检索结果-南通市图书馆

Petroleum Science 2008年第1期5卷 20-23页

作者： yang Minghui liu Chiyang Tang xuan Zheng Xiaofeng Basin ＆ Reservoir Research Center Key Laboratory of Hydrocarbon Accumulation Ministry of Education ChinaUniversity of Petroleum Beijing 102249 China Department of Geology Northwest University Xi＇an 710069 Shaanxi China Department of Energy Geology China University of Geosciences Beijing 100083 China

The carbon isotope δ 13C value of dispersed organic matter in the Upper Triassic sediments in the Ordos basin is （-24.5 to -26.6） ×10^-3 with the carbon being derived from C3-1ike pleustons. The paleoclimate of the Late Triassic, especially during the deposition of the Chang 7 member, was characterized by a hot and humid climate. It underwent four small climate cycles from humid and warm to humid and hot.

关键词： Paleoclimate stable carbon isotope dispersed organic material Yanchang Formation Ordos basin

Efficient and green tetrahydropyranylation and deprotection of alcohols and phenols by using activated carbon supported sulfuric acid

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第8期19卷 893-896页

作者： Jin Hui yang xuan Zhang Wan Yi liu Key Laboratory of Energy Sources ＆ Engineering Ningxia University Yinchuan 750021 China School of Chemistry and Chemical Engineering Ningxia University Yinchuan 750021 China

A simple, green and efficient method for the DHP protection of various alcohols and phenols and the subsequent removal of the corresponding protective group in the presence of a catalytic amount of the activated carbo... 详细信息

关键词： Tetrahydropyranylation Deprotection THP ethers Activated carbon

Sequence framework of two different kinds of margins and their response to tectonic activity during the Middle-Late Triassic,Ordos Basin

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2007年第Z2期50卷 203-216页

作者： yang MingHui liu Chiyang ZHENG MengLin LAN ChaoLi TANG xuan Key Laboratory for Hydrocarbon Accumulation of Education Ministry in China University of Petroleum Basin and Reservoir Research CenterChina University of PetroleumBeijing 102249China State Key Laboratory of Continental Dynamics(Northwest University) Xi'an710069China Exploration&Production Research Institute SINOPECBeijing 100083China School of Engineering of Oil&Gas China University of PetroleumBeijing 102249China School of Energy China University of GeosciencesBeijing 100083China

Two kinds of margin respectively occur in the Ordos Basin during the Middle-Late Triassic(Yanchang Age),one is foreland margin developed under the background of flexural subsidence by thrusting intensively in the southwest margin,and the other is intracratonic basin margin by stable subsidence in northern and central parts of the *** Middle-Late Triassic Yanchang Formation can be divided into four regional third-order sequences,which are separated by gentle angular unconformity or regional erosion surface,made up of lowstand system tract(LST),expanding system tract(EST)and highstand system tract(HST)from lower to upper within a *** there are distinct differences of the sequence framework between the southwest margin and northern and central parts of the *** southwest margin develops heavy conglomerate layer and unconformity as a result of orogeny by thrusting,and the intracratonic basin margin by stable subsidence in the northern and central parts grows aggradational sandstone,conglomerate in fluvio-delta system and parallel *** depositional framework of southwest margin reflects the tectonic evolution from flexural subsidence by thrusting to rebounded *** formation of sequence boundary is related to the resilient uplift and *** sequence stratigraphic framework and depositional system tract configuration in the foreland basin are controlled by structural activity of the fold and thrust belt,and the sequence succession reflects episodic thrusting of the Middle-Late Triassic toward the foreland *** sequence evolution in northern and central parts reflects the depositional succession of fluvio-delta system under intracratonic background,composed of coarse-grained sediment in braided channel deposit at the lower,meandering channel deposit in the middle and fine-grained sediment in the flood plain at the upper,dominated by lake level *** the deposit of the LST in the intracraton basin,accommodation spa

