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Journal articles on the topic 'Coefficients: heat emission'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Song, Jun, Lihua Fan, Charles F. Forney, and Michael A. Jordan. "Using Volatile Emissions and Chlorophyll Fluorescence as Indicators of Heat Injury in Apples." Journal of the American Society for Horticultural Science 126, no. 6 (2001): 771–77. http://dx.doi.org/10.21273/jashs.126.6.771.

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Volatile emissions and chlorophyll fluorescence were investigated as potential signals of heat injury for apple [Malus sylvestris (L.) Mill. var. domestica (Borkh.) Mansf.] fruit. `McIntosh', `Cortland', `Jonagold', and `Northern Spy' apples were exposed to 46 °C for 0, 4, 8, or 12 hours (heat treatments). Following treatments, fruit were kept at 20 °C and evaluated after 1, 2, 4, or 7 days. Heat treatments induced volatile production including ethanol and ethyl acetate. The 8 and 12 hours heat treatments increased ethanol and ethyl acetate production in all four cultivars by as much as 170- a

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2

Szulc, Aleksandra, and Barbara Tomaszewska. "Perspectives on the use of geothermal heat pump systems to reduce low emitted air pollutants in the health resort areas." E3S Web of Conferences 116 (2019): 00087. http://dx.doi.org/10.1051/e3sconf/201911600087.

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The paper presents the possibilities of using geothermal heat pump systems in order to reduce the so-called “low-emission” in health resort area. The analysis was carried out on the example of the health resort Rabka-Zdrój, located in the southern part of Poland. Based on the acquired geological profiles of the boreholes, a detailed analysis of the rock mass was made in terms of thermal parameters. An interpretation of the potential unit heat output from individual boreholes was also made and the total lengths of vertical heat exchangers were determined for them. It was found that the health r

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3

Baeva, Margarita, Yann Cressault, and Petr Kloc. "Comparative Studies on the Radiative Heat Transfer in Arc Plasma and Its Impact in a Model of a Free-Burning Arc." Plasma 7, no. 3 (2024): 631–50. http://dx.doi.org/10.3390/plasma7030033.

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The radiative heat transfer in arc plasma models is considered from the point of view of its description in terms of a net emission coefficient, the method of spherical harmonics in its lowest order, and the discrete ordinate method. Net emission coefficients are computed, applying approximate analytical and numerical approaches and a multi-band representation of the spectral absorption coefficient with three kinds of its averaging and two datasets. Self-consistent access to the radiative heat transfer is applied to a two-dimensional axisymmetric model of a free-burning arc in argon at atmosph

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4

Suriya Sukarin. "Analysis of the Physical Characteristics of Helical Heat Exchangers for Reducing CO2 Emissions into the Atmosphere." Journal of Information Systems Engineering and Management 10, no. 4 (2025): 230–47. https://doi.org/10.52783/jisem.v10i4.8985.

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This research aims to analyze heat transfer behavior and evaluate the potential for reducing carbon dioxide emissions of elliptical cross-section helical coil heat exchangers. The study employs experimental testing and computational fluid dynamics (CFD) simulations under constant surface temperature conditions. The investigation focuses on the influence of physical characteristics, particularly the percent ovality (δ) and the hydraulic diameter to coil diameter ratio □(D_h/D_coil ) on heat transfer efficiency. Empirical results demonstrate that helical coils with high δ values (66.67%) and sma

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Baeva, Margarita, Petr Kloc, and Yann Cressault. "Radiative Heat Transfer in Models of DC Arc Plasma." PLASMA PHYSICS AND TECHNOLOGY 10, no. 1 (2023): 15–19. http://dx.doi.org/10.14311/ppt.2023.1.15.

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The radiative heat transfer in arc plasma models of a free-burning arc and a plasma torch in atmospheric pressure argon is taken into account in a self-consistent way. This is realized by the P1 method for solving the equation of radiative transfer and the multi-band approximation that considers the division of the emitted spectrum into a number of spectral bands. Net emission coefficients are evaluated by solving the equation of radiative transfer in three dimensions in an isothermal cylindrical plasma. The arc plasma parameters of the free-burning arc and the plasma torch obtained accounting

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Lai, Lina, and Yongzhong Qiao. "Effects of Primary Energy Consumption and Alternative Energy Patents on CO2 Emissions in China." Sustainability 16, no. 24 (2024): 10963. https://doi.org/10.3390/su162410963.

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China’s significant carbon emissions have attracted global attention, and the country has committed to reaching a peak in carbon emissions before 2030 and achieving carbon neutrality by 2060. It is crucial to achieve this goal by effectively controlling the combustion of primary fuels and developing alternative energy technologies. The existing literature has studied the effects of primary energy consumption on CO2 emissions, alternative energy technology on CO2 emissions, and energy patents on CO2 emissions. However, there are few studies on the effects of the relationship between primary ene

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Wang, Liangyu, and Michael F. Modest. "Treatment of Wall Emission in the Narrow-Band Based Multiscale Full-Spectrum k-Distribution Method." Journal of Heat Transfer 129, no. 6 (2006): 743–48. http://dx.doi.org/10.1115/1.2717936.

