检索结果-南通市图书馆

Surface Carbon Chemical States of Ion Implanted AISI 440C Martensitic Stainless Steel

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 Iron and Steel Research International 2015年第6期22卷 513-518页

作者： jie jin Feng-bin LIU Yun-bo CHEN Ke-wei GAO School of Materials Science and Engineering University of Science and Technology Beijing China Academy of Machinery Science and Technology College of Mechanical and Electric Engineering North China University of Technology

Carbon atoms segregate in the surface region for polished AISI 440C stainless steel After ion implanta tion, the surface carbon atoms exist in different forms. To elucidate their existence, surface structures and carbon chemical states o[ unimplanted, N~ implanted, Ti＋ implanted and N＋/Ti＋ co-implanted samples were analyzed by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and X-ray photoelectron spectroscopy （XPS）. The results indicated that various phases form in the surface or subsurface region after ion implantation, while the surface topography of the samples remains intact. For polished unimplanted sample, besides some Fe3 C phase and C- C phase, Cr, Cs phase dominates its surface region. Little change of carbon chemical states occurs after N＋ ion im- plantation. For Ti＋ implanted sample, besides some metal oxycarbide phases, most carbon amorphous phases form in surface region. Concerning N＋/Ti＋ co-implantation, CrrCs compound as well as Fe^C phase dominates the sur face region while no C-C phase is found. In addition, compared with single ion implantation, N＋/Ti＋ co-implanta tion would increase the ion implantation depth significantly. The formed phases of the carbon atoms play an impor- tant role in affecting the surface properties of AISI 440C stainless steel.

关键词： AISI 440C steel carbon segregation ion implantation chemical state phase

Formation of Na_(1+x)V_3O_8 Nanoribbon Thin Film from V_2O_5 Xerogel on Sodium Silicate Glass Substrate

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第4期23卷 381-383页

作者： GUO Yi XU jin-jie LI Jun YANG Wen-sheng College of Chemistry Jilin University Changchun 130012 P. R. China

Na1＋xV3O8 nanoribbon thin film was successfully fabricated by annealing the V2O5 xerogel film on sodium sili-cate glass substrate at 450℃. It has been identified that the amount of sodium ions diffused into the V2O5 xerogel film increases with the high temperature of annealing treatment. The sodium glass substrate serves as a limited sodium source to induce the transformation from V2O5 to Na1＋xV3O8.

关键词： Vanadium pentoxide Sodium silicate glass Nanoribbon Cathode materials

Inducing the SnO2-based electron transport layer into NiFe LDH/NF as efficient catalyst for OER and methanol oxidation reaction

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29期124卷 102-108页

作者： Changwu Wan jie jin Xinyu Wei Shizhuo Chen Yi Zhang Tenglong Zhu Hongxia Qu School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China

In an electrocatalyst with a heterointerface structure,the different interfaces can efficiently adjust the catalyst’s conductivity and electron arrangement,thereby enhancing the activity of the *** and smaller Ni Fe LDH was successfully constructed on the surface of SnOnanosheet supported NF by layer by layer assembly,and exhibits lower overpotential of 234 mV at a current density of 10 m A cm,which only increases by 6.4%even at a high current density of 100 mA *** excellent OER activity of catalyst is attributed to the contribution of the semiconductor SnOelectron transport *** experiments and characterization,3d structure SnOnanosheets control the growth of ultra-thin nickel-iron,the hierarchical interface between SnOand Ni Fe LDH can change the electron arrangement around the iron and nickel active centers at the interface,resulting the valence states of iron slightly increased and Nicontent *** result will promote the oxidation of ***,the SnOsemiconductor as electron transport layer is conducive to trapping electrons generated in oxidation reaction,promoting electrons transferring from the Ni Fe LDH active center to the Ni substrate more quickly,and enhance the activity of Ni Fe *** also shows excellent activity in an electrolyte solution containing 0.5 M methanol and 1 M KOH,and only 1.396 V(***)is required to drive a current density of 10 mA cm.

关键词： SnO2 nanosheet Electron transport layer Heterointerface structure Water oxidation Methanol oxidation Ultrathin NiFe LDH

Flame Structure of Methane and Kerosene Combustion with a Compact Concave Flame-Holder using the LES-pdf Method

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第1期33卷 222-234页

作者： WANG Fang WANG Yunfan WEI Guanyi LIU Denghuan jin jie JONES P.William School of Energy and Power Engineering Beihang UniversityBeijingBeijing 100191China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

Compact flame-holders for afterburners are an increasing requirement for modern aero ***,flame-holder design is non-trivial since high inlet temperatures,velocities,and elaborate structures induce complex turbulence,combustion,and spray coupling in modern *** this work,the LES-pdf and stochastic fields-Lagrangian particle spray methods are used to investigate methane and aviation kerosene combustion structures formed by new-type concave *** flow pattern,combustion mode,and flame structure of gaseous and liquid fuel around a concave flame-holder are analyzed,discussed,and compared with experimental *** reveal that the flame stability of a concave flame-holder is better than that of the non-concave ***,when using liquid fuel,the concave flame-holder forms a stable and compact *** results suggest concave flame-holders are a promising design for compact afterburners.

