全文获取类型
收费全文 | 49篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 15篇 |
环保管理 | 1篇 |
综合类 | 9篇 |
基础理论 | 9篇 |
污染及防治 | 8篇 |
评价与监测 | 2篇 |
社会与环境 | 5篇 |
灾害及防治 | 1篇 |
出版年
2021年 | 1篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 6篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 5篇 |
2007年 | 4篇 |
2006年 | 3篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 1篇 |
1998年 | 2篇 |
1993年 | 3篇 |
排序方式: 共有52条查询结果,搜索用时 15 毫秒
41.
Shuichi Matsumura Kiminori Amaya Sadao Yoshikawa 《Journal of Polymers and the Environment》1993,1(1):23-29
Partially dicarboxylated polyuronide having a variable amount of unreacted sugar blocks as an enzymatically cleavable segment was prepared by the controlled oxidation of pectic acid and alginic acid. It was found that partially dicarboxylated polyuronides containing uronide blocks showed better biodegradability than those having no uronide block in the polycarboxylate chain. The rate of biodegradation varies according to the degree of dicarboxylation. It was confirmed that dicarboxy polyuronides containing more than 70% unreacted uronide residues tended to biodegrade quickly. The biodegradability obtained by the BOD test and the enzymatic degradability are well correlated, suggesting that these polymers are first cleaved at the sugar blocks by carbohydrase with subsequent assimilation of the resultant oligomeric fractions. Detergency was dependent on the content of the carboxylate groups in the polymer. The polymers with high carboxylate contents showed better builder performance. The detergency of dicarboxy pectic acid was better than that of dicarboxy alginic acid when compared on the basis of an equal degree of dicarboxylation. 相似文献
42.
43.
Saito-Kokubu Y Yasuda K Magara M Miyamoto Y Sakurai S Usuda S Yamazaki H Yoshikawa S Nagaoka S Mitamura M Inoue J Murakami A 《Journal of environmental radioactivity》2008,99(1):211-217
In a sediment core of Nishiyama reservoir at Nagasaki city, depth profiles of (240)Pu/(239)Pu isotopic ratio, (239+240)Pu and (137)Cs activities were determined. Sediments containing plutonium and (137)Cs, which were deposited immediately after a detonation of Nagasaki atomic bomb, were identified in the core. Observed below the sediments were macroscopic charcoals, providing evidence for initial deposit of the fallout of the Nagasaki atomic bomb. This is the first entire depositional records of plutonium and (137)Cs released from the Nagasaki atomic bomb together with those from atmospheric nuclear tests. 相似文献
44.
Takaoka M Takeda N Fujiwara T Kurata M Kimura T 《Journal of the Air & Waste Management Association (1995)》2002,52(8):931-940
The control of Hg emissions from a municipal solid waste incinerator (MSWI) is very important, because more than 78% of municipal solid waste (MSW) is incinerated. The Hg content of coal used in utility boilers is relatively low in Japan. In this study, recent trends in the Hg content of MSW in Japan and activated carbon (AC) injection as a control technology of Hg emission from an MSWI are discussed. The effect of AC injection on Hg removal from flue gas in an MSWI was investigated by pilot-scale experiments using a bag filter (BF). The injection of AC increases the Hg reduction ratio by 20-30% compared with cases without AC injection. The Hg reduction ratio increases as the flue gas temperature decreases. The Hg reduction ratio is closely related to the inlet Hg concentration and was expressed with a Langmuir-type adsorption isotherm. 相似文献
45.
Inoue M Suzuki A Nohara M Kan H Edward A Kawahata H 《Environmental pollution (Barking, Essex : 1987)》2004,129(3):399-407
We present 40 year-long skeletal chronologies of tin (Sn) and copper (Cu) from an annually-banded coral (Porites sp.) collected from Pohnpei Island, Micronesia (western equatorial Pacific). Both the elements are present in antifouling marine paints and are released inadvertently into ambient seawater. Especially, Sn has often been used in the form of tributyltin (TBT). Based on a stepwise pretreatment examination, Sn and Cu both inside and outside the aragonite lattice of the coral skeleton show a potential for providing marine pollution indicators. High values of extra-skeletal Cu/Ca and Sn/Ca atomic ratios were found between late 1960s and late 1980s during a period of active use of TBT-based antifouling paints worldwide. However, a significant decrease in both the ratios in the beginning of 1990s can be attributed to regulation of the use of TBT on cargo ships by countries such as the USA, Japan and Australia. 相似文献
46.
The effects of various concentrations of a synthetic estrogen, ethynylestradiol (EER), and an estrogenic compound, bisphenol
A (BPA), on the development of two sea urchin species, Hemicentrotus pulcherrimus and Strongylocentrotus nudus, were examined. At concentrations of 2.5 μM or higher of EER the zygotes did not hatch; at 0.98–1.25 μM they developed but had abnormal morphology;
and at concentrations lower than 1 μM there was no effect on embryogenesis. The dose dependency was the same for both species,
but more embryos of S. nudus showed exogastrulation at 3–10 μM EER. The effect of BPA on early development was less remarkable than that of EER; most
embryos developed normally even in the presence of 2.5 μM BPA. The feeding larvae progressed and finally metamorphosed into
juveniles even at 0.1–3 μM EER. The chemicals had opposing effects on the growth of the juveniles. A low dose of EER (0.1–1 μM)
promoted growth and the average diameter of the test was bigger than that of the control group; the same dose of BPA suppressed
growth and the test was smaller than that of the control group. These results show that the sensitivity and response to endocrine
disrupter chemicals changes markedly during the ontogeny of sea urchins.
