检索结果-南通市图书馆

Mechanism research on arsenic removal from arsenopyrite ore during a sintering process

International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 353-359页

作者： Ri-jin Cheng Hong-wei Ni hua Zhang Xiao-kun Zhang Si-cheng Bai Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China

The mechanism of arsenic removal during a sintering process was investigated through experiments with a sintering pot and arsenic-bearing iron ore containing arsenopyrite; the corresponding chemical properties of the sinter were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS). The experimental results revealed that the reaction of arsenic removal is mainly related to the oxygen atmosphere and temperature. During the sintering process, arsenic could be removed in the ignition layer, the sinter layer, and the combustion zone. A portion of FeAsS reacted with excess oxygen to generate FeAsO4, and the rest of the FeAsS reacted with oxygen to generate As2O3(g) and SO2(g). A portion of As2O3(g) mixed with Al2O3or CaO, which resulted in the formation of arsenates such as AlAsO4and Ca3(AsO4)2, leading to arsenic residues in sintering products. The FeAsS component in the blending ore was difficult to decompose in the preliminary heating zone, the dry zone, or the bottom layer because of the relatively low temperatures; however, As2O3(g) that originated from the high-temperature zone could react with metal oxides, resulting in the formation of arsenate residues. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Arsenic Atmospheric temperature Atomic emission spectroscopy Blending Energy dispersive spectroscopy Ignition Inductively coupled plasma Iron ore sinter Iron ores Mechanisms Oxygen Pollution control Scanning electron microscopy Sulfur dioxide X ray diffraction X ray spectroscopy

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

An overview of transmission theory and techniques of large-scale antenna systems for 5G wireless communications

引用

Science China(Information Sciences) 2016年第8期59卷 92-109页

作者： Dongming wang Yu ZHANG Hao wei Xiaohu YOU Xiqi GAO Jiangzhou wang National Mobile Communications Research Laboratory Southeast University School of Engineering and Digital Arts University of Kent

To meet the future demand for huge traffic volume of wireless data service, the research on the fifth generation(5G) mobile communication systems has been undertaken in recent years. It is expected that the spectral and energy efficiencies in 5G mobile communication systems should be ten-fold higher than the ones in the fourth generation(4G) mobile communication systems. Therefore, it is important to further exploit the potential of spatial multiplexing of multiple antennas. In the last twenty years, multiple-input multiple-output(MIMO) antenna techniques have been considered as the key techniques to increase the capacity of wireless communication systems. When a large-scale antenna array(which is also called massive MIMO) is equipped in a base-station, or a large number of distributed antennas(which is also called large-scale distributed MIMO)are deployed, the spectral and energy efficiencies can be further improved by using spatial domain multiple access. This paper provides an overview of massive MIMO and large-scale distributed MIMO systems, including spectral efficiency analysis, channel state information(CSI) acquisition, wireless transmission technology, and resource allocation.

关键词： the fifth generation mobile communication massive MIMO large-scale distributed antenna systems spectral efficiency channel state information acquisition multi-user MIMO resource allocation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Site selection of self-driving and recreational vehicle camps in China:An investigation using analytic hierarchy process and entropy

引用

Journal of Traffic and Transportation Engineering(English Edition) 2021年第5期8卷 762-777页

作者： hua Ding Jianwei wang Wenqiang Liao Ting Liang Hong Dai Department of Urban and Rural Planning School of ArchitectureChang'an UniversityXi'an 710064China Institute of Tourism Planning and Design Chang'an UniversityXi'an 710064China Department of Data Management and Application College of Transportation EngineeringChang'an UniversityXi'an 710064China The Sixth Division China Construction&Development Co.Ltd.Tianjin 300451China School of Geological Engineering and Geomatics Chang'an UniversityXi'an 710064China

Self-driving and recreational vehicle(RV)camps are a new form of industry module with the integration of transportation and tourism in China,thus the scientific and reasonable site selection plays an important role in the success of camps’construction and *** terms of relying resources and development factors,camps can be divided into five categories:scenic-spot-based,transportation-based,environment-based,project-based and leisure and *** to whether it is of excludability and competitiveness,the camps in China mainly embody the attribute of private *** on the combination of subjective evaluation and objective calculation,the evaluation model of spatial site selection is constructed and the weight of each index is calculated by using analytic hierarchy process(AHP)method and entropy coefficient *** results show that traffic condition factor is the priority to the selection of campsite,and whether it is on the popular main self-driving route and the grade of trunk roads are the dominant *** second factor taken into consideration is the social factors,in which government policy supports and land cost play a key *** third factor is the market,in which the urban economic level,partnership with the government and tourist resource conditionsare of great *** fourth factor of the campsite selection includes natural elements,in which the quality of ecological environment and water source conditions are mostly *** the future,it is suggested that a camp pattern of"public goods"plus"private goods"should be built and the construction of camps in underdeveloped areas should be highly developed so as to form camp spatial network from individual points to a series of campsite and finally the campsite group in China will be set up.

