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Journal articles on the topic 'Gas-dynamic characteristics of a metal hose'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Zhao, Lian Hua, Bao Ling Xie, and Li Hua Fan. "CR/EPDM Blends with Steel Friction and Wear Characteristics under Dry Sliding." Applied Mechanics and Materials 341-342 (July 2013): 291–95. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.291.

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CR is often used to make the foreskin material transport belts, wires, cables, and the manufacture of oil hose, gaskets, equipment and chemical resistant bushing. EPDM is often used to produce heat-resistant conveyor belts, cables, wires, anti-corrosion lining, gaskets, waterproof sheet, door and window seals, etc. The same hardness and different proportions of CR/EPDM blends with steel under dry friction pair as the research object to seek friction characteristics of different formulations of rubber with steel metal in the dynamic coordination. Friction test at a constant low load, constant t

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2

Ping, An, Jian Wang, Ruofan Xiao, Renying Liu, Yanan Chang, and Qingmin Li. "Trap Parameters Optimization Based on Metal Particle Dynamic Simulation Method." Symmetry 14, no. 6 (2022): 1187. http://dx.doi.org/10.3390/sym14061187.

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Insulation failure usually occurs in AC gas-insulated transmission (AC GIL) in field operation, in which the primary cause is the charged motion of metal particles in the electric filed. At present, the particle inhibition method applied is to design particle traps on the inner wall of the GIL shell. However, due to the large randomness of the charged motion for metallic particles and the limitations of field test methods, a particle trap has not yet been designed from the perspective of particle trapping effectiveness. In this paper, firstly, referring to the size of a running 252 kV AC GIL,

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3

Cao, Hanxue, Qiang Zhang, Weikai Zhu, et al. "Study on the Influence of Injection Velocity on the Evolution of Hole Defects in Die-Cast Aluminum Alloy." Materials 17, no. 20 (2024): 4990. http://dx.doi.org/10.3390/ma17204990.

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Aluminum alloy die casting has achieved rapid development in recent years and has been widely used in all walks of life. However, due to its high pressure and high-speed technological characteristics, avoiding hole defects has become a problem of great significance in aluminum alloy die casting production. In this paper, the filling visualization dynamic characterization experiment was innovatively developed, which can directly study and analyze the influence of different injection rates on the formation and evolution of alloy flow patterns and gas-induced defects. As the injection speed incre

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4

Саврико, А. В., С. Н. Лымич, К. В. Кружаев, В. С. Левин, and А. В. Москвичев. "INFLUENCE OF GAS-DYNAMIC TESTING RIG PIPELINES MATERIAL ON THEIR DYNAMIC CHARACTERISTICS." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 5 (November 19, 2021): 118–25. http://dx.doi.org/10.36622/vstu.2021.15.5.017.

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Приведено исследование зависимости газодинамических характеристик стенда от применяемого материала трубопровода. Oсновополагающими факторами, влияющими на работоспособность стенда, являются выходные параметры - давление и расход рабочего тела, которые напрямую зависят от потерь давления на трение, создаваемого элементами стенда. Для оценки степени влияния материалов на потери стенда выбраны два вида труб: полипропиленовые и металлические. Аналитические расчёты потери давления рассматриваемых трубопроводов из различного материала показали, что трубопроводы из полипропилена предпочтительнее. Одн

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5

Bykov, I. Yu, I. N. Birillo, and P. A. Kuzbozhev. "STUDY OF CHARACTERISTICS OF MECHANICAL PROPERTIES OF GAS-DISTRIBUTING STATION PIPES METAL AFTER LONG-TERM OPERATION." Oil and Gas Studies, no. 2 (April 30, 2015): 86–91. http://dx.doi.org/10.31660/0445-0108-2015-2-86-91.

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During operation the technological pipelines of gas-distributing station are affected by mechanical static loading resulted from internal pressure of gas in the high pressure pipelines and a dynamic loading from a high-speed stream of gas in low pressure pipelines. A comparison is made of characteristics of mechanical properties of gas-distributing station pipes metal after a long-term operation for the conditions of static and dynamic loading effects.

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Ponomarev, Alexey, Sergey Plakhov, Andrew Aksenov, and Andrey Popov. "Effect of gas-dynamic spraying parameters on the characteristics of coatings for steel shaft." MATEC Web of Conferences 329 (2020): 02012. http://dx.doi.org/10.1051/matecconf/202032902012.

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In this article, the effect of the powder composition and energy parameters of the gas-dynamic deposition mode on the hardness of coatings of low-carbon steel samples was studied. Technological recommendations for preliminary preparation of the base metal of shafts before gas-dynamic spraying of thin layers in order to increase the strength of their adhesion are proposed.

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7

Xu, Xing Xin, Xiao Hui Zhang, Chuan Shao Liu, and Bo Zhao. "Drilling Characteristics of SiC Particle Reinforced Aluminum-Matrix Composites with Ultrasonic Vibration." Key Engineering Materials 455 (December 2010): 302–6. http://dx.doi.org/10.4028/www.scientific.net/kem.455.302.

