WATER PERMEABILITY OF COATING FILMS USING A RADIOISOTOPE TRACER TECHNIQUE

1970 ◽  
Author(s):  
Eddy S. Matsui
Keyword(s):  
Water Permeability ◽  
Tracer Technique ◽  
Coating Films ◽  
Radioisotope Tracer

Sulfur uptake determination on Ni containing molybdena-alumina samples by radioisotope tracer technique

2008 ◽  
Vol 66 (9) ◽  
pp. 1190-1195 ◽  
Author(s):  
Pál Tétényi ◽  
Tamás Ollár ◽  
Zoltán Schay ◽  
Péter Schnörch ◽  
Tibor Szarvas
Keyword(s):  
Tracer Technique ◽  
Radioisotope Tracer

Uptake from soil and distribution of 95Zr in Chinese cabbage

2002 ◽  
Vol 139 (4) ◽  
pp. 431-435 ◽  
Author(s):  
J. SHI ◽  
J. GUO
Keyword(s):  
Chinese Cabbage ◽  
Irrigation Treatment ◽  
Radiation Hazard ◽  
Simulated Rainfall ◽  
Tracer Technique ◽  
Similar Concentration ◽  
Soil System ◽  
Strong Adsorption ◽  
Radioisotope Tracer ◽  
Different Parts

In order to quantify the radiation hazard to humans through food, both migration and distribution of 95Zr in Chinese cabbage/soil system were examined by using the radioisotope tracer technique. When 95Zr was administered with simulated irrigation or simulated rainfall, 95Zr was detected in every part of Chinese cabbage, which indicated that 95Zr could be translocated to above-ground parts. Although concentrations of 95Zr in different parts of Chinese cabbage were different in the two treatments used in the present study, the patterns of 95Zr distribution in different parts of the plant were similar. Concentration of 95Zr in each part of Chinese cabbage followed the order of root>leaf>lower part of petiole>upper part of petiole>bud in the case of simulated irrigation. Moreover, the 95Zr could be accumulated in leaves after being taken up by roots. In the simulated irrigation treatment, 95Zr concentrations were 1·7 and 2·9 times higher in the leaf than in the petiole and bud, respectively. In the case of simulated rainfall, a portion of applied 95Zr precipitated on the above-ground parts of Chinese cabbage, which led to a higher concentration here than in the case of simulated irrigation. The results of the present study clearly indicate that there is a distinct possibility that foodstuffs produced in the 95Zr-contaminated area are radioactively contaminated. More than 90% of total 95Zr in soil was retained in the upper layer (0–8 cm), which indicated 95Zr could not easily move downwards because of strong adsorption to soil.

Studies of Vitamin B12 Metabolism in Patients with Chronic Hepatitis and Liver Cirrhosis

1968 ◽  
Vol 07 (04) ◽  
pp. 371-387
Author(s):  
T. Spârchez ◽  
B. Gheorghescu ◽  
Gh. Jovin ◽  
Elena Merculiev
Keyword(s):  
Liver Cirrhosis ◽  
Chronic Hepatitis ◽  
Vitamin B12 ◽  
Tracer Technique ◽  
Storage Compartment ◽  
And Storage

SummaryWe have studied the kinetiks of vitamin B12 and especially the liver compartment, in 28 normals and 76 patients with chronic hepatitis and liver cirrhosis.The study was carried out by means of vitamin B12 58Co, administered per os (alone or followed by “flushing dosis”), vitamin B12 57Co administered intravenously and by double tracer technique.Our results indicate the Pertubation of intrahepatic storage compartment of radiocobalamine, in patients with chronic hepatitis and especially in patients with active hepatitis and in cirrhotics.This deficiency can be explained probably, by an alteration of the transport to the liver of the absorbed vitamin B12, by an inadequate chemical forme, by hepatic enzymatic disturbances or by excessive handling and storage in extrahepatic compartment.

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

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