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Growth of large scale PtTe,PtTe_(2) and PtSe_(2) films on a wide range of substrates

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Nano Research 2021年第6期14卷 1663-1667页

作者： Kenan zhang Meng Wang Xue Zhou Yuan Wang Shengchun Shen Ke Deng Huining Peng Jiaheng Li Xubo Lai liuwan zhang Yang Wu Wenhui Duan Pu Yu Shuyun Zhou State key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing100084China Department of Mechanical Engineering and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing100084China Collaborative Innovation Center of Quantum Matter Beijing100084China

1T phase of transition metal dichalcogenides(TMDCs)formed by group 10 transition metals(e.g.Pt,Pd)have attracted increasing interests due to their novel properties and potential device applications.Synthesis of large scale thin films with controlled phase is critical especially considering that these materials have relatively strong interlayer interaction and are difficult to exfoliate.Here we report the growth of centimeter-scale PtTe,1T-PtTe2 and 1T-PtSe2 films via direct deposition of Pt metals followed by tellurization or selenization.We find that by controlling the Te flux,a hitherto-unexplored PtTe phase can also be obtained,which can be further tuned into PtTe2 by high temperature annealing under Te flux.These films with different thickness can be grown on a wide range of substrates,including NaCl which can be further dissolved to obtain free-standing PtTe2 or PtSe2 films.Moreover,a systematic thickness dependent resistivity and Hall conductivity measurements show that distinguished from the semiconducting PtSe2 with hole carriers,PtTe2 and PtTe films are metallic.Our work opens new opportunities for investigating the physical properties and potential applications of group 10 TMDC films and the new monochalcogenide PtTe film.

关键词： transition metal dichalcogenides(TMDCs) selenization tellurization PtSe2 PtTe2 PtTe

Fabrication of large area hexagonal boron nitride thin films for bendable capacitors

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Nano Research 2013年第8期6卷 602-610页

作者： Ning Guo Jinquan Wei Yi Jia Huanhuan Sun Yuhang Wang Kehan Zhao Xiaolan Shi liuwan zhang Xinming Li Anyuan Cao Hongwei Zhu Kunlin Wang Dehai Wu Key Lab for Advanced Materials Processing Technology of Education Ministry School of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Physics Tsinghua University Beijing 100084 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

高度可靠、可弯曲的电介质为未来应用在灵活或可弯曲的电子设备被需要。六角形的硼氮化物(h-BN ) 能由于它的宽乐队差距被用作可弯曲的电介质。这里，我们由一个低压力化学药品蒸汽免职方法与可控制的厚度制作高质量的 h-BN 电影。我们... 详细信息

高度可靠、可弯曲的电介质为未来应用在灵活或可弯曲的电子设备被需要。六角形的硼氮化物(h-BN ) 能由于它的宽乐队差距被用作可弯曲的电介质。这里，我们由一个低压力化学药品蒸汽免职方法与可控制的厚度制作高质量的 h-BN 电影。我们作为电介质用 h-BN 电影表明一个平行板的电容器。h-BN 电容器与 9.0 MV/cm 的高故障地力量是可靠的。越过 h-BN 电影的通道电流对电介质的厚度相反地指数，它让电容显著地落下。h-BN 电容器显示出 6.8 F/cm2 的一个最好的特定的电容，它比计算的值高一个数量级。

关键词：平行板电容器六方氮化硼可弯曲氮化硼薄膜制造化学气相沉积法面积 BN薄膜

Dielectric properties of spinel ceramic Fe_(1.8)V_(1.2)O_4

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Chinese Science Bulletin 2012年第36期57卷 4707-4711页

作者： LIU Na WANG YuHang zhang liuwan Laboratory of Advanced Materials State Key Laboratory of Low-Dimensional Quantum PhysicsDepartment of PhysicsTsinghua UniversityBeijing 100084China

Spinel vanadates possess rich physics arising from the interaction among spin,orbital and lattice degrees of freedom.We report the dielectric properties of polycrystalline Fe1.8V1.2O4.A thermally activated dielectric relaxation appeared in low temperature due to the inhomogeneous conductivity between grains and grain boundaries.We found an artificial ferroelecticity in this sample.An abnormal frequency-independent dielectric peak appeared at room temperature when the samples were measured during warming in ambient air.However,this peak disappeared in the following cooling process.By dielectric frequency spectrum and equivalent circuit analysis in detail,we found the sample had a surface layer in warming but not in cooling process.We also confirmed that this surface layer was induced by the adsorption of water,which is responsible for the dielectric peak.

关键词：介电性能尖晶石型陶瓷冷却过程相互作用晶粒边界介电弛豫等效电路

H_∞ Optimal Model Reduction for Singular Fast Subsystems

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自动化学报 2005年第4期31卷 638-641页

作者： WANGJing zhangQing-Ling liuwan-Quan ZHOUYue CollegeofSciences NortheasternUniversityShenyang110004 SchoolofComputing CurtinUniversityofTechnologyAustraliaWA6102 CollegeofInformationSciencesandEngineering ShenyangUniversityofTechnologyShenyang110004

In this paper, H∞ optimal model reduction for singular fast subsystems will be inves-tigated. First, error system is established to measure the error magnitude between the original andreduced systems, and it is demonstrated that the new feature for model reduction of singular systemsis to make H∞ norm of the error system finite and minimal. The necessary and su?cient conditionis derived for the existence of the H∞ suboptimal model reduction problem. Next, we give an exactand practicable algorithm to get the parameters of the reduced subsystems by applying the matrixtheory. Meanwhile, the reduced system may be also impulsive. The advantages of the proposedalgorithm are that it is more ?exible in a straight-forward way without much extra computation, andthe order of the reduced systems is as minimal as possible. Finally, one illustrative example is givento illustrate the e?ectiveness of the proposed model reduction approach.

