scholarly journals A new screening test to evaluate the presence of oxidizable sulphide minerals in coarse aggregates

2021 ◽  
Author(s):  
Bassili Guirguis ◽  
Medhat Shehata
Keyword(s):  
Mass Loss ◽  
Screening Test ◽  
Room Temperature ◽  
Colour Change ◽  
Test Solution ◽  
Oxidizing Agent ◽  
Sulphide Minerals ◽  
Coarse Aggregates ◽  
Aggregate Sample ◽  
Simple Screening

A simple screening test was proposed in order to test coarse aggregates for their potential to cause damage when used in concrete due to the oxidation of sulphide phases. The test involves submerging an aggregate sample in an oxidizing agent and measuring the mass loss. Samples with no known oxidizable sulphides showed a mass loss of <1.0% after one week of testing at room temperature. Samples of oxidizable sulphides showed a mass loss higher than 3.5% and changes in the colour of the test solution. It is proposed that aggregates which achieve a mass loss of less than 0.50% and no colour change in the test solution be accepted.

scholarly journals A new screening test to evaluate the presence of oxidizable sulphide minerals in coarse aggregates

2021 ◽  
Author(s):  
Bassili Guirguis ◽  
Medhat Shehata
Keyword(s):  
Mass Loss ◽  
Screening Test ◽  
Room Temperature ◽  
Colour Change ◽  
Test Solution ◽  
Oxidizing Agent ◽  
Sulphide Minerals ◽  
Coarse Aggregates ◽  
Aggregate Sample ◽  
Simple Screening

A simple screening test was proposed in order to test coarse aggregates for their potential to cause damage when used in concrete due to the oxidation of sulphide phases. The test involves submerging an aggregate sample in an oxidizing agent and measuring the mass loss. Samples with no known oxidizable sulphides showed a mass loss of <1.0% after one week of testing at room temperature. Samples of oxidizable sulphides showed a mass loss higher than 3.5% and changes in the colour of the test solution. It is proposed that aggregates which achieve a mass loss of less than 0.50% and no colour change in the test solution be accepted.

A new screening test to evaluate the presence of oxidizable sulphide minerals in coarse aggregates

2021 ◽  
Author(s):  
Bassili Guirguis ◽  
Medhat Shehata
Keyword(s):  
Mass Loss ◽  
Screening Test ◽  
Room Temperature ◽  
Colour Change ◽  
Test Solution ◽  
Oxidizing Agent ◽  
Sulphide Minerals ◽  
Coarse Aggregates ◽  
Aggregate Sample ◽  
Simple Screening

A simple screening test was proposed in order to test coarse aggregates for their potential to cause damage when used in concrete due to the oxidation of sulphide phases. The test involves submerging an aggregate sample in an oxidizing agent and measuring the mass loss. Samples with no known oxidizable sulphides showed a mass loss of <1.0% after one week of testing at room temperature. Samples of oxidizable sulphides showed a mass loss higher than 3.5% and changes in the colour of the test solution. It is proposed that aggregates which achieve a mass loss of less than 0.50% and no colour change in the test solution be accepted.

Assessment of operability for common arterial trunk without cardiac catheterisation

2005 ◽  
Vol 15 (3) ◽  
pp. 241-244 ◽  
Author(s):  
Amir-Reza Hosseinpour ◽  
Elliot A. Shinebourne
Keyword(s):  
Risk Factor ◽  
Vascular Disease ◽  
Screening Test ◽  
Surgical Repair ◽  
Cardiac Catheterisation ◽  
Pulmonary Vascular Disease ◽  
Older Children ◽  
Common Arterial Trunk ◽  
Arterial Trunk ◽  
Simple Screening

Pulmonary vascular disease is a risk factor for the surgical management of common arterial trunk. Surgical repair, therefore, is usually performed in early infancy, before irreversible changes can occur in the epulmonary vasculature. Because of this, there has been an increasing tendency to dispense with cardiac catheterisation as a means of assessing pulmonary vascular disease. Cardiac catheterisation, nonetheless, is still performed when there is a risk of pulmonary vascular disease, such as in older children. There are no clear guidelines, however, as to who should be catheterised. We have developed a simple screening test to help make this decision.

