Thematische Bibliographien / Gases and allied problems

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Auswahl der wissenschaftlichen Literatur zum Thema „Gases and allied problems“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Gases and allied problems"

Renshaw, Ian, und Brendan Moy. „A Constraint-Led Approach to Coaching and Teaching Games: Can going back to the future solve the «they need the basics before they can play a game» argument?“ Ágora para la Educación Física y el Deporte 20, Nr. 1 (25.05.2018): 1. http://dx.doi.org/10.24197/aefd.1.2018.1-26.

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Despite the continued popularity of Games Centred Approaches with tertiary level academics, the take-up by practitioners has been limited. In a recent survey of entry level HPE students undertaken at our university, 95% reported that they had received a predominantly traditional experience in school physical education lessons. This finding is in line with a common response when we engage with practitioners who strongly advocate the need for games players to learn the basics before they can play a game. In this paper we will present concepts and practical exemplars demonstrating a Constraint-Led Approach (CLA) to games teaching and coaching. We will show that adopting a CLA has the potential to provide practitioners with the tools to address this significant barrier and potentially enhance the adoption of games-based approaches. We will argue that the technique-tactics dichotomy is a redundant framework as the intentions and actions of learners is a function of their current action capabilities. However, we will also propose that games-based practitioners need to develop pedagogical practices that initially develop intra-individual-environment co-ordination before moving onto a more traditional focus on inter-individual-environment co-ordination (i.e., how teams organise to solve games-based problems). A key focus will be on the need to consider the mutuality of the individual and the environment and how backyard games allied to CLA methods can help practitioners design better games based programmes that will meet the needs of all games players irrespective of age or ability level.

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Silva, Farlan dos Santos, Brenda Lopes Nunes und Ana Paula de Souza Ramos. „Impact of Information and Communication Technologies on histology teaching: an integrative literature review“. Research, Society and Development 11, Nr. 4 (15.03.2022): e17711427271. http://dx.doi.org/10.33448/rsd-v11i4.27271.

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The aim was to identify the impact of the use of Information and Communication Technologies (ICTs) in the teaching of histology. This is an integrative literature review, qualitative and descriptive. We performed the search on October 2021, using the Virtual Health Library (VHL), Cumulative Index to Nursing and Allied Health Literature (CINAHL), Pubmed, and Science Direct as electronic databases. As a search strategy, the following descriptors in English and Portuguese were used: (“Information technology” AND “Histology”); (“Information technology” AND “Histology” AND “teaching”); (“Information and communication technology” AND “histology”). Original articles that answered the guiding question, in Spanish, English, and Portuguese, published between 2016 and 2021, were included. Four thousand one hundred and fifty-seven (4,157) articles were retrieved, and only seven were selected as eligible for the research. The ICTs present in the sample were Virtual Learning Environments (VLE), with Blackboard and Moodle platforms; Virtual Microscopy; and Digital Games, through the virtual game Kahoot!. The analysis of the data got shows that the impact of ICTs is positive and relevant for academic development, as they enable an interactive environment, capable of being accessed frequently and from different places, besides reinforcing the learning developed in a face-to-face environment. However, instability in the operating system, problems related to connectivity, or even the lack of access of some students to the internet network were perceived as challenges in using ICTs.

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GOLDANI, Eduardo. „CATALYTIC CONVERTER: A GREAT ALLIED AT POLLUTING GASES“. Periódico Tchê Química 02, Nr. 1 (20.08.2004): 52–53. http://dx.doi.org/10.52571/ptq.v1.n02.2004.agosto/10_pgs_52_53.pdf.

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G., E., und G. K. Bhat. „Rasa Theory and Allied Problems“. Journal of the American Oriental Society 109, Nr. 1 (Januar 1989): 170. http://dx.doi.org/10.2307/604411.

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Jaafar, Nor Subhi, Idayu Badilla Idris, Norfazilah Ahmad, Rozita Hod, Baidi Baddiri und Rafidah Hod. „Internet addiction and its association with depression, anxiety, and stress symptoms among allied health students in Malaysia“. Medical Journal of Indonesia 31, Nr. 1 (22.04.2022): 56–61. http://dx.doi.org/10.13181/mji.oa.225820.

