Thematische Bibliographien / MIXED SOLVENT MEDIA

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Auswahl der wissenschaftlichen Literatur zum Thema „MIXED SOLVENT MEDIA“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "MIXED SOLVENT MEDIA"

A. Mohammed, Abdul-Halim, und Mohammed J. Yass Kheder. „The Effect of Extraction Temperature and Solvent to Oil Ratio on Viscosity Index of Mixed-medium Lubricating Oil Fraction by Using Solvents Extraction“. Iraqi Journal of Chemical and Petroleum Engineering 10, Nr. 2 (30.06.2009): 13–18. http://dx.doi.org/10.31699/ijcpe.2009.2.3.

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In this study two types of extraction solvents were used to extract the undesirable polyaromatics, the first solvent was furfural which was used today in the Iraqi refineries and the second was NMP (N-methyl-2-pyrrolidone).The studied effecting variables of extraction are extraction temperature ranged from 70 to 110°C and solvent to oil ratio in the range from 1:1 to 4:1.The results of this investigation show that the viscosity index of mixed-medium lubricating oil fraction increases with increasing extraction temperature and reaches 107.82 for NMP extraction at extraction temperature 110°C and solvent to oil ratio 4:1, while the viscosity index reaches to 101 for furfural extraction at the same extraction temperature and same solvent to oil ratio. The increase in solvent to oil ratio has a higher effect on increasing the viscosity index of lubricating oil fraction compared with extraction temperature in furfural and NMP extraction.Further more, the results show that the percentage yield of raffinate was decreased as the extraction temperature and solvent to oil ratio increases for furfural and NMP extraction.

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Vincent, Brian. „Dispersion stability in mixed solvent (aqueous/organic) media“. Advances in Colloid and Interface Science 42 (Oktober 1992): 279–302. http://dx.doi.org/10.1016/0001-8686(92)80025-s.

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Yadav, Chandradip Kuma. „A Comparative Study of Conductance of Sodium Dodecyle Sulphate (SDS) in Different Percentage of Ethanol Water Mixed Solvent Media at 298.15 K Temperature“. NUTA Journal 5, Nr. 1-2 (31.12.2018): 67–71. http://dx.doi.org/10.3126/nutaj.v5i1-2.23459.

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Precise measurement of the conductivity of sodium dodecyl sulphate in different percentage of (0%, 10%, 20%) ethanol-water mixed solvent media containing at 298.15 K temperature were measured. The specific conductivities exhibit a sharp increase with increase in concentration with in the concentration range investigated (0.001 to 0.020) mol per liter. The increase in the conductance with concentration is due to an increase in the number of ion per unit volume of the solution. But decrease in conductance with increase in percentage of ethanol - water mixed solvent media at particular temperature 298.15 K. Ionizing effect is decrease with increase in percentage of ethanol - water mixed solvent media at 298.15K. Due to decrease in dielectric constant with increase in percentage of ethanol - water mixed solvent media at particular temperature 298.15 K. conductivity order is 0% > 10% > 20% at particular temperature 298.15 K.

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Bhattarai, Ajaya, Kavita Pathak und Bikash Dev. „Micellization behavior of mixed surfactants in pure water and methanol-water mixed solvent media by density methods“. BIBECHANA 13 (03.12.2015): 114–20. http://dx.doi.org/10.3126/bibechana.v13i0.13887.

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The properties of anionic-rich and cationic-rich mixtures of dodecyltrimethylammonium bromide (DTAB) and sodium dodecylsulfate (SDS) in pure water and methanol-water mixed solvent media were studied using density measurements at room temperature. The results showed that density increases with increasing concentration of surfactant mixture over the entire concentration range investigated in pure water and in the given mixed solvent media and which are found to decrease with an increase in the volume fraction of methanol in the solvent composition. The critical micelle concentration increases with the increase in volume fraction of methanol for both the anionic-rich (SDS-DTAB) and cationic-rich (DTAB-SDS) systems.BIBECHANA 13 (2016) 114-120

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Basnet, Nabin, und Ajaya Bhattarai. „Conductometric study of nickel chloride in ethanol-water mixed solvent media at various temperatures“. BIBECHANA 12 (20.12.2014): 128–34. http://dx.doi.org/10.3126/bibechana.v12i0.11789.