关键词： Self-driving RV camp Product attribute Site selection Evaluation model AHP Entropy

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

Extending the EMMS/bubbling model to fluidization of binary particle mixture: Formulation and steady-state validation

引用

Chinese Journal of Chemical Engineering 2019年第1期27卷 54-62页

作者： Nouman Ahmad Yujie Tian Bona Lu Kun Hong Haifeng wang wei wang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences University of Chinese Academy of Sciences Jiangsu Provincial Engineering Laboratory for Advanced Materials of Salt Chemical Industry Huaiyin Institute of Technology

The EMMS/bubbling model originally proposed for fluidization of monodisperse particles is extended to fluidization of binary particle mixture in this *** dense and dilute phases are considered to comprise of two types of particles differing in size and/or *** equations and the stability condition are then formulated and solved by using an optimization numerical *** effects of bubble diameter are first investigated and a suitable bubble diameter correlation is *** validation for steady state behavior shows the extended model can fairly capture the overall hydrodynamic behaviors in terms of volume fraction of bubbles and average bed voidage for both monodisperse and binary particle *** encourages us to integrate this model with CFD for more validations in the future.

关键词： EMMS Binary mixture Fluidization Mesoscale structure

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

Synchronized Oscillations in γ Frequency Band in a Neuronal Network

引用

Chinese Physics Letters 1998年第6期15卷 463-465页

作者： wang wei CHEN Guang LIU Feng Department of Physics and Institute for Solid State Physics Nanjing UniversityNanjing 210093

Synchronous oscillation with frequencies in γ band(30-70 Hz),regarded as relevant to the information processing such as scene segmentation,has been numerically studied in a neuronal *** is found that this synchronous oscillation relates to an intrinsic oscillation of the system inγband and this feature is robust to various configurations of external stimuli and couplings.

关键词： oscillation system intrinsic

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

A Novel Zirconium-Based Perovskite-Type Membrane Material for Oxygen Permeation

引用

Chinese Chemical Letters 2001年第9期12卷 835-838页

作者： Jian hua TONG wei Shen YANG Rui CAI Bai Chun ZHU State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of SciencesP.O.Box 110Dalian 116023

A novel zirconium-based membrane material of BaCo0.4Fe0.4Zr0.2O3-6 with cubic perovskite structure was synthesized for the first time through a method of citric and EDTA acid combined complexes. The structural stability was characterized by XRD, O-2-TPD and H-2-TPR techniques respectively. The high oxygen permeation flux of 0.873 mL/cm(2) min at 950 degreesC was obtained under He/Air gradient. Meanwhile, the single activation energy for oxygen permeation and the long-term steady operation of 200 h at 800 degreesC were achieved.

关键词： Perovskite mixed-conducting oxygen separation zirconium

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

Hydrothermal synthesis of manganese oxide encapsulated multiporous carbon nanofibers for supercapacitors

引用

Nano Research 2016年第9期9卷 2672-2680页

作者： Haiyan wang Jiang Deng Yiqing Chen Fan Xu Zhongzhe wei Yong wang Advanced Materials and Catalysis Group ZJU-NHU United R&D CenterCenter for Chemistry of High-Performance and Novel MaterialsDepartment of ChemistryZhejiang UniversityHangzhou 310028China

Hydrothermal carbonization (HTC) of biomass to produce one-dimensional carbon materials with hierarchical pores is of significant importance. Here, we fabricate composites of MnOx-encapsulated multiporous carbon nanofibers (M-MCNFs) from naturally available carbohydrates through a dopamine-assisted HTC/ templating process. The introduction of dopamine aids in the formation of the morphology of carbon nanofibers (CNFs) by enhancing the interactions between the hard-templates and carbohydrates. The chosen cryptomelane hard-templates, which are superior to traditional hard-templates, are converted into Mn3O4nanoparticles embedded in multiporous CNFs (MCNFs), eliminating the need for tedious post deposition procedures to introduce redox active sites. Hence, the obtained hybrids with large surface areas, hierarchical pores, and unique structures show great potential in supercapacitors. This economic and sustainable strategy paves a new way for synthesizing MCNFs and metal oxide-encapsulated MCNFs composites from biomass. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： hydrothermal carbonization multiporous carbon nanofiber manganese oxide encapsulated supercapacitor

