This paper describes a newly developed ejector that uses the inertia of beam buckling deformation, which can eject highly viscous liquids of over 30mPas at room temperature, to be used for fabrication of uniform spherical particles. The ejector is simply a beam consisting of a fluid path and a nozzle located at the approximate center in the longitudinal direction. By applying compression and rotation, the concave bend of the beam gradually changes its shape in the ejecting direction, starting from both longitudinal ends. When this change approaches the center, a sudden reversal buckling occurs and the droplet is separated from the meniscus by the force of the inertia. Adequate conditions for ejecting small droplets of highly viscous liquids were estimated both from the results of experiments and fluid simulations. Requisite inertia was lowered with ease by forming rear-side openings in the fluid path. The authors also demonstrated case examples with the use of an ejector that was experimentally created.

Viscous liquid

Moment of inertia

10.2352/issn.2169-4451.2009.25.1.art00109_1

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Electrically tunable InAs/GaAs QD in a nanocavity with a transfer-printed ITO electrode

Optical Materials Express (2024)

Natthajuks Pholsen Akinari Fujita Masahiro Kakuda Yasuhiko Arakawa Kenji Ikeda

Transfer printing

10.1364/ome.549646

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Prediction of Dynamic Behavior of Ion Conducting Polymer Actuator

The proceedings of the JSME annual meeting (2004)

Masaki FUCHIWAKI Kenji Ikeda Katsuya Nagayama Kazuhiro Tanaka

We have carried out the prediction of dynamic behavior of ion conducting polymer actuator by bondgraph method. The energy flow in the ion conducting polymer actuator was divided into the electrical model and mechanical model by bondgraph and we have carried out the simulation of current and displacement of actuator. Moreover, we have performed the experimental measurement of them under the condition of four cations, such as Li^+, K^+, Na^+, Cs^+. The bondgraph simulation results were in good agreement with the experimental results qualitatively and quantitatively. Furthermore, the qualitative electrical and mechanical characteristics of each ion are clarified by the derived each coefficients of bondgraph.

Electroactive polymers

10.1299/jsmemecjo.2004.6.0_141

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Genotypical classification of hepatitis C virus genome with polymerase chain reaction using a mixed primer set.

Kanzo (1992)

Kazuaki Chayama Yasuji Arase Akihito Tsubota Satoshi Saito Kenji Ikeda

Primer (cosmetics)

10.2957/kanzo.33.805

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Faraday effects of magneto-dielectric nanogranular films with various particle shape

Hanae Kijima-Aoki Kenji Ikeda N. Kobayashi Masato Ohnuma Yoshiki Honda

Magnetic-field control of polarized light via magneto-dielectric nanocomposite system is an important step in seamless implementation of nano-scale magneto-optical device. In this report, magneto-dielectric nanogranular films with "non-sphere shaped" magnetic nanoparticles, wherein (prolate, chained, and oblate)-shaped nanoparticles was investigated regarding to induce the magneto-optical anisotropy. We demonstrate that both optical transmittance and Faraday rotation angle at optical communication bands were successfully improved when the prolate shaped nanoparticle perpendicularly aligned in the film.

Magneto

Faraday cage

Particle (ecology)

10.1109/intermagshortpapers58606.2023.10305022

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Highly accurate thin film sensor using coplanar line

電気学会研究会資料. MAG, マグネティックス研究会 (2012)

Takafumi Kimura Hiromichi Nakano S. Yabukami Tetsuya Ozawa N. Kobayashi

Line (geometry)

Source

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Subspace identification algorithm for stochastic systems equipped with zeros close to unit circle

IFAC-PapersOnLine (2020)

Hideyuki Tanaka Kenji Ikeda

In identifying a stochastic system possessing zeros close to the unit circle, the effect of the initial state appears in the estimates. This paper derives a stochastic subspace identification algorithm for such a system. A new stochastic realization algorithm is developed based on the covariance matrices of the state and the white-noise input, by taking the initial state and positive realness into account. A subspace identification algorithm is obtained by applying the realization algorithm to a finite string of data. Numerical simulation results show that the proposed algorithm provides favorable results compared with the conventional ones.

Realization (probability)

Unit circle

Identification

Minimal realization

10.1016/j.ifacol.2020.12.046

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Modeling Cuttings Lag Distribution in Directional Drilling to Evaluate Depth Resolution of Mud Logging

SPE Drilling & Completion (2020)

Shigemi Naganawa Manabu Suzuki Kenji Ikeda Norihito Inada Ryosuke Sato

Summary In this study, we attempted to model the cuttings lag-depth distribution caused by the dispersion of cuttings transport velocity in directional drilling. From the results of cuttings lag experiments, it was found that the lag distribution could be modeled using the lognormal distribution probability density function (PDF). A simple formulation of lag-depth distribution for the entire depth of a well was mathematically derived. Simulation studies of lag depth for a realistic model of a directional well based on field data were conducted to evaluate depth resolution of mud logging. The key finding is that cuttings sampled at the surface can be contaminated by cuttings originating from other unintended depths to the extent of being non-negligible. This tendency of obscuring the formations and depths from which the sampled cuttings originate is significant if the high inclination or horizontal hole section exceeds a certain length depending on the rate of penetration (ROP). The presented approach has the ability to quantitatively evaluate the uncertainty in the depth resolution of mud logging; this is crucial in improving the lateral quality of reservoir characterization.

Drill cuttings

Cutting

Directional Drilling

Well drilling

Log-normal distribution

10.2118/189615-pa

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High-power AlGaInP visible laser diodes with both multiquantum barrier and strain-induced active layer

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1993)

Kenji Ikeda S. Arimoto M. Aiga

By employing both multi-quantum barrier (MQB) and strained InGaP active layer including strained multi-quantum well (MQW) into a 670 nm region visible (red) laser diode, cw output power of 60 mW in a fundamental transverse mode oscillation even at 100 degree(s)C has been realized.

Oscillation (cell signaling)

Active layer

Barrier layer

Strain (injury)

Transverse mode

10.1117/12.144145

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