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Chemical modification of barite for improving the performance of weighting materials for water-based drilling fluids

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Petroleum Science 2024年第1期21卷 551-566页

作者： Li-Li Yang Ze-Yu Liu Shi-bo wang Xian-bo He Guan-cheng Jiang Jie Zhang MOE Key Laboratory of Petroleum Engineering State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Changping DistrictBeijing102249China MOE Key CNPC Drilling Research Institute Changping DistrictBeijing102206China

With increasing drilling depth and large dosage of weighting materials,drilling fluids with high solid content are characterized by poor stability,high viscosity,large water loss,and thick mud cake,easier leading to reservoir damage and wellbore *** this paper,micronized barite(MB)was modified(mMB)by grafting with hydrophilic polymer onto the surface through the free radical polymerization to displace conventional API barite *** suspension stability of water-based drilling fluids(WBDFs)weighted with API barite:mMB=2:1 in 600 g was significantly enhanced compared with that with API barite/WBDFs,exhibiting the static sag factor within 0.54 and the whole stability index of *** viscosity and yield point reached the minimum,with a reduction of more than 40%compared with API barite only at the same *** multi-stage filling and dense accumulation of weighting materials and clays,filtration loss was decreased,mud cake quality was improved,and simultaneously it had great reservoir protection performance,and the permeability recovery rate reached 87%.In addition,it also effectively improved the lubricity of *** sticking coefficient of mud cake was reduced by 53.4%,and the friction coefficient was ***,mMB can serve as a versatile additive to control the density,rheology,filtration,and stability of WBDFs weighted with API barite,thus regulating comprehensive performance and achieving reservoir protection *** work opened up a new path for the productive drilling of extremely deep and intricate wells by providing an efficient method for managing the performance of high-density WBDFs.

关键词： Drilling fluids Weighting materials Filtration control Reservoir protection Stability property

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Shape Optimization of Pressure Vessel Head Based on the Super-ellipse Equation

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Journal of Harbin Institute of Technology(New Series) 2013年第4期20卷 52-62页

作者： Yi-Ming Zhou bo wang Geng-Dong cheng State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology

This paper studies optimal shape design of pressure vessel head subject to internal uniform *** optimization aims at minimizing its maximum stress while the volume of the vessel head remains no less than the standard ellipsoidal ***-ellipse curve is selected to describe the middle surface shape of the vessel head because it represents a large family of curves with only two or three parameters and makes the design and manufacture *** performance of different elements and element sizes of FEM modeling is carefully studied in view of computational cost,accuracy and noises of von Mises *** response surface of the maximum stress *** design parameters is approximated by a Kriging surrogate model with EI criterion for sampling adding,based on the parameter optimization which is carried out to search the optimal ***,it is shown by numerical comparison that the super-ellipsoidal head is better than the standard ellipsoidal head and the other vessel heads in the literature.

关键词： shape optimization super-ellipse function Kriging pressure vessel head sampling criterion

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Enhancing Hydrocarbon-Rich Bio-Oil Production via Catalytic Pyrolysis Fortified with Microorganism Pretreatment

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Journal of Renewable Materials 2023年第10期11卷 3595-3612页

作者： Jiapeng wang bo Zhang Haoqiang cheng Zhixiang Xu Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing210096China School of Energy and Power Engineering Jiangsu UniversityZhenjiang212013China

A new method of pretreatment of corn straw with Phanerochaete chrysosporium combined with pyrolysis was proposed to improve the quality of *** characterization results demonstrated that microbial pretreatment was an effective method to decrease the lignin,which can achieve a maximum removal rate of 44.19%.Due to the destruction of biomass structure,the content of alkali metal and alkaline earth metal is ***,the depolymerized biomass structure created better pyrolysis conditions to promote the pyrolysis efficiency,increase the average decomposition rate of pyrolysis and reduce the *** fast pyrolysis,because of the enrichment of cellulose and the removal of lignin,the contents of acids,linear carbonyls,furans,and sugars increased while the contents of phenols *** for the catalytic pyrolysis,due to the hydrocarbon pool reaction and shape selection deoxidation of ZSM-5 catalyst,the total hydrocarbon and aromatics contents can significantly increase up to 34.37%and 30.59%,respectively,with 3 weeks of *** the the low molecular content of bio-oil increased after pretreatment,which can significantly benefit the entry of primary pyrolysis steam into the catalyst pores to improve the catalytic efficiency and hydrocarbon *** method provides a new treatment idea for high-quality utilization of biomass.

