Relevant bibliographies by topics / Cubic air

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Cubic air'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Cubic air"

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Yang, Joshua S. "The Anti-Chinese Cubic Air Ordinance." American Journal of Public Health 99, no. 3 (2009): 440. http://dx.doi.org/10.2105/ajph.2008.145813.

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Quintero, Michael A., Shiqiang Hao, Sawankumar V. Patel, et al. "Lithium Thiostannate Spinels: Air-Stable Cubic Semiconductors." Chemistry of Materials 33, no. 6 (2021): 2080–89. http://dx.doi.org/10.1021/acs.chemmater.0c04651.

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Hansen, A. B., J. Brandt, J. H. Christensen, and E. Kaas. "Semi-Lagrangian methods in air pollution models." Geoscientific Model Development 4, no. 2 (2011): 511–41. http://dx.doi.org/10.5194/gmd-4-511-2011.

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Abstract. Various semi-Lagrangian methods are tested with respect to advection in air pollution modeling. The aim is to find a method fulfilling as many of the desirable properties by Rasch andWilliamson (1990) and Machenhauer et al. (2008) as possible. The focus in this study is on accuracy and local mass conservation. The methods tested are, first, classical semi-Lagrangian cubic interpolation, see e.g. Durran (1999), second, semi-Lagrangian cubic cascade interpolation, by Nair et al. (2002), third, semi-Lagrangian cubic interpolation with the modified interpolation weights, Locally Mass Conserving Semi-Lagrangian (LMCSL), by Kaas (2008), and last, semi-Lagrangian cubic interpolation with a locally mass conserving monotonic filter by Kaas and Nielsen (2010). Semi-Lagrangian (SL) interpolation is a classical method for atmospheric modeling, cascade interpolation is more efficient computationally, modified interpolation weights assure mass conservation and the locally mass conserving monotonic filter imposes monotonicity. All schemes are tested with advection alone or with advection and chemistry together under both typical rural and urban conditions using different temporal and spatial resolution. The methods are compared with a current state-of-the-art scheme, Accurate Space Derivatives (ASD), see Frohn et al. (2002), presently used at the National Environmental Research Institute (NERI) in Denmark. To enable a consistent comparison only non-divergent flow configurations are tested. The test cases are based either on the traditional slotted cylinder or the rotating cone, where the schemes' ability to model both steep gradients and slopes are challenged. The tests showed that the locally mass conserving monotonic filter improved the results significantly for some of the test cases, however, not for all. It was found that the semi-Lagrangian schemes, in almost every case, were not able to outperform the current ASD scheme used in DEHM with respect to accuracy.
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Hansen, A. B., J. Brandt, J. H. Christensen, and E. Kaas. "Semi-Lagrangian methods in air pollution models." Geoscientific Model Development Discussions 3, no. 4 (2010): 2361–438. http://dx.doi.org/10.5194/gmdd-3-2361-2010.

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Abstract. Various semi-Lagrangian methods are tested with respect to advection in air pollution modeling. The aim is to find a method fulfilling as many of the desirable properties by Rasch and Williamson (1990) and Machenhauer et al. (2008) as possible. The focus in this study is on accuracy and local mass conservation. The methods tested are, first, classical semi-Lagrangian cubic interpolation, see e.g. Durran (1999), second, semi-Lagrangian cubic cascade interpolation, by Nair et al. (2002), third, semi-Lagrangian cubic interpolation with the modified interpolation weights, Locally Mass Conserving Semi-Lagrangian (LMCSL), by Kaas (2008), and last, semi-Lagrangian cubic interpolation with a locally mass conserving monotonic filter byKaas and Nielsen (2009). Semi-Lagrangian (SL) interpolation is a classical method for atmospheric modeling, cascade interpolation is more efficient computationally, modified interpolation weights assure mass conservation and the locally mass conserving monotonic filter imposes monotonicity. All schemes are tested with advection alone or with advection and chemistry together under both typical rural and urban conditions using different temporal and spatial resolution. The methods are compared with a current state-of-the-art scheme, Accurate Space Derivatives (ASD), see Frohn et al. (2002), presently used at the National Environmental Research Institute (NERI) in Denmark. To enable a consistent comparison only non-divergent flow configurations are tested. The test cases are based either on the traditional slotted cylinder or the rotating cone, where the schemes' ability to model both steep gradients and slopes are challenged. The tests showed that the locally mass conserving monotonic filter improved the results significantly for some of the test cases, however, not for all. It was found that the semi-Lagrangian schemes, in almost every case, were not able to outperform the current ASD scheme used in DEHM with respect to accuracy.
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Hwang, Bing-Joe, and Ljalem Hadush Abrha. "(Invited) Cubic Garnet Solid Electrolyte with Superior Air Stability." ECS Meeting Abstracts MA2020-02, no. 2 (2020): 494. http://dx.doi.org/10.1149/ma2020-022494mtgabs.

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Kotobuki, Masashi, Binngong Yan, Li Lu, Emil Hanc, and Joanna Molenda. "Study on stabilization of cubic Li7La3Zr2O12 by Ge substitution in various atmospheres." Functional Materials Letters 09, no. 06 (2016): 1642005. http://dx.doi.org/10.1142/s1793604716420054.

