检索结果-内蒙古大学图书馆

Formation of the structure-Ⅱgas hydrate from low-concentration propane mixed with methane

Chinese Journal of Chemical engineering 2023年第6期58卷 306-314页

作者： Sanya Du Xiaomin Han Wenjiu Cai Jinlong Zhu Xiaobai Ma Songbai Han Dongfeng Chen Yusheng Zhao Hui Li Hailong Lu Xiaohui Yu Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Engineering Peking UniversityBeijing 100871China Beijing International Center for Gas Hydrate School of Earth and Space SciencesPeking UniversityBeijing 100871China Department of Physics Southern University of Science and Technology(SUSTech)Shenzhen 518055China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology(SUSTech)Shenzhen 518055China Songshan Lake Materials Laboratory Dongguan 523808China

It has been recognized that a small amount of propane mixed with methane can change greatly in not only the thermodynamics but also the structural properties of gas ***,its mechanism is still not well understood *** this research,structure-Ⅱ(sⅡ)hydrate is synthesized using a methanepropane gas mixture with an initial mole ratio of 99:1,and it is found that large(5~(12)6~4)cages are cooccupied by multiple gases based on the rigid structure analysis of neutron diffraction *** first principles calculation and molecular dynamics simulation are conducted to uncover the molecular mechanism for sⅡmethane-propane hydrate formation,revealing that the presence of propane inhibits the formation of structure-Ⅰ(sⅠ)hydrate but promotes sⅡhydrate *** results help to understand the accumulation mechanism of natural gas hydrate and benefit to optimize the condition for gas storage and transportation in hydrate form.

关键词： Multiple guest molecules Clathrates Neutron powder diffraction Structural transformation Molecular mechanism

来源：评论

学校读者我要写书评

暂无评论

Enhanced resistive switching properties of HfAlOx/ZrO2- based RRAM devices

引用

Progress in Natural science:materials International 2022年第5期32卷 602-607页

作者： P.R.Sekhar Reddy Venkata Raveendra Nallagatla Yedluri Anil Kumar G.Murali School of Material Science and Engineering Pusan National University Department of Physics and Oxide Research Centre Memory and Catalyst Research Center Hankuk University of Foreign Studies Materials Center Leoben Forschung GmbH Department of Physics United Arab Emirates University Department of Polymer Science and Engineering Department of IT-Energy Convergence (BK21 FOUR) Chemical Industry Institute Korea National University of Transportation

Resistive Random-Access Memory（RRAM） devices are recognized as potential candidates for next-generation memory devices, due to their smallest cell size, high write/erase speed, and endurance. Particularly, the resistive switching（RS） characteristics in oxide materials have offered new opportunities for developing CMOScompatible high-density RRAM devices. In this study, the RS behavior of HfAlOx/ZrO2thin films sandwiched structure between TiN bottom electrode and Au top electrodes were investigated. It was found that Au/HfAlOx/ZrO2/TiN stacks were superior in terms of RS performance when compare to Au/HfAlOx/TiN memory stacks. The devices demonstrated a good resistance ratio of high resistance state and low resistance state ～103 for Au/HfAlOx/TiN and ～105 for Au/HfAlOx/ZrO2/TiN stacks, respectively. Both stacks showed good retention characteristics（>104s） and endurance（>103cycles）. The experimental current-voltage characteristics fitted with different conducting mechanisms, the linear lower bias region is dominated by ohmic conductivity, whereas the non-linear higher bias region was dominated by space-charge limited current conduction mechanism.

