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1.
DevelopmentoftheprocedureforthestabilizationofrainwatersamplesYuanZhongxin;Chung-ShinYuan(DepartmentofChemicalEngineeringNati... 相似文献
2.
On the study of ecosystem health:state of the art 总被引:2,自引:0,他引:2
IntroductionDuringlastdecades,theterm“ecosystemhealth”isusedwithincreasingfrequencyintheliterature.Thegrowinginterestsinthestu... 相似文献
3.
Simen Vergote Francesca Maria Russo David Basurto Jan Deprest Neeltje Crombag 《黑龙江环境通报》2023,43(8):1018-1027
Objective
To explore the views and practices of maternal-fetal medicine specialists on offering fetoscopic endoluminal tracheal occlusion (FETO) for left- and right-sided congenital diaphragmatic hernia (LCDH, RCDH) in the post Tracheal Occlusion To Accelerate Lung growth (TOTAL)-trial era.Method
Cross-sectional knowledge, attitude and practice survey was conducted among 105 attendees of the 19th World Congress of Fetal Medicine.Results
On average, respondents were knowledgeable about CDH, involved in research, and provided antenatal treatment options. Four out of five (82%) agreed that neonatal survival in LCDH can be reliably predicted in the prenatal period. Few respondents considered the exact risks and benefits of FETO for severe LCDH as being unclear (16%), yet half were uncertain about this for moderate LCDH (57%) and severe RCDH (45%). Most respondents offer FETO for severe LCDH (97%) and RCDH (79%), but only 59% offer it for moderate LCDH. However, half of respondents (58%) stated that not offering FETO for moderate LCDH would be a psychological burden for parents.Conclusion
Respondents consider the risk-benefit ratio of FETO for severe LCDH clear and consistently offer FETO, but not for moderate LDCH and severe RCDH. However, not offering the option of FETO to parents was considered a psychological burden. 相似文献4.
5.
Based on the significant enhancement of fluorescence intensity of carbaryl in inclusion complex, a spetrofluorimetric method with high sensitivity was developed for the determination of carbaryl in aqueous solution. Under the optimum conditions, the complex had excitation and emission maxima at 278 nm and 332 nm, respectively. The linear range of the method was 7.0 ng/ml-1500 ng/ml with a detection limit of 1.2 ng/ml. The proposed method was successfully used to determine quantitatively of carbaryl in cottonseeds. 相似文献
6.
《世界环境》2006,(2)
Central to the mission of America's environmental schools is the development of professional environmental managers. The majority of our graduate students at Yale are enrolled in our master of environmental management program. But what exactly is environmental management? When I am asked this question, I reply that environmental management is the new business of bringing our human enterprise into harmony with the natural world of which we are a part. And I add: it's the most important thing in the world. 相似文献
7.
Fernando Dias de Avila Pires 《环境科学学报(英文版)》1997,9(2):246-256
OntheecologyofvectorsFernandoDiasdeAvilaPiresDepartmentofTropicalMedicine,InstitutoOswaldoCruz,21045900RiodeJaneir,BrazilAb... 相似文献
8.
9.
Yang Su Ye Qi Zhouyan Xiao Yu Wei 《Frontiers of Environmental Science & Engineering in China》2009,3(1):75-90
With the development of rural pollution, its characteristic and institutional factor should be studied for pollution control
through economics and sociology. Based on the data gathered from investigations by several government sectors, rural environmental
pollution can be divided into two types by its sources: internal source type and external source type. The internal source
type is the main component of rural pollution at present, which can be further divided into three types. Research shows that
the contributing institutional factors of rural pollution issues and the effectiveness of environmental management system
over rural pollution can be summarized as distinctiveness. In essence, the rural pollution issue results from the dualism
of rural and urban areas’ inadaptability to rural modernization. In detail, the contributing factors can be summed up on three
institutional levels. There are obvious loopholes in rural environmental management system which, in the meantime, is incapable
and inadaptable to rural pollution control. There exist similar questions in the related public service system, which are
intensified by inappropriate reform which brought about incompatible incentive in the recent years. However, in the eleventh
five-year plan period, there are advantageous trends in the three institutional levels.
