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Prediction model for austenite grains growth during reheating process in Ti micro-alloyed cast steel by coupling precipitates dissolution and coarsening behavior

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Journal of Iron and Steel Research International 2019年第2期26卷 162-172页

作者： Tao Liu Mu-jun Long Wen-jie he Deng-fu Chen Zhi-hua Dong xian-guang zhang Hua-mei Duan State Key Laboratory of Coal Mine Disaster Dynamics and Control College of Materials Science and EngineeringChongqing UniversityChongqing 400030China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400030China Applied Materials Physics.Department of Materials Science and Engineering KTH-Royal Institute of TechnologyStockholm 10044Sweden Institute for Materials Research Tohoku UniversitySendai 980-8577Japan

A combined model to predict austenite grains growth of titanium micro-alloyed as-cast steel during reheating process was *** model invoIves the behaviors of austenite grains growth in continuous heating process and isothermal soaking process,and the variation of boundary pinning efficiency caused by the dissolution and coarsening kinetics of sec on d-phase particles was also con sidered into the ***,the experimental verificatio ns were performed to examine the prediction power of the *** results revealed that the mean austenite grains size increased with the increase in reheating temperature and soaking time,and the coarsening temperature of austenite grains growth was 1423 K under the current titanium *** addition,the reliability of the predicted results in continuous heating process was validated by continuous heating ***,an optimal regression expression of austenite grains growth in isothermal soaking process was obtained based on the experimental *** compared results indicated that the combined model in conjunction with precipitates dissolution and coarsening kinetics had good reliability and accuracy to predict the austenite grains growth of titanium micro-alloyed casting steel during reheating process.

关键词： Austenite grains growth Reheating process Precipitate dissolution Precipitate coarsening Prediction model

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The Existence of Positive Solution for Singular Boundary Value Problems of First Order Differential Equation on Unbounded Domains

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 95-104页

作者： Xing-qiu zhang Jing-xian Sun Department of Mathematics Liaocheng University Liaocheng Shandong 252059 China Department of Mathematics Xuzhou Normal University Xuzhou Jiangsu 221116 China

By constructing a special cone and using cone compression and expansion fixed point theorem, this paper presents some existence results of positive solutions of singular boundary value problem on unbounded domains for a class of first order differential equation. As applications of the main results, two examples are given at the end of this paper.

关键词： Singular equation unbounded domain positive solution

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A Finite-Dimensional Completely Integrable System Associated with Boussinesq Hierarchy

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Communications in Theoretical Physics 2009年第12期52卷 1081-1086页

作者： CheN Lan-Xin zhang Jun-xian China University of Mining and Technology Beijing 100083 China Shijiazhuang University Shijiazhuang 050035 China

In this paper, a new completely integrable system related to the complex spectral problem -φ xx＋（i/4）wpx＋（i/4）（wp）x＋（1/4）vφ=iλφxand the constrained flows of the Boussinesq equations axe generated. According to the viewpoint of Hamiltonian mechanics, the Euler-Lagrange equations and the Legendre transformations, a reasonable Jacobi-Ostrogradsky coordinate system is obtained. Moreover, by means of the constrained conditions between the potentiaJ u, v and the eigenfunction φ, the involutive representations of the solutions for the Boussinesq equation hieraxchy axe given.

关键词： eigenvalue problem constraint flow symplectic manifold completely integrability involutive representation

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First-principles calculations of K-shell x-ray absorption spectra for warm dense ammonia

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Chinese Physics B 2021年第5期30卷 576-582页

作者： Zi Li Wei-Jie Li Cong Wang Dafang Li Wei Kang xian-Tu he Ping zhang Institute of Applied Physics and Computational Mathematics Beijing 100088China Center for Applied Physics and Technology Peking UniversityBeijing 100871China

