Showing papers by "Japan Atomic Energy Research Institute published in 1977"
TL;DR: In this article, a binary collision model by the Monte Carlo method is proposed for plasma simulations with particle codes, which describes a collision integral of the Landau form, and the results are in good agreement with theoretical ones.
554 citations
TL;DR: The superlattice structure of (ND 4 ) 2 BeF 4 in the intermediate phase (T c T T T I, T c = 163.5 K and T I = 173 K) is incommensurate with the periodicity of the basic structure.
89 citations
TL;DR: In this paper, aqueous solutions of poly(vinyl alcohol) (PVA), poly(ethylene oxide), polyacrylamide, polyvinylpyrrolidone, and methyl cellulose were cast on a glass plate and irradiated with electron beams to yield crosslinked hydrogels.
47 citations
TL;DR: In this paper, the dielectric properties of a single crystal (NH 4 ) 3 H(SeO 4 ) 2 were measured below room temperature and two phase transitions were found at around +2°C and at -92°C.
Abstract: Dielectric properties of single crystal (NH 4 ) 3 H(SeO 4 ) 2 were measured below room temperature Two phase transitions were found at around +2°C and at -92°C A λ-type peak of the dielectric constant along the c -direction is found at -92°C, and the crystal shows ferroelectricity below the transition The temperature dependence of the spontaneous polarization was measured by a pyroelectric method The Curie temperature linearly increases with increasing hydrostatic pressure up to 85 kbar with a slope of 23 deg kbar -1
47 citations
TL;DR: In this article, the formation of uranium mononitride by the reaction between UO2 and C in an ammonia stream, a mixed 75%H2-25%N2 stream, and a mixed 8% H2-92% N2 stream has been studied at 1400-1600°C.
42 citations
Patent•
07 Nov 1977TL;DR: In this paper, a graft copolymer consisting of a backbone chain of a fluoropolymer and side chains grafted thereon consisting essentially of at least a member selected from the group consisting of acyloxy styrene, diacyloxystyrene, hydroxystyrene and dihydroxystyrene or consisting essentially a mixture of at most a member from the groups mentioned above and a polyene compound.
Abstract: A novel graft copolymer and a process for the production thereof is disclosed, said graft copolymer comprising a backbone chain of a fluoropolymer and side chains grafted thereon consisting essentially of at least a member selected from the group consisting of acyloxystyrene, diacyloxystyrene, hydroxystyrene and dihydroxystyrene or consisting essentially of a mixture of at least a member selected from the group mentioned above and a polyene compound. The grafting is conveniently carried out with the aid of an ionizing radiation. The novel graft copolymer has a wide variety of uses due to its improved characteristic properties such as, for example, improved adhesion properties, improved dyeing properties, improved reactivity to other compounds and the like.
40 citations
TL;DR: In this article, the triammonium hydrogen diselenate (NH 4 ) 3 H(SeO 4 ) 2 has phase transitions at -8°C and -92°C.
Abstract: Dielectric measurements indicate that triammonium hydrogen diselenate (NH 4 ) 3 H(SeO 4 ) 2 has phase transitions at -8°C and -92°C. A λ-type maximum of dielectric constant along the c -axis was found at -92°C. Below the transition the compound is ferroelectric with the saturated spontaneous polarization of about 1.4 µC cm -2 .
36 citations
TL;DR: In this paper, the authors measured the equilibrium hydrogen pressure in Li-LiH and liquid LiH with dilute solutions of 2.0 x 10/sup -3/ to 1.3 x 10 /sup -2/ atomic ratio (H/Li) at temperatures between 200 and 450/sup 0/C.
