检索结果-南通市图书馆

Interatomic Potentials for NiZr Alloys from Experimental and Ab initio Calculations

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

Chemical Research in Chinese Universities 2002年第1期18卷 38-41页

作者： TAN Kai, LIN Meng-hai , wang nan-qin and ZHANG Qian-er Department of Chemistry,Xiamen University,Xiamen 361005,P.R.China Xiamen Univ Dept Chem Xiamen 361005 Peoples R China

We applied an approach to the development of many-body interatomic potentials for NiZr alloys,gaining an improved accuracy and *** functional form of the potential is that of the embedded method,but it has been improved as follows. (1) The database used for the development of the potential includes both experimental data and a large set of energies of different structures of the alloys generated by Fab initio calculations. (2) The optimum parametrization of the potential for the given database is obtained by fitting. Using this approach we developed reliable interatomic potentials for Ni and Zr. The potential accurately reproduces basic equilibrium properties of the alloys.

关键词： Ab initio NiZr alloy Many-body interatomic potential

Application of carbon materials for Zn anode protection in aqueous Zn metal batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第10期43卷 4807-4843页

作者： Cui-qin Chao Yan-nan Li Yan Zhao College of Energy Materials and Chemistry Inner Mongolia University School of Physical Science and Technology Inner Mongolia University

Aqueous Zn metal batteries (AZMBs) have gained widespread attention due to their high theoretica specific capacity,good safety,and low *** Zn anodes suffer from serious problems of dendrites and side reactions,which should be solved by modifying the Zn anode (Zn host,protective layer),electrolyte,and *** materials with structurally tunable and physicochemical stability properties have been widely used in the study of Zn anode protection and have also been reviewed in the past ***,review reports on carbon-based Zn anodes for Zn anode protection from new perspectives are still urgently ***,the timeliness of the review reports is very valuable for researchers to timely and accurately understand the dynamics of the research ***,this review firs reports the significance of AZMBs and summarizes the current main challenges that should be solved for practical ***,the ways to construct long-life Zn anodes using carbon materials from the perspectives of modified carbon materials with gradient properties (gradient zincophilicity,gradient electrical conductivity,and multigradient deposition) as protective layers/hosts to guide Zn ions toward bottom-up gradient Zn deposition are *** addition,the recent advances of carbon materials for electrolyte and separator modifications are ***,the remaining challenges and future perspectives of carbon materials in AZMBs Zn anode protection are briefly outlined.

关键词： Anode protection Aqueous Zn battery Carbon Gradient deposition

A review on the multi-scaled structures and mechanical/thermal properties of tool steels fabricated by laser powder bed fusion additive manufacturing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1048-1071页

作者： Huajing Zong nan Kang Zehao qin Mohamed El Mansori Arts et Metiers Institute of Technology MSMPHESAM UniversitéChâlons-en-Champagne F-51006France Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege Station TX77843USA

The laser powder bed fusion(LPBF) process can integrally form geometrically complex and high-performance metallic parts that have attracted much interest,especially in the molds *** appearance of the LPBF makes it possible to design and produce complex conformal cooling channel systems in ***,LPBF-processed tool steels have attracted more and more *** complex thermal history in the LPBF process makes the microstructural characteristics and properties different from those of conventional manufactured tool *** paper provides an overview of LPBF-processed tool steels by describing the physical phenomena,the microstructural characteristics,and the mechanical/thermal properties,including tensile properties,wear resistance,and thermal *** microstructural characteristics are presented through a multiscale perspective,ranging from densification,meso-structure,microstructure,substructure in grains,to ***,a summary of tool steels and their challenges and outlooks are introduced.

关键词： additive manufacturing laser powder bed fusion tool steel multi-scaled structure mechanical properties thermal properties

Height and body mass index trajectories from 1975 to 2015 and prevalence of stunting,underweight and obesity in 2016 among children in Chinese cities:findings from five rounds of a national survey

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2024年第4期20卷 404-412页

作者： Xin‑nan Zong Hui Li Ya‑qin Zhang Department of Growth and Development Capital Institute of PediatricsBeijing 100020China

