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Design and investigation of dopingless double-gate line tunneling transistor: Analog performance, linearity, and harmonic distortion analysis

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Chinese Physics B 2020年第10期29卷 556-565页

作者： hui-fang xu Xin-Feng Han Wen Sun Institute of Electrical and Electronic Engineering Anhui Science and Technology UniversityFengyang 233100China

The tunnel field-effect transistor (TFET) is proposed by using the advantages of dopingless and line-tunneling technology. The line tunneling is created due to the fact that the gate electric field is aligned with the tunneling direction, which dramatically enhances tunneling area and tunneling current. Moreover, the effects of the structure parameters such as the length between top gate and source electrode, the length between top gate and drain electrode, the distance between bottom gate and drain electrode, and the metal position on the on-state current, electric field and energy band are investigated and optimized. In addition, analog/radio-frequency performance and linearity characteristics are studied. All results demonstrate that the proposed device not only enhances the on/of current ratio and reduces the subthreshold swing, but also offers eight times improvement in cut-off frequency and gain band product as compared with the conventional point tunneling dopingless TFET, at the same time;it shows better linearity and small distortions. This proposed device greatly enhances the potential of applications in dopingless TFET.

关键词： dopingless tunnel field effect transistor line tunneling lincarity parameters

Analysis of non-uniform hetero-gate-dielectric dual-material control gate TFET for suppressing ambipolar nature and improving radio-frequency performance

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Chinese Physics B 2019年第10期28卷 571-578页

作者： hui-fang xu Jian Cui Wen Sun Xin-Feng Han Institute of Electrical and Electronic Engineering Anhui Science and Technology University

A tunnel field-effect transistor(TFET) is proposed by combining various advantages together, such as non-uniform gate-oxide layer, hetero-gate-dielectric(HGD), and dual-material control-gate(DMCG) technology. The effects of the length of non-uniform gate-oxide layer and dual-material control-gate on the on-state, off-state, and ambipolar currents are investigated. In addition, radio-frequency performance is studied in terms of gain bandwidth product, cut-off frequency,transit time, and transconductance frequency product. Moreover, the length of non-uniform gate-oxide layer and dualmaterial control-gate are optimized to improve the on-off current ratio and radio-frequency performances as well as the suppression of ambipolar current. All results demonstrate that the proposed device not only suppresses ambipolar current but also improves radio-frequency performance compared with the conventional DMCG TFET, which makes the proposed device a better application prospect in the advanced integrated circuits.

关键词： non-uniform gate-oxide layer ambipolar current radio-frequency performances tunnel fieldeffect transistor

Superior compound coatings prepared by low-temperature vanadium-nitrocarburizing duplex treatment

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Rare Metals 2024年第4期43卷 1828-1835页

作者： Gen Jin fang-fang xu xun-xun Hu Yue xu School of Chemistry Beihang UniversityBeijing100191China Guobiao(Beijing)Testing and Certification Co. LtdBeijing100088China School of Materials Science and Engineering Beihang UniversityBeijing100191China

Superior compound coatings were prepared on CK45 steel surface by vanadium-nitrocarburizing duplex treatment in low-temperature salt *** this study,the microhardness,the phase constitution and the compositional distribution in the coatings prepared under different conditions were systematically *** results indicated that the reactions among activated vanadium,carbon and nitrogen atoms occurred on the steel surface,leading to the formation of compound coatings composed of outermost and compound *** mechanism for the formation of compound layer as well as the growth kinetics of the layer was also *** the duplex treatment,the wear and corrosion resistances of steel surface were significantly *** was found that the growth kinetics of compound layer obeyed the parabolic law,with the activation energy of 122.82 kJ·moL^(-1).

关键词： Vanadium-nitrocarburizing duplex treatment Compound coatings Microstructure Formation mechanism Growth kinetics

Growth,optical dispersion and magnetic behavior of Dy^(3+) doped yttrium iron garnet crystals

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Journal of Rare Earths 2024年第6期42卷 1110-1117,I0004页

作者： Yating fang hui Shen Yudie Ma Shijie Liao Shuang Xia Tian Tian Ding Zhou Yunfeng Ma Jiayue xu Institute of Crystal Growth School of Materials Science and EngineeringShanghai Institute of Technology National Engineering Center of Electromagnetic Radiation Control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of China

Y_(3)Fe_(5)O_(12)(YIG)crystals are highly desirable for the fabrication of mid-infrared isolators with the rapid growth of optical communications,although it is rather challenging to grow large size and high-quality single ***^(3+)doping is expected to improve the optical and magneto-optical prope ***,high quality Dy:YIG crystals and the adjustment of Dy^(3+)on the structure and optical behavior of YIG crystal remain unclear,impeding its practical ***,a series of Y_(3-x)Dy_(x)Fe_(5)O_(12)(x=0,0.5,1.0,1.5,3)solid solution crystals was grown by the flux-Bridgman method and single crystals up to 25 mm were *** the introduction of Dy^(3+),lattice parameters are gradually enlarged from 1.2379 nm(YIG)to 1.2420 nm(DyIG).Typical Dy^(3+)absorption peaks are observed around 1070,1265 and 1670 *** refractive index decreases from 2.37(500 nm)to 2.10(2500 nm)for YIG crystal,and it reduces from 2.47(500 nm)to 2.16(2500 nm)for DyIG *** optical bandgaps remain almost unchanged for Dy:YIG *** optical dispersion of the refractive indices was finely fitted by the Wemple and DiDomenico(WDD)and the Sellmeier models,*** the increase of Dy^(3+)content,the saturation magnetization(Ms)decreases significantly from 23.62 emu/g(YIG)to 5.33 emu/g(DyIG).Small coercive field is persisted for this system,endowing small external magnetic *** results provide valuable references for the manipulation of rare earths on the properties of magnetooptical crystals,which is beneficial to the design of high-performance garnet crystals for the application of optical switching and non-reciprocal related devices.