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The multiscale full-spectrum k-distribution (MSFSK) method has become a promising method for radiative heat transfer in inhomogeneous media. In this paper a new scheme is proposed to extend the MSFSK’s ability in dealing with boundary wall emission by distributing this emission across the different gas scales. This scheme pursues the overlap concept of the MSFSK method and requires no changes in the original MSFSK formulation. A boundary emission distribution function is introduced and two approaches of evaluating the function are outlined. The first approach involves line-by-line integration

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8

Gnybida, M., Ch Rümpler, and V. R. T. Narayanan. "Optimal Band Selection for the Calculation of Planck Mean Absorption Coefficients." PLASMA PHYSICS AND TECHNOLOGY 4, no. 1 (2017): 70–73. http://dx.doi.org/10.14311/ppt.2017.1.70.

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Radiative heat transfer is a major heat loss mechanism in thermal plasmas generated during arc flashes/faults in switchgear applications or during high current interruption in low voltage circuit breakers. A common way to calculate the radiation balance is by means of approximate non-gray radiation models like P1 or discrete ordinates (DOM), where the frequency dependent absorption and emission are described in a number of frequency intervals (bands) using a constant absorption coefficient in each band. Current work is focused on finding the optimal number of bands as well as band interval bou

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9

Liu, L. H., L. Zhao, and B. X. Li. "A concept of equivalent absorption and emission coefficients for gray analysis of radiative heat transfer." Journal of Quantitative Spectroscopy and Radiative Transfer 90, no. 2 (2005): 253–58. http://dx.doi.org/10.1016/j.jqsrt.2004.04.011.

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10

Semenov, B. A., and N. A. Ozerov. "Indirect Determination of Real Heat-Emission Coefficients in Air-Cooling Systems of Operating Glass Furnaces." Glass and Ceramics 75, no. 1-2 (2018): 42–46. http://dx.doi.org/10.1007/s10717-018-0025-6.

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11

DUCOMET, BERNARD, and ŠÁRKA NEČASOVÁ. "ASYMPTOTIC BEHAVIOR OF THE MOTION OF A VISCOUS HEAT-CONDUCTING ONE-DIMENSIONAL GAS WITH RADIATION: THE PURE SCATTERING CASE." Analysis and Applications 11, no. 01 (2013): 1350003. http://dx.doi.org/10.1142/s0219530513500036.

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We study the large-time behavior of the solution of an initial-boundary value problem for the equations of 1D motions of a compressible viscous heat-conducting gas coupled with radiation through a radiative transfer equation. Assuming only scattering processes between matter and photons (neglecting absorption and emission) and suitable hypotheses on the transport coefficients, we prove that the unique weak solution of the problem converges toward the static state.

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12

Li, Ning, Youna Hua, Jia Wang, Juncheng Li, and Wei Wang. "The Effect of Heat Treatment and Acetylation on Formaldehyde Emission in Cellulose: A Molecular Dynamics Simulation Study." Forests 14, no. 4 (2023): 839. http://dx.doi.org/10.3390/f14040839.

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Formaldehyde emission from cellulosic materials is an important consideration, especially for wood products, which are regulated by many countries in terms of legislation and may affect the health of users. In this study, molecular dynamics simulations were performed at different temperatures using two common wood-modification methods, heat treatment, and acetylation, and the diffusion coefficients of the models as well as the mechanical properties, were discussed. The results showed that the mean square displacement of the common heat treatment model was best at 493 K. The acetylated cellulos

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13

Shorstkii, Ivan, and Evgeny Koshevoi. "Drying Technology Assisted by Nonthermal Pulsed Filamentary Microplasma Treatment: Theory and Practice." ChemEngineering 3, no. 4 (2019): 91. http://dx.doi.org/10.3390/chemengineering3040091.

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Nonthermal pulsed filamentary microplasma treatment for drying is a nonthermal technology with promising perspectives to dehydrate plant agricultural materials. The modified set of Luikov’s equations for heat, mass and pressure transfer, has been used to analyze nonthermal pulsed filamentary microplasma treatment effects. The finite element method in combination with the step-by-step finite-difference method for a coupled system of differential equations in partial derivatives was used for numerical simulation of heat, humidity and pressure potentials transfer. The drying time of samples treat

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14

Seetharam, Karanamu, Konda Jayaramireddy, and Kalesha Vali Shaik. "Significance of thermal boundary layer analysis of MHD chemically radiative dissipative casson nanofluid flow over a stretching sheet with heat source." i-manager’s Journal on Mathematics 12, no. 2 (2023): 22. http://dx.doi.org/10.26634/jmat.12.2.19826.

