检索结果-南通市图书馆

Seasonal variations and sources of mass and chemical composition for PM_(10) aerosol in Hangzhou,China

Particuology 2009年第3期7卷 161-168页

作者： Junji Cao Zhenxing Shen Judith C. Chow guowei Qi John g. Watson State Key Lab of Loess and Quaternary geology - SKLLQg. Institute of Earth Environment ChineseAcademy of Sciences Xi'an. Shaanxi 710075 China Department of Environmental Science and Engineering. xi'an Jiaotong University. Xi'an 710049. China Division of Atmospheric Sciences. Desert Research Institute. Reno. USA Hangzhou Municipal Environmental Monitoring Center Hangzhou 310007 China

Aerosol observation was conducted for four seasons from September 2001 to August 2002 at five sampling sites in Hangzhou, South China, on PM10 mass, 22 elements （Na, Mg, AI, Si, P, S, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As. Se, Br, Cd, Ba, and Pb）, 5 major ions （F^-, Cl^ , NO3^-, SO4^2- , and NH4^＋）, and organic and elemental carbon （OC and EC）, showing that PM10 mass ranged from 46.7 to 270.8 μg/m^3, with an annual average of 119.2 μg/m^3. Na, AI, Si, S, K, Ca, and Fe were the most abundant elements in PM10, most of S being in the form of SO4^2- . SO4^2-, NO3^-, and NH4^＋ were the major ions, which contributed to about 20% of the PM10 mass. The mean seasonal concentrations for SO4^2- , averaged over all sites, were found to be 18.0, 18.5, 24,Z and 21.4 μg/m^3, for spring, summer, autumn, and winter, respectively, while the corresponding loadings for NO3^- were 7.2, 4.7, 7.1, and 11.2 μg/m^3, and for NH4^＋ were 6.0, 5.9, 8.2, and 9.3 μg/m^3, in the form mostly of NH4NO3 in spring, autumn, and winter, and mostly of （NH4）2SO4 in summer. The low NO3^-/SO4^2- ratio found indicates coal combustion as the major source throughout the year. The mean annual concentrations of OC and EC in PM10 were found to be 21.4, and 4.1 μg/m^3, respectively. Material balance calculation indicated that fugitive dust, the secondary aerosol, and carbonaceous matter were the most abundant species in PM10 for the four seasons, as is characteristic for cities in South China.

关键词： PM10 Elements lons Carbon Material balance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Different Reproductive Stages and Culture Times on Domestic Cat in Vitro Oocyte Maturation

引用

Advances in Reproductive Sciences 2021年第2期

作者： José Ernesto Hernández Pichardo Miguel Ramses Del Moral Reyes Michael E. Kjelland José Luis rodríguez Suastegui

来源：评论

学校读者我要写书评

暂无评论

Studies on effects of Andrographis paniculata(Burm.f.) and Andrographis lineata nees(Family:Acanthaceae) extracts against two mosquitoes Culex quinquefasciatus(Say.) and Aedes aegypti(Linn.)

引用

Asian Pacific Journal of Tropical Medicine 2013年第3期6卷 176-179页

作者： Renugadevi g Ramanathan T Shanmuga priya R Thirunavukkarasu P Centre of Advanced Study in Marine Biology Faculty of Marine SciencesAnnamalai UniversityParangipettai 608 502Tamil NaduIndia

Objective:To investigate the studies on effects of Andrographis paniculata(***) (Burm.f.) and Andrographis lineata(***) nees(Family:Acanthaeeae)extracts against two mosquitoes Culex quinquefasciatus(***)(Say.) and Aedes aegypti(***) (Linn.).Methods:The aqueous and petroleum ether extracts of two plant *** and *** were examined against the larvae of,***(L.) and *** with gradually increasing concenlration *** 50 to 200 ppm of solvent extracts and to test their activity in combination with each ***:In a 24 h bioassay experiment with plant extracts,highest mortalities were recorded at 200 ppm of concentrations for leaves of *** and *** *** combination effect,only 150 ppm of the mixture of solvent extracts of petroleum ether:aqueous(1:1) extracts showed 100%mortality after 24 h of exposure. Conclusions:The results show that,insecticides of plant combination is ecofriend and has better larvicidal activity compared to individual extracts.

