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Artykuły w czasopismach na temat „Disc Thickness Variation (DTV)”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 1 lutego 2022

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1

Jacobsson, H. "Disc brake judder considering instantaneous disc thickness and spatial friction variation." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 5 (May 1, 2003): 325–42. http://dx.doi.org/10.1243/095440703321645043.

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Brake judder is a braking-induced vibration. The character of judder is typical of forced vibrations passing through a critical speed. No specific friction characteristic is needed for judder to occur. In two previous models, i.e. a rotor-stator model and a whole vehicle model, the vibration during a brake application was simulated. The vibrations were assumed to be driven by a brake torque variation (BTV) during a wheel revolution. The BTV was assumed to be proportional to the brake pressure variation (BPV) which was measured. Moreover, the proportionality constant was assumed to be independe
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2

Jung, Sung Pil, Hyun Seok Song, Tae Won Park, and Won Sun Chung. "Numerical Analysis of Thermoelastic Instability in Disc Brake System." Applied Mechanics and Materials 110-116 (October 2011): 2780–85. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2780.

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Thermal energy generated by the friction between the disc and pad is transferred to both components and causes thermal expansion of material of each component, and futher affects the friction contact condition. This is the main factor of the thermoelastic instability (TEI) of a disc brake. In this study, TEI is analyzed using the finite element analysis technique. Three dimensional thermo-mechanical analysis model of the disc brake system is created. An intermediate processor based on the staggered approach is used to exchange analysis results: temperature, friction contact power, nodal displa
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3

Febriani, Risky Ayu, Hong-Seok Park, and Chang-Myung Lee. "A Rule-Based System for Quality Control in Brake Disc Production Lines." Applied Sciences 10, no. 18 (September 20, 2020): 6565. http://dx.doi.org/10.3390/app10186565.

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Currently, challenges in quality improvement have driven various enterprises to create quality management systems in smart factories. The development of quality management systems enables quality control for reviewing product quality, identification, and eliminating product failures. However, process adjustment in quality control decisions may be hard to determine when failures are detected. To overcome this problem, an expert system (ES) that applies the failure mode and effects analysis (FMEA) method for developing quality control systems in brake disc production lines is considered. This qu
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4

Kang, Jaeyoung, and Sungjin Choi. "Brake dynamometer model predicting brake torque variation due to disc thickness variation." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 1 (January 2007): 49–55. http://dx.doi.org/10.1243/09544070jauto91.

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5

Gupta, Vandana, and S. B. Singh. "Creep Modeling in a Composite Rotating Disc with Thickness Variation in Presence of Residual Stress." International Journal of Mathematics and Mathematical Sciences 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/924921.

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Steady-state creep response in a rotating disc made of Al-SiC (particle) composite having linearly varying thickness has been carried out using isotropic/anisotropic Hoffman yield criterion and results are compared with those using von Mises yield criterion/Hill's criterion ignoring difference in yield stresses. The steady-state creep behavior has been described by Sherby's creep law. The material parameters characterizing difference in yield stresses have been used from the available experimental results in literature. Stress and strain rate distributions developed due to rotation have been c
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6

Yang, Shang, Hui Qun Yuan, and Yan Li. "Analysis on Mechanical Characteristics of Flexible Membranous Disc Coupling." Advanced Materials Research 655-657 (January 2013): 506–10. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.506.

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Using the basic finite element theory, 3D finite element models of flexible membranous disc coupling with different disc thickness is built by ANSYS ，and then the dynamic characteristics are analyzed in working conditions. In particular, the analysis of static stress and harmonic response to the thickness of 0.85 model is done for getting the stress variation under a rated condition. The date calculated by dynamic characteristics and stress analysis can satisfy the design requirements. Those researches and analysis provide a theoretical consideration for complex vibration situation of flexible
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7

Du, Xinyu, Lichao Mai, Hamed Kazemi, and Hossein Sadjadi. "Fault Detection and Isolation for Brake Rotor Thickness Variation." Annual Conference of the PHM Society 12, no. 1 (November 3, 2020): 8. http://dx.doi.org/10.36001/phmconf.2020.v12i1.1130.

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 Brake rotors are critical parts of the disc braking system for modern vehicles. One common failure for brake rotors is the thickness variation, which may result in unpleasant brake pulsation, vehicle vibration during braking, or eventually lead to the malfunction of the braking system. In order to improve customer satisfaction, vehicle serviceability and availability, it is necessary to develop an onboard fault detection and isolation solution. In our previous work, the vibration features of master cylinder pressure, vehicle longitudinal acceleration and wheel speed were i
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8

Venkatachalam, R., and S. Balasivanandha Prabu. "An Experimental Investigation on the Vibration Responses of a Mild Steel Sandwich Shaft Disc System." Advanced Materials Research 584 (October 2012): 391–95. http://dx.doi.org/10.4028/www.scientific.net/amr.584.391.

