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Combined use of fly ash and silica to prevent the long-term strength retrogression of oil well cement set and cured at HPHT conditions

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Petroleum Science 2024年第2期21卷 1122-1134页

作者： Guo-Dong Cheng xue-Yu Pang jin-Sheng Sun zheng-Song Qiu Chuang-Chuang Wang Jian-Kun Qin Ning Li School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina Oil and Gas Engineering Research Institute(Tarim Oilfield Company) China National Petroleum CorporationTarim841000XinjiangChina

The long-term strength retrogression of silica-enriched oil well cement poses a significant threat to wellbore integrity in deep and ultra-deep wells, which is a major obstacle for deep petroleum and geothermal energy development. Previous attempts to address this problem has been unsatisfactory because they can only reduce the strength decline rate. This study presents a new solution to this problem by incorporating fly ash to the traditional silica-cement systems. The influences of fly ash and silica on the strength retrogression behavior of oil well cement systems directly set and cured under the condition of 200°C and 50 MPa are investigated. Test results indicate that the slurries containing only silica or fly ash experience severe strength retrogression from 2 to 30 d curing, while the slurries containing both fly ash and silica experience strength enhancement from 2 to 90 d. The strength test results are corroborated by further evidences from permeability tests as well as microstructure analysis of set cement. Composition of set cement evaluated by quantitative X-ray diffraction analyses with partial or no known crystal structure(PONKCS) method and thermogravimetry analyses revealed that the conversion of amorphous C-(A)-S-H to crystalline phases is the primary cause of long-term strength *** addition of fly ash can reduce the initial amount of C-(A)-S-H in the set cement, and its combined use with silica can prevent the crystallization of C-(A)-S-H, which is believed to be the working mechanism of this new admixture in improving long-term strength stability of oil well cement systems.

关键词： Fly ash Long-term strength retrogression High temperature Quantitative X-ray diffraction(QXRD) Partial or no known crystal structure(PONKCS)

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Fe/S oxidation-coupled arsenic speciation transformation mediated by AMD enrichment culture under different pH conditions

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Journal of Environmental Sciences 2024年第3期137卷 681-700页

作者： Yu-hang Zhou Wei-xi Huang zhen-yuan Nie Hong-chang Liu Yue Liu Can Wang jin-lan Xia Wen-sheng Shu Key Lab of Biometallurgy of Ministry of Education of China School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China School of Life Sciences South China Normal UniversityGuangzhou 510631China

Arsenic(As)speciation transformation in acid mine drainage(AMD)is comprehensively affected by biological and abiotic factors,such as microbially mediated Fe/S redox reactions and changes in environmental conditions(pH and oxidation-reduction potential).However,their combined impacts on arsenic speciation transformation remain poorly ***,we explored arsenic transformation and immobilization during pyrite dissolution mediated by AMD enrichment culture under different acidic pH *** results for incubation and mineralogical transformation of solid residues show that in the presence of AMD enrichment culture,pH 2.0,2.5,and 3.0 are more conducive to the formation of jarosites and ferric arsenate,which could immobilize high quantities of dissolved arsenic by adsorption and *** pH conditions significantly affect the initial adsorption of microbial cells to the minerals and the evolution of microbial community structure,further infuencing the biodissolution of pyrite and the release and oxidation process of Fe/*** results of Fe/S/As speciation transformation of the solid residues show that the transformation of Fe,S,and As in solution is mainly regulated by pH and potential values,which imposed significantly different effects on the formation of secondary minerals and thus arsenic oxidation and *** above results indicated that arsenic transformation is closely related to the Fe/S oxidation associated with pyrite bio-oxidation,and this correlation is critically regulated by the pH conditions of the system.

