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Journal articles on the topic 'Charge Weld'

Author: Grafiati

Published: 23 June 2021

Last updated: 1 February 2022

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1

Sapchenko, Igor G., Sergey G. Zhilin, Oleg N. Komarov, and Evgeny E. Abashkin. "PROPERTIES OF A WELD JOINT PRODUCED BY A THERMITE CHARGE." Scholarly Notes of Komsomolsk-na-Amure State Technical University 1, no. 9 (March 30, 2012): 100–105. http://dx.doi.org/10.17084/2012.i-1(9).15.

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2

Chen, Liang, Guo Qun Zhao, and Ting Ting Wang. "Effects of Process Parameters on Charge Weld Length during Multi-Hole Porthole Die Extrusion." Applied Mechanics and Materials 703 (December 2014): 141–45. http://dx.doi.org/10.4028/www.scientific.net/amm.703.141.

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The evolution of charge weld during multi-hole porthole die extrusion was studied by means of finite element simulation and Taguchi’s design. Moreover, based on S/N analysis, the optimal process parameters that can reduce the charge weld length was obtained, where the billet diameter is 100 mm, extrusion speed is 2.0 mm/s, tool temperature is 430 °C and billet temperature is 465 °C. The accuracy and effectiveness of such optimal process parameters were also verified. The purpose of the present study is to provide some information about the controlling of charge weld for extrusion engineers.

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3

Lu, W., Y. M. Zhang, and John Emmerson. "Sensing of weld pool surface using non-transferred plasma charge sensor." Measurement Science and Technology 15, no. 5 (April 21, 2004): 991–99. http://dx.doi.org/10.1088/0957-0233/15/5/031.

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4

Lu, Wei, Y. M. Zhang, and John Emmerson. "Adaptive Nontransferred Plasma Charge Sensor and Its Applications." Journal of Manufacturing Science and Engineering 129, no. 1 (June 28, 2006): 180–89. http://dx.doi.org/10.1115/1.2401627.

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Practical welding control systems require durable/compact sensors to sense the welding process and appropriate control algorithms to produce smooth welds. A novel arc welding sensor, referred to as nontransferred plasma charge sensor, which requires no additional attachment to the torch, has been proved to be reliable for weld pool surface sensing. Aiming at eliminating the effect of manufacturing conditions on the sensor performance, this paper proposes two simple yet effective methods. Specifically, reference signals are sampled either from the bottom or the top surface of the work-piece and used to define relative signals, which can measure the depth of the weld pool with better accuracy. Using improved sensing methods, two groups of welding control experiments, keyhole plasma arc welding and all-position pipe welding, have been conducted, and the effectiveness of the developed sensing/control systems in producing quality welds under various conditions is verified.

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5

Reggiani, Barbara, and Lorenzo Donati. "Experimental, numerical, and analytical investigations on the charge weld evolution in extruded profiles." International Journal of Advanced Manufacturing Technology 99, no. 5-8 (August 22, 2018): 1379–87. http://dx.doi.org/10.1007/s00170-018-2595-4.

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6

Ali, Afsar, and Dave Farson. "Statistical Classification of Spectral Data for Laser Weld Quality Monitoring." Journal of Manufacturing Science and Engineering 124, no. 2 (April 29, 2002): 323–25. http://dx.doi.org/10.1115/1.1455028.

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Signals from several sensors were employed for real-time laser weld quality monitoring. Sheet-metal butt-joint laser welds of three quality classes (full penetration, partial penetration, gapped) were produced in experimental trials. Optical, air-born acoustic and plasma charge signals acquired during welding were subsequently Fourier-transformed and the spectra were analyzed individually to determine relationships to laser weld quality. The frequency bands most highly correlated to weld quality were identified by stepwise linear discriminant analysis (LDA) of the spectra. Testing of the quality discriminators formulated by LDA of the spectral data showed that the acoustic signal was most reliably correlated with weld quality. Fusing the data from all three sensors prior to LDA analysis produced a discriminator that had about the same reliability as one based on acoustic data alone.

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7

De Sanctis, M., L. Paganini, A. Solina, and R. Valentini. "Disbonding of type 347 weld overlays induced by postweld heat treatments and hydrogen charge." Journal of Heat Treating 7, no. 1 (March 1989): 35–47. http://dx.doi.org/10.1007/bf02833186.

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8

Nanninga, N., C. White, and R. Dickson. "Charge Weld Effects on High Cycle Fatigue Behavior of a Hollow Extruded AA6082 Profile." Journal of Materials Engineering and Performance 20, no. 7 (September 10, 2010): 1235–41. http://dx.doi.org/10.1007/s11665-010-9755-5.