The x-ray absorption spectroscopy is a powerful tool for the detection of thermodynamic conditions and atomic structures on warm dense ***,we perform first-principles molecular dynamics and x-ray absorption spectrum calculations for warm dense ammonia,which is one of the major constituents of Uranus and *** nitrogen K-shell x-ray absorption spectrum(XAS)is determined along the Hugoniot curve,and it is found that the XAS is a good indicator of the prevailing thermodynamic *** atomic structures at these conditions are *** indicate that the ammonia could dissociate to NH_(x)(x=0,1,or 2)fragments and form nitrogen clusters,and the ratios of these products change with varying *** contributions to the XAS from these products show quite different characteristics,inducing the significant change of XAS along the Hugoniot *** model simulations imply that the distribution of the peak position of atomic XAS is the dominant factor affecting the total XAS.

关键词： first-principles warm dense x-ray absorption spectrum ammonia

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Hybrid electromechanical properties of hetero-doped and homogeneously bonded dual-mode pressure sensor for indoor body area network node

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Science China(Information Sciences) 2024年第1期67卷 240-253页

作者： Junbin YU Shuai xian Jinbiao MU Min WANG Yin WANG Xiaojuan HOU Le zhang Jian he Jiliang MU Xiujian CHOU Science and Technology on Electronic Test and Measurement Laboratory North University of China Sichuan Aerospace Fenghuo Servo Control Technology Corporation

Pressure sensors are considerably important for continuous monitoring of human movement and the surrounding environment to construct a caregiving system for the elderly living *** challenge for pressure sensors that still remains is combining self-driven,comfort,and ***,an all-in-one conformal pressure sensor(ACPS) based on a homogeneous integrated triboelectric-piezoelectric hybrid sensor is *** ACPS has dual-mode sensing properties due to coupling triboelectrification and piezoelectric effect ensuring a stable response to various external ***-coated glass microspheres and polyacrylonitrile were uniformly filleted into the silicone rubber substrate using a hetero-doping method to create a stretchable electrode layer with flexible conformal characteristics and a piezoelectric layer with excellent piezoelectric properties,***,the triboelectric layer was fabricated using the same silicone rubber,allowing ACPS to be homogeneously bonded into an all-in-one structure with reliable *** allowed various functional layers to have outstanding interface characteristics and thus improve the electrical transmission *** developed ACPS had outstanding sensitivity(1.04 V/104Pa),high linearity(about 0.984),a wide measurement range(10–700 k Pa),and can accurately and continuously distinguish multiple ***,using a homemade signal processing circuit,ACPSs can be deployed in the human body and the room as indoor body area network *** successfully applied to the remote tracking of daily dynamic home life and the remote operation of small electrical equipment,these ACPSs can achieve real-time caregiving for the elderly living *** an application area desperately needed by society,this study envisions a caregiving system for the elderly living alone without violating personal privacy.

关键词： dual-mode pressure sensor homogeneous bonding all-in-one structure indoor body area network node elderly caregiving microsystem

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Notoginsenoside as an environmentally friendly shale inhibitor in water-based drilling fluid

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Petroleum Science 2022年第2期19卷 608-618页

作者： Jin-Sheng Sun Zong-Lun Wang Jing-Ping Liu Kai-he Lv Fan zhang Zi-Hua Shao Xiao-Dong Dong Zhi-Wen Dai xian-Fa zhang College of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPeople's Republic of China Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPeople's Republic of China

The demand for non-toxic and biodegradable shale inhibitors is growing in the drilling *** this paper,the effect of notoginsenoside(NS)as a new,environmentally friendly inhibitor of shale hydration is systematically studied for the first *** inhibition performance of NS was evaluated via inhibition evaluation tests,including mud ball immersion tests,linear expansion tests,shale rolling recovery tests,and compressive strength *** inhibition mechanism of NS was analyzed using Fourier transform infrared spectroscopy(FTIR),contact angle measurements,particle size distribution determination,thermogravimetric analysis(TGA),and scanning electron microscopy(SEM).The experimental results demonstrate that NS is able to adhere to the clay surface,forming a hydrophobic film that prevents the entry of water molecules and inhibiting the hydration dispersion of the *** of this,NS can maintain the original state of bentonite pellets in water,which can effectively reduce the swelling rate of bentonite,increase the recovery rate of shale drill cuttings,maintain the strength of the shale,and therefore maintain the stability of the borehole wall during *** addition,NS is non-toxic,degradable,and compatible with water-based drilling *** above advantages make NS a promising candidate for use as an environmentally friendly shale inhibitor.