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The conductivity measurement of nickel chloride has been done in binary solvent of the ethanol-water system. The different percentage of ethanol including 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 (v/v) has been chosen as binary solvents. The concentration of the electrolyte in the prepared solutions varies from 0.008 to 0.1 mol.l-1 for temperatures 298.15 K, 303.15 K and 308.15 K. The conductivity of the electrolyte decreases with increase in ethanol content in the solvent at a particular temperature, which is due to the decrease in dielectric constant of the medium. The conductivity increases with increase in temperature and concentration, due to increase in mobility of ions and number of ions from observed electrolyte respectively. DOI: http://dx.doi.org/10.3126/bibechana.v12i0.11789BIBECHANA 12 (2015) 128-134

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Pathak, Raghvendu. „Solvation enthalpy of uranium tetrachloride in aqueous-alcohols mixed solvents“. Science Vision 17, Nr. 3 (30.09.2017): 122–27. http://dx.doi.org/10.33493/scivis.17.03.01.

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The process of interaction between ions of a solute and the molecules of the solvent through relatively weak covalent bonds is called solvation. It involves evening out a concentration gradient and evenly distributing the solute molecules within the solvent. Hydration is a special case of solvation when the solvent molecules are water. Solvation energy, generally, is the energy released when ions in crystal lattices associate with molecules in a solvent, however it can be positive or negative, depending upon the combined effects of lattice and hydration energies in case of aqueous-ionic solid dissolution. Uranous chloride or uranium tetrachloride (UCl4) is a green crystalline solid which sublimes in vacuum at 500°C/10-3 mm. It is a Lewis acid and hence dissolves in solvents which can act as non-protic Lewis bases. Although dissolution of uranium tetrachloride crystals in water is an exothermic process yielding a green solution which is fairly stable in the cold, yet is hydrolyzed to a considerable extent to furnish an acidic reaction. Solvation enthalpies of quadrivalent uranium system have been scantly reported. The present communication deals with the calculation of enthalpy of solution of uranium tetrachloride in aqueous-non-aqueous solvent mixtures, particularly in 10 and 20 weight (wt) % methyl alcohol-water and ethyl alcohol-water systems at 25°C calorimetrically and thereby estimating the solvation enthalpy of UCl4 in the said media.

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Lalitha, Punchayil Velayudhan Nair, und Renganathan Ramaswamy. „A Novel Approach to the Study of Briggs-Rauscher Reaction“. Collection of Czechoslovak Chemical Communications 57, Nr. 11 (1992): 2235–40. http://dx.doi.org/10.1135/cccc19922235.

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The Briggs-Rauscher reaction with substrates containing acidic hydrogen such as malonic acid, acetonyl acetone has been studied. The employment of mixed media involving an organic solvent and water enabled the study of water-insoluble substrates. The present communication reports the oscillatory behaviour of malonic acid in the iodate system in different mixed media (5 vol.% of the organic solvent) as well as the oscillatory behaviour of seven substrates in acetonitrile-water mixed medium of which two are new substrates hitherto unreported in any of the oscillatory systems.

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Shah, Sujit Kumar, Sujeet Kumar Chatterjee und Ajaya Bhattarai. „Micellization of cationic surfactants in alcohol — water mixed solvent media“. Journal of Molecular Liquids 222 (Oktober 2016): 906–14. http://dx.doi.org/10.1016/j.molliq.2016.07.098.

