全文获取类型
收费全文 | 153篇 |
免费 | 1篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 6篇 |
环保管理 | 11篇 |
综合类 | 90篇 |
基础理论 | 14篇 |
污染及防治 | 19篇 |
评价与监测 | 3篇 |
社会与环境 | 8篇 |
灾害及防治 | 1篇 |
出版年
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2010年 | 6篇 |
2009年 | 7篇 |
2008年 | 6篇 |
2007年 | 4篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 6篇 |
2001年 | 3篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1964年 | 1篇 |
1959年 | 1篇 |
1957年 | 2篇 |
1956年 | 2篇 |
1955年 | 4篇 |
1951年 | 3篇 |
1947年 | 1篇 |
1946年 | 1篇 |
1943年 | 3篇 |
1942年 | 1篇 |
1941年 | 2篇 |
1938年 | 3篇 |
1936年 | 3篇 |
1935年 | 1篇 |
1934年 | 6篇 |
1933年 | 5篇 |
1932年 | 3篇 |
1931年 | 2篇 |
1930年 | 3篇 |
1929年 | 2篇 |
1927年 | 4篇 |
1926年 | 4篇 |
1925年 | 2篇 |
1924年 | 4篇 |
1923年 | 2篇 |
1922年 | 2篇 |
1916年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 17 毫秒
81.
Terje Laskemoen Tomas Albrecht Andrea Bonisoli-Alquati Jaroslav Cepak Florentino de Lope Ignacio G. Hermosell Lars Erik Johannessen Oddmund Kleven Alfonso Marzal Timothy A. Mousseau Anders P. Møller Raleigh J. Robertson Geir Rudolfsen Nicola Saino Yoni Vortman Jan T. Lifjeld 《Behavioral ecology and sociobiology》2013,67(2):301-309
Spermatozoa vary greatly in size and shape among species across the animal kingdom. Postcopulatory sexual selection is thought to be the major evolutionary force driving this diversity. In contrast, less is known about how sperm size varies among populations of the same species. Here, we investigate geographic variation in sperm size in barn swallows Hirundo rustica, a socially monogamous passerine with a wide Holarctic breeding distribution. We included samples from seven populations and three subspecies: five populations of ssp. rustica in Europe (Czech, Italy, Norway, Spain, and Ukraine), one population of ssp. transitiva in Israel, and one population of ssp. erythrogaster in Canada. All sperm traits (head length, midpiece length, tail length, and total length) varied significantly among populations. The variation among the European rustica populations was much lower than the differences among subspecies, indicating that sperm traits reflect phylogenetic distance. We also performed a test of the relationship between the coefficient of between-male variation in total sperm length and extrapair paternity levels across different populations within a species. Recent studies have found a strong negative relationship between sperm size variation and extrapair paternity among species. Here, we show a similar negative relationship among six barn swallow populations, which suggests that the variance in male sperm length in a population is shaped by the strength of stabilizing postcopulatory sexual selection. 相似文献
82.
M. Albrecht K. M. Kneeland E. Lindroth J. E. Foster 《Journal of Coastal Conservation》2013,17(3):483-491
Rhizophora mangle L. is a widespread mangrove species in the Western Hemisphere. Mangrove habitat loss and their importance to coastal and reef ecosystems make greater understanding of their genetic structure useful for conservation and management. An amplified fragment polymorphism (AFLP) analysis was performed on samples from Florida and the Caribbean to discover the genetic structure present. R. mangle had variable genetic diversity not related to latitude; P ranged 7 %–92 %. Some other factor, perhaps human impact, has caused low genetic diversity in some populations. Across Florida R. mangle populations varied in genetic diversity with less diversity (Gst?=?0.195) and greater gene flow on the Atlantic coast (Nm =2.07) than on the Gulf coast (Gst?=?0.717, Nm?=?0.197). Gene flow between Caribbean islands was low (Nm?=?0.386) compared to continental populations (Nm?=?1.40), indicating that long distance dispersal is not common between islands. Analysis of molecular variance (AMOVA) analysis showed significant deviations from Hardy-Weinberg expectations at the level of region among subpopulations and overall genetic difference among subpopulations for R. mangle. One implication for management is that small continental populations and island populations may be genetically isolated and distinct from each other. 相似文献
83.
