Showing papers by "National Institute of Advanced Industrial Science and Technology published in 1991"
TL;DR: The cloning of a full-length cDNA encoding rat preproendothelin-1 suggests that ET-1 may play roles as a local mediator in multiple organs both within and outside the cardiovascular system in the rat.
234 citations
73 citations
TL;DR: In this article, an ozone jet generator was constructed with the particular aim of its application for the preparation of superconducting oxide thin films by an MBE (molecular beam epitaxy) method.
Abstract: An ozone jet generator to supply precisely controlled ozone flux to a specimen was constructed with the particular aim of its application for the preparation of superconducting oxide thin films by an MBE (molecular beam epitaxy) method. The ozone jet is supplied to the thin film growth chamber by evaporating the liquid (or solid) ozone accumulated in the ozone vessel of the generator. The necessary condensed ozone is produced from the ozone‐oxygen mixture gas generated by a commercial ozonizer. The ozone flux can be changed by adjusting the temperature of the ozone vessel (i.e., the temperature of liquid ozone). Precise pressure and temperature control of the ozone vessel in liquefying ozone makes it possible to minimize dissolution of diatomic oxygen in the liquid ozone. As a result, the ozone jet generated from the liquid ozone possesses high purity. The precise temperature control also enables a very stable supply of the ozone jet, with a stability of less than 2.5% over 1.5 h. For the experimental con...
60 citations
TL;DR: In this article, a novel method for selective generation of singlemode acoustic waves in multimode media has been developed using a laser beam scanned at the phase velocity of a specified mode.
Abstract: A novel method for selective generation of single‐mode acoustic waves in multimode media has been developed using a laser beam scanned at the phase velocity of a specified mode. In dispersive media, the acoustic frequency can be varied by changing the scanning velocity. The number of carriers in the generated wave packet is proportional to the difference between the phase and the group velocities. These features were experimentally verified in the fundamental symmetric and asymmetric Lamb waves on an aluminum plate generated by a long‐pulse Nd:YAG laser. Applications to anisotropy and thickness measurements are discussed.
54 citations
TL;DR: In this article, the authors describe the development of superconducting generators in Super-GM and the verification of manufacturing techniques using various partial models such as field winding models, multi-cylindrical rotor, damper model, air-gap armature winding, rotating cooling model, and helium transfer coupling.
Abstract: In Japan, the Engineering Research Association for Superconductive Generation Equipment and Materials (Super-GM) has been conducting R&D since FY 1988 on 70-MW class model machines in an effort to realize a 200 MW class pilot machine commissioned as part of the Moonlight Project 'Development of Superconductivity Technology for Application to Power Apparatuses'. The authors describe the recent development of superconducting generators in Super-GM. It is noted that the R&D on superconducting generators by Super-GM which started in FY 1988 is progressing from the research stage of element techniques to the verification of manufacturing techniques using various partial models such as field winding models, multi-cylindrical rotor, damper model, air-gap armature winding, rotating cooling model, and helium transfer coupling. >
39 citations
TL;DR: Ces spectres de resonance paramagnetique electronique permettent une analyse detaillee de l'orientation moleculaire dans le plan dans la limite du substrat.
Abstract: Ces spectres de resonance paramagnetique electronique permettent une analyse detaillee de l'orientation moleculaire dans le plan. Leur dependance vis-a-vis de l'orientation du substrat fournit l'orientation locale des molecules du radical qui presentent un degre d'orientation superieure vers la limite du substrat
36 citations
TL;DR: In this paper, a combination of molecular beam epitaxy and atomic layer epitaxy was used to construct a single quantum well with a half width of 15 to 30 meV. And the authors concluded that the conduction band offset at the ZnSe/ZnS interface is very small (almost zero).
36 citations
TL;DR: In this paper, the quality of ozone vapor produced by a new ozone generator was evaluated, and the ozone vapor was produced by evaporation of liquid ozone after accumulating it in a ozone vessel at various temperatures between 75 and 95 K.
Abstract: The quality of ozone vapor produced with a new ozone generator was evaluated. The ozone vapor was produced by evaporation of liquid ozone after accumulating it in a ozone vessel at various temperatures between 75 and 95 K. Mass analysis of the ozone vapor revealed that the purity of ozone in the vapor depended on both the ozone vessel temperature during liquefaction and that during evaporation. The purity was ∼70% when liquid ozone accumulation temperatures higher than 90 K were used. The activity of the ozone vapor was investigated by oxidation of a Cu foil under low pressure condition. The formation of a CuO layer by exposure to the ozone vapor (pressure: ∼5×10−4 Pa) at 300 °C was confirmed through x‐ray photoelectron spectroscopy analysis.
