Topic
Calorimeter
About: Calorimeter is a research topic. Over the lifetime, 5878 publications have been published within this topic receiving 77157 citations.
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01 Jan 1972-Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
TL;DR: Principles and detailed procedures are described for measuring laser energy and power in terms of electrical energy based on voltage, resistance, and frequency standards based on isoperibol calorimeter.
Abstract: Principles and detailed procedures are described for measuring laser energy and power in terms of electrical energy based on voltage, resistance, and frequency standards. The construction of a small isoperibol calorimeter used for the measurements is described. The calorimeter will accommodate 0.01 to 20 J and 4 × 10-5 to 1 W cw and is limited to a maximum pulse intensity of 0.1 J/cm2. The standard deviation of comparison measurements using two calorimeters and a beam splitter is 0.08 percent when the smaller energy input is not less than 0.3 J. The estimated limits of systematic error for one calorimeter are ± 1.0 percent of the laser energy measured by the calorimeter.
65 citations
TL;DR: In this paper, the difference in thermal stability of Li/LiFePO4| half cells with liquid and solid polymer electrolytes was presented, and the dependence of those parameters with respect to the SOC was also presented.
64 citations
TL;DR: A self-accelerating decomposition temperature (T SADT) is defined as the minimum ambient air temperature at which a reactive material of specified stability decomposes in a specified commercial package in a period of 7 days or less as discussed by the authors.
Abstract: A self-accelerating decomposition temperature ( T SADT is the minimum ambient air temperature at which a reactive material of specified stability decomposes in a specified commercial package in a period of 7 days or less. Values for T SADT are determined to decide whether a substance should be subject to temperature control during transport. Values of T SADT calculated using the Accelerating Rate Calorimeter (ARC) and techniques suggested by Wilberforce and the authors are compared to those measured by oven stability testing. The methodology and the advantages of using the ARC to obtain T SADT values are discussed.
64 citations
TL;DR: In this article, a major discrepancy in the literature concerning the enthalpy of formation of GaN has been resolved using oxidative oxide melt solution calorimetry, where four samples of differing nitrogen contents were measured by dropping them into molten 3Na2O·4MoO3 in a calorimeter at 975 K with oxygen gas bubbling through the solvent.
Abstract: A major discrepancy in the literature concerning the enthalpy of formation of GaN has been resolved using oxidative oxide melt solution calorimetry. Four samples of differing nitrogen contents were measured by dropping them into molten 3Na2O·4MoO3 in a calorimeter at 975 K with oxygen gas bubbling through the solvent. The samples were characterized by X-ray diffraction, chemical analysis, transmission electron microscopy, particle size analysis, and BET measurements. The enthalpy of drop solution (kJ/g) varied approximately linearly with nitrogen content. Extrapolated to stoichiometric GaN, the data yield a value of −156.8 ± 16.0 kJ/mol for the standard enthalpy of formation from the elements at 298 K. The relatively large error reflects the deviation of individual points from the straight line rather than uncertainties in each set of data for a given sample. This new directly measured enthalpy of formation is in excellent agreement with that obtained from the temperature dependence of the equilibrium pre...
64 citations
TL;DR: In this article, a phase transition thermometer combined with a SQUID readout was used for low temperature calorimetric particle detectors, achieving an energy resolution of ΔE E = 1.2% for irradiation with 5.8 MeV α -particles.
64 citations