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Stabilization of high Li ion conductive cubic Li7La3Zr2O[Formula: see text] (LLZ) by Ge substitution in air, N2/O2 and N2 atmospheres are studied by high temperature XRD (HT-XRD) of Ge-added tetragonal LLZ (Ge-LLZ). A formation of low temperature cubic phase caused by CO2 absorption during storage of the Ge-LLZ is observed at about 160[Formula: see text]C in all atmospheres. Additionally, impurity formation of La2Zr2O7 and La2O3 also occurs in all atmospheres. On the other hand, stabilization of cubic phase by substitution of Ge is largely influenced by the atmosphere. The cubic phase is observed at 40[Formula: see text]C after heating Ge-LLZ to 700[Formula: see text]C in air while only tetragonal phase appeared after heating in N2/O2. It is concluded that the heating atmosphere largely influences substitution of Ge, resulting in stabilization of the high Li ion conductive cubic phase.
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Langhammer, Jan, Martin Landrø, James Martin, and Eivind Berg. "Air‐gun bubble damping by a screen." GEOPHYSICS 60, no. 6 (1995): 1765–72. http://dx.doi.org/10.1190/1.1443910.

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A method for damping unwanted bubble oscillations from a seismic air gun is presented. The method exploits the fact that the primary pressure peak generated by an air gun is produced during the first 5–10 ms after firing. The air bubble is destroyed by mounting a perforated screen with an optimal radius about the gun. Once the primary pressure peak has been generated by the bubble, the bubble is destroyed by the screen, leading to a corresponding decrease in the measured pressure amplitude of the secondary bubble oscillations. Controlled near‐field measurements of 40‐cubic inch and 120‐cubic inch air guns with and without damping screens are used. The primary to bubble ratio improves from 1.4 without a screen to 4.4 with a screen in the near‐field. The corresponding values for estimated far‐field signatures are 1.8 to 9.0 when the signatures are filtered with an out‐128 Hz (72 dB/Oct) DFS V filter.
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Abrha, Ljalem Hadush, Tesfaye Teka Hagos, Yosef Nikodimos, et al. "Dual-Doped Cubic Garnet Solid Electrolytes with Superior Air Stability." ACS Applied Materials & Interfaces 12, no. 23 (2020): 25709–17. http://dx.doi.org/10.1021/acsami.0c01289.

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Kushwaha, M. S., B. Djafari-Rouhani, and L. Dobrzynski. "Sound isolation from cubic arrays of air bubbles in water." Physics Letters A 248, no. 2-4 (1998): 252–56. http://dx.doi.org/10.1016/s0375-9601(98)00640-9.

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Wanninkhof, Rik, and Wade R. McGillis. "A cubic relationship between air-sea CO2exchange and wind speed." Geophysical Research Letters 26, no. 13 (1999): 1889–92. http://dx.doi.org/10.1029/1999gl900363.

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Dissertations / Theses on the topic "Cubic air"

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Mallory, William, Rich Rivera, William Swinford, and BRB Consulting. "Improving Utilization of F/A-18 Simulator CUBIC Instructors at VFA-106, Naval Air Station Oceana, VA." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/7062.

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EMBA Project Report
EXECUTIVE SUMMARY: Strike Fighter Squadron ONE ZERO SIX (VFA-106), the only East Coast F/A-18 Fleet Replacement Squadron (FRS), has identified problems in Cubic Instructor (CI) capacity during periods of high demand as a result of combining series of aircraft, C/D and E/F, into larger “Super” classes. Subsequently, the squadron is forced to augment CIs with Instructor Pilots (IPs) or Instructor Weapons System Officers (IWSOs) to increase capacity or forego utilization of some of their 70 simulator hours allotted to them daily. A simulator process improvement study was undertaken to help VFA-106 address these issues, ultimately improving production and time-to-train. FINDINGS • The current CI contract is inefficient due to its inflexibility • Simply increasing CI manning is not a long-term solution • The current VFA-106 simulator scheduling construct is insufficient and lacks long-term vision RECOMMENDATIONS • Draft and utilize a more flexible CI contract • Institute simulator scheduling process improvements to provide more continuity and a long-term vision
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Steckler, Kathleen M. "Naval Air Station Cubi Point : a "Hot Turnover"? : a management case study /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA280039.

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Sales, Alan Rodrigo de [UNESP]. "Método da lubri-refrigeração de MQL, com a utilização do óleo solúvel sintético diluído em água, na retificação cilíndrica do aço ABNT 4340 com rebolo de CBN." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/148682.