Experience with a Simple Screening Test for Serotonin

1958 ◽  
Vol 51 (7) ◽  
pp. 836-840 ◽  
Author(s):  
HOWARD C. ELLIOTT ◽  
ALBERT E. CASEY
Keyword(s):  
Screening Test ◽  
Simple Screening

scholarly journals EFFECT OF MATURITY STAGES ON QUALITY AND SHELF LIFE OF “SOLO” PAPAYA FRUITS DURING STORAGE

2019 ◽  
pp. 57-68
Keyword(s):  
Ambient Temperature ◽  
Shelf Life ◽  
Cold Storage ◽  
Room Temperature ◽  
Colour Change ◽  
Soluble Solids ◽  
Maturity Stages ◽  
Solids Content ◽  
Sensorial Evaluation ◽  
Stage 1

“Solo” papaya fruits were harvested in October, 2016 & 2017 seasons from a commercial orchard located in Ismailia Governorate, Egypt. Papaya fruits were harvested at three maturity stages: 25% yellow (stage 1), 50% yellow (stage 2) and 100% yellow (stage 3) and evaluated during storage at ambient temperature (20°C ± 2) for 4 days + at 80- 85% RH or during cold storage at 6°C + 90- 95% RH for 20 days. Papaya fruits softened very rapidly at room temperature after harvest and had 4 days shelf life. However, the fruit can be stored for 20 days at 6°C with little changes in firmness and the fruit apparently progressed in normal ripening upon removal to ambient temperature (20°C) for 3 days. All colour values (a*, L* and C*) were linearly increased during cold storage. Conversely, as a result of colour change from green to orange-red, h° values decreased. Soluble solids content was not affected during ripening at 20°C and remained steady. Fruit harvested at stage 2 and stored at 6°C for 20 days following 3 days at 20°C had superior score for sensorial evaluation.

A PATCH TEST FOR CHLORIDE IN SWEAT AS A SIMPLE SCREENING METHOD FOR DETECTING CYSTIC FIBROSIS OF THE PANCREAS

PEDIATRICS ◽  
1959 ◽  
Vol 23 (4) ◽  
pp. 731-737
Author(s):  
Louis Gluck
Keyword(s):  
Cystic Fibrosis ◽  
Patch Test ◽  
Screening Test ◽  
Screening Method ◽  
Diagnostic Methods ◽  
Simple Screening

A simple patch test, designed as a screening test for cystic fibrosis of the pancreas, is reported in preliminary form. In trials carried out with 207 patients it has proved accurate and reliable. A brief resume of the physiology of sweating, especially as pertinent to diagnostic methods in pediatrics, is also presented. Studies are in progress aiming toward further refinement of this method.

A SIMPLE SCREENING TEST FOR HISTIDINURIA

PEDIATRICS ◽  
1969 ◽  
Vol 43 (1) ◽  
pp. 40-43
Author(s):  
Marcia G. Gerber ◽  
Donald A. Gerber
Keyword(s):  
Mental Retardation ◽  
Urine Sample ◽  
Screening Test ◽  
Blue Color ◽  
Childhood Disease ◽  
Cupric Ion ◽  
Simple Screening ◽  
Urine Specimens

Histidinemia, a childhood disease associated with mental retardation, can be identified by the presence of histidinuria. A rapid and simple screening test for histidinuria has been developed by the authors and is based on the inhibition by histidine of the blue color formed by the reaction of cupric ion and bis-cyclohexanone oxaldihydra-zone. The formation of a colorless solution in this test should identify all urine specimens in which the concentration of histidine is greater than 60 mg/l00 ml and most specimens in which the concentration of histidine is greater than 20 mg/100 ml. By appropriate dilution of a urine sample, the screening test may be used to estimate, semi-quantitatively, the concentration of histidine in urine.

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