关键词： sequence architecture tectonic response basement structure the Middle-Late Triassic(Yanchang Age) Ordos Basin

Supramolecular Vesicles Based on Water-Soluble 2,6-Helic[6]arene:High Affinity Binding,Stimuli Responsiveness and Delivery of Doxorubicin to Cancer Cells

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 Chemistry 2019年第6期37卷 575-580页

作者： xuan yang Weipeng Mao Yamin liu Libai Li Da Ma Department of Chemistry Fudan University220 Handan RoadShanghai 200433China

Water-soluble 2,6-helic[6]arene was used to construct supramolecular vesicles via host-guest interaction. Water-soluble 2,6-helic[6]arene was discovered to be high affinity host for suitable biomarkers. Supramolecular vesicles were responsive to multiple stimuli types, including temperature, pH, Ca^2+, CO2 bubbling and biomarker displacement. Supramolecular vesicles were used to load and deliver anti-tumor drug doxorubicin to HeLa cells in vitro.

关键词： host-guest systems nanostructures molecular recognitions self-assembly supramolecular vesicles

Otolith microchemical evidence revealing multiple spawning site origination of the anadromous tapertail anchovy(Coilia nasus)in the Changjiang(yangtze)River Estuary

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2023年第1期42卷 120-130页

作者： Zhongya xuan Tao Jiang Hongbo liu Xiubao Chen Jian yang Wuxi Fisheries College Nanjing Agricultural UniversityWuxi214081China Key Laboratory of Fishery Ecological Environment Assessment and Resource Conservation in Middle and Lower Reaches of the yangtze River Freshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi214081China

The estuarine tapertail anchovy(Coilia nasus)is a high-value commercial *** the spawning site or hatchery origin and habitat is essential for its *** study aimed to determine the habitat use and life history characteristics of *** from the Changjiang River *** investigated the environmental signatures of strontium(Sr)and calcium(Ca)in the otoliths of the collected specimens using electron probe microanalysis;additionally,we examined their gonadal maturity *** results indicate that the 31 adult *** specimens used in this study could be classified into two types based on their otolith Sr:Ca concentration ratios and their gonadal maturity *** long freshwater early life history type(Type LF)had wider central region in the otolith with low Sr:Ca concentration ratios ranging from 1.24±0.62 to 1.92±0.78 and a bluish pattern of low Sr content *** fish are of riverine origin and had a relatively long early life history in freshwater and low gonadal maturation when *** short freshwater early life history type(Type SF)had a shorter central region in the otolith with low Sr:Ca concentration ratios ranging from 1.35±0.5 to 2.82±0.97 and a correspondingly bluish *** fish also had a relatively short-term early life history in freshwater and high gonadal maturation when *** results of the otolith microchemical analysis indicated that Type LF and Type SF originated in spawning/hatching sites far from and close to the estuary,*** mature gonads of Type SF fish indicated that they may breed in areas close to the estuary,whereas the immature gonads of Type LF fish indicated that they may breed in areas far from the *** study is the first to reveal that the Changjiang River Estuary contains stocks of anadromous *** originating in different spawning sites during the same *** estuarine habitat plays a critical role in the connectivity between freshwater recruitment and

关键词： Coilia nasus otolith migration connectivity spawning site

Low-temperature plasma induced phosphate groups onto coffee residue-derived porous carbon for efficient U(Ⅵ) extraction

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第12期34卷 1-13页

作者： Zhongshan Chen xuan He Qian Li Hui yang yang liu Lining Wu Zhixin liu Baowei Hu Xiangke Wang School of Life Science Shaoxing UniversityShaoxing 312000China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206Chin

