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An improved bound on accelerated light dark matter

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Science china.Physics,Mechanics & Astronomy) 2024年第2期67卷 105-118页

作者： Liangliang su Lei Wu Bin Zhu department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China School of Physics Yantai UniversityYantai 264005China

Light(sub-GeV)dark matter has gained increasing interest in terms of direct *** dark matter is a promising candidate that can generate detectable nuclear recoil energy within the sub-GeV *** of the large kinetic energy,its interactions with the nucleus are predominantly governed by inelastic scattering,including quasi-elastic and deep inelastic *** this work,we calculated the inelastic effects in dark matter-Earth scattering mediated by a vector *** analysis revealed that the impact of inelastic scattering relies on the mediator mass and the kinetic energy spectrum of dark *** results exhibited considerable disparity:the upper bounds of the exclusion limit for the spin-independent cross-section between accelerated dark matter and nuclei via a heavy mediator differ by several tens of times when inelastic scattering is considered.

关键词： accelerated dark matter inelastic scattering direct detection experiment

Hydroxylated metal–organic-layer nanocages anchoring single atomic cobalt sites for robust photocatalytic CO_(2) reduction

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Nano Research 2024年第4期17卷 2410-2419页

作者： Weiyi Pan Zhihe Wei Yanhui su Yuebin Lian Zhangyi Zheng Huihong Yuan Yongze Qin Xulan Xie Qianqian Bai Zhenyang Jiao Wei hua Jinzhou Chen Wenjun Yang Zhao Deng Yang Peng Soochow Institute for Energy and Materials Innovations College of EnergySoochow UniversitySuzhou 215006China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006China School of Photoelectric Engineering Changzhou institute of technologyChangzhou 213032China Jiangsu Key Laboratory for Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123China

Assembly of two-dimensional(2D)metal–organic layers(MOLs)based on the hard and soft acid–base theorem represents an exquisite strategy for the construction of photocatalytic platforms in virtue of the highly exposed active sites,much improved mass transport,and greatly elevated ***,nanocages composed of MOLs are produced for the first time through a cosolvent approach utilizing zirconium-based UiO-66-(OH)2 as the structural *** endow the catalytic activity for CO_(2) conversion,single atomic Co^(2+)sites are appended to the Zr-oxo nodes of the MOL cages,demonstrating a remarkable CO yield of 7.74 mmol·g^(-1)·h^(-1) and operational stability of 97.1%product retention after five repeated *** an outstanding photocatalytic performance is mainly attributed to the unique nanocage morphology comprising enormous 2D nanosheets for augmented Co^(2+)exposure and the abundant surface hydroxyl groups for local CO_(2) *** work underlines the tailoring of both metal–organic framework(MOF)morphology and functionality to boost the turnover rate of photocatalytic CO_(2) reduction reaction(CO_(2)RR).

关键词： photocatalytic CO_(2) reduction metal–organic layer nanocage single-atom catalyst co-catalyst

HORMANDER MULTIPLIER THEOREM ON su(2)

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Chinese Annals of mathematics,Series B 1995年第1期16卷 103-108页

作者： FAN DASHAN XU ZEngFU(department of mathematics, Auhui universityt Hefei 230039, china.) AUHUI UNIV DEPT MATHHEFEI 2300039PEOPLES R CHINA

A boundedness criterion is set up for some convolution operators on a compact Lie *** this criterion a Hormander multiplier theorem is proved in the Hardy spaces on su(2).

关键词： Hormander multiplier theorem H￣P spacess Atomic decomposition Special unitary group.

