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Strike Point Control on EAST Using an Isoflux Control method

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Plasma Science and Technology 2015年第9期17卷 774-780页

作者：邢哲肖炳甲罗正平 m.l.walker D.A.HUmPHREYS Institute of Plasma Physics Chinese Academy of Sciences School of Nuclear Science and Technology University of Science and Technology of China General Atomics General Atomics Ct.San DiegoCA 92186USA

For the advanced tokamak,the particle deposition and thermal load on the divertor is a big *** moving the strike points on divertor target plates,the position of particle deposition and thermal load can be *** could adjust the Poloidal Field（PF） coil current to achieve the strike point position feedback *** isoflux control method,the strike point position can be controlled by controlling the X point *** the basis of experimental data,we establish relational expressions between X point position and strike point *** experiments are carried out to validate the correctness and robustness of the control *** strike point position is successfully controlled following our command in the EAST operation.

关键词： EAST plasma control system strike point control

The stability margin on EAST tokamak

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Chinese Physics B 2009年第6期18卷 2432-2440页

作者：钱金平万宝年沈彪 m.l.walker D.A.Humphreys 肖炳甲 Institute of Plasma Physics Chinese Academy of Sciences General Atomics San DiegoCaliforniaUSA

The experimental advanced superconducting tokamak （EAST） is the first full superconducting tokamak with a D-shaped cross-sectional plasma presently in operation. Its poloidal coils are relatively far from the plasma due to the necessary thermal isolation from the superconducting magnets, which leads to relatively weaker coupling between plasma and poloidal field. This may cause more difficulties in controlling the vertical instability by using the poloidal coils. The measured growth rates of vertical stability are compared with theoretical calculations, based on a rigid plasma model. Poloidal beta and internal inductance are varied to investigate their effects on the stability margin by changing the values of parameters αn and γn（Howl et al 1992 Phys. Fluids B 4 1724）, with plasma shape fixed to be a configuration with k = 1.9 and 5 = 0.5. A number of ways of studying the stability margin are investigated. Among them, changing the values of parameters κ and li is shown to be the most effective way to increase the stability margin. Finally, a guideline of stability margin ms（ki, li, A） to a new discharge scenario showing whether plasmas can be stabilized is also presented in this paper.

关键词： vertical instability growth rate stability margin

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在恶劣环境下管柱的特殊防护

石油勘探开发情报 1991年第3期 57-60页

作者： m.l.walker 袁建强

由于高合金钢管柱的抗腐蚀性及较低的维护费用和较长的使用寿命等优点，使得高合金管柱在油田得到了广泛使用，但尽管高合金管柱能抵抗硫化氢，二氧化碳和盐水等化合物的腐蚀，但对盐酸、氢氟酸等强酸的存在十分敏感，随着油田作为主要... 详细信息

由于高合金钢管柱的抗腐蚀性及较低的维护费用和较长的使用寿命等优点，使得高合金管柱在油田得到了广泛使用，但尽管高合金管柱能抵抗硫化氢，二氧化碳和盐水等化合物的腐蚀，但对盐酸、氢氟酸等强酸的存在十分敏感，随着油田作为主要增产措施之一酸化压的广为使用，油气井管柱的腐蚀破坏情况也日益严重，因此，有必要研制防止酸化液腐蚀油井管柱的缓蚀剂系列，文中介绍了油气井高合金管柱腐蚀的最新资料，试验证明了低合金缓蚀剂不适用于高合金管柱，研究得出了适应于保护高合金管柱的缓蚀剂体系及具有最大岩石溶解能力和最低腐蚀能力酸化液体系。

关键词：油气井高合金管柱防腐缓蚀剂体系酸化液体系

Background removal from global auroral images:Data-driven dayglow modeling

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Earth and Planetary Physics 2024年第1期8卷 247-257页

作者： A.Ohma m.madelaire K.m.laundal J.P.Reistad S.m.Hatch S.Gasparini S.J.walker Birkeland Centre for Space Science Department of Physics and TechnologyUniversity of BergenBergenNorway