For the continuous utilization of nuclear energy and efficient control of radioactive pollution, low-cost materials with high efficient U(VI) removal are of great importance. In this study, low temperature plasma method was applied for the successful modification of Ophosphorylethanolamine(O-PEA) on the porous carbon materials. The produced materials(Cafe/O-PEA) could adsorb U(VI) efficiently with the maximum sorption capacity of 648.54mg/g at 1 hr, T=298 K, and p H=6.0, much higher than those of most carbon-based composites. U(VI) sorption was mainly controlled by strong surface complexation. From FTIR,SEM-EDS and XPS analyses, the sorption of U(VI) was related to the complexation with-NH2, phosphate and-OH groups on Cafe/O-PEA. The low temperature plasma method was an efficient, environmentally friendly and low-cost method for surface modification of materials for the effective enrichment of U(VI) from aqueous solutions.

关键词： U(Ⅵ) Coffee residue Porous carbon Low-temperature plasma modification

Heterostructured NiCr matrix composites with high strength and wear resistance

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第10期105卷 142-152页

作者： xuan Kong yang liu Minghui Chen Tao Zhang Qunchang Wang Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Self-lubricating composites are required to have excellent tribological performances and good mechanical properties when they are applied as mechanic ***,the brittle nature of most lubricants will weaken the mechanical properties of the composites where in order to get the lubricating ability proper amount of lubricants are usually incorporated,bringing challenges for them to get well-balanced mechanical and tribological *** this study,Ni Cr matrix self-lubricating composites with the addition of WS_(2)and nano-Ti were prepared via spark plasma *** hard phase of Ni_(3)Ti and the lubricant Ti S were formed via in-situ reaction at the interface,which surrounded the soft alloy matrix and developed a *** with the conventional Ni Cr-WS_(2)composite,the heterostructured composite exhibited a high yield strength of 1645 MPa,a low friction coefficient of 0.37 and a wear rate of as low as 2.25×10^(-5)mm^(3)N^(-1)m^(-1)when *** element analysis demonstrated that the heterostructure plays a key role to balance well the mechanical and tribological properties of the Ni Cr matrix composites.

关键词： Self-lubricating composites Heterostructure NiCr alloy Mechanical properties Tribology

一种缓释型ε-PL PA6复合材料的制备及其抗菌性能

在线全文

学校读者我要写书评

暂无评论

石油炼制与化工 2025年第1期56卷 40-48页

作者：王璇李伟李泽阳刘伟中石化石油化工科学研究院有限公司北京100083

以尼龙6(PA6)和聚赖氨酸(ε-PL)为原料,采用溶液共混方法制备了一系列不同ε-PL含量的ε-PL PA6复合材料,并利用扫描电镜、热重分析、差示扫描量热仪以及X射线衍射等方法对ε-PL PA6复合材料结构与性能进行了系统研究。结果表明:当ε-P... 详细信息

以尼龙6(PA6)和聚赖氨酸(ε-PL)为原料,采用溶液共混方法制备了一系列不同ε-PL含量的ε-PL PA6复合材料,并利用扫描电镜、热重分析、差示扫描量热仪以及X射线衍射等方法对ε-PL PA6复合材料结构与性能进行了系统研究。结果表明:当ε-PL质量分数为15%时,ε-PL在PA6中分散最均匀;ε-PL PA6两种材料复合对PA6晶型无影响,但其结晶温度升高、熔点降低;压片型ε-PL PA6复合材料样品中的ε-PL能够在水中持续缓慢释放,缓释过程符合Logistic模型;ε-PL质量分数为10%~20%的ε-PL PA6复合材料表现出良好的溶出抗菌性和表面抗菌性,对大肠杆菌和金黄色葡萄球菌的表面抗菌率均大于99.99%,是兼具表面抗菌和缓释抗菌功能的新型高分子复合抗菌材料。

关键词：尼龙6 聚赖氨酸缓释抗菌复合材料

Effects of process parameters on surface quality,composition segregation,microstructure and properties of QSn6.5-0.1 alloy slabs fabricated by HCCM horizontal continuous casting

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 Iron and Steel Research International 2017年第3期24卷 273-281页