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A aplicação da mínima quantidade de lubrificante (MQL) na usinagem dos metais começaram a ser estudados como alternativa para reduzir o uso dos fluidos de corte, para poder atingir uma produção mais limpa e menos prejudicial ao meio ambiente e aos trabalhadores, na retificação, apesar de ser considerada uma técnica inovadora no aspecto ambiental, sua aplicação é restrita devido à geração excessiva de calor e ao entupimento dos poros do rebolo causado pelos cavacos, e isto prejudica a qualidade final do produto e aumenta o desgaste da ferramenta. Esta pesquisa buscou aprimorar o uso do MQL utilizando óleo solúvel sintético da Quimatic Tapimatic ME-2. Além de usar o jato com a mistura ar e óleo e proporções de água injetado na interface rebolo-peça à alta velocidade um jato de ar comprimido, foi utilizado na superfície de corte do rebolo para minimizar o empastamento do rebolo gerado durante o processo de usinagem pela mistura formada pelo óleo do MQL mais os cavacos. Foram realizados ensaios na retificação cilíndrica externa de mergulho do aço ABNT 4340, temperado e revenido com dureza média de 54 HRC, usando rebolo de nitreto de boro cúbico (CBN) com ligante vitrificado. Os métodos de lubri-refrigeração propostos foram o convencional com fluido em abundância e o MQL (sem limpeza da superfície de corte do rebolo) e MQL (com a limpeza, utilizando o ângulo de incidência do ar comprimido na superfície de corte do rebolo fixo a 30 graus). Este ângulo foi escolhido por ser a melhor condição mostrada nos trabalhos de outros autores. Consideraram-se as variáveis de saída do processo: rugosidade, desgaste diametral do rebolo, circularidade, além de análises metalográficas e medições de microdureza da superfície retificada para verificação de danos térmicos; de forma a analisar a viabilidade da substituição do tradicional método de aplicação dos fluidos em abundância pelo MQL com a limpeza. Os resultados mostraram a possibilidade de implementação da técnica da limpeza do rebolo como um aprimoramento tecnológico da mínima quantidade de lubrificante na retificação, reduzindo o consumo dos fluidos de corte. A técnica MQL com limpeza para um ângulo específico de incidência do ar comprimido mostrou-se extremamente eficiente com a obtenção de melhor acabamento superficial e dimensional, além de menor desgaste da ferramenta abrasiva e isenção de danos térmicos, quando comparada com os métodos convencionais sem a limpeza do rebolo.
The application of minimum quantity of lubricant (MQL) on machining of metals has emerged as an alternative to reduce the abundance of cutting fluids and then achieve a cleaner production. In grinding, although considered a breakthrough technique in the environmental aspect, its application is restricted due to excessive generation of heat and grinding wheel loading caused by the chips, damaging the final product quality and increasing tool wear. The objective of this research was to improve the MQL technique synthetic soluble oil Quimatic Tapmatic ME-2 using beyond the jet with air mixture and oil and water proportions using an additional jet of compressed air to clean the clogged pores of the wheel. Grinding wheel in tests were performed in cylindrical plunge grinding of the ABNT 4340 steel, quenched and tempered (54 HRC), with a vitrified cubic boron nitride (CBN). The suggested methods of lubrication were conventional (abundant fluid), MQL (that without the use of air jet to cleaning the wheel) and MQL plus cleaning system using the angle of incidence of the compressed air on the cutting surface of the grinding wheel fixed to 30 degrees. Other autors chose This angle to be the best condition shown in the works. This performance was evaluated based on an analysis of the process output variables: roughness, diametric wear of the grinding, roundness, and metallographic analysis plus microhardness measurements of the grounded surface to verify thermal damage incidence. The results showed the possibility of implementing the technique of cleaning as a technological enhancement to minimum quantity of lubricant in the grinding, reducing the use of cutting fluids. The technique MQL plus cleaning system, in a specific incident angle of the compressed air was extremely efficient, resulting in better surface finish, reduced tool wear and free of thermal damage when compared with conventional methods without cleaning of the wheel.
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Olaleye, Peter Damilare. "Mortality investigation : does life table PA90 model annuitants mortality in Nigeria?" Master's thesis, Instituto Superior de Economia e Gestão, 2018. http://hdl.handle.net/10400.5/17306.

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Mestrado em Actuarial Science
Este estudo tem como objetivo investigar se a tábua PA90 do Reino Unido constitui um modelo aceitável para a experiência de mortalidade na Nigéria, no que diz respeito à população dos detentores de anuidades. A motivação para o trabalho provém do facto de o mercado nigeriano de anuidades se ter vindo a desenvolver nos últimos anos. Nesta dissertação apresenta-se uma revisão de alguma da literatura relevante sobre o tópico, incluindo algumas noções de base - o que é uma renda vitalícia - e descrições necessariamente breves da investigação sobre questões de mortalidade desenvolvida no Reino Unido e em África, bem como de algumas das razões pelas quais as taxas de mortalidade estão a ser continuamente objeto de estudo. Os dados e as metodologias indispensáveis à prossecução do objetivo são de seguida discutidos e aplicados. Destaque deve ser dado aos dois métodos de suavização utilizados, spline com base natural (NCS) e spline penalizada, que foram usados no training set data, para a obtenção de taxas de mortalidade alisadas. As taxas estimadas são posteriormente comparadas com a tábua PA90, para estudar se esta deve continuar a ser usada na Nigéria, ou se se impõe a realização de um estudo completo da mortalidade no país.
This study aims to investigate PA90 of the UK as a proxy for annuitant mortality table in Nigeria. Annuities seem to grow rapidly across the globe due to reformations and regulations in the public social security systems regarding post retirement plans. Nigerian annuity market is not left out in this global growth as annuity product now gains momentum by the day. The primary focus of this dissertation is to compare PA90 of the UK with crude rates estimated from the national data available, an important topic nowadays in Nigeria. A literature review is provided - what life annuity means, mortality investigations in UK and Africa, and some of the reasons why mortality rates are being assessed. Data and methodology required to accomplish the objective of the work developed are also thoroughly discussed and used. Two smoothing techniques, natural basis spline (NCS) and penalised spline were applied on the training set, to obtain smoothed mortality rates. The rates that have been estimated are then compared with the PA90 rates, to see whether this life table should continue to be used as a proxy for the mortality of Nigerian annuitants, or an independent study should be carried out.
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柯耀庭. "Experimental study of air convection in rotating inclined cubic enclosures and vertical diverging cylinders." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/63229135330335574248.

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Lee, Tzong-Long, and 李宗隆. "THE STUDY OF THREE DIMENTIONAL CONVECTION OF AIR INSIDE A ROTATING, INCLINED CUBIC CAVITY." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/96634450196720952843.

