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Non-isothermal Kinetics of Pyrolysis of Three Kinds of Fresh Biomass

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Journal of China University of Mining and Technology 2007年第1期17卷 105-111页

作者： MIN Fan-fei ZHANG Ming-xu chen Qing-ru Department of Matertal Sctence and Engmeermg Anhut Umverstty of Sctence and Technology Huaman Anhut 232001 China Key Laboratory of Modern Mining Engineering of Anhui Province Huainan Anhui 232001 China School of Chemical and Engineering Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The pyrolysis kinetics of three different kinds of fresh biomass (grass: triple A, wheat straw, corn straw) in nitrogen flow were studied by thermogravimetric analysis at five different heating rates. The kinetic parameters of the pyrolysis process were calculated using the method of Ozawa-Flynn-Wall and the mechanism of reactions were investi- gated using the method of Popescu. It was found that the values of activation energy varied in different temperature ranges. The pyrolysis processes are well described by the models of Zhuravlev (Zh) and valid for diffusion-controlled between 200 ℃ and 280 ℃, by Ginstling-Brounshtein (G-B), valid for diffusion-control between 280 ℃ and 310 ℃, for first-order chemical reaction between 310℃ and 350 ℃, by Zhuravlev (Zh) valid for diffusion-control between 350 ℃ and 430 ℃ and by the one-way transport model when temperatures are over 430 ℃.

关键词： non-isothermal kinetics fresh biomass pyrolysis thermogravimetric analysis

Characterization of Staphylococcus aureus Isolated from Clinical Specimens by Matrix Assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry

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Biomedical and Environmental Sciences 2013年第6期26卷 430-436页

作者： WANG Ye ru chen Qian CUI Sheng Hui LI Feng Qin Institute of Nutrition and Food Safety Chinese Centre for Disease Control and Prevention Key Laboratory of Food Safety Risk Assessment Ministry of HealthChina National Centre for Food Safety Risk Assessment Beijing Municipal Centre for Disease Control and Prevention National Institute for Food and Drug Control

Objective To develop a matrix assisted laser desorption/ionization time-of-flight mass spectrometry （MALDI-TOF-MS） approach to identify Staphylococcus aureus （5. aureus） and differentiate methicillin-resistant 5. aureus （MRSA） from methicillin-sensitive S. aureus （MSSA）. Methods A total of 100 5. aureus strains isolated from clinical specimens and farm workers were collected and analyzed by MALDI-TOF-MS. And data obtained were interpreted with biotyper software. Results Ninety-two strains were identified by MALDI-TOF-MS as 5. aureus at a level of secure genus and probable species, and 4 strains were identified at probable genus after their cultivation, spectral collection and data preprocessing. One strain was identified as 5. aureus with lower score. It was revealed that identification of 5. aureus by MALDI-TOF-MS was highly correlated with typing by biochemical and serological methods with an accuracy as high as 97%. The biotyper cluster analysis showed that 100 isolates were divided into 2 types at the distance level of 400. Higher peak intensity in the mass of both 3784 Da and 5700 Da was observed in MRSA, whereas that was absent from MSSA. Conclusion MALDI-TOF-MS is considered as a simple, high-throughput and accuracy for the identification of S from MSSA. rapid and highly reproducible technique with aureus and it can reliably differentiate MRSA

关键词： Staphylococcus aureus Characterization MRSA MSSA MALDI-TOF-MS

Physical investigation of subthreshold swing degradation behavior in negative capacitance FET

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Science China(Information Sciences) 2022年第6期65卷 241-246页

作者： Mengxuan YANG Qianqian HUANG Kaifeng WANG Chang SU Liang chen Yangyuan WANG ru HUANG Key Laboratory of Microelectronic Devices and Circuits (MOE) Institute of MicroelectronicsPeking University Beijing Laboratory of Future IC Technology and Science Peking University

Power consumption has become one of the bottlenecks limiting the future development of integrated circuits. Tunnel FETs(TFETs) and negative capacitance FETs(NCFETs) can break the subthreshold swing limitation(60 mV/dec at room temperature) of conventional metal-oxide-semiconductor field-effect transistor(MOSFET) to reduce the operating voltage and thus power consumption. However, induced by the band-to-band tunneling mechanism, TFETs have a subthreshold swing degradation issue and relatively low ON current. Although NCFETs with ferroelectric/dielectric gate stack can theoretically maintain a high ON current comparable to conventional MOSFET, the physical origin of sub-60 SS is controversial and the mechanism of switching behavior in NCFET is still not clear. In this work, by experimentally investigating the whole negative differential capacitance process and its gate voltage amplification coefficient, an intrinsic issue of SS degradation with increased gate voltage is also found in NCFET for the first time. Based on the physical investigation and simulation results, it is shown that the intrinsic SS degradation in NCFET is resulting from the instant dielectric polarization response. Both the decrease of dielectric thickness and the increase of dielectric constant may lead to the severer SS degradation, which is not favorable for scaled NCFETs.

