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241.
The required coefficient of friction (RCOF) is one of the critical elements in determining whether a slip incident might occur. Most researchers, when measuring RCOF, do not differentiate between the two feet of the same participant under the same walking condition. Results from a recent study (Chang et al., 2010) indicated that the stochastic distributions of the RCOF of both feet were different in 76% of the cases. Using the previous data (Chang et al., 2010), this paper presents a comparison of the RCOF for both feet of 50 participants under four level walking conditions resulting from two footwear types and two walking speeds using a t-test, commonly used by safety professionals to compare two pools of data. The current results indicated that 78% of the RCOF data showed a statistically significant difference between the RCOF from two feet for the same participant under each walking condition. The results of the logistic regression analysis used to identify factors that contributed to the outcome of the t-test indicated that the walking speed was the only factor with a statistical significance (p = 0.044). 相似文献
242.
Dian Ding Jia Xing Shuxiao Wang Xing Chang Jiming Hao 《Frontiers of Environmental Science & Engineering》2019,13(5):76
243.
Duan Xiaoyue Sui Xinyu Wang Qian Wang Weiyi Li Na Chang Limin 《Environmental science and pollution research international》2020,27(35):43656-43669
Environmental Science and Pollution Research - This study aims at investigating the electrocatalytic oxidation of sodium pentachlorophenate (PCP-Na) using a novel nano-PbO2 powder anode. The... 相似文献
244.
研究了石油降解过程中,土壤有效氮的动态变化,不同用氮水平在两种土壤上对石油降解速率的影响,以及石油降解的土壤水势条件。结果表明,石油对土壤的污染没有影响土壤水势;在土壤水势为-100~-20kPa范围内,水势的降低没有影响石油分解,而当土壤水势为-1000kPa时,石油降解速率与对照相比下降了10%~35%。在壤土上,肥料氮添加在碳(石油中碳)氮(肥料中氮)比为90时,石油降解最快;过多施用肥料氮会降低石油的分解速率。 相似文献
245.
利用^15N示踪技术研究了水培甜椒果实收获期间吸收的氮素在体内的动态分配规律。结果表明:甜椒果实收获期间营养器官与生殖器官干物质积累动态呈一平行的线性增长趋势,果实干物质积累量于始采期以后开始超过叶片,而果实氮素积累到盛采期才超过叶片,果实含氮量在整个采果期间保持稳定,随生长发育,叶片含氮迅速下降,盛采期时与果实和根相近,且均高于茎和侧枝,始采期通过根吸收的标记态氮主要贮存在叶片与果实中,叶片、果实是甜椒始采用氮素分配的最主要器官。此后,叶片和根成为主要的氮素输出器官,而果实则成为主要的输入器官。研究发现,甜椒体内的氮即使一度成为结合态,能能够被再度输出,但是,氮素在植株体内滞留的时间越长,越难以再度向外输出,并且不同器官输出的难易程度也是不相同的,比较而言,叶片和根中一度成为结合态的氮素容易被再交输出,甜椒果实是氮的强力库,氮素竞争力最强。 相似文献
246.
Whilst many studies of symbiotic dinoflagellate diversity have focused on tropical reef environments, only a few have explored the degree and pattern of divergence of these endosymbionts at high latitudes. In this study, the genetic diversity and specificity of symbiotic dinoflagellates associated with two common anthozoan hosts in the north-western Pacific Ocean was studied in four different seasons during a period of 1 year. Partial nucleotide sequences of 28S and complete ITS1 ribosomal DNA regions were used to identify, genetically, the endosymbionts extracted from the scleractinian Alveopora japonica and the actinarian Heteractis sp. A. japonica harbours symbionts belonging to Symbiodinium of clade F, while Heteractis sp. associates with Symbiodinium of clade C. Moreover, no seasonal changes in the endosymbiont community were detected in these two associations during this study. This is the first evidence that these two temperate cnidarian–microalgae symbioses are stable. Furthermore, we tested the apparent specificity of the Heteractis sp.– Symbiodinium sp. clade C association, by performing alga-infection experiments with aposymbiotic hosts, and monitoring the uptake and persistence of homologous and heterologous symbionts. The findings confirm the association patterns detected in the field and show that Heteractis sp. only establishes a successful association with Symbiodinium cells of clade C, at least among the heterologous symbionts occurring in the study area. Our results are consistent with the idea that selective pressures in highly fluctuating temperate environments might have granted symbiosis-specificity an adaptive value.Communicated by T. Ikeda, Hakodate 相似文献
247.
