检索结果-南通市图书馆

New process development and process evaluation for capturing CO2 in flue gas from power plants using ionic liquid[emim][Tf2N]

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

Chinese Journal of Chemical Engineering 2020年第3期28卷 721-732页

作者： lan li Xiaoting Huang Quanda Jiang Luyue Xia Jiawei Wang Ning Ai College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Province Key Laboratory of Biomass Fuel Hangzhou 310014China Biodiesel Laboratory of China Petroleum and Chemical Industry Federation Hangzhou 310014China Zhejiang Supcon Software Co. LtdHangzhou 310014China School of Engineering&Applied Science Aston UniversityBirmingham B47ETW MidlandsEnglandUK

Using the ionic liquid[emim][Tf2N]as a physical solvent,it was found by Aspen Plus simulation that it was possible to attempt to capture CO2 from the flue gas discharged from the coal-fired unit of the power *** the combination of model calculation and experimental determination,the density,isostatic heat capacity,viscosity,vapor pressure,thermal conductivity,surface tension and solubility of[emim][Tf2N]were *** on the NRTL model,the Henry coefficient and NRTL binary interaction parameters of CO2 dissolved in[emim][Tf2N]were obtained by correlating[emim][Tf2N]with the gas–liquid equilibrium data of ***,the calculated relevant data is imported into Aspen Plus,and the whole process model of the ionic liquid absorption process is *** the absorption process is optimized according to the temperature distribution in the absorption tower to obtain a new absorption ***,the density,constant pressure heat capacity,surface tension,thermal conductivity,and viscosity of[emim][Tf2N]were changed to investigate the effect of ionic liquid properties on process energy consumption,solvent circulation and heat exchanger *** results showed that based on the composition of the inlet gas stream to the absorbers,CO2 with a capture rate of 90%and a mass purity higher than 99.5%was *** results indicate that the[emim][Tf2N]could be used as a physical solvent for CO2 capture from coal-fired *** addition,the results will provide a theoretical basis for the design of new ionic liquids for CO2 capture.

关键词： Ionic liquids CO2 capture Aspen Plus process simulation New green physical solvents Flue gas

Additive manufacturing of copper-stainless steel hybrid components using laser-aided directed energy deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第21期80卷 100-116页

作者： Xinchang Zhang Tan Pan Yitao Chen lan li Yimlu Zhang Frank liou Department of Mechanical&Aerospace Engineering Missouri University of Science and TechnologyRollaMO65409USA

Combining dissimilar materials in a single component is an effective solution to integrate diverse material properties into a single ***-stainless steel hybrid components are attracting more and more attention since the high thermal conductivity of copper can greatly enhance the thermal performance of stainless steel,which benefits its applications in many ***,direct joining of copper and stainless steel such as SS316 L is challenging since they preserve significant dissimilarities in physical,chemical,and thermo-mechanical *** paper aims to fabricate well-bonded copper-SS316 L hybrid parts using a laser-aided directed energy deposition(DED) process.A nickel-based alloy Deloro22(D22) is introduced between copper and SS316 L to address the detrimental issues in copper-SS316 L direct *** this technique,defect-free interfaces are achieved at both the D22-SS316 L and copper-D22 transition *** testing of Cu-D22-SS316 L and D22-SS316 L hybrid parts shows the fracture occurs at pure copper and SS316 L region,respectively,indicating an excellent bonding at the *** in the building direction,a transition of grain structure is observed.A significant diffusion zone is obtained at both the D22-SS316 L and the Cu-D22 *** large diffusion distance results in a smooth variation in microhardness over the dissimilar *** microhardness increases from SS316 L to D22 with the highest value of 240 HV and then decreases from D22 to Cu with the lowest value of 63 ± 4 *** of thermophysical properties of the Cu-D22-SS316 L system indicates there is a ~300 % increase in thermal diffusivity and a ~200 % increase in thermal conductivity when compared to pure SS316 *** significant increase in thermal diffusivity and conductivity validates the enhanced thermal performance of SS316 L when it is joined with pure copper.

