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Tuesday, May 19, 2020 | History

3 edition of In-situ thermal conductivity measurements found in the catalog.

In-situ thermal conductivity measurements

In-situ thermal conductivity measurements

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Published by State of Alaska Dept. of Transportation and Public Facilities, Division of Planning and Programming, Research Section in Fairbanks, Alaska .
Written in English


Edition Notes

Microfiche. Anchorage : Arctic Environmental Information and Data Center, 1983? 1 microfiche : negative ; 11 x 15 cm.

StatementRonald T. Atkins.
Classifications
LC ClassificationsMicrofiche 84/2037 (T)
The Physical Object
FormatMicroform
Pagination38 p.
Number of Pages38
ID Numbers
Open LibraryOL2958926M
LC Control Number84202441

The temperature ranges from to °C with an average of °C in the study area. The calculated thermal resistivity from an algorithm was found to vary from to °C-cm/W with an average of °C-cm/W which is close to the thermal resistivity values measured in by: 6. BS ISO “Thermal insulation – Building elements – In-situ measurement of thermal resistance and thermal transmittance” provides the description of a method which allows U- values of walls in existing dwellings to be established by in-situ Size: KB.

  In-situ measurements of material thermal parameters for accurate LED lamp thermal modelling Abstract: This work deals with the extraction of key thermal parameters for accurate thermal modelling of LED lamps: air exchange coefficient around the lamp, emissivity and thermal conductivity of all lamp parts. As a case study, an 8W retrofit lamp is.   Herein, we propose a new method for estimating in situ porosity from downhole electrical resistivity log data that evaluates in situ porosity and thermal structure simultaneously using correlations between the porosity and resistivity, and between the porosity and thermal conductivity that were established based on laboratory : Suguru Yabe, Rina Fukuchi, Yohei Hamada, Gaku Kimura.

There are a number of possible ways to measure thermal conductivity, each of them suitable for a limited range of materials, depending on the thermal properties and the medium classes of methods exist to measure the thermal conductivity of a sample: steady-state and non-steady-state (or transient) methods. Room-temperature liquid metals (LMs) are attractive candidates for thermal interface materials (TIMs) because of their moderately high thermal conductivity and liquid nature, which allow them to conform well to mating surfaces with little thermal resistance. However, gallium-based LMs may be of concern due to the gallium-driven degradation of many metal microelectronic by:


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In-situ thermal conductivity measurements Download PDF EPUB FB2

In-situ thermal conductivity measurements (FHWA-AK-RD) [Ronald T Atkins] on *FREE* shipping on qualifying : Ronald T Atkins. The results described in this paper demonstrate the capability to measure in situ the thermal conductivity of ash deposits formed in the MFC.

The measurement technique does not disturb the In-situ thermal conductivity measurements book physical structure of the deposit. This capability is significant because the structure is thought to largely determine the thermal conductivity of the deposit.

Cited by: 1. We would like to show you a description here but the site won’t allow more. In Situ Measurement of Ground Thermal Conductivity: A Dutch Perspective Henk J.L.

Witte, Ph.D. Guus J. van Gelder Jeffrey D. Spitler, Ph.D., P.E. Member ASHRAE Henk J.L. Witte is a senior geo-information science consultant and Guus J. van Gelder is a founding partner at Groenholland, Amsterdam, the Size: KB. A temperature controlled instrumented capsule has been irradiated in the RB* position of the high flux isotope reactor (HFIR) at the Oak Ridge National Laboratory in order to perform in situ thermal conductivity measurements of monolithic ceramics and composite materials during neutron irradiation.

This determination of thermal conductivity utilizes a temperature gradient technique Cited by: 8. Different ways of determining the thermal conductivity of sedimentary rocks are discussed, including laboratory measurements on cuttings and core samples, in situ direct measurements, inference from well log measurements of travel time, gamma-ray activity and so forth, conversion of seismic reflection travel time to thermal resistance, and Cited by:   In this paper, a new method for in situ thermal conductivity measurements were established in diamond anvil cells (DAC) and achieve measurements at high pressure and high temperature under steady heat flow conditions.

