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141.
A. Siva Reddy G. C. Mishra K. Seetharamiah 《Journal of the American Water Resources Association》1972,8(1):55-62
Using Schwarz-Christoffel transformation, an analysis is presented for finding the pressure distribution and exit gradients for a weir on an anisotropic drained stratum. 相似文献
142.
Sreenath Reddy M Yadagiri Reddy P Rama Reddy K Eappen KP Ramachandran TV Mayya YS 《Journal of environmental radioactivity》2004,73(1):21-28
Thoron and its progeny concentration levels were measured in the urban Hyderabad area using solid state nuclear track detector (SSNTD) based dosimeters. Measurements were carried out on quarterly cycles making four measurements at each location in a calendar year. More than 100 dwellings of different construction types were chosen for the study across Hyderabad city. The thoron concentration levels were found to vary between 8 and 330 Bq m(-3). The geometric mean value of thoron concentration was found to be 37.3 Bq m(-3) (GSD = 2.3) with an average of 55 +/- 57 Bq m(-3). Results were analysed for different category of houses with respect to their construction type. It was found that the dwellings with mud flooring had higher thoron levels. 相似文献
143.
Sodium fluoride (NaF), a widespread natural pollutant was given to sperm-positive female rats throughout gestation and lactation
at a dose of 4.5 and 9.0 ppm via drinking water. The neonates were allowed to grow up to 90 days on tap water, and then sperm
parameters, testicular steroidogenic marker enzyme activity levels, and circulatory hormone levels were studied. The sperm
count, sperm motility, sperm coiling (hypoosmotic swelling test), and sperm viability were decreased in experimental rats
when compared with controls. The activity levels of testicular steroidogenic marker enzymes (3β hydroxysteroid dehydrogenase
and 17β hydroxysteroid dehydrogenase) were significantly decreased in experimental animals indicating decreased steroidogenesis.
The serum testosterone, follicle stimulating hormone and luteinizing hormone levels were also significantly altered in experimental
animals. Our data indicate that exposure to NaF during gestation and lactation affects male reproduction in adult rats by
decreasing spermatogenesis and steroidogenesis. 相似文献
144.
Balakrishnan Akash Appunni Sowmya Chinthala Mahendra Jacob Meenu Mariam Vo Dai-Viet N. Reddy Soreddy Sainath Kunnel Emmanuel Sebastian 《Environmental Chemistry Letters》2023,21(3):1881-1905
Environmental Chemistry Letters - Water contamination is increasing worldwide, yet actual methods of water and wastewater treatment are limited, in particular by actual fossil-fuel derived... 相似文献
145.
Madhavi D Devil KR Rao KK Reddy PP 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(1):115-117
The objective of the present study was to evaluate the protective effect of Phyllanthus emblica against clastogenicity induced by lead nitrate on the incidence of sperm head abnormalities in the germ cells of mice. At higher concentration of lead, a significant increase in the percentage of sperm head abnormalities was noted but when animals primed with Phyllanthus fruit extract (PFE), a reduction in the frequency of sperm head abnormalities was observed. It can be suggested from the above study that Phyllanthus emblica plays a key role in inhibition of heavy metal mutagenesis in mammals. 相似文献
146.
Al-Dawery Salam K. Ahmed Anwar Reddy Sajjala S. Al-Hadhrami Omaima Al-Lamki Kareema 《Environmental science and pollution research international》2020,27(10):10790-10801
Environmental Science and Pollution Research - Treatment of activated sludge using pure polyelectrolyte and its supernatant fluids for sludge dewatering was examined. The supernatant was used for... 相似文献
147.
