Current density

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Current density is a measure of the density of flow of a conserved charge. Usually the charge is the electric charge, in which case the associated current density is the electric current per unit area of cross section, but the term current density can also be applied to other conserved quantities. (Wikipedia.org)






Conferences related to Current density

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2021 IEEE Photovoltaic Specialists Conference (PVSC)

Photovoltaic materials, devices, systems and related science and technology


2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting

The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science


2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

Energy conversion and conditioning technologies, power electronics, adjustable speed drives and their applications, power electronics for smarter grid, energy efficiency,technologies for sustainable energy systems, converters and power supplies


2020 42nd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC)

The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE


2020 IEEE 16th International Workshop on Advanced Motion Control (AMC)

AMC2020 is the 16th in a series of biennial international workshops on Advanced Motion Control which aims to bring together researchers from both academia and industry and to promote omnipresent motion control technologies and applications.


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Periodicals related to Current density

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Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Applied Superconductivity, IEEE Transactions on

Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission


Biomedical Engineering, IEEE Transactions on

Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.


Circuits and Systems II: Express Briefs, IEEE Transactions on

Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.


Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on

Methods, algorithms, and human-machine interfaces for physical and logical design, including: planning, synthesis, partitioning, modeling, simulation, layout, verification, testing, and documentation of integrated-circuit and systems designs of all complexities. Practical applications of aids resulting in producible analog, digital, optical, or microwave integrated circuits are emphasized.


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Most published Xplore authors for Current density

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Xplore Articles related to Current density

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From Bean's model to the H-M characteristic of a superconductor: some numerical experiments

IEEE Transactions on Applied Superconductivity, 1997

We present a series of two-dimensional simulations in transverse field as validation of a simple finite difference method for the computation of fields inside superconductors described by an extended Bean model.


Numerical Simulation of Shielding Current Density in High-Temperature Superconducting Thin Film

2006 12th Biennial IEEE Conference on Electromagnetic Field Computation, 2006

The numerical code has been developed for simulating the time evolution of the shielding current density in the high-temperature superconducting thin film. When the governing equation of the shielding current density is discretized by use of the finite element method and the completely implicit method, singular integrals appear as coefficients of the nonlinear system. In order to evaluate the coefficients ...


Characteristics of GaAsSb single-quantum-well-lasers emitting near 1.3 μm

IEEE Photonics Technology Letters, 2000

We report data on GaAsSb single-quantum-well lasers grown on GaAs substrates. Room temperature pulsed emission at 1.275 μm in a 1250-μm-long device has been observed. Minimum threshold current densities of 535 A/cm2were measured in 2000-μm-long lasers. We also measured internal losses of 2-5 cm/sup -1/, internal quantum efficiencies of 30%-38% and characteristic temperatures T0of 67/spl deg/C-77/spl deg/C. From these parameters, ...


DC transport measurements at 77 K of high J/sub c/ cryostabilized melt processed YBCO monofilament

IEEE Transactions on Applied Superconductivity, 1991

DC transport critical current density measurements, with J/sub c/ values up to 1.4*10/sup 5/ A/cm/sup 2/ in zero field and 4.4*10/sup 4/ A/cm/sup 2/ in 1 T, performed in liquid nitrogen on melt-processed YBCO fiber from 0 to 1 T, are reported. The measurement technique is described, and the effects of contact heating and cryostabilization are discussed.<<ETX>>


Transmission of the infinite frequencies by using high-T/sub c/ superconductors: Part II: Experiments

Proceedings International University Conference 'Electronics and Radiophysics of Ultra-High Frequencies' (Cat. No.99EX356), 1999

This paper describes a "new formula" to provide the transmission of Ultra-High Frequencies (theoretically up to infinite) by using the High-T/sub c/ Superconductors. The "new formula" has experimentally been proved and justified. In addition, this paper deals with the enhancement of the Einstein's famous formula based on the "new formula". Please note that this paper has been splitted as two ...


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Educational Resources on Current density

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IEEE-USA E-Books

  • From Bean's model to the H-M characteristic of a superconductor: some numerical experiments

    We present a series of two-dimensional simulations in transverse field as validation of a simple finite difference method for the computation of fields inside superconductors described by an extended Bean model.

  • Numerical Simulation of Shielding Current Density in High-Temperature Superconducting Thin Film

    The numerical code has been developed for simulating the time evolution of the shielding current density in the high-temperature superconducting thin film. When the governing equation of the shielding current density is discretized by use of the finite element method and the completely implicit method, singular integrals appear as coefficients of the nonlinear system. In order to evaluate the coefficients accurately, the double exponential formula is applied to the singular integrals. As a result, the shielding current density can be calculated with a high accuracy. By using the code, the noncontact measurement method of the critical current density has been simulated successfully

  • Characteristics of GaAsSb single-quantum-well-lasers emitting near 1.3 μm

    We report data on GaAsSb single-quantum-well lasers grown on GaAs substrates. Room temperature pulsed emission at 1.275 μm in a 1250-μm-long device has been observed. Minimum threshold current densities of 535 A/cm2were measured in 2000-μm-long lasers. We also measured internal losses of 2-5 cm/sup -1/, internal quantum efficiencies of 30%-38% and characteristic temperatures T0of 67/spl deg/C-77/spl deg/C. From these parameters, a gain constant G0of 1660 cm/sup -1/ and a transparency current density J/sub tr/ of 134 A/cm2were calculated. The results indicate the potential for fabricating 1.3-μm vertical-cavity surface-emitting lasers from these materials.

