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Covalent triazine frameworks modified by ultrafine Pt nanoparticles for efficient photocatalytic hydrogen production

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Nano Research 2024年第6期17卷 4908-4915页

作者： Xu Han Xueying Ge Wen-Wen He Wangwang Shen Tao Zhou jian-Sen Wang {1.-Lin Zhong Abdullah {2.l-Enizi Ay{2.n Nafady Shengqian {2. School of Chemistry and Life Science Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012China Laboratory of Theoretical and Computational Chemistry Institute of Theoretical ChemistryCollege of ChemistryJilin UniversityChangchun 130021China Department of Chemistry University of North Texas1508 W.Mulberry St.DentonTX 76201USA Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

Pt nanoparticles(PtNPs)as active species have always been considered as one of the best semiconductor materials for photocatalytic hydrogen *** this study,a Schottky heterojunction has been successfully constructed by evenly loading ultrafine PtNPs onto a triazine-based covalent organic frameworks(COFs).This strategy maintained the high activity of these ultra-small PtNPs while maximizing the utilization of the Pt active *** fabricated PtNPs@covalent triazine-based framework-1.CTF-1.composite accomplished a significantly high rate of hydrogen evolution(2..0 mmol·g^(−1.·h^(−1.,apparent quantum efficiency(AQE)=7.6%,atλ=450 nm)with 0.40 wt.%Pt loading,giving rise to a 44-fold-increase in the efficiency of the photocatalytic hydrogen production compared to the pristine *** calculations revealed that the strong electron transfer(Q(Pt)=−0.72. qe,in the analysis of Bader charge,Q(Pt)is the charge quantity transferred from Pt cluster to CTF-1.and qe is the unit of charge transfer quantity)between PtNPs and CTF-1.triggers a strong interaction,which makes PtNPs being firmly attached to the structure of CTF-1.thereby enabling high stability and excellent hydrogen production ***,the hydrogen binding free energy(ΔGH*)of PtNPs@CTF-1.is much lower than that of the unmodified CTF-1.leading to a much lower intermediate state and hence a significant improvement in photocatalytic *** overall findings of this work provide a new platform to incorporate metallic NPs into COFs for the design and fabrication of highly efficient photocatalysts.

关键词： Pt nanoparticles covalent triazine-based framework-1.CTF-1. photocatalysts hydrogen evolution reaction

Correlation of Behavior Changes and BOLD Signal in Alzheimer-like Rat Model

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Acta Biochimica et Biophysica Sinica 2004年第12期36卷 803-810页

作者： Zheng-Hui HU#, Xiao-Chuan WANG1#, Li-Yun LI3, mai-Li LIU3, rong LIU1, Zhiqun LING1, Qing TIAN1, Xiao-Wei TANG, Yi-Gen WU2., and {2.-Zhi WANG1* Department of Physics and Bio-X disciplinary Laboratory, Zhe{2.g University, Hangzhou 31002.,china 1 Department of Pathophysiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, china 2.6} of High energy Physics and Key Laboratory of Nuclear Analysis Techniques, Chinese Academy of Sciences, P.O. Box 918, Beijing 100039, china 3Wuhan institute of Physics and mathematics, State Key Laboratory of magnetic Resonance and atomic and Molecular Physics, Chinese Academy of Sciences, Wuhan 430071, china Department of Physics and Bio-X disciplinary Laboratory Zhejiang UniversityHangzhou 310027China Department of Pathophysiology Tongji Medical College Huazhong University of Science and TechnologyWuhan 430030 China Wuhan institute of Physics and {1.the{1.tics State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Chinese Academy of SciencesWuhan 430071 China institute of High {1. Physics and Key Laboratory of Nuclear Analysis Techniques Chinese Academy of SciencesP.O. Box 918 Beijing 100039 China