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BACKGROUND Internet addiction (IA) is prone to be experienced by students and has become a major health concern. However, data on IA among allied health students are limited. This study aimed to describe the prevalence of IA and the association between mental health problems and IA among allied health students in Malaysia. METHODS A cross-sectional study was conducted from July to December 2021 in three government-funded allied health training institutes in Malaysia. A total of 265 allied health students undertaking a diploma in nursing, medical assistant training, physiotherapy, occupational therapy, and diagnostic imaging were recruited using stratified random sampling. The Malay version of the IA test was used to measure IA, while depression, anxiety and stress scale-21 items were used to assess their mental health problems. A general linear model was used to analyze the association between IA scores and mental health problems. RESULTS The prevalence of IA among allied health students was more than 80%, with 16.2% and 2.3% of them reporting moderate and severe IA, respectively. Higher depression (p<0.001), anxiety (p<0.001), and stress scores (p = 0.002) were associated with higher IA scores. CONCLUSIONS There were significant associations between mental health problems and IA scores among allied health students. Future studies with rigorous scientific methods are necessary to explore mental health effects on IA. Early intervention is also needed to prevent mental health problems among allied health students to overcome the problem of IA.

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Uttej, Dubany. „Youth in Agriculture : Problems and Suggestions“. Indian Research Journal of Extension Education 22, Nr. 5 (01.12.2022): 247–50. http://dx.doi.org/10.54986/irjee/2022/dec_spl/247-250.

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Today's youth are the hope of the future. They are the real spirit of future agriculture. Young people not only look for their own livelihood, but also for respect and purpose in life. It is a well-known fact that only few young people engage in agriculture, although majority of rural youth have the energy and enthusiasm to do well in agri and allied jobs. In this context, it is worthwhile to know the reason for low participation i.e, problems faced by youth in agriculture and allied activities and their suggestions. Keeping this in mind, a research study was conducted in Warangal district of Telangana state with a sample size of 120 youth selected using a simple random sampling procedure. The data was collected from primary sources with structured interview schedule. The study employed descriptive statistics and garret ranking method to analyse the data. The study indicated that majority of the youth faced the problem of scarcity of labour, lack of irrigation facilities, fear of drudgery in agriculture and allied activities and suggested for timely supply of necessary inputs (93.3%), timely provision of subsidy/credit, mechanization in agricultural sector

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Galashev, A., und A. Galasheva. „Problems of Ecological Policy“. Voprosy Ekonomiki, Nr. 11 (20.11.2006): 111–17. http://dx.doi.org/10.32609/0042-8736-2006-11-111-117.

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Concentration of greenhouse gases in the atmosphere is increasing due to all growing anthropogenous emissions. It influences the climate more and more strongly. Economic approaches should improve economic efficiency of investments. Gradual increase of the carbon tax regulates distribution of the rights of generations to emissions of greenhouse gases. The market of carbon dioxide, in which Russia plays one of the basic roles, begins to form in Europe. The statutory acts regulating emissions and absorption of greenhouse gases should be accepted in Russia.

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O.T. Shatmanov, Zh.Zhanbirov und Zh.A.Baiburaeva. „PROBLEMS GREENHOUSE GASES EMITTED FROM VEHICLES“. Herald of KSUCTA n a N Isanov, Nr. 4 (16.12.2019): 673–79. http://dx.doi.org/10.35803/1694-5298.2019.4.673-679.

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The article deals with the issues of environmental safety in the operation of motor vehicles, which are one of the leaders in greenhouse gas emissions into the environment. The level of motorization of the country's cities, providing the social side of life, proportionally leads to the development of environmental problems. The article considers the main factors of transport use in different regions of Kazakhstan and their negative impact on the environment. The analysis of the key problems of public transport, more than a third of which are the percentage of greenhouse gas emissions and harmful substances into the atmosphere. The main directions of environmental safety, the necessity of methodological and methodical study on a qualitatively new basis of the problems of the use of natural gas as an alternative motor fuel. The foreign experience of using fuel from alternative sources is analyzed.

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Stanley, W. Brad M., und Christopher O. Muller. „ODOROUS GASES EQUAL COMPUTER CONTROL PROBLEMS“. Proceedings of the Water Environment Federation 2003, Nr. 5 (01.01.2003): 21–30. http://dx.doi.org/10.2175/193864703784606594.

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Storozhev, Yu I., und V. S. Zlobin. „Perspective Solutions of Environmental Problems of Aluminum Plants“. Ecology and Industry of Russia 22, Nr. 12 (04.12.2018): 10–13. http://dx.doi.org/10.18412/1816-0395-2018-12-10-13.

