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Nonlinear simultaneous inversion of pore structure and physical parameters based on elastic impedance

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Science China Earth Sciences 2021年第6期64卷 977-991页

作者： Hongbing LI Jiajia ZHANG Haojie PAN Qiang GAO Research Institute of Petroleum Exploration and Development PetroChina Company LimitedBeijing100083China School of Geosciences China University of Petroleum(East China)Qingdao266580China College of Geophysics and Petroleum Resources Yangtze UniversityWuhan430100China

Carbonate reservoirs have complex pore structures,which not only significantly affect the elastic properties and seismic responses of the reservoirs but also affect the accuracy of the prediction of the physical *** existing rockphysics inversion methods are mainly designed for clastic rocks,and the inversion objects are generally porosity and water *** data used are primarily based on the elastic parameters,and the inversion methods are mainly linear *** date,there has been a lack of a simultaneous pore structure and physical parameter inversion method for carbonate *** solve these problems,a new Bayesian nonlinear simultaneous inversion method based on elastic impedance is *** method integrates the differential effective medium model of multiple-porosity rocks,Gassmann equation,Amplitude Versus Offset(AVO)theory,Bayesian theory,and a nonlinear inversion algorithm to achieve the simultaneous quantitative prediction of the pore structure and physical parameters of complex porous *** forward modeling indicates that the contribution of the pore structure,i.e.,the pore aspect ratio,to the AVO response and elastic impedance is second only to that of porosity and is far greater than that of water *** application to real data shows that the new inversion method for determining the pore structure and physical parameters directly from pre-stack data can accurately predict a reservoir's porosity and water saturation and can evaluate the pore structure of the effective reservoir.

关键词： Carbonate rocks Pore structure physical parameters Elastic impedance Nonlinear Rock-physics inversion

Correlation between the physical parameters and the electrochemical performance of a silicon anode in lithium-ion batteries

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Journal of Materiomics 2019年第2期5卷 164-175页

作者： Guobin Zhu Yan Wang Siming Yang Qunting Qu Honghe Zheng College of Energy&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhouJiangsu215006PR China

Lithium-ion battery anode used as silicon particles were obtained from different major suppliers,and they were characterized by different spectroscopic techniques and evaluated by electrochemical *** between the key physical parameters and electrochemical properties of the silicon particles were *** particle size,surface oxygen content,-OH content and physical appearance are found to strongly influence the electrochemical properties of the Si *** particle size of 100 nm has great promise for the practical application of Si nanoparticles in the lithium-ion battery *** inverse correlation between the oxygen content and the reversible capacity or first coulombic efficiency was ***-OH content by surface treatment contributes to enhanced cycling stability by the improved affinity between the Si particle and the water-soluble *** Si particles perform better compared to irregular particles,and agglomeration dramatically decreases the cycling stability of the Si *** the investigated Si particles,the sample that exhibited a reversible capacity of more than 2500 mAh g^(-1),a first coulombic efficiency of 89.26%and an excellent cycling stability,has great potential for use in the battery industry.

关键词： Lithium ionbatteries Silicon anode physical parameters Particle size Surface condition

Effects of Seasonal Variations in physical parameters on Quality of Gravity Flow Water in Kyanamira Sub-County, Kabale District, Uganda

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Journal of Water Resource and Protection 2016年第13期8卷 1297-1309页

作者： Hannington Ngabirano Denis Byamugisha Emmanuel Ntambi Department of Chemistry Kabale University Kabale Uganda Department of Chemistry Mbarara University of Science and Technology Mbarara Uganda

The effect of seasonal variations in physical parameters on quality of gravity flow water was investigated in Kyanamira Sub-County, Kabale District, Uganda. The seasonal variations in the physical parameters (pH, temperature, electrical conductivity (EC), turbidity, colour, total dissolved solids (TDS), and total suspended solids (TSS)) were determined during wet and dry seasons. Composite samples from gravity flow water sources were collected monthly from March to August, 2014 and then analyzed. Temperature was measured using thermometer;pH, EC and TDS were determined using a multimeter, turbidity, colour and total suspended solids were determined by spectrophotometric method. TDS, pH and temperature were the most contributing parameters to water quality variations in both seasons. The mean pH values varied between 3.78 - 4.84 from March to August, 2014 at all study sites. These pH values were consistently below the WHO permissible range of 6.5 - 8.5. Similarly, total suspended solids varied between 0.66 - 2.17 mg·L-1 and were well above the recommended WHO limit of zero mg·L-1 at all study sites. Turbidity mean values varied between 0.83 - 3.7 NTU and were outside the recommended limits of 3 NTU at Kigata (3.7 NTU) only. Temperatures (20.3°C - 21.15°C) for all the study sites were within the recommended limit of 20°C - 30°C in water for domestic purposes. The mean values of physical parameters for the wet season were: temperature (21.12°C), colour (12.5 PtCoU), turbidity (3.4 NTU), TDS (76.76 mg·L-1), TSS (2.13 mg·L-1), pH (4.19) and EC (152.7 μS·cm-1) were different from those of the dry season (temperature (20.99°C), colour (0.93 PtCoU), turbidity (0.53 NTU), TDS (77.33 mg·L-1), TSS (0.67 mg·L-1), pH (4.86) and EC (158.65 μS·cm-1). Basing on these findings above, it was evident to justify discouraging the use of gravity flow water at these study sites for domestic purpose

