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Heat Transfer in Horizontal Copper Tube Heated by Electric Heating Process

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Electrical Science & Engineering 2020年第2期2卷 1-4页

作者： Ramesh Chandra nayak Abinash Sahoo Manmatha KRoul Saroj kuSarangi Mechanical Engineering department Synergy Institute of Engineering&TechnologyDhenkanalOdishaIndia Mechanical Engineering department Bhubaneswar college of EngineeringBhubaneswarOdishaIndia Mechanical Engineering department Gandhi Institute for TechnologicalAdvancementOdishaIndia Mechanical Engineering department National Institute of TechnologyPatna.BiharIndia.

Heat transfer from electrical and electronics component is essential for better performance of that electrical system,The maximum heat transfer from that system results long period *** most of the system base provided for equipments are very small and placed in a very complicated *** heat transfer by forced convection is not easy for that *** heat transfer by natural convection is the familiar technique used in electronics cooling;there is huge group of apparatus that lends itself to natural *** category consist of stand-alone correspondence such as modems and small computers having an array of printed circuit boards(PCB)accumulate within an *** convection heat transfer in heated horizontal duct drive away heat from the interior surface is *** duct is open-ended and round in cross *** test section is heated by provision of heating coils,where constant wall heat flux *** transfer experiment is carried out for channel of 50 *** diameter and 4 mm thickness with length 600 *** of length to diameter of the channel are taken as L/d=*** heat fluxes maintained at q//=300 W/m2 to 3150 W/m2.A methodical investigational record for the local steady state natural convection heat transfer activities is *** wall heating condition on local steady-state heat transfer phenomena are *** present experimental data is compared with the existing theoretical and experimental results for the cases of vertical smooth tubes.

关键词： Heat transfer Components System Horizontal tube Heating coil Heat flux Smooth tubes Test section

Rethinking the solar flare paradigm

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Plasma Science and Technology 2018年第7期20卷 15-21页

作者： d b melrose SIfA School of PhysicsThe University of SydneyNSW 2006Australi

It is widely accepted that solar flares involve release of magnetic energy stored in the solar corona above an active region, but existing models do not include the explicitly time-dependent electrodynamics needed to describe such energy release. A flare paradigm is discussed that includes the electromotive force （EMF） as the driver of the flare, and the flare-associated current that links different regions where magnetic reconnection, electron acceleration, the acceleration of mass motions and current closure occur. The EMF becomes localized across regions where energy conversion occurs, and is involved in energy propagation between these regions.

关键词： solar flares electrodynamics time-dependence

Parallel Perturbed Gauss-Newton State Estimator Based on Fortescue Transformation for Unbalanced Power Systems

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1778-1783页

作者： Izudin džafić Faculty of Electrical Engineering University of SarajevoSarajevo 71000Bosnia and Herzegovina

This letter extends the complex-variable perturbed Gauss-Newton method to estimate the state of unbalanced power systems by exploiting the Fortescue *** proposes a novel and efficient graph-based way to deal with singularities due to zero-sequence network parts bounded with delta transformer windings and isolated from the *** estimator can handle both phasor and complex power *** with the standard complex-variable unbalanced state estimator,it achieves better numerical stability and a speed-up of around three times using a sequential implementation and five times using parallel execution.

关键词： delta-windings Fortescue transformation iterative algorithms least-squares approximation parallel algorithm perturbation methods ill-conditioning state estimation symmetrical components

Response of L V Prasad Eye Institute to COVId-19 outbreak in India:experience at its tertiary eye care centre and adoption to its Eye Health Pyramid

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International Journal of Ophthalmology(English edition) 2021年第1期14卷 1-9页

作者： Rohit C Khanna Prashant Garg Pravin K Vaddavalli Merle Fernandes Suryasnata Rath Sameera nayak Raja Narayanan Rajeev Reddy Pappuru Swathi Kaliki Anthony Vipin das Savitri Sharma Subhadra Jalali Allen Foster Community Eye Health Research Centre Gullapalli Pratibha Rao International Centre for Advancement of Rural Eye CareL V Prasad Eye InstituteHyderabad 500030India Brien Holden Eye Research Centre L V Prasad Eye InstituteHyderabadTelangana 500034India School of Optometry and Vision Science University of New South WalesSydney 2033Australia University of Rochester School of Medicine and DentistryRochesterNY 14642USA Kallam Anji Reddy Campus L V Prasad Eye InstituteHyderabad 500034India Grandhi Mallikarjun Rao Varalakshmi Campus L V Prasad Eye InstituteVishakhapatnamAndhra Pradesh 530040India Mithu Tulsi Chanrai Campus L V Prasad Eye InstituteBhubaneswaraOdisha 751024India Kode Venkatadri Chowdary Campus L V Prasad Eye InstituteVijayawada 521134India department of eyeSmart EMR&AEye L V Prasad Eye Institute 500034India

