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  • 1
    Electronic Resource
    Electronic Resource
    Dielectric approach to polystyrene microcapsule analysis and the application to the capsule permeability to potassium chloride (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 513-520 
    Details
    ISSN: 1435-1536
    Keywords: Dielectric property ; dielectric relaxation ; microcapsule ; permittivity ; polystyrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method of numerical analysis is proposed to determine the phase parameters from dielectric observations of polystyrene microcapsules by using the conductivity at intermediate frequencies between two dielectric relaxations observed. The method was more feasible for the analysis of the microcapsule observations than the method by which the calculation is performed by use of the permittivity at lower frequencies. The method was applied to the dielectric observations of the KCl-loaded microcapsules to obtain the permittivity and the conductivity of the capsule interior, the thickness of the capsule wall, the volume fraction of the suspended capsules and the conductivity of the surrounding aqueous phase. The conductivity of capsule interior was found to be unchanged with time for as long as 3 months. From the results it is concluded that the microcapsules are impermeable to KCl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01451514
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  • 2
    Electronic Resource
    Electronic Resource
    A Low Power Dissipation Technique for a Low Voltage OTA (1999)
    Springer
    Analog integrated circuits and signal processing 20 (1999), S. 119-128 
    Details
    ISSN: 1573-1979
    Keywords: analog signal processing ; MOS analog circuit ; MOS OTA ; low voltage power supply ; low power dissipation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper proposes a novel low power dissipation technique for a low voltage OTA. A conventional low power OTA with a class AB input stage is not suitable for a low voltage operation (±1.5 V supply voltages), because it uses composite transistors (referred to CMOS pair) which has a large threshold voltage. On the other hand, the tail-current type OTA needs a large tail-current value to obtain a sufficient input range at the expense of power dissipation. Therefore, the conventional tail-current type OTA has a trade-off between the input range and the power dissipation to the tail-current value. The trade-off can be eliminated by the proposed technique. The technique exploits negative feedback control including a current amplifier and a minimum current selecting circuit. The proposed technique was used on Wang's OTA to create another OTA, named Low Power Wang's OTA. Also, SPICE simulations are used to verify the efficiency of Low Power Wang's OTA. Although the static power of Low Power Wang's OTA is 122 μW, it has a sufficient input range, whereas conventional Wang's OTA needs 703 μW to obtain a sufficient input range. However, we can say that as the input signal gets larger, the power of Low Power Wang's OTA becomes larger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008346312390
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  • 3
    Electronic Resource
    Electronic Resource
    Dielectric study of poly(methyl methacrylate) microcapsules in particular reference to the effect of the frequency dependence of the permittivity of the capsule wall (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 943-950 
    Details
    ISSN: 1435-1536
    Keywords: Dielectric property ; interfacial polarization ; microcapsule ; poly(methylmethacrylate) ; polystyrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dielectric behavior of poly(methyl methacrylate) (PMMA) microcapsules was analyzed theoretically by taking account of the frequency dependence of the relative permittivityɛ s and the electrical conductivityχ s of the capsule wall. For comparison, similar analysis was applied to polystyrene (PS) microcapsules which have frequency-independentɛ s andχ s . The behavior ofɛ s andχ s of the PMMA microcapsules was assumed to be represented by a dielectric relaxation of them-th power type on the basis of dielectric data on underwater PMMA films. By means of a theory of the interfacial polarization, some consideration was carried out regarding the effect of the frequency dependence ofɛ s andχ s on the dielectric behavior of the PMMA microcapsules. The consideration led to predictions that the frequency dependence ofɛ s andχ s causes (i) the variation in the relaxation intensity with the change in the conductivity of suspending medium, (ii) the frequency dependence of the permittivity at low frequencies and (iii) the frequency dependence of the conductivity at high frequencies. The theoretical prediction (i) was verified by observed data, (ii) and (iii) remaining unverified owing to the experimental difficulty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410859
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  • 4
    Electronic Resource
    Electronic Resource
    A CMOS Analog Multiplier Free from Mobility Reduction and Body Effect (2000)
    Springer
    Analog integrated circuits and signal processing 25 (2000), S. 281-290 
    Details
    ISSN: 1573-1979
    Keywords: analog signal processing ; MOS analog circuit ; analog multiplier ; mobility reduction ; body effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper proposes a novel CMOS analog multiplier. As its significant merit, it is free from mobility reduction and body effect. Thus, the proposed multiplier is expected to have good linearity, comparing with conventional multipliers. Four transistors operating in the linear region constitute the input cell of the multiplier. Their sources and backgates are connected to the ground to cancel the body effect. Their gates are fixed to the same bias voltage to remove the effect of the mobility reduction. Input signals are applied to the drains of the input cell transistors through modified nullors. The simulation results show that THD is less than 0.8% for 0.6 Vp-p input signal at 2.5 V supply voltage, and that the 3 dB bandwidth is up to about 13.3 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008377914605
