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Low working loss si/4H-siC heterojunction MOsFeT with analysis of the gate-controlled tunneling effect

Journal of electronic science and Technology 2023年第4期21卷 35-47页

作者： Hang chen You-Run Zhang state Key Laboratory of electronic Thin Films and Integrated Devices School of Integrated Circuit Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu610054China

A silicon (si)/silicon carbide (4H-siC) heterojunction double-trench metal-oxide-semiconductor field effect transistor (MOsFeT) (HDT-MOs) with the gate-controlled tunneling effect is proposed for the first time based on simulations. In this structure, the channel regions are made of si to take advantage of its high channel mobility and carrier density. The voltage-withstanding region is made of 4H-siC so that HDT-MOs has a high breakdown voltage (BV) similar to pure 4H-siC double-trench MOsFeTs (DT-MOss). The gate-controlled tunneling effect indicates that the gate voltage (V_(G)) has a remarkable influence on the tunneling current of the heterojunction. The accumulation layer formed with positive VG can reduce the width of the si/siC heterointerface barrier, similar to the heavily doped region in an Ohmic contact. This narrower barrier is easier for electrons to tunnel through, resulting in a lower heterointerface resistance. Thus, with similar BV (approximately 1770 V), the specific on-state resistance (R_(ON-sP)) of HDT-MOs is reduced by 0.77 mΩ·cm^(2) compared with that of DT-MOs. The gate-to-drain charge (Q_(GD)) and switching loss of HDT-MOs are 52.14% and 22.59% lower than those of DT-MOs, respectively, due to the lower gate platform voltage (V_(GP)) and the corresponding smaller variation (ΔV_(GP)). The figure of merit (Q_(GD)×R_(ON-sP)) of HDT-MOs decreases by 61.25%. Moreover, the heterointerface charges can reduce RON-sP of HDT-MOs due to trap-assisted tunneling while the heterointerface traps show the opposite effect. Therefore, the HDT-MOs structure can significantly reduce the working loss of siC MOsFeT, leading to a lower temperature rise when the devices are applied in the system.

关键词： Heterojunction On-state resistance silicon carbide(4H-siC)trench metal-oxide-semiconductor field effect transistors(MOsFeTs) switching loss

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Hot ductility behavior of V-N and V-Nb microalloyed steels

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 525-529页

作者： Bing-hua chen Hao Yu school of Materials science and engineering University of Science and Technology Beijing Beijing 100083 China

The hot ductility of V-N and V-Nb microalloyed steels was investigated on a Gleeble-1500 thermomechanical simulator, and the results were compared with those of V and Nb microalloyed steels. A ductility trough is found in both the steels in the temperature range of 700 to 1050℃. Compared to the V steel, the V-N steel has a wider and deeper ductility trough with the increase of N content, due to the in- creased precipitation of V（C, N） in the steel. Above 930℃, when 0.047wt% V is added to the 0.028wt% Nb-containing steel, the ductility becomes worse, owing to the rise of the onset dynamic recrystallization temperature. However, the ductility gets better at 800 to 930℃ be- cause of the coarsening of precipitates in austenite. With the improvement in ductility, the fracture mechanism is changed from intergranular to high ductile fracture in the temperature range of 800 to 1050℃.

关键词： alloy steel ductility dynamic recrystallization precipitation

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Modified-PVK-based Photorefractive Three-Component Low-T_(g) Composites

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Chinese Physics Letters 1999年第5期16卷 353-355页

作者： WANG Feng chen Zhi-jian GONG Qi-huang chen Yi-wang chen Hui-ying Department of Physics Mesoscopic Physics LaboratoryPeking UniversityBeijing 100871 Department of Chemistry Peking UniversityBeijing 100871

Two modified poly(N-carbazole),poly(2-carbazolylethyl methacrylate)(PCeMA)and poly(3-carbazolylpropyl methacrylate)(PCPMA),were *** with electro-optic(eO)chromophore 1-n-butoxyl-2,5-dimethyl-4-(4'-nitrophenylazo)benzene and the photosensitizer 2,4,7-trinitro-9-fluorenone,the eO response and photore-fractive(PR)effect were studied *** to the shorter spacer between the carbazolyl and the main-chain and thus a higher glass-transition-temperature T_(g),PCeMA-based composite exhibited an effective eO coefficient as only a quarter as that in PCPMA-based ***,a slight higher two-beam coupling coefficient and much faster PR response were observed in the *** was suggested that both the spacer length and the polymerization degree changed the T_(g) and the number density of traps,which decided the eO and PR responses.

