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Non-isothermal Kinetic Analysis on the Thermal Decomposition of the Phase 517 from Hydration Product of Magnesium Sulfide Cement

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Journal of Wuhan University of Technology(Materials Science) 2023年第2期38卷 374-380页

作者： CUI Baodong guan yan BI Wanli School of Materials and Metallurgy University of Science and TechnologyLiaoningAnshan110325China School of Materials Science and Engineering Shenyang Ligong UniversityShenyang110159China

In order to better understand the thermodynamic properties of magnesium oxysulfate(MOS)cement,pure reagent was analyzed to prepare magnesium sulfide cement,non-isothermal kinetics calculation of the main hydration products was also carried out,and the conversion process of magnesium sulfide cement 517 phase at different temperatures was *** of magnesium sulfide cement prepared was measured by XRD technique,and decomposed by a comprehensive thermal analyzer,and DSC curves of magnesium sulfide cement under different temperature rising rates were processed by Kinssinger method and Dolye-Ozawa *** to the TG-DSC curves of magnesium sulfide cement,the thermal decomposition reaction process can be divided into five stages under normal *** DSC curve was processed by Kinssinger method and Dolye-Ozawa method,and the kinetic analysis was carried out to calculate the 517 phase activation energy of magnesium sulfide *** three stages correspond to different activation ***,flame retardant mechanism and thermal decomposition mechanism of magnesium sulfide cement based materials are deduced.

关键词： magnesium sulfide cement comprehensive thermal analysis nonisothermal dynamics 517 phase

Algebraic Properties of Toeplitz and Small Hankel Operators on the Harmonic Bergman Space

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Acta Mathematica Sinica,English Series 2014年第8期30卷 1395-1406页

作者： Hong yan guan Yu Feng LU School of Mathematical Sciences Dalian University of Technology School of Mathematics and Systems Science Shenyang Normal University

In this paper,we discuss some algebraic properties of Toeplitz operators and small Hankel operators with radial and quasihomogeneous symbols on the harmonic Bergman space of the unit disk in the complex plane *** solve the product problem of quasihomogeneous Toeplitz operator and quasihomogeneous small Hankel ***,we characterize the commutativity of quasihomogeneous Toeplitz operator and quasihomogeneous small Hankel operator.

关键词： Toeplitz operator small Hankel operator quasihomogeneous symbols harmonic Bergman space Mellin transform

Deformation efficiency, homogeneity, and electrical resistivity of pure copper processed by constrained groove pressing

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Rare Metals 2014年第3期33卷 287-292页

作者： Zong-Shen Wang yan-Jin guan Ping Liang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University

Constrained groove pressing（CGP） is a new severe plastic deformation method suitable for producing ultra-fine grained sheet metals. In this work, the processing efficiency for a muti-pass CGP of pure copper was investigated. With a relatively small groove width of 2 mm and tight constraint, a sharp variation of mechanical properties with pass number is observed. Subgrains with the size of＊0.5 lm have distinct boundaries, which is the predominant feature in the microstructure after three passes. The evolution of deformation homogeneity characterized by micro-hardness distribution was examined in *** of optical micrographs and fracture surface morphology confirm the evolution rule. The relation between electrical resistivity and accumulative plastic strain was discussed. Crystalline defects, micro-cracks, and microstructure uniformity together determine the change of electrical resistivity of CGP copper.

关键词： Constrained groove pressing Processingefficiency Strain homogeneity Electrical resistivity

Comparative study of different membranes as separators for rechargeable lithium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2013年第6期20卷 598-603页

作者： Hong-yan guan Fang Lian yan Ren yan Wen Xiao-rong Pan Jia-lin Sun School of Materials Science and Engineering University of Science and Technology Beijing

Membranes of polypropylene （PP）, PP coated with nano-A1203, PP electrospun with polyvinylidene fluoride- hexafluoropropylene （PVdF-HFP）, and trilayer laminates of polypropylene-polyethylene-polypropylene （PP/PE/PP） were comparatively studied. Their physical properties were characterized by means of thermal shrinkage test, liquid electrolyte uptake, and field emission scanning electron microscopy （FESEM）. Results show that, for the different membranes as PP, PP coated with nanowA1203, PP electrospun with PVdF-HFP, and PP/PE/PP, the thermal shrinkages are 14%, 6%, 12.6%, and 13.3%, while the liquid electrolyte uptakes are 110%, 150%, 217%, and 129%, respectively. In addition, the effects on the performance of lithium-ion batteries （LiFePO4 and LiNil/3Col/3Mn1/302 as the cathode material） were investigated by AC impedance and galvanostatic charge/discharge test. It is found that PP coated with A1203 and PP electrospun with PVdF-HFP can effectively increase the wettability between the cathode material and liquid electrolyte, and therefore reduce the charge transfer resistance, which improves the capacity retention and battery performance.