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A mathematical model that incorporates thermal emission, glutinous indulgence, heat source/sink, substance response, with suction was used to learn the MHD pour of Casson nanofluid in excess of a nonlinearly porous stretched page. There are a series of nonlinear ordinary differential equations that govern the biased differential equations through proper resemblance transformations, as well as then solved by the Homotopy Analysis Approach (HAM). Numerical data and plots are employed to examine the physical limitations on liquid speed, heat, and attentiveness. To examine the flow characteristics

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15

Chai, Tianfeng, Xinrong Ren, Fong Ngan, Mark Cohen, and Alice Crawford. "Estimation of power plant SO₂ emissions using the HYSPLIT dispersion model and airborne observations with plume rise ensemble runs." Atmospheric Chemistry and Physics 23, no. 19 (2023): 12907–33. http://dx.doi.org/10.5194/acp-23-12907-2023.

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Abstract. The SO2 emission rates from three power plants in North Carolina are estimated using the HYSPLIT Lagrangian dispersion model and aircraft measurements made on 26 March 2019. To quantify the underlying modeling uncertainties in the plume rise calculation, dispersion simulations are carried out in an ensemble using a total of 15 heat release parameters. For each heat release, the SO2 emission rates are estimated using a transfer coefficient matrix (TCM) approach and compared with the Continuous Emissions Monitoring Systems (CEMS) data. An “optimal” member is first selected based on the

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16

Duan, Pengfei, Chaokui Qin, and Zhiguang Chen. "Experimental Study of the Influence of Natural Gas Constituents on CO Emission from Chinese Gas Cooker." Energies 12, no. 20 (2019): 3997. http://dx.doi.org/10.3390/en12203997.

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In China, it has become a more common practice to introduce natural gases from different sources into the same distribution system to improve supply security and reliability. Variable gas constituents may cause a negative impact on the performance of domestic gas appliances. This paper aims to study the CO emission of a Chinese gas cooker under different constituents of natural gas. A typical Chinese gas cooker with two burners, each of which has a nominal heat input of 3.8 kW, was selected. One of the burners was modified to a forced-mixed mode to replace primary air injection. Within operati

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17

Minin, S. I., D. A. Koshkarov, A. A. Forshev, et al. "Analysis of the possibility of replacing carbon with hydrogen in the conditions of smelting cast iron from vanadium-containing titanomagnetites." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 79, no. 8 (2023): 629–35. http://dx.doi.org/10.32339/0135-5910-2023-8-629-635.

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75 % of the total carbon dioxide emissions by ferrous metallurgy enterprises is generated in the blast furnace process. One of the directions of CO2 emission reduction in pig iron production is partial replacement of carbon monoxide with hydrogen as a reducing agent. It is shown that such a replacement can lead to a decrease in the total carbon consumption due to reduction of heat consumption for the direct reduction of iron oxides. Using a mathematical model of the blast furnace process, the efficiency of partial replacement of process fuel (coke, natural gas, pulverized coal) with a hydrogen

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18

Deng, Qinqin, Shengnan Zhang, Ming Shan, and Ji Li. "Research on Envelope Thermal Performance of Ultra-Low Energy Rural Residential Buildings in China." Sustainability 15, no. 8 (2023): 6931. http://dx.doi.org/10.3390/su15086931.

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Rural energy consumption plays an important role in energy consumption due to the improvement of rural residents’ living quality requirements in China. Ultra-low energy rural residential buildings are proposed to decrease rural energy consumption. First of all, this paper aims to provide the definition of ultra-low energy rural residential buildings, which is to reduce 50% of the building energy consumption of the rural residential benchmark building according to the Chinese standard for energy efficiency of rural residential buildings. Secondly, this paper presents the heat transfer coefficie

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19

Kwon, Seung-Jun, and Xiao-Yong Wang. "A Hydration-Based Integrated Model to Evaluate Properties Development and Sustainability of Oyster Shell Powder–Cement Binary Composites." Buildings 14, no. 6 (2024): 1578. http://dx.doi.org/10.3390/buildings14061578.

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Currently, oyster shell powder (OSP) is becoming more widely used in the production of cement-based materials. The purpose of this study is to propose a predictive model that can predict the properties of concrete materials incorporating oyster shell powder. The methods of this prediction model are given as follows. First, based on the measurement results of the heat of hydration in the first 7 days, the prediction parameters of the hydration model are obtained. Secondly, based on the hydration model, the measured results of the heat of hydration were extrapolated, and the heat of hydration fr

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20

Sankari, Siva, M. Eswara Rao, Awatif M. A. Elsiddieg, et al. "Analytical solution of MHD bioconvection Williamson nanofluid flow over an exponentially stretching sheet with the impact of viscous dissipation and gyrotactic microorganism." PLOS ONE 20, no. 3 (2025): e0306358. https://doi.org/10.1371/journal.pone.0306358.

