检索结果-南通市图书馆

Behavior of Siderophile and Chalcophile Elements in the Subcontinental Lithospheric Mantle beneath the Changbaishan Volcano,NE China

引用

Acta Geologica Sinica(English Edition) 2012年第2期86卷 407-422页

作者： WANG jian liu Jinlin HATTORI Keiko XU Wenliang XIE Zhipeng SONG Yue College of Earth Sciences Jilin UniversityChangchun 130061China Department of Earth Sciences University of OttawaOttawaOntarioCanada KIN6N5

The mantle xenoliths in the Quaternary ChangbaishanVolcano in southern Jilin Province contain spinel-facies lherzolites. The equilibration temperatures for these samples range from 902℃ to 1064℃ based on the two-pyroxene thermometer of Brey and Kohler （1990）, and using the oxybarometry of Nell and Wood （1991）, the oxidation state was estimated from FMQ-1.32 to -0.38 with an average value of FMQ-0.81 （n = 8）, which is comparable to that of abyssal peridotites and the asthenospheric mantle. ThefO2 values of peridotites, together with their bulk rock compositions （e.g., Mg#, Al2O3, CaO, Ni, Co, Cr） and mineral compositions （e.g., Mg# of olivine and pyroxene, Cr# [=Cr/ [Cr＋Al]] and Mg# [=Mg/[Mg＋Fe2~] of spinel）, suggest that the present-day subcontinental lithospheric mantle （SCLM） beneath the Changbaishan Volcano most likely formed from an upwelling asthenosphere at some time after the late Mesozoic and has undergone a low degree of partial melting. The studied lherzolite xenoliths show low concentrations of S, Cu, and platinum group elements （PGE）, which plot a flat pattern on primitive-mantle normalized diagram. Very low concentrations in our samples suggest that PGEs occur as alloys or hosted by silicate and oxide minerals. The compositions of the studied samples are similar to those of peridotite xenoliths in the Longgang volcanic field （LVF） in their mineralogy and bulk rock compositions including the abundance of chalcophile and siderophile elements. However, they are distinctly different from those of peridotite xenoliths in other areas of the North China Craton （NCC） in terms of Cu, S and PGE. Our data suggest that the SCLM underlying the northeastern part of the NCC may represent a distinct unit of the newly formed lithospberic mantle.

关键词： Subcontinental lithospheric mantle siderophile and chalcophile elements oxidation state(fO2) upwelling asthenosphere Changbaishan Volcano

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

Source identification of aluminum in surface sediments of the Yellow Sea off the Shandong Peninsula

引用

Acta Oceanologica Sinica 2015年第12期34卷 147-153页

作者： XU Gang liu jian PEI Shaofeng KONG Xianghuai HU Gang GAO Maosheng Qingdao Institute of Marine Geology Ministry of Land and Natural Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology Key Laboratory of Ministry of Land and Natural Resources for Marine Hydrocarbon Resources and Environment Geology Key Laboratory of China Geological Survey Bureau for Coastal Wetland Biogeosciences

Surface sediment samples in the near shore area of the north Shandong Peninsula are collected for grain size and element analyses. The results indicate that the surface sediments in the study area are primarily composed of the silt-sized components similar to the Huanghe River. The total concentration of aluminum varies from 5.57% to7.37%（average（6.33 ± 0.40）%）, and its spatial distribution is mainly controlled by the grain size. Correlations between the ratio of aluminum to titanium concentration and aluminum concentration, titanium concentration and the mean grain size indicate that aluminum in the near shore surface sediments is affected majorly by the terrigenous source, and partially by the anthropogenic source. The ratios of aluminum to titanium concentrations are larger than the background value of loess matter at some stations due to the existence of excess aluminum associated with human activities. Thus, the sources of aluminum should be identified firstly when aluminum is used as an index of terrigenous matter even in the near shore area dominated by terrigenous deposits.