关键词： concave structure flame-holder LES-pdf spray combustion flame structure AECSC

Effect of nitrile butadiene rubber hardness on the sealing characteristics of hydraulic O-ring rod seals

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第1期25卷 63-78页

作者： Xiaoxuan LI Bingqing WANG Xudong PENG Yuntang LI Xiaolu LI Yuan CHEN jie jin College of Quality and Safety Engineering China Jiliang UniversityHangzhou310018China College of Mechanical and Electrical Engineering China Jiliang UniversityHangzhou310018China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou310023China

The nitrile butadiene rubber(NBR)hardness effect on the sealing characteristics of hydraulic O-ring rod seals is analyzed based on a mixed lubrication elastohydrodynamic *** studies are conducted to reveal the mechanism of the influence of rubber hardness on the static and dynamic behavior of *** optimized selections of rubber hardness are then investigated under different *** show that the low hardness seal is prone to stress concentration due to the extrusion effect under high pressure conditions;it is also more prone to leaking.A high hardness seal can better prevent leakage by reducing film thickness but it will cause large frictional power loss and increase the probability of wear *** choice of low hardness is recommended to reduce friction with the premise that leakage requirements are met.

关键词： Nitrile butadiene rubber(NBR)hardness Sealing characteristics Optimized selection O-ring seal

Taiji-TianQin-LISA network:Precisely measuring the Hubble constant using both bright and dark sirens

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

Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 59-77页

作者： Shang-jie jin Ye-Zhu Zhang Ji-Yu Song jing-Fei Zhang Xin Zhang Key Laboratory of Cosmology and Astrophysics(Liaoning)&College of Sciences Northeastern UniversityShenyang 110819China Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education) Northeastern UniversityShenyang 110819China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern UniversityShenyang 110819China

In the coming decades,the space-based gravitational-wave(GW)detectors such as Taiji,TianQin,and LISA are expected to form a network capable of detecting millihertz GWs emitted by the mergers of massive black hole binaries(MBHBs).In this work,we investigate the potential of GW standard sirens from the Taiji-TianQin-LISA network in constraining cosmological *** the optimistic scenario in which electromagnetic(EM)counterparts can be detected,we predict the number of detectable bright sirens based on three different MBHB population models,i.e.,popⅢ,Q3d,and *** results show that the TaijiTianQin-LISA network alone could achieve a constraint precision of 0.9%for the Hubble constant,meeting the standard of precision ***,the Taiji-TianQin-LISA network could effectively break the cosmological parameter degeneracies generated by the CMB data,particularly in the dynamical dark energy *** combined with the CMB data,the joint CMB+Taiji-TianQin-LISA data offerσ(w)=0.036 in the wCDM model,which is close to the latest constraint result obtained from the CMB+SN *** also consider a conservative scenario in which EM counterparts are not *** to the precise sky localizations of MBHBs by the Taiji-TianQin-LISA network,the constraint precision of the Hubble constant is expected to reach 1.2%.In conclusion,the GW standard sirens from the Taiji-TianQin-LISA network will play a critical role in helping solve the Hubble tension and shedding light on the nature of dark energy.

关键词： space-based gravitational wave detection standard sirens the Taiji-TianQin-LISA network the Hubble constant dark energy

GC-MS Analysis of Amino Acids in Extract of Cornus Caprae Hircus

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第6期25卷 812-816页

作者： XU jin-zhong SHEN jie CHENG Yi-yu QU Hai-bin Department of Chinese Medicine Science and Engineering College of Pharmaceutical Sciences Zhejiang University Hangzhou 310058 P. R. China

Amino acids are an important type of bioactive components in Chinese traditional medicines, especially animal drugs. However, few modern analytical methods targeted at amino acids have been developed for the quality control of animal drugs. A gas chromatography-mass spectrometric method was built for the quantification analysis of amino acids in the extracts of Comus Caprae Hircus which has been widely used in Chinese medicine compound prescriptions. The full method validation, including the linearity, limit of detection and quantification, repeatability, precision, stability, and recovery test, was examined. The results indicate that the developed method is suitable for the quantification of amino acids in the extracts of Comus Caprae Hircus. The developed method was applied to the quantification analysis of twelve amino acids in different batches of extracts of Comus Caprae Hircus.

关键词： Comus Caprae Hircus Amino acid Gas chromatography-mass spectrometry Quantification

The setereoselective preparation ofβ-keto esters using baker's yeast in the presence of rice wine koji

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第3期19卷 311-313页

作者： jin Cui Ming jie Zhang Xiang Qian Wang Nai jing Cui School of Science Tianjin University Ttanjin 300072 China

By the addition of rice wine koji, enhancement of the reactivity was observed for the baker＇s yeast reduction of β-keto esters into （S）-β-hydroxy esters with high enantiomeric purity （73-98%）.

关键词： Baker's yeast Biocatalyst Rice wine koji β-Keto esters

Vitis amuerensis CBF3 Gene Isolation,Sequence Analysis and Expression

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第8期9卷 1127-1132页

作者： WANG Zhan-bin FENG Lian-rong WANG jin-jie WANG Zhi-ying Northeast Forestry University/Key Labotatory of Forest Tree Genetic Improvement and Biotechnology Ministry of Agricuture Harbin 150040 P.R.China Institute of Poplar of Liaoning Province Gaizhou 115200 P.R. China

The full length cDNA sequence of CBF3 （CRT/DRE-binding factor） was cloned from Vitis amurensis by reverse transcription polymerase chain reaction （RT-PCR） using the primers designed based on CBF genes available in GenBank. Sequence analysis showed that the gene had 854 bp long and its coding sequence contained 720 bp, encoding a protein with 239 amino acids and an AP2 structural domain. The molecular mass of CBF3 was predicted to be 25.9 kDa and its theoretical isoelectric point was 7.02 and aliphatic index was 59.29. The average hydropathicity of the protein was -0.551. The tertiary structures of CBF3 were also analyzed. The prokaryotic expression vector pGEX-4T-CBF3 containing CBF3 gene was constructed and CBF3 fusion protein （52 kDa） was produced in Escherichia coli after induction with 1 mmol L-1 IPTG. Further studies are needed to evaluate its potential application for improving plant resistance to cold and other stress condition such as drought and salinity.

关键词： Vitis amurensis CBF gene cloning sequence analysis expression in prokaryote