检索结果-南通市图书馆

Si掺杂对Ga_(2)O_(3)/BP异质结光电性能调控的第一性原理研究

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第4期42卷 131-137页

作者：李佳宏郝增瑞薛瑞鑫阚红梅关玉琴内蒙古工业大学理学院呼和浩特010010

近年来,氧化镓(Ga_(2)O_(3))是新一代超宽禁带(4.9 eV)半导体,基于优越的热稳定和化学稳定性、高击穿场强和可见光透过率等优点,在日盲紫外探测器和透明光电器件领域中引起了广泛的关注.但是,Ga_(2)O_(3)基光电器件存在迁移率较低而限... 详细信息

近年来,氧化镓(Ga_(2)O_(3))是新一代超宽禁带(4.9 eV)半导体,基于优越的热稳定和化学稳定性、高击穿场强和可见光透过率等优点,在日盲紫外探测器和透明光电器件领域中引起了广泛的关注.但是,Ga_(2)O_(3)基光电器件存在迁移率较低而限制其应用的现象,而构建合适的Ga_(2)O_(3)异质结是改善光电探测器的光电性能的有效手段之一.基于第一性原理构建β-Ga_(2)O_(3)/BP异质结模型,研究了氧空位(Vo)和Si掺杂对β-Ga_(2)O_(3)/BP异质结光电性质的调控以及相关机理.结果显示:β-Ga_(2)O_(3)/BP异质结结构有效降低β-Ga_(2)O_(3)功函数,提高灵敏度,Si掺杂降低结合能,增强稳定性;β-Ga_(2)O_(3)/BP异质结有效减小带隙,Si掺杂以及氧空位的存在,进一步减小带隙,增强光导电性,并且Si掺杂引起了光电导各向异性.此结果对改善Ga_(2)O_(3)基异质结光电性能提供理论参考.

关键词： β-Ga_(2)O_(3)/BP异质结缺陷光电性质第一性原理

Adaptive Sliding-Mode Control of an Automotive Electronic Throttle in the Presence of Input Saturation Constraint

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2018年第4期5卷 878-884页

作者： rui Bai School of Electrical Engineering Liaoning University of TechnologyJinzhou 121001China

In modern vehicles, electronic throttle(ET) has been widely utilized to control the airflow into gasoline engine. To solve the control difficulties with an ET, such as strong nonlinearity,unknown model parameters and input saturation constraints,an adaptive sliding-mode tracking control strategy for an ET is presented. Compared with the existing control strategies for an ET, input saturation constraints and parameter uncertainties are adequately considered in the proposed control strategy. At first, the nonlinear dynamic model for control of an ET is described. According to the dynamical model, the nonlinear adaptive sliding-mode tracking control method is presented,where parameter adaptive laws and auxiliary design system are employed. Parameter adaptive law is given to estimate the unknown parameter with an ET. An auxiliary system is designed,and its state is utilized in the tracking control method to handle the input saturation. Stability proof and analysis of the adaptive sliding-mode control method is performed by using Lyapunov stability theory. Finally, the reliability and feasibility of the proposed control strategy are evaluated by computer *** research shows that the proposed sliding-mode control strategy can provide good control performance for an ET.

关键词： Auxiliary design system electronic throttle(ET) input saturation parameter adaptive law sliding-mode control tracking control

Review on the study of metallurgical process engineering

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1253-1263页

作者： rui-yu Yin Central Iron and Steel Research Institute Beijing 100081China

After nearly one hundred years of research, metallurgy(metallurgical science and engineering) has gradually become a system with three levels of knowledge:(1) micro metallurgy at the atomic/molecular scale,(2) process metallurgy at the procedure/device, and(3) macrodynamic metallurgy at the full process/process group. Macro-dynamic metallurgy development must eliminate the concept of an "isolated system" and establish concepts of "flow," "process network," and "operating program" to study the "structure–function–efficiency" in the macrodynamic operation of metallurgical manufacturing processes. It means considering "flow" as the ontology and observing dynamic change by"flow" to solve the green and intelligent potential of metallurgical enterprises. Metallurgical process engineering is integrated metallurgy, toplevel designed metallurgy, macro-dynamic operated metallurgy, and engineering science level metallurgy. Metallurgical process engineering is a cross-level, comprehensive, and integrated study of the macro-dynamic operation of manufacturing processes. Metallurgical process engineering studies the physical nature and constitutive characteristics of the dynamic operation of steel manufacturing process, as well as the analysis-optimization of the set of procedure functions, coordination-optimization of the set of procedures' relations, and reconstruction-optimization of the set of procedures in the manufacturing process. The study establishes rules for the macro operation of the manufacturing process, as well as dynamic and precise objectives of engineering design and production operation.

