The Experts below are selected from a list of 495 Experts worldwide ranked by ideXlab platform

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

  • design and evaluation of linear dc motor for Pen Recorder
    IEEE Transactions on Magnetics, 1995
    Co-Authors: Hiroyuki Wakiwaka, Hisashi Yajima, H Yamada, J Oda
    Abstract:

    We designed a Pen Recorder with a linear dc motor (LDM) which has high speed response. The magnetic field of the LDM was analyzed using the finite element method (FEM). We suggest a design method for thin LDMs (e.g. 13 mm thick) with a long stroke (e.g. 100 mm). With this method, we designed an LDM that has a thrust constant of 2.67 N/A. We evaluated LDM designs in terms of mechanical time constants. We simulated the indicial responses of the LDM that was controlled with a displacement feedback controller. We were able to establish that the mechanical time constant is an appropriate evaluation index.

  • evaluation of the thrust constant of a linear dc motor for a Pen Recorder
    Journal of The Magnetics Society of Japan, 1994
    Co-Authors: Hiroyuki Wakiwaka, J Oda, T Ninomiya, T Morimura, H Yamada
    Abstract:

    Pen Recorders with moving-coil-type linear dc motors (LDMs) have already been used in practical applications. However, an optimal design has not yet been established within the dimensional limitations of such devices. This paper provides a guideline for optimum design through characteristic analysis of Pen Recorder units, using a thin, long-stroke LDM. In the LDM, the flux density acting on the coil is equal to the flux density in the gap. The LDM thrust constant consists of N, 1 and B, where N and 1 are known as design values. However, B is determined by the magnetic design. The finite element method (FEM) is used to analyze the three-dimensional magnetic fields of the magnetic circuit, which consists of a permanent magnet and yokes.

H Yamada - One of the best experts on this subject based on the ideXlab platform.

  • design and evaluation of linear dc motor for Pen Recorder
    IEEE Transactions on Magnetics, 1995
    Co-Authors: Hiroyuki Wakiwaka, Hisashi Yajima, H Yamada, J Oda
    Abstract:

    We designed a Pen Recorder with a linear dc motor (LDM) which has high speed response. The magnetic field of the LDM was analyzed using the finite element method (FEM). We suggest a design method for thin LDMs (e.g. 13 mm thick) with a long stroke (e.g. 100 mm). With this method, we designed an LDM that has a thrust constant of 2.67 N/A. We evaluated LDM designs in terms of mechanical time constants. We simulated the indicial responses of the LDM that was controlled with a displacement feedback controller. We were able to establish that the mechanical time constant is an appropriate evaluation index.

  • evaluation of the thrust constant of a linear dc motor for a Pen Recorder
    Journal of The Magnetics Society of Japan, 1994
    Co-Authors: Hiroyuki Wakiwaka, J Oda, T Ninomiya, T Morimura, H Yamada
    Abstract:

    Pen Recorders with moving-coil-type linear dc motors (LDMs) have already been used in practical applications. However, an optimal design has not yet been established within the dimensional limitations of such devices. This paper provides a guideline for optimum design through characteristic analysis of Pen Recorder units, using a thin, long-stroke LDM. In the LDM, the flux density acting on the coil is equal to the flux density in the gap. The LDM thrust constant consists of N, 1 and B, where N and 1 are known as design values. However, B is determined by the magnetic design. The finite element method (FEM) is used to analyze the three-dimensional magnetic fields of the magnetic circuit, which consists of a permanent magnet and yokes.

Hiroyuki Wakiwaka - One of the best experts on this subject based on the ideXlab platform.

  • design and evaluation of linear dc motor for Pen Recorder
    IEEE Transactions on Magnetics, 1995
    Co-Authors: Hiroyuki Wakiwaka, Hisashi Yajima, H Yamada, J Oda
    Abstract:

    We designed a Pen Recorder with a linear dc motor (LDM) which has high speed response. The magnetic field of the LDM was analyzed using the finite element method (FEM). We suggest a design method for thin LDMs (e.g. 13 mm thick) with a long stroke (e.g. 100 mm). With this method, we designed an LDM that has a thrust constant of 2.67 N/A. We evaluated LDM designs in terms of mechanical time constants. We simulated the indicial responses of the LDM that was controlled with a displacement feedback controller. We were able to establish that the mechanical time constant is an appropriate evaluation index.

