Influence of temperature difference on surface figure controlling during continuous polishing

2015 ◽  
Author(s):  
Meijuan Hong ◽  
Xueke Xu ◽  
Aihuan Dun ◽  
Minghong Yang ◽  
Wenlan Gao ◽  
...  
Keyword(s):  
Temperature Difference ◽  
Influence Of Temperature ◽  
Surface Figure

scholarly journals Investigation of the Precision in Geodetic Reference-Point Positioning Because of Temperature-Induced Pillar Deflections

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3489 ◽  
Author(s):  
Robert Močnik ◽  
Božo Koler ◽  
Dejan Zupan ◽  
Tomaž Ambrožič
Keyword(s):  
Reinforced Concrete ◽  
Temperature Variation ◽  
Temperature Difference ◽  
Reference Point ◽  
Horizontal Displacement ◽  
Research Paper ◽  
Reference Points ◽  
Control Points ◽  
Temperature Changes ◽  
Influence Of Temperature

To perform geodetic measurements of displacements of the ground and manmade constructions, stabilised reference points are needed from which control points on the object or its surroundings could be measured. Reference points are most commonly stabilised with reinforced concrete pillars; however, they are not always constructed in an appropriate manner. The influence of temperature variation within a pillar on the position of the fixed screw for forced centring is not negligible and should be considered when performing precise measurements. In this research paper, the displacement of a pillar was calculated as a result of the temperature changes in the pillar, and then an experiment was performed in which the pillar was heated from one side, and the horizontal displacement of the fixed screw for forced centring was measured. Both, calculations and measurements, show that at a temperature difference of 16.2 °C, the fixed screw on a 1.5 m high pillar moves by approximately 1 mm, which is a displacement that should be taken into account in precise measurements.

scholarly journals Experimental study on fiber mortar strength at early age under temperature difference

2019 ◽  
Vol 264 ◽  
pp. 02005
Author(s):  
Yan Zhang ◽  
Ning Li
Keyword(s):  
High Temperature ◽  
Temperature Difference ◽  
Concrete Structure ◽  
Early Age ◽  
Experimental Basis ◽  
Cement Concrete ◽  
Influence Of Temperature ◽  
Mortar Strength ◽  
Strength Change ◽  
Strength Difference

The condition of high temperature is easy to destroy the concrete structure of tunnels. Many temperature difference conditions are applied to ordinary mortar and fiber mortar specimens, the early strength values of mortar caused by temperature change were measured. The flexural strength change rules of the specimens were analysed. The influence of temperature difference on different specimens, and the cause of the strength difference and failure of the specimens are studied. It provides experimental basis for improving the service life of high temperature tunnel cement concrete structure.

scholarly journals Influence of temperature difference (water-cover surface) on the performance of a compact hemispherical solar still

2020 ◽  
Vol 39 (3) ◽  
pp. 792-799
Author(s):  
B.Z. Adewole ◽  
A.E. Arabambi ◽  
A.A. Asere
Keyword(s):  
Surface Temperature ◽  
Temperature Difference ◽  
Water Productivity ◽  
Climatic Conditions ◽  
Water Yield ◽  
Solar Still ◽  
Influence Of Temperature ◽  
Solar Intensity ◽  
Maximum Water ◽  
Temperature Water

The study investigated the influence of temperature difference (ΔT) between evaporative and condensing surface temperature on water productivity of hemispherical solar still. The still was developed, tested and evaluated under the climatic conditions of Ile-Ife, Nigeria, to obtain an average distillate yield per hour per day for different combination of basin temperature, water temperature, transparent cover temperature, ambient temperature and solar intensity. Results indicated a decrease in the hourly water yield as (ΔT) increases. Regression analysis revealed that ΔT has no significant influence on the hourly water yield (P > 0.05). Maximum water productivity was obtained for a low condensing surface temperature and a high evaporative surface temperature. The study concluded that the improvement on water productivity of solar still can be achieved by enhancing the evaporative and condensing surface temperature. Methods for obtaining higher evaporating temperature should be sought in order to boost water productivity of solar stills. Keywords: Temperature difference, Evaporative surface, Condensing surface, Hourly water yield, Heat losses.

Influence of temperature and temperature difference in the performance of forward osmosis desalination process

2012 ◽  
Vol 415-416 ◽  
pp. 734-744 ◽  
Author(s):  
Sherub Phuntsho ◽  
Saravanamuthu Vigneswaran ◽  
Jaya Kandasamy ◽  
Seungkwan Hong ◽  
Sangyoup Lee ◽  
...  
Keyword(s):  
Temperature Difference ◽  
Forward Osmosis ◽  
Influence Of Temperature
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