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[en] For estimating redistribution of pulmonary perfusion in congestive heart failure (CHF), Tc-99m MAA pulmonary perfusion images were computerized to digital perfusion images (DPLs), and 100%-70% discount area was defined as hyperperfusion area (H). Various types of DPI were obtained from patients with various degree of CHF; however, they were simply classified into six types according to patterns of H, that is, from basal triangle to apical circle. DPIs changed according to aggravation and improvement of CHF. Patients without H in the lower zone suffered from refractory CHF, and their 2-year mortality was high (59%; 13 of 22). DPIs were useful for determining therapeutic policy and estimating prognosis of patients with CHF

[en] The optical emission of N₂⁺(B²Σ⁺sub(u)→X²Σ⁺sub(g)) induced by energy transfer (Penning ionization) to nitrogen from 2³S metastable helium atoms (He*) has been measured by pulse radiolysis of helium-nitrogen mixtures. The emission decay rate tau^-1 varies as a function of helium or nitrogen pressure, which gives a Penning ionization rate constant k₂(He*+N₂) = (6.8+-0.4)x10^-11cm³ molecule^-1s^-1. (Auth.)

[en] Four different automatic ultrasonic testing and recording systems have been achieved, contributing to the improvement of quality and reliability of welded structures

[en] The Prototype Fast Breeer Reactor ''Monju'' is the first power generating fast breeder reactor in Japon. We have been designing the components of the plant for manufacturing. Among these is the intermediate heat exchanger (IHX) which exchanges heat between primary and secondary sodium loop. The tube sheet of IHX (shell to ligament junction) is a difficult area from the view point of structural strength design under elevated temperature. To validate the structural integrity of tube sheet we performed the series of inelastic analysis and tube sheet thermal shock test using test pieces and half scale model of actual design. The results of inelastic analyses showed there is little progressive deformation around shell to ligament structural discontinuous junction. Furthermore, thermal shock tests showed no increase of an accumulative deformation. By these analyses and experiments, structural relability of tube sheet could be shown

[en] We have measured the contact angle of the ³He-⁴He interface on a sapphire window near the tri-critical temperature T_t=0.87 K. We have found that it is finite and that it increases with temperature above 0.81 K. This behavior is opposite to the 'critical point wetting' which is usually observed near critical points. Our results confirm earlier MRI measurements by Ueno et al. We interpret our observations as due to the critical Casimir effect which leads to an effective attraction of the ³He-⁴He interface by the substrate near the superfluid transition at T_t

[en] The optical emissions of H₂(a ³Σsub(g)⁺→b ³Σsub(u)⁺) and D₂(a ³Σsub(g)⁺→b ³Σsub(u⁺) have been observed by pulse radiolysis of Ar-H₂ and Ar-D₂ mixtures, respectively. These emissions are considered to be induced by energy transfer from an excited argon atom (Ar*) to hydrogen or deuterium. The precursor of H₂(a ³Σsub(g)⁺) or D₂(a ³Σsub(g)⁺) may be considered to be a highly excited argon atom. From the kinetic data, the energy transfer rate constants in each mixture are obtained to be k(Ar*+H₂)=(8.2+-0.4)x10^-11 cm³ molecule^-1s^-1 and k(Ar*+D₂)=(6.8+-0.3)x10^-11 cm³ molecule^-1s^-1. The optical emissions of the second positive emission of nitrogen (C ³PIsub(u)→B ³PIsub(g)) and the first positive emission of nitrogen (B ³PIsub(g)→A ³Σsub(u)⁺) have also been observed in Ar-N₂ mixtures. These emissions are considered to be induced by energy transfer from the lowest metastable states of argon Ar(³Psub(0,2)) to nitrogen, whose rate constant is obtained to be k(Ar(³Psub(0,2)+N₂)=(2.3+-0.1)x10^-11 cm³ molecule^-1s^-1. (Auth.)

[en] Thin shell and large diameter components are distinctive features of fast breeder reactor (FBR). For these structures, evaluations of buckling are very important. This paper describes analytical and experimental evaluations of main structures of FBR. Straight tube buckling of intermediate heat exchanger, and, buckling of cylindrical shell with a circular opening are studied

[en] The triplet state relaxation of benzene in the gas phase has been studied by measuring the phosphorescence of biacetyl induced by energy transfer to biacetyl from benzene in the pulse radiolysis of benzene-h₆--biacetyl and benzene-d₆--biacetyl mixtures. The time to reach the maximum phosphorescence intensity after the electron pulse varies as a function of both benzene and biacetyl pressure, which gives the pressure-independent radiationless transition rate constant for the triplet benzene-h₆ as (5 +- 3) x 10³ s^-1 and that for benzene-d₆ as (1.3 +- 0.7) x 10⁴ s^-1 and the rate constant for deactivation of the triplet state by collisions with the ground state benzene-h₆ as (1.1 +- 0.2) x 10^-13 cm³ molecule^-1 s^-1 and that for benzene-d₆ as (3.9 +- 0.8) x 10^-14 cm³ molecule^-1 s^-1. 2 tables, 6 figures

[en] There have been possibilities to occur water hammer in pipelines of turbine system for nuclear or fossil fuel power plants. According to the NUREG report, approximately 150 events have been reported since 1969, we also have an experience recently. Water hammer occurs due to sudden steam condensation with pressure pulse. This kind of pressure pulses has been made by alternative producing and condensing of steam slug in the pipe and its frequency relates subcooling and pipe structures. This paper presents our current experience on water hammer with some experimental studies. The present experiment has been performed to obtain the data base for evaluating the pressure pulses. The test pipe was horizontal tubes with dead end connected to vertical tube which simulating drain line in PWR secondary system. The main results are shown as follows; Magnitude of pressure pulse depends drain velocity and initial subcooling. Pipe structure effects on the frequency and continual time of water hammer phenomenon. A new modeling for quantitative explanation of the phenomena is also presented