关键词： Nonvolatile memory RRAM Resistive switching mechanism Atomic layer deposition Current conduction mechanism

来源：评论

学校读者我要写书评

暂无评论

Dry-season sources of riverine sediment from the tropical mixed urban-agricultural watershed of the Mun River Basin in northeastern Thailand

引用

International Journal of Sediment Research 2023年第2期38卷 240-252页

作者： Arika Bridhikitti Thayukorn Prabamroong Gaohuan Liu Environmental Engineering and Disaster Management Program School of Interdisciplinary Studies Mahidol University Kanchanaburi Campus Earth Science Research Center Mahidol University Kanchanaburi Campus Faculty of Environment and Resource Studies Mahasarakham University State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Northeastern(NE) Thailand is well recognized as the land for rice cropping and consequently, it is potentially contaminated with chemicals from soil fertilization, pest/weed control, and urban *** Mun River basin in NE Thailand principally is comprised of rice paddies and sedimentation in the river has been pronounced, but the studies on sediment source identification are limited. The current study aims to identify sediment sources in the Mun River basin and discuss possible impacts on ecosystems attributed to exposure to polluted sediment. The assessment relies upon physicochemical properties and heavy metal contents(iron(Fe), manganese(Mn), copper(Cu), chromium(Cr), nickel(Ni),and Zinc(Zn)) in the fine-grained sediment(<63 μm) taken from the Mun River basin and the Chi River in the dry season of 2020-2021. The findings revealed that the heavy metals in the sediment had not accumulated to levels of concern. Most sediment was from natural sources, including Fe-and Mn-rich sediment, Cr-dominant sediment, and Ni-and Cu-rich sediment. Fe-and Zn-rich sediment was, however, found in the urban watershed of Lam Ta Klong, and it could originate from mixed urban sources. Ferich sediment was predominant in the Mun River basin, which and could be a significant sink and source of toxic elements from agricultural and urban discharges. It is suggested that the toxic compounds in the sediment should be consistently monitored, whereas ecological and health risk assessment should be focused on the mobile forms.

关键词： Sediment Heavy metals Mun River Lower Mekong River Agriculture

来源：评论

学校读者我要写书评

暂无评论

The behavior of different clays subjected to a fast-drying cycle for traditional ceramic manufacturing

引用

Journal of King Saud University - engineering sciences 2024年第5期36卷 339-348页

作者： Zaccaron, Alexandre de Souza Nandi, Vitor Dal Bó, Marcelo Arcaro, Sabrina Bernardin, Adriano Michael Program on Materials Science and Engineering Universidade do Extremo Sul Catarinense Avenida Universitária 1105 Santa Catarina Criciúma88806-000 Brazil SC Criciúma88813-600 Brazil Ceramic Materials Group Parque Científico e Tecnológico Rodovia Jorge Lacerda 3800 Santa Catarina Criciúma88807-400 Brazil

studies have been widely carried out on drying techniques and equipment. The behavior of clays subjected to drying stages requires further research. This study aims to evaluate the behavior of the clay ceramic body during the different stages of the drying cycle and match the characteristics of the raw materials with the final quality of the pieces. In this work, the behavior of three different clays in terms of drying performance was studied. The clays were selected, and their chemical, mineralogical, and particle size characteristics were measured. The mixture design (DoE) developed 10 formulations and was processed through vacuum extrusion. The samples were subjected to forced drying cycles of 180 min by varying the temperature from 30 to 90 °C and air speed from 1.5 to 4.0 m/s. At the end of the cycle, the retraction was a determining factor for the crack probability indicator, where formulations that obtained ∼10% retraction in the dry zone showed losses >25%. On the other hand, it is could be stated that claystone assists the drying process of the ceramic piece, minimizing losses. The drying sensitivity coefficient (k-factor) presented values that reproduce the number of losses during drying, proving to be a valid tool to relate clay properties, drying conditions, and losses in this process. In this case, drying process losses >25% were observed when the k-factor was from 1.6. © 2022 The Authors

关键词： Drying

来源：评论

学校读者我要写书评

暂无评论

Injectable Platelet-Rich Fibrin in Contact with Bone Substitutes, Porous Zirconia, or Laser-Textured Implant Surfaces: A Detailed Morphological Analysis

