THE INFLUENCE OF TEMPERATURE ON COEFFICIENT OF MAGNETIC SUSCEPTIBILITY χ OF FERRO-OILS WITH DIFFERENT CONCENTRATIONS OF MAGNETIC PARTICLES

Tribologia ◽  
2016 ◽  
Vol 269 (5) ◽  
pp. 21-30 ◽  
Author(s):  
Marcin FRYCZ
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Particles ◽  
Operating Temperature ◽  
Measurement Data ◽  
Main Subject ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Physicochemical Features

In this paper, the authors presented research concerning the determination of the relation between magnetic susceptibility coefficient χ of ferro-oil and temperature changes. The tests were conducted on the ferro-oil samples of various, chosen magnetic particles concentrations: 1%, 2%, 4%, 6%, and 8%. In accordance with the conclusions resulting from Curie-Weiss equation, the values of magnetic susceptibility χ depend on the physicochemical features of considered material, including the magnitude and amount (concentration) of magnetic particles and physical properties of its environment, i.e. the kind and direction of magnetic field and also on the operating temperature, which is the main subject of conducted tests in this paper. This article presents the structure of the bench used for experimental designation of magnetic susceptibility coefficient in relation to temperature changes of tested ferro-oil. Moreover, the authors demonstrated a method enabling the determination of these values from obtained measurement data, conducted the analysis of obtained results and presented the conclusions.

scholarly journals The Influence of Temperature on the Hydration Rate of Cements Based on Calorimetric Measurements

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3025
Author(s):  
Włodzimierz Kiernożycki ◽  
Jarosław Błyszko
Keyword(s):  
Curing Temperature ◽  
Empirical Formulas ◽  
Curing Conditions ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Hydration Rate ◽  
Calorimetric Measurements ◽  
Influence Of Temperature On ◽  
Two Parameters

The study presents results of calorimetric tests of three different cements. Two Ordinary Portland cements, CEM I 52.5 R and CEM I 42.5 R, and one Blastfurnace cement, CEM III/A 42.5 N LH/HSR/NA, were analysed. The analysis has shown that the empirical formulas derived based on the results can successfully replace the Arrhenius formula in determination of the hydration rate in relation to curing temperature. It was proven that the hydration rate in relation to the curing temperature changes with the progression of hydration. The study introduces an En coefficient which determines the influence of curing temperature on generation of heat. Results of the study have shown that the value of En is not constant and changes with the progression of hydration process. Proposed method of numerical modelling of the total heat generated and generation rate based on obtained results allows for the calculation of those two parameters for any curing conditions.

Flow Behaviors of High Acyl Gellan Aqueous Solutions as Affected by Temperature, and Calcium and Gellan Concentrations

2008 ◽  
Vol 4 (5) ◽  
Author(s):  
Yiqun Huang ◽  
Pawan Singh Takhar ◽  
Juming Tang ◽  
Barry G Swanson
Keyword(s):  
Shear Rate ◽  
Aqueous Solutions ◽  
Apparent Viscosity ◽  
Flow Resistance ◽  
Effect Of Temperature ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Rheological Behaviors ◽  
Low Concentrations ◽  
Influence Of Temperature On

Rheological behaviors of high acyl (HA) gellan are not well understood partially because of its relatively late commercialization compared to low acyl gellan. The objective of this study was to investigate the effect of temperature (5-30 °C), calcium (0, 1 and 10 mM) and gellan concentrations (0.0044-0.1000% w/v) on the flow behaviors of high acyl gellan aqueous solutions using rheological tests. Gellan solutions with 0 or 1 mM added Ca++ exhibited shear thinning behavior at gellan concentrations above 0.0125%. The influence of temperature on apparent viscosity (shear rate, 100 s-1) of gellan solutions can be described with an Arrhenius relationship. The apparent viscosity of gellan solution at low concentrations was more sensitive to temperature changes. The addition of Ca++ led to a decrease in flow resistance for a dilute gellan solution (<0.0125%), but an increased resistance for a relatively concentrated gellan solution (>0.0125%).

scholarly journals Pengaruh Ketinggian Tempat dan Curah Hujan Pada Penyakit Diare (Studi Kasus: Kabupaten Bogor)

Agromet ◽  
2018 ◽  
Vol 28 (1) ◽  
pp. 33
Author(s):  
Muhammad Syafei ◽  
Rini Hidayati
Keyword(s):  
Sea Level ◽  
Negative Influence ◽  
Positive Influence ◽  
The Other ◽  
Threshold Values ◽  
Climate Classification ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Very High

