utilization of photodisintegration reaction of deuterium, 2h(?,n)1h, is a precise technique for determining the percentage of 2h in tritiated and natural water. the 23na(n,?)24na reaction is a suitable ?-source for producing the 2h(?,n)1h reaction. tehran research reactor was used as a neutron source for producing 24na isotopes. the bf3 detectors were used to detect the neutron emission of h2 c...

introduction cr-39 detectors are widely used for radon and progeny measurement in the air. in this paper, using the monte carlo simulation, the possibility of using the cr-39 for direct measurement of radon and progeny in water is investigated. materials and methods assuming the random position and angle of alpha particle emitted by radon and progeny, alpha energy and angular spectrum that arri...

In this article, the ternary phase diagram in polyamide-6 (PA6)/Formic acid (FA)/Water system was constructed by experimental measurement. The determination of binodal curve was measured according to titration of the PA6 polymer solution with water as a non-solvent until the onset of turbidity. Also, the phase separation process of the prepared membranes structures system was investigated. The ...

Systematic investigations into the structure of measurement error of physical activity questionnaires are lacking. We propose a measurement error model for a physical activity questionnaire that uses physical activity level (the ratio of total energy expenditure to basal energy expenditure) to relate questionnaire-based reports of physical activity level to true physical activity levels. The 19...

Systematic investigations into the structure of measurement error of physical activity questionnaires are lacking. We propose a measurement error model for a physical activity questionnaire that uses physical activity level (the ratio of total energy expenditure to basal energy expenditure) to relate questionnaire-based reports of physical activity level to true physical activity levels. The 19...

Self-diffusion NMR is used to investigate monodispersed oil in water emulsions and the subsequent gel formed by removing the water through evaporation. The radius of the oil droplets in the emulsions is measured using a number of diffusion methods based on the measurement of the mean squared displacement of the oil, water, and tracer molecules. The results are consistent with the known size of ...

The measurement of Oxidation-Reduction Potential (ORP) can be used in the water/steam cycle of a power plant to infer information about system reactions to water chemistry. While the measurement of ORP is by no means a new measurement, the high purity water of the water/steam cycle is a relatively new application for ORP. This presents a challenge since little information is available on proper...

Water is a major component of all living things. It is anomalous in many of its physical and chemical properties. Some are essential for life while others have profound effects on the size and shape of living organisms, how they work, and the constraints within which they must operate. Many of water’s basic physical properties can now be explained, at least semiquantitatively, in molecular and ...