Energy band gap is fundamentally important for the properties of a solid. Most of a material’s behaviors, such as conductivity, optical transitions, or electronic transitions, depend on it. Any change of the energy band gap may significantly alter the material’s physical and chemical properties. Change of the energy band gap occurs when the size of a solid is reduced to the nanometer length scale. Germanium is a semiconductor element and it has indirect energy band gap when it is in its bulk structure. Its energy band gap changes from indirect gap to direct gap after its size reduced to the nanometer scale which is responsible to many novel properties of the material. In this research paper, I investigated dependence of energy band gap of germanium nanostructure (the case of quantum dot) on the size of the dot and the findings are in agreement with other theoretical and research results. Keywords: Energy gap; novel properties; size; nanometer scale; quantum dot DOI : 10.7176/APTA/77-01 Publication date :May 31 st 2019
{"title":"Determination of Size-Dependent Energy Bandgap of Germanium (Ge) nanostructure","authors":"Adem Beriso","doi":"10.7176/apta/77-01","DOIUrl":"https://doi.org/10.7176/apta/77-01","url":null,"abstract":"Energy band gap is fundamentally important for the properties of a solid. Most of a material’s behaviors, such as conductivity, optical transitions, or electronic transitions, depend on it. Any change of the energy band gap may significantly alter the material’s physical and chemical properties. Change of the energy band gap occurs when the size of a solid is reduced to the nanometer length scale. Germanium is a semiconductor element and it has indirect energy band gap when it is in its bulk structure. Its energy band gap changes from indirect gap to direct gap after its size reduced to the nanometer scale which is responsible to many novel properties of the material. In this research paper, I investigated dependence of energy band gap of germanium nanostructure (the case of quantum dot) on the size of the dot and the findings are in agreement with other theoretical and research results. Keywords: Energy gap; novel properties; size; nanometer scale; quantum dot DOI : 10.7176/APTA/77-01 Publication date :May 31 st 2019","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81208632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work embodies the results of the effect of the water soluble components on the radiative forcing of continental average aerosols, from aerosol data extracted from optical properties of aerosols and cloud (OPAC) 4.0 software package using FORTRAN program to model the effect of water soluble on optical depth, asymmetric parameter, scattering and absorption coefficients at the spectral range of (0.25-0.80µm) and at eight relative humidities (0%,50%,70%,80%,90%,95%,98% & 99%). The concentration of water soluble was varied while concentrations of water insoluble and soot were kept constant. The optical parameters were used to compute numerically the radiative forcing using the concept of chylek and wong, the Angstrom exponent (α), turbidity (β) and Curvature ....... Keywords: Angstrom exponent, Curvature, Optical depth, Radiative forcing, Turbidity. DOI: 10.7176/APTA/79-04 Publication date:September 30th 2019
{"title":"The Effect of Varying Water Soluble Components on the Radiative Forcing of Continental Average Aerosols","authors":"B. Tijjani, M. Muhammad, R. Ahmad","doi":"10.7176/apta/79-04","DOIUrl":"https://doi.org/10.7176/apta/79-04","url":null,"abstract":"This work embodies the results of the effect of the water soluble components on the radiative forcing of continental average aerosols, from aerosol data extracted from optical properties of aerosols and cloud (OPAC) 4.0 software package using FORTRAN program to model the effect of water soluble on optical depth, asymmetric parameter, scattering and absorption coefficients at the spectral range of (0.25-0.80µm) and at eight relative humidities (0%,50%,70%,80%,90%,95%,98% & 99%). The concentration of water soluble was varied while concentrations of water insoluble and soot were kept constant. The optical parameters were used to compute numerically the radiative forcing using the concept of chylek and wong, the Angstrom exponent (α), turbidity (β) and Curvature ....... Keywords: Angstrom exponent, Curvature, Optical depth, Radiative forcing, Turbidity. DOI: 10.7176/APTA/79-04 Publication date:September 30th 2019","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"23 2 Suppl 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78323744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The charge on a charged particle is the energy created by its revolution around its axis or its spin, this explains the charge on the electron or the proton. It is well known that the two energies or charges of these two particles are equal in magnitude and opposite in direction or sign, why? because the ratio between electron's revolution squared velocity and proton's revolution one is the same as the ratio between the mass of the proton measuring to the mass of electron , thus each has the same energy or charge. In the same time, these two charges are the equal and opposite halves of the circular motion of the electron around the proton in the hydrogen atom, the smallest and basic astronomical system in the universe. DOI : 10.7176/APTA/80-05 Publication date :October 31 st 2019
