Artigos de revistas: "Gaseous"

1

PEIMBERT, M. "Gaseous Nebulae: Physics of Thermal Gaseous Nebulae." Science 229, n.º 4714 (16 de agosto de 1985): 644. http://dx.doi.org/10.1126/science.229.4714.644.

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2

Gonchar, N., e M. Morkin. "A SENSITIVITY EVALUATION OF GAS-LIFT PROBE INCLUDED INTO CLADDING FAILURE DETECTION SYSTEM BY THE MODEL OF GASEOUS FISSION PRODUCT SOLUTION/DEGASSING INTO LEAD COOLANT". PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2021, n.º 1 (26 de março de 2021): 135–44. http://dx.doi.org/10.55176/2414-1038-2021-1-135-144.

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Gas-lift probe is an element of cladding failure detection system of perspective lead cooled reactor. Its function is local measurement of gaseous fission product activity in the coolant and the most defected fuel assembly localization. In the coolant leaving the defected fuel assembly the specific activity of gaseous fission products is higher than the average one in the primary circuit. In the barbotage channel of gas-lift probe gaseous fission products diffuse through the bubble interface surface into the volume of the bubbles. The bubbles deliver gaseous fission product to interface surface in the separation volume. The gas enriched with radioactive gaseous fission product goes to measurement volume of the probe. The more significant the damage and the closer the defective fuel assembly is located to the probe input, the more gaseous fission product activity will be registered. The paper presents a model of gaseous activity transfer from cladding defect to probe measuring volume. The gaseous activity transfer is described on the basis of the inert gases dissolution/degassing processes in lead. The gas-lift probe sensitivity was estimated as the ratio of the entry velocity of gaseous activity into the measurement volume to the exit one into the coolant through fuel assemblies cladding defects. A gas-lift probe sensitivity for exposed fuel surface calculated as an example. Gaseous fission products with significant gamma radiation are considered. The calculation results are presented in the article.

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3

Likal'ter, Alexander A. "Gaseous metals". Uspekhi Fizicheskih Nauk 162, n.º 7 (1992): 119. http://dx.doi.org/10.3367/ufnr.0162.199207c.0119.

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4

Likal'ter, Alexander A. "Gaseous metals". Soviet Physics Uspekhi 35, n.º 7 (31 de julho de 1992): 591–605. http://dx.doi.org/10.1070/pu1992v035n07abeh002249.

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5

van der Graaf, H. "Gaseous detectors". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 628, n.º 1 (fevereiro de 2011): 27–30. http://dx.doi.org/10.1016/j.nima.2010.06.280.

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6

Sugimoto, Daiichiro. "Gaseous Models". Symposium - International Astronomical Union 113 (1985): 207–18. http://dx.doi.org/10.1017/s0074180900147394.

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We can understand physics of self-gravitating system in terms of gaseous models in so far that their global natures and effects of self-gravity are concerned. Here summarized what are known in idealized gaseous models. They include gravothermal collapse/expansion in linear and non-linear regimes, and post-collapse evolution with gravothermal oscillation. Also discussed are their relations with discrete system and with treatment in statistical mechanics.

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7

Ruskin, Keith J. "Gaseous Anomaly". Anesthesiology 88, n.º 6 (1 de junho de 1998): 1696. http://dx.doi.org/10.1097/00000542-199806000-00055.

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8

Hao-Hui, Tang, Guo Jun-Jun, Wang Xiao-Lian e Xu Zi-Zong. "A new gaseous detector — micro mesh gaseous structure". Chinese Physics C 33, n.º 9 (25 de agosto de 2009): 777–80. http://dx.doi.org/10.1088/1674-1137/33/9/013.

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9

Blecha, Tomas, Vaclav Smitka, Michal Bodnar e Jiri Stulik. "Simultaneous Detection of NH3 and NO2 by Modified Impedance Spectroscopy in Sensors Based on Carbon Nanotubes". Energies 15, n.º 3 (25 de janeiro de 2022): 855. http://dx.doi.org/10.3390/en15030855.

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There are many gaseous substances that need to be monitored for possible damage to health or the environment. This requires many sensors. The solution to reducing the number of sensors is to use one sensor to detect several gaseous substances simultaneously. Efforts to simplify sensor systems thus lead to the use of a sensor with a suitable sensitive layer and to finding a suitable method of detecting individual gaseous substances within one sensor. The aim is to find a suitable method to detect various gaseous substances acting on the sensor. For this purpose, modified impedance spectroscopy in the high-frequency range is applied, where the scattering parameters of the sensor based on carbon nanotubes are measured under the action of NO2 and NH3 gases. For this method of detection of gaseous substances, a suitable sensor platform structure was designed to enable the measurement of the electrical properties of the sensor in the GHz range. Based on the obtained results, it is possible to use one sensor to detect different types of gaseous substances.