To explore a potential means for the early diagnosis of Alzheimer disease, we studied the relationship of resting T2. signal and tau hyperphosphorylation/spatial memory deficit. The rat model with tau hyperphosphorylation and spatial memory deficit was established by bilateral hippocampi injection of isoproterenol (IP). Then, the correlative alteration between resting T2. signal and spatial memory retention was assessed with blood oxygenation level dependent (BOLD) functional magnetic resonance imaging (fMRI) study and Morris Water maze test, and Western blot was employed to confirm tau hyperphosphorylation. The analysis showed following results. (1. Tau phosphorylation at Ser396/Ser404 and Ser1.9/Ser2.2.was signifi- cantly increased in IP-injected rats as detected by PHF-1.and tau-1. respectively. (2. An AD-like spatial memory retention disturbance was induced at 2. h after isoproterenol injection. (3) A sensitivity threshold of resting T2. signal intensity, which separated the IP-treated rats from vehicle control, was obtained by applying linear regression analysis, and an estimated sensitivity statistical threshold was at 32.62. These results suggest that resting T2. signal may serve as a noninvasive quantitative marker in predicting AD-like spatial memory deficits and tau hyperphosphorylation.

关键词： Alzheimer disease (AD) functional magnetic resonance imaging (fMRI) isoproterenol (IP) Morris Water maze diagnosis

Microscopic Optical Potential in Nucleus-Nucleus Scattering

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Microscopic Optical Potential in Nucleus-Nucleus Scattering

Toxicological Evaluation of Chicken-Breast Meat with High-Dose Irradiation

2.07年全国核反应会暨生物物理与核物理学科交叉前沿研讨会

作者： Yinqun ma {1. {2. zhongyu ma (china institute of atomic energy,Beijing,P.R,of china)

A parameter free microscopic optical potential of nucleus-nucleus interaction is presented by a folding method with the isospin dependent complex nucleon-nucleus optical potential, which is calculated in the framework of the Dirac-Bruecker-Hartree-Fock approach. The elastic scattering data of He at *** on C target are analyzed within the standard optical model. To take account of the breakup effect of He in the reaction an

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Journal of Integrative Agriculture 2012年第12期11卷 2088-2096页

作者： ZHU Jia-ting FENG Min YAN jian-min LIU Chun-quan HA Yi-ming GAO Mei-xu YANG Ping WANG Zhi-dong WANG De-ning LI Shu-{1. GU Gui-qiang institute of {1. {2. in Application for Agriculture Jiangsu Academy of Agricultural Sciences institute of Farm Product Processing Jiangsu Academy of Agricultural Sciences institute of Agro-Products Processing Science&Technology Chinese Academy of Agricultural Sciences

In this paper, toxicity and safety of high-dose irradiated chicken-breast meat were evaluated. For assays of acute toxicity, genetic toxicity, and sub-chronic toxicity, ames test, mice bone marrow erythrocyte micronucleus, and mice sperm abnormality were performed. The results showed that, in the acute oral toxicity tests, median lethal dose （more than {2. 000 mg kg-~） in male and female ICR mice showed no toxicological signs. For subacute 30-d oral toxicology of irradiated chicken-breast meat with dose of {2., {2. and 2. kGy in both male and female SD rats, no noticeable toxicological effects were observed. It is concluded that chicken-breast meat with high-dose irradiation has no acute toxicity and no genotoxicity, nor harmful effects on the animal body at the tested dosage range. Therefore, high-dose irradiated chicken-breast meat is safe for pet consumption.

关键词： toxicological assessment chicken-breast meat irradiated high dose

Mechanism of photon-induced performance changes in silicon heterojunction solar cells

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Science china {1.terials 2024年第9期67卷 2873-2879页

作者： Qi Deng Haoran Ye Shenglei Huang Zehua Sun Yanyun Yang Lei Li Zhu ma {1. Su Wei Long Fangdan {2.g Heng Guo Guoqiang Xing Wenzhu Liu {2. Yu School of New energy and {1.terials Southwest Petroleum UniversityChengdu610500China Shanghai institute of Microsystem and Infor{1.tion Technology Chinese Academy of Sciences(CAS)Shanghai201800China Tongwei Solar(Chengdu)Ltd. Chengdu600200China School of Physics and Electronical Science Chuxiong Normal UniversityChuxiong675000China School of Physical Science and Technology ShanghaiTech UniversityShanghai201210China Tianfu Yongxing Laboratory Chengdu610213China

