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  • 1
    Online Resource
    Online Resource
    Effect of Intermetal Dielectric Layer On the Interpoly Dielectric Properties of Nonvolatile Memory Devices
    The Electrochemical Society ; 2013
    In:  ECS Meeting Abstracts Vol. MA2013-02, No. 27 ( 2013-10-27), p. 2004-2004
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2013-02, No. 27 ( 2013-10-27), p. 2004-2004
    Abstract: Abstract not Available.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2013-02/27/2004
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2013
    detail.hit.zdb_id: 2438749-6
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  • 2
    Online Resource
    Online Resource
    A New Design Model of an MR Shock Absorber for Aircraft Landing Gear Systems Considering Major and Minor Pressure Losses: Experimental Validation
    MDPI AG ; 2021
    In:  Applied Sciences Vol. 11, No. 17 ( 2021-08-27), p. 7895-
    Details
    In: Applied Sciences, MDPI AG, Vol. 11, No. 17 ( 2021-08-27), p. 7895-
    Abstract: This work presents a novel design model of a magnetorheological (MR) fluid-based shock absorber (MR shock absorber in short) that can be applied to an aircraft landing gear system. When an external force acts on an MR shock absorber, pressure loss occurs at the flow path while resisting the fluid flow. During the flow motion, two pressure losses occur: the major loss, which is proportional to the flow rate, and the minor loss, which is proportional to the square of the flow rate. In general, when an MR shock absorber is designed for low stroke velocity systems such as an automotive suspension system, the consideration of the major loss only for the design model is well satisfied by experimental results. However, when an MR shock absorber is applied to dynamic systems that require high stroke velocity, such as aircraft landing gear systems, the minor loss effect becomes significant to the pressure drop. In this work, a new design model for an MR shock absorber, considering both the major and minor pressure losses, is proposed. After formulating a mathematical design model, a prototype of an MR shock absorber is manufactured based on the design parameters of a lightweight aircraft landing gear system. After establishing a drop test for the MR shock absorber, the results of the pressure drop versus stroke/stroke velocity are investigated at different impact energies. It is shown from comparative evaluation that the proposed design model agrees with the experiment much better than the model that considers only the major pressure loss.
    Type of Medium: Online Resource
    ISSN: 2076-3417
    URL: Article
    DOI: 10.3390/app11177895
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2704225-X
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  • 3
    Online Resource
    Online Resource
    Effect of Intermetal Dielectric Layer On the Interpoly Dielectric Properties of Nonvolatile Memory Devices
    The Electrochemical Society ; 2013
    In:  ECS Transactions Vol. 58, No. 5 ( 2013-08-31), p. 69-73
    Details
    In: ECS Transactions, The Electrochemical Society, Vol. 58, No. 5 ( 2013-08-31), p. 69-73
    Abstract: This paper describes the influence of water-related species contained in intermetal dielectric layer on the interpoly dielectric properties of nonvolatile memory devices. P-TEOS layer used as an intermetal dielectric enhances degradation of interpoly dielectric of nonvolatile memory devices due to the water-related components contained in the layer.
    Type of Medium: Online Resource
    ISSN: 1938-5862 , 1938-6737
    URL: Article
    DOI: 10.1149/05805.0069ecst
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2013
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Linear and Nonlinear Models for Drop Simulation of an Aircraft Landing Gear System with MR Dampers
    MDPI AG ; 2023
    In:  Actuators Vol. 12, No. 7 ( 2023-07-13), p. 287-
    Details
    In: Actuators, MDPI AG, Vol. 12, No. 7 ( 2023-07-13), p. 287-
    Abstract: In this study, our focus is on the drop test simulation of an MR (Magnetorheological) damper-based main landing gear (MRMLG), aiming to explore multi-degree-of-freedom (DOF) dynamic models during aircraft landing. Three different 6-DOF dynamic models are proposed in this work, and their drop performances are compared with results achieved by commercial software. The proposed models include a nonlinear aircraft model (NLAM); a linearized approximated aircraft model (LAAM) linearizing from the nonlinear equations of motion in NLAM; and a fully approximated aircraft model (FAAM) which linearizes the MRMLG’s strut force model. In order to evaluate the drop performance of the aircraft landing gear system with MR dampers, a 7-DOF aircraft model incorporating the nonlinear MRMLG was formulated using RecurDyn. The principal comparative parameters are the coefficient of determination (R2) for the system response of each model with the RecurDyn model and root mean square error (RMSE), which is the ensemble of CG displacement data for each model. In addition, the ensemble of time series data is created for diverse drop scenarios, providing valuable insights into the performance of the proposed drop test models of an aircraft landing gear system featuring MR dampers.
