Determination of quasistationary material surface destruction rate from linear entrainment measurements in the nonstationary regime

1992 ◽  
Vol 62 (4) ◽  
pp. 396-399
Author(s):  
G. A. Frolov ◽  
A. V. Bondarenko ◽  
V. V. Pasichnyi ◽  
N. E. Aleksandrova
Keyword(s):  
Material Surface ◽  
Destruction Rate ◽  
Nonstationary Regime ◽  
Surface Destruction

Statistical determination of red cell adhesion to material surface, by varying shear force

1985 ◽  
Vol 107 (1) ◽  
pp. 194-198 ◽  
Author(s):  
Takeshi Shiga ◽  
Misuzu Sekiya ◽  
Nobuji Maeda ◽  
Syoten Oka
Keyword(s):  
Cell Adhesion ◽  
Shear Force ◽  
Material Surface ◽  
Red Cell ◽  
Statistical Determination

Filtered thermal contrast based technique for testing of material by infrared thermography

2011 ◽  
Vol 19 (2) ◽  
Author(s):  
S. Gryś
Keyword(s):  
Heat Transfer ◽  
Infrared Camera ◽  
Thermal Parameters ◽  
Material Surface ◽  
Thermal Contrast ◽  
Material Defects ◽  
Propagation Of Uncertainty ◽  
Step Heating ◽  
1D Model

AbstractA new kind of thermal contrast, called “filtered contrast” is presented, which allows detecting and characterizing material defects using active thermography under some assumptions on physical and thermal parameters of materials. In opposition to known definitions of the thermal contrast, knowledge about defect-free area is not necessary and this contrast is less sensitive to nonuniformity of heat disposal to the material surface. The measurements were performed on an experimental setup equipped with a ThermaCAM PM 595 infrared camera and frame grabber. The step heating was chosen as heat excitation. The results demonstrate usefulness of the 1D model of heat transfer used for determination of depth of subsurface defects. The influence of the parameter of the smoothing filter, required for filtered contrast implementation, thermal parameters of the tested material and defect on expanded uncertainty of determination of defect depth is also presented. Due to significant complexity of the model of heat transfer, the conditions for the “law of propagation of uncertainty” were not fulfilled and a numerical method, i.e., Monte Carlo simulation is applied for the propagation of distributions.

ASSESSMENT OF PULSE ELECTRIC DISCHARGE ON THE PROCESS OF TRANSFER OF SUBSTANCE IN PLANT MATERIAL

2019 ◽  
Author(s):  
И.А. ШОРСТКИЙ ◽  
Д.А. ХУДЯКОВ
Keyword(s):  
Electric Discharge ◽  
Plant Material ◽  
Point Of View ◽  
Material Surface ◽  
Initial Moment ◽  
Intracellular Fluid ◽  
Pulse Electric ◽  
The Relationship ◽  
Pulse Electric Discharge

Проведена оценка выхода внутриклеточной жидкости из модифицированного импульсным электрическим разрядом растительного материала в начальный момент времени. Прослежена связь геометрических параметров, сформированных электрическим разрядом каналов, и внутриклеточного давления, играющих важную роль с точки зрения экспериментального определения количества выходящей внутриклеточной жидкости. Установлено, что количество жидкости на поверхности материала в диапазоне количества каналов 0 < n < 1500 имеет линейную зависимость. An assessment of the release of intracellular fluid from a plant material modified by a pulsed electrical discharge at the initial moment of time was made. The relationship between the geometric parameters of the channels formed by the electric discharge and the intracellular pressure, which play an important role from the point of view of experimental determination of the amount of intracellular fluid leaving, is traced. It is established that the amount of liquid on the material surface in the range of the number of channels 0 < n < 1500 has a linear relationship.

scholarly journals Fatigue limit estimation using IR camera

2018 ◽  
Vol 157 ◽  
pp. 05021 ◽  
Author(s):  
Zuzana Stankovičová ◽  
Vladimír Dekýš ◽  
Milan Uhríčik ◽  
Pavol Novák ◽  
Bohumír Strnadel
Keyword(s):  
Cyclic Loading ◽  
Fatigue Limit ◽  
Infrared Thermography ◽  
Traditional Method ◽  
Dynamic Behaviour ◽  
Material Surface ◽  
Test Results ◽  
Ir Camera ◽  
Short Time

Determination of fatigue limit by traditional method is associated with testing of large number of specimens. This is caused by more scatter in test results and therefore a higher amount of tests are needed to generate a statistically reliable trend. The paper presents rapid and reliable estimation of fatigue limit using infrared thermography. By analysing the temperature of the material surface during cyclic loading it is possible to evaluate the dynamic behaviour of a structure and determine the fatigue limit. The method provides reliable results using a very little number of specimens in a very short time compared with traditional method.