Main data sources in this paper: ➀ the surveys on TVEs (township and village enterprises) conducted by Township Enterprise
Bureau of Ministry of Agriculture of China in 1997 and 2002; ➁ the partial survey on rural environmental conditions by EPA
(environmental protection administration) of Zhejiang Province in 2002; ➂ the survey on the pollution of IPLFs (livestock
and poultry farms) in 23 provinces, municipalities, and directly administered cities by the State Environmental Protection
Administration of China in 2002; ➃ the research report on Mechanism of Investment and Financing for Environmental Protection
by China Council for International Environment and Development Cooperation in 2003; ➄ the third investigation on national
hygiene service in 2003; ➅ the regular monitoring of safe quality of agricultural products by the Ministry of Agriculture
of China in 2005; ➆ the investigation arranged by the Ministry of Health which finished in 2007 and showed the total situation
of rural environmental health and drinking water security of the whole country. 相似文献
10.
Sensitized effect of β-cyclodextrin on the fluorescence in the determination of carbaryl 总被引:1,自引:0,他引:1
Based on the significant enhancement of fluorescence intensity of carbaryl in inclusion complex, a spetrofluorimetdc method with high sensitivity was developed for the determination of carbaryl in aqueous solution. Under the optimum conditions, the complex had excitation and emission maxima at 278 nm and 332 nm, respectively. The linear range of the method was 7.0 ng/ml-1500 ng/ml with a detection limit of 1.2 ng/ml. The proposed method was successfully used to determine quantitativelv of carbarvl in cottonseeds. 相似文献
11.
WANG Hong-kang 《环境科学学报(英文版)》2000,12(2):154-160
IntroductionNowweallconcernourselveswiththecontemporaryproblemsofoverpopulation,resourceexploitation,environmentalpollutionand... 相似文献
12.
The World Year of Physics (2005) is an international celebration to commemorate the 100th anniversary of Einstein’s “Annus
Mirabilis.” The United Nations has officially declared 2005 as the International Year of Physics. However, the impact of Einstein’s
ideas was not restricted to physics. Among numerous other disciplines, Einstein also made significant and specific contributions
to Earth Sciences. His geosciences-related letters, comments, and scientific articles are dispersed, not easily accessible,
and are poorly known. The present review attempts to integrate them as a tribute to Einstein in commemoration of this centenary.
These contributions can be classified into three basic areas: geodynamics, geological (planetary) catastrophism, and fluvial
geomorphology. Regarding geodynamics, Einstein essentially supported Hapgood’s very controversial theory called Earth Crust
Displacement. With respect to geological (planetary) catastrophism, it is shown how the ideas of Einstein about Velikovsky’s
proposals evolved from 1946 to 1955. Finally, in relation to fluvial geodynamics, the review incorporates the elegant work
in which Einstein explains the formation of meandering rivers. A general analysis of his contributions is also carried out
from today’s perspective. Given the interdisciplinarity and implications of Einstein’s achievements to multiple fields of
knowledge, we propose that the year 2005 serve, rather than to confine his universal figure within a specific scientific area,
to broaden it for a better appreciation of this brilliant scientist in all of his dimensions. 相似文献
13.
14.
TheU .S .EnvironmentalProtectionAgencyrequestedtheNationalResearchCouncil(whichistheoperatingarmoftheU .S .NationalAcademyofSciencesandtheU .S .NationalAcademyofEngineering)tocarryoutacriticalscientificevaluationofindicatorstomonitorecologicalchangesfromeit… 相似文献
15.
Ozone decomposition under the irradiation of 253.7 nm in the presence of methyl bromide 总被引:2,自引:0,他引:2
IntroductionOverpastten years,thestratosphericozonedepletionhasbeencontributedtotheactivechlorideandbromide(Harris,1995) .Althoughtheconcentrationofbromideismuchlessthanthatofchloride,theozonedepletionefficiencyofbromideis 50timesgreater (Harris,1995;McElroy ,1986)… 相似文献
16.
