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Chirping instabilities produced by a runaway electron beam at a spherical tokamak

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plasma Science and Technology 2023年第7期25卷 19-24页

作者： I M BALACHenKOV n n BAKHAReV V K GUSeV M V ILIASOVA e M KHILKeVICH p S KOReneV A e KOnKOV V B MInAeV Yu V MITRIZHKIn M I pATROV Yu V peTROV n V SAKHAROV A e SHeVeLeV O M SKReKeL Ioffe Institute Saint-Petersburg 194021Russia Lomonosov Moscow State University Moscow 119991Russia

Two different types of MHD instabilities with rapidly chirping frequency were found to arise in the Globus-M2 spherical tokamak in substantially different frequency *** first type arises at frequencies of an order of 1 MHz in ohmic plasmas at relatively low density(n_(e))n a wide range of toroidal magnetic fields and plasma *** type of instability was identified as compressional Alfven waves,driven by electrons,accelerated during a sawtooth *** was found that the mode frequency is sweeping in time,according to the Berk-Breizman hole-clump nonlinear chirping *** second type of wave arises in a specific single-swing regime of the central solenoid current with a very narrow plasma column,when the plasma tends to decay at extremely low density(n_(e))nd,in fact,is an instability of the runaway electron *** exited modes cover the whole observed frequency range and are divided into several(two or three)frequency regions:approximately 0-30 MHz,60-120 MHz and sometimes 30-60 *** of the branches was also *** chirps are more rapid than for 1 MHz Alfven instability and follow an exponential *** paper,to our knowledge,is the first report of frequency chirping instabilities excited by accelerated electrons at a spherical tokamak.

关键词： Alfvén waves chirping instability spherical tokamak runaway electrons

Quaternary Ammonium-based Composite particles for Antibacterial Finishing of Cotton-based Textiles

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Journal of Materials Science & Technology 2014年第1期30卷 19-29页

作者： M.Messaoud e.Chadeau p.Chaudouёt n.Oulahal M.Langlet LMGp(Grenoble Institute of Technology-Minatec) LRGIA(Universit de Lyon Universit Lyon 1)

The antibacterial finishing of cotton-based fabrics has been achieved from quaternary ammonium-based composite particles. This functionalization is based on the simple dilution of a quaternary ammonium cation （QAC） hybrid alkoxide within a sol-gel derived crystalline suspension （CS） of TiO2 in liquid solution. This protocol yields the preparation of QAC-Ti02 （QT） composite sols by using a same CS over a long period of time, and enables an easy regeneration of derived QT sols after quite long aging periods. Composite sols can then be impregnated on various kinds of substrates, including textile fabrics. Fourier transform infrared spectroscopy studies, as well as optical and scanning electron microscopy observations, have been used to investigate chemical and morphological features arising from QT particles. Antibacterial tests have then been performed on so-finished textiles and are discussed in relation to chemical and morphological features. It is shown that this sol-gel route flexibly yields a similarly strong antibacterial activity on cotton-based fabrics against both Gram-negative and Gram-positive bacteria, Le. tested fabrics exhibit an antibacterial activity （a（~cording to the ISO 20743-2005 standard） ranging between 7.5 and 7.9 against both kinds of bacteria tested here. Finishing treatments also allow preserving the hand feeling and visual aspect of the textiles and promote a rather good attachment of impregnated particles on the surface of textile fibers.

关键词： Quaternary ammonium TiO2 Antibacterial efficiency Textile Sol-gel

Crystallization Behaviour and nanostructuring in Alkali niobiosilicate Glasses

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Journal of Materials Science & Technology 2011年第2期27卷 189-192页

作者： e.Fanelli p.pernice M.Xiao A.Aronne V.n.Sigaev Dipartimento di Ingegneria dei Materiali e della produzione Universit'a di Napoli Federico IINapoli 80125Italy Department of Materials Science and engineering Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Renewable energy and Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Mendeleev University of Chemical Technology Glass and Glass-CeramicsMiusskaya sq.9125190 MoscowRussia

