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Compensation of Zn substitution and secondary phase controls effective mass and weighted mobility in In and Ga co-doped ZnO material

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Journal of Materiomics 2021年第4期7卷 742-755页

作者： Oanh kieu Truong Le Anh Tuan Thanh Pham Ngoc Kim Pham Trang Huyen Cao Pham Truong Huu Nguyen Dung Van Hoang hanh kieu thi ta Dai Cao Truong Hoa thi Lai Thuy Dieu thi Ung Vinh Cao Tran Thang Bach Phan aboratory of Advanced Materials University of ScienceHoChiMinh City700000Viet Nam Vietnam National University HoChiMinh City700000Viet Nam Faculty of Physics and Engineering Physics University of ScienceHoChiMinh City700000Viet Nam Faculty of Materials Science and Technology University of ScienceHoChiMinh City700000Viet Nam Center for Innovative Materials and Architectures(INOMAR) HoChiMinh CityViet Nam Institute of Materials Science Vietnam Academy of Science and TechnologyHanoi100000Viet Nam

Conductivity s and thermal conductivity k are directly related to carrier concentration while Seebeck coefficient S is inversely proportional to carrier ***,improving thermoelectric(TE)performance is ***,the first-time analysis of secondary phase-controlled TE performance in terms of density-of-state effective mass m*d,weighted mobility mw and quality factor B is discussed in ZnO *** results show that the secondary spinel phase Ga2O_(3)(ZnO)9 not only impacts on k but also on s and S at high temperature,while the effect of carrier concentration seem to be dominant at low *** the high-spinel-segregation sample,a compensation of dopant atoms from the spinel to substitutional sites in the ZnO matrix at high temperature leads to a low decreased rate of temperaturedependent m**** compensation process also induces a band sharpening,a small mw reduction,and a large B *** a result,In and Ga co-doped ZnO bulk with the highest spinel segregation achieves the greatest PF improvement by 112.8%,owing to enhanced Seebeck coefficient by 110%as compared to the good Zn-substitution sample.

关键词： Thermoelectrics In and Ga co-Doped ZnO Secondary phase Zn substitution DOS effective Mass Weighted mobility

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Surface Mapping of Resistive Switching CrO_x thin Films

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Advances in Materials Physics and Chemistry 2016年第3期6卷 21-27页

作者： Kim Ngoc Pham kieu hanh thi ta Lien Thuong thi Nguyen Vinh Cao Tran Bach Thang Phan Faculty of Materials Science University of Science Vietnam National University Ho Chi Minh City Vietnam Faculty of Resources and Environment Thu Dau Mot University Binh Duong City Vietnam Laboratory of Advanced Materials University of Science Vietnam National University Ho Chi Minh City Vietnam

In this work, we investigated resistive switching behavior of CrOx thin films grown by using sputtering technique. Conventional I-V measurements obtained from Ag/CrOx/Pt/Ti/SiO2/Si structures depict the bipolar switching behavior, which is controlled by formation/dissolution processes of Ag conducting filaments through electrochemical redox reaction under external electric field driven. Conductive atomic force microscopy (C-AFM) technique provides the valuable mapping images of existing Ag filaments at low resistance state as well as the characteristics of filament distributions and diameters. this study also reveals that where the higher amplitude of topography is, the easier possibility of forming conducting filament paths is on CrOx surface films.

关键词： Resistive Switching Chromium Oxide C-AFM Surface Mapping Metal Filament

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汉越惯用语对比研究

汉越惯用语对比研究

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作者：潘乔幸（PHAN kieu hanh）华东师范大学

学位级别：硕士

惯用语是人们日常生活中的习惯用语,多用于口语,有固定的结构。惯用语的内容丰富多彩,是人民群众在生活与劳动中创造的,具有通俗、平易的特点。因此,汉越惯用语所表达的内容既贴近老百姓的生活,又具有汉越民族的思维、心理等深刻的文化... 详细信息

