The Relationship of a Gasket’s Physical Properties to the Sealing Phenomenon

1965 ◽  
Author(s):  
D. E. Czernik ◽  
J. C. Moerk ◽  
F. A. Robbins
Keyword(s):  
Physical Properties ◽  
Relationship Of ◽  
The Relationship

The Direct Determination of Oxygen in Rubber. The Adaptation of the Ter Meulen Method to Rubber and Its Application to the Study of Aging

1939 ◽  
Vol 12 (2) ◽  
pp. 269-282 ◽  
Author(s):  
H. I. Cramer ◽  
I. J. Sjothun ◽  
L. E. Oneacre
Keyword(s):  
Tensile Strength ◽  
Physical Properties ◽  
Direct Determination ◽  
Sulfur Poisoning ◽  
Oxidation Products ◽  
Oxygen Bomb ◽  
Vulcanized Rubber ◽  
Relationship Of ◽  
The Relationship

Abstract The ter Meulen method for the direct determination of oxygen has been adapted, with modifications, to the analysis of raw and vulcanized rubbers. Raney nickel has been found to be quite effective as the reducing catalyst and to be satisfactorily resistant to sulfur poisoning. The method has been applied to the study of the aging of vulcanized rubber in the Geer oven and oxygen bomb. From this study the following conclusions may be drawn: (1) The increase in combined oxygen is greater in the oxygen bomb than in the Geer oven. (2) Deterioration of rubber in the oxygen bomb involves oxidation primarily, whereas that occurring in the Geer oven involves not only oxidation but also thermal decomposition followed by volatilization of oxidation products. (3) The effectiveness of an antioxidant in retarding the absorption of oxygen in oxygen-bomb aging agrees well with its ability to maintain the physical properties of the stock in which it is present. (4) The deterioration in physical properties of a rubber stock in the oxygen bomb during the early stages of aging is a linear function of the increase in combined oxygen. For stocks containing antioxidants and diphenylguanidine as the accelerator, an increase in combined oxygen of approximately 1.2% corresponds to a decrease in tensile strength of 50%. (5) The relationship of increase in combined oxygen to decrease in tensile strength seems to be affected not only by antioxidants, but also by accelerators of vulcanization.

scholarly journals On the Relationship of Thermodynamic and Physical Properties of Polymers With Ice Adhesion

1985 ◽  
Vol 6 ◽  
pp. 146-149 ◽  
Author(s):  
H. Murase ◽  
K. Nanishi
Keyword(s):  
Physical Properties ◽  
Adhesive Strength ◽  
Polymer System ◽  
Work Of Adhesion ◽  
Polymer Composition ◽  
Coating Materials ◽  
The Difference ◽  
Relationship Of ◽  
The Relationship ◽  
Ice Adhesion

The purpose of this work is to study the relationship of energetic and physical properties of polymetric materials with ice adhesion, and to develop the material to prevent ice adhesion. From various parameters of water and ice, dispersion and hydrogen bond contribution of surface free energy of ice were calculated. Using these values and that of contact angle formed between Ice and polymer in the air and also in paraffin, work of adhesion W-πe and W were determined respectively. The difference W-(W-πe ) has made it possible to evaluate the effect of surface pressure n on ice adhesion. On the other hand, actual adhesive strength of ice was measured. Some correlations between theoretical and observed values were found. Further, visco-elastic properties of polymers below icing temperature and temperature dependence of strain in the ice/polymer system were investigated. The results showed some characteristics of polymers which are related to molecular mobility at lower temperature, are effective in reducing the adhesive strength to ice. Numerous attempts were made to develop coating materials to prevent ice adhesion. A composite polymer composition, which has peculiar ingredients and structure, was proposed and found to provide the ability for the lowest ice adhesion. Ice preventive mechanism of the film was discussed.

scholarly journals Hubungan Sifat Fisik Tanah dan Permeabilitas Tanah Pada Daerah Permukiman di Kecamatan Koto Tangah

CIVED ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 60
Author(s):  
Muhammad Ricky Luandra ◽  
Totoh Andayono
Keyword(s):  
Physical Properties ◽  
Quantitative Study ◽  
Negative Relationship ◽  
Secondary Data ◽  
Primary Data ◽  
Soil Density ◽  
Soil Permeability ◽  
Relationship Of ◽  
The Relationship ◽  
Soil Weight

Penelitian ini bertujuan untuk mengetahui hubungan antara sifat fisik tanah terhadap nilai permeabilitas tanah pada permukiman di Kecamatan Koto Tangah. Penelitian ini merupakan penelitian kuantitatif dengan pendekatan secara korelasioanal. Data yang digunakan berupa data primer yang didapatkan di lapangan serta di laboratorium dan data sekunder dedapatkan pada literatur atau arsip pemerintahan kemudian diolalah menggunakan QGIS. Data primer tersebut berupa kadar air tanah, berat jenis tanah, berat isi tanah, dan permeabilitas tanah, sedangkan data sekunder berupa denah lokasi penelitian. Didapatkan nilai signifikansi hubungan kadar air tanah dengan permeabilitas tanah sebesar 0,004 dan di peroleh R²sebesar 0,662 serta arah hubungan negatif, nilai signifikansi hubungan berat isi tanah dengan permeabilitas tanah sebesar 0,023 dan di peroleh R² sebesar 0,498 serta arah hubungannya negatif, sedangkan nilai signifikansi hubungan berat jenis tanah dengan permeabilitas sebesar 0,239. Sehingga dapat disimpulkan hubungan sifat fisik tanah dengan permeabilitas tanah mempunyai hubungan yang signifikan (berarti).This study aims to determine the relationship between the physical properties of the soil to the value of soil permeability in settlements in Koto Tangah District. This research is a quantitative study with a correlation approach. The data used are primary data obtained in the field as well as in the laboratory and secondary data obtained in literature or government archives which are then processed using QGIS. The primary data is in the form of soil water content, soil density, soil density, and soil permeability, while secondary data is in the form of a plan of the research location. The significance value of the relationship between groundwater content and soil permeability was 0.004 and obtained R² of 0.662 and the direction of the negative relationship, the significance value of the relationship between soil weight and soil permeability was 0.023 and obtained R² of 0.498 and the direction of the relationship was negative, while the significance value of the relationship of density soil with a permeability of 0.239. So it can be concluded that the relationship between the physical properties of the soil and the permeability of the soil have a significant relationship (meaning).

