Mathematical Processing and Structural Explanation of Surface Tension Polythermal Diagram Reached Out to Achieve Critical Temperature of Thermo-time Treatment for a Ni Based Superalloy

2019 ◽  
Vol 70 (6) ◽  
pp. 2232-2236
Author(s):  
Valeriu Rucai ◽  
Nicolae Constantin ◽  
Ion Ciuca ◽  
Brandusa Ghiban
Keyword(s):  
Surface Tension ◽  
Critical Temperature ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Cooling Process ◽  
Structural Explanation ◽  
Time Treatment ◽  
Mathematical Processing ◽  
Physical And Chemical ◽  
And Chemical Properties

Thermo-Time Treatment of multicomponent melting can be foreshadowed by the polythermal diagrams analysis of main physical and chemical properties, which are considered for this purpose as structural-sensitive properties: viscosity, surface tension, density or electrical conductivity [1]. Critical temperature (Tcr), i.e. temperature at which or around which, must run Thermo-Time Treatmenthas been experimentally marked by a sudden and seemingly contradictory deviation on polythermal diagrams of surface tension, s(T), reached out at cooling process for Ni base studied superalloy (MSRR 7045). A possible mathematical processing of it, is given by interpolation curves of the surface tensiondependence on temperature.

Investigations on condensation phenomena in mercury vapour

1934 ◽  
Vol 30 (2) ◽  
pp. 216-224
Author(s):  
P. C. Ho
Keyword(s):  
Surface Tension ◽  
Chemical Properties ◽  
Mercury Vapour ◽  
Physical And Chemical Properties ◽  
Critical Supersaturation ◽  
Different Temperatures ◽  
Image Position ◽  
Physical And Chemical ◽  
Theoretical Considerations ◽  
And Chemical Properties

Owing to its physical and chemical properties being greatly different from those of any of the liquids which have hitherto been used in the Wilson cloud chamber, mercury has been used in the experiments described in this paper and the condensation phenomena of its vapour at different temperatures observed. Before constructing the apparatus it was considered necessary to get from theoretical considerations some idea about the magnitude of the critical supersaturation for mercury vapour in equilibrium with a drop carrying unit charge. Assuming that J. J. Thomson's formula.where s is the supersaturation of mercury vapour in equilibrium with a drop of mercury of radius a, charge e, density σ and surface tension T, the value of which is assumed here to be independent of the radius of the drop, K the specific inductive capacity of the dielectric surrounding the drop, and R the gas constant for one gramme of weight, all at temperature θ, can be applied to the present problem, this critical supersaturation sm is given by the formula

Radiation Damage in Materials – Effects of Disorder

2009 ◽  
Vol 1193 ◽  
Author(s):  
Karl R. Whittle ◽  
Mark G. Blackford ◽  
Gregory R. Lumpkin ◽  
Katherine L. Smith ◽  
Nestor J. Zaluze
Keyword(s):  
Critical Temperature ◽  
Radiation Damage ◽  
Chemical Properties ◽  
Waste Form ◽  
Physical And Chemical Properties ◽  
Long Term Stability ◽  
Effects Of Disorder ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractRadiation damage and the effect on physical and chemical properties is an important component in the prediction of the long-term stability of waste form materials. As part of the ongoing goal of increasing the accuracy of long-term predictions of radiation damage, two types of material, based on proposed materials with a waste form application have been irradiated. Results have shown that Y2TiO5 (Y2.67Ti1.33O6.67), and Yb2TiO5 (Yb2.67Ti1.33O6.67), both of which are non-stoichiometric, disordered pyrochlore-based compounds, behave significantly different to the stoichiometric, ordered pyrochlore equivalent. For example the critical temperature, the temperature above which materials remain crystalline during irradiation, is found to decrease from the ordered equivalents, e.g. Y2Ti2O7. ⁡ A second material based on La2TiO5 has been found to behave differently to both La2/3TiO3 and La2Ti2O7, with a change in Tc of ∼ 200 K.

scholarly journals Evaluation of Physicochemical Properties and Chemical Constituents of Rasam, a Traditional South Indian Soup

2021 ◽  
pp. 18-25
Author(s):  
Ayush Sharma ◽  
Muthu Kumaradoss Mohan Maruga Raja ◽  
Ravi Manne
Keyword(s):  
Surface Tension ◽  
Refractive Index ◽  
Chemical Constituents ◽  
Control Measure ◽  
Chemical Properties ◽  
Physical Parameters ◽  
Physical And Chemical Properties ◽  
South Indian ◽  
Physical And Chemical ◽  
And Chemical Properties

Aims: To evaluate the physical and chemical properties of rasam, a traditional south Indian soup. Each ingredient present in rasam are known for their medicinal value individually. Moreover, rasam has being suggested as a general control measure in the treatment of SARS-CoV-2 by Ministry of AYUSH. For formulation designing the properties of material under study is generally determined. Hence, this study was carried out to evaluate the physiochemical properties of rasam so that it would be convenient to chose a suitable dosage form. Study Design: The physical and chemical studies was carried simultaneously in order to achieve the confirmatory results. Place and Duration of Study: Study was performed at Parul Institute of Pharmacy & Research, Parul University, Vadodara, Gujarat, India. The study took about 45 days. Methodology: The physical parameters evaluated were pH, viscosity, density, boiling range, surface tension, miscibility, refractive index and loss on drying. The chemical evaluation included preliminary qualitative phytochemical screening. Results: The pH of rasam was 3.916 ±0.0133, viscosity was 0.956 cp, density was 0.993 g/mL, relative density was 0.995, boiling point was 110.3333 ± 0.333, surface tension was 107.093 N/m, refractive index was 1.37, and loss on drying was 80%. It contains several chemical constituents like alkaloids, glycosides, saponins, etc. Conclusion: The evaluated physical and chemical properties of rasam would provide a gateway for the formulation researchers to follow-up with various dosage forms designing.

Studies on the Nature of the Action of Organic Accelerators for Rubber Vulcanization. VII. The Effect of Heat on the Surface Tension of Rubber Solutions

1935 ◽  
Vol 8 (1) ◽  
pp. 69-72
Author(s):  
Keiichi Shimada
Keyword(s):  
Surface Tension ◽  
Molecular Species ◽  
Present Author ◽  
Dynamic Equilibrium ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Dilute Solutions ◽  
Actual Concentration ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract In the previous paper on the effect of heat on the viscosity of rubber solutions (J. Rubber Soc., Japan,3, 413 (1931)), the present author suggested that the reduction in viscosity of dilute solutions of rubber on heating is probably a sign of depolymerization and not of physical disaggregation. In this report, the surface tension of rubber solutions has been investigated in an attempt to elucidate the effect of heat on rubber solutions and to draw some more definite conclusions. It should be possible, in the author's opinion, to detect depolymerization of rubber molecules by observing the surface tension variations of rubber solutions on heating, since the depolymerization of rubber would produce molecules differing widely in physical and chemical properties from the polymerized substance, and having most probably a different effect on the surface tension of the solution, whereas disaggregation of the dissolved substance in a solution is likely to produce no change in the surface tension, as aggregation implies merely coalescing particles to form larger groups, with no change in molecular species. it is possible that in solution a dynamic equilibrium exists between the particles and the aggregates, though the actual concentration of disaggregated material may be small. The results of the present work offer support to the theory that the effect of heat on dilute rubber solutions involves chemical depolymerization, that is, a breaking up of the long rubber molecules into shorter ones.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

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