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Yadav, Chandradip Kumar, und Brahamdeo Yadav. „Effect of Ethanol on Critical Micelle Concentration of Sodium Dodecylsulphate in Mixed Solvent Media at 308.15K by Conductometric Measurement“. Orchid Academia Siraha 1, Nr. 1 (31.12.2022): 91–102. http://dx.doi.org/10.3126/oas.v1i1.52151.

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The conductivity measurement of sodium dodecyl sulphate (SDS)in mixed solvent media was investigated. The results indicated that sharp increase with the increase in concentration and temperature of sodium dodecyl sulphate the critical micelle concentration (CMC) decreased with the amount of ethanol increase which can be explained based on the nature of solvent mixed media and inter ionic attraction of ions. The graph of conductance versus concentration is used to determine the critical micelle concentration (CMC).

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Das, Bijan. „Thermodynamics of electrolytes in mixed solvent media Application of the Pitzer ion interaction approach“. Canadian Journal of Chemistry 83, Nr. 12 (01.12.2005): 2032–38. http://dx.doi.org/10.1139/v05-222.

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Although for a long time considerable attention has been paid to the application of the Pitzer ion interaction approach to describe the thermodynamic properties of a variety of aqueous electrolyte solutions, such studies in mixed solvent media are still scarce. The present paper discusses the application of the Pitzer ion interaction approach in the case of electrolyte solutions in mixed solvent media. In particular, a comprehensive equation for the thermodynamic properties of hydrochloric acid in dioxanewater mixtures within the temperature range 273.15 to 323.15 K has been generated in the ion interaction (Pitzer) equation form on the basis of electrochemical cell measurements of the hydrochloric acid available in the literature. It was necessary to set varying values of the exponential coefficients α1 and α2 of the standard Pitzer model in different mixed solvent media to achieve a satisfactory fit. The present model quantitatively reproduces the experimental cell electromotive forces over the entire concentration and temperature range used for the experiments. The Pitzer ion interaction approach is, thus, proved to be a very valuable method for the correlation and prediction of thermodynamic properties of electrolytes in mixed solvent media. The implications of the Pitzer ion interaction parameters (β(0), β(1) β(2), and Cϕ) have also been discussed in terms of interionic forces. The present study also stresses the need for additional emf measurements to help interpolation through the dioxane composition. Key words: Pitzer's equations, Pitzer ion interaction parameter, activity coefficients, emf, hydrochloric acid.

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Mehr Quellen

Dissertationen zum Thema "MIXED SOLVENT MEDIA"

Bhattarai, Ajaya. „Polyelectrolyte-surfactant interactions in mixed solvent media“. Thesis, University of North Bengal, 2010. http://hdl.handle.net/123456789/1321.

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Choudhury, Ankan. „Physico-chemical investigation of solute-solute, solute-solvent and solvent-solvent interactions of some compounds in non-aqueous and mixed solvent media“. Thesis, Th 541.34:C552p, 2005. http://hdl.handle.net/123456789/704.

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Nandi, Prabir. „Solution properties of sodium carboxymethylcellulose in acetonitrile-water mixed solvent media“. Thesis, University of North Bengal, 2009. http://hdl.handle.net/123456789/1350.

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Chatterjee, Amritendu. „Solution properties of sodium carboxymethylcellulose in methanol-water mixed solvent media“. Thesis, University of North Bengal, 2012. http://hdl.handle.net/123456789/1573.

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Brahman, Dhiraj. „PHYSICO-CHEMICAL STUDIES OF SOME SCHIFF BASE COMPLEXES OF TRANSITION METALS IN PURE AND MIXED SOLVENT MEDIA“. Thesis, University of North Bengal, 2013. http://hdl.handle.net/123456789/973.

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De, Ranjit. „Solution properties of sodium polystyrene sulphonate in 2-ethoxyethanol-water mixed solvent media“. Thesis, University of North Bengal, 2011. http://hdl.handle.net/123456789/1435.

