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Chinese Chemical Letters 2022年第5期33卷 2579-2584页

作者： Zihao chen ben Chong Nathan Wells Guidong Yang Lianzhou Wang XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology the University of QueenslandQLD 4072Australia

Adjusting the electronic structure of graphitic carbon nitride(g-C_(3)N_(4))photocatalyst throughπ-πconju-gation is an effective method to achieve efficient photogenerated carrier *** key challenge ofπ-πconjugation control is to tune the degree of such conjugation without destroying the g-C_(3)N_(4)*** we report a conceptual design that achieves a coplanar heterojunction by enhancing theπ-πconjugation via the doping of crystalline g-C_(3)N_(4)using a conjugated double bond ring molecule,1,3,5-benzenetriol,during calcination *** selection of the dopant enables the facile creation of a unique coplanar heterojunction which not only retains the pristine network structure of g-C_(3)N_(4),but remarkably promotes separation and transfer of photogenerated carriers through the enhancedπ-conjugated endogenous electric *** a result,the new g-C_(3)N_(4)photocatalyst efficiently photocatalyti-cally produces hydrogen from water under visible light irradiation with a high H 2 production rate up to 94.94μmol/h,and a notable external quantum efficiency of 16.4%at 420 nm.

关键词： g-C_(3)N_(4) Charge separation Coplanar heterojunction Enhancedπ-πconjugation Photocatalysis

Novel ternary Ag/CeVO_4/g-C_3N_4 nanocomposite as a highly efficient visible-light-driven photocatalyst

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Journal of Advanced Ceramics 2018年第1期7卷 50-57页

作者： J.REN Y.Z.WU J.m.PAN X.H.YAN m.chen J.J.WANG D.F.WANG C.ZHOU Q.WANG X.N.chenG School of materials Science and Engineering Jiangsu University Institute for Advanced materials Jiangsu University Institute of Green materials and metallurgy Jiangsu University

The CeVO_4/graphitic C_3N_4 composites have exhibited much enhanced photocatalytic property for degrading methylene blue(mB) pollutant under visible light irradiation compared with single-phase g-C_3N_4 or CeVO_4. The composite S5 obtained from an optimized mass ratio(5%) of CeVO_4 to dicyanamide(DCDA) exhibits the highest photocatalytic activity. Here, ternary Ag/CeVO_4/g-C_3N_4 composites denoted as X%Ag/S5 were prepared by an ultrasonic precipitation method to improve the photocatalytic property of S5. The TEm images show that CeVO_4 and Ag nanoparticles are well distributed on the layered g-C_3N_4, which agree well with the XRD results. The UV spectra show that the 7%Ag/S5 sample has the widest absorption range and the enhanced absorption intensity under visible light irradiation. The corresponding band gap of 7%Ag/S5(2.5 eV) is much lower than that of S5(2.65 eV). The corresponding k value of 7%Ag/S5 is much higher than those of g-C_3N_4 and CeVO_4. The degradation experiments for mB solution suggest that the 7%Ag/S5 sample has the optimal photocatalytic performance, which can degrade mB solution completely within 120 min. The enhanced photocatalytic property of the composites is ascribed to not only the effect of heterojunction structure, but also the surface plasma resonance effect of Ag nanoparticles.

关键词： g-C3N4 CeVO4 Ag nanocomposites photocatalytic performance

Substrate Temperature-Dependent Physical Properties of Thermally Evaporated Sn4Sb6S13 Thin Films

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Acta metallurgica Sinica(English Letters) 2016年第1期29卷 79-88页

作者： A. Harizi m. ben Rabeh m. Kanzari Laboratoire de Photovoltaique et materiaux Semiconducteurs departement genie industriel ENIT-Universite Tunis E1 Manar BP 37 Le belvedere 1002 Tunis Tunisie Institut Preparatoire aux Etudes d'Ingenieurs de Tunis Universite de Tunisie Montfleury Tunisia

