检索结果-南通市图书馆

High-efficiency trace Na extraction from crystal quartz ore used for fused silica-——A pretreatment technology

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1075-1086页

作者： Min Lin Zhen-yu Pei yuan-yuan Liu Zhang-jie Xia kang Xiong Shao-min lei En-wen Wang School of Resources and Environmental Engineering Wuhan University of Technology School of Resources and Environmental Engineering Anshun University

Trace Na sources, extraction dynamics of trace Na, and influences of calcination temperature on quartz lattice, fluid inclusions, and muscovite were studied in detail herein for trace Na extraction from the quartz ore with water leaching at 90℃. Experimental results suggested that the trace Na sources included quartz lattice, fluid inclusions, and muscovite. The extraction rate of the trace Na in quartz ores can reach 31.0wt% after calcination at 900℃ for 5 h and water leaching at 90℃ for 24 h. The extraction process consisting of the dissolution of unfree Na and diffusion of free Na was dominated by calcination temperature. Calcination at 900℃ for 5 h was effective for extraction of the trace Na in fluid inclusions and muscovite. The extraction of the trace Na was mainly affected by the decrepitation of fluid inclusions when the calcination temperature ranged from 400 to 600℃ and by the damage of muscovite when the calcination temperature ranged from 600 to 900℃. Based on the extraction rates at different calcination temperatures, approximately 20.1wt% of the trace Na occurred in fluid inclusions, approximately 10.9wt% existed in muscovite, and 69.0wt% mainly occurred in quartz lattice.

关键词： trace sodium extraction quartz ore fluid inclusion muscovite decrepitation calcination water leaching

OPTIMAL APPROXIMATE SOLUTION OF THE MATRIX EQUATION AXB = C OVER SYMMETRIC MATRICES

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2007年第5期25卷 543-552页

作者： Anping Liao yuan lei College of Mathematics and Econometrics Hunan University Changsha 410082 China

Let SE denote the least-squares symmetric solution set of the matrix equation A×B = C, where A, B and C are given matrices of suitable size. To find the optimal approximate solution in the set SE to a given matrix, we give a new feasible method based on the projection theorem, the generalized SVD and the canonical correction decomposition.

关键词： Least-squares solution Optimal approximate solution Generalized singular value decomposition Canonical correlation decomposition.

Dark Matter Particle Explorer observations of high-energy cosmic ray electrons plus positrons and their physical implications

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2018年第10期61卷 2-13页

作者： Qiang yuan lei Feng Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210008China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Center for High Energy Physics Peking UniversityBeijing 100871China

The DArk Matter Particle Explorer （DAMPE） is a satellite-borne, high-energy particle and 3,-ray detector, which is dedicated to indirectly detecting particle dark matter and studying high-energy astrophysics. The first results about precise measurement of the cosmic ray electron plus positron spectrum between 25 GeV and 4.6 TeV were published recently. The DAMPE spectrum reveals an interesting spectral softening arount 0.9 TeV and a tentative peak around 1.4 TeV. These results have inspired extensive discussion. The detector of DAMPE, the data analysis, and the first results are introduced. In particular, the physical interpretations of the DAMPE data are reviewed.

关键词： dark matter cosmic rays electrons plus positrons pulsars

Measuring the magnetic topological spin structure of light using an anapole probe

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第10期11卷 2503-2511页

作者： Fanfei Meng Aiping Yang kang Du Fengyang Jia Xinrui lei Ting Mei Luping Du Xiaocong yuan Nanophotonics Research Centre Institute of Microscale OptoelectronicsShenzhen University518060 ShenzhenChina MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi'anChina

Topological spin structures of light,including the Skyrmion,Meron,and bi-Meron,are intriguing optical phenomena that arise from spin-orbit *** have promising potential applications in nano-metrology,data storage,super-resolved imaging and chiral *** from the electric part of optical spin,of equal importance is the magnetic part,particularly the H-type electromagnetic modes for which the spin topological properties of the field are dominated by the magnetic ***,their observation and measurement remains absent and faces difficult ***,we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic *** probe is composed of an Ag-core and Si-shell nanosphere,which manifests as a pure magnetic dipole with no electric *** effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector *** was subsequently employed to measure the magnetic topological spin structures,including individual Skyrmions and Meron/Skyrmion lattices for the first *** proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics.

