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Dimensionality-driven metal to Mott insulator transition in two-dimensional 1T-TaSe2

National Science Review 2024年第3期11卷 108-118页

作者： Ning Tian Zhe Huang bo gyu jang Shuaifei Guo Ya-Jun Yan Jingjing Gao Yijun Yu Jinwoong Hwang Cenyao Tang Meixiao Wang Xuan Luo Yu Ping Sun Zhongkai Liu Dong-Lai Feng Xianhui Chen Sung-Kwan Mo Minjae Kim Young-Woo Son Dawei Shen Wei Ruan Yuanbo Zhang State Key Laboratory of Surface Physics New Cornerstone Science Laboratory and Department of PhysicsFudan University Shanghai Qi Zhi Institute Shanghai Research Center for Quantum Sciences Institute for Nanoelectronic Devices and Quantum Computing Fudan University Zhangjiang Fudan International Innovation Center Fudan University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences School of Physical Science and Technology ShanghaiTech University Korea Institute for Advanced Study School of Emerging Technology and Department of Physics University of Science and Technology of China Advanced Light Source Lawrence Berkeley National Laboratory ShanghaiTech Laboratory for Topological Physics Key Laboratory of Materials Physics Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Collaborative Innovation Centre of Advanced Microstructures Nanjing University Department of Physics University of Science and Technology of China and Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China

Two-dimensional materials represent a major frontier for research into exotic many-body quantum phenomena. In the extreme two-dimensional limit, electron-electron interaction often dominates over other electronic energy scales, leading to strongly correlated effects such as quantum spin liquid and unconventional *** dominance is conventionally attributed to the lack of electron screening in the third dimension. Here, we discover an intriguing metal to Mott insulator transition in 1T-TaSe2that defies conventional wisdom. Specifically, we find that dimensionality crossover, instead of reduced screening, drives the transition in atomically thin 1T-TaSe2. A dispersive band crossing the Fermi level is found to be responsible for the bulk metallicity in the material. Reducing the dimensionality,however, effectively quenches the kinetic energy of these initially itinerant electrons, and drives the material into a Mott insulating *** dimensionality-driven metal to Mott insulator transition resolves the long-standing dichotomy between metallic bulk and insulating surface of 1T-TaSe2. Our work further reveals a new pathway for modulating two-dimensional materials that enables exploring strongly correlated systems across uncharted parameter space.

关键词： two-dimensional materials 1T-TaSe2 dimensionality crossover metal to Mott insulator transition

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地核温压下铁合金的超离子态转变及其对地震波速的影响

地核温压下铁合金的超离子态转变及其对地震波速的影响

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作者：何宇孙士川 Duck Young Kim bo gyu jang 李和平毛河光

地球内核是地球中最神秘的区域,地震学观测显示,地球内核密度比纯铁密度低,表示存在部分比铁轻的元素,其中C, H, O, Si, S被认为是最有可能存在于地球内核的轻元素[1,2].这些轻元素的存在将对地球内核物质的熔点、弹性、热导率等性质产... 详细信息

地球内核是地球中最神秘的区域,地震学观测显示,地球内核密度比纯铁密度低,表示存在部分比铁轻的元素,其中C, H, O, Si, S被认为是最有可能存在于地球内核的轻元素[1,2].这些轻元素的存在将对地球内核物质的熔点、弹性、热导率等性质产生显著影响,因此研究地球内核轻元素的组成是内核研究的重要课题[3-5]。然而,前人很少关注这些轻元素的状态,

关键词：地震波速第一性原理分子动力学离子态铁合金

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专用肥用量对油菜籽产量及品质的影响

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中国油料作物学报 2024年第2期46卷 359-369页

作者：方雯任涛刘方舟蒋博鲁明星张哲鲁剑巍华中农业大学资源与环境学院/农业农村部长江中下游耕地保育重点实验室/华中农业大学微量元素研究中心湖北武汉430070 湖北省油菜办公室湖北武汉430070 全国农业技术推广服务中心北京100125