关键词： aluminum source identification surface sediments Shandong Peninsula Yellow Sea

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

3-D NUMERICAL SIMULATIONS OF FLOW LOSS IN HELICAL CHANNEL

引用

Journal of Hydrodynamics 2012年第6期24卷 858-863页

作者： ZHAO Ling-zhi PENG Yan LU Fang LI jian LI Ran liu Bao-lin Institute of Electrical Engineering Chinese Academy of Sciences College of Computing and Communication Engineering University of Chinese Academy of Sciences China Ship Scientific Research Center

The flow loss of a helical channel Magnetohydrodynamic （MHD） thruster without MHD effect was numerically studied with 3-D simulations, and a flow loss coefficient （ was defined to quantify the flow loss and its influencing factors were studied. The results show that （ decreases in a first-order exponential manner with the pitch of a helical wall and the Reynolds number, and it declines slowly when t / T 〉 0.2 and Re 〉 10^5, a flow guide makes the flow more smooth and uniform, especially in the flow guide and helical wall sub-regions and thus reduces the flow loss greatly, by about 30% with the averaged value of （ from 0.0385 to 0.027, a rectifier weakens the helical flow and strengthens the axial one in the rectifier and outlet sub-regions, thus reduces the rotational kinetic pressure with the averaged value of ξ declining about 4% from 0.0385 to 0.037, and ξ decreases with a rectifier＇s axial length when Re 〉 10^5 .

关键词： helical channel Magnetohydrodynamic (MHD) propulsion rectifier flow guide flow loss

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

Waste Water Disinfection During SARS Epidemic for Microbiological and Toxicological Control

引用

Biomedical and Environmental Sciences 2006年第3期19卷 173-178页

作者： CHAO CHEN XIAO-jian ZHANG YUN WANG LING-XIA ZHU JING liu Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

Objective To evaluate the disinfection of wastewater in China. Methods During the SARS epidemic occurred in Beijing, a study of different disinfection methods used in the main local wastewater plants including means of chlorine, chlorine dioxide, ozone, and ultraviolet was carried out in our laboratory. The residual coliform, bacteria and trihalomethanes, haloacetic acids were determined after disinfection. Results Chlorine had fairly better efficiency on microorganism inactivation than chlorine dioxide with the same dosage. Formation of THMs and HAAs does not exceed the drinking water standard. UV irradiation had good efficiency on microorganism inactivation and good future of application in China. Organic material and ammonia nitrogen was found to be significant on inactivation and DBPs formation. Conclusion Chlorine disinfection seems to be the best available technology for coliform and bacteria inactivation. And it is of fairly low toxicological hazard due to the transformation of monochloramine.

关键词： Wastewater disinfection Chlorine Chlorine dioxide Ozone Ultraviolet Disinfection by-products

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

Synthesis and Structure of a Manganese(Ⅱ) Complex: [Mn_2·(dinitrobenzoic acid)_4·(1,10-phen)_2]_n

引用

Chinese Journal of Structural Chemistry 2007年第2期26卷 139-142页

作者： WANG jian HUANG Mei-Hua liu Ping CHENG Wen-Dan ZHANG Li-Mei Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China 不详

The title compound, [Mn2·（dinitrobenzoic acid）4·（1,10-phen）2]n, has a linear chain structure containing binuclear [Mn2·（dinitrobenzoic acid）4（1,10-phen）2] repeat units. It crystallizes in the triclinic system, space group Pi with a = 7.9261（8）, b = 12.1329（15）, c = 14.847（2）A, α = 103.845（5）, β = 101.424（5）, γ = 92.618（4）°, Mr= 657.37, V = 1352.3（2）A^3, Z = 2, De= 1.614 g/cm^3, F（000） = 666,μ = 0.567 mm^-1, the final R = 0.0407 and wR = 0.1015 for 4081 observed reflections with I 〉 2σ（I）. The Mn atom is six-coordinated by two N and four O atoms, forming a slightly distorted octahedral geometry. All Mn-O and Mn-N bond distances range from 2.093（2） to 2.310（2）A. Two adjacent octahdral units are bridged together by two pairs of bi-monodentate carboxyl groups of different dinitrobenzoic acids to form an eight-membered ring with chair-typed configuration, thus generating a one-dimensional chain along the a axis.