<em>This study aimed to determine the effect of altitude and rainfall on the incidence of disease ( IR ) diarrhea, and to obtain threshold values ​​of rainfall that often cause diarrhea. Determination category of normal rate of diarrhea IR is based on diarrhea IR by DINKES Bogor in the amount of 20-25/1000 population per year, while the determination of precipitation category is based on consideration of Oldeman climate classification. The results showed that there were two districts with very high levels of vulnerability i.e.  Cisarua and Cijeruk, while the other regions only at a moderate level. The negative influence of altitude (or positive influence of temperature) on the IR will be evident if the analysis is separated between in the highlands (&gt; 600 asl) and the lowlands (&lt; 600 asl). This influence is significant, especially at altitudes above 600 meters above sea level. The correlation of the precipitation is significant negative linear to the incidence of diarrhea in the district Cisarua, Cibinong, Jonggol, and Jasinga. In districts Cibinong, Jonggol, and Jasinga, precipitation should be anticipated in the range of 100-200 mm/month, where moderate IR often occurs, while in the district Cisarua, is in the range of precipitation 300-400 mm/month, where high IR often occurs.</em>

scholarly journals Influence of temperature on corrosion resistance of austenitic stainless steel in cl− containing solutions

2019 ◽  
Vol 25 (25) ◽  
pp. 43-46
Author(s):  
Viera Zatkalíková ◽  
Lenka Markovičová
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
External Factor ◽  
Corrosion Behaviour ◽  
Local Damage ◽  
Corrosion Attack ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

Abstract Temperature is considered a complicated external factor of the susceptibility of stainless steels to the pitting. This paper deals with the corrosion behaviour of AISI 316Ti stainless steel in temperature range 22 - 80°C in aggressive chloride environments (3 and 5% FeCl3 solutions). The corrosion resistance of tested steel is evaluated on the base of results of exposure immersion tests and cyclic potentiodynamic tests. According to the obtained results the resistance of AISI 316Ti to the pitting is markedly affected by temperature changes in the range 22 – 80°C. Intensity of corrosion attack increases with the rise of Cl− concentration. Gentle changes of temperature and Cl− concentration cause significant differences in character of local damage. The appearance of pitted surfaces changes with the rise of the temperature (a density of pitting increases, a size of pits decreases). The strongest change in appearance is observed between 40 and 50ºC.

Temperature Coefficient of Vulcanization on a Litharge Compound

1929 ◽  
Vol 2 (4) ◽  
pp. 505-516
Author(s):  
J. R. Sheppard
Keyword(s):  
Temperature Coefficient ◽  
Experimental Conditions ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Exact Relationship

Abstract THE influence of temperature on vulcanization is too well known to require emphasis—it has been generally recognized for quite a number of years that the relation between temperature and time for ordinary curing ranges was logarithmic although there has been no unanimity as to the exact relationship. This doubtless is in part due to the varying experimental conditions employed by the investigators and possibly in some cases to less precise measurements. Table I, a partial bibliography, shows some values for the temperature coefficient which have been obtained and the conditions used. It will be seen that values ranging from 8 to 25 have been reported for the coefficient (in terms of degrees Fahrenheit required to double the rate of cure). It is the purpose of this paper to recount the writer's determination of the temperature coefficient for a given litharge stock in press cures—it is not safe perhaps to infer from the present results what might hold under certain other conditions.

scholarly journals Determination Of The Position Of The Optoelectronic Gimbal Using MEMS Sensors

2015 ◽  
Vol 36 (1) ◽  
pp. 139-146
Author(s):  
Justyna Sokołowska ◽  
Janusz Błaszczyk
Keyword(s):  
Unmanned Aircraft ◽  
Unmanned Aircraft Systems ◽  
Mems Sensors ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Calibration Process ◽  
Aircraft Systems

AbstractThe paper describes the use of MinIMU-9 v3 sensors to determine changes in the position of a cheap, stabilised optoelectronic gimbal for unmanned aircraft systems. The sensors calibration process, the influence of temperature changes on their readings, and recommendations that should be considered during assembly were presented.

scholarly journals Temperatura y concentración de fluoruro de sodio en geles fluorados

2019 ◽  
Vol 7 (01) ◽  
pp. 294-301
Author(s):  
Vianne Diana Huamán Baca ◽  
Alejandro pablo Pletickosich ◽  
Teófila Baca Carbajal
Keyword(s):  
Sodium Fluoride ◽  
Room Temperature ◽  
Acidic Ph ◽  
Influence Of Temperature ◽  
Neutral Ph ◽  
Influence Of Temperature On ◽  
Para Determinar