关键词： Magneto-optical crystal Yttrium iron garnet Dy^(3+)doping Crystal growth Optical dispersion Rare earths

Removal of rubidium from brine by an integrated film of sulfonated polysulfone/graphene/potassium copper ferricyanide

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Chinese Journal of Chemical Engineering 2024年第5期69卷 112-121页

作者： Huanxi xu Peihua Lin Pei-Jun Liu Hai-Gang Liu hui-Bin Guo Chao-Xiang Wu Ming fang xu Zhang Guan-Ping Jin Anhui Province Engineering Research Center of Flexible and Intelligent Materials School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China Chemical Design and Research Institute Co. LTD of Qinghai ProvinceQinghai Engineering and Technology Research Center of Fine ChemicalXining 810008China

A novel integrated film of sulfonated polysulfone/graphene/potassium copper ferricyanide(KCuFC/SPSG)was used for selectively extracting rubidium ion(Rb^(+))from *** form KCuFC/SPSG,the precursor film of sulfonated polysulfone/graphene(SPSG)was synthesized by phase conversion process,which was alternately immersed in 0.1 mol·L^(-1)CuSO_(4)/K_(4)[Fe(CN)_(6)]by in-situ adsorption coupled co-precipitation *** data such as nuclear magnetic resonance spectrometer,Fourier transform infrared spectroscope,X-ray photoelectron spectroscope,X-ray diffraction,scanning electron microscope,and energy dispersive spectroscopy all verified that abundant KCuFC were uniformly located on the *** resulting KCuFC/SPSG was used in film separation *** the solution was fed into the system,the Rb^(+)could be selectively adsorption by KCuFC/*** the saturation adsorption,0.5 mol·L^(-1)NH_(4)Cl/HCl was fed into the film cell,Rb^(+)could be quickly desorbed by ion-exchange between Rb^(+)and NH_(4)^(+)in the lattice of *** purpose of separating and recovering Rb^(+)from the brine can be achieved after the repeated *** effects of pH,adsorption time,and interferential ions on the adsorption capacity of Rb^(+)were investigated by batch *** adsorption behavior fits the pseudo-second order kinetic process,while KCuFC has a higher adsorption capacity(Langmuir maximum sorption 165.4 mg·g^(-1)).In addition,KCuFC/SPSG shows excellent selectivity for Rb^(+)even in complex brine ***/SPSG could maintain 93.5%extraction efficiency after five adsorption/desorption cycles.

关键词： Rubidium extraction Potassium copper ferricyanide Sulfonated polysulfone Graphene oxide Adsorption

Prevalence and associated factors of corneal blindness in Ningxia in northwest China

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International Journal of Ophthalmology(English edition) 2014年第3期7卷 557-562页

作者： xun-Lun Sheng hui-Ping Li Qing-Xia Liu Wei-Ning Rong Wen-Zhang Du Li Ma Guang-hui Yan Run-Qing Ma Jian-Ling Zhang hui-fang xu Wen-Qing Zou Xiao-Jun Bi Ningxia Eye Hospital Ningxia People's Hospital Department of Ophthalmology Tongxin Hospital Ningxia Hui Autonomous Region China Department of Ophthalmology Ningxia Medical University

AIM:To describe the prevalence and demographic characteristics of corneal blindness in an urban and rural region of Ningxia,located in the northwest part of ***:A stratified,randomized sampling procedure was employed in the study,including urban and rural area of all age *** acuity,anterior segment and ocular fundus were *** factor of corneal disease,including age,gender,education status,ethnic group,location and occupation,were identified according to uniform customized *** eye was defined to be corneal blindness if the visual acuity was<20/400 due to a corneal ***:Three thousand individuals(1290 from urban area and 1710 from rural area)participated in the investigation,with a response rate of 80.380%.The prevalence of corneal blindness was 0.023%in both eyes and 0.733%in at least one *** blindness in at least one eye with varied causes was present in 106participants(3.533%)and in bilateral eyes in 34participants(1.133%).The corneal diseases accounted for 20.754%of blindness in at least one eye and 20.588%of bilateral *** prevalence of corneal disease was higher in older and Han ethnic group,especially those who occupied in agriculture and outdoor *** with corneal blindness were more likely to be older and lower *** population were more likely to suffer from bilateral corneal blindness than the urban population in≥59-year group(χ2=6.716,P=0.019).Infectious,trauma and immune corneal disease were the three leading causes of corneal *** cornealdisease was more likely leading to blindness in one ***,infectious and immune corneal diseases make more contribution to the bilateral corneal ***:Corneal blindness is a significant burden of in Ningxia population,encompassing a variety of corneal infections and trauma;the majority of those were *** promotion strategies and good hygienic conditions have to be developed.

