大气腐蚀对产品影响的研究

大气腐蚀是最普遍的一种腐蚀形式，在不同环境它所造成的危害都是不可忽视的，本文概括了大气腐蚀的几种类型，分析了其腐蚀过程及机理，并从影响大气腐蚀的因素总结了大气腐蚀的几种防护控制方法。     

Agricultural practices,ecology, and ethics in the third world

The increasing demand for horticultural products for nutritional and economic purposes by lesser developed countries (LDC's) is well-documented. Technological demands of the LDC's producing horticultural products is also increasing. Pesticide use is an integral component of most agricultural production, yet chemicals are often supplied without supplemental information vital for their safe and efficient implementation. Illiteracy rates in developing countries are high, making pesticide education even more challenging. For women, who perform a significant share of agricultural tasks, illiteracy rates are even higher than for men. The dilemma exists of how a developing country can improve its nutritional and economic situation without giving consideration to social and environmental consequences.     

Commercial Medicinal Plant Extraction in the Hills of Nepal: Local Management System and Ecological Sustainability

This paper presents a case study from Jumla District, Nepal, investigating local management systems and ecological sustainability of commercial collection of a medicinal plant, spikenard (Nardostachys grandiflora DC, Valerianaceae), growing in alpine meadows. Interviews were undertaken with local collectors, traders, and district forest office staff, and the dynamics of people–plant interactions are analyzed using the Oakerson model. In all, 110 sample plots 1m square were laid out in three areas with differing collection and grazing pressures for recording of floristic composition and abundance of spikenard root biomass. Comparisons show significantly more root biomass in uncollected than collected areas with local management and the interpretation of differences in abundance is discussed. The combination of qualitative and quantitative investigations can provide a framework for the study of people–plant interactions, and this study can serve as first step in a compilation of cases to create a more detailed picture of local management systems of Nepali nontimber forest products in general and commercially collected medicinal and aromatic plants in particular.     

打造中国第一生态桃园--成都市龙泉驿区生态农业旅游开发构想

根据龙泉驿区生态农业旅游开发的有利条件,提出了打造"中国第一生态桃园"的构思--生态旅游开发思路、主题定位、旅游产品设计等.最后,提出该区生态农业旅游的开发对策与措施.     

灾害间接经济损失的计量

本文研究了三种灾害间接经济损失的计量，即间接停减产损失、中间投入积压增加损失和投资溢价损失。利用了城市投入──产出表所表达的产业关联关系估计了由于生产的联锁性造成灾害的进一步损失。并用上海市的实际数据对地震的间接经济损失作了预测计量。     

环巢湖水资源特色旅游开发研究

随着区域经济的发展，环巢湖区域旅游日渐兴起。从发展区域经济、开发优势资源和形成旅游吸引力3个方面分析，环巢湖水体旅游资源特色开发具有必然性。根据生态化、序位性、个性化、市场化的原则，可考虑开发5种特色旅游产品：湖光山色文化游、温泉保健度假游、两岸观光休闲游、农家亲水生态游、水战遗迹科考与红色游。     

食品安全环境下的肉类食品可追溯系统的构建

食品安全问题已成为全球共同关注的问题,为了加强食品安全管理,许多国家正在研究和实施食品可追溯系统。随着社会对食品安全的关注,人民生活质量的不断提高,我国食品安全问题及面临的形势十分严峻,必须加快构建可追溯系统来保障肉类食品安全。笔者在综述肉类食品可追溯系统的基础上,分析和研究适合国情的可追溯系统所需的技术,并对可追溯信息系统进行需求分析,进而建立可追溯信息系统的功能模型,指出了可追溯系统的发展方向和趋势,讨论了可能存在的问题并给出了建议,为实施可追溯系统提供参考。     

氧弹燃烧-离子色谱法测定高分子聚合物的卤素

随着欧盟RoHS标准的实施,对塑料制品中卤素的检测也越来越受到重视。文章建立了一种采用氧弹燃烧法对塑料样品进行燃烧,以碳酸钠为吸收液进行吸收,离子色谱法分离测定微量卤素离子的方法。选择的色谱条件是:IonPac AS22离子交换柱,0.48mmol/L碳酸钠和0.1 mmo/L碳酸氢钠混合液作淋洗液,流速为1.0 mL/L,抑制型电导检测。氟、氯、溴、碘四种卤素的检测限(3倍噪声比)分别为0.007、0.009、0.027和0.033.相对标准偏差分别为1.19%、1.61%、1.02%和1.28%,回收率为78.2%~119.8%。方法具有简便、准确、灵敏等特点,可较方便地应用于常规的质量检测和控制。     

北京市某家具城室内空气污染水平与特征

为了解家具城室内空气污染状况,于2009年夏采样测定了北京市某家具城多个展区空气中苯系物(苯、甲苯、二甲苯)、总挥发性有机物(TVOC)、甲醛等羰基化合物的浓度.家具城室内空气中甲醛、苯、甲苯、二甲苯和TVOC的总体浓度(均值±标准差)分别为:(0.37±0.08)、(0.04±0.03)、(0.19±0.16)、(0.47±0.57)和(2.76±2.18)mg/m3;甲醛、二甲苯、TVOC的室内浓度分别为室外浓度的22、46和34倍.甲醛、二甲苯、TVOC的平均浓度均超过《室内空气质量标准》所规定的标准值,甲醛、TVOC最高浓度分别是标准值的5.1倍和14.8倍.家具城内羰基化合物总浓度为(689.3±94.8)μg/m3,超过室外浓度5倍,其中甲醛和乙醛的浓度最高,二者浓度之和占羰基化合物总浓度的75%以上;丙酮、4碳羰基化合物(异丁烯醛、甲乙酮、正丁醛)和己醛的浓度也较高.总之,家具城存在严重的室内空气污染.     

Effects of different mixing ratios on emissions from passenger cars fueled with methanol/gasoline blends

The effects of different mixing ratios of methanol/gasoline blends and new three-way catalytic converter on regulated and unregulated emissions, especially VOC and carbonyl compound emissions were investigated.