关键词： Acid mine drainage(AMD) pH conditions Fe/S/As speciation transformation Microbial community structure

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Effect of microalloying on wettability and interface characteristics of Zr-based bulk metallic glasses with W substrate

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China Foundry 2024年第4期21卷 352-359页

作者： zhen Zhang Lin-na Feng jin-he Wang zheng-kun Li Hua-meng Fu Hong Li zheng-wang Zhu Hai-feng Zhang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110004China

The infiltration casting method is widely employed for the preparation of ex-situ composite ***,the production of composite materials using this method must necessitates a comprehensive understanding of the wettability and interface characteristics between the reinforcing phase and the bulk metallic glasses(BMGs).This work optimized the composition of Zr-based BMGs through microalloying methods,resulting in a new set of Zr-based BMGs with excellent glass-forming *** experiments between the Zr-based BMGs melts and W substrates were conducted using the traditional sessile drop method,and the interfaces were characterized utilizing a scanning electron microscope(SEM)equipped with energy dispersive X-ray spectroscopy(EDS).The work demonstrates that the microalloying method substantially enhances the wettability of the Zr-based BMGs ***,the incorporation of Nb element impedes the formation of W-Zr phases,but the introduction of Nb element does not alter the extent of interdiffusion between the constituent elements of the amorphous matrix and W element,indicating that the influence of Nb element on the diffusion of individual elements is minute.

关键词： Zr-based BMGs infiltration casting method wettability interface characteristics W-Zr phases

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Inhibiting MMP13 Attenuates Deep Vein Thrombosis in a Mouse Model by Reducing the Expression of Pdpn

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Current Medical Science 2024年第2期44卷 369-379页

作者： Ji LUO jin ZHOU jing-zeng LUO Hai-long WANG xue-ling ZHAO Ru-dan ZHOU Department of Intensive Care Unit The First People's Hospital of ZiyangZiyang 641300China Department of Orthopedics Kunming Medical University Second Affiliated HospitalKunming 650033China Department of Orthopedics Kunming Medical University First Affiliated HospitalKunming 650032China Department of Orthopedics The Third People's Hospital of Yunnan ProvinceKunming 650200China

Objective:Matrix metalloproteinase 13(MMP13)is an extracellular matrix protease that affects the progression of atherosclerotic plaques and arterial thrombi by degrading collagens,modifying protein structures and regulating inflammatory responses,but its role in deep vein thrombosis(DVT)has not been *** purpose of this study was to investigate the potential effects of MMP13 and MMP13-related genes on the formation of ***:We altered the expression level of MMP13 in vivo and conducted a transcriptome study to examine the expression and relationship between MMP13 and MMP13-related genes in a mouse model of *** screening genes possibly related to MMP13 in DVT mice,the expression levels of candidate genes in human umbilical vein endothelial cells(HUVECs)and the venous wall were *** effect of MMP13 on platelet aggregation in HUVECs was investigated in ***:Among the differentially expressed genes,interleukin 1 beta,podoplanin(Pdpn),and factor VIII von Willebrand factor(F8VWF)were selected for analysis in *** MMP13 was inhibited,the expression level of PDPN decreased significantly in *** HUVECs,overexpression of MMP13 led to an increase in the expression level of PDPN and induced platelet aggregation,while transfection of PDPN-siRNA weakened the ability of MMP13 to increase platelet ***:Inhibiting the expression of MMP13 could reduce the burden of DVT in *** mechanism involves downregulating the expression of Pdpn through MMP13,which could provide a novel gene target for DVT diagnosis and treatment.

关键词： deep vein thrombosis matrix metalloproteinase 13 podoplanin

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Valuation and comparison of the actual and optimal control strategy in an emerging infectious disease:Implication from a COVID-19 transmission model

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Infectious Disease Modelling 2024年第2期9卷 354-372页

作者： Lili Liu Xi Wang Ou Liu Yazhi Li zhen jin Sanyi Tang Xia Wang Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention Complex Systems Research CenterShanxi UniversityTaiyuan030006China School of Mathematical Sciences Shanxi UniversityTaiyuan030006China School of Mathematics and Statistics Qiannan Normal University for NationalitiesGuizhouDuyun558000China School of Mathematics and Statistics Shaanxi Normal UniversityXi'an710119China