Serum bile acid and unsaturated fatty acid profiles of non-alcoholic fatty liver disease in type 2 diabetic patients

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World Journal of Diabetes 2024年第5期15卷 898-913页

作者： su-su Feng Si-Jing Wang Lin Guo Pan-Pan Ma Xiao-Long Ye Ming-Lin Pan Bo Hang Jian-hua Mao Antoine M Snijders Yi-Bing Lu Da-Fa Ding department of Endocrinology The Second Affiliated Hospital of Nanjing Medical UniversityNanjing 210011Jiangsu ProvinceChina Biological Systems and Engineering Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720United States

BACKGROUND The understanding of bile acid(BA)and unsaturated fatty acid(UFA)profiles,as well as their dysregulation,remains elusive in individuals with type 2 diabetes mellitus(T2DM)coexisting with non-alcoholic fatty liver disease(NAFLD).Investigating these metabolites could offer valuable insights into the pathophy-siology of NAFLD in *** To identify potential metabolite biomarkers capable of distinguishing between NAFLD and *** A training model was developed involving 399 participants,comprising 113 healthy controls(HCs),134 individuals with T2DM without NAFLD,and 152 individuals with T2DM and *** validation encompassed 172 *** patients were divided based on liver fibrosis *** analytical approach employed univariate testing,orthogonal partial least squares-discriminant analysis,logistic regression,receiver operating characteristic curve analysis,and decision curve analysis to pinpoint and assess the diagnostic value of serum *** Compared to HCs,both T2DM and NAFLD groups exhibited diminished levels of specific *** UFAs,particular acids exhibited a positive correlation with NAFLD risk in T2DM,while theω-6:ω-3 UFA ratio demonstrated a negative *** ofα-linolenic acid andγ-linolenic acid were linked to significant liver fibrosis in *** validation cohort substantiated the predictive efficacy of these biomarkers for assessing NAFLD risk in T2DM *** This study underscores the connection between altered BA and UFA profiles and the presence of NAFLD in individuals with T2DM,proposing their potential as biomarkers in the pathogenesis of NAFLD.

关键词： Bile acid Non-alcoholic fatty liver disease Type 2 diabetes mellitus Unsaturated fatty acid

Application of Soliton Theory to the Construction of Isometric Immersions of M^(n_1) (c_1)×M^(n_2) (c_2) into Constant Curvature Spaces M^n (±1)

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Acta Mathematica Sinica,English Series 2002年第4期18卷 765-778页

作者： Jian hua CHEN department of mathematics. Peking university, beij.ng 100871. P. R. china.department, of mathematics, Armored Force Engineering Institute, beij.ng 100072, P. R. china department of mathematics Peking University Beijing P. R. China department of mathematics Armored Force Engineering Institute Beijing P. R. China

In this paper, we apply the soliton theory to the case of isometric immersion in differential geometry and obtain a family of isometric immersions from M^(n1) (c_1)×M^(n2)(c_2) to space forms M^n(c) by introducing 2-... 详细信息

关键词： Soliton theory Isometric immersion Riemaniann product

Toeplitz Operators on Dirichlet Spaces

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Acta Mathematica Sinica,English Series 2001年第4期17卷 643-648页

作者： Yu Feng LU Shun hua suN department of Applied mathematics, Dalian university of Technology, Dalian 116024, P. R. china.department of mathematics, Sichuan university, Chengdu 610064, P. R. china.department of mathematics, Sichuan university, Chengdu 610064, P. R. china department of Applied mathematics Dalian University of Technology Dalian 116024 P. R. China department of mathematics Sichuan University Chengdu 610064 P. R. China

In this paper we study Toeplitz operators on Dirichlet spaces and describe the boundedness and compactness of Toeplitz operators on Dirichlet spaces. Meanwhile, we give density theorems for Toeplitz operators on Diric... 详细信息

关键词： Dirichlet space Toeplitz operator Compact operator Strong operator topology

Preparation of PVA/GO/h-BN Janus Film with High Thermal Conductivity and Excellent Flexibility via a Density Deposition Self-assembly Method

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Chinese Journal of Polymer Science 2024年第8期42卷 1217-1226页