关键词： Additive manufacturing Directed energy deposition Multi-material components Dissimilar materials Copper Stainless steel

Effects of 1,9-dibromnonane on the structural, photophysical properties and stability of cesium lead bromide perovskite nanocrystals

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第8期36卷 84-91页

作者： Zhaojun Mo Qiujie Lu Zhihong Hao Zhexuan Zheng Fu Qiu Xiao Yang Zhenyu li lan li School of Material Science and Engineering Institute of Material PhysicsKey Laboratory of Display Materials and Photoelectric Devices of Ministry of Education of Ministry of EducationKey Laboratory for Optoelectronic Materials and Devices of TianjinTianjin University of TechnologyTianjin 300191China Tianjin Vocational Institute Tianjin 300350China

The CsPbBr3@Cs4PbBr6 nanocrystals(NCs) could be synthesized by multiple Cs-oleate injections as adding the 1,9-dibromnonane in the reaction solution. The 1,9-dibromnonane could provide Br-ions and the rich Br-ions effectively restrain the generation of Cs Br. The Cs4 PbBr6 wrapped around the Cs Pb Br3 NCs and the size of crystalline grain was increased with increasing the Cs-oleate as excess oleylamine. The quantum yield for 14 S4 DN reached to 99.3% due to the decrease of defects and the surface passivation of Cs4 PbBr6. There are more oleylammonium bromide on the surface of Cs Pb Br3 NCs as synthesized with1,9-dibromnonane. The ligand shell and the surface passivation of Cs4 PbBr6 restrained the decomposition of surface, consequently improved the stability of moisture and light for Cs Pb Br3 NCs. When the CsPbBr3@Cs4PbBr6 NCs were immersed in water under UV light(365 nm) for 2 h, the PL intensity could retain 90.4%, while the 11 S1(traditional Cs Pb Br3 NCs) was only 10.9%. It indicated the stability of moisture and light for Cs Pb Br3 NCs were greatly improved, because Cs4 PbBr6 NCs effectively passivated the surface of Cs Pb Br3 NCs and restrained the generation of traps states.

关键词： Perovskite Nanocrystals Luminescence Stability

Reference evapotranspiration concentration and its relationship with precipitation concentration at southern and northern slopes of Tianshan Mountains, China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2019年第6期16卷 1381-1395页

作者： HUANG Fa-rong YANG Tao li Qian li Si-si li lan-hai Suwannee ADSAVAKULCHAI State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Ili station for Watershed Ecosystem Research Chinese Academy of SciencesXinyuan 835800China Research Center for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China School of Engineering University of the Thai Chamber of CommerceBangkok 10400Thailand

The investigation of concentration characteristics of reference evapotranspiration(ETref) is important for water resources management. The concentration index(CI), concentration degree(CD) and concentration period(CP) are used to investigate the concentration characteristics of ETref and the relationship between ETref concentration and precipitation concentration at sub-monthly timescale based on the daily climatic variables from 1966 to 2015 in 27 meteorological stations at the southern and northern slopes of Tianshan Mountains in China. It was found that the CI of ETref is about 0.40 and less concentrated than precipitation in the study area. At the southern slope, the maximum ETref appears in late June and is earlier than the maximum precipitation(early July), ETref distributes more equally than precipitation, and the CI, CD and CP of these two variables do not show significant change based on the Mann–Kendall test. At the northern slope, both the maximum ETref and precipitation appear in early July, and ETref is more dispersed than precipitation. During the study period, the maximum ETref at the northern slope tends to appear earlier due to the impacts of wind speed, relative humidity, sunshine duration, and air temperature. ETref concentration does not match the precipitation concentration in the study area, particularly at the southern slope. The mismatch between ETref and precipitation concentration within a year reveals the water resources pressure on environmental, social and economic sustainability in the study area.

关键词： Concentration Reference evapotranspiration Precipitation Trend analysis Tianshan Mountains

Is short-term therapy really sufficient to eradicate Helicobacter pylori infection?

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第9期11卷 690-701页

作者： Ning ZHOU Wei-xing CHEN WeiZHANG lan li Xi JIN You-ming li Department of Gastroenterology the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective:The aim of our study was to perform a systematic review and meta-analysis of the efficacy of short-term protocols for Helicobacter pylori eradication and to review the safety and adverse profiles of these eradication ***:literatures were located through electronic searches by PubMed,Medline,ISI Web of Knowledge,and Cochrane library using the relevant *** of important meetings were searched manually in some journal *** bibliographies were identified from the reference lists of identified *** independent reviewers systemically identified randomized controlled trials(RCTs) comparing short-duration protocols vs.7-d proton pump inhibitor(PPI)-based triple protocols,as well as studies reporting eradication rates of short-duration protocols for *** effect size was calculated as relative risk(RR) and 95% confidence intervals(CI) using Review Manager 4.2,and Plightly fewer adverse-effects were found in short-term ***:Although more economical,short-duration protocols are inferior to 7-d PPI-based triple protocols with regarding to eradication rate of *** of more than 3 d,however,may be equivalent to 7-d protocols.

