[en] Adiabatic compressibilities of several bis(tetraalkylammonium) bromide (bolaform) salts have been measured in H₂O and D₂O. Infinite dilution values of phi/sub Ks/⁰ have been obtained by extrapolation based on results determined to low concentrations. The change in compressibility at infinite dilution is not monotonic within the series although it decreases with increasing mass of the salt. Values in D₂O are more negative than those in H₂O. These observations are discussed in terms of the effect of the charged hydrophobic cations on the local solvent structure

[en] The binding of human epidermal growth factor (hEGF), beta-urogastrone, to plasma membranes isolated from rat gastric mucosa was studied to characterize gastric EGF receptors. The binding of [¹²⁵I]hEGF was temperature dependent, reversible, and saturable. A single class of binding sites for EGF with a dissociation constant of 0.42 nM and maximal binding capacity of 42 fmol/mg protein was suggested. There was little change in the binding of [¹²⁵I]hEGF upon addition of peptide hormones (secretin, insulin), antiulcer drugs (cimetidine), or an ulcer-inducing reagent (aspirin). Cross-linking of [¹²⁵I]hEGF to gastric plasma membranes with the use of disuccinimidyl suberate resulted in the labeling of a protein of 150 kDa. These results indicate the presence of EGF receptors on plasma membranes of rat gastric mucosa

[en] The first bipolar operatinal test of an MJ-class pulsed superconducting magnet was successfully carried out in energy transfer experiments between a 3 MJ magnet (load magnet) and a 4 MJ magnet (energy storage magnet) using a chopper-type energy transfer equipment. The test goal was to confirm the technical feasibility of operating an ohmic heating coil for a tokamak-type fusion reactor. A 3 MJ magnet was first charged to 4510 amperes in 1.5 seconds. It was discharged to 0 ampere in 1.5 seconds and at once was re-charged to -4510 amperes in 1.5 seconds. It was again discharged in 1.5 seconds. The maximum field and the stored energy were 5.4 T and 2.1 MJ, respectively. During this bipolar sweep test, the magnet was quite stable during charge. Instability phenomena were not observed when the direction of the current was reversed. We also found that there was no mechanical instability during operation from the results of dynamic strain measurement. Thus it can be concluded that there is no technical problem in the bipolar sweep of an MJ-class pulsed superconducting magnet

[en] It is shown experimentally that acoustic emission (AE) is an effective means of monitoring the operating conditions of superconducting magnets and can be used to prevent catastrophic quenching. The signal-to-noise ratio of AE transducers at liquid helium temperature has been found to be about 18 dB higher than that at room temperature; AE originating from a superconducting magnet and those from the liquid helium shower can be clearly discriminated by observing their wave forms and frequency spectra. These results are also discussed from a theoretical view point based on an elastic medium model for superconducting magnets. (author)

[en] Acoustic emission generated in a composite copper multifilamentary NbTi conductor has been measured. Its source appears to be dissipation associated with the Lorentz force induced flux motions. It is demonstrated that acoustic emission transducers can be used to detect a superconducting-to-normal transition. (author)

[en] Stress vectorcardiography and gated blood pool scan were performed in 23 patients with previous myocardial infarction. These patients were divided into two groups with or without aneurysm. Aneurysm group was divided into three subgroups, that is, apical, anterolateral, and inferior group by the location of aneurysm. Then, we measured the spacial ventricular gradient (S-G) changes and ST elevation induced by exercise. We compared them with gated blood pool scan findings. In patients with aneurysm, S-G vector changes were directed to the location of aneurysm, and in patients without aneurysm, S-G vector changes had no correlation with the location of infarction. And in apical group, exercise-induced ST elevation was supposed to be caused by its abnormal wall motion. (author)

[en] A 10 kVA generator was constructed and tested for the purpose of investigating the performance of superconducting synchronous machines. The machine has an inner rotating field winding and a vertical spindle. In this paper, the design of the field winding, the construction of the machine and the results of test at no load operation are reported. (author)

[en] The reorientational correlation time of benzene molecule in chloroform--benzene mixture was measured by the method of the Raman line shape analysis. The reorientational correlation times thus obtained changed with the mole fraction of chloroform in the mixture owing to the interaction between chloroform and benzene. In addition, the behavior of the isotope structure of the ν₃ band of chloroform and the Raman shifts of the ν₁ band of chloroform in the chloroform--benzene mixture are also reported here

[en] Theoretical models and dust-continuum observation of protoplanetary disks are briefly reviewed. We focus on the thermal structure of the disk, the effect of grain growth and sedimentation on disk structure, and spatial variation of chemical (molecular) abundances. Observations of the gaseous component are reviewed, ranging from UV, optical and infrared emissions to millimeter lines. The former arises mostly from the hot or warm gas in the inner radius (r≤ a few tens of AU), whereas the latter arises from the outer radius. Gas observation can probe the disk structure independently of dust observation. Combining the line and continuum observations is thus very important. Gas observation can also reveal the kinematics, ionization and chemistry in protoplanetary disks

[en] In the practical use of superconducting magnet, regardless of low or high temperature' superconductor, combination of the superconductor and high conductive matrix of normal metal is now indispensable. This binding property is one of the key points whether superconducting characteristics are fully attained or failed prematurely in the practical magnet. But this binding evaluations is not so easy, because even in the mechanical well-jointed conductor in the room temperature, it often appears poor in electric and magnetic property in cryogenic temperature by the contraction of the conductor. And sometimes, these often happen that critical current change time to time of an every trial of current loading. This must be understood that the binding condition between the metals changes by time to time of heating and re-cooling at/after every quench. So it must become very important to evaluate these bindings' properties at cryogenic temperature and with real current charging. Here we report new technique for evaluating these bindings by observing ultrasonic spectra of acoustic emissions when a normal transition is propagated along the superconductor. We have discovered a simple but important fact that good contacting conductor has an emission of this ultra-sound with sharp resonating frequency peak or peaks at around highest spectrum in near 1.0 MHz area