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9

Negozio, Marco, Riccardo Pelaccia, Lorenzo Donati, Barbara Reggiani, Tommaso Pinter, and Luca Tomesani. "Finite Element Model Prediction of Charge Weld Behaviour in AA6082 and AA6063 Extruded Profiles." Journal of Materials Engineering and Performance 30, no. 6 (April 16, 2021): 4691–99. http://dx.doi.org/10.1007/s11665-021-05752-x.

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10

Zhou, Pei Yun, Jing Li, Ning Min Shen, and Fang Li. "An Improved Weld Seam Extraction Method Using Saliency Detection for Pipe-Line Welding Based on GMAW and Passive Light." Applied Mechanics and Materials 598 (July 2014): 160–63. http://dx.doi.org/10.4028/www.scientific.net/amm.598.160.

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To meet the need of the automation and intelligence of welding process, it’s very important to extract the edge of weld seam accurately for seam tracking. According to the characteristics of GMAW (gas metal arc welding), an image sensing system of weld pool region based on CCD (Charge-coupled Device) is established. An improved method of weld seam extraction is presented. Firstly, weld pool region localization method using saliency detection is proposed, and weld seam region is obtained from the right edge of weld pool, then Sobel transformation and computation model is used to extract the edge of weld seam. Experimental results show that our method can obtain a more accurate weld seam edge and cost less than other method.

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11

Peremit’ko, V. V., V. D. Kuznetsov, and A. N. Sokol. "Modifying Charge Input Optimization in Arc Surfacing with the Controlling Magnetic Influence." Applied Mechanics and Materials 682 (October 2014): 298–303. http://dx.doi.org/10.4028/www.scientific.net/amm.682.298.

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The hydrodynamic processes modelling in the weld pool under the influence of the electromagnetic bulk force was carried out. For the approximation of the model equations the finite difference method was used. The resulting system of linear algebraic equations was solved by simple iteration. The finding served the basis for determining the optimal scheme supply of powder material adding for the modification and alloying of the weld (build-up) metal in the presence of an external magnetic field.

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12

Engelhardt, Marcus, Daniel Behne, Norbert Grittner, André Neumann, Wilfried Reimche, and Christian Klose. "Non-destructive Testing of Longitudinal and Charge Weld Seams in Extruded Aluminum and Magnesium Profiles." Materials Today: Proceedings 2, no. 10 (2015): 4866–73. http://dx.doi.org/10.1016/j.matpr.2015.10.037.

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13

Zhu, Xin Ming, Hao Zhan, and Zhi Gang Jiang. "Numerical Simulation of the Influence of Weld Model on the Response of Stiffened Plates under Blast Loading." Applied Mechanics and Materials 204-208 (October 2012): 943–48. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.943.

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Stiffened plates are used in a wide variety of engineering structures. Based on the published experiments, two kinds of weld models were established in simulation and the influence of weld model on the response of stiffened plates under blast loading was analyzed. The results show that the deflections and failure modes of stiffened plates from simulation are in good agreement with those from experiments, and that the weld model has little influence on the deformation and the critical charge of the plates. A simple model can be used for analyzing the large stiffened structures under blast loading.

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14

Bakker, A. J. den, L. Katgerman, and S. van der Zwaag. "Analysis of the structure and resulting mechanical properties of aluminium extrusions containing a charge weld interface." Journal of Materials Processing Technology 229 (March 2016): 9–21. http://dx.doi.org/10.1016/j.jmatprotec.2015.09.013.

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15

Widyianto, Agus, Ario Sunar Baskoro, and Gandjar Kiswanto. "Effect of Pulse Currents on Weld Geometry and Angular Distortion in Pulsed GTAW of 304 Stainless Steel Butt Joint." International Journal of Automotive and Mechanical Engineering 17, no. 1 (March 30, 2020): 7687–94. http://dx.doi.org/10.15282/ijame.17.1.2020.16.0571.

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In this research, the effect of pulse currents on the weld geometry and angular distortion in pulsed GTAW (PGTAW) process in 3 mm thick SS-304 autogenous butt weld joint was investigated. Welding method uses pulse current and continuous current. The mean current and welding speed were kept constant with the peak current and base current were varied. During pulsed GTAW process, the arc condition was captured directly using a charge-coupled device (CCD) camera. Weld geometry was carried out using a digital microscope. Distortion was measured using Coordinate Measuring Machine (CMM). The results show that the peak current and base current have an influence on weld geometry and angular distortion. The weld geometry on pulsed GTAW was produced wider of weld bead width than continuous GTAW. However, angular distortion on continuous GTAW was higher than pulsed GTAW. Pulsed GTAW can widen the weld bead by 0.57% - 25.09%, but can reduce distortion by 15.15%-88.17%. As compared with weld geometry to the continuous GTAW, the widest result occurs at peak current 212A and base current 40A. The smallest of distortion on pulsed GTAW was achieved at peak current 138A and base current 80A.