Global images of auroras obtained by cameras on spacecraft are a key tool for studying the near-Earth ***,the cameras are sensitive not only to auroral emissions produced by precipitating particles,but also to dayglow emissions produced by photoelectrons induced by *** emissions and scattered sunlight can contribute to the background *** fully utilize such images in space science,background contamination must be removed to isolate the auroral *** we outline a data-driven approach to modeling the background intensity in multiple images by formulating linear inverse problems based on B-splines and spherical *** approach is robust,flexible,and iteratively deselects outliers,such as auroral *** final model is smooth across the terminator and accounts for slow temporal variations and large-scale asymmetries in the *** demonstrate the model by using the three far ultraviolet cameras on the Imager for magnetopause-to-Aurora Global Exploration(ImAGE)*** method can be applied to historical missions and is relevant for upcoming missions,such as the Solar wind magnetosphere Ionosphere link Explorer(SmIlE)mission.

关键词： aurora dayglow modeling global auroral images far ultraviolet images dayglow removal

On calculating glacial isostatic adjustment

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Geodesy and Geodynamics 2024年第5期15卷 441-452页

作者： l.m.Cathles Cornell University IthacaNY 14853USA

modeling the earth's fluid and elastic response to the melting of the glaciers of the last ice age is the most direct way to infer the earth's radial viscosity ***,we compare two methods for calculating the viscoelastic response to surface *** one,the elastic equation of motion is converted to a viscoelastic equation using the Correspondence *** the other,elastic deformation is added to the viscous flow as isostatic adjustment *** two modeling methods predict adjustment histories that are different enough to potentially impact the interpretation of the observed glacial isostatic adjustment(GIA).The differences arise from buoyancy and whether fluid displacements are subjected to hydrostatic *** methods agree if they use the same equations and boundary *** origin of the differences is determined by varying the boundary conditions and pre-stress application.

关键词： Glacial isostatic adjustment Viscoelastic normal modes Hydrostatic pre-stress Elastic buoyancy Correspondence principle

Thermoregulation,incubator humidity,and skincare practices in appropriate for gestational age ultra-low birth weight infants:need for more evidence

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World Journal of Pediatrics 2024年第7期20卷 643-652页

作者： Umesh mishra Deanne August Karen walker Pranav R.Jani mark Tracy Faculty of medicine and Health University of SydneySydneyAustralia Department of Neonatology Westmead HospitalWestmeadNSWAustralia Grantley Stable Neonatal Unit Royal Brisbane and Women’s HospitalBrisbaneAustralia School of Nursing Midwifery and Social WorkUniversity of QueenslandBrisbaneAustralia Department of Newborn Care Royal Prince Alfred HospitalCamperdownAustralia

Background Although not universal,active care is being offered to infants weighing<500 g at birth,referred to as ultra-low birth weight(UlBW)infants appropriate for gestational *** infants have the greatest risk of dy... 详细信息

Background Although not universal,active care is being offered to infants weighingltra-low birth weight(UlBW)infants appropriate for gestational *** infants have the greatest risk of dying or developing major *** infants face challenges related to fluid and heat loss as well as skin injury in the initial days of life from extreme anatomical and physiological immaturity of the *** there is an emerging literature on the outcomes of UlBW infants,there is a paucity of evidence to inform practice guidelines for delivering optimal care to this cohort of *** sources A comprehensive review of the literature was performed using the Pubmed and Embase *** keywords included“thermoregulation or body temperature regulation”,“incubator humidity”,“skin care”,“infant,extremely low birth weight”and“ultra-low birth weight infants”.Results Evidences for thermoregulation,incubator humidity,and skincare practices are available for preterm infants weighinglly for UlBW *** on thermoregulation,incubator humidity,or skincare practices had a small sample size and did not include a sub-group analysis for UlBW *** practice recommendations in UlBW infants are adopted from research in very and/or extremely low birth weight *** This narrative review focuses on challenges in thermoregulation,incubator humidity,and skincare practices in UlBW infants,highlights current research gaps and suggests potential developments for informing practices for improving health outcomes in UlBW infants.

