检索结果-南通市图书馆

An Analysis of the Fragmentation of Observing Time At the Muztagh-Ata Site

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第3期24卷 29-33页

作者： wen-bo gu Jing Xu guo-Jie Feng Xuan Zhang Le-Tian Wang Xin-Liang Wang Ali Esamdin Li-Xian Shen Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 83001lChina School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

Cloud cover plays a pivotal role in assessing observational conditions for astronomical *** for the fraction of observing time,its fragmentation also wields a significant influence on the quality of nighttime sky *** this article,we introduce the functionΓ∈[0,1],designed to comprehensively capture both the fraction of available observing time and its *** in situ measurement data gathered at the Muztagh-Ata site between 2017 and 2021,we showcase the effectiveness of our *** statistical result illustrates that the Muztagh-Ata site affords approximately 122 nights that were absolutely clear and 205 very good nights annually,corresponding toΓ≥0.9 andΓ≥0.36 respectively.

关键词： site testing-atmospheric effects-methods statistical

Network pharmacology-based exploration of molecular mechanisms underlying therapeutic effects of Jianpi Huatan Quyu recipe on chronic heart failure with spleen Qi deficiency syndrome

在线全文

学校读者我要写书评

暂无评论

World Journal of Cardiology 2024年第7期16卷 422-435页

作者： Si-Qi Li Dong-Yu Min Jun-wen Jiang Xiao-Ying Li Xu-Na Yang wen-bo gu Jia-Hui Jiang Li-Hao Chen Han Nan Ze-Yu Chen Second Department of Cardiology The Affiliated Hospital of Liaoning University of Traditional Chinese MedicineShenyang 110000Liaoning ProvinceChina

BACKGROUND Chronic heart failure is a complex clinical *** Chinese herbal compound preparation Jianpi Huatan Quyu recipe has been used to treat chronic heart failure;however,the underlying molecular mechanism is still not *** To identify the effective active ingredients of Jianpi Huatan Quyu recipe and explore its molecular mechanism in the treatment of chronic heart *** The effective active ingredients of eight herbs composing Jianpi Huatan Quyu recipe were identified using the Traditional Chinese Medicine Systems Pharmacology Database and Analysis *** target genes of chronic heart failure were searched in the Genecards *** target proteins of active ingredients were mapped to chronic heart failure target genes to obtain the common drugdisease targets,which were then used to construct a key chemical componenttarget network using Cytoscape 3.7.2 *** protein-protein interaction network was constructed using the String *** Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analyses were performed through the Metascape ***,our previously published relevant articles were searched to verify the results obtained via network *** A total of 227 effective active ingredients for Jianpi Huatan Quyu recipe were identified,of which quercetin,kaempferol,7-methoxy-2-methyl isoflavone,formononetin,and isorhamnetin may be key active ingredients and involved in the therapeutic effects of TCM by acting on STAT3,MAPK3,AKT1,JUN,MAPK1,TP53,TNF,HSP90AA1,p65,MAPK8,MAPK14,IL6,EGFR,EDN1,FOS,and other *** pathways identified by KEGG enrichment analysis include pathways in cancer,IL-17 signaling pathway,PI3K-Akt signaling pathway,HIF-1 signaling pathway,calcium signaling pathway,cAMP signaling pathway,NF-kappaB signaling pathway,AMPK signaling pathway,*** studies on Jianpi Huatan Quyu recipe suggested that this Chinese compound preparation can regulate the TNF-α,IL-6,MAPK

关键词： Jianpi Huatan Quyu recipe Traditional Chinese medicine Chronic heart failure Data mining Network pharmacology Bioinformatics Spleen Qi deficiency syndrome

Enantioselective synthesis of indenols via rhodium(III)-catalyze C–H activation/annulation of ketones with alkynes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： bo-bo Gou wen-Jie Shen Yuan-Jun Gao Qing gu Shu-Li You New Cornerstone Science Laboratory State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences

Molecular chirality is a cornerstone of modern chemistry and it has a profound impact on biological activity, chemical reactivity and physical property. Developing asymmetric synthesis methods to efficiently and precisely produce chiral molecules remains a challenging issue in organic chemistry. In recent years, transition-metal-catalyzed enantioselective C–H activation has emerged as an efficient strategy for the rapid access to valuable chiral compounds from readily available feedstocks in an atom-and step-economic manner. Here we report a rhodium(III)-catalyzed C–H activation/annulation of ketones with alkynes. This method features mild conditions, wide substrate scope, and perfect atom economy, affording a series of chiral tertiary indenols in excellent yields and enantioselectivity(up to 98% yield and 99% ee). Combined experimental and computational studies revealed the turnover-limiting step of the reaction and the origins of enantioselectivity and regioselectivity.