23K2O·27nb2O5·50SiO 2（KnS）,13K2O·10na2O·27nb2O5·50SiO 2（KnanS） and 15K2O·12Li2O·27nb2O5·46SiO2（KLinS） transparent glasses were synthesized by melt-quenching technique,and studied by differential thermal analysis（DTA）,X-ray diffraction（XRD） and high-resolution transmission electron microscopy（HRTeM） to reveal the effect of the devitrification behaviour on transparent *** above the glass transition temperature T g in the KnS glass,an unidentified phase was formed,while in KnanS and KLinS,mixed-alkali niobate phases with tungsten bronze structure were obtained by bulk *** treatments at T g performed on the KnS glass resulted in the transparent nanostructure with second order harmonic generation（SHG） *** treatment for 10 h on KnanS and KLinS decreased the first DTA exothermic peaks（at least 24C）,indicating the bulk nucleation,which was confirmed by the DTA in comparison with the powdered as-quenched *** and KLinS showed similar XRD profiles as the K3Li2nb5O15 crystal with the five most intense peaks at 22.7,29.4,32.3,46.3 and 52.0 *** micrograph showed clear-cut nano-sized circular domains and spherical nanocrystals dispersed into the amorphous matrix.

关键词： niobiosilicate glasses Crystallization nanostructuring

3D printing of patient-specific 316L–stainless–steel medical implants using fused filament fabrication technology: two veterinary case studies

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Bio-Design and Manufacturing 2022年第4期5卷 808-815页

作者： J.M.Chacón p.J.núñez M.A.Caminero e.García-plaza J.Vallejo M.Blanco escuela Técnica Superior de Ingeniería Industrial Universidad de Castilla-La ManchaAvdaCamilo JoséCela213071 Ciudad RealSpain protresde Ingeniería y Soluciones C/Solana 60nave 313005 Ciudad RealSpain

Biomedical fracture fixation implants have complex sculptured geometries to adapt perfectly to fractured bones,making them difficult and expensive to manufacture with conventional machining methods. Fused filament fabrication(FFF) is a very popular Additive Manufacturing technology that simplifies the manufacture of parts with complex geometries, making it ideal for the manufacture of customized medical implants.

关键词： steel fracture fused

enhancing perianal disease management with integrated physical and psychological approaches

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World Journal of Clinical Cases 2025年第2期13卷 59-63页

作者： Uchenna e Okpete Haewon Byeon Department of Digital Anti-aging Healthcare(BK21) Inje UniversityGimhae 50834South Korea

This article provides a comprehensive analysis of the study by Hou et al,focusing on the complex interplay between psychological and physical factors in the postoperative recovery(pOR)of patients with perianal *** study sheds light on how illness perception,anxiety,and depression significantly influence recovery *** et al developed a predictive model that demonstrated high accuracy in identifying patients at risk of poor *** article explores the critical role of pre-operative psychological assessment,highlighting the need for mental health support and personalized recovery plans in enhancing pOR quality.A multidisciplinary approach,integrating mental health professionals with surgeons,anesthesiologists,and other specialists,is emphasized to ensure comprehensive care for *** study’s findings serve as a call to integrate psychological care into surgical practice to optimize outcomes for patients with perianal diseases.

关键词： perianal disease post-operative recovery Anxiety Depression pain management emotional well-being Multidisciplinary approach

people’s perception and socioeconomic determinants of soil erosion:A case study of Samanalawewa watershed, Sri Lanka

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International Journal of Sediment Research 2010年第4期25卷 323-339页

作者： e.p.n. UDAYAKUMARA R.p.SHReSTHA L.SAMARAKOOn D.SCHMIDT-VOGT natural Resource Management Field of Study School of Environment Resources and Development Asian Institute of Technology natural Resources Management Field of Study School of Environment Resources and Development Asian Institute of Technology Geoinformatics Centre Asian Institute of Technology Centre of Mountain ecosystem Studies Kunming Institute of Botany Chinese Academy of Sciences 3/F Library Building Heilongtan