关键词： Andrographis paniculata Culex quinquefasciatus Petroleum ether Larvicidal activity Combination effect Mosquitoes Chikungunya fever

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

SOLIDIFICATION MECHANISM OF UNDERCOOLEDSINgLE PHASE ALLOYS

引用

Acta Metallurgica Sinica(English Letters) 1998年第2期11卷 100-106页

作者： J.F.Li g.C.Yang Y.H.Zhou Northwestern Polytechnical Univ Xi'an China

The solidification behavior of bulk undercooled Ni50Cu50 alloy was systematically investigated. Double recalescences were discovered for the first time in a single phase Ni-Cd alloy, in which there is no solid phase transition at elevated temperature. When the alloy melt was undercoolcd below the solidus temperature, the effect of nonequilibrium solidification could make the solid with the norminal composition C0 of the alloy nucleate and grow till tempemture approached To (the temperuture at which the free enengies of solid and liquid with C0 are equal). Following it, the nucleation and growth of the solid with more high melting point component were required, so the secondary recalescence took place. The concentration distribution in crystals was also analysed.

关键词： undercooled Ni-Cu alloy secondary recalescence solidification mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rotational and Vibrational Temperatures of Atmospheric Double Arc Argon-Nitrogen Plasma

引用

Chinese Physics Letters 2007年第5期24卷 1317-1320页

作者：严建华屠昕马增益岑可法 B. g. Chéon State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 UMR 6614 CNRS CORIA Saint Etienne du Rouvray 76801 France

The spectroscopic technique is employed to study the emission of atmospheric argon-nitrogen plasma jet generated by an original dc double anode plasma torch. The molecular bands of the N^＋2 first negative system are observed at the torch exit and chosen to evaluate the rotational and vibrational temperatures in comparison with the simulated spectra. The excitation temperature （Texc ≈ 9600 K） is determined from the Boltzmann plot method. The results show that the rotational, vibrational, electron and kinetic temperatures are in good agreement with one another, which indicates that the core region of atmospheric double arc argon-nitrogen plasma jet at the torch exit is close to the local thermodynamic equilibrium state under our experimental conditions.

关键词： N-2(+) BAND

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Factors affecting the direct mineralization of CO_2 with olivine

引用

Journal of Environmental Sciences 2011年第8期23卷 1233-1239页

作者： Soonchul Kwon Maohong Fan Herbert F. M. DaCosta Armistead g. Russell School of Civil and Environmental Engineering Georgia Institute of Technology Department of Chemical and petroleum Engineering University of Wyoming Caterpillar Inc. P.O. Box 1875 Peoria Illinois 61656 USA

Olivine, one of the most abundant minerals existing in nature, is explored as a C02 carbonation agent for direct carbonation of C02 in flue gas. Olivine based C02 capture is thermodynamically favorable and can form a stable carbonate for long-term storage. Experimental results have shown that water vapor plays an important role in improving CO/carbonation rate and capacities. Other operation conditions including reaction temperature, initial C02 concentration, residence time corresponding to the flow rate of C02 gas stream, and water vapor concentration also considerably affect the performance of the technology.

关键词： carbon dioxide mineralization flue gas carbonation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect and mechanism of coking residual ammonia water treating by flue gas

引用

Journal of Environmental Sciences 2001年第2期13卷 237-246页

作者： Z J Cheng g J Yin L Q Yang W Wang D D Cheng Environmental Protection Research Institute Central Research Institute of Building and Construction Ministry of Metallurgical Industry Beijing 100088 China.

The treatment of coking residual ammonia water has been a big difficult problem at home and abroad, and there is no breakthrough research achievement in the past. The invention patent "The method of treating all coking wastewater or treating coking residual ammonia water by flue gas" has been successfully used in Huaian Steel Works for high concentration and organic industry wastewater treatment. Not only can it realize the wastewater zero discharge, but also the wastewater treatment has an effect of de-sulfur and de-nitrogen for flue gas. So that the flue gas exhaust can meet the requirement of emission standard. The mass transfer and heat transfer, fly ash absorption and coagulation, acid and alkali neutralization reaction, catalysis oxidation and reduction reaction in flue gas would be the major factors.