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Nanofluids achieve high thermal transport efficiency by uniformly dispersing small particles in base liquids, significantly enhancing the heat transfer coefficients and making them vital in various thermal engineering applications. The research examines non-uniform thermal conductivity and activation energy critical for accurately describing fluid behaviour. The study incorporates bioconvection to prevent nanoparticle settling and ensure fluid stability through motile microorganisms. The governing partial differential equations are converted into ordinary differential equations that are solved

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21

Martin-Fernandez, Marcos, and Sergio Villullas. "The EM Method in a Probabilistic Wavelet-Based MRI Denoising." Computational and Mathematical Methods in Medicine 2015 (2015): 1–21. http://dx.doi.org/10.1155/2015/182659.

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Human body heat emission and others external causes can interfere in magnetic resonance image acquisition and produce noise. In this kind of images, the noise, when no signal is present, is Rayleigh distributed and its wavelet coefficients can be approximately modeled by a Gaussian distribution. Noiseless magnetic resonance images can be modeled by a Laplacian distribution in the wavelet domain. This paper proposes a new magnetic resonance image denoising method to solve this fact. This method performs shrinkage of wavelet coefficients based on the conditioned probability of being noise or det

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22

Volchyn, I. A., L. S. Haponych, and V. O. Mokretskyy. "Estimation and forecasting of carbon dioxide emissions from coal-fired thermal power plants in Ukraine." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 5 (October 30, 2022): 80–88. http://dx.doi.org/10.33271/nvngu/2022-5/080.

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Purpose. Development and verification of a method for calculating and forecasting CO2 emissions from coal combustion at thermal power plants based on proximate analysis data. Calculation of gross and specific CO2 emissions per unit of output energy and mass of coal consumed at Ukrainian thermal power plants (TPPs). Methodology. Methods of mathematical statistics were used for processing the data of ultimate and proximate analysis of 170samples of A, L, G, and LFG coal ranks with low heat value on operating state in the range of 17.2 to 31.0 MJ/kg and ash content on dry state (Ad) in the range

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23

Berg, Peter, and Michael L. Pace. "Continuous measurement of air–water gas exchange by underwater eddy covariance." Biogeosciences 14, no. 23 (2017): 5595–606. http://dx.doi.org/10.5194/bg-14-5595-2017.

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Abstract. Exchange of gases, such as O2, CO2, and CH4, over the air–water interface is an important component in aquatic ecosystem studies, but exchange rates are typically measured or estimated with substantial uncertainties. This diminishes the precision of common ecosystem assessments associated with gas exchanges such as primary production, respiration, and greenhouse gas emission. Here, we used the aquatic eddy covariance technique – originally developed for benthic O2 flux measurements – right below the air–water interface (∼ 4 cm) to determine gas exchange rates and coefficients. Using

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Зиновьева, В. В., М. С. Лучкин, М. В. Шишанов та А. Ю. Налетов. "ИНТЕНСИФИКАЦИЯ ТЕПЛООТДАЧИ В ПРОСТЕНКАХ ПЕЧНЫХ КАМЕР КОКСОВЫХ БАТАРЕЙ". Koks i khimiya, № 7-2024 (25 липня 2024): 11–16. https://doi.org/10.52351/00232815_2024_7_11.

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В статье проведено исследование излучательной способности трехатомных газов, таких как Н2О и СО2 в зависимости от плотности и толщины газового слоя (длины лучей). Показано, что при небольшой длине лучей доминирует излучательная способность диоксида углерода, а при большой длине лучей – водяного пара. Оценка коэффициентов теплоотдачи излучением в отопительном канале «на огне» на примере печных камер коксовых батарей АО «Москокс» свидетельствует о доминирующем вкладе в теплоотдачу паров воды, которая увеличивается с ростом его содержания в продуктах сгорания коксового газа. Вычислительными экспе

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Zavalishin, N. N. "Coupled modeling of peatlands carbon cycle and carbon dioxide emission from their peat deposits." IOP Conference Series: Earth and Environmental Science 1093, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1755-1315/1093/1/012009.

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Abstract COmplex Model of BOg LAndscapes (COMBOLA) is a set of dynamic models of carbon and nitrogen turnover, net ecosystem exchange, water balance, heat and water transport, generation and transfer of CO2 and CH4 in a peat deposit on a number of time scales. Combined modeling of carbon turnover and carbon dioxide emission from peat deposits on an annual time scale is carried out as part of COMBOLA for several bog landscapes in Western-Siberian south taiga. One-dimensional vertical reaction-diffusion model for carbon dioxide emission from peat deposit is combined with compartment carbon cycle

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Nikolaj, Volchenko, Volchenko Aleksandr, Volchenko Dmitriy, et al. "FEATURES OF THE ESTIMATION OF THE INTENSITY OF HEAT EXCHANGE IN SELF-VENTILATED DISK-SHOE BRAKES OF VEHICLES." Eastern-European Journal of Enterprise Technologies 1, no. 5 (97) (2019): 47–53. https://doi.org/10.15587/1729-4061.2019.154712.