关键词： Incubator humidity Neonatal intensive care unit Skincare Thermoregulation Ultra-low birth weight

Effect of cold-working on corrosion induced damage in lug joints

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Defence Technology（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath m.N Chikmath l. murthy H. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

lug joints are preferred joineries for transferring heavy loads to parent components in aerospace *** experience corrosion due to environmental conditions,improper surface finishes and rubbing displacement between the pin and *** causes damage of different sizes and shapes near the *** degradation due to corrosion-induced damage is modelled as a through-pit at one of the identified critical locations through stress *** effect of this pit on fatigue crack initiation life is ***-hole is pre-stressed by cold-working and the benefits of inducing plastic wake on the intended performance of the lug joint during the damages due to corrosion are brought out and compared with non-cold-worked *** analysis is performed on this lug joint with *** results obtained highlight the benefits of cold-working and the methodology can be extended to damage growth and analyse the effect of surface treatments for better structural integrity of components of aerospace vehicles.

关键词： lug joint Corrosion Crack initiation Cold-working Structural integrity

Effect of radiative loss mechanisms on FIR thermometric parameters of Nd^(3+)-doped lithium tellurite glasses

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Journal of Rare Earths 2024年第7期42卷 1250-1257,I0002页

作者： C.Y.morassuti A.P.l Silva l.A.O.Nunes S.m.lima l.H.C.Andrade Optical and Photothermal Spectroscopy Group(GEOF) Center for Studies in Natural Resources(CERNA)State University of Mato Grosso do Sul(UEMS)C.P.351DouradosMSBrazil Renato Archer Information Technology Center Dom Pedro I Highway(SP-65)Km 1436-Chácaras Campos dos AmaraisCampinasSPBrazil Institute of Physics of São Carlos University of São PauloSão CarlosSPBrazil

Nd^(3+)-doped tellurite glasses are promising materials for thermometers based on the fluorescence intensity ratio(FIR)***,at high Nd^(3+)concentrations,energy transfer(ET)processes such as optical reabsorption and cross-relaxation can affect the Nd^(3+)emission,which has been little explored in the ***,the present work investigated the use of Nd^(3+)-doped tellurite glass(samples doped with Nd^(3+)at 0.2 mol%,0.5 mol%,2.0 mol%,and 4.0 mol%)in fluorescence thermometers,in the temperature range from 299 to 371 *** results indicate a strong dependence of the FIR parameters on the Nd^(3+)concentration,due to changes in the emission band profiles caused by optical reabsorption of the Nd^(3+)emissions and cross-relaxation processes.A decrease of the relative sensitivity of the ratio^(4)F_(5/2)→^(4)I_(9/2)/^(4)F_(3/2)→^(4)I_(9/2)is observed for samples doped with higher amounts of Nd^(3+).The maximum relative sensitivity at 299 K is 3.00%/K,which is the highest value among the reported Nd^(3+)ions.

关键词： Nd^(3+)-doped tellurite glass Fluorescence intensity ratio Optical thermometry Judd-Ofelt Rare earths

A comprehensive review on the processing-property relationships of laser strengthened magnesium

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Journal of magnesium and Alloys 2024年第1期12卷 1-34页

作者： Alessandro m.Ralls Aaksheta Agnel Pradeep l.menezes Department of mechanical Engineering University of Nevada RenoRenoNV 89557United States

Among the existing series of softer metals,magnesium(mg)has attracted much attention due to its impressive strength-to-weight ***,due to its ease of deformability,mg tends to suffer from rapid degradation in a wide variety of abrasive and electrochemical *** method of improving its surface properties is through surface modification *** the existing techniques,laser shock peening(lSP)has been one of the most widely utilized processes due to its surface-hardening-like *** this understanding,a comprehensive review has yet to exist that encapsulates the strengthening mechanism of lSP for mg and its influence in degradation *** review aims to encapsulate the existing research around the lSP field for ***,an understanding of the surface-strengthening effects in relation to its mechanical,tribological,corrosion,and tribo-corrosion characteristics is ***,the feasibility of lSP for mg materials in critical industries is also *** this work,a novel understanding of lSP for mg can be understood,which can provide a future direction for research in this field.

关键词： laser shock peening magnesium Surface deformation Tribology microstructure