scholarly journals THE AUTOMOBILE TIRES VULCANIZATION METHOD REPAIR PROCESS EXPERIMENTAL INVESTIGATION

2018 ◽  
Vol 1 (50) ◽  
pp. 56-61
Author(s):  
O. V. Orysenko ◽  
A. I. Kryvorot ◽  
V. V. Ilchenko ◽  
H. А. Filipova
Keyword(s):  
Experimental Data ◽  
Mechanical Damage ◽  
Repair Process ◽  
Heating Element ◽  
Degree Polynomial ◽  
Significant Discrepancy ◽  
Temperature And Pressure ◽  
Welding Surface ◽  
Positive Results ◽  
Automobile Tires

In the article local repair automobile tires expediency by vulcanization means in mechanical damage carcass case is shown. It has been established that analytical and experimental data on determining the required temperature of the heating element have a significant discrepancy. It was found that on the vulcanization degree among all factors temperature and pressure on the welding surfaces are the most influential. After processing the experimental data and using the static methods, mathematical dependence of the temperature on the welding surface from the heating element temperature and on the welding surfaces as a second-degree polynomial is obtained. In order to verify the research results reliability, the control welding of the automobile tires with cord lateral rupture was conducted, which gave positive results.

scholarly journals Elastic, Mechanical, and Phonon Behavior of Orpiment Arsenic Trisulfide under Pressure

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Liwu Jiang ◽  
Meiling Wu ◽  
Peng Shi ◽  
Chuanhui Zhang
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Force Field ◽  
Elastic Constants ◽  
Phonon Dispersion ◽  
Geometry Optimization ◽  
Elastic Parameters ◽  
Arsenic Trisulfide ◽  
High Temperature And Pressure ◽  
Temperature And Pressure

Arsenic trisulfide (As2S3) has been found to be an excellent glass former at high temperature and pressure. However, there is still some scarcity for the elastic and phonon behavior of the orpiment phase. By using the Dreiding force field of the geometry optimization computations, we investigated the elastic constants, mechanical moduli, and the phonon dispersion of orpiment As2S3 under the pressure from 0 to 5 GPa. Some results of the elastic parameters of orpiment-As2S3 at 0 GPa are consistent with the experimental data. The phonon dispersions for orpiment As2S3 under pressure are also reasonable with previous calculations.

scholarly journals A critical statistical study of experimental data on the effect of minute electric currents on the growth rate of the coleoptile of barley

1926 ◽  
Vol 99 (695) ◽  
pp. 122-130 ◽  
Keyword(s):  
Experimental Data ◽  
Growth Rate ◽  
Statistical Study ◽  
Pure Line ◽  
Similar Data ◽  
Electric Currents ◽  
Rate Of Growth ◽  
The Mean ◽  
Positive Results ◽  
Case Based

A study of the effect of very minute electric currents on the rate of growth of the coleoptile of barley was published recently by one of us (F. G. G.) in collaboration. In this paper the mean rate of a number of control coleoptiles was compared with the mean rate of a number exposed to a minute electric discharge. The growth rate of individual coleoptiles showed, naturally, considerable divergences, so the mean result was in each case based on the observation of a large number of coleoptiles, the increments of growth of individual coleoptiles being stated as percentages of the rate of growth during the first hour of observation. It was assumed that the distribution of growth rates in a comparatively large sample of a pure-line barley would conform with the normal distribution; the probable errors of the mean results were therefore calculated in the ordinary way. During the continuation of this work positive results have been obtained in further experimental sets, but a number of these, though significant in the mass, were individually without significance. This suggested that a careful statistical study of the data on which the results were based might show how the accuracy of the method could be increased. Such a study has accordingly been undertaken, and it seems probable that methods employed are likely to be of use in the treatment of similar data.

First-Principles Calculations of Elastic and Thermodynamic Properties of Cubic CdTe

2011 ◽  
Vol 268-270 ◽  
pp. 886-891
Author(s):  
Ben Hai Yu ◽  
Dong Chen
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Bulk Modulus ◽  
First Principles ◽  
Debye Model ◽  
First Principles Calculations ◽  
Lattice Constants ◽  
Temperature And Pressure ◽  
The Relationship

the equilibrium lattice constants, elastic and thermodynamic properties of cubic CdTe are systemically investigated at high temperature using the plane-wave pseudopotential method as well as the quasi-harmonic Debye model. The bulk modulus of CdTe are calculated as a function of temperature up to 1000K, the relationship between bulk modulusBand pressure is also obtained. The results gained from this model will provide overall predictions accurately for the temperature and pressure dependence of various quantities such as the bulk modulus, the heat capacity and the thermal expansion coefficient. More over, the dependences between Debye temperature and temperature are also successfully obtained. Our results are compared with the experimental data and discussed in light of previous works.