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With the rapid development of aviation at home, particle reinforced metal matrix composites (PRMMCs) has been widely applied recently. But at the same time, the difficult machining has gradually been one of the most outstanding bottle-necks that restrict the rapid enhancement of productivity. Here, in virtue of the self-developed ultrasonic drilling equipment, hole-making experiments of common and ultrasonic vibration drilling are performed on SiC particle reinforced aluminum-matrix composites （SiCp/Al）with different content of SiC by using two types of tungsten carbide drill. Drilling charact

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8

Amaechi, Chiemela Victor, Facheng Wang, and Jianqiao Ye. "Investigation on Hydrodynamic Characteristics, Wave–Current Interaction and Sensitivity Analysis of Submarine Hoses Attached to a CALM Buoy." Journal of Marine Science and Engineering 10, no. 1 (2022): 120. http://dx.doi.org/10.3390/jmse10010120.

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There is an increase in the utilization of the floating offshore structure (FOS) called Catenary Anchor Leg Mooring (CALM) buoys and the attached marine hoses due to the increasing demand for oil and gas products. These hoses are flexible and easier to use but have a short service life of about 25 years. They are adaptable in ocean locations of shallow, intermediate and deep waters. In this research, a numerical model was developed using a coupling method modeled by utilizing ANSYS AQWA and Orcaflex (Orcina Ltd., Ulverston, UK) dynamic models of the CALM buoy hoses. Two cases were comparativel

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9

Han, Tae-Hee, So-Young Bak, Sangwoo Kim, Se Hyeong Lee, Ye-Ji Han, and Moonsuk Yi. "Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics." Sensors 21, no. 6 (2021): 2103. http://dx.doi.org/10.3390/s21062103.

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This paper introduces a method for improving the sensitivity to NO2 gas of a p-type metal oxide semiconductor gas sensor. The gas sensor was fabricated using CuO nanowires (NWs) grown through thermal oxidation and decorated with ZnO nanoparticles (NPs) using a sol-gel method. The CuO gas sensor with a ZnO heterojunction exhibited better sensitivity to NO2 gas than the pristine CuO gas sensor. The heterojunction in CuO/ZnO gas sensors caused a decrease in the width of the hole accumulation layer (HAL) and an increase in the initial resistance. The possibility to influence the width of the HAL h

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10

Camporeale, S. M., B. Fortunato, and A. Dumas. "Dynamic modelling of recuperative gas turbines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 214, no. 3 (2000): 213–25. http://dx.doi.org/10.1243/0957650001538317.

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This paper describes the mathematical model and the computational procedure adopted for the development of a modularly structured computer code able to simulate the dynamic behaviour of recuperative gas turbine power plants. For accurate simulation of the turbine components, the model includes a stage-by-stage procedure for the air-cooled turbine based on the blade geometry and the characteristics of the cooling system. The counter-flow surface heat exchanger, assumed as recuperator, is described by a set of partial differential equations, giving à One-dimensional description of the temperatur

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11

Kozenkova, G. L., V. N. Talamanov, V. A. Kozenkov, S. I. Kondratyev, E. V. Khekert, and M. A. Modina. "Study of pneumatic sources of elastic waves for marine seismic exploration." Journal of Physics: Conference Series 2061, no. 1 (2021): 012068. http://dx.doi.org/10.1088/1742-6596/2061/1/012068.

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Abstract An extensive use of geophysical methods necessitates the development of new methods and improvement of existing methods for seismic exploration to provide reliable data on the structure of the environment in difficult geological conditions. Therefore, it is especially relevant to solve the problems arising in marine petroleum geophysics, which require constant improvement of the methodology and technology of work, and the development and implementation of the advanced seismic equipment. Pneumatic sources that use compressed air as a working medium are among the most effective non-expl

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12

KUCHERENKO, Jylia. "SUBSTANTIATION OF THE CHOICE OF COATING MATERIAL WHEN RESTORING PARTS OF AGRICULTURAL MACHINERY BY COLD GAS-DYNAMIC SPRAYING." Herald of Khmelnytskyi National University. Technical sciences 317, no. 1 (2023): 119–22. http://dx.doi.org/10.31891/2307-5732-2023-317-1-119-122.

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Based on the method of cold gas-dynamic spraying, technologies are being created to solve problems of energy and resource saving in various industries and non-traditional and effective methods of production, repair, restoration, anti-corrosion protection, obtaining electrical and heat-conductive, anti-friction and other coatings of functional units, and as well as elements of a wide variety of machinery and equipment. The main feature of cold gas-dynamic spraying is the absence of high temperatures during the formation of metal coatings, therefore, the absence of oxidation of particle and base

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13

Wen, Wei-Chih, Ting-I. Chou, and Kea-Tiong Tang. "A Gas Mixture Prediction Model Based on the Dynamic Response of a Metal-Oxide Sensor." Micromachines 10, no. 9 (2019): 598. http://dx.doi.org/10.3390/mi10090598.