关键词： Corn straw lignin Phanerochaete chrysosporium pretreatment aromatics

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A Luminescent Cd(Ⅱ) Coordination Polymer Constructed from Isophthalic Acid and 1,3-Bis-(4-pyridyl)propane

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Chinese Journal of Structural Chemistry 2015年第6期34卷 925-930页

作者： XU bo LI Zhi-wang JIANG Yang LI Cun-cheng Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong (University of Jinan) School of Chemistry and Chemical Engineering University of Jinan

A new coordination complex [Cd2（ip）2（bpp）]n （1, H2ip = isophthalic acid, bpp = 1,3-bis-（4-pyridyl） propane） has been synthesized and structurally characterized. Crystal data for the title complex are as follows： triclinic system, space group Pi with a = 9.6724（6）, b = 10.2243（6）, c = 14.8205（9） A, a = 88.927（5）, β = 71.664（6）, ）, = 75.767（5）°, F= 1345.79（14） A3, Mr = 751.29, Z= 2, F（000） = 740, Dc = 1.854 g/cm^3,μ（MoKa） = 1.636 mm^-1, R = 0.0259 and wR = 0.0623 for 4754 observed reflections with I 〉 20（0. X-ray structure analysis reveals that complex 1 holds a 3D architecture based on a-Po primitive cubic units with the [Cd4（COO）8] units treated as 6-connected nodes. Solid-state properties for 1, such as infrared spectroscopy, elemental analyses, thermal stability and luminescent property, have also been investigated.

关键词： coordination polymer crystal structure luminescence mixed-ligand approach

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Proactive Personalized Services Through Fog-Cloud Computing in Large-Scale IoT-Based Healthcare Application

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China Communications 2017年第11期14卷 1-16页

作者： Shuqing He bo cheng Haifeng wang Yuze Huang Junliang Chen State Key Lab.of Networking & Switching Technology Beijing University of Posts & Telecommunications School of Information Science & Technology Linyi University

With the development of medical sensors and IoT, personalized service assisted elder and patient living is a critical service in IoT-based healthcare application. However, the scale and complexity of personalized service is increasing because of ubiquitous deployment of various kinds of medical sensors, which cause response time increase and resource waste. Therefore, leveraging the advantage of complex event processing(CEP) in data stream processing, we propose a hierarchical fog-cloud computing CEP architecture for personalized service to accelerate response time and reduce resource waste. Firstly, we introduce the proposed architecture, which includes sensor layer, fog layer and cloud layer. Secondly, we propose a series of optimizations for the architecture, there are a partitioning and clustering approach and a communication and parallel processing policy to optimize the fog and cloud computing. Finally, we implement a prototype system based on the architecture named Fog Cep Care. Experimental result shows that Fog Cep Care is superior to the traditional IoT-based healthcare application.

关键词： personalized services fog computing complex event pattern IoT-based healthcare application

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Multiple Positive Solutions for Semi-positone m-point boundary Value Problems

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Acta Mathematicae Applicatae Sinica 2011年第3期27卷 419-426页

作者： cheng-bo Zhai cheng Yang School of Mathematical Science Shanxi University Shanxi 030006 China Business College of Shanxi University Shanxi 030031 China

In this article, we establish the existence of at least two positive solutions for the semi-positone m-point boundary value problem with a parameter u （t）＋ λf （t, u） = 0, t ∈ （0, 1）, u （0） = sum （biu （ξ i ）） from i=1 to m-2, u（1）= sum （aiu（ξ i ）） from i=1 to m-2, where λ 〉 0 is a parameter, 0 〈 ξ 1 〈 ξ 2 〈 ··· 〈 ξ m 2 〈 1 with 0 〈sum ai from i=1 to m-2 〈 1, sum bi from i=1 to m-2 =1 b i 〈 1, a i , b i ∈ [0, ∞） and f （t, u） ≥ M with M is a positive constant. The method employed is the Leggett-Williams fixed-point theorem. As an application, an example is given to demonstrate the main result.

关键词： Multiple positive solutions cone semi-positone m-point boundary value problem,concave functional parameter

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Effect of projectile parameters on opening behavior of PELE penetrating RC target

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Defence Technology（防务技术） 2021年第3期17卷 859-873页

作者： Li-zhi Xu cheng-xin Du Chun cheng Xiao-dong wang Jiang-bo wang Zhong-hua Du Guang-fa Gao School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China

When a penetrator with enhanced lateral effect(PELE) impacts on a reinforced concrete(RC) target,the target is damaged with a large *** understanding of how PELE projectile parameters affect the opening dimension,is essential for effective design of the PELE *** this study,under the condition that the impact velocity and target parameters(strength and thickness) were fixed values,the important influence factors of the PELE(jacket wall thickness B,jacket material strength Y1,filling material strength Y2 and angle of monolithic jacket θ) were determined by a dimensional *** and simulations of the PELE penetrating the RC target were conducted to analyze the influence of these factors on opening diameter(D,an equivalent diameter under relative kinetic energy).Based on the test and simulation results,it is found that the influence of these factors B,Y1 and θ on the deformation mode of the jacket shows a similar trend:as values of the three factors decrease,the jacket deforms from small bending deformation to large one,and then to curling *** causes the opening diameter to first increase with the decrease of these three factors,and then *** is well known that the bending resistance of the jacket is related to these factors B,Y1 and θ.Therefore,a plastic limit bending moment(M0) of the jacket was quoted to characterize the influence of these factors on the bending deformation of the jacket and the opening diameter of the *** influence factor Y2 causes D to first increase with the increase of Y2,and then decreases.A formula was developed to predict the opening diameter,whose influence parameters were considered in a dimensionless *** has been shown that the dimensionless opening diameter D/d1 is dependent on two dimensionless parameters■ and■,where d1 and fc are the outer diameter of the projectile and the compressive strength of the target,respectively.