Determination of hydrophobic degree of paper packaging materials by a tracer-assisted headspace gas chromatography

2020 ◽  
Vol 35 (3) ◽  
pp. 370-375
Author(s):  
Yi Dai ◽  
Zhen-Hua Yu ◽  
Hao Wang ◽  
Jian-Bo Zhan ◽  
Jiao Xie ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Present Method ◽  
Water Drop ◽  
Packaging Material ◽  
Material Surface ◽  
Good Precision ◽  
Headspace Gas Chromatography ◽  
Excess Water ◽  
Headspace Gas

AbstractThe present work reports on a method for the determination of hydrophobic degree of paper packaging material by tracer-assisted headspace gas chromatography. The method was based on adding 40 μL of methanol-water drop on the paper surface for 20 s. After removing the excess water by turning the sample vertically, the sample is placed in a vial and the amount of residual tracer attached on the material surface was accurately quantified by full evaporation headspace gas chromatography. The results show that the present method has a good precision (less than 4.1 %). The present method is simple and accurate and it can be an efficient tool for testing the hydrophobic degree of paper packaging material in batch.

scholarly journals Mathematical Model of Friction Coefficient Determination for Lubricated Surfaces

2015 ◽  
Vol 1 ◽  
pp. 121
Author(s):  
Armands Leitans ◽  
Janis Lungevics
Keyword(s):  
Mathematical Model ◽  
Friction Coefficient ◽  
Sliding Friction ◽  
Material Surface ◽  
Roughness Parameters ◽  
Lubricating Material ◽  
Model Of Friction ◽  
Rough Surface Contact ◽  
Ball On Disc

<p class="R-AbstractKeywords"><em><span lang="EN-GB">This article reviews mathematical model for the determination of friction coefficient for lubricated surfaces which operate works at sliding friction pairs in boundary lubrication case. In the particular model an absolutely smooth ball and rough surface contact is viewed taking into account properties of the material, surface roughness parameters, lubricating material kinematic viscosity and density. The model refers to widely spread ball-on-disc type tribometer where ball is in the contacts with plane.</span></em></p>

scholarly journals Determination of Melting Unit Productivity in Synthetic Fibrous Materials Production by Vertical Blowing Method

2018 ◽  
Vol 21 (4) ◽  
pp. 136-140
Author(s):  
Vladislav Sviatskii ◽  
Pavol Božek ◽  
Mikhail Sokolov
Keyword(s):  
High Performance ◽  
Pressure Change ◽  
Fibre Production ◽  
Material Surface ◽  
Fibrous Materials ◽  
Molten Material ◽  
Operating Modes ◽  
Technology Of Production ◽  
Process Productivity

Abstract This paper presents the technology of production of synthetic fibrous materials from PET-raw by vertical blowing method. Fibre production by vertical blowing method is accompanied by complex and specific phenomena; therefore, development of new progressive technologies, high-performance machines and units for producing such materials is impossible without process modelling, which can significantly reduce the number of natural tests, cost and designing time and select optimal operating modes. Molten material motion in the melting unit of the hydrostatic type is determined by means of Poiseuille formula. Furthermore, the paper has proven that the melting unit has the greatest impact on process productivity by means of outlet radius and the pressure change of compressed air acting on the molten material surface. Increase in the height of the molten material column in the main cylindrical chamber of melting unit also leads to an increase in process productivity.

scholarly journals Presentation of a New Method for Determination of Diffusion Coefficients of Gaseous Pollutants in Cladding Wall Materials Indoors

2010 ◽  
Vol 297-301 ◽  
pp. 881-886 ◽  
Author(s):  
José J. Gonçalves ◽  
Armando S. Santos ◽  
Gabriela V. Silva ◽  
Eduardo O. Fernandes
Keyword(s):  
Building Materials ◽  
New Method ◽  
Material Surface ◽  
Indoor Environments ◽  
Gypsum Board ◽  
Sources And Sinks ◽  
Compound Material ◽  
Order Of Magnitude

Diffusion and partition coefficients are two key parameters of importance for the characterization of building materials as sources and sinks of air pollutants indoors. The number of coefficients for each pair ‘chemical compound – material surface’ available in the literature are still scarce and with a high discrepancy in the results obtained by different methods, even for the same method [1]. The objectives of this study were (1) to develop a simple and rapid experimental method for directly measuring the diffusion coefficient (D), and (2) to perform determinations with both the new and the cup method comparing the results obtained. The new method is based on two existent methodologies, the passive sampling on Tenax TA and the dry cup method, proposed by Haghighat et al. [1] and also developed by this research team [2]. The experiments were carried for three different building materials (cork based material, gypsum board and PVC) and three different compounds (cyclohexane, n-octane and m-xylene). The discussion of the results obtained for D by the two methods is presented in this paper. Observed differences were not of the same order of magnitude for the pairs compound/material studied, varying from the order of 101 in the case of PVC to 102 in the gypsum and in the cork. However some facts were the same: the gypsum board presents the higher values of D and PVC the lower values of D for the three compounds studied in both methods. One of the causes of these marked differences could be high difference of the concentration of the compound in the air between the methods, saturation value in cup method (dozens g/m3) and low values typical from indoor environments (few mg/m3) in the proposed method.

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