关键词： metallurgical process engineering cross-level comprehensive integration macro-dynamic operation new branch of metallurgy

在线全文

学校读者我要写书评

暂无评论

运动干预与细胞焦亡在骨关节炎中的作用

中国组织工程研究 2025年第8期29卷 1667-1675页

作者：王秋月靳攀蒲锐长江大学教育与体育学院湖北省荆州市434023 长江大学医学部湖北省荆州市434023 长江大学运动人体科学实验室湖北省荆州市434023

背景:细胞焦亡参与软骨细胞外基质降解、滑膜炎症以及疼痛,在骨关节炎防治中发挥重要作用。此外,运动可通过抑制细胞焦亡调控骨关节炎的发生,已成为防治骨关节炎的研究热点。目的:总结细胞焦亡在骨关节炎中的调控作用,以及运动介导细胞... 详细信息

背景:细胞焦亡参与软骨细胞外基质降解、滑膜炎症以及疼痛,在骨关节炎防治中发挥重要作用。此外,运动可通过抑制细胞焦亡调控骨关节炎的发生,已成为防治骨关节炎的研究热点。目的:总结细胞焦亡在骨关节炎中的调控作用,以及运动介导细胞焦亡在改善骨关节炎中的机制。方法:以“pyroptosis,osteoarthritis,chondrocyte pyroptosis,synovial cell pyroptosis,exercise”和“细胞焦亡,骨关节炎,软骨细胞焦亡,滑膜细胞焦亡,运动”为关键词,检索PubMed与中国知网数据库1992-2024年间发表的相关文献,根据纳入及排除标准选择71篇文献进行综述。结果与结论:①骨关节炎是以软骨细胞外基质降解、滑膜炎症和软骨下骨重塑等为特点的慢性退行性关节疾病,易引起骨的器质性病变、疼痛并引发功能障碍。②细胞焦亡作为一种特殊的程序性死亡机制,其特征为细胞裂解死亡释放炎症因子引发强烈的炎症反应,与骨关节炎的发生发展关系密切。细胞焦亡可导致大量炎症因子释放,进而激活核因子κB转录,增加焦亡蛋白的产生,进而加剧骨关节炎的发生发展,因此细胞焦亡可作为骨关节炎防治的新方向。③运动可通过下调焦亡蛋白信号通路和抑制相关炎症因子表达等途径抑制软骨细胞和滑膜细胞的焦亡,从而在骨关节炎防治中发挥重要作用。有氧和无氧运动可通过抑制细胞焦亡的发生延缓骨关节炎的病理进程,中等强度的有氧运动通过抑制细胞焦亡信号通路改善骨关节炎的效果较好,无氧运动可通过提高肌肉质量进而对骨关节炎产生有益效应。

关键词：细胞焦亡骨关节炎运动运动调控信号通路综述

An explanation about the flat radio spectrum for Mrk 421

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第4期21卷 311-318页

作者： rui Xue Ze-rui wang Department of Physics Zhejiang Normal UniversityJinhua 321004China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China

It is well known that a flat radio spectrum is a common property in the spectral energy distribution of *** one-zone leptonic models are generally successful in explaining the multi-wave band emission,they are problematic in reproducing the radio *** the study of Mrk 421,one-zone models suggest that in order to avoid overproducing the radio flux,the minimum electron Lorentz factor should be larger than a few hundred at least,even considering the synchrotron self-absorption *** result suggests that the model predicted spectral index in the radio band of Mrk 421 should be-1/*** the basis of this result,by assuming there is a neglected region that will also contribute the radio emission and its electron energy index naturally originates from the simplest first-order Fermi acceleration mechanism,we can get a superimposed flat radio *** this paper,a two-zone model is proposed to reproduce the quiescent state spectral energy distribution of Mrk *** addition to taking into account the emission from a conventional radiation zone,we further consider emission from the acceleration zone in which particles are accelerated at a shock *** the present model,our fitting result suggests that the low frequency flat radio spectrum of Mrk 421 might be explained as a superposition of the synchrotron emission from acceleration zone and radiation zone.