    Type of Medium: Online Resource
    ISSN: 2076-0825
    URL: Article
    DOI: 10.3390/act12070287
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2682469-3
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  • 5
    Online Resource
    Online Resource
    Control of Landing Efficiency of an Aircraft Landing Gear System With Magnetorheological Dampers
    American Institute of Aeronautics and Astronautics (AIAA) ; 2019
    In:  Journal of Aircraft Vol. 56, No. 5 ( 2019-09), p. 1980-1986
    Details
    In: Journal of Aircraft, American Institute of Aeronautics and Astronautics (AIAA), Vol. 56, No. 5 ( 2019-09), p. 1980-1986
    Type of Medium: Online Resource
    ISSN: 1533-3868
    URL: Article
    DOI: 10.2514/1.C035298
    Language: English
    Publisher: American Institute of Aeronautics and Astronautics (AIAA)
    Publication Date: 2019
    detail.hit.zdb_id: 160481-8
    detail.hit.zdb_id: 2025892-6
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  • 6
    Online Resource
    Online Resource
    Work function increase of indium–tin–oxide surfaces by atmospheric air plasma treatment with steady-state airflow
    American Vacuum Society ; 2005
    In:  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Vol. 23, No. 5 ( 2005-09-01), p. 1479-1482
    Details
    In: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 23, No. 5 ( 2005-09-01), p. 1479-1482
    Abstract: Atmospheric air-plasma treatment of indium–tin–oxide (ITO) surfaces has been investigated as an alternative to a conventional oxygen (O2) vacuum plasma process. For this study, we devised an atmospheric air barrier plasma system having a dimension of 1000×600mm2 and successfully verified a possibility to ignite and maintain an atmospheric pressure discharge only in the ambient air. In particular, we used the steady-state airflow to generate more atomic oxygen radicals as oxygen gas during the vacuum plasma process and to prevent redeposition of the removed or transformed impurities onto the indium–tin–oxide substrate. The x-ray photoemission spectroscopy examination indicated that the adoption of the atmospheric-air plasma treatment reduced the surface content of carbon from 22.1% down to 8.5% and increased that of oxygen from 43% up to 57%. According to the photoelectron spectrometer (AC-1, RIKKEN) result, we obtained a work function of 5.11eV for the treated ITO surfaces after 1min treatment time, which is higher than that of 4.87eV for the untreated ITO surface. Consequently, we can effectively remove the carbon contamination and increase the work function of the ITO surface by means of the atmospheric air plasma treatment with steady-state airflow.
    Type of Medium: Online Resource
    ISSN: 0734-2101 , 1520-8559
    URL: Article
    DOI: 10.1116/1.2006137
    RVK:
    UA 4921
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2005
    detail.hit.zdb_id: 1475424-1
    detail.hit.zdb_id: 797704-9
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  • 7
    Online Resource
    Online Resource
    A Study on the Vibration Analysis of a Ball Screw Feed Drive System
    Trans Tech Publications, Ltd. ; 2004
    In:  Materials Science Forum Vol. 471-472 ( 2004-12), p. 149-154
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 471-472 ( 2004-12), p. 149-154
    Abstract: Feed drive system of machine tools may experience serious vibrations or unstable motions during high-speed operation. In this paper, a 6 D.O.F (Degree-Of-Freedom) lumped parameter model was proposed in order to analyze vibrations of a ball screw feed-drive system, which takes planar motion. The equations of motion were derived for the proposed model. Natural frequencies of the system and transient responses due to driving motor speed control input were also analyzed. Experimental modal analysis and operational vibration measurements of a laboratory ball screw feed drive system were made. Both theoretical analysis and experimental measurement results showed good agreement with each other. Consequently we concluded that the proposed 6 D.O.F model could be well applicable to the vibration analysis of a ball screw feed-drive system.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.471-472
    DOI: 10.4028/www.scientific.net/MSF.471-472.149
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2004
    detail.hit.zdb_id: 2047372-2
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  • 8
    Online Resource
    Online Resource
    Occlusion Effect of Dentinal Tubules of the Dentifrice Containing Sodium Metasilicate
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 330-332 ( 2007-2), p. 1429-1432
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 330-332 ( 2007-2), p. 1429-1432