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Analysis of the energy load of a cargo vehicle self-ventilated disk-brake system, which significantly affects the operational parameters of its friction pairs is made. Plastic deformation of the disk friction belts can be observed under cyclic loading of the brake friction pairs, and the deformation process is aggravated by the fact that the yield strength of the material drops in their local zones. Due to plastic friction during compression of the disk friction belts heated zones, therefore they bulge, further leading to the formation of microcracks. The research is based on the fact that dur

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Pei, Yanbin, Xuanhui Qu, Qilu Ge, and Tiejun Wang. "Effect of Heat Treatment Temperature on Microstructure and Properties of PM Borated Stainless Steel Prepared by Hot Isostatic Pressing." Materials 14, no. 16 (2021): 4646. http://dx.doi.org/10.3390/ma14164646.

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Borated stainless steel (BSS) with a boron content of 1.86% was prepared by a powder metallurgy process incorporating atomization and hot isostatic pressing. After solution quenching at 900–1200 °C, the phase composition of the alloy was studied by quantitative X-ray diffraction phase analysis. The microstructure, fracture morphology, and distributions of boron, chromium, and iron in grains of the alloy were analyzed by field-emission scanning electron microscopy with secondary electron and energy-dispersive spectroscopy. After the coupons were heat treated at different temperatures ranging fr

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Mačiulaitis, Romualdas, Vladas Praniauskas, and Grigory Yakovlev. "RESEARCH INTO THE FIRE PROPERTIES OF WOOD PRODUCTS MOST FREQUENTLY USED IN CONSTRUCTION." Journal of Civil Engineering and Management 19, no. 4 (2013): 573–82. http://dx.doi.org/10.3846/13923730.2013.810169.

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Analysis of various wood products tested under the exposure to 30 kW/m2, 35 kW/m2, 40 kW/m2, 45 kW/m2and 50 kW/m2 heat flows in accordance with LST ISO 5657:1999 “Reaction to fire tests – ignitibility of building products using a radiant heat source” was performed. Selected boards were subjected to reaction to fire tests in accordance with LST EN 13823:2010 “Reaction to fire tests for building products”. The tests were performed on 6 mm, 10 mm, 15 mm and 18 mm thick oriented strand boards (OSBs) and 24-mm thick wood particle boards (WPBs), both impregnated with BAK-1 fire retardant solution an

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Polivyanchuk, A., M. Smirny, S. Romanenko, et al. "RESEARCH OF EFFICIENCY ECOLOGICAL DIAGNOSTICS SYSTEM OF HEAT ENGINES AND BOILER PLANTS." Municipal economy of cities 6, no. 152 (2019): 73–78. http://dx.doi.org/10.33042/2522-1809-2019-6-152-73-78.

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A universal, multifunctional system of environmental diagnostics of heat engines and boiler plants has been created, which allows one to determine indicators characterizing the chemical and physical effect of these objects on the environment: concentrations, mass, specific and average operational emissions of pollutants, noise, thermal pollution, vibration. This measuring system consists of instrumental, testing, demonstration and laboratory modules, which allows you to use it as a diagnostic tool, training and test bench and laboratory; as well as apply it in various fields: transport, energy

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Suszanowicz, Dariusz. "Optimization of ventilation system in the open office space." MATEC Web of Conferences 174 (2018): 01009. http://dx.doi.org/10.1051/matecconf/201817401009.

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The paper presents the results of study into the air parameters in open space offices. As office workers spend about 1/3 of the day in such spaces, it is important to provide them with the right climate comfort, and that is determined, most importantly, by: the temperature and humidity of the air, quality of the air, and the concentration of CO2. Two objects of study were selected - both of them open space facilities, each with a different intensity of use. In the course of study, measurements were taken on the basis of which the distributions of temperature, humidity, and concentrations of CO

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Guo, Xulong, Yang Zhou, Huiling Qi, Shichuan Jiang, and Dongping Xiao. "Study on the Uniformity Criterion of Homogenization for W-Mo Superalloys." Journal of Physics: Conference Series 2956, no. 1 (2025): 012036. https://doi.org/10.1088/1742-6596/2956/1/012036.

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Abstract In order to establish the homogenization criteria for superalloys containing W and Mo, this paper took GH5188 (containing W), GH4141 (containing Mo), and GH3128 (containing W and Mo) alloys as examples for research and analysis. Firstly, the microstructure and elemental segregation of the alloy after heat treatment with different homogenization regimes were observed using a desktop scanning electron microscope (SEM) and a field emission electron probe microanalyser. Secondly, the theoretical and actual segregation coefficients of the alloy elements after heat treatment with different

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Kanafani, Kai, Jonathan Magnes, Søren Munch Lindhard, and Maria Balouktsi. "Carbon Emissions during the Building Construction Phase: A Comprehensive Case Study of Construction Sites in Denmark." Sustainability 15, no. 14 (2023): 10992. http://dx.doi.org/10.3390/su151410992.

