Characterization of Material in a Rotating Disc Subjected to Thermal Gradient

Abstract. The static (parallel-plate thermal-gradient) diffusion chamber (SDC) was one of the first instruments designed to measure cloud condensation nuclei (CCN) concentrations as a function of supersaturation. It has probably also been the most widely used type of CCN counter. This paper describes the detailed experimental characterization of a SDC CCN counter, including calibration with respect to supersaturation and particle number concentration. In addition, we investigated the proposed effect of lowered supersaturation because of water vapor depletion with increasing particle concentration. The results obtained gives a larger understanding why and in which way it is necessary to calibrate the SDC CCN counter. The calibration method is described in detail as well. The method can, in parts, be used for calibrations also for other types of CCN counters. We conclude the following: 1) it is important to experimentally calibrate SDC CCN counters with respect to supersaturation, and not only base the supersaturation on the theoretical description of the instrument; 2) the number concentration calibration needs to be performed as a function of supersaturation, also for SDC CCN counter using the photographic technique; and 3) we observed no evidence that water vapor depletion lowered the supersaturation.

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Characterization of Ethylene/α-Olefin Copolymers Using High-Temperature Thermal Gradient Interaction Chromatography

Macromolecular Chemistry and Physics ◽

10.1002/macp.201300736 ◽

2014 ◽

Vol 215 (5) ◽

pp. 465-475 ◽

Cited By ~ 17

Author(s):

Abdulaal Z. Al-Khazaal ◽

João B. P. Soares

Keyword(s):

High Temperature ◽

Thermal Gradient

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X-ray characterization of bulk InP:S crystals crown by LEC in a low thermal gradient

Conference Proceedings. 2000 International Conference on Indium Phosphide and Related Materials (Cat. No.00CH37107) ◽

10.1109/iciprm.2000.850352 ◽

2002 ◽

Author(s):

D.F. Bliss ◽

G. Bryant ◽

G. Antypas ◽

B. Raghothamachar ◽

G. Dhanaraj ◽

...

Keyword(s):

Thermal Gradient ◽

X Ray

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Design and characterization of a horizontal thermal gradient cloud condensation nucleus spectrometer

Journal of Aerosol Science ◽

10.1016/j.jaerosci.2007.10.004 ◽

2008 ◽

Vol 39 (1) ◽

pp. 30-39 ◽

Cited By ~ 3

Author(s):

Dan Zhang ◽

Katharine F. Moore ◽

Randall R. Friedl ◽

Ming-Taun Leu

Keyword(s):

Thermal Gradient ◽

Condensation Nucleus ◽

Cloud Condensation Nucleus

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Characterization of Delamination in Laser Microtransfer Printing

Journal of Micro and Nano-Manufacturing ◽

10.1115/1.4026238 ◽

2014 ◽

Vol 2 (1) ◽

Cited By ~ 4

Author(s):

Ala'a M. Al-okaily ◽

John A. Rogers ◽

Placid M. Ferreira

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Laser Heating ◽

Thermal Gradient ◽

Heterogeneous Materials ◽

Element Model ◽

Extensive Study ◽

Materials Integration ◽

Gradient Fields

Microtransfer printing is rapidly emerging as an effective method for heterogeneous materials integration. Laser microtransfer printing (LMTP) is a noncontact variant of the process that uses laser heating to drive the release of the microstructure from the stamp. This makes the process independent of the properties or preparation of the receiving substrate. In this paper, an extensive study is conducted to investigate the capability of the LMTP process. Furthermore, a thermomechanical finite element model (FEM) is developed, using the experimentally observed delamination times and absorbed powers, to estimate the delamination temperatures at the interface, as well as the strain, displacement, and thermal gradient fields.

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