Physical and Chemical Impacts on Marine Organisms, a Bilateral Seminar Italy-Japan held in November 2004 相似文献
47.
We studied the processes of gonadal maturation, spawning, fertilization and embryonic development of the giant jellyfish Nemopilema nomurai, which has been blooming in recent years in the Sea of Japan. Healthy medusae actively swimming offshore had immature gonads,
but damaged and ashore-drifted animals had relatively mature gonads. The animals maintained in a small net on the nearshore
to mimic the drifted condition showed induced gonadal maturation by the increase in oocyte diameter and darkness in the matrix.
A similar maturation process also occurred in isolated pieces of ovary incubated at the same temperature. Fully grown oocytes
that probably stopped at the prophase of the first meiosis reinitiated maturation divisions in response to light exposure,
and massive spawnings occurred 80–100 min after the exposure. The spawned oocytes were first released within the subgenital
sinus, then transported peripherally and finally shed into the gastrovascular cavity. Maturation and spawning in male gonads
were similar to those of females except that the male spawning occurred within 30 min after the light exposure and always
preceded the female spawning. Hence, it was suggested that fertilization might take place in the female gastrovascular cavity
by the sperm that came in from surrounding seawater by animals’ pumping activities after dawn. Having mechanical damages might
promote fertilization success of this species in the Sea of Japan. 相似文献
48.
Teruhito Otsuka Hiroyasu Saitoh Takaaki Mizutani Kaoru Morimoto Norihiko Yoshikawa 《Journal of Loss Prevention in the Process Industries》2007,20(4-6):427-432
Deflagration phenomena in hydrogen–air mixtures initially filled in 1.4 m3 spherical latex balloons were measured using a high-speed digital video camera and pressure transducers. The image velocimetry using brightness subtraction was introduced to eliminate the background effects for obtaining accurate time evolution records of flame propagation velocity. The maximum flame propagation velocity of about 100 m/s was observed with maximum overpressure 15 kPa at 1 m from ignition point. According to the detailed flame propagation velocity records, there were long deceleration durations. The observed maximum overpressure was smaller than the overpressure estimated by the basis of the observed maximum flame propagation velocity and the pressure wave theories of spherical flames. A new blast curve plot of scaled overpressure vs. distance was tentatively proposed. 相似文献
49.
Polybrominated diphenyl ethers and persistent organochlorines in Japanese human adipose tissues 总被引:6,自引:1,他引:5
Kunisue T Takayanagi N Isobe T Takahashi S Nose M Yamada T Komori H Arita N Ueda N Tanabe S 《Environment international》2007,33(8):1048-1056
The present study determined concentrations of polybrominated diphenyl ethers (PBDEs) and persistent organochlorines (OCs) in Japanese human adipose tissues collected during 2003–2004. Concentrations of PBDEs in adipose tissues were 1–2 orders of magnitude lower than those of OCs. However, observed PBDE congener levels in this study were relatively higher than those in Japanese human adipose tissues collected during 2000 reported previously, while OC levels were comparable to those in specimens collected during 1999 reported by our group. In addition, no age-dependent accumulation of PBDEs was observed, while OC levels except chlordane compounds increased with age. These results indicate recent human exposure to PBDEs in Japan. Among PBDE congeners accumulated in Japanese adipose tissues, BDE-153 was dominant, but this trend was different from those in human milk (BDE-47) and blood (BDE-209) reported previously in Japan, implying the congener-specific kinetics in human bodies. The significant positive correlations between PBDEs and OCs were observed in Japanese adipose tissues, indicating the similar exposure route of these contaminants for Japanese citizens, probably via fish intake. 相似文献
50.
Tomonori Ishigaki Chu Van Chung Nguyen Nhu Sang Michihiko Ike Koji Otsuka Masato Yamada Yuzo Inoue 《Journal of Material Cycles and Waste Management》2008,10(2):165-172
A methodology for estimating the methane emissions from waste landfills in Hanoi, Vietnam, as part of a case study on Asian
cities, was derived based on a survey of documents and statistics related to waste management, interviews with persons in
charge, and field investigations at landfill sites. The waste management system in Hanoi was analyzed to evaluate the methane
emissions from waste landfill sites. The quantity of waste deposited into the landfill was evaluated from an investigation
of the waste stream. The composition of municipal waste was surveyed in several districts in the Hanoi city area, and the
quantities of degradable organic waste that had been deposited into landfill for the past 15 years were estimated. Field surveys
on methane emissions from landfills of different ages (0.5, 2, and 8 years) were conducted and their methane emissions were
estimated to be 120, 22.5, and 4.38 ml/min/m2, respectively. The first-order reaction rate of methane generation was obtained as 0.51/year. Methane emissions from waste
landfills were calculated by a first-order decay model using this emission factor and the amount of landfilled degradable
waste. The estimates of methane emissions using the model accorded well with the estimates of the field survey. These results
revealed that methane emissions from waste landfills estimated by regional-specific and precise information on the waste stream
are essential for accurately determining the behavior of methane emissions from waste landfills in the past, present, and
future. 相似文献