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The mechanism of formation of harmful components of anode gases of aluminum production is considered. For purification of anode gases the nepheline slime, which is alumina withdrawal from nepheline ore, is offered as adsorbent and the catalyst. The new design of a gas-collecting bell of the Soderbergh,s electrolyzer for collecting and thermal neutralization of anode gases with adjustable air supply is developed.

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Dissertationen zum Thema "Gases and allied problems"

Patel, Prakash Shashikant. „Diffusion problems and degradation of bearing overlays“. Thesis, London Metropolitan University, 1989. http://repository.londonmet.ac.uk/3192/.

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The corrosion and degradation of Pb-Sn bearing overlays Is a bilateral process . During service, the lubricant becomes corrosive due to the breakdown of inhibitors with subsequent oxidation occurring at operating temperatures (120-170[degrees]). ...

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Scherer, Caio Sarmento. „Efeitos de evaporação em gases rarefeitos“. reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17889.

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Neste trabalho, o fenômeno de evaporação em gases rarefeitos e analisado, para o caso de uma espécie de gás bem como de misturas binárias. Evaporação fraca e forte são consideradas para escoamentos de gases em canal e semi-espaco. Também e investigado o fenômeno conhecido como reverso de temperatura, típico de gases em estado de rarefação. O método ADO, uma versão analítica do método de ordenadas discretas, é utilizado para construção de soluções em forma fechada para os diversos problemas e quantidades de interesse, como perfis de temperatura e fluxos de calor. Para o caso de um gás, uma solução unificada e desenvolvida para problemas formulados a partir dos modelos cinéticos, derivados da equação de Boltzmann, BGK, S, Gross- Jackson e MRS. No caso de mistura binária de gases, a formulação matemática e baseada no modelo McCormack. Particularmente, quando a evaporação forte e abordada, e aspectos não lineares devem ser incluídos, a versão não linear do modelo BGK e utilizada. Neste caso, a solução ADO do modelo linear e utilizada em um processo chamado de pós-processamento para inclusão dos termos não lineares do problema e reavaliação das quantidades de interesse, evidenciando melhoria dos resultados obtidos pela formulação linear. Uma serie de resultados numéricos são listados e é observada, de forma geral, excelente exatidão e eficiência computacional.
In this work, evaporation phenomena in rarefied gas flow, for one gas case and binary mixtures, are analyzed. Weak and strong evaporation are considered in channel and half-space problems. The reverse of temperature problem, typical in rarefied gas dynamics, is also investigated. The ADO method, an analytical version of the discrete ordinates method, is used to develop closed form solutions, to several problems and quantities of interest, as temperature profiles and heat flows. For the one gas case, an unified solution is developed for the BGK, S, Gross-Jackson and MRS models, derived from the Boltzmann equation. For binary mixtures, the mathematical formulation is based on the McCormack model. Particularly, when strong evaporation is investigated, and nonlinear aspects have to be included, the nonlinear BGK model is used. In this case, the ADO solution, provided by the linear model, is considered in a post-processing procedure which takes into account the nonlinear terms to evaluate the quantities of interest, and improved results are obtained, in comparison with the linear version. A series of numerical results are listed and, in general, an excellent accuracy and good computational efficiency are observed.

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Zhang, Mei. „Some problems on conservation laws and Vlasov-Poisson-Boltzmann equation /“. access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ma-b23749465f.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2009.
"Submitted to Department of Mathematics in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves [90]-94)

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Yin, Jun, und 尹俊. „A continuum modeling approach to transport emission problems“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46603499.

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Davison, Elizabeth. „The wounded healer : clinical and counselling psychologists with experience of mental health problems“. Thesis, Canterbury Christ Church University, 2013. http://create.canterbury.ac.uk/12535/.

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This study aimed to explore how the experience of previous mental-health problems affects clinical and counselling psychologists’ approach to practice. Semi-structured interviews were conducted with six clinical and four counselling psychologists who had experienced mental-health difficulties. Data was analysed using Interpretative Phenomenological Analysis. Analysis of the interviews highlighted five master themes: Use of the personal-self of psychologist; Ambivalence; Identity as a psychologist; Psychologists as agent of change; and Finding meaning in suffering. The results of this research showed that psychologists with a history of mental-health problems actively draw upon their experience. In managing their dual identity of service-user and professional, they reported a degree of ambivalence which influenced the way that they viewed themselves and their practice. Their personal experiences seemed to be closely tied up with their professional-identity, which either conflicted with their sense of self or complemented it through highlighting how fortunate they were compared to others. The interviews frequently highlighted how psychologists’ experiences can provide an impetus to speak out for patients’ rights to ensure that they are treated with respect and dignity. A number of psychologists with an experience of mental-health difficulties felt that they might not have pursued their career had they not had previous mental-health difficulties. There appeared to be mixed findings concerning whether the participants felt that their mental-health difficulties had helped or hindered their practice.