30 citations
TL;DR: A few protein markers are reported which might serve as useful handles to tease out the molecular events determining mortality/immortality of cultured cells.
Abstract: Fixed mortality of normal somatic cells is a well-estblished fact though the mechanism underlying this universal phenomenon remains unknown. Use of immortal cells in conjunction with their normal mortal counterparts has delineated the dominant genetic nature of the senescent phenotype over immortalization. Although the involvement of proteins in determining the entry/exit/arrest of cells in the cell cycle is evident from the literature, none of them has been confirmed for its role in senescence-associated irreversible cell cycle exit/arrest. The identification of true mortality markers might be possible by selecting a system of natural and conditional aging achieved by the fusion of mortal and spontaneously immoralized cells of the same origin. We report here a few such protein markers which might serve as useful handles to tease out the molecular events determining mortality/immortality of cultured cells.
27 citations
TL;DR: In this article, an H-aggregate with absorption band split was observed in the interface-adsorbed complex Langmuir-Blodgett (LB) films.
Abstract: Interface-adsorbed complex Langmuir-Blodgett (LB) films of arachidic acid and a water-soluble cyanine dye were fabricated using the diffusion-adsorption method. Formation of an H-aggregate with absorption band split was observed in the LB film. This split is assignable as Davydov splitting, which is characterized as the split of the band into two bands, whose transition moments are orthogonal to each other, due to formation of herringbonelike aggregates. The estimation of the molecular arrangement in the aggregate was performed based on Davydov's theory and the extended dipole model.
17 citations
TL;DR: In this paper, the optical properties of the interface-adsorbed complex Langmuir-Blodgett films of arachidic acid and four different derivatives of thiacarbocyanine dyes were examined using a linearly polarized incident.
Abstract: Water‐soluble cyanine dye derivatives can be adsorbed from aqueous solution to an arachidic acid monolayer at the air‐water interface. Interface‐adsorbed complex Langmuir–Blodgett films of arachidic acid and four different derivatives of thiacarbocyanine dyes were fabricated using this method, and their optical properties were examined employing a linearly polarized incident. Clear differences in both spectral shape and in‐plane anisotropy were found among the films of different derivatives, each associated with an aggregate form characteristic of the substituent group. They can be classified as a dimer with Davydov splitting, a monomer, and a J aggregate. Estimation of the configuration of the molecules in the dimers and measurement of the photoluminescence spectrum for the J aggregate were performed to clarify the nature of aggregates. The results suggest the possibility of systematic control of aggregate formation in the system by introducing substituent groups for dyes.
TL;DR: In this article, the tricarbonyl η6-3-methylbenzyl alcohol was resolved to approximately 100% i.e. by lipase-catalyzed transesterifications arranged in homotopic and heterotopic double resolutions.
Abstract: (±)-Tricarbonyl η6-3-methylbenzyl alcohol)chromium
was resolved to
of ∼100%e.e. and
of 92%e.e. by lipase-catalyzed transesterifications arranged in homotopic and heterotopic double resolutions.
01 Dec 1991
TL;DR: In this article, the authors proposed a torque control method for a geared DC motor with the ability to improve the structure stiffness reduced by the torque sensor by using an acceleration controller and positive feedback of the link angle through the inverse dynamics of the acceleration controller.
Abstract: The authors propose a torque control method for a geared DC motor with the ability to improve the structure stiffness reduced by the torque sensor. One of the special features of the proposed method is that it introduces an acceleration controller and positive feedback of the link angle through the inverse dynamics of the acceleration controller. The acceleration controller is realized by a disturbance observer which estimates the total sum of the disturbance torque imposed on a motor axis, and an acceleration controller is necessary for good performance of the positive feedback of the link angle. The effectiveness of the proposed method was demonstrated by experiments using a single axis geared DC motor system with a torque sensor. >
TL;DR: In this article, the structure of carbon layers precipitated on Ni(111) surface by surface segregation was investigated using scanning tunneling microscopy (STM), and it was clarified that the atomic arrangement and electronic structure of the carbon layers were essentially the same as those of the highly oriented pyrolytic graphite (HOPG).
Abstract: The structure of carbon layers precipitated on Ni(111) surface by surface segregation was investigated using scanning tunneling microscopy (STM). As a result of STM observations, it was clarified that the atomic arrangement and electronic structure of the carbon layers were essentially the same as those of the highly oriented pyrolytic graphite (HOPG). And some defect structures which run along 〈1100〉 directions were observed.