引用

Biomedical materials and Devices 2024年第1期2卷 415-426页

作者： Oliveira, Miguel Noronha Varela, Hugo Almeida Nascimento, Rubens M. Sahoo, Narayan Carvalho, Oscar Henriques, Bruno Souza, Júlio C. M. Ceramic and Composite Materials Research Group (CERMAT) Department of Mechanical Engineering (EMC) Federal University of Santa Catarina (UFSC) Post-graduate Program in Materials Science and Engineering Federal University of Rio Grande Norte (UFRN) Center for MicroElectroMechanical Systems (CMEMS-UMINHO) Universidade do Minho LABBELS - Associate Laboratory University of Minho University Institute of Health Sciences (IUCS) CESPU

The aim of the present study was to perform a detailed morphological analysis of an injectable platelet rich fibrin after combination with two different particulate hydroxyapatite-based granules, a porous zirconia block, and laser-textured zirconia or titanium surfaces. Blood samples were harvested from three participants to prepare the flowable injectable PRF in contact or not with particulate hydroxyapatite (Hap), bone mineral granules (DBBM), porous zirconia blocks, laser-textured titanium or zirconia surfaces. Optical and scanning electron microscopy (SEM) were used to evaluate the fibrin network density, fibrin fibers’ diameter, blood cells, and the interaction of PRF with the biomaterials. Histomorphometry of the flowable PRF was also performed using the hematoxylin–eosin staining protocol. Specimens were independently evaluated by two blinded and well-trained researchers in histomorphometry and microscopy. Particulate Hap and DBBM shown different morphological aspects by SEM analyses since DBBM revealed macro- and micro-scale pores while Hap revealed a dense structure. Hydroxyapatite and DBBM granules were entirely embedded by the fibrin-network in the presence of leukocytes and blood platelets. The zirconia porous structured was filled with PRF and its components. Also, the laser-structured zirconia or implant surfaces were entirely coated with the PRF fibrin network embedding leukocytes and blood platelets. Laser-textured titanium surfaces revealed macro- and micro-scale irregularities that increase the surface area and retention of the injectable PRF. Histomorphometric analyses revealed complementary details on the distribution of lymphocytes, red blood cells, and fibrin associated with platelet aggregation. The flowing and viscosity of an injectable platelet rich fibrin provided an agglomeration of synthetic or xenogeneic particulate bone substitutes and the coating of porous zirconia and textured implant surfaces as inspected by scanning electron microsc

关键词： Bone healing Bone substitutes Histology Morphology Platelet-rich fibrin

来源：评论

学校读者我要写书评

暂无评论

The Scalability of Third Generation Photovoltaics: Deposition Techniques and Modularity

The Scalability of Third Generation Photovoltaics: Depositio...

引用

2023 Sharjah International Conference on Physics of Advanced materials, SICPAM 2023

作者： Ayoub, Mohamad Alashkar, Adnan Mdallal, Ayman Ibrahim, Taleb Khamis, Mustafa Alami, Abdul Hai Sustainable and Renewable Energy Engineering Department University of Sharjah Sharjah27272 United Arab Emirates PhD Program in Materials Science and Engineering American University of Sharjah Sharjah26666 United Arab Emirates Department of Chemical Engineering American University of Sharjah Sharjah26666 United Arab Emirates Department of Biology Chemistry and Environmental Sciences College of Arts and Sciences American University of Sharjah Sharjah26666 United Arab Emirates Center for Advanced Materials Research Research Institute of Science and Engineering University of Sharjah Sharjah27272 United Arab Emirates

The development of third-generation photovoltaic (TGPV) technologies promises to address some of the limitations of conventional silicon-based solar cells. However, the scalability of these technologies is a critical factor in their practical application. TGPV include Perovskite Solar Cells (PSC), Organic Solar Cells (OSC), and Dye-Sensitized Solar Cell (DSSC). This paper reviews and summarizes the recent trends and research on the deposition techniques and modularity of TGPV. Various deposition techniques such as slot-die coating, thermal evaporation, and spray pyrolysis are discussed, along with their advantages and limitations. Modularity, which allows for the integration of TGPV cells into different structures, is also examined as a critical factor in scalability. The paper concludes that the scalability of TGPV technologies depends on the development of efficient and cost-effective deposition techniques and modularity, which will facilitate the integration of the TGPV cells into various structures and enable the widespread use of these promising technologies. © Published under licence by IOP Publishing Ltd.