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Dasgupta, Titas. "Investigations Of Mechanical And Thermoelectric Properties Of Group (VIB) Transition Metal Disilicides." Thesis, 2007. http://hdl.handle.net/2005/611.

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Transition Metal (TM) silicides are potential materials for different high temperature applications due to their high melting points and chemical stability at elevated temperatures. In the present work, the possible use of Gr (VIB) disilicides: MoSi2 and CrSi2 for high temperature structural application and thermopower generation respectively are investigated. Literature reports on MoSi2 indicate this material to have excellent mechanical and thermal behaviors at temperatures greater than 1273 K. The major problems limiting its use are the low temperature brittleness and oxidation at intermediate temperatures and form the scope of this work. Also, CrSi2 is reported to be a narrow band gap semiconductor. Its feasibility as a thermoelectric material for power generation is investigated. The first chapter briefly summarizes the literature on MoSi2 and CrSi2 relevant to structural and thermoelectric applications respectively. Based on the available literature, the scope of further work is discussed. The second chapter describes the methods of synthesis employed for these materials and the characterization techniques adopted. Some experimental setups like thermal conductivity and hot pressing unit that were fabricated as part of the work are described in detail. The thermal conductivity apparatus is based on the principle of parallel heat flow technique. It allows accurate measurement of K and S in the temperature range 300-700 K. The induction based hot-pressing unit allows compaction of polycrystalline powders to near theoretical densities thereby allowing quantitative evaluation of the physical properties. In the third chapter, an understanding of ductility/brittleness based of electron charge density distribution is attempted. The electron charge density in Tin and simple metals (BCC and FCC) is analyzed using Bader’s Atoms in Molecule (AIM) theory. Also the relevant surface and dislocation energies in these materials are calculated according to the Rice Model. It is found that the electron densities at the critical points correlate in a simple way with the relevant stacking fault and surface energetics. Based on these results, a ductility parameter (DM odel) based on electron charge distribution, to predict the effects of chemical substitutions on ductility/brittleness in materials is proposed. In the fourth chapter, possible elements to impart ductility in MoSi2 are identified based on the DM odel values. Calculations indicate, Nb, Ta, Al, Mg and Ga to be suitable candidates for improving ductility in MoSi2. Also oxidation studies based on present experiments and reported literature data reveal, Al to improve the intermediate temperature (773-873 K) oxidation behavior. Thus to simultaneously improve the low temperature ductility and oxidation resistance, Nb and Al were identified as suitable candidates. In the fifth chapter, the experimental data of Nb and Al co-substituted MoSi2 samples are reported. Oxidation studies carried out by thermogravimetry show improved oxidation resistance in Nb and Al co-substituted samples compared to pure MoSi2 in the temperature range of 773-873 K. Mechanical characterization was carried out for (Mo0.99Nb0.01)(Si0.96Al0.04)2 co-substituted composition. Compression testing at room temperature show plastic deformation at low strain rates (10−3 /sec). Indentation experiments show a reduction in the hardness and stiffness compared to pure MoSi2. There is also an increase in the fracture toughness (K1C ) value with the fracture modes being predominantly transgranular. The sixth chapter describes the structural, thermal and transport properties of CrSi2. Structural refinement was carried out by Rietveld method and the positional, thermal parameters and occupancy were fixed. Thermo-gravimetric analysis shows oxidation resistance in powdered samples upto 1000 K. Thermal expansion (α) studies reveal anisotropy in the α values with an unusual decrease in the average αV values between 500 and 600 K. Measurements of electrical resistivity and seebeck coefficient indicate a degenerate semiconducting behavior. Electronic band structure calculations indicate a narrow indirect band gap (EG) material with EG~0.35 eV. Thermal conductivity (K) measurements show a decrease in K value with increasing temperature. Calculation of the thermoelectric figure of merit (ZT) show a maximum value of 0.18 at 800 K for the temperature range studied. Based on an analysis of the experimental and theoretical results, it is identified that further improvements in ZT of CrSi2 may be possible by reducing the lattice thermal conductivity and optimization of the carrier concentration. In chapter seven, the effect of particle size on ZT of CrSi2 is studied. Nano powders of CrSi2 were prepared by mechanical milling. Contamination is found to be a major problem during milling and the different milling parameters (milling speed, atmosphere, dispersant etc) were optimized to minimize contamination. The milled powders were further hot pressed to achieve high densities in a short duration thereby minimizing the grain growth. It is observed that the lattice thermal conductivity is reduced significantly with decreasing grain size. Measurements of ZT show a maximum value of 0.20 in the milled sample compared to 0.14 in arc melted CrSi2 at 600 K. In chapter eight the effect of chemical substitutions on ZT of CrSi2 is studied. Mn substitutions in Cr site were carried out to study the effect of atomic mass on lattice thermal conductivity (KP ). Al substitutions in Si site were carried out to tune the Fermi level. Results of Mn substitution show a large decrease in KP but also a reduction in the thermoelectric power factor (S2σ). The maximum ZT observed in the Mn substituted samples was 0.12 at 600 K. Al substitution results in an increase in the thermoelectric power factor and a subsequent increase in ZT. The maximum ZT observed was 0.27 at 700 K for 10% substitution of Al in Si site. The work reported in the thesis has been carried out by the candidate as a part of the Ph.D. training programme at Materials Research Centre, Indian Institute of Science, Bangalore, India. He hopes that this work would constitute a worthwhile contribution towards (a) basic understanding of ductility/brittleness in materials and understanding the effects of chemical substitutions, (b) Suitability of chemically substituted MoSi2 to overcome the problems of low temperature brittleness and oxidation. (c) Development of CrSi2 as a high temperature thermoelectric material.
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Books on the topic "Cubic air"

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The 2006-2011 World Outlook for New Portable Air Compressors with 75 to 124 Cubic Feet Per Minute. Icon Group International, Inc., 2005.

