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Correlation of mechanical properties with the acoustic properties in case of an experimental white cast iron

IOP Conference Series: Materials Science and engineering 2016年第1期147卷

作者： A Gȋrneţ S Stanciu D Chicet M Axinte V Goanţă Materials Science and Engineering Materials Science Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania Mechanical Engineering Mechatronics and Robotics Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania

The general and traditional opinion regarding the materials used to build bells, musical instruments or sound transmitters is that those materials must be only from the bronze alloyed with tin category. In order to approach this idea from a scientific point of view, the materials with acoustic properties must be analyzed starting from the physical theory and experimental determination that sound travels only through bodies with elastic properties. It has been developed an experimental white cast iron, medium alloyed with Cr and Ni, in order to obtain a material with special acoustic properties. There were determined on specific samples: the vibration damping capacity, the unit energy, the tensile strength and elasticity modulus. These properties were correlated with the properties of other known acoustic materials.

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Corrosion behavior aspects of Ni-base self-fluxing coatings

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IOP Conference Series: Materials Science and engineering 2016年第1期147卷

作者： C Paulin D L Chicet B Istrate M Panţuru C Munteanu Mechanical Engineering Mechatronics and Robotics Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania Materials Science and Engineering Materials Science Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania

Due to the development of thermal spray deposition technologies, thus obtained layers have more applications and fields of use. One of the coatings with increased application is the one produced from Ni-based self-fluxing alloys, which besides the good wear resistance, shows a satisfactory corrosion resistance. In this study it was observed the behavior of three types of coatings produced by Flame Spray method, both at wear and especially corrosion in the environment simulating acid rain. As a result of the experiments it was found that these layers became compact enough after applying the self-fluxing heat treatment, so in their structure are not present defects such as pores and micro-cracks, unmelted particles etc., which could be points of corrosion initiation.

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Cross-cultural study on human-robot greeting interaction: Acceptance and discomfort by Egyptians and Japanese

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Paladyn 2013年第2期4卷

作者： Trovato, Gabriele Zecca, Massimiliano Sessa, Salvatore Jamone, Lorenzo Ham, Jaap Hashimoto, Kenji Takanishi, Atsuo Graduate School of Science and Engineering Waseda University #41-304 17 Kikui-cho Shinjuku-ku Tokyo162-0044 Japan Faculty of Science and Engineering Waseda University Humanoid Robotics Institute Waseda University Japan School of Innovative Design Engineering Mechatronics and Robotic Dept. Egypt-Japan University of Science and Technology Borg El Arab Alexandria21934 Egypt Instituto de Sistemas e Robotica Instituto Superior Tecnico Av. Rovisco Pais 1 Lisbon1049-001 Portugal Department of Innovation Sciences Eindhoven University of Technology P.O. Box 513 5600 MB IPO 1.20 Eindhoven Netherlands Faculty of Science and Engineering Waseda University Japan Waseda University Japan

As witnessed in several behavioural studies, a complex relationship exists between people's cultural background and their general acceptance towards robots. However, very few studies have investigated whether a robot's original language and gesture based on certain culture have an impact on the people of the different cultures. The purpose of this work is to provide experimental evidence which supports the idea that humans may accept more easily a robot that can adapt to their specific culture. Indeed, improving acceptance and reducing discomfort is fundamental for future deployment of robots as assistive, health-care or companion devices into a society. We conducted a Human-Robot Interaction experiment both in Egypt and in Japan. Human subjects were engaged in a simulated video conference with robots that were greeting and speaking either in Arabic or in Japanese. The subjects completed a questionnaire assessing their preferences and their emotional state, while their spontaneous reactions were recorded in different ways. The results suggest that Egyptians prefer the Arabic robot, while they feel a sense of discomfort when interacting with the Japanese robot;the opposite is also true for the Japanese. These findings confirm the importance of the localisation of a robot in order to improve human acceptance during social human-robot interaction. © 2018 De Gruyter Open Ltd. All rights reserved.

关键词： Human robot interaction

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Microstructural aspects at coating-substrate interface for some thermal sprayed layers on valve discs

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IOP Conference Series: Materials Science and engineering 2018年第3期444卷

作者： M Panţuru D L Chicet C Munteanu B Istrate P Avram Mechanical Engineering Mechatronics and Robotics Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania Materials Science and Engineering Materials Science Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania

One of the improvements that can be made to internal combustion engines, without significantly altering the structural elements, is increasing the temperature in the combustion chamber by coating its component elements with thermal barrier coatings (TBC). In this paper were analysed from the microstructure point of view the coating-substrate interfaces of three layers deposited by thermal spraying: S1 - Cr2C3 - NiCr, S2 - MgZrO - NiCr and S3 - ZrO - CaO. The investigations were performed by electronic microscopy on the cross sections taken from the samples after they were subjected to similar heating to the one produced during the operation. It has been observed that all three types of coatings have a much better density, are chemically stable and have good adhesion to the substrate, which recommends them for this type of use.

