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71.
Private landowners play a pivotal role in determining whether or not rare species persist in regions where privately owned
land is extensive. The range of the gopher tortoise (Gopherus polyphemus) is confined to the Southeastern U.S., a region predominantly under private ownership, and thus the status of this species
is largely dependent upon land management decisions made by private landowners. We sent an anonymous mail survey to 2,584
individuals to examine factors affecting gopher tortoise occurrence on private lands in Mississippi (adjusted response rate
of 23%). Few respondents (19%) reported currently having tortoises on their property, although many had them in the past (30%).
Tortoises were persisting primarily on larger properties with longleaf pine that were not managed chiefly for timber production.
In general, respondents were largely unaware of habitat requirements of tortoises or effects of various land management practices
on them, and few reported using management techniques that benefit tortoises, such as prescribed burning. Most respondents
(57%) knew of wildlife incentive programs, but were hesitant to enroll because they did not want to commit to managing their
property in a particular manner (34%). We suggest actions that could improve the likelihood of tortoise persistence in this
region, as well as changes that could be made to incentive programs to increase landowner participation. These suggestions
should be relevant to the conservation of other rare species on private lands in other regions. 相似文献
72.
73.
Rebecca H. Mora Tamzen W. Macbeth Tara MacHarg Jagadish Gundarlahalli Holly Holbrook Paul Schiff 《补救:环境净化治理成本、技术与工艺杂志》2008,18(3):7-30
An in situ bioremediation (ISB) pilot study, using whey powder as an electron donor, is being performed at Site 19, Edwards Air Force Base, California, to treat groundwater contaminated with trichloroethene (TCE) via anaerobic reductive dechlorination. Challenging site features include a fractured granitic aquifer, complex geochemistry, and limited biological capacity for reductive dechlorination. ISB was conducted in two phases with Phase I including one‐and‐a‐half years of biostimulation only using whey powder and Phase II including biostimulation with buffered whey powder and bioaugmentation. Results of Phase I demonstrated effective distribution of whey during injections resulting in depletion of high concentrations of sulfate and methanogenesis, but acid production due to whey fermentation and limited buffering capacity of the aquifer resulted in undesirable impacts to pH. In addition, cis‐1,2‐dichloroethene (cis‐1,2‐DCE) stall was observed, which correlated to the unsuccessful growth of native Dehalococcoides populations. Therefore, Phase II included the successful buffering of whey powder using bicarbonate, which mitigated negative pH effects. In addition, bioaugmentation resulted in successful transport of Dehalococcoides populations to greater than 50 feet away from the injection point four months after inoculation. A concomitant depletion of accumulated cis‐1,2‐DCE was observed at all wells affected by bioaugmented Dehalococcoides. © 2008 Wiley Periodicals, Inc. 相似文献
74.
Zachary Douglas Cole Holly M. Donohoe Michael L. Stellefson 《Environmental management》2013,51(3):511-523
The interactive capacity of the Internet offers benefits that are intimately linked with contemporary research innovation in the natural resource and environmental studies domains. However, e-research methodologies, such as the e-Delphi technique, have yet to undergo critical review. This study advances methodological discourse on the e-Delphi technique by critically assessing an e-Delphi case study. The analysis suggests that the benefits of using e-Delphi are noteworthy but the authors acknowledge that researchers are likely to face challenges that could potentially compromise research validity and reliability. To ensure that these issues are sufficiently considered when planning and designing an e-Delphi, important facets of the technique are discussed and recommendations are offered to help the environmental researcher avoid potential pitfalls associated with coordinating e-Delphi research. 相似文献
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Craig Doremus Donald C. McNaught Phillip Cross Ted Fuist Edith Stanley Barbara Youngberg 《Environmental management》1978,2(3):245-248
Carbon cycling analysis is presented as a means for assessing anthropogenic perturbations in an ecosystem. Data from oligotrophic, eutrophic, and dystrophic (bog) lakes are used to show general trends in the lacustrine carbon cycle. The oligotrophic lake is an unstressed system and the eutrophic lake is under nutrient enrichment with high algal standing crops and productivity. The bog lake is a pH-stressed environment that is primarily a grazing ecosystem. It is hoped that a more effective environmental impact assessment will result from the use of carbon cycling as a unifying concept in ecosystem analysis. 相似文献
79.
A. Allen Bradley Forrest M. Holly William K. Walker Scott A. Wright 《Journal of the American Water Resources Association》1998,34(3):467-480
ABSTRACT: A continuous simulation approach is proposed for estimating water temperature exceedance probabilities using thermo-hydrodynamic modeling. The approach uses (1) a deterministic unsteady flow and heat transport model, (2) continuous hydrological and meteorological data for a long historical period, and (3) synthetic records of tributary water temperatures and other model inputs. Representative historical records of streamflow, air temperatures, and other hydrometeorological variables are obtained from nearby gages. Stochastic modeling methods are used to construct synthetic records for other model inputs, including inflow water temperatures. An application of this deterministic-stochastic approach is presented for a complex waterway in northeastern Illinois with heat discharges from several power plants and wastewater treatment plants. Statistical results from the continuous simulations are compared to results obtained from traditional event simulations. The application illustrates the information that engineers and biologists can obtain for (1) evaluating compliance with water temperature standards, and (2) assessing the effect of water temperatures on aquatic habitat. 相似文献
80.
Aishwarya Arjunan Holly Bellerose Raul Torres Rotem Ben-Shachar Jodi D. Hoffman Brad Angle Robert Nathan Slotnick Brittany N. Simpson Andrea M. Lewis Pilar L. Magoulas Kelly Bontempo Jeanine Schulze Jennifer Tarpinian Jessica A. Bucher Richard Dineen Allison Goetsch Gabriel A. Lazarin Katherine Johansen Taber 《黑龙江环境通报》2020,40(10):1246-1257