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Tsuji, Tetsuro. „Studies on Moving Boundary Problems in Rarefied Gas Dynamics“. 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174878.

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Tucker, Adam Philip. „Local moment phases in quantum impurity problems“. Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:538d2d83-963e-4a51-81cd-4235e9761da4.

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This thesis considers quantum impurity models that exhibit a quantum phase transition (QPT) between a Fermi liquid strong coupling (SC) phase, and a doubly-degenerate non-Fermi liquid local moment (LM) phase. We focus on what can be said from exact analytic arguments about the LM phase of these models, where the system is characterized by an SU(2) spin degree of freedom in the entire system. Conventional perturbation theory about the non-interacting limit does not hold in the non-Fermi liquid LM phase. We circumvent this problem by reformulating the perturbation theory using a so-called `two self-energy' (TSE) description, where the two self-energies may be expressed as functional derivatives of the Luttinger-Ward functional. One particular paradigmatic model that possesses a QPT between SC and LM phases is the pseudogap Anderson impurity model (PAIM). We use infinite-order perturbation theory in the interaction, U, to self-consistently deduce the exact low-energy forms of both the self-energies and propagators in each of the distinct phases of the model. We analyse the behaviour of the model approaching the QPT from each phase, focusing on the scaling of the zero-field single-particle dynamics using both analytical arguments and detailed numerical renormalization group (NRG) calculations. We also apply two `conserving' approximations to the PAIM. First, second-order self-consistent perturbation theory and second, the fluctuation exchange approximation (FLEX). Within the FLEX approximation we develop a numerical algorithm capable of self-consistently and coherently describing the QPT coming from both distinct phases. Finally, we consider a range of static spin susceptibilities that each probe the underlying QPT in response to coupling to a magnetic field.

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Litwin, Nicole S., Norman A. Assad, W. Andrew Clark, Tasha Ferrell, Ray M. Mohseni und Shimin Zheng. „Oxidative Stress, Dietary Fat Intake and Red Blood Cell Membrane Fatty Acid Composition in Women with and without Fertility Problems“. Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etsu-works/92.

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Krige, D. G. „A statistical approach to some mine valuation and allied problems on the Witwatersrand“. Thesis, 2015. http://hdl.handle.net/10539/17975.

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von, Goeler Friedel S. „Some theoretical problems in the physics of charged polymers“. 1997. https://scholarworks.umass.edu/dissertations/AAI9809408.

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This dissertation presents a theoretical study of a variety of charged polymer systems: Critical conditions are determined for adsorption of a charged polymer chain in an electrolyte solution by a curved, charged surface; the scaling behavior and density profiles of a polyelectrolyte brush is examined; the stretch-colapse transition of a charged, grafted polymer layers in a poor solvent is analyzed; and, the sequence dependence of heteropolymer configurations is calculated. These problems are studied theoretically using standard techniques of statistical mechanics.

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Bücher zum Thema "Gases and allied problems"

Chemical patents and allied patent problems. [Place of publication not identified]: Gale Ecco, Making Of Mode, 2010.

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Gases, American Welding Society Project Committee on Fumes and. Methods for sampling and analyzing gases from welding and allied processes. Miami, Fla: AWS, 1987.

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American Welding Society. Project Committee on Fumes and Gases. und American Welding Society. Committee on Safety and Health., Hrsg. Methods for sampling and analyzing gases from welding and allied processes. Miami, Fla: American Welding Society, 1996.

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Fizika slaboionizovannogo gaza: V zadachakh s reshenii͡a︡mi. 3. Aufl. Moskva: "Nauka," Glav. red. fiziko-matematicheskoĭ lit-ry, 1985.

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M, Smirnov B. Fizika slabo-ionizovanogo gaza: V zadachakh s reshenii︠a︡mi. 3. Aufl. Moskva: Nauka, 1985.

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K, Loyalka S., Tompson, R. V. (Robert Vaughn), 1958- und SpringerLink (Online service), Hrsg. Analytical Methods for Problems of Molecular Transport. Dordrecht: Springer, 2007.

