检索结果-南通市图书馆

Journal of Materials Science & Technology 2024年第6期173卷 218-224页

作者： l.y.hao E.G.Fu State Key laboratory of Nuclear Physics and Technology Department of Technical PhysicsSchool of PhysicsPeking UniversityBeijing 100871China

Superconducting materials with high critical temperature have the potential to revolutionize many fields,including military,electronic communications,and power ***,scientists around the world have been tirelessly working with the ultimate goal of achieving high-temperature *** 2023,a preprint by lee et *** South Korea claimed the discovery of ultra-high-temperature superconductivity with a critical temperature of up to 423 K in Cu-doped lead-apatite(lK-99)(arXiv:2307.12008,arXiv:2307.12037),which caused a worldwide sensation and ***,the electronic structures,phonon dynamics,and electrical conductivities of lK-99 and its parent compound lead-apatite have been calculated using first-principles *** results show that the lead-apatite compound and the lK-99 compound are insulator and half-metal *** flat band characteristic is consistent with previous *** electrical conductivity of the lK-99 compound shows two extreme points,and the electrical conductivity along the C-axis increases significantly after 400 *** phonon dispersion spectra of the compounds were investigated,demonstrating their dynamic instability.

关键词： Superconductivity lK-99 lead-apatite First-principles calculation

THE SEASONAl FlUCTUATION OF SERUM VITAMIN A AND ITS NUTRITION STATUS AFFECTED By CARORENOID INTAKES IN CHINESE CHIlDREN

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

THE SEASONAL FLUCTUATION OF SERUM VITAMIN A AND ITS NUTRITIO...

Decomposition solutions and Bäcklund transformations of the B-type and C-type Kadomtsev-Petviashvili equations

第二届中日维生素国际学术研讨会

作者： Shianyin GuangwenTang J.Qin l.y.hao Q.M.Xu S.M.Hu RobertM.Russell Institute of Nutrition and Food Hygiene Chinese Academy of Preventive Medicine Beijing100050 China Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts UniversityBoston USA Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts UniversityBoston USA Shunyi County Health and Epidemic Prevention Center Shunyi County 101300BeijingChina Institute of Nutrition and Food Hygiene Chinese Academy of Preventive Medicine Beijing100050 China Institute of Nutrition and Food Hygiene Chinese Academy of Preventive Medicine Beijing100050 China Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts UniversityBoston USA

＜正＞In order to understanding the seasonal fluctuaion of serum vitamin A and effect of carotenoidsnutrition status on vitamin A status,eighty children（about 10y）,from the fourth grade of BanqiaoPrimary School in Shunyi County of Beijing,were enrolled in this study.A fashng serum samole（＜3ml whole blood）was drawn from the forearm on April 20,May 11,and October20,*** vitamin A and carotenoids were assayed by HPlC *** main nutrient intakes ofchildren in Shanyi County were estimated by the 24hour recall at each blood *** results

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第6期76卷 34-44页

作者： Xiazhi hao S y lou College of Science Zhejiang University of TechnologyHangzhou 310014China School of Physical Science and Technology Ningbo UniversityNingbo 315211China

This paper introduces a modified formal variable separation approach,showcasing a systematic and notably straightforward methodology for analyzing the B-type Kadomtsev-Petviashvili(BKP)*** the application of this approach,we successfully ascertain decomposition solutions,Bäcklund transformations,the lax pair,and the linear superposition solution associated with the aforementioned ***,we expand the utilization of this technique to the C-type Kadomtsev-Petviashvili(CKP)equation,leading to the derivation of decomposition solutions,Bäcklund transformations,and the lax pair specific to this *** results obtained not only underscore the efficacy of the proposed approach,but also highlight its potential in offering a profound comprehension of integrable behaviors in nonlinear ***,this approach demonstrates an efficient framework for establishing interrelations between diverse systems.

关键词： decomposition solution Backlund transformation lax pair linear superposition solution

Higher-dimensional integrable deformations of the modified KdV equation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第7期75卷 15-21页

作者： Xiazhi hao S y lou College of Science Zhejiang University of TechnologyHangzhouChina School of Physical Science and Technology Ningbo UniversityNingbo315211China

The derivation of nonlinear integrable evolution partial differential equations in higher dimensions has always been the holy grail in the field of *** well-known modified Kd V equation is a prototypical example of an integrable evolution equation in one spatial *** there exist integrable analogs of the modified Kd V equation in higher spatial dimensions?In what follows,we present a positive answer to this *** particular,rewriting the(1+1)-dimensional integrable modified Kd V equation in conservation forms and adding deformation mappings during the process allows one to construct higher-dimensional integrable ***,we illustrate this idea with examples from the modified Kd V hierarchy and also present the lax pairs of these higher-dimensional integrable evolution equations.