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10

Mautz, Karl E., Michael L. Parsons e Carleton B. Moore. "Application of a Gas Sampling Introduction System for Inductively Coupled Plasma Spectroscopy and Analyses of Various Plasma Gases". Applied Spectroscopy 41, n.º 2 (fevereiro de 1987): 219–26. http://dx.doi.org/10.1366/000370287774987001.

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An inductively coupled plasma spectrometer was modified for gaseous sample introduction. The system uses a gas proportioner utilizing rotameters to achieve sample gas concentrations and mixing with the sample argon gas. Modifications of instruments were performed to enhance stability and compatability of gaseous sample introduction. Instrument performance was characterized for optimization of spectral signals produced from plasma gases. Spectral analyses of gaseous samples including CF4, SF6, O2, N2, air, and mixtures of CF4-O2 and CF4-O2/N2 were performed. Identification of plasma gas and plasma-induced byproducts, both atomic and molecular, were determined.

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11

Копылов, Павел Сергеевич. "Fire extinguishing efficiency of perfluoro-isohexenes". Pozharnaia bezopasnost`, n.º 1(102) (24 de março de 2021): 47–53. http://dx.doi.org/10.37657/vniipo.pb.2021.67.54.005.

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Показана нехватка современных веществ для газового пожаротушения, вызванная борьбой с глобальным потеплением. Описаны подходы к поиску перспективных газовых огнетушащих веществ (ГОТВ), применявшиеся ранее. Предложен новый подход и найдены с его помощью принципиально новые огнетушащие вещества, полностью удовлетворяющие современным экологическим и токсикологическим требованиям. The paper is devoted to investigation of perfluoro-isohexenes as new gaseous fire suppressants. The current situation in the field of fire protection with chemically active gases is analyzed. The problem of greenhouse gases replacement during fire suppression is discussed. The disadvantage of existing alternative agents is short atmospheric lifetime. It is also shown that the existing approach to development of new gaseous fire extinguishing substances is almost exhausted. New group of gaseous agents for fire suppression - perfluoro-isohexenes - is proposed based on new approach. These substances are non-toxic and have very short atmospheric lifetime. Two types of experimental equipment were used in this work to investigate properties of aforesaid substances as extinguishing agents. It was implemented to determine flammability limits of gaseous mixtures and fire extinguishing concentration of gaseous fire suppressants having high boiling point. It was shown that perfluoro-isohexenes are non-flammable and their extinguishing properties are substantially better than properties of the nearest equivalent - perfuoroethyl-isopropylketone. These results are discussed from the point of view of the features of transformation of considered fire extinguishing substances in a flame.

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12

Wang, XiaoWei, GuoBiao Cai, YuShan Gao, HongFa Huo e Vigor Yang. "High flowrate injector with gaseous hydrogen and gaseous oxygen". Science China Technological Sciences 54, n.º 11 (6 de agosto de 2011): 2958–73. http://dx.doi.org/10.1007/s11431-011-4538-2.

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13

Pittas, Nicholas, Dionissios Margaris, Demos Georgiou e Theodoula Grapsa. "INVESTIGATION THE EFFECT OF THE PERCENT COMPOSITION OF EXHAUST GASES FROM A COMBUSTION CHAMBER OF A THREEBED REGENERATIVE THERMAL OXIDIZER IN THE HEAT RADIATION EXCHANGE DEVELOPED DURING COMBUSTION, THAT NEUTRALIZES GASEOUS POLLUTANTS FOR A GIVEN PLANT CA". International Journal of Engineering Technologies and Management Research 5, n.º 10 (23 de março de 2020): 123–36. http://dx.doi.org/10.29121/ijetmr.v5.i10.2018.308.

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The purpose of this paper is to study the influence of the composition of the flue gases on the thermal radiation inside the combustion chamber of a three-stage regenerative oxidizer that neutralizes gaseous pollutants for a given plant capacity. This composition is expressed by the corresponding partial pressure of each constituent gas. It is assumed that the flue gases are gray and obey Lambert’s law, so that the gas mixture is assumed to be composed of water vapor and carbon dioxide plus a neutral one. Accurate estimates of each gaseous component emissivity were calculated from the experimental data charts provided by H. Hottel by employing regression analysis. The total emissivity coefficients of the gaseous mixture are evaluated with the help of the above emissivities and they are incorporated into the energy conservation equation that relates the heat exchange among the chamber walls.

