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Online since: November 2015
Authors: Antoniu Turcu, Vasile Adrian Ceclan, Ovidiu Vasile Oprea, Sorin Dumitru Grozav
Introduction In metal processing by plastic deforming, one of the processes that imposes greatly nowadays in the direction of obtaining parts with a specific form as close to the finished product form as possible, directing pressure due to deformation in certain directions during convenient in relation to the geometry of the work piece, is defined as orbital plastic deformation.[1],[2] Focusing the plastic deformation effort in a limited volume and its displacement volume subjected to plastic deformation draw in itself, besides the possibility of routing the deform state on the imposed work piece’s geometry directions, a 5…20 times reduction of the workforce and an rise in the deforming degree [2],[3].
Scheme transmission over kinematics of gear wheels So that the reduction of the worm gears not to be too great and to still have an acceptable engine torque, an asynchronous engine fixed by flange type ASI 132 M was chosen.
In the reduction worm gear, it has been chosen: Ic = it = 6 And will result the following rotations: nt = nI/ic = 237,5 / 6 = 39,58 RPM; nc1 = nII1/it = 237,5 / 6 = 39,58 RPM; nc2 = nII2 / it = 950/6 = 158,3 RPM; nc3 = nII3 / it = 712,5 / 6 = 118, 75 RPM Lobe width calculus The movement in a straight line ⍬M = constant, which leads, still according to Eq 3, to 𝝎1 = 𝝎2; e1 = e2 = e, resulting in straight line that crosses through the origin, inclined to an 𝜼 anglee, where: regarding Ox axys
Using a calculator, it has been determined the width smax for the case when e1 = e2 = 1 and different transmission ratios p/q, data found in Fig. 5.
Online since: February 2008
Authors: F.Y.C. Boey, S.W. Du, Alfred Ling Yoong Tok
Micron-sized boron carbide is currently produced commercially by carbothermal reduction of boron oxide (B2O3) and carbon in an electric arc furnace.
Results & Discussion X-ray diffraction (XRD) data was obtained for boron carbide (B4C) raw materials.
Ehsani, "Synthesis of boron carbide powder by a carbothermic reduction method," Journal of the European Ceramic Society, vol. 24, pp. 3227-3234, 2004
Kim, "Preparation of carbon-free B4C powder from B2O3 oxide by carbothermal reduction process," Materials Letters, vol. 58, pp. 609-614, 2004
Online since: January 2010
Authors: C. Isaac Garcia, Anthony J. DeArdo, Ming Jian Hua, K. Cho
Fig.2 Relation between cumulative rolling reduction and fracture appearance transition temperature (FATT) in Charpy impact test [1]. 30 40 50 60 70 80 - 20 - 40 - 60 - 80 - 100 Reduction below 950ºC or 850ºC (%) 50% shear FATT (ºC) 0.11C-0.3Si-1.3Mn-0.02Nb Finishing rolling temp. 700ºC 950ºC 850ºC 30 40 50 60 70 80 30 40 50 60 70 80 - 20 - 40 - 60 - 80 - 100 - 20 - 40 - 60 - 80 - 100 Reduction below 950ºC or 850ºC (%) 50% shear FATT (ºC) 0.11C-0.3Si-1.3Mn-0.02Nb Finishing rolling temp. 700ºC 950ºC 850ºC 950ºC 850ºC Although controlled rolling does improve resistance to brittle fracture, it also acts to increase the transformation temperature, thereby lowering strength.
Data of the kind shown in Figure 5 show the way to reduce these variations by varying the plate composition and transformation kinetics.
Online since: September 2007
Authors: Yasuto Hijikata, Sandro Solmi, Roberta Nipoti, Fabrizio Tamarri, Michele Sanmartin, Antonella Poggi, Francesco Moscatelli
Recently, nitrogen (N) implantation has been used as pre-oxidation process for the fabrication of 4H-SiC MOS capacitors obtaining a significant reduction of the interface state density in the case of the n-type material, but not in the case of the p-type one.
Integrating in time (0-1 s) and in voltage (between -2 and +2 V) the acquired data, we obtain the total slow trap density (TDst) existing in the oxide.
Taking into account that both the sample #3 and #4 are N implanted and the only difference is the amount of N at the interface (low for #3 and high for #4) we can deduce the importance of the N presence at the SiO2-SiC interface for the Dit reduction as well as the absence of any correlation between the shift of the VFB towards negative voltage and the amount of N embedded in the oxide
Both these processes (samples #2 and #4) give rise to a high N concentration at the interface, thus indicating a determinant role of the N in the reduction of the Dit in the energy range near the conduction band.
Online since: October 2025
Authors: Lukman Noerochim, Diah Susanti, Salamulloh Abdul Hadi
The structure of the NMC based on the literature is hexagonal in shape which refers to the two main peaks namely (0 0 3) and (1 0 4) which correspond to JCPDS Card data No.01-070-4314[8].
It can be seen that the highest oxidation peak was obtained by 3 wt.% variation of TiO2, and the lowest reduction was obtained at 1 wt. % variation of NMC.
