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Substrate bias effects in p-channel Gan-on-Si transistors

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Science China(Information Sciences) 2025年第1期68卷 404-405页

作者： Mengyao ZHAO Jie MA Lanlan YAnG Chuanqi PAn Denggui WAnG Jianjun ZHOU Sheng LI Jiaxing WEI Long ZHAnG Siyang liu Weifeng SUn national ASIC System Engineering Research Center School of Integrated Circuits Southeast University national Center of Technology Innovation for Electronic Design Automation Southeast University national Key Laboratory of Solid-State Microwave Devices and Circuits

The drain current （ID） of the n-channel Gan field-effecttransistor （n-FET） is influenced by the substrate-to-source bias voltage (VBS)（substrate bias effect）[1].Actually,nonzero VBSis also likely to occur in p-FET in real application,because the source electrode of p-FET is usually connected to high *** study reports the dependency between IDand VBSin p-FET for the first time,and analyzes the underlying mechanisms from the perspective of vertical electric field （EF） distribution.

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Riemann-Hilbert problems and n-soliton solutions of the nonlocal reverse space-time Chen-Lee-liu equation

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Communications in Theoretical Physics 2023年第3期75卷 12-19页

作者： Tongshuai liu Tiecheng Xia Department of Mathematics Shanghai UniversityShanghai200444China

In this paper,the n-soliton solutions to the nonlocal reverse space-time Chen-Lee-liu equation have been *** the nonlocal symmetry reduction to the matrix spectral problem,the nonlocal reverse space-time Chen-Lee-liu equation can be *** on the spectral problem,the specific matrix Riemann-Hilbert problem is constructed for this nonlocal *** solving this associated Riemann-Hilbert problem,the n-soliton solutions to this nonlocal equation can be obtained in the case of the jump matrix as an identity matrix.

关键词： Riemann-Hilbert problem nonlocal reverse space-time Chen-Lee-liu equation n-soliton solution

High-precision magnetic field measurement system based on a coherent population trapping magnetometer onboard the SATech-01 satellite

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Science China Technological Sciences 2025年

作者： Hongbo XUE Wei SOnG Haoran ZHAO Yiteng ZHAnG Shanzhi YE Jindong WAnG Ran TAO Peng SAnG Keli CHEn Xingzi BI Bingjun CHEnG Bin ZHOU Yongliang XUE Yingying TAnG liu liu Jinsong LI Xiaocheng ZHU Baoquan LI Jinguo liu Wen CHEn Xiaofeng ZHAnG Yonghe ZHAnG Lei LI State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences Key Laboratory of Solar Activity and Space Weather National Space Science Center Chinese Academy of Sciences Key Laboratory of Electronics and Information Technology for Space Systems National Space Science Center Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Innovation Academy for Microsatellites Chinese Academy of Sciences

On July 27, 2022, a high-precision system for measuring the magnetic field based on a coherent population trapping magnetometer（referred to as the CPT system） was launched onboard the Space Advanced Technology demonstration satellite（SATech-01） by a ZK-1A rocket. The payload comprises a scalar coherent population trapping magnetometer（CPTM）, triaxial anisotropic magnetoresistance magnetometer（AMRM）, and nano star tracker mounted on a non-magnetic telescopic tubular mast. This configuration enables synchronized measurement of scalar and vector geomagnetic fields, as well as the attitude,making the payload with its compact sensors suitable for applications on miniature satellite platforms. On november 7, 2022,the novel telescopic tubular mast was deployed in orbit, extending to a length of 5.28 m. The CPTM, an absolute scalar magnetometer with an omnidirectional sensor, is the first China-developed quantum/atomic magnetometer successfully operating in space. In orbit, the CPTM has sensitivity of ～10 pT/Hz1/2and can automatically operate under complex magnetic field variations. The difference between the scalar fields obtained using the CPTM and CHAOS model has a mean deviation of–3.73 n T and a standard deviation of 26.11 nT（1σ）, without on-orbit calibration or correction. The miniaturized AMRM has a sensitivity of ～0.3 n T/Hz1/2and maintains stable and reliable operation in orbit. The low-power and miniaturized nano star tracker has a measurement uncertainty of 14.23″（1σ） in orbit. The mission has realized the on-orbit technical verification of the integrated and synchronized detection of the vector magnetic field and attitude and fully validated the system's performance,automation level, and reliability.

