Investigation of Dependence between Thermal Stability for Nano-Dispersed Metals and Velocity of Flame Spreading and Time Storage

2014 ◽  
Vol 682 ◽  
pp. 357-362 ◽  
Author(s):  
Yulia A. Amelkovich ◽  
Olga B. Nazarenko ◽  
Alexander I. Sechin ◽  
Kristina O. Fraynova
Keyword(s):  
Thermal Stability ◽  
Storage Time ◽  
Electrical Explosion ◽  
Metal Powders ◽  
Flame Spreading ◽  
Long Time ◽  
Thermal Stability Of ◽  
Time Lead ◽  
Selection Of ◽  
Copper Nanopowders

Thermal stability of aluminum, iron and copper nanopowders, produced by electrical explosion of wire during heating in the air, was investigated in the work. Thermal analysis method was used for control of thermal stability for nanodispersed metals in heating in the air. It was shown, that after a long time of storage in air electrical explosion metal nanopowders have had extra active ones. Estimation of velocity of flame spreading in poured layer of the powders was carried out. Quality changes in investigated samples, happened for storage time, lead to increase of flame front length and its line velocity. The results of the researches could be used for diagnostics of fire danger of nanodispersed metals, also for selection of working regimes and provision of fire explosion safety for technologies which produce and apply of nanodispersed metal powders. Time-factor have not effected on criteria concerning the danger of the loads and have not changed its marking.

scholarly journals Effect of Interaction between Mealworm Protein and Myofibrillar Protein on the Rheological Properties and Thermal Stability of the Prepared Emulsion Systems

Foods ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1443
Author(s):  
Tae-Kyung Kim ◽  
Min Hyeock Lee ◽  
Hae In Yong ◽  
Samooel Jung ◽  
Hyun-Dong Paik ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Rheological Properties ◽  
Storage Time ◽  
Myofibrillar Protein ◽  
Scanning Calorimetry ◽  
Meat Emulsion ◽  
Edible Insect ◽  
Emulsion Systems ◽  
Thermal Stability Of

In this study, we investigated the effect of replacing myofibrillar protein (pork ham) with edible insect proteins (Tenebrio molitor L.) in meat emulsion systems and examined the interaction between the two types of proteins. We also evaluated the rheological properties and thermal stability of these meat emulsions. The replacement ratios of myofibrillar protein and edible insect protein were as follows: 100:0 (EI0), 80:20 (EI20), 60:40 (EI40), 40:60 (EI60), 20:80 (EI80), and 0:100 (EI100). The pH, redness, and yellowness of the emulsion systems, after replacing myofibrillar protein with T. molitor protein, significantly increased with T. molitor protein concentrations. In contrast, the lightness, hardness, cohesiveness, gumminess, chewiness, apparent viscosity, and differential scanning calorimetry (DSC) of the emulsion systems decreased significantly with increasing T. molitor protein concentrations. The backscattering values of EI0, EI20, and EI40 decreased evenly in all spots of the dispersions as the storage time increased. Thus, up to 40% of pork myofibrillar protein could be replaced with T. molitor protein in meat emulsion systems. The results also suggest that the interaction between edible insect protein and myofibrillar protein degrades the rheological properties and thermal stability of the meat emulsion systems.

Study of the Effect of Storage Time on the Oxidation and Thermal Stability of Various Biodiesels and Their Blends

2014 ◽  
Vol 28 (2) ◽  
pp. 1081-1089 ◽  
Author(s):  
A. M. Ashraful ◽  
H. H. Masjuki ◽  
M. A. Kalam ◽  
S. M. Ashrafur Rahman ◽  
M. Habibullah ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Storage Time ◽  
Thermal Stability Of

scholarly journals An insight into thermal stability of DNA in hydrated ionic liquids from multi-wavelengths UV Resonance Raman experiments

2021 ◽  
Author(s):  
Barbara Rossi ◽  
Mariagrazia Tortora ◽  
Sara Catalini ◽  
Jacopo Vigna ◽  
Ines Mancini ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Biomedical Applications ◽  
Resonance Raman ◽  
Native Structure ◽  
Uv Resonance Raman ◽  
Alternative Solvents ◽  
Long Time ◽  
Thermal Stability Of ◽  
Insight Into

The utility of Ionic liquids (ILs) as alternative solvents for stabilizing and preserving for a long time the native structure of DNA may be envisaged for biotechnological and biomedical applications...