作者： yang liu Xin-hua liu Hua-dong Fu Min-xuan Lou Jian-xin Xie Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China

Columnar-grained QSn6. 5-0. 1 alloy slabs with a width of 70 mm and thickness of 10 mm were fabricated by heating-cooling combined mold（ HCCM） horizontal continuous casting. The effects of process parameters on solidification microstructure,surface quality,composition segregation and mechanical properties were studied. The results showed that the slabs with good surface quality,excellent mechanical properties and no obvious segregation could be prepared at the melt casting temperature of 1 250 ℃,the heating-mold temperature of 1 150- 1 200℃,the cooling water flow rate of 600 L / h and the casting speed of 20- 80 mm / min. The slabs had the yield strength of 124- 155 MPa,the elongation rate of 46. 6%- 56. 3% and the surface roughness of 0. 22- 0. 55μm,which enabled them to be directly processed without subsequent milling surface. The ratio of Sn content in the surface to that in the core was 0. 83- 1. 10,with an average value close to 1. 0,and not obviously influenced by process parameters. When the casting speed increased from 20 to 80 mm / min,the grain size changed little if the other process parameters were the same. When the heating-mold temperature increased from 1 150 to 1 200℃,the grain size was obviously refined and became more uniform if the casting speed was the same. Within the range of the casting speed at which the columnar grain structure could be obtained,the columnar grain size was mainly influenced by the heating-mold temperature.

关键词： QSn6.5 copper alloy Heating-cooling combined mold Horizontal continuous casting Microstructure Mechanical property Composition segregation

Mixing state and evolutionary mechanism of oxalic acid homologs in Liaocheng,East China:Insights from seasonal and hourly observations

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第12期95卷 223-234页

作者： Jiangkai Ma Jingjing Meng Yanhui Wang xuan liu Xiaoting Zhang Kaiyue yang Qiang liu Zhanfang Hou School of Geography and Environment Liaocheng UniversityLiaocheng252000China Institute of Huanghe Studies Liaocheng UniversityLiaocheng252000China Shandong Provincial Liaocheng Eco-environment Monitoring Center Liaocheng252000China

Oxalic acid(C_(2))is a significant tracer of secondary organic aerosols(SOA),yet its precursors,evolutionary processes,and formation mechanisms are not fully *** knowledge gap leads to uncertainties in evaluating the climate effect and global budget of *** we compared the size distribution,mixing fraction,and evolutionary mechanism of C_(2)-containing particles between summer and *** summer,the number of C_(2) particles and their homologs decreased compared to ***,the proportion of C_(2) relative to the total number of determined particles increased,indicating that the summertime particles are more *** relative aerosol acidity(Rra)and lower in-situ pH(pHis)in summer suggest that particles are more acidic during this *** analysis and temporal variation characteristics suggest that from 9:00 to 15:00 in summer,C_(2) particles mostly originate from the photochemical decomposition of larger dicarboxylic aids,driven by O3 ***,from 16:00 to 20:00,C_(2) particles are predominantly formed through aqueous-phase oxidation,influenced by higher relative humidity(RH),aerosol liquid water content(ALWC),and ***,heavy metal particles were the predominant type of C_(2) particles,and C_(2) particles exhibited an opposite diurnal variation to Fe in summer,suggesting that the photolysis of iron oxalate complexes is an important sink of C_(2) particles during this *** winter,biomass burning(BB)particles were the most abundant,and a robust correlation between levoglucosan and C_(2) particles indicated a substantial influence of BB on C_(2) *** aqueous generation of C_(2) particles fromα-dicarbonyls driven by acidity was most effective when RH varied from 40%to 60%in the wintertime state of *** findings highlight the hourly and seasonal variations in the sources and evolutionary processes of *** variations must be considered in developing control measures and sim

关键词： Oxalic acid(C_(2))containing particles Seasonal characteristics Mixing state Formation mechanism Glyoxal and methylglyoxal