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14

Colvile, R. F. "Gaseous Emission Monitoring". Measurement and Control 18, n.º 2 (março de 1985): 49–54. http://dx.doi.org/10.1177/002029408501800202.

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15

Nakanishi, K. "New Gaseous Insulation". IEEE Transactions on Electrical Insulation EI-21, n.º 6 (dezembro de 1986): 933–37. http://dx.doi.org/10.1109/tei.1986.349005.

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16

Franco, José, William Henney, Marco Martos e Miriam Peña. "Ionized Gaseous Nebulae". Publications of the Astronomical Society of the Pacific 113, n.º 784 (junho de 2001): 770–71. http://dx.doi.org/10.1086/320807.

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17

Putman, M. E., J. E. G. Peek e M. R. Joung. "Gaseous Galaxy Halos". Annual Review of Astronomy and Astrophysics 50, n.º 1 (22 de setembro de 2012): 491–529. http://dx.doi.org/10.1146/annurev-astro-081811-125612.

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18

Kosters, Michael, Anshu Giri, Naveen Gnanabakthan e Ibrahim Katerji. "A Gaseous Debate". Chest 148, n.º 4 (outubro de 2015): 518A. http://dx.doi.org/10.1378/chest.2254362.

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19

Rodionov, I., T. Francke, V. Peskov e T. Sokolova. "Hybrid gaseous photomultipliers". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 478, n.º 1-2 (fevereiro de 2002): 384–90. http://dx.doi.org/10.1016/s0168-9002(01)01778-8.

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20

Koffeman, E. N. "Gossip: Gaseous pixels". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 582, n.º 3 (dezembro de 2007): 858–60. http://dx.doi.org/10.1016/j.nima.2007.10.006.

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21

Szuromi, P. D. "CHEMISTRY: Gaseous Dihydrides". Science 308, n.º 5729 (17 de junho de 2005): 1717a. http://dx.doi.org/10.1126/science.308.5729.1717a.

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22

Lopatin, S. I., S. M. Shugurov e A. B. Nikolskii. "Gaseous complex sulfides". Russian Journal of General Chemistry 86, n.º 5 (maio de 2016): 1191–92. http://dx.doi.org/10.1134/s1070363216050340.

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23

Schmidt, Edward M., e George D. Kahl. "Gaseous blast reducer". Journal of the Acoustical Society of America 77, n.º 6 (junho de 1985): 2206. http://dx.doi.org/10.1121/1.391681.

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24

Molkov, V. V., A. V. Grigorash, R. M. Eber e D. V. Makarov. "Vented gaseous deflagrations". Journal of Hazardous Materials 116, n.º 1-2 (dezembro de 2004): 1–10. http://dx.doi.org/10.1016/j.jhazmat.2004.08.027.

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25

Věžníková, Hana, Michaela Perďochová e Martina Uhrová. "Assessment of the Moisture Effect on Gaseous Products of Self-Heating of Wood Chips". TRANSACTIONS of the VŠB – Technical University of Ostrava, Safety Engineering Series 12, n.º 2 (1 de setembro de 2017): 52–60. http://dx.doi.org/10.1515/tvsbses-2017-0014.

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Abstract Biofuels are stored in large quantities and may be susceptible to self-ignition. The possible methods of indication of temperature increase include the analysis of the gaseous products of heating where concentrations of certain gases may increase with increasing temperature. Gas release is also affected by the moisture of the material given that the moisture level changes surface accessibility for oxygen on the one side and serves as a catalyst of the oxidation reactions on the other. The present project analysed the effect of temperature and moisture on gaseous products of heating of wood chips, one of frequently used biofuels, with the aim to determine a suitable gaseous indicator of beginning self-ignition.

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26

Hirota, Koichi. "Applications of Electron Beam to Environmental Conservation". Nuclear Science and Technology 9, n.º 3 (15 de setembro de 2019): 38–41. http://dx.doi.org/10.53747/jnst.v9i3.43.

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The treatment of electron beam was tested for gaseous pollutants of volatile organiccompounds (VOCs), dioxin, and inorganic oxides (NOX and SOX). The representative VOCs of xylene and toluene were oxidized completely with electron beams using prototype hybrid system equipped with electron accelerator and MnO2 catalysts. More than 90% of dioxin in municipal solid waste incinerator gases was decomposed at a dose of 14 kGy. Nitrogen oxides and sulfur oxides in coal-fired flue gases were recovered as a fertilizer by the addition of NH3 under electron-beam irradiation.Electron beam is expected to be a promising method for treating gaseous pollutants.

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27

Popovic, Marko. "Equation of state in form which relates mol fraction and molarity of two (or more) component thermodynamic system consisted of ideal gases, and it’s applications". Thermal Science 14, n.º 3 (2010): 859–63. http://dx.doi.org/10.2298/tsci100325009p.