Venkata Subba Reddy Gangireddygari Praveen Kumar Kalva Khayalethu Ntushelo Manjunatha Bangeppagari Arnaud Djami Tchatchou Rajasekhar Reddy Bontha 《Environmental Sciences Europe》2017,29(1):11
Background
The extensive and intensive uses of organophosphorus insecticide—quinalphos in agriculture, pose a health hazard to animals, humans, and environment because of its persistence in the soil and crops. However, there is no much information available on the biodegradation of quinalphos by the soil micro-organisms, which play a significant role in detoxifying pesticides in the environment; so research is initiated in biodegradation of quinalphos.Results
A soil bacterium strain, capable of utilizing quinalphos as its sole source of carbon and energy, was isolated from soil via the enrichment method on minimal salts medium (MSM). On the basis of morphological, biochemical and 16S rRNA gene sequence analysis, the bacterium was identified as to be Bacillus thuringiensis. Bacillus thuringiensis grew on quinalphos with a generation time of 28.38 min or 0.473 h in logarithmic phase. Maximum degradation of quinalphos was observed with an inoculum of 1.0 OD, an optimum pH (6.5–7.5), and an optimum temperature of 35–37 °C. Among the additional carbon and nitrogen sources, the carbon source—sodium acetate and nitrogen source—a yeast extract marginally improved the rate of degradation of quinalphos.Conclusions
Display of degradation of quinalphos by B. thuringiensis in liquid culture in the present study indicates the potential of the culture for decontamination of quinalphos in polluted environment sites.148.
Corstanje R Grunwald S Reddy KR Osborne TZ Newman S 《Journal of environmental quality》2006,35(3):938-949
Florida Everglades restoration plans are aimed at maintaining and restoring characteristic landscape features such as soil, vegetation, and hydrologic patterns. This study presents the results from an exhaustive spatial sampling of key soil properties in Water Conservation Area 1 (WCA 1), which is part of the northern Everglades. Three soil strata were sampled: floc, upper 0- to 10-cm soil layer, and 10- to 20-cm soil layer. A variety of properties were measured including bulk density (BD), loss on ignition (LOI), total phosphorus (TP), total inorganic phosphorus (TIP), total nitrogen (TN), total carbon (TC), total iron (TFe), total magnesium (TMg), total aluminum (TAl), and total calcium (TCa). Interpolated maps and model prediction uncertainties of properties were generated using geostatistical methods. We found that the uncertainty associated with spatial predictions of floc, particularly floc BD, was highest, whereas spatial predictions of soil chemical properties such as soil Ca were more accurate. The resultant spatial patterns for these soil properties identified three predominant features in WCA 1: (i) a north to south gradient in soil properties associated with the predominant hydrological gradient, (ii) areas of considerable soil nutrient enrichment along the western canal of WCA 1, and (iii) areas of considerable Fe enrichment along the eastern canal. By using geostatistical techniques we were able to describe the spatial dynamics of soil variables and express these predictions with an acceptable level of uncertainty. 相似文献
149.
Phosphorus (P) has been identified as the key constituent defining wetland productivity, structure, and function. Our goal was to investigate the spatial patterns of total P and three labile forms of P (labile organic, inorganic, and microbial biomass P) across a subtropical wetland located in east-central Florida, the Blue Cypress Marsh Conservation Area (BCMCA), and link spatial patterns to ecosystem processes. The wetland received a continual input of nutrients primarily from the south and intermittently from the west and east, respectively, which ceased in the mid-1990s. Since then the marsh system has been undergoing natural succession. We used (i) ordinary kriging to characterize the spatial patterns of total P and labile P forms across the wetland, (ii) local, moving spatial correlations to investigate relationships between total P and labile P forms, and (iii) a clustering technique to link the identified spatial patterns to biogeochemical processes. The spatially explicit analyses revealed patterns of total P and labile P forms as well as changing relationships between variables across the marsh. We were able to distinguish P-enriched areas from unaffected ("natural") areas and intermediate zones that are currently undergoing change as P is mobilized and translocated. We also identified areas that are at risk, showing a shift toward a more P-enriched status. Our results improve our understanding of P and its labile components within a spatially explicit context. 相似文献
150.
N. Y. Sreedhar M. Sankara Nayak K. N. Shashi Kumar K. Srinivasa Prasad P. Reddy Prasad 《Environmental monitoring and assessment》2010,170(1-4):59-63
A sensitive adsorptive stripping voltammetric method for the determination of simeton with universal buffer solution has been described. The method was based on the adsorption accumulation of simeton at a hanging mercury drop electrode. The overall reduction process is under controlled diffusion. The adsorptive peak was observed at ?0.8 V vs SCE in acidic solution 2 < pH < 6. The peak response was characterized with respect to pH, accumulation potential, time, and scan rate. The calibration plot was found to be linear from 1.13 × 10???5 to 3.5 × 10???8 M with a limit of detection of 2.0 × 10???8 M. Finally, the method has been applied for the determination of simeton in its formulations and vegetable samples. 相似文献