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16

Crosio, Michele, David Hora, Christoph Becker, and Pavel Hora. "Realistic representation and investigation of charge weld evolution during direct porthole die extrusion processes through FE-analysis." Procedia Manufacturing 15 (2018): 232–39. http://dx.doi.org/10.1016/j.promfg.2018.07.214.

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17

Das, Debasish, Dilip Kumar Pratihar, and Gour Gopal Roy. "Effects of space charge on weld geometry and cooling rate during electron beam welding of stainless steel." Optik 206 (March 2020): 163722. http://dx.doi.org/10.1016/j.ijleo.2019.163722.

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18

Boczkal, Grzegorz, and Karolina Dadun. "Non-Equilibrium Crystallization with Magnetic Stirring in Pt/Inconel 625 Micro-Joints Welded by Capacitor Charge." Journal of Non-Equilibrium Thermodynamics 44, no. 1 (January 28, 2019): 91–98. http://dx.doi.org/10.1515/jnet-2018-0025.

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Abstract The presented work describes issue of magnetic mixing and segregation of metals during the formation of micro-joints using the capacitor welding method. The key aspect is the very short weld time, which is below 2 ms. The Pt/Inconel 625 micro-joints have been tested in the work. The 100-μm platinum wire was welded to Inconel 625 with the same thickness. During the welding process, the capacitor discharge characteristics were recorded with the oscilloscope. This allowed for a mathematical description of phenomena occurring during the creation of the micro-joint. Observations of the micro-structures from the scanning electron microscope in BSE mode confirmed the strong micro-segregation of the joint components. In addition, the effect of magnetic mixing of the joint components was observed. Weld geometry results obtained from the calculations showed good compliance with the real joint micro-structure observation data.

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19

VYALKOV, V. G., S. N. GLAZUNOV, and P. A. TSIRKOV. "RESTORATION OF WORN SURFACES FROM CAST IRON AND STEEL PARTS BY ELECTRIC ARC WELDING WITH FERROMAGNETIC CHARGE." Fundamental and Applied Problems of Engineering and Technology 4, no. 2 (2020): 112–16. http://dx.doi.org/10.33979/2073-7408-2020-342-4-2-112-116.

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In experiment, worked out the parameters of deposition and the composition of the ferromagnetic charge, which ensure a defect-free weld layer (no pores, inclusions, hot and cold cracks) with a surface hardness of 52- 56 HRC without additional technological measures (heating products) and subsequent heat treatment.

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20

Thongchuea, Nutchanat, Eakkachai Warinsiriruk, and Yin-Tien Wang. "Laser Welding on Cerclage Wire Joining in Femur Surgery." Applied Sciences 10, no. 7 (April 1, 2020): 2407. http://dx.doi.org/10.3390/app10072407.

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Stainless steel wires with fiber-laser welding on lap joints are first proposed in this study to be used as cerclage wire joints for modern femur surgery, because of their potentially larger joint strength and less loosening failure than traditional joint devices. In this feasibility study, an experiment was set up to determine adequate parameters for the laser welding process in order to ensure that the wire joint of cerclage has good weld appearance, free oxidation, and suitable joint strength. A stainless steel wire 316L with a diameter of 1.6 mm, flare-welded on lap joint was used in the experiment as a specimen cerclage wire joint. Two major effective parameters were chosen for controlling a suitable fusion weld, including charge voltage and multiple frequencies of the laser irradiation. The adequate area of the laser parameters was determined from the experiment, including the ranges of charge voltage, multiple frequencies, and pulse width. The suitable welded lengths of specimens were also studied in the mechanical test to validate the joint strength. Suggested welded length has a better tensile strength than traditional cerclage joints. The paper concludes that the stainless wire joints with a fiber laser weld represents a promising alternative to traditional cerclage joint devices for modern femur surgery.

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21

Honma, Y., and R. Kayano. "Study of Embrittlement of the 2.25Cr-1Mo-V Steel Weld Metal by Hydrogen Charge and High Pressure Hydrogen Gas Environment." Procedia Engineering 130 (2015): 571–82. http://dx.doi.org/10.1016/j.proeng.2015.12.269.

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22

Lou, Shumei, Anning Wang, Shuai Lu, Guangxin Guo, Chuandong Qu, and Chunjian Su. "Tensile property and micro-texture evolution of the charge weld in a billet-to-billet extrusion of AA6061 aluminum profile." International Journal of Advanced Manufacturing Technology 103, no. 1-4 (April 4, 2019): 1309–23. http://dx.doi.org/10.1007/s00170-019-03573-w.

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23

Valberg, Henry, and Yawar Abbas Khan. "On the Fundamental Mechanism of Seam Welding in Extrusion of Aluminum Alloys." Key Engineering Materials 504-506 (February 2012): 529–34. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.529.