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Most people would face a problem if there is a need to calculate the mole fraction of a substance A in a gaseous solution (a thermodynamic system containing two or more ideal gases) knowing its molarity at a given temperature and pressure. For most it would take a lot of time and calculations to find the answer, especially because the quantities of other substances in the system aren?t given. An even greater problem arises when we try to understand how special relativity affects gaseous systems, especially solutions and systems in equilibrium. In this paper formulas are suggested that greatly shorten the process of conversion from molarity to mole fraction and give us a better insight into the relativistic effects on a gaseous system.

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Roskosz, Stanisław. "Quantitative Characterization of Shrinkage and Gas Pores in Turbine Blades Made of MAR M247 and IN 713C Superalloys". Solid State Phenomena 197 (fevereiro de 2013): 64–69. http://dx.doi.org/10.4028/www.scientific.net/ssp.197.64.

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The subject matter of the paper is the quantitative evaluation of gaseous and shrinkage porosity in construction elements of a low-pressure aircraft engine turbine using quantitative metallography methods. The research material comprised blades and blade segments with a polycrystalline structure made of IN 713C and MAR M247 superalloys. One of the major problems that occur in the precision castings is their porosity: gaseous, which is the result of emission of dissolved gases from the superalloy during solidification, and shrinkage, being the result of shrinkage of the superalloy and of insufficient feeding of the interdendritic space. The developed practical procedure of selective measurement of gaseous and shrinkage porosity enabling the examination of precision castings made of high-temperature creep resisting nickel superalloys is presented.

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Joo, Hung-Soo, Sang-Woo Han, Jin-Seok Han e Pius M. Ndegwa. "Emission Characteristics of Fine Particles in Relation to Precursor Gases in Agricultural Emission Sources: A Case Study of Dairy Barns". Atmosphere 14, n.º 1 (12 de janeiro de 2023): 171. http://dx.doi.org/10.3390/atmos14010171.

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Recently, precursor gases such as ammonia have sparked a growing interest in the secondary formation of particulate matter (PM). Most studies focus on urban areas and scientific data. Studies on precursor gases and PM emitted from agricultural sources are insufficient; thus, this paper presents a field monitoring study conducted from agricultural sources. To estimate the effect of precursor gases for PM2.5 from naturally ventilated dairy barns, correlation analyses were conducted using real-time monitoring data on the mass concentrations of PM2.5, NH3, SO2, NO2, and H2S and meteorological data. In addition to mass concentration, the emission and loading rates were used to closely analyze pollution status. The mass concentrations of PM2.5 and gaseous compounds did not correlate well, whereas the mass emission rates for PM2.5 and gaseous compounds (SO2, NH3, and NO2) correlated well because the unit of the emission rate reflected the ventilation factor. The correlation coefficients between PM2.5 and precursor gas emission rates ranged from 0.72 to 0.89 (R), with the SO2 emission rate exhibiting the highest correlation coefficient (R = 0.89). This correlation implies that SO2 from dairy farms is a dominant species among the gaseous precursors influencing the secondary formation of PM2.5; alternatively, SO2 and PM2.5 are produced from the same sources. The ambient PM2.5 loading rate and barn PM2.5 emission rate—estimated by multivariate linear regression using the gaseous independent variables NH3, SO2, and NO2—revealed high-correlation coefficients (0.60 and 0.92, respectively) with the measured data. At present, most studies investigating the precursor gases of PM in agricultural fields have focused on NH3; however, this study suggests that SO2 is a key factor in PM2.5 pollution. To elucidate the secondary formation of PM from precursor gases in agricultural sources, particulate ammonium, sulfate, nitrate, and chloride, which were not measured in this study, as well as oxidants and intermediates, should be considered in future research.

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STELMASIAK, Zdzisław. "Analysis of the influence of gas-air mixture property on the selected parameters dual fuel direct injection diesel engine". Combustion Engines 121, n.º 2 (1 de maio de 2005): 30–45. http://dx.doi.org/10.19206/ce-117404.

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Perspectives of usage natural gas in feeding systems of internal combustion engines and development of electronic control systems have resulted in survived interest in dual fuel system of engine feeding. Compression ignition, dual fuel engine enables to preserve majority of positive features of compression ignition engine and shows many advantageous features comparing with gaseous engine with spark ignition system. The paper shows an impact of gaseous mixture composition on operational parameters of the engine, with special consideration of combustion parameters and toxicity of exhaust gases. It has been confirmed that in range of gaseous mixture composition change in scope of λo = 1.4–6.0 worsening of combustion parameters is negligible and can be accepted for medium size traditional engines. Simultaneously, in spite of implementation of traditional injection system, leaning of the mixture up to λo < 6.0 enables significant change of engine load. Limitation of leaning of the mixture up to λo < 4.5, restricts harmful phenomena connected with combustion of lean gaseous mixtures. It requires, however, fuel injection electronic systems such as common rail. Results presented in the paper can be useful in adaptations of compression ignition engine to gaseous feeding and in stage of development of control systems to such engines.