In this work, the homogenous thin films of sulfosalt Sn4Sb6S13 were successfully synthesized by the thermal evaporation technique onto coming 7059 glass substrates heated at various temperatures in the range of 30--200 ℃. The surface morphology and structural characteristics of Sn4Sb6S13 films were analyzed by atomic force microscopy, X-ray diffraction, and energy-dispersive X-ray, respectively. The X-ray diffraction analysis revealed that Sn4Sb6S13 thin films crystallized in monoclinic structure according to a preferential direction （6 11）. An improvement in the structural properties by increasing the substrate temperature was observed. The values of some important parameters such as absorption coefficient （x）, band gap （Eg）, refractive index （n）, extinction coefficient （k）, and dielectric constant （Eg） of thin film were determined. The absorption coefficient was larger than 105 cm-l in the visible range. The electron transition of Sn4Sb6S13 films was direct allowed with the values that decreased （2-1.69 eV） by increasing substrate temperature from 30 to 200 ℃,The dispersion data obeyed the single oscillator relation of the Wemple-DiDomenico model and Cauchy model. The electrical free carrier susceptibility and the carrier concentration of the effective mass ratio were estimated according to the model of Spitzer and Fan.

关键词： Thin film Thermal evaporation technique X-ray diffraction Optical parameters

Correlation of the anisotropic hardening behavior and texture features of cold rolled Zr-4 sheet under uniaxial tension

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Journal of materials Science & Technology 2022年第24期119卷 111-122页

作者： Huan Liu Siying Deng Shuaifeng chen Hongwu Song Shihong Zhang ben Wang 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 11016China State Nuclear Bao Ti Zirconium Industry Company Baoji 721013China

The strongly anisotropic mechanical behaviors commonly observed in Zr-4 sheets typically lead to inferior *** this study,the mechanical behavior and texture evolution of a cold-rolled Zr-4 sheet under uniaxial tension in various directions were systematically investigated,and the results showed both anisotropic yielding and hardening behavior in the Zr-4 *** microstructure and texture features revealed by electron backscattered diffraction(EBSD)method indicate that this anisotropic mechanical behavior is closely related to the initial texture and its evolution during plastic *** conjunction with experimental observations,a visco-plastic self-consistent(VPSC)model was employed to quantitatively analyze the relationship between the mechanical anisotropy and the texture features and activation of deformation *** was found that the yield anisotropy is affected by the distinct activity of prismaticslip,while the different activities of basalslip and extension twinning(ETW)result in anisotropic *** distinct activation of deformation modes is mainly caused by differences in the evolution of the Schmid factor(SF)and critical resolved shear stress(CRSS)with increasing ***,the results prove that the limited twinning activation with a fraction of less than 3%plays a non-negligible role in the hardening behavior during tension along the transverse *** latent hardening effect caused by the interaction between prismatic slip and tensile twinning is considered to successfully capture the anisotropic hardening behavior of the Zr-4 *** implementation and insights from the predictions are presented and discussed in this work.

关键词： Zr-4 sheet Anisotropic hardening Texture evolution Deformation modes Twinning

Bone marrow-derived mesenchymal stem cell transplantation attenuates overexpression of inflammatory mediators in rat brain after cardiopulmonary resuscitation

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Neural Regeneration Research 2020年第2期15卷 324-331页

作者： Qing-ming Lin Xia-Hong Tang Shi-Rong Lin ben-Dun chen Feng chen Institute of Fujian Emergency medicine Clinical College of Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Emergency Fujian Provincial HospitalFujian Provincial Emergency CenterFuzhouFujian ProvinceChina

Emerging evidence suggests that bone marrow-derived mesenchymal stem cell transplantation improves neurological function after cardiac arrest and cardiopulmonary resuscitation;however, the precise mechanisms remain unclear. This study aimed to investigate the effect of bone marrow-derived mesenchymal stem cell treatment on expression profiles of multiple cytokines in the brain after cardiac arrest and cardiopulmonary resuscitation. Cardiac arrest was induced in rats by asphyxia and cardiopulmonary resuscitation was initiated 6 minutes after cardiac arrest. One hour after successful cardiopulmonary resuscitation, rats were injected with either phosphate-buffered saline(control) or 1 × 10~6 bone marrow-derived mesenchymal stem cells via the tail vein. Serum S100 B levels were measured by enzyme-linked immunosorbent assay and neurological deficit scores were evaluated to assess brain damage at 3 days after cardiopulmonary resuscitation. Serum S100 B levels were remarkably decreased and neurological deficit scores were obviously improved in the mesenchymal stem cell group compared with the phosphate-buffered saline group. Brains were isolated from the rats and expression levels of 90 proteins were determined using a RayBio Rat Antibody Array, to investigate the cytokine profiles. Brain levels of the inflammatory mediators tumor necrosis factor-α, interferon-γ, macrophage inflammatory protein-1α, macrophage inflammatory protein-2, macrophage inflammatory protein-3α, macrophage-derived chemokine, and matrix metalloproteinase-2 were decreased ≥ 1.5-fold, while levels of the anti-inflammatory factor interleukin-10 were increased ≥ 1.5-fold in the mesenchymal stem cell group compared with the control group. Donor mesenchymal stem cells were detected by immunofluorescence to determine their distribution in the damaged brain, and were primarily observed in the cerebral cortex. These results indicate that bone marrow-derived mesenchymal stem cell transplantation attenuates brai

