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Dynamics and Thermodynamics of Porous HMX-like Material Under Shock

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Communications in Theoretical Physics 2009年第11期52卷 901-908页

作者： XU Ai-Guo ZHANG Guang-Cai ZHANG Ping PAN xiao-fei zhu Jian-Shi National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P.O.Box 8009-26 Beijing 100088 China

Strong shock may induce complex processes in porous materials. We use the newly developed materialpoint-method to simulate such processes in an HMX-like material. To pick out relevant information, morphological characterization is used to treat with the temperature map. Via the Minkowski funetional analysis the dynamics and thermodynamics of the shock wave reaction on porous HMX-like material are studied. The geometrical and topological properties of the ＂hot-spots＂ are revealed. Numerical results indicate that, shocks in porous materials are not simple jump states as classically viewed, but rather are a complex sequence of compressions and rarefactions. They cover a broad spectrum of states. We can use coarse-grained description to the wave series. A threshold value of temperature presents a Turing pattern dynamical procedure. A higher porosity is generally preferred when the energetic material needs a higher temperature for initiation. The technique of data analysis can be used to other physical quantities, for example, density, particle velocity, some specific stress, etc. From a series of studies along the line, one may get a large quantity of information for desiring the fabrication of material and choosing shock strength according to what needed is scattered or connected ＂hot-spots＂. PACS numbers： ***, 05 Key words： porous material 70.-a, 05.40.-a, *** shock wave, Minkowski functionals

关键词： porous material shock wave Minkowski functionals

Microstructure Evolution and Tensile Properties of the Alx(CoCrNi)100-x Medium-Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2023年第12期36卷 2045-2057页

作者： Ji-Peng Zou Xue-Mei Luo Bin Zhang Guo-Dong Liu Hong-Lei Chen xiao-fei zhu Wen-Ke Yang Guang-Ping Zhang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

A series of Alx(CoCrNi)100-x(x=0-21 at.%)medium-entropy alloys(MEAs)were designed and prepared to investigate the effects of Al addition on the microstructures and tensile *** results reveal that the lattice structure changes from the initial single FCC structure(x<10 at.%),to the FCC and disordered BCC structures(x=10 and 11 at.%),then to the FCC and BCC/B2 structures(11

关键词： Medium-entropy alloys Microstructures Tensile properties Strengthening mechanisms

Electroanalytical method for determination of shikonin based on the enhancement effect of cyclodextrin functionalized carbon nanotubes

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Chinese Chemical Letters 2015年第5期26卷 613-618页

作者： Yan-Sha Gao Li-Ping Wu Kai-Xin Zhang Jing-Kun Xu Li-Min Lu xiao-fei zhu Yao Wu Jiangxi Key Labrotory of Organic Chemistry Jiangxi Science and Technology Normal University College of Science Jiangxi Agricultural University

A simple and sensitive electroanalytical method for determination of shikonin, a widely used antitumoral agent, using β-cyclodextrin-functionalized multiwalled carbon nanotubes composite modified glassy carbon electrodes （MWCNTs/β-CD/GCE） was presented. CDs are water-soluble and environmentally friendly and can improve the dispersibility of MWCNTs/βCD functional materials, which was confirmed by SEM. The electrochemical behaviors of shikonin on different electrodes were investigated by cyclic voltammetry （CV） and differential pulse voltammograms （DPVs）. The results demonstrated that the redox peak currents of shikonin obtained at MWCNTs/fl-CD/GCE were much higher than those at the βCD/GCE and MWCNTs/GCE, which can be attributed to the combination of the excellent electrocatalytic properties of MWCNTs and the molecular recognition ability of βCD. At MWCNTs/ βCD/GCE, the response current exhibits a linear range from 5.0 nmol/L to 10.0 μmol/L with a detection limit of 1.0nmol/L （S/N=3）. As a practical application, the proposed method was applied to quantitatively determine shikoninin urine samples with satisfying results.

