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Ultrasmall CoS nanoparticles embedded in heteroatom-doped carbon for sodium-ion batteries and mechanism explorations via synchrotron X-ray techniques

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Journal of Energy Chemistry 2023年第4期79卷 373-381页

作者： Congcong Liu Qiongqiong Lu Mikhail v.Gorbunov Ahmad Omar Ignacio G.Gonzalez Martinez Panpan Zhao Martin Hantusch Antonius Dimas Chandra Permana Huanyu He Nikolai Gaponik Daria Mikhailova Leibniz Institute for Solid State and Materials Research(IFW)Dresden e.v. Helmholtzstraße 2001069 DresdenGermany Inorganic Chemistry II Technische Universität DresdenBergstraße 6601069 DresdenGermany Physical Chemistry Technische Universität DresdenZellescher Weg 1901069 DresdenGermany

Transition metal sulfides have been regarded as promising anode materials for sodium-ion batteries(SIB).However,they face the challenges of poor electronic conductivity and large volume change,which result in capacity fade and low rate *** this work,a composite containing ultrasmall CoS(~7 nm)nanoparticles embedded in heteroatom(N,S,and O)-doped carbon was synthesized by an efficient one-step sulfidation process using a Co(Salen)*** ultrasmall CoS nanoparticles are beneficial for mechanical stability and shortening Na-ions diffusion ***,the N,S,and O-doped defect-rich carbon provides a robust and highly conductive framework enriched with active sites for sodium storage as well as mitigates volume expansion and polysulfide *** anode for SIB,CoS@HDC exhibits a high initial capacity of 906 mA h g^(-1)at 100 mA g^(-1)and a stable long-term cycling life with over 1000 cycles at 500 mA g^(-1),showing a reversible capacity of 330 mA h g^(-1).Meanwhile,the CoS@HDC anode is proven to maintain its structural integrity and compositional reversibility during ***,Na-ion full batteries based on the CoS@HDC anode and Na_(3)v_(2)(PO_(4))_(3)cathode demonstrate a stable cycling behavior with a reversible specific capacity of~200 m A h g^(-1)at least for 100 ***,advanced synchrotron operando X-ray diffraction,ex-situ X-ray absorption spectroscopy,and comprehensive electrochemical tests reveal the structural transformation and the Co coordination chemistry evolution of the CoS@HDC during cycling,providing fundamental insights into the sodium storage mechanism.

关键词： Sodium-ion batteries Cobalt sulfide nanoparticles Heteroatom-doped porous carbon matrix Synchrotron X-ray techniques Reaction mechanisms

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How and Why Do Gestational Trophoblastic Neoplasms Overproduce Human Chorionic Gonadotropin?

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Open Journal of Obstetrics and Gynecology 2015年第1期5卷 1-5页

作者： C. v. Rao Departments of Cellular Biology and Pharmacology Molecular and Human Genetics and Obstetrics and Gynecology Reproduction and Development Program Herbert Wertheim College of Medicine Florida International University Miami USA

From the published data, the present mini-review attempts to answer two fundamental questions about the gestational trophoblastic neoplasms. In addition, it extrapolates the findings to other cancers that produce smal... 详细信息

关键词： Human Chorionic Gonadotropin hCG Receptors Gestational Trophoblastic Neoplasms hCG Biosynthesis Choriocarcinoma Cells

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Instantaneous foveated preview for progressive Monte Carlo rendering

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Computational visual Media 2018年第3期4卷 267-276页

作者： Matias K. Koskela Kalle v. Immonen Timo T. viitanen Pekka O. Jaaskelainen Joonas I. Multanen Jarmo H. Takala Tampere University of Technology Tampere 33720Finland.

Progressive rendering, for example Monte Carlo rendering of 360° content for virtual reality headsets, is a time-consuming task. If the 3D artist notices an error while previewing the rendering, they must return to editing mode, make the required changes, and restart rendering. We propose the use of eye-tracking-based optimization to significantly speed up previewing of the artist＇s points of interest. The speed of the preview is further improved by sampling with a distribution that closely follows the experimentally measured visual acuity of the human eye, unlike the piecewise linear models used in previous work. In a comprehensive user study, the perceived eonvergence of our proposed method was 10 times faster than that of a conventional preview, and often appeared to be instantaneous. In addition, the participants rated the method to have only marginally more artifacts in areas where it had to start rendering from scratch, compared to conventional rendering methods that had already generated image content in those areas.

关键词： foveated rendering progressive renderingMonte Carlo rendering preview 360°content

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TYMS gene 5'-and 3'-untranslated region polymorphisms and risk of non-syndromic cleft lip and palate in an Indian population

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The Journal of Biomedical Research 2015年第4期29卷 337-339页

作者： Jyotsna Murthy venkatesh Babu G. L.v.K.S.Bhaskar Department of Biomedical Sciences Sri Ramachandra University Department of Plastic Surgery Sri Ramachandra University

Dear Editor： Increased homocysteine levels due to vitamin B6 or B12 deficiency or genetic defects in folate pathway genes are associated with an increased incidence of non-syndromic cleft lip with or without cleft palate （NSCLP）tlj. Thymidylate synthase （TS） is a folate-dependent enzyme that catalyzes methylation of 2＇-deoxyuridine-5＇-monophosphate （dUMP） to 2＇-deox- ythymidine-5＇-monophosphate （dTMP）, a rate-limiting step in DNA synthesis,

关键词： TYMS gene 5 untranslated region polymorphisms and risk of non-syndromic cleft lip and palate in an Indian population and 3 gene

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Operating Characteristics of Cathodes Used for Microwave vacuum-Electronic Devices

Operating Characteristics of Cathodes Used for Microwave Vac...

