High-temperature Piezoelectric Conversion using Thermally Stabilized Electrospun Polyacrylonitrile Membranes†

2021 ◽  
Author(s):  
Wenyu Wang ◽  
Yide Zheng ◽  
Yue Sun ◽  
xin jin ◽  
Jiarong Niu ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Mechanical Energy ◽  
Polymer Materials ◽  
Energy Harvesters ◽  
Flexible Devices ◽  
Temperature Conditions

Polymer materials with mechanical energy-to-electricity conversion capability at high temperatures are highly desirable to develop energy harvesters, sensors, and other flexible devices for applications in harsh high-temperature conditions but remain...

scholarly journals Review and determining the influence of zeolite on concrete strength under high temperature conditions

2016 ◽  
Vol 5 (3) ◽  
pp. 62
Author(s):  
Mahdi Sharif Jadidi ◽  
Malek Mohammad Ranjbar
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
High Temperatures ◽  
Concrete Strength ◽  
Ultrasonic Speed ◽  
Replacement Level ◽  
Cement Ratio ◽  
Temperature Conditions ◽  
Water To Cement Ratio

in this paper, to verify the effect of zeolite on the strength of concrete and the effect of high temperatures on this type of concrete 5 composition, containing different percentages zeolite (5%, 10%, 15% and 20%) with fixed water to cement ratio for perception of optimized percent of zeolite is made and influence of heat on compressive strength  and ultrasonic  speed waves  was checked . according to tests, it is concluded that the replacement of 10% cement with zeolite at ratio water to cement 0.45 at ages 7, 28 and 90 days, is the optimized replacement level to zeolite.

Synthesis of Ceramics/Polymer Nanocomposites Protonic Conducting Membrane

1998 ◽  
Vol 548 ◽  
Author(s):  
I. Honma ◽  
S. Hirakawa ◽  
J.M. Bae
Keyword(s):  
High Temperature ◽  
Polymer Nanocomposites ◽  
High Temperatures ◽  
Chemical Sensors ◽  
Amorphous Polymer ◽  
Sol Gel ◽  
Hybrid Membrane ◽  
Polymer Materials ◽  
Polyethylene Oxides ◽  
Electrochemical Devices

ABSTRACTHigh temperature protonic conducting polymer membrane provides new technological applications in the electrochemical devices including electrochromic displays, chemical sensors, fuel cells and others. Organic/inorganiaianocomposites membrane consists of SiO2/PEO (Polyethylene Oxides) hybrid are remarkable family of isotropic, amorphous polymer materials, which has been synthesized through sol-gel processes. The hybrid membrane doped with acidic surfactant molecules shows good protonic conductivities at high temperatures above 100C. The membrane was found to be thermally stable at high temperatures because of the inorganic SiO2 framework in the composites matrix.

scholarly journals Comparative analysis of susceptibility to high temperatures of salmonella strains

2021 ◽  
Keyword(s):  
High Temperature ◽  
Research Methods ◽  
High Temperatures ◽  
Biological Properties ◽  
Comparative Characteristic ◽  
Adverse Conditions ◽  
Sick People ◽  
Temperature Conditions ◽  
Heat Resistant ◽  
Resistant Strains