关键词： Perovskite solar cells

来源：评论

学校读者我要写书评

暂无评论

Universal hydrogel adhesives with robust chain entanglement for bridging soft electronic materials

引用

npj Flexible Electronics 2024年第1期8卷 509-522页

作者： Yejin Jo Yurim Lee Jeong Hyun Heo Yeonzu Son Tae Young Kim Kijun Park Soye Kim Seo Jung Kim Yoonhee Jin Seongjun Park Jungmok Seo School of Electrical and Electronic Engineering Yonsei UniversitySeoul03722Republic of Korea Department of Physiology Yonsei University College of MedicineSeoul03722Republic of Korea Program of Brain and Cognitive Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon34141Republic of Korea Department of Pediatrics Severance Children’s HospitalYonsei University College of MedicineSeoul03722Republic of Korea Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon34141Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon34141Republic of Korea KAIST Institute for Nano Century(KINC) 291 Daehak-roYuseong-guDaejeon34141Republic of Korea

Ensuring stable integration of diverse soft electronic components for reliable operation under dynamic conditions is ***,integrating soft electronics,comprising various materials like polymers,metals,and hydrogels,poses challenges due to their different mechanical and chemical *** study introduces a dried-hydrogel adhesive made of poly(vinyl alcohol)and tannic acid multilayers(d-HAPT),which integrates soft electronic materials through moisture-derived chain entanglement.d-HAPT is a thin(~1μm)and highly transparent(over 85%transmittance in the visible light region)adhesive,showing robust bonding(up to 3.6 MPa)within a short time(<1 min).d-HAPT demonstrates practical application in wearable devices,including a hydrogel touch panel and strain ***,the potential of d-HAPT for use in implantable electronics is demonstrated through in vivo neuromodulation and electrocardiographic recording experiments while confirming its biocompatibility both in vitro and in *** is expected that d-HAPT will provide a reliable platform for integrating soft electronic applications.

关键词： properties hydrogel electronic

来源：评论

学校读者我要写书评

暂无评论

Asymmetric Two-Component Alkenyl Catellani Reaction for the Construction of C—N Axial Chirality

引用

Chinese Journal of Chemistry 2024年第7期42卷 699-704页

作者： Chenggui Wu Ze-Shui Liu Yong Shang Chang Liu Shuang Deng Hong-Gang Cheng Hengjiang Cong Yinchun Jiao Qianghui Zhou Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds&Materials(Ministry of Education)Hubei Key Lab on Organic and Polymeric OptoElectronic MaterialsCollege of Chemistry and Molecular SciencesThe Institute for Advanced Studiesand TaiKang Center for Life and Medical SciencesWuhan UniversityWuhanHubei 430072China Key Laboratory of Xin'an Medicine Ministry of EducationAnhui University of Chinese MedicineHefeiAnhui 230038China School of Chemistry and Chemical Engineering Hunan University of Science and TechnologyXiangtanHunan 411201China

Herein,we report an asymmetric two-component alkenyl Catellani reaction for the construction of C—N axial chirality through a palladium/chiral norbornene cooperative catalysis and an axial-to-axial chirality transfer *** partially aromatic iodinated 2-pyridones,quinolones,coumarin and uracil substrates react with 2,6-disubstituted aryl bromides with a tethered amide group,to afford a wide variety of polycyclic C—N atropisomers(38 examples,up to 97%e.e.).The obtained C—N axial chirality originates from the preformed transient C—C axial chirality with high *** synthetic utility of this chemistry is demonstrated by facile prepa-ration of complex quinoline and pyridine based C—N atropisomers through a N-deprotection and aromatization *** addi-tion,a remote axial-to-central diastereoinduction process dictated by C—N axial chirality is observed with excellent diastereocontrol.