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In extrusion of hollow Al-profiles two kinds of pressure welds are present inside the extrusion. One is called the charge weld (CW) and forms across the boundary interface between two billets extruded in sequence. The other is the seam weld (SW) which extends longitudinally along the extruded profile and the extrusion metal behind each die bridge. It is considered to form because of the splitting of the extrusion metal over the die bridge into metal streams which flow past the bridge and rejoin as they encounter behind the bridge. Over the time attempts have been made to explain the mechanics of extrusion welding for both the CW and the SW. Still there is lack of understanding of how these welds form, the main reasons for this is that the deformation conditions around a die bridge are complex and difficult to investigate. Because of the recent advancement of two technological fields, experimental grid pattern analysis and simulation of metal flow by FEA; new tools for analysis of the mechanics of formation of the SW and the CW are now available. The simplest possible case of 2D-extrusion seam welding is considered here and an attempt is made to describe the fundamental deformation mechanisms present when this weld forms behind a butt-ended die bridge.

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24

Makienko, V. M., L. B. Leont’ev, P. V. Sokolov, and A. V. Atenyaev. "Development of Flux Cored Wire Using Concentrates and Mining Industry Waste Products in the Far East." Materials Science Forum 945 (February 2019): 1024–29. http://dx.doi.org/10.4028/www.scientific.net/msf.945.1024.

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The paper considers the problem of the development of new flux cored wires manufactured from concentrates and waste products of the mining industry of the Far Eastern Region. The authors provide the results of the analysis of the phase and chemical compositions of mineral raw materials, and experimental research. We have developed diagrams that offer a selection of different compositions of charge mixtures depending on the properties demanded from the weld deposited metal. We have also developed a flux cored wire for deposit welding of the automatic coupling locks of the rolling stock that ensures the hardness of the weld metal 500 НВ retaining high parameters of notch toughness (impact strength).

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25

Bae, K.-Y., and S.-J. Na. "A Study of Vision-Based Measurement of Weld Joint Shape Incorporating the Neural Network." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 208, no. 1 (February 1994): 61–69. http://dx.doi.org/10.1243/pime_proc_1994_208_060_02.

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Visual sensing of the surface geometry is often necessary to inspect and evaluate the quality of welded joints as well as to sense the transient distortion of a structure during welding for the feedback of its current geometry. This investigation presents a simple and non-contact digitization method of the vision-based system for measuring the three-dimensional surface geometry of the object distorted by welding. Its basic principles are based on the equation derived from the geometric optics, for which the illumination of the laser beam was controlled in the form of the projected plane. This method utilized a 10 mW He-Ne laser for the structured light and a charge coupled device (CCD) camera as the vision sensor. When the laser stripe is projected on to the weldment, a minute deviation from the perfect plane existing on the specimen surface causes a distortion of the stripe. The shape and amount of the weldment distortion can be then calculated by analysing the distorted laser stripe. In this study, a neural network was proposed and implemented for recognizing the laser stripe features from the image plane. A calibration scheme of corresponding an image to the world position was also adopted for determining the sectional features of the welding distortion. The feasibility of determining the welding distortion by the proposed vision-based system was demonstrated through the experiments with various types of specimen.

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26

Urbanovich, N. I., V. V. Melnichenko, K. E. Baranovsky, E. V. Rozenberg, A. A. Radchenko, and Z. V. Ignatovich. "STUDY OF THE EFFECT OF MODIFIERS WITH ULTRADISPERSED PARTICLES IN THE COATING OF THE ELECTRODE FOR MANUAL ARC WELDING ON THE TECHNOLOGICAL PARAMETERS IN MANUFACTURE OF THE ELECTRODE." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 2 (July 7, 2018): 108–12. http://dx.doi.org/10.21122/1683-6065-2018-2-108-112.

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It is established that inclusion of the modifier into the electrode coating allowed to change the grains of the weld metal from 20–60 to 10–30 mm, to change its morphology and to improve the welding-technological properties of the coated electrode. It is shown that the modifying additive introduced into the coating of a welding electrode containing ultrafine particles in an amount of 1% of the weight of the dry charge had not deteriorated the technological parameters during manufacture, and the integral index of the different thickness (Desp) of electrodes with standard and experimental coatings did not add to the accepted value of 0.05. This indicates that the quality of the lubricating mass, its properties, the stability of the mass flow from the spinneret are satisfactory for both batches.

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27

Novac, Mariana Neli, and Bogdan Novac. "Researches on the Welding Behaviour of Two Brands of High-Alloy and High-Efficiency Electrodes Used to Charge High Wear Parts." Ovidius University Annals of Constanta - Series Civil Engineering 22, no. 1 (December 1, 2020): 71–78. http://dx.doi.org/10.2478/ouacsce-2020-0008.

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Abstract The research performed and presented in this paper, aims to verify the welding behavior of electrodes developed experimentally, as well as the possibility of their use in production. A group of two electrodes produced by Bohler Company, Gridur 24 and B.M.N were taken as reference, in order to compare them in terms of the mechanical properties of the deposited metal, with the experimentally developed electrodes EICr12Fe and EIMn13SiFe. They were made determinations of the chemical composition of the deposited metal with the two types of electrodes, measurements regarding the hardness of the metal deposited, comparative determinations of the structure of the weld deposit, and of the welding penetration, determinations of the deposition yield and verification of the welding behavior.