关键词：

Achieving further refinement of grain structure and improvement of mechanical properties in Al-12Si-4Cu-2Ni-1Mg alloy by Al-Ti-C-B master alloy addition and deep cryogenic treatment

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2025年第1期22卷 75-82页

作者： Lin-fei Xia wen-bo Li Zuo-shan Wei Yu-ying Wu Xiang-fa Liu China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China Shandong Key Laboratory of Advanced Aluminum Materials and Technology Binzhou Institute of TechnologyBinzhou 256600ShandongChina

Near-eutectic Al-Si alloys are widely used in automotive manufacturing due to their superior wear resistance and high temperature *** of high Si content,the grain refinement of near-eutectic Al-Si alloy has been a problem for many *** this study,the effect of deep cryogenic treatment(DCT)on the microstructure and mechanical properties of Al-12Si-4Cu-2Ni-Mg alloy with addition of Al-Ti-C-B master alloy was fully *** show that the average grain size of the alloy is greatly reduced from 0.92 mm to 0.50 mm,and the eutectic Si and Al7Cu4Ni precipitates are spheroidized and refined in Al-12Si-4Cu-2Ni-Mg after DCT for 24 h and aging *** these changes of microstructures result in a significant increment of about 22.5%in elongation and a slight enhancement of about 6.8%in tensile ***,the refinement of microstructure also significantly improves the fatigue life of the alloy.

关键词： deep cryogenic treatment near-eutectic Al-Si master alloy microstructure mechanical properties

Accumulation characteristics and fate modeling of phthalic acid esters in surface water from the Three Gorges Reservoir area,China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第3期149卷 46-56页

作者： Shuai Sun Bing Zhang Junjie Hu wen gu ZhenWang Deling Fan Feng Ge Lili Shi LeiWang Nanjing Institute of Environmental Science Ministry of Ecology and Environment of the People’s Republic of ChinaNanjing 210042China Key Laboratory of Pesticide Environmental Assessment and Pollution Control Ministry of Ecology and Environment of the People’s Republic of ChinaNanjing 210042China Solid Waste and Chemicals Management Center Ministry of Ecology and Environment of the People’s Republic of ChinaBeijing 100029China

Phthalic acid esters(PAEs)are a group of compounds widespread in the *** investigate the occurrence and accumulation characteristics of PAEs,surface water samples were collected from the Three Gorges Reservoir area,*** total concentrations of∑_(11)analyzed PAEs(11PAEs)in the collected water samples ranging from 197.7 to 1,409.3 ng/L(mean±IQR:583.1±308.4 ng/L).While DEHP was the most frequently detected PAE,DnBP and DnNP were the most predominant PAEs in the analyzed water samples with a mean contribution of 63.3%of the∑_(11)*** concentrations of the∑_(11)PAEs in the water samples from the upper reaches of the Yangtze River were significantly higher than those from themiddle *** better understand the transport and fate of the PAEs,seven detected PAEs were modeled by Quantitative Water Air Sediment Interaction(QWASI).The simulated and measured values were close for most PAEs,and differences are within one order of magnitude even for the worst *** all simulated PAEs,water and particle inflow were main sources in the reservoir,whereas water outflow and degradation in water were important removal *** contribution ratios of different sources/losses varied fromPAEs,depending on their *** calculated risk quotients of DnNP in the Three Gorges Reservoir area whether based onmonitoring or simulating results were all far exceeded the safety threshold value,implying the occurrence of this PAE compound may cause potential adverse effects for the aquatic ecology of the Three Gorges Reservoir area.

关键词： Phthalic esters Surface water Transport and fate Three Gorges Reservoir area Risk assessment

Two-dimensional lateral magnetic tunnel junction with ultrahigh tunneling magnetoresistance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2025年第2期18卷 958-964页

作者： Qiu-Qiu Li Zhi-Fu Duan wen-wen Liu Rong Yang bo Li Ke-Qiu Chen Changsha Semiconductor Technology and Application Innovation Research Institute College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China Research Institute of Hunan University in Chongqing Chongqing 401120China Shenzhen Research Institute of Hunan University Shenzhen 518063China

Giant tunneling magnetoresistance(TMR)has always been a pursuit in the research of magnetic tunnel junctions(MTJ).Two-dimensional(2D)magnetic materials have been used to construct lateral MTJ with high *** we investigated the crystal structure and magnetic property of CrSI monolayer,and found that it is a ferromagnetic semiconductor with a Curie temperature of about 180 *** CrSI monolayer with Li adsorption(Li-CrSI)show ferromagnetic half-metallic with a high Curie temperature of 300 *** we designed a lateral Li CrSI/CrSI/Li-CrSI monolayer *** TMR of the MTJs along b transport direction is 3 orders of magnitude times larger than that of the a transport direction,which should result from the different spin filtering ability along the two *** TMR of b transport direction in the MTJ is 7.67×10^(14),which is significantly higher than that of any reported lateral MTJs based on 2D *** results provide a promising avenue for designing lateral MTJs with giant TMR and high Curie temperature.

