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Relevant bibliographies by topics / COP rotational component

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Academic literature on the topic 'COP rotational component'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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Journal articles on the topic "COP rotational component"

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Zhi, Ruiping, Rui Ma, Delou Zhang, and Yuting Wu. "Experimental Research on a Lightweight Miniature Wankel Compressor for a Vapor Compression Refrigeration System in Aerospace." Sustainability 15, no. 11 (2023): 8826. http://dx.doi.org/10.3390/su15118826.

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Vapor compression refrigeration is considered one promising technology for dissipating much higher heat fluxes from electronic devices at lower temperatures. The compressor, one key component, has a great effect on the overall size and performance of the system. One lightweight, miniature, hermetic Wankel compressor was developed to solve limited space cooling problems. The assembled Wankel compressor had a diameter of 65 mm, a length of 85 mm and a weight of 340.2 g, without a motor and housing. An experimental system for miniature refrigeration was set up to explore the optimal refrigerant c

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Cau, Costantino, Alessandro Taras, Gabriele Masia, et al. "Structural Evolution of Olivine during Mechanochemically Assisted Mineral Carbonation under CO2 Flow." Inorganics 12, no. 10 (2024): 269. http://dx.doi.org/10.3390/inorganics12100269.

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The mechanism of the mechanically assisted mineral carbonation of commercial olivine under the flow of a carbon dioxide (CO2)/nitrogen (N2) mixture has been elucidated by ex situ powder X-ray diffraction and Fourier-transform infrared spectroscopy. The overall CO2 conversion depends on the rotational frequency of the mill’s engine, and it reaches 85% within 90 min of mechanical treatment at a flow rate of 2.5 L min−1. By tuning the frequency of rotation, the kinetics of CO2 conversion unveil a complex reaction pathway involving subsequent steps. Structural analyses suggest that clinochlore, a

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Volkov, I. M., A. S. Volkova, and L. A. Bagaev. "V839 Cep – a new quadruple doubly eclipsing system." Astronomičeskij žurnal 101, no. 9 (2024): 819–38. https://doi.org/10.31857/s0004629924090034.

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New high-precision photometric measurements of the eclipsing star V839 Cep (P = 9.96d, VA+B = 9.64m, e = 0.07, B6 V + B7 V), which is the “A” component of the visual double star J21035+5925AB, have established that component “B” is also an eclipsing variable (P = 4.075d, B9 V + G8 V). For component “A”, the apsidal rotation rate was measured to be ω˙obs=0.027°/year, which exceeds the theoretical value under the condition of synchronism ω˙theor=0.021°/year. The physical parameters of the component stars of the eclipsing pair “A” were obtained: T1 = 13 200 ± 300 K, M1 = (3.7 ± 0.15) M⊙, R1 = (2.

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Ospina-Zamudio, J., B. Lefloch, C. Ceccarelli, et al. "First hot corino detected around an isolated intermediate-mass protostar: Cep E-mm." Astronomy & Astrophysics 618 (October 2018): A145. http://dx.doi.org/10.1051/0004-6361/201832857.

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Context. Intermediate-mass (IM) protostars provide a bridge between the low- and high-mass protostars. Despite their relevance, little is known about their chemical diversity. Aims. We want to investigate the molecular richness towards the envelope of I-M protostars and to compare their properties with those of low- and high-mass sources. Methods. We have selected the isolated IM Class 0 protostar Cep E-mm to carry out an unbiased molecular survey with the IRAM 30 m telescope between 72 and 350 GHz with an angular resolution lying in the range 7–34″. Our goal is to obtain a census of the chemi

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Sergison, Darryl J., Tim Naylor, S. P. Littlefair, Cameron P. M. Bell, and C. D. H. Williams. "Characterizing the i-band variability of YSOs over six orders of magnitude in time-scale." Monthly Notices of the Royal Astronomical Society 491, no. 4 (2019): 5035–55. http://dx.doi.org/10.1093/mnras/stz3398.

