排序方式: 共有65条查询结果,搜索用时 15 毫秒
51.
52.
53.
Austal 2000应用于国内“烟塔合一”类项目大气影响评价 总被引:2,自引:0,他引:2
简述了德国"烟塔合一"类大气污染扩散模式,以及相关模式Austal 2000的应用方法,修正了气象参数以适合本地化应用。以天津某电厂为实例,将Austal 2000模式"烟塔合一"和烟囱排烟方式的计算结果进行了对比分析。结果表明,在进行本地化修改后,Austal 2000模式适用于国内有关项目大气预测评价,但从环境影响角度考虑,"烟塔合一"相对于高烟囱排放方式没有明显优势,应用时需慎重。 相似文献
54.
55.
We assessed the blue mussel Mytilus edulis fishery management scheme introduced in 1994 in the Danish Wadden Sea that regulate fishing vessels, fishery quota, set-aside
for mussel-eating birds and established zones closed to mussel fishery. The results showed (i) a reduction in the blue mussel
biomass and mussel bed areas in zones closed to fishery, (ii) decrease in eiders Somateria mollissima numbers and increase or stable numbers for oystercatcher Haematopus ostralegus and herring gull Larus argentatus and (iii) that energy estimations based on ecological food requirements for the mussel-eating birds should be at least three
times larger, than the amount set-aside in the mussel management scheme. It is concluded that the mussel management scheme
had been unable to stabilize or increase the blue mussel stocks and to secure stable or increasing numbers for all target
bird species. Thus, it is recommended to revise the present blue mussel management scheme in the Danish Wadden Sea, to continue
and improve mussel stock and bird surveys, and to consider novel studies of the mussel-eating birds’ energetics for improved
set-aside estimates and future assessments. 相似文献
56.
European forest policymaking is shaped by progressing European integration, yet with notable ideological divisions and diverging interests among countries. This paper focuses on the coalitional politics of key environmental forest issues: biodiversity conservation, timber legality, and climate protection policy. Combining the Advocacy Coalition Framework and the Shifting Coalition Theory, and informed by more than 186 key informant interviews and 73 policy documents spanning a 20-year timeframe, we examine the evolution of coalitional forest politics in Europe. We find that the basic line-up has remained stable: an environmental coalition supporting EU environmental forest policy integration and a forest sector coalition mostly opposing it. Still, strategic alliances across these coalitions have occurred for specific policy issues which have resulted in a gradual establishment of an EU environmental forest policy. We conclude with discussion of our findings and provide suggestions for further research.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01644-5. 相似文献
57.
介绍了EXCEL2000运用规划求解解决环境保护中出现的多约束条件、多变量问题的方法。 相似文献
58.
主要介绍了CAXA电子图板和AutoCAD2 0 0 0在电刷端盖压铸模设计中的使用方法 ,论述了电刷端盖压铸模设计中涉及的压铸机选择 ,分型面选择和浇注系统的设计等技术问题。 相似文献
59.
利用Excel2000电子数据表格软件提供的线性规划对畜禽的饲料配方寻求最优解,具有科学、运算速度快、增减原料随意和数据修改容易等优点,可以省去手工计算饲料配方的繁琐,与研制出来的专家系统饲料配方软件及相关计算机设计饲料配方的程序相比,该方法无须要求使用者首先购买这些软件和程序,只要用户购买电脑并安装上Excel7000电子数据表格软件后即可运用线性规划设计饲料配方。 相似文献
60.