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Soil Taxonomy and Distribution Characteristics of the Permafrost Region in the Qinghai-Tibet Plateau, China

Journal of Mountain Science 2015年第6期12卷 1448-1459页

作者： fang hong-bing ZHAO Lin WU Xiao-dong ZHAO Yu-guo ZHAO Yong-hua HU Guo-jie Cryosphere Research Station on the Qinghai-Tibetan Plateau State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences School of Environmental and Municipal Engineering Lanzhou Jiaotong University State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences

Understanding the soil taxonomy and distribution characteristics of the permafrost region in the Qinghai-Tibet Plateau(QTP) is very important. On the basis of extensive field surveys and experimental analysis, this study carries out soil taxonomic classification of the permafrost region in the QTP. According to Chinese Soil Taxonomy, the soil of the permafrost region in the QTP can be divided into 6 Orders(Histosols, Aridosols, Gleyosols, Isohumosols, Cambosols, Primosols), 11 Suborders, 19 Groups and 24 Subgroups. Cambosols are the dominant soil type in the permafrost region, followed by Aridosols. From the east to the west of the permafrost region in the QTP, the soil type gradually changes from Cambosols to Aridosols, showing a meridional zonality. The eastern region is dominated by Cambosols, with no obvious latitudinal zonality. From the south to the northwest of the western region, the dominance of Aridosols and Cambosols gradually transited to Aridosols, presenting a latitudinal zonality. The soil in the western region shows a poor vertical zonality, while the distribution of suborders of Cambosols in the eastern region shows a more obvious vertical zonality. The result indicates that precipitation and vegetation are the main factors that influence the zonal distribution of soil. The permafrost in the east has some effect on the vertical soil zonality, but the effect is weakened in the west.

关键词： Qinghai-Tibet Plateau Permafrost region Soil taxonomy Soil distribution

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Effects of WC-Co reinforced Ni-based alloy by laser melting deposition: Wear resistance and corrosion resistance

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Chinese Physics B 2021年第1期30卷 449-457页

作者： Zhao-Zhen Huang Zhi-Chen Zhang Fan-Liang Tantai hong-fang Tian Zhen-Jie Gu Tao Xi Zhu Qian Yan fang School of Mechanical Engineering Tiangong UniversityTianjin 300387China Shandong Energy Heavy Equipment Group Dazu Remanufacturing Co. LtdXintai 271219China Laser Technology Institute Tiangong UniversityTianjin 300387China Tianjin Zhujin Technology Development Co. LtdTianjin 300230China

WC-Co reinforced C276 alloy composite coatings are fabricated on Q235 steel by laser melting *** microstructure,hardness,wear performance,and electrochemical corrosion behavior of composite coating are *** results show that WC-Co particles are mostly uniformly distributed in the coating and provide favorable conditions for heterogeneous *** microstructure of C276/WC-Co composite coatings is composed of γ-Ni solid solution dendrites and MoNi solid solution *** WC-Co particles can effectively improve the hardness and wear resistance of C276 *** average hardness of the composite coating containing 10-wt% WC-Co(447 HV_(0.2)) are 1.26 times higher than that of the C276 alloy(356 HV_(0.2)).The wear rate of composite coating containing 10-wt% WC-Co(6.95 ×10^(-3) mg/m) is just 3.5% of that of C276 coating(196.23 × 10^(-3) mg/m).However,comparing with Hastelloy C276,the corrosion resistance of C276/WC-Co composite coating decreases.

关键词： WC-Co wear resistance corrosion resistance laser melting deposition

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Prospective, randomized comparison of two supplemental oxygen methods during gastro-scopy with propofol mono-sedation in obese patients

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World Journal of Clinical Cases 2021年第20期9卷 5479-5489页

作者： Liu-Jia-Zi Shao fang-Xiao hong Fu-Kun Liu Lei Wan Fu-Shan Xue Department of Anesthesiology Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China

