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1.
此文提出了内螺纹变截面铜管分段拉仲一次成形新工艺,并就工艺因素对该管拉伸成形的影响进行了试验研究,从而为合理制订成形工艺提供了依据。 相似文献
2.
外部性的存在及制造商治污投资动机不足要求政府对制造商的行为进行相应的规制,政府在制造商的治污投资行为中主要的作用是通过各种措施使得制造裔有动机地去自觉地进行有效的治污投资;政府的主要控制手段包括直接管制及借助市场激励,政府制定环境管理策略的关键因素是“惩罚的力度与激励的强度”。基于社会福利最大化的角度;从制造商的治污投资行为出发研究政府制定环境管理规制的策略,通过一个三阶段的博弈模型分析福利增进量、洽污成本与治污效果等三个因素对“惩罚力度与激励强度”的影响。 相似文献
3.
Mengwei Zhang Wanyue Liu Qian Qu Mingjing Ke Zhenyan Zhang Zhigao Zhou Tao Lu Haifeng Qian 《环境科学学报(英文版)》2020,32(11):102-109
An effective broad-spectrum fungicide, azoxystrobin (AZ), has been widely detected in aquatic ecosystems, potentially affecting the growth of aquatic microorganisms. In the present study, the eukaryotic alga Monoraphidium sp. and the cyanobacterium Pseudanabaena sp. were exposed to AZ for 7 days. Our results showed that 0.2–0.5 mg/L concentrations of AZ slightly inhibited the growth of Monoraphidium sp. but stimulated Pseudanabaena sp. growth. Meanwhile, AZ treatment effectively increased the secretion of total organic carbon (TOC) in the culture media of the two species, and this phenomenon was also found in a freshwater microcosm experiment (containing the natural microbial community). We attempted to assess the effect of AZ on the function of aquatic microbial communities through metabolomic analysis and further explore the potential risks of this compound. The metabonomic profiles of the microcosm indicated that the most varied metabolites after AZ treatment were related to the citrate cycle (TCA), fatty acid biosynthesis and purine metabolism. We thereby inferred that the microbial community increased extracellular secretions by adjusting metabolic pathways, which might be a stress response to reduce AZ toxicity. Our results provide an important theoretical basis for further study of fungicide stress responses in aquatic microcosm microbial communities, as well as a good start for further explorations of AZ detoxification mechanisms, which will be valuable for the evaluation of AZ environmental risk. 相似文献
4.
开发非粘土砖墙体建材应重视它们的隔声、抗震、放射性及隔热等性能是否符合技术标准,避免产生新的社会和环境问题。同时应严格技术考核,政府的倾斜政策也应合理、适度。 相似文献
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石化企业烟气脱硫技术选择和产业化建议 总被引:1,自引:0,他引:1
结合石化企业自备电厂锅炉的运行特点,分析当前各种脱硫工艺技术的适应性,提出发展循环镁法脱硫技术的必要性和迫切性,并对石化脱硫产业的健康发展提出建议。 相似文献
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Yasamis FD 《Environmental management》2006,38(5):823-836
Improving the performance of the state environmental agencies (SEAs) necessitates an effective institutionalization of governmental
environmental management functions. There are examples of successful and unsuccessful SEAs in several parts of the world.
Analysis and assessment of these cases can deliver useful insights for institution builders. The objective of this article
is the assessment of the institutional effectiveness of the SEAs in Turkey through the perceptions of the experts using the
Delphi Technique. In this regard, a checklist is developed including 16 criteria and 123 subcriteria to measure the institutional
effectiveness of the SEAs. Twenty-eight national and international experts have formed a Delphi panel and evaluated the national
and local conditions. Results, based on the perceptions of the experts, indicate that the overall effectiveness of the SEAs
is far less than satisfactory. Negative consensus has been reached over the effectiveness of 13 of the16 criteria and 95 of
the123 subcriteria; however, no consensus has been achieved over the remainder of the parameters. The survey has also proven
that the Delphi Technique can be effectively used for that purpose. Utilization of the checklist method is also useful in
diagnosing the problematic components of the SEAs. It is recommended that this approach be used in similar cases elsewhere. 相似文献
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10.
The forest hydrologic budget may be impacted by increasing CO2 and tropospheric O3. Efficient means to quantify such effects are beneficial. We hypothesized that changes in the balance of canopy interception, stem flow, and through-fall in the presence of elevated CO2 and O3 could be discerned using image analysis of leafless branches. We compared annual stem flow to the results of a computerized analysis of all branches from the 2002, 2004, and 2006 annual growth whorls of 97 ten-year-old trees from the Aspen Free-Air CO2 and O3 Enrichment (Aspen FACE) experiment in Rhinelander, WI. We found significant effects of elevated CO2 and O3 on some branch metrics, and that the branch metrics were useful for predicting stem flow from birch, but not aspen. The results of this study should contribute to development of techniques for efficient characterization of effects on the forest hydrologic budget of increasing CO2 and tropospheric O3. 相似文献