关键词： galaxies:active galaxies:jets radiation mechanisms:non-thermal

Hadronuclear interpretation of the possible neutrino emission from PKS B1424-418,GB6 J1040+0617 and PKS 1502+106

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第12期21卷 375-382页

作者： Ze-rui wang rui Xue College of Physics and Electronic Engineering Qilu Normal UniversityJinhua 321004China Department of Physics Zhejiang Normal UniversityJinan 250200China

In addition to neutrino event IceCube-170922 A which is observed to be associated with aγ-ray flare from blazar TXS 0506+056,there are also several neutrino events that may be associated with *** them,PKS B1424-418,GB6 J1040+0617 and PKS 1502+106 are low synchrotron peaked sources,which are usually believed to have the broad line region in the vicinity of the central black *** are considered as counterparts of IceCube event 35,IceCube-141209 A and IceCube-190730 A,*** considering the proton-proton(pp)interactions between the dense gas clouds in the broad line region and the relativistic protons in the jet,we show that the pp model that is applied in this work can not only reproduce the multi-waveband spectral energy distribution but also suggest a considerable annual neutrino detection *** also discuss the emission from the photopion production and Bethe-Heitler pair production with a sub-Eddington jet power that is suggested in our model and find that it has little effect on the spectrum of total emission for all of three sources.

关键词： neutrinos galaxies:active galaxies:jets radiation mechanisms:non-thermal

Review of resistive switching mechanisms for memristive neuromorphic devices

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第9期29卷 1-14页

作者： rui Yang State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Memristive devices have attracted intensive attention in developing hardware neuromorphic computing systems with high energy efficiency due to their simple structure,low power consumption,and rich switching dynamics resembling biological synapses and neurons in the last *** demonstrations have been achieved in memristive synapses neurons and neural networks in the last few *** dynamics are involved in the data processing and storage in biological neurons and synapses,which ask for carefully tuning the switching dynamics of the memristive *** that switching dynamics of the memristive devices are closely related to switching ***,from the perspective of switching dynamics modulations,the mainstream switching mechanisms including redox reaction with ion migration and electronic effect have been systemically *** approaches to tune the switching dynamics in the devices with different mechanisms have been ***,some other mechanisms involved in neuromorphic computing are briefly introduced.

关键词： memristive devices resistive switching mechanisms neuromorphic computing

Magnetic flux ropes in the solar corona: structure and evolution toward eruption

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2020年第10期20卷 287-328页

作者： rui Liu CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Hefei 230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaMengcheng 233500China

Magnetic flux ropes are characterized by coherently twisted magnetic field lines,which are ubiquitous in magnetized *** the core structure of various eruptive phenomena in the solar atmosphere,flux ropes hold the key to understanding the physical mechanisms of solar eruptions,which impact the heliosphere and planetary *** strongest disturbances in the Earth’s space environments are often associated with large-scale flux ropes from the Sun colliding with the Earth’s magnetosphere,leading to adverse,sometimes catastrophic,space-weather ***,it remains elusive as to how a flux rope forms and evolves toward eruption,and how it is structured and embedded in the ambient *** present paper addresses these important questions by reviewing current understandings of coronal flux ropes from an observer’s perspective,with an emphasis on their structures and nascent evolution toward solar eruptions,as achieved by combining observations of both remote sensing and in-situ detection with modeling and *** paper highlights an initiation mechanism for coronal mass ejections(CMEs)in which plasmoids in current sheets coalesce into a’seed’flux rope whose subsequent evolution into a CME is consistent with the standard model,thereby bridging the gap between microscale and macroscale dynamics.

关键词： magnetic fields magnetic reconnection Sun:magnetic fields Sun:corona Sun:coronal mass ejections(CMEs) Sun:flares Sun:filaments,prominences

The structural order of protein hydration water

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第9期74卷 170-176页

作者： rui Shi Zhejiang Province Key Laboratory of Quantum Technology and Device School of PhysicsZhejiang UniversityHangzhou 310027China

The ability of water to dissolve biomolecules is crucial for our *** has been shown that protein has a profound effect on the behavior of water in its hydration shell,which in turn affects the structure and function of the ***,there is still no consensus on whether protein promotes or destroys the structural order of water in its hydration shell until today,because of the lack of proper structural descriptor incorporating hydrogen-bond(H-bond)information for water at the protein/water *** we performed all-atom molecular dynamics simulations of lysozyme protein in water and analyzed the H-bond structure of protein hydration water by using a newly developed structural *** find that the protein promotes local structural ordering of the hydration water while having a negligible effect on the strength of individual *** findings are fundamental to the structure and function of biomolecules and provide new insights into the hydration of protein in water.

关键词： protein hydration water structure hydrogen bond molecular dynamics