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Buildings are major contributors of carbon emissions and related global warming. Emissions occur along all building stages, from a whole-life perspective, including material production, construction processes, building operations, maintenance and end-of-life processes. Upfront emissions include processes before building operations. They can be influenced immediately and will have a positive effect today. However, mitigation potentials during the construction stage are often overseen in research. This study presents an analysis of the carbon emissions of 61 Danish construction sites based on th

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Jastrząb, Krzysztof. "Database for content of mercury in Polish brown coal." E3S Web of Conferences 28 (2018): 01017. http://dx.doi.org/10.1051/e3sconf/20182801017.

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Poland is rated among the countries with largest level of mercury emission in Europe. According to information provided by the National Centre for Balancing and Management of Emissions (KOBiZE) more than 10.5 tons of mercury and its compounds were emitted into the atmosphere in 2015 from the area of Poland. Within the scope of the BazaHg project lasting from 2014 to 2015 and co-financed from the National Centre of Research and Development (NCBiR) a database was set up with specification of mercury content in Polish hard steam coal, coking coal and brown coal (lignite) grades. With regard to do

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Liu, Lin, Huiyu He, Yushuang Zhu, et al. "Spatiotemporal Distribution Characteristics and Multi-Factor Analysis of Near-Surface PM2.5 Concentration in Local-Scale Urban Areas." Atmosphere 14, no. 10 (2023): 1583. http://dx.doi.org/10.3390/atmos14101583.

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Near-surface PM2.5 concentrations have been greatly exacerbated by urban land expansion and dense urban traffic. This study aims to clarify the effects of multiple factors on near-surface PM2.5 concentrations from three perspectives of background climatic variables, urban morphology variables, and traffic-related emission intensity. First, two case areas covering multiple local blocks were selected to conduct mobile measurements under different climatic conditions. The observed meteorological parameters and PM2.5 concentration were obtained through GIS-based imaging. These interpolation result

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KOPÚNEK, JURAJ, JOZEF MARTINKA, PETER RANTUCH, TOMÁŠ ŠTEFKO, IGOR WACHTER, and FILIP MARTINKA. "PRELIMINARY STUDY OF DEPENDENCE OF SMOKE AND CARBON MONOXIDE EMISSION ON HEAT RELEASE RATE FROM FAST-GROWING WOOD SPECIES." Wood Research 69, no. 2 (2024): 222–36. http://dx.doi.org/10.37763/wr.1336-4561/69.2.222236.

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The aim of this paper is to create the model for prediction of carbon monoxide release rate (CORR) and smoke production rate (SPR) from heat release rate (HRR) of fast-growing wood species. The model is independent on wood species, thus is suitable for all fast-growing wood species. Three wood species hybrid poplar J-105 (Populus nigra × P. maximowiczii A. Henry), white willow (Salix alba L.) and black locust (Robinia pseudoacacia L.) were used for universal model creation. The heat release rate, smoke production rate and carbon monoxide release rate have been measured at three heat fluxes (25

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Zheng, Bowen, Zhenghe Song, Enrong Mao, et al. "An ANN-PSO-Based Method for Optimizing Agricultural Tractors in Field Operation for Emission Reduction." Agriculture 12, no. 9 (2022): 1332. http://dx.doi.org/10.3390/agriculture12091332.

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Aiming at the serious problem of agricultural tractor emission pollution, especially the limitation of nitrogen dioxide (NOx) and soot emissions, we took an agricultural diesel engine as the research object, and a diesel engine combustion chamber model was established for both simulated calculations and experimental verification analysis. The in-cylinder pressure and heat release obtained from the combustion chamber model simulation calculations were within 6% error of the experimental data. The overall trend of change was basically consistent. The established model can simulate the working co

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Wang, Lipeng, Tao Chi, and Xuebo Chen. "Numerical assessment of combustion parameters on thermal regenerative ladle preheating." Thermal Science, no. 00 (2024): 271. https://doi.org/10.2298/tsci241005271w.

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Ladle preheating, as a crucial component of steel production, exerts a notable influence on both energy consumption and NOx emission levels throughout the entire production process. To investigate the impact of the excess air coefficient on the preheating process of the regenerative ladle, this paper firstly adopts numerical simulation method; a multi-field coupled mathematical model is established for simulating the gas combustion, flow, and coupled heat transfer within the thermal storage ladle. This approach is grounded in the standard k-? turbulence model, the component transport combustio

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JI, LINGFEI, and YIJIAN JIANG. "SPONTANEOUS POLARIZATION IN UNCONVENTIONAL Ta2O5 DIELECTRIC CERAMICS BY LASER SINTERING." Journal of Advanced Dielectrics 01, no. 02 (2011): 197–201. http://dx.doi.org/10.1142/s2010135x1100032x.

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Spontaneous polarization was found in Ta2O5 dielectric ceramics prepared by laser sintering technique. After heat corrosion, 90° and 180° domains in the ceramics was observed by field emission scanning electron micrographs. The crystal structure of the laser-sintered ceramics at RT was determined as monoclinic phase, which indicates the lattice distortion existed in the ceramics. The variation of O-Ta-O bending vibration mode was deduced from the variation of phonon mode at the low wave-number (57 cm-1 and 250 cm-1). The enhancement of effective electric field for tantalum atoms due to the lat

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Lei, Xue Cai, and Ke Pang. "Tribological Properties of CVD Diamond Films against Graphite." Key Engineering Materials 689 (April 2016): 86–90. http://dx.doi.org/10.4028/www.scientific.net/kem.689.86.