ResumenEl objetivo de esta investigación fue determinar la influencia de la temperatura en la concentración de fluoruro de sodio; la muestra estuvo conformada por 60 geles fluorados de un mismo lote y la validez de dos marcas: ‘Fluofar®’ en sus dos presentaciones (pH neutro y acidulado) y el ‘Fluorgel Maquira®’ en sus dos presentaciones (pH neutro y acidulado). De cada gel fluorado se obtuvieron cuatro muestras: para comprobar el pH, para determinar la concentración de fluoruro de sodio a temperatura ambiente, para fijar la concentración de fluoruro de sodio después de haber sido sometido a una temperatura de 8 °C durante tres meses, y para, determinar la concentración de fluoruro de sodio después de haber sido sometido a una temperatura de 20 °C durante tres meses.La determinación de concentración de fluoruro de sodio, se realizó mediante la técnica de destilación y titulación. Por los resultados obtenidos se concluyó: que el incremento de la temperatura influye en la disminución de la concentración de fluoruro de sodio —siendo estadísticamente significativa en los geles fluorados con pH ácido (geles acidulados) y, en los geles fluorados con pH neutro mantiene su concentración—, aún se incrementó la temperatura. La concentración de fluoruro de sodio, indicado por el fabricante, disminuyó significativamente al comparar con la concentración de fluoruro de sodio encontrado en el laboratorio.Palabras claves; Geles fluorados, concentración de fluoruro de sodio, temperatura, pHAbstractThe objective of this investigation was to determine the influence of temperature on the concentration of sodium fluoride; the sample consisted of 60 fluorinated gels from the same batch and validity of two brands: Fluofar ® in its two presentations (neutral and acidulated pH) and Fluorgel Maquira ® and its two presentations (neutral pH and acidulated). From each fluorinated gel four samples were obtained: to determine the pH, to determine the concentration of sodium fluoride at room temperature, to determine the concentration of sodium fluoride after having been subjected to temperature of 8 °C for three months, and to determine the concentration of sodium fluoride after having been subjected to temperature of 20 °C for three months.The determination of concentration of Sodium Fluoride was carried out by means of the distillation and titration. From the results obtained, it was concluded that the increase in temperature influences the decrease in the concentration of sodium fluoride -being statistically significant in fluorinated gels with acidic pH (acidified gels) and, in fluorinated gels with neutral pH, it maintains its concentration-, the temperature was still increased. The concentration of sodium fluoride, indicated by the manufacturer, decreased significantly when compared to the concentration of sodium fluoride found in the laboratory.

The Influence of Temperature on the Lateral Photovoltaic Effect in the Fe3O4/SiO2/n-Si Structure

2020 ◽  
Vol 312 ◽  
pp. 92-97
Author(s):  
Tatiana A. Pisarenko ◽  
Vladimir V. Korobtsov ◽  
Vyacheslav V. Balashev ◽  
Artem A. Dimitriev
Keyword(s):  
Energy Band ◽  
Temperature Effects ◽  
Photovoltaic Effect ◽  
Strong Dependence ◽  
Equivalent Circuits ◽  
Film Resistance ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Magnetite Film

We report on the results of a study of the lateral photovoltaic effect in the Fe3O4/SiO2/n-Si(001) structure at temperatures of 300 and 122 K under continuous and pulsed illumination. It is found that when the temperature changes from 300 to 122 K, the LPE sensitivity decreases from 112 to 65 mV/mm. At pulsed illumination, an increase of rise time and a fall time is observed with decreasing temperature. From a consideration of the energy band diagrams and equivalent circuits of the Fe3O4/SiO2/n-Si structure, it is assumed that the detected temperature effects of LPE are due to the strong dependence of the magnetite film resistance on temperature.

Influence of Temperature on the Electrochemical Characteristics of Ti-6Al-4V

2014 ◽  
Vol 811 ◽  
pp. 77-82
Author(s):  
Martina Ivašková ◽  
Martin Lovíšek ◽  
Peter Jančovič ◽  
Lenka Bukovinová
Keyword(s):  
Activation Energy ◽  
Polished Surface ◽  
Electrochemical Characteristics ◽  
Medical Implants ◽  
Influence Of Temperature ◽  
Arrhenius Relation ◽  
Military Aviation ◽  
Different Temperatures ◽  
Influence Of Temperature On

Titanium is not only the most widely used biomaterial for medical implants, but with its very good mechanical properties, corrosion resistance and low density is also applicated in many sectors of industry (aerospace, military, aviation, machinery, energetics, chemicals, etc.). In this paper it is described the influence of temperature on the electrochemical characteristics of Ti-6Al-4V alloy. The surface was mechanically grinded and polished by chemical-mechanical process. Basic electrochemical characteristics were determined by potentiodynamic tests in 0.1M NaCl solution at different temperatures. The obtained results were analysed by the Tafel-extrapolation method. Finally, a modified Arrhenius relation was used for determination of activation energy. The activation energy of grinded and chemical-mechanical polished surface is nearly three times higher than activation energy of only grinded surface.

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