检索结果-南通市图书馆

International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1755-1769页

作者： wenshen Tang Xinqi Yang Chaobo Tian Yongsheng Xu Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300354China

Single-pass deposits of 6061 aluminum alloy with a single-layer thickness of 4 mm were fabricated by force-controlled friction-and extrusion-based additive *** formation characteristics of the interface,which were achieved by using a featureless shoulder,were investigated and *** microstructure and bonding strength of the final build both with and without heat treatment were explored.A pronounced microstructural heterogeneity was observed throughout the thickness of the final *** at the interface with Cu,{213},and Goss orientations prevailed,which were refined to approximately 4.0μ*** all of the hardening precipitates were dissolved,resulting in the bonding interface displaying the lowest *** fresh layer,subjected to thermal processes and plastic deformation only once,was dominated by a strong recrystallization texture with a Cube *** previous layer,subjected twice to thermal processes and plastic deformation,was governed by P-and Goss-related *** ultimate tensile strength along the build direction in asdeposited and heat-treated states could reach 57.0%and 82.9%of the extruded 6061-T651 aluminum alloy.

关键词： solid-state additive manufacturing aluminum alloy precipitate crystallographic texture heat treatment

在线全文

学校读者我要写书评

暂无评论

电成像在苏里格山西组储层精细描述中的应用

湖北大学学报（自然科学版） 2015年第6期37卷 513-519页

作者：郝骞李武科闫丽郝晋美赵占良石林辉王文胜中国石油长庆油田苏里格气田研究中心陕西西安710018 低渗透油气田勘探开发国家工程实验室陕西西安710018 中国石油长庆油田第三采气厂陕西西安710018

应用电成像深入探讨苏里格气田某区块山西组储层裂缝类型、分布及其与试气效果之间的关系，识别并建立更为精细的沉积微相模型，解释古水流方向，开展综合性的沉积环境精细描述以还原地下储层真实沉积特征，加深对非常规天然气储层的认... 详细信息

应用电成像深入探讨苏里格气田某区块山西组储层裂缝类型、分布及其与试气效果之间的关系，识别并建立更为精细的沉积微相模型，解释古水流方向，开展综合性的沉积环境精细描述以还原地下储层真实沉积特征，加深对非常规天然气储层的认识和开发能力．研究表明，山西组储层多见天然裂缝，裂缝倾角分布在45°～90°之间，走向分布在75°～256°之间，在电成像板状交错层理砂体前积方向指示古水流方向分析的基础上，结合三维地震和重要电性参数综合分析，明确低渗气藏在强水动力、气测饱满、砂体电性及物性响应好的配置下，发育天然裂缝的储层捕获高产气井的几率较大．

关键词：苏里格电成像山西组储层精细描述裂缝分析古水流方向

Removal of Basic and Non-Basic Nitrogen Compounds from Model Oil by FeCl_(3)-Based Ionic Liquids

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2022年第4期24卷 86-92页

作者： Li wenshen Liu Jie School of Petrochemical Engineering Liaoning Petrochemical UniversityFushun 113001China

The low-viscosity FeCl_(3)-based ionic liquids(ILs)prepared from the interaction of anhydrous FeCl_(3) and alkyl imidazolium bromide([1-alkyl-3-methyl-imidazolium]Br,alkyl=ethyl,butyl,hexyl,octyl)are highly effective for the denitrogenation of model oil containing quinoline or *** results indicate that the chain length of the alkyl group on the imidazolium cation has little influence on the N-extraction *** the selected IL[Bmim]Br/FeCl_(3),up to 99.1%of N-extraction efficiency from model oil containing quinoline can be attained at an extraction temperature of 30°C with an IL/oil mass ratio of 1/7 and an extraction time of 30 *** indole extraction efficiency reaches 98.9%at an IL/oil mass ratio of 1:***,the quinoline extraction efficiency remains as high as 92.3%after the IL has been recycled four times.