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In this investigation, micro crystalline diamond (MCD) and nanocrystalline diamond (NCD) films are deposited on cemented carbide (WC-Co) balls by hot filament chemical vapor deposition (HFCVD) technique. After deposition, MCD and NCD films are characterized by field emission scanning electron microscopy (FESEM) and Raman spectroscopy. Then frictional tests are carried out between CVD diamond coated balls and graphite. The results show that the MCD-graphite and NCD-graphite tribo-pairs exhibit comparable frictional coefficients, while the wear rate of graphite in MCD-graphite working pair is mu

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Ichoku, C., and L. Ellison. "Global top-down smoke aerosol emissions estimation using satellite fire radiative power measurements." Atmospheric Chemistry and Physics Discussions 13, no. 10 (2013): 27327–86. http://dx.doi.org/10.5194/acpd-13-27327-2013.

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Abstract. Biomass burning occurs seasonally in most vegetated parts of the world, consuming large amounts of biomass fuel, generating intense heat energy, and emitting corresponding amounts of smoke plumes that comprise different species of aerosols and trace gases. Accurate estimates of these emissions are required as model inputs to evaluate and forecast smoke plume transport and impacts on air quality, human health, clouds, weather, radiation, and climate. Emissions estimates have long been based on bottom-up approaches that are not only complex, but also fraught with compounding uncertaint

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Egorov, E. G., A. G. Kulagina, N. Yu Luiya, R. V. Fedorov, and V. N. Pichugin. "Temperature modes of the contactor contacts during the test for the limiting breaking capacity." E3S Web of Conferences 220 (2020): 01065. http://dx.doi.org/10.1051/e3sconf/202022001065.

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The processes of electric arc quenching of an electromagnetic contactor during testing for ultimate breaking capacity are considered. The conditions for facilitating the successful arc quenching when turning off the limiting currents are shown: by reducing the phase shift between current and voltage, by reducing the amplitude of the restriking and recovery voltages. The processes of anode heating during arcing (heat saturation mode), after the change of polarity and transition of the current through zero, processes on the cathode in the temperature equalization mode are considered. The mathema

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Fisher, Daniel, Martin J. Wooster, Weidong Xu, Gareth Thomas, and Puji Lestari. "Top-Down Estimation of Particulate Matter Emissions from Extreme Tropical Peatland Fires Using Geostationary Satellite Fire Radiative Power Observations." Sensors 20, no. 24 (2020): 7075. http://dx.doi.org/10.3390/s20247075.

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Extreme fires in the peatlands of South East (SE) Asia are arguably the world’s greatest biomass burning events, resulting in some of the worst ambient air pollution ever recorded (PM10 > 3000 µg·m−3). The worst of these fires coincide with El Niño related droughts, and include huge areas of smouldering combustion that can persist for months. However, areas of flaming surface vegetation combustion atop peat are also seen, and we show that the largest of these latter fires appear to be the most radiant and intensely smoke-emitting areas of combustion present in such extreme fire episodes. Fi

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Baghi, R., P. Durand, C. Jambert, et al. "A new disjunct eddy-covariance system for BVOC flux measurements – validation on CO<sub>2</sub> and H<sub>2</sub>O fluxes." Atmospheric Measurement Techniques 5, no. 12 (2012): 3119–32. http://dx.doi.org/10.5194/amt-5-3119-2012.

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Abstract. The disjunct eddy covariance (DEC) method is an interesting alternative to the conventional eddy covariance (EC) method because it allows the estimation of turbulent fluxes of species for which fast sensors are not available. We have developed and validated a new disjunct sampling system (called MEDEE). This system is built with chemically inert materials. Air samples are taken quickly and alternately in two cylindrical reservoirs, the internal pressures of which are regulated by a moving piston. The MEDEE system was designed to be operated either on the ground or aboard an aircraft.

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Busquets, David Jeronimo, Carlos Bloem, Amparo Borrell, and Maria Dolores Salvador. "Influence of SiC Addition on Mechanical Behavior of Thermal Barriers with the Aid of Acoustic Emission." Journal of Composites Science 5, no. 1 (2021): 16. http://dx.doi.org/10.3390/jcs5010016.

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The improvement of high temperature materials with lower heat transfer coefficients lead to the development of thermal barrier coatings (TBCs). One of the most widely used materials for thermal barrier coatings is Y2O3 stabilized ZrO2 (Y-TZP) because of its excellent shock resistance, low thermal conductivity, and relatively high coefficient of thermal expansion. The aim of this work is to study the TBCs mechanical behavior with the addition of SiC into the suspension of Y-TZP/Al2O3 by acoustic emission (AE). Additionally, a microstructural analysis and a finite elements model were carried out

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Busquets, David Jeronimo, Carlos Bloem, Amparo Borrell, and Maria Dolores Salvador. "Influence of SiC Addition on Mechanical Behavior of Thermal Barriers with the Aid of Acoustic Emission." Journal of Composites Science 5, no. 1 (2021): 16. http://dx.doi.org/10.3390/jcs5010016.