  • evaluation of the thrust constant of a linear dc motor for a Pen Recorder
    Journal of The Magnetics Society of Japan, 1994
    Co-Authors: Hiroyuki Wakiwaka, J Oda, T Ninomiya, T Morimura, H Yamada
    Abstract:

    Pen Recorders with moving-coil-type linear dc motors (LDMs) have already been used in practical applications. However, an optimal design has not yet been established within the dimensional limitations of such devices. This paper provides a guideline for optimum design through characteristic analysis of Pen Recorder units, using a thin, long-stroke LDM. In the LDM, the flux density acting on the coil is equal to the flux density in the gap. The LDM thrust constant consists of N, 1 and B, where N and 1 are known as design values. However, B is determined by the magnetic design. The finite element method (FEM) is used to analyze the three-dimensional magnetic fields of the magnetic circuit, which consists of a permanent magnet and yokes.

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

  • Cyclic GMP, sodium nitroprusside and sodium azide reduce aqueous humour formation in the isolated arterially perfused pig eye
    Wiley-Blackwell, 2005
    Co-Authors: Shahidullah M, Yap M
    Abstract:

    The effect of nitric oxide (NO) on aqueous humour formation (AHF) and intraocular pressure (IOP) was studied using NO donors, sodium azide (AZ) and sodium nitroprusside (SNP). Using the porcine arterially perfused eye preparation, drug effects on AHF and IOP were measured by fluorescein dilution and manometry, respectively. Perfusion pressure of the ocular vasculature was also monitored using digital pressure transducer and Pen Recorder. L-Arginine (1.0 mM), a precursor of NO, but not D-arginine (1.0 mM), the inactive analogue, produced a significant reduction in AHF (28.5%) and IOP (21.1%). L-NAME (L-nitro-L-arginine) (10-100 μM), an NO synthase inhibitor, had no effect on AHF and IOP. However, L-NAME (100 μM) completely reversed L-arginine's effect. AZ and SNP reduced the AHF and IOP dose-dePendently. AZ at 100 nM, 1 and 10 μM reduced AHF by 26.0, 39.7 and 51.7% and IOP by 10.8, 17.3 and 24.0%, respectively. SNP at 1, 10 and 100 μM reduced the AHF by 6.0, 24.2 and 35.4% and IOP by 3.5, 9.5 and 15.5%, respectively. 8-pCPT-cGMP (8-para-chlorophenyl- thioguanosine-3′,5′-cyclic guanosine monophosphate, 10 μM), a cGMP analogue, also reduced the AHF (34.9%) and IOP (15.9%). The effects of AZ and SNP on the AHF and IOP were blocked by a soluble guanylate cyclase inhibitor ODQ (10 μM), whereas ODQ alone or combined with 8-pCPT-cGMP had no effect on the AHF and IOP. None of the drugs had any significant effect on ocular vasculature. The reduction of the AHF and IOP in the arterially perfused pig eye by nitrovasodilators is likely to involve the NO-cGMP pathway.School of Optometr

To Chi-ho - One of the best experts on this subject based on the ideXlab platform.

  • Cyclic GMP, sodium nitroprusside and sodium azide reduce aqueous humour formation in the isolated arterially perfused pig eye
    2005
    Co-Authors: Shahidullah Mohammad, Yap Maurice, To Chi-ho
    Abstract:

    1. The effect of nitric oxide (NO) on aqueous humour formation (AHF) and intraocular pressure (IOP) was studied using NO donors, sodium azide (AZ) and sodium nitroprusside (SNP). 2. Using the porcine arterially perfused eye preparation, drug effects on AHF and IOP were measured by fluorescein dilution and manometry, respectively. Perfusion pressure of the ocular vasculature was also monitored using digital pressure transducer and Pen Recorder. 3. L-Arginine (1.0 mM), a precursor of NO, but not D-arginine (1.0 mM), the inactive analogue, produced a significant reduction in AHF (28.5%) and IOP (21.1%). L-NAME (L-nitro-L-arginine) (10–100 μM), an NO synthase inhibitor, had no effect on AHF and IOP. However, L-NAME (100 μM) completely reversed L-arginine's effect. 4. AZ and SNP reduced the AHF and IOP dose-dePendently. AZ at 100 nM, 1 and 10 μM reduced AHF by 26.0, 39.7 and 51.7% and IOP by 10.8, 17.3 and 24.0%, respectively. SNP at 1, 10 and 100 μM reduced the AHF by 6.0, 24.2 and 35.4% and IOP by 3.5, 9.5 and 15.5%, respectively. 8-pCPT-cGMP (8-para-chlorophenyl-thioguanosine-3′,5′-cyclic guanosine monophosphate, 10 μM), a cGMP analogue, also reduced the AHF (34.9%) and IOP (15.9%). 5. The effects of AZ and SNP on the AHF and IOP were blocked by a soluble guanylate cyclase inhibitor ODQ (10 μM), whereas ODQ alone or combined with 8-pCPT-cGMP had no effect on the AHF and IOP. 6. None of the drugs had any significant effect on ocular vasculature. 7. The reduction of the AHF and IOP in the arterially perfused pig eye by nitrovasodilators is likely to involve the NO-cGMP pathway