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Modeling and Analysis for Supply Chain Using Stochastic Process Algebra

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Journal of Harbin Institute of Technology(New Series) 2014年第6期21卷 74-80页

作者： Yong-Tao Huang Min Lv Gang Wang Bing-Yin Ren Hao-Yun Zhang School of Mechatronics Engineering Harbin Institute of Technology henan tongli cement co. Ltd.

In order to improve the influence of the uncertain and dynamic of node enterprise behavior on the performance of supply chain,the method based on stochastic process algebra for description,analysis,validation and evaluation of supply chain business process model is ***,the description of the uncertainty of node enterprise behavior is given using the extended Unified Modeling Language sequence diagram,and mapping rule is defined from the extended Unified Modeling Language sequence diagram to stochastic process ***,on the basis of the acquired stochastic process algebra model,the supply chain business process model is verified with Mobility ***,acco.ding to the operational semantics of stochastic process algebra,the co.tinuous-time Markov chain,isomorphic with stochastic process algebra model,is built; and the system performance evaluation of transient status and stable status is respectively co.ducted in acco.dance with Markov transfer relations and the current state of system,obtaining the predicted performance value and average performance index value for a specific period of *** simulation experiments show that the proposed method can accurately describe the stochastic behaviors of supply chain system and interactions among nodes,effectively verify the validity of the model,and objectively and exactly evaluate design of the supply chain.

关键词： supply chain stochastic process algebra business process performance evaluation Markov chain

Dredged marine soil stabilization using magnesia cement augmented with biochar/slag

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 1000-1017页

作者： Chikezie Chimere Onyekwena Qi Li Yong Wang Ishrat Hameed Alvi Wentao Li Yunlu Hou Xianwei Zhang Min Zhang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China School of Urban co.struction Wuhan University of Science and TechnologyWuhan430065China School of Civil Engineering and Archtitecture Henan UniversityKaifeng475001China

Dredged marine soils(DMS)have poor engineering properties,which limit their usage in co.struction *** research examines the application of reactive magnesia(rMgO)co.taining supplementary cementitious materials(SCMs)to stabilize DMS under ambient and carbon dioxide(co.(2))curing *** proprietary experimental tests were co.ducted to investigate the stabilized ***,the carbonation-induced mineralogical,thermal,and microstructural properties change of the samples were *** findings show that the co.pressive strength of the stabilized DMS fulfilled the 7-d requirement(0.7-2.1 MPa)for pavement and building *** rMgO with SCMs such as biochar or ground granulated blast-furnace slag(GGBS)altered the engineering properties and particle packing of the stabilized soils,thus influencing their *** increased the porosity of the samples,facilitating higher co.(2) uptake and improved ductility,while GGBS decreased porosity and increased the dry density of the samples,resulting in higher *** addition of SCMs also enhanced the water retention capacity and modified the pH of the *** analysis revealed that the hydrated magnesium carbonates precipitated in the carbonated samples provided better cementation effects than brucite formed during rMgO ***,inco.porating SCMs reduced the overall global warming potential and energy demand of the rMgO-based *** biochar mixes demonstrated lower toxicity and energy ***,the rMgO and biochar blend can serve as an environmentally friendly additive for soft soil stabilization and permanent fixation of significant amounts of co.(2) in soils through mineral carbonation,potentially reducing environmental pollution while meeting urbanization needs.

关键词： Dredged marine soil co.(2)uptake Reactive magnesia Biochar Ground granulated blast-furnace slag

Durability of Green co.crete in Severe Environment

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Journal of Renewable Materials 2023年第4期11卷 1895-1910页

作者： Yonggan Yang Zihao Kang Binggen Zhan Peng Gao Qijun Yu Yanlai Xiong Jingfeng Wang Yunsheng Zhang School of Civil Engineering Hefei University of TechnologyHefei230009China henan Key Laboratory of Materials on Deep-Earth Engineering Henan Polytechnic UniversityJiaozuo454000China Anhui Key Laboratory of Civil Engineering Structure and Materials Hefei University of TechnologyHefei230009China Hefei cement Research and Design Institute co. Ltd.Hefei230051China co.lege of Civil Engineering Lanzhou University of TechnologyLanzhou730050China

In this paper,the effects of different mineral admixtures and sulfate solution types on the appearance,mass change rate,relative dynamic elastic modulus,and co.rosion resistance co.fficient of co.crete were systematically studied.X-ray Diffraction(XRD),Mercury Intrusion Porosimetry(MIP),Scanning Electron Microsco.y(SEM),and X-ray co.puted Tomography(X-CT)were used to explore and analyze the changes in the microstructure and the co.rosion products of co.crete in the sulfate *** results show that the existence of magnesium ions accelerates co.crete *** is a critical dosage of fly ash for magnesium sulfate resistance of *** magnesium sulfate resistance of co.crete is improved when the fly ash co.tent is less than 20%.Slag can significantly improve the co.rosion resistance of co.crete to magnesium *** diffusion of sulfate ions into co.crete is a gradual *** the early stages of co.rosion,sulfate ion co.tent in the co.crete immersed in the magnesium sulfate solution is slightly less than that of the co.crete immersed in the sodium sulfate ***,in the later stage of co.rosion,the sulfate ion co.tent in the co.crete immersed in the magnesium sulfate solution is significantly higher than that of the co.crete immersed in the sodium sulfate solution.

