Method for measuring the standard heat of decomposition of materials

2012 ◽  
Vol 545 ◽  
pp. 34-47 ◽  
Author(s):  
Gaurav Agarwal ◽  
Brian Lattimer
Keyword(s):  
Standard Heat ◽  
Heat Of Decomposition

Energetic Characterization of Decomposing Sample Using Simultaneous Thermal Analysis

2012 ◽  
Author(s):  
Gaurav Agarwal ◽  
Brian Lattimer
Keyword(s):  
Mathematical Models ◽  
Simultaneous Thermal Analysis ◽  
Inert Atmosphere ◽  
Initial Mass ◽  
Standard Heat ◽  
Heat Of Decomposition ◽  
Energetic Characterization ◽  
Constant Quantity ◽  
Gas Products ◽  
Heat Of Evaporation

A simultaneous thermogravimetric analyzer was used to investigate the gravimetric and energetic behavior of a decomposing sample under inert atmosphere. Materials tested in the study included liquid chemicals, polymers and composite samples. Mathematical models were developed from the first law of thermodynamics to quantify the energetic characteristics of a decomposing sample. Along with the effect of evolved gas products, the temperature dependent thermal and physical properties were included in the development of the mathematical models. Models were used to obtain the heat of melting, standard heat of decomposition, heat of decomposition, and heat of gasification of the solid materials. It was determined that the heat of decomposition of a sample is different than the area difference of the apparent and sensible heat flow curves, an approach that is currently used in the literature. The standard heat of decomposition was measured and validated against the standard heat of evaporation of known chemicals. The standard heat of decomposition of a sample was found to be a constant quantity, irrespective of the sample heating rate, initial mass of the sample and the inert content (ash) in the initial mass of the sample. Thus, the standard heat of decomposition is proposed as a unique energetic property of a sample.

ChemInform Abstract: Standard Heat of Formation of Some Diacetylene Derivatives

ChemInform ◽  
2010 ◽  
Vol 24 (1) ◽  
pp. no-no
Author(s):  
V. A. LUK'YANOVA ◽  
S. M. PIMENOVA ◽  
L. P. TIMOFEEVA ◽  
M. P. KOZINA ◽  
V. P. KOLESOV ◽  
...  
Keyword(s):  
Heat Of Formation ◽  
Standard Heat

scholarly journals Synthesis, Spectral Study and Theoretical Treatment of 2-(2-(4-bromocyclohexa-1, 3-dienyl)-4-oxo-2H- benz [1, 3] oxazin-3(4H)-ylamino)-2-oxoethyl carbamimidothioate and Derivatives.

2022 ◽  
Vol 5 (1) ◽  
pp. 1-7
Author(s):  
Asmaa J.i AL-Lame ◽  
Wafaa F. Rodhan ◽  
Nafeesa J. Kadhim ◽  
Shahed K. Taher
Keyword(s):  
Binding Energy ◽  
Electrostatic Potential ◽  
Vibrational Spectra ◽  
Spectral Study ◽  
Heat Of Formation ◽  
Theoretical Treatment ◽  
Reactive Site ◽  
Standard Heat ◽  
Pm3 Method

The standard heat of formation (ΔHof) and binding energy (ΔEb) for the free compound and their derivatives are calculated by using the PM3 method at 273K of Hyperchem.-8.07 program. The compound is more stable than their derivatives. furthermore to investigate the reactive site of the molecules the electrostatic potential of free derivatives is measured and pm3 is used to evaluate the vibrational spectra of the free derivatives, the frequencies are obtained approximately agreed with those values experimentally found; in addition, the calculation helps to assign clearly the most diagnostic bands .

scholarly journals CREEP RUPTURE LIFE OF PRE-STRAINED SUPERALLOY N07080

2021 ◽  
Vol 9 (10) ◽  
pp. 1167-1176
Author(s):  
Omer Beganovic ◽  
Keyword(s):  
Stress Concentration ◽  
Grain Boundaries ◽  
Rupture Life ◽  
Warm Rolling ◽  
Creep Rupture ◽  
Cavity Nucleation ◽  
Standard Heat ◽  
Creep Cavity ◽  
Heat Treated

The creep of the pre-strained superalloy N07080 is described in this work. The pre-strain was achieved by warm rolling at 1050 oC.-The warm rolling was performed due to additional strengthening, i.e increasing of the superalloy hardness.-The pre-strain drastically reduces the creep rupture life of the superalloy compared to the creep rupture life of the standard heat treated superalloy.-The drastic reductionof the creep rupture life is result of rapid creep cavity nucleation on stress concentration sites along primary grain boundaries of the pre-strained superalloy.-Recrystallization eliminates potential sites for rapid cavity nucleation and prolongates the creep rupture life.