作者： Fang-hua Luo Zhi-Tao Dong Guo-hua Chen Chen Ma huai-Yuan Wang College of Chemistry and Chemical Engineering Northeast Petroleum UniversityDaqing 163318China College of Materials Science and Engineering Huaqiao UniversityXiamen 361000China School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering Tianjin UniversityTianjin 300350China

Janus films with asymmetric physical/chemical properties have attracted con siderable attention due to their promising applications in personal thermal management,electronic skin s,sensors,actuators,***,traditional methods for fabricating Janus films conventionally need the assistance of an interface or auxiliary equipment,which are usually complex and ***,flexible poly(vinyl alcohol)(PVA)/graphene oxide(GO)/h-BN(recorded as PVA/GO/h-BN)Janus films with thermally,optically,and electrically anisotropic properties are fabricated by a simple density deposition self-assem bly method,which just utilizes the density difference between GO and h-BN during water *** results show that the two sides of the acquired Janus films have obvious asymmetric *** the original state of the PVA/GO/h-BN Janus films,the thermal conductivity of the GO side(10.06 W·m^(-1)·K^(-1))is generally lower than that of the h-BN side(10.48W·m^(-1)·K^(-1)).But after GO is reduced,the thermal conductivity of the rGO side reaches 12.17 W·m^(-1)·K^(-1),surpassing that of the h-BN *** addition,the relative reflectance of the h-BN side of Janus film is also significantly higher than that of the rGO side,and the su rface resistance difference between the two sides is about 4 orders of *** prepared PVA/GO/h-BN Janus films show great application potential in human thermal management,light conversion switches,and electronic *** study provides a simple and versatile strategy for fabricating Janus films with multifunctional(such as thermal,optical,and electrical)anisotropies.

关键词： Janus films PVA/GO/h-BN Density deposition self-assembly method

SHAPE OF POLYMER CHAINS ON A TETRAHEDRAL LATTICE

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Chinese Journal of Polymer Science 2000年第5期18卷 419-422页

作者： Jian-hua huang Me+ng-bo Luo Wen-hua Jiang Shi-jun Han department of Chemistry, Zhejiang university, Hangzhou 310027, china.department of Physics, Zhejiang university, Hangzhou 310027, china 清华大学北京 100084

The shape of unperturbed polymer chains was studied using the Monte Carlo technique on a tetrahedral lattice. The asphericity A, the ratios / and / were calculated for different Values of polymer chain length n, conformational energy epsilon (epsilon greater than or equal to 0) and temperature T. The asphericity A decreases with the increase of chain length and tends to reach its limiting value rapidly with the decrease of gamma (gamma = epsilon/k(B)T). For large n, A is about 0.525 +/- 0.005, the ratios / and / are about 2.7 and 12.0, respectively, and are almost independent of gamma, but for short chains, they depend on gamma.

关键词： shape polymer chain Monte Carlo technique

A novel synthetic route for LiFePO_4/C cathode materials by addition of starch for lithium-ion batteries

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Chinese Chemical Letters 2007年第2期18卷 237-240页

作者： Shao hua Luo, Zi Long Tang, Jun Biao Lu, Zhong Tai Zhang State Key Laboratory of New Ceramics and Fine Processing, department of Materials Science and Engineering, tsinghua university, beij.ng 100084, china.Graduate School at Shenzhen, tsinghua university, Shenzhen 518055, china State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China

LiFePO4/Carbon composite cathode material was prepared using starch as carbon source by spray-pelleting and subsequent pyrolysis in N2. The samples were characterized by XRD, SEM, Raman, and their electrochemical performance was investigated in terms of cycling behavior. There has a special micro-morphology via the process, which is favorable to electrochemical properties. The discharge capacity of the LiFePO4.C composite was 170 mAh g-1, equal to the theoretical specific capacity at 0.1 C rate. At 4 C current density, the specific capacity was about 80 mAh g-1, which can satisfy for transportation applications if having a more flat discharge flat.

关键词： Lithium-ion batteries Cathode material Carbon coated LiFePO4 Spray-pelleting