The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform

Yoshiya Uwatoko - One of the best experts on this subject based on the ideXlab platform.

  • A NiCrAl Pressure Cell up to 4.6 GPa and its application to cuprate and pnictide superconductors
    Journal of Physics: Conference Series, 2014
    Co-Authors: N Fujiwara, Yoshiya Uwatoko, Takehiko Matsumoto
    Abstract:

    A pressurizing trial was performed for a hybrid NiCrAl hybrid Pressure Cell and a Pressure of 4.6 GPa was achieved under a steady load of 15.0 ton, which marks the highest Pressure ever known for a piston-cylinder-type Pressure Cell. The Pressure efficiency at 15.0 ton was 75% and the expansion of the inner diameter of the NiCrAl cylinder partially reached 5%. The Pressure Cell was applied to nuclear-magnetic-resonance experiments on cuprate and pnictide superconductors.

  • Development of Hybrid-Type Pressure Cell for High-Pressure and High-Field ESR Measurement
    Applied Magnetic Resonance, 2013
    Co-Authors: Kohdai Fujimoto, Yoshiya Uwatoko, Takahiro Sakurai, Susumu Okubo, Hitoshi Ohta, Kazuyuki Matsubayashi, Kazutaka Kudo, Yoji Koike
    Abstract:

    A hybrid-type piston-cylinder Pressure Cell for the electron spin resonance (ESR) measurement has been developed. The cylinder of this Pressure Cell consists of a NiCrAl inner cylinder and a CuBe outer sleeve, and all inner parts are made of zirconium oxide which has good transmittance to the millimeter and submillimeter waves. We confirmed that the Pressure reaches 2.1 GPa. We have also developed a transmission-type high-field ESR system having two different modulation methods for this Pressure Cell. A test measurement without Pressure Cell for the two-dimensional orthogonal-dimer spin system of SrCu2(BO3)2 has been done successfully in the wide frequency region. The combination of this electromagnetic wave transmission-type Pressure Cell and this high-field ESR system is a promising tool for the study of the Pressure-induced phase transition of SrCu2(BO3)2.

  • Fabrication of a NiCrAl Pressure Cell and the application to a two-leg ladder compound Sr2Ca12Cu24O41
    Journal of Physics: Conference Series, 2008
    Co-Authors: N Fujiwara, Yoshiya Uwatoko, T Matsumoto, K Koyama-nakazawa, A Hisada, Y Fujimaki, S. Uchida
    Abstract:

    A hybrid NiCrAl Pressure Cell was fabricated to measure magnetic quantities above 3 GPa. A Pressure of 4 GPa was achieved and the Pressure Cell was found to be reusable even after pressurizing trial up to 4GPa. The inner diameter of the cylinder expanded 2.5% at 4 GPa. The Pressure Cell was applied to the 63Cu-NMR measurement at an optimum Pressure of 3.8 GPa in a Pressure-induced superconductor Sr2Ca12Cu24O41.

  • Fabrication and efficiency evaluation of a hybrid NiCrAl Pressure Cell up to 4 GPa
    Review of Scientific Instruments, 2007
    Co-Authors: N Fujiwara, Takehiko Matsumoto, A Hisada, Kazuko Nakazawab, Yoshiya Uwatoko
    Abstract:

    A hybrid NiCrAl Pressure Cell was fabricated to measure magnetic quantities under high Pressure above 3GPa. A Pressure of 4.0GPa was achieved and the Pressure Cell was found to be reusable even after a pressurizing trial up to 4.0GPa. Pressure was monitored using Cu63 nuclear quadrupole resonance of Cu2O and ruby fluorescence. The Pressure efficiency of a fresh Cell was maintained at 96%, and no appreciable deformation was observed at Pressures below 3GPa; on the other hand, the efficiency after pressurizing trials decreased gradually and reached 75% at 4GPa accompanied by a maximum expansion inside the cylinder of 2%.