Rull V 《Die Naturwissenschaften》2004,91(3):139-142
The peculiar biogeography of the so-called Lost World, i.e. the summits of sandstone tableaux (tepuis) in the Neotropical Guyana region of Venezuela, has generated a debate regarding the factors that are thought to account for modern vegetation patterns in the region. Some argue that plant communities on these high-elevation summits reflect a long history of evolution in isolation, while others surmise that there has been substantial biotic interchange with the surrounding lowlands during glacial times. Until now, these apparently competing hypotheses have not been tested using palaeoecological methods. I used pollen analysis of Quaternary sediments and documented past vertical migrations of vegetation in response to climate changes, which supports the second hypothesis. Physiographical analysis, however, shows that about half the tableaux summits are too high for their flora to have reached the lowlands during the last glaciation, suggesting that a portion of the tableaux vegetation has always experienced some degree of biotic isolation. Thus, a component of the summit vegetation evolved in isolation, whereas other taxa experienced interchange, as reflected in endemism patterns among the tableaux summits. Biogeographical patterns on the summits are the result of complex evolutionary processes. The two hypotheses invoked to explain the vegetation patterns are not mutually exclusive, but instead complement one another. 相似文献
17.
AppljcationofthethermallenseffectfordeterminationofiodideGuXiaomei:WangShunrong;QinKexuan;Lijiechun(ResearchCenterforEco-Envi... 相似文献
18.
Felix G. Marx Mónica R. Buono R. Ewan Fordyce R. W. Boessenecker 《Die Naturwissenschaften》2013,100(3):257-261
The origin of the pygmy right whale (Caperea marginata) has long been one of the most vexing conundrums of marine mammal evolution. The extremely disparate skeletal structure of Caperea and a patchy fossil record have left morphology and molecules at odds: whereas most morphological analyses ally Caperea with right whales (Balaenidae), most molecular studies instead suggest a close relationship with rorquals (Balaenopteridae) and grey whales (Eschrichtiidae). The morphological evidence supporting a Caperea-balaenid clade consists of several shared features of the skull and mandible, as traditionally observed in adult individuals. Here, we show that at least two of these features, the ascending process of the maxilla and the coronoid process, arise from substantially different precursors early during ontogeny and therefore likely do not represent genuine synapomorphies. Both of these juvenile morphologies have adult counterparts in the fossil record, thus indicating that the ontogenetic variation in the living species may be a genuine reflection of differing ancestral states. This new evidence contradicts previous morphological hypotheses on the origins of Caperea and may help to reconcile morphological and molecular evidence. 相似文献
19.
Ecological and environmental water demand of the lakes in the Haihe-Luanhe Basin of North China 总被引:4,自引:0,他引:4
IntroductionTheHaihe LuanheBasinisthedistrictfacingtheproblemofwatercrisisintheNorthChina.Waterpollutionissuesandanthropogenicdisturbanceareveryseriousatthesametime .Waterdeficiency ,pollutionandoverpopulationhaveresultedinobviousecologicaldegradationan… 相似文献
20.
《Atmospheric Environment. Part A. General Topics》1993,27(9):1397-1407
European regulations exist to phase-out production of the ozone-depleting man-made CFCs. High frequency measurements of the principal CFCs and other radiatively active gases have been collected at Mace Head, Ireland from 1987–1990 as part of the Global Atmospheric Gases Experiment (GAGE). These measurements provide the first clear evidence that this phase-out is effective. Allocation of the time series beginning at the end of 1988, to a particular wind sector combined with simple modelling techniques indicates a significant reduction in European source strengths for CFC-11 and CFC-12 which is consistent with reliable emission estimates for CFC-11, but which seem to indicate a slightly smaller reduction for CFC-12, when likewise compared to emission figures. The study provides evidence that European CH4, CCl2F2 and CCl3F emission have already declined to about one-third of 1987 levels by the end of 1990. Over the same period, no evidence of any phase-out in the European usage of methyl chloroform and CFC-113 was detected. 相似文献