349 research outputs found
Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity
No full textIn the present research a simplified mathematical model for the solar thermal collectors is considered in the form of non-uniform unsteady stretching surface. The non-Newtonian Maxwell nanofluid model is utilized for the working fluid along with slip and convective boundary conditions and comprehensive analysis of entropy generation in the system is also observed. The effect of thermal radiation and variable thermal conductivity are also included in the present model. The mathematical formulation is carried out through a boundary layer approach and the numerical computations are carried out for Cu-water and TiO2-water nanofluids. Results are presented for the velocity, temperature and entropy generation profiles, skin friction coefficient and Nusselt number. The discussion is concluded on the effect of various governing parameters on the motion, temperature variation, entropy generation, velocity gradient and the rate of heat transfer at the boundary
An extension of the localist representation theory: grandmother cells are also widely used in the brain
No full textabstract: Based on considerable neurophysiological evidence, Roy (2012) proposed the theory that localist representation is widely used in the brain, starting from the lowest levels of processing. Grandmother cells are a special case of localist representation. In this article, I present the theory that grandmother cells are also widely used in the brain. To support the proposed theory, I present neurophysiological evidence and an analysis of the concept of grandmother cells. Konorski (1967) first predicted the existence of grandmother cells (he called them “gnostic” neurons)—single neurons that respond to complex stimuli such as faces, hands, expressions, objects, and so on. The term “grandmother cell” was introduced by Jerry Lettvin in 1969 (Barlow, 1995).View the article as published at http://journal.frontiersin.org/article/10.3389/fpsyg.2013.00300/ful
Numerical investigation of magnetohydrodynamic slip flow of power-law nanofluid with temperature dependent viscosity and thermal conductivity over a permeable surface
No full textAbstract
In this paper, a numerical investigation is carried out to study the effect of temperature dependent viscosity and thermal conductivity on heat transfer and slip flow of electrically conducting non-Newtonian nanofluids. The power-law model is considered for water based nanofluids and a magnetic field is applied in the transverse direction to the flow. The governing partial differential equations(PDEs) along with the slip boundary conditions are transformed into ordinary differential equations(ODEs) using a similarity technique. The resulting ODEs are numerically solved by using fourth order Runge-Kutta and shooting methods. Numerical computations for the velocity and temperature profiles, the skin friction coefficient and the Nusselt number are presented in the form of graphs and tables. The velocity gradient at the boundary is highest for pseudoplastic fluids followed by Newtonian and then dilatant fluids. Increasing the viscosity of the nanofluid and the volume of nanoparticles reduces the rate of heat transfer and enhances the thickness of the momentum boundary layer. The increase in strength of the applied transverse magnetic field and suction velocity increases fluid motion and decreases the temperature distribution within the boundary layer. Increase in the slip velocity enhances the rate of heat transfer whereas thermal slip reduces the rate of heat transfer.</jats:p
Slip Flow and Heat Transfer of Nanofluids over a Porous Plate Embedded in a Porous Medium with Temperature Dependent Viscosity and Thermal Conductivity
No full textIt is well known that the best way of convective heat transfer is the flow of nanofluids through a porous medium. In this regard, a mathematical model is presented to study the effects of variable viscosity, thermal conductivity and slip conditions on the steady flow and heat transfer of nanofluids over a porous plate embedded in a porous medium. The nanofluid viscosity and thermal conductivity are assumed to be linear functions of temperature, and the wall slip conditions are employed in terms of shear stress. The similarity transformation technique is used to reduce the governing system of partial differential equations to a system of nonlinear ordinary differential equations (ODEs). The resulting system of ODEs is then solved numerically using the shooting technique. The numerical values obtained for the velocity and temperature profiles, skin friction coefficient and Nusselt’s number are presented and discussed through graphs and tables. It is shown that the increase in the permeability of the porous medium, the viscosity of the nanofluid and the velocity slip parameter decrease the momentum and thermal boundary layer thickness and eventually increase the rate of heat transfer
Renewable Energy Maximization for Pelagic Islands Network of Microgrids Through Battery Swapping Using Deep Reinforcement Learning
No full textCorrespondence to Joseph E. Lowery from Asim Israel, August 29, 1986
No full textA letter to Joseph E. Lowery from Asim Israel of the House of Israel requesting assistance in contacting Louis Stokes, Jesse Jackson, and Reverend Clay Evans to convince the Guyana government to release David Hill from prison. 1 page.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the Joseph & Evelyn Lowery Institute for Justice and Human Rights, the Joseph Echols Lowery Irrevocable Trust, and other donors in supporting the processing and digitization of Morehouse College's Joseph Echols and Evelyn Gibson Lowery Collection
Yasik H, Al Aziz. 2015. Upaya Meningkatkan Keterampilan Shooting Sepakbola Menggunakan Bentuk Latihan Shooting Yang Bervariasi Untuk Siswa Ekstrakurikuler Sepakbola di SMA Negeri 1 Kesamben.
