scholarly journals THE EFFECT OF TEMPERATURE ON THE MECHANICAL PROPERTIES AND ACTION POTENTIAL OF ISOLATED FROG VENTRICLE

1964 ◽  
Vol 14 (4) ◽  
pp. 422-438 ◽  
Author(s):  
Hidenobu MASHIMA ◽  
Moto MATSUMURA
Keyword(s):  
Mechanical Properties ◽  
Action Potential ◽  
Effect Of Temperature ◽  
Frog Ventricle

Effects of Anions on Frog Ventricle

1973 ◽  
Vol 51 (10) ◽  
pp. 709-726 ◽  
Author(s):  
Esther R. Anderson ◽  
J. G. Foulks
Keyword(s):  
Mechanical Properties ◽  
Action Potential ◽  
Time Course ◽  
Frog Heart ◽  
Resting Membrane Potential ◽  
Tension Development ◽  
Action Potential Prolongation ◽  
Frog Ventricle ◽  
Slow Onset ◽  
Contractile Performance

The effects of replacement of external chloride by other anions on the electrical and mechanical properties of frog ventricular muscle have been studied.The effects of methylsulfate were similar to those expected for replacement of a permeant anion with an impermeant anion. Increased twitch tension was largely dependent on action potential prolongation. Other anions of the sulfate–sulfonate series produced similar changes, but minor differences in their actions indicated that their effects could not be explained entirely by the elimination of chloride current.Acetate and its analogues produced dramatic changes in both the electrical and mechanical properties of frog heart. All caused a marked hyperpolarization of the resting membrane potential, accompanied by characteristic changes in the shape and duration of the repolarization phase of the action potential. Enhanced contractile performance was characterized by an increased rate of tension development and a slow onset of relaxation. These effects were equally prominent upon transfer to acetate Ringer's solution after previous equilibration to a medium containing methylsulfate in place of chloride. Although similar qualitatively, the members of this series of anions also displayed marked quantitative differences in the intensity and time course of their effects.

Effect of nickel on formation of transition layer during liquid-phase aluminizing of titanium

2020 ◽  
pp. 313-317
Author(s):  
A.I. Kovtunov ◽  
Yu.Yu. Khokhlov ◽  
S.V. Myamin
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Intermetallic Layer ◽  
Reaction Diffusion ◽  
Strength Properties ◽  
Effect Of Temperature ◽  
Nickel Concentration ◽  
Aluminum Melt ◽  
Titanium Aluminum ◽  
Titanium Foam

Titanium—aluminum, titanium—foam aluminum composites and bimetals obtained by liquid-phase methods, are increasingly used in industry. At the liquid-phase methods as result of the reaction diffusion of titanium and aluminum is formed transitional intermetallic layer at the phase boundary of the composite, which reduces the mechanical properties of titanium and composite. To reduce the growth rate of the intermetallic layer between the layers of the composite and increase its mechanical properties, it is proposed to alloy aluminum melt with nickel. The studies of the interaction of titanium and molten aluminum alloyed with nickel made it possible to establish the effect of temperature and aluminizing time on the thickness, chemical and phase compositions of the transition intermetallic layer. The tests showed the effect of the temperature of the aluminum melt, the nickel concentration on the strength properties of titanium—aluminum bimetal.

scholarly journals The effect of temperature and drawing ratio on the mechanical properties of polypropylene monofilaments

2014 ◽  
Author(s):  
Hesam Taheri ◽  
João Miguel Nóbrega ◽  
Pieter Samyn ◽  
José Antonio Covas
Keyword(s):  
Mechanical Properties ◽  
Effect Of Temperature ◽  
Drawing Ratio

Effect of Temperature on the Structure and Mechanical Properties of Mechanically Alloyed Al-Nio Composite

2014 ◽  
Vol 59 (1) ◽  
pp. 121-126
Author(s):  
M. Zygmunt-Kiper ◽  
L. Blaz ◽  
M. Sugamata
Keyword(s):  
Mechanical Properties ◽  
Aluminum Oxide ◽  
Aluminum Matrix ◽  
Hot Extrusion ◽  
Effect Of Temperature ◽  
Compression Tests ◽  
Mechanically Alloyed ◽  
Structure Morphology ◽  
High Purity Aluminum ◽  
Extrusion Method