关键词： Kyanamira Sub-County Seasonal Variations Gravity Flow Water physical parameters

Correlation Analysis of Processing Technology,physical parameters and Chemical Components during Plain Stir-baking of Trichosanthis Radix

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Medicinal Plant 2021年第5期12卷 51-55,59页

作者： Xinhong ZHAO Ruiying LI Chao SUN Zhenhua LIU Xu XIAO Tianchao CHEN Department of Pharmacy the Affiliated Hospital of Chengde Medical College Chengde 067000 China Department of Pharmacy Xuchang City Hospital of Traditional Chinese Medicine Xuchang 461000 China Department of Pharmacy the First Affiliated Hospital of Henan University of Traditional Chinese Medicine Zhengzhou 450000 China

[Objectives]To explore the correlation of processing technology,physical parameters and chemical components during plain stir-baking of Trichosanthis Radix.[Methods]Based on mixture uniform experiment design,the Trichosanthis Radix was prepared by plain stir-bake *** method was used to evaluate and select the highest-scoring processed product for measuring physical *** spectrophotometry was used to determine the contents of starch and *** correlation and linear regression model of processing technology,physical parameters and chemical components were established with the aid of SPSS 26.0[Results]After processing by plain stir-bake method,the relative density and chromaticity showed a decreasing trend in the processed products of Trichosanthis Radix,the oxidation value,hydroscopic rate and swelling decreased firstly and then increased,and pH increased firstly and then *** content of total starch decreased,the content of polysaccharide increased,and there was a negative correlation between *** was a significant positive correlation between temperature and oxidation value,swelling and hydroscopic rate,hydroscopic rate and polysaccharide,and there was a significant negative correlation between relative density and hydroscopic rate or polysaccharide,total starch and hydroscopic rate or *** linear relation model between processing technology and physical parameters and chemical components was r2>0.9.[Conclusions]After processing by plain stir-bake method,the physical parameters of Trichosanthis Radix changed,and there may be mutual conversion between total starch and *** a certain extent,physical parameters can be used to evaluate the quality of processed products of Trichosanthis *** study is expected to provide a reference for research on quality evaluation of processed products of traditional Chinese medicine.

关键词： Trichosanthis Radix Processing technology physical parameters Chemical components Correlation

Comprehensive insights into recent innovations:Magnesium-inclusive high-entropy alloys

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Journal of Magnesium and Alloys 2024年第4期12卷 1311-1345页

作者： Andrii Babenko Ehsan Ghasali Saleem Raza Kahila Baghchesaraee Ye Cheng Asif Hayat Peng Liu Shuaifei Zhao Yasin Orooji Shandong Vocational and Technical University of International Studies Rizhao 276826China Zhejiang Normal University Jinhua 321004China Geelong Institute for Frontier MaterialsDeakin UniversityVIC 3216Australia

This review focuses on thermodynamic and physical parameters,synthesis methods,and reported phases of Magnesium(Mg)containing high-entropy alloys(HEAs).Statistical data of publications concerning Mg-containing HEAs were collected and *** on the chemical elements included in Mg-containing HEAs,their theoretical end experimental densities,thermodynamic parameters,physical parameters,fabricated techniques and reported phases were also collected and *** the basis of this information,a new classification for HEAs was *** is also shown that the existing thermodynamic parameters cannot accurately predict the formation of a single phase solid solution for Mg-containing *** physical parameters of Mg-containing HEAs are within a wide range,and most of the synthesized Mg-containing HEAs have a complex multiphase structure.

关键词： Magnesium High-entropy alloys Classification Thermodynamic parameters physical parameters

Total ionizing dose effect modeling method for CMOS digital-integrated circuit

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Nuclear Science and Techniques 2024年第2期35卷 32-46页

作者： Bo Liang Jin-Hui Liu Xiao-Peng Zhang Gang Liu Wen-Dan Tan Xin-Dan Zhang School of Computer Science and Technology Xidian UniversityXi’an 710071China