关键词： Notoginsenoside Shale inhibition Environmentally friendly Water-based drilling fluid Inhibition mechanism

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Accumulated-state-error-based event-triggered sampling scheme and its application to H∞ control of sampled-data systems

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Science China(Information Sciences) 2024年第6期67卷 328-341页

作者： xian-Ming zhang Qing-Long HAN Bao-Lin zhang Xiaohua GE Dawei zhang School of Science Computingand Engineering TechnologiesSwinburne University of Technology College of Automation and Electronic Engineering Qingdao University of Science & Technology School of Mathematics Shandong University

This paper is concerned with event-triggered H∞control of sampled-data systems. Its novelties lie in three aspects:（i） A novel accumulated-state-error-based event-triggered scheme is introduced by comparing the integral of the state error from tk to t with the system state sampled at tk. This condition works well due to the fact that the so-called Zeno behaviour does not occur.（ii） A novel Lyapunov functional is constructed to establish a criterion to ensure some certain H∞performance of the closed-loop system. This Lyapunov functional is dependent on the integral of the state error involved in the event-triggered scheme.（iii） Under the event-triggered sampling scheme, suitable state-feedback controllers can be designed rather than be given a priori. Moreover, a self-triggered implementation of the proposed event-triggered sampling scheme is presented as well. Finally, a batch reactor model and an inverted pendulum system are given to demonstrate the effectiveness of the proposed method.

关键词： event-triggered sampling self-triggered implementation H ∞ control looped-functional

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Efficacy and Safety of Bufei Jiedu Granules in Treating Multidrug-Resistant Pulmonary Tuberculosis:A Multi-center,Double-Blinded and Randomized Controlled Trial

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Chinese Journal of Integrative Medicine 2024年第7期30卷 579-587页

作者： zhang Shao-yan QIU Lei zhang Shun-xian XIAO he-ping CHU Nai-hui zhang Xia zhang Hui-qiang ZheNG Pei-yong zhang Hui-yong LU Zhen-hui Institute of Respiratory Diseases Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai200032China Clinical Research Center Shanghai University of Traditional Chinese MedicineShanghai200032China Department of Tuberculosis Shanghai Pulmonary HospitalTongji UniversityShanghai200433China Department of Tuberculosis Beijing Chest HospitalCapital Medical UniversityBeijing101100China Department of Tuberculosis the Second Hospital of NanjingNanjing210003China Department of Tuberculosis the First Hospital Affiliated to Xinxiang Medical CollegeXinxiangHenan Province453100China

