Gallium as a Metrology Substance for Measuring Thermal Conductivity of Metals

2016 ◽  
Vol 831 ◽  
pp. 144-150
Author(s):  
Franciszek Wolańczyk
Keyword(s):  
Thermal Conductivity ◽  
Temperature Fields ◽  
Simple Experiment ◽  
Stationary Model ◽  
Vacuum Measurement ◽  
Process Measurement ◽  
University Of Technology ◽  
Rod Of Finite Length ◽  
Phase Process

In the presented work the effective thermal conductivity of steel was received from the simple experiment in which the change of phase metrology-matter was applied [1]. As the metrology-matter gallium was used.The change of phase process plays role of the heat source. During the change of phase period the temperature is constant. A quasi-stationary temperature fields allows to use the stationary model of heat transfer calculations. The model is a cylindrical rod of finite length losing heat out one face to melting-substance and by radiation from surface, respectively. All process measurement was carried out in vacuum. Measurement of thermal conductivity quasi-stationery method is practiced at the Department of Thermodynamics at Rzeszow University of Technology. This method has application in measurement of thermal conductivity of good conductors.

Lattice Thermal Conductivity Modelling of a Diatomic Nanoscale Material

2020 ◽  
Vol 10 (5) ◽  
pp. 602-609
Author(s):  
Adil H. Awad
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Correction Term ◽  
Nanoscale Material ◽  
New Approach ◽  
Two Samples ◽  
Conductivity Modelling ◽  
Callaway Model

Introduction: A new approach for expressing the lattice thermal conductivity of diatomic nanoscale materials is developed. Methods: The lattice thermal conductivity of two samples of GaAs nanobeam at 4-100K is calculated on the basis of monatomic dispersion relation. Phonons are scattered by nanobeam boundaries, point defects and other phonons via normal and Umklapp processes. Methods: A comparative study of the results of the present analysis and those obtained using Callaway formula is performed. We clearly demonstrate the importance of the utilised scattering mechanisms in lattice thermal conductivity by addressing the separate role of the phonon scattering relaxation rate. The formulas derived from the correction term are also presented, and their difference from Callaway model is evident. Furthermore their percentage contribution is sufficiently small to be neglected in calculating lattice thermal conductivity. Conclusion: Our model is successfully used to correlate the predicted lattice thermal conductivity with that of the experimental observation.

Role of electron–phonon coupling in thermal conductivity of metallic nanofluids

2019 ◽  
Vol 52 (48) ◽  
pp. 485302 ◽  
Author(s):  
Dong-Xing Song ◽  
Yu-Feng Zhang ◽  
Wei-Gang Ma ◽  
Xing Zhang
Keyword(s):  
Thermal Conductivity ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Role of graphene waviness on the thermal conductivity of graphene composites

2012 ◽  
Vol 111 (1) ◽  
pp. 221-225 ◽  
Author(s):  
Ke Chu ◽  
Wen-sheng Li ◽  
Hongfeng Dong
Keyword(s):  
Thermal Conductivity

Method of Lines to Solve 2-D Steady Temperature Field of FGM

2007 ◽  
Vol 353-358 ◽  
pp. 2003-2006 ◽  
Author(s):  
Wei Tan ◽  
Chang Qing Sun ◽  
Chun Fang Xue ◽  
Yao Dai
Keyword(s):  
Thermal Conductivity ◽  
Temperature Field ◽  
Transfer Problem ◽  
Method Of Lines ◽  
Main Idea ◽  
Functionally Graded ◽  
Temperature Fields ◽  
Steady Temperature ◽  
Thermal Transfer ◽  
Steady Temperature Field

Method of Lines (MOLs) is introduced to solve 2-Dimension steady temperature field of functionally graded materials (FGMs). The main idea of the method is to semi–discretized the governing equation of thermal transfer problem into a system of ordinary differential equations (ODEs) defined on discrete lines by means of the finite difference method. The temperature field of FGM can be obtained by solving the ODEs with functions of thermal properties. As numerical examples, six kinds of material thermal conductivity functions, i.e. three kinds of polynomial functions, an exponent function, a logarithmic function, and a sine function are selected to simulate spatial thermal conductivity profile in FGMs respectively. The steady-state temperature fields of 2-D thermal transfer problem are analyzed by the MOLs. Numerical results show that different material thermal conductivity function has obvious different effect on the temperature field.