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The 2006-2011 World Outlook for New Portable Air Compressors with 125 to 249 Cubic Feet Per Minute. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for New Portable Air Compressors with 250 to 599 Cubic Feet Per Minute. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 World Outlook for New Portable Air Compressors with Less Than 11 Cubic Feet Per Minute. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 World Outlook for New Portable Air Compressors with at Least 600 Cubic Feet Per Minute. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 World Outlook for New Portable Air Compressors with 75 to 124 Cubic Feet Per Minute. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 World Outlook for New Portable Air Compressors with 11 to 74 Cubic Feet Per Minute. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 World Outlook for New Portable Air Compressors with 125 to 249 Cubic Feet Per Minute. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for New Portable Air Compressors with at Least 600 Cubic Feet Per Minute. Icon Group International, Inc., 2005.

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The 2006-2011 World Outlook for New Portable Air Compressors with 11 to 74 Cubic Feet Per Minute. Icon Group International, Inc., 2005.

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Book chapters on the topic "Cubic air"

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Tric, E., G. Labrosse, and M. Betrouni. "Numerical experimentation of the first transition to unsteadiness of air free convection in a differentially heated cubic cavity with non active adiabatic walls." In Notes on Numerical Fluid Mechanics (NNFM). Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-89838-8_44.

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Sarfraz, Muhammad. "Outline Capture of Images by Multilevel Coordinate Search on Cubic Splines." In AI 2009: Advances in Artificial Intelligence. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-10439-8_64.

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Whiteman, C. David. "Atmospheric Structure and the Earth's Boundary Layer." In Mountain Meteorology. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195132717.003.0011.

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The earth's atmosphere is divided into four layers: the troposphere, stratosphere, mesosphere, and thermosphere (figure 4.1). These layers are defined by alternating decreases and increases in air temperature with height. The boundaries between the layers are called the tropopause, stratopause, and mesopause. The troposphere, the lowest layer of the atmosphere, supports life on the planet and is the layer in which “weather” occurs. It extends about 7 mi (11 km) above sea level and is characterized by a mean temperature decrease with height (—ΔT/ Δz) of about 3.5°F per 1000 ft, or 6.5°C per km. This decrease explains the lower temperatures encountered at higher elevations in the mountains. Although the mean temperature decreases with height in the troposphere, the atmospheric structure, particularly at the base of the troposphere, varies significantly over time as the earth warms during the day and cools at night, as the seasons change, and as weather systems move through the atmosphere. The vertical structure of the atmosphere is characterized by an exponential decrease in air density and pressure with height. Air density is the mass per unit volume of the atmosphere as expressed, for example, in kilograms per cubic meter or pounds per cubic foot. Air pressure is the force exerted on a unit area by the weight of the air molecules above the measurement point as expressed, for example, in millibars or pounds per square inch. Air pressure at any given level is thus a measurement of the weight of a column of air above that level. Although there is no "edge" to the earth's atmosphere, approximately 99.9% of the air molecules (and therefore the weight of the atmosphere) are found below 31 mi (50 km). Temperature, density, and pressure are interrelated, so that a change in one will result in changes in the other two. The mathematical description of this relationship is called the gas law (appendix A). The gas law allows any one of these variables to be calculated if values for the other two variables are known.
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"Effects of Various Parameters on the Convection of Air in a Cubic Enclosure Under a Magnetic Field." In Magnetic Convection. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2005. http://dx.doi.org/10.1142/9781860947124_0017.

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Grande, Giulia, Jing Wu, Petter L. S. Ljungman, Massimo Stafoggia, Tom Bellander, and Debora Rizzuto. "Long-Term Exposure to PM2.5 and Cognitive Decline: A Longitudinal Population-Based Study." In Advances in Alzheimer’s Disease. IOS Press, 2021. http://dx.doi.org/10.3233/aiad210026.

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Background: A growing but contrasting evidence relates air pollution to cognitive decline. The role of cerebrovascular diseases in amplifying this risk is unclear. Objectives: 1) Investigate the association between long-term exposure to air pollution and cognitive decline; 2) Test whether cerebrovascular diseases amplify this association. Methods: We examined 2,253 participants of the Swedish National study on Aging and Care in Kungsholmen (SNAC-K). One major air pollutant (particulate matter ≤2.5 μm, PM2.5) was assessed yearly from 1990, using dispersion models for outdoor levels at residential addresses. The speed of cognitive decline (Mini-Mental State Examination, MMSE) was estimated as the rate of MMSE decline (linear mixed models) and further dichotomized into the upper (25% fastest cognitive decline), versus the three lower quartiles. The cognitive scores were used to calculate the odds of fast cognitive decline per levels of PM2.5 using regression models and considering linear and restricted cubic splines of 10 years exposure before the baseline. The potential modifier effect of cerebrovascular diseases was tested by adding an interaction term in the model. Results: We observed an inverted U-shape relationship between PM2.5 and cognitive decline. The multi-adjusted piecewise regression model showed an increased OR of fast cognitive decline of 81%(95%CI = 1.2–3.2) per interquartile range difference up to mean PM2.5 level (8.6 μg/m3) for individuals older than 80. Above such level we observed no further risk increase (OR = 0.89;95%CI = 0.74–1.06). The presence of cerebrovascular diseases further increased such risk by 6%. Conclusion: Low to mean PM2.5 levels were associated with higher risk of accelerated cognitive decline. Cerebrovascular diseases further amplified such risk.
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White, Robert E. "Where the Vine Roots Live." In Understanding Vineyard Soils. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199342068.003.0007.