关键词： higher-dimensional integrable equation conservation form deformation mapping lax integrability symmetry integrability

Frequency Veering of Rotating Metal Porous Twisted Plate with Cantilever Boundary Using Shell Theory

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2022年第2期35卷 282-302页

作者： y.y.liu y.X.hao W.Zhang l.T.liu S.W.yang y.T.Cao College of Mechanical Engineering Beijing Information Science and Technology UniversityBeijing 100192China College of Mechanical Engineering Beijing University of TechnologyBeijing 100124China

The frequency veering of a metal porous rotating cantilever twisted plate with twist angle and stagger angle is *** porous materials may have the characteristics of gradient or uniform distribution along the thickness *** on the classical shell theory,considering the influence of centrifugal force produced by high-speed rotation,the free vibration equations of a rotating cantilever twisted plate are *** the polynomial function and Rayleigh-Ritz method,the natural frequencies and mode shapes of the metal porous cantilever twisted plate in both static and rotating states are *** accuracy of the present theory and calculation results is confirmed by a comparison between them and the results available from the literature and those obtained from *** influences of the thickness ratio,porosity,twist angle,stagger angle and rotational velocity on the frequency veering and mode shape shift of the rotating cantilever twisted plate with porous material under three different distributions are *** should be mentioned that the frequency veering accompanied by mode shape shift occurs in both static and dynamic states.

关键词： Frequency veering Rotating twisted plate Cantilever boundary Metal porous

Nanomaterials-mediated lysosomal regulation:a robust protein-clearance approach for the treatment of Alzheimer’s disease

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 424-439页

作者： Mengqi hao Jianjian Chu Tinglin Zhang Tong yin yuankai Gu Wendanqi liang Wenbo Ji Jianhua Zhuang yan liu Jie Gao you yin Department of Neurology Second Affiliated Hospital of Naval Medical University(Shanghai Changzheng Hospital)ShanghaiChina School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghaiChina Changhai Clinical Research Unit Shanghai Changhai HospitalNaval Medical UniversityShanghaiChina Department of Clinical Pharmacy Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Department of Neurology Shanghai East HospitalSchool of MedicineTongji UniversityShanghaiChina

Alzheimer’s disease is a debilitating,progressive neurodegenerative disorder characterized by the progressive accumulation of abnormal proteins,including amyloid plaques and intracellular tau tangles,primarily within the ***,crucial intracellular organelles responsible for protein degradation,play a key role in maintaining cellular *** studies have suggested a link between the dysregulation of the lysosomal system and pathogenesis of neurodegenerative diseases,including Alzheimer’s *** the normal physiological function of lysosomes hold the potential to reduce the pathological burden and improve the symptoms of Alzheimer’s ***,the efficacy of drugs in treating Alzheimer’s disease is limited,with major challenges in drug delivery efficiency and ***,nanomaterials have gained widespread use in Alzheimer’s disease drug research owing to their favorable physical and chemical *** review aims to provide a comprehensive overview of recent advances in using nanomaterials(polymeric nanomaterials,nanoemulsions,and carbon-based nanomaterials)to enhance lysosomal function in treating Alzheimer’s *** review also explores new concepts and potential therapeutic strategies for Alzheimer’s disease through the integration of nanomaterials and modulation of lysosomal *** conclusion,this review emphasizes the potential of nanomaterials in modulating lysosomal function to improve the pathological features of Alzheimer’s *** application of nanotechnology to the development of Alzheimer’s disease drugs brings new ideas and approaches for future treatment of this disease.

关键词： Alzheimer’s disease autophagy dysfunction lysosomal acidification lysosomal system nanomaterials neurodegenerative diseases

Natural vibration of cantilever porous twisted plate with variable thickness in different directions

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第9期27卷 200-216页

作者： y.X.hao y.y.liu W.Zhang l.T.liu K.C.Sun S.W.yang College of Mechanical Engineering Beijing Information Science and Technology UniversityBeijing100192PR China College of Mechanical Engineering Beijing University of TechnologyBeijing100124PR China

In this paper,the blade is assumed to be a rotating variable thickness cantilever twisted plate structure,and the natural vibrations of variable thickness cantilever twisted plate made of metal porous material are *** is assumed that the thickness of the plate changes along spanwise direction and chordwise direction,respectively,and it changes in both *** classical thin shell theory,the first and second fundamental forms of surface and von Karman geometric relationship are employed to derive the total potential energy and kinetic energy of the cantilever twisted plate,in which the centrifugal force potential due to high rotational speed is ***,according to the Rayleigh-Ritz procedure and applying the polynomial functions which satisfy the cantilever boundary conditions,the dynamic system expressed by equations of motion is reduced to an eigenvalue *** numerical simulation,the frequency curves and the mode shapes of the twisted plate can be obtained to reveal the internal connection between natural vibration and the parameters.A series of comparison studies are performed to verify the accuracy of the present formulation and calculations,in which compared data come from experimental,finite element method and theoretical calculation,*** influence of pre-twist angle,three different forms of thickness taper ratio and rotational speed on natural vibration,mode exchange and frequency veering phenomenon of the system is discussed in *** addition,the approach proposed here can efficiently extract analytical expressions of mode functions for rotating variable thickness cantilever twisted plate structures.