TL;DR: Twelve species of optically active metallocene derivatives having a 4‐nitrophenyl group were prepared with horse liver alcohol dehydrogenase‐ or lipase‐catalyzed optical resolution as the key step and the second harmonic generation (SHG) efficiently of these products was measured by the power method using the fundamental light from the Nd:YAG laser.
Abstract: Twelve species of optically active metallocene derivatives having a 4-nitrophenyl group were prepared with horse liver alcohol dehydrogenase- or lipase-catalyzed optical resolution as the key step. The second harmonic generation (SHG) efficiently of these products was measured by the power method using the fundamental light from the Nd:YAG laser. (-)-1- (4-Nitrophenylthio)ethylferrocene (9), (+)-1-(4-nitrophenylthio)ethylruthenocene (16), (+)-1-(4-nitrophenylthio)ethylosmocene (19), (+) -1-(5-nitro-2-pyridylthio)ethylruthenocene (21), and (+) -1-[(4-nitrophenylhydrazono)methyl] -2-methylferrocene (12) showed SHG signals. The highest SHG efficiency was found with (+) -16, being 27 times more intense than the commonly used urea standard.
TL;DR: In this article, the critical current density was estimated from the whole profile of the flux density distribution without using Bean's model, and the estimated value of Jc is about 6X106 A/cm2 at 30 K which is nearly equal to one estimated from magnetization measurements at the same temperature.
Abstract: The flux penetration into superconducting thin films has been observed by means of the magneto-optical Faraday effect in iron garnet (YIG) films. Bi- and Ga-substituted YIG films were used for the observation of the flux density distribution for the YBa2Cu3Ox films formed to disk. We proposed an estimation method of the critical current density Jc from the whole profile of the flux density distribution without using Bean’s model. The estimated value of Jc is about 6X106 A/cm2 at 30 K which is nearly equal to one estimated from the magnetization measurements at the same temperature.
TL;DR: In this paper, the Bethe-Bloch formula was used to deduced mean excitation energies for 10 metallic elements and the magnitude of Barkas correction was extracted from stopping power difference for 4He and 12C ions at the same velocity.
Abstract: Stopping powers of metallic elements have been measured for 55, 65 and 73 MeV protons and for 13 MeV/u 4He and 12C ions using a high resolution magnetic spectrograph. Analyzing experimental data for protons with the Bethe-Bloch formula, we deduced mean excitation energies for 10 metallic elements. The magnitude of Barkas correction was extracted from stopping power difference for 4He and 12C ions at the same velocity, which was found to be consistent with those measured in previous experiments.
TL;DR: In this paper, the one-dimensional temperature moment caused by light absorption and heat diffusion was calculated to explain the basic feature of the photoacoustic signal of bonded Cu plates including an air gap detected by a PZT transducer attached to the back surface of the plate.
Abstract: The piezoelectric photoacoustic spectroscopy of multilayered structures was studied both theoretically and experimentally. We calculated the one-dimensional temperature moment caused by light absorption and heat diffusion. It was found that the temperature moment is able to explain the basic feature of the photoacoustic (PA) signal of bonded Cu plates including an air gap detected by a PZT transducer attached to the back surface of the plate. The phase of the PA signal at low frequencies is very sensitive to the thickness of the air gap between two Cu plates.
TL;DR: In this paper, the inplane anisotropy of the Langmuir-Blodgett films of a merocyanine-fatty acid mixed system has been further studied for two different cases of batch production with the substrates aligned face to face and side by side, respectively, to clarify the limitations of the flow orientation model based on the ideal-fluid approximation.
Abstract: The in‐plane anisotropy of the Langmuir–Blodgett films of a merocyanine‐fatty acid mixed system has been further studied for two different cases of batch production with the substrates aligned face to face and side by side, respectively, to clarify the limitations of the flow‐orientation model based on the ideal‐fluid approximation. For the side‐by‐side case, satisfactory coincidence is found between the model and experiment. The actual dichroic behavior deviates from that predicted for the face‐to‐face case with smaller intersubstrate distances. It was speculated that the stagnation point is associated with anomaly in velocity which is responsible for this discrepancy. In order to examine this, the flow of the monolayer on the water surface during the deposition has been observed using sulphur powder as marker in addition to the optical measurements. The actual flow deviates from that expected from the model and is associated with unsteady motion around the stagnation point as previously speculated. It is indicated that the ideal‐fluid approximation is inappropriate for the face‐to‐face case with smaller distances, leading to the prediction inconsistent with the actual dichroic behavior.
TL;DR: The crystal structure of a mutant ribonuclease T1 (Y45W) complexed with a specific inhibitor, 2'GMP, has been determined by X-ray diffraction and refined at 1.9 A resolution to a conventional R-factor of 0.164.