关键词： Green co.crete sulfate attack deterioration law microstructure

Characteristic of Fresh and Harden Properties of Polyvinyl Alco.ol Fibre Reinforced Alkali Activated co.posite

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Journal of Renewable Materials 2023年第3期11卷 1321-1337页

作者： Yiguang Wang Zhe Zhang Xun Zhang School of Civil Engineering Zhengzhou UniversityZhengzhou450001China henan Provincial co.munications Planning Survey&Design Institute Co.Ltd.Zhengzhou450001China

Fibre can enhance the mechanical properties of cement-based co.posites,but fibre also degrades their ***,the quantitative effects of fiber co.tent and length-diameter ratio on alkali-activated materials are still *** aspect ratio,volume fraction of polyvinyl alco.ol fibre(PVAF),and various water-binder ratio were employed to prepare a total of 26 groups of fibre reinforced alkali-activated co.posite(FRAAC).The influence of PVAF fibre factor(product of fiber volume fraction and length-diameter ratio)on flowability,co.pactness,strength,and crack fractal dimension of FRAAC was *** influence of water-binder ratio on the plastic visco.ity of FRAAC was more significant than that on the yield *** fibre factor was lower than critical value of 150,the influence of fibres co.ld be *** reason was that the space between fibres was distant,so the flowability of FRAAC was not impacted by *** this time,fibres were challenging to restrict the cracks in matrix and increase their mechanical *** fibre factor was higher than critical value 150 and lower than density packing value 450,the flexural strength,co.pressive strength and crack fractal dimension of FRAAC were co.siderably enhanced,and the FRAAC co.ld still flow easily under dead *** fibre factor were above 450,noteworthy fibre balling co.siderably decreased the flowability,leading to poor solidity and reduced co.pressive ***,the ideal co.tent of PVAF in alkali activated co.posite is between 150/(l/d)and 450/(l/d).

关键词： Alkali-activated co.posite fibre reinforced co.posite fibre factor flowability strength fractal dimension

Chloride co.rosion of Reinforced Calcium Aluminate cement Mortar

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 79-87页

作者：陈钰婷吴凯徐玲琳 WANG Zhongping ZHAO Yating ZHU Zheyu Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghai 201804China henan Provincial co.munications Planning&Design Institute co. LtdZhengzhou 450052China

This paper describes a study on the co.rosion behavior of steel reinforcement in CAC mortars via electrochemical methods including co.rosion potential,electrochemical impedance,and linear polarization *** indicate that there is a non-linear relationship between the co.rosion degree of steel reinforcement in CAC mortar and the co.centration of NaCl *** electrochemical parameters of specimens immersed in 3%NaCl solution suddenly drop at 40 days,earlier than 60 days of the *** the charge transfer resistivity of the specimen has decreased by 11 orders of magnitude at 40 days,showing an evident co.rosion on steel ***,it is interesting to notice that the co.rosion is delayed by high external chloride *** specimens immersed in 9%and 15%NaCl solutions remain in a relatively stable state within 120 days with slight *** great co.rosion protection of CAC co.crete to embedded steel bars enables its wide application in marine.

关键词： electrochemical impedance calcium aluminate cement mortar chloride co.rosion

Salt freezing resistance improvement of cement-based materials inco.porated with calcined layered double hydroxide

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第3期10卷 427-440页

作者： Jinyang Huo Tonghuan Zhang Zhenjun Wang Xiaofeng Wang Xin Ji Pei Wang School of Materials Science and Engineering Chang'an UniversityXi'an 710064China Engineering Research Center of Transportation Materials of Ministry of Education Chang'an UniversityXi'an 710064China henan co.munications Planning&Design Institute co. Ltd.Zhengzhou 450052China

Salt freezing damage has severe impacts on durability of cement-based materials(CBMs).Calcined layered double hydroxide(CLDH),as an efficient environmental-friendly adsorption material,can impart excellent salt freezing resistance to *** this work,salt freezing resistance improvement of CBMs inco.porated with CLDH was experimentally evaluated by chloride binding capacity,mass loss rate,relative dynamic elastic modulus,setting time,co.pressive strength,and micro structure *** these,the salt freezing damage model was established to effectively express the quantitative relationship between influencing factors and evaluation indexes of the salt freezing resistance of *** show that CLDH can reco.struct its original layered structure to form reco.structed layered double hydroxide(RLDH).RLDH co.bines with chloride ions to form RLDH-Cl recrystallization,which can improve chloride binding capacity and pore structures of CBMs to relieve the salt freezing *** salt freezing damage model indicates that the suitable CLDH co.tent can evidently alleviate the salt freezing damage,which facilitates the quantitative analysis of the effect of CLDH on the salt freezing resistance of CBMs.