肥料是保障农作物生长的重要物质基础,油菜专用配方肥施用作为油菜轻简化种植的关键技术在生产中广泛应用,明确兼顾丰产和优质双重目标的油菜专用配方肥适宜用量将为油菜绿色高质生产提供关键技术支撑。通过2020-2021年在湖北省江陵县... 详细信息

肥料是保障农作物生长的重要物质基础,油菜专用配方肥施用作为油菜轻简化种植的关键技术在生产中广泛应用,明确兼顾丰产和优质双重目标的油菜专用配方肥适宜用量将为油菜绿色高质生产提供关键技术支撑。通过2020-2021年在湖北省江陵县、沙洋县及洪湖市等3个地点的田间试验,设置了0、450、600、750和900 kg/hm^(2)5个肥料用量,研究不同专用配方肥用量对油菜产量、产量构成因子、养分含量及品质的影响。施用专用配方肥可显著提高单株角果数、每角粒数及千粒重,进而提升油菜籽产量。与不施肥处理相比,专用配方肥施用量为900kg/hm^(2)时,单株角果数、每角粒数及千粒重平均值分别增加277.4%、17.9%和9.2%,油菜籽增产率达300%。油菜专用配方肥的施用显著影响了油菜籽油分及蛋白质含量,与不施肥处理相比,油菜籽蛋白质含量在专用配方肥用量为900 kg/hm^(2)时最高,增长率为16.0%~34.6%,而含油量最低,相较于不施肥降低了4.4%~11.6%。相关性分析表明,增施专用肥显著增加了油菜籽产量、含水率、蛋白质、芥酸及脂肪酸组成,减少了油菜籽硫甙含量。兼顾产量、油菜籽品质和饲用等方面,专用肥用量控制在750~900 kg/hm^(2)时,能够在获得较高的菜籽产量及蛋白质产量的同时,菜籽中硫甙、芥酸及饱和脂肪酸的生成增幅较小并提高了产油量。要在油菜增产的基础上继续追求品质提升,可结合不同地力条件,适量增加中微量元素,以进一步提高油菜籽含油率和改善脂肪酸的组成,实现产量与品质的协同。

关键词：油菜专用肥适宜用量产量品质相关性分析

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Improving ionic conductivity of von-Alpen-type NASICON ceramic electrolytes via magnesium doping

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Journal of Advanced Ceramics 2023年第5期12卷 1058-1066页

作者： Il-Seop jang Wooseok Go bo-Ye Song Hayoung Park Yun Chan Kang Jinyoung Chun Emerging Materials R&D Division Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Energy Storage and Distribution Resources Division Lawrence Berkeley National LaboratoryBerkeley 94720USA

NASICON (sodium (Na) superionic conductor) compounds have attracted considerable attention as promising solid electrolyte materials for advanced Na-based batteries. In this study, we investigated the improvement in ionic conductivities of von-Alpen-type NASICON (vA-NASICON) ceramic electrolytes by introducing a magnesium ion (Mg^(2+)) as a heterogeneous element. The optimal Mg-doped vA-NASICON exhibited a high ionic conductivity of 3.64×10^(−3) S·cm^(−1), which was almost 80% higher than that of un-doped vA-NASICON. The changes in physicochemical properties of the vA-NASICONs through the Mg introduction were systematically analyzed, and their effects on the ionic conductivities of the vA-NASICON were studied in detail. When the optimal ratio of Mg^(2+) was used in a synthetic process, the relative density (96.6%) and grain boundary ionic conductivity (σgb) were maximized, which improved the total ionic conductivity (σt) of the vA-NASICON. However, when Mg^(2+) was introduced in excess, the ionic conductivity decreased because of the formation of an undesired sodium magnesium phosphate (NaxMgyPO_(4)) secondary phase. The results of this study are expected to be effectively applied in the development of advanced sodium-based solid electrolytes with high ionic conductivities.

