全文获取类型
收费全文 | 54篇 |
免费 | 0篇 |
国内免费 | 9篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 12篇 |
环保管理 | 5篇 |
综合类 | 13篇 |
基础理论 | 10篇 |
污染及防治 | 17篇 |
评价与监测 | 1篇 |
社会与环境 | 4篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2018年 | 1篇 |
2014年 | 1篇 |
2013年 | 3篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 4篇 |
2009年 | 1篇 |
2008年 | 3篇 |
2007年 | 8篇 |
2006年 | 7篇 |
2005年 | 3篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 4篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1992年 | 1篇 |
1982年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有63条查询结果,搜索用时 15 毫秒
1.
Youssouf Boundou Sylla Masao Kuroda Masayuki Yamada Naoko Matsumoto 《Waste management & research》2006,24(5):456-464
Pilot-scale composting was carried out with cow manure to evaluate the performances of two passive aeration systems: a conventional passive aeration system equipped with horizontal pipes and an unusual passive aeration method based on air delivery by means of vertical pipes. The effects of both types of passive aeration apparatus were investigated in order to determine the degree of composting rate by continuously monitoring temperature, moisture content, organic matter, electrical conductivity, pH and C/N ratio in the piles. Temperatures in the range of thermophily (55-65 degrees C) were reached in all runs within 1-2 days then lasting for about 1 week, a span long enough for pathogen abatement. Results suggest that passive aeration carried out by vertical pipes is more effective for air delivery into compost piles than conventional passive aeration of air adduction with horizontal pipes. The variation in the number of vertical pipes was revealed to be an important parameter for the control of composting rate and temperature. Composting rates estimated from the heat balance equation were substantially in agreement with those computed through the conversion ratio of total organic matter decrement. The conversion ratios and composting rates obtained in this study using passive aeration with vertical pipes were well aligned with those found using forced air delivery systems. 相似文献
2.
在前文的基础上,进一步研究了更常用的在限制最高和同时限制平均与最高出水有机物浓度两种排放标准的约束条件下,使其运行费用最省的最优周期控制问题.计算结果都表明,最优控制变量QW和DO的变化规律都尽可能使其满足约束条件和节省运行费用,但是,当进水负荷变化幅度非常大时,任何控制也难于使出水水质达标,而运行费用还会大幅度增大.相对而言,同时限制平均与最高出水BOD浓度是更合理的排放标准,它既有利于污水处理厂的运行管理又能有效地保护受纳水体.初始状态S(0)对最优控制的影响不大.而X(0)的影响较大,在本研究中,X(0)的最优值在2400-2600mg/L范围内. 相似文献
3.
Makino Yamada Yamanoshita Masahiro Amano 《Mitigation and Adaptation Strategies for Global Change》2012,17(4):425-440
It has been recognized that the involvement of local community is essential to ensure the sustainability of A/R CDM (afforestation/reforestation
clean development mechanism) project. This study verifies if the risks of non-permanence and leakage are addressed in a registered
small scale A/R CDM project in Vietnam. Workshops, interviews, and a questionnaire survey of local villagers revealed that
the project has caused a shortage of land for conventional activities such as grazing, fuel wood collection and shifting cultivation,
and consequently posed the risks of project non-permanence and leakage. It is suggested that participation of all stakeholders
in the community to the A/R CDM project beyond existing land tenure and adequate carbon benefit sharing according to the level
of contribution to the project are required to reduce the risk of non permanence. To ensure the participation, the community
should have capability such as consensus building and collective action. Leakage would be minimized if the community has alternative
measures to the conventional activities before starting the project. We argue that it is necessary to first develop a community’s
capabilities in the readiness phase of any A/R CDM project in order to reduce the risks for the project sustainability, and
that new sources of funding are needed for this purpose. 相似文献
4.
Koarashi J Amano H Andoh M Iida T Moriizumi J 《Journal of environmental radioactivity》2002,60(3):249-261
To realize the dynamical behavior of 14C among exchangeable carbon reservoirs in terrestrial environment, a method for in situ determination of 14CO2 flux at soil-atmosphere interface and a high flow rate CO2 sampler were developed. This method allowed us to collect integrated quantity of CO2 for determining 14C activity over an extended time period under environmental conditions with minimal site disturbance. The 14CO2 flux from ground surface was estimated to be 1.59 x 10(-5) Bq m (-2) S (-1) in a forest floor with the method. The specific activities of 14C in environmental materials such as some biological and air samples were also determined in the vicinity of the place, where the flux measurement was made, to discuss the behavior of 14C in the forest ecosystem. The results indicated that fresh pine needles had a similar 14C specific activity to the atmospheric CO2 at the same height due to its fairly rapid equilibrium, 14C specific activity in the atmospheric CO2 has a concentration gradient near the ground surface and, at least in this site, CO2 with high 14C specific activity was generated by decomposition of soil organic matter which may be accumulated in soil as a result of former nuclear weapons tests. 相似文献
5.
Biodegradation of Polycaprolactone Powders Proposed as Reference Test Materials for International Standard of Biodegradation Evaluation Method 总被引:1,自引:0,他引:1
Masahiro Funabashi Fumi Ninomiya Masao Kunioka 《Journal of Polymers and the Environment》2007,15(1):7-17
Polycaprolactone (PCL) powders were prepared from PCL pellets using a rotation mechanical mixer. PCL powders were separated
by sieves with 60 and 120 meshes into four classes; 0–125 μm, 125–250 μm, 0–250 μm and 250–500 μm. Biodegradation tests of
PCL powders and cellulose powders in an aqueous solution at 25°C were performed using the coulometer according to ISO 14851.
