全文获取类型
收费全文 | 151篇 |
免费 | 0篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 10篇 |
环保管理 | 17篇 |
综合类 | 23篇 |
基础理论 | 28篇 |
污染及防治 | 59篇 |
评价与监测 | 8篇 |
社会与环境 | 3篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 7篇 |
2015年 | 1篇 |
2014年 | 8篇 |
2013年 | 17篇 |
2012年 | 8篇 |
2011年 | 7篇 |
2010年 | 4篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 6篇 |
2006年 | 9篇 |
2005年 | 8篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1965年 | 1篇 |
1963年 | 1篇 |
1961年 | 1篇 |
1959年 | 1篇 |
1954年 | 1篇 |
1953年 | 1篇 |
1923年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 15 毫秒
91.
Tore Sderqvist Hanna Nathaniel Daniel Franzn Frida Franzn Linus Hasselstrm Fredrik Grndahl Rajib Sinha Johanna Stadmark sa Strand Ida Ingmansson Sofia Lingegrd Jean-Baptiste Thomas 《Ambio》2022,51(5):1302
Harvesting beach-cast can help mitigate marine eutrophication by closing land-marine nutrient loops and provide a blue biomass raw material for the bioeconomy. Cost–benefit analysis was applied to harvest activities during 2009–2018 on the island of Gotland in the Baltic Sea, highlighting benefits such as nutrient removal from the marine system and improved recreational opportunities as well as costs of using inputs necessary for harvest. The results indicate that the activities entailed a net gain to society, lending substance to continued funding for harvests on Gotland and assessments of upscaling of harvest activities to other areas in Sweden and elsewhere. The lessons learnt from the considerable harvest experience on Gotland should be utilized for developing concrete guidelines for carrying out sustainable harvest practice, paying due attention to local conditions but also to what can be generalized to a wider national and international context.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01641-8. 相似文献
92.
Mechanical and Thermal Properties of Bamboo Microfibril Reinforced Polyhydroxybutyrate Biocomposites
R. Krishnaprasad N. R. Veena Hanna J. Maria Rathish Rajan Mikael Skrifvars Kuruvilla Joseph 《Journal of Polymers and the Environment》2009,17(2):109-114
In the present investigation, microfibrils were extracted from raw bamboo and characterized using scanning electron microscope.
Composites based on polyhydroxybutyrate (PHB) and bamboo microfibril were prepared with various microfibril loading. The mechanical
and thermal properties of the resulting composites were measured. Tensile strength and impact strength of the composites were
found to be increasing with increase in the loading of bamboo microfibrils, reached an optimum and thereafter decreased with
further increase in microfibril loading. Percentage crystallinity was found to be increasing with increase in fibril loading.
Thermal stability of the composite was higher than that of pure PHB. The composite could be developed further for various
structural applications. 相似文献
93.
Wenyu Huang Marcello Brigante Feng Wu Khalil Hanna Gilles Mailhot 《Environmental science and pollution research international》2013,20(1):39-50
The main disadvantage of using iron mineral in Fenton-like reactions is that the decomposition rate of organic contaminants is slower than in classic Fenton reaction using ferrous ions at acidic pH. In order to overcome these drawbacks of the Fenton process, chelating agents have been used in the investigation of Fenton heterogeneous reaction with some Fe-bearing minerals. In this work, the effect of new iron complexing agent, ethylenediamine-N,N'-disuccinic acid (EDDS), on heterogeneous Fenton and photo-Fenton system using goethite as an iron source was tested at circumneutral pH. Batch experiments including adsorption of EDDS and bisphenol A (BPA) on goethite, H2O2 decomposition, dissolved iron measurement, and BPA degradation were conducted. The effects of pH, H2O2 concentration, EDDS concentration, and goethite dose were studied, and the production of hydroxyl radical (?OH) was detected. The addition of EDDS inhibited the heterogeneous Fenton degradation of BPA but also the formation of ?OH. The presence of EDDS decreases the reactivity of goethite toward H2O2 because EDDS adsorbs strongly onto the goethite surface and alters catalytic sites. However, the addition of EDDS can improve the heterogeneous photo-Fenton degradation of BPA through the propagation into homogeneous reaction and formation of photochemically efficient Fe-EDDS complex. The overall effect of EDDS is dependent on the H2O2 and EDDS concentrations and pH value. The high performance observed at pH 6.2 could be explained by the ability of O 2 ?? to generate Fe(II) species from Fe(III) reduction. Low concentrations of H2O2 (0.1 mM) and EDDS (0.1 mM) were required as optimal conditions for complete BPA removal. These findings regarding the capability of EDDS/goethite system to promote heterogeneous photo-Fenton oxidation have important practical implications for water treatment technologies. 相似文献
94.