关键词： NASICON solid electrolyte von-Alpen-type magnesium(Mg)doping ionic conductivity

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Microstructural analysis of organic matter in shale by SAXS and WAXS methods

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Petroleum Science 2022年第3期19卷 979-989页

作者： Kou-Qi Liu Zhi-Jun Jin Lian-bo Zeng Meng-Di Sun bo Liu Ho Won jang Majid Safaei-Farouji Mohammadreza Shokouhimer Mehdi Ostadhassan Institute of Energy Peking UniversityBeijing100871China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Continental Shale Accumulation and Efficient Development Ministry of EducationNortheast Petroleum UniversityDaqingHeilongjiang 163318China Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul08826Republic of Korea School of Geology College of ScienceUniversity of TehranTehranIran Department of Materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea Department of Geology Ferdowsi University of MashhadMashhadIran

Characterizing the kerogen-hosted pore structures is essential to understand the adsorption,transport and storage potential in organic-rich shale *** this paper,we first separated the organic matter(kerogen)from the mineral matrix in four different shale samples of the Bakken Formation with different thermal maturities and then analyzed their chemical compositions using the wide-angle X-ray scattering(WAXS)***,we acquired small-angle X-ray scattering(SAXS)to characterize the structure of the organic matter and see how these two will *** WAXS results showed that the isolated kerogens have high purity(free of inorganic minerals)and retain different chemical ***,SAXS analysis revealed that the isolated kerogens have similar radius of gyration(R_(g))which is around 90Åand the molecules are in the compact *** on the pore size distribution analysis from the SAXS data,two main peaks were found in all of these four samples with one peak less than 40Åand the other one larger than 1000Å.Also,the TEM images revealed that Sample 1 is abundant in pores with sizes around 20 nm while Sample 2 does not have pores of that size,which agrees with the results from the pore size distribution that was obtained from the SAXS ***,this study exhibits how different analytical instruments can provide us with useful information from complex structures of geomaterials.

关键词： Isolated kerogen Bakken shale SAXS WAXS Pore structures

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Repeated ventricular bigeminy by trigeminocardiac reflex despite atropine administration during superficial upper lip surgery: A case report

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World Journal of Clinical Cases 2022年第32期10卷 11967-11973页

作者： Su-Yeon Cho bo-Hyun jang Hye-Jin Jeon Dong-Joon Kim Department of Anesthesiology and Pain Medicine Chosun University HospitalGwangju 61453South Korea

BACKGROUND The trigeminocardiac reflex(TCR)is usually caused by an increased parasympathetic tone when pressure or traction is applied to the surrounding tissue of the trigeminal ***,the inexperienced anesthesiologists may have challenges on the management of TCR *** SUMMARY This is the case of an 18-year-old woman diagnosed with hemangioma of the upper *** the operation,about 1 h after surgery started,a constant 1:1 premature ventricular complex was detected,and blood pressure was decreased when approaching the deeper part with more strong traction for exposure of the *** the management of arrhythmias,such as lidocaine and atropine,was injected,arrhythmia induced by surgical stimulation could not be eliminated *** the traction repeated,bradycardia was also repeated,despite injecting additional ***,the anesthesiologist and the surgeon decided to perform the operation only to the extent that the vascular tissue was selectively removed only at the site without the *** With TCR,anesthesiologists should perform appropriate *** addition to proper drug administration,surgeons should be consulted to cope with stopping the surgery and setting the scope of the surgery even if the site is superficial.