关键词： coefficient faster shorter

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Holocene Hydroclimatic Variations in the Asian Drylands:Current Understanding and Future Perspectives

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Journal of earth science 2024年第1期35卷 292-295页

作者： Guoqiang Ding shengqian chen Yuanhao sun shuai Ma Jianhui chen MOe Key Laboratory of West China's environmental system College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Alpine Paleoecology and Human Adaptation Group State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and ResourcesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

0 *** intensification of global warming is generating increasing risks to human society and sustainable development,which are of growing concern to the international scientific community and policymakers(sun,2023).The ecosystems of the Asian drylands are fragile and highly sensitive to global changes;moreover,while these drylands are the most important areas of oasis agriculture on earth,their water resources are being adversely impacted by ongoing climate change(Zhang et al.,2023).Hence,an improved understanding of the patterns of climate change in this region is important and attracting increasing research attention.

关键词： Asian Holocene climatic

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Defined Contribution Pension Planning with the Return of Premiums Clauses and HARA Preference in stochastic environments

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Acta Mathematicae Applicatae sinica 2023年第2期39卷 396-423页

作者： Hao CHANG Xing-jiang chen school of Mathematical sciences Tiangong UniversityTianjin 300387China Department of Mathematical sciences School of EngineeringComputer and Mathematical SciencesAuckland University of TechnologyAucklandNew Zealand

This paper studies a defined contribution(DC)pension fund investment problem with return of premiums clauses in a stochastic interest rate and stochastic volatility *** practice,most of pension plans were subject to the return of premiums clauses to protect the rights of pension members who died before *** the mathematical modeling,we assume that a part of pension members could withdraw their premiums if they died before retirement and surviving members could equally share the difference between accumulated contributions and returned *** suppose that the financial market consists of a risk-free asset,a stock,and a zero-coupon *** interest rate is driven by a stochastic affine interest rate model and the stock price follows the Heston’s stochastic volatility model with stochastic interest *** fund managers have different risk preferences,and the hyperbolic absolute risk aversion(HARA)utility function is a general one including a power utility,an exponential utility,and a logarithm utility as special *** are concerned with an optimal portfolio to maximize the expected utility of terminal wealth by choosing the HARA utility function in the *** using the principle of dynamic programming and Legendre transform-dual theory,we obtain explicit solutions of optimal *** special cases are also derived in ***,a numerical simulation is provided to illustrate our results.

关键词： defined contribution pension plan return of premiums clauses stochastic interest rate HARA preference Legendre transform-dual theory stochastic optimal control

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Improving the Analyses and Forecasts of a Tropical squall Line Using Upper Tropospheric Infrared satellite Observations

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Advances in Atmospheric sciences 2022年第5期39卷 733-746页

作者： Man-Yau CHAN Xingchao chen Department of Meteorology and Atmospheric science and Center for Advanced Data Assimilation and Predictability TechniquesThe Pennsylvania State UniversityUniversity ParkPennsylvaniaPA 16802USA

The advent of modern geostationary satellite infrared radiance observations has noticeably improved numerical weather forecasts and ***,compared to midlatitude weather systems and tropical cyclones,research into using infrared radiance observations for numerically predicting and analyzing tropical mesoscale convective systems remain mostly *** tropical mesoscale convective systems play a crucial role in regional and global weather,this deficit should be *** study is the first of its kind to examine the potential impacts of assimilating all-sky upper tropospheric infrared radiance observations on the prediction of a tropical squall *** though these all-sky infrared radiance observations are not directly affected by lower-tropospheric winds,the high-frequency assimilation of these all-sky infrared radiance observations improved the analyses of the tropical squall line’s outflow *** from that,the assimilation of all-sky infrared radiance observations improved the analyses and prediction of the squall line’s cloud ***,reducing the frequency of assimilating these all-sky infrared radiance observations weakened these improvements to the analyzed outflow position,as well as the analyses and predictions of cloud fields.