scholarly journals HIV/AIDS awareness among first year pharmacy students and the role of the university

2007 ◽  
Vol 3 (2) ◽  
Author(s):  
Selente Bezuidenhout ◽  
Rob Summers
Keyword(s):  
The Body ◽  
Pharmacy Students ◽  
First Year ◽  
Tertiary Institutions ◽  
University Of Technology ◽  
Inadequate Knowledge ◽  
Aids Awareness ◽  
The University ◽  
Hiv Aids

As HIV/AIDS continues to spread and affect the lives of millions of people, a sense of urgency has developed about the imperative need to stop the epidemic. Education is the key to change knowledge, attitudes and behaviour. There is currently a gap in educationprogrammes targeting youths of ages 18-24 years, for example, those enrolled in tertiary institutions. The aim of the study was therefore to establish the level of HIV/AIDS awareness among undergraduate pharmacy students at the University of Limpopo (Medunsa Campus)/ Tshwane University of Technology Schools of Pharmacy. A structured questionnaire was administered to pharmacy students on entry to the programme. Although the students of 2003, 2004 and 2005 obtained mean percentage HIV/AIDS awareness scores in the range of 70%-80%, they had inadequate knowledge of some transmission routes, events that occur when HIV invades the body, the “window period” and some symptoms. These knowledge gaps should be addressed by universities by integrating HIV/AIDS policies and education fully into all aspects of their planning, operations andteaching.

scholarly journals The International Centre for Communication in Healthcare: Creating Safer and More Compassionate Healthcare Systems around the World

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Diana Slade ◽  
Christian M.I.M. Matthiessen ◽  
Elizabeth A. Rider ◽  
Jack Pun Kwok Hung
Keyword(s):  
Hong Kong ◽  
Improve Patient Safety ◽  
Human Values ◽  
Research Education ◽  
Healthcare Settings ◽  
University Of Technology ◽  
The World ◽  
Working Together ◽  
Interprofessional Healthcare

Background: The role of communication in healthcare receives increasing attention, yet little research exists that brings together perspectives from interprofessional healthcare researchers and practitioners with linguists and communication specialists. The International Centre for Communication in Healthcare[1] is a response to increasing recognition of the central role of communication and relationships in the delivery of safe, effective and compassionate healthcare.Objective: To develop a worldwide, multidisciplinary collaborative of internationally recognized healthcare professionals and communication experts working together to translate research into education and practice to improve patient safety, communication and relationships in healthcare.Methods: The International Collaborative for Communication in Healthcare (a precursor to the Centre) began in 2010, and was founded at Hong Kong Polytechnic University (PolyU) in March 2011. We initiated research collaborations and presented colloquia, workshops and papers at international conferences.Results: The Centre, co-convened by PolyU and University of Technology, Sydney, was formally launched at PolyU in June 2013 with over 50 members from over 10 countries. The Centre is developing a strategic research agenda for communication in healthcare to improve the quality and safety of patient care, and to mobilize knowledge and expertise gained from research to guide teaching and implementation of communication skills and compassionate care in healthcare education and practice.  In an early initiative in 2011, we created the International Charter for Human Values in Healthcare[2], a collaborative effort involving people, organizations and institutions around the world working together to restore core human values to healthcare. The values of the International Charter inform the Centre’s research, education and practice initiatives.Conclusions: Effective communication is increasingly recognized as integral to safe, effective, and compassionate healthcare. The International Centre for Communication in Healthcare brings together interdisciplinary researchers, educators and practitioners from diverse disciplines to explore and improve communication and relationships in healthcare settings around the world.References1. The International Centre for Communication in Healthcare.  Hong Kong Polytechnic University and University of Technology, Sydney. http://icchweb.org2. The International Charter for Human Values in Healthcare. December 2, 2012. http://charterforhealthcarevalues.org

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