关键词： FeCl_(3)-based ionic liquid denitrogenation quinoline indole

A comparative study of seismic provisions between International Building Code 2003 and Uniform Building Code 1997

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2006年第1期5卷 49-60页

作者： wenshen Pong Zu-Hsu Lee Anson Lee School of Engineering San Francisco State University San Francisco CA 94132 USA Department of Management and Information Systems Montclair State University Montclair NJ 07043 USA

This study focuses on the comparison of the Uniform Building Code （UBC） 1997 and International Building Code （IBC） 2003 in relation to the seismic design and analysis of special steel moment resisting frame buildings （SMRF）. This paper formulates a numerical study of a steel SMRF building, studied in four different situations, namely： as an office building in San Francisco; as an office building in Sacramento; as an essential facility in San Francisco, and as an essential facility in Sacramento. The analytical results of the model buildings are then compared and analyzed taking note of any significant differences. This case study explores variations in the results obtained using the two codes, particularly the design base shear and drift ratios as they relate to different locations and occupancy use. This study also proves that IBC 2003 is more stringent for the redundancy factor under design category E for the SMRF building, and drift limits for essential facilities.

关键词： Uniform Building Code 1997 International Building Code 2003 building periods special moment resisting frame redundancy factor

The marine environmental evolution in the northern Norwegian Sea revealed by foraminifera during the last 60 ka

在线全文

学校读者我要写书评

暂无评论

Advances in Polar Science 2021年第3期32卷 210-220页

作者： wang Weiguo ZHAO Mengwei YANG Jichao XIAO wenshen wang Haoyin LIU Yang Third Institute of Oceanography Ministry of Natural ResourcesP.R.C.Xiamen 361005China Pilot National Laboratory for Marine Science and Technology Qingdao 266237China Shandong University of Science and Technology Qingdao 266590China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China School of Marine Science and Technology Hainan Tropical Ocean UniversitySanya 572000China School of Earth Sciences Lanzhou UniversityLanzhou 730000China

Both planktonic and benthic foraminifera were identified in a sediment core collected from the northern Norwegian Sea to reconstruct the paleoceanographic evolution since the last *** assemblages and distribution patterns of dominant foraminiferal species with special habitat preferences indicated that three marine environments occurred in the northern Norwegian Sea since 62 ka BP:(1)an environment controlled by the circulation of the North Atlantic Current(NAC);(2)by polynya-related sinking of brines and upwelling of intermediate water surrounding the polynya;(3)by melt-water from Barents Sea Ice Sheet(BSIS).At 62-52.5 ka BP,a period with the highest summer insolation during the last glaciatial period,intensification of the NAC led to higher absolute abundances and higher diversity of foraminiferal *** higher abundance of benthic species Cibicidoides wuellerstorfi indicates bottom water conditions that were well-ventilated with an adequate food supply;however,higher abundances of polar planktonic foraminiferal species Neogloboquadrina pachyderma(sin.)indicate that the near-surface temperatures were still *** mid-late Marine Isotope Stage(MIS)3(52.5-29 ka BP),the marine environment of the northern Norwegian Sea alternately changed among the above mentioned three *** 29-17ka BP during the last glacial maximum,the dominant benthic species Bolivina arctica from the Arctic Ocean indicates an extreme cold bottom *** BSIS expanded to its maximum extent during this period,and vast polynya formed at the edge of the ice *** sinking of brines from the formation of sea ice in the polynyas caused upwelling,indicated by the upwelling adapted planktonic species Globigerinita *** 17-10 ka BP,the northern Norwegian Sea was controlled by *** the ablation of BSIS,massive amounts of melt water discharged into the Norwegian Sea,resulting in strong water column stratification,poor ventilation,and an oligotrophic

关键词： Norwegian Sea foraminifera North Atlantic Current Barents Sea Ice Sheet marine environments last glaciation

Ice rafting history and paleoceanographic reconstructions of Core 08P23 from southern Chukchi Plateau, western Arctic Ocean since Marine Isotope Stage 3

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2015年第3期34卷 68-75页

作者： ZHANG Taoliang wang Rujian XIAO wenshen CHEN Zhihua CHEN Jianfang CHENG Zhenbo SUN Yechen State Key Laboratory of Marine Geology Tongji University The First Institute of Oceanography State Oceanic Adiministration The Second Institute of Oceanography State Oceanic Adiministration