Abstract: The crystal structure of a mutant ribonuclease T1 (Y45W) complexed with a specific inhibitor, 2'GMP, has been determined by X-ray diffraction and refined at 1.9 A resolution to a conventional R-factor of 0.164. The mode of recognition of the guanine base by the enzyme is similar to that found for the wild-type ribonuclease T1 complexed with 2'GMP. The binding of the guanine base is clearly enhanced by maximum overlapping of the indole ring of Trp45 and the base. The glycosyl torsion angle of the inhibitor is in the syn conformation and the sugar exhibits a C3'-endo type pucker, which differs from that observed in the crystal of the complex between the wild-type ribonuclease T1 and 2'GMP. Analysis of 500-MHZ NMR spectra has also indicated that the 2'GMP molecule as bound to the mutant enzyme in solution exhibits a C3'-endo type pucker, similar to that bound to the wild-type enzyme in solution [Inagaki, Shimada, & Miyazawa (1985) Biochemistry 24, 1013-1020].
TL;DR: In this article, structural distortion of polycrystalline A1N thin films irradiated with He and Ar ions was investigated by means of glancing angle X-ray diffraction experiments.
TL;DR: In this article, Niobium-based superconducting tunnel junctions with a Nb/Al/AlOx/Nb structure have been fabricated in order to study their performance in X-ray detection.
Abstract: Niobium-based superconducting tunnel junctions are expected to be applicable to high-resolution X-ray measurements. Large-sized tunnel junctions with a Nb/Al/AlOx/Nb structure have been fabricated in order to study their performance in X-ray detection. The niobium layer which was sensitive to X-rays had a large size of 100 µm square ×1.2 µm thick. The junction detected 5.9 keV X-rays with an energy resolution of 1 keV. On the basis of the experimental data, the junction parameters were studied to produce a better energy resolution than that of silicon semiconductor detectors. The microstructure of the aluminum layer was observed by means of a transmission electron microscope.
TL;DR: In this paper, the authors measured the minimum yield from RBS-C analysis for 500 keV and 2 MeV Si+, Kr+ and Au+ implanted epitaxial TiN films indicate that the disorder is dependent on damage efficiency.
Abstract: Thin epitaxial TiN films have been deposited on MgO(100) substrate by ion plating technique. Both RHEED and XRD analysis indicate crystalline quality of the film. Ion channeling measurements show that the epitaxial TiN films have comparable minimum yield to that of the substrate. The damage produced in the film and the substrate lattice due to ion implantation have been investigated by the measurement of the increase in χ min in the aligned spectrum. The presence of a sharp interface in the RBS and AES spectrum confirmed the absence of any ion induced mixing. The measured minimum yield from RBS-C analysis for 500 keV and 2 MeV Si+, Kr+ and Au+ implanted epitaxial TiN films indicate that the disorder is dependent on damage efficiency which is a function of ion mass and energy.
TL;DR: The liberation process of metal ions in fatty acid salt LB films soaked in a dilute hydrochloric acid has been studied using X-ray diffraction and IR measurements.
Abstract: The liberation process of metal ions in fatty acid salt LB films soaked in a dilute hydrochloric acid has been studied using X-ray diffraction and IR measurements. The reaction kinetics was found to be described as a pseudomonomolecular reaction. It is suggested that the metal ions, after being liberated from the carboxylate sites, are removed from the film system into the solution.
Proceedings Article•
01 Jan 1991TL;DR: In this paper, the authors proposed a 30kWhWh power allocation scheme based on the energy efficiency of the energy-efficient energy consumption model, where the energy consumption is proportional to the number of users.
Abstract: 水酸化ナトリウム-硝酸ナトリウム系の溶融塩は, 200～300℃で有望な潜熱蓄熱材料である.これまで, 蓄熱器材料と溶融塩との共存性について, 鉄鋼材料の試験片を用いた材料共存性試験および蓄熱容量約30kWhの横型水平U字管式の多パス蓄熱器を用いた実用条件下での共存性試験を行ってきた.本論文では, 蓄熱器内の伝熱に関して, 上記蓄熱器を用いた1000回におよぶ繰り返し蓄・放熱実験により, 蓄熱器の伝熱特性の評価を行った.その結果, 伝熱性能の面も含めて, 本研究で試みた横型水平U字管式で多パス蓄熱器構造の妥当性を確認した.また, 蓄熱器のオーバーオールな伝熱特性の予測, 概念設計のため, 蓄熱器のシミュレーションを行った.上記の蓄熱器をモデル化し, このモデルにより計算を行った結果, 実験データとの良い一致を得た.さらに, 実用規模での蓄熱器についてその伝熱特性の予測を試み, 蓄熱システムの概念設計を行った.