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31

Gracz, Weronika, Damian Marcinkowski, Wojciech Golimowski, Filip Szwajca, Maria Strzelczyk, Jacek Wasilewski e Paweł Krzaczek. "Multifaceted Comparison Efficiency and Emission Characteristics of Multi-Fuel Power Generator Fueled by Different Fuels and Biofuels". Energies 14, n.º 12 (8 de junho de 2021): 3388. http://dx.doi.org/10.3390/en14123388.

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The negative effect of liquid and gaseous fuel combustion is toxic gases (i.e., carbon and nitrogen oxides NOx) and particulate matter (PM) formation. The content of harmful and toxic components of exhaust gases is strongly dependent on the quality and type of burnt fuel. Experimental research is required to verify the use of current technical and technological solutions for the production of electricity on farms, using various types of conventional fuels and biofuels. The aim of the current research was to comprehensively verify the use of commonly available fuels and biofuels without adapting the internal combustion engine. Gaseous fuels—propane-butane mixture (LPG), compressed natural gas (CNG) and biogas (BG)—were added to liquid fuels—methyl esters of higher fatty acids (RME) and diesel fuel (DF)—in six different power configurations to evaluate the effect on the emission of toxic gases: carbon monoxide (CO), nitric oxide (NO), nitric dioxide (NO2) and particulate matter (PM), and the efficiency of fuel conversion. The use of RME in various configurations with gaseous fuels increased the emission of oxides and reduced the emission of PM. Increasing the share of LPG and CNG significantly increased the level of NO emissions. The use of gaseous fuels reduced the efficiency of the generator, particularly in the case of co-firing with DF. For medium and high loads, the lowest decrease in efficiency was recorded for the RME configuration with BG. Taking into account the compromise between individual emissions and the configuration of RME with BG, the most advantageous approach is to use it in power generators.

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Firouzi, Amin, Shafreeza Sobri, Faizah Mohd Yasin e Fakhru'l Razi Ahmadun. "The Effect of CH₄ and CO₂ Exposure on Carbon Nanotubes Electrical Resistance". Advanced Materials Research 214 (fevereiro de 2011): 655–61. http://dx.doi.org/10.4028/www.scientific.net/amr.214.655.

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This research was carried out to monitor and investigate the gas sensing effects on carbon nanotubes (CNTs) by a systematic study of the variations in the electrical resistance as sensor signal induced by adsorption of CO2 and CH4 gaseous molecules. The CNTs were synthesized by Floating Catalyst Chemical Vapor Deposition (FC-CVD) method on quartz substrate under benzene bubble at temperature of 700°C. Then, they were tested for gas sensing applications operating at room temperature. Upon exposure to gaseous molecules, the electrical resistance of CNTs dramatically increased for both CO2 and CH4 gases with short response time and high sensitivity. It was also observed that the CNTs device behaves as a p-type semiconductor when exposed to gaseous molecules. In addition, the recovery of the sensors and mechanism of gas sensing procedure are discussed.

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Barbin, N. M., A. M. Kobelev, D. I. Terent’ev e S. A. Titov. "Composition of the gas-plasma phase in the radioactive graphite - water vapor system". Journal of Physics: Conference Series 2150, n.º 1 (1 de janeiro de 2022): 012026. http://dx.doi.org/10.1088/1742-6596/2150/1/012026.

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Abstract In this work, the composition and thermophysical properties of the “Reactor graphite-H2O” system at temperatures from 2123 to 3223 K are calculated. It was found that the main components of the vapor phase at a temperature of 2123-2923 K: carbon dioxide, carbon monoxide, water vapor, hydroxide, hydrogen, atomic hydrogen. At temperatures above 3223 K, oxygen and atomic oxygen are added to the gases present. The balances of uranium and plutonium are considered. Uranium at temperatures above 2123 K is present in the system in the form of gaseous and ionized uranium dioxide and trioxide. Plutonium at temperatures above 2123 K is present in the system in the form of gaseous and ionized plutonium oxide, gaseous plutonium dioxide. The calculation of thermophysical properties for the considered system is carried out.

