scholarly journals Intrinsic mechanical properties of the perfused armoured catfish heart with special reference to the effects of hypercapnic acidosis on maximum cardiac performance

2009 ◽  
Vol 212 (9) ◽  
pp. 1270-1276 ◽  
Author(s):  
L. M. Hanson ◽  
D. W. Baker ◽  
L. J. Kuchel ◽  
A. P. Farrell ◽  
A. L. Val ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Special Reference ◽  
Cardiac Performance ◽  
Hypercapnic Acidosis ◽  
Armoured Catfish

scholarly journals Chemical reactions during sintering of Fe-Cr-Mn-Si-Ni-Mo-C-steels with special reference to processing in semi-closed containers

2015 ◽  
Vol 47 (1) ◽  
pp. 61-69 ◽  
Author(s):  
A. Cias
Keyword(s):  
Mechanical Properties ◽  
Carbon Monoxide ◽  
Special Reference ◽  
Water Vapour ◽  
Chemical Reactions ◽  
Thermodynamic Data ◽  
Alloying Elements ◽  
Bearing Steels ◽  
Kinetics Of

Sintering of Cr, Mn and Si bearing steels has recently attracted both experimental and theoretical attention and processing in semiclosed containers has been reproposed. This paper brings together relevant thermodynamic data and considers the kinetics of some relevant chemical reactions. These involve iron and carbon, water vapour, carbon monoxide and dioxide, hydrogen and nitrogen of the sintering atmospheres and the alloying elements Cr, Mn, Mo and Si. The paper concludes by presenting mechanical properties data for three steels sintered in local microatmosphere with nitrogen, hydrogen, nitrogen-5% hydrogen and air as the furnace gas.

Elastomer Blends

2002 ◽  
Vol 75 (3) ◽  
pp. 365-427 ◽  
Author(s):  
Duryodhan Mangaraj
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Special Reference ◽  
Transport Properties ◽  
Commercial Application ◽  
Solution Properties ◽  
Polymer Miscibility ◽  
Mechanical Methods

Abstract Blending of elastomers is often used to enhance he performance characteristics of rubber products. This article reviews the thermodynamic principles underlying polymer-polymer miscibility, with special reference to elastomer blends. It discusses the distribution of fillers, additives and curatives in different phases of the blend and its effect on the properties of the vulcanizate. It describes the different methods used in preparing elastomer blends, with special emphasis on compatibilization. Characterization of blends using optical and electron microscopy, solution properties, thermal and dynamic mechanical methods have been described along with results. The effect of blending on mechanical properties, hysteresis, adhesion and tack, transport properties and electrical conductivity has been discussed. Past attempts for property enhancement by blending elastomers have been reviewed, followed by a discussion of commercial application of elastomer blends.

scholarly journals Roles of silica and lignin in horsetail (Equisetum hyemale), with special reference to mechanical properties

2012 ◽  
Vol 111 (4) ◽  
pp. 044703 ◽  
Author(s):  
Shigeru Yamanaka ◽  
Kanna Sato ◽  
Fuyu Ito ◽  
Satoshi Komatsubara ◽  
Hiroshi Ohata ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Special Reference ◽  
Equisetum Hyemale

The Repair of Worn or Over-machined Parts by Electrodeposition

1945 ◽  
Vol 152 (1) ◽  
pp. 8-28 ◽  
Author(s):  
A. W. Hothersall
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fatigue Strength ◽  
Special Reference ◽  
Nickel Coatings ◽  
Electrodeposited Coatings ◽  
Machined Parts ◽  
Electrodeposition Of Nickel

Worn or over-machined parts may be restored to size by electrodeposition of nickel or chromium followed by machining or grinding to remove excess of deposit. The mechanical properties and the adhesion of these deposits are described with special reference to nickel. It is shown that strongly adherent nickel coatings can contribute appreciably to the tensile strength of the steel upon which they are deposited. Electrodeposited coatings may reduce the fatigue strength of steel and their use on parts subject to high alternating stresses should be made with caution. General notes on the process are given for the guidance of users.

scholarly journals Intrinsic mechanical properties of the perfused rainbow trout heart and the effects of catecholamines and extracellular calcium under control and acidotic conditions

1986 ◽  
Vol 125 (1) ◽  
pp. 319-345 ◽  
Author(s):  
A. P. Farrell ◽  
K. R. MacLeod ◽  
B. Chancey
Keyword(s):  
Mechanical Properties ◽  
Heart Rate ◽  
Rainbow Trout ◽  
Cardiac Contractility ◽  
Cardiac Performance ◽  
Extracellular Calcium ◽  
Modest Improvement ◽  
Positive Inotropy ◽  
Inotropic State ◽  
Extracellular Acidosis

A perfused rainbow trout heart was developed which generated its own intrinsic heart rate and a physiological power output. This preparation was used to examine the intrinsic mechanical properties of the trout heart, the dose-response effects of catecholamines and extracellular calcium on these properties, and the effects of catecholamines and extracellular calcium during exposure to acidotic conditions. The trout heart was relatively pressure-insensitive to a physiological range of ventral aortic pressures. Preload exerted an important control over cardiac output through the Starling response. Heart rate was independent of both these intrinsic mechanisms. The intrinsic mechanical capabilities of the trout heart were greater than those observed previously in less active, benthic teleosts. Physiological concentrations of catecholamines significantly improved cardiac contractility through positive inotropy and chronotropy. Adrenaline was more potent than noradrenaline, indicating that these effects were mediated by beta 2-adrenoceptors. Elevated extracellular calcium produced only a modest improvement of cardiac contractility compared to that produced by adrenaline. Positive inotropy and negative chronotropy were observed with elevated extracellular calcium. Extracellular acidosis always reduced cardiac contractility through negative chronotropy and inotropy. Extracellular calcium improved the inotropic state of the acidotic heart and restored contractility, but the overall improvement of cardiac performance was compromised by an accompanying negative chronotropy. Physiological levels of adrenaline improved cardiac performance during extracellular acidosis. The roles of catecholamines and extracellular calcium are discussed with respect to post-exercise cardiac performance in trout.

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