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Metal-oxide (MOX) gas sensors are widely used for gas concentration estimation and gas identification due to their low cost, high sensitivity, and stability. However, MOX sensors have low selectivity to different gases, which leads to the problem of classification for mixtures and pure gases. In this study, a square wave was applied as the heater waveform to generate a dynamic response on the sensor. The information of the dynamic response, which includes different characteristics for different gases due to temperature changes, enhanced the selectivity of the MOX sensor. Moreover, a polynomial

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14

Rusanov, Roman, Andrii Rusanov, Viktor Shvetsov, Marina Chugay, and Sergii Tretiak. "INFLUENCE OF THE OPERATING AND GEOMETRIC CHARACTERISTICS ON THE EFFICIENCY OF A POWERFUL STEAM TURBINE HPC FLOW PART." System Research in Energy 2025, no. 2 (2025): 29–39. https://doi.org/10.15407/srenergy2025.02.029.

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The results of a research of the various operating and geometric parameters influence on the efficiency of the high-power steam turbine high-pressure cylinder flow part for nuclear power plants is presented in the paper. The purpose of the research is to determine the rational characteristics of the high-pressure cylinder flow part to ensure its high gas-dynamic efficiency. Seven options of a high-pressure cylinder with different numbers of stages, designed for the characteristics of the promising AP1000 nuclear reactor, were considered. The research was caried out using modern methods of gas-

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15

Nuguzhinov, Zmagul, Daniyar Tokanov, Ashat Rakhimov, and Almas Nurzhigit. "Main problems in the operation of metal gas discharge pipes." Technobius 3, no. 3 (2023): 0045. http://dx.doi.org/10.54355/tbus/3.3.2023.0045.

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This paper delves into the scientific and technical examination of the load-bearing structures within the "Kazak Eli" complex in Astana, specifically addressing the issue of excessive vertical oscillations in relation to its primary horizontal displacements. The collaborative efforts of KazMIRR Institute (Research, Expert and Design and Survey Kazakhstan Multidisciplinary Institute of Reconstruction and Development), in conjunction with the Central Research and Design Institute of Building Metal Structures named after Melnikov, and with the participation of the TsAGI Institute (Central Aerohyd

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16

Chen, Bin, Ge Liu, Xian Ming Zhang, and Lang Huang. "Analysis Coupling Vibration Characteristic of HVAS Droplets Based on Wave-Like Disturbance." Applied Mechanics and Materials 71-78 (July 2011): 5068–73. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.5068.

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Characteristics of vibration molten metal droplets are decisive importance to performance of high velocity arc sprayed coating, it is hardly that detected the dynamic action of liquid droplets owing to the limitation of experimental technique. The gas fluid-liquid droplet coupling vibration system of equations were established based on wave-like disturbance, the governing equation for fastest-growing wave number is derived. The agreement of predicted fastest-growing wave number and data of Bradley, which has the deviation within the±2% limits,indicares that the gas fluid-liquid droplet couplin

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17

Latifah Husni, Nyayu, Ade Silvia, Siti Nurmaini, and Irsyadi Yani. "Metal Oxides Semiconductor Sensors for Odor Classification." International Journal of Reconfigurable and Embedded Systems (IJRES) 6, no. 3 (2017): 133. http://dx.doi.org/10.11591/ijres.v6.i3.pp133-149.

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<span>The performance of gas sensor will differ and vary due to the surrounding environment changing, the way of implementation, and the position of the sensors to the source. To reach a good result on gas sensors implementation, a performance test on sensors is needed. The results of the tests are useful for characterizing the properties of the particular material or device. This paper discusses the performances of metal oxides semiconductor (MOS) sensors. The sensors are tested to determine the sensors' time response, sensors' peak duration, sensors' sensitivity, and sensors' stability

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18

Strelnik, A. S., S. V. Dvoinishnikov, V. G. Meledin, et al. "Developing the software and hardware complex to diagnose the ascent of gas bubbles in a liquid metal by the Doppler anemometry method." Journal of Physics: Conference Series 2057, no. 1 (2021): 012093. http://dx.doi.org/10.1088/1742-6596/2057/1/012093.

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Abstract The complex method of ultrasonic diagnostics of two-phase flows in a liquid metal medium is developed. It allows measuring the dynamic and structural characteristics of the floating inhomogeneity. A software and hardware complex that implements the proposed method is developed and tested for ultrasonic diagnostics of two-phase flows in water and liquid metal medium.

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19

Valsalal, P., S. Usa, and K. Udayakumar. "Response of metal oxide arrester in gas-insulated substation and methods to improve its dynamic characteristics." IET Science, Measurement & Technology 6, no. 4 (2012): 222. http://dx.doi.org/10.1049/iet-smt.2011.0051.