  • design of 4gpa class hybrid high Pressure Cell for dilution refrigerator
    Physica B-condensed Matter, 2003
    Co-Authors: Yoshiya Uwatoko, Masato Hedo, N Kurita, Masahito Koeda, Melike Abliz, Takehiko Matsumoto
    Abstract:

    Abstract We constructed the piston cylinder type hybrid high Pressure Cell using a home-made Ni–40Cr–3.5Al–0.005B alloy. It was designed in the hydrostatic Pressure Cell; 67 mm in length and 25 mm in outer diameter for using it with dilution refrigerator. We have succeeded in the resistivity measurement under hydrostatic Pressure up to about 3.8 GPa at temperatures down to T=33 mK .

Aki Cellatoglu - One of the best experts on this subject based on the ideXlab platform.

  • Vibrating Cantilever Transducer Incorporated in Dual Diaphragms Structure for Sensing Differential Pneumatic Pressure
    2012
    Co-Authors: Aki Cellatoglu
    Abstract:

    Pneumatic Pressure Cells with thin metallic spherical diaphragm of shallow spherical shell configuration linked with vibrating wire pickup or vibrating cantilever pickup were reported in the past. In order to enhance the sensitivity of the Pressure Cell this work considers dual diaphragm structure fitted with cantilever pickup. The design and development of the Pressure Cell with this dual diaphragm structure having cantilever pickup is presented here. The geometrical design is optimally made as to sense either mono Pressure or differential Pressure resources. The cantilevers of the two diaphragms are excited to produce vibrations and the frequencies of vibrations are determined by picking up signals from orthogonally arranged opto-coupler links. With the computed frequency a lookup table is referred to obtain the Pressure acting on the concerned diaphragm. In the external circuits, the average Pressure and the differential Pressure acting on two diaphragms are computed. Furthermore transmitting circuits taking the average Pressure and differential Pressure in digital form and analogue form to remote area are presented. Performance analysis of the proposed mechatronic Pressure Cell is made and its improved performance over other Pressure Cells is presented. KEYWORDS Cantilever excitation, diaphragm with cantilever, differential Pressure transducer, dual diaphragm Cell, Pressure transmitter 1

  • vibrating cantilever transducer incorporated in dual diaphragms structure for sensing differential pneumatic Pressure
    International Journal of Soft Computing, 2011
    Co-Authors: Aki Cellatoglu, Alasubramania Karuppana
    Abstract:

    Pneumatic Pressure Cells with thin metallic spherical diaphragm of shallow spherical shell configuration linked with vibrating wire pickup or vibrating cantilever pickup were reported in the past. In order to enhance the sensitivity of the Pressure Cell this work considers dual diaphragm structure fitted with cantilever pickup. The design and development of the Pressure Cell with this dual diaphragm structure having cantilever pickup is presented here. The geometrical design is optimally made as to sense either mono Pressure or differential Pressure resources. The cantilevers of the two diaphragms are excited to produce vibrations and the frequencies of vibrations are determined by picking up signals from orthogonally arranged opto-coupler links. With the computed frequency a lookup table is referred to obtain the Pressure acting on the concerned diaphragm. In the external circuits, the average Pressure and the differential Pressure acting on two diaphragms are computed. Furthermore transmitting circuits taking the average Pressure and differential Pressure in digital form and analogue form to remote area are presented. Performance analysis of the proposed mechatronic Pressure Cell is made and its improved performance over other Pressure Cells is presented.

M. V. López - One of the best experts on this subject based on the ideXlab platform.

  • A TDR-Pressure Cell design for measuring the soil-water retention curve
    Soil & Tillage Research, 2008
    Co-Authors: D. Moret-fernández, J.l. Arrúe, V. Pérez, M. V. López
    Abstract:

    Abstract This paper presents a new type of Pressure Cell associated with a zigzag-shaped time domain reflectometry (TDR) probe for determining the soil-water retention ( θ ( ψ )) curve of disturbed thin soil samples. The Pressure Cell, designed for Pressures ranging between 0 and −500 kPa, consisted of a zigzag copper rod (150-mm long, 2 mm in diameter) vertically installed in a clear plastic cylinder (60-mm high, 50 mm in internal diameter) with six vertical copper rods (60-mm long, 2 mm in diameter) arranged around the inner wall of the plastic cylinder. The cylinder was closed at the base with a nylon cloth and placed on a porous ceramic disc. The inner rod and the six-rod grille of the Cell were connected respectively to the inner and outer conductors of a coaxial cable. The results showed that the correlation between the apparent dielectric constant measured with a standard three-rod TDR probe and the zigzag-shaped TDR probe, both immersed in five different non-conductive fluids, was exCellent ( R 2  = 0.99). On the other hand, the volumetric water content measured with the TDR probe of the Pressure Cell filled up with sand, 2-mm sieved loam and clay-loam soils was highly correlated to the corresponding values calculated from the gravimetric water content and the soil bulk density ( R 2  = 0.97; RMSE = 2.32 × 10 −2 ). The parameters of the θ ( ψ ) curves measured for these three different soils with the TDR-Pressure Cell were within the range of values found in the literature. The Cell was also used to study the θ ( ψ ) changes of a 2–4-mm sample of loam soil aggregates after a slow and a fast-wetting process. While negligible changes in both the soil structure and θ ( ψ ) were observed following slow wetting, fast wetting resulted in disintegration of aggregates and drastic changes in the shape of the θ ( ψ ) curve.

M Lopez - One of the best experts on this subject based on the ideXlab platform.

  • A TDR-Pressure Cell design for measuring the soil-water retention curve
    Soil and Tillage Research, 2008
    Co-Authors: D Moretfernandez, J.l. Arrúe, V. Pérez, M Lopez
    Abstract:

    The final version of this article is available at:\ud \ud http://www.sciencedirect.com/science/journal/01671987This paper presents a new type of Pressure Cell associated with a zigzag-shaped time domain reflectometry (TDR) probe for determining the soil-water retention (θ(ψ)) curve of disturbed thin soil samples. The Pressure Cell, designed for Pressures ranging between 0 and −500 kPa, consisted of a zigzag copper rod (150-mm long, 2 mm in diameter) vertically installed in a clear plastic cylinder (60-mm high, 50 mm in internal diameter) with six vertical copper rods (60-mm long, 2 mm in diameter) arranged around the inner wall of the plastic cylinder. The cylinder was closed at the base with a nylon cloth and placed on a porous ceramic disc. The inner rod and the six-rod grille of the Cell were connected respectively to the inner and outer conductors of a coaxial cable. The results showed that the correlation between the apparent dielectric constant measured with a standard three-rod TDR probe and the zigzag-shaped TDR probe, both immersed in five different non-conductive fluids, was exCellent (R2 = 0.99). On the other hand, the volumetric water content measured with the TDR probe of the Pressure Cell filled up with sand, 2-mm sieved loam and clay-loam soils was highly correlated to the corresponding values calculated from the gravimetric water content and the soil bulk density (R2 = 0.97; RMSE = 2.32 × 10−2). The parameters of the θ(ψ) curves measured for these three different soils with the TDR-Pressure Cell were within the range of values found in the literature. The Cell was also used to study the θ(ψ) changes of a 2–4-mm sample of loam soil aggregates after a slow and a fast-wetting process. While negligible changes in both the soil structure and θ(ψ) were observed following slow wetting, fast wetting resulted in disintegration of aggregates and drastic changes in the shape of the θ(ψ) curve.This research was supported by the Comisión Interministerial de Ciencia y Tecnología of Spain (grants AGL2004-07763-C02-02 and AGL2007-66320-CO2-02/AGR) and the European Union (FEDER funds).Peer reviewe

J.l. Arrúe - One of the best experts on this subject based on the ideXlab platform.