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

Cobalt(Ⅱ) and Cadimium(Ⅱ) Metal-organic Frameworks Supported by a Multicarboxylate Ligand

引用

Chinese Journal of Structural Chemistry 2019年第7期38卷 1164-1172页

作者： YANG hua CUI hua-Li wang Ji-Jiang CHEN Xiao-Li Laboratory of New Energy & New Function Materials of Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan?an University

Two metal-organic frameworks(MOFs) of formulae [Co7(L)3(4,4′-BPy)2(OH)2(H2O)6]·-4 H2O(1) and [Cd2(L)(2,2′-BPy)2]n(2, H4L = 5-(3,5-dicarboxybenzyloxy)-isophthalic acid,2,2′-BPy = 2,2?-bipyridine, 4,4′-BPy = 4,4′-bipyridine) were synthesized under solvothermal conditions. The structures of 1 and 2 were characterized by X-ray single-crystal diffraction *** complex 1, six cobalt atoms were connected by oxygen atoms to form a defect dicubane structure. The defect dicubane structures were further linked by Co(4,4?-BPy) units to generate a3-D network structure. Compound 2 displays a 2-D chain structure. The photoluminescent property of complex 2 is investigated. The results show the exclusive luminescence emission bands being originated from intraligand π-π^* transitions.

关键词： metal-organic framework multicarboxylate photoluminescent property

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

Evolution of microstructure and high temperature tensile properties of as-extruded Ti Bw reinforced near-α titanium matrix composite subjected to heat treatments

引用

Science China(Technological Sciences) 2018年第9期61卷 1340-1345页

作者： wang Bo ZHANG HaoBiao huaNG LuJun HE JianLi ZHANG YouFeng wang wei School of Materials Engineering Shanghai University of Engineering Science Shanghai 201620 China Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology Shanghai 201620 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The Ti Bw reinforced near-α titanium matrix composite（Ti-5.8 Al-3.4 Zr-4.0 Sn-0.4 Mo-0.4 Nb-0.4 Si-0.06 C） was successfully synthesized by powder metallurgy and hot extrusion route. The effects of solution and aging temperature on the microstructure and high temperature tensile properties of the composite were investigated. The results revealed that the fine transformed β phase can be obtained by the solution treatment at β phase region and aging treatment, no other precipitates were observed. The α2 phase（Ti3 Al） can be acquired when the solution treated at α＋β phase region followed by aging treatment. With increasing the aging temperature from 500 to 700℃ for 5 h, the size of α2 precipitates increases from about 5 to about 30 nm. The Ti Bw are stable without any interfacial reaction during the heat treatments. The high temperature tensile properties show that the composite performed by solution and aging treatment exhibits good strengthening effects. With increasing the aging temperature from 500 to 700℃, the strength of the composite increases at the expense of elongation due to the increment of α2 *** strength of the composite at 600℃ increases by 17% to 986 MPa after 1000℃/2 h/AC and 700℃/5 h/AC heat treatment.

关键词： titanium matrix composite solution aging precipitate microstrueture high temperature tensile property

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

Advances in the Study of Black Carbon Effects on Climate

引用

Advances in Climate Change Research 2011年第1期2卷 23-30页

作者： hua Zhang Zhili wang National Climate Center China Meteorological Administration Beijing 100081 China Chinese Academy of Meteorological Sciences Beijing 100081 China

Black carbon （BC） aerosols can strongly absorb solar radiation in very broad spectral wavebands, from the visible to the infrared. As a potential factor contributing to global warming, BC aerosols not only directly change the radiation balance of the earth-atmosphere system, but also indirectly affect global or regional climate by acting as cloud conden- sation nuclei or ice nuclei to alter cloud mierophysical properties. Here, recent progresses in the studies of radiative forcing due to BC and its climate effects are reviewed. The uncertainties in current researches are discussed and some suggestions are provided for future investigations.

关键词： black carbon radiative forcing climate effects

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

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：