Agreements” (IBAs). In our analysis, local agreements on mineral resource governance are seen as building blocks in the production of mining policy “from below”, even though they seem at first sight to exclude the state. This paper argues that these agreements, and the negotiations surrounding them, inform debates around mining through both “horizontal diffusion” (influence on other localities facing similar situations) and “vertical diffusion” (influence on policy design and implementation at upper political and administrative levels). This diffusion may occur in a “positive” sense, effecting further change in line with the intent of the original agreement, or in a “negative” one, actually making substantive change less likely, whether at a community or policy level. We build this argument through two case studies from New Caledonia, in the south-west Pacific, where mining has long been a key issue, especially in the current context of “negotiated decolonization” launched by the 1998 Nouméa Accord.     

基于STM32F103RBT6的振动信号采集系统

对一种监测振动信号采集系统进行了设计,系统以STM32F106RBT6型单片机为设计核心,并对传感器供电电路,信号调理电路,AD转换模块,通讯模块进行了分析。通过MATLAB对傅里叶变换进行了设计,对一些模拟信号进行了实测分析,实现了高精度模拟数据采集,可用于振动信号的采集,该振动信号采集系统具有功能强大,成本低,高精度,体积小等优点。     

Factors related to presenteeism among employees of the private sector

The objective was to explore the relationship between person-based variables and work-related variables of presenteeism in four different private sector workplaces. Employees (N=413) filled in a questionnaire related to demographic and socio-economic characteristics, social networks, work-related factors, lifestyle factors and state of health. Presenteeism was assessed using the Stanford Presenteeism Scale 6 (SPS-6). The majority of respondents were male (77.2%), and mean age was 34.7±8.1 years. The prevalence of chronic conditions was 15.9%. The mean score for the SPS-6 was 19.9 (SD, 3.3). The female score was higher than the male score on the SPS-6 in this study. Total score was higher among workers who reported working at high speed. SPS-6 score was higher among individuals with a chronic health problem. Understanding of the workplace and personal factors related to presenteeism may support the health and well-being of workers.     

The effects of Orimulsion and Fuel Oil #6 on the hatching success of copepod resting eggs in the seabed of Tampa Bay,Florida

A 3-month microcosm study was conducted to observe the potential effects of two fuels, Orimulsion and Fuel Oil #6, on the hatching success of copepod resting eggs in the seabed of Tampa Bay, Florida. Microcosms were dosed with one of five hydrocarbon treatments via hydrocarbon-coated sand and compared with controls. Acartia tonsa eggs were nonviable in all treatments after only a few weeks of incubation, as evidenced by a marked decline in the abundance of nauplii. However, there was no evidence that exposure to simulated spills of 700 or 7000 ppm of either fuel led to significant increases in resting egg mortality as compared with controls. The results further indicate that, regardless of environmental conditions, resting eggs of A. tonsa do not remain viable in the sediment for extended periods of time.     

ROADWAY-2: A Model for Pollutant Dispersion near Highways

The formulations and evaluation of ROADWAY-2, a near-highway pollutant dispersion model, are described. This model incorporates vehicle wake parameterizations derived from canopy flow theory and wind tunnel measurements. The atmospheric velocity and turbulence fields are adjusted to account for velocity-deficit and turbulence production in vehicle wakes. A turbulent kinetic energy closure model of the atmospheric boundary layer is used to derive the mean velocity, temperature, and turbulence profiles from input meteorological data. ROADWAY-2 has been evaluated using SF₆ tracer data from General Motors Sulfate Dispersion Experiment. The model evaluationresults are presented and discussed.