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20

Tovstonog, V. A. "Comparative Assessment of Thermal Protective Characteristics of Metal and Ceramic Shields of Flow Paths of High-Temperature Gas Dynamic Facilities." Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, no. 2 (131) (April 2020): 52–75. http://dx.doi.org/10.18698/0236-3941-2020-2-52-75.

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In modern technology, gas dynamic facilities with a flow path of a high-temperature working fluid are widely used. Their effectiveness largely depends on the maximum achievable temperature, which is to a great extent determined by the heat resistance of structural materials and thermal protection systems of the most heat-stressed structural units. Most often, mass transfer thermal protection methods using the coolant of fuel components are used in such plants. However, in some gas dynamic facilities, such as high-speed ramjet engines, the use of such methods is only sufficient to maintain an a

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21

Taratyn, I. A., O. G. Reutskaya, G. G. Gorokh, I. V. Serdyuk, and V. S. Fedosenko. "Gas-Sensitive Characteristics of Low-Power Semiconductor Gas Sensors to CO and H<sub>2</sub>." Devices and Methods of Measurements 15, no. 1 (2024): 18–29. http://dx.doi.org/10.21122/2220-9506-2024-15-1-18-29.

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Strict requirements for determining of gases concentration in the working environment it is relevant to develop of semiconductor sensors which provide rapid response and safety of personnel in industrial and domestic premises. The aim of the work was to study gas-sensitive and dynamic characteristics of high-sensitive low-power sensors made on thin nanoporous substrates with gas-sensitive layers of semiconductor metal oxides. The low-power semiconductor gas sensor on the anodic alumina substrate has been developed. Sensors with gas-sensitive semiconductor metal oxide layers based on In2O3+Ga2O

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22

Cai, Dong, Lin, Murphy, Fan, and Yang. "Heat Source Characteristics of Ternary-Gas-Shielded Tandem Narrow-Gap GMAW." Materials 12, no. 9 (2019): 1397. http://dx.doi.org/10.3390/ma12091397.

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: The characteristics of the welding heat source for tandem narrow-gap gas metal arc welding are examined for different ternary shielding gas (Ar-CO2-He) compositions. Results of previous calculations of arc properties for bead-on-plate geometry are adapted to the narrow-gap geometry to predict these characteristics. The heat source concentration factor decreases and the maximum heat flux density increases as the helium content increases, which leads to an increased welding heat efficiency. Addition of CO2 up to around 10% also increases the heat efficiency. When the CO2 content exceeds 10%, t

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23

N. Lenin Rakesh, K. Selvakumar, and V. Mohanavel. "Influences of hybrid fiber on functional and drilling characteristics study of polymer hybrid Nanocomposite." Journal of Environmental Nanotechnology 13, no. 3 (2024): 253–61. http://dx.doi.org/10.13074/jent.2024.09.243869.

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The severe environmental pollution related to the manufacturing, recycling and disposal of metal-based and synthetic fiber-based composites has a major impact on human and animal life. A wide range of studies are conducted on alternative materials in order to reduce greenhouse gas emissions. Various industries are focusing on using natural fibers from banana, jute, coir, hemp, pineapple, areca, kenaf, Sterculia foetida and Delonix regia that are the key sources of different components for developing nanocomposites. Drilling is a vital factor in the assembly process of composites. The amorphous

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24

Sharma, N. Yagnesh, Chandrakanth Kini, Deepak D, and Pratik Shamrao Joshi. "A Computational Fluid Dynamic Study on Transient Thermal Characteristics of Two-Phase Gas Metal Arc Welding Process." International Journal of Recent advances in Mechanical Engineering 3, no. 2 (2014): 27–34. http://dx.doi.org/10.14810/ijmech.2014.3203.

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25

Xu, Yang, Xingbing Xie, Lei Zhou, Biao Xi, and Liangjun Yan. "Noise Characteristics and Denoising Methods of Long-Offset Transient Electromagnetic Method." Minerals 13, no. 8 (2023): 1084. http://dx.doi.org/10.3390/min13081084.

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The advantages of the long-offset transient electromagnetic method include deep detection and sensitive response to resistivity anomalies. It is widely used in underground mineral resources exploration, fluid identification in petroleum reservoirs, hydraulic fracturing, and dynamic residual oil and gas monitoring. After the primary field signal is turned off, grounded electrodes or coils are used to observe the secondary eddy field. The secondary field signal decays quickly and has a large dynamic range and a wide frequency band but is easily affected by various natural and human electromagnet

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26

Matviychuk, Viktor, and Oleg Gaidamak. "INCREASING OF THE DURABILITY OF DETAILS WORKING UNDER REPEATABLE- LOADS." Vibrations in engineering and technology, no. 1(96) (August 27, 2020): 5–14. http://dx.doi.org/10.37128/2306-8744-2020-1-1.