Tables of Rosseland mean opacities for candidate atmospheres of life hosting free-floating planets

Open Physics ◽  
2010 ◽  
Vol 8 (3) ◽  
Author(s):  
Viorel Badescu
Keyword(s):  
Carbon Dioxide ◽  
Thermal Stability ◽  
Energy Flux ◽  
Molecular Hydrogen ◽  
Temperature And Pressure ◽  
Thermal Stability Of ◽  
Selection Of

AbstractThe existence of life on a free-floating planet is conditioned by the existence of an optically thick atmosphere. This may ensure the long-term thermal stability of a (liquid) solvent on the surface of that body. Requirements to be fulfilled by a hypothetic gas constituent of a free-floating planet atmosphere are studied. The four gases analyzed here (nitrogen, carbon dioxide, methane and ethane) are candidates. They may induce a higher opacity than molecular hydrogen, which has been considered in previous research. The paper deals with preparation of tables of Rosseland mean opacity values. Selection of the ranges of temperature and pressure is guided by life existence considerations. The range of temperatures involved (50 to 650 K) is lower than usually found in the literature. The tables may be useful for studies related to free-floating planets, where the usage of absorption opacity is a straightforward way to compute the energy flux in the atmosphere. Also, the results are useful in all cases where radiation is transferred through dense layers of the gases considered in this paper.

scholarly journals An Experimental Study on the Thermal Stability of Mg2Si/Ni Interface under Thermal Cycling

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3117
Author(s):  
Sung-Jae Joo ◽  
Ji Eun Lee ◽  
Bong-Seo Kim ◽  
Bok-Ki Min
Keyword(s):  
Thermal Stability ◽  
Electrical Contact ◽  
Phase Interface ◽  
Temperature Cycling ◽  
Interfacial Region ◽  
Ternary Compounds ◽  
Thermal Expansion Coefficients ◽  
Long Time ◽  
Expansion Coefficients ◽  
Thermal Stability Of

Mg2Si is a promising eco-friendly thermoelectric material, and Ni is suited for electrical contact on it. In this study, Bi-doped Mg2Si ingots with Ni contacts were fabricated by co-sintering, and thermal stability was investigated by long-time (500 h, 500 cycles) temperature cycling from 25 °C to a peak temperature (Th = 400 and 450 °C) in N2. The as-sintered Ni/Mg2Si interfacial region is a multilayer consisting of Mg3Bi2, a series of MgxSiyNiz ternary compounds (ω, ν, ζ, and η-phases), and MgNi2. In the complex microstructure, the MgNi2 / η-phase interface was vulnerable to stress-induced voiding at Th = 450 °C, which arises from the mismatch of the thermal expansion coefficients. Interfacial voiding was avoided by adding 10 mol% Ag in Ni, which is probably due to the suppression of vacancy migration by the Ag-containing 2nd phase formation at the MgNi2/η-phase interface.

scholarly journals Application of thermal analysis and calorimetry for assessment of safety and quality of nitrogen fertilizers

2018 ◽  
Vol 189 (3) ◽  
pp. 206-217
Author(s):  
Dariusz Poplawski ◽  
Maciej Kaniewski ◽  
Jozef Hoffmann ◽  
Krystyna Hoffmann
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Nitrogen Fertilizers ◽  
Scanning Calorimetry ◽  
Proper Selection ◽  
Thermal Stability Of ◽  
Selection Of ◽  
And Calorimetry

The paper presents the results of studies carried out using differential thermal analysis (DTA) and differential scanning calorimetry (DSC), conjugated with thermogravimetry (TG). Measurements were made for samples with differentiated compositions, mainly consisting of ammonium nitrate with fertilizer purity and compounds that may be present in nitrogen fertilizers as potential additives or contaminants. The possibilities of applied techniques and recommendations concerning proper selection of measurement conditions are described. Furthermore, the method of interpretation of the obtained results is presented, which allows evaluating the thermal stability of the tested mixtures for the safety and quality of nitrogen fertilizers.

REPUBLIC HP 9-4-30

Alloy Digest ◽  
1972 ◽  
Vol 21 (7) ◽  
Keyword(s):  
Thermal Stability ◽  
Fracture Toughness ◽  
Heat Treating ◽  
Good Thermal Stability ◽  
Treated Condition ◽  
Heat Treated ◽  
Long Time ◽  
Heat Treated Condition ◽  
Thermal Stability Of ◽  
Minimum Yield

Abstract REPUBLIC HP 9-4-30 is a heat-treated alloy steel capable of developing minimum yield strengths up to 190,000 psi with superior toughness characteristics. It is designed for sheet, plate, and forging applications, and can be welded in the heat-treated condition. The good thermal stability of this alloy makes it attractive for applications requiring long-time exposures at temperatures up to 700 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-278. Producer or source: Republic Steel Corporation.

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