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Paul, Chowdhury Madhurima. „Physicochemical studies on double-chain amphiphiles and their aggregation behavior in different media“. Thesis, University of North Bengal, 2018. http://ir.nbu.ac.in/handle/123456789/2692.

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Buchteile zum Thema "MIXED SOLVENT MEDIA"

SHIBATA, J., M. SANO und S. NISHIMURA. „Extraction of Metal Ions from Mixed Aqueous-Organic Media with Liquid-Liquid Extraction and Ion Exchange Resin“. In Solvent Extraction 1990, Part B, 1169–74. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-88677-4.50014-3.

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Koujalagi, Prasanna S. „An Experimental Study on Removal of Hexavalent Chromium from Water and Organic Solvent Mixed Media by Adsorption Using Weak Base Anion Exchanger Tulsion A-2X (MP)“. In Current Perspectives on Chemical Sciences Vol. 7, 79–88. Book Publisher International (a part of SCIENCEDOMAIN International), 2021. http://dx.doi.org/10.9734/bpi/cpcs/v7/6904d.

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Baporikar, Neeta. „Challenges for Social Enterprises in Special Education“. In Strategic Marketing for Social Enterprises in Developing Nations, 269–91. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7859-8.ch011.

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Social entrepreneurship is a rapidly growing discipline that is attracting the interest of governments, researchers, media, and organizations. Social enterprises have the ability to impact nations economically, environmentally, and socially by solving most pressing problems such as poverty, hunger, pollution, and education to name but a few through provision of their innovative products and services. So, in order for social enterprises including special schools to function effectively and efficiently, deliver innovative and quality services, and achieve their goals, they need sufficient sources and funding. Many researchers also cite that lack of funding is one of the greatest challenges and this is further aggravated due to lack of proper marketing of their services. Hence, adopting an exploratory research design and mixed method approach, the objective of this chapter is to apprehend the challenges of social enterprises in special education with a focus on schools, especially in emerging economies.

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Khanifar, Ahmad, und Mansoor Zoveidavianpoor. „Core Flooding Application in EOR WAG Implementation: The Impact of Asphaltene Precipitation and Deposition“. In Innovations in Enhanced and Improved Oil Recovery- New Advances [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1004196.

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Pressure depletion, temperature changes, and injection of CO2 or solvents into reservoirs can induce asphaltene precipitation and deposition in porous media. The dynamic displacement efficiency of a water alternating gas (WAG) process is controlled by relative permeability. Asphaltene deposition may alter the original characteristics of relative permeability curves. In this study, the effects of asphaltene deposition on the three-phase relative permeability using dynamic displacement experiments are investigated. A synthetic experimental approach is used to simulate the effect of in situ asphaltene deposition on the three-phase relative permeability of a water-wet system. Independent core flooding experiments are conducted on the different core-plug samples. The experimental results show that the asphaltene deposition changes the system from water-wet to mixed-wet. However, the results for the gas-oil system indicate it does not have a significant effect on gas-oil relative permeability. The oil relative permeability in a three-phase system shows different trajectories for oil iso-perm with different levels of asphaltene deposition until a certain gas saturation is achieved. Beyond this saturation point, all oil iso-perm trajectories merge, indicating no significant effect of asphaltene deposition. Understanding the impact of asphaltene precipitation and deposition in WAG application can provide valuable insights for optimizing enhanced oil recovery strategies.

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Sajja, Priti Srinivas. „Personalized Content Representation through Hybridization of Mobile Agent and Interface Agent“. In Ubiquitous Multimedia and Mobile Agents, 85–112. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-61350-107-8.ch004.

