scholarly journals Thermal performance of roofs suitable for developing countries in tropical climate

2021 ◽  
Vol 2069 (1) ◽  
pp. 012202
Author(s):  
P Čanda ◽  
P Kopecký
Keyword(s):  
Thermal Performance ◽  
Opposite Effect ◽  
Tropical Climate ◽  
Pure Metal ◽  
Rear Side ◽  
Reference Case ◽  
Additional Material ◽  
Interior Spaces ◽  
Metal Sheets ◽  
The University

Abstract Roof structures have been traditionally built from reed or straw in tropical climate locations. Now, traditional materials are often replaced by pure metal sheets. The roof construction is improved in terms of durability and cost effectiveness, but he roof built from pure metal sheets can cause excessive overheating of interior spaces. The aim of this paper is to compare dynamic thermal performance of different roof assemblies under real boundary conditions. For this purpose, a thermally insulated test box was built on the roof of the university. Six roof samples (0,9 m × 1,1 m) can be mounted on the roof. The roof covering made of pure steel sheet with Zn coating was the reference case. This assembly was then modified step-by-step either by change of colour, or by additional material layers of reed and earth boards, or by 2cm thick ventilated air cavity on the rear side of the sheet. In total, 18 different roof assemblies were tested in three consecutive test runs (approximately three-week periods between 07 – 09-2020). Ventilated air gap and white paint are the best adjustments to reduce heat flux. Dark colours of the metal sheet have the opposite effect. Influence of reed and earth boards was in many cases similar. One roof assembly was selected for use in real project.

Laboratory Infra-Red Thermal Assessment of Laser-Sintered High-Pressure Nozzle Guide Vanes to De-Risk Engine Design Programmes

2016 ◽  
Author(s):  
Benjamin Kirollos ◽  
Thomas Povey
Keyword(s):  
Thermal Performance ◽  
Cooling System ◽  
Experimental Tests ◽  
University Of Oxford ◽  
Engine Design ◽  
Infra Red ◽  
Nozzle Guide ◽  
Processing Techniques ◽  
The University ◽  
Nozzle Guide Vanes

The continuing maturation of metal laser-sintering technology (DMLS) presents the opportunity to de-risk the engine design process by experimentally down-selecting HPNGV cooling designs using laboratory tests of laser-sintered — instead of cast — parts to assess thermal performance. Such tests could be seen as supplementary to thermal-paint-test engines, which are used during certification to validate cooling system designs. In this paper, we compare conventionally cast and laser-sintered titanium alloy parts in back-to-back experimental tests at engine-representative conditions over a range of coolant mass flow rates. Tests were performed in the University of Oxford Annular Sector Heat Transfer Facility. The thermal performance of the cast and laser-sintered parts — measured using new infra-red processing techniques — is shown to be very similar, demonstrating the utility of laser-sintered parts for preliminary engine thermal assessments. We conclude that the methods reported in this paper are sufficiently mature to make assessments which could influence engine development programmes.

scholarly journals Effect of landscape density in a residential area on thermal performance in a tropical climate

2016 ◽  
Vol 66 ◽  
pp. 00044
Author(s):  
Noorazlina Kamarulzaman ◽  
Nor Amila Wan Abdullah Zawawi ◽  
Nurul Izma Mohammed
Keyword(s):  
Thermal Performance ◽  
Tropical Climate ◽  
Residential Area

Thermal performance of concrete-based roofs in tropical climate

2014 ◽  
Vol 76 ◽  
pp. 392-401 ◽  
Author(s):  
Shanshan Tong ◽  
Hua Li ◽  
Kishor T. Zingre ◽  
Man Pun Wan ◽  
Victor W.-C. Chang ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Tropical Climate

scholarly journals From sedentary and physical inactive behaviors to the Race Across America (RAAM): a case report

2019 ◽  
Vol 67 (4) ◽  
Keyword(s):  
Case Report ◽  
Psychological Health ◽  
Nursing Student ◽  
Opposite Effect ◽  
Specific Training ◽  
Specific Context ◽  
The Subject ◽  
The University ◽  
Health Parameters

This case report presents the evolution of physiological and psychological health parameters of a former sedentary and physically inactive nursing student during an 18 months period (three academic semesters), during which she first took part to a one-semester institutional physical activity (PA) program offered by her University, before being selected to participate in relay to the Race Across America (RAAM) with a team of the University. The four months before the RAAM, she followed a cycling specific training program. After the RAAM, she was followed-up the next eight months. Results show that each step of the study had an important impact on health parameters of the subject and that sedentary and physical inactive behaviors are not irreversible. Institutional PA program, including training education in addition to concurrent strength and endurance training could lead to physiological and psychological health improvements. Moreover, in some individuals organising a challenge might contribute to improve motivation and long-term adherence to PA participation, while in others this could have the opposite effect. An individualised approach should be considered in future interventions aiming to improve PA promotion. Finally, in the specific context of a University of Health Sciences, this kind of initiative could positively influence the general population’s health, by educating students as actors in PA promotion.

Ways of increasing motivation in the university foreign language teaching

2020 ◽  
pp. 34-41
Author(s):  
Tatyana G. Bortnikova ◽  
Marina I. Dolzhenkova
Keyword(s):  
Foreign Language ◽  
Language Teaching ◽  
Foreign Language Teaching ◽  
Educational Process ◽  
Educational Activity ◽  
Professional Activity ◽  
Additional Material ◽  
The Creation ◽  
The University ◽  
Country Specific

The problem of ways of increasing motivation in the university foreign language teaching is analyzed. It is emphasized the motivation can cause the purposeful activity of a student’s personality in learning a foreign language. The analysis of scientific literature that is connected with the problems of motivation as a complex mechanism of the correlation of external and internal factors that determine the appearance and methods of implementation of educational activity forms, its focus on the internal incentives of knowledge gaining, is carried. Attention is focused on the fact that the efficiency of educational activities depends on the strength of motivation. The degree of success depends on the use of techniques and methods of the learning process organizing, which, in our opinion, contribute to the creation of motivational incentives of learning a foreign language: the linguistic and country-specific studies aspect, focus on professional activity, the use of computer technologies in extracurricular work, and educational process gamification. It is concluded that the internal motivation has a great motivating force, and its condition is the creation of the success situation by the teacher that can be reached with the help of reward for successful work system, attracting the additional material of country-specific studies nature, improving communicative skills, usage of educational platforms as homework, usage of the gamification to involve students in solving educational non-game processes and situations.

Microscopy and Microanalysis of Plutonium Metal, Alloys and Oxides or the Problem With Pu

2000 ◽  
Vol 6 (S2) ◽  
pp. 932-933
Author(s):  
Rollin E. Lakis ◽  
Bradford G. Storey ◽  
Charles C. Davis
Keyword(s):  
Atomic Number ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Pure Metal ◽  
University Of California ◽  
Metal Alloys ◽  
Naturally Occurring ◽  
The University ◽  
Crystalline Forms ◽  
Plutonium Metal

Plutonium (Pu), with an atomic number of 94, is the highest atomic number naturally occurring element on Earth. It is formed when naturally occurring Uranium 238 captures a neutron that can be created by spontaneous fission and alphaneutron reactions. The natural abundance of terrestrial Pu is very small; its concentration is about one part in 10 of the uranium present in naturally occurring uranium ores. The first man-made plutonium was produced at the University of California cyclotron and identified on February 23, 1941. Just a few months after the first Pu was produced it became clear how metallurgically complex this material is. Plutonium is known to have six allotropes (crystalline forms) at atmospheric pressure, between room temperature and 640°C, the melting point of the pure metal. This is the largest number of allotropes known for any element.

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