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The 5th International vacuum Electron Sources Conference(IvESC2004)

作者： v.G.vorozheikin v.I. Kozlov RPC "Electron Systems" of FSUE RPE "ALMAZ" 1Panfilova str.Saratov410033Russia

＜正＞Ensuring the emissive reliability of microwave vacuum-electronic devices （MvED） is closely related to knowledge of the main operating characteristics of cathodes, primarily of cathode emissive ability and potential （resource） life. In research practice it is convenient to perform an estimate of cathode emissive ability via pre-heated curve [1] from which the knee temperature Tkn is found.

关键词： Cathodes Microwave devices Current density Knee Electrons vacuum systems Temperature dependence Production Nickel Additives

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Exercise following resolution of post-concussive symptoms

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中华物理医学与康复杂志 2018年第10期40卷 753-753页

作者： Anderson v Manikas v Babl FE

BACKGROUND AND OBJECTIvE For children and adolescents,guidelines for return to play following concussion recommend a gradual increase in activity, with monitoring for post-concussive symptoms. The authors examined the effect of exercise on PCS and cognition in children and adolescents following the resolution of symptoms *** This study included 41 males and 39 females, ranging in age from eight to 18 years, each of whom had been diagnosed with a concussion at an emergency room visit,(CON group). Healthy controls,(HC group), were also recruited, comprising non-injured adoles-

关键词：分辨率症状青少年毕业生 PCS 震动

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Causal analysis of competing atomistic mechanisms in ferroelectric materials from high-resolution scanning transmission electron microscopy data

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npj Computational Materials 2020年第1期6卷 570-578页

作者： Maxim Ziatdinov Christopher T.Nelson Xiaohang Zhang Rama K.vasudevan Eugene Eliseev Anna N.Morozovska Ichiro Takeuchi Sergei v.Kalinin The Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA Computational Sciences and Engineering Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Materials Science and Engineering University of MarylandCollege ParkMD 20742USA Institute for Problems of Materials Science National Academy of Sciences of UkraineKrjijanovskogo 3Kyiv 03142Ukraine Institute of Physics National Academy of Sciences of Ukraine46pr.NaukyKyiv 03028Ukraine

Machine learning has emerged as a powerful tool for the analysis of mesoscopic and atomically resolved images and spectroscopy in electron and scanning probe microscopy,with the applications ranging from feature extraction to information compression and elucidation of relevant order parameters to inversion of imaging data to reconstruct structural ***,the fundamental limitation of machine learning methods is their correlative nature,leading to extreme susceptibility to confounding ***,we implement the workflow for causal analysis of structural scanning transmission electron microscopy(STEM)data and explore the interplay between physical and chemical effects in a ferroelectric perovskite across the ferroelectric–antiferroelectric phase transitions.

关键词： ferroelectric analysis founding

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FLOW FIELD IN SCOURED ZONE OF CHANNEL CONTRACTIONS

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International Journal of Sediment Research 2004年第4期19卷 292-311页

作者： Rajkumar v. RAIKAR,Subhasish DEY Kharagpur 721302 West Bengal India. Doctoral Research Fellow Department of Civil Engineering Indian Institute of Technology Kharagpur 721302 West Bengal India. Associate Professor Department of Civil Engineering Indian Institute of Technology

Experiments were conducted in a laboratory flume to measure the two-dimensional turbulent flow field in the scoured zone of channel contractions under a clear-water scour condition. The Acoustic Doppler velocimeter (ADv) was used to detect the flow field at different vertical lines along the centerline of uncontracted (main channel) and contracted zones of the channel. The distributions of time-averaged velocity components, turbulent intensity, turbulent kinetic energy, and Reynolds stresses are presented in nondimensional graphical form. The bed shear stresses are computed from the measured Reynolds stresses being in threshold condition within the zone of contraction where bed was scoured. The data presented in this paper would be useful to the investigators for the development of kinematic flow model and morphological model of scour at a channel or river contraction.

关键词： Channel contraction Open channel flow Turbulent flow Erosion Scour Sediment transport Fluvial hydraulics

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The Energy Conservation Paradox of Quantum Physics

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Journal of Modern Physics 2015年第11期6卷 1586-1590页

作者： v. E. Shapiro Shapiro Physics Vancouver Canada

This work asserts that quantum theory runs into a fundamental conflict with the principles of energy conservation inferred from the statistical evolution of interacting systems. The gist is the energy of systems by the principles of Lagrangian mechanics leaves out of account their energy associated with the phase flows of non-invariant phase volume. The quantum theory takes this fact into account, but does that improperly. We show it by presenting insoluble inconsistencies and a case study.

关键词： Quantum Energy Transfer Phase volume Invariance Detailed Balance vortex Energy

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Mossbauer Study of Mechanica Aloying Fe-Ti and Fe-Ti-N Alloys

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Journal of Materials Science & Technology 2001年第1期17卷 1-2页

作者： T.A.Popovich O.v.Arestov A.A.Popovich A.S.Kuchma Far Eastern State Technical University 10 Pushkin St.

Mossbauer spectrometry was used to study the peculiarity of formation of nonequilibrium phase in Fe-Ti and Fe-Ti-N systems by mechanical alloying. Mossbauer spectra of powders show the formation of nonequilibrium crystalline phase and intermetallic compounds during a mechanical alloying process depending on the alloy composition and the milling time.

关键词： Ti Fe ssbauer Study of Mechanical Alloying Fe-Ti and Fe-Ti-N Alloys

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