scholarly journals FCRAO CO Survey of the Outer Galaxy

1997 ◽  
Vol 170 ◽  
pp. 36-38
Author(s):  
Mark H. Heyer
Keyword(s):  
Interstellar Medium ◽  
Physical Properties ◽  
Hii Regions ◽  
First Year ◽  
Molecular Gas ◽  
Preliminary Results ◽  
Relationship Of ◽  
The Relationship ◽  
Gas Component ◽  
Spiral Arm

FCRAO has initiated an imaging survey of CO J=1–0 emission from the outer Galaxy to better understand the physical properties of the molecular gas component of the interstellar medium and to determine the relationship of this component to spiral arm features. When completed in Spring 1996, the CO Survey will cover 103° < lII < 145°, −3° < bII < 5°, and −150 < VLSR < 50 km s–1 with angular sampling of 50″ and velocity resolution of 0.8 km s–1. During the first year of observations, we have focused upon two fields with longitude ranges of 103° < lII < 112° and 131° < lII < 139°. The first field corresponds to the Cepheus region while the second field contains the W3, W4, and W5 complex of HII regions. To date, 700,000 CO spectra have been collected. In this contribution, we present preliminary results from the first year of observations.

scholarly journals Physical Properties of Red Cells as Related to Effects in Vivo. I. Increased Rigidity of Erythrocytes as Measured by Viscosity of Cells Altered by Chemical Fixation, Sickling and Hypertonicity

Blood ◽  
1968 ◽  
Vol 32 (6) ◽  
pp. 847-861 ◽  
Author(s):  
THOMAS HALE HAM ◽  
REBECCA F. DUNN ◽  
RICHARD W. SAYRE ◽  
JOHN R. MURPHY
Keyword(s):  
Sodium Chloride ◽  
Physical Properties ◽  
Normal Subjects ◽  
Cell Suspensions ◽  
Red Cells ◽  
Mechanical Trauma ◽  
Chemical Fixation ◽  
Relationship Of ◽  
The Relationship

Abstract Changes in the physical properties of red cells were produced by chemical fixation, the sickling process, by suspension in hypertonic sodium chloride and by a combination of hypertonicity and sickling. These resulted in a loss of deformability or increased rigidity of cells as indicated by a rise in viscosity of cell suspensions and hemolysates, more Newtonian flow, diminished filtration of cell suspensions through microfilters, resistance to packing by centrifugal force and abnormal susceptibility to mechanical trauma. The results of these studies show that in hypertonic sodium chloride all cells have an increased viscosity and are more rigid. The relationship of these physical properties to the behavior of cells in the microcirculation is discussed for normal subjects and those with sickle cell disease, including the effect on the kidney.

The Relationship of Physical Properties to Market Acceptability of Crisphead Lettuce

1972 ◽  
Vol 15 (2) ◽  
pp. 0358-0360 ◽  
Author(s):  
W. B. Goddard ◽  
M. Zahara ◽  
P. A. Adrian and D. H. Lenker
Keyword(s):  
Physical Properties ◽  
Relationship Of ◽  
The Relationship

scholarly journals On the Relationship of Thermodynamic and Physical Properties of Polymers With Ice Adhesion

1985 ◽  
Vol 6 ◽  
pp. 146-149 ◽  
Author(s):  
H. Murase ◽  
K. Nanishi
Keyword(s):  
Physical Properties ◽  
Adhesive Strength ◽  
Polymer System ◽  
Work Of Adhesion ◽  
Polymer Composition ◽  
Coating Materials ◽  
The Difference ◽  
Relationship Of ◽  
The Relationship ◽  
Ice Adhesion

The purpose of this work is to study the relationship of energetic and physical properties of polymetric materials with ice adhesion, and to develop the material to prevent ice adhesion. From various parameters of water and ice, dispersion and hydrogen bond contribution of surface free energy of ice were calculated. Using these values and that of contact angle formed between Ice and polymer in the air and also in paraffin, work of adhesion W-πe and W were determined respectively. The difference W-(W-πe) has made it possible to evaluate the effect of surface pressure n on ice adhesion. On the other hand, actual adhesive strength of ice was measured. Some correlations between theoretical and observed values were found. Further, visco-elastic properties of polymers below icing temperature and temperature dependence of strain in the ice/polymer system were investigated. The results showed some characteristics of polymers which are related to molecular mobility at lower temperature, are effective in reducing the adhesive strength to ice.Numerous attempts were made to develop coating materials to prevent ice adhesion. A composite polymer composition, which has peculiar ingredients and structure, was proposed and found to provide the ability for the lowest ice adhesion. Ice preventive mechanism of the film was discussed.

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