关键词： crystal structure manganese complex eight-membered ring one-dimensional chain

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

Design of a node architecture for logic-calculation Nased all-optical network coding scheme

引用

The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 110-116,128页

作者： QU Zhi-jian XIE Yin-bao WANG Ju-hui liu Xiao-hong School of Computer Science and Technology Shandong University of Technology

Network coding brings many benefits for multicast networks. It is necessary to introduce network coding into optical networks. Nevertheless, the traditional network coding scheme is hard to be implemented in optical networks because of the weak operation capability in photonic domain. In the paper, we focused on realizing two-channel network coding in all-optical multicast networks. An optical network coding scheme which can be realized via logic shift and logic XOR operations in photonic domain was proposed. Moreover, to perform the network coding scheme the coding node structure was designed and the operation principle and processes were illustrated in detail. In the end of the paper, the performance and the cost of different all-optical multicast mode were compared and analyzed.

关键词： network coding optical logic calculation coding node all-optical multicast

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

Combination of ribavirin and reduning protects mice against severe pneumonia induced by H1N1 influenza a virus

引用

Journal of Traditional Chinese Medicine 2016年第2期36卷 181-186页

作者： Ma Yuexia Zhang Wei Zhao Zhongpeng Li Min liu jian Wang Yuguang Department of Internal Medicine the Traditional Chinese Medicine Hospital of Beijing Huairou Beijing Hospital of Traditional Chinese Medicine affiliated with Capital Medical University Beiiinq 100010 China The Infectious Diseases Diagnostic Therapeutic and Research center the Synergetic and Innovative Centre for the Prevention and Treatment of Key Infectious DiseasesCapital Medical University Beijing 100015 China Department of Immunology Beijing Institute of Microbiology and Epidemiology State Key Laboratory of Pathogen and Biosecurity Beijing 100071 China Laboratory Animal Center Academy of Military Medical Science Beijing 100071 China Pneumology Department Beijing Hospital of Traditional Chinese Medicine Affiliated with Capital Medical University Beijing 10001O China

OBJECTIVE:To investigate the effects of ribavirin administration combined with Reduning in a mouse model of influenza A(H1N1)-induced severe ***:Influenza A/Beijing/501/2009(H1N1)-infected C57BL/6 mice were randomly divided into four experimental groups treated with either a mock injection of phosphate-buffered saline(PBS),ribavirin(66.6 mg/kg daily)or Reduning(86.6 mg/kg daily),or a combination of both,for 7 *** were monitored for clinical signs and survival,and body weight was measured daily for 14 *** titer,lung wet-to-dry ratios,pathology and cytokines including interleukin(IL)-6,IL-10,and interferon(IFN)-γwere assayed on different ***:In the untreated group injected with phosphate buffer saline,all the mice died of the *** survival rate of mice treated with Reduning was only 10%,whereas 100%of the ribavirin-and the combination-treated mice *** lung viral loads indicated that ribavirin significantly inhibited virus replication,whereas Reduning did *** wet-to-dry ratios demonstrated that both ribavirin and Reduning,administered together or separately,reduced acute lung edema compared with results in the untreated *** analyses also showed that treatment with a combination of both drugs relieved pathological lesions,whereas the single drug treatment did *** of IL-6,IL-10 and IFN-γin mice treated with ribavirin or the combination of both ribavirin and Reduning were all significantly lower than in the untreated group,especially in the combination-treated *** addition,Reduning administration significantly decreased both IL-6 and IL-10production but had no effect on IFN-γ.CONCLUSION:Due to the synergistic effect of antiviral and antiinflammation,the combination of ribavirin and Reduning could be an effective treatment for severe H1N1 which was considered to be significant to delayed antiviral and drug resistant.