关键词： Shikonin β-Cyclodextrin Multiwalied carbon nanotubes Modified electrode Electrochemical detection

Synthesis and Characterization of D-/L-methionine Grafted PEDOTs for Selective Recognition of 3,4-Dihydroxyphenylalanine Enantiomers

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Chinese Journal of Polymer Science 2016年第5期34卷 563-577页

作者： li-qi dong du-fen hu 段学民 zhi-peng wang kai-xin zhang xiao-fei zhu hui sun you-shan zhang 徐景坤 School of Pharmacy Jiangxi Science & Technology-Normal University Nanchang 330013 China

Two pairs of amino-acid functionalized poly（3,4-ethylenedioxythiophene）（PEDOT） derivatives, namely, poly（N-（tert-butoxycarbonyl）-L-methionyl（3,4-ethylenedioxythiophene-2＇-yl）methylamide）（L-PEDOT-Boc-Met） and poly（N-（tertbutoxycarbonyl）-D-methionyl（3,4-ethylenedioxythiophene-2＇-yl）methylamide）（D-PEDOT-Boc-Met）; poly（L-methionyl（3,4-ethylenedioxythiophene-2＇-yl）methylamide）（L-PEDOT-Met） and poly（D-methionyl（3,4-ethylenedioxythiophene-2＇-yl）methylamide）（D-PEDOT-Met） were synthesized via chemical oxidative polymerization of corresponding monomers. The structural characterization, spectroscopic properties and thermal stability of these monomers and polymers were systematically explored by FTIR spectra, Raman spectra, XRD spectra, UV-Vis spectra and thermogravimetric analysis. As chiral electrode materials, these polymers were employed to successfully recognize 3,4-dihydroxyphenylalanine（DOPA） enantiomers by cyclic voltammetry（CV） in sulphuric acid solution. The measurement results reveal that the tendency was hetero-chiral interaction between L-PEDOT-Met/PVA/GCE and D-DOPA, D-PEDOT-Met/PVA/GCE and L-DOPA, respectively. Also, the mechanism of chiral discrimination was discussed. All the results implied that the combination of electrochemical molecular recognition technology and chiral PEDOT materials can be a promising approach for chiral recognition and may open new opportunities for facile, biocompatible, sensitive and robust chiral assays in biochemical applications.

关键词： PEDOT chiral polymerization methionine systematically voltammetry facile Recognition discrimination recognize

Prevalence of Enterococcus faecalis in saliva and filled root canals of teeth associated with apical periodontitis

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International Journal of Oral Science 2012年第1期4卷 19-23页

作者： Qian-Qian Wang Cheng-fei Zhang Chun-Hung Chu xiao-fei zhu Special Dental Department School and Hospital of Stomatology Peking University Beijing China Faculty of Dentistry The University of Hong Kong Hong Kong SARChina

To investigate the prevalence of Enterococcus faecalis in saliva and filled root canals of patients requiring endodontic retreatment for apical *** with apical periodontitis who were referred for endodontic retreatment were *** type and quality of the restoration,symptoms,quality of obturation were *** retreatment,an oral rinse sample and root canal sample were cultured using brain-heart infusion agar and bile esculinazide agar to select for *** 16S rRNA technique was used to identify ***.A total of 32 women and 22 men（mean age：38 years;s.d.：11 years） and 58 teeth were *** prevalence of *** was 19% in the saliva and 38% in the root *** odds that root canals harbored *** were increased if the saliva habored this bacterium（odds ratio59.7;95% confidence interval51.8-51.6;P,0.05）.Teeth with unsatisfactory root obturation had more cultivable bacterial species in root canals than teeth with satisfactory root obturation（P,0.05）.*** is more common in root canals of teeth with apical periodontitis than in *** prevalence of *** in root canals is associated with the presence of *** in saliva.