关键词： Trigeminocardiac reflex Bigeminy Arrhythmia Hypotension Atropine Case report

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Surface-functionalized cellulose nanocrystals(CNC)and synergisms with surfactant for enhanced oil recovery in low-permeability reservoirs

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Petroleum Science 2023年第3期20卷 1572-1583页

作者： Zhe Li Wan-Li Kang Meng-Lan Li Hong-Bin Yang Tong-Yu Zhu Ying-Qi He Hai-Zhuang jang bo-bo Zhou Ji-Ting Hao Key Laboratory of Unconventional Oil&Gas Development China University of Petroleum(East China)Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China

Nanocellulose,a natural polymeric nanomaterial,has attracted significant attention in enhanced oil recovery(EOR)applications due to its abundance,nanoscale,high oil-water interfacial adsorption *** this study,surface-functionalized cellulose nanocrystals(SF-CNCs)were prepared via hy-drochloric acid hydrolysis and chemical modification,with adaptable nanosize and considerable dispersion stability in low-permeability *** SF-CNCs were structurally characterized by FT-IR,Cryo-TEM,which have a diameter of 5-10 nm and a length of 100-200 *** SF-CNC dispersions possessed higher stability and stronger salt-tolerance than those of corresponding CNC dispersions,due to the strong hydrophilicity of the sulfonic acid *** was synergistically used with a non-ionic surfactant(APG1214)to formulate a combined flooding system(0.1 wt%SF-CNC+0.2 wt%APG1214).The combined flooding system exhibits strong emulsification stability,low oil-water interfacial tension of o.03 mN/m,and the ability to alter the wettability for oil-wetting ***,the combined system was_able to provide an optimum EOR efficiency of 20.2%in low-permeability cores with 30.13×10^(-3)μm^(2).*** can enlarge the sweep volume and increase the displacement efficiency ***,the newly formulated nanocellulose/surfactant combined system exhibits a remarkable EoR performance in low-permeability reservoirs.

关键词： Low-permeability reservoirs Enhanced oil recovery Cellulose nanocrystals(CNC) Surfactant Dispersion stability

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Glucocorticoid pulse therapy in an elderly patient with post-COVID-19 organizing pneumonia:A case report

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World Journal of Clinical Cases 2023年第17期11卷 4152-4158页

作者： Shinhee Park Youngeun jang So-My Koo bo Da Nam Hee-Young Yoon Division of Allergy and Pulmonary Medicine Department of Internal MedicineSoonchunhyang University Bucheon HospitalBucheon 14584South Korea Division of Allergy and Respiratory Diseases Department of Internal MedicineSoonchunhyang University Seoul HospitalSeoul 04401South Korea Department of Radiology Soonchunhyang University Seoul HospitalSeoul 04401South Korea

BACKGROUND Pulmonary fibrosis often occurs as a sequel of coronavirus disease 2019(COVID-19);however,in some cases,it can rapidly progress,similar to the acute exacerbation of interstitial lung *** are the standard treatment for severe COVID-19 pneumonia requiring oxygen supply;however,the post-COVID-19 efficacy of high-dose steroid therapy remains ***,we presented a case of an 81-year-old man who developed acute respiratory failure after COVID-19 and was treated with glucocorticoid pulse *** SUMMARY An 81-year-old man with no respiratory symptoms was admitted due to a diabetic *** had been previously treated for COVID-19 pneumonia six weeks ***,upon admission,he suddenly complained of dyspnea and required a high-flow oxygen *** simple chest radiography and computed tomography(CT)revealed diffuse ground-glass opacities and consolidation in both ***,repeated sputum tests did not identify any infectious pathogens,and initial broad-spectrum antibiotic therapy did not result in any clinical improvement with the patient having an increasing oxygen *** patient was diagnosed with post-COVID-19 organizing ***,we initiated glucocorticoid pulse therapy of 500 mg for three days followed by a tapered dose on hospital day(HD)*** three days of pulse treatment,the patient's oxygen demand *** patient was subsequently discharged on HD 41,and chest radiography and CT scans have almost normalized nine months after *** Glucocorticoid pulse therapy may be considered when the usual glucocorticoid dose is ineffective for patients with COVID-19 sequelae.

