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Carbon Energy 2021年第6期3卷 916-928页

作者： Ke Li Wei Shen Tao Xu Lu Yang Xiaobing Xu Feiyao Yang Lijuan Zhang Yangjian Wang Yaning Zhou Mengjuan Zhong Di Wei division of g-device technology Beijing Graphene InstituteBeijingChina

Replacement of flammable liquid electrolytes with gel polymer electrolytes(gPEs)is a promising route to improve the safety of lithium-ion batteries(LIBs).However,polymer-based electrolytes have limited suitability at low/high temperatures due to the instability of the polymer at high temperatures and the low ionic conductivity of the gel state at low ***,an integrated design of electrodes/fibrous gPEs modified with graphene oxide(gO)is *** to the integrated structure of electrodes/gPEs,the strong interface affinity between electrodes and gPEs ensures that the gPEs spun on electrodes do not shrink at high temperatures(160-180℃),thus preventing a short circuit of ***,after gO modification,oxygen-containing functional groups of gO can accelerate Li^(+)transport of gO-gPEs even at a low temperature of−15℃.When these gPEs are applied to flexible LIBs,the LIBs show excellent electrochemical performance,with satisfactory cycling stability of 82.9%at 1 C after 1000 cycles at 25℃.More importantly,at a high temperature of 160℃,the LIBs can also discharge normally and light the green light-emitting ***,at a low temperature of−15℃,92.7%of its room-temperature capacity can be obtained due to the accelerated Li^(+)transport caused by gO modification,demonstrating the great potential of this electrolyte and integrated structure for practical gel polymer LIB applications.

关键词： flexible battery gel polymer electrolyte graphene oxide safe lithium-ion battery

Electrochemical engineering approach of high performance solid-state flexible supercapacitor device based on chemically synthesized VS_2 nanoregime structure

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Journal of Energy Chemistry 2019年第4期28卷 79-88页

作者： Bidhan Pandit Lakshmana Kumar Bommineedi Babasaheb R.Sankapal Nano Materials and device Laboratory Department of Physics Visvesvaraya National Institute of Technology

Portable and furnished electronics appliances demand power efficient energy storage devices where electrochemical supercapacitors gain much more *** this concern,a simple,low-cost and industry scalable successive ionic layer adsorption and reaction(SILAR)approach has been adopted to deposit nanostructured VS_2onto flexible and light-weight stainless steel(SS)substrate towards supercapacitor *** nanocrystalline nature with hexagonal crystal structure has been confirmed for VS_2through structural *** VS_2electrode exhibits a maximum specific capacitance of 349 F g^(-1)with a super stable behavior in three-electrode liquid-state *** flexible symmetric solid-state supercapacitor(FSSC)device using gel electrolyte yields specific power of 1.5 k W kg^(-1)(specific energy of 25.9 Wh kg^(-1))with a widen voltage window of 1.6 V.A red LED has been glown for30 s using the system consisted of two devices in series ***,the system glows a combination of 21 red LEDs network with acronym‘VNIT’,demonstrating commercial *** attribution of device demonstration even under mechanical stress holds great promise towards advanced flexible electronics application.

关键词： Chemical method vs2 Supercapacitor gel electrolyte Symmetric device

New approach for particle size and shape analysis of iron-based oxygen carriers at multiple oxidation states

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Particuology 2024年第7期90卷 493-503页

作者： Victor Purnomo Marcelo Dal Belo Takehara Robin Faust Lidiya Abdisa Ejjeta Henrik Leion division of Energy and Materials Department of Chemistry and Chemical EngineeringChalmers University of TechnologyGöteborg 41258Sweden division of Energy Science Department of Engineering Sciences and MathematicsLuleåUniversity of TechnologyLuleå97187Sweden

One of the crucial issues in the chemical looping technology lies in its bed material:the oxygen *** size analysis of an oxygen carrier is important since in a fluidized bed the material can only work well within a specific size *** the favorable size ranges for oxygen carrier materials have already been reported,none of the published studies has analyzed the particle size and shape of oxygen carriers in ***,the effect of oxygen carriers'oxidation degree on such properties has not been considered *** study aimed to report the particle size and shape analysis of five iron-based oxygen carriers,one natural ore,one synthetic material,and three residue products,at different oxidation degrees using dynamic image analysis(DIA).The oxygen carriers were prepared at different mass conversion degrees in a fluidized bed batch *** size distribution,sphericity,and aspect ratio of the oxygen carrier particles were examined experimentally using a Camsizer *** results show that the DIA method was successfully able to analyze the particle size and shape of our oxygen carriers with satisfying accuracy for *** oxidation state of the investigated materials seems to only affect the particle size and shape of oxygen carriers to a minor ***,exposures to redox cycles in a fluidized bed reactor may alter the particle size and shape of most oxygen carriers.