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28

Alghannam, Lu, Ma, Cheng, Gonzalez, Zang, and Li. "A Novel Method of Using Vision System and Fuzzy Logic for Quality Estimation of Resistance Spot Welding." Symmetry 11, no. 8 (August 2, 2019): 990. http://dx.doi.org/10.3390/sym11080990.

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Finding a reliable quality inspection system of resistance spot welding (RSW) has become a very important issue in the automobile industry. In this study, improvement in the quality estimation of the weld nugget’s surface on the car underbody is introduced using image processing methods and training a fuzzy inference system. Image segmentation, mathematical morphology (dilation and erosion), flood fill operation, least-squares fitting curve and some other new techniques such as location and value based selection of pixels are used to extract new geometrical characteristics from the weld nugget’s surface such as size and location, shape, and the numbers and areas of all side expulsions, peaks and troughs inside and outside the fusion zone. Topography of the weld nugget’s surface is created and shown as a 3D model based on the extracted geometrical characteristics from each spot. Extracted data is used to define input fuzzy functions for training a fuzzy logic inference system. Fuzzy logic rules are adopted based on knowledge database. The experiments are conducted on a 6 degree of freedom (DOF) robotic arm with a charge-coupled device (CCD) camera to collect pictures of various RSW locations on car underbodies. The results conclude that the estimation of the 3D model of the weld’s surface and weld’s quality can reach higher accuracy based on our proposed methods.

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29

Janeček, Michal, Petra Kührová, Vojtěch Mlýnský, Michal Otyepka, Jiří Šponer, and Pavel Banáš. "W-RESP: Well-Restrained Electrostatic Potential-Derived Charges. Revisiting the Charge Derivation Model." Journal of Chemical Theory and Computation 17, no. 6 (May 17, 2021): 3495–509. http://dx.doi.org/10.1021/acs.jctc.0c00976.

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30

Watanabe, Osamu, Takashi Enomoto, Katsuhisa Nishi, Toshiko Matano, and Tohru Tominaga. "Seasonal Change of Germination of Poa crassinervis Honda." Journal of Weed Science and Technology 41, no. 4 (1997): 315–22. http://dx.doi.org/10.3719/weed.41.315.

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31

Dudzik, Krzysztof, and Wojciech Jurczak. "Influence of Friction Stir Welding (FSW) on Mechanical and Corrosion Properties of AW-7020M and Aw-7020 Alloys." Polish Maritime Research 23, no. 3 (September 1, 2016): 86–90. http://dx.doi.org/10.1515/pomr-2016-0036.

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Abstract Friction welding associated with mixing the weld material (FSW - Friction Stir Welding ) is an alternative to MIG and TIG welding techniques for Al-alloys. This paper presents experimental results obtained from static tension tests on specimens made of AW-7020M and AW-7020 alloys and their joints welded by using FSW method carried out on flat specimens, according to Polish standards : PN-EN ISO 4136:2011 and PN-EN ISO 6892-1:2010. Results of corrosion resistance tests are also presented. The tests were performed by using the electrochemical impedance spectroscopy (EIS). EIS measurement was conducted with the use of three-electrode system in a substitute sea water environment (3,5% NaCl - water solution). The impedance tests were carried out under corrosion potential. Voltage signal amplitude was equal to 10mV, and its frequency range - 100 kHz ÷ 0,1 Hz. Atlas 0531 EU&IA potentiostat was used for the tests. For the tested object an equivalent model was selected in the form of a substitute electric circuit. Results of the impedance spectroscopy tests are presented in the form of parameters which characterize corrosion process, as well as on Nyquist’s graphs together with the best-fit theoretical curve. Analysis of the test results showed that the value of charge transfer resistance through double layer , Rct , for the FSW-welded specimen , was lower than that for the basic material, and that much greater difference was found in the case of AW-7020M alloy. The impedance spectroscopy tests showed that both the FSW-welded joints and basic material of AW-7020M and AW-7020 alloys were characterized by a good resistance against electrochemical corrosion in sea water environment , and that FSW-welded joints revealed a greater corrosion rate.. The performed tests and subject-matter literature research indicate that application of FSW method to joining Al-alloys in shipbuilding is rational.

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32

HAMAJIMA, Takumi, Kei AMEYAMA, and Akiyoshi FUJI. "Microstructural Change of Weld Interface in Ti/Al Friction Weld during Heat Treatment." Journal of the Society of Materials Science, Japan 44, no. 505 (1995): 1224–30. http://dx.doi.org/10.2472/jsms.44.1224.