关键词： antibody array asphyxia brain damage cardiac arrest cardiopulmonary resuscitation global cerebral ischemia inflammatory mediator mesenchymal stem cell neurological deficit score S100B

Application of immobilized psychrotrophs in ICCBR to treat domestic wastewater and its microbiological investigation

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Chinese Science Bulletin 2009年第9期54卷 1599-1606页

作者： ben Yue chen ZhongLin XU ZhenZhen JIANG AnXi State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China

To guarantee the efficiency of biotreatment of domestic wastewater in chilly season, six high efficient cold-adapted microorganisms were isolated, and identified as Zoogloea, Aeromonas, Flarobacterium, micrococcus, Bacillus, Pseudomonas. These cold-adapted microorganisms with 63.67% Chemical Oxygen Demand (COD) removal efficiency higher than that of mesophiles at low temperature were immobilized on soft polyurethane foams and applied to internal circulation compound bioreactor (ICCBR) to treat domestic wastewater. In an experiment period of 12 months, the treatment efficiency, ecological factors, sludge physicochemical properties, and microbiology were studied. Results showed that the average COD removal efficiency in the ICCBR was 85.79% between 4℃ and 10℃ in winter, and 86.66% in the whole year, and COD of systemic effluent was below 60 mg·L-1 which could achieve the first-degree B discharge standard of pollutants in China for municipal wastewater treatment plant. The reduction in microfauna and biomass on carriers could be associated with the seasonal temperature transients, the concentrations of protozoa and metazoan decreased from 110000±30000 microorgan-isms/mL sludge in summer to 35000±20000 microorganisms/mL sludge in winter, and biomass on car-riers increased in the beginning and slightly reduced in the end.

关键词：微生物调查生活污水 COD去除率污染物排放标准固定化聚氨酯泡沫塑料复合生物反应器城市污水处理厂

Dental management of a patient with moebius syndrome:A case report

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World Journal of Clinical Cases 2021年第24期9卷 7269-7278页

作者： ben chen Ling-Xia Li Li-Li Zhou Department of Oral medicine The Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310009Zhejiang ProvinceChina Department of Generality Hospital of StomatologyZhejiang Chinese Medical UniversityHangzhou 310000Zhejiang ProvinceChina

BACKGROUND moebius syndrome(mBS)is a nonprogressive and rare congenital neuromuscular disorder involving the facial nerve and abductor nerve;it mainly manifests as facial paralysis and eye strabismus paralytic *** in the oral cavity are also compromised,characterized by microstomia,micrognathia,tongue malformation,cleft lip,high arched palate or cleft palate,bifid uvula,and dental ***,dentistry plays a fundamental and crucial role in caring for these ***,there is limited available data on mBS treatment,particularly regarding dental *** SUmmARY This case report presents dental treatment of a 21-year-old man with mBS and discusses crucial interactions among oral complications of *** this case,the patient was clinically characterized by congenital neuromuscular disorder,occlusal disorders,and tooth and gum *** is noteworthy that the patient presented early eruption of deciduous teeth 2 mo after birth,which has not been reported in other mBS cases and suggests a potentially new clinical manifestation of this *** is important to note that mBS cannot be cured,and oral manifestations of this syndrome can be managed by a multidisciplinary health care team that helps the patient maintain oral hygiene and dental *** a series of oral treatments,no obvious poor oral hygiene,swollen gums,or abnormal imaging results were observed after 2 years of *** This case addressed the oral clinical manifestations of mBS and difficulties experienced during dental management,and suggested early tooth eruption as a potentially new clinical manifestation of this *** of the loopmediated association among oral complications of this syndrome is essential to perfecting treatments.