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Chapter 3 gives examples of how grapevines, being woody perennials, have the potential to develop extensive, deep root systems when soil conditions are favorable. One of the most important factors governing root growth is a soil’s structure, the essential attributes of which are • Spaces (collectively called the pore space or porosity) through which roots grow, gases diffuse, and water flows • Storage of water and natural drainage following rain or irrigation • Stable aggregation • Strength that not only enables moist soil to bear the weight of machinery and resist compaction but also influences the ease with which roots can push through the soil The key attributes of porosity, aeration and drainage, water storage, aggregation, and soil strength are discussed in turn. Various forces exerted by growing roots, burrowing animals and insects, the movement of water and its change of state (e.g., from liquid to ice) together organize the primary soil particles—clay, silt, and sand—into larger units called aggregates. Between and within these aggregates exists a network of spaces called pores. Total soil porosity is defined by the ratio . . . Porosity = Volume of pores/Volume of soil . . . A soil’s A horizon, containing organic matter, typically has a porosity between 0.5 and 0.6 cubic meter per cubic meter (m3/m3)—also expressed as 50% to 60%. In subsoils, where there is little organic matter and usually more clay, the porosity is typically 40% to 50%. Box 4.1 describes a simple way of estimating a soil’s porosity. Total porosity is important because it determines how much of the soil volume water, air, and roots can occupy. Equally important are the shape and size of the pores. The pores created by burrowing earthworms, plant roots, and fungal hyphae are roughly cylindrical, whereas those created by alternate wetting and drying appear as cracks. Overall, however, we express pore size in terms of diameter (equivalent to a width for cracks). Table 4.1 gives a classification of pore size based on pore function.
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Hu, Wentao, Yongjun Tian, and Zhongyuan Liu. "Carbon Vacancy Ordered Non-Stoichiometric ZrC0.6." In MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4066-5.ch016.

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The starting nanopowders of non-stoichiometric zirconium carbide (ZrCx) were fabricated via milling Zr powders in toluene for different dwell times. The carbon content was determined to depend on the milling time and the used amount of toluene. The bulk non-stoichiometric ZrCx with different x were prepared by spark plasma sintering of the obtained ZrCx nanopowders. The microstructural features of a sintered ZrC0.6 sample were investigated via the measurements of XRD, TEM, and HRTEM. It was found that the carbon vacancies have an ordering arrangement in C sublattice, forming a Zr2C-type cubic superstructural phase with space group of Moreover, it was observed that the superstructural phase exists in nano-domains with an average size of ~30 nm owing to the ordering length in nanoscale. During the heating treatment in air, it was recognized that the diffusion of oxygen atoms is significantly facilitated through the ordered carbon vacancies. For the heating treatment at low temperature (<300°C), the oxygen atoms diffuse easily into and occupy the ordered carbon vacancies, forming the oxy-carbide of ZrC0.6O0.4 with ordered oxygen atoms. At the heating temperature higher than 350 °C an amorphous layer of ZrC0.6Oy>0.4 was identified to be formed due to the diffusion of superfluous oxygen atoms into Zr-tetrahedral centers. Inside the amorphous layer, the metastable tetragonal zirconia nanocrystals are recognized to be gradually developed.
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Scerri, Eric. "The Periodic System." In The Periodic Table. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190914363.003.0006.

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In ancient Greek times, philosophers recognized just four elements—earth, water, air, and fire—all of which survive in the astrological classification of the 12 signs of the zodiac. At least some of these philosophers believed that these different elements consisted of microscopic components with differing shapes and that this explained the various properties of the elements. These shapes or structures were believed to be in the form of Platonic solids (figure 1.1) made up entirely of the same two-dimensional shape. The Greeks believed that earth consisted of microscopic cubic particles, which explained why it was difficult to move earth. Meanwhile, the liquidity of water was explained by an appeal to the smoother shape possessed by the icosahedron, while fire was said to be painful to the touch because it consisted of the sharp particles in the form of tetrahedra. Air was thought to consist of octahedra since that was the only remaining Platonic solid. A little later, a fifth Platonic solid, the dodecahedron, was discovered, and this led to the proposal that there might be a fifth element or “quintessence,” which also became known as ether. Although the notion that elements are made up of Platonic solids is regarded as incorrect from a modern point of view, it is the origin of the very fruitful notion that macroscopic properties of substances are governed by the structures of the microscopic components of which they are comprised. These “elements” survived well into the Middle Ages and beyond, augmented with a few others discovered by the alchemists, the precursors of modern-day chemists. One of the many goals of the alchemists seems to have been the transmutation of elements. Not surprisingly, perhaps, the particular transmutation that most enticed them was the attempt to change the base metal lead into the noble metal gold, whose unusual color, rarity, and chemical inertness have made it one of the most treasured substances since the dawn of civilization.
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"Occupational Toxicology." In Environmental Toxicology, edited by Sigmund F. Zakrzewski. Oxford University Press, 2002. http://dx.doi.org/10.1093/oso/9780195148114.003.0013.