BACKGROUND Hypoxemia is a common complication in obese patients during gastroscopy with *** Wei nasal jet tube(WNJT)is a new special nasopharyngeal airway with the ability to provide supraglottic jet ventilation and oxygen insufflation via its built-in wall *** aim of this study was to compare the efficacy and safety of the WNJT vs a nasal cannula for supplemental oxygen during gastroscopy with propofol mono-sedation in obese *** To compare the efficacy and safety of the WNJT vs a nasal cannula for supplemental oxygen during gastroscopy with propofol mono-sedation in obese *** A total of 103 obese patients with a body mass index of 30 kg/m2 or more undergoing elective gastroscopy under propofol mono-sedation were randomly assigned to receive supplemental oxygen at 5 L/min through either a WNJT(WNJT group,n=51)or a nasal cannula(nasal cannula group,n=52).The lowest pulse oxygen saturation(SpO2)and mild and severe hypoxemia during gastroscopy were *** primary outcome was the incidence of *** The lowest SpO2 during gastroscopy with propofol mono-sedation was significantly increased in the WNJT group compared with the nasal cannula *** incidence of mild hypoxemia and total incidence of hypoxemia were significantly lower in the WNJT group than in the nasal cannula *** than a higher incidence of epistaxis in the WNJT group,the occurrence of adverse events was similar between the *** neither device demonstrated a statistically significant difference in satisfaction among patients,the WNJT did result in improved satisfaction among anesthetists and *** During gastroscopy with propofol mono-sedation in obese patients,the WNJT,when compared with a nasal cannula for supplemental oxygen,can significantly reduce the occurrence of hypoxemia and improve both arterial oxygenation and satisfaction among anesthetists and *** use of the WNJT may,however,lead to epistaxis

关键词： Supplemental oxygen Gastroscopy Sedation Obese patients

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Preconditioning and postconditioning reduce hepatic ischemia-reperfusion injury in rats

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Hepatobiliary & Pancreatic Diseases International 2009年第6期8卷 586-590页

作者： Zhang, Wan-Xing Yin, Wen Zhang, Lei Wang, Lan-Hui Bao, Lei Tuo, hong-fang Zhou, Li-fang Wang, Chun-Cheng Hebei Prov Gen Hosp Dept Hepatobiliary Surg Shijiazhuang 050051 Peoples R China Hebei Prov Gen Hosp Dept Pharm Shijiazhuang 050051 Peoples R China

BACKGROUND: Ischemia-reperfusion injury occurs when ischemic tissues or organs suffer from further functional and structural damage when their blood supply recovers. This study aimed to contrast the protective effects of ischemic preconditioning and ischemic postconditioning in hepatic ischemia-reperfusion injury in rats. METHODS: Thirty-two healthy male Wistar rats were randomly divided into four groups: sham-operated (SO), ischemia-reperfusion (IR), ischemic preconditioning (I-pre), and ischemic postconditioning (I-post). Blood samples and hepatic tissue were taken from all groups after the experiments. RESULTS: There were significant differences between the IR, I-pre and I-post groups in alanine aminotransferase and aspartate aminotransferase levels, NF-kappa B p65 expression, apoptosis index and superoxide dismutase activity in hepatic tissue. There were no significant differences between the I-pre and I-post groups. CONCLUSIONS: Ischemic postconditioning and ischemic preconditioning reduce hepatic ischemia-reperfusion injury, but in clinical practice the former is a more appropriate choice.

关键词： liver ischemia-reperfusion injury ischemic postconditioning ischemic preconditioning NF-kappa B

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Dramatic Impact of Auxiliary Ligands on the Dynamic Magnetic Relaxation in Tetranuclear Dy^(III)_(2)Zn^(II)_(2) Single Molecule Magnets

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Chinese Journal of Chemistry 2022年第20期40卷 2415-2420页

作者： Gao-Peng Li hong-fang Xie Shi-Rui Yang Yun-Long Fu Yi-Quan Zhang Yao-Yu Wang Key Laboratory of Magnetic Molecules&Magnetic Information Materials of the Ministry of Education School of Chemistry&Material ScienceShanxi Normal UniversityTaiyuanShanxi030031 China Weinan Bureau of Natural Resources and Planning WeinanShaanxi714000 China Jiangsu Key Laboratory for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjingJiangsu210023 China Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Shaanxi Key Laboratory of Physico-Inorganic ChemistryCollege of Chemistry and Materials ScienceNorthwest UniversityXi'anShaanxi710127 China