关键词： Coronavirus Glucocorticoid Lung disease Interstitial Organizing pneumonia Case report

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Ni-Pt/MgAl_(2)O_(4)双金属催化剂构筑及其对不同构型烃类蒸汽重整制氢性能的影响

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化学研究与应用 2024年第6期36卷 1286-1294页

作者：张菲依王晨臣李煜张波陈昱江张琛琦郑锦泓焦毅鲍泽威四川大学化学工程学院四川成都610064 中国航空工业南京机电液压工程研究中心航空机电系统综合航空科技重点实验室江苏南京211106 北京动力机械研究所高超声速冲压发动机技术重点实验室北京100074 四川大学新能源与低碳技术研究院四川成都610064

航空煤油成分复杂,由上百种不同构型的烃类组成,然而正构烷烃、异构烷烃、环烷烃和芳香烃这几类主要组分的构型和性质差异甚大,导致其蒸汽重整反应特性存在较大差异。本论文在前期研发Ni/MgAl_(2)O_(4)基础上,引入Pt构建Ni-Pt双金属催化... 详细信息

航空煤油成分复杂,由上百种不同构型的烃类组成,然而正构烷烃、异构烷烃、环烷烃和芳香烃这几类主要组分的构型和性质差异甚大,导致其蒸汽重整反应特性存在较大差异。本论文在前期研发Ni/MgAl_(2)O_(4)基础上,引入Pt构建Ni-Pt双金属催化剂,系统考察了该催化剂对不同构型组分重整反应性能的差异,并对不同构型组分在该催化剂上的重整反应路径进行了阐述。结果表明:液相还原法引入Pt能够使双金属催化剂具有合适的酸性和良好的金属Ni分散性,Ni-Pt两种金属协同效应,不仅能够提高单Ni催化剂活性,同时能够减少Ni烧结,优化催化剂稳定性;另外,不同构型组分在双金属催化剂上的重整性能具有显著差异,其中正癸烷重整的产气率以及H_(2)选择性较为优异。不同构型烃类燃料的反应活性为:甲基环己烷>正癸烷>乙苯。由于甲基环己烷在反应过程中C-C键键能弱,易开环形成链状自由基与水发生重整反应,乙苯具有芳香烃结构且不易开环,重整反应所需能量较高。

关键词：燃油蒸汽重整制氢 Ni-Pt双金属催化剂不同构型烃类液相还原法

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癸酸基相变材料的制备及性能研究

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塑料科技 2024年第4期52卷 28-32页

作者：杨迪思芳车秋凌代阿瑞杨敏鸽姜凤阳叶根根王俊勃西安工程大学材料工程学院陕西西安710048 安踏(中国)有限公司福建晋江362212 陕西鼎新汇智功能材料科技有限公司陕西西安710048

目前智能调温织物存在温度范围窄、价格昂贵、稳定性不足等问题。为解决此问题,文章采用物理共混的方法制备癸酸/聚甲基丙烯酸甲酯(CA/PMMA)和癸酸/聚乙烯醇(CA/PVA)低温相变材料。采用差示扫描量热法、导热系数测定仪、傅里叶红外光谱... 详细信息

目前智能调温织物存在温度范围窄、价格昂贵、稳定性不足等问题。为解决此问题,文章采用物理共混的方法制备癸酸/聚甲基丙烯酸甲酯(CA/PMMA)和癸酸/聚乙烯醇(CA/PVA)低温相变材料。采用差示扫描量热法、导热系数测定仪、傅里叶红外光谱分析仪、同步热重分析仪对相变材料的储热性能、导热系数、化学结构、热稳定性进行表征。结果表明:CA含量为80%的CA/PVA低温相变材料综合性能较好,其相变温度为29.69℃,相变潜热为325.40 J/g,导热系数为0.8154 W/(m·K)。PVA和PMMA的加入促进了CA基相变材料的界面相容性,使其相变材料的缺陷和界面空隙相对较多,热量传递效率较快,有效提高了导热性能。PVA和PMMA的包覆延缓了燃烧界面以外的热量和氧气向材料内部迁移的速度,起到隔热作用,同时也提高了相变材料的热稳定性。

关键词：癸酸甲基丙烯酸甲酯聚乙烯醇低温相变材料

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