The Effect of Temperature Rise in a Fine Blanking Tool

2007 ◽  
Author(s):  
Su-Hyun Kim ◽  
JeongJin Kang ◽  
Dong-Jae Lee ◽  
Kwan-Young Lee ◽  
Heon-Young Kim ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Effect Of Temperature ◽  
Fine Blanking

scholarly journals Effects of temperature and organic pollution on nutrient cycling in marine sediments

2015 ◽  
Vol 12 (15) ◽  
pp. 4565-4575 ◽  
Author(s):  
C. Sanz-Lázaro ◽  
T. Valdemarsen ◽  
M. Holmer
Keyword(s):  
Climate Change ◽  
Organic Matter ◽  
Nutrient Cycling ◽  
Water Column ◽  
Temperature Rise ◽  
Nutrient Release ◽  
Organic Pollution ◽  
Coastal Sediments ◽  
Effect Of Temperature ◽  
Climate Change Scenarios

Abstract. Increasing ocean temperature due to climate change is an important anthropogenic driver of ecological change in coastal systems. In these systems sediments play a major role in nutrient cycling. Our ability to predict ecological consequences of climate change is enhanced by simulating real scenarios. Based on predicted climate change scenarios, we tested the effect of temperature and organic pollution on nutrient release from coastal sediments to the water column in a mesocosm experiment. PO43− release rates from sediments followed the same trends as organic matter mineralization rates, increased linearly with temperature and were significantly higher under organic pollution than under nonpolluted conditions. NH4+ release only increased significantly when the temperature rise was above 6 °C, and it was significantly higher in organic polluted compared to nonpolluted sediments. Nutrient release to the water column was only a fraction from the mineralized organic matter, suggesting PO43− retention and NH4+ oxidation in the sediment. Bioturbation and bioirrigation appeared to be key processes responsible for this behavior. Considering that the primary production of most marine basins is N-limited, the excess release of NH4+ at a temperature rise > 6 °C could enhance water column primary productivity, which may lead to the deterioration of the environmental quality. Climate change effects are expected to be accelerated in areas affected by organic pollution.

Asymmetric Thermal Buckling of Imperfect FGM Circular Plates with Rotationally Restrained Edge

2020 ◽  
Vol 20 (12) ◽  
pp. 2050127
Author(s):  
S. V. Levyakov
Keyword(s):  
Critical Temperature ◽  
Temperature Rise ◽  
Material Properties ◽  
Thermal Loading ◽  
Plate Theory ◽  
Nonlinear Eigenvalue Problem ◽  
Mode Shapes ◽  
Effect Of Temperature ◽  
Circular Plates ◽  
Governing Equations

The paper addresses the problem of asymmetric buckling of geometrically imperfect circular plates undergoing large axisymmetric deflections under thermal loading. The plate edge is assumed to be immovable in the radial direction and elastically restrained against bending rotation. The plate material is graded in the thickness direction and dependence of the material properties on temperature is taken into account. The governing equations are derived using the von Karman nonlinear plate theory and the concept of physically neutral surface. It is shown that, when subjected to increasing temperature, the plate initially bends into a figure of revolution and then buckles into asymmetric mode with local circumferential waves. To determine the critical temperature rise, a nonlinear eigenvalue problem is formulated by linearizing the governing equations about the axisymmetric state of equilibrium and solved using power-series expansions. The effect of temperature-dependent material properties, rotational spring stiffness and initial geometric imperfection on the critical temperature rise and buckling mode shapes is studied.

scholarly journals Effect of temperature rise on microstructural evolution during high-pressure torsion

2018 ◽  
Vol 714 ◽  
pp. 167-171 ◽  
Author(s):  
Kaveh Edalati ◽  
Yuki Hashiguchi ◽  
Pedro Henrique R. Pereira ◽  
Zenji Horita ◽  
Terence G. Langdon
Keyword(s):  
High Pressure ◽  
Microstructural Evolution ◽  
Temperature Rise ◽  
High Pressure Torsion ◽  
Effect Of Temperature

Effect of temperature rise on characteristics of a standing wave ultrasonic motor