AIM:To summarize the experience of response to COVId-19 outbreak at a tertiary eye care institute and its network of health facilities in ***:Our responses are based on the principles of social distancing,hand hygiene,respiratory etiquettes,surface disinfection protocol,and rational use of appropriate personal protective equipment(PPE).We describe our response in terms of administrative controls,clinical protocols,staff protection,environmental controls,and social distancing *** also discuss our communication strategies and monitoring systems,to ensure compliance to ***:Administrative control is mainly related to formation of task force and its *** protocols are related to patient triaging methods and clinical examination guidelines in Outpatient,Inpatient and Operating *** protection is focused on training staff on the protocols to be followed in hospital as well as at home,and use of *** protocol is focused on cleaning and disinfectant methods to be used in the *** addition,there are systems for communication as well as monitoring compliance to ***:We hope that these protocols and our experience would help the ophthalmic community globally and serve as a guide to protect ophthalmologists and ophthalmic care personnel,and their patients across the world.

关键词： COVId-19 coronavirus India ophthalmology pandemic care practices pandemic protocols eye care

The sexually dimorphic expression of glutamate transporters and their implication in pain after spinal cord injury

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Neural Regeneration Research 2025年第11期20卷 3317-3329页

作者： Jennifer M.Colón-Mercado Aranza I.Torrado-Tapias Iris K.Salgado Jose M.Santiago Samuel E.Ocasio Rivera dina P.Bracho-Rincon Luis H.Pagan Rivera Jorge d.Miranda department of Physiology University of Puerto RicoMedical Sciences CampusSan JuanPRUSA National Institutes of Health National Human Genome Research InstituteBethesdaMDUSA Universidad Central del Caribe School of MedicineBayamónPRUSA University of Puerto Rico Carolina CampusCarolinaPRUSA Institute of Neurobiology San JuanPRUSA

In addition to the loss of motor function,~60% of patients develop pain after spinal cord *** cellular-molecular mechanisms are not well understood,but the data suggests that plasticity within the rostral,epicenter,and caudal penumbra of the injury site initiates a cellularmolecular interplay that acts as a rewiring mechanism leading to central neuropathic *** can lead to the formation of new connections triggering abnormal sensory *** excitatory glutamate transporters are responsible for the reuptake of extracellular glutamate which makes them a critical target to prevent neuronal hyperexcitability and *** previous studies showed a sexually dimorphic therapeutic window for spinal cord injury after treatment with the selective estrogen receptor modulator *** this study,we investigated the anti-allodynic effects of tamoxifen in male and female rats with spinal cord *** hypothesized that tamoxifen exerts anti-allodynic effects by increasing the expression of glutamate transporters,leading to reduced hyperexcitability of the secondary neuron or by decreasing aberrant *** and female rats received a moderate contusion to the thoracic spinal cord followed by subcutaneous slow-release treatment of tamoxifen or matrix pellets as a control(placebo).We used von Frey monofilaments and the“up-down method”to evaluate mechanical *** treatment decreased allodynia only in female rats with spinal cord injury revealing a sexdependent *** expression profile of glutamatergic transporters(excitatory amino acid transporter 1/glutamate aspartate transporter and excitatory amino acid transporter 2/glutamate transporter-1)revealed a sexual dimorphism in the rostral,epicenter,and caudal areas of the spinal cord with a pattern of expression primarily on *** rodents showed a significantly higher level of excitatory amino acid transporter-1 expression while male rodents showed increased

关键词： allodynia central neuropathic pain EAAT-1/GLAST EAAT-2/GLT-1 glutamate transporters selective estrogen receptor modulator sexual dimorphism spinal cord injury trauma