  • A TDR-Pressure Cell design for measuring the soil-water retention curve
    Soil & Tillage Research, 2008
    Co-Authors: D. Moret-fernández, J.l. Arrúe, V. Pérez, M. V. López
    Abstract:

    Abstract This paper presents a new type of Pressure Cell associated with a zigzag-shaped time domain reflectometry (TDR) probe for determining the soil-water retention ( θ ( ψ )) curve of disturbed thin soil samples. The Pressure Cell, designed for Pressures ranging between 0 and −500 kPa, consisted of a zigzag copper rod (150-mm long, 2 mm in diameter) vertically installed in a clear plastic cylinder (60-mm high, 50 mm in internal diameter) with six vertical copper rods (60-mm long, 2 mm in diameter) arranged around the inner wall of the plastic cylinder. The cylinder was closed at the base with a nylon cloth and placed on a porous ceramic disc. The inner rod and the six-rod grille of the Cell were connected respectively to the inner and outer conductors of a coaxial cable. The results showed that the correlation between the apparent dielectric constant measured with a standard three-rod TDR probe and the zigzag-shaped TDR probe, both immersed in five different non-conductive fluids, was exCellent ( R 2  = 0.99). On the other hand, the volumetric water content measured with the TDR probe of the Pressure Cell filled up with sand, 2-mm sieved loam and clay-loam soils was highly correlated to the corresponding values calculated from the gravimetric water content and the soil bulk density ( R 2  = 0.97; RMSE = 2.32 × 10 −2 ). The parameters of the θ ( ψ ) curves measured for these three different soils with the TDR-Pressure Cell were within the range of values found in the literature. The Cell was also used to study the θ ( ψ ) changes of a 2–4-mm sample of loam soil aggregates after a slow and a fast-wetting process. While negligible changes in both the soil structure and θ ( ψ ) were observed following slow wetting, fast wetting resulted in disintegration of aggregates and drastic changes in the shape of the θ ( ψ ) curve.

  • A TDR-Pressure Cell design for measuring the soil-water retention curve
    Soil and Tillage Research, 2008
    Co-Authors: D Moretfernandez, J.l. Arrúe, V. Pérez, M Lopez
    Abstract:

    The final version of this article is available at:\ud \ud http://www.sciencedirect.com/science/journal/01671987This paper presents a new type of Pressure Cell associated with a zigzag-shaped time domain reflectometry (TDR) probe for determining the soil-water retention (θ(ψ)) curve of disturbed thin soil samples. The Pressure Cell, designed for Pressures ranging between 0 and −500 kPa, consisted of a zigzag copper rod (150-mm long, 2 mm in diameter) vertically installed in a clear plastic cylinder (60-mm high, 50 mm in internal diameter) with six vertical copper rods (60-mm long, 2 mm in diameter) arranged around the inner wall of the plastic cylinder. The cylinder was closed at the base with a nylon cloth and placed on a porous ceramic disc. The inner rod and the six-rod grille of the Cell were connected respectively to the inner and outer conductors of a coaxial cable. The results showed that the correlation between the apparent dielectric constant measured with a standard three-rod TDR probe and the zigzag-shaped TDR probe, both immersed in five different non-conductive fluids, was exCellent (R2 = 0.99). On the other hand, the volumetric water content measured with the TDR probe of the Pressure Cell filled up with sand, 2-mm sieved loam and clay-loam soils was highly correlated to the corresponding values calculated from the gravimetric water content and the soil bulk density (R2 = 0.97; RMSE = 2.32 × 10−2). The parameters of the θ(ψ) curves measured for these three different soils with the TDR-Pressure Cell were within the range of values found in the literature. The Cell was also used to study the θ(ψ) changes of a 2–4-mm sample of loam soil aggregates after a slow and a fast-wetting process. While negligible changes in both the soil structure and θ(ψ) were observed following slow wetting, fast wetting resulted in disintegration of aggregates and drastic changes in the shape of the θ(ψ) curve.This research was supported by the Comisión Interministerial de Ciencia y Tecnología of Spain (grants AGL2004-07763-C02-02 and AGL2007-66320-CO2-02/AGR) and the European Union (FEDER funds).Peer reviewe