Virmond E De Sena RF Albrecht W Althoff CA Moreira RF José HJ 《Waste management (New York, N.Y.)》2012,32(10):1952-1961
In the present work, selected agroindustrial solid residues from Brazil – biosolids from meat processing wastewater treatment and mixture of sawdust with these biosolids; residues from apple and orange juice industries; sugarcane bagasse; açaí kernels (Euterpe oleracea) and rice husk – were characterised as solid fuels and an evaluation of their properties, including proximate and ultimate composition, energy content, thermal behaviour, composition and fusibility of the ashes was performed. The lower heating value of the biomasses ranged from 14.31 MJ kg?1 to 29.14 MJ kg?1, on a dry and ash free basis (daf), all presenting high volatile matter content, varying between 70.57 wt.% and 85.36 wt.% (daf) what improves the thermochemical conversion of the solids. The fouling and slagging tendency of the ashes was predicted based on the fuel ash composition and on the ash fusibility correlations proposed in the literature, which is important to the project and operation of biomass conversion systems. The potential for application of the Brazilian agroindustrial solid residues studied as alternative energy sources in thermochemical processes has been identified, especially concerning direct combustion for steam generation. 相似文献
84.
Tillage, crop rotation, and organic amendment effect on changes in soil organic matter 总被引:5,自引:0,他引:5
Rickman R Douglas C Albrecht S Berc J 《Environmental pollution (Barking, Essex : 1987)》2002,116(3):405-411
Carbon sequestration in agricultural soils is controlled by the balance of added organic residues and microbial oxidation of both residues and native organic matter (OM) as moderated by management and tillage. The PC-based model CQESTR predicts decomposition of residues, organic amendments and soil OM, based on cropping practices. CQESTR uses RUSLE (Revised Universal Soil Loss Equation) crop rotation and management practice, crop production, and operation databases. These data are supplemented with residue nitrogen and soil OM, bulk density, and layer thickness. CQESTR was calibrated with soil carbon data from 70-year-long experiments at the Research Center at Pendleton, OR. The calibrated model provides estimates with a 95% confidence interval of 0.33% OM. Validation at 11 independent sites resulted in a matching of observed with calculated OM with a 95% confidence interval of 0.55% OM. A 12th site, with a history of severe erosion, provided a poor match. 相似文献
85.
Ohbayashi H Hosomi M Kanbe H Melber A Bruckamp J 《Waste management (New York, N.Y.)》2002,22(1):91-98
This paper describes a new vacuum thermal recycling (VTR) method for treating discarded polychlorinated biphenyls (PCB)-contaminated capacitors and pressure-sensitive paper. Based on results demonstrating an exceptionally high PCB separation efficiency and recovery ratio from capacitors containing high-concentration PCBs, i.e. > 99.9%, respectively, the presented VTR method is verified to effectively remove PCBs. In addition, associated safety aspects of the employed procedure were confirmed. 相似文献
86.
87.
88.
Carsten Albrecht Brühl Bernd Guckenmus Markus Ebeling Ralf Barfknecht 《Environmental science and pollution research international》2011,18(1):31-37
Background, aim and scope
Seed treatments are widely used on cereals and other annual crops throughout Europe. Most of the formulated pesticide is found on the outside of the seed, the husk. Risk assessments of seed treatments are especially needed for granivorous mice living in the agricultural landscape e.g. for registration using the guidance for risk assessment for birds and mammals (EFSA 2009). The dehusking of seeds before consumption is a known behaviour of these mammals, but so far, no quantitative data on the reduction of exposure of seed treatments by dehusking were published. Therefore, we aimed at providing a first quantitative estimate of this behaviour-related exposure reduction for the wood mouse (Apodemus sylvaticus) with different seed types. 相似文献89.
Ulla Raab Michael Albrecht Ursula Preiss Wolfgang Völkel Ursula Schwegler Hermann Fromme 《Chemosphere》2013
The aim of the Bavarian Monitoring of Breast Milk (BAMBI) project was to examine 10 organochlorine pesticides (OPs), 3 nitro musks, 6 indicator polychlorinated biphenyls (PCBs), 7 polychlorinated dibenzo-p-dioxins (PCDDs), 10 polychlorinated dibenzofurans (PCDFs), 12 dioxin-like PCBs (dl-PCBs) and several perfluorinated alkyl compounds in breast milk samples. A total of 516 breast milk samples were collected from seven regions in Bavaria and were analyzed by means of GC/ECD, GC/HRMS, and LC/MS-MS. 相似文献
90.
Stefan Gartiser Christoph Hafner Christoph Hercher Kerstin Kronenberger-Schäfer Albrecht Paschke 《Environmental science and pollution research international》2010,17(5):1149-1157