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Transformer Based Tissue Classification in Robotic Needle Biopsy

arXiv

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arXiv 2024年

作者： Wang, Fanxin Cheng, Yikun Mukherjee, Sudipta S. Bhargava, Rohit Kesavadas, Thenkurussi Department of Mechatronics and Robotics Xi'an Jiaotong-Liverpool University 215123 China Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign ChampaignIL61801 United States Beckman Institute for Advanced Science and Technology Departments of Bioengineering Electrical & Computer Engineering Mechanical Science & Engineering Chemical and Biomolecular Engineering University of Illinois Urbana-Champaign ChampaignIL61801 United States Beckman Institute for Advanced Science and Technology University of Illinois Urbana-Champaign ChampaignIL61801 United States Division of Research and Economic Development University at Albany State University of New York AlbanyNY12222 United States

Image-guided minimally invasive robotic surgery is commonly employed for tasks such as needle biopsies or localized therapies. However, the nonlinear deformation of various tissue types presents difficulties for surgeons in achieving precise needle tip placement, particularly when relying on low-fidelity biopsy imaging systems. In this paper, we introduce a method to classify needle biopsy interventions and identify tissue types based on a comprehensive needle-tissue contact model that incorporates both position and force parameters. We trained a transformer model using a comprehensive dataset collected from a formerly developed robotics platform, which consists of synthetic and porcine tissue from various locations (liver, kidney, heart, belly, hock) marked with interaction phases (pre-puncture, puncture, post-puncture, neutral). This model achieves a significant classification accuracy of 0.93. Our demonstrated method can assist surgeons in identifying transitions to different tissues, aiding surgeons with tissue awareness. © 2024, CC BY.

关键词： Biopsy

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A low voltage, flexible, graphene-based electrothermal heater for wearable electronics and localized heating applications

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Materials Today: Proceedings 2020年 33卷 1840-1844页

作者： Sandra A.N Tembei Amr Hessein Ahmed M.R Fath El-Bab Ahmed A El-Moneim Department of Materials Science and Engineering Egypt-Japan University of Science and Technology New Borg El Arab City Alexandria 21934 Egypt Department of Mathematical and Physical Engineering Faculty of Engineering (Shoubra) Benha University Cairo 11614 Egypt Department of Mechatronics and Robotics Egypt-Japan University of Science and Technology New Borg El Arab City Alexandria 21934 Egypt Graphene Center for Electronic and Energy Applications Egypt Japan University of Science and Technology New Borg El Arab City Alexandria 21934 Egypt Basic and Applied Sciences Institute Egypt-Japan University of Science and Technology New Borg El Arab City Alexandria 21934 Egypt

Recent years have seen a rapid increase in the level of sophistication in modern day devices which has given rise to the demand for better performance in all of their components, one of which is the heating element. Two excellent approaches to this need would be to improve the materials from which these Joule’s heating elements are made and the other to design improved heater geometries for best temperature distribution. In this paper, we discuss a high performance electrothermal heater prepared from laser reduced graphene oxide (LrGO) deposited on Polyethylene Terephthalate (PET) flexible Substrate. The surface morphology and structural properties of the prepared LrGO films were investigated by means of Scanning Electron Microcopy (SEM), X-Ray Diffraction (XRD) and Raman Spectroscopy (RS). Electrothermal (ET) responses of the fabricated electrothermal heaters to different driving DC voltages were studied by Infrared thermal Imagery. An electrothermal heater with a low Sheet resistance of ∼52 O/square was fabricated and it can attained a steady state temperature of up to 135 °C in only 10 s when a low voltage of 9 V was applied. A finite Element model (FEM) was prepared for this heater which agreed well with the experimental results. Power consumption for this heater is as low as 0.389 W/cm 2 , making it a suitable candidate for energy-saving applications such as wearable electronic.