Biodegradation tests of PCL powders and cellulose powders in controlled compost at 58°C were performed by the Mitsui Chemical
Analysis and Consulting Service, Inc. according to ISO 14855-1 and by using the Microbial Oxidative Degradation Analyzer (MODA)
instrument according to ISO/DIS 14855-2. PCL powders were faster biodegraded than cellulose powders. The reproducibility of
biodegradation of PCL powders is excellent. Differences in the biodegradation of PCL powders with different class were not
observed by the ISO 14851 and ISO/DIS 14855-2. An enzymatic degradation test of PCL powders with different class was studied
using an enzyme of Amano Lipase PS. PCL with smaller particle size was faster degraded by the enzyme. PCL powders with regulated sizes from 125 μm to 250 μm
are proposed as a reference material for the biodegradation test. 相似文献
6.
Mamoru Nishioka Nakamichi Yamasaki Hiroshi Amano Masanori Higuchi 《Waste management (New York, N.Y.)》1992,12(4)
Tritium is generally disposed of as an oxide form, and immobilization of tritium oxide with Portland cement is the most popular disposal method. However, the cement solidified body is rather leachable for tritium and is poor in some physical properties. A silicate powder, such as borosilicate glass powder, forms a synthetic rock by the hydrothermal hot-pressing (HHP) technique, making it a technique for immobilization of tritium oxide. Tritium oxide with borosilicate glass powder was solidified by the HHP technique. Leachability of tritium from the produced solidified bodies and the behavior of fixed tritium oxide during the heating were studied and discussed. The amount of tritium oxide fixed by the present procedure was almost the same as that fixed by the ordinary cement solidifying procedure. The diffusivity of tritium from the body by this procedure was much lower than that from the cement body and the compressive strength of the body was higher than that of the cement body. 相似文献
7.
Otosaka S Amano H Ito T Kawamura H Kobayashi T Suzuki T Togawa O Chaykovskaya EL Lishavskaya TS Novichkov VP Karasev EV Tkalin AV Volkov YN 《Journal of environmental radioactivity》2006,91(3):128-145
Distributions of anthropogenic radionuclides ((90)Sr, (137)Cs and (239+240)Pu) in seabed sediment in the Japan Sea were collected during the period 1998-2002. Concentration of (90)Sr, (137)Cs and (239+240)Pu in seabed sediment was 0.07-1.6 Bq kg(-1), 0.4-9.1 Bq kg(-1) and 0.002-1.9 Bq kg(-1), respectively. In the northern basin of the sea (Japan Basin), (239+240)Pu/(137)Cs ratios in seabed sediment were higher and their variation was smaller compared to that in the southeastern regions of the sea. The higher (239+240)Pu/(137)Cs ratios throughout the Japan Basin were considered to reflect production of Pu-enriched particles in the surface layer and substantial sinking of particulate materials in this region. In the southern regions of the Japan Sea (<38 degrees N), both inventories and (239+240)Pu/(137)Cs ratios in sediment were larger than those in the other regions. In the southern Japan Sea, observations suggested that supply of particulate radionuclides by the Tsushima Warm Current mainly enhanced accumulation of the radionuclides in this region. 相似文献
8.
9.
Pharmacophagous acquisition of clerodendrins by the turnip sawfly (Athalia rosae ruficornis) and their role in the mating behavior 总被引:3,自引:0,他引:3
Summary. Adults of the turnip sawfly, Athalia rosae ruficornis (Tenthredinidae: Hymenoptera), frequently visit a plant, Clerodendron trichotomum (Verbenaceae), and feed pharmacophagously on the glandular trichomes on the leaf surface. A series of neo-clerodane diterpenoids (e.g. clerodendrins B and D) contained in glandular organs on the leaf surface stimulate feeding of the sawflies (both males and
females). The adults fed selectively on the trichomes were found to sequester a series of the bitter-tasting diterpenes (clerodendrin
D, ajugachin A, athaliadiol) in the body tissues, which suggested their primary role as defense substances against predators.
Females fed on Clerodendron leaves or on clerodendrin B or D were more successful in mating than unfed females. Thus, females seem to obtain an advantage
in mating success through the acquisition of the defensive principles from the Clerodendron plant.
Received 20 April 1999; accepted 29 June 1999 相似文献
10.
Ryoko Fujiyoshi Yukihide Haraki Takashi Sumiyoshi Hikaru Amano Ivan Kobal Janja Vaupotič 《Environmental geochemistry and health》2010,32(1):73-82
Radon (222Rn) and carbon dioxide were monitored simultaneously in soil air under a cool-temperate deciduous stand on the campus of Hokkaido
University, Sapporo, Japan. Both 222Rn and CO2 concentrations in soil air varied with atmospheric (soil) temperature in three seasons, except for winter when the temperature
in soil air remained constant at 2–3°C at depth of 80 cm. In winter, the gaseous components were influenced by low-pressure
region passing through the observation site when the ground surface was covered with snow of ~1 m thickness. Carbon isotopic
analyses of CO2 suggested that CO2 in soil air may result from mixing of atmospheric air and soil components of different origins, i.e. CO2 from contemporary soil organic matter and old carbon from deeper source, to varying degrees, depending on seasonal meteorological
and thus biological conditions. 相似文献