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Industrial workers make up the segment of the population that is most vulnerable to chemical injury. To protect them from occupation-related harm, the American Conference of Governmental and Industrial Hygienists publishes annually revised threshold limit values (TLVs) (1), guidelines for permissible chemical exposure at the work place. TLV refers to concentrations of substances in parts per million or milligrams per cubic meter in the air to which most workers can be exposed on a daily basis without harm. These values apply to the work place only. They are not intended as guidelines for ambient air quality standards for the population at large. Obviously, genetic variations and diverse lifestyles (such as smoking, alcohol use, medication, and drug use) must be considered. Hypersensitive individuals may be adversely affected by exposure to certain chemicals even within the limits of the TLV. Thus, TLVs should be treated as guidelines only and not as fixed standards. The recommended goal is to minimize chemical exposure in the work place as much as possible. TLVs are expressed in three ways: 1. Time-weighted average (TLV–TWA) designates the average concentration of a chemical to which workers may safely be exposed for 8 h per day and 5 days per week. 2. Short-term exposure limit (TLV–STEL) designates permissible exposure for no more than 15 min, and no more than four times per day, with at least 60-min intervals between exposures. 3. Ceiling concentrations (TLV–C) are concentrations that should not be exceeded at any time. How protective the TLVs are is being questioned. The 1990 report that analyzed the scientific underpinnings of the TLVs revealed that at the exposure at or below the TLV, only few cases showed no adverse effect (2). In some cases even 100% of those exposed were affected. On the other hand, there was a good correlation between the TLVs and the measured exposure occurring in the work place. Thus, it appears that the TLVs represent levels of contaminants that may be encountered in the work place, rather than protective thresholds. Biological exposure indices (BEIs) provide another way of looking at exposure to chemicals.
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García, Mario, Héctor Ulloa, Omar García, et al. "Particle and Carbon Monoxide Atmospheric Pollution in the City of Tepic, Nayarit, Mexico." In Environmental Sustainability - Preparing for Tomorrow. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95579.

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Actively caring for the environment is an issue that prevails in the international debate, and our country takes part on this argument. One aspect of environmental deterioration is, with no doubt, atmospheric pollution; a constant in modern societies, which, in the attempt to find growth and development, impact the natural and urban environment they inhabit. A distinctive feature of commercial and economic exchange are the strategic cities, so-called capitals, in addition to the territories where coastal tourism predominates as an engine of regional human development. In this balance, which is far from being sustainable and fair, an exponential consumer market dominates and generates the progressive increase in the use of fossil fuels. The former being emitted into the atmosphere, in such a way that they alter chemical composition and cause harmful air quality. In addition, the territory is impacted, intoxicating the soil and water, which are the final deposit. The objective of this work is to determine the temporal behavior of atmospheric pollutants in the city of Tepic, Nayarit, Mexico and to identify the dominant pollution indicators considering the international and national context. Through the statistical analysis of the databases of particles smaller than 2.5 micrometers, particles smaller than 10 micrometers and carbon monoxide, the behaviors of these pollutants in the study area were obtained. Among the most significant results, particles smaller than 2.5 micrometers showed maximum levels outside the norm almost all year round, with values ​​reaching 170 micrograms per cubic meter. On the other hand, the particles smaller than 10 micrometers presented satisfactory levels in their average behavior; however, the maximum concentrations remained outside the official Mexican standard. Regarding the analysis of CO, a behavior within the maximum permissible limits of protection for the population was reported; Nevertheless, by favoring the formation of tropospheric ozone, its contribution is significant, especially when the atmosphere is highly photo-reactive. This research can be used as a timely tool for mitigation of climate change, where the results contribute to the review and rethinking of public management of the environment towards sustainable development.
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Conference papers on the topic "Cubic air"

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de Gassowski, G., Olivier Daube, Shihe Xin, and Y. Fraigneau. "BIFURCATIONS AND MULTIPLE SOLUTIONS IN AN AIR-FILLED DIFFERENTIALLY HEATED CUBIC CAVITY." In Annals of the Assembly for International Heat Transfer Conference 13. Begell House Inc., 2006. http://dx.doi.org/10.1615/ihtc13.trb.5.

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Kozar, A. I. "Resonance cubic lattice of spherical air-filled bubbles located in magnetodielectric medium." In 2010 20th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo 2010). IEEE, 2010. http://dx.doi.org/10.1109/crmico.2010.5632550.

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Gelfgat, Alexander. "Oscillatory Instability of Natural Convection of Air in a Laterally Heated Cubic Box." In The 15th International Heat Transfer Conference. Begellhouse, 2014. http://dx.doi.org/10.1615/ihtc15.cpm.009724.

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Pisani, Giovanni, Alberto Zerbinato, Carlo Tregambe, and Ernesto Benini. "Development of a Medium-Size Steam Reformer for CHP Applications Based on PEM Fuel Cells." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23791.

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This paper describes technological of a fuel processor for hydrogen production able to convert 10 cubic meters of methane per hour. This device has been developed to feed hydrogen CHP suitable for the most common residential applications. The measured conversion efficiencies are extremely high: after the steam reformer the results are 76%H2; 18%CO2; 0,5%CH4; 5%CO; but the carbon monoxide is totally reduced throughout the water gas shift and the partial oxidation which contemporarily increase the hydrogen to over 77%. According to these results, this fuel processor is one of the first middle sized reformer to achieve, at comparable costs per cubic meter, conversion performance that were normally obtained only by industrial reforming plants.
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Chyu, M. K., C. H. Yen, and S. Siw. "Comparison of Heat Transfer From Staggered Pin Fin Arrays With Circular, Cubic and Diamond Shaped Elements." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-28306.