惯用语是人们日常生活中的习惯用语,多用于口语,有固定的结构。惯用语的内容丰富多彩,是人民群众在生活与劳动中创造的,具有通俗、平易的特点。因此,汉越惯用语所表达的内容既贴近老百姓的生活,又具有汉越民族的思维、心理等深刻的文化内涵。本文以汉越语言中的惯用语作为研究对象,在前人研究的基础上,运用对比分析法和统计法对汉越惯用语进行研究,同时通过语义的认知分析探究汉越民族的文化和心理上的差异及其原因。本文首先通过梳理各语言学者对惯用语提出的观点,总结出惯用语的界定及特点。对越南语惯用语做出明确的概念界定,从而比较汉越惯用语概念特点的差异。其次,本文比较了汉越惯用语的基本特点,主要从它的结构特点、句法功能与语义特征三个方面开展讨论,发现汉越惯用语的基本特点在音节构成方式、语法结构特点有较大的区别。此外,从认知语言学作为研究的理论基础上,我们比较了汉越惯用语体现的文化内涵,主要从动物形象、饮食与社会现象相关等内容进行探究。由于汉越惯用语主要取材于日常生活中的各种事物、现象、活动等,与人们的日常生活有密不可分的关系。因此,汉越惯用语的背后既反映人们的生活方式,又反映了劳动者的思维方式和价值观念等方面。我们通过汉越惯用语中体现的文化内涵的差异,试图揭示产生差异的因素。

关键词：汉语越南语惯用语对比

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Ecoregional variations of aboveground biomass and stand structure in evergreen broadleaved forests

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Journal of Forestry Research 2020年第5期31卷 1713-1722页

作者： Tran Van Do Mamoru Yamamoto Osamu Kozan Vo Dai Hai Phung Dinh Trung Nguyen Toan Thang Lai Thanh Hai Vu Thanh Nam Trieu Thai Hung Hoang Van Thang Tran Duc Manh Cao Chi Khiem Vu Tien Lam Nguyen Quang Hung Tran Hoang Quy Pham Quang Tuyen Trinh Ngoc Bon Nguyen thi Thu Phuong Ninh Viet Khuong Nguyen Van Tuan Dang thi Hai Ha Tran Hai Long Dang Van Thuyet Dang thinh Trieu Nguyen Van thinh Tran Anh Hai Duong Quang Trung Nguyen Van Bich Dinh Hai Dang Pham Tien Dung Nguyen Huy Hoang Le thi hanh Phan Minh Quang Nguyen thi Thuy Huong Hoang Thanh Son Nguyen Thanh Son Nguyen thi Van Anh Nguyen thi Hoai Anh Pham Dinh Sam Hoang thi Nhung Hoang Van Thanh Nguyen Huu thinh Tran Hong Van Ho Trung Luong Bui kieu Hung Research Institute for Sustainable Humanosphere Kyoto UniversityUjiKyotoJapan Silviculture Research Institute Vietnamese Academy of Forest SciencesNorth Tu LiemHanoiVietnam Center for Southeast Asian Studies Kyoto UniversityKyotoJapan Vietnamese Academy of Forest Sciences North Tu LiemHanoiVietnam Vietnam Administration of Forestry No.2 Ngoc HaBa DinhHanoiVietnam

Biotic and abiotic factors control aboveground biomass(AGB)and the structure of forest *** study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam.A data set of 1731-ha plots from 52 locations in undisturbed old-growth forests was *** results indicate that basal area and AGB are closely correlated with annual precipitation,but not with annual temperature,evaporation or hours of *** area and AGB are positively correlated with trees>30 cm *** areas surveyed(52.6%)in these old-growth forests had AGB of 100–200 Mg ha^-1;5.2%had AGB of 400–500 Mg ha^-1,and 0.6%had AGB of>800 Mg ha^-*** percent of the areas surveyed had stand densities of 300–600 ***^-1,and 64%had basal areas of 20–40 m^2 ha^-*** is an important factor influencing the AGB of old-growth,evergreen broadleaved forests in *** causing the loss of large-diameter trees(e.g.,>100 cm DBH)affects AGB but may not seriously affect stand density.

关键词： Aboveground biomass Carbon storage Climatic variables Ecoregion Edaphic variables Oldgrowth forest

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