Short-wavelength ultraviolet(UV)photons adversely affect hydrogenated amorphous silicon thin films,as well as on silicon heterojunction(SHJ)solar cells and *** research examines the impact and mechanisms of photon-induced performance *** A exposure disrupts Si-H bonds,significantly reducing hydrogen content in both intrinsic and doped hydrogenated amorphous silicon(a-Si:H)*** disruption impairs the interface passivation effect,leading to the degradation of SHJ solar cells and modules,primarily indicated by a decrease in open-circuit voltage(V_(oc))and fill factor(FF).UV irradiation from the front side of SHJ solar cells reduces V_(oc)and FF by {2.38%and 2.2.%,respectively,resulting in a 2.2.%efficiency *** irradiated from the backside show decreases in V_(oc)and FF of approximately {2.96%and 2.73%,respectively,leading to an overall efficiency reduction of approximately 3.58%.However,subsequent light-soaking increases V_(oc)and FF by approximately 0.96%and {2.37%,respectively,for frontside-irradiated cells,achieving an overall efficiency improvement of approximately 2.5{2..Thus,light-soaking effectively recovers performance losses caused by UV irradiation in SHJ solar *** research clarifies the mechanisms influencing the performance of a-Si:H thin films,SHJ solar cells,and modules under UV irradiation and light-soaking,offering significant contributions towards the development of highly efficient and reliable SHJ devices.

关键词： silicon solar cells heterojunction UV irradiation light soaking hydrogen content

Stepped-up development of accelerator mass spectrometry method for the detection of ^(60)Fe with the HI-1. tandem accelerator

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Nuclear Science and Techniques 2024年第4期35卷 136-143页

作者： Yang Zhang Sheng-Quan Yan Ming He Qing-Zhang Zhao Wen-Hui Zhang Chao-Xin Kan jian-Ming Zhou Kang-Ning Li Xiao-Fei Wang jian-Cheng Liu Zhao-Hua Peng Zhuo Liang Ai-Ling Li jian Zheng Qi-Wen Fan Yun-Ju Li You-Bao Wang Zhi-Hong Li Yang-Ping Shen Ding Nan Wei Nan Yu-Qiang Zhang Jia-Ying-Hao Li Jun-Wen Tian jiang-Lin Hou Chang-Xin Guo Zhi-Cheng Zhang Ming-Hao Zhu Yu-Wen Chen Yu-Chen jiang Tao Tian Jin-Long ma Yi-Hui Liu Jing-Yu Dong Run-Long Liu Mei-Yue-Nan ma Yong-Shou Chen Wei-Ping Liu Bing Guo china {1. of {2. energy P.O.Box 275(10)Beijing 102413China College of Science Southern University of Science and TechnologyShenzhen 518055China School of Physics Xi’an Jiaotong UniversityXi’an 710049China

The Moon provides a unique environment for investigating nearby astrophysical events such as *** samples retain valuable information from these events,via detectable long-lived“fingerprint”radionuclides such as^(60)*** this work,we stepped up the development of an accelerator mass spectrometry(AMS)method for detecting^(60)Fe using the HI-{2.tandem accelerator at the china institute of atomic energy(CIAE).Since interferences could not be sufficiently removed solely with the existing magnetic systems of the tandem accelerator and the following Q3D magnetic spectrograph,a Wien filter with a maximum voltage of±60 kV and a maximum magnetic field of 0.3 T was installed after the accelerator magnetic systems to lower the detection background for the low abundance nuclide^(60)Fe.A {2.m thick Si_(3)N_(4) foil was installed in front of the Q3D as an energy *** particle detection,a multi-anode gas ionization chamber was mounted at the center of the focal plane of the ***,an^(60)Fe sample with an abundance of {2.{2.5×{2.^(-{2.)was used to test the new AMS *** results indicate that^(60)Fe can be clearly distinguished from the isobar^(60)*** sensitivity was assessed to be better than 4.3×{2.^(-{2.)based on blank sample measurements lasting 5.8 h,and the sensitivity could,in principle,be expected to be approximately 2.5×{2.^(-{2.)when the data were accumulated for {2.0 h,which is feasible for future lunar sample measurements because the main contaminants were sufficiently separated.

