scholarly journals Methyl thymol blue solution and film dosimeter for high dose measurements

2021 ◽  
Vol 23 ◽  
pp. 103980
Author(s):  
Khalid A. Rabaeh ◽  
Sarah A. Aljammal ◽  
Molham M. Eyadeh ◽  
Khalid M. Abumurad
Keyword(s):  
Thymol Blue ◽  
High Dose ◽  
Blue Solution ◽  
Dose Measurements

The Lid-Driven Cavity Flow: A Synthesis of Qualitative and Quantitative Observations

1984 ◽  
Vol 106 (4) ◽  
pp. 390-398 ◽  
Author(s):  
J. R. Koseff ◽  
R. L. Street
Keyword(s):  
Heat Flux ◽  
Flow Visualization ◽  
Three Dimensional ◽  
Symmetry Plane ◽  
Lower Boundary ◽  
Thymol Blue ◽  
Width Ratio ◽  
Cavity Depth ◽  
Driven Cavity ◽  
Turbulent Characteristics

A synthesis of observations of flow in a three-dimensional lid-driven cavity is presented through the use of flow visualization pictures and velocity and heat flux measurements. The ratio of the cavity depth to width used was 1:1 and the span to width ratio was 3:1. Flow visualization was accomplished using the thymol blue technique and by rheoscopic liquid illuminated by laser-light sheets. Velocity measurements were made using a two-component laser-Doppler-anemometer and the heat flux on the lower boundary of the cavity was measured using flush mounted sensors. The flow is three-dimensional and is weaker at the symmetry plane than that predicted by accurate two-dimensional numerical simulations. Local three-dimensional features, such as corner vortices in the end-wall regions and longitudinal Taylor-Go¨rtler-like vortices, are significant influences on the flow. The flow is unsteady in the region of the downstream secondary eddy at higher Reynolds numbers (Re) and exhibits turbulent characteristics in this region at Re = 10,000.

Spectrophotometric pH measurement in estuaries using thymol blue and m-cresol purple

2004 ◽  
Vol 91 (1-4) ◽  
pp. 175-186 ◽  
Author(s):  
Luke M. Mosley ◽  
Shamus L.G. Husheer ◽  
Keith A. Hunter
Keyword(s):  
Ph Measurement ◽  
Thymol Blue

scholarly journals Sensitive and rapid titrimetric and spectrophotometric methods for the determination of stavudine in pharmaceuticals using bromate-bromide and three dyes

2008 ◽  
Vol 80 (2) ◽  
pp. 253-262 ◽  
Author(s):  
Kanakapura Basavaiah ◽  
Veeraiah Ramakrishna ◽  
Chikkaswamy Somashekar ◽  
Urdigere R. Anil Kumar
Keyword(s):  
Dosage Forms ◽  
Linear Increase ◽  
Thymol Blue ◽  
Fixed Amount ◽  
Rapid Methods ◽  
Spectrophotometric Methods ◽  
Back Titration ◽  
Bulk Drug ◽  
Hcl Medium

Four sensitive and rapid methods for the determination of stavudine (STV) in bulk drug and in dosage forms were developed and optimized. In titrimetry, aqueous solution of STV was treated with a known excess of bromate-bromide in HCl medium followed by estimation of unreacted bromine by iodometric back titration. Spectrophotometric methods involve the addition of a measured excess of bromate-bromide in HCl medium and subsequent estimation of the residual bromine by reacting with a fixed amount of methyl orange, indigocarmine or thymol blue followed by measurement of absorbance at 520 nm (method A), 610 nm (method B) or 550 nm (method C). In all the methods, the amount of bromate reacted corresponds to the amount of STV. Calculations in titrimetry were based on a 1:0.666 (STV:KBrO3) stoichiometry and the method was found to be applicable over 3.5-10 mg range. A linear increase in absorbance with concentration of STV was observed in the spectrophotometric methods, and the Beer's law was obeyed over the concentration ranges 0.125-1.75, 1-10 and 1-9.0 µg mL-1 STV for method A, method B and method C, respectively. The methods when applied to the determination of STV in tablets and capsules were found to give satisfactory results.

New metal-free catalytic degradation systems with carbon dots for thymol blue

2017 ◽  
Vol 41 (22) ◽  
pp. 13365-13369 ◽  
Author(s):  
Cui Zheng ◽  
Xueqin An ◽  
Tianxiang Yin
Keyword(s):  
Catalytic System ◽  
Carbon Dots ◽  
Aqueous Media ◽  
Catalytic Degradation ◽  
Thymol Blue ◽  
Metal Free

A metal-free catalytic system with carbon dots as a catalyst for thymol blue degradation in slightly alkaline aqueous media.

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