关键词： field. topological dipole

Evolution of molecular structure of TATB under shock loading from transient Raman spectroscopic technique

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

Defence Technology（防务技术） 2024年第3期33卷 613-620页

作者： Hongliang kang Xue Yang Wenshuo yuan lei Yang Xinghan Li Fusheng Liu Zhengtang Liu Qijun Liu Bond and Band Engineering Group School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

By combination of the transient Raman spectroscopic measurement and the density functional theoretical calculations,the structural evolution and stability of TATB under shock compression was *** to the improvement in synchronization control between two-stage light gas gun and the transient Raman spectra acquisition,as well as the sample preparation,the Raman peak of the N-O mode of TATB was firstly observed under shock pressure up to 13.6 GPa,noticeably higher than the upper limit of 8.5 GPa reported in available *** taking into account of the continuous shift of the main peak and other observed Raman peaks,we did not distinguish any structural transition or any new ***,both the present Raman spectra and the time-resolved radiation of TATB during shock loading showed that TATB exhibits higher chemical stability than previous *** reveal the detailed structural response and evolution of TATB under compression,the density functional theoretical calculations were conducted,and it was found that the pressure make N-O bond lengths shorter,nitro bond angles larger,and intermolecular and intra-molecular hydrogen bond interactions *** observed red shift of Raman peak was ascribed to the abnormal enhancement of H-bound effect on the scissor vibration mode of the nitro group.

关键词： TATB Raman spectra Structural evolution Shock loading

Endogenous/exogenous dual stimulation“ROS engineering”amplification combined with autophagy-augmented for efficient ferroptosis therapy

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 597-606页

作者： Pengye Du Pengpeng lei yuan Liang Ran An Yi Wei Shuyu Liu Jianhao Zheng Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Department of Chemistry Tsinghua UniversityBeijing 100084China

“Reactive oxygen species(ROS)engineering”is one of the most promising anti-tumor treatments developed in recent *** explosion of ROS will cause oxidative stress,thereby inducing tumor cell ***,ROS accumulation in tumor cells is eliminated by endogenous cellular self-regulation *** this work,a kind of endogenous/exogenous dual stimulation nanoagent noted as UMZC is *** reaction occurs between NH_(2)-MIL-88B(Fe)contained in UMZC and the overexpression of endogenous H_(2)O_(2)to generate ROS,amplified by endogenous H_(2)S of colon tumor *** addition,NH_(2)-MIL-88B(Fe)also functions to deplete glutathione(GSH)for stopping it from consuming *** nanoparticles at the core of UMZC convert near-infrared into visible light,which excites zinc phthalocyanine to initiate the photochemical reaction that generates more ROS,thus alleviating the lack of tissue penetration depth for visible *** agonist chitosan oligosaccharides induce enhancement of cellular autophagy for disrupting cellular metabolic stress and the resistance to oxidative stress of tumor cells,allowing“ROS engineering”to fully exert anti-tumor *** of ROS generation,GSH depletion,and induced cellular autophagy caused by nanoagents have promoting effects on the occurrence of ***,the nanoagents show the ability to effectively treat colon tumors.

关键词： reactive oxygen species(ROS)engineering upconversion nanoparticles cellular autophagy ferroptosis tumor therapy

The Anion Binding Affinity Determines the Strength of Anion Specificities of Thermosensitive Polymers

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 Journal of Polymer Science 2021年第11期39卷 1351-1356页

作者： lei-lei Lian Si-yuan Xu Hai-Yang yuan Guang-Ming Liu Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China

In this work,we demonstrate that the strength of anion specificities of thermosensitive polymers is determined by the affinity of direct anion binding to the *** have prepared a series of thermosensitive statistical copolymers with distinct thermoresponsive *** anions can specifically interact with the different types of thermosensitive polymers in very different strengths.A similar strength of specific anion effects on thermoresponsive behaviors can be observed at very different salt concentrations for the different types of thermosensitive polymers.A stronger anion binding to the thermosensitive polymers gives rise to a more obvious anion specificity and vice *** work presented here opens up opportunities for the application of ion binding affinity to modulate the strength of ion specificities of thermosensitive polymers.