Background A more comprehensive assessment of growth and nutrition in children is required in China due to rapid socioeconomic *** aimed to investigate height and body mass index(BMI)trajectories from 1975 to 2015 and the prevalence of stunting and obesity in 2016 among children in Chinese *** A total of 904,263 children from birth to 6.9 years were collected from a series of nationally representative surveys in *** and BMI trajectories and prevalence of stunting,underweight,overweight and obesity were *** The average height level of Chinese urban children under 7 years presented a positive secular trend from 1975 to 2015;however,a slowing tendency occurred in 2005‒*** apparent increase was observed at the 5th,50th and 95th percentiles of BMI in urban children aged 3 years and older,with a more prominent increase at the 95th *** total prevalence of stunting and underweight under 7 years was 1.4%and 2.0%,*** total prevalence of overweight and obesity under 7 years was 12.6%and 4.3%,respectively,with 12.7%and 4.9%for boys,12.6%and 3.6%for girls,12.1%and 4.0%in urban areas and 13.1%and 4.5%in suburban rural *** The average height level of Chinese urban children has reached World Health Organization child growth standards since 2005 and presented a slowing tendency in secular trend in 2005‒*** attention and efforts and public health interventions should be urgently made to combat overweight and obesity among preschool children.

关键词： Body mass index Children Height Obesity Stunting

The Coarse l^(p)-Novikov Conjecture and Banach Spaces with Property(H)

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

Chinese Annals of Mathematics,Series B 2024年第2期45卷 193-220页

作者： Huan wang qin wang Research Center for Operator Algebras School of Mathematical SciencesEast China Normal UniversityShanghai 200241China Key Laboratory of MEA Ministry of Educationand Shanghai Key Laboratory of PMMPEast China Normal UniversityShanghai 200241China

In this paper,for 1

关键词： The coarse l^(p)-Novikov conjecture Banach spaces with Property(H) Coarse geometry K-Theory

An Icy Worlds life detection strategy based on Exo-AUV

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第11期67卷 3515-3535页

作者： Bin wang Hongde qin National Key Laboratory of Autonomous Marine Vehicle Technology Harbin Engineering University Shipbuilding Engineering College Harbin Engineering University

In the solar system, Icy Worlds such as Europa and Enceladus hold great potential for extraterrestrial life and may provide humanity an answer, within this century, to the age-old question of life beyond Earth. Exo-AUV technology shows promise in life detection in the icy shell, at the ice-water interface and on the seafloor of exo-ocean. Space agencies, including NASA and DLR, are enthusiastic about deploying Exo-AUVs to explore life in these regions. However, the where and how to find life, the technologies to be utilized and the goals to be achieved are crucial aspects for future Exo-AUV life detection missions on Icy Worlds. This study delves into a hypothetical mission of life detection on Europa, discussing science goals,detectable objects, potential regions and biogenic analysis for Icy Worlds. It proposes a life detection strategy for Icy Worlds based on Exo-AUVs, presents key contextual elements for Exo-AUV operations, outlines technological requirements for hull,payloads and autonomy, introduces the current state of Exo-AUV research and addresses existing challenges. This study also suggests a roadmap for conceptual development of Exo-AUV and a Concept of Operations for Multiple Exo-AUV System(ConOps for MEAS). This system aims to assist planetary scientists and astrobiologists in exploring Icy Worlds, identifying robust biosignatures and potentially discovering extant organisms, even prebiotic chemical systems.

关键词： Icy Worlds Europa Life detection Biological potential Exo-AUV

MECHANISM OF METHANOL DECOMPOSITION ON CLEAN AND OXYGEN-MODIFIED Fe,Cu SURFACES:BOND-ORDER CONSERVATION APPROACH

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 1993年第3期 185-194页

作者： wang nan-qin XIA Wen-Sheng ZHANG Qian-Er Department of Chemistry, Xiamen University Xiamen, Fujian 361005

Bond-order conservation-Morse potential （BOC-MP） approach hasbeen used to study the mechanism of methanol decomposition on the clean andoxygen-modified Fe（100）, Cu （100） surfaces. On the clean Cu （100） surfacemethanol was adsorbed in molecular forms and desorbed without dissociation,but on the clean Fe（100） surface it decomposed via a methoxy （CH3O） inter-mediate into carbon monoxide （CO） and hydrogen （H2） mainly, or into methyl（CH3） and hydroxyl （OH） species directly. The thermal stability of methoxyincreased in the presence of pre-adsorbed oxygen（O3）. Hollow site O3poisonedthe decomposition of methanol, but non-hollow site O3promoted the decomposi-tion of methanol into the methoxy, which decomposed and selectively led to theformation of formaldehyde （H2CO） on oxygen-modified Cu surfaces. The for-mation of formaldehyde via a disproportionation reaction of methoxy is also dis-cussed.

