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Effects of Asymmetry of Potential on Stochastic Stokes’ Drift

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Chinese Physics Letters 2001年第4期18卷 488-490页

作者： LI Yu-xiao cao Tian-guang WU xi-Zhen ZHUO Yi-Zhong China Institute of Atomic Energy P.O.Box 275(18)Beijing 102413 Department of Physics Zhengzhou UniversityZhengzhou 450052 Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080

The directed motion of Brownian particles is generated by a travelling asymmetric *** asymptotic behaviour of probability density of the particles at long time is a solitary *** Brownian particles can do work against an external opposing force with high *** analytical expressions of the solitary wave and the efficiency of the Brownian particles are *** average velocity and the efficiency of the particles depends strongly on the travelling speed and the asymmetry of the potential.

关键词： potential. wave. Brownian

How important is carbonate dissolution in buried sandstones:evidences from petrography,porosity,experiments,and geochemical calculations

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Petroleum Science 2019年第4期16卷 729-751页

作者： guang-Hui Yuan Ying-Chang cao Jon Gluyas Yan-Zhong Wang Ke-Yu Liu Ke-Lai xi Tian Yang Jian Wang Key Laboratory of Deep Oil and Gas School of GeoscienceChina University of PetroleumQingdao 266580ShandongChina State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Department of Earth Sciences Durham UniversityDurham DH1 3LEUK

Burial dissolution of feldspar and carbonate minerals has been proposed to generate large volumes of secondary pores in subsurface reservoirs. Secondary porosity due to feldspar dissolution is ubiquitous in buried sandstones;however, extensive burial dissolution of carbonate minerals in subsurface sandstones is still debatable. In this paper, we first present four types of typical selective dissolution assemblages of feldspars and carbonate minerals developed in di erent sandstones. Under the constraints of porosity data, water–rock experiments, geochemical calculations of aggressive fluids, diagenetic mass transfer, and a review of publications on mineral dissolution in sandstone reservoirs, we argue that the hypothesis for the creation of significant volumes of secondary porosity by mesodiagenetic carbonate dissolution in subsurface sandstones is in conflict with the limited volume of aggressive fluids in rocks. In addition, no transfer mechanism supports removal of the dissolution products due to the small water volume in the subsurface reservoirs and the low mass concentration gradients in the pore water. Convincing petrographic evidence supports the view that the extensive dissolution of carbonate cements in sandstone rocks is usually associated with a high flux of deep hot fluids provided via fault systems or with meteoric freshwater during the eodiagenesis and telodiagenesis stages. The presumption of extensive mesogenetic dissolution of carbonate cements producing a significant net increase in secondary porosity should be used with careful consideration of the geological background in prediction of sandstone quality.

关键词： Mesodiagenetic Carbonate dissolution Petrography Geochemical Buried sandstones

Optical Nutation Effect in the Three-Level System Driven by a Coherent Microwave Field

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Chinese Physics Letters 1997年第8期14卷 589-592页

作者： cao Zhuo-liang GUO guang-can Department of Physics Anhui UniversityHefei 230039 Department of Physics University of Science and Technology of ChinaHefei 230026

In this paper,a coherent transient effect-optical nutation in Bloch form is studied semiclassically in the three-level atomic system driven by a coherent microwave *** amplitude of the optical nutation signal field is *** is found that the signal field,related to the microwave,is the overlap of two slow oscillations instead of one.

关键词： field. microwave coherent

Interference Phase of Mass Neutrino in Schwarzschild de Sitter Field

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Chinese Physics Letters 2011年第2期28卷 247-249页

作者： cao guang-Tao WANG Yong-Jiu Institute of Physics Hunan Normal UniversityChangsha 410081

We calculate the interference phase of the mass neutrinos in high energy limit propagating in radial and nonradial directions along the geodesic by solving Hamilton-Jacobi equation,and discuss the contributions of cos... 详细信息

关键词： Sitter radial momentum

Intensified Impact of Northern Tropical Atlantic SST on Tropical Cyclogenesis Frequency over the Western North Pacific after the Late 1980s

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Advances in Atmospheric Sciences 2016年第8期33卷 919-930页