{"title":"The Spin is the Origin of the Charge on a Charged Particle","authors":"S. Eid","doi":"10.7176/apta/80-05","DOIUrl":"https://doi.org/10.7176/apta/80-05","url":null,"abstract":"The charge on a charged particle is the energy created by its revolution around its axis or its spin, this explains the charge on the electron or the proton. It is well known that the two energies or charges of these two particles are equal in magnitude and opposite in direction or sign, why? because the ratio between electron's revolution squared velocity and proton's revolution one is the same as the ratio between the mass of the proton measuring to the mass of electron , thus each has the same energy or charge. In the same time, these two charges are the equal and opposite halves of the circular motion of the electron around the proton in the hydrogen atom, the smallest and basic astronomical system in the universe. DOI : 10.7176/APTA/80-05 Publication date :October 31 st 2019","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75293143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.15406/paij.2018.02.00066
T. Kalanov
The correct scientific and critical analysis of the generally accepted foundations of classical mechanics is proposed. The methodological basis for the analysis is the unity of formal logic and of rational dialectics. The main results of the analysis are as follows: (1) the correct starting point of kinematics is formulated: the informational definition of the concept of time; definitions of the concepts of motion, speed, and acceleration of material point in the metric system of coordinates; the principle of motion of quantum particle (photon); proof of the mathematical, physical, and formal-logical erroneousness (fallaciousness) of Lorentz transformations; (2) the correct starting point of dynamics is formulated: the definition of force as a physical property of the structure of the system of the interacting objects; (3) the correct starting point of the theory of gravitation is formulated: the condition of existence of the gravitational interaction which represents the condition of existence of the region of overlap (superposition, intersection) of the gravitational fields of the material objects; (4) the correct formulation of the law of gravitation within the framework of the system approach is given (the formulation represents the system of the proportions); (5) it is proved that the formulation of Newton’s empirical law of gravitation represents the formal-logical and dialectical errors. Keywords : general physics, special relativity, quantum mechanics, classical mechanics, formalisms in classical mechanics, Newtonian mechanics, post-Newtonian approximation, gravity, philosophy of science, history of science. PACS: 01.55.+b, 01.65.+g, 01.70.+w, 02.90.+p, 03.30.+p, 03.65.-w, 04.25.Nx, 45.05.+x, 45.20.-d, 45.20.D-
{"title":"On the Correct Formulation of the Starting Point of Classical Mechanics","authors":"T. Kalanov","doi":"10.15406/paij.2018.02.00066","DOIUrl":"https://doi.org/10.15406/paij.2018.02.00066","url":null,"abstract":"The correct scientific and critical analysis of the generally accepted foundations of classical mechanics is proposed. The methodological basis for the analysis is the unity of formal logic and of rational dialectics. The main results of the analysis are as follows: (1) the correct starting point of kinematics is formulated: the informational definition of the concept of time; definitions of the concepts of motion, speed, and acceleration of material point in the metric system of coordinates; the principle of motion of quantum particle (photon); proof of the mathematical, physical, and formal-logical erroneousness (fallaciousness) of Lorentz transformations; (2) the correct starting point of dynamics is formulated: the definition of force as a physical property of the structure of the system of the interacting objects; (3) the correct starting point of the theory of gravitation is formulated: the condition of existence of the gravitational interaction which represents the condition of existence of the region of overlap (superposition, intersection) of the gravitational fields of the material objects; (4) the correct formulation of the law of gravitation within the framework of the system approach is given (the formulation represents the system of the proportions); (5) it is proved that the formulation of Newton’s empirical law of gravitation represents the formal-logical and dialectical errors. Keywords : general physics, special relativity, quantum mechanics, classical mechanics, formalisms in classical mechanics, Newtonian mechanics, post-Newtonian approximation, gravity, philosophy of science, history of science. PACS: 01.55.+b, 01.65.+g, 01.70.+w, 02.90.+p, 03.30.+p, 03.65.-w, 04.25.Nx, 45.05.+x, 45.20.-d, 45.20.D-","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"44 1","pages":"27-46"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80047794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The structural and electronic properties of NdBi from an electronic structure calculation have been presented. The calculation is performed using self-consistent tight binding linear muffin tin orbital (TB-LMTO) method within the local density approximation (LDA). The calculated equilibrium structural parameters are in good agreement with the available experimental results. It is found that this compound shows metallic behavior under ambient condition and undergoes a structural phase transition from the NaCl structure to the CsCl structure at the pressure 20.1 GPa. The electronic structures of NdBi under pressure are investigated. It is found that NdBi have metalliation and the hybridizations of atoms in NdBi under pressure become stronger. Keywords: Phase transition, bulk modulus, band structure, density of states.