关键词： Fe MECHANISM OF METHANOL DECOMPOSITION ON CLEAN AND OXYGEN-MODIFIED Fe,Cu SURFACES OHC Cu

DECOMPOSITION OF METHANOL ON METAL SURFACES:BOND-ORDER CONSERVATION APPROACH

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 1993年第2期 100-108页

作者： XIA Wen-Sheng wang nan-qin ZHANG Qian-Er Department of Chemistry,Xiamen University,Xiamen,Fujian 361005

Bond-Order Conservation-Morse Potential（BOC-MP）approach hasbeen used to study the decomposition of methanol（CH3OH）onFe（111）,Pd（111）,Pt（111）and Cu（111）*** result shows:The scission of O-H,C-O bond in methanol occurs on Fe,but O-H bond is activated on Cu,andO-H,C-O bonds are activated on Pd,Pt.O-H bond is broken into methoxy（CH3Os）,up to the final product（CO）.C-O bond is broken into(CH2.+H2O3),then leads to the formation of hydrogenated species CH3.2,CH4.8on Ptand Pal,while broken into either(CH2,s+H2Os)or(CH3,s+OHs)on *** selectivity of methanol decomposition and the thermal stability of methoxyincrease in the order of Fe更多还原AbstractFilter('ChDivSummary', 'ChDivSummaryMore', 'ChDivSummaryReset');

关键词： Pt

Banxia Xiexin Decoction Alleviated Cerebral Glucose Metabolism Disorder by Regulating Intestinal Microbiota in APP/PS1 Mice

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第8期30卷 701-712页

作者： GAO Chen-yan qin Gao-feng ZHENG Ming-cui TIAN Mei-jing HE Yan-nan wang Peng-wen Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing Dongzhimen HospitalBeijing University of Chinese MedicineBeijing100700China Neurology Department Binzhou Medical University HospitalBinzhouShandong Province256603China

Objective To identify whether Banxia Xiexin Decoction(BXD)alleviates cerebral glucose metabolism disorder by intestinal microbiota regulation in APP/PS1 *** Forty-five 3-month-old male APP/PS1 mice were divided into 3 groups using a random number table(n=15 per group),including a model group(MG),a liraglutide group(LG)and a BXD group(BG).Fifteen 3-month-old male C57BL/6J wild-type mice were used as the control group(CG).Mice in the BG were administered BXD granules by gavage at a dose of 6 g/(kg·d)for 3 months,while mice in the LG were injected intraperitoneally once daily with Liraglutide Injection(25 nmol/kg)for 3 ***,liquid chromatography with tandem-mass spectrometry was used to analyze the active components of BXD granules and the medicated serum of ***,the cognitive deficits,Aβpathological change and synaptic plasticity markers,including synaptophysin(SYP)and postsynaptic density protein 95(PSD95),were measured in APP/PS1 *** glucose uptake was detected by micropositron emission *** microbial constituents were detected by 16S rRNA *** levels of intestinal glucagon-like peptide 1(GLP-1)and cerebral GLP-1 receptor(GLP-1R),as well as the phosphoinositide-3-kinase/protein kinase B/glycogen synthase kinase-3β(PI3K/Akt/GSK3β)insulin signaling pathway were determined by immunohistochemical(IHC)staining and Western blot analysis,*** BXD ameliorated cognitive deficits and Aβpathological features(P<0.01).The expressions of SYP and PSD95 in the BG were higher than those in the MG(P<0.01).Brain glucose uptake in the BG was higher than that in the MG(P<0.01).The intestinal microbial composition in the BG was partially *** levels of intestinal GLP-1 in the BG were higher than those in the MG(P<0.01).Compared with the MG,the expression levels of hippocampal GLP-1R,Akt,PI3K and p-PI3K in the BG were significantly increased(P<0.01),while the levels of GSK3βwere reduced(P<0.01).Conclusion BXD

关键词： Banxia Xiexin Decoction Alzheimer's disease intestinal microbiota glucagon-like peptide 1 cerebral insulin resistance phosphoinositide-3-kinase/proteinkinase B/glycogen synthase kinase-3β Chinese medicine