关键词： Helicobacter pylori Eradication therapy Short-term Meta-analysis Adverse effects

GFAP and Fos immunoreactivity in lumbo-sacral spinal cord and medulla oblongata after chronic colonic inflammation in rats

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第31期11卷 4827-4832页

作者： Yi-Ning Sun Jin-Yan Luo Zhi-Ren Rao li lan li Duan Department of Gastroenterology The Second Hospital of Xi'an Jiaotong University Xi'an 710004 Shaanxi Province China Department of Neurosciences the Fourth Military Medical University Xi'an 710032 Shaanxi Province China

AIM： To investigate the response of astrocytes and neurons in rat lumbo±sacral spinal cord and medulla oblongata induced by chronic colonic inflammation, and the relationship between them. METHODS： Thirty-three male Sprague-Dawley rats were randomly divided into two groups： experimental group （n = 17）, colonic inflammation was induced by intra-luminal administration of trinitrobenzenesulfonic acid （TNBS）; control group （n = 16）, saline was administered intra-luminally. After 3, 7, 14, and 28 d of administration, the lumbo-sacral spinal cord and medulla oblongata were removed and processed for anti-glial fibrillary acidic protein （GFAP）, Fos and GFAP/Fos immunohistochemistry. RESULTS： Activated astrocytes positive for GFAP were mainly distributed in the superficial laminae （laminae Ⅰ-Ⅱ） of dorsal horn, intermediolateral nucleus （laminae Ⅴ）, posterior commissural nucleus （laminae Ⅹ） and anterolateral nucleus （laminae Ⅸ）. Fos-IR （Fos-immunoreactive） neurons were mainly distributed in the deeper laminae of the spinal cord （laminae Ⅲ-Ⅳ, Ⅴ-Ⅵ）. In the medulla oblongata, both GFAP-IR astrocytes and Fos-IR neurons were mainly distributed in the medullary visceral zone （MVZ）. The density of GFAP in the spinal cord of experimental rats was significantly higher after 3, 7, and 14 d of TNBS administration compared with the controls （50.44±16.8, 29.24±6.5, 24.14±5.6, P〈0.05）. The density of GFAP in MVZ was significantly higher after 3 d of TNBS administration （34.34±2.5, P〈0.05）. After 28 d of TNBS administration, the density of GFAP in the spinal cord and MVZ decreased and became comparable to that of the controls （18.04±4.9, 14.64±6.4, P〉0.05）. CONCLUSION： Astrocytes in spinal cord and medulla oblongata can be activated by colonic inflammation. The activated astrocytes are closely related to Fos-IR neurons. With the recovery of colonic inflammation, the activity ofastrocytes in the spinal cord and medulla oblongata is reduced.

关键词： Animals Astrocytes Chronic Disease Colonic Diseases Glial Fibrillary Acidic Protein Inflammation Male Medulla Oblongata Proto-Oncogene Proteins c-fos Rats Rats, Sprague-Dawley Spinal Cord Trinitrobenzenesulfonic Acid

Spatio-temporal variation of spring phenology in Tibetan Plateau and its linkage to climate change from 1982 to 2012

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

Journal of Mountain Science 2016年第1期13卷 83-94页

作者： DING Ming-jun li lan-hui NIE Yong CHEN Qian ZHANG Yi-li Key Laboratory of Poyang Lake Wetland and Watershed Research Ministry of Education and School of Geography and EnvironmentJiangxi Normal UniversityNanchang 330022China Key Laboratory of land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China

The influence of climate change on vegetation phenology is a heated issue in current climate change *** used GIMMS-3g NDVI data to detect the spatio-temporal dynamics of the start of the growing season(SGS) over the Tibetan Plateau(TP) from 1982 to 2012 and to analyze its relationship with temperature and *** significant trend was observed in the SGS at the regional scale during the study period(R^2 = 0.03,P = 0.352).However,there were three time periods(1982-1999,1999-2008 and 2008-2012) with identifiable,distinctly different *** with a significant advancing trend were mainly scattered throughout the humid and semi-humid areas,whereas the regions with a significant delaying trend were mostly distributed throughout the semi-arid *** analysis showed that the response of the SGS to climate change varies *** SGS was significantly correlated with the spring temperature and the start of the thermal growth season(STGS) in the relatively humid *** increasing aridity,theimportance of the spring temperature for the SGS gradually ***,the influences of precipitation and winter temperature on the SGS were complicated across the plateau.