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Mobile agent has an ability to co-operate with heterogeneous network environment. There are specific predefined techniques to impart mobility to an agent. As a result, the agent behaves only in predefined way. To impart other features beside mobility that helps in interfacing the destination network to complete the intended job, a mobile agent need to be incorporated with additional functionalities. One of such functionalities is ability to access local user profiles, preferences, and other resources as well as other local agents to present information in user’s context. To meet this demand, hybridization of mobile and interface agent that facilitates development of customized application is discussed in this chapter. The multi-agent architecture, described in this chapter, encompasses this hybrid agent to access user profile and fuzzy indicator matrix. Both the profile and matrix are further utilized to construct content preference list according to users’ perspectives. The indicator matrix enlists typical interest and preferences of a group, such as purpose of surfing/using the system (research, teaching, learning, problem solving, etc.); level information needed (highly technical, conceptual, mixed, etc.), media preference (type of document such as text, code, video, etc.). The system is designed as multi-tier structure called resource tier, service tier, and application tier to provide resources, third party services, and application support to learners, instructors, and administrator groups. The chapter utilizes the proposed generic multi tier architecture for a personalized learning (p-Learning) system and discusses its design in detail including working of different agents, mobility and ticket management, user profile structure, and risk management policies. The chapter concludes with discussion on results and future research directions.

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Konferenzberichte zum Thema "MIXED SOLVENT MEDIA"

Pratama, Randy Agra, und Tayfun Babadagli. „What is Next for SAGD?: Evaluation of Low GHG and High-Efficiency Tertiary Recovery Options“. In SPE Canadian Energy Technology Conference. SPE, 2022. http://dx.doi.org/10.2118/208876-ms.

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Abstract Steam injection has been widely applied in different forms to recover heavy-oil and bitumen for decades. Even though this method is a proven and effective technology, the steam generation process itself may lead to environmental issues and low economic viability. Also, many worldwide steam projects, including SAGD projects in Canada, have already reached their maturity with a severe decline in production despite continuous steam injection. Escalating greenhouse gas (GHG) emissions is another crucial downside of steam injection application, contributing to an emission growth rate of about 1.1% worldwide and 0.8% annually in Canada. This requires us to search for different techniques to deplete the remaining (conditioned) oil efficiently and in an eco-friendly manner. This paper focuses on the testing of a new technique to minimize GHG emissions resulting from steam generation while enhancing the ultimate recovery post-SAGD. ~50,000 cP heavy crude and processed oil (for visual models) samples were used as an oleic phase in this experimental research. Condensable gases as single and multiple (mixed with methane) components were included as potential solvents to be applied to the already steamed models. Visual Hele-Shaw and glass-bead-pack models were employed to investigate the displacement mechanism, displacement efficiency, and phase distribution in porous media. All experiments were performed at currently existing temperatures in matured SAGD reservoirs to further evaluate the sensitivity of phase behavior of condensable solvents in a heavy-oil/steam system, as well as existing condensed water of which is not compatible with hydrocarbon solvents. We observed that condensable solvents could improve the displacement efficiency/incremental heavy-oil recovery over 30% by mobilizing residual oil and providing favorable conformance to the steam chamber. More importantly, the steam usage was able to be entirely cut off, and the energy efficiency could be ramped up to almost 100%. Additionally, the type (and composition) for applying condensable solvents were determined at a given post-SAGD temperature. Also, the retrieval potential of the condensable solvent with oil was investigated for an efficient process. Condensable gases with different compositions were introduced as potential solvents to recuperate heavy-oil and bitumen recovery and reduce or even completely cut off the steam injection at late-stage SAGD, diminishing its GHG emission and improving energy efficiency. Valuable findings present beneficial recommendations for low-emission and high-efficiency late-stage heavy-oil recovery as post-SAGD applications, as well as other types of steam injection processes.

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Zade, Azad Q., Mehrdad T. Manzari und Siamak K. Hannani. „Compatible Numerical Schemes for Coupled Flow and Transport in Porous Media“. In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95662.