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The article develops processes of increase the durability of parts operating under repeated loads, by justifying the parameters of surface plastic deformation (SPD) and cold gas-dynamic coating. The influence on the depth of the reinforced surface layer, the nature of the distribution of the stress-strain state of the material and residual compressive stresses, as well as the value of the used plasticity of the metal, the parameters of the SPD process. The hypothesis is substantiated that the main factor in the formation of residual compressive stresses during SPD is the decrease in metal dens

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27

Zarko, Vladimir, and Anatoly Glazunov. "Review of Experimental Methods for Measuring the Ignition and Combustion Characteristics of Metal Nanoparticles." Nanomaterials 10, no. 10 (2020): 2008. http://dx.doi.org/10.3390/nano10102008.

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Investigations in recent decades have shown that the combustion mechanism of metal particles changes dramatically with diminishing size. Consequently, theoretical description of the ignition and combustion of metal nanoparticles requires additional research. At the same time, to substantiate theoretical models, it is necessary to obtain objective experimental information about characteristics of ignition and combustion processes, which is associated with solving serious technical problems. The presented review analyzes specific features of existing experimental methods implied for studying ign

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28

Wieckowski, Andrzej, and Matthew Neurock. "Contrast and Synergy between Electrocatalysis and Heterogeneous Catalysis." Advances in Physical Chemistry 2011 (November 24, 2011): 1–18. http://dx.doi.org/10.1155/2011/907129.

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The advances in spectroscopy and theory that have occurred over the past two decades begin to provide detailed in situ resolution of the molecular transformations that occur at both gas/metal as well as aqueous/metal interfaces. These advances begin to allow for a more direct comparison of heterogeneous catalysis and electrocatalysis. Such comparisons become important, as many of the current energy conversion strategies involve catalytic and electrocatalytic processes that occur at fluid/solid interfaces and display very similar characteristics. Herein, we compare and contrast a few different

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29

Harb, Alaa Abu, Ion Ciuca, Robert Ciocoiu, et al. "Effect of TIG Welding and Manual Metal Arc Welding on Mechanical Properties of AISI 304 and 316L Austenitic Stainless Steel Sheets." Key Engineering Materials 750 (August 2017): 26–33. http://dx.doi.org/10.4028/www.scientific.net/kem.750.26.

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The welding technique used for ASIS 304 and 316L austenitic stainless steel sheets both with a thickness of 3mm is gas tungsten arc welding (TIG) and manual metal arc welding (MMAW). Mechanical properties that were verified include: hardness test and tensile test before welding and after it. The welding process was done on two types of specimens: with a central hole and without hole. We concluded that there was a decrease in the properties of tensile for both specimens with central hole, and 316L had tensile characteristics better than 304 when using the technique TIG. As for 304, it had tensi

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TSIPILEV, V. P., V. I. OLESHKO, A. N. YAKOVLEV, E. V. FORAT, and T. V. GRECHKINA. "EFFECT OF LASER RADIATION WAVELENGTH ON THE THRESHOLDS OF INITIATION OF ENERGY MATERIALS." Izvestiya vysshikh uchebnykh zavedenii. Fizika 67, no. 2 (2024): 14–24. https://doi.org/10.17223/00213411/67/2/2.

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The energy thresholds of initiation and kinetic characteristics of the explosive decomposition process of heavy metal azides (НМА), pentaerythrite tetranitrate (PETN), and furazanotetrazindioxide (FTDO) were measured at various wavelengths and the impacting pulse durations of ~ 10-20 ns. It is established that the behavior of energy materials changes significantly when initiated under the open and closed surface conditions, which is associated with the peculiarities of the gas-dynamic unloading of thermal microfoci.

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Kodnyanko, V. A. "Modeling Movement of Gas-Static Bearings." Mechanical Engineering and Computer Science, no. 1 (March 1, 2019): 13–28. http://dx.doi.org/10.24108/0119.0001450.

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The competitiveness of gas-static sliding bearings, which are assemblies of cutting-edge machines, in particular, precision metal-cutting machines, largely depends on their creation rapidity, which is determined by their mobility of modeling and quality of theoretical study for the later use in designing constructions. The objective is to develop a computer-aided mobile modeling technology for designing the gas-static bearings, which enables quick calculation and study of their static characteristics, quality criteria for their dynamics, and drawing-up recommendations for rapid designing of be

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Amoah, Papa K., Helmut Baumgart, and Yaw Obeng. "Characterization of Noble and Transition Metal Doped-ZnO Sensing of VOC Analytes Using Broadband Dielectric Spectroscopy." ECS Meeting Abstracts MA2022-02, no. 61 (2022): 2274. http://dx.doi.org/10.1149/ma2022-02612274mtgabs.

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Metal-oxide (MO) semiconductor-based gas sensors such as SnO2 and ZnO, have traditionally been the common materials of choice to be used for gas detection based on the mechanism of chemosensitivity. They are some of the most economic and efficient gas sensing materials, and they show a relatively quick response to several volatile organic compounds (VOCs). Doping of the MO nano surface lattices with noble and transition metals has been shown to further enhance their gas-sensing performance by improving the catalytic properties of the MO, ameliorating their response kinetics and selectivity tow

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GUAN, LEDING, BIAO YAN, LING LONG, and SHA YANG. "PRELIMINARY STUDY OF FABRICATING BULK FE-BASED AMORPHOUS ALLOY BY COLD GAS DYNAMIC SPRAYING." International Journal of Modern Physics B 23, no. 06n07 (2009): 1288–93. http://dx.doi.org/10.1142/s021797920906083x.