关键词： lithium-ion batteries membranes separators thermal stability electrochemical properties

Fast quantum state transfer and entanglement for cavity-coupled many qubits via dark pathways

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Frontiers of physics 2022年第4期17卷 91-98页

作者： Yi-Xuan Wu Zi-yan guan Sai Li Zheng-Yuan Xue guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials and School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China guangdong–Hong Kong Joint Laboratory of Quantum Matter and Frontier Research Institute for PhysicsSouth China Normal UniversityGuangzhou 510006China

Quantum state transfer(QST)and entangled state generation(ESG)are important building blocks for modern quantum information *** achieve these tasks,convention wisdom is to consult the quantum adiabatic evolution,which is time-consuming,and thus is of low ***,using the shortcut to adiabaticity technique,we propose a general method to realize high-fidelity fast QST and ESG in a cavity-coupled many qubits system via its dark pathways,which can be further designed for high-fidelity quantum tasks with different optimization ***,with a proper dark pathway,QST and ESG between any two qubits can be achieved without decoupling the others,which simplifies experimental ***,ESG among all qubits can also be realized in a single *** addition,our scheme can be implemented in many quantum systems,and we illustrate its implementation on superconducting quantum ***,we propose a powerful strategy for selective quantum manipulation,which is promising in cavity coupled quantum systems and could find many convenient applications in quantum information processing.

关键词： entanglement generation quantum information processing cavity QED

Neuroprotective effect of chitosan nanoparticle gene delivery system grafted with acteoside (ACT) in Parkinson's disease models

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Journal of Materials Science & Technology 2020年第8期36卷 197-207页

作者： Yongyong Xue Na Wang Zhi Zeng Jinpeng Huang Zhiming Xiang yan-Qing guan MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou510631China School of Life Science South China Normal UniversityGuangzhou510631China South China Normal University-Panyu Central Hospital Joint Laboratory of Translational Medical Research Panyu Central HospitalGuangzhouChina Department of Radiology Guangzhou Panyu Center HospitalGuangzhou511400China

Developing new drugs to treat Parkinson's disease efficiently is challenging. Here we report that chitosan nanoparticles(APPDNs) could serve as novel candidates for the design of anti-PD drugs. In this study, we investigated the effects of chitosan poly ethyleneglycol-poly lactic acid(PEG-PLA) nanoparticles conjugated with nerve growth factor(NGF), acteoside(ACT) and plasmid DNA(p DNA) for PD therapy using in vitro and in vivo models. Using PD cell models, we demonstrated that APPDN had good neuroprotective effects. More significantly, experiments using mouse PD models demonstrated that APPDNs could ameliorate the behavioral disorders of sick mice. Immunohistochemical and western blot(WB) analyses demonstrated that APPDNs could significantly reverse dopaminergic(DA) neuron loss in the substantia nigra and striatum of sick mice. This study opens up a novel avenue to develop anti-PD drugs.

关键词： Parkinson's disease Chitosan nanoparticles Acteoside Gene therapy pDNA

Thermo-and pH-dual responsive inorganic-organic hybrid hydrogels with tunable luminescence

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Science China Chemistry 2018年第3期61卷 328-335页

作者： Jinlong Zhang Haibing Wei Junyan Tan Weihong Qiao yan guan Jie Zhang State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of Education College of Chemistry and Molecular Engineering Peking University School of Chemistry and Chemical Engineering Provincial Key Laboratory of Advanced Functional Materials and Devices Hefei University of Technology

A thermo-and pH-dual responsive luminescent hydrogel was successfully constructed by coupling dysprosium-containing polyoxometalates Na_9 DyW_(10) O_(36)(DyW_(10)) with the ABA triblock copolymer, where the B block is PEO and the A block is the thermosensitive poly(methoxydi(ethylene glycol) methacrylate-co-N,N-dimethylaminoethyl methacrylate). The complex hybrid underwent a sol-gel phase transition above the lower critical solution temperature(LCST) of the A block. DyW_(10) was electrostatically encapsulated into the hydrophobic domain of the A block with enhanced photoluminescence. When temperature cooled down, the luminescence could be restored. By addition of acids to protonate the A block, and emission of DyW_(10) was simultaneously enhanced. Sensitivity of poly(N,N-dimethy laminoethyl methacrylate)(PDMAEMA) to pH also enabled the emission of DyW_(10)/copolymer hydrogel to be reversibly switched by alternating acid/base treatments.