To effectively combat emerging infectious diseases like COVID-19,it is crucial to adopt strict prevention and control measures promptly to effectively contain the spread of the *** this paper,we propose a transmission model to investigate the influence of two control strategies:reducing contact numbers and improving medical *** examine these strategies in terms of constant control and time-varying *** sensitivity analysis on two reproduction numbers of the model with constant control,we demonstrate that reducing contact numbers is more effective than improving medical ***,these two constant controls significantly influence the peak values and timing of ***,intensifying control measures can reduce peak values,albeit at the expense of delaying the peak *** the model with time-varying control,we initially explore the corresponding optimal control problem and derive the characteristic expression of optimal ***,we utilize real data from January 10th to April 12th,2020,in Wuhan city as a case study to perform parameter estimation by using our proposed improved *** findings illustrate that implementing optimal control measures can effectively reduce infections and deaths,and shorten the duration of the ***,we numerically explore that implementing control measures promptly and increasing intensity to reduce contact numbers can make actual control be more closer to optimized ***,we utilize the real data from October 31st to November 18th,2021,in Hebei province as a second case study to validate the feasibility of our proposed suggestions.

关键词： Emerging epidemic Transmission model Sensitivity analysis Actual control Optimal control

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Analytical solutions to the precession relaxation of magnetization with uniaxial anisotropy

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Chinese Physics B 2024年第4期33卷 656-660页

作者：张泽南贾镇林薛德胜 Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China

Based on the Landau-Lifshitz-Gilbert(LLG)equation,the precession relaxation of magnetization is studied when the external field H is parallel to the uniaxial anisotropic field H_(k).The evolution of three-component magnetization is solved analytically under the condition of H=nH_(k)(n=3,1 and 0).It is found that with an increase of H or a decrease of the initial polar angle of magnetization,the relaxation time decreases and the angular frequency of magnetization *** comparison,the analytical solution for H_(k)=0 is also *** the magnetization becomes stable,the angular frequency is proportional to the total effective field acting on the *** analytical solutions are not only conducive to the understanding of the precession relaxation of magnetization,but also can be used as a standard model to test the numerical calculation of LLG equation.

关键词： precession relaxation Landau-Lifshitz-Gilbert(LLG)equation uniaxial anisotropy analytical solutions

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Development of Mg-Al LDH and LDO as novel protective materials for deacidification of paper-based relics

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Chinese Chemical Letters 2024年第9期35卷 475-480页

作者： Sinong Wang Shanshan jin xue Yang Yanyan Huang Peng Liu Yi Tang Yuliang Yang Institute for Preservation and Conservation of Chinese Ancient Books Fudan University LibraryFudan UniversityShanghai 200433China Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsCollaborative Innovation Centre of Chemistry for Energy MaterialsFudan UniversityShanghai 200433China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China Key Laboratory of Pulp and Paper Science&Technology of Ministry of Education Qilu University of Technology(Shandong Academy of Sciences)Ji’nan 250353China

Acidification of paper-based relics is a common problem,leading to their degradation and eventual *** deacidification is highly dependent on a limited variety of alkaline materials,and the development of new materials that are safe,efficient and easy-to-prepare is highly demanded to ensure a high level of safety and effective protection of paper-based *** study proposes the introduction of layered double hydroxide(LDH)and its calcined product,mixed metal oxide(layered double oxide(LDO)),as innovative protective materials for the deacidification of paper with varying levels of *** results demonstrate that treatment with Mg-Al LDH/LDO can effectively modify the p H of acidic paper(e.g.,pH~4.0–6.4)to a neutral or weakly basic state,maintaining this desirable p H range even under long-term accelerated aging ***,LDH proves to be well-suited for the protection of slightly acidified paper(e.g.,pH>5.5),while LDO serves as an especially option for the deacidification of severely acidified paper(e.g.,pH≤5.5).During aqueous deacidification,due to the memory effect of the LDH-based materials,LDO is converted to rehydrated LDH,which creates a mild and appropriate alkaline retention in the paper,avoiding damage caused by strong alkalinity such as cellulose degradation and pigment fading during subsequent long-term natural preservation of the ***,Mg-Al LDH/LDO materials also exhibit flame-retardant and bacteriostatic *** opens up opportunities for the safe,efficient and multifunctional protection of acidified paper-based relics.

