1,021 research outputs found
Conduction Electrohydrodynamics with Mobile Electrodes: A Novel Actuation System for Untethered Robots
No full textElectrohydrodynamics (EHD) refers to the direct conversion of electrical energy into mechanical energy of a fluid. Through the use of mobile electrodes, this principle is exploited in a novel fashion for designing and testing a millimeter-scale untethered robot, which is powered harvesting the energy from an external electric field. The robot is designed as an inverted sail-boat, with the thrust generated on the sail submerged in the liquid. The diffusion constant of the robot is experimentally computed, proving that its movement is not driven by thermal fluctuations, and then its kinematic and dynamic responses are characterized for different applied voltages. The results show the feasibility of using EHD with mobile electrodes for powering untethered robots and provide new evidences for the further development of this actuation system for both mobile robots and compliant actuators in soft robotics
A Retrospective Cohort Study and Mechanism Studies on the Effects of Co-administration of Dexamethasone on Severity of Neutropenia by Methotrexate, Vinblastine,Adriamycin, Cisplatin Combination Chemotherapy.
No full text金沢大学博士（薬学）博士論文 要旨Abstract/本文Full 以下に掲載：Journal of Pharmaceutical Health Care and Sciences 3(3) pp.1-6 2017. Bio Med Central. 共著者：Shingo Itai, Yukio Suga, Yusuke Hara, Kouji Izumi, Yuji Maeda, Yasuhide Kitagawa, Junko Ishizaki, Tsutomu Shimada, Atsushi Mizokami, Yoshimichi Saidoctoral thesi
Supplemental Material, DS1_VET_10.1177_0300985818817024 - Assessment of Human Epidermal Growth Factor Receptor 2 Expression in Canine Urothelial Carcinoma of the Urinary Bladder
No full textSupplemental Material, DS1_VET_10.1177_0300985818817024 for Assessment of Human Epidermal Growth Factor Receptor 2 Expression in Canine Urothelial Carcinoma of the Urinary Bladder by Masaya Tsuboi, Kosei Sakai, Shingo Maeda, James K. Chambers, Tomohiro Yonezawa, Naoaki Matsuki, Kazuyuki Uchida, and Hiroyuki Nakayama in Veterinary Pathology</p
Combined_supplemental_materials-Sakai_et_al - <i>ErbB2</i> Copy Number Aberration in Canine Urothelial Carcinoma Detected by a Digital Polymerase Chain Reaction Assay
No full textCombined_supplemental_materials-Sakai_et_al for ErbB2 Copy Number Aberration in Canine Urothelial Carcinoma Detected by a Digital Polymerase Chain Reaction Assay by Kosei Sakai, Shingo Maeda, Kohei Saeki, Ryohei Yoshitake, Yuko Goto-Koshino, Takayuki Nakagawa, Ryohei Nishimura, Tomohiro Yonezawa and Naoaki Matsuki in Veterinary Pathology</p
Supplemental Material, sj-pdf-1-vet-10.1177_0300985820967449 - BRAF<sup>V595E</sup> Mutation Associates CCL17 Expression and Regulatory T Cell Recruitment in Urothelial Carcinoma of Dogs
No full textSupplemental Material, sj-pdf-1-vet-10.1177_0300985820967449 for BRAFV595E Mutation Associates CCL17 Expression and Regulatory T Cell Recruitment in Urothelial Carcinoma of Dogs by Shingo Maeda, Ryohei Yoshitake, James K. Chambers, Kazuyuki Uchida, Shotaro Eto, Namiko Ikeda, Takayuki Nakagawa, Ryohei Nishimura, Yuko Goto-Koshino, Tomohiro Yonezawa and Yasuyuki Momoi in Veterinary Pathology</p
Active suction cup actuated by ElectroHydroDynamics phenomenon
No full textDesigning and manufacturing actuators using soft materials are among the most important subjects for future robotics. In nature, animals made by soft tissues such as the octopus have attracted the attention of the robotics community in the last years. Suckers (or suction cups) are one of the most important and peculiar organs of the octopus body, giving it the ability to apply high forces on the external environment. The integration of suction cups in soft robots can enhance their ability to manipulate objects and interact with the environment similarly to what the octopus does. However, artificial suction cups are currently actuated using fluid pressure so most of them require external compressors, which will greatly increase the size of the soft robot. In this work, we proposed the use of the ElectroHydroDynamics (EHD) principle to actuate a suction cup. EHD is a fluidic phenomenon coupled with electrochemical reaction that can induce pressure through the application of a high-intensity electric field. We succeeded in developing a suction cup driven by EHD keeping the whole structure extremely simple, fabricated by using a 3D printer and a cutting plotter. We can control the adhesion of the suction cup by controlling the direction of the fluidic flow in our EHD pump. Thanks to a symmetrical arrangement of the electrodes, composed by plates parallel to the direction of the channel, we can change the direction of the flow by changing the sign of the applied voltage. We obtained the pressure of 643 Pa in one unit of EHD pump and pressure of 1428 Pa in five units of EHD pump applying 6 kV. The suction cup actuator was able to hold and release a 2.86 g piece of paper. We propose the soft actuator driven by the EHD pump, and expand the possibility to miniaturize the size of soft robots
Stretchable pumps for soft machines