关键词： stimuli responsive block copolymer polyoxometalate hydrogel luminescence

Diagnosis of tuberculous uveitis by the macrogenome of intraocular fluid:A case report and review of the literature

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World Journal of Clinical Cases 2023年第14期11卷 3248-3255页

作者： yan-Kun Zhang yan guan Juan Zhao Li-Fei Wang Department of Ophthalmology Hebei Chest HospitalShijiazhuang 050047Hebei ProvinceChina Department of Respiratory Hebei Chest HospitalShijiazhuang 050047Hebei ProvinceChina Department of Ophthalmology Hebei Eye HospitalXingtai 050010Hebei ProvinceChina

BACKGROUND Tuberculous uveitis caused by tuberculosis infection factors is common,but tuberculous uveitis caused by Mycobacterium tuberculosis found in the intraocular fluid is *** report describes the use of intraocular fluid in the diagnosis of tuberculous uveitis in a patient and reviews the relevant *** SUMMARY A 24-year-old woman who was 31-wk pregnant visited Hebei Chest Hospital due to intermittent chest pain,fever,and decreased vision for 3 *** hydrothorax test suggested“tuberculous pleurisy”,and yellow effusion was extracted from the chest tube twice resulting in a total volume of approximately 800 *** patient chose to continue the pregnancy without treatment,and was hospitalized again due to high *** 2 mo of anti-tuberculosis treatment,a healthy boy was delivered by cesarean *** uveitis was diagnosed using tuberculosis Xpert,and intraocular infection was detected by second-generation gene *** systemic treatment,the patient gradually improved,and the corrected visual acuity of the left eye gradually increased from 0.08 to *** The etiology of uveitis is complex,and it is necessary to assess the patient’s general condition and apply molecular biology methods to determine the pathogenesis and guide precise treatment,to improve clinicians’awareness and standardize treatment of the disease.

关键词： Tuberculous uveitis Metagenomic next-generation sequencing Xpert Case

Pain management in patients with hepatocellular carcinoma after transcatheter arterial chemoembolisation: A retrospective study

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World Journal of Gastrointestinal Surgery 2023年第3期15卷 374-386页

作者： yan guan Ye Tian Ya-Wei Fan Hepatic Surgery Center Department of SurgeryTongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina

BACKGROUND Pain after transcatheter arterial chemoembolisation(TACE)can seriously affect the prognosis of patients and the insertion of additional medical *** To develop an early warning model for predicting pain after TACE to enable the implementation of preventive analgesic *** We retrospectively collected the clinical data of 857 patients(from January 2016 to January 2020)and prospectively enrolled 368 patients(from February 2020 to October 2022;as verification cohort)with hepatocellular carcinoma(HCC)who received TACE in the Hepatic Surgery Center of Tongji *** predictive models were established using machine learning algorithms,namely,random forest model(RFM),support vector machine model,artificial neural network model,naive Bayes model and decision tree *** efficacy of these models in predicting postoperative pain was evaluated through receiver operating characteristic curve analysis,decision curve analysis and clinical impact curve *** A total of 24 candidate variables were included in the predictive models using the iterative ***,preoperative pain,number of embolised tumours,distance from the liver capsule,dosage of iodised oil and preoperative prothrombin activity were closely associated with postoperative *** accuracy of the predictive model was compared between the training[area under the curve(AUC)=0.798;95%confidence interval(CI):0.745-0.851]and verification(AUC=0.871;95%CI:0.818-0.924)cohorts,with RFM having the best predictive efficiency(training cohort:AUC=0.869,95%CI:0.816-0.922;internal verification cohort:AUC=0.871;95%CI:0.818-0.924).CONCLUSION The five predictive models based on advanced machine learning algorithms,especially RFM,can accurately predict the risk of pain after TACE in patients with *** can be used to assess the risk of pain for facilitating preventive treatment and improving the prognosis.

关键词： Hepatocellular carcinoma Transcatheter arterial chemoembolization Pain Machine learning algorithm Prediction