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371.
Arthur Hoole 《Journal of Environmental Planning and Management》1995,38(4):505-518
For the past two decades, planners and researchers have struggled to define concepts of sustainable development, but most definitions are too general. Goals need to be more specific and will vary to reflect the different conditions and national development policies across countries. A national Delphi survey, using two sequential questionnaires, was conducted in Zimbabwe during late 1992 with a broad cross-section of stakeholders. The survey identified, clarified and ranked 34 national objectives for environmentally sustainable development in Zimbabwe. Survey respondents weighted environmental objectives in development planning higher than both economic and social objectives. The ranked objectives will help guide the country's efforts to implement environmentally sustainable development and associated policy measures. 相似文献
372.
Reza M. Khanbilvardi Andrew S. Rogowski Arthur C. Miller 《Journal of the American Water Resources Association》1983,19(1):29-35
ABSTRACT: We have developed a computer model of soil loss on an upland watershed from the continuity considerations for sediment transport and from equations describing rill and interrill erosion. The model is based on dividing the upland area into a grid containing rill and interill zones, on the Universal Soil Loss Equation (USLE), and on equations describing detachment and transport capacity of rill flow. The USLE estimates the sediment load from the contributing areas. The location and amount of total erosion and deposition are determined by comparing the transport and detachment capacity of rill flow for specific storms. The model considers the mechanics of erosion process and can serve as basis for reservoir and channel design and land use planning. 相似文献
373.
ABSTRACT: As part of the Gulf Coast Regional Aquifer System Analysis (GC RASA) study, data from 184 geophysical well logs were used to define the geohydrologic framework of the Mississippi embayment aquifer system in Mississippi for flow model simulation. Five major aquifers of Eocene and Paleocene age were defined within this aquifer system in Mississippi. A computer data storage system was established to assimilate the information obtained from the geophysical logs. Computer programs were developed to manipulate the data to construct geologic sections and structure maps. Data from the storage system will be input to a five-layer, three-dimensional, finite-difference digital computer model that is used to simulate the flow dynamics in the five major aquifers of the Mississippi embayment aquifer system. 相似文献
374.
375.
Arthur M. Stern 《Environmental management》1986,10(4):445-452
Summary Economic incentives have spurred numerous applications of genetically engineered organisms in manufacture of pharmaceuticals and industrial chemicals. These successes, involving a variety of methods of genetic manipulation, have dispelled early fears that genetic engineering could not be handled safely, even in the laboratory. Consequently, the potential for applications in the wider environment without physical containment is being considered for agriculture, mining, pollution control, and pest control. These proposed applications range from modest extensions of current plant breeding techniques for new disease-resistant species to radical combinations of organisms (for example, nitrogen-fixing corn plants). These applications raise concerns about potential ecological impacts (see chapter 5), largely because of adverse experiences with both deliberate and inadvertent introductions of nonindigenous species. 相似文献
376.
Arthur M. Stern 《Environmental management》1986,10(4):453-462
Summary At this time, there is no US legislation that is specifically aimed at regulating the environmental release of genetically engineered organisms or their modified components, either during the research and development stage or during application. There are some statutes, administered by several federal agencies, whose language is broad enough to allow the extension of intended coverage to include certain aspects of biotechnology. The one possible exception is FIFRA, which has already brought about the registration of several natural microbial pesticides but which also has provision for requiring the registration of strain improved microbial pesticides. Nevertheless, there may be gaps in coverage even if all pertinent statutes were to be actively applied to the control of environmental release of genetically modified substances. The decision to regulate biotechnology under TSCA was justified, in part, on the basis of its intended role as a gap-filling piece of environmental legislation. The advantage of regulating biotechnology under TSCA is that this statute, unlike others, is concerned with all media of exposure (air, water, soil, sediment, biota) that may pose health and environmental hazards. Experience may show that extending existing legislation to regulate biotechnology is a poor compromise compared to the promulgation of new legislation specifically designed for this purpose. It appears that many other countries are ultimately going to take the latter course to regulate biotechnology. 相似文献
377.
Christopher Bone Suzana Dragićević Arthur Roberts 《Environmental Modeling and Assessment》2007,12(2):105-118
The objective of this study was to develop an integrated geographic information system (GIS) cellular automata (CA) model
for simulating insect-induced tree mortality patterns in order to evaluate the influence of different forest management activities
to control insect outbreaks. High-resolution multispectral images were used to determine susceptibility of trees to attack,
whereas the GIS-based CA model simulated the effectiveness of clear-cuts and thinning practices for reducing insect-induced
tree mortality. The results indicate that thinning susceptible forests should be more effective than clear-cutting for reducing
tree loss to insect outbreaks. This study demonstrates the benefits of an integrated approach for understanding and evaluating
forest management activities and expresses the need for spatial analysis and modeling for improving forest management practices. 相似文献
378.
Arthur Haas 《Die Naturwissenschaften》1937,25(45):733-734
379.
The Science of Nature - 相似文献
380.
Amy M. Breman Jennifer C. Chow Lance U'Ren Elizabeth A. Normand Sadeem Qdaisat Li Zhao David M. Henke Rui Chen Chad A. Shaw Laird Jackson Yaping Yang Liesbeth Vossaert Rachel H. V. Needham Elizabeth J. Chang Daniel Campton Jeffrey L. Werbin Ron C. Seubert Ignatia B. Van den Veyver Jackie L. Stilwell Eric P. Kaldjian Arthur L. Beaudet 《黑龙江环境通报》2016,36(11):1009-1019