{"title":"Structural Phase Transition and Electronic Properties of NdBi","authors":"A. Sahu, R. Bhardwaj, A. Jain, S. Sanyal","doi":"10.1063/1.4917601","DOIUrl":"https://doi.org/10.1063/1.4917601","url":null,"abstract":"The structural and electronic properties of NdBi from an electronic structure calculation have been presented. The calculation is performed using self-consistent tight binding linear muffin tin orbital (TB-LMTO) method within the local density approximation (LDA). The calculated equilibrium structural parameters are in good agreement with the available experimental results. It is found that this compound shows metallic behavior under ambient condition and undergoes a structural phase transition from the NaCl structure to the CsCl structure at the pressure 20.1 GPa. The electronic structures of NdBi under pressure are investigated. It is found that NdBi have metalliation and the hybridizations of atoms in NdBi under pressure become stronger. Keywords: Phase transition, bulk modulus, band structure, density of states.","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"16 1","pages":"19-23"},"PeriodicalIF":0.0,"publicationDate":"2015-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78104252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-01-01DOI: 10.18488/JOURNAL.75/2015.2.2/75.2.10.19
E. Ibrahim, W. Parnadi
Study on Ground-penetrating radar (GPR) data from a common-offset profiling measurement carried out in the contact area between Panosogan and Waturanda Formations in Karangsambung, Kebumen – Central of Java is done. GPR RAMAC system is utilized. The aim of the study is to recognize and eliminate surface-scattering noise and ring-down effects, to image subsurface layered structure and to identify a contact area between Panosogan and Waturanda Formations. The processed data were analyzed with the help of instantaneous attributes and the so-called joint time frequency (JTFA) analysis. Study results show that some diffraction patterns appeared in radargram are resulting from scattering of surface-objects. These can be eliminated with f-k filtering and migration. Ring-down effect resulted from impedance mismatch between subsurface electrical properties and those of antenna is difficult to eliminate. However, it can be well recognized and analyzed in the JTF representation. Instantaneous attributes and JTF analysis are proved to be useful tools in imaging the contact area and subsurface layered structures.