Though soil erosion is an important concern in Sri Lanka, there is a dearth of baseline information on soil erosion in many ofits watersheds, which obstructs monitoring of soil erosion and mitigating its effects. In order to assess soil erosion in a critical watershed and to identify its determinants, the Samanalawewa watershed, which contains one of the main hydropower generating reservoirs in Sri Lanka, was selected for this study. Remote-sensing (RS) and geographic information system (GIS) based modeling as well as field experiments were employed to assess and map soil erosion rates. Results indicated that the current rate of soil erosion ranges from 0 to 289 t/ha/yr, and that the average rate of soil erosion has been declining from 20 to 4 t/ha/yr over a period from 1986 to 2008. The current rate of soil erosion is, however, still about 14 to 33 times greater than the natural soil generation rate. Socioeconomic factors and peoples’ perception of soil erosion and soil conservation measures were examined using data collected through a household survey. Multiple regression analysis with eighteen covariates of socioeconomic characteristics yielded eleven socioeconomic variables, viz. household size, farm labor, education, land tenure, conservation cost, training, committee membership, professional competencies, income, distance, and financial capital as the predictor variables of soil erosion. Farmers identified improper soil and crop management practices as the major causes of erosion. The adoption of conservation measures, their effectiveness, and their impact on ecosystem services were also examined.

关键词： Soil erosion people perception Determinants of soil erosion Conservation measures Sri Lanka

Micro-sonic sensor technology enables enhanced grass height measurement by a Rising plate Meter

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Information processing in Agriculture 2019年第2期6卷 279-284页

作者： D.McSweeney n.e.Coughlan R.n.Cuthbert p.Halton S.Ivanov Teagasc Animal&Grassland Research and Innovation CentreMooreparkFermoyCo.CorkIreland Telecommunications Software&Systems Group Waterford Institute of TechnologyWaterfordIreland Institute for Global Food Security School of Biological SciencesQueen’s University BelfastMedical Biology Centre97 Lisburn RoadBelfast BT97BLNorthern IrelandUnited Kingdom True north Technologies Unit 14Shannon Business CentreShannonCounty ClareIreland

Globally,the Rising plate Meter(RpM)is a device used to measure compressed sward height,to enable estimation of herbage *** improved farm management practices aided by a variety of technological advances,the standard design of a RpM has remained relatively ***,however,a RpM utilising a micro-sonic sensor,with digital data capture capability via a Bluetooth communications link to a smart device application,has been ***,we assess the comparable ability of both a standard cumulative ratchet counter RpM and the micro-sonic sensor RpM,to accurately and precisely measure fixed ***,as correct allocation of grazing area requires accurate geolocation positioning,we assess the associated GpS *** micro-sonic sensor RpM was significantly more accurate for height capture than the cumulative ratchet counter ***,across all heights,the cumulative ratchet counter RpM underestimated height by 7.68±0.06mm(mean±Se).Alternatively,the micro-sonic sensor RpM overestimated height by 0.18±0.08 *** relation to a practical applications,these discrepancies can result in an under-and overestimation of dry matter yield by 13.71%and 0.32%kilograms per hectare,*** performance of the on-board GpS did not significantly differ from that of a tertiary ***,the wireless technology,integrated mapping,and decision support tools offered by the innovative micro-sonic sensor RpM provides for a highly efficacious grassland management tool.

关键词： Decision support systems dry matter yield Grassland Rising plate meter precision agriculture Wireless sensor network

Approximate solutions of Klein-Gordon equation with improved Manning-Rosen potential in D-dimensions using SUSYQM

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Chinese physics B 2014年第12期23卷 38-43页

作者： A.n.Ikot H.Hassanabadi H.p.Obong Y.e.Chad Umoren C.n.Isonguyo B.H.Yazarloo Department of physics University of Port HarcourtChoba P M B5323 Port Harcourt Nigeria Department of Basic Sciences Shahrood Branch Islamic Azad UniversityShahrood Iran Theoretical physics Group Department of Physics University of Uyo-NigeriaNigeria

In this paper, we present solutions of the Klein–Gordon equation for the improved Manning–Rosen potential for arbitrary l state in d-dimensions using the supersymmetric shape invariance method. We obtained the energy levels and the corresponding wave functions expressed in terms of Jacobi polynomial in a closed form for arbitrary l state. We also calculate the oscillator strength for the potential.

关键词： Klein–Gordon equation improved Manning–Rosen potential supersymmetric quantum mechanics(SUSYQM)

An efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron nitride nanotubes

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nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai Zhang Liping Ding Liyun Wu Songfeng e Qian He nanyang Wang Hui Zuo Zhengyang Zhou Feng Ding Yue Hu Jin Zhang Yagang Yao national Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BnnTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BnnTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with n atoms to form Bn *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BnnTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation Density functional theory