A mathematical model for the freezing process in biological tissue

1988 ◽  
Vol 234 (1276) ◽  
pp. 343-358 ◽  
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Blood Vessel ◽  
Vascular System ◽  
Mechanical Damage ◽  
Thermal Conditions ◽  
Damage Mechanism ◽  
Freezing Process ◽  
Unit Structure ◽  
Krogh Cylinder

A mathematical model has been developed to study the process of freezing in biological organs. The model consists of a repetitive unit structure comprising a cylinder of tissue with an axial blood vessel (Krogh cylinder) and it is analysed by the methods of irreversible thermo­dynamics. The mathematical simulation of the freezing process in liver tissue compares remarkably well with experimental data on the structure of tissue frozen under controlled thermal conditions and the response of liver cells to changes in cooling rate. The study also supports the proposal that the damage mechanism responsible for the lack of success in attempts to preserve tissue in a frozen state, under conditions in which cells in suspension survive freezing, is direct mechanical damage caused by the formation of ice in the vascular system.

scholarly journals To the determination of non-washable speed in the channels bed consisting of disconnected soils

2021 ◽  
Vol 264 ◽  
pp. 03011
Author(s):  
Luqmon Samiev ◽  
Qudratjon Rakhimov ◽  
Zaytuna Ibragimova ◽  
Davron Allayorov
Keyword(s):  
Experimental Data ◽  
Velocity Distribution ◽  
Deformation Process ◽  
Laboratory Studies ◽  
Trapezoidal Shape ◽  
Sand Particles ◽  
Different Diameters ◽  
Experimental Researches ◽  
Positive Results

This article analyzes the factors that influence the deformation process in the channel. When assessing the deformation process in channels consisting of disconnected soils, the method for determining nonwashable speed was analyzed, taking into account the trapezoidal shape of the channel, and, based on laboratory studies, a dependence was proposed for determining the non-washable speed. The values of the proposed dependencies are compared with the calculated values of the formulas of I.I. Levi, C.E. Mirtskhulava, V.A. Velikanova, B.I. Studenichnikov and A.M. Latyshenkov and obtained positive results. The proposed dependencies for the determination of non-washable speed are improved, taking into account turbulence and the laws of velocity distribution over the stream's depth. In the experimental researches, were used sand particles with different diameters d ≤ 0.315mm; 0.315mm < d ≤ 0.63mm; 0.63mm < d ≤1.25mm 1.25mm < d ≤ 2.5mm 2.5mm < d ≤ 5.0mm. Based on the analysis of the experimental data, the coefficients are as follows: η1 = 1.41 for the bottom of the channel and η2 = 1.52 for side slopes. The reliability of the results is justified by comparing the proposed calculation method with a study of other authors. Based on the research, constructed a plot of the velocity distribution and the depth of the stream. In these diagrams, preservation of the change in velocity along the depth of the flow was observed under various modes of motion. In all experiments, a process was observed-the smallest value of the flow velocity at the bottom and the highest at a depth of (0.8–0.9) h from the water level.

Aquathermolysis of Heavy Oil Model Compounds

2011 ◽  
Vol 236-238 ◽  
pp. 732-735 ◽  
Author(s):  
Chun Tian Liu
Keyword(s):  
Experimental Data ◽  
Heavy Oil ◽  
Equilibrium Composition ◽  
Feed Ratio ◽  
Model Compounds ◽  
Gaseous Products ◽  
High Feed ◽  
Sulfide Compound ◽  
Temperature And Pressure ◽  
Increasing Temperature

Tetrahydrothiophene and thiophene are taken as models of aliphatic and aromatic sulfides in aquathermolysis reaction of heavy oil respectively. Experimental data indicates C-S bond of sulfide compound are broken down. The results of thermodynamic calculation indicate that transform rates of two reactants arrive at 100% when the ratio of water/tetrahydrothiophene is more than 3 or the ratio of water/thiophene is more than 4 respectively, temperature and pressure and feed ratio have little effects on equilibrium composition simultaneously. High feed-in ratio is propitious to yield when water is insufficient, and the gaseous products improve with increasing temperature and decreasing pressure.