  • DC transport measurements at 77 K of high J/sub c/ cryostabilized melt processed YBCO monofilament

    DC transport critical current density measurements, with J/sub c/ values up to 1.4*10/sup 5/ A/cm/sup 2/ in zero field and 4.4*10/sup 4/ A/cm/sup 2/ in 1 T, performed in liquid nitrogen on melt-processed YBCO fiber from 0 to 1 T, are reported. The measurement technique is described, and the effects of contact heating and cryostabilization are discussed.<<ETX>>

  • Transmission of the infinite frequencies by using high-T/sub c/ superconductors: Part II: Experiments

    This paper describes a "new formula" to provide the transmission of Ultra-High Frequencies (theoretically up to infinite) by using the High-T/sub c/ Superconductors. The "new formula" has experimentally been proved and justified. In addition, this paper deals with the enhancement of the Einstein's famous formula based on the "new formula". Please note that this paper has been splitted as two parts of a whole: "theoretical approach" and "experiments". This part (Part II) of the paper gives the information related to the experiments to prove and justify the "new formula" and consequently to enhance the Einstein's Famous Formula.

  • New measurements of critical data of optimized NBTi superconductors

    The critical data j<inf>c</inf>and B<inf>c2</inf>of NbTi based alloy s.c. material (Ti contents between 39 and 52 wt %) have been determined in the range from 4.2 to 1.8 K. In the case of optimized pinning structure the results are in good accordance with the function B<inf>c2</inf>(T) = B<inf>c2</inf>(O)(1-t<sup>2</sup>). The current density can be described by the scaling law F<inf>p</inf>=c.B<inf>c2</inf><sup>3.5</sup>b(1-b). The stabilisation parameter T<inf>o</inf>(as a function of B and T) is derived from the experimental data. Technical aspects concerning the application of s.c. material are discussed.

  • Numerical Simulation of Inductive Method for Measuring$j_{\rm C}$and Detecting Crack in an HTS Film

    A numerical code has been developed for analyzing the shielding current density in a high-temperature superconducting (HTS) film with multiple cracks. By using the code, the inductive method for measuring the critical current density has been successfully reproduced, and the detectability of the multiple cracks in the HTS film has been investigated. The results of computations show that the estimated value of the threshold current always decreases when the coil approaches a crack. This tendency does not depend on the number of cracks. Moreover, if the crack distance is the outer diameter of the coil or less, it is difficult to detect the multiple cracks. From these results, the outer diameter of the coil must be adopted so as not to affect the cracks and the edges. Therefore, it is desirable to use a smaller the outer diameter as possible.

  • Design optimization of high energy power transistors

    None

  • The critical charge density of 4H-SiC thyristors

    The critical charge density which determines the maximum voltage ramp (dV/dt) of a thyristor, the minimum value of the gate control current, and the parameters of current filamentation has been determined in SiC thyristors both theoretically and experimentally. For 4H-SiC thyristors blocking 300 to 400 V, the critical charge density has been found to be 2/spl times/10/sup 15/ cm/sup -3/ and 10/sup 14/ cm/sup -3/ at a forward voltage of 5 and 100 V, respectively for an operating temperature of 560 K. The critical current density j/sub 0/ below which the turn-on state is localized has also been estimated theoretically and experimentally. While theoretical calculations predict its value to be 2/spl times/10/sup 2/ A/cm/sup 2/, experimental results show a range of 3/spl times/10/sup 2/ to 7.6/spl times/10/sup 2/ A/cm/sup 2/.

  • Superconducting cylinder in a static transverse magnetic field

    A piecewise continuous distribution of the critical currents is proposed to make compatible the Maxwell equations and constitutive equations of superconducting media. A magnetic moment of the infinite superconducting cylinder is calculated on the base of the proposed shell model. Some generalizations of the calculation method are given for superconductors of more complicated shapes.



Standards related to Current density

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IEEE Guide for Gas-Insulated Substations

This guide provides information of special relevance to the planning, design, testing, installation, operation and maintenance of gas-insulated substations(GIS) and equipment. This guide is intended to supplement IEEE Std C37-122- 1993(R2002). In general, this guide is applicable to all GIS above 52 kV. However the importance of the topics covered varies with application category. For example, issues related to advanced ...


IEEE Recommended Practice for Determining the Peak Spatial-Average Specific Absorption Rate (SAR) in the Human Head from Wireless Communications Devices: Measurement Techniques

To specify protocols for the measurement of the peak spatial-average specific absorption rate (SAR) in a simplified model of the head of users of hand-held radio transceivers used for personal wireless communications services and intended to be operated while held next to the ear. It applies to contemporary and future devices with the same or similar operational characteristics as contemporary ...


IEEE Recommended Practice for Measurements and Computations of Radio Frequency Electromagnetic Fields With Respect to Human Exposure to Such Fields, 100 kHz-300 GHz

Revise and develop specifications for preferred methods for measuring and computing external radiofrequency electromagnetic fields to which persons may be exposed. In addition, the document will specify preferred methods for the measurement and computation of the resulting fields and currents that are induced in bodies of humans exposed to these fields over the frequency range of 100 kHz to 300 ...


IEEE Standard for Broadband over Power Line Networks: Medium Access Control and Physical Layer Specifications

The project defines a standard for high-speed (>100 Mbps at the physical layer) communication devices via electric power lines, so-called broadband over power line (BPL) devices. This standard uses transmission frequencies below 100 MHz. It is usable by all classes of BPL devices, including BPL devices used for the first-mile/last-mile connection (<1500 m to the premise) to broadband services as ...


IEEE Standard for Safety Levels With Respect to Human Exposure to Electromagnetic Fields, 0-3 kHz

Develop safety levels for human exposure to electromagnetic fields from 0 to 3kHz. This standard will be based on the results of an evaluation of the relevant scientific literature and proven effects which are well established and for which thresholds of reaction are understood. Field limits will be derived from threshold current densities or internal electric fields.


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