Abstract: Equilibrium hydrogen pressures (P/sub H/sub 2//) were measured for the two-phase system, Li-LiH, for the liquid lithium of dilute solutions of 2.0 x 10/sup -3/ to 1.3 x 10/sup -2/ atomic ratio (H/Li), and for the liquid lithium controlled by a cold trap at temperatures between 200 and 450/sup 0/C. From the variation of P/sub H/sub 2// with temperature, the apparent heat of solution of hydrogen in liquid lithium was obtained as 34 and 19 kcal/mol for the Li-LiH and for the dilute solutions, respectively. For the liquid lithium controlled by the cold trap at 203/sup 0/C, the heat of solution was 19 kcal/mol. Using the Sieverts constant, which was obtained experimentally in this work, it was possible to determine the hydrogen concentration in liquid lithium from the P/sub H/sub 2//. The hydrogen-solubility in liquid lithium in the concentration <2 x 10/sup -2/ H/Li (corresponding to the temperature lower than 350/sup 0/C) was estimated from the hydrogen concentration data obtained through the P/sub H/sub 2// of the Li-LiH system. Although the cold trap could effectively control the hydrogen concentration in liquid lithium, this solubility was apparently lower than that obtained from the Li-LiH by factors of 2 to 3 atmore » the same temperature. The difference can be attributed to the interactions among hydrogen and other impurities and to compound formations such as Li/sub 2/H.« less
32 citations
TL;DR: In this paper, the dielectric properties of deuterated triammonium deuterium disulfate have been studied at 1 atm in the temperature region between -170° C and 25° C.
Abstract: The dielectric properties of deuterated triammonium deuterium disulfate have been studied at 1 atm in the temperature region between -170° C and 25° C . It has been found that the crystal is ferroelectric in two phases. The spontaneous polarization is 2.15 µCoul·cm -2 at -170° C . The present results indicate a large isotope effect on ferroelectric activity.
31 citations
TL;DR: In this paper, it has been ascertained that the maximum pulsing with 4.67$ (=3.41%δk) brings peak reactor power of 21,100 MW and core energy release of 117 MW·sec.
Abstract: The NSRR programme is in progress in JAERI using a pulsed reactor to investigate fuel behaviors under the reactivity-initiated accident conditions. Pulsing characteristics and experimental capability, especially heat deposition in test fuel rods given by a single pulse are key parameters to this purpose. In pulsing performance tests, it has been ascertained that the maximum pulsing with 4.67$ (=3.41%δk) brings peak reactor power of 21,100 MW and core energy release of 117 MW·sec. The calculated time responses of reactor power, fuel temperature and cladding surface temperature as well as these maximum values at various pulse sizes agreed well with measured data. In addition, it has been also ascertained by measurement as well as analysis that there are no essential differences in pulsing characteristics between the pulsing from critical and that from subcritical. The heat deposition in a test fuel rod given by a single pulse is much enough as predicted, and a 2.6% enriched BWR type fuel rod gains about 230...
29 citations
TL;DR: A cycloidal magnetic structure was discovered in CrB2 by neutron diffraction using a thin single crystal plate prepared with natural boron in this paper, where the magnetic moments of a magnitude of 0.5 ± 0.1μB turn in the a−c plane.
TL;DR: In this paper, the phase diagram of NH 4 3 H(SO 4 ) 2 was studied by means of dielectric and differential thermal analysis measurements in a range of p{\lesssim}8.5\) kbar, -100°C, and 150°C with a slope of -5.76 deg kbar -1.
Abstract: The pressure-temperature phase diagram of (NH 4 ) 3 H(SO 4 ) 2 was studied by means of dielectric and differential thermal analysis measurements in a range of \(p{\lesssim}8.5\) kbar, –100°C \({\lesssim}T{\lesssim}\)150°C. The I-II transition point (140°C at 1 atm) linearly decreases with increasing hydrostatic pressure with a slope of -5.76 deg kbar -1 . The pressure dependence of the II-III transition point is expressed by a quadratic equatuon T c = T 0 c + K p +γ p 2 with parameters of T 0 c =-8.1^° C , K =-3.7 deg kbar -1 , and γ=-0.13 deg kbar -2 . Two pressure-induced ferroelectric phases (Phases VI, VII) are found above about 5 kbar. The II-III-VI triple point is found at p =7.0 kbar, T =-40.5^° C .
Patent•
13 Jul 1977TL;DR: A graft copolymer is a membrane prepared by co-grafting a mixture of monomers consisting essentially of acyloxystyrene and/or hydroxystyrene, a polyene compound and at least one member selected from the group consisting of acrylic acid, methacrylic acid and esters of these acids onto a hydrocarbon type of fluorine-containing type polymer by means of ionizing radiation.