Multiproxy investigations have been performed on Core 08P23 collected from the Chukchi Plateau, the western Arctic Ocean, during the Third Chinese National Arctic Expedition. The core was dated back to Ma-rine Isotope Stage （MIS） 3 by a combination of Accelerator Mass Spectrometric （AMS） carbon-14 dating and regional core correlation. A total of five prominent ice-rafted detritus （IRD） events were recognized in MIS 2 and MIS 3. The IRD sources in MIS 3 are originated from vast carbonate rock outcrops of the Canadian Arctic Archipelago and clastic quartz in MIS 2 may have a Eurasian origin. Mostδ18O andδ13C values of Neogloboquadrina pachyderma （sinistral）（Nps） in Core 08P23 are lighter than the average values of surface sediments. The lighterδ18O andδ13C values of Nps in the two brown layers in MIS 1 and MIS 3 were resulted from meltwater events; and those in the gray layers in MIS 3 were caused by the enhanced sea ice formation. Theδ18O values varied inversely withδ13C in MIS 2 indicate that the study area was covered by thick sea ice or ice sheet with low temperature and little meltwater, which prevented the biological productivity and sea-atmosphere exchange, as well as water mass ventilation. The covaried light values ofδ18O andδ13C in MIS 1 and MIS 3 were resulted from meltwater and/or brine injection.

关键词： Chukchi Plateau western Arctic Ocean Marine Isotope Stage 3 ice rafted detritus events oxygen and carbon isotope water mass changes

Removal of Nitride from Shale Diesel Fraction with FeCl3-Based Ionic Liquids

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2019年第3期21卷 46-52页

作者： Liu Jie Liu Jinbo Li wenshen College of Chemistry Chemical Engineering and Environmental Engineering Liaoning Shihua University

FeCl3-based ionic liquid [Bmim]Br/FeCl3 with lower viscosity was synthesized and its structure was character-ized with FT-IR spectroscopy. The denitrogenation performance of the ionic liquid was investigated using the Fushun shale diesel fraction with high nitrogen content. Experimental results showed that the ionic liquid presented good denitrogenation performance and the basic N and total N removal efficiency can reach 95.29% and 89.77% under conditions covering a tem-perature of 30 ℃, an IL/oil mass ratio of 1:1, an extraction time of 30 min, and a settling time of 2 h. Correspondingly, the basic N and total N contents in shale diesel fraction dropped from the original 5454 μg/g and 9832 μg/g to 257 μg/g and 1006 μg/g, respectively. In addition, the basic-N removal efficiency can still reach 60% at an IL/oil mass ratio of 1:7 during four recycles of the ionic liquid.

关键词： [Bmim]Br/FeCl3 ionic liquid shale diesel fraction denitrogenation

Bitumen Recovery from Indonesian Oil Sands Using ASP(Alkali, Surfactant and Polymer) Agent

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2018年第1期20卷 110-115页

作者： Li wenshen Guo Xiaowen Liu Jie College of Chemistry Chemical Engineering and Environmental Engineering Liaoning Shihua University

A self-developed ASP agent was used to separate bitumen from Indonesia's oil sands by its comprehensive effect and the separation condition was well investigated. The bitumen extraction conditions for industrial application were recommended to cover a mixing temperature of 80℃, a mixing time of 40 min, a mass ratio of ASP agent to oil sands of 4:10, and a floating time of 10 min. Under the above conditions, the bitumen recovery was about 86% and the residual bitumen content in tailings was about 6%. The relationship between the residual bitumen content and the particle size of tailings was studied in order to find the way to reducing the residual bitumen content in tailings. The results showed that the residual bitumen content in tailings decreased with a decreasing tailings particle size. After being milled for 30 min with a mortar, the tailings was reprocessed via extraction by means of the ASP agent, and the residual bitumen content in tailings decreased from 5.47% to 1.25%, which could comply with the disposal requirements.