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Christophorou, Loucas G., e James K. Olthoff. "Conference Report: Gaseous Dielectrics VIII (Eighth International Symposium on Gaseous Dielectrics)". Journal of Research of the National Institute of Standards and Technology 103, n.º 5 (novembro de 1998): 517. http://dx.doi.org/10.6028/jres.103.032.

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Więcław, Dariusz, Krzysztof Jurek, Monika J. Fabiańska, Elżbieta Bilkiewicz, Adam Kowalski, Magdalena Misz-Kennan e Justyna Ciesielczuk. "Molecular and Stable Isotope Composition of Pollutants Emitted during Thermal Processes within the Rymer Coal Waste Dump (Upper Silesia, Poland)". Minerals 11, n.º 10 (13 de outubro de 2021): 1120. http://dx.doi.org/10.3390/min11101120.

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Twenty-seven gases and sixteen rock wastes from the thermal active Rymer coal waste dump were collected. The composition and origin of gaseous, liquid, and solid pollutants emitted during the self-heating process and the development of these processes with time were established. Gases were subjected to determination of molecular and stable isotope (δ13C and δ2H) composition. Rock-Eval pyrolysis and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) were applied for evaluation of the quantity and molecular composition of pyrolysates released during the heating of rocks in temperatures from 100 to 650 °C. The main products of Py-GC-MS are released between 350 and 650 °C, namely alkanes, aromatic hydrocarbons, and aromatic alcohols. These components were also recorded in Py-GC-MS products of samples collected from the dump surface. Besides the high-molecular-weight organic compounds, in emitted gases CO2, CO, gaseous hydrocarbons, and S-compounds were recorded. The stable isotope data indicated that methane was generated mainly during the low-temperature thermogenic process, but a share of the microbial-originated gas was visible. The source of the CO2 was the oxidation of organic matter. The gaseous S-compounds were products of high-temperature decomposition of sulphides and organic S-compounds. The hydrocarbon and CO contents of the emitted gases proved to be good indicators for tracking of the self-heating processes.

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See Leang Chin, See Leang Chin, Huailiang Xu Huailiang Xu, Ya Cheng Ya Cheng, Zhizhan Xu Zhizhan Xu e Kaoru Yamanouchi Kaoru Yamanouchi. "Natural population inversion in a gaseous molecular filament". Chinese Optics Letters 11, n.º 1 (2013): 013201–13203. http://dx.doi.org/10.3788/col201311.013201.

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Chen, Baitong, Jacek A. Koziel, Chumki Banik, Hantian Ma, Myeongseong Lee, Jisoo Wi, Zhanibek Meiirkhanuly, Daniel S. Andersen, Andrzej Białowiec e David B. Parker. "Emissions from Swine Manure Treated with Current Products for Mitigation of Odors and Reduction of NH3, H2S, VOC, and GHG Emissions". Data 5, n.º 2 (18 de junho de 2020): 54. http://dx.doi.org/10.3390/data5020054.

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Odor and gaseous emissions from the swine industry are of concern for the wellbeing of humans and livestock. Additives applied to the swine manure surface are popular, marketed products to solve this problem and relatively inexpensive and easy for farmers to use. There is no scientific data evaluating the effectiveness of many of these products. We evaluated 12 manure additive products that are currently being marketed on their effectiveness in mitigating odor and gaseous emissions from swine manure. We used a pilot-scale system simulating the storage of swine manure with a controlled ventilation of headspace and periodic addition of manure. This dataset contains measured concentrations and estimated emissions of target gases in manure headspace above treated and untreated swine manure. These include ammonia (NH3), hydrogen sulfide (H2S), greenhouse gases (CO2, CH4, and N2O), volatile organic compounds (VOC), and odor. The experiment to test each manure additive product lasted for two months; the measurements of NH3 and H2S were completed twice a week; others were conducted weekly. The manure for each test was collected from three different farms in central Iowa to provide the necessary variety in stored swine manure properties. This dataset is useful for further analyses of gaseous emissions from swine manure under simulated storage conditions and for performance comparison of marketed products for the mitigation of gaseous emissions. Ultimately, swine farmers, the regulatory community, and the public need to have scientific data informing decisions about the usefulness of manure additives.

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Cortesi, Marco, Wolfgang Mittig, Daniel Bazin, Yassid Ayyad Limonge, Saul Beceiro-Novo, Rim Soussi Tanani, Michael Wolff, John Yurkon e Andreas Stolz. "Recent advances with a hybrid micro-pattern gas detector operated in low pressure H2 and He, for AT-TPC applications". EPJ Web of Conferences 174 (2018): 01007. http://dx.doi.org/10.1051/epjconf/201817401007.