关键词： apical periodontitis endodontic treatment Enterococcus faecalis saliva 16S rRNA

Literature Views on Second Language Acquisition The Ways of Incorporating Interaction and Participation

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Sino-US English Teaching 2015年第1期12卷 26-30页

作者： XU xiao- fei zhu Ping Nanhu College Jiaxing University Jiaxing China

Most current theories of second language acquisition and current views on methods and approaches to teaching English as a second language place a high value on student participation and interaction in the language classroom. This interaction may be between teacher and student and/or student and student. Despite this, in many English classrooms around the world, students have very few opportunities to interact in the second language. In this paper, using the literature on second language acquisition research and methodology to prepare a case which highlights why teachers and course designers should find ways to incorporate second language interaction and student participation in their language classes despite the practical difficulties they may face.

关键词： second language acquisition participation interaction

Electrosynthesis and Characterization of Aminomethyl Functionalized PEDOT with Electrochromic Property

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Chinese Journal of Polymer Science 2015年第11期33卷 1527-1537页

作者： Hui Sun Bao-yang Lu Du-fen Hu 段学民徐景坤 Shi-jie Zhen Kai-xin Zhang xiao-fei zhu Li-qi Dong Dai-ze Mo School of Pharmacy Jiangxi Science & Technology Normal University

We herein report the electrosynthesis of an aminomethyl functionalized poly（3,4-ethylenedioxythiophene）（PEDOT） derivative, poly（2＇-aminomethyl-3,4-ethylenedioxythiophene）（PEDOT-Me NH2）, in CH2Cl2-Bu4NPF6（0.1 mol·L^-1） system containing 2% boron trifluoride diethyl etherate（BFEE）. The electrochemical behavior, structure characterization, thermal properties and surface morphology of this novel polymer were systematically investigated by cyclic voltammetry（CV）, Fourier-transform infrared spectroscopy（FTIR）, thermogravimetry（TG） and scanning electron microscopy（SEM）, respectively. Electrochemistry results demonstrated that PEDOT-Me NH2 film displayed good redox properties and high electrochemical stability. Besides, PEDOT-Me NH2 films exhibited the electrochromic nature with obvious color changing from purple in the reduced form to blue upon oxidation. By further investigation, kinetic studies revealed that PEDOT-Me NH2 film had decent contrast ratio（41.8%）, favorable coloration efficiency（152.1 cm^2·C^-1）, low switching voltages and moderate response time（2.4 s）. Satisfactory results implied that the obtained PEDOT-Me NH2 film is a promising optoelectronic material and holds promise for electrochromic devices and display applications.

关键词： Conducting polymers Poly(3 4-ethylenedioxythiophene) derivatives Aminomethyl group Electrochemical polymerization Electrochromics

Work Capacity of the Bladder During Voiding： A Novel Method to Evaluate Bladder Contractile Function and Bladder Outlet Obstruction

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Chinese Medical Journal 2015年第24期128卷 3329-3334页

作者： Ning Liu Li-Bo Man Feng He Guang-Lin Huang Ning Zhou xiao-fei zhu Department of Urology Beijing Jishuitan Hospital Beijing 100035 China