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ABSTRACT We present an i-band photometric study of over 800 young stellar objects in the OB association Cep OB3b, which samples time-scales from one minute to 10 yr. Using structure functions we show that on all time-scales (τ) there is a monotonic decrease in variability from Class I to Class II through the transition disc (TD) systems to Class III, i.e. the more evolved systems are less variable. The Class Is show an approximately power-law increase (τ0.8) in variability from time-scales of a few minutes to 10 yr. The Class II, TDs, and Class III systems show a qualitatively different behavi

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Muhammad Arman, Kasni Sumeru, Andriyanto Setyawan, Luga Martin Simbolon, and Mohamad Firdaus Sukri. "Energy and Exergy Analysis of R600a as a Substitute for R134a in Automotive Air Conditioning System." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 119, no. 1 (2024): 105–16. http://dx.doi.org/10.37934/arfmts.119.1.105116.

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Until now, R134a is still used as a working fluid in automotive air conditioning (A/C) even though it has a very high global warming potential (GWP), which is 1430. Refrigerant R600a is an alternative working fluid as a substitute for R134a in automotive (A/C). This environmentally friendly substitute refrigerant is also expected to produce a better system performance, for which it is necessary to analyse energy and exergy. During work, each AC component generates friction, heat loss, and pressure drop which causes irreversibility in each component. The irreversible quantity of each component

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Arumugasamy, Prakash, and Dipanjan Mitra. "Evaluating the evidence of multipolar surface magnetic field in PSR J0108–1431." Monthly Notices of the Royal Astronomical Society 489, no. 4 (2019): 4589–605. http://dx.doi.org/10.1093/mnras/stz2299.

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ABSTRACT PSR J0108–1431 is an old pulsar where the X-ray emission is expected to have a thermal component from the polar cap and a non-thermal component from the magnetosphere. Although the phase-integrated spectra are fit best with a single non-thermal component modelled with a power law (PL) of photon index Γ = 2.9, the X-ray pulse profiles do show the presence of phase-separated thermal and non-thermal components. The spectrum extracted from half the rotational phase away from the X-ray peak fits well with either a single blackbody (BB) or a neutron star atmosphere (NA) model, whereas the s

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NEKRASENKO, L. A. "TAX INCENTIVES TO MANAGE LAND AS A NATURAL ASSET." Economic innovations 24, no. 1(82) (2022): 122–29. http://dx.doi.org/10.31520/ei.2022.24.1(82).122-129.

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Topicality. Successful economic development of agriculture is one of the components of Ukraine's sustainable development. But this development very often leads to changes in natural and climatic conditions and to increased risks for doing business. Agricultural land is a natural asset and it should be taken into account that the change oflandscapes from natural vegetation to any other use can lead to loss, degradation, and fragmentation of the environment, all of which can have devastating consequences for biodiversity as a source of ecosystem services. Therefore, it is important to find ways

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Rizki, Muliawan, Septyansah, Khakim Nur, YP Bowo, Falahuddin F. MA, and Azmy Ilham. "THE EFFECT OF VARIATIONS SPEED OF THE CONDENSER FAN WITH CONTROL FREQUENCY INVERTER ON THE ICE SLUSH MACHINE APPLICATION." AUSTENIT 14, no. 2 (2022): 86–94. https://doi.org/10.5281/zenodo.7265888.

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<em>The condenser is one of the main components in the ice slush machine system that functions to removed heat from the system to the environment. In this system, the condenser is equipped with a fan whose rotation speed is modified using an inverter that aims to determine the system performance and condenser capacity at each fan rotation variation of the ice slush machine. There are 3 variations of frequency settings in this system 50 Hz, 40 Hz, and 30 Hz, with equivalent velocity air 3.6, 2.9, and 1.9 m/s respectively. In this study, the performance of the ice slush machine with various cond

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Asgharifard-Sharabiani, P., A. Hannaneh, and M. Nikkhah-Bahrami. "Calculation of helical gear’s basic parameters using COP-data acquired by optical 3D digitizer." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 12 (2011): 2953–62. http://dx.doi.org/10.1177/0954406211409841.