作者： xi cao Shangfeng CHEN guanghua CHEN Renguang WU Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences

Previous studies suggest that spring SST anomalies over the northern tropical Atlantic（NTA） affect the tropical cyclone（TC） activity over the western North Pacific（WNP） in the following summer and fall. The present study reveals that the connection between spring NTA SST and following summer–fall WNP TC genesis frequency is not stationary. The influence of spring NTA SST on following summer–fall WNP TC genesis frequency is weak and insignificant before, but strong and significant after, the late 1980 s. Before the late 1980 s, the NTA SST anomaly-induced SST anomalies in the tropical central Pacific are weak, and the response of atmospheric circulation over the WNP is not strong. As a result, the connection between spring NTA SST and following summer–fall WNP TC genesis frequency is insignificant in the former period. In contrast,after the late 1980 s, NTA SST anomalies induce pronounced tropical central Pacific SST anomalies through an Atlantic–Pacific teleconnection. Tropical central Pacific SST anomalies further induce favorable conditions for WNP TC genesis,including vertical motion, mid-level relative humidity, and vertical zonal wind shear. Hence, the connection between NTA SST and WNP TC genesis frequency is significant in the recent period. Further analysis shows that the interdecadal change in the connection between spring NTA SST and following summer–fall WNP TC genesis frequency may be related to the climatological SST change over the NTA region.

关键词： northern tropical Atlantic SST tropical cyclone western North Pacific

Effect of Mg addition on TiN inclusions in GCr15 bearing steel

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Journal of Iron and Steel Research International 2022年第6期29卷 925-938页

作者： Lei cao Guo-cheng Wang Yuan-you xiao Rong-guang Yang School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Key Laboratory of Metallurgy Engineering Liaoning Province University of Science and Technology LiaoningAnshan 114051LiaoningChina Steel Rolling Department Shougang Jingtang United Iron and Steel Co.Ltd.Tangshan 063200HebeiChina

Compared with the original GCr15 bearing steel,TiN inclusions are greatly reduced by the effect of Mg addition,and many different types of non-metallic Mg-containing inclusions were observed in Mg-treated GCr15 bearing steel which includes MgO,MgS·MnS,MgO–MgS·MnS,MgAl_(2)O_(4)–MgS·MnS,MgO–TiN,MgS·MnS–TiN,and MgO–MgS·MnS–*** inclusion size distribution based on automatic inclusion analysis software shows that the number of inclusion with the size ranging from 1 to 3μm increases obviously because a large amount of MgO,MgS·MnS,TiN inclusions containing Mg with smaller sizes are massively *** situ observation on the experimental steel by high-temperature confocal laser scanning microscopy confirms that MgO can provide nucleation sites for *** addition,the MgS·MnS and MgO–MgS·MnS inclusions can also provide positions for the nucleation of *** calculations indicate that after Mg addition to liquid steel,a large number of fine MgO inclusions are generated in the liquid steel because of the strong reactivity of Mg and *** the same time,MgS precedes TiN precipitates in the solid–liquid two-phase region;thus,MgO and MgS·MnS can provide sites for TiN *** last,two possible formation pathways for the above various TiN inclusions containing Mg are discussed.

关键词： Mg treatment GCr15 bearing steel TiN inclusion Size distribution In situ observation

Optimization of Air Route Network Nodes to Avoid ″Three Areas″ Based on An Adaptive Ant Colony Algorithm

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第4期33卷 469-478页

作者： Wang Shijin Li Qingyun cao xi Li Haiyun College of Civil Aviation Nanjing University of Aeronautics and Astronautics

Air route network(ARN)planning is an efficient way to alleviate civil aviation flight delays caused by increasing development and pressure for safe ***,the ARN shortest path was taken as the objective function,and an air route network node(ARNN)optimization model was developed to circumvent the restrictions imposed by″three areas″,also known as prohibited areas,restricted areas,and dangerous areas(PRDs),by creating agrid *** finally the objective function was solved by means of an adaptive ant colony algorithm(AACA).The A593,A470,B221,and G204 air routes in the busy ZSHA flight information region,where the airspace includes areas with different levels of PRDs,were taken as an *** on current flight patterns,a layout optimization of the ARNN was computed using this model and algorithm and successfully avoided *** optimized result reduced the total length of routes by 2.14% and the total cost by 9.875%.