关键词： Alkenyl Catellani reaction Asymmetric catalysis Atropisomerism Axial-to-axial chirality transfer Heterocycles

来源：评论

学校读者我要写书评

暂无评论

Electronically Conducting Titania Single Crystals Prepared by Flash Exhibit Memristor Switching

SSRN

引用

SSRN 2024年

作者： Jo, Seohyeon Raj, Rishi Materials Science Engineering Program Department of Mechanical Engineering University of Colorado Boulder BoulderCO80309 United States

We report memristor behavior in bar shaped single crystals of titania that have been "formed" into electronic conductors. The cycling experiments are carried out with forward and reverse current, rather than voltage;the current experiments are more reproducible. The single crystals permit in-situ measurements of interface as well as the end-to-end resistivities by the four-point method. The total specimen resistance is shown to be nearly equal to the sum of the interface resistances at the positive and negative electrodes referenced at the forming step. The memristor effect arises predominantly from the change in the interfacial resistance at the positive electrode which shows local ratio of high/low resistance of x103. The resistance at the opposite interface remains unchanged. The effect at the positive electrode is attributed to a change in the state of exciton-like electron-hole configurations under the local field induced by the current. The memristor effect is sensitive to crystal-orientation. © 2024, The Authors. All rights reserved.

关键词： Memristors

来源：评论

学校读者我要写书评

暂无评论

Micro and nano-sized bubbles for sanitation and water reuse:from fundamentals to application

引用

Frontiers of Environmental science & engineering 2024年第12期18卷 19-44页

作者： Abudukeremu Kadier Gulizar Kurtoglu Akkaya Raghuveer Singh Noorzalila Muhammad Niza Anand Parkash Ghizlane Achagri Prashant Basavaraj Bhagawati Perumal Asaithambi Zakaria Al-Qodah Naser Almanaseer Magdalena Osial Sunday Joseph Olusegun Agnieszka Pregowska Eduardo Alberto López-Maldonado Laboratory of Environmental Science and Technology The Xinjiang Technical Institute of Physics and ChemistryKey Laboratory of Functional Materials and Devices for Special EnvironmentsChinese Academy of SciencesUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Necmettin Erbakan University Environmental Engineering DepartmentKonya 42090Türkiye Research Division James R.Randall Research CenterArcher Daniels Midland(ADM)CompanyDecaturIL 62521USA Chemical Engineering Studies Universiti Teknologi MARA Cawangan Pulau PinangKampus Permatang Pauh13500 Permatang PauhPulau PinangMalaysia Department of Civil Engineering S.G.Balekundri Institute of TechnologyBelagaviKarnataka 590010India Faculty of Civil and Environmental Engineering Jimma Institute of TechnologyJimma UniversityJimma P.O.BOX 378Ethiopia Chemical Engineering Department Faculty of Engineering TechnologyAl-Balqa Applied UniversityAmman 15008Jordan International Research Center for Water Environmentand EnergyCivil Engineering DepartmentFaculty of EngineeringAl-Balqa Applied UniversityAmman 15008Jordan Institute of Fundamental Technological Research Polish Academy of SciencesPawinskiego 5B02-106 WarsawPoland Department of Chemistry Michigan State UniversityEast LansingMI 48824-1322USA Faculty of Chemical Sciences and Engineering Autonomous University of Baja California22424TijuanaB.C.Mexico

The global scarcity of drinking water is an emerging problem associated with increasing pollution with many chemicals from industry and rapid microbial growth in aquatic *** the wide availability of conventional water and wastewater treatment methods,many limitations and challenges exist to *** technology based on microbubbles(MBs)and nano-bubbles(NBs)offers ecological,fast,and cost-effective water *** due to the high stability and long lifetime of the bubbles in the water,high gas transfer efficiency,free radical generation capacity,and large specific surface areas with interface potential of generated *** and NBs-based technology are attractive solutions in various application areas to improve existing water and wastewater treatment processes including industrial *** this paper,recent progress in NBs and MBs technology in water purification and wastewater treatment along with fundamentals,application,challenges,and future research were comperhensively discussed.

关键词： Nanobubbles Microbubbles MNB Wastewater treatment Water pollution utilization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：