关键词： Specific ion effect Polyzwitterion Ion-polymer interaction Thermosensitivity Ion-pairing

Self-adaptive bulk/surface engineering of Bi_(x)O_(y)Br_(z) towards enhanced photocatalysis:Current status and future challenges

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第7期82卷 387-413,I0009页

作者： Zhiwei Wu Bidyut Kumar Kundu Wanqiong kang lei Mao Sen Zhang Lan yuan Fen Guo Chuang Han Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081HubeiChina Department of Chemistry University of CincinnatiCincinnatiOH 45221United States The PLA Rocket Force Command College Wuhan 430012HubeiChina Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

The bulk/surface states of semiconductor photocatalysts are imperative parameters to maneuver their performance by significantly affecting the key processes of photocatalysis including light absorption,separation of charge carrier,and surface site *** years have witnessed the encouraging progress of self-adaptive bulk/surface engineered Bi_(x)O_(y)Br_(z) for photocatalytic applications spanning various ***,despite the maturity of current research,the interaction between the bulk/surface state and the performance of Bi_(x)O_(y)Br_(z) has not yet been fully understood and *** this regard,a timely tutorial overview is quite urgent to summarize the most recent key progress and outline developing obstacles in this exciting ***,the structural characteristics and fundamental principles of Bi_(x)O_(y)Br_(z)for driving photocatalytic reaction as well as related key issues are firstly ***,we for the first time summarized different self-adaptive engineering processes over Bi_(x)O_(y)Br_(z)followed by a classification of the generation approaches towards diverse Bi_(x)O_(y)Br_(z)*** features of different strategies,the up-to-date characterization techniques to detect bulk/surface states,and the effect of bulk/surface states on improving the photoactivity of Bi_(x)O_(y)Br_(z)in expanded applications are further ***,the present research status,challenges,and future research opportunities of self-adaptive bulk/surface engineered Bi_(x)O_(y)Br_(z)are *** is anticipated that this critical review can trigger deeper investigations and attract upcoming innovative ideas on the rational design of Bi_(x)O_(y)Br_(z)-based photocatalysts.

关键词： Bismuth oxybromide Self-adaptive engineering Pollutant degradation Energy application Photocatalysis

Changing provenance of late Cenozoic sediments in the Jianghan Basin

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2015年第4期6卷 605-615页

作者： lei Shao Shengyuan yuan Chang'an Li Chunguo kang Wenjing Zhu Yindi Liu Jietao Wang Wuhan Center of Geological Survey China Geological Survey Faculty of Earth Sciences China University of Geosciences College of Urban Planning & Environment Science Xuchang University State Key Laboratory of Biogeology and Environmental Geology Institute of Geophysics & Geomatics China University of Geosciences Hubei Institute of Geological Sciences

The Yangtze River is one of the most important components of the East Asia river system. In this study, sediments in the Jianghan Basin, middle Yangtze River, were selected for trace element and rare earth element （REE） measurements, in order to decipher information on the change of sediment provenance and evolution of the Yangtze River. According to the elemental variations, the late Cenozoic sediments of the Jianghan Basin could be divided into four parts. During 2.68-2,28 Ma and 1.25-0 Ma, proveJ nance of the sediments was consistent, whereas sediments were derived from variable sources during 2.28-1.25 Ma. Comparison of the elemental compositions between the Pliocene and Quaternary sediments revealed a change in sediment source from a more felsic source area to a more basic source area around the Pliocene--Quaternary boundary. Input from the Emeishan LIP should account for this provenance change, Based on the provenance analysis of sediments in the Jianghan Basin, we infer that the Yangtze River developed into a large river with its drainage basin extended to the Emeishan LIP no later than the Pliocene-Quaternary boundary.

关键词： Yangtze River Jianghan Basin Trace element REE Provenance