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Asymptotic solutions of the flow of a Johnson-Segalman fluid through a slowly varying pipe using double perturbation strategy

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Applied Mathematics and Mechanics(English Edition) 2018年第2期39卷 169-180页

作者： Xinyin ZOU Xiang QIU Jianping LUO Jiahua LI P.n.KALOnI Yulu liu School of Mechanical Engineering Shanghai Institute of Technology School of Science Shanghai Institute of Technology College of Urban Construction and Safety Engineering Shanghai Institute of Technology Department of Mathematics and Statistics University of Windsor Shanghai Institute of Applied Mathematics and Mechanics Shanghai University

A double perturbation strategy is presented to solve the asymptotic solutions of a Johnson-Segalman （J-S） fluid through a slowly varying pipe. First, a small parameter of the slowly varying angle is taken as the small perturbation parameter, and then the second-order asymptotic solution of the flow of a newtonian fluid through a slowly varying pipe is obtained in the first perturbation strategy. Second, the viscoelastic parameter is selected as the small perturbation parameter in the second perturbation strategy to solve the asymptotic solution of the flow of a J-S fluid through a slowly varying pipe. Finally, the parameter effects, including the axial distance, the slowly varying angle, and the Reynolds number, on the velocity distributions are analyzed. The results show that the increases in both the axial distance and the slowly varying angle make the axial velocity slow down. However, the radial velocity increases with the slowly varying angle, and decreases with the axial distance. There are two special positions in the distribution curves of the axial velocity and the radial velocity with different Reynolds numbers, and there are different trends on both sides of the special positions. The double perturbation strategy is applicable to such problems with the flow of a non-newtonian fluid through a slowly varying pipe.

关键词： Johnson-Segalman (J-S) fluid slowly varying pipe double perturbationstrategy velocity distribution

Syntheses of DL-threo-Thiamphenicol via Green Oxidation

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Chemical Research in Chinese Universities 2006年第5期22卷 602-605页

作者： liu Kai Robert Franzén YU Xiao-jing ZHAnG Jun XU You-jun School of Pharmaceutical Engineering Shenyang Pharmaceutical University Shenyang 110016 P. R. China Institute of Materials Chemistry Tampere University of Technology Korkeakoulunkatu 8 FIN-33720 Tampere Finland

Four methyl aryl thioethers related to thiamphenicol syntheses and methyl phenyl sulfide were cleanly oxidized into methyl sulfones in high to excellent yields via catalytic green oxidation with aqueous hydrogen peroxide in combination with sodium tungstate. When the same reactions were similarly performed in the absence of the catalyst, the corresponding sulfoxides could be obtained. This viable synthetic approach for the synthesis of DL-threo-thiamphenicol is a simple procedure, which has an economic advantage in view of its application for the large-scale synthesis because it can be carried out under mild conditions.

关键词： Green oxidation Hydrogen peroxide Sodium tungstate Thiamphenicol

A Strong Stability-Preserving Predictor-Corrector Method for the Simulation of Elastic Wave Propagation in Anisotropic Media

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Communications in Computational Physics 2012年第9期12卷 1006-1032页

作者： D.H.Yang n.Wang E.liu Department of Mathematical Sciences Tsinghua UniversityBeijing 100084P.R.China Department of Geophysics China University of Mining and TechnologyXuzhouJiangsu ProvinceP.R.China

In this paper,we propose a strong stability-preserving predictor-corrector(SSPC)method based on an implicit Runge-Kutta method to solve the acoustic-and elastic-wave *** first transform the wave equations into a system of ordinary differential equations(ODEs)and apply the local extrapolation method to discretize the spatial high-order derivatives,resulting in a system of semi-discrete *** we use the SSPC method based on an implicit Runge-Kutta method to solve the semi-discrete ODEs and introduce a weighting parameter into the SSPC *** top of such a structure,we develop a robust numerical algorithm to effectively suppress the numerical dispersion,which is usually caused by the discretization of wave equations when coarse grids are used or geological models have large velocity contrasts between adjacent ***,we investigate the performance of the SSPC method including numerical errors and convergence rate,numerical dispersion,and stability criteria with different choices of the weighting parameter to solve 1-D and 2-D acoustic-and elastic-wave *** the SSPC is applied to seismic simulations,the computational efficiency is also investigated by comparing the SSPC,the fourth-order Lax-Wendroff correction(LWC)method,and the staggered-grid(SG)finite *** of synthetic waveforms computed by the SSPC and analytic solutions for acoustic and elastic models are given to illustrate the accuracy and the validity of the ***,several numerical experiments are conducted for the geological models including a 2-D homogeneous transversely isotropic(TI)medium,a two-layer elastic model,and the 2-D SEG/EAGE salt *** results show that the SSPC can be used as a practical tool for large-scale seismic simulation because of its effectiveness in suppressing numerical dispersion even in the situations such as coarse grids,strong interfaces,or high frequencies.

关键词： SSPC method seismic wavefield modeling anisotropy numerical dispersion shearwave splitting

An Adaptive Lasso Grey Model for Regional FDI Statistics Prediction

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Computers, Materials & Continua 2021年第11期69卷 2111-2121页

作者： Juan Huang Bifang Zhou Huajun Huang Jianjiang liu neal n.Xiong Centre for Innovation Research in Social Governance Changsha University of Science and TechnologyChangsha410114China College of Information Technology and Management Hunan University of Finance and EconomicsChangsha410205China Department of Mathematics and Computer Science Northeastern State UniversityTahlequah74464USA