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Contamination control and cleanrooms: Problems, engineering solutions, and applications. New York: Van Nostrand Reinhold, 1992.

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Smirnov, B. M. Plasma processes and plasma kinetics: 586 worked out problems for science and technology. Weinheim: Wiley-VCH, 2007.

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M, Adelman Alan, und Daly Mel P, Hrsg. 20 common problems in geriatrics. New York: McGraw-Hill, Health Professions Division, 2001.

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Simmers, Louise. Workbook to accompany diversified health occupations. 4. Aufl. Albany, N.Y: Delmar Publishers, 1998.

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Buchteile zum Thema "Gases and allied problems"

Bennaya, Souhir, und Moez Kilani. „Evaluating the Benefits of Promoting Intermodality and Active Modes in Urban Transportation: A Microsimulation Approach“. In Smart Cities, 279–94. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35664-3_15.

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AbstractThe objective of this chapter is to show how microsimulation can be used to study urban transportation problems, in particular those issues related to sustainable transport and innovations. A theoretical, though representative, geometry of an urban area with a set of concentric and radial roads is considered for the analysis. Microsimulation, which provides a precise description of traffic flows, is used to draw a detailed accounting of emissions of pollutant gases and fuel consumption. In the base-case situation, the private car is the main transport mode. We then consider alternative scenarios where users are allowed to switch to public transportation or biking. A combination of walking, biking, and public transportation is also allowed. Under this intermodal setting, we find that congestion level, fuel consumption, and emissions of pollutant gases decrease significantly (up to 30%).

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Douglas, Roy. „Inter-Allied problems, 1943“. In The World War 1939–1945, 180–93. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003187998-16.

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Ilich, Predrag-Peter. „Mechanics of Gases“. In Selected Problems in Physical Chemistry, 9–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04327-7_2.

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Cini, Michele, Francesco Fucito und Mauro Sbragaglia. „Bose-Einstein Gases“. In Solved Problems in Quantum and Statistical Mechanics, 315–35. Milano: Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-2315-4_10.

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Cini, Michele, Francesco Fucito und Mauro Sbragaglia. „Fermi-Dirac Gases“. In Solved Problems in Quantum and Statistical Mechanics, 337–62. Milano: Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-2315-4_11.

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Bruno, C., und L. Guarino. „Re-Entry Problems“. In Nonequilibrium Processes in Partially Ionized Gases, 659–68. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3780-9_55.

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Bebernes, Jerrold, und David Eberly. „Conservation Systems for Reactive Gases“. In Mathematical Problems from Combustion Theory, 129–61. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-4546-9_6.

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Müller, Ingo. „Extended Thermodynamics of Ideal Gases“. In Dynamical Problems in Continuum Physics, 257–76. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-1058-0_12.

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Skačej, Gregor, und Primož Ziherl. „Kinetic Theory of Gases“. In Solved Problems in Thermodynamics and Statistical Physics, 259–77. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27661-4_13.

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Woerlee, G. M. „Blood Gases — Arterial and Venous“. In Common Perioperative Problems and the Anaesthetist, 150–53. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1323-3_27.

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Konferenzberichte zum Thema "Gases and allied problems"

Cha´vez, Rosa H., Javier de J. Guadarrama, Leticia Carapia und Abel Herna´ndez-Guerrero. „Energy Savings and Pollution Reduction by Coupling a Three-Kiln Brick Production System for the Construction Industry“. In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60292.

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Atmospheric pollution is one of the most important environmental problems, becoming a phenomenon that could reach levels of serious consequences with irreversible environmental impacts. In Mexico, like in several other countries, brick makers carry out brick production by burning mixtures of different heavy fuels. Because of the wide variety of fuels used it is necessary to determine what types of residual gases are generated, in order to propose remedial treatments in production or to introduce substitution technologies. These preventive actions need to be put in place in order to comply with the Ecological Balance and Environment Protection General Law. Brick kilns emit pollutant gases and particles that remain in the air causing a serious health hazard to the near-factory residents. Amongst these pollutants are carbon monoxide (CO), sulfur oxides (SOx) and hydrocarbons. This paper presents the results of the analysis of a novel 3-kilns coupled system. This experimental analysis includes the determination of the combustion products for gases and particulate matter generated from the burning of the heavy fuels using Gas Chromatography and Scanning Electron Microscopy. Field data also allowed the determination of energy savings for this system, mainly due to the reduction of the consumption of fuel. Fortunately these results show a combined 30% energy savings and a reduction of pollutants and particle emissions.