In this method, the traditional heat flux calibration was replaced by temperature measurement of anvils and finite element : Donghui Yue, Yang Gao, Lin Zhao, Yalan Yan, Tingting Ji, Yonghao Han, Chunxiao Gao. In situ measurements of thermal conductivity and diffusivity of bedrock were investigated with the aid of a literature survey and theoretical simulations of a measurement system.

According to the surveyed literature, in situ methods can be divided into 'active' drill hole methods, and 'passive'. Based on the detailed drillers logs for each borehole, the estimated thermal conductivity of the site was in the range to W/m, K.

However, when the in-situ test was carried out, the thermal conductivity value for the site was found to be in the range to W/m, K. content and other thermal properties of soil using in-situ tem-perature measurements and by exploiting the mathematical model.

A variety of inverse modeling techniques that recover the thermal properties of soil are known. Many of them rely on the commonly called source methods (Jaeger and Sass, ), in which temperature response due to heating is mea-Cited by: For the ex-situ measurements, the thermal conductivity and the thicknesses of the supercapacitor material layers were measured individually in order to determine the corresponding thermal.

The in situ thermal conductance was calculated using the following equation: (2) C = ∑ j = 1 m q j ∑ j = 1 m T s o j − T s i j = 1 R. Thermal transmittance (U-value) The in situ thermal transmittance (air to air) was calculated using the following equation: (3) U = ∑ j = 1 m q j ∑ j = 1 m T o j − T i j.

Total thermal resistance (R T-value)Cited by: The mineralogical data available from induced gamma ray spectroscopy logs, when combined with known mineral thermal conductivities in a model for the thermal conductivity of a crystalline aggregate, enable the in situ application of a laboratory estimation technique and yield continuous conductivity by: Thermal conductivity is a measure of heat transferred across a specific medium.

In refractories, thermal conductivity is a function temperature and typically the thermal conductivity is higher at elevated temperatures. In castable refractories, with cementitious bonds, thermal conductivity is also affected by the hydrated calcium aluminate cement.

Laboratory measurements of water‐saturated samples under in situ conditions, combined with in situ measurements and judicious use of calculations based on mineralogy and well log derived physical properties, can aid in the accurate characterization of thermal conductivity in deep by: Thermtest has been measuring thermal conductivity, thermal diffusivity, thermal resistance, and specific heat for more than a decade.

With more than satisfied customers, our unique combination of advanced thermal conductivity testing equipment for the laboratory, portable thermal conductivity meters for the field, thermal analysis instruments and thermal conductivity testing laboratory. About Cookies, including instructions on how to turn off cookies if you wish to do so.

By continuing to browse this site you agree to us using cookies as described in About Cookies. Notice: Wiley Online Library will be unavailable on Saturday 27th February from GMT / EST / SGT for essential ies for the inconvenience.

Page - Standard Method of Test for Thermal Conductivity of Materials by Means of the Guarded Hot Plate (adopted July by ASHVE, ASTM Designation C ). Appears in books from Bibliographic information5/5(1).

R aw thermal conductivity measurements on (A) in situ melanoma and (B) invasive melanoma. Red Red and black lines show lesion and health y skin data, respectively. Raw thermal conductivity measurements on (A) in situ melanoma and (B) invasive melanoma.

Red and black lines show lesion and healthy skin data, respectively. Red and black lines show lesion and Cited by: 2. Home > Journals > Canadian Journal of Earth Sciences > List of Issues > Volume 8, Number 1, January > Analysis of Heat Flow Data—in situ Thermal Conductivity Measurements Article TOC Next»Cited by: IN-SITU MEASUREMENTS OF LUNAR HEAT FLOW duced profiles are not necessarily unique.

Two features of the profiles shown are essen-tial to explain the data: 1. The upper 1 to 2 cm must have an ex-tremely low thermal conductivity, and this conductivity must be temperature-dependent.

The conductivity at the mean surface temperature ( K)File Size: 5MB.Early development of a system combining vibrocoring with in situ thermal conductivity measurement has proved reasonably succesfull but in some soil types still rendered anomalous results.

This paper discusses the development of a new measurement system which combines traditional CPT pushing- and measurement technology with an existing well Author: G.T. de Vries, R. Usbeck.