关键词： Oxygen carrier Size and shape analysis Dynamic image analysis Oxidation state Fluidized bed Chemical looping

Scanning tunneling microscopy of buried dopants in silicon:images and their uncertainties

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npj Computational Materials 2022年第1期8卷 1727-1735页

作者： Piotr T.Różański garnett W.Bryant MichałZieliński Institute of Physics Faculty of PhysicsAstronomy and InformaticsNicolaus Copernicus University in ToruńToruńPoland Nanoscale device Characterization division National Institute of Standards and TechnologyGaithersburgMD20899-8423USA

The ability to determine the locations of phosphorous dopants in silicon is crucial for the design,modelling,and analysis of atom-based nanoscale devices for future quantum computing ***,several papers showed that a metrology of scanning tunnelling microscopy(STM)imaging combined with atomistic tight-binding simulations could be used to determine coordinates of a dopant buried close to a Si *** identify effects which play a crucial role in the simulation of STM images and have to be precisely modelled for STM imaging of buried dopants and multi-dopant clusters to provide reliable position *** contrast to previous work,we demonstrate that a metrology combining STM imaging with tight-binding simulations may lead to pronounced uncertainty due to tip orbital model,effects of dangling bonds and choice of local atomic basis for the tight-binding *** work is still needed to obtain a reliable STM metrology of buried dopant position.

关键词： dopant buried metrology

116 dB dynamic range CMOS readout circuit for MEMS capacitive accelerometer

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Journal of Semiconductors 2014年第9期35卷 117-121页

作者：龙善丽刘艳贺克军唐兴刚陈钱 Huadong Photoelectric Integrated device Research Institute Nanjing University of Science & technology

A high stability in-circuit reprogrammable technique control system for a capacitive MEMS accelerometer is presented. Modulation and demodulation are used to separate the signal from the low frequency noise. A low-noise low-offset charge integrator is employed in this circuit to implement a capacitance-to-voltage converter and minimize the noise and offset. The application-specific integrated circuit （ASIC） is fabricated in a 0.5 /μm one-ploy three-metal CMOS process. The measured results of the proposed circuit show that the noise floor of the ASIC is -116 dBV, the sensitivity of the accelerometer is 66 mV/g with a nonlinearity of 0.5%. The chip occupies 3.5×2.5 mm2 and the current is 3.5 mA.

关键词： in-circuit reprogrammable technique MEMS accelerometer modulation and demodulation sensitiv-ity of accelerometer

Combined Moho Parameters Determination Using CRUST1.0 and Vening Meinesz-Moritz Model

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Journal of Earth Science 2015年第4期26卷 607-616页

作者： Majid Abrehdary Lars E.Sjberg Mohammad Bagherbandi division of geodesy and Satellite Positioning Royal Institute of Technology (KTH) Department of Industrial Development IT and Land ManagementUniversity of G?vle

According to Vening Meinesz-Moritz （VMM） global inverse isostatic problem, either the Moho density contrast （crust-mantle density contrast） or the Moho geometry can be estimated by solv- ing a non-linear Fredholm integral equation of the first kind. Here solutions to the two Moho parame- ters are presented by combining the global geopotential model （gOCO-03S）, topography （DTM2006） and a seismic crust model, the latter being the recent digital global crustal model （CRUST1.0） with a resolution of 1°×1°. The numerical results show that the estimated Moho density contrast varies from 21 to 637 kg/m3, with a global average of 321 kg/m^3, and the estimated Moho depth varies from 6 to 86 km with a global average of 24 km. Comparing the Moho density contrasts estimated using our least-squares method and those derived by the CRUST1.0, CRUST2.0, and PREM models shows that our estimate agrees fairly well with CRUST1.0 model and rather poor with other models. The estimated Moho depths by our least-squares method and the CRUST1.0 model agree to 4.8 km in RMS and with the gEMMA1.0 based model to 6.3 km.

关键词： CRUST1.0 density contrast isostasy Moho sediment thickness.