关键词： cement-based materials Calcined layered double hydroxide Salt freezing resistance Micro structure Salt freezing damage

Role of in-situ Formed Nonoxides Bonded Phases in Property Improvement of Alumina ULC Castables

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China's Refractories 2013年第1期22卷 17-20页

作者： YU Renhong DU Penghui ZHOU Ningsheng LI Cuixia High Temperature Materials Institute Henan University of Science and Technology Sinosteel Refractory co. Ltd

In order to enhance performance of pre-cast shapes of alumina based castables, the present work explored the approach of forming in-situ bonding phases by inco.porating Si powders and then heating in carbon, embedded atmosphere. Using tabular alumina as aggregates, tabular alumina, SiC powders, Si powders, calcium aluminate cenwnt, microsilica and ultrafine α-A12 03 powders as matrix, alumina based ultra low cement （ULC） castables were prepared. Influences of Si powder addition at O, 4% , 6% , 8% alul 10% （in nutss ） on regular properties, co.d modulus of rupture （CMOR）, hot modulus of rupture （HMOR）, thermal shock resistance （TSR） and microstructure of the castables after carbonization were investigated. After inco.poration of Si powders and carbon embedded heating, the in-situ mullite and nonoxide phases such as SiAION and SiC can be fornwd by oxidation, nitridation or carbomlzation reaction. HMOR and TSR of the castables with in-situ nonoxides bonding are obviously improted. After carbon embedded heating, the HMOR at 1 400 ℃ increases from 1.6 MPa to 8. 3 MPa, and the residual CMOR ratio after thermal shock increases from 64. 9% to 137. 9% when Si addition increases from 0 to 10%.

关键词： alumina based castables silico. powder carbon embedding carbonization nonoxide

Development of a High-Temperature Thixotropic cement Slurry System

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Fluid Dynamics & Materials Processing 2023年第11期19卷 2907-2921页

作者： Ping Lv Jiufei Liu Mengran Xu Hui Tian Huajie Liu Yuhuan Bu Zhuang Cai Junfeng Qu Institute of Petroleum Engineering Technology Sinopec Northwest Oil Field CompanyUrumqi830000China Xinjiang Branch of CNPC Chuanqing Drilling Engineering co.pany Limited Korla841000China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China Sinopec Shengli Petroleum Engineering co. Ltd.DongyingChina henan Science and Technology Innovation Promotion Center Zhenzhou450003China

cementing carbonate reservoirs is generally a difficult *** so-called thixotropic cement slurry has gained co.siderable attention in this regard as it can help tofix some notable *** precisely,it can easilyfill the leakage layer;moreover,its gelling strength can grow rapidly when pumping stops,thereby increasing the resistance to gas channeling,effectively preventing this undesired phenomenon in many ***-temperature thixotropic cement slurry systems,however,are still in an early stage of development and additional research is needed to make them a viable *** the present study,using a self-developed co.posite high-temperature thixotropic additive as a basis,it is shown that the co.pressive strength can be adjusted by tuning the proportion of silica sand,the high-temperature retarder,fluid loss additive and dispersant(co.patible with the thixotropic additive).Acco.ding to the tests,the developed high-temperature thixotropic cement slurry system has a 14 d co.pressive strength of 29.73 MPa at 150°C,and a thickening time of 330 min when the dosage of retarder is 2%.At the same time,the rheological property,water loss,permeability,water separation rate,and settlement stability of the cement slurry system meet the requirements of cementing co.struction.

关键词： High temperature resistance thixotropy cement slurry system

Effect of Calcium Chloride Addition on Properties of co.undum Spinel Castable

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China's Refractories 2020年第4期29卷 46-49页

作者： GUO Hongxiang SUN Xiaogai JIA Quanli LI Xueyan LIU Xinhong henan Key Laboratory of High Temperature Functional Ceramics Zhengzhou UniversityZhengzhou 450052China henan Hongda Furnace Industry co. Ltd.Zhengzhou 450000China

co.undum spinel castable was prepared using tabular co.undum as aggregates,white fused co.undum powder,spinel powder and alumina powder as the matrix,pure calcium aluminate cement as a binder,and extra adding calcium chloride(0,1%,2%,and 3%,by mass).The effects of the CaCl2 addition on the co.d physical properties,the hot strength,the thermal shock resistance and the microstructure of the castable were *** results show that,for the co.undum spinel castable fired at 1550℃,with the increase of the CaCl2 addition from 0 to 3%,the co.d strengthes first increase,then decrease,the apparent porosity increases,the volume density decreases,and the linear change rate first decreases and then increases,while the overall change is not significant;however,the hot modulus of rupture and the thermal shock resistance are obviously *** is mainly due to that,CaCl2 is evenly distributed in the castable in the form of solution,and reacts with Al2O3 to form small flake CA6 crystals,which evenly distributed in the sample matrix strengthening and toughening the material.

关键词： co.undum spinel castable calcium chloride calcium hexaluminate strength thermal shock resistance