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33

Wang, Shuya, Hong Zheng, Yangyang Yang, Chao Liu, Zhifei Pan, and Quanchao Zhuang. "Morphology control and interface characteristics of well-dispersed nanomaterials in K-ion batteries." RSC Advances 11, no. 49 (2021): 30487–94. http://dx.doi.org/10.1039/d1ra04869d.

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34

Tsui, E. S. M., P. Blood, and A. I. Kucharska. "Charge neutrality in quantum well structures." Semiconductor Science and Technology 5, no. 4 (April 1, 1990): 333–39. http://dx.doi.org/10.1088/0268-1242/5/4/010.

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35

Goodhue, W. D. "Quantum-well charge-coupled devices for charge-coupled device-addressed multiple-quantum-well spatial light modulators." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 4, no. 3 (May 1986): 769. http://dx.doi.org/10.1116/1.583562.

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36

Poznyakov, V. D., A. V. Zavdoveev, A. A. Gajvoronsky, A. M. Denisenko, and A. A. Maksymenko. "Effect of pulsed-arc welding modes on the change of weld metal and haz parameters of welded joints produced with Sv-08kh20N9G7T wire." Paton Welding Journal 2018, no. 9 (September 28, 2018): 7–12. http://dx.doi.org/10.15407/tpwj2018.09.02.

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37

Popov, Igor. "On electromagnetic radiation of individual charges." Proceedings of the Russian higher school Academy of sciences, no. 2 (July 21, 2021): 7–13. http://dx.doi.org/10.17212/1727-2769-2021-2-7-13.

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The aim of the study is to establish the conditions for synchrotron radiation based on significant differences between tangential and centripetal accelerations of electric charges. From the fact that electromagnetic radiation carries away energy, it follows that the energy of the radiating system changes during radiation. Related to this is the following well-known rule: a change in energy is equal to work done. Three relevant theorems are proved. Theorem 1 states that a tangentially accelerated electric charge emits electromagnetic waves. Theorem 2 states that a normally accelerated electric charge does not emit electromagnetic waves. It is a well-known circumstance that the centripetal force does not perform work (since the scalar product of orthogonal vectors must be equal to zero). The proofs of Theorems 1 and 2 are performed in terms of forces. For electric charges, the transition to the terms of accelerations is carried out in accordance with Theorem 3which states that an electric charge satisfies Newton's second law. The tangential acceleration of an electric charge leads to the emission of electromagnetic waves. Generalization of the phenomenon of radiation to acceleration in general, including. normal charge acceleration, is false. The cause of synchrotron radiation should be sought in the tangential acceleration due to Coulomb interactions between the beam charges.

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38

Petrovsky-Shtern, Yohanan. "Ein Tag, der die Welt veränderte." osteuropa 71, no. 1-2 (2021): 87. http://dx.doi.org/10.35998/oe-2021-0007.

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39

Khaledialidusti, Rasoul, and Jon Kleppe. "Surface-Charge Alteration at the Carbonate/Brine Interface During Single-Well Chemical-Tracer Tests: Surface-Complexation Model." SPE Journal 23, no. 06 (August 17, 2018): 2302–15. http://dx.doi.org/10.2118/191356-pa.

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Summary Water chemistry has been shown to affect oil recovery by affecting surface charge and rock dissolution. The single-well chemical-tracer (SWCT) test is a field method to measure residual oil saturation (Sor), in which hydrolysis reaction of an ester has been known as a key process that could displace the equilibrium state of a reservoir by changing formation-water (FW) composition. Because oil mobilization during the SWCT tests causes an error in the measurement of Sor, changes in water chemistry might be a concern for the accuracy of Sor measurements. In our previous work, the extent to which different reservoir parameters might change water composition and the effect of water-chemistry changes on the calcite dissolution and the oil liberation from the carbonate-rock surfaces were extensively evaluated. In this study, the effect of water-chemistry changes on surface-charge alteration at the carbonate/brine interface has been studied by constructing and applying a surface-complexation model (SCM) that couples bulk aqueous and surface chemistry. We present how the pH drop induced by the displacement of the equilibrium state and changes in water chemistry in the formation affect surface charge in a pure-calcite carbonate rock during the SWCT tests. The results show that a pH drop during the SWCT tests while calcium concentration is held constant in the FW by ignoring calcite dissolution yields a less-positive/more-negative surface charge so that wettability of carbonate rock might be altered to a less-oil-wetting state, when the oil is negatively charged. In reality, however, calcite dissolves by water-chemistry changes during the SWCT tests, which leads to an increasing calcium concentration in the FW. Consequently, an SWCT test in carbonates is accompanied by increasing calcium concentration while pH drops, which yields an increase in the surface charge of carbonate rocks. Therefore, the pH drop does not directly affect the surface charge of carbonate rock during an SWCT test, and calcium concentration increased from calcite dissolution could control the surface charge more significantly.