Strategies to increase tolerance and robustness of industrial microorganisms

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Synthetic and Systems Biotechnology 2022年第1期7卷 533-540页

作者： Marta Tous Mohedano Oliver Konzock Yun Chen division of Systems and Synthetic Biology Department of Biology and Biological EngineeringChalmers University of TechnologyGöteborgSweden

The development of a cost-competitive bioprocess requires that the cell factory converts the feedstock into the product of interest at high rates and ***,microbial cell factories are exposed to a variety of different stresses during the fermentation *** stresses can be derived from feedstocks,metabolism,or industrial production processes,limiting production capacity and diminishing *** stress tolerance and robustness allows for more efficient production and ultimately makes a process more economically *** review summarises general trends and updates the most recent developments in technologies to improve the stress tolerance of *** first look at evolutionary,systems biology and computational methods as examples of non-rational *** we review the(semi-)rational approaches of membrane and tran-scription factor engineering for improving tolerance *** further discuss challenges and perspectives associated with these different approaches.

关键词： Toxicity Novel synthetic biology tools Systems biology genome-scale model Membrane engineering Transcription factor engineering

DEM simulation of influence of parameters on energy and degree of mixing

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Particuology 2011年第4期9卷 406-413页

作者： Simo Siiri Jouko Yliruusi division of Pharmaceutical technology University of HelsinkiFinland

Powder mixing is being modeled using a simulation based on Newtonian mechanics. Variables under consideration include particle friction and the amplitude, frequency, and direction of shaking. Trajectories for each particle were recorded, and a mixing degree was calculated for each simulation, for which the average energy transferred into the powder system was recorded and compared to the resulting mixing degree. Mixing of particles originally located near the bottom was studied separately, as was the mixing of particles near the surface. This study shows that choosing the proper mixing parameters not only enhances the final result of mixing, but also yields good results with less strain on the material mixed and on the mixing device.

关键词： Simulation Mixing Mixing degree Energy

Pitting and stress corrosion cracking studies on AISI type 316N stainless steel weldments

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Defence technology（防务技术） 2018年第3期14卷 226-237页

作者： Anita Toppo M.g.Pujar N.Sreevidya John Philip Corrosion Science and technology division Indira Gandhi Centre for Atomic Research Materials Development and technology division Indira Gandhi Centre for Atomic Research

Pitting and stress corrosion cracking(SCC) studies on the 316 N stainless steel(SS) weldments in aswelded(AW) and thermally aged(solution annealing(SA), 550C/4 h and 750C/1 h) conditions were carried out in acidic and acidic chloride media. Pitting corrosion and SCC resistance was the highest for SA weldment, which was attributed to homogenization of microstructural and microchemical heterogeneities during solution annealing. SA specimen showed the most stable passive film as compared to AW weldment because of higher amount of delta-ferrite in AW weld metal, which resulted in an increased heterogeneity and inferior SCC resistance in AW. Stability of passive film was found to be adversely affected due to heat treatments(at 550C/4 h and 750C/1 h) because of the precipitation of carbide and sigma phases.

关键词：压力腐蚀不锈钢 AISI 焊接金属 SCC 稳定性氯化物微结构

Theory of the magnon Kerr effect in cavity magnonics

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Science China(Physics,Mechanics & Astronomy) 2019年第8期62卷 93-103页

作者： guoQiang Zhang YiPu Wang JianQiang You Quantum Physics and Quantum Information division Beijing Computational Science Research Center Interdisciplinary Center of Quantum Information and Zhejiang Province Key Laboratory of Quantum technology and device Department of Physics and State Key Laboratory of Modern Optical Instrumentation Zhejiang University

We develop a theory for the magnon Kerr effect in a cavity magnonics system, consisting of magnons in a small yttrium iron garnet(YIg) sphere strongly coupled to cavity photons, and use it to study the bistability in this hybrid system. To have a complete picture of the bistability phenomenon, we analyze two different cases in driving the cavity magnonics system, i.e.,directly pumping the YIg sphere and the cavity, respectively. In both cases, the magnon frequency shifts due to the Kerr effect exhibit a similar bistable behavior but the corresponding critical powers are different. Moreover, we show how the bistability of the system can be demonstrated using the transmission spectrum of the cavity. Our results are valid in a wide parameter regime and generalize the theory of bistability in a cavity magnonics system.

关键词： magnon Kerr effect cavity magnonics bistability hybrid system