Abstract: A graft copolymer membrane prepared by co-grafting a mixture of monomers consisting essentially of acyloxystyrene and/or hydroxystyrene, a polyene compound and at least one member selected from the group consisting of acrylic acid, methacrylic acid and esters of these acids onto a hydrocarbon type of fluorine-containing type polymer by means of ionizing radiation exhibits improved mechanical strength and reduced electrical resistance and provides an excellent ion-exchange membrane.
TL;DR: In this article, a circular tube cooled by constant turbulent flow of water was heated stepwise with time, and an analytical expression for the variation of heat-transfer coefficient was obtained.
TL;DR: In this paper, the phase diagram of ferroelectric NH 4 HSO 4 was studied by means of dielectric and differential thermal analysis (DTA) measurements in a pressure and temperature region of
Abstract: The pressure-temperature phase diagram of ferroelectric NH 4 HSO 4 was studied by means of dielectric and differential thermal analysis (DTA) measurements in a pressure and temperature region of \(p{\lesssim}8\times10^{3}\) kg cm -2 , –120°C \({\lesssim}T{\lesssim}\)200°C. The high pressure phase found by Bridgman above about 1×10 3 kg cm -2 at room temperature is proven not to be identical with the low temperature non-ferroelectric phase (Phase III) at 1 atm. The liquidus line was newly determined by DTA. A new high pressure phase (Phase VI) was found above 4×10 3 kg cm -2 just below the melting point. A change in the order of the transition at the upper Curie point was found at about 0.6×10 3 kg cm -2 .
TL;DR: In this paper, the elastic after effect of Mo single crystals with various orientations were measured after fast neutron irradiation at about 5 K. Two prominent relaxations were observed at 8 K and 26 K (at relaxation time ≈2 min).
Abstract: The elastic after-effect of Mo single crystals with various orientations were measured after fast neutron irradiation at about 5 K. Two prominent relaxations were observed at 8 K and 26 K (at relaxation time ≈2 min). These two relaxations correspond, respectively, with the 12 K and 39 K peaks in previous high frequency experiments (at vibrational frequencies ≈500 Hz). The 26 K relaxation was found to be about 2.5 times larger in strength than that expected from the unstable 39 K peak observed in the high frequency measurements. The 8 K and 26 K relaxations annealed out in the recovery stages I (∼28 K) and IIa (∼42 K), respectively. Their dependence on irradiation fluence and orientation and their independence on pre-irradiation deformation and/or doping indicate that these relaxations are caused by intrinsic point defects, in good agreement with observations in the high frequency measurements. The origins of these two relaxations are considered to be a stress-induced rotation of free (110) split-...
Patent•
15 Aug 1977TL;DR: In this paper, a process for producing a reactive aqueous emulsion comprising dispersing a monomer mixture of 65.0 - 98.8% by weight of radical polymerizable hydrophobic unsaturated monomer having one ethylenic unsaturated bond was described.
Abstract: A process for producing a reactive aqueous emulsion comprising dispersing a monomer mixture of (a) 65.0 - 98.8% by weight of radical polymerizable hydrophobic ethylenic unsaturated monomer having one ethylenic unsaturated bond, (b) 1.0 - 30.0% by weight of radical polymerizable ethylenic unsaturated monomer having a glycidyl group and (c) 0.2 - 5.0% by weight of a radical polymerizable ethylenic unsaturated monomer having a carboxylic group in water by virtue of a restricted amount of surface active agent and irradiating with an ionizing radiation for a total dose of more than 0.01 Mrad at temperatures ranging from -5° C. to 50° C. This reactive aqueous emulsion does not contain low-molecular water-soluble compounds such as a radical polymerization initiator, a pH regulator, etc. and can form a film having improved properties.
TL;DR: Radio-resistant red pigmented micrococci were propagated from radurized sawdust culture media of mushroom subjected to from 1.0 to 2.0 Mrad and stored for one month at 20°C and the resistances to gamma-radiation of these isolates were the same as that of strain R1.