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Khalil, Gamal, Jeff Yim und Gerald G. Vurek. „In vivo blood gases: problems and solutions“. In OE/LASE '94, herausgegeben von James A. Harrington, David M. Harris, Abraham Katzir und Fred P. Milanovich. SPIE, 1994. http://dx.doi.org/10.1117/12.180741.

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Baritz, Mihaela ioana. „"SERIOUS GAMES" FOR SERIOUS VISION PROBLEMS OF CHILDREN“. In eLSE 2016. Carol I National Defence University Publishing House, 2016. http://dx.doi.org/10.12753/2066-026x-16-072.

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In this paper the evaluation methodology of interactions between games and visual function development in preschool children was presented. In the first part are presented some important aspects of preschool children's perception of single or collective games, dynamic or static games, interactive or repetitive games. In this regard it is important to follow the action identifying the typology of games that they can accepted by each subject, it can place or it can understand. When children - subjects of this research have previously identified vision problems that require visual recovery program through systematic training, the serious games are the most useful instruments for achieving this goal. It was found during observations on children's behavior more efficiency to their visual recovery procedures when using various instruments or devices with which children interact like games. Using various games, tests or electronic applications (involving the use of computers or electronic devices) allowed the development of several forms of games and actions by which to track it, evaluate it and intervene on manifestations of visual dysfunctions. These procedures were developed on the principles of identifying, preventing the installation of visual impairments, the progressive recovery of visual function and that the principles of the so-called "serious games". In the paper, some important aspects of the experimental system used in assessment methodology and also the results on an analysis of preschool children sample are presented. In the final part of the paper we present the results of applying these methodologies to implement games in the actions recovery and rehabilitation of visual function previously detected or identified during these actions.

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Mobinipouya, Neda, und Omid Mobinipouya. „On the Heat Transfer Enhancement of Turbulent Gas Floes in Short Round Tubes Engaging a Light Gas Mixed With Selected Heavier Gases“. In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58136.

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A unique way for maximizing turbulent free convection from heated vertical plates to cold gases is studied in this paper. The central idea is to examine the attributes that binary gas mixtures having helium as the principal gas and xenon, nitrogen, oxygen, carbon dioxide, methane, tetrafluoromethane and sulfur hexafluoride as secondary gases may bring forward. From fluid physics, it is known that the thermo-physical properties affecting free convection with binary gas mixtures are viscosity ηmix, thermal conductivity λmix, density ρmix, and heat capacity at constant pressure. The quartet ηmix, λmix, ρmix, and Cp,mix is represented by triple-valued functions of the film temperature the pressure P, and the molar gas composition w. The viscosity is obtained from the Kinetic Theory of Gases conjoined with the Chapman-Enskog solution of the Boltzmann Transport Equation. The thermal conductivity is computed from the Kinetic Theory of Gases. The density is determined with a truncated virial equation of state. The heat capacity at constant pressure is calculated from Statistical Thermodynamics merged with the standard mixing rule. Using the similarity variable method, the descriptive Navier-Stokes and energy equations for turbulent Grashof numbers Grx > 109 are transformed into a system of two nonlinear ordinary differential equations, which is solved by the shooting method and the efficient fourth-order Runge-Kutta-Fehlberg algorithm. The numerical temperature fields T(x, y) for the five binary gas mixtures He-Xe, He-N2, He-O2, He-CO2, He-CH4, He-CF4 and He-SF6 are channeled through the allied mean convection coefficient hmix/B varying with the molar gas composition w in proper w-domain [0, 1]. For the seven binary gas mixtures utilized, the allied mean convection coefficient hmix/B versus the molar gas composition w is graphed in congruous diagrams. At a low film temperature Tf = 300 K, the global maximum allied mean convection coefficient hmix,max/B = 85 is furnished by the He-SF6 gas mixture at an optimal molar gas composition wopt = 0.93. The global maximum allied mean convection coefficient hmix,max/B = 57 is supplied by pure methane gas SF6 (w = 1) at a high film temperature Tf = 1000 K instead of the He-SF6 gas mixture.

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Leshchinskaya, Alexandra. „A. Leshchinskaya. MICROWAVE WOOD CHIP TREATMENT USE IN CHEMICAL PULP MANUFACTURING (TECHNICAL-ECONOMIC ASSESMENT)“. In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9706.