Better understanding the determining factors of dynamic magnetic relaxation in polynuclear lanthanide based single-molecule magnets(SMMs)remains a challenge due to the complexity of such architectures involving interactions between the magnetic *** address this issue,two structurally related heterometal Dy^(III)_(2)Zn^(II)_(2) SMMs,[Zn_(2)Dy_(2)(L)_(4)(Ac)_(2)(DMF)(CH_(3)OH)]·CH_(3)OH·2H_(2)O(1)and[Zn_(2)Dy_(2)(L)_(4)(Ac)_(2)(DMF)_(2)]·4CH_(3)CN(2)(H_(2)L=(E)-2-((2-hydroxy-3-methoxybenzylidene)amino)-4-methyphenol,DMF=N,N-dimethylformamide),are introduced and *** modifying the auxiliary ligands on one Dy^(III) site while retaining that on the other Dy^(III),the intramolecular magnetic interactions and relaxation dynamics in these two heterometallic-Dy^(III)_(2)Zn^(II)_(2) SMMs can be tuned,demonstrating a dramatic change in the magnet relaxation behavior with energy barrier changing from a negligible value for 1 to 305 K for *** initio calculations reveal that changing the coordination geometries on the Dy^(III) sites can significantly affect the magnetic interactions as well as single-ion anisotropy.

关键词： Single-molecule magnets Dynamic magnetic relaxation Dysprosium Auxiliary ligands Ab initio calculations

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Chiral multiple-resonance thermally activated delayed fluorescence materials based on chiral spiro-axis skeleton for efficient circularly polarized electroluminescence

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Science China Chemistry 2024年第7期67卷 2257-2264页

作者： Shi-Quan Song Xiao Han Zhong-Zhong Huo Ching-Fai Yip Xian-fang hong Meng-Ning Ding You-Xuan Zheng State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Chiral luminescence materials have potential applications in the field of three-dimensional displays due to their circularly polarized luminescence(CPL)***,the further development of circularly polarized organic light-emitting diodes(CP-OLEDs)needs to meet the requirements of high efficiency,high color purity,low cost,and high dissymmetry factor(gPLor gEL),chiral multiple resonance thermally activated delayed fluorescence(MR-TADF)materials are considered as candidates in these ***,based on a pair of chiral spirofluorene precursors,two pairs of high-performance chiral MR-TADF emitters((R/S)-p-Spiro-DtBuCzB and(R/S)-m-Spiro-DtBuCzB)are developed,which exhibit strong emissions peaking at 491 and 502 nm in toluene with full-width at half-maximum values of 25 and 33 nm,*** addition,small singlet–triplet energy gaps of 0.15 and 0.10 eV with high absolute photoluminescence efficiencies of 95.0%and 96.7%are observed for p-Spiro-DtBuCzB and m-Spiro-DtBuCzB molecules,*** based on p-Spiro-DtBuCzB and m-Spiro-DtBuCzB display high maximum external quantum efficiencies of 29.6%and 33.8%,*** importantly,CP-OLEDs present symmetric circularly polarized electroluminescence spectra with|gEL|factors of 3.36×10^(-4)and 7.66×10^(-4)for devices based on(R/S)-p-Spiro-DtBuCzB and(R/S)-m-Spiro-DtBuCzB enantiomers,respectively.

关键词： chiral spiro-axis skeleton-based material multiple resonance thermally activated delayed fluorescence circularly polarized electroluminescence dissymmetry factor external quantum efficiency

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Optically Detected Magnetic Resonance of Diamond Nitrogen-Vacancy Centers under Megabar Pressures

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Chinese Physics Letters 2022年第11期39卷 63-67页

作者： Jian-hong Dai Yan-Xing Shang Yong-hong Yu Yue Xu Hui Yu fang hong Xiao-Hui Yu Xin-Yu Pan Gang-Qin Liu Beijing National Research Center for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center of Excellence in Topological Quantum Computation Beijing 100190China

Megabar pressures are of crucial importance for cutting-edge studies of condensed matter physics and *** the development of diamond anvil cell(DAC),laboratory studies of high pressure have entered the megabar era for ***,it is still challenging to implement in situ magnetic sensing under ultrahigh *** this work,we demonstrate optically detected magnetic resonance and coherent quantum control of diamond nitrogen-vacancy(NV)center,a promising quantum sensor inside the DAC,up to 1.4 *** pressure dependence of optical and spin properties of NV centers in diamond are quantified,and the evolution of an external magnetic field has been successfully tracked at about 80 *** results shed new light on our understanding of diamond NV centers and pave the way for quantum sensing under extreme conditions.