关键词： Influenza Human Pneumonia Ribavirin Medicine Chinese Traditional Reduninginjection

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 scanning speed during PTA remelting treatment on the microstructure and wear resistance of nodular cast iron

引用

International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 363-370页

作者： Hua-tang Cao Xuan-pu Dong Qi-wen Huang Zhang Pan jian-jun Li Zi-tian Fan State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology

The surface of nodular cast iron （NCI） with a ferrite substrate was rapidly remelted and solidified by plasma transferred arc （PTA） to induce a chilled structure with high hardness and favorable wear resistance. The effect of scanning speed on the microstructure, micro-hardness distribution, and wear properties of PTA-remelted specimens was systematically investigated. Microstructural characterization in-dicated that the PTA remelting treatment could dissolve most graphite nodules and that the crystallized primary austenite dendrites were transformed into cementite, martensite, an interdendritic network of ledeburite eutectic, and certain residual austenite during rapid solidifica-tion. The dimensions of the remelted zone and its dendrites increase with decreased scanning speed. The microhardness of the remelted zone varied in the range of 650 HV0.2 to 820 HV0.2, which is approximately 2.3-3.1 times higher than the hardness of the substrate. The wear re-sistance of NCI was also significantly improved after the PTA remelting treatment.

关键词： nodular cast iron surface treatment plasma arc remelting scanning speed microhardness wear resistance

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

Dependence Tree Structure Estimation via Copula

引用

International Journal of Automation and computing 2012年第2期9卷 113-121页

作者： jian Ma Zeng-Qi Sun Sheng Chen Hong-Hai liu Department of Computer Science Tsinghua University Beijing 100084 PRC Electronics and Computer Science Faculty of Physical and Applied Sciences University of Southampton Southampton SO17 1B J UK Faculty of Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia Intelligent Systems and Robotics Research Group School of Creative Technologies University of Portsmouth Portsmouth PO1 2D J UK

We propose an approach for dependence tree structure learning via copula. A nonparametric algorithm for copula estimation is presented. Then a Chow-liu like method based on dependence measure via copula is proposed to estimate maximum spanning bivariate copula associated with bivariate dependence relations. The main advantage of the approach is that learning with empirical copula focuses on dependence relations among random variables, without the need to know the properties of individual variables as well as without the requirement to specify parametric family of entire underlying distribution for individual variables. Experiments on two real-application data sets show the effectiveness of the proposed method.

关键词： Copula empirical copula dependence tree structure learning probability distribution.

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

Tribological behaviors of hydrogenated diamond-like carbon films in different testing environments

引用

中国有色金属学会会刊:英文版 2004年第Z1期14卷 341-347页

作者： CHEN jian-min LI Hong-xuan XU Tao ZHOU Hui-di liu Hui-wen State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

Hydrogenated diamond-like carbon (DLC) films were deposited on Si substrate using plasma enhanced chemical vapor deposition(PECVD) technique with CH4 plus H2 as the feedstock. The tribological properties of the hydrogenated DLC films were measured on a ball-on-disk tribometer in different testing environments (humid air,dry air, dry O2, dry Ar and dry N2 ) sliding against Si3 N4 balls. The friction surfaces of the films and Si3 N4 balls were observed on a scanning electron microscope (SEM) and investigated by X-ray photoelectron spectroscopy (XPS). The results show that the tribological properties of the hydrogenated DLC films are strongly dependent on the testing environments. In dry Ar and dry N2 environments, the hydrogenated DLC films provide a superlow friction coefficient of about 0. 008 -0.01 and excellent wear resistance (wear life of above 56 km). In dry air and dry O2, the friction coefficient is increased to 0. 025 - 0.04 and the wear life is decreased to about 30 km. When sliding in moist air, the friction coefficient of the films is further increased to 0. 08 and the wear life is decreased to 10. 4 km. SEM and XPS analyses show that the tribological behaviors appear to rely on the transferred carbon-rich layer processes on the Si3 N4 balls and on the friction-induced oxidation of the films controlled by the nature of the testing environments.

关键词： hydrogenated DLC films tribological behaviors testing environments PECVD

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

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

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：