{"title":"Study of Layered Structure on Contact Boundary Area of Formation Panasogan-Waturanda by Applying Ground Penetrating Radar Method","authors":"E. Ibrahim, W. Parnadi","doi":"10.18488/JOURNAL.75/2015.2.2/75.2.10.19","DOIUrl":"https://doi.org/10.18488/JOURNAL.75/2015.2.2/75.2.10.19","url":null,"abstract":"Study on Ground-penetrating radar (GPR) data from a common-offset profiling measurement carried out in the contact area between Panosogan and Waturanda Formations in Karangsambung, Kebumen – Central of Java is done. GPR RAMAC system is utilized. The aim of the study is to recognize and eliminate surface-scattering noise and ring-down effects, to image subsurface layered structure and to identify a contact area between Panosogan and Waturanda Formations. The processed data were analyzed with the help of instantaneous attributes and the so-called joint time frequency (JTFA) analysis. Study results show that some diffraction patterns appeared in radargram are resulting from scattering of surface-objects. These can be eliminated with f-k filtering and migration. Ring-down effect resulted from impedance mismatch between subsurface electrical properties and those of antenna is difficult to eliminate. However, it can be well recognized and analyzed in the JTF representation. Instantaneous attributes and JTF analysis are proved to be useful tools in imaging the contact area and subsurface layered structures.","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"29 1","pages":"10-19"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87138735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Ignatov, O. Mosin, H. Niggli, Christos Drossinakis
This paper presents the results of evaluation of possible biophysical methods and approaches for registering various non-ionizing radiation (NIR) wave types of the human body in the electromagnetic range. Many types of NIR (electromagnetic waves, infrared radiation, thermo radiation, bioluminescence) emitted from the human body were reviewed. In particular the results of spontaneous biophoton emission and delayed luminescence from the human body are submitted along with i nfrared thermography (IRT) results. It was shown that 1 cm 2 of skin generally emits ~85 photones for 1s. The intensity of biophoton emission ranges from 10 ?19 to 10 ?16 W/cm 2 (approx. ~1–1000 photons . cm -2. s -1 ). The specific photon emission from part of the human thumb was detected as a spectrum of various colours with the method of Color coronal spectral analysis on a device with an electrode made ??of polyethylene terephthalate (PET hostafan) with applied electric voltage of 15 kV, electric impulse duration 10 ms, and electric current frequency 15 kHz. It was established that photons corresponding to a red color emission of the visible electromagnetic spectrum have energy at 1.82 ?V. The orange color of the visible electromagnetic spectrum has energy at 2.05, yellow – 2.14, blue-green (cyan) – 2.43, blue – 2.64, and violet – 3.03 eV. The reliable result measurement norm was at E ? 2.53 eV, while the spectral range of the emission was within 380–495 nm and 570–750 nm±5 nm. Some important physical characteristics were also demonstrated (energy of hydrogen bonds, wetting angle, surface tension) of water by the methods of non-equilibrium energy (NES) and differential non-equilibrium energy (DNES) spectrum of water, that helps understand in general how electromagnetic radiation interacts with water and establishes the structural alterations of water. Keywords: electromagnetic waves, infrared radiation, thermo radiation, bioluminescence, color coronal spectral analysis, NES, DNES
{"title":"Evaluating Possible Methods and Approaches for Registering of Electromagnetic Waves Emitted from the Human Body","authors":"I. Ignatov, O. Mosin, H. Niggli, Christos Drossinakis","doi":"10.13187/EJNR.2014.2.96","DOIUrl":"https://doi.org/10.13187/EJNR.2014.2.96","url":null,"abstract":"This paper presents the results of evaluation of possible biophysical methods and approaches for registering various non-ionizing radiation (NIR) wave types of the human body in the electromagnetic range. Many types of NIR (electromagnetic waves, infrared radiation, thermo radiation, bioluminescence) emitted from the human body were reviewed. In particular the results of spontaneous biophoton emission and delayed luminescence from the human body are submitted along with i nfrared thermography (IRT) results. It was shown that 1 cm 2 of skin generally emits ~85 photones for 1s. The intensity of biophoton emission ranges from 10 ?19 to 10 ?16 W/cm 2 (approx. ~1–1000 photons . cm -2. s -1 ). The specific photon emission from part of the human thumb was detected as a spectrum of various colours with the method of Color coronal spectral analysis on a device with an electrode made ??of polyethylene terephthalate (PET hostafan) with applied electric voltage of 15 kV, electric impulse duration 10 ms, and electric current frequency 15 kHz. It was established that photons corresponding to a red color emission of the visible electromagnetic spectrum have energy at 1.82 ?V. The orange color of the visible electromagnetic spectrum has energy at 2.05, yellow – 2.14, blue-green (cyan) – 2.43, blue – 2.64, and violet – 3.03 eV. The reliable result measurement norm was at E ? 