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  • 5
    Electronic Resource
    Electronic Resource
    Low Voltage High-Speed CMOS Square-Law Composite Transistor Cell (2000)
    Springer
    Analog integrated circuits and signal processing 25 (2000), S. 347-350 
    Details
    ISSN: 1573-1979
    Keywords: analog signal processing ; CMOS ; low voltage ; composite transistor ; multiplier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A new low voltage high-speed CMOS composite transistor is presented. It lowers supply voltage down to |V t |+2 V ds,sat and considerably extends input voltage operating range and achieves high speed operation. As an application example, it is used in the design of a high-speed four quadrant analog multiplier. Simulations results using MOSIS 2 μm N-well process with a 3 V supply are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008394318240
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  • 6
    Electronic Resource
    Electronic Resource
    Dielectric observations on polystyrene microcapsules and the theoretical analysis with reference to interfacial polarization (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 381-389 
    Details
    ISSN: 1435-1536
    Keywords: Conductivity ; Dielectric property ; Dielectric relaxation ; Interfacial polarization ; Microcapsule ; Permittivity ; Polystyrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dielectric measurements were carried out for polystyrene microcapsules which were prepared by means of an interfacial polymer deposition technique. The microcapsules showed a couple of dielectric relaxations termedP for lower andQ for higher frequencies. The frequency profiles were characteristic of the structure that shelled spheres were dispersed in a continuous medium. Gelatin aqueous solutions, cationic polyelectrolyte solutions and distilled water were loaded in the capsule interior to examine the effect of conductivities of the constituent aqueous phases on the dielectric properties. Relaxation frequencies of the relaxationsP andQ observed were directly proportional to the conductivities of the continuous medium and of the capsule interior, respectively. A dielectric theory was proposed for a suspension of shelled spheres in a continuous phase in order to analyze the relaxation data observed for the microcapsules. Volume fraction of the capsules, relative permittivity and conductivity of the capsule interior and thickness of the capsule wall are evaluated from the dielectric observations by use of the theoretical formulas derived. The dielectric behavior observed for the polystyrene microcapsules are interpreted quantitatively in terms of the dielectric theory proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418210
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  • 7
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    Pressure suppression of unconventional charge-density-wave state in PrRu_{4}P_{12} studied by optical conductivity (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-05-10
    Description: Author(s): H. Okamura, N. Ohta, A. Takigawa, I. Matsutori, K. Shoji, K. Miyata, M. Matsunami, T. Nanba, H. Sugawara, C. Sekine, I. Shirotani, H. Sato, T. Moriwaki, Y. Ikemoto, Z. Liu, and G. L. Carr Optical conductivity [ σ ( ω ) ] of PrRu 4 P 12 has been studied under high pressure to 14 GPa, at low temperatures to 8 K, and at photon energies 12 meV–1.1 eV. The energy gap in σ ( ω ) at ambient pressure, caused by a metal-insulator transition due to an unconventional charge-density-wave formation at 63 K,... [Phys. Rev. B 85, 205116] Published Wed May 09, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Stability of multinode Dirac semimetals against strong long-range correlations (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-08-22
    Description: Author(s): Akihiko Sekine and Kentaro Nomura We study the stability of Dirac semimetals with N nodes in three spatial dimensions against strong 1/r long-range Coulomb interactions. We particularly study the cases of N=4 and N=16, where the N=4 Dirac semimetal is described by the staggered fermions and the N=16 Dirac semimetal is described by t... [Phys. Rev. B 90, 075137] Published Thu Aug 21, 2014
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Ferromagnetic spin fluctuations in the filled skutterudite ${\mathrm{SrFe}}_{4}{\mathrm{As}}_{12}$ revealed by $^{75}\mathrm{As}$ NMR-NQR measurements (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-11-01
    Description: Author(s): Q.-P. Ding, K. Rana, K. Nishine, Y. Kawamura, J. Hayashi, C. Sekine, and Y. Furukawa As 75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements have been carried out to investigate the magnetic and electronic properties of the filled skutterudite metallic compound SrFe 4 As 12 . The temperature dependence of Knight shift K determined by the NQR spectrum un... [Phys. Rev. B 98, 155149] Published Wed Oct 31, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Strong coupling expansion in a correlated three-dimensional topological insulator (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-01
    Description: Author(s): Akihiko Sekine, Takashi Z. Nakano, Yasufumi Araki, and Kentaro Nomura Motivated by recent studies which show that topological phases may emerge in strongly correlated electron systems, we theoretically study the strong electron correlation effect in a three-dimensional topological insulator, where the effective Hamiltonian can be described by the Wilson fermions. We a... [Phys. Rev. B 87, 165142] Published Tue Apr 30, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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