Inverse Optimal Control of Evolution Systems and Its Application to Extensible and Shearable Slender Beams

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IEEE/CAA Journal of Automatica Sinica 2019年第2期6卷 395-409页

作者： K.d.do A.d.Lucey the department of Mechanical Engineering Curtin University

An optimal(practical) stabilization problem is formulated in an inverse approach and solved for nonlinear evolution systems in Hilbert spaces. The optimal control design ensures global well-posedness and global practical K∞-exponential stability of the closed-loop system, minimizes a cost functional,which appropriately penalizes both state and control in the sense that it is positive definite(and radially unbounded) in the state and control, without having to solve a Hamilton-Jacobi-Belman equation(HJBE). The Lyapunov functional used in the control design explicitly solves a family of HJBEs. The results are applied to design inverse optimal boundary stabilization control laws for extensible and shearable slender beams governed by fully nonlinear partial differential equations.

关键词： Boundary control evolution system Hilbert space inverse optimal control slender beams

接种于水稻的标记含脂螺菌的归宿及其对植物生长、产量和固氮的影响

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核农学通报 1987年第5期 29-31页

作者： d.N.nayak 张凤瑞

现已发现,接种固氮菌对各种禾本科作物和牧草的生长,干重,总氮含量及产量具有促进作用。但不知道提高产量是由固氮所致,还是由于改善了矿质营养,或是由于生长促进物质的缘故。据此,探讨了抗四环素和利福霉紊的含脂螺菌接种到水稻根际之... 详细信息

现已发现,接种固氮菌对各种禾本科作物和牧草的生长,干重,总氮含量及产量具有促进作用。但不知道提高产量是由固氮所致,还是由于改善了矿质营养,或是由于生长促进物质的缘故。据此,探讨了抗四环素和利福霉紊的含脂螺菌接种到水稻根际之后的情况。材料和方法土壤处理将 IRRI 试验田中的粘土彻底混匀,过2mm 筛,再加8kg 干土放入15L 的瓦格

关键词：水稻产量固氮螺菌原子百分超原子%超淹水叶鞘分孽乙炔还原稻株固氮氮代谢

Motion of a spherical particle in a fluid forced vortex by dQM and dTM

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Particuology 2014年第5期12卷 206-212页

作者： M.Hatami d.d.Ganji Esfarayen University Department of Mechanical EngineeringEsfarayenNorth KhorasanIran Mechanical Engineering Faculty Babol University of TechnologyBabolP.O.Box 484Iran

In this study, coupled equations of the motion of a particle in a fluid forced vortex were investigated using the differential transformation method （dTM） with the Pad6 approximation and the differential quadrature method （dO_M）. The significant contribution of the work is the introduction of two new, fast and efficient solutions for a spherical particle in a forced vortex that are improvements over the previous numerical results in the literature. These methods represent approximations with a high degree of accuracy and minimal computational effort for studying the particle motion in a fluid forced vortex. In addition, the velocity profiles （angular and radial） and the position trajectory of a particle in a fluid forced vortex are described in the current study.

关键词： Spherical particle Forced vortex differential transformation method (dTM)Angular velocity differential quadrature method (dQM)

Representation of the quantum mechanical wavefunction by orthogonal polynomials in the energy and physical parameters

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Communications in Theoretical Physics 2020年第1期72卷 66-80页

作者： A d Alhaidari Saudi Center for Theoretical Physics PO Box 32741Jeddah 21438Saudi Arabia

We present a formulation of quantum mechanics based on the theory of orthogonal *** wavefunction is expanded over a complete set of square integrable basis where the expansion coefficients are orthogonal polynomials in the energy and physical *** about the corresponding physical systems(both structural and dynamical)are derived from the properties of these *** demonstrate that an advantage of this formulation is that the class of exactly solvable quantum mechanical problems becomes larger than in the conventional formulation(see,for example,table 3 in the text).We limit our investigation in this work to the Askey classification scheme of hypergeometric orthogonal polynomials and focus on the Wilson polynomial and two of its limiting cases(the Meixner–Pollaczek and continuous dual Hahn polynomials).Nonetheless,the formulation is amenable to other classes of orthogonal polynomials.

关键词： tridiagonal representation orthogonal polynomials recursion relation asymptotics energy spectrum phase shift