关键词： ferroelectric negative differential capacitance effect polarization low power voltage amplification

Preparation and optical properties of Nb-NbN multilayer films as solar selective absorptive coatings

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Rare Metals 2006年第Z1期25卷 355-359页

作者： WANG Cong DU Xinkang WANG Tianmin ZHOU Long ru Ning chen Buliang Center for Condensed Matter and Materials Physics School of Science Beijing University of Aeronoutics and Astronantics Beijing 100083 China Center for Condensed Matter and Materials Physics School of Science Beijing University of Aeronoutics and Astronantics Beijing 100083 China Mechanical Engineering College Shijiazhuang 050003 China Center for Condensed Matter and Materials Physics School of Science Beijing University of Aeronoutics and Astronantics Beijing 100083 China Center for Condensed Matter and Materials Physics School of Science Beijing University of Aeronoutics and Astronantics Beijing 100083 China Center for Condensed Matter and Materials Physics School of Science Beijing University of Aeronoutics and Astronantics Beijing 100083 China China Academy of Space Technology Beijing 100029 China

Based on the cermet double layer structure, Nb-NbN multi-layer films for solar selective coatings were deposited by direct current reactive magnetron sputtering. The Nb/Nb-NbN/Al2O3 trilayered structure was deposited on a stainless steel (SS) substrate by using a single niobium target. The expected components were adjusted by changing the gas flowing ratios of Ar: N2. The Al2O3 antireflective layer on the top of the film was produced by r. f. magnetron sputtering using Al2O3 ceramic target. A solar absorptivity of 0.94 and a normal emissivity of 0.16 at room temperature have been achieved for the coating. Thermal vacuum aging to the samples was carried out at 350 and 500 ℃ for 1 h. The results show a good thermal stability. Microstructure and its dependence on temperature of the Nb, NbN and Nb-NbN single layers were investigated, respectively.

关键词： Nb-NbN cermet film solar selective coating magnetron sputtering

One-step plasmonic welding and photolithographic patterning of silver nanowire network by UV-programable surface atom diffusion

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Nano Research 2022年第3期15卷 2582-2591页

作者： Gui-Shi Liu Ting Wang Yexiong Wang Huajian Zheng Yunsen chen Zijie Zeng Lei chen Yaofei chen Bo-ru Yang Yunhan Luo Zhe chen Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Key Laboratory of Visible Light Communications of GuangzhouKey Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education InstitutesDepartment of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China

Silver nanowire(AgNW)based transparent electrode(TE)plays a pivotal role in optoelectronics where TE is generally required to have fine pattern and high *** the rapid technological advances in either welding or patterning of AgNWs,there are few studies that combine the two processes in a simple and practical ***,aiming to fabricate high-performance patterned AgNW TE,we develop a simplified photolithography that enables both plasmonic nanowelding with low-level UV exposure(20 mW/cm^(2))and high-resolution micropatterning without photoresist and etching process by conjugating AgNW with diphenyliodonium nitrate(DPIN)and UV-curable *** cellulose as a binder can effectively enhance plasmonic heating,adhesion,and stability,while the photosensitive DPIN,capable of modulating surface atom diffusion,can boost the plasmonic welding at AgNW junction and induce patterning in AgNW network with Plateau-Rayleigh *** fabricated AgNW TE has high figure of merit of up to 1,000(3.7Ω/sq at 90%transmittance)and minimal pattern size down to 3µm,along with superior ***,a flexible smart window with high performance is demonstrated using the patterned and welded AgNW TEs,verifying the applicability of the simplified photolithography technique to optoelectronic devices.

关键词： silver nanowires plasmonic welding patterning Plateau-Rayleigh instability transparent electrodes

Palladium-catalyzed stereoselective decarboxylative[4+2]cyclization of 2-methylidenetrimethylene carbonates with pyrrolidone-derived enones:Straightforward access to chiral tetrahydropyran-fused spiro-pyrrolidine-2,3-diones

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Chinese Chemical Letters 2024年第6期35卷 279-282页

作者： Ke Zhang Sheng Zuo Pengyuan You Tong ru Fen-Er chen Key Laboratory of Natural Medicines of the Changbai Mountain Ministry of EducationCollege of PharmacyYanbian UniversityYanji 133002China College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China Engineering Center of Catalysis and Synthesis for Chiral Molecules Fudan UniversityShanghai 200433China Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs Shanghai 200433China

A novel asymmetric[4+2]cycloaddition of 2-methylidenetrimethylene carbonate with pyrrolidonederived enones has been achieved to produce the functionalized tetrahydropyran-fused spirocyclic scaffolds via *** array of enantioenriched spiro-pyrrolidine-2,3-diones bearing adjacent quaternary and tertiary stereocenters are obtained in high yields with excellent enantioselectivities(up to 96% yield and 99% ee).The further transformation of the product has been accomplished for the construction of medical interesting β^(2,2)-amino acids and β-*** mechanistic research was well conducted.

