High‐contrast driving method for advanced CEL structure with magnesium oxide single‐crystal powder in ACPDP

Abstract— A new driving method for an advanced‐CEL‐structure panel has been developed. Picture qualities have been upgraded. Discharge time lags are drastically shortened by priming electron emission from magnesium oxide (MgO) single‐crystal powder, refered to as a crystal emissive layer (CEL). The advanced‐CEL‐structure panel has CEL material on the surface of not only the surface‐discharge‐electrode side but also on the address‐electrode side. This panel structure enables a stable opposed discharge when the address electrode functions as a cathode. By utilizing the opposed discharges in the reset and LSB‐SF sustain periods, the dark‐room contrast ratio has been drastically increased to over 20,000:1, which is higher than five times that of the conventional method, and the luminance of the least‐significant‐bit sub‐field (LSB‐SF) is as low as 0.1 cd/m², which is one‐fourth that of the conventional method. The high‐picture‐quality PDP TVs refered to as “KURO” that employs these technologies have been introduced into the marketplace.     

Verification of thermally induced nanometer actuation of magnetic recording transducer to overcome mechanical and magnetic spacing challenges

Protrusion of the recording element during the write process due to Joule heating and eddy-current losses adds a significant constraint in reducing the flying height of sliders found in magnetic recording devices. Variation of the drive temperature also adds similar constraint to the system. One method of overcoming these challenges is to control the relative position of the magnetic recording transducer with respect to the disk surface by thermally heating the transducer region, a concept outlined in a U.S. patent. In this paper, we experimentally show that the thermal actuation concept outlined in the patent can indeed be employed to control the magnetic spacing.     

Reactions of organoboron polymers prepared by hydroboration polymerization

Summary This paper describes a novel methodology for the preparation of poly(ketone). An organoboron polymer was prepared by polyaddition between thexylborane and 1,7-octadiene, which was reacted with potassium cyanide in the presence of trifluoroacetic anhydride. After oxidation of the reaction mixture, the corresponding poly(ketone) was obtained.     

Polyaddition between 2-alkenyl cyclic imino ether and mercaptocarboxylic acid

Summary A new polyaddition reaction between 2-alkenyl cyclic imino ether 1 and mercaptocarboxylic acid 2 was discovered. This polyaddition consists of two steps. The first reaction is the addition of a mercapto group of 2 to an activated carbon-carbon double bond of 1, which takes place at room temperature to produce the adduct 3. The second reaction is an intermolecular reaction between the carboxy group and the cyclic imino ether group with ring-opening which produces poly (amide-thioether-ester) 4.     

Polymerization via zwitterion. 20. Alternating copolymerizations of 2-phenyl-1,3,2-dioxaphospholane with p-and o-formylbenzoic acids

Summary Spontaneous alternating copolymerizations of 2-phenyl-1,3,2-dioxaphospholane (M_N) with p- and with o-formylbenzoic acids (M_E) were examined. The copolymerizations took place without catalysts affording the copolymer 3 via zwitterion 6. The copolymerizations involve the oxidation of the phosphorus monomer and the reduction of formylbenzoic acid. The scheme of the copolymerizations was presented. The yields of copolymers were quite different between these two copolymerizations. With ortho acid, the copolymer yield was low due to producing phthalide 4.     

Cationic polymerization of 5-methyl-2-oxazoline and alkaline hydrolysis of product polymer to linear poly(propylenimine)

Summary A new monomer of 5-methyl-2-oxazoline(5-MeOZO) was prepared. It was found that 5-MeOZO underwent the cationic ring-opening isomerization polymerization to produce poly(N-formylpropylenimine) 1 of waxy or powdery materials. Alkaline hydrolysis of 1 gave linear poly(propylenimine) 2. Polymers 1 and 2 are the same as the respective polymers derived from 4-methyl-2-oxazoline.     

Polymerization via zwitterion. 23. Terpolymerization among 2-phenyl-1,3,2-dioxaphospholane,methyl acrylate,and carbon disulfide

Summary The present paper describes the terpolymerization involving 2-phenyl-1,3,2-dioxaphospholane, methyl acrylate, and carbon disulfide, which took place without any added initiator in benzonitrile or dimethylformamide. The structure and composition of terpolymer were determined by NMR and IR spectra, as well as by elemental analysis. A reaction scheme proceeding via zwitterion was proposed (Eq. 2–5).     

Construction of monoenergetic neutron calibration fields using 45Sc(p, n)45Ti reaction at JAEA

The 8 and 27 keV monoenergetic neutron calibration fields have been developed by using (45)Sc(p, n)(45)Ti reaction. Protons from a 4-MV Pelletron accelerator are used to bombard a thin scandium target evaporated onto a platinum disc. The proton energies are finely adjusted to the resonance to generate the 8 and 27 keV neutrons by applying a high voltage to the target assemblies. The neutron energies were measured using the time-of-flight method with a lithium glass scintillation detector. The neutron fluences at a calibration point located at 50 cm from the target were evaluated using Bonner spheres. A long counter was placed at 2.2 m from the target and at 60 degrees to the direction of the proton beam in order to monitor the fluence at the calibration point. Fluence and dose equivalent rates at the calibration point are sufficient to calibrate many types of the neutron survey metres.     

Development of the detecting method of helium gas leak from canister

In the concrete cask storage system, spent fuel is installed and weld-sealed in a cylindrical container called a canister. The canister is filled with helium gas and its containment shall be maintained and inspected during storage. The helium gas enhances heat removal from spent fuel. When the helium gas leaks, the effect of helium gas convection is weakened in the canister. Thereof, the temperature on the canister surface changes.In present tests, it was found that temperatures of the center of the top and the bottom on the canister surface change remarkably during the helium gas leak. Therefore, we defined the temperature difference as ΔT_BT. And one can detect helium gas leak using the change of ΔT_BT. ΔT_BT increases monotonously toward a constant value during helium gas leak, even if the inlet air temperature drops. The helium gas leak can be detected at the early stage of the leak by observing both ΔT_BT and inlet air temperature.