Improving high temperature characteristic of SiGeC/Si heterojunction diode with propane carbon source

Mechanical properties are critical to the working performance of magnetorheological fluids (MRFs), especially in high temperature situations. This paper presents an experimental investigation to analyze the effects of temperature on mechanical properties of MRFs. First, a parallel disk method was implemented for the shear stress measurement of MRFs and the measurement principle was theoretically illustrated. Then, a detailed introduction to the MRF sample preparation and the testing device development was performed as well. In the study, five kinds of MRF samples with different material parameters were prepared and a shear stress testing device which possesses the temperature control function was developed and evaluated. After these, a series of measurements were conducted on the viscosity–temperature characteristic, shear stress–temperature characteristic and thermal stability of MRF samples. Measuring results indicated that the mechanical properties of MRFs were obviously dependent on temperature. The phenomenon mainly embodied in the reduction of off-field viscosity and shear stress with increasing temperature, as well as the performance degradation after undergoing a low–high–low temperature cycle or a high temperature treatment of more than 150 ℃.

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Temperature Dependent Characteristics of 1D Photonic Crystal with Defects

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.535-537.1299 ◽

2012 ◽

Vol 535-537 ◽

pp. 1299-1303

Author(s):

Hui Bo Wang ◽

Kai Tong ◽

Mei Ting Wang ◽

Chao Cong Guo

Keyword(s):

High Temperature ◽

Photonic Crystal ◽

Low Temperature ◽

Linear Relationship ◽

Temperature Characteristic ◽

Central Wavelength ◽

Temperature Changes ◽

Icp Etching ◽

Thermal Expansion Effect ◽

Expansion Effect

When the temperature is changed, due to the influence of the thermal expansion effect and thermo-optic effect, the thickness and refractive index of each layer of medium of photonic crystal will be Varied. As shown by optical resonators theory, the drift amount of the wavelength has a linear relationship with the variation of temperature. The electron beam lithography technology (EBL) and induction coupling plasma(ICP) etching were used for making the PCs with 1550nm central wavelength. An experiment mode is constructed for analyzing temperature characteristic of one-dimensional PCs, and then PCs is experimented at low temperature and high temperature. It can be found by experiment that, as the temperature changes, the central wavelength of photonic crystal has a linear relationship with the temperature, the drift amount of central wavelength at the low temperature is 0.072nm/°C,the drift amount at the high temperature is 0.076nm/°C,and the 3dB bandwidth of transmission spectrum of photonic crystal has no significant change, the spectral shape is changed very little.

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TEMPERATURE AND CRITICAL ILLUMINATION FOR REACTION TO FLICKERING LIGHT

The Journal of General Physiology ◽

10.1085/jgp.22.6.795 ◽

1939 ◽

Vol 22 (6) ◽

pp. 795-818 ◽

Cited By ~ 2

Author(s):

W. J. Crozier ◽

Ernst Wolf

Keyword(s):

High Temperature ◽

Temperature Characteristic ◽

Constant Light ◽

Flickering Light ◽

Unusual Form

At fixed flash frequency (F = 20, F = 55) and with constant light time fraction (50 per cent) in the flash cycle, the critical illumination I for response of Anax nymphs to visual flicker falls continuously as the temperature rises. The temperature characteristic µ for the measure of excitability (1/I) increases continuously with elevation of temperature. The form of the F - log I curve does not change except at quite high temperature (35.8°), and then only slightly (near F = 55); Fmax. is not altered. The very unusual form of the 1/I curve as a function of temperature is quantitatively accounted for if two processes, with respectively µ = 19,200 and µ = 3,400, contribute independently and simultaneously to the control of the speed of the reaction governing the excitability; the velocities of these two processes are equal at 15.9°.

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Low threshold and high temperature characteristic of 1.3 μm InAsP/AlGaInAs MQW ACIS lasers

1999 IEEE LEOS Annual Meeting Conference Proceedings. LEOS'99. 12th Annual Meeting. IEEE Lasers and Electro-Optics Society 1999 Annual Meeting (Cat. No.99CH37009) ◽

10.1109/leos.1999.811798 ◽

2003 ◽

Author(s):

N. Iwai ◽

H. Shimizu ◽

N. Yamanaka ◽

K. Kumada ◽

T. Mukaihara ◽

...

Keyword(s):

High Temperature ◽

Temperature Characteristic ◽

Low Threshold

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Experimental Study on High-Temperature Characteristic of Compound Crumb Rubber Modified Asphalt and Mixture

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.3195 ◽

2011 ◽

Vol 255-260 ◽

pp. 3195-3199

Author(s):

Lan Wang ◽

Yong Ming Xing ◽

Chun Qing Chang

Keyword(s):

High Temperature ◽

High Speed ◽

Permanent Deformation ◽

Temperature Characteristic ◽

Crumb Rubber ◽

High Temperature Deformation ◽

Temperature Deformation ◽

Modified Asphalt ◽

Compression Creep ◽

Temperature Crack

Compound crumb rubber modified asphalt (CCRMA) is a kind of compound modified asphalt. It is made from putting granulated crumb rubber (GCR) crashed from scrap tires and SBS modifier into matrix asphalt, though shearing by high speed shearing machine and growthing. It has good low temperature crack-resistant attributes, and better preventing high temperature distortion as well. The application of abandoned rubber tire is significant to cutting down on pollution,developing circular economy and protecting the environment. The microstructure of matrix asphalt and CCRMA is observed by SEM. Based on the results of temperature sweep test for CCRMA and uniaxial compression creep test for CCRMA mixture, the high-temperature characteristic of compound modified asphalt and mixture is studied. It is observed that, CCRMA has preferable anti-permanent deformation performance. CCRMA mixture has perferable anti-high temperature deformation performation. In the meantime, the viscous-elastic parameters of CCRMA mixture is obtained by fitting experimental data, it provides a referance for viscoelastic mechanics analyze of bituminous pavement.

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