2019 ◽  
Vol 30 (6) ◽  
pp. 855-868 ◽  
Author(s):  
Qibao Lv ◽  
Zhiyuan Yao ◽  
Lifeng Zhou ◽  
Lingyong Pan
Keyword(s):  
Standing Wave ◽  
Temperature Rise ◽  
Piezoelectric Materials ◽  
Ultrasonic Motor ◽  
Effect Of Temperature ◽  
Material Parameters ◽  
Proposed Model ◽  
And Performance ◽  
Output Characteristics ◽  
Frequency Temperature

Heat loss occurs in the process of energy conversion, which causes the temperature rise and performance degradation of ultrasonic motor. In this article, a novel theoretical model is developed to investigate the temperature field and output characteristics of a standing wave ultrasonic motor. The roughness of contact surface and the interaction between temperature rise and material parameters of stator are taken into account in the proposed model. The frequency–temperature characteristics of stator are studied, and the changes in the dielectric coefficients of piezoelectric materials with respect to the temperature are determined by experimental data. The accuracy and effectiveness of the developed model are validated by correlative experiment. The results show that the developed model can not only predict the temperature variation of motor in continuous operation but also evaluate the influence of surface roughness and various input parameters on output characteristics of motor. These researches will give useful guidelines for optimizing heat source and enhancing reliability of motor.

scholarly journals Effects of global climate change and organic pollution on nutrient cycling in marine sediments

2015 ◽  
Vol 12 (1) ◽  
pp. 21-49
Author(s):  
C. Sanz-Lázaro ◽  
T. Valdemarsen ◽  
M. Holmer
Keyword(s):  
Climate Change ◽  
Organic Matter ◽  
Nutrient Cycling ◽  
Water Column ◽  
Temperature Rise ◽  
Nutrient Release ◽  
Organic Pollution ◽  
Coastal Sediments ◽  
Effect Of Temperature ◽  
Climate Change Scenarios

Abstract. Increasing ocean temperature due to climate change is an important anthropogenic driver of ecological change in coastal systems, where sediments play a major role in nutrient cycling. Our ability to predict ecological consequences of climate change is enhanced by simulating real scenarios especially when the interactions among drivers may not be just additive. Based on predicted climate change scenarios, we tested the effect of temperature and organic pollution on nutrient release from coastal sediments to the water column in a mesocosm experiment. PO43− release rates from sediments followed the same trends as organic matter mineralization rates, and increased linearly with temperature and were significantly higher under organic pollution than under non-polluted conditions. NH4+ release only increased significantly when the temperature rise was above 6 °C, and was significantly higher in organic polluted compared to non-polluted sediments. Nutrient release to the water column was only a fraction from the mineralized organic matter, suggesting PO43− retention and NH4+ oxidation in the sediment. Bioturbation and bioirrigation appeared to be key processes responsible of this behaviour. Considering that the primary production of most marine basins is N-limited, the excess release of NH4+ at temperature rise >6 ° could enhance water column primary productivity, which may lead to the deterioration of the environmental quality. Climate change effects are expected to be accelerated in areas affected by organic pollution.

scholarly journals Carbon Content In Macroalgae Species Against Temperature Regime

Omni-Akuatika ◽  
2019 ◽  
Vol 15 (2) ◽  
pp. 1
Author(s):  
Tri Dewi Kusumaningrum Pribadi ◽  
Yudi Nurul Ihsan
Keyword(s):  
Carbon Content ◽  
Temperature Rise ◽  
Temperature Regime ◽  
Intertidal Zone ◽  
The Other ◽  
Effect Of Temperature ◽  
Carbon Uptake ◽  
Plant Metabolism ◽  
Series Of Experiments ◽  
Species Being

Temperature rise due to climate change have an impact on various ecosystems, including coastal ecosystems. Temperature rise also affects plant metabolism, such as carbon uptake. Macroalgae is the dominant community in the intertidal zone, and potential to absorb carbon. A series of experiments on several dominant macroalgae species from the south coast of West Java have been done to see the effect of temperature regime on carbon content. The treatment of temperatures of 24, 27, 30, and 33 °C was carried out for 72 hours against 6 macroalgae species representing Chlorophycae, Phaeophycea and Rhodophyceae to investigate carbon content. The results showed that the macroalgae of Phaeophyceae division showed higher carbon content in comparison to the macroalgae of the other divisions. The temperature that significantly affects chloropyll was 33 oC against all the species being tested.

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