    Abstract: Exposed dentine with patent tubules allows the movement of tubule fluid leading to dentine sensitivity. Occlusion of patent dentinal tubules effectively reduces the state of dentine hypersensitivity. Strontium chloride (SrCl2) has been well known as a component of desensitizing dentifrice. Recently, new dentifrice containing sodium metasilicate was on the market for desensitizing dentifrice. The aim of this in vitro study was to compare the occlusion effect of dentinal tubule between the sodium metasilicate and the existing desensitizing dentifrices. Sixtyfour human dentine specimens were embedded into a Teflon mold and were grinded with the use of silicone carbide papers to expose the surface of dentin. The dentin surface was etched with 37% phosphoric acid for 60 seconds and was treated with ultrasonic washing for 1 hour. The dentifrices used in the study are classified into four groups: G1-dentifrice containing Sodium metasilicate, G2- dentifrice containing Strontium chloride, G3-dentifrice containing Hydroxyapatite and G4-BSI reference dentifrice (control group). Toothpaste slurries were prepared as 20 gram of toothpaste in 80 ml of distilled water. Thirty-two specimens were brushed with the toothpaste slurries using V8 Cross Brushing Machine. Tooth-brushing was performed 5,000 times using a back-and–forth stroke. The pictures of the sizes of dentinal tubules were taken by scanning electron microscopy (×3000) and changes of tubule sizes were analyzed by digital analysis. The results showed that the difference of tubule size in descending order: G1-3.30±1.80, G2-2.82±1.73, G3-1.49±1.14, G4- 1.04±0.94. The dentifrice containing Sodium metasilicate (22.5%) showed the highest dentinal tubule occlusion. Moreover, the dentifrice containing Sodium metasilicate statistically significantly increased occlusion of dentinal tubule as compared to BSI reference dentifrice (p 〈 0.05). Thus, new desensitizing dentifrice containing sodium metasilicate was more effective than existing desensitizing dentifrice on occlusion of dentin tubules.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.330-332
    DOI: 10.4028/www.scientific.net/KEM.330-332.1429
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2007
    detail.hit.zdb_id: 2073306-9
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  • 9
    Online Resource
    Online Resource
    Experimental Validation for the Performance of MR Damper Aircraft Landing Gear
    MDPI AG ; 2021
    In:  Aerospace Vol. 8, No. 9 ( 2021-09-19), p. 272-
    Details
    In: Aerospace, MDPI AG, Vol. 8, No. 9 ( 2021-09-19), p. 272-
    Abstract: The landing gear of an aircraft serves to mitigate the vibration and impact forces transmitted from the ground to the fuselage. This paper addresses magneto-rheological (MR) damper landing gear, which provides high shock absorption efficiency and excellent stability in various landing conditions by adjusting the damping force using external magnetic field intensity. The performance and stability of an MR damper was verified through numerical simulations and drop tests that satisfied aviation regulations for aircraft landing gear. In this study, a prototype MR damper landing gear, a drop test jig, and a two-degree-of-freedom model were developed to verify the performance of the MR damper, with real-time control, for light aircraft landing gear. Two semi-active control algorithms, skyhook control and hybrid control, were applied to the MR damper landing gear. The drop tests were carried out under multiple conditions, and the results were compared with numerical simulations based on the mathematical model. It was experimentally verified that as the shock absorption efficiency increased, the landing gear’s cushioning performance significantly improved by 17.9% over the efficiency achieved with existing passive damping.
    Type of Medium: Online Resource
    ISSN: 2226-4310
    URL: Article
    DOI: 10.3390/aerospace8090272
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2756091-0
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  • 10
    Online Resource
    Online Resource
    Improvement of plasma uniformity using ZnO-coated dielectric barrier discharge in open air
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 89, No. 8 ( 2006-08-21)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 89, No. 8 ( 2006-08-21)
    Abstract: The discharge behavior in atmospheric pressure dielectric barrier discharge using ZnO-coated dielectric layer is examined. ZnO thin film on alumina using rf magnetron sputter causes about a factor of a million higher surface conductivity than bare alumina surface. Experimental result shows that discharge uniformity is improved definitely in the case of ZnO-coated dielectric barrier discharge. Increase of surface conductivity stimulates charges to spread over the dielectric surface widely. These charge spreading enhances the uniformity and the stability of atmospheric pressure discharge in open air by initiation of consecutive streamers.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2338571
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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