关键词： air route network planning three area avoidance optimization of air route network node adaptive ant colony algorithm grid environment

MALDI ToF Investigation of the Reaction of Soy Protein Isolate with Glutaraldehyde for Wood Adhesives

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Journal of Renewable Materials 2023年第3期11卷 1439-1450页

作者： Qianyu Zhang Antonio Pizzi Hong Lei Xuedong xi Ming cao Long cao Yunnan key Laboratory of Wood Adhesives and Glue Products College of Material Science and EngineeringSouthwest Forestry UniversityKunming650224China International Joint Research Center for Biomass Materials Southwest Forestry UniversityKunming650224China Universitéde Lorraine LERMAB-ENSTIB 27 rue Philippe SeguinEpinal88000France

Soy protein adhesives are currently a hot research topic in the wood panels industry for the abundant raw material reserves,reasonable price and outstanding environmental *** their poor water resistance,low bonding strength and intolerance to mold are major drawbacks,so that proper modification before use is *** is one of the more apt cross-linking agents for soybean protein adhesives,which can effectively improve the bonding strength and water resistance of the ***,glutaraldehyde is also an efficient and broad-spectrum fungicide that can significantly improve the anti-fungal properties of a soy protein *** the work presented here,matrix assisted laser desorption ionization(MALDI-ToF)mass spectrometry and Fourier transform infrared spectroscopy techniques were used to analyze the reaction mechanism of glutaraldehyde cross-linking soybean *** results confirmed the reaction of the aldehyde group with amino groups of the side chains and the amide groups of the peptide linkages constituting the skeletal chain of the *** laboratory plywood and particleboard bonded with glutaraldehyde-soy bean protein adhesives were prepared to determine the adhesive bonding properties,the dry strength,24 h cold water soaking wet strength and 3 h hot water(63°C)wet strength of plywood were 2.03,1.13 and 0.75 MPa,respectively,which satisfied the requirements of industrial production.

关键词： Bio-based adhesives soy bean protein MALDI-ToF particleboard plywood

Autophagic cell death induced by reactive oxygen species is involved in hyperthermic sensitization to ionizing radiation in human hepatocellular carcinoma cells

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World Journal of Gastroenterology 2017年第30期23卷 5530-5537页

作者： guang-Jin Yuan Jun-Jian Deng De-Dong cao Lei Shi xin Chen Jin-Ju Lei xi-Ming Xu Department of Oncology Nationality Hospital of Qianjiang Cancer Center Renmin Hospital of Wuhan University

AIM To investigate whether autophagic cell death is involved in hyperthermic sensitization to ionizing radiation in human hepatocellular carcinoma cells, and to explore the underlying *** Human hepatocellular carcinoma cells were treated with hyperthermia and ionizing radiation. MTT and clonogenic assays were performed to determine cell survival. Cell autophagy was detected using acridine orange staining and flow cytometric analysis, and the expression of autophagy-associated proteins, LC3 and p62, was determined by Western blot analysis. Intracellular reactive oxygen species(ROS) were quantified using the fluorescent probe *** Treatment with hyperthermia and ionizing radiation significantly decreased cell viability and surviving fraction as compared with hyperthermia or ionizing radiation alone. Cell autophagy was significantly increased after ionizing radiation combined with hyperthermia treatment, as evidenced by increased formation of acidic vesicular organelles, increased expression of LC3 II and decreased expression of p62. Intracellular ROS were also increased after combined treatment with hyperthermia and ionizing radiation. Pretreatment with N-acetylcysteine, an ROS scavenger, markedly inhibited the cytotoxicity and cell autophagy induced by hyperthermia and ionizing *** Autophagic cell death is involved in hyperthermic sensitization of cancer cells to ionizing radiation, and its induction may be due to the increased intracellular ROS.

关键词： Autophagic cell death Hyperthermia Ionizing radiation Hepatocellular carcinoma Reactive oxygen species