Abstract Mechanical alloying of high-purity aluminum and 10 wt.% NiO powders combined with powder vacuum compression and following hot extrusion method was used to produce an Al-NiO composite. Mechanical properties of as-extruded materials as well as the samples annealed at 823 K /6 h, were tested by compression at 293 K - 770 K. High mechanical properties of the material were attributed to the highly refined structure of the samples. It was found that the structure morphology was practically not changed during hot-compression tests. Therefore, the effect of deformation temperature on the hardness of as-deformed samples was very limited. The annealing of samples at 823 K/6 h induced a chemical reaction between NiO-particles and surrounding aluminum matrix. As a result, the development of very fine aluminum oxide and Al3Ni grains was observed.

scholarly journals Effect Of Temperature On The Mechanical Properties Of Fibronectin

2009 ◽  
Vol 96 (3) ◽  
pp. 641a
Author(s):  
Isaac T.S. Li ◽  
Gilbert C. Walker
Keyword(s):  
Mechanical Properties ◽  
Effect Of Temperature

Investigating the Effect of Thermoelectric Processing on Ionic Aggregation in Thermoplastic Ionomers

2017 ◽  
Author(s):  
Prasant Vijayaraghavan ◽  
Vishnu-Baba Sundaresan
Keyword(s):  
Mechanical Properties ◽  
Electrostatic Field ◽  
Thermal Studies ◽  
Effect Of Temperature ◽  
Self Healing ◽  
Polymer Backbone ◽  
Ionic Dissociation ◽  
Dissociation Temperature ◽  
Aggregate Morphology ◽  
Poly Ethylene

Ionomers are a class of polymers which contain a small fraction of charged groups in the polymer backbone. These ionic groups aggregate (termed ionic aggregates) to form temporary cross-links that break apart over the ionic dissociation temperature and re-aggregate on cooling, influencing the mechanical properties of these polymers. In addition to enhanced mechanical properties, some ionomers also exhibit self-healing behavior. The self-healing behavior is a consequence of weakly bonded ionic aggregates breaking apart and re-aggregating after puncture or a ballistic impact. The structure and properties of ionomers have been studied over the last several decades; however, there is a lack of understanding of the influence of an electrostatic field on ionic aggregate morphology. Characterizing the effect of temperature and electric field on the formation and structure of these ionic aggregates will lead to preparation of ionomers with enhanced structural properties. This work focuses on Surlyn 8940 which a poly-ethylene methacryclic acid co-polymer in which a fraction of the carboxylic acid is terminated by sodium. In this work, Surlyn is thermoelectrically processed over its ionic dissociation temperature in the presence of a strong electrostatic field. Thermal studies are performed on the ionomer to study the effect of the thermoelectric processing. It is shown that the application of a thermoelectric field leads to increase in the ionic aggregate order in these materials and reduction in crystal size distribution. Thermal Analysis is performed using a Differential Scanning Calorimeter and the resulting thermogram analysis shows that thermoelectric processing increases the peak temperature and onset temperature of melting by 4 C and 20 C respectively. The peak width at half maximum of the melting endotherm is reduced by 10 C due to thermoelectric processing. This serves as a measure of the increased crystallinity. A parametric study on the effect of field duration and field strength is also performed.

The Effect of Deformation on Mechanical Properties and Shakedown on Railroad Wheels

2014 ◽  
Author(s):  
Steven L. Dedmon ◽  
Takashi Fujimura ◽  
Daniel Stone
Keyword(s):  
Mechanical Properties ◽  
Rolling Contact ◽  
Effect Of Temperature ◽  
Plastic Deformations ◽  
Rail Head ◽  
Class D ◽  
Shakedown Theory ◽  
Freight Car ◽  
Class C ◽  
Railroad Wheels

Plastic deformations alter the mechanical properties of many metals and alloys. Class C and Class D wheel steels such as are used in North American freight car service are particularly affected by plastic deformations occurring during rolling contact between the wheel tread and rail head. This investigation determines the effect plastic deformations have on the mechanical properties of Class C and D wheel steels and how those changes could relate to shakedown theory. The effect of temperature is also discussed.

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