2.53 eV, while the spectral range of the emission was within 380–495 nm and 570–750 nm±5 nm. Some important physical characteristics were also demonstrated (energy of hydrogen bonds, wetting angle, surface tension) of water by the methods of non-equilibrium energy (NES) and differential non-equilibrium energy (DNES) spectrum of water, that helps understand in general how electromagnetic radiation interacts with water and establishes the structural alterations of water. Keywords: electromagnetic waves, infrared radiation, thermo radiation, bioluminescence, color coronal spectral analysis, NES, DNES","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"51 1","pages":"15-33"},"PeriodicalIF":0.0,"publicationDate":"2014-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78604125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-01-01DOI: 10.18488/JOURNAL.75/2014.1.1/75.1.34.41
Akpata Erhieyovwe, Enaibe A. Edison, S. Iyayi
The surface energies of the low index (100), (110) and (111) planes of some bcc alkali metals (Li,Na,K,Rb,Cs) and for the bcc transition metals (Fe,W,Mo,Cr,Ta,Nb and V) have been calculated using the Modified Analytical Embedded Atom Method (MAEAM).The surface energy of each (hkl) plane in alkali metals was found to be much more lower than those of the transition metals. The experimental values of surface energies are not tied to specific surfaces and are obtained for polycrystalline materials. They do not correlate with computed values published for any of these surfaces. This is expected since experiments give direct results. For all bcc metals the order of the surface energy is such that Es(110)
{"title":"Comparison of Surface Energy of Bcc Alkali Metals and Transition Metals Using Maeam","authors":"Akpata Erhieyovwe, Enaibe A. Edison, S. Iyayi","doi":"10.18488/JOURNAL.75/2014.1.1/75.1.34.41","DOIUrl":"https://doi.org/10.18488/JOURNAL.75/2014.1.1/75.1.34.41","url":null,"abstract":"The surface energies of the low index (100), (110) and (111) planes of some bcc alkali metals (Li,Na,K,Rb,Cs) and for the bcc transition metals (Fe,W,Mo,Cr,Ta,Nb and V) have been calculated using the Modified Analytical Embedded Atom Method (MAEAM).The surface energy of each (hkl) plane in alkali metals was found to be much more lower than those of the transition metals. The experimental values of surface energies are not tied to specific surfaces and are obtained for polycrystalline materials. They do not correlate with computed values published for any of these surfaces. This is expected since experiments give direct results. For all bcc metals the order of the surface energy is such that Es(110)","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"60 6 Suppl 1","pages":"34-41"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89645254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-01-01DOI: 10.18488/JOURNAL.75/2014.1.2/75.2.48.62
M. C. Raju, B. Sagar, S. Varma, S. Venkataramana
An analytical study is carried out for an unsteady MHD two dimensional free convection flow of a viscous, incompressible, radiating, chemically reacting and radiation absorbing Kuvshinski fluid through a porous medium past a semi-infinite vertical plate. The dimensionless equations governing the flow are solved by simple perturbation technique. The expressions for velocity, temperature and concentration are derived. The influence of various material parameters on flow quantities are studied and discussed with the help of graphs. The expressions for Skin friction, Nusselt number and Sherwood number are also derived and discussed numerically. Temperature increases with an increase in radiation parameter and radiation absorption parameter where as it decreases with an increase in Prandtl number. Concentration is observed to be decreased when chemical reaction parameter and Schmidt number increase.
{"title":"UNSTEADY MHD FREE CONVECTION BOUNDARY LAYER FLOW OF RADIATION ABSORBING KUVSHINSKI FLUID THROUGH POROUS MEDIUM","authors":"M. C. Raju, B. Sagar, S. Varma, S. Venkataramana","doi":"10.18488/JOURNAL.75/2014.1.2/75.2.48.62","DOIUrl":"https://doi.org/10.18488/JOURNAL.75/2014.1.2/75.2.48.62","url":null,"abstract":"An analytical study is carried out for an unsteady MHD two dimensional free convection flow of a viscous, incompressible, radiating, chemically reacting and radiation absorbing Kuvshinski fluid through a porous medium past a semi-infinite vertical plate. The dimensionless equations governing the flow are solved by simple perturbation technique. The expressions for velocity, temperature and concentration are derived. The influence of various material parameters on flow quantities are studied and discussed with the help of graphs. The expressions for Skin friction, Nusselt number and Sherwood number are also derived and discussed numerically. Temperature increases with an increase in radiation parameter and radiation absorption parameter where as it decreases with an increase in Prandtl number. Concentration is observed to be decreased when chemical reaction parameter and Schmidt number increase.","PeriodicalId":7386,"journal":{"name":"Advances in Physics Theories and Applications","volume":"24 1","pages":"48-62"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85920242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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