Silvennoinen H Hietanen S Liikanen A Stange CF Russow R Kuparinen J Martikainen PJ 《Ambio》2007,36(2-3):134-140
Estuaries have been suggested to have an important role in reducing the nitrogen load transported to the sea. We measured denitrification rates in six estuaries of the northern Baltic Sea. Four of them were river mouths in the Bothnian Bay (northern Gulf of Bothnia), and two were estuary bays, one in the Archipelago Sea (southern Gulf of Bothnia) and the other in the Gulf of Finland. Denitrification rates in the four river mouths varied between 330 and 905 micromol N m(-2) d(-1). The estuary bays at the Archipelago Sea and the Gulf of Bothnia had denitrification rates from 90 micromol N m(-2) d(-1) to 910 micromol N m(-2) d(-1) and from 230 micromol N m(-2) d(-1) to 320 micromol N m(-2) d(-1), respectively. Denitrification removed 3.6-9.0% of the total nitrogen loading in the river mouths and in the estuary bay in the Gulf of Finland, where the residence times were short. In the estuary bay with a long residence time, in the Archipelago Sea, up to 4.5% of nitrate loading and 19% of nitrogen loading were removed before entering the sea. According to our results, the sediments of the fast-flowing rivers and the estuary areas with short residence times have a limited capacity to reduce the nitrogen load to the Baltic Sea. 相似文献
95.
We investigated the utility of three polymerase chain-reaction (PCR)-based DNA molecular markers in analysing genetic structure
of the populations of the blacklip abalone Haliotis rubra (Leach) of Victoria, Australia. The DNA markers included 84 randomly amplified polymorphic DNA (RAPD) bands amplified using
six random primers, two minisatellites, GHR (putative growth-hormone-gene-repeat) and MIPR (putative mollusca-insulin-like
peptide-gene-repeat), and three microsatellites, RUBGT1 [containing (GT)n repeats], RUBCA1 [containing (CA)n repeats] and RUBGACA1 [containing (GACA)n repeats]. All three types of DNA markers revealed significant subdivision in the H. rubra populations along the coastline. This is postulated as being related to the abalone's relatively short pelagic period and
limited dispersion. Further analysis revealed that a Point Cook population sampled from within the semi-enclosed Port Phillip
Bay was distinct from two other central zone populations (Apollo Bay and Cape Schanck). The genotypes of microsatellites indicated
excessive homozygotes across all the populations at all three microsatellite loci, and possible causes such as larval recruitment
pattern and asynchronous spawning are discussed. The excessive homozygotes recorded for the three microsatellite loci contrast
with those observed in the minisatellite loci GHR and MIPR, the heterozygosities of which were at Hardy–Weinberg equilibrium.
Received: 17 March 1999 / Accepted: 24 November 1999 相似文献
96.
Analyzing or explaining beta diversity? Understanding the targets of different methods of analysis 总被引:1,自引:0,他引:1
It has been actively discussed recently what statistical methods are appropriate when one is interested in testing hypotheses about the origin of beta diversity, especially whether one should use the raw-data approach (e.g., canonical analysis such as RDA and CCA) or the distance approach (e.g., Mantel test and multiple regression on distance matrices). Most of the confusion seems to stem from uncertainty as to what is the response variable in the different approaches. Here our aim is to clarify this issue. We also show that, although both the raw-data approach and the distance approach can often be used to address the same ecological hypothesis, they target fundamentally different predictions of those hypotheses. As the two approaches shed light on different aspects of the ecological hypotheses, they should be viewed as complementary rather than alternative ways of analyzing data. However, in some cases only one of the approaches may be appropriate. We argue that S. P. Hubbell's neutral theory can only be tested using the distance approach, because its testable predictions are stated in terms of distances, not in terms of raw data. In all cases, the decision on which method is chosen must be based on which addresses the question at hand, it cannot be based on which provides the highest proportion of explained variance in simulation studies. 相似文献
97.
98.
Peitzmeier Christian Loschke Carmen Wiedenhaus Hanna Klemm Otto 《Environmental science and pollution research international》2017,24(29):23279-23289
Environmental Science and Pollution Research - We conducted a 60-day roadside measurement campaign on a busy street in Münster, Germany, during summer 2016. We used gas and particle... 相似文献
99.
100.
Timothy M. Gilmore Thomas R. Hanna 《Journal of the Air & Waste Management Association (1995)》2013,63(11):1077-1079
A method employing the timed fill of Mylar bags was used to obtain average carbon monoxide concentration values for ten locations in the Fairbanks, Alaska, area. The method is shown to be accurate, reliable, and inexpensive. The correlation coefficient between the bag sampling method and a continuous carbon monoxide analyzer was 0.945; correlation of carbon monoxide data from several locations to a reference in downtown Fairbanks showed a general decrease with distance from the reference analyzer. Analysis of data from Fairbanks shows that carbon monoxide concentrations during the winter months may have to be reduced 50-75% to achieve the State and National Ambient Air Quality Standards; the high levels of carbon monoxide are the result of emissions from automobile traffic during periods of severe inversion in the Fairbanks basin. 相似文献