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Performance of single wire earth return transformers with amorphous alloy core in a rural electric energy distribution system
Luciano, Benedito Antonio;Inácio, Renato Cucato;Silva, Pablo de Paula e;Guerra, Francisco das Chagas Fernandes;Freire, Raimundo Carlos Silvério;
Materials Research , 2012, DOI: 10.1590/S1516-14392012005000045
Abstract: in this paper are presented some considerations about the performance of single wire earth return amorphous alloy core transformers in comparison with conventional silicon steel sheets cores transformers used in rural electric energy distribution network. it has been recognized that amorphous metal core transformers improve electrical power distribution efficiency by reducing transformer core losses. this reduction is due to some electromagnetic properties of the amorphous alloys such as: high magnetic permeability, high resistivity, and low coercivity. experimental results obtained with some single-phase, 60 hz, 5 kva amorphous core transformers installed in a rural area electric distribution system in northern brazil have been confirming their superior performance in comparison to identical nominal rated transformers built with conventional silicon steel cores, particularly with regard to the excitation power and to the no-load losses.
Development of Rotary Axis for Wire Electrical Discharge Machining (WEDM)
M. Parthiban, C. Manigandan, G. Muthu Venkadesh, M. Ranjith Kumar
International Journal of Engineering Research , 2014,
Abstract: This paper gives an overview of setting up a rotary axis to the existing WEDM machine to investigate the machining parameters in WEDG of harder materials. There are a number of hybrid machining processes (HMPs) seeking the combined advantage of EDM and other machining techniques. One such combination is wire electrical discharge grinding (WEDG), which is commonly used for micro-machining of fine and hard rods. WEDG employs a single wire guide to confine the wire tension within the discharge area between the rod and the front edge of the wire and also to minimize the wire vibration. Other advantages of WEDG include the ability to machine hard- to- machine materials with large aspect ratio
Different sensing mechanisms in single wire and mat carbon nanotubes chemical sensors  [PDF]
P. L. Neumann,V. I. Obreczán,G. Dobrik,K. Kertész,E. Horváth,I. E. Lukács,L. P. Biró,Z. E. Horváth
Physics , 2014, DOI: 10.1007/s00339-014-8626-6
Abstract: Chemical sensing properties of single wire and mat form sensor structures fabricated from the same carbon nanotube (CNT) materials have been compared. Sensing properties of CNT sensors were evaluated upon electrical response in the presence of five vapours as acetone, acetic acid, ethanol, toluene, and water. Diverse behaviour of single wire CNT sensors was found, while the mat structures showed similar response for all the applied vapours. This indicates that the sensing mechanism of random CNT networks cannot be interpreted as a simple summation of the constituting individual CNT effects, but is associated to another robust phenomenon, localized presumably at CNT-CNT junctions, must be supposed.
Quantum Wire as Open System  [PDF]
Marcin Wiesniak
Physics , 2007,
Abstract: The faithful exchange of quantum information will soon become one of the challenges of the emerging quantum information technology. One of the possible solutions is to transfer a superposition through a chain of properly coupled spins. Such a system is called a quantum wire. We discuss the transfer in a quantum wire \cite{christ,niko1,niko2}, when the process of thermalization of the state takes place together with the free evolution. We investigate which encoding scheme is more faithful in certain thermal conditions.
Dependent of electrical resistivity of thin wire on magnetic field and temperature  [cached]
E. Sadeghi,M. Zare
Iranian Journal of Physics Research , 2006,
Abstract: Variation of electrical resistivity of Bismuth nanowire versus magnetic field the and temperature are considered. We study the size effect and surface scattering of the carrier in thin wire for systems with ellipsoidal fermi surfaces. Results are in good agreement with experimental points.
A rare cause of foreign body in the urethra: Electrical wire
Halit Baykan,Samet Vasfi Kuvat,Mehmet Bozkurt,Emin Kap?
Dicle Medical Journal , 2010,
Abstract: In adults, urethral foreign body is commonly observed with mental disorder, psychiatric or sexual behavior disturbance. In this paper, we reported a case which electrical cable wire was inserted into the urethra by the husband
Structure And Properties of Nanoparticles Formed under Conditions of Wire Electrical Explosion  [PDF]
Y. -S. Kwon,A. Ilyin,D. Tikhonov,V. An,A. Godimchuk,L. O. Tolbanova
Physics , 2007,
Abstract: Structure and properties of nanoparticles formed under conditions of wire electrical explosion were studied. It was shown that the state of WEE power particles can be characterized as a metastable state. It leads to an increased stability of nanopowders at normal temperatures and an increased reactivity during heating, which is revealed in the form of threshold phenomena.
Friedel Sum Rule for single channel quantum wire  [PDF]
Swarnali Bandopadhyay,P. Singha Deo
Physics , 2002, DOI: 10.1103/PhysRevB.68.113301
Abstract: Elastic scattering in a quantum wire has several novel features not seen in 1D, 2D or 3D. In this work we consider a single channel quantum wire as its application is inevitable in making devices based on quantum interference effects. We consider a point defect or a single delta function impurity in such a wire and show how some of these novel features affect Friedel-sum-rule (FSR) in a way, that is quite unlike in 1D, 2D and 3D.
Evidence of polariton induced transparency in a single organic quantum wire  [PDF]
F. Dubin,J. Berrehar,R. Grousson,M. Schott,V. Voliotis
Physics , 2005, DOI: 10.1103/PhysRevB.73.121302
Abstract: The resonant interaction between quasi-one dimensional excitons and photons is investigated. For a single isolated organic quantum wire, embedded in its single crystal monomer matrix, the strong exciton-photon coupling regime is reached. This is evidenced by the suppression of the resonant excitonic absorption arising when the system eigenstate is a polariton. These observations demonstrate that the resonant excitonic absorption in a semiconductor can be understood in terms of a balance between the exciton coherence time and the Rabi period between exciton-like and photon-like states of the polariton.
REMEDY OF WIRE LAG IN WIRE ELECTRICAL DISCHARGE MACHINING (WEDM)
S. K. SINHA
International Journal of Engineering Science and Technology , 2010,
Abstract: WEDM is extensively used these days for generating complex geometries with tight tolerances on difficult-tomachine materials. Therefore, demand for improvement in precision has been ever increasing. The main source of inaccuracy is wire-lag, the cause and effect of which is well-known. Research has been going on to overcome this drawback. So far, the techniques suggested for improvement in accuracy are, in general, based on monitoring the machining process at hardware-level, which is not only tedious but involves extra expenditure also. In the present paper, a software approach for improvement in accuracy is described, which does not require any additional investment on the machine, and still gives very good results.
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