关键词： corneal disease epidemiology blindness infectious keratitis trauma

Design of high frequency broadband low insertion loss SAW filter at 3.5 GHz

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The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 55-61页

作者： Wang Wei Zhang Ying Wang fang Wu Hao Ding hui Xia xu Wang Guanyu Xie Yingtao School of Optoelectronics Engineering/International Semiconductor College Chongqing University of Posts and TelecommunicationsChongqing 400065China

With the wide application of the fifth-generation mobile communication system(5G)technology,wireless communication equipment tends to develop in miniaturization,high frequency,and low *** this paper,a surface acoustic wave(SAW)filter with a center frequency of 3.5 GHz was ***,the acoustic waveguide structure of the longitudinal leaky SAW(LLSAW)excitation is determined,and the two-dimensional(2D)theoretical model of the device is established by COMSOL ***,the influence of electrode parameters on the performance of the device is studied,and the electrode parameters are optimized on this *** setting the device structure parameters reasonably,the spurious in the passband can be effectively ***,the center frequency of the mirror T-structure LLSAW filter is 3.536 GHz,the insertion loss is-1.414 dB,the bandwidth of-3 dB is 276 MHz,and the out-of-band rejection is greater than-30 dB.

关键词： surface acoustic wave(SAW) electrode spurious response mirror T-structure

Dynamic interwell connectivity analysis of multi-layer waterflooding reservoirs based on an improved graph neural network

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Petroleum Science 2024年第2期21卷 1062-1080页

作者： Zhao-Qin Huang Zhao-xu Wang hui-fang Hu Shi-Ming Zhang Yong-Xing Liang Qi Guo Jun Yao School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Exploration and Development Research Institute Shengli OilfieldSINOPECDongying257015ShandongChina

The analysis of interwell connectivity plays an important role in the formulation of oilfield development plans and the description of residual oil distribution. In fact, sandstone reservoirs in China's onshore oilfields generally have the characteristics of thin and many layers, so multi-layer joint production is usually adopted. It remains a challenge to ensure the accuracy of splitting and dynamic connectivity in each layer of the injection-production wells with limited field data. The three-dimensional well pattern of multi-layer reservoir and the relationship between injection-production wells can be equivalent to a directional heterogeneous graph. In this paper, an improved graph neural network is proposed to construct an interacting process mimics the real interwell flow regularity. In detail, this method is used to split injection and production rates by combining permeability, porosity and effective thickness, and to invert the dynamic connectivity in each layer of the injection-production wells by attention *** on the material balance and physical information, the overall connectivity from the injection wells,through the water injection layers to the production layers and the output of final production wells is established. Meanwhile, the change of well pattern caused by perforation, plugging and switching of wells at different times is achieved by updated graph structure in spatial and temporal ways. The effectiveness of the method is verified by a combination of reservoir numerical simulation examples and field example. The method corresponds to the actual situation of the reservoir, has wide adaptability and low cost, has good practical value, and provides a reference for adjusting the injection-production relationship of the reservoir and the development of the remaining oil.

关键词： Graph neural network Dynamic interwell connectivity Production-injection splitting Attention mechanism Multi-layer reservoir

Bibliometric analysis of hotspots and trends of global myopia research

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International Journal of Ophthalmology(English edition) 2024年第5期17卷 940-950页

作者： Xing-Yang Wu hui-hui fang Yan-Wu xu Yan-Ling Zhang Shao-Chong Zhang Wei-Hua Yang Shenzhen Eye Institute Shenzhen Eye HospitalJinan UniversityShenzhen 518040Guangdong ProvinceChina School of Future Technology South China University of TechnologyGuangzhou 510641Guangdong ProvinceChina

AIM:To gain insights into the global research hotspots and trends of ***:Articles were downloaded from January 1,2013 to December 31,2022 from the Science Core Database website and were mainly statistically analyzed by bibliometrics ***:A total of 444 institutions in 87 countries published 4124 *** 2013 and 2022,China had the highest number of publications(n=1865)and the highest H-index(61).Sun Yat-sen University had the highest number of publications(n=229)and the highest H-index(33).Ophthalmology is the main category in related *** from 2020 to 2022 highlight keywords of options and reference,child health(pediatrics),myopic traction mechanism,public health,and machine learning,which represent research ***:Myopia has become a hot research *** and Chinese institutions have the strongest academic influence in the field from 2013 to *** main driver of myopic research is still medical or *** study highlights the importance of public health in addressing the global rise in myopia,especially its impact on children’s *** present,a unified theoretical system is still *** surgical and therapeutic solutions must be proposed for people with different characteristics to manage and intervene refractive *** addition,the benefits of artificial intelligence(AI)models are also reflected in disease monitoring and prediction.

关键词： bibliometric analysis myopia global trends