Background： Work in voiding （WIV） of the bladder may be used to evaluate bladder status throughout urination rather than at a single time point. Few studies, however, have assessed WIV owing to the complexity of its calculations. We have developed a method of calculating work capacity of the bladder while voiding and analyzed the associations of bladder work parameters with bladder contractile function and bladder outlet obstruction （BOO）. Methods： The study retrospectively evaluated 160 men and 23 women, aged 〉40 years and with a detrusor pressure at maximal flow rate （PdetQmax） of ≥40 cmH2O in men, who underwent urodynamic testing. The bladder power integration method was used to calculate WIV; WIV per second （WIV/t） and WIV per liter of urine voided （WIV/v） were also calculated. In men, the relationships between these work capacity parameters and PdetQmax and Abrams-Griffiths （AG） number were determined using linear-by-linear association tests, and relationships between work capacity parameters and BOO grade were investigated using Spearman＇s association test. Results： The mean WIV was 1.15 ± 0.78 J and 1.30 ± 0.88 J, mean WIV/t was 22.95 ± 14,45 mW and 23.78 ± 17.02 mW, and mean WIV/v was 5.59 ± 2.32 J/L and 2.83 ± 1.87 J/L in men and women, respectively. In men, WIV/v showed significant positive associations with PdetQmax （r = 0.845, P = 0.000）, AG number （r = 0.814, P = 0.000）, and Schafer class （r = 0.726, P = 0.000）. Conversely, WIV and WIV/t showed no associations with PdetQmax or AG number. In patients with BOO （Schafer class 〉 II）, WIV/v correlated positively with increasing BOO grade. Conclusions： WIV can be calculated from simple urodynamic parameters using the bladder power integration method. WIV/v may be a marker of BOO grade, and the bladder contractile function can be evaluated by WIV and WIV/t.

关键词： Bladder Function Bladder Outlet Obstruction Urodynamics Work in Voiding

New Staging Model for Radiation-based Hepatocellular Carcinoma Treatment:A National Multicenter Study

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Journal of Clinical and Translational Hepatology 2023年第2期11卷 341-349页

作者： Ting-Shi Su Shi-Xiong Liang Li-Qing Li Qiu-Hua Liu Xue-Zhang Duan Jing Sun Hai Zeng Hai-Sheng zhu Jian-Xu Li xiao-fei zhu Hong-Qing zhuang Ping Liang Yong Huang Department of Radiation Oncology Guangxi Medical University Cancer HospitalNanningGuangxiChina Department of Radiation Oncology Ruikang HospitalNanningGuangxiChina Radiation Oncology Department The Fifth Medical Center of PLA General HospitalBeijingChina Department of Oncology First Affiliated Hospital of Yangtze UniversityJingzhouHubeiChina Department of Oncology Sixth Affiliated Hospital of Guangxi Medical UniversityFirst People’s Hospital of YulinYulinGuangxiChina Department of Radiation Oncology Changhai Hospital Affiliated to Navy Medical UniversityShanghaiChina Department of Radiation Oncology Peking University Third HospitalBeijingChina Department of Radiation Oncology Nanning First People’s HospitalNanningGuangxiChina

Background and Aims:The study aimed to create a new staging model for radiotherapy-based treatment for prognostic hepatocellular carcinoma(HCC)***:The training cohort comprised 658 patients receiving stereotactic body radiotherapy and external validation cohort comprised 533 patients receiving three-dimensional conformal radiotherapy and intensity-modulated *** established a modified staging system as follows:stage I,solitary nodule without macrovascular invasion,or 2–3 nodules no more than 3.0 cm apart,and performance status(PS)0–2(Ia:ALBI-1 grade;Ib:ALBI-2 or 3 grade);stage II:2–3 nodules with any one nodule more than 3.0-cm apart,or≥4 nodules,and performance status 0–2(IIa:ALBI-1 grade;IIb:ALBI-2 grade);stage III:macrovascular invasion,regional lymph node metastasis or distant metastasis,and performance status 0–2(IIIa:ALBI-1 grade;IIIb:ALBI-2 grade);stage IV:performance status 3–4,or performance status 0–2 with ALBI-3 *** analyzed longterm overall survival based on different ***:The staging model showed an excellent ability to discriminate patients according to four stages and seven substages with notably different curves in the training and validation *** median survival decreased from stages I to IV with 63.0 months in stage I(not reached in Ia,and 53.0 months in Ib),24.0 months in stage II(28.0 months in IIa,and 22.0 months in IIb),11.0 months in stage III(18.0 months in IIIa,and 9.0 months in IIIb),and less than 9.0 months in stage IV in the training ***:The modified staging model may provide an alternative for clinical radiation oncologists.

关键词： Hepatocellular carcinoma Radiotherapy Stereotactic body radiotherapy Staging system Overall survival