全文获取类型
收费全文 | 497篇 |
免费 | 7篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 4篇 |
环保管理 | 23篇 |
综合类 | 355篇 |
基础理论 | 65篇 |
污染及防治 | 38篇 |
评价与监测 | 4篇 |
社会与环境 | 6篇 |
出版年
2018年 | 6篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 21篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2009年 | 6篇 |
2008年 | 15篇 |
2007年 | 12篇 |
2006年 | 7篇 |
2005年 | 8篇 |
2004年 | 5篇 |
2003年 | 10篇 |
2002年 | 9篇 |
2000年 | 8篇 |
1999年 | 6篇 |
1997年 | 5篇 |
1994年 | 6篇 |
1986年 | 8篇 |
1979年 | 6篇 |
1975年 | 8篇 |
1964年 | 6篇 |
1963年 | 9篇 |
1962年 | 6篇 |
1961年 | 6篇 |
1960年 | 5篇 |
1959年 | 4篇 |
1958年 | 9篇 |
1957年 | 16篇 |
1956年 | 9篇 |
1955年 | 7篇 |
1954年 | 8篇 |
1943年 | 6篇 |
1940年 | 8篇 |
1939年 | 10篇 |
1937年 | 6篇 |
1936年 | 4篇 |
1935年 | 6篇 |
1934年 | 7篇 |
1933年 | 5篇 |
1932年 | 4篇 |
1931年 | 12篇 |
1930年 | 10篇 |
1927年 | 4篇 |
1925年 | 8篇 |
1924年 | 4篇 |
1923年 | 8篇 |
1922年 | 4篇 |
1921年 | 11篇 |
1920年 | 5篇 |
排序方式: 共有504条查询结果,搜索用时 578 毫秒
21.
22.
23.
24.
The significant processes controlling the fate of particulates are convection an dispersion on one hand, and sedimentation on the other hand. Due to inteparticulated reactions, larger aggregates can be formed from smaller units thus changing the sedimentation characteristics. These phenomena are summarized in a mathematical model whereby hydrodynamic effects as well as the control mechanisms of the dissolved phase are included. A relationship was derived on the basis of energy considerations leading to the formulation of a critical sedimentation velocity of the suspensa, which determines the transport capacity of the flowing system. The sedimentation term is calculated from the above discussed transport capacity, hydro-dynamic parameters and suspending media properties. Aggregation effects are taken into account as an increase of sedimentation velocities of the particles. The equations are solved in a particular computational routine such that the horizontal distribution of suspended solids in a natural system can be describe as function of the above discussed phenomena. The model was tested with in situ-measurements. It was found that the observed processes are described satisfactorily by this model. 相似文献
25.
Alfred Benninghoven Fritz Bindzius Detlef Braun Jutta Cramer Rolf Ellegast Udo Flowerday Andreas Genz Thomas von der Heyden Wolfgang Pfeiffer Dagmar Schittly Ralf Schweer Roger Stamm 《International journal of occupational safety and ergonomics》2005,11(4):409-421
Call centre workplaces are in many ways a challenge to occupational health and safety. The occupation itself can be described as an IT information technology-supported, communication-intensive form of work with often unusual working hours and a high rate of part-time employment. Data on the employee turnover as well as absenteeism related to occupational disability is quite contradictory. Occupational safety and its proponents still have to find new ways into the corporate structures and cultures of this relatively new and rapidly growing branch of industry. In a 2-year research and development project, using a holistic approach and under consideration of all the relevant disciplines, call centre workplaces were studied, and organisational measures were developed and field tested by putting them into practice. Practical help was developed for a sustainable strategy for successful and healthy work in call centres. 相似文献
26.
Comparison of leaching tests to determine and quantify the release of inorganic contaminants in demolition waste 总被引:1,自引:0,他引:1
The changes in waste management policy caused by the massive generation of waste materials (e.g. construction and demolition waste material, municipal waste incineration products) has led to an increase in the reuse and recycling of waste materials. For environmental risk assessment, test procedures are necessary to examine waste materials before they can be reused. In this article, results of column and lysimeter leaching tests having been applied to inorganic compounds in a reference demolition waste material are presented. The results show a good agreement between the leaching behaviour determined with the lysimeter unit and the column units used in the laboratory. In view of less time and system requirements compared to lysimeter systems, laboratory column units can be considered as a practicable instrument to assess the time-dependent release of inorganic compounds under conditions similar to those encountered in a natural environment. The high concentrations of elements in the seepage water at the initial stage of elution are reflected by the laboratory column leaching tests. In particular, authorities or laboratories might benefit and have an easy-to-use, but nevertheless reliable, method to serve as a basis for decision-making. 相似文献
27.