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In this paper, the compatibility of various combinations of numerical schemes for the solution of flow and transport equations in porous media is studied and the possible loss of accuracy and global mass conservation are investigated. Here, the flow equations are solved using three popular finite element methods including the Standard Galerkin (SG), Discontinuous Galerkin (DG) and Mixed Finite Element (MFE) methods among which only the DG method possesses the local conservation property. Besides, the transport of a scalar variable which is governed by a convection-diffusion equation is studied in conjunction with the flow equations. The transport equation is solved using both the Streamline Upwind Petrov-Galerkin (SUPG) and the DG methods. Two test cases are numerically solved using various combinations of methods in order to explore the compatibility of flow and transport solution algorithms. In each test case, the error in total mass conservation and the deviation from the exact solution are compared for various solver combinations.

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Tsao, Wen-Huai, Ying-Chuan Chen, Christopher E. Kees und Lance Manuel. „Response Mitigation of Floating Platform by Porous-Media Tuned Liquid Dampers“. In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79607.

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Abstract A porous-media tuned liquid damper (PMTLD) can serve as an eco-friendly, economical, and effective dynamic vibration absorber. Placing porous media within a water tank can improve the capacity for energy dissipation and optimize the performance by varying its material properties. The numerical simulations of the floating platform dynamics in waves coupled with the sloshing problem in PMTLD are emphasized. Two numerical methods are adopted for fluid computation. The first potential-based approach employs a mixed-type boundary value problem (BVP) solver, which is implemented by the boundary element method (BEM), coupled with a free surface particle tracker, which includes the nonlinear damping effects via a quadratic Forchheimer term for PMTLD. Another equivalent mechanical model is also used exclusively for solving the linear PMTLD. The coupling behavior between fluid and structure is solved by the Newmark method. The second viscous approach uses the finite element method (FEM) to spatially discretize the Navier-Stokes equations and handles the free surface via the volume of fluid (VOF) and the level set (LS) equations. The multiphase simulation is implemented by a computational modeling toolkit Proteus for the fluid phase and Chrono for the solid phase. The correlations between potential flow and Navier-Stokes (NS) models are presented. The PMTLD is designed for a floating platform by analogy with the tuned mass damper (TMD). Numerical results show that the PMTLD can effectively reduce the structure’s dynamic response in terms of vibration amplitude around resonance. Such damping devices have great potential for practical applications in offshore platforms and wind turbine design.

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Peng Cheng Wang, Xin Zhou Zhao, Wen Jie Chen und Mei Song Tong. „A mixed scheme for solving volume-surface integral equations with conducting-dielectric media“. In 2016 IEEE International Conference on Computational Electromagnetics (ICCEM). IEEE, 2016. http://dx.doi.org/10.1109/compem.2016.7588661.

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Baltaeva, Madina, Katerina Stamer und Maxim Orlov. „Complex Micro-Containers (CMC) Transporting Compartmentalized Reaction Mixture for Self-Healing Cement“. In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213702-ms.

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Abstract Zonal isolation and cement sheath integrity are vital for a consistent oil and gas production process in an economic and environmentally conscious manner. However, cement is a brittle material that can fail under repeated application of stresses. The objective of this research is developing a novel material Complex micro-containers (CMC) to induce autonomous self-healing properties to the cement using the mechanism of a self-expanding polyurethane foam formation in a crack area. Complex micro-containers (CMC) consist of polyol-loaded polyurea (PUa) micro- and nanocapsules loaded inside the isocyanate-filled core of larger polyurethane (PU) microcapsules. The method of CMC creation includes several steps. During the first step, an oil-in-oil emulsion, composed of organic solvent and polyol-polyamine solution, is created. The second step is made of a polyurea shell formation directly at the surface of the polyol droplets controlled by an addition of isocyanate. As the result of the interfacial polymerization process, micro- and nanocapsules are formed. Then, they are mixed with the isocyanate solution and further emulsified in the water-based media. The droplets of isocyanate with micro- and nanocapsules are encapsulated through polyurethane shell formation by adding polyol. A variety of factors alter the morphology and size of the micro- and nanocapsules including parameters of emulsion's creation, core/shell ratio, and dispersion speed. The optimal content of isocyanate and polyols in cores of polyurea and polyurethane microcapsules, mechanical mixing parameters, and concentration of emulsifiers in oil-in-oil and oil-in-water emulsions were determined. FTIR-spectroscopy was used to identify the chemical structure and to demonstrate encapsulation of the isocyanate core and the polyurethane shell and the polyol core and polyurea shells. TGA-analysis, optical microscopy, and scanning electron microscopy methods were used to determine the core content of micro- and nanocapsules and their size. The peeling strength test proved that the release of the microcapsules’ core content occurs by pressure application and the diisocyanate reacts with polyol and water and creates the polyurethane material. The main advantage of CMC is its expandable properties due to the formation of a polyurethane foam in the presence of water that can effectively fill the micro-cracks directly in a place of cement breakage. Integration of developed new material into the cement body will allow for improving a long-term wellbore isolation and mitigating a leakage potential in the cemented annuli.

