Filters: Tags: life cycle (X)525 results (291ms)
Life strategy and phosphorus relations of the cyanobacterium Gloeotrichia echinulata in an oligotrophic Precambrian Shield lake.
Convergent colonial organization and reproductive function in two bryozoan species epizoic on gastropod shells
Life cycle and biological control of the Eucalyptus snout beetle (Coleoptera, Curculionidae) by Anaphes nitens (Hymenoptera, Mymaridae) in north-west Spain
Potential effects of human activities on billfishes (Istiophoridae and Xiphiidae) in the western Atlantic Ocean
Using a streamlined life-cycle analysis matrix to structure a design for the environment program for a complex defense system
Production and life cycle of the gastropod Hydrobia truncata , with notes on Spurwinkia salsa in Massachusetts salt marsh pools.
Laboratory rearing of Lycaeides melissa samuelis (Lepidoptera: Lycaenidae), an endangered butterfly in Michigan
South Swedish rove beetles (Coleoptera: Staphylinidae) from a conservation point of view: 1. Quedius truncicola.
Post-settlement Life Cycle Migration Patterns and Habitat Preference of Coral Reef Fish That Use Seagrass and Mangrove Habitats as Nurseries
Life cycle studies on the introduced spider crab Pyromaia tuberculata (Lockington) (Brachyura: Majidae). II. Crab stage and reproduction
The future challenges for “clean coal technologies”: Joining efficiency increase and pollutant emission control
There are unconventional fuels that may serve as near term major replacements for conventional mineral oil and natural gas. These include fuels from oil shale and bitumen, liquid fuels from coal, methane from methane hydrates, biofuels and the secondary fuel hydrogen. Here, these fuels will be reviewed as to their presumable stocks and life cycle wastes, emissions and inputs of natural resources. The unconventional fuels are usually characterized by a relatively poor source-to-burner energy efficiency when compared with current conventional mineral oil and gas. Apart from some varieties of hydrogen and biofuel, their life cycles are characterized by relatively large water inputs, emissions, and wastes. The unconventional...
The greenhouse gas regional inventory project (GRIP): Designing and employing a regional greenhouse gas measurement tool for stakeholder use
Governmental policy options in response to increasing concern over an emerging greenhouse warming are reviewed. These will reflect differing levels of pofitical concem as understanding on the future size and impacts of the greenhouse effect evolves. High levels of concem will place emphasis on the option of limiting C02 emissions by restricting fossil fuel use. This option requires emphasis on energy efficiency and changes in energy supply, with increased use of natural gas, nuclear power or renewable energy sources. The progressive industrialization of the LDCs with the consequent growth in energy demand, may put additional pressure on developed countries to take action on this policy option.
Multi-objective design optimization of a natural gas-combined cycle with carbon dioxide capture in a life cycle perspective
Environmental monitoring has been an ongoing activity on the U.S. Department of Energy's Hanford Site in southeastern Washington for almost 50 years. Objectives are to detect and assess potential impacts of Site operations on air, surface and ground waters, foodstuffs, fish, wildlife, soil and vegetation. Data from monitoring effects are used to calculate the overall radiological dose to humans working onsite or residing in nearby communities. In 1989, measured Hanford Site perimeter concentrations of airborne radionuclides were below applicable guidelines. Concentrations of radionuclides and nonradiological water quality in the Columbia River were in compliance with applicable standards. Foodstuffs irrigated with...
Issues related to energy saving and pollution reduction are closely related. Their importance has increased in recent years and presents considerable academic and industrial challenges. They generally represent complex tasks of a considerable scale and comprehensive interactions. The methodology and concepts of Process Integration have been developing over last thirty years  and have been considerably expended to tackle these problems . International conferences provide a good opportunity to review the state-of-the-art in this field. One of the most established and well known conference is PRES. The 13th Conference on “Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction...
Simulation-based life cycle assessment of energy efficiency of biomass-based ethanol fuel from different feedstocks in China
This study proposes a new use of Data Envelopment Analysis (DEA) to measure the operational, environmental and both-unified efficiency measures of US coal-fired power plants. The power plants produce not only desirable outputs (e.g., electricity) but also undesirable outputs (e.g., CO2 and NOx) as a result of their plant operations. A Range-Adjusted Measure (RAM) is used as an original non-radial DEA model. Then, it is reformulated for handling undesirable (bad) outputs. The proposed use of DEA models measures the environmental and unified performance of power plants under two variable alternatives (with and without CO2 emission control) in order to examine both the influence of US Clean Air Act (CAA) on the acid...