No full textABSTRAK Hardiyono, Al Aziz Yasik. 2015. Upaya Meningkatkan Keterampilan Shooting Sepakbola Menggunakan Bentuk Latihan Shooting Yang Bervariasi Untuk Siswa Ekstrakurikuler Sepakbola di SMA Negeri 1 Kesamben. Skripsi, Jurusan Pendidikan Jasmani dan Kesehatan, Fakultas Ilmu Keolahragaan, Universitas Negeri Malang. Pembimbing: (I) Dr. Eko Hariyanto, M.Pd. (II) Dr. Asim, M.Pd. Kata Kunci: Keterampilan Shooting, Bentuk Latihan yang Bervariasi, Ekstrakurikuler Keterampilan shooting merupakan salah satu keterampilan dasar yang harus dikuasai oleh pemain dalam permainan sepakbola. Dengan keterampilan shooting yang baik, maka seorang pemain dapat melakukan tendangan ke gawang yang baik. Berdasarkan hasil observasi awal yang dilaksanakan di siswa ekstrakurikuler sepakboloa SMA Negeri 1 Kesamben, keterampilan shooting siswa masih kurang maksimal hal ini dikarenakan beberapa faktor terutama pembelajarannya yang hanya berorientasi pada latihan fisik tanpa bola yang membuat siswa mengalami kejenuhan. Penelitian tindakan olahraga ini bertujuan untuk meningkatkan keterampilan shooting melalui bentuk program latihan yang bervasiasi. Dengan diberikan variasi-variasi dalam latihan shooting diharapkan mampu mengurangi kejenuhan siswa dalam latihan dan meningkatkan keinginan siswa untuk menjalni semua materi latihan yang diberikan pelatih. Sehingga siswa dapat memperoleh hasil latihan yang maksimal. Metode penelitian ini menggunakan pendekatan deskriptif kuantitatif dan diskriptif kualitatif. Pelaksanaan tindakan olahraga ini dilakukan melalui dua siklus, satu siklus tiga kali pertemuan dimana setiap siklus terdiri dari 4 tahap, yaitu: (1) perencanaan, (2) pelaksanaan, (3) pengamatan, (4) refleksi. Subjek dalam penelitian ini adalah 28 siswa ekstrakurikuler sepakbola SMA Negeri 1 Kesamben. Teknik pengumpulan data dalam penelitian ini menggunakan wawancara, observasi (pengamatan) dan tes keterampilan. Hasil dari 2 siklus yang diterapkan dapat dilihat dari persentase gerakan shooting yang benar pada siklus I dan siklus II hasilnya sebagai berikut, pada siklus I pertemuan ke-1, ke-2, dan ke-3 secara berurutan adalah pada tahap persiapan sebesar 77%, 83,93%, 90,18%. tahap pelaksanaan sebesar 52%, 58,04%, 61,61% sedangkan tahap follow-through sebesar 44%, 50%, 53,57%. Pada siklus II mengalami peningkatan yaitu pertemuan ke-1, ke-2, dan ke-3 secara berurutan adalah pada tahap persiapan sebesar 98,21%, 100%, 100%. Tahap pelaksanaan sebesar 65,18%, 71,43%, 85,71% sedangkan tahap follow-through sebesar 61,9%, 69,95%, 80,95%. Kesimpulan yang diperoleh dari penelitian ini adalah dengan diberikan bentuk latihan yang bervariasi dapat meningkatkan keterampilan shooting siswa dalam pembelajaran shooting sepakbola. Adapun saran yang diberikan Dari hasil penelitian ini, pelatih dapat memberikan bentuk-bentuk latihan yang bervariasi untuk mengasah keterampilan shooting siswa di ekstrakurikuler dan siswa dapat mengasah kemampuannya sendiri dirumah sesuai dengan latihan yang diberikan
Responsible conduct and documentation of research: a standard operating procedure template that can be customized
No full textIf you have comments or suggestions for improvements, please direct these to the corresponding author, Catherine Hayward ([email protected]).This standard operating procedure (SOP) document was prepared as a template that individual researchers can customize for their own use. Prior to publication, this SOP underwent peer review by the McMaster University Faculty of Health Sciences Research Council. The Council has endorsed the publication of this SOP to encourage researchers to develop procedures that encourage best research practices and can be customized to meet specific needs.
Should you decide to customize this SOP for your own use, please acknowledge the original authors, who include Ms. D’Andra Parker and Mr. Asim Soomro (graduate students in the Hayward laboratory). All items highlighted in yellow in the SOP must be customized.
This procedure outlines the steps involved in proper recording keeping in the laboratory. This SOP applies any/all data generated while in the laboratory, and any/all the laboratory records
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