Abstract: Radio-resistant red pigmented micrococci were propagated from radurized sawdust culture media of mushroom subjected to from 1.0 to 2.0 Mrad and stored for one month at 20°C. Three strains, H 48, H 54 and H 55, were isolated from different samples of sawdust media. Many of the characteristics of strains H 54 and H 55 were the same as those of Micrococcus radiodurans R1 isolated by Anderson et al. On the contrary, strain H 48 had some distinct characteristics such as small cell size, nitrate-reducing property, requirement of riboflavin with thiamine for growth and salt-torelance. The GC content of the DNA of these strains ranged from 65 to 67 moles %, and their cell wall peptidglycan contained ornithine type subunit to warrant their description as the species of Micrococcus radiodurans.The resistances to gamma-radiation of these isolates were the same as that of strain R1. However, the shape of survival curves differed among the strains. The curves of H 54 and H 55 were sigmoidal like that of strain R1, but...
TL;DR: In this paper, the energy response of a 6 LiF TLD to neutrons reported previously was revised by experiments, and the kermas of 6 and 7 TLDs were calculated more accurately, and compared with the experimental energy response.
TL;DR: In this article, surface erosion in pyrolytic graphite by 100 keV 4 He + and 200 keV H + 2 ion bombardment has been observed by scanning electron microscopy.
TL;DR: The relation between deflection and load during the ring compression test used to study mechanical properties of a fuel cladding tube is examined by a computer program which deals with the elasto-plastic deformation by the two-dimensional finite element method.
TL;DR: In this paper, the authors analyzed the magnetic surface near a separatrix of a divertor and found that magnetic surfaces near the divertor can be destroyed by perturbations of magnetic fields brought from discrete structure of magnetic coils.
Abstract: The destruction of magnetic surfaces near a separatrix of a divertor is analyzed. Unperturbed magnetic surfaces formed by a plasma current and a divertor current are assumed. Destruction of magnetic surfaces is attributed to perturbations of magnetic fields, which are assumed to be brought from discrete structure of magnetic coils. Analysis is based on “Stochasticity” and a spread of divertor region is calculated in terms of a ripple of the magnetic field.
TL;DR: In this paper, the leachability of 90Sr from a cement composite into an aqueous phase has been studied by the method recommended by IAEA and the amount leached was measured as functions of waste to cement ratio (Wa/C), salt content of waste, temperature of leachant and curing time of specimens.
TL;DR: In this article, a multivariable autoregressive modeling technique was used to identify the dynamics of a boiling water reactor under perturbation and normal operation conditions, and the identified models were compared with each other in order to clarify the difference in identifiability of the dynamics under these experimental conditions.
TL;DR: Differential cross sections for elastic and inelastic scattering of neutrons leading to the 2.230 (2 + ) and 5.007 MeV (3 - ) states were measured at an incident energy of 21.5 MeV as mentioned in this paper.
TL;DR: In this paper, pressure-volume-temperature (P-V-T) relations were studied for cis-1,4-polybutadiene, cis-l, 4-polyisoprene, and poly(styrene-butadienes) in the pressure range of 1 to 8000 kg/cm2 at 10 to 50°C.
Abstract: The pressure-volume-temperature (P-V-T) relations were studied for cis-1,4-polybutadiene, cis-l,4-polyisoprene, and poly(styrene-butadiene) in the pressure range of 1 to 8000 kg/cm2 at 10 to 50°C. The specific volume of cis-1,4-polybutadiene and cis-1,4-polyisoprene decreased with increasing pressure and abruptly decreased at a certain pressure (low-pressure break). Above this pressure, the specific volume decreased smoothly with increasing pressure and then decreased abruptly again (high-pressure break). The compressibilities below and above the low-pressure break were of the order of 10−5 (kg/cm2)−1 up to the high-pressure break. Above the high-pressure break, the compressibilities reduced to the order of 10−6 (kg/cm2)−1. The P-V isotherms for poly(styrenebutadiene) showed only the high pressure break. An abrupt increase in specific volume occurred in the isobaric measurements for cis-l,4-polyisoprene at a pressure and temperature corresponding to the high-pressure break in the isotherms. From ...
TL;DR: In this paper, precise measurements of burnup and accumulated transuranium elements were carried out on specimens which were taken out from spent fuel of Japan Power Demonstration Reactor (JPDR)-I, by means of chemical analysis and γ-ray spectrometry.
Abstract: Precise measurements of burnup and accumulated transuranium elements were carried out on specimens which were taken out from spent fuel of Japan Power Demonstration Reactor (JPDR)-I, by means of chemical analysis and γ-ray spectrometry. Results of the measurements are summarized numerically. Core configuration and operational history of the reactor are also described.