Ali Fanous Michael Hecker Angelika Görg Harun Parlar Fritz Jacob 《Journal of environmental science and health. Part. B》2013,48(7):666-675
Cobalt and silver are toxic for cells, but mechanisms of this toxicity are largely unknown. Analysis of Corynebacterium glutamicum proteome from cells grown in control and cobalt or silver enriched media was performed by two dimensional gel electrophoresis (2DE) followed by mass spectrometry. Our results indicate that the cell adapted to cobalt stress by inducing five defense mechanisms: Scavenging of free radicals, promotion of the generation of energy, reparation of DNA, reparation and biogenesis of Fe-S cluster proteins and supporting and reparation of cell wall. In response to the detoxification of Ag+ many proteins were up-regulated, which involved reparation of damaged DNA, minimizing the toxic effect of reactive oxygen species (ROS) and energy generation. Overexpression of proteins involved in cell wall biosynthesis (1,4-alpha-glucan branching enzyme and nucleoside-diphosphate-sugar epimerase) upon cobalt stress and induction of proteins involved in energy metabolism (2-methylcitrate dehydratase and 1, 2-methylcitrate synthase) upon silver demonstrate the potential of these enzymes as biomarkers of sub-lethal Ag+ and Co toxicity. 相似文献
28.
Jürgens N Schmiedel U Haarmeyer DH Dengler J Finckh M Goetze D Gröngröft A Hahn K Koulibaly A Luther-Mosebach J Muche G Oldeland J Petersen A Porembski S Rutherford MC Schmidt M Sinsin B Strohbach BJ Thiombiano A Wittig R Zizka G 《Environmental monitoring and assessment》2012,184(2):655-678
The international, interdisciplinary biodiversity research project BIOTA AFRICA initiated a standardized biodiversity monitoring network along climatic gradients across the African continent. Due to an identified lack of adequate monitoring designs, BIOTA AFRICA developed and implemented the standardized BIOTA Biodiversity Observatories, that meet the following criteria (a) enable long-term monitoring of biodiversity, potential driving factors, and relevant indicators with adequate spatial and temporal resolution, (b) facilitate comparability of data generated within different ecosystems, (c) allow integration of many disciplines, (d) allow spatial up-scaling, and (e) be applicable within a network approach. A BIOTA Observatory encompasses an area of 1?km2 and is subdivided into 100 1-ha plots. For meeting the needs of sampling of different organism groups, the hectare plot is again subdivided into standardized subplots, whose sizes follow a geometric series. To allow for different sampling intensities but at the same time to characterize the whole square kilometer, the number of hectare plots to be sampled depends on the requirements of the respective discipline. A hierarchical ranking of the hectare plots ensures that all disciplines monitor as many hectare plots jointly as possible. The BIOTA Observatory design assures repeated, multidisciplinary standardized inventories of biodiversity and its environmental drivers, including options for spatial up- and downscaling and different sampling intensities. BIOTA Observatories have been installed along climatic and landscape gradients in Morocco, West Africa, and southern Africa. In regions with varying land use, several BIOTA Observatories are situated close to each other to analyze management effects. 相似文献
29.
Predictive value of cardiovascular parameters in stages 1 and 2 of twin-to-twin transfusion syndrome
30.
Fritz Vollrath 《Behavioral ecology and sociobiology》1986,18(4):283-287
Summary Colonies of Anelosimus eximius in Panama had an average sex ratio of 0.15±sd 0.09, i.e. about five females for each male. The sex ratio in egg sacs reared was even lower (0.08±0.01), as was that of immatures in newly founded colonies (0.12±0.05). The possible mechanisms responsible are discussed. Mature colonies had an average ratio of 17 females and 2 males for each egg sac present (range: 2–91 females, 0.2–8.2 males) and contained a large proportion of females which were not inseminated but which presumably help. Since both sexes are diploid, arrhenotoky can be ruled out and it is assumed that some females do not come to reproduction, the proportion depending on the availability of resources. This mechanism may enable entire colonies to survive lean times. 相似文献