关键词： Flexible electronics Photothermal reduction Graphene oxide Wearable Low voltage Electrothermal heaters

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Novel design of electrical sensing interface for prosthetic limbs using optical micro cavities

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AIP Conference Proceedings 2018年第1期1956卷

作者： Amir R. Ali Mohamed A. Kamel 1Applied-Science & Robotics Laboratory for Applied-Mechatronics (ARAtronics Lab.) Mechatronics Engineering Department German University in Cairo New Cairo 11835 Egypt 2Micro-Sensor Laboratory Mechanical Engineering Department Southern Methodist University Dallas Texas 75275 USA

This paper uses optical whispering galley modes (WGM) cavities to construct a new electrical sensing interface between prosthetic limb and the brain. The sensing element will detect the action potential signal in the neural membrane and the prosthetic limb will be actuated accordingly. The element is a WGM dielectric polymeric cavity. WGM based optical cavities can achieve very high values of sensitivity and quality factor; thus, any minute perturbations in the morphology of the cavity can be captured and measured. The action potential signal will produce an applied external electric field on the dielectric cavity causing it to deform due to the electrostriction effect. The resulting deformation will cause WGM shifts in the transmission spectrum of the cavity. Thus, the action potential or the applied electric field can be measured using these shifts. In this paper the action potential signal will be simulated through the use of a function generator and two metal electrodes. The sensing element will be situated between these electrodes to detect the electrical signal passing through. The achieved sensitivity is 27.5 pm/V in measuring the simulated action potential signal; and 0.32 pm/V.m-1 in measuring the applied electric field due to the passage of the simulated signal.

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Design and analysis of a new bicontact cam mechanism

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IOP Conference Series: Materials Science and engineering 2020年第1期997卷

作者： S Alaci F-C Ciornei F Buium Mechanics and Technologies Department 'Stefan cel Mare' University of Suceava Suceava Romania 'Mechanical Engineering Mechatronics and Robotics Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania

Based on an observation from a previous work, the authors use the degree of passive freedom of a mechanism with roller follower to propose a new type of mechanism. In the new mechanism, the roller is replaced by a jointed element that forms two contacts with the cam. The obtaining of the cam profile is the main disadvantage of the cam mechanisms but in the present work, by using a cam formed by two connected discs, it is aimed to be avoided. The method is illustrated by designing the mechanism in CAD software followed by the simulation of its movement. To optimize the movement of the final element, the equivalent mechanism with lower pairs is used which has the advantage that the lengths of the elements are constant. The kinematics of the final element is particularly sensitive to the variation of the dimensions of the mechanism, fact illustrated by an example.

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The conjugate profile of the circular teeth of a spur gear. Part I: Problem statement

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IOP Conference Series: Materials Science and engineering 2020年第1期997卷

作者： F C Ciornei S Alaci I Doroftei Mechanics and Technologies Department 'Stefan cel Mare' University of Suceava Suceava Romania 'Mechanical Engineering Mechatronics and Robotics Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania

The paper presents the manner of finding the conjugate profile of a circular tooth of a spur gear. A synthesis of the method of enveloping applied to the cam mechanisms is presented in order to relate it the profile of the spur gears. The main argument of employing cam mechanisms is the possibility of obtaining any follower law of motion using a minimum number of parts- the cam and the follower. In the case of the mechanisms with flat face follower, the cam is obtained as an envelope of successive positions of the follower. The gear mechanisms are a particular case of cam mechanisms. The major requirement imposed to this mechanism is to transmit the rotational motion between two shafts with a constant transmission ratio. From here it results that the profile a geared wheel can be completely identified when there are known the distance between the axes, the transmission ratio and the profile of one of the wheels. The most used curve as tooth flank is the involute of a circle, due to the fact that this curve has as conjugate curve an involute, too. Although the involute profiles are common in most of the technical appliances, there are cases when they cannot satisfy the functional constraints of certain devices. As example, in the mechanical watches technology, large transmission ratios are needed and the gears with small number of teeth are used as routine. But this necessity is better fulfilled by cycloidal profiles than the involute ones. The circular profiles for the spur gear are the oldest gears due to the simple profile. The exact conjugate profile of a circular tooth obtained by enveloping by means of dedicated software is presented.

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A model of the effect of dry friction on the behaviour of a dynamical system

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IOP Conference Series: Materials Science and engineering 2020年第1期997卷

作者： F-C Ciornei S Alaci C Bujoreanu Mechanics and Technologies Department 'Stefan cel Mare' University of Suceava Suceava Romania 'Mechanical Engineering Mechatronics and Robotics Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania

A dynamical system with one degree of freedom is modelled in two manners: the first one considers that only the dynamical sliding friction is present and the second considers the presence of both dynamic friction and static friction. It is difficult to apply the model of revealed static friction only for the zero relative velocity. For this reason, an approximate model for the static friction was identified, that accepts that the static friction occurs when the magnitude of relative velocity in contact decreases under a certain value, the critical value. The integration of the equations of motion of the two models reveals that for important values of the relative velocity, the two models estimate the same behaviour of the system. An experimental set-up was used to validate the theoretical results.

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