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Gears are industrial components with a precise geometry. Identification of their basic parameters plays an important role in their reverse design and quality control process. This article describes a new approach for the calculation of helical gear’s basic parameters using optical data acquired by 3D digitizer. This approach is implemented by acquiring cloud-of-points data (COP-data) from the bearing seats and gear tooth surface. Cylinder surface fitting through COP-data acquired from bearing seats is performed for the determination of gear axis of rotation. In a final step, involute helicoid

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Book chapters on the topic "COP rotational component"

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Sturm, V., L. Gronewäller, P. Loosen, and H. Schülke. "Temporal Measurement of CO2-Laser Output Resolved into Transverse Direction, Polarization Components and Rotational Transitions." In Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-48372-1_17.

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Burlaka, Serhiy, and Tetiana Yemchik. "IMPROVING THE EFFICIENCY OF THE USE OF BIODIESEL FUEL MIXTURES IN THE SYSTEMS OF AUTONOMOUS ENERGY SUPPLY OF AGRICULTURAL ENTERPRISES." In Modernization of research area: national prospects and European practices. Publishing House “Baltija Publishing”, 2022. http://dx.doi.org/10.30525/978-9934-26-221-0-9.

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The research is devoted to solving important tasks of interdisciplinary research work on the topic: «Development of scientific and technical support for energy autonomy of the agro-industrial complex based on environmentally efficient use of agrobiomass for biofuel production», state registration number 0122U000844, implementation of which is planned for 2022–2024 at the expense of the state budget of Ukraine.The use of fossil fuels leads to environmental pollution and climate change in general. To ensure energy security and to improve the environmental conditions necessary for the use of alte

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Conference papers on the topic "COP rotational component"

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Klein, Oliver, Hans Hoffmeister, and Jens Uwe Brandt. "Investigation of the Vector Velocity Field in Rotating Disc Crevices by Means of Numerical Calculation and Pressure Sensory Experimentation." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06381.

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Abstract In a previous paper a new type of laboratory test facility was introduced, that enables experimental modeling of rotating and fixed pump components respective electrochemical and mechanical wear. The effects of velocity, gap width and erosion-corrosion in a CO2 multiphase environment had been shown. This paper discusses the results of experiments conducted on the new test facility with a set of pressure sensors integrated in the flow path of the fluid in the crevice. It will be shown how the ascertained pressure sensory data can be used to calculate the radial component of the fluid v

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Mendoza-Flores, J., and S. Turgoose. "A Rotating Cylinder Electrode Study of Cathodic Kinetics and Corrosion Rates in CO2 Corrosion." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95124.

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Abstract A study has been made of the cathodic kinetics in CO2 containing solutions on the rotating cylinder electrode. It is shown that at pH &lt; 4 there is a clear limiting current over a wide range of potential. Similar to rotating disc studies, this limiting current shows flow dependent and flow independent components, as observed with the rotating disc electrode at similar pH. The rotation speed independent component can be related to the slow hydration reaction of carbon dioxide and the flow dependence is due to the diffusion of protons and carbonic acid. At pH 6 a limiting current

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Klein, Oliver, Hans Hoffmeister, Mathaeus Soppa, Robert Klatt, and Mathias Jung. "Investigation of the Erosion Corrosion Resistance of a Chromium Nickel Steel in a CO2 Multiphase Environment at Different Temperatures and with Varying Degrees of Sand Loads." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06370.

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Abstract The increasing use of multiphase pump systems in the oil and gas industry has drawn attention to materials resisting erosion-corrosion in crevices between rotating and fixed pump components. A new type of laboratory test facility enables experimental modeling of electrochemical and mechanical wear effects on rotating discs in the crevice in between. The paper presents the results of tests performed on a 17Cr-2Ni forged steel in a multiphase environment at room as well as elevated temperatures with varying degrees of sand loads and at different rotational speeds. The influence of rotat

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Young, Bruce A., and Richard J. Olson. "System Stiffness and Restraint Effects on Circumferential Crack Opening Displacements: A Rotational Stiffness Approach." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45404.