关键词： Pyrrolidine-2,3-diones 2-Methylidenetrimethylene carbonate Asymmetric annulation Spiroheterocycles Allylic 1,3-strain

Transport of nanodimers through chemical microchip

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Communications in Theoretical Physics 2020年第1期72卷 130-134页

作者： Shun Zhan ru-Fei Cui Li-Yan Qiao Jiang-Xing chen Department of Physics Hangzhou Dianzi UniversityHangzhou310018China Department of Physics Zhejiang UniversityHangzhou310018China

We propose a new microfluid chip for transporting micro and nano *** device consists of chemical stripe pathways full of fuel species,which can be realized in experiments by chemical surface reactions that form spatiotemporal patterns.A mesoscopic model is constructed to simulate the transport dynamics of nanodimers passing through the *** is found that the increases of the volume fraction and radius of the dimer both decrease the first reach time although the underlying mechanisms are different:the volume fraction affects the probability of touching and entering the chip while the radius determines the self-propulsion within the *** transport efficiency is influenced by the size of the particles.

关键词： microchip catalytically sphere dimers chemical pathway multiparticle collision dynamics transport

Experimental Study of Hydrodynamic and Self-Buried Behavior of Submarine Pipeline with Perpendicular Spoilers

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China Ocean Engineering 2021年第2期35卷 250-261页

作者： FAN Hong-xia WANG Jian-zhong ZHU Li-jun WANG Nai-ru chen Huai State Key Laboratory of Hydrology Water Resources and Hydraulic EngineeringNanjing Hydraulic Research InstituteNanjing 210029China

The spoiler is a kind of device to disturb current and promote *** present,all submarine pipeline spoilers at home and abroad are parallel spoilers,that is,the plane of the spoiler is parallel to the vertical plane of the pipeline *** to the results of indoor experiments,when the pipeline with the forward spoiler is installed perpendicular to the direction of water flow,the spoiler will accelerate the seabed erosion and cause the pipeline to endure downward pressure,which will eventually cause the pipeline self-buried to form a ***,when the pipeline direction is consistent with the flow direction,the self-buried behavior and protective effect is *** aiming at the defect that the forward spoiler cannot be self-buried when the direction of the pipeline and the flow are basically parallel,the spoiler burying aid device perpendicular to the pipeline axis has been innovatively developed,and the hydrodynamic changes and sediment erosion characteristics near the pipeline after the installation of the device were studied based on the *** reveal that although the perpendicular spoiler cannot generate downforce,it can greatly increase the turbulent kinetic energy of the flow and the rate of sediment *** larger the angle between the pipeline axis and the spoiler plane is,the larger the increase in turbulent energy will *** increase in turbulent energy near the bed surface can reach up about 70%when the angle is 90°,while serious sediment erosion mainly occurs along both sides of the pipeline with a distance of about 2−4 times the pipe *** the future,we can further explore the influence of the perpendicular spoiler size and installation position on the pipeline downforce and the effect of burying *** the same time,field tests on the perpendicular spoiler burying aid device currently developed will conduct to observe the actual effect of perpendicular spoiler promoting pipeline scouring and buryi

关键词： submarine pipeline spoiler self-burial turbulent kinetic energy sediment erosion

A mini-review of the electro-peroxone technology for wastewaters:Characteristics,mechanism and prospect

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Chinese Chemical Letters 2023年第9期34卷 7-14页

作者： Lu chen Lanlan Wei Yifan ru Mili Weng Lin Wang Qizhou Dai College of Environment Zhejiang University of TechnologyHangzhou 310032China College of Environmental and Resources Sciences Zhejiang A&F UniversityHangzhou 311300China School of Biological and Chemical Engineering NingboTech UniversityNingbo 315100China

The electro-peroxone technology,a novel type of advanced oxidation technology,is widely used in wastewater ***,this paper reviews the advantages and problems of the electro-peroxone technology compared with electrochemical oxidation technology,ozonation technology,and traditional peroxone *** to the high kinetics of pollutant degradation,the electro-peroxone process can reduce the reaction time and energy consumption of pollutant treatment in *** electroperoxone technology can promote pollutant degradation and mineralization,which shows obvious synergistic effects of electrochemical oxidation and ozonation for wastewater *** importantly,the research mechanism of the electro-peroxone technology is systematically introduced from two aspects of cathode reaction and bulk *** influence of experimental parameters on the wastewater treatment effect is also ***,the potential applications and future research directions of the electro-peroxone technology in the wastewater field are *** electro-peroxone process can offer a highly efficient and energy saving water treatment method to improve the performance of existing ozonation and electrochemical systems and has therefore become a promising electrochemical advanced oxidation process for wastewater treatment.

关键词： The electro-peroxone technology Electrochemical oxidation‘Ozonation Hydrogen peroxide Wastewater treatment