Equation of Equilibrium Moisture Content of Wood under Vacuum by Regression Analysis

2010 ◽  
Vol 139-141 ◽  
pp. 645-648
Author(s):  
Song Lin Yi ◽  
Yong Dong Zhou ◽  
Zheng Bin He ◽  
Xiao Jiang Feng ◽  
Bi Guang Zhang
Keyword(s):  
Experimental Data ◽  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Pressure Range ◽  
Solid Wood ◽  
Chinese Fir ◽  
Regression Equation ◽  
Drying Method ◽  
Temperature And Pressure ◽  
Highly Correlated

Relationship among equilibrium moisture content (EMC), temperature and pressure was established under vacuum condition, and EMC regression equation was constructed based on experimental data, with Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) as Experimental material, and MC was measured by oven-drying method. The experimental temperature range was from 40 to 90°C at the interval of 10°C, and pressure range was from 0.02 to 0.08 MPa at the interval of 0.02 MPa. EMC Comparison of Chinese fir and paper wafer sensor showed: EMC of paper wafer sensor changed in the same trend of solid wood. A regression equation was presented and the calculated EMC value was highly correlated with experimental data. This regression equation can be used to predict EMC under vacuum, especially for automatic control system of wood drying under vacuum.

The Behavior of H2 in Aqueous Fluids under High Temperature and Pressure

Elements ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 33-38 ◽  
Author(s):  
Elena F. Bazarkina ◽  
I-Ming Chou ◽  
Alexander F. Goncharov ◽  
Nikolay N. Akinfiev
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Critical Point ◽  
Hydrothermal Systems ◽  
Extreme Temperatures ◽  
Aqueous Systems ◽  
Hydrothermal Conditions ◽  
Planetary Interiors ◽  
High Temperature And Pressure ◽  
Temperature And Pressure

The presence of H2 and H2O in planetary interiors prompts the need for fundamental studies on these compounds under corresponding conditions. Here, we summarize data on H2 properties in aqueous systems under conditions of high temperature and pressure. We explain how to measure important H2 fugacities in hydrothermal systems. We present available experimental data and thermodynamic models for H2 solubility and vapor–liquid partitioning under hydrothermal conditions. In addition, we introduce the fascinating world of H2–H2O clathrate hydrates under extreme temperatures and pressures. The properties of the H2–H2O system are well established below the critical point of water (374 °C and 22.06 MPa), but far less is known under higher temperatures and pressures, or the effect of salt.

Mathematical Modeling and Investigation on the Temperature and Pressure Dependency of Permeation and Membrane Separation Performance for Natural gas Treatment

2016 ◽  
Vol 11 (1) ◽  
pp. 7-10 ◽  
Author(s):  
Seyed Saeid Hosseini ◽  
Javad Aminian Dehkordi ◽  
Prodip K. Kundu
Keyword(s):  
Experimental Data ◽  
Pressure Dependence ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Effect Of Temperature ◽  
Separation Performance ◽  
Gas Treatment ◽  
Pressure Dependency ◽  
Temperature And Pressure ◽  
Membrane Permeance

Abstract Due to special features, modules comprising asymmetric hollow fiber membranes are widely used in various industrial gas separation processes. Accordingly, numerous mathematical models have been proposed for predicting and analyzing the performance. However, majority of the proposed models for this purpose assume that membrane permeance remains constant upon changes in temperature and pressure. In this study, a mathematical model is proposed by taking into account non-ideal effects including changes in pressure and temperature in both sides of hollow fibers, concentration polarization and Joule-Thomson effects. Finite element method is employed to solve the governing equations and model is validated using experimental data. The effect of temperature and pressure dependency of permeance and separation performance of hollow fiber membrane modules is investigated in the case of CO2/CH4. The effect of temperature and pressure dependence of membrane permeance is studied by using type Arrhenius type and partial immobilization equations to understand which form of the equations fits experimental data best. Findings reveal that the prediction of membrane performance for CO2/CH4 separation is highly related to pressure and temperature; the models considering temperature and pressure dependence of membrane permeance match experimental data with higher accuracy. Also, results suggest that partial immobilization model represents a better prediction to the experimental data than Arrhenius type equation.

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