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Sambo, Chico, und Yin Feng. „Physics Inspired Machine Learning for Solving Fluid Flow in Porous Media: A Novel Computational Algorithm for Reservoir Simulation“. In SPE Reservoir Simulation Conference. SPE, 2021. http://dx.doi.org/10.2118/203917-ms.

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Abstract The Physics Inspired Machine Learning (PIML) is emerging as a viable numerical method to solve partial differential equations (PDEs). Recently, the method has been successfully tested and validated to find solutions to both linear and non-linear PDEs. To our knowledge, no prior studies have examined the PIML method in terms of their reliability and capability to handle reservoir engineering boundary conditions, fractures, source and sink terms. Here we explored the potential of PIML for modelling 2D single phase, incompressible, and steady state fluid flow in porous media. The main idea of PIML approaches is to encode the underlying physical law (governing equations, boundary, source and sink constraints) into the deep neural network as prior information. The capability of the PIML method in handling reservoir engineering boundary including no-flow, constant pressure, and mixed reservoir boundary conditions is investigated. The results show that the PIML performs well, giving good results comparable to analytical solution. Further, we examined the potential of PIML approach in handling fluxes (sink and source terms). Our results demonstrate that the PIML fail to provide acceptable prediction for no-flow boundary conditions. However, it provides acceptable predictions for constant pressure boundary conditions. We also assessed the capability of the PIML method in handling fractures. The results indicate that the PIML can provide accurate predictions for parallel fractures subjected to no-flow boundary. However, in complex fractures scenario its accuracy is limited to constant pressure boundary conditions. We also found that mixed and adaptive activation functions improve the performance of PIML for modeling complex fractures and fluxes.

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Cui, X., und B. Q. Li. „Discontinuous Galerkin Method for Internal Thermal Radiation Problems“. In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42060.

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The internal thermal radiation phenomena are described by a first-order integral-differential equation, which poses an intrinsic problem for the popular diffusion-based Galerkin finite element method. By allowing for discontinuity across the internal inter-element boundaries, the finite element procedure can be adapted to solve the integral-differential equation. This paper discusses a numerical procedure based on the discontinuous Galerkin method for the solution of radiation heat transfer involving participating media. Detailed formulation using the discontinuous Galerkin method for internal radiation heat transfer calculations is given. The coupling of the method with the conventional finite element method for mixed heat transfer calculations is also presented.

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Hanák, Róbert. „Are Deliberative People More Consistent in Decision Making?“ In Applied Human Factors and Ergonomics Conference. AHFE International, 2019. http://dx.doi.org/10.54941/ahfe100187.

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The preference for intuition and deliberation scale (PID) as a cognitive style measure was used to investigate whether more deliberative participants (identified by self-report PID inventory) would also show higher motivation to properly and normatively solve a task designed to measure their inconsistency and discrimination to details (CWS Index). 161 (103 women) managers and administrative workers were asked to evaluate 21 fictional job candidates. The decision task was designed so that participants could work according to their preferences – everyone had enough time to analyse the logic behind the task. Significant differences were found among all four groups (deliberative, intuitive, both below median, both above median) in levels of inconsistency. Totally consistent respondents were significantly more likely to be from the deliberative and mixed (high in deliberation and in intuition) groups.