关键词： Penetrator with enhanced lateral effect Opening behaviour Reinforced concrete target Dimensional analysis

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Accreting He-rich material onto carbon-oxygen white dwarfs until explosive carbon ignition

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Research in Astronomy and Astrophysics 2016年第10期16卷 93-98页

作者： cheng-YuanWu Dong-Dong Liu Wei-Hong Zhou bo wang Yunnan Observatories Chinese Academy of SciencesKunming 650216China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beiiing 100049China Yunnan Minzu University Kunming 650031China

Type Ia supernovae （SNe Ia） play an important role in studies of cosmology and galactic chemi- cal evolution. They are believed to be thermonuclear explosions of carbon-oxygen white dwarfs （CO WDs） when their masses approach the Chandrasekar （Ch） mass limit. However, it is still not completely under- stood how a CO WD increases its mass to the Ch-mass limit in the classical single-degenerate （SD） model. In this paper, we studied the mass accretion process in the SD model to examine whether the WD can explode as an SN Ia. Employing the stellar evolution code called modules for experiments in stellar as- trophysics （MESA）, we simulated the He accretion process onto CO WDs. We found that the WD can increase its mass to the Ch-mass limit through the SD model and explosive carbon ignition finally occurs in its center, which will lead to an SN Ia explosion. Our results imply that SNe Ia can be produced from the SD model through steady helium accretion. Moreover, this work can provide initial input parameters for explosion models of SNe Ia.

关键词： stars: evolution -- binaries: close -- supernovae: general -- white dwarfs

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Recovery and regeneration of LiFePO_(4)from spent lithium-ion batteries via a novel pretreatment process

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1478-1487页

作者： cheng Yang Jia-liang Zhang Qian-kun Jing Yu-bo Liu Yong-qiang Chen cheng-yan wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Green Recycling and Extraction of Metals Beijing 100083China School of Metallurgy Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

The recycling of spent LiFePO_(4)batteries has received extensive attention due to its environmental impact and economic *** the pretreatment process of spent LiFePO_(4)batteries,the separation of active materials and current collectors determines the difficulty of the re-covery process and product *** this work,a facile and efficient pretreatment process is first *** only freezing the electrode pieces and immersing them in boiling water,LiFePO_(4)materials were peeled from the Al ***,after roasting under an inert atmosphere and sieving,all the cathode and anode active materials were easily and efficiently separated from the Al and Cu *** active materials were subjected to acid leaching,and the leaching solution was further used to prepare FePO_(4)and Li_(2)CO_(3).Finally,the battery-grade FePO_(4)and Li_(2)CO_(3)were used to re-synthesize LiFePO_(4)/C via the carbon thermal reduction *** discharge capacities of re-synthesized LiFePO_(4)/C cathode were 144.2,139.0,133.2,125.5,and 110.5 mA·h·g−1 at rates of 0.1,0.5,1,2,and 5 C,which satisfies the requirement for middle-end LiFePO_(4)*** whole process is environmental and has great potential for industrial-scale recycling of spent lithium-ion batteries.

关键词： spent lithium iron phosphate batteries pretreating process recovery regeneration cathode materials

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Surface tuning of LaCoO_(3) perovskite by acid etching to enhance its catalytic performance

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Rare Metals 2021年第3期40卷 555-562页

作者： Lu Dai Xin-bo Lu Guo-Hai Chu cheng-Huan He wang-cheng Zhan Guo-Jun Zhou China Tobacco Zhejiang Industrial Co. LtdHangzhou 310024China Research Institute Catalysis School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

The stoichiometric LaCoO_(3) and nonstoichiometric LaCo_(1.2)O_(3) perovskite catalysts were prepared by citric acid sol-gel method,and then,LaCoO_(3) perovskite was etched with nitric *** structure,surface composition and reducibility of the catalyst were studied by X-ray diffraction(XRD),nitrogen desorption,transmission electron microscope(TEM),temperature program reduction of H_(2)(H_(2)-TPR) and X-ray photoelectron spectroscopy(XPS).It was found that nitric acid etching did not change the crystal structure and the overall morphology of the LaCoO_(3) catalyst,but it can cause the exposure of B-site Co metal to the surface of the *** a result,after acid etching,the reducibility of the LaCoO_(3) catalyst was improved,leading to the improvement in the catalytic activity of the LaCoO_(3) catalyst for CO oxidation and C_(3)H_(8) ***,the catalytic activity of the LaCoO_(3) catalyst after acid etching was higher than that of LaCo_(1.2)O_(3) and CoOx/LaCoO_(3) catalyst.

关键词： Perovskite oxide Acid etching CO oxidation Propane combustion

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