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Cold gas dynamic spraying (CGDS) technique makes use of high-speed gas current to spray diversified metal, alloy and composite materials under room temperature or with a little heated. It is one kind of novel surface engineering technologies, aimed at eliminating such negative influences as oxidation, gasification, melt, crystallization and gas decomposition and so on existing in hot spraying technologies. Due to its peculiar characteristics such as low spraying temperature, non-oxidation, low stress among coating layers, compactification, and high utilization rate of raw materials, as well as

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Bingül, Z. "Instability phenomena in the gas—metal arc welding self-regulation process." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 216, no. 6 (2002): 899–910. http://dx.doi.org/10.1243/095440502320192897.

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Arc instability is a very important determinant of weld quality. The instability behaviour of the gas-metal arc welding (GMAW) process is characterized by strong oscillations in arc length and current. This phenomenon was reported by Halmoy [1] for the short electrode extension and by Lebedev [2] for the long electrode extension, particularly as related to the arc voltage-current characteristics and the thermal inertia of the electrode wire respectively. However, with these studies, a complete theoretical explanation of the instability phenomena is lacking since the process is not modelled dyn

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35

Yazzie, Sheldwin A., Scott Davis, Noah Seixas, and Michael G. Yost. "Assessing the Impact of Housing Features and Environmental Factors on Home Indoor Radon Concentration Levels on the Navajo Nation." International Journal of Environmental Research and Public Health 17, no. 8 (2020): 2813. http://dx.doi.org/10.3390/ijerph17082813.

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Uranium is naturally found in the environment as a radioactive metal element with high concentrations in the Southwestern US. In this region is the Navajo Nation, which spans approximately 69,930 square kilometers. A decay product of uranium is radon gas, a lung carcinogen that has no color, odor, or taste. Radon gas may pass from soil into homes; and, indoor accumulation has been associated with geographical location, seasonality, home construction materials, and home ventilation. A home and indoor radon survey was conducted from November 2014 through May 2015, with volunteers who reported re

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Wang, Shenghui, Huaqi Liu, Kang Ma, Qi Ou, Hui Geng, and Fangcheng Lv. "Effect of Particle Trap on Motion Characteristics of Metal Particles in AC GILs and Parameter Optimization." Coatings 12, no. 7 (2022): 981. http://dx.doi.org/10.3390/coatings12070981.

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Metal particle contamination is an important reason for insulation failure of gas-insulated transmission lines (GILs). Particle trap is the common method for particle suppression. At present, research on the motion characteristics of metal particles near a particle trap and the optimization of trap parameters under AC voltage is insufficient. Based on that, firstly, a dynamic model of metal particles under AC voltage was established, and the motion characteristics of particles in front of the trap were studied, combined with experiments. Then, the influence of trap parameters on the capture ef

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Li, Guang Fu, Guan Jun Li, Jun Peng, Mao Long Zhang, and Zhi Yuan Sun. "Mechanical Behavior of a Dissimilar Metal Weld Used for Nuclear Power Plants." Applied Mechanics and Materials 675-677 (October 2014): 47–51. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.47.

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The mechanical behaviors of dissimilar metal weld SA508-52M-316L in several environments were investigated by using tensile tests with smooth specimens, focusing on the behavior of SA508-52M weld part during slow strain rates testing (SSRT) at 290°C in nitrogen gas and in simulated primary water at different electrode potentials. The mechanical properties at room temperature of main materials were obtained first. When tested at 290°C, the weld exhibited characteristics of dynamic strain ageing (DSA), which was more significant when strain rate was decreased from 1x10-6(1/s) to 3.1 x10-7(1/s).

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Qi, Bing, Hui Wang, Chang Liu, et al. "Numerical Simulation of Streaming Discharge Characteristics of Free Metal Particles in SF6/CF4 Gas Mixtures Under Highly Heterogeneous Electric Field." Sensors 25, no. 13 (2025): 3847. https://doi.org/10.3390/s25133847.

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Compared to pure SF6 gas, the SF6/CF4 gas mixture exhibits certain advantages in reducing greenhouse effects, lowering the liquefaction temperature, and decreasing the sensitivity to non-uniform electric fields, demonstrating significant application potential in high-voltage electrical equipment. This study employs a two-dimensional plasma fluid model to investigate the partial discharge phenomena induced by free metallic particles in SF6/CF4 gas mixtures, analyzing the spatiotemporal evolution characteristics of key parameters, such as the charged particle density and axial electric field, un

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Love, Calvin, Haleh Nazemi, Eman El-Masri, Kenson Ambrose, Michael S. Freund, and Arezoo Emadi. "A Review on Advanced Sensing Materials for Agricultural Gas Sensors." Sensors 21, no. 10 (2021): 3423. http://dx.doi.org/10.3390/s21103423.