关键词： Porous cantilever twisted plate Variable thickness Natural vibration Frequency veering Mode exchange

稀土元素Er、yb和y掺杂ZrO_(2)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1期42卷 156-162页

作者：熊威任浩重庆交通大学航空学院重庆402247 重庆交通大学绿色航空技术研究院重庆401147

氧化锆具有声子能量低,介电常数高和带隙较宽等优良特性,并且立方相的氧化锆(cZrO_(2))透光率高,适合作为上转换发光材料的基质.采用基于密度泛函理论(DFT)的第一性原理平面波赝势法研究了稀土元素Er、yb和y掺杂cZrO_(2)的电子结构和光... 详细信息

氧化锆具有声子能量低,介电常数高和带隙较宽等优良特性,并且立方相的氧化锆(cZrO_(2))透光率高,适合作为上转换发光材料的基质.采用基于密度泛函理论(DFT)的第一性原理平面波赝势法研究了稀土元素Er、yb和y掺杂cZrO_(2)的电子结构和光学性质.计算结果显示,掺入y元素后,cZrO_(2)转变为直接带隙材料,继续掺入Er和yb原子后,费米能级移动到价带内,带隙显著减小.y和Er混掺后,增强了cZrO_(2)在近红外波段的吸收能力.继续掺入yb后,cZrO_(2)对近红外波段的吸收能力有了进一步地增加.

关键词：氧化锆第一性原理电子结构光学性质

维普期刊数据库博看期刊

Responses of terrestrial bryophytes to simulated climate change in a secondary evergreen broad-leaved forest in southern China

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2022年第5期33卷 1481-1492页

作者： Jiewei hao l.M.Chu School of life Sciences The Chinese University of Hong KongHong Kong SARChina 2 College of Ecology and Environment Hainan University58 Renmin RoadHaikou 570228China

Tropical regions are biodiversity hotspots and are well-suited to explore the potential influence of global climate change on forest ecosystems. Bryophytes have essential ecological functions in tropical forest ecosystems, but knowledge of the potential impact of global warming and possible changes in water availability patterns on terrestrial bryophytes is limited. We transplanted eight terres- trial moss species from two elevations (900 and 500 m) to warmer and drier elevations (500 and 100 m) during a halfyear observation period on Tai Mo Shan, southern China. The simulated climate change resulted in severely declined health status and marked decrease in growth of the trans- planted species when compared with their performance at the original elevations. Five of the eight selected species survived for six months after being transplanted to the warmer and drier lowlands, though their health status deteriorated severely. Sematophyllum subhumile , Pseudotaxiphyllum pohliaecarpum and Brachythecium buchananii were highly susceptible to changes in temperature and rainfall patterns and might be used as suitable bioindicators. As the tropics are expected to become hotter and drier, terrestrial mosses might be negatively affected or even be at risk of extinction. Bryophytes in the tropics could represent one of the best biological communities to reflect the direct adverse impact of climate change and provide early warning of the biological outcomes induced by ongoing climate crisis.

关键词： Bioindicator Bryophytes Climate change Secondary forest Terrestrial mosses

Unveiling the Initial Conditions of Open Star Cluster Formation

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第7期23卷 288-299页

作者： C.J.hao y.Xu l.G.Hou Z.H.lin y.J.li Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

Open clusters(OCs)are infrequent survivors of embedded clusters gestated in molecular *** to now,little is known about the initial conditions for the formation of ***,we studied this issue using high-precision astrometric parameters provided by Gaia data release *** statistics show that the peculiar motion velocities of OCs vary slightly from infancy to old age,providing a remarkable opportunity to use OCs to trace their *** a dynamical method,we derived the masses of the progenitor clumps where OCs were born,which have statistical characteristics comparable to previously known results for clumps observed in the ***,the masses of the progenitor clumps of OCs indicate they should be capable of gestating massive O-type *** fact,after inspecting the observed OCs and O-type stars,we found that there are many O-type stars in *** destructive stellar feedback from O-type stars may disintegrate the vast majority of embedded clusters,and only those sufficiently dense ones can survive as OCs.

关键词： Galaxy:stellar content (Galaxy:)open clusters and associations:general stars:formation stars:kinematics and dynamics