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This study investigates the effects of pin shape of staggered arrays on heat transfer enhancement. Three different pins: circular, cubic, and diamond, are studied. The arrays consists of twelve rows of five columns with geometry configuration of ST/D = 2.5 and SL/D = 2.5, H/D = 1. Tests were conducted at Reynolds number between 12,000 and 19,000. The heat transfer measurement uses a liquid crystal imaging technique combined with a one-dimensional, transient conduction model and a lumped heat-capacitance model. The results reveal that the heat transfer from the cubic pin arrays and diamond pin arrays is higher than that from the circular pin arrays at the same Reynolds number. However, the circular pin arrays provide the lowest pressure loss among the three arrays. Considering the trade-offs between heat transfer and pumping power, the circular pin arrays may still be the better choice as a heat exchanger.
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K., Sato, Tano S., and Maeda Y. "Observations of Venting Explosions in a Small Cubic Vessel with Rich Propane-Air Mixtures." In Sixth International Seminar on Fire and Explosion Hazards. Research Publishing Services, 2011. http://dx.doi.org/10.3850/978-981-08-7724-8_10-03.

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A., Garcia Agreda, Di Benedetto A., Russo P., Salzano E., and Sanchirico R. "Observations of Venting Explosions in a Small Cubic Vessel with Rich Propane-Air Mixtures." In Sixth International Seminar on Fire and Explosion Hazards. Research Publishing Services, 2011. http://dx.doi.org/10.3850/978-981-08-7724-8_10-04.

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Okura, Manabu, and Kiyoaki Ono. "Numerical Simulation of the Cooling Process of Cubic Shells." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44177.

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In order to keep the environment in an air-conditioned room comfortable, it is important to anticipate the air velocity and temperature fields precisely. The numerical code, solving simultaneously the Navier-Stokes equations governing flow field inside and outside the room and the heat conduction equation applying to walls, are developed. The assumption that the heat transfer coefficient between the fluid and the surface of solids is not used. This code is applied to investigate the cooling process of a cubic shell. The computational results agree with the experimental results. We also investigated the same process of the cubic shells whose walls are internally or externally insulated. The difference of the amount of heat transfer will be discussed.
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Song, B., та R. S. Amano. "Application of Non-Linear k–ω Model to the Turbulent Flow Inside a Sharp U-Bend". У ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0225.

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Simulation of the complex flow inside a sharp U-bend needs both refined turbulence models and higher order numerical discretization schemes. In the present study, a nonlinear low-Reynolds number (low-Re) k–ω model including the cubic terms was employed to predict the turbulent flow through a square cross-sectioned U-bend with a sharp curvature, Rc/D = 0.65. In the turbulence model employed for the present study, the cubic terms are incorporated to represent the effect of extra strain-rates such as streamline curvature and three-dimensionality on both turbulence normal and shear stresses. In order to accurately predict such complex flowfields, a higher-order bounded interpolation scheme (Song, et al., 1999) has been used to discretize all the transport equations. The calculated results by using both the non-linear k–ω model and the linear low-Reynolds number k–ε model (Launder and Sharma, 1974) have been compared with experimental data. It is shown that the present model produces satisfactory predictions of the flow development inside the sharp U-bend and well captures the characteristics of the turbulence anisotropy within the duct core region and wall sub-layer.
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Amin, Mukit, Faisal Alam Tushar, Delower Hossen, and Sumon Saha. "Conjugate natural convection in three-dimensional differentially heated cubic partitioned cavity filled with air and water." In Proceedings of the 13th International Conference on Mechanical Engineering (ICME2019). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0037525.

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Reports on the topic "Cubic air"

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Rahai, Hamid, and Jeremy Bonifacio. Numerical Investigations of Virus Transport Aboard a Commuter Bus. Mineta Transportation Institute, 2021. http://dx.doi.org/10.31979/mti.2021.2048.

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The authors performed unsteady numerical simulations of virus/particle transport released from a hypothetical passenger aboard a commuter bus. The bus model was sized according to a typical city bus used to transport passengers within the city of Long Beach in California. The simulations were performed for the bus in transit and when the bus was at a bus stop opening the middle doors for 30 seconds for passenger boarding and drop off. The infected passenger was sitting in an aisle seat in the middle of the bus, releasing 1267 particles (viruses)/min. The bus ventilation system released air from two linear slots in the ceiling at 2097 cubic feet per minute (CFM) and the air was exhausted at the back of the bus. Results indicated high exposure for passengers sitting behind the infectious during the bus transit. With air exchange outside during the bus stop, particles were spread to seats in front of the infectious passenger, thus increasing the risk of infection for the passengers sitting in front of the infectious person. With higher exposure time, the risk of infection is increased. One of the most important factors in assessing infection risk of respiratory diseases is the spatial distribution of the airborne pathogens. The deposition of the particles/viruses within the human respiratory system depends on the size, shape, and weight of the virus, the morphology of the respiratory tract, as well as the subject’s breathing pattern. For the current investigation, the viruses are modeled as solid particles of fixed size. While the results provide details of particles transport within a bus along with the probable risk of infection for a short duration, however, these results should be taken as preliminary as there are other significant factors such as the virus’s survival rate, the size distribution of the virus, and the space ventilation rate and mixing that contribute to the risk of infection and have not been taken into account in this investigation.
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