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This work is a comprehensive review of sensing materials, which interact with several target gases pertinent to agricultural monitoring applications. Sensing materials which interact with carbon dioxide, water vapor (relative humidity), hydrogen sulfide, ethylene and ethanol are the focus of this work. Performance characteristics such as dynamic range, recovery time, operating temperature, long-term stability and method of deposition are discussed to determine the commercial viability of the sensing materials considered in this work. In addition to the sensing materials, deposition methods are

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Bagraev, Nikolai T., L. E. Klyachkin, A. M. Malyarenko, A. S. Shcheulin, and Alexandr I. Ryskin. "p⁺-CdB₂ - n-CdF₂ and p⁺-Si - p-CdB₂ - n-CdF₂ Diffusion Heterostructures." Defect and Diffusion Forum 237-240 (April 2005): 1060–65. http://dx.doi.org/10.4028/www.scientific.net/ddf.237-240.1060.

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The ionic semiconductor CdF2 that is of extraordinary interest for the modern optics and optoelectronics because of the largest band-gap value, 7.8 eV, from all wide-gap semiconductors and of the n-type conductivity caused by doping with the III group elements and subsequent thermal colouring is used to prepare the ultra-shallow p+- n junctions and p+-Si - n-CdF2 heterostructures by the short-time diffusion of boron from the gas phase. The forward branches of the I-V characteristics of the quantum-size p+-n junctions and heterostructures are shown to reveal not only the CdF2 gap value, but als

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Li, Wen-Yi. "Experimental Research on the Sensitivity of Partial Discharge Ultra High Frequency Sensor Structure Parameters." Journal of Nanoelectronics and Optoelectronics 16, no. 6 (2021): 911–18. http://dx.doi.org/10.1166/jno.2021.3034.

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With the development of intelligent high voltage switch, online gas insulated switchgear discharge detection technology has been more and more widely applied. Because of the high sensing sensitivity and good antiinterference performance of build-in partial discharge sensor, it is currently required to install them on gas insulated switchgear products with voltage levels of 220 kV and above at the factory. The structural parameters of the build-in partial discharge sensor is of great importance to its sensing sensitivity. Therefore, in this paper, the influence of the structure change on the se

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Zhou, Li Shan. "A Research on Detection and Identification of Harmful Gas Utilizing Cataluminescence-Based Sensor Array." Applied Mechanics and Materials 288 (February 2013): 109–13. http://dx.doi.org/10.4028/www.scientific.net/amm.288.109.

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A novel cataluminescence(CTL)-based sensor array consisting of 9 types of catalytic nanomaterials was developed for the determination and identification of harmful gas. The sensing nanomaterials, including nano-sized metal oxides, carbonates and decorated nanoparticles, have been selected carefully. A 3 x 3 array was integrated by depositing these nanosized catalysts onto the ceramic chip. Dynamic and static analysis methods were utilized to characterize the performance of the sensor array to 4 kinds of harmful gas. Each compound gives its unique CTL pattern after interact with the sensor arra

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Crichton, John H. M. "Falls in Scottish homicide: Lessons for homicide reduction in mental health patients." BJPsych Bulletin 41, no. 4 (2017): 185–86. http://dx.doi.org/10.1192/pb.bp.116.054924.

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SummaryThe sustained fall in Scottish homicide rates follows crime reduction measures informed by the epidemiology of suicide. The violence reduction unit targeted young men carrying knives in public. The restriction of weapons immediately to hand appears to have caused an absolute fall in homicide just as suicide reduction was observed following changes to domestic gas supply. Further homicide reduction may be accomplished in the domestic setting with targeted changes in kitchen knife design in home safety planning for high-risk households. Most commonly homicides involving those in recent co

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Kumar, Ashutosh, Shailendra Rajput, and Sabyasachi Parida. "Structural and Optical Characteristic of Fe¹⁰⁺ Ion Implanted Nanostructured WO₃ Film for Gas Sensing Application." ECS Journal of Solid State Science and Technology 13, no. 11 (2024): 117005. http://dx.doi.org/10.1149/2162-8777/ad9350.

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300 keV Fe10+ ions with fluences of 1×1015, 3 × 1016, and 1 × 1017 ions cm−2 were used to implant W O 3 films, developed by thermal evaporation method. After implantation, all samples were characterized for structural, morphological and optical study for gas sensing application. Furthermore, a thorough investigation and discussion of the gas sensing characteristics of pristine and Fe ion implanted W O 3 gas sensors was conducted. Dynamic gas-sensing performance were tested at room temperature for C H 4 gas at various concentrations of 50 ml min−1, 100 ml min−1, and 150 ml min−1. Sensitivity of

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Feng, Hao, Qungui Du, Yuxian Huang, and Yongbin Chi. "Modeling Study on Stiffness Characteristics of Hydraulic Cylinder under Multi-Factors." Strojniški vestnik - Journal of Mechanical Engineering 63, no. 7-8 (2017): 447. http://dx.doi.org/10.5545/sv-jme.2017.4313.