To overcome the deficiency of traditional mathematical statistics methods,an adaptive Lasso grey model algorithm for regional FDI(foreign direct investment)prediction is proposed in this paper,and its validity is ***,the characteristics of the FDI data in six provinces of Central China are generalized,and the mixture model’s constituent variables of the Lasso grey problem as well as the grey model are ***,based on the influencing factors of regional FDI statistics(mean values of regional FDI and median values of regional FDI),an adaptive Lasso grey model algorithm for regional FDI was ***,an application test in Central China is taken as a case study to illustrate the feasibility of the adaptive Lasso grey model algorithm in regional FDI *** also select RMSE(root mean square error)and MAE(mean absolute error)to demonstrate the convergence and the validity of the ***,we train this proposedal gorithm according to the regional FDI statistical data in six provinces in Central China from 2006 to *** then use it to predict the regional FDI statistical data from 2019 to 2023 and show its changing *** extended work for the adaptive Lasso grey model algorithm and its procedure to other regional economic fields is also discussed.

关键词： Adaptive lasso grey model algorithm regional FDI statistics mean value of regional FDI median value of regional FDI

Effect of Dissolved Oxygen on Swimming Ability andPhysiological Response to Swimming Fatigue ofWhiteleg Shrimp （Litopenaeus vannamet3

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Journal of Ocean University of China 2014年第1期13卷 132-140页

作者： Yan Duan Xiumei Zhang Xuxu liu Dhanrajsingh n. Thakur The Key Laboratory of Mariculture of Chinese Ministry of Education Ocean University of China Qingdao P. R. China Liaoning Open Laboratory of Applied Marine Biotechnology Liaoning Ocean and Fisheries Science Research Institute Dalian P. R. China

The swimming endurance of whiteleg shrimp （Litopenaeus vannamei, 87.66 mm±0.25 mm, 7.73 g±0.06 g） was exam-ined at various concentrations of dissolved oxygen （DO, 1.9, 3.8, 6.8 and 13.6mgL-1） in a swimming channel against one of the fiveflow velocities （vb v2, v3, v4 and vs）. Metabolite contents in the plasma, hepatopancreas and pleopods muscle of the shrimp werequantified before and after swimming fatigue. The results revealed that the swimming speed and DO concentration were significantfactors that affected the swimming endurance ofL. vannamei. The relationship between swimming endurance and swimming speedat various DO concentrations can be described by the power model （vtb= a）. The relationship between DO concentration （mgL-l） e 9000and the swimming ability index （SAI）, defined as SAI= ∫9000vdt （cm）, can be described as SAI=27.947DO0.137 （R2=0.9312）. Thelevel of DO concentration directly affected the physiology of shrimp, and exposure to low concentrations of DO led to the increasesin lactate and energetic substrate content in the shrimp. In responding to the low DO concentration at 1.9 mg L-1 and the swimmingstress, L. vannamei exhibited a mix of aerobic and anaerobic metabolism to satisfy the energetic demand, mainly characterized by theutilization of total protein and glycogen and the production of lactate and glucose. Fatigue from swimming led to severe loss ofplasma triglyceride at Vl, v2, and v3 with 1.9mgL-1DO, and at V1 with 3.8, 6.8 and 13.6mgL-1 DO, whereas the plasma glucose con-tent increased significantly at v3, v4 and v5 with 3.8 and 6.8mgL-1 DO, and at v5 with 13.6mgL-1 DO. The plasma total protein andhepatopancreas glycogen were highly depleted in shrimp by swimming fatigue at various DO concentrations, whereas the plasmalactate accumulated at high levels after swimming fatigue at different velocities. These results were of particular value to under-standing the locomotory ability of whiteleg shrimp and its physiological changes, further contribut

关键词： dissolved oxygen glucose glycogen lactate total protein swimming endurance SAI

Recent Advances in Single-Cell Metabolomics Based on Mass Spectrometry

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CCS Chemistry 2023年第2期5卷 310-324页

作者： Qinlei liu Sandra Martínez-Jarquín Renato Zenobi Department of Chemistry and Applied Biosciences ETH ZurichCH-8093 Zurich

Cellular heterogeneity is essential for the physiological functions of organisms,and precise interpretation of the relevant biological mechanisms involved requires accurate measurement of biomolecules,including DnA,RnA,proteins,and metabolites at the single-cell *** metabolites react most rapidly to environmental and biochemical changes such that their detection is a critical step in determining the physiological state of ***,their limited amounts,structural diversity,and significant content variation render single-cell metabolomics analysis technically *** spectrometry,with its high sensitivity,good selectivity,and wide dynamic range,has been widely used in the single-cell analysis in recent *** terms of ionization techniques,there are four main types of single-cell mass spectrometry methods:nano-electrospray ionization mass spectrometry,matrix-assisted laser desorption/ionization mass spectrometry,secondary ion mass spectrometry,and dielectric barrier discharge ionization mass *** this mini review,the progress of single-cellmass spectrometrymethodologies and data processing strategies are summarized,and the future trends in single-cell mass spectrometry are outlined.

关键词： single-cell analysis metabolomics mass spectrometry ionization techniques analytical methods