Search Results

1 - 10 of 158 items :

  • "current density" x
Clear All

://alaeddin.cc.selcuk.edu.tr/&ttilde;ekbil/eylul2007.htm. http://alaeddin.cc.selcuk.edu.tr/&ttilde;ekbil/eylul2007.htm http://www.ansoft.com/products/em/maxwell Selection of Spot Welding Electrodes, Resistance Welding Equipment & Suppply Company http://www.spotweldequip.com/_vti_bin/shtml.exe/search.htm DIVIGALPITIYA, R.: Electrical Characteristics of Contacts Made With Anisotropic Conductive Adhesives: Current Density Distributions at the Contact, IEEE Transactions on Components and Packaging Technologies 31 No. 1 (March 2008).

Abstract

The influence of pH and current density on the structural and magnetic behavior of soft magnetic Co-Ni-Fe alloy thin films has been studied. The effect of pH and current density on the compositional, structural, and magnetic properties of the as-obtained films was investigated by EDX (energy dispersive analysis by X-rays), XRD (X-ray diffractometer) and VSM (vibrating sample magnetometer). The EDX results revealed that at the optimized deposition conditions, nickel content was low compared with cobalt and ferrous content. X-ray diffraction patterns revealed that the deposited films have polycrystalline nature with mixed (fcc-bcc) cubic structure and small crystallite size (<20 nm). The films prepared in optimized conditions exhibit high saturation magnetization (4πMs value above 2T) and low coercivity (below 160 A/m), which may be due to the reduced crystallite size.

in low concentrations of H2 at a high current density. Intern. J. Hydrogen Energy 36, 8461–8467. DOI: 10.1016/j/ijhydene.2011.04.046. 11. Brus, G., Miyoshi, K., Iwai, H., Saito, M. & Yoshida, H. (2015). Change of an anode’s microstructure morphology during the fuel starvation of an anode-supported solid oxide fuel cell. Intern. J. Hydrogen Energy 40, 6927–6934. DOI: 10.1016/j/ijhydene.2015.03.143. 12. Sarantaridis, D., Rudkin, R.A. & Atkinson, A. (2008). Oxidation failure modes of anode-supported solid oxide fuel cells. J. Power Sources 180, 704–710. 13

The Effect of Electrochemical Machining on the Fatigue Strength of Heat Resistance Alloys

Electrochemical Machining (ECM) provides an economical and effective method for machining high strength, heat-resistant materials into complex shapes such as compressor and turbine blades, dies, molds and micro cavities. ECM is performed without physical contact between the tool and the workpiece in contrast to the mechanical machining, and without strong heating in the machining zone in distinction to the methods such as EDM. Therefore, no surface metal layer with mechanical distortion, compressive stresses, cracks, and thermal distortion forms in ECM. ECM is often used even for removing a defective layer, which has been formed in EDM, with the aim to improve the surface integrity. However, sometimes the intergranular attack occurs in ECM. This may reduce the performance of machined parts and lead to the decreasing of fatigue strength.

In this paper, the effects of ECM on fatigue strength of heat resistant alloys such as nickel-base alloys and titanium alloys are presented. The problems of the intergranular attack, hydrogen embrittlement and surface roughness as result of ECM parameters are described.

Abstract

We present the design of a tri-band E-shaped printed antenna with C-shaped slots. A Rectangular patch etched with an n-shaped slot is added at the back of the substrate to enhance the bandwidth and the return losses of the resonant bands - particularly, that of the second band. Our antenna is designed to operate at 1.51/2. 46/6.11 GHz. As can be observed from the experimental results, it has 10 dB bandwidths of 157 MHz (1.416 to 1.573 GHz) 358 MHz (2.221 to 2.579 GHz) and 367 MHz (5. 918 – 6. 285 GHz) The first two bands cover the LTE, Bluetooth, IEEE 802.15.4 ZigBee and IEEE 802.11 WLAN applications. The third resonant band covers the unlicensed 6 GHz band which is widely implemented in wireless power transmission, as well as, RFID and satellite communications. In order to ease wireless congestion, the 6 GHz band is also currently being considered by the FCC to be opened up for the use of WiFi applications. Our antenna is fabricated on a single-sided FR4-epoxy, and it constitutes a compact size of 34 mm × 36 mm × 1.6 mm or 0.17λ × 0.18λ times0.0081λ, (based on the 1.51 GHz lowest resonant frequency) The antenna exhibits omnidirectional radiation patterns at the three resonant bands.

Abstract

Vliv střídavého indukovaného proudu na korozní rychlost oceli St3 a 17GS byl pozorován v simulovaných půdních elektrolytech typických pro Ukrajinu. Ocel St3 je citlivější na přirozené korozní napadení v půdě i na napadení vyvolané střídavým proudem. Byla stanovena nejhorší prostředí z hlediska koroze v elektrolytech obsahujících chloridy či směs chloridů se sírany.

pipelines”, Technical Specification, CEN - European Committee for Standardization, 2006 . [18] Poberezhny, L., Maruschak, P., Hrytsanchuk, A., Mischuk, B., Draganovska, D., & Poberezhna, L. “Impact of AC current density on material corrosion of distribution pipelines”, Koroze a ochrana materialu 61(5), pp. 178 – 184, 2017 . DOI: 10.1515/kom-2017-0023 [19] Kryzhanivs’kyi, E. I., Hrabovs’kyi, R. S., Fedorovych, I. Y., Barna, R. A. “Evaluation of the Kinetics of Fracture of Elements of a Gas Pipeline after Operation”, Materials Science 51(1), pp. 7 – 14, 2015 . [20

electric field. Notice that the electric field is not shown in the plane between the dots since it is too large. Fig.6 The electric current density in the wound area with a Procellera ® wound dressing applied with Zn closest to the wound edge. The current density approaches 1 A/cm 2 in the region between the dots (solid blue) and falls off quickly in the perpendicular direction (dashed red). Especially when going down into the dermis, which has a low conductivity compared to the wound fluid. The thickness and electrical properties of the different strata given in

, which can be either attractive or repulsive depending on the signs of interacting charges. Substituting Eq. 2 into Eq. 1 we can represent the stationary current density, J , as: (3) J = − q D ( d   c d x + c d   E d   x ) = − q D e − E d ( c   e E ) d   x $$J=-qD\left( \frac{\text{d}\,c}{\text{d}x}+c\frac{\text{d}\,E}{\text{d}\,x} \right)=-qD{{\text{e}}^{-E}}\frac{\text{d}\left( c\,{{\text{e}}^{E}} \right)}{\text{d}\,x}$$ where the dimensionless energy variables are: (4) E ( x ) = q V ( x ) k T + W ( x ) k T $$E\left( x \right)=\frac{qV\left( x \right

-pane ➝ Study Settings ➝ Frequency, enter the frequency you want to use for the simulation. Set this to 10000. In Physics Selection, make sure that only ec have Use in this study checked. This is enough information for MPH to do a simulation. Out of this simulation we can get transfer impedance, current densities, potentials and so on. But we can not get sensitivity, volume impedance density, or information on how much a given part is contributing. To get this we must set up another study step: Rigth-click the Study-node and select Study Steps ➝ Frequency Domain. In