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Duc, Dao Vong, Nguyen Mong Giao, and Tran Thanh Dung. "Charge–mass sum rules for unified spinor fields in extradimensions and the prediction for the existence of tachyon quarks and tachyon leptons." Modern Physics Letters A 34, no. 17 (June 7, 2019): 1950130. http://dx.doi.org/10.1142/s021773231950130x.

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Within the framework of the mechanism proposed in our previous works [Duc and Giao, J. Mod. Phys. 5, 477 (2014); Duc et al., Int. J. Theor. Phys. 54, 1071 (2015); Duc and Giao, Int. J. Theor. Phys. 55, 959 (2016)] for mass and charge creation, we consider the charge and mass spectrum of spinor fields in extradimensions. It is shown that a single spinor field in spacetime with extradimensions corresponds to a set of effective spinor fields in ordinary four-dimensional spacetime with charges and masses obeying the sum rules dictated from some specific assumptions related to the compactification of extradimensions. The obtained results allow us to present an example for unifying six existing flavor quarks, as well as for unifying three existing lepton generators. On the base of the derived charge–mass sum rules, we would predict the existence of some hidden tachyon quarks with fractional charges, as well as some hidden tachyon leptons, neutral or negative charged.

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Bayly, Christopher I., Piotr Cieplak, Wendy Cornell, and Peter A. Kollman. "A well-behaved electrostatic potential based method using charge restraints for deriving atomic charges: the RESP model." Journal of Physical Chemistry 97, no. 40 (October 1993): 10269–80. http://dx.doi.org/10.1021/j100142a004.

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Zavdoveev, A. V., V. D. Poznyakov, S. L. Zhdanov, M. Rogante, and T. Baudin. "Influence of pulsed-arc welding conditions on change of parameters of weld and haz of welded joints and mechanical properties of low-alloy steels." Paton Welding Journal 2020, no. 12 (December 28, 2020): 21–26. http://dx.doi.org/10.37434/tpwj2020.12.03.

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Adhikari, B. R., S. Basnet, H. P. Lamichhane, and R. Khanal. "Variation of Velocity of Ions in a Magnetized Plasma Sheath for Different Magnetic Field." Journal of Nepal Physical Society 6, no. 1 (August 6, 2020): 25–29. http://dx.doi.org/10.3126/jnphyssoc.v6i1.30513.

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The kinetic trajectory simulation method has been used to study ion velocity profile in a plasma sheath for varying magnetic field at fixed obliqueness. As the electrons have higher velocity compared to that of ions the wall is charged up negatively with respect to the core plasma. The negative potential then attracts the ions and repels electrons forming a thin positive space charge region in front of the wall. This positive space charge region, known as the ‘sheath’ separates the negatively charged wall from the quasineutral ‘presheath’ plasma. The ions moving towards the wall have to satisfy the Bohm criterion to ensure the stability of the overall plasma. The mean value as well as oscillation frequency of velocity of ions change as the magnetic field is varied from 1.5 to 10.5 mT. The maximum amplitude of normal component of velocity is almost independent of the magnetic field but the maximum amplitude of other components of velocity change and shows oscillating nature as the magnetic field changes.

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Dușa, Petru, and Radu Baciu Lupașcu. "Analysis of Residual Stresses in Steel Welded Parts Using Ultrasounds." Applied Mechanics and Materials 657 (October 2014): 326–31. http://dx.doi.org/10.4028/www.scientific.net/amm.657.326.

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<span><p><span style="font-family: Times New Roman; font-size: medium;" face="Times New Roman" size="3">Welding is an assembly process used in different industries. The residual stresses influences fatigue behavior, fracture strength, corrosion resistance and for these reasons knowing their values are important. During time, many destructive as well as nondestructive methods to evaluate residual stresses were developed. Stress is evaluated by inducing a sound wave with the frequency of several megahertz into the sample and measuring velocity related parameters. Besides stress which affects sound velocity there are many others characteristics of metals with same influence and for this reason sorting from different influences made the estimation difficult. On another hand ultrasonic technology has many wave modes to investigate materials including bulk wave (longitudinal and shear wave), surface wave (Rayleigh) every mode offering unique parameters for extracting information. Of the several characteristics that may be used to measure stress the most exploited seems to be sound velocity dependence on the elastic modulus. </span>Our research to estimate residual stress into steel welded parts is based on dependence between sound velocity and elastic modulus using longitudinal sound wave. To conduct the experiments was designed sample as a frame. The sample was loaded using adapted equipment and the results were used for FEA tools (SolidWorks SimulationXpress) to obtain the distribution of stresses and displacements. This approach allowed the location of points of interest to the investigation with ultrasound. The ultrasound investigation was made and presented in comparative tables<strong><span style="text-decoration: underline;">. </span></strong>It is found that the variation of the velocity of sound for the two charge states of the piece is, on average, 5.8 per thousand. Particular values of residual stress values are observed for the points corresponding with weld or fusion zone and heat-affected zone. The ultrasonic investigation permits the evaluation of bulk stress state of welded components with acceptable accuracy.</p>

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Zaki, S., Emad Uddin, B. Rashid, A. Mubashar, and Samiur R. Shah. "Effect of liner material and explosive type on penetration effectiveness of shaped charge." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 7 (January 10, 2018): 1375–83. http://dx.doi.org/10.1177/1464420717753233.