No full textMachines made of soft materials bridge life sciences and engineering. Advances in soft materials have led to skin-like sensors and muscle-like actuators for soft robots and wearable devices. Flexible or stretchable counterparts of most key mechatronic components have been developed, principally using fluidically driven systems; other reported mechanisms include electrostatic, stimuli-responsive gels and thermally responsive materials such as liquid metals and shape-memory polymers. Despite the widespread use of fluidic actuation, there have been few soft counterparts of pumps or compressors, limiting the portability and autonomy of soft machines. Here we describe a class of soft-matter bidirectional pumps based on charge-injection electrohydrodynamics. These solid-state pumps are flexible, stretchable, modular, scalable, quiet and rapid. By integrating the pump into a glove, we demonstrate wearable active thermal management. Embedding the pump in an inflatable structure produces a self-contained fluidic ‘muscle’. The stretchable pumps have potential uses in wearable laboratory-on-a-chip and microfluidic sensors, thermally active clothing and autonomous soft robots
Printed Paper Robot Driven by Electrostatic Actuator
No full textEffective design and fabrication of 3-D electronic circuits are among the most pressing issues for future engineering. Although a variety of flexible devices have been developed, most of them are still designed two-dimensionally. In this letter, we introduce a novel idea to fabricate a 3-D wiring board. We produced the 3-D wiring board from one desktop inkjet printer by printing conductive pattern and a 2-D pattern to induce self-folding. We printed silver ink onto a paper to realize the conductive trace. Meanwhile, a 3-D structure was constructed with self-folding induced by water-based ink printed from the same printer. The paper with the silver ink self-folds along the printed line. The printed silver ink is sufficiently thin to be flexible. Even if the silver ink is already printed, the paper can self-fold or self-bend to consist the 3-D wiring board. A paper scratch driven robot was developed using this method. The robot traveled 56 mm in 15 s according to the vibration induced by the electrostatic force of the printed electrode. The size of the robot is 30 × 15 × 10 mm. This work proposes a new method to design 3-D wiring board, and shows extended possibilities for printed paper mechatronics
Wireless Electrohydrodynamic Actuators for Propulsion and Positioning of Miniaturized Floating Robots
No full textAutonomous soft robots require compact actuators generating large strokes and high forces. Electro‐fluidic actuators are especially promising, they combine the advantages of electroactive polymers (low‐power consumption, fast response, and electrical powering) with the versatility of fluidic systems (force/stroke amplification). EHD (electrohydrodynamic) actuators are electro‐fluidic actuators whose motion results from charges being induced and accelerated in a liquid. They are extremely compact, silent, and low power (≤10 mW). They have been recently demonstrated in stretchable pumps and for the wireless propulsion of simple floating robots. This study demonstrates simultaneous wireless propulsion (2.5 mm s−1) and control of a 1 cm sized robot using a single DC signal. Voltage is applied between an electrode on the floating robot and a fixed one, both exposed to a dielectric liquid. Results support the underlying physical mechanism as EHD and characterize robot motion with different fluorocarbon liquids and voltages between 400 and 1800 V. Path following is demonstrated with a 3 × 3 array of electrodes. EHD actuators prove to be a simple, compact, low power alternative to magnetic and acoustic actuators for wireless powering and control of miniaturized robots, with applications in precision assembling at the micro/mesoscale, lab‐on‐chip, tactile displays, and active surfaces
Large deformation of self-oscillating polymer gel
No full textA self-oscillating gel is a system that generates an autonomous volume oscillation. This oscillation is powered by the chemical energy of the Belousov-Zhabotinsky (BZ) reaction, which demonstrates metal ion redox oscillation. A self-oscillating gel is composed of Poly-N-isopropylacrylamide (PNIPAAm) with a metal ion. In this study, we found that the displacement of the volume oscillation in a self-oscillating gel could be controlled by its being subjected to a prestraining process. We also revealed the driving mechanism of the self-oscillating gel from the point of view of thermodynamics. We observed that the polymer-solvent interaction parameter. is altered by the redox changes to the metal ion incorporated in the self-oscillating gel. The prestraining process leads to changes in X and changes in enthalpy and entropy when the self-oscillating gel is in a reduced and oxidized state. We found that nonprestrained gel samples oscillate in a poor solution (X > 0.5) and prestrained gel samples oscillate in a good solution (X < 0.5)
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