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In view of a possible application as a charge-particle track readout for an Active-Target Time Projection Chamber (AT-TPC), the operational properties and performances of a hybrid Micro-Pattern Gaseous Detector (MPGD) were investigated in pure low-pressure Hydrogen (H2) and Helium (He). The detector consists of a MICROMEsh GAseous Structure (MICROMEGAS) coupled to a two-cascade THick Gaseous Electron Multiplier (THGEM) as a pre-amplification stage. This study reports the effective gain dependence of the hybrid-MPGD at relevant pressure (in the range of 200-760 torr) for different detector arrangements. The results of this work are relevant in the field of avalanche mechanism in low-pressure, low-mass noble gases, in particularly for applications of MPGD end-cap readout for active-target Time Projection Chambers (TPC) in the field of nuclear physics and nuclear astrophysics.

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Januszewicz, Katarzyna, Marek Klein e Ewa Klugmann-Radziemska. "Gaseous Products from Scrap Tires Pyrolisis". Ecological Chemistry and Engineering S 19, n.º 3 (1 de janeiro de 2012): 451–60. http://dx.doi.org/10.2478/v10216-011-0035-6.

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Gaseous Products from Scrap Tires Pyrolisis In European Union 75% of used tires should be recycled. The most common method of used tires disposal, is burning in cement kilns, which does not solve the problem. Pyrolysis process can be an alternative way of utilization of tires. The aim of the researches was to check the influence of pyrolysis products (gas and oil fractions) on environment. Samples from pyrolysis process, like light oil fractions or pyrolysis gases were analyzed using gas chromatography. The pyrolysis installation should be hermetical, because of the PAHs which were detected in a light fraction of oil. In exhaust gases BTEX and PAHs were not detected.

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Buczek, Bronisław. "Methane Recovery from Gaseous Mixtures Using Carbonaceous Adsorbents". Archives of Mining Sciences 61, n.º 2 (1 de junho de 2016): 285–92. http://dx.doi.org/10.1515/amsc-2016-0021.

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Abstract Methane recovery from gaseous mixtures has both economical and ecological aspect. Methane from different waste gases like mine gases, nitrogenated natural gases and biogases can be treated as local source for production electric and heat energy. Also occurs the problem of atmosphere pollution with methane that shows over 20 times more harmful environmental effect in comparison to carbon dioxide. One of the ways utilisation such gases is enrichment of methane in the PSA technique, which requires appropriate adsorbents. Active carbons and carbon molecular sieve produced by industry and obtained in laboratory scale were examined as adsorbent for methane recuperation. Porous structure of adsorbents was investigated using densimetry measurements and adsorption of argon at 77.5K. On the basis of adsorption data, the Dubinin-Radushkevich equation parameters, micropore volume (Wo) and characteristics of energy adsorption (Eo) as well as area micropores (Smi) and BET area (SBET) were determined. The usability of adsorbents in enrichment of the methane was evaluated in the test, which simulate the basic stages of PSA process: a) adsorbent degassing, b) pressure raise in column by feed gas, c) cocurrent desorption with analysis of out flowing gas. The composition of gas phase was accepted as the criterion of the suitability of adsorbent for methane separation from gaseous mixtures. The relationship between methane recovery from gas mixture and texture parameters of adsorbents was found.

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Kraft, Ya V., A. B. Aduev, N. V. Nelyubina, V. D. Volkov e Z. R. Ismagilov. "Pyrolysis of High Volatile C Bituminous Coal under the Action of Nanosecond Laser Radiation". Eurasian Chemico-Technological Journal 24, n.º 3 (10 de outubro de 2022): 173–81. http://dx.doi.org/10.18321/ectj1430.

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The effect of pulsed nanosecond laser radiation (wavelength 532 nm, pulse duration 14 ns, pulse repetition frequency 6 Hz, the density of laser radiation power 0.2–0.6 J/cm2) on the tableted samples of high volatile C bituminous coal in argon medium is investigated. Among the gaseous products of pyrolysis, H2, CH4, C2H2, CO and CO2 are detected. The volume fractions of gaseous products from sample pyrolysis depending on the laser radiation power density is established. Within the laser radiation power density range 0.2–0.4 J/cm2, the volume of the formed combustible gases per unit mass of the reacted sample increases, and remains almost unchanged with further increase in power density. The volume fraction of combustible gases in the mixture of gaseous pyrolysis products are only slightly dependent on the laser radiation power density. The action of nanosecond laser radiation with a power density of more than 0.4 J/cm2 causes intense ablation of the tableted sample containing 0.005 wt.%. polyvinyl alcohol. A tableted sample containing no binding material is destroyed under the action of nanosecond laser radiation with a power density of more than 0.2 J/cm2.

