Rapid thermal cycling

The evolution of T, is just an exercise in mesoscale thermodynamics [13]. These expressions, in combination with (7.54), incorporate concepts of heterogeneous deformation into a eonsistent mierostruetural model. Aspects of local material response under extremely rapid heating and cooling rates are still open to question. An important contribution to the micromechanical basis for heterogeneous deformation would certainly be to establish appropriate laws of flow-stress evolution due to rapid thermal cycling that would provide a physical basis for (7.54). 

Yoon DS, Lee Y-S, Lee Y, Cho HJ, Sung SW, Oh KW, Cha J, Lim G (2002) Precise temperature control and rapid thermal cycling in a micromachined DNA polymerase chain reaction chip. J Micromech Microeng 12 813-823... 

H.S. Noh, PJ. Hesketh, G.C. Frye-Mason, Parylene gas chromatographic column for rapid thermal cycling, J. Microelectromechanical Systems, 11,718 (2002). 

Figure 15 Schematic of the dual Peltier assembly for rapid thermal cycling followed by electrophoretic analysis on-chip. (Reprinted with permission from Ref. 105.)...

Mattis YB, De Jonghe LC, Jacobson CP, and Visco SJ, Metal-supported sohd oxide fuel cell membranes for rapid thermal cycling, Sohd State Ionics 2005 176 443—449. 

Except for KINEL 5518, where the PTFE filler plays a determining role, no dimensional change is greater than 0.65%. Further, water absorption is on KINEL surface only, rather than into core of part. PABMs are thus Ideally suited for operation in hot-water and high-humidity environments and in situations where rapid thermal cycling, from moisture saturated atmospheres, occurs. 

The design process shall consider service temperatures, unacceptable thermal stress due to rapid thermal cycles, other conditions of the boundary material under normal operation, maintenance, testing, and postulated accident conditions and uncertainties in determining ... 

In a conventional-scale device, each cycle takes 5-10 min, and the total time is 150-300 min. However, it is possible to do more rapid thermal cycling in a microfluidic channel owing to the high heat transfer rates possible, thus reducing the analysis time. Figure 7 shows a schematic of a PCR device reported by Kopp et al. [4]. This utilizes a flow channel that repeatedly passes through three different... 

Yao D, Chen S-C, Kim BH (2008) Rapid thermal cycling of injection molds an overview on technical approaches and applications. Adv Polym Technol... 

Weight changes versus time for titanium alloys during rapid thermal cycling in air at850°C (1560 F). The cunreforTi-48AI-2V-4Nb is included for comparison 1-h cycte in air, 300 ml/min. 

Prototype, environment controlled, joule heating, rapid thermal cycling rig (a) schematic of rig design (b) prototype rig bell jar removed (c) prototype rig, within bell jar. 

Statistical analysis of the rapid thermal cycle tests on Kanthal A1 wire/foil samples tested in laboratory air... 

The balanced Taguchi designed test matrix (see Table 20.3), because of its Latin square arrangement is ideally suited for statistical analysis of the rapid thermal cycle test behaviour. The main effects of test temperature, upper dwell time and specimen geometry can be investigated. The three... 

Table 20.4 Measured lifetime data from rapid thermal cycle tests undertaken according to the Taguchi designed test matrix... 

Table 20.5 Main effects table from rapid thermal cycle tests...

An analysis of variance (ANOVA) of this ultra-short dwell, rapid cyclic oxidation dataset confirmed that temperature , hot dwell time and sample geometry were significant factors controlling the cycle life of Kanthal A1 wire and foil samples when rapidly thermal cycled using joule heating. A notable interaction between these main effects was observed, with foil samples failing earlier than wire samples. For many wire samples of 0.4 mm dia. and 0.7 mm diameter no failures were observed up to test termination (1200 cycles) at 1200 and 1250°C. 

Silicate glass was textured using a CO2 laser [330]. The texturing is used to fabricate computer discs of high specific information density made from glass substrates. Laser pulses create a nanotexture on a surface of a glass disc. The process is based on rapid thermal cycles to manipulate the transformation temperature and finally the microstructure of the glass in the zone affected by the heat. 

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