关键词： data assimilation infrared satellite observations numerical weather prediction mesoscale convective systems tropical meteorology

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Organic ferroelastic enantiomers with high Tc and large dielectric switching ratio triggered by order-disorder and displacive phase transition

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Chinese Chemical Letters 2024年第10期35卷 228-232页

作者： Zhaohong chen Mengzhen Li Jinfei Lan shengqian Hu Xiaogang chen Ordered Matter science Research Center Nanchang UniversityNanchang 330031China

Molecular-based ferroelastics with dielectric switching properties are highly desirable for their applications on microelectronic dielectric switches,sensors,data storage,and so ***,the current reports mostly focus on organic-inorganic hybrids containing toxic heavy metal atoms,and the relatively low phase transition temperature limits their *** this paper,low-toxic organic salt ferroelastic enantiomers(R/s)-4-fluoro-1-azabicyclo[3.2.1]octonium chloride[(R/s)-F-321]were designed and synthesized under the introducing chirality *** undergo a 432F422-type ferroelastic phase transition with a high Curie temperature(Tc)of 470 K,simultaneously exhibiting excellent dielectric switching *** addition to the ordered-disordered movement of cations,the significant displacement of anions is also responsible for such high Tc and large dielectric switching ratios,which is very rare in molecular-based switching *** work enriches the development of molecular ferroelastic switching materials and gives inspiration for the exploration of environmentally friendly high Tc organic salt ferroelastics with prominent switching performances.

关键词： Organic salt enantiomers Ferroelastic Dielectric switching Phasetransition

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An undrained expansion solution of cylindrical cavity in sANICLAY for K_(0)-consolidated clays

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Journal of Rock Mechanics and Geotechnical engineering 2022年第3期14卷 922-935页

作者： Haohua chen Pin-Qiang Mo China University of Mining and Technology Xuzhou 221116China The University of Arizona TucsonAZ 85716USA

This paper proposes a rigorous undrained solution for cylindrical cavity expansion problems in K_(0)-consolidated clays,adopting a simple non-associated and anisotropic model,*** cavity expansion theory is well extended to consider non-associativity,K_(0)-consolidation and stress-induced anisotropy with combined rotational and distortional hardening of yield surface and plastic potential in the multiaxial stress *** developed solution can be recovered for validation against the modified Cam-clay(MCC)solution by simply setting model constants,avoiding non-associativity and *** source code is provided to facilitate the use for *** investigating the effects of overconsolidation ratio on the cavity pressure curves,stress distributions,evolutions of anisotropic parameters and stress paths,the variations with three-dimensional(3D)evolutions of yield surface and plastic potential during undrained cavity expansion are shown for various K_(0)-consolidated clays.A parametric study on the model constants is presented to depict the influences on the stress distributions and paths,critical state surfaces and Lode’s angles at *** proposed solution also provides a general framework for formulating equations for undrained expansion of cylindrical cavities under an initial cross anisotropic condition using sophisticated anisotropic soil *** serves as a precise benchmark for extensions of analytical solutions,numerical simulations of cavity expansion,and backcalculations of geotechnical problems.

关键词： Undrained cavity expansion sANICLAY K_(0)-consolidation Anisotropy

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Topological phase transitions and Majorana zero modes induced by the periodic potential in an antiferromagnetic chain

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Communications in Theoretical Physics 2023年第8期75卷 156-162页

作者： K W shen Q chen College of Physics and Mechanical&electrical engineering Jishou UniversityJishou 416000China school of Computational science and electronics Hunan Institute of EngineeringXiangtan 411104China

We investigate the topological properties of an antiferromagnetic(AFM)chain with an on-site periodic potential,considering the intrinsic spin–orbit coupling and an external Zeeman field along with the *** results indicate that Majorana zero modes(MZMs)can be observed by adjusting the strength of the periodic *** have calculated the energy spectrum,the wave-function and transport properties,and all these results support the existence of MZMs in the AFM ***,multiple topological phase transitions occur as the strength of the periodic potential changes,and several regions support MZMs.

关键词： AFM chain Majorana zero modes topological phase transitions periodic potential

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Finite Time Blow-up for Heat Flows of self-induced Harmonic Maps

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Acta Mathematica sinica,english series 2024年第11期40卷 2771-2808页

作者： Bo chen You De WANG school of Mathematics South China University of TechnologyGuangzhou510640P.R.China school of Mathematics and Information sciences Guangzhou UniversityGuangzhouP.R.China Hua Loo-Keng Key Laboratory of Mathematics Institute of MathematicsAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing100190P.R.China school of Mathematical sciences University of Chinese Academy of SciencesBeijing100049P.R.China

Let Mn be an embedded closed submanifold ofR^(k+1) or a smooth bounded domain inR_(n),where n≥*** show that the local smooth solution to the heat flow of self-induced harmonic map will blow up at a finite time,provid... 详细信息

关键词： Heat flow of self-induced harmonic map Landau-Lifshitz-Gilbert equation Finite time blow-up

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