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MICROWAVE WOOD CHIP TREATMENT USE IN CHEMICAL PULP MANUFACTURING (TECHNICAL-ECONOMIC ASSESMENT) A. Leshchinskaya Plekhanov Russian University of Economics. 36 Stremyannyy Pereulok, 115093 Moscow, Russia, e-mail: alixfl@mail.ru] Keywords: chemical pulping, microwave wood modification, pulp, softwood, wood chips. Large volumes of cellulose are produced from wood chips by chemical methods. Low permeability of many wood species causes problems in the chemical pulp industry. These include: very long cooking times, high chemical consumption, large material losses, high energy consumption, and environmental pollution. New microwave (MW) wood modification technology can provide an increase in wood permeability for liquids and gases, which solves many of these problems. The technology works by applying intensive MW power to green wood, which generates steam pressure within wood cells. High internal pressure destroys weak elements of wood structure, opens pores and forms micro and macro cracks. A several thousand-fold increase in wood permeability can be achieved in species previously found to be impermeable to liquids and gases. It allows a significant increase in the speed of pulp cooking and improves a production processes. The study of the technology showed radical potential improvements in the pulp industry through: increase in mill throughput significant reduction of chemical consumptionreduction of energy consumption • increase in pulp quality and yield improvement of environmental performance. Pulp manufacturing process includs timber chipping, microwave chip treatment, steaming, cooking, washing, and pulp making. The use of MW wood chip treatment in pulp mills with outputs of 50,000 to 500,000 air dry tons (ADT) per year requires MW equipment with power from 1000 to 10,000 kW. Economic modelling of this technology used in different pulp mill conditions allowed assessment of the effect of capital costs, electricity costs, labour costs and other cost components to specific total costs of MW chip processing. Economic assessment of MW technology application showed that specific costs of softwood chip processing at electricity costs of 0.08 - 0.12 US$/kWh are 25.4 -33.7 US$/ADT of pulp. Electricity costs form the most significant part of the total specific costs of MW processing and form 51-69% shear in the total specific costs. Under the same conditions capital costs form 15-20% shear, and labour costs form 5-18% shear of the total specific costs. The electricity cost increase from $0.04 to $0.24/kWh provides specific MW processing cost rise by 2.7 to 3.1 times at pulp mill output range 50,000 to 500,000 ADT/year. New technology use allows benefits up to 7 – 22 Mil US$ per year for pulp mills with output of more than 200,000 ADT/year. The technology can be used by pulp mills with batch and continuous digesting and is not limited by mill throughput. Ecological impacts and high economic advantages of this MW technology application in pulp and paper industry provide good opportunity for commercialisation.

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Gottlieb, Amos. „Optical measurement of blood gases: approaches, problems, and trends“. In OE/LASE '92, herausgegeben von Douglas R. Hansmann, Fred P. Milanovich, Gerald G. Vurek und David R. Walt. SPIE, 1992. http://dx.doi.org/10.1117/12.58283.

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Liu, Shengli, und Yongtu Liang. „Environmental Risk Analysis of Accidental Release From Onshore Oil Pipelines“. In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84617.

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Accidental releases of oil and oil products will cause extensive damage to environment, if timely and effective measures are not available. Predicting the consequences of spilled oil is of significant importance for emergency management. Although software for risk assessment of gas pipelines is very popular, few are available for hazardous liquid pipelines, due to the difference in behaviors of accidental releases of gases and liquids in the same situation. The major differences are that the spread of released oil is mainly affected by the topography of the land and may result in pollution of soil or waterways, while gas pipeline failure may form gas clouds or explosions and merely pose environmental pollution problems. An integrated model was developed in order to analyze the environmental consequences of spills from oil pipelines. The method presented in this paper allowed to predict the flow trajectory of released liquid from a pipeline and other relevant parameters, including the extent of spread of the oil and the proportion of release reaching any important location, such as a river, in any given topography. The methodology has been applied to a release, which occurred in Marshall, Michigan, in 2010. The results obtained are of the correct order of magnitude compared with realistic data. A case-study is presented and discussed to illustrate the features of the methodology. The results confirmed that the proposed model may be considered an important tool within a comprehensive approach to the management of risk related to onshore oil pipelines.