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For a complex mechanical system driven by hydraulic cylinders, the dynamic response characteristics of the mechanical system are significantly affected by the stiffness characteristics of hydraulic cylinders. This paper comprehensively studies the impacts of various factors on the stiffness characteristics of the hydraulic cylinders, including the oil bulk modulus, the air content in the hydraulic oil, the axial deformation of the piston rod, the volume expansion of the cylinder barrel, the volume expansion of the metal pipes and the flexible hoses, and the deformation of the hydraulic cylinde

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Zhang, Xueqing, Xiaojing Li, and Tianzhe Shi. "Molecular Dynamics Simulation on the Deposition Characteristics between Pt Cluster and Ni Substrate in Cold Gas Dynamic Spraying." Coatings 12, no. 2 (2022): 142. http://dx.doi.org/10.3390/coatings12020142.

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During the process of cold spraying, the motion behavior and the arrangement of clusters, before impacting the substrate, have great influences on the coating/substrate bonding strength and the coating morphologies. In this work, the scattering and self-rotating movement of a single cluster and the different spatial positions of two clusters were taken into account to analyze the deposition characteristics between Pt clusters and Ni substrate by using the molecular dynamics method. We found that an excessively high normal velocity results in the failure of mechanical interlocking. Meanwhile, t

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Spirin, Nikolay, Oleg Onorin, and Alexander Istomin. "Prediction of Blast Furnace Thermal State in Real-Time Operation." Solid State Phenomena 299 (January 2020): 518–23. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.518.

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The paper gives a general description of the dynamic model of the blast-furnace process that enables to calculate transition processes of the blast furnace thermal state, evaluated by the content of silicon in hot metal. It provides calculation results of the transition processes to be subjected to changes in control actions: ore load from the top and oxygen concentration in blast, natural gas flow rate and hot blast temperature from the bottom. Specific features of these transition processes during blast-furnace smelting are analyzed. The paper shows that the dynamic characteristics of blast

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ZOU, SHUANGYANG, ZHIJIANG WANG, SHENG-SUN HU, GUANCHENG ZHAO, WANDONG WANG, and YOUQUAN CHEN. "Effects of Filler Wire Intervention on Gas Tungsten Arc: Part I - Mechanism." Welding Journal 99, no. 9 (2020): 246s—254s. http://dx.doi.org/10.29391/2020.99.023.

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For gas tungsten arc welding (GTAW), the effects of filler wire on the GTA are worth being clarified, which will help deepen the understanding of arc characteristics and in-spire new ideas for the real-time monitoring of weld quality. To this end, this work proposed a novel sensing method of detecting probe voltages (i.e., the voltage signals between a filler wire and tungsten electrode/workpiece). Based on this method, in this first part of the work, a tungsten probe was used to replace the filler wire and to interact with the arc in the specific experiments to elucidate the static and dynami

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Xue, Yingying, Shimeng Mou, Changming Chen, et al. "A Novel Electronic Nose Using Biomimetic Spiking Neural Network for Mixed Gas Recognition." Chemosensors 12, no. 7 (2024): 139. http://dx.doi.org/10.3390/chemosensors12070139.

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Odors existing in natural environment are typically mixtures of a large variety of chemical compounds in specific proportions. It is a challenging task for an electronic nose to recognize the gas mixtures. Most current research is based on the overall response of sensors and uses relatively simple datasets, which cannot be used for complex mixtures or rapid monitoring scenarios. In this study, a novel electronic nose (E-nose) using a spiking neural network (SNN) model was proposed for the detection and recognition of gas mixtures. The electronic nose integrates six commercial metal oxide senso

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Zhabanov, Yuriy A., Alexey V. Eroshin, Igor V. Ryzhov, Ilya A. Kuzmin, Daniil N. Finogenov, and Pavel A. Stuzhin. "Molecular Structure, Thermodynamic and Spectral Characteristics of Metal-Free and Nickel Complex of Tetrakis(1,2,5-thiadiazolo)porphyrazine." Molecules 26, no. 10 (2021): 2945. http://dx.doi.org/10.3390/molecules26102945.

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The Knudsen effusion method with mass spectrometric control of the vapor composition was used to study the possibility of a congruent transition to the gas phase and to estimate the enthalpy of sublimation of metal-free tetrakis(1,2,5-thiadiazolo)porphyrazine and its nickel complex (H2TTDPz and NiTTDPz, respectively). The geometrical and electronic structure of H2TTDPz and NiTTDPz in ground and low-lying excited electronic states were determined by DFT calculations. The electronic structure of NiTTDPz was studied by the complete active space (CASSCF) method, following accounting dynamic correl

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