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Mizushima, Ichiro, e Hitoshi Habuka. "Behavior of Viscous Liquid Byproduct Formed in Exhaust Tube by Silicon Carbide Epitaxial Growth". ECS Journal of Solid State Science and Technology 8, n.º 12 (1 de janeiro de 2019): P805—P810. http://dx.doi.org/10.1149/2.0241912jss.

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The behavior of the by-product produced in an exhaust tube by the semiconductor silicon carbide epitaxial growth process was evaluated. The by-product layer was a dark-colored viscous liquid; it captured precursor gases and gaseous by-products, such as hydrogen, monosilane, propane, hydrogen chloride and chlorosilanes. These captured gases were spontaneously emitted in ambient nitrogen at room temperature. By an etching process using a chlorine trifluoride gas at low concentrations in ambient nitrogen, the by-product layer could be safely decomposed to gaseous fluorides of silicon and carbon. After finishing the etching, there remained a small amount of residue which included particles of carbon, silicon carbide and related compounds. Based on these results, the by-product layer formation process was discussed.

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Starikova, Ye G., N. V. Ryazantseva, V. V. Novitsky, L. A. Tashireva, Yu V. Starikov, Ye A. Stepovaya, I. A. Osikhov, O. A. Vasiliyeva e Y. D. Yakushina. "The role of intracellular gaseous transmitters hydrogen sulfide and nitric oxide in apoptosis regulation of normal and cancer cells". Bulletin of Siberian Medicine 10, n.º 6 (28 de dezembro de 2011): 40–44. http://dx.doi.org/10.20538/1682-0363-2011-6-40-44.

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Investigation of influence of gases nitric oxide and hydrogen sulfide on apoptotic cell death of Jurlat cells and mononuclear leucocytes of healthy donors was conducted. It was shown that 100 mmol sodium nitroprussidi increased the apoptosis of T lymphoblast leukemia cells after 15’ incubation. 10 and 100 mmol donor of hydrogen sulfide caused apoptotic death of Jurkat cells after 15’ incubation. 15’ exposure of nitric oxide and hydrogen sulfide donors did not lead to the changes of cell death of mononuclear leucocytes. Gaseous transmitters NO and H2S increased necrosis of Jurkat cells and mononuclear leucocytes after 24 h incubation with the appropriate gase’s donor.

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SAWAE, Yoshinori, e Joich SUGIMURA. "Tribology in Gaseous Hydrogen". Journal of the Vacuum Society of Japan 53, n.º 4 (2010): 280–87. http://dx.doi.org/10.3131/jvsj2.53.280.

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FUJIOKA, Tomoo. "Gaseous laser 30 years." Review of Laser Engineering 19, n.º 1 (1991): 10–12. http://dx.doi.org/10.2184/lsj.19.10.

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Diaz, Nils J. "Preface: Gaseous Core Reactors". Nuclear Technology 69, n.º 2 (maio de 1985): 129–33. http://dx.doi.org/10.13182/nt85-a33624.

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KING, J. A., e K. A. SMITH. "Gaseous diffusion through peat". Journal of Soil Science 38, n.º 2 (junho de 1987): 173–77. http://dx.doi.org/10.1111/j.1365-2389.1987.tb02134.x.

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Wang, Xiaopo, Jiangtao Wu e Zhigang Liu. "Viscosity of Gaseous HFC245fa". Journal of Chemical & Engineering Data 55, n.º 1 (14 de janeiro de 2010): 496–99. http://dx.doi.org/10.1021/je900279z.

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Szidarovszky, Tamás, Gábor Czakó e Attila G. Császár. "Conformers of gaseous threonine". Molecular Physics 107, n.º 8-12 (20 de abril de 2009): 761–75. http://dx.doi.org/10.1080/00268970802616350.

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Combes, Francoise. "Gaseous flows in galaxies". Proceedings of the International Astronomical Union 3, S245 (julho de 2007): 151–60. http://dx.doi.org/10.1017/s1743921308017535.

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AbstractThe gas component plays a major role in the dynamics of spiral galaxies, because of its dissipative character, and its ability to exchange angular momentum with stars in the disk. Due to its small velocity dispersion, it triggers gravitational instabilities, and the corresponding non-axisymmetric patterns produce gravity torques, which mediate these angular momentum exchanges. When a srong bar pattern develops with the same pattern speed all over the disk, only gas inside corotation can flow towards the center. But strong bars are not long lived in presence of gas, and multiple-speed spiral patterns can develop between bar phases, and help the galaxy to accrete external gas flowing from cosmic filaments. The gas is then intermittently driven to the galaxy center, to form nuclear starbursts and fuel an active nucleus. The various time-scales of these gaseous flows are described.

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