248.
A dense dinoflagellate bloom of Gyrodinium aureolum Hulburt in a shallow temperate zone estuary was monitored during the summers of 1982 and 1983. The bloom was typically extremely localized, its densest part exceeding 1000g chlorophyll a liter-1 (2x104 cells ml-1). The bloom began at temperatures between 24.5° and 27°C, existed at as high as 30°C and terminated when water temperature dropped to between 19° and 22°C. The highest specific growth rate measured was 0.90d-1 (1.3 divisions d-1) and near the termination of the bloom decreased to 0.28d-1 (0.4 divisions d-1). A diel vertical migration of the bloom was observed. A box model analysis, based on division rates, vertical migration and water circulation patterns, indicated that the bloom must move downward at the estuary mouth to maintain itself in the estuary, either by means of a convergence system or by downward swimming. High growth rate, low grazing pressure, and a stratified water column are proposed to stimulate bloom formation. Decreasing growth rate appeared to reduce the intensity of the bloom and finally allowed its disappearance by estuarine flushing and mixing.Communicated by J. M. Shick, Orono 相似文献
249.
Mechanisms of photoadaptation of photosynthesis have been studied in three strains of the symbiotic dinoflagellate Symbiodinium microadriaticum. Algal strains isolated from the clam Tridacna maxima, the sea anemone Aiptasia pulchella, and the scleractinian coral Montipora verrucosa were maintained in the defined medium ASP-8A, and were grown at irradiances ranging from 22 to 248 μE m-2 s-1 on a 14 h:10 h (light:dark) photoperiod at 26°C. All algal cultures were analysed during log-phase of growth. At all light levels, rates of cell division and photosynthesis were determined, as were cell volumes, pigmentation (including chlorophyll a, chlorophyll c 2, peridinin, β-carotene and xanthophylls), and carbon and nitrogen content. Low light-induced changes in pigmentation were evident to varying degrees in all three algal strains, although alterations in the photosynthesis-irradiance relations were distinctly different in each strain. The algae from T. maxima show the least photoadaptive capability, and seem to photoadapt by changing photosynthetic unit (PSU) size. Algae from A. pulchella appear to adapt by changing PSU number, while algae from M. verrucosa appear to photoadapt by changes in the activities of CO2-fixing enzymes or electron transport systems. These are the first observations that demonstrate functional differences in different strains of S. microadriaticum. The adaptive capabilities of the algae appear to correlate well with the ecological distribution of their respective hosts. The study was made from July 1981 through December 1982. 相似文献
250.
Kijune Sung Jaisoo Kim C.L. Munster M. Yavuz Corapcioglu Soyoung Park M.C. Drew Y.Y. Chang 《Ecological modelling》2006,190(3-4):277-286
Microorganisms make an important contribution to the degradation of contaminants in bioremediation as well as in phytoremediation. An accurate estimation of microbial concentrations in the soil would be valuable in predicting contaminant dissipation during various bioremediation processes. A simple modeling approach to quantify the microbial biomass in the rhizosphere was developed in this study. Experiments were conducted using field column lysimeters planted with Eastern gamagrass. The microbial biomass concentrations from the rhizosphere soil, bulk soil, and unplanted soil were monitored for six months using an incubation–fumigation method. The proposed model was applied to the field microbial biomass data and good correlation between simulated and experimental data was achieved. The results indicate that plants increase microbial concentrations in the soil by providing root exudates as growth substrates for microorganisms. Since plant roots are initially small and do not produce large quantities of exudates when first seeded, the addition of exogenous substrates may be needed to increase initial microbial concentrations at the start of phytoremediation projects. 相似文献