Objective: To assess the efficacy and safety of Bufei Jiedu(BFJD) Granules as adjuvant therapy for patients with multidrug-resistant pulmonary tuberculosis(MDR-PTB). Methods: A large-scale, multi-center, double-blinded, and randomized controlled trial was conducted in 18 sentinel hospitals in China from December 2012 to December 2016. A total of 312 MDR-PTB patients were randomly assigned to BFJD Granules or placebo groups(1:1) using a stratified randomization method, which both received the long-course chemotherapy regimen for 18 months(6 Am-Lfx-P-Z-Pto, 12 Lfx-P-Z-Pto). Meanwhile, patients in both groups also received BFJD Granules or placebo twice a day for a total of 18 months, respectively. The primary outcome was cure rate. The secondary outcomes included time to sputum-culture conversion, changes in lung cavities and quality of life(QoL) of patients. Adverse reactions were monitored during and after the trial. Results: A total of 216 cases completed the trial, 111 in the BFJD Granules group and 105 in the placebo group. BFJD Granules, as adjuvant treatment, increased the cure rate by 13.6% at the end of treatment, compared with the placebo(58.4% vs. 44.8%, P=0.02), and accelerated the median time to sputum-culture conversion(5 months vs. 11 months). The cavity closure rate of the BFJD Granules group(50.6%, 43/85) was higher than that of the placebo group(32.1%, 26/81;P=0.02) in patients who completed the treatment. At the end of the intensive treatment, according to the 36-item Short Form, the BFJD Granules significantly improved physical functioning, general health, and vitality of patients relative to the placebo group(all Phe death rates in the two groups were not significantly different;5.1%(8/156) in the BFJD Granules group and 2.6%(4/156) in the placebo group. Conclusions: Supplementing BFJD Granules with the long-course chemotherapy regimen significantly increased the cure rate and cavity closure rate, and rapidly improved QoL of pati

关键词： alternative medicine Chinese herbal formula Bufei Jiedu Granules multidrug-resistant tuberculosis long-course chemotherapy regimen randomized controlled trial

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Failure of hanging roofs in sublevel caving by shock collision and stress superposition

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第6期8卷 886-895页

作者： Zong-xian zhang Department of Arctic Technology University Center in Svalbard

Hanging roofs or high hang-ups.a common problem in sublevel caving mining,usually result in a large ore loss and undermine mining *** paper analyzed the formation of a hanging roof and showed that increased confining pressure and reduced free surface were its main *** order to break down a hanging roof,a new method based on shock wave collision and stress superposition was *** this method,two blastholes containing multi-primer at different positions are simultaneously initiated at *** doing this,a new free surface and a swell room can be *** these holes are fired,a long delay time is given to the next blasthole so that the fragments from the first twohole blasting have enough time to fall *** new method was applied to three hanging roofs in one production area,and all of them were successfully broken *** inspection indicated that almost no damage was caused in the nearby drifts/tunnels due to the new *** addition,the far field vibrations were found to be smaller than the maximum vibrations induced by some other blasts.

关键词： Shock wave collision Hanging roof Sublevel caving Rock fracture Hang-up Underground mining

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Transfer of the zp3a gene results in changes in egg adhesiveness and buoyancy in transgenic zebrafish

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Zoological Research 2023年第2期44卷 259-268页

作者： Yu-Qing Cao Yong-Xin Wang Yan Zhao Jia zhang xian he Ping Xie Jun Chen Yu-Hua Sun Institute of Hydrobiology Chinese Academy of SciencesWuhanHubei 430072China Innovation Academy for Seed Design Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and BiotechnologyInstitute of HydrobiologyChinese Academy of SciencesWuhanHubei 430072China

Reproductive strategies and spawning habits play key roles in the evolution of endemic East Asian ***,the molecular mechanisms underlying the regulation of spawning habits are not well *** recently identified zona pellucida(Zp) as the top differentially expressed protein between East Asian cyprinids that produce adhesive and semi-buoyant eggs,suggesting that Zp protein may play important roles in the regulation of egg *** this work,we generated transgenic zebrafish in which oocyte-specific expression of zp genes from rare minnow(Gobiocypris rarus),an East Asian cyprinid laying adhesive eggs,was driven by a zebrafish zp3.2 gene *** found that the transgenic eggs obtained partial adhesiveness and exhibited alteration in hydration and *** metabolism of vitellogenin(VTG) may contribute to enhanced hydration and/or *** work shows that expression of the exogenous zp3a gene from an adhesiveegg producing fish is sufficient to induce changes in both egg adhesiveness and buoyancy in zebrafish,emphasizing the important role of zp genes in the regulation of spawning *** results thus provide new insights into how endemic East Asian cyprinids may have adapted to the Yangtze river-lake system via changes in spawning habits.

关键词： Zona pellucida protein Adhesive Buoyancy Hydration Egg envelope

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