关键词： Effect and mechanism of coking residual ammonia water

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fecal DNA testing for colorectal cancer screening:molecular targets and perspectives

引用

World Journal of gastrointestinal Oncology 2015年第10期7卷 178-183页

作者： Amaninder Dhaliwal Panagiotis J Vlachostergios Katerina g Oikonomou Yitzchak Moshenyat Department of Medicine NYU Lutheran Medical Center Division of gastroenterology NYU Lutheran Medical Center

The early detection of colorectal cancer with effective screening is essential for reduction of cancer-specific mortality. The addition of fecal DNA testing in the armamentarium of screening methods already in clinical use launches a new era in the noninvasive part of colorectal cancer screening and emanates from a large number of previous and ongoing clinical investigations and technological advancements. In this review, we discuss the molecular rational and most important genetic alterations hallmarking the early colorectal carcinogenesis process. Also, representative DNA targets-markers and key aspects of their testing at the clinical level in comparison or/and association with other screening methods are described. Finally, a critical view of the strengths and limitations of fecal DNA tests is provided, along with anticipated barriers and suggestions for further exploitation of their use.

关键词： Colorectal cancer Screening Fecal DNA Cologuard^(■) Adenoma

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optic Neuritis in Acute Neuroborreliosis (Lyme Disease) in the U.S.-Mexican Border: Case Report

引用

World Journal of Neuroscience 2016年第2期6卷 126-130页

作者： Ihtesham A. Qureshi Michael F. Maldonado gustavo J. rodriguez Salvador Cruz-Flores alberto Maud Neurology Department Texas Tech University Health Sciences Center El Paso USA Ophthalmology Department Texas Tech University Health Sciences Center El Paso USA

Objective: We describe a patient diagnosed with acute neuroborreliosis presenting with anterior optic neuritis (papillitis) in a non-endemic region. Case Presentation: A 43-year-old previously healthy right handed man admitted due to an insidious onset of severe headache and spells of ascending paresthesias from his right foot into his right arm and face followed by speech arrest and clumsiness of his right hand. His neurologic exam was significant for somnolence, nuchal rigidity and Kernig and Brudzinski signs were present. MRI of the brain with gadolinium showed diffuse hyperintense signal involving the supra and infratentorial cortical sulci, with associated faint diffuse leptomeningeal enhancement, consistent most likely with diffuse leptomeningoencephalitis. EEg: normal. CSF VDRL was negative. Dilated fundus exam revealed mild optic nerve edema more significant to the left than to the right eye, confirmed and measured by spectral domain OCT (Optical Coherence Tomography). There was an evidence of posterior uveitis with an early vitreous hemorrhage superficial to the left optic nerve. Lyme disease serum antibody (IgM) Immunoblotting was positive in 2 bands confirming the diagnosis of neuroborreliosis. Conclusion: Optic nerve involvement in Lyme disease is an uncommon complication that should be confirmed by specific diagnostic criteria to establish its causal relation.

关键词： Optic Neuritis Lyme Disease Non-Endemic Papillitis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Harnessing memory adaptive regulatory T cells to control autoimmunity in type 1 diabetes

引用

Journal of Molecular Cell Biology 2012年第1期4卷 38-47页

作者： Cheng-Rui Li Bas J.g.Baaten Linda M.Bradley Infectious and Inflammatory Disease Center Sanford-Burnham Medical Research Institute10901 North Torrey Pines RoadLa JollaCA 92037USA

Type 1 diabetes(T1D)results from autoimmune destruction of insulin-producing b-cells in the pancreatic *** is an immediate need to restore both b-cell function and immune tolerance to control disease progression and ultimately cure ***,there is no effective treatment strategy to restore glucose regulation in patients with ***3-expressing CD4^(+) regulatory T cells(Tregs)are potential candidates to control autoimmunity because they play a central role in maintaining ***,deficiencies in either naturally occurring Tregs(nTregs)themselves and/or their ability to control pathogenic effector T cells have been associated with ***,we hypothesize that nTregs can be replaced by FoxP3^(+) adaptive Tregs(aTregs),which are uniquely equipped to combat autoreactivity in *** nTregs,aTregs are stable and provide long-lived *** this review,we summarize the current understanding of aTregs and their potential for use as an immunological intervention to treat T1D.

关键词： type 1 diabetes adaptive regulatory T cells autoimmunity immunotherapy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：