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Shaped charges are used in many civilian and military applications. This study focuses on the effects of liner material and the type of explosive on the development of shaped charge jet. This was carried out by experimentation and numerical finite element-based modelling. Shaped charges were tested on a steel plate during the experimentation and the experimental data were used to validate the developed numerical model of the shaped charge. A hydrocode-based finite element model was able to predict the perforation and jet formation for the shaped charge, as well as the characteristics of the holes formed in the target plate. Several variations of the numerical model with the change of liner material and the filled explosive showed that the higher explosive resulted in higher velocity jet. The jet formation and velocity of jet were compared to determine the better performing combination of the material and explosive for the given shaped charge geometry. The underlying mechanisms were discussed in detail and compared with the previous studies.

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Gierus, A. V., and T. G. Gierus. "Charge accumulation effects in quantum-well structures." Semiconductors 40, no. 6 (June 2006): 681–86. http://dx.doi.org/10.1134/s1063782606060133.

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Brookes, Jane. "Vantage point - Managing change well." Nursing Management 21, no. 9 (January 28, 2015): 13. http://dx.doi.org/10.7748/nm.21.9.13.s16.

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Heap, Brian, and Flavio Comim. "Climate Change and Well-Being." International Journal of Public Theology 3, no. 1 (2009): 42–62. http://dx.doi.org/10.1163/156973209x387307.

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AbstractHuman well-being in industrialized and developing nations continues to be influenced by disparate components and there is growing evidence that climate change is a new and potentially damaging global threat. Context affects the prospect of finding solutions because socio-economic elements, ethical considerations, and moral norms all play their part. Of central concern is how to advance from the innumerable benefits of capitalism and industrialization based on economies driven by fossil fuels towards a predominantly low carbon economy faced with high population growth rates, consumerism in the North, poverty in the South, financial instability worldwide, and food insecurity. Cooperation among nations has become a pressing priority and it demands that value systems should be incorporated more strongly into international negotiations if we are to sustain a civil society that responds positively to the new politics of the global environment.

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Fattah, Abdul, and Abdul Goffar Khan. "Optimum charging scheme of Electric Vehicle (EV) battery." AIUB Journal of Science and Engineering (AJSE) 17, no. 3 (November 30, 2018): 103–9. http://dx.doi.org/10.53799/ajse.v17i3.15.

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Tubular plate lead acid deep cycle batteries are becoming more and more popular in Bangladesh to run electrical vehicles. A China made low cost charger is commonly used to charge these batteries which takes approximately 10 hours to full charge. In this paper, comparative results of charging EV tubular battery using conventional charger as well as Universal Battery Tester (UBT) have been reported. Total 8 different types of charging methods have been tested and different parameters like temperature rise, change of specific gravity of the electrolyte in the battery, variation of voltage and current, stored Ampere-Hour etc. have been observed. Thereby a comparatively quick charging method has been proposed which can ensure less temperature rise and therefore better efficiency and longer battery life.

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Mikulka, J., M. Korčáková, V. Burešová, and J. Andr. "Changes in weed species spectrum of perennial weeds on arable land, meadows and pastures." Plant Protection Science 45, Special Issue (January 3, 2010): S63—S66. http://dx.doi.org/10.17221/2805-pps.

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Occurrence of selected perennial weeds has been monitored at control sites across the Czech Republic since 1989, and trends of their occurrence have been evaluated. The monitoring has been aimed mainly at <i>Cirsium arvense</i> (L.) SCOP, <i>Sonchus arvensis</i> L., <i>Artemisia vulgaris</i> L., <i>Stachys palustris</i> L., <i>Bolboschoenus planiculmis</i>, <i>Bolboschoenus laticarpus</i>, and <i>Elytrigia repens</i> (L.) NEV. on arable land and <i>Taraxacum officinale</i> L.A. on pastures and meadows. High increase in the frequency of occurrence of <i>C. arvense</i> and <i>E. repens</i> was found out in the mid-nineties while the infestation frequency with these two weeds decreased later on. The occurrence of infestation with the other perennial weeds <i>Cirsium arvense</i>, <i>Elytrigia repens</i>, <i>Sonchus arvensis</i>, <i>Bolboschoenus planiculmis, <i>Bolboschoenus laticarpus</i>, <i>Stachys palustris</i>, <i>Artemisia vulgaris</i> and <i>Taraxacum officinale</i> L.A. slightly but continually increased.

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