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Cheng, Chi-Cheng, und Yi-Fan Wu. „A Pedestrian Counting Scheme for Video Images“. In 3rd International Conference on Artificial Intelligence and Machine Learning (CAIML 2022). Academy and Industry Research Collaboration Center (AIRCC), 2022. http://dx.doi.org/10.5121/csit.2022.121211.

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Pedestrian counting aims to compute the numbers of pedestrians entering and leaving an area of interest based on object detection and tracking techniques. This paper proposes a simple and effective approach of pedestrian counting that can effectively solve the problem of pedestrian occlusion.Firstly, the moving objects are detected by the median filtering and foreground extraction with the improved mixed Gaussian model. And then the HOG (Histogram of oriented gradient) features detection and the SVM (Support vector machine) classification are applied to identify the pedestrians. A pedestrian dataset containing 1500 positive samples, 12000 negative samples, and 420 hard examples, which gave the false discriminant results with the initial classifier, also considered as negative samples to enhance classification capability is employed. In addition, the Kalman filtering with BLOB analysis for dynamic target tracking is chosen to predict pedestrian trajectory.This method greatly reduces the target misjudgment caused by overlapping and completes the two-way counting. Experiments on pedestrian tracking and counting in video images demonstrate promising performance with satisfactory recognition rate and processing time.

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Alan, Rifqi Kamal, und Istiyono Edi. „Analysis of numeracy ability test item characteristics grade VIII students with mixed model item response theory (IRT) approach“. In Challenges of Science. Institute of Metallurgy and Ore Beneficiation, 2023. http://dx.doi.org/10.31643/2023.22.

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Basic knowledge of mathematics is essential for solving problems contextually. Mathematics has a function for the development of the ability to calculate, measure, find, and use mathematical formulas that can provide students with an understanding of concepts related to life phenomena. One ability that is synonymous with understanding problems contextually is numeracy ability. Numeration has a main focus, namely the ability of students to formulate, apply, and be able to interpret mathematics in various contexts that include mathematical reasoning and using mathematical concepts, methods, facts, and auxiliary media, explaining, and predicting phenomena in everyday life. This study aims to determine the construct of numeracy ability test instruments for class VIII public junior high school students in Pekalongan Regency, determine the quality of numeracy ability test instruments for class VIII public junior high school students in Pekalongan Regency, and determine the numeracy ability profile of class VIII public junior high school students in Pekalongan Regency. This research method approaches quantitatively by developing instruments using CFA and IRT mixed models. This research was conducted at the junior high school level within the scope of the education office of Pekalongan Regency, Central Java Province, by taking 6 schools as samples. Content validity using Aiken V and Cronbach Alpha reliability as well as item characteristics with mixed IRT and descriptive analysis. The results of this study, namely (1) Construction of numeracy ability instruments for grade VIII State Junior High School students, which are related to the content of algebra, numbers, geometry, and measurement, as well as data and uncertainty. In addition, using personal, socio-cultural, and scientific contexts, using cognitive levels of understanding, application, and reasoning, (2) The quality of numeracy ability instruments is declared valid and reliable, and in construct validity all items are fit as seen from the Loading Factor Standardized Solution value of more than 0.3 and p-value < 0.05 and the reliability of the high category and the estimated characteristics of the items show that the question items are included in the category both in terms of difficulty, and (3) The numeracy ability of junior high school students in Pekalongan Regency shows that there are 36 students out of 599 students classified as proficient with a percentage of 6%, 139 students out of 599 students classified as proficient with a percentage of 23%, 390 students out of 599 students classified as basic with a percentage of 65%, and 34 students out of 599 students classified as needing special intervention with a percentage of 6%.

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