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da Silva, Marcelo Pinto, Roberto Dalledone Machado und João Elias Abdalla Filho. „ENRICHED METHODS ALLIED TO MODIFIED LOCAL GREEN'S FUNCTION METHOD FOR ELASTO STATIC PROBLEMS“. In XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering. Florianopolis, Brazil: ABMEC Brazilian Association of Computational Methods in Engineering, 2017. http://dx.doi.org/10.20906/cps/cilamce2017-0366.

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„Volume 2. Mechanics of Liquids and Gases“. In XII ALL-RUSSIAN CONGRESS ON FUNDAMENTAL PROBLEMS OF THEORETICAL AND APPLIED MECHANICS. Bashkir State University, 2019. http://dx.doi.org/10.22226/2410-3535-2019-congress-v2.

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Khamitsevich, A. R., A. A. Butko und L. A. Lipnitsky. „DEEP UTILIZATION OF BOILER’S SMOKE GASES ON WOOD BIOMASS“. In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2021. http://dx.doi.org/10.46646/sakh-2021-2-324-327.

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Berichte der Organisationen zum Thema "Gases and allied problems"

Duvvuru, Narasimha Reddy, und Venkatanarayana Motkuri. SRI Cultivation in Andhra Pradesh: Achievements, Problems and Implications for Greenhouse Gases and Work. Oxford University, 2013. http://dx.doi.org/10.35648/20.500.12413/11781/ii003.

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Foh, Stephen, N. Poonawala und J. Pritchett. PR-4-172-R01 Modeling of Mixing in Porous Media. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), November 1985. http://dx.doi.org/10.55274/r0011433.

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The objective of this work was to define potential problems for storage field operators who stored non-traditional (supplemental) gas supplies (imported LNG, synthetic natural gas, peakshaving gases, etc.) in reservoirs originally using natural gas from traditional sources. Findings indicated that changes in storage field performance could be expected, including changed field inventory, deliverability and base gas requirements. The degree to which supplemental and traditional gases mix in storage reservoirs was identified as the key issue with respect to accounting for and dealing with these changes. The development of a reservoir simulator capable of handling gas-phase mixing in porous media was recommended. Such a model should account for mixing due to gravity segregation and hydrodynamic dispersion.

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Solomon, Kip, und Troy Gilmore. Age Dating Young Groundwater. The Groundwater Project, 2023. http://dx.doi.org/10.21083/liiu2727.

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This book provides an overview of common tracer methods that can be used to estimate the age of young groundwater that recharged less than about 60 years ago. In this book, applications of tracers to address hydrogeologic problems are only mentioned briefly because such problems are the topic of the Groundwater Project Book titled Introduction to Isotopes and Environmental Tracers as Indicators of Groundwater Flow (Cook, 2020) which readers are encouraged to review. The dating tracer methods include tritium (3H), tritium/helium-3 (3H/3He), sulfur hexafluoride (SF6) and chlorofluorocarbons (CFCs). All these methods except 3H involve the occurrence and transport of dissolved gases and thus the basic concepts of dissolved gases are discussed in this book. The authors are hydrogeologists interested in solving both groundwater quality and quantity issues in a world in which the availability of high-quality groundwater is diminishing. The goal of this book is to inform researchers and policy makers about the concepts and underlying assumptions involved in groundwater dating methods with the aim of increasing the application of these powerful methods while informing readers of their inherent limitations.

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Noronha, S. Climate Change and Generation Zero – Analysing the 50/50 Campaign: A Communication for Social Change Approach. Unitec ePress, Dezember 2012. http://dx.doi.org/10.34074/ocds.12013.

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Climate change does not respect national boundaries or distinguish between big and small polluters. It is one of the truly global problems humanity faces today. In spite of this, there is a reluctance to believe in the existence of climate change even though the scientific consensus is that human influence bears much of the responsibility. In less than 200 years, human activity has increased the atmospheric concentration of greenhouse gases by some 50 percent relative to pre-industrial levels, leading to an increase in global temperatures. 1 Yet contrarian perspectives abound, given prominence by the media and promoted by fossil fuel lobbies. One such example is Dennis Avery and Fred Singer’s Unstoppable Global Warming: Every 1,500 Years, a book whose premise is that “human-emitted CO2 has played only a minor role” in contributing to climate change.

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Noronha, S. Climate Change and Generation Zero – Analysing the 50/50 Campaign: A Communication for Social Change Approach. Unitec ePress, Dezember 2012. http://dx.doi.org/10.34074/ocds.12013.

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