关键词： Accelerator mass spectrometry Wien filter Isobar separation Supernovae Chang'e-5 lunar samples

Modulation of d-orbital to realize enriched electronic cobalt sites in cobalt sulfide for enhanced hydrogen evolution in electrocatalytic water/seawater splitting

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Rare Metals 2024年第2期43卷 511-521页

作者： jian-Peng Sun Yu Zheng Zi-Sheng Zhang Xiang-Chao Meng Zi-Zhen Li Key Laboratory of marine Chemistry Theory and Technology(Ministry of Education) College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao266100China Shanxi institute of {1. Taiyuan030600China Department of Chemical and Biological Engineering Faculty of EngineeringUniversity of OttawaOttawaONK1N6 N5Canada

Herein,a novel single-atomic Pt doping and interface-rich CoS/Co(OH)_(2.(Pt-CoS/Co(OH)_(2./C)electrocatalyst has been successfully *** from precise regulation of d-orbital electronic structure modulation on Co site,Pt-CoS/Co(OH)_(2./C exhibited re{1.rkable HER activity and high stability for hydrogen evolution in splitting both water(73 mV@1. {1.·cm^(−2.) and seawater(87 mV@1. {1.·cm^(−2.).Notably,atomic Pt doping was introduced into CoS/Co(OH)_(2.,which could produce local unbalanced Coulombic force and significantly increased the number of S vacancies,and then expose abundant Co ***,Co(OH)_(2. in Pt-CoS/Co(OH)_(2./C could act as the adsorption sites for H_(2.O in hydrogen evolution reaction *** functional theory results also proved that atomic Pt doping,S vacancies and Co(OH)_(2. coupling could result in the for{1.tion of enriched electronic Co sites and optimize d_(z2. orbital electronic structure,and then realize the depth upward shift of d-band center and enhance the adsorption of H*on Co sites.

关键词： Electrocatalysts Hydrogen evolution reaction Pt-CoS/Co(OH)_(2. d-band center Electronic structure Water/seawater electrolysis

High-spin structures in the 1.9Lu nucleus

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High-spin structures in the 159Lu nucleus

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： Li Cong-Bo~(1.2.1.) Li Xian-Feng~(1.2.) ma Ying-Jun~1.Wu Xiao-Guang~({1.)) Sheng Hai-Qing~1.Zhai jian~1.Zhao Yan-Xin~1.Liu Gong-Ye~1.Li Li~1.Zhu Li-Hua~2.He Chuang-Ye~2.Liu Ying~2.Hao Xin~2.Li Xue-Qin~2.1.Department of Physics,Jilin University,Changchun 1.002.,Peoples Republic of china) 2.china institute of atomic energy,Beijing 102.13.Peoples Republic of china)

High-spin states in Lu were populated by fusion-evaporation reaction Sm(F,4n) at 1.6MeV. The level scheme for Lu is established up to spin61.2.with the addition of about 2. new *** possible configuration of the update... 详细信息

关键词： High-spin states quasiparticle configurations

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低温设备热应力模拟分析

山东化工 2024年第8期53卷 232-235页

作者：马建中国原子能科学研究院北京102413

低温精馏系统通过同位素组分富集,将目标组分从原料气中分离出来。低温精馏塔外部与大气环境接触,内部流体与塔体对流换热,因此整个换热过程引起的热量损失和热应力大小是验证结构设计合理性的关键。本文利用模拟软件,通过对连接冷凝器... 详细信息

低温精馏系统通过同位素组分富集,将目标组分从原料气中分离出来。低温精馏塔外部与大气环境接触,内部流体与塔体对流换热,因此整个换热过程引起的热量损失和热应力大小是验证结构设计合理性的关键。本文利用模拟软件,通过对连接冷凝器和塔节的真空过渡箱的热分析,获得连接箱处的温度梯度以及热量损耗,并进行温差应力和机械应力的耦合应力分析,评定连接箱的应力强度,确定强度设计的合理性。通过温度线性化处理和热损耗计算分析,提出较优化的改进措施,并对其进行热分析,评定热损耗,验证改进结构的合理性。

关键词：低温精馏热分析耦合分析热损耗优化