Solving Environmental Problems by Recycling the Cut Chalk To Lime in a Rotating Furnace

2021 ◽  
Vol 25 (2) ◽  
pp. 48-53
Author(s):  
B.P. Yur’ev ◽  
V.A. Dudko
Keyword(s):  
Specific Heat ◽  
Fuel Consumption ◽  
Rotary Kiln ◽  
Thermodynamic Calculation ◽  
Environmental Problems ◽  
High Quality ◽  
Heat Of Decomposition ◽  
Rotating Furnace ◽  
Optimal Fuel Consumption

A technology of processing chalk from the Lebedinskoye deposit into high quality lime by roasting in a rotary kiln is proposed. A procedure has been developed for the thermodynamic calculation of the specific heat of decomposition of carbonates contained in chalk. The material and heat balances of the operating rotary kiln have been compiled. All the main parameters of its operation and the optimal fuel consumption for chalk processing have been determined.

Rough estimates on the scalar heat kernel

2011 ◽  
Author(s):  
Jean-Michel Bismut
Keyword(s):  
Wave Equation ◽  
Heat Equation ◽  
Heat Kernel ◽  
Heat Kernels ◽  
Hypoelliptic Operator ◽  
Uniform Bounds ◽  
Standard Heat ◽  
Probabilistic Construction

This chapter establishes rough estimates on the heat kernel rb,tX for the scalar hypoelliptic operator AbX on X defined in the preceding chapter. By rough estimates, this chapter refers to just the uniform bounds on the heat kernel. The chapter also obtains corresponding bounds for the heat kernels associated with operators AbX and another AbX over ̂X. Moreover, it gives a probabilistic construction of the heat kernels. This chapter also explains the relation of the heat equation for the hypoelliptic Laplacian on X to the wave equation on X and proves that as b → 0, the heat kernel rb,tX converges to the standard heat kernel of X.

Theory and Application of Stage-by-Stage Evaluation for Steam Turbine State-Line

1984 ◽  
Vol 28 (04) ◽  
pp. 240-260
Author(s):  
Robert Latorre ◽  
Zisimos Mourelatos ◽  
Efstratios Nikolaidis
Keyword(s):  
Theoretical Model ◽  
Computer Program ◽  
Steam Turbine ◽  
Heat Balance ◽  
Standard Heat ◽  
Balance Calculation ◽  
Calculation Results ◽  
Design Case ◽  
The Heat Balance

A theoretical model of a steam turbine is formulated based on idealized Curtis and reaction stages to obtain expressions for a stage-by-stage evaluation of the turbine state line. Using typical stage geometries and corrections a computer program was developed to size the turbine and evaluate its state line at design conditions. A comparison of the heat balance made with the stage-by-stage state line and the standard heat balance is presented. For the design case of 30 000 shp it is shown that the differences in the heat balance calculation results are within ±0.5 percent.

Analyses on Heat-coagulated Blood and Serum

1967 ◽  
Vol 13 (11) ◽  
pp. 970-975 ◽  
Author(s):  
Morris London ◽  
Ida A Freiberger ◽  
Jesse H Marymont
Keyword(s):  
High Temperature ◽  
Standard Heat

Abstract The "standard" heat-clot method of London and Marymont is shown here to be applicable to the determination of creatinine. With this method creatinine can be assayed in very small quantities of serum, and only a conventional laboratory reagent, alkaline picrate, is required. A new fast technic has been developed in which extraction of the clot is carried out for only 10 min. at a high temperature. In addition, the heat-clot method used in conjunction with Lloyd's reagent lends itself to the determination of "true" creatinine values.

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