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1.
电感耦合等离子体质谱法在环境监测中的应用 总被引:2,自引:0,他引:2
针对ICP-MS技术的使用特点及其近年来在环境监测领域的应用进行综合阐述,并对ICP-MS技术的发展前景作出简单的评述。 相似文献
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阐述了人类在不同阶段所面临的不同环境问题和未来新技术革命对环境的可能影响,介绍了环境科学随着环境问题的变化而不断发展变化的过程,指出在新技术革命时代环境科学所面临的未来研究课题及任务。 相似文献
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浅谈音乐与体育之缘 总被引:2,自引:0,他引:2
张家凤 《中国环境管理干部学院学报》2006,16(2):123-125
音乐与体育作为人类社会独特的文化现象,在不同时期以各种形式相互融合,共同构成人类自身情感的表达方式,成为“世界语言”。现代社会,音乐以其特有的审美、教育、娱乐功能对社会的进步和发展起着积极的作用。尤其是音乐与现代奥运会结合,传承了奥林匹克精神,扩大奥运会的影响,展示了民族的文化,让我们真实地感受到一种前所未有的改变世界的力量。 相似文献
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Kellie B. Vach Joseph M. Eilers Mary V. Santelmann 《Journal of the American Water Resources Association》2002,38(3):773-787
ABSTRACT: Simulated water quality resulting from three alternative future land‐use scenarios for two agricultural watersheds in central Iowa was compared to water quality under current and historic land use/land cover to explore both the potential water quality impact of perpetuating current trends and potential benefits of major changes in agricultural practices in the U.S. Corn Belt. The Soil Water Assessment Tool (SWAT) was applied to evaluate the effect of management practices on surface water discharge and annual loads of sediment and nitrate in these watersheds. The agricultural practices comprising Scenario 1, which assumes perpetuation of current trends (conversion to conservation tillage, increase in farm size and land in production, use of currently‐employed Best Management Practices (BMPs)) result in simulated increased export of nitrate and decreased export of sediment relative to the present. However, simulations indicate that the substantial changes in agricultural practices envisioned in Scenarios 2 and 3 (conversion to conservation tillage, strip intercropping, rotational grazing, conservation set‐asides and greatly extended use of best management practices (BMPs) such as riparian buffers, engineered wetlands, grassed waterways, filter strips and field borders) could potentially reduce current loadings of sediment by 37 to 67 percent and nutrients by 54 to 75 percent. Results from the study indicate that major improvements in water quality in these agricultural watersheds could be achieved if such environmentally‐targeted agricultural practices were employed. Traditional approaches to water quality improvement through application of traditional BMPs will result in little or no change in nutrient export and minor decreases in sediment export from Corn Belt watersheds. 相似文献
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Titania (TiO2) has been the focus of attention of researchers since the first demonstration of its capability to generate the photocatalytic splitting of water into hydrogen and oxygen. However, there seems to be a recent surge in the research activity, involving modified TiO2 nanoparticles (NP), which are considered to be more effective due to different physicochemical properties in comparison to unmodified fine particle analogs. Several strategies have been employed to modify TiO2 to reduce recombination rates of photogenerated charge carriers to enhance the optimal functioning of TiO2. Doping with cations and anions and coupling it with another semiconductor are the most well-known modification methods used. Titania nanocomposites are known to have a plethora of applications. Photoexcitation of these particles are seen to be extraordinarily effective in eliciting microbial death which makes it an attractive candidate for the manufacturing of antimicrobial coatings. On the other hand, TiO2 induces the oxidation of various organic refractory compounds like tetracycline, sulfamethazine, and bisphenol. The photo-electrocatalytic oxidation technique which amalgamates the principle of photocatalysis and electrolysis serves as a newer, unswerving, and cost effective water treatment process. In the biomedical arena, use is now acknowledged for the photodynamic therapy of cancer, cell imaging, biological sensors, drug delivery system, and as endonucleases. In the commercial front, it is utilized in creams owing to its small particle size, which facilitates absorption through skin. It is also employed as ultraviolet blocking agents in sunscreen and commonly encountered as a brilliant white pigment in paint due to its brightness, high refractive index and resistance to discoloration. Its use in solar cells has also been reported. This review aims to encompass the new progress of modified TiO2 nanocomposites for efficient applications, emphasizing the future trends of TiO2 in arenas like healthcare, environment, biomedical, food, personal care, and pharmacy and also highlights the commercial implications of this promising nanomaterial. 相似文献
7.
Jeffrey Burkhardt 《Journal of Agricultural and Environmental Ethics》1989,2(2):113-128
The concepts of sustainable agriculture, organic agriculture, regenerative agriculture, and alternative agriculture are receiving increasing attention in the academic and popular literature on present trends and future directions of agriculture. Whatever the reasons for this interest, there nevertheless remain differences of opinion concerning what counts as a sustainable agriculture. One of the reasons for these differences is that the moral underpinnings of a policy of sustainability are not clear. By understanding the moral obligatoriness of sustainability, we can come to understand precisely what must be sustained, and by implication, how. This article discusses the arguments that can be advanced for sustaining anything and initially concludes that our obligations to future generations entail sustaining more than just sufficient food production or an adequate resource base. Indeed, a tradition of care and community must underlie whatever agricultural and resource strategies we are to develop under the rubric of sustainability. A consideration of the larger social and environmental system in which agriculture operates and the constraints this system places on agriculture forces us to recognize that sustainability has to do with larger institutional issues, including our ability to incorporate our common morality democratically into our institutions, practices, and technologies. 相似文献
8.
Lantz Miller 《Journal of Agricultural and Environmental Ethics》1998,11(1):1-16
A critique is made of Bernard Rollin's examination of the ethics of cloning adult mammalian cells. The primary concern is less to propound an anticloning or procloning position than to call for full exploration of the ethical complexities before a rush to judgment is made. Indeed, the ethical examination in question rushes toward an ethical position in such a way that does not appear consistent with Rollin's usual methodology. By extending this methodology – which entails full weighing of benefits and costs – it becomes apparent that there are real potential risks to this type of cloning in both animals and humans, besides the possible benefits, and that the scientific, political, philosophical, and broader academic communities should explore these risks and benefits extensively. Rollin's usual methodological call for hesitation before risks would translate into hesitation before the ethical risks of adult mammalian cell cloning instead of his paper's curiously laissez-faire stance. 相似文献
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综述了USB反应器进行生物反硝化的历史沿革、研究现状 ,并对其在研究中存在的问题进行了描述。最后 ,对USB反应器进行生物反硝化的应用前景作了科学的分析 相似文献