关键词： for Model Fast systems model matrix the First and fast norm mini Next more The is to new get may are one be it

Evolution of resistive switching polarity in Au/Ar^+ bombarded SrTi_(0.993)Nb_(0.007)O_3/In sandwiches

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Chinese Science Bulletin 2012年第1期57卷 20-24页

作者： XIE GuanLin WANG YuHang REN TianLing ZHU JiaLin SUN JiaLin zhang liuwan Laboratory of Advanced Materials State Key Laboratory of Low-Dimensional Quantum PhysicsDepartment of PhysicsTsinghua UniversityBeijing 100084China Institute of Microelectronics Tsinghua UniversityBeijing 100084China

We investigated the resistive switching characteristics of Au/Ar+bombarded SrTi 0.993 Nb0.007O3/In sandwiches.The evolution of the resistive switching polarity with sweeping voltage was observed.Our experiments showed that under a macroscopic electrode the homogeneous trapping-detrapping-type conduction and filament-type conduction coexist and compete with each other.For a large sweeping voltage range,the trapping-detrapping-type conduction dominates.However,for a small range the latter dominates. If the bias voltage is too large,the filament conduction could be destroyed.These results will help deepen the understanding of the resistive switching polarity,and will aid in future device design.

关键词：开关特性三明治电阻极性 AR 演变轰炸金

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水文地质灾害防治对煤矿安全管理的重要性

当代化工研究 2024年第11期 101-103页

作者：张鹏基山西汾西矿业(集团)有限责任公司柳湾煤矿山西032303

随着社会和煤炭工业的快速发展,煤矿生产的安全性问题日益引起人们的关注。本文详细阐述了矿井水文地质工作的主要任务,分析了矿井地质防治水工作中面临的挑战,并提出煤矿地测防治水工作的优化措施,旨在为矿井管理者提供科学的防治策略... 详细信息

随着社会和煤炭工业的快速发展,煤矿生产的安全性问题日益引起人们的关注。本文详细阐述了矿井水文地质工作的主要任务,分析了矿井地质防治水工作中面临的挑战,并提出煤矿地测防治水工作的优化措施,旨在为矿井管理者提供科学的防治策略和技术支持,以强化矿井安全生产管理。

关键词：地测防治水煤矿安全管理

广西国有六万林场桉树高产林营造技术与管理措施

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南方农业 2024年第6期18卷 221-223页

作者：张天贵广西壮族自治区国有六万林场广西玉林537000

桉树是广西建设国家储备林的主要树种,研究桉树高产林营造技术与管理措施,有助于提升广西国家储备林建设水平,保障国家木材安全。基于此,以广西国有六万林场为研究对象,从林地选择、林地清理、挖坎、施足基肥、苗木准备及苗木栽植等方... 详细信息

桉树是广西建设国家储备林的主要树种,研究桉树高产林营造技术与管理措施,有助于提升广西国家储备林建设水平,保障国家木材安全。基于此,以广西国有六万林场为研究对象,从林地选择、林地清理、挖坎、施足基肥、苗木准备及苗木栽植等方面总结出一套科学有效的桉树高产林营造技术,并归纳了及时除草、带垦松土和合理追肥等桉树高产林管理措施。

关键词：桉树高产林营造技术管理措施广西国有六万林场

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建设一流实验物理教学中心的探讨

实验技术与管理 2012年第4期29卷 3-7页

作者：葛惟昆张留碗清华大学实验物理教学中心

从"国际一流"的理念和目标出发,围绕"建设实验教学的研究基地"、"实验教学的两大支柱——教师队伍和实验技术队伍"、"科研与教学紧密结合——从教师队伍到课题建设",以及"实验教学的两大层次——经典物理与近代物理"4个重要侧面,探讨高... 详细信息

从"国际一流"的理念和目标出发,围绕"建设实验教学的研究基地"、"实验教学的两大支柱——教师队伍和实验技术队伍"、"科研与教学紧密结合——从教师队伍到课题建设",以及"实验教学的两大层次——经典物理与近代物理"4个重要侧面,探讨高等学校实验物理教学的改革和创新。

关键词：实验物理一流教学实验室创新型人才

三相电压型整流器DSP控制的实现及程序模块化应用

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常州工学院学报 2014年第5期27卷 31-36页

作者：张留宛常州工程职业技术学院江苏常州213164

三相电压型整流器是当今非常热门的变换器拓扑之一,它功率因数高,谐波畸变小,拓扑结构简单,输出功率可以从几千瓦到兆瓦级。文章以程序算法为核心,实现了对整流器的DSP控制,分析了其应用程序的框架结构,并在此基础上提出了控制程序的模... 详细信息

三相电压型整流器是当今非常热门的变换器拓扑之一,它功率因数高,谐波畸变小,拓扑结构简单,输出功率可以从几千瓦到兆瓦级。文章以程序算法为核心,实现了对整流器的DSP控制,分析了其应用程序的框架结构,并在此基础上提出了控制程序的模块化方法,增强了程序可读性,减少了代码长度,降低了维护成本。同时利用PLECS仿真软件对DSP程序进行了仿真,验证了其正确性。

关键词：三相电压型整流器 DSP控制模块化