Introduction. Today in the world there is a tendency towards an increase in the incidence of salmonellosis. As well as an increase in the proportion of antibiotic-resistant and various temperature regimes of the pathogen strains. This justifies the urgency of studying this problem, because bacteria of the genus Salmonella are the causative agents of acute infectious intestinal disease – salmonellosis. The aim of the study. To give a comparative characteristic of the sensitivity of a number of Salmonella strains to the action of high temperatures of Salmonella strains. To study the degree of thermal resistance of Salmonella strains at different temperature conditions and exposure periods. One of the components of observations of the circulation of zoonotic Salmonella is the study of changes in their biological properties. One of such properties is the ability to evolve in the environment and the ability to adapt to its adverse conditions by changing the sensitivity of bacteria to temperature and the ability to acquire heat-resistant signs. One of these properties is high stability in the external environment and the ability to adapt to its unfavorable conditions and the sensitivity of bacteria to the action of high temperature conditions, and the ability to acquire thermoresistant signs. Research objectives. Objectives of the study. To determine the ability of current and archival strains of salmonella to the action of the temperature factor and to compare their thermal sensitivity spectra. Materials and methods. Materials and methods. The object of the study were 136 strains of salmonella obtained from the Museum of Pathogenic Microorganisms of the Laboratory of Medical Microbiology of the Institute of Epidemiology and Infectious Diseases LV Gromashevsky NAMS of Ukraine". Research methods: microbiological research methods, as well as statistical analysis of the results. Results. The research results were processed using the licensed program «GraphPad Prism 6» and statistical methods 2-way ANOVA. The data were presented graphically. The significance of the changes was denoted by the symbol ″ * ″ – the probable difference at p ≤ 0.05. It was found that the control strain of Escherichia coli ATCC 25922 was sensitive to all temperature conditions. The results of the study of susceptibility of S. typhimurium strains to the action of temperature in 70ºC showed that on average 75 % of archival strains survived at one-minute exposure, 33,00 % – at 3 minutes of exposure 70ºC, and up to 8,00 % at exposure of 10 minutes. The obtained results indicate an increase in heat resistance among S. Тyphimurium strains isolated in 2006–2012 compared to those isolated in 1996–2005 due to increased adaptive potential of microorganisms and increased chances of survival of bacteria in adverse conditions. The change of sensitivity to the action of high temperatures of Salmonella due to the accumulation of a significant number of heat-resistant strains in the population has been established. An increase in the percentage of moderately sensitive to high temperature actual strains of S. Тyphimurium and S. Еnteritidis in comparison with archival strains is shown. Increased adaptability to high temperatures was found in both S. Еnteritidis strains isolated from sick people and in salmonella strains of rare groups isolated from the environment. Topical strains of S. Еnteritidis and salmonella strains of rare groups were the most heat-resistant. In the course of the study, the author showed an increase in the percentage of moderately sensitive to high temperature actual strains of S. Тyphimurium and S. Еnteritidis in comparison with archival strains. Current strains of S. Еnteritidis and salmonella strains of rare groups were the most heat-resistant. Conclusions. The change of the biological properties of salmonella due to the accumulation of a significant number of heat-resistant strains in the circulating population has been established. An increase in the proportion of moderately sensitive to high temperature actual strains of S. Тyphymurium and S. Еnteritidis in comparison with archival strains is shown. Increased adaptability to the action of high temperatures was found in both S. Enteritidis strains isolated from sick people and in Salmonella strains of rare groups isolated from the environment. Topical strains of S. Еnteritidis and salmonella strains of rare groups turned out to be the most heat-resistant. The results of studies to assess the sensitivity of Salmonella to high temperatures indicate changes in the genotype of bacteria and as the result of evolutionary changes aimed at preserving the genus.

High Temperature n- and p-type Doped Microcrystalline Silicon Layers Grown by VHF PECVD Layer-by-Layer Deposition

2003 ◽  
Vol 762 ◽  
Author(s):  
A. Gordijn ◽  
J.K. Rath ◽  
R.E.I. Schropp
Keyword(s):  
Activation Energy ◽  
High Temperature ◽  
High Temperatures ◽  
Continuous Wave ◽  
Hydrogen Plasma ◽  
Silicon Layer ◽  
Dark Conductivity ◽  
High Deposition Rate ◽  
Layer By Layer ◽  
Microcrystalline Silicon