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Current crack opening displacement (COD) solutions for leak-before-break (LBB) analyses assume the ends of the cracked pipe, which is subjected to remote bending and internal pressure, are free to rotate. However, in plant piping systems, the pressure induced bending and imposed rotations are restrained, because the ends of the pipe are constrained by the rest of the piping system and other components. Hence, existing evaluation procedures, theoretically overestimate the COD values of a circumferential through-wall crack (TWC) in a piping system. These overestimations comprise one of the uncer

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Lombardo, P. "Tracking filters for translational and rotational motion components of high resolution radar targets." In 2002 International Radar Conference (Radar 2002). IEE, 2002. http://dx.doi.org/10.1049/cp:20020302.

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Gjukaj, Anita, Petar Cvetanovski, and Ferit Gashi. "THE EFFECT OF COLUMN WEB STIFFENERS ON MOMENT RESISTANCE AND DUCTILITY OF EXTENDED END-PLATE BOLTED CONNECTION." In 2nd Croatian Conference on Earthquake Engineering. University of Zagreb Faculty of Civil Engineering, 2023. http://dx.doi.org/10.5592/co/2crocee.2023.8.

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Extended end-plate bolted connections as moment-resistant connections between beam and column usually fall in the semi-rigid partial strength category. Simplicity, duplication, and economy made this joint widely used in steel frame structures. This type of joint is prevalent nowadays which requires knowledge of the entire nonlinear moment-rotation behaviour of the joints. Using ABAQUS FE software in this paper, a three-dimensional finite element model (FEM) is developed to identify the effect of different geometrical parameters on the behaviour of extended end-plate bolted connection with four

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Lambropoulos, John, and Don Golin. "Cutter Marks as Vibration-Induced Errors in Deterministic Microgrinding." In Optical Fabrication and Testing. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/oft.1994.omb3.

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Cutter marks, often referred to as mid-spatial frequency errors during deterministic microgrinding, have been observed on the surface of ground spherical components in a series of experiments at the Center for Optics Manufacturing (COM) at the University of Rochester. A simple model is presented to explain the recent observation that the number of cutter marks N during deterministic microgrinding of spherical components is approximately equal to the ratio of tool rotational rate fT (rpm) to work rotational rate fW for a wide range of these parameters. The model is based on the fundamental assu

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Hacks, Alexander, Sebastian Schuster, Hans Josef Dohmen, Friedrich-Karl Benra, and Dieter Brillert. "Turbomachine Design for Supercritical Carbon Dioxide Within the sCO2-HeRo.EU Project." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75154.

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The paper aims to give an overview over the keystones of design of the turbomachine for a supercritical CO2 (sCO2) Brayton cycle. The described turbomachine is developed as part of a demonstration cycle on a laboratory scale with a low through flow. Therefore the turbomachine is small and operates at high rotational speed. To give an overview on the development the paper is divided into two parts regarding the aerodynamic and mechanical design. The aerodynamic design includes a detailed description on the steps from choosing an appropriate rotational speed to the design of the compressor impel

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Badami, Marco, Mauro Ferrero, and Armando Portoraro. "Simulation Model and Experimental Validation of a CHP Plant With Micro Gas Turbine." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89423.

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The paper deals with a simulation model, developed in Matlab Simulink®, of a small-scale Combined Heat and Power (CHP) plant based on a recuperated micro gas turbine (mGT). A minimum data set, mainly obtainable from datasheets, was defined, that allows the model to simulate different mGT plants in the small-scale range with a good accuracy. The model implements the mass, energy and momentum equations of the main components of the power plant. A double control system has also been developed, with the aim of maintaining the rotational speed of the turbine /compressor assembly at the nominal fixe

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Cho, Jongjae, Hyungki Shin, Junhyun Cho, et al. "Design, Flow Simulation, and Performance Test for a Partial-Admission Axial Turbine Under Supercritical CO2 Condition." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76508.

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The development of a 60-kWe turbo generator that uses supercritical carbon dioxide (sCO2) cycle technology at the lab scale is described herein. The design concept for the turbo generator involved using commercially available components to reduce the developmental time and to increase the reliability of the machine. The developed supercritical partial-admission CO2 turbine has a single-stage axial-type design with a 73-mm rotor mean diameter. The design of the sCO2 turbine uses impulse and partial admission to reduce the axial force and rotational speed. We simulated the flow of the designed s

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