The distance from the oxidation peak to the reduction peak can be referred to as the intercalation and deintercalation distance.
In this sample, the lowest distance difference value was obtained at the oxidation-reduction voltage and specific capacity 168 mAh g-1 at 0.5C.
Online since: June 2010
Authors: Ming Der Ger, Yun Feng Chang, Kung Hsu Hou
Therefore, stress may cause micro-hardness value increased, but the experimental data show: the elastic modulus is only slightly reduced, this phenomenon can be inferred that the coating toughness drops result.
Mechanical properties of the Ni-W coating was found by the micro-hardness value may be subject to plating when the cathodic reduction of hydrogen evolution in the role of the phenomenon of residual internal stress resulting from the interference.
NITD plating the Ni-Mo-P film, due to molybdenum in the chemical plating bath is reduced precipitation is more difficult, requiring a greater driving force in order to speed up reduction reactions, in which operating temperature is in the NITD affect the process of chemical reaction kinetics important parameter.
Operation to improve the heating temperature, the reaction driving force would be larger, helping alloy metal particles to accelerate the reduction reaction.
Online since: December 2013
Authors: Zazuli Mohid, Erween Abdul Rahim, N.M. Warap, M.I.S. Ismail, R. Ibrahim
Anderson et al. [1] showed the reduction in cutting force is 25% and increment of tool life between 200 to 300%.
Otherwise, Shi et al. [2] reported the plastic deformation of Inconel 718 materials was reduced due to the reduction of cutting force when the preheat temperature rise between 700 to 800 oC.
Navas el al. [3] shows that the optimum distance of 45 mm between laser spot and cutting tool in turning process has achieved the maximum reduction of cutting force and minimum tool degradation by applied overheating.
Library of Congress Cataloging-in-Publication Data, Springer, New York (2005)
Online since: July 2011
Authors: Qian Wang, Heng Song Ji, Chen Gu, Jing Wang
Results Analysis of the Simulated Computation The simulated computation can generate many data-grams and contour diagrams of thermal parameters distributed according to time-space relationship.
Both Fig. 6 and Fig. 7 shows that the delay of fuel injection can lead to the reduction of the high-temperature region in the cylinder.
The reason lies in that the decrease of injection advance angle may lead to the shortening of the ignition delay period, reduction of the in-cylinder max combustion temperature, shrinking of the in-cylinder high-temperature region, and finally the decrease of NOx generated per cycle.
Conclusion 1) The decrease of injection advance angle may lead to the rise of in-cylinder pressure and temperature at injection, the shortening of ignition delay period, the reduction of combustible gas mixture formed before the combustion, and finally the decrease of max explosion pressure and max combustion temperature.
Online since: March 2011
Authors: Thierry Chassagne, Daniel Alquier, Marc Portail, Anne Elisabeth Bazin, Jean François Michaud, S. Jiao, A. Michon, Marcin Zielinski
This type of strain engineering approach is obviously no longer possible for (111) oriented epiwafers, for which other solutions of curvature reduction were proposed [2].
This conclusion seems contradictory with the usual vision of progressive stress relaxation during the growth, reported for various heteroepitaxial systems [6] – in other materials the reduction of the absolute value of the stress through the layer was systematically found.
In the first case, the reduction of the growth rate leads to an extension of the growth duration and to more effective relaxation, as illustrated in figure 2.
The simulations have to be considered as a qualitative illustration of the creep effect on strain gradient rather than direct fit of experimental data.
Online since: November 2025
Authors: Tetiana Rymar, Volodymyr Rymar
In addition to energy savings and the associated reduction in carbon dioxide emissions, insulation also offers additional benefits: an insulated building or industrial piping system has a more even temperature distribution, resulting in a more comfortable indoor climate or improved system performance. 2 Analysis of Publications Global experience indicates that conserving fuel and energy resources is a strategic priority for any country, and one of the most effective ways to achieve this is by reducing heat energy losses through building envelopes, industrial equipment, and pipelines [2, 4–8].
Industrial power equipment is usually large-scale [4–6, 12], and thermal processes are time-consuming, so for accurate monitoring of their thermotechnical parameters and characteristics, it is advisable to use multichannel measuring systems with the ability to connect sets of primary sensors and instruments in the required quantity to determine the thermophysical properties of the object and collect an array of experimental data for further processing. 3 Aim of Paper The aim of this article is to assess the effectiveness of thermal insulation applied to the surface of steam-water heaters, valves, and pipelines, with the goal of enhancing the safety and energy efficiency of this equipment. 4 Materials and Methods The paper proposes to introduce innovative engineering solutions in a steam-water heater, which is an integral part of a boiler plant designed for district heating.
Fig. 7 shows a thermogram of the heater body ‘A’ on the side of the steam inlet from the reduction-cooling unit ROU 22/6.
Thermal image of the inlet valve mains water to steam-water heater ‘A’ The thermogram in Fig. 8 of the heater ‘B’ on the side of the steam inlet from the reduction-cooling unit ROU 22/6 reveals the hottest spot on its surface, measuring 221.53 °C.
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