关键词： two-dimensional materials magnetic tunnel junctions CrSI monolayer tunneling magnetoresistance Li atom adsorption

Recycling technologies of spent lithium-ion batteries and future directions:A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学报 2025年第1期35卷 271-295页

作者： Xue-song GAO Meng WU guang-jin ZHAO Kun-hong gu Jia-jia WU Hong-bo ZENG wen-qing QIN Jun-wei HAN School of Minerals Processing&Bioengineering Central South UniversityChangsha 410083China Department of Chemical and Materials Engineering University of AlbertaEdmonton T6G 1H9Canada Electric Power Research Institute Henan Electric Power CompanySTATE GRID Corporation of ChinaZhengzhou 450052China

Lithium-ion batteries(LIBs)are the most popular energy storage devices due to their high energy density,high operating voltage,and long cycle ***,green and effective recycling methods are needed because LIBs contain heavy metals such as Co,Ni,and Mn and organic compounds inside,which seriously threaten human health and the *** this work,we review the current status of spent LIB recycling,discuss the traditional pyrometallurgical and hydrometallurgical recovery processes,and summarize the existing short-process recovery technologies such as salt-assisted roasting,flotation processes,and direct ***,we analyze the problems and potential research prospects of the current recycling process,and point out that the multidisciplinary integration of recycling will become the mainstream technology for the development of spent LIBs.

关键词： spent lithium battery short-process recycling secondary resources pretreatment metal recovery

Sunlight-induced Permanent Hair Dyeing

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 JOURNAL OF POLYMER SCIENCE 2025年第2期43卷 261-270页

作者： Zhang, Ting Liang, bo Zhang, Jian-Hua Yang, Lei Hu, Jun-Fei Li, Yi-wen Sichuan Univ Coll Polymer Sci & Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China Hubei Univ Automot Technol Sch Mat Sci & Engn Shiyan 442002 Peoples R China South China Univ Technol Sch Emergent Soft Matter Guangzhou 510640 Peoples R China

Hair coloring has emerged as an integral part of the cosmetic industry, particularly in response to the increasing global aging phenomenon. The natural melanin analog, polydopamine (PDA), has garnered considerable attention as an eco-friendly hair dye, and several kinds of polymerization ways of dopamine (DA) have been proposed including alkali catalysis, metal ion catalysis, strong oxidants, and enzyme-mediated oxidation reactions and polymerizations. Yet the controllability of polymerization and potential toxicity of involved metal ions are still in question. Inspired by the photoprotective mechanism in human skin, we have developed the melanin-inspired hair dyeing strategy that allowed for the in situ oxidative polymerization of DA under ultraviolet (UV) light. This polymerization was triggered by photobase generators (PBGs), a class of compounds that produced organic bases upon UV and sunlight irradiation. The resulting hair showed an adjustable color from light brown to black by tuning the ratio of DA and PBG (DA@PBG), the concentration of DA, and light exposure time. The dyed hairs showed excellent washing resistance and superior anti-static properties. Furthermore, Hair Color Spray DA@PBG also demonstrated a desirable hair dyeing effect and excellent biosecurity by simply spraying it on the hair under sunlight. This novel sunlight-induced method provided a new direction towards the preparation of natural hair dyes and could promote the development of green and safe hair dyes in colorful and brilliant artistic-grade hair coloring.

关键词： Polydopamine Melanin Polymerization Hair dye Photo-initiation

A single-pixel elemental imaging method using neutron-induced gamma-ray activation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2025年第1期36卷 1-12页

作者： Can Cheng Yong-Ji Xie Xun-Rong Xia Jia-Yu gu Dong Zhao Yi-Ze Chen Ai-Yun Sun Xu-wen Liang wen-Bao Jia Da-Qian Hei Department of Ionizing Radiation and Medical Engineering Jiangsu Institute of MetrologyNanjing 210023China Institute of Nuclear Analytical Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China China Nuclear Power Engineering Co. LtdBeijing 100840China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China

Neutron-induced gamma-ray imaging is a spectroscopic technique that uses characteristic gamma rays to infer the elemental distribution of an ***,this technique requires the use of large facilities to supply a high neutron flux and a time-consuming detection procedure involving direct collimating *** this study,a new method based on low neutron flux was proposed.A single-pixel gamma-ray detector combined with random pattern gamma-ray masks was used to measure the characteristic gamma rays emitted from the *** of the elemental distribution in the sample,comprising 30×30 pixels,were reconstructed using the maximum-likelihood expectation-maximization *** results demonstrate that the elemental imaging of the sample can be accurately determined using this *** proposed approach,which eliminates the need for high neutron flux and scanning measurements,can be used for in-field imaging applications.

关键词： Elemental imaging Neutron-induced gamma-ray activation Single-pixel imaging