Showing papers by "National Tsing Hua University published in 1969"
TL;DR: Proton magnetic resonance evidence in carbon tetrachloride medium is given for the formation of the keto hydrates of hexafluoroacetylacetone(HHFA), thenoyltrifluoromethyl groups in HTTA, phenyl group in HBTA, and methyl group in HTFA as discussed by the authors.
3 citations
TL;DR: In this paper, the average concentration obtained was 397 pCi/kg or 89.8 pCiu/gCa for 90Sr and 116.2 pCci/gCA for 137Cs.
Abstract: Samples of Taiwan the product were collected and investigated for 90Sr and 137Cs contents by radiochemical analysis in 1968.The average concentration obtained was 397 pCi/kg or 89.8 pCi/gCa for 90Sr and 116.2 pCi/kg or 7.09 pCi/gCa for 137Cs. The ratio 137Cs/90Sr was found to be 0.29. A compariso nwith previous reports by different authors is given, and an intercomparison run of 90Sr and 137Cs concentration in diet sample is also included.
3 citations
TL;DR: In this article, the crystal structure of bis-cyclopentadienyl beryllium was investigated by analysis of three-dimensional X-ray diffraction data both at room temperature (RT) and at 120°C (LT).
Abstract: The crystal structure of bis-cyclopentadienyl beryllium has been investigated by analysis of three-dimensional X-ray diffraction data both at room temperature (RT) and at 120°C(LT). For data collection, Cu K∞ radiation and equal-inclination, multiple-film Weissenberg technique were used. Data collected were 0–3 along a, and 0–3 along b for RT, and 0–2 along a and 0–2 along b for LT.
Crystal data obtained are:
3 citations
TL;DR: Magnesium chromate anhydrate, magnesium chromate monohydrate and sodium chromate quadrahydrate were irradiated in the Liquid Nitrogen Temperature Loop at the Japan Atomic Energy Research Institute to study the behavior of 51Cr recoil atoms as discussed by the authors.
Abstract: Magnesium chromate anhydrate, magnesium chromate monohydrate and sodium chromate quadrahydrate were irradiated in the Liquid Nitrogen Temperature Loop at the Japan Atomic Energy Research Institute to study the behavior of 51Cr recoil atoms The initial retentions of recoil 51Cr were measured at −55°, −40° and −30°C, and the thermal annealing behavior of recoil 51Cr was examined extensively in the temperature range from −20° to 80 °C The effects of difference in total irradiation dose and of the water of crystallization on the annealing behaviors of 51Cr recoil atoms are discussed
2 citations
01 Jan 1969
1 citations
TL;DR: In this article, the trans-to- cis-2-butene ratio was studied as a function of pressure at room temperature and the ratio is larger than unity at low pressures and within experimental error is about constant and close to unity at high pressures.
Abstract: The isomerization of vibrationally excited methylcyclopropane and the trans- to cis-2-butene ratio were studied as a function of pressure at room temperature. The ratio is larger than unity at low pressures and within experimental error is about constant and close to unity at high pressures.
1 citations
TL;DR: In this article, the dissociation constants of m-, and p-phenylenediaminetetraacetic acid have been determined potentiometrically at room temperature (about 25°C) in an ionic strength of 0.10 M KNO3.
Abstract: The dissociation constants of m-, and p-phenylenediaminetetraacetic acid (m-, and p-, PDTA) have been determined potentiometrically at room temperature (about 25°C) in an ionic strength of 0.10 M KNO3. The stability constatns of their metal complexes have also been determined by UV spectroscopic, potentiometric, and polarographic methods. The formula of the metal complexes by spectroscopic and polarographic methods are both in good agreement to be 1:1. The order of the stability of the metal complexes is:
Cu>Ni>Zn>Co>Cd>Mg, Ca, Ba, Sr.
Which is in accordance with Irving-William stability order.
1 citations
TL;DR: In this paper, a portable high-volume sampler (Staplex) was used near the iodine prod prod prodtion fume hood where the laboratory people worked, which was operated at an air flow rate of 25 CFM or at the face velocity of 90 m/min for 30 minutes.
Abstract: 2. Sampling The activated charcoal sieved by mesh 3040 was used as the absorbent. The charcoal was wrapped in a piece of thin and loose cotton cloth. Those cartridges in three layers were used as the filters of a portable highvolume sampler (Staplex). Sampling was performed near the iodine produdtion fume hood where the laboratory people worked . The sampler was operated at an air flow rate of 25 CFM or at the face velocity of 90 m/min for 30 minutes. A gamma scintillation counter was used to detect the adsorbed iodine in each layer. The presence of 131I was checked by means of half-life tracing and gamma-ray spectrometry. The iodine adsorption efficiency in the outmost layer which has 70 g activated charcoal, 1.3 cm thick, was 90%3). The cotton cloth wrapper showed no significant activity. The middle and the inner layers had a total adsorption efficiency of 10%. This was proved by measuring the activity of each layer, and the activity of the inner layer was close to the background activity. Iodine monitoring was also performed during individual production processes, the dissolution process, the electrolysis process, and the adsorption process. The continuous weekly monitoring was done by means of a continuous air monitor (Nuclear Measurement Corporation) connected to an activated charcoal column 3.5 cm in inside diameter. The air flow rate was set at 8 CFM or the face velocity was 235 m/min. The charcoal was changed at intervals of 24 hours. Sampling was performed in the air exhaust system of the fume hood where an opening well fits the air tubing to the monitor.