Simulating the total ionizing dose(TID)of an electrical system using transistor-level models can be difficult and expensive,particularly for digital-integrated circuits(ICs).In this study,a method for modeling TID effects in complementary metaloxide semiconductor(CMOS)digital ICs based on the input/output buffer information specification(IBIS)was *** digital IC was first divided into three parts based on its internal structure:the input buffer,output buffer,and functional *** of these three parts was separately *** the IBIS model,the transistor V-I characteristic curves of the buffers were processed,and the physical parameters were extracted and modeled using *** the functional area,logic functions were modeled in VHDL according to the data sheet.A golden digital IC model was developed by combining the input buffer,output buffer,and functional area ***,the golden ratio was reconstructed based on TID experimental data,enabling the assessment of TID effects on the threshold voltage,carrier mobility,and time series of the digital *** experiments were conducted using a CMOS non-inverting multiplexer,NC7SZ157,and the results were compared with the simulation results,which showed that the relative errors were less than 2%at each dose *** confirms the practicality and accuracy of the proposed modeling *** TID effect model for digital ICs developed using this modeling technique includes both the logical function of the IC and changes in electrical properties and functional degradation impacted by TID,which has potential applications in the design of radiation-hardening tolerance in digital ICs.

关键词： CMOS digital-integrated circuit Total ionizing dose IBIS model Behavior-physical hybrid model physical parameters

Determination and analysis of basic physical and contact mechanics parameters of quinoa seeds by DEM

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International Journal of Agricultural and Biological Engineering 2023年第5期16卷 35-43页

作者： Linrong Shi Wuyun Zhao Bugong Sun Wei Sun Gang Zhou College of Mechanical and Electrical Engineering Gansu Agricultural UniversityLanzhou 730070China Institute of Dryland Agriculture Gansu Academy of Agricultural SciencesLanzhou 730070China

Quinoa is an ancient crop that is nutritious,balanced,and suitable for most ***,it has not been known and sought by the public until modern *** recent years,quinoa has been intensively known and widely grown in *** mechanized production machines have also been *** the help of DEM,we design and optimize the quinoa combined seeder,improving seeding efficiency and *** this paper,the basic physical and contact mechanics parameters required for the Hertz-Mindlin(no slip)of quinoa seeds in EDEM software were *** coefficient of rolling friction of quinoa seeds was calibrated on DEM,and which of Long Quinoa 4 is 0.043,and that of Meng Quinoa 4 was ***,we can find that the coefficient of rolling friction strengthens the shape to restrict rolling and weakens the shape to increase *** above research provides simulation parameters for the design and optimization of quinoa seed seeding machinery.

关键词： quinoa seeds physical parameters contact parameters calibration DEM

A New Sensitivity Analysis Approach Using Conditional Nonlinear Optimal Perturbations and Its Preliminary Application

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Advances in Atmospheric Sciences 2023年第2期40卷 285-304页

作者： Qiujie REN Mu MU Guodong SUN Qiang WANG State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China

Simulations and predictions using numerical models show considerable uncertainties,and parameter uncertainty is one of the most important *** is impractical to improve the simulation and prediction abilities by reducing the uncertainties of all ***,identifying the sensitive parameters or parameter combinations is *** study proposes a novel approach:conditional nonlinear optimal perturbations sensitivity analysis(CNOPSA)*** CNOPSA method fully considers the nonlinear synergistic effects of parameters in the whole parameter space and quantitatively estimates the maximum effects of parameter uncertainties,prone to extreme *** of the analytical g-function test indicate that the CNOPSA method can effectively identify the sensitivity of *** results of the theoretical five-variable grassland ecosystem model show that the maximum influence of the simulated wilted biomass caused by parameter uncertainty can be estimated and computed by employing the CNOPSA *** identified sensitive parameters can easily change the simulation or prediction of the wilted biomass,which affects the transformation of the grassland state in the grassland *** variance-based approach may underestimate the parameter sensitivity because it only considers the influence of limited parameter samples from a statistical *** study verifies that the CNOPSA method is effective and feasible for exploring the important and sensitive physical parameters or parameter combinations in numerical models.

关键词： physical parameters parameter uncertainty sensitivity analysis nonlinear optimization land-surface process

Comprehensive Recovery of Tin, Sulfur and Arsenic from Mixed Mineral of Tin, Sulfur and Arsenic

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Journal of Rare Earths 2004年第S1期22卷 40-45页

作者：张宗华张桂芳 College of Land Resources Engineering Kunming University of Science and Technology Kunming 650093 China

A mixed mineral of tin, sulfur and arsenic was studied in this paper. The main components of the mineral were separated and the physical parameters of each mineral were measured. Comprehensive recovery of tin, sulfur and arsenic from the mixed mineral was studied. A joint flowsheet of flotation and gravity was developed according to the mineralogical characteristics of the sample. Flotation was carried out first to produce sulfur concentrate while the tailing was processed by a second flotation to obtain rougher arsenic concentrate which was further processed by gravity separation to get arsenic concentrate and the tailing of gravity separation was processed to obtain tin concentrate.

关键词： mineral-dressing mixed mineral physical parameters comprehensive recovery