关键词： oil sands bitumen recovery ASP agent tailings milling

Quaternary biogenic opal records in the South China Sea: Linkages to East Asian monsoon, global ice volume and orbital forcing

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2007年第5期50卷 710-724页

作者： wang RuJian JIAN ZhiMin XIAO wenshen TIAN Jun LI JianRu CHEN RongHua ZHENG YuLong CHEN JianFang State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China

Particulate fluxes investigated in the central South China Sea (SCS) during 1993―1996 indicate that opal flux can be used to show primary productivity change, which provides a foundation for tracing the evolutionary relationship between the surface productivity and East Asian monsoon in the SCS during the late Quaternary glacial and interglacial periods. Based on the studies of opal % and their mass accumulation rates (MAR) at the six sites recovered from the SCS during the “Resolution” ODP Leg 184 and “Sonne” 95 cruise of the Sino-Germany cooperation, opal % and their MARs increased evidently in the northern sites since 470―900 ka, and they enhanced and reduced, respectively, during the glacial and interglacial periods. Whereas they increased obviously in the southern sites since 420―450 ka, and they augmented and declined, respectively, during the interglacial and glacial periods. The vari- ability in opal % and their MARs in the late Quaternary glacial cyclicity indicate the “seesaw” pattern of surface productivity in the SCS. The winter monsoon intensified during the glacial periods, surface productivity increased and decreased, respectively, in the northern and southern SCS. The summer monsoon strengthened during the interglacial periods, surface productivity increased and decreased, respectively, in the southern and northern SCS. The cross spectral analyses between the opal % in the northern and southern SCS during the Quaternary and global ice volume (δ 18O) and orbital forcing (ETP) indicate that the East Asian winter and summer monsoons could be ascribed to the different drive mechanisms. On the orbital time scale, the global ice volume change could be a dominant factor for the winter monsoon intension and temporal variations. As compared with the winter monsoon, the correlative summer solar radiation with the obliquity and precession in the Northern Hemisphere could be a mostly controlling factor for the summer monsoon intension and temporal variations.

关键词： biogenic opal surface productivity East Asian monsoon global ice volume orbital forcing ODP Leg 184 Quaternary South China Sea

Productivity in the Southern Ocean Antarctic Zone during the Northern Hemisphere Glaciation(NHG)and its link to atmospheric pCO_(2)

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第7期67卷 2242-2252页

作者： Yiming WU Jingteng GUO Xiangyu ZHAO wenshen XIAO Heng LIU Zhifang XIONG Tiegang LI Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Key Laboratoryof Polar Ecosystem and Climate Change Shanghai Jiao Tong UniversityMinistry of EducationShanghai 200030China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

A decrease in atmospheric CO_(2)partial pressure(pCO_(2))is considered an important prerequisite for the onset and intensification of Northern Hemisphere Glaciation(NHG).However,how the ocean sequestered missing CO_(2)during the NHG is still *** in surface productivity and deep ventilation in the Southern Ocean(SO)have been proposed to explain the variations in atmospheric pCO_(2)over the last eight glacial cycles,but it is unclear whether these mechanisms contributed to the decrease in atmospheric pCO_(2)during the *** titanium-normalized contents and mass accumulation rates of biogenic opal and total organic carbon from the International Ocean Discovery Program(IODP)Expedition 374 Site U1524A,we reconstruct the productivity in the Ross Sea,Antarctica,from 3.3 Ma to 2.4 *** productivity records exhibit a long-term decreasing trend and several distinct phased evolutionary ***,the local productivity fluctuated dramatically during 3.3-3.0 Ma,decreased gradually during 3.0-2.6 Ma,and remained relatively constant during 2.6-2.4 *** comparing productivity with its potential influences,we infer that the phased and long-term evolutions of productivity were mainly controlled by changes in deep ocean *** ice expansion might have decreased productivity during 3.3-3.0 Ma by light *** in eolian dust input have little effect on *** analysis revealed no coupling linkage between productivity and atmospheric pCO_(2),indicating that the productivity in the SO Antarctic Zone(AZ)was not the main factor controlling the atmospheric CO_(2)decrease during the *** improve our understanding of the role of SO processes in the NHG,further studies should focus on the potential influences of deep ocean ventilation on atmospheric pCO_(2)in the AZ,and similar studies should also be extended to the sea area in the Subantarctic Zone.

关键词： Ross Sea Biogenic opal Total organic carbon Deep ocean ventilation Sea ice Ocean carbon cycle