关键词： quantum centers extreme

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Ultrathin SrTiO_(3)-based oxide memristor with both drift and diffusive dynamics as versatile synaptic emulators for neuromorphic computing

Materials Futures

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Materials Futures 2023年第3期2卷 156-163页

作者： fang Nie Jie Wang hong fang Shuanger Ma Feiyang Wu Wenbo Zhao Shizhan Wei Yuling Wang Le Zhao Shishen Yan Chen Ge Limei Zheng School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100People’s Republic of China School of Information and Automation Engineering Qilu University of Technology(Shandong Academy of Science)Jinan 250353People’s Republic of China Functional Materials and Acousto-Optic Instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080People’s Republic of China Spintronics Institute School of Physics and TechnologyUniversity of JinanJinan 250022People’s Republic of China Heilongjiang Provincial Key Laboratory of Oilfield Applied Chemistry and Technology School of Mechatronic EngineeringDaqing Normal UniversityDaqing 163712People’s Republic of China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190People’s Republic of China

Artificial synapses are electronic devices that simulate important functions of biological synapses,and therefore are the basic components of artificial neural morphological networks for brain-like *** of the most important objectives for developing artificial synapses is to simulate the characteristics of biological synapses as much as possible,especially their self-adaptive ability to external ***,we have successfully developed an artificial synapse with multiple synaptic functions and highly adaptive characteristics based on a simple SrTiO_(3)/Nb:SrTiO_(3)heterojunction type *** functions of synaptic learning,such as short-term/long-term plasticity(STP/LTP),transition from STP to LTP,learning–forgetting–relearning behaviors,associative learning and dynamic filtering,are all bio-realistically implemented in a single *** remarkable synaptic performance is attributed to the fascinating inherent dynamics of oxygen vacancy drift and diffusion,which give rise to the coexistence of volatile-and nonvolatile-type resistive *** work reports a multi-functional synaptic emulator with advanced computing capability based on a simple heterostructure,showing great application potential for a compact and low-power neuromorphic computing system.

关键词： memristor artificial synapse synaptic plasticity associative learning learning-experience

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The Steric Effect of trans-(1S,2S)-1-Substituted-2-(N,N-dialkyl-amino)-1-indanol Derivatives as Chiral Ligands in the Catalytic Enantioselective Addition of Diethylzinc to Aldehydes

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Chinese Chemical Letters 2002年第11期13卷 1029-1032页

作者： Qian Yong XU hong fang YANG Xin Fu PAN Guang Ming ZHU Northwest Institute of Nuclear Technology P.O.Box 69Xi'an 710024 Department of Chemistry National Laboratory of Applied Organic ChemistryLanzhou UniversityLanzhou 730000 Department of Chemical Engineering Northwestern Polytechnic UniversityXi'an 710062

Optically active trans-(1S,2S)-1-substituted-2-(N,N-dialkylamino)-1-indanol derivatives have been prepared and used in the asymmetric addition of diethylzinc to aldehydes to give sec-alcohol in good yield with up to 9... 详细信息

关键词： Diethylzinc enantioselective alkylation indanol derivative.

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New Duplex Microstructure of Grain Boundary Allotriomorphic Ferrite/Granular Bainite

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Journal of Iron and Steel Research International 2002年第2期9卷 33-38页

作者： XU Ping-guang fang hong-sheng BAI Bing-zhe WANG Zhen-jia YANG Zhi-gang HUANG Jin-feng Tsinghua University Central Iron&Steel Research Institute

This was a feasibility study for a modified 304 steel resistant to stress corrosion cracking (SCC) in aqueous environment containing chloride. SCC tests were conducted potentiostaticaly with spot welded specimens, which had both crevice and residual stress, mainly in 3 % NaCl solution at various temperatures to determine the critical temperature for SCC at and below which the steel would not suffer from SCC. The effects of individual alloying element of silicon, manganese and copper on SCC of 18Cr 14Ni steels which phosphor content is 0.002 % and molybdenum content is 0.01 % were examined. Addition of 1 or 2 % of copper has beneficial effect on resistance to SCC, while increasing silicon or manganese content has no significant effect. Critical temperature of the steel with 0.002 % of phosphor and 2 % of copper is 150 ℃, which is markedly higher than 50 ℃ of 304L steel. However, the beneficial effect of copper is reduced with increasing phosphor content. From practical viewpoint, the modified steel with good SCC resistance should have 0.01 %-0.015 % of phosphor and 0.3 % or more of molybdenum, because it is very difficult to reduce phosphor content below 0 008 % industrially and such molybdenum content is inevitably introduced through cost saving melting process using return steel. Aluminium is to be added as another alloying element and 3 % of aluminium combined with 2 % of copper has been found to negate the deleterious effects of increased phosphor and molybdenum content. As a candidate steel at this stage, 14Cr 16Ni 0.013P 2Cu 1Al (0.3 1)Mo steel has critical temperature of 110 ℃.

关键词： austenitic stainless steel NaCl solution stress corrosion cracking

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