关键词： Dental treatment moebius syndrome Oral complications Oral anomalies Early tooth eruption Case report

Wintertime Cyclone Activity and Its Relation to Precipitation over China

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Atmospheric and Oceanic Science Letters 2013年第5期6卷 387-393页

作者： chen Lei TAN ben-Kui Nils Gunnar KVAmSTΦ Ola m. JOHANNESSEN Department of Atmospheric and Oceanic Sciences School of Physics Peking University Geophysical Institute University of Bergen and the Bjerknes Centre for Climate Research Nansen Environmental and Remote Sensing Center Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Nansen Scientific Society

The authors examined the variability in wintertime cyclone activity and storm tracks and their relation to precipitation over China for the period 1951-2006 using the observational *** apparent modes of variability were assumed for the cyclone activity and storm *** first mode describes the oscillation in the strength of the storm tracks in East Asia,which significantly increased since the mid-1980s,whereas the second mode describes a seesaw oscillation in the storm track strength between the Central-Southeast China and northem East *** storm tracks over the Central-Southeast China have increased since the late *** possible causes for the variation of the cyclone activity and storm tracks are also *** is shown that wintertime precipitation,which has increased since the mid-1980s,concentrates in Central-Southeast *** enhancement may be caused by the first mode of variability of storm tracks,whereas the interannual variability of precipitation may be linked to the second mode of the storm track variability.

关键词： cyclones precipitation winter East Asia monsoon

Structural morphological and Optical Properties of SnSb_2S_4 Thin Films Grown by Vacuum Evaporation method

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Journal of materials Science & Technology 2014年第10期30卷 1006-1011页

作者： N.Khedmi m.ben Rabeh m.Kanzari Laboratoire de Photovoltaques et matriaux de Semi-conducteurs-ENIT-Universit de Tunis el manar BP 37le belvedere1002 TunisTunisie Laboratoire de Photovoltaques et matriaux de Semi-conducteurs-ENIT-IPEITunis montfleury-Universit de Tunis Tunisie

SnSb2S4 thin films were prepared from powder by thermal evaporation under vacuum of 1.33 × 10^-4 Pa （ 10^-6 Torr） on unheated glass substrates. The effect of thickness on the structural, morphological and optical properties of SnSb2S4 thin films was investigated. Films thickness measured by interference fringes method varied from 50 to 700 nm. X-ray diffraction analysis revealed that all the SnSb2S4 films were polycrystalline in spite without heating the substrates and the crystallinity was improved with increasing film thickness. The microstructure parameters： crystallite size, strain and dislocation density were calculated. It was observed that the crystallite size increased and the crystal defects decreased with increasing film thickness. In addition, by increasing the film thickness, an enhancement in the surface roughness root-mean-square （RmS） increased from 2.0 to 6.6 nm. The fundamental optical parameters like band gap, absorption and extinction coefficient were calculated in the strong absorption region of transmittance and reflectance spectrum. The optical absorption measurements indicated that the band （Eg） gap of the thin films decreased from 2.10 to 1.65 eV with increasing film thickness. The refractive indexes were evaluated in transparent region in terms of envelope method, which was suggested by Swanepoul. It was observed that the refractive index increased with increasing film thickness.

关键词： Ternary system Thermal evaporation technique Thin films Thickness Atomic force microscopy (AFm)

A Coupled Cavitation model in an Oscillatory Oil Squeeze Film

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Computer modeling in Engineering & Sciences 2020年第4期123卷 129-152页

作者： Xu Liu Xiaoyang chen Rongyu Kang Xuejin Shen ben Ni Shanghai University Shanghai200072China Ford motor Company DearbornMI 48126USA

In this paper,the oscillatory oil squeeze film is taken as a research object,and a coupled cavitation model based on the theory of bubble dynamics and hydrodynamic lubrication is used and a specific method of numerical calculation is *** the parallel-plate squeeze film test apparatus is used to validate the coupled cavitation *** pictures of the cavitation were captured by a high-speed camera and then processed to obtain the variation of the cavitation area in *** with the experimental results,the model can successfully predict the process of generation and development of *** the same time,the pressure variation calculated by the model is in good agreement with the experimental data and the value of negative pressure is close to the *** this basis,three new parameters that are related to bubble dynamics are studied by comparing the pressure and cavitation area variation in an oscillating squeeze oil *** results show that surface dilatational viscosity,initial radii of cavitation nuclei and number of bubbles per unit area have a significant influence on the generation time of the cavitation,the maximum tensile stress that the oil film can withstand,and the speed of the cavitation collapse respectively.

关键词： Bubble dynamics oscillatory oil squeeze film cavitation