关键词： Spring phenology Spatial pattern Temporal variation Climate change CorrelationTibetan Plateau (TP)

Preparation and characterization of Fe_(2)O_(3)/Bi_(2)WO_(6)composite and photocatalytic degradation mechanism of microcystin-LR

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2021年第2期14卷 109-118页

作者： li-xiao Ni Cun-hao Du Han-qi Wu Yan li Xiang-lan li Chu Xu Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China

The long-standing popularity of semiconductor photocatalysis,due to its great potential in a variety of applications,has resulted in the creation of numerous semiconductor photocatalysts,and it stimulated the development of various characterization *** this study,Fe_(2)O_(3)/Bi_(2)WO_(6)composite with a flower-like microsphere and hierarchical structure was synthesized with the facile hydrothermal-impregnation method without any surfactants.X-ray diffraction(XRD),scanning electron microscopy(SEM),ultravioletevisible(UV-Vis)diffuse reflectance spectroscopy,and photoluminescence spectroscopy were used to characterize the structures of the *** specific surface area was estimated with the Brunauer-Emmett-Teller(BET)method,and pore size distribution was determined using the Barrett-Joyner-Halenda(BJH)*** synthesized Fe_(2)O_(3)/Bi_(2)WO_(6)composite had an average diameter of approximately 4 nm,with smaller specific surface area and larger pore diameter than those of pristine Bi_(2)WO_(6).The results of XRD and SEM analyses confirmed that the composite was composed of Fe_(2)O_(3)and Bi_(2)WO_(6).The absorption edge of Bi_(2)WO_(6)was at a wavelength of 460 *** contrast,the absorption edge of Fe_(2)O_(3)/Bi_(2)WO_(6)to visible light was redshifted to 520 nm,with narrower bandgap width and stronger visible light *** was also found that the main active substances in the degradation of microcystin-LR(MC-LR)were hydroxyl radicals(·OH)and electron holes(h^(+)).Consequently,the results further showed that the heterojunction between Fe_(2)O_(3)and Bi_(2)WO_(6)can improve the charge transfer rate and effectively separate the photoinduced electrons and *** with Bi_(2)WO_(6),Fe_(2)O_(3)/Bi_(2)WO_(6)had no significant difference in the adsorption capacity of MC-LR and had more efficient photocatalytic degradation activity of *** degradation rates of MC-LR by Fe_(2)O_(3)/Bi_(2)WO_(6)and Bi_(2)WO_(6)reached 80%and 56%,*** d

关键词： Photocatalysis Composite photocatalyst Fe_(2)O_(3)/Bi_(2)WO_(6) Bi_(2)WO_(6) MC-LR

Resource scheduling virtualization in service-oriented future Internet architecture

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2015年第4期22卷 92-100页

作者： li lan Chen Jianya Cui Hongyan Huang Tao liu Yunjie State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Service-oriented future internet architecture（SOFIA） is a clean-slate network architecture. In SOFIA, a service request is mainly processed through service resolution and network resource allocation. To realize the network resource allocation, we reference the idea of network virtualization and propose resource scheduling virtualization. In resource scheduling virtualization, a service request is abstracted as a virtual network（VN） and the network resources are allocated by mapping the VN onto the physical network. Resource scheduling virtualization provides centralized resource scheduling control within an autonomous system（AS） and achieves better controllability compared with the distributed schemes. Besides, resource scheduling virtualization supports multi-site selection as well. Meanwhile, we propose a collection of resource scheduling algorithms based on maximum resource tree（MRT） adapting to different scenarios. According to the simulation results, the proposed algorithms show good performance on the key metrics, such as acceptance ratio, revenue, cost and utilization. Moreover, the simulation results reveal that our algorithm is more efficient than the traditional ones.

关键词： SOFIA resource scheduling virtualization virtual network embedding maximum resource tree(MRT)