关键词： Layered double hydroxide Layered double oxide Structural memory effect Paper protection Deacidification

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Recent development of three-dimension printed graphene oxide and MXene-based energy storage devices

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Tungsten 2024年第1期6卷 196-211页

作者： Liang-Hao Yu Xin Tao Shang-Ru Feng jin-Tao Liu Lin-Lin Zhang Guang-zhen Zhao Guang Zhu Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Key Laboratory of Leather of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

The research for three-dimension(3D)printing carbon and carbide energy storage devices has attracted widespread exploration *** designable in structure and materials,graphene oxide(GO)and MXene accompanied with a direct ink writing exhibit a promising prospect for constructing high areal and volume energy density *** review not only summarizes the recent advances in 3D printing energy storage devices including printing methods,ink rheological properties,and different energy storage systems,but also discusses the printing methods related to energy *** addition,the binder or additive free of two-dimensional carbide materials is quite important for the present electrochemical energy storage devices,which also are presented.

关键词： 3D printing Two-dimensional materials Energy storage device Ink theological MXene

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An optimized high-throughput SARS-CoV-2 dual reporter trans-complementation system for antiviral screening in vitro and in vivo

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Virologica Sinica 2024年第3期39卷 447-458页

作者： Yingjian Li xue Tan Jikai Deng xuemei Liu Qianyun Liu zhen Zhang Xiaoya Huang Chao Shen Ke Xu Li Zhou Yu Chen State Key Laboratory of Virology RNA InstituteCollege of Life Sciences and Frontier Science Center for Immunology and MetabolismWuhan UniversityWuhan430072China Institute for Vaccine Research at Animal Bio-safety Level III Laboratory Wuhan University School of MedicineWuhan430071China

The severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)is still epidemic around the *** manipulation of SARS-CoV-2 is restricted to biosafety level 3 laboratories(BSL-3).In this study,we developed a SARS-CoV-2ΔN-GFP-HiBiT replicon delivery particles(RDPs)encoding a dual reporter gene,GFP-HiBiT,capable of producing both GFP signal and luciferase *** optimal selection of the reporter gene,GFP-HiBiT demonstrated superior stability and convenience for antiviral ***,we established a RDP infection mouse model by delivering the N gene into K18-hACE2 KI mouse through *** mouse model supports RDP replication and can be utilized for in vivo antiviral *** summary,the RDP system serves as a valuable tool for efficient antiviral screening and studying the gene function of ***,this system can be manipulated in BSL-2 laboratories,decreasing the threshold of experimental requirements.

关键词： SARS-CoV-2 RDP Antiviral evaluation Mouse model BSL-2

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Solid-state synthesis of mesoporous metals via mechanochemical coordination self-assembly

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Science China Chemistry 2024年

作者： Hailong Xiong Chunyu Qi Lantian xue Ling Zhang Hanyu Liu zhen-An Qiao State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China State Key Laboratory of Superhard Materials College of Physics Jilin University State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University

Mesoporous metals with large surface area, high pore volume, and uniform pore structure hold excellent advantages for various applications. However, the state-of-the-art synthesis methods are still limited to wet chemistry, which requires excessive solvents and a time-consuming drying process. Here, we report a facile and general mechanochemical coordination self-assembly strategy to prepare mesoporous metals(e.g., Rh, Ru, Ir, Pt, Pd, Ag, Co, and Ni) with remarkable porous properties by using metal chlorides and cationic polymer interplay. Compared with the wet chemistry process, this method proceeds without solvents and does not need complicated experimental conditions and long synthetic periods, which not only greatly reduces the consumption of cost and energy and environmental pollution, but also improves the synthesis efficiency and yield of target products. We believe the developed approach will provide a general pathway for the scalable preparation of advanced porous materials.

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