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The improvement of high temperature materials with lower heat transfer coefficients lead to the development of thermal barrier coatings (TBCs). One of the most widely used materials for thermal barrier coatings is Y2O3 stabilized ZrO2 (Y-TZP) because of its excellent shock resistance, low thermal conductivity, and relatively high coefficient of thermal expansion. The aim of this work is to study the TBCs mechanical behavior with the addition of SiC into the suspension of Y-TZP/Al2O3 by acoustic emission (AE). Additionally, a microstructural analysis and a finite elements model were carried out

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Yin, Shaowu, Yongle Shi, Lige Tong, Li Wang, and Yulong Ding. "Performance Simulation and Benefit Analysis of Ammonia Absorption Cooling and Heating Dual-Supply System Based on Off-Peak Electricity Heat Storage." Energies 12, no. 12 (2019): 2298. http://dx.doi.org/10.3390/en12122298.

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The energy consumption of urban central heating in northern China is two to four times that in northern Europe and other countries. Beijing has adopted measures, such as ‘coal to gas’ and ‘coal to electricity’, to reduce environmental pollution caused by central heating. Given a peak-to-valley difference in the electricity supply of power plant, which is uneven day and night, this study proposes to store the night-time off-peak electricity in the form of heat energy and drive the ammonia absorption system in the form of steam or hot water during peak or flat electricity. Simulation results of

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Xie, Xiaoning, Anmin Duan, Zhengguo Shi, et al. "Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle." Atmospheric Chemistry and Physics 20, no. 18 (2020): 11143–59. http://dx.doi.org/10.5194/acp-20-11143-2020.

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Abstract. Previous observational evidence and numerical simulations have revealed that the surface sensible heating in spring (March–April–May, MAM) over the Tibetan Plateau (TPSH) can affect the Asian regional hydrological cycle, surface energy balance, and climate through altering atmospheric heat source of the Tibetan Plateau (TP). This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by using CAM4-BAM (version 4 of the Community Atmosphere Model coupled to a bulk aerosol model), MERRA-2 (version 2 of the Modern-Era Retrospective anal

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Wang, Zhenglong, Jiahui Wu, Yang Kou, Menglin Zhang, and Huan Jiang. "Collaborative Optimization Scheduling of Source-Network-Load-Storage System Based on Ladder-Type Green Certificate–Carbon Joint Trading Mechanism and Integrated Demand Response." Sustainability 16, no. 22 (2024): 10104. http://dx.doi.org/10.3390/su162210104.

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To fully leverage the potential flexibility resources of a source-network-load-storage (SNLS) system and achieve the green transformation of multi-source systems, this paper proposes an economic and low-carbon operation strategy for an SNLS system, considering the joint operation of ladder-type green certificate trading (GCT)–carbon emission trading (CET), and integrated demand response (IDR). Firstly, focusing on the load side of electricity–heat–cooling–gas multi-source coupling, this paper comprehensively considers three types of flexible loads: transferable, replaceable, and reducible. An

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Eguiarte, Olaia, Antonio Garrido-Marijuán, Pablo de Agustín-Camacho, Luis del Portillo, and Ander Romero-Amorrortu. "Energy, Environmental and Economic Analysis of Air-to-Air Heat Pumps as an Alternative to Heating Electrification in Europe." Energies 13, no. 15 (2020): 3939. http://dx.doi.org/10.3390/en13153939.

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Heat pumps (HP) are an efficient alternative to non-electric heating systems (NEHS), being a cost-effective mean to support European building sector decarbonization. The paper studies HP and NEHS performance in residential buildings, under different climate conditions and energy tariffs, in six different European countries. Furthermore, a primary energy and environmental analysis is performed to evaluate if the use of HPs is more convenient than NEHS, based on different factors of the electric mix in each country. A specific HP model is developed considering the main physical phenomena occurri

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Zelensky, S. E., O. S. Kolesnik, and V. P. Yashchuk. "The Role of Air in Laser-Induced Thermal Emission of Surface Layers of Porous Carbon Materials." Ukrainian Journal of Physics 68, no. 10 (2023): 652. http://dx.doi.org/10.15407/ujpe68.10.652.

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The influence of the surrounding air on the amplitude and shape of thermal radiation pulses (at a wavelength of 430 nm) during the heating of the surface layer of a porous carbon material (to temperatures of the order of 2000–3000 K) by the radiation of a Q-switched neodymium laser is studied. When the pressure of the surrounding air is reduced to forevacuum conditions, the experiments showed a one-and-a-half-fold increase in the amplitude of pulsed signals of thermal radiation and an increase in the decay time of the glow by about a third. Numerical calculations of the dynamics of the tempera

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