AbstractDue to the high temperatures used for high deposition rate microcrystalline (μc-Si:H) and polycrystalline silicon, there is a need for compact and temperature-stable doped layers. In this study we report on films grown by the layer-by-layer method (LbL) using VHF PECVD. Growth of an amorphous silicon layer is alternated by a hydrogen plasma treatment. In LbL, the surface reactions are separated time-wise from the nucleation in the bulk. We observed that it is possible to incorporate dopant atoms in the layer, without disturbing the nucleation. Even at high substrate temperatures (up to 400°C) doped layers can be made microcrystalline. At these temperatures, in the continuous wave case, crystallinity is hindered, which is generally attributed to the out-diffusion of hydrogen from the surface and the presence of impurities (dopants).We observe that the parameter window for the treatment time for p-layers is smaller compared to n-layers. Moreover we observe that for high temperatures, the nucleation of p-layers is more adversely affected than for n-layers. Thin, doped layers have been structurally, optically and electrically characterized. The best n-layer made at 400°C, with a thickness of only 31 nm, had an activation energy of 0.056 eV and a dark conductivity of 2.7 S/cm, while the best p-layer made at 350°C, with a thickness of 29 nm, had an activation energy of 0.11 V and a dark conductivity of 0.1 S/cm. The suitability of these high temperature n-layers has been demonstrated in an n-i-p microcrystalline silicon solar cell with an unoptimized μc-Si:H i-layer deposited at 250°C and without buffer. The Voc of the cell is 0.48 V and the fill factor is 70 %.

NICROFER 5520 Co

Alloy Digest ◽  
1995 ◽  
Vol 44 (3) ◽  
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Temperatures ◽  
Heat Treating ◽  
High Temperature Corrosion ◽  
Creep Properties ◽  
Nickel Chromium ◽  
Temperature Performance

Abstract NICROFER 5520 Co is a nickel-chromium-cobalt-molybdenum alloy with excellent strength and creep properties up to high temperatures. Due to its balanced chemical composition the alloy shows outstanding resistance to high temperature corrosion in the form of oxidation and carburization. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-480. Producer or source: VDM Technologies Corporation.

CARLSON ALLOY C601

Alloy Digest ◽  
1994 ◽  
Vol 43 (7) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
High Temperatures ◽  
Stress Corrosion Cracking ◽  
Heat Treating ◽  
Resistance To Stress ◽  
Extended Exposure ◽  
Sulfur Containing

Abstract Carlson Alloy C601 is characterized by high tensile, yield and creep-rupture strengths for high temperature service. The alloy is not embrittled by extended exposure to high temperatures and has excellent resistance to stress-corrosion cracking, to carburizing, nitriding and sulfur containing environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on forming, heat treating, machining, and joining. Filing Code: Ni-458. Producer or source: G.O. Carlson Inc.

INCOTHERM TD

Alloy Digest ◽  
2005 ◽  
Vol 54 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
High Temperatures ◽  
Rare Earths ◽  
Temperature Performance

Abstract Incotherm TD is a thermocouple-sheathing alloy with elements of silicon and rare earths to enhance oxidation resistance at high temperatures. This datasheet provides information on composition, physical properties, and tensile properties as well as deformation. It also includes information on high temperature performance and corrosion resistance as well as forming. Filing Code: Ni-628. Producer or source: Special Metals Corporation.

HASTELLOY ALLOY X

Alloy Digest ◽  
1954 ◽  
Vol 3 (12) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
High Temperatures ◽  
Heat Treating ◽  
Operating Conditions ◽  
Molybdenum Alloy ◽  
High Temperature Strength ◽  
Nickel Chromium

Abstract HASTELLOY Alloy X is a nickel-chromium-iron-molybdenum alloy recommended for high-temperature applications. It has outstanding oxidation resistance at high temperatures under most operating conditions, and good high-temperature strength. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on forming, heat treating, and machining. Filing Code: Ni-14. Producer or source: Haynes Stellite Company.

KUBOTA ALLOY HT

Alloy Digest ◽  
2011 ◽  
Vol 60 (11) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
Oxidation Resistance ◽  
High Temperatures ◽  
Temperature Performance ◽  
Iron Chromium

Abstract Kubota Alloy HT is an iron-chromium-nickel alloy that has both strength and oxidation resistance at high temperatures. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance as well as casting and joining. Filing Code: SS-1108. Producer or source: Kubota Metal Corporation, Fahramet Division.

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