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The main aim of this work is to identify the natural frequency of mild steel sandwich shaft disc system. An experimental evaluation is completed to evaluate the natural frequency and damping response of mild steel sandwich shaft disc system using Lab VIEW 8.5 software and National Instrument’s data acquisition (DAQ) system. The validation of the experimental results carried out using ANSYS 13.0, a finite element analysis software package. In addition, the effect of shaft thickness, disc thickness, shaft length variation, second, third, four and five systems also studied. The outcome of the res
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9

Gupta, Vandana, and S. B. Singh. "Effect of anisotropy on creep behavior in a functionally graded material disc of variable thickness." International Journal of Computational Materials Science and Engineering 03, no. 03 (September 2014): 1450017. http://dx.doi.org/10.1142/s2047684114500171.

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In this paper, an effort has been made to study the effect of anisotropy on the steady state creep behavior in the functionally graded material disc with hyperbolic thickness made of Al - SiC (particle). The content of silicon carbide particles in the disc is assumed to decrease linearly from the inner to the outer radius of the disc. The creep behavior of the disc under stresses developing due to rotation at 15,000 rpm has been determined by Sherby's law. The creep parameters of the FGM disc vary along the radial distance due to varying composition and this variation has been estimated by reg
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10

Alexandrova, N. N., and P. M. M. Vila Real. "Elastic-plastic stress distributions and limit angular velocities in rotating hyperbolic annular discs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 2 (February 1, 2007): 137–42. http://dx.doi.org/10.1243/0954406jmes325.

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Plastic analytical stress analysis of a rotating annular disc with its contours being free from the radial pressure and with specifically variable thickness is presented in terms of the Mises-yield criterion and its associated flow rule. The hyperbolic form of thickness variation is considered and optimized towards the maximum rotational speed and favourable stress combinations. Radial and circumferential stress distributions in the disc both in the intermediate elastic-plastic and in the limit plastic states are obtained. As a particular case, limit elastic angular velocity parameter is deriv
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11

Thumm, Armin, Mark Riddell, Bernadette Nanayakkara, Jonathan Harrington, and Roger Meder. "Mapping Within-Stem Variation of Chemical Composition by near Infrared Hyperspectral Imaging." Journal of Near Infrared Spectroscopy 24, no. 6 (January 1, 2016): 605–16. http://dx.doi.org/10.1255/jnirs.1206.

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A near infrared (NIR) imaging spectrograph was used to generate maps of chemical composition distribution on the surface of transverse wood discs taken from tree stems. The measured chemical components were lignin, galactose, glucose and mannose as well as cellulose and hemicelluloses, which were calculated from monomeric sugars. These components were determined using NIR-based chemistry models, which had been developed specifically for the imaging spectrograph. Explained test-set variation for key constituents ranged between 60% (galactan) and 78% (lignin). Day-to-day variability was 1–2% (st
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12

Berg-Johansen, Britta, Misung Han, Aaron J. Fields, Ellen C. Liebenberg, Brandon J. Lim, Peder EZ Larson, Cigdem Gunduz-Demir, Galateia J. Kazakia, Roland Krug, and Jeffrey C. Lotz. "Cartilage Endplate Thickness Variation Measured by Ultrashort Echo-Time MRI Is Associated With Adjacent Disc Degeneration." SPINE 43, no. 10 (May 2018): E592—E600. http://dx.doi.org/10.1097/brs.0000000000002432.

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13

Ocansey, Stephen, Emmanuel Kwasi Abu, Andrew Owusu-Ansah, Shadrack Mensah, John Oduro-Boateng, Rene Abalo Kojo, Samuel Kyei, et al. "Normative Values of Retinal Nerve Fibre Layer Thickness and Optic Nerve Head Parameters and Their Association with Visual Function in an African Population." Journal of Ophthalmology 2020 (February 11, 2020): 1–14. http://dx.doi.org/10.1155/2020/7150673.

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Purpose. To determine normative values of retinal nerve fibre layer thickness (RNFL) and optic nerve head (ONH) parameters and their association with routine clinical tests such as refractive error (RE), stereoacuity (SA), and contrast sensitivity (CS) in an African population. Methods. In a cross-sectional observational study, 100 normal subjects aged 20 to 78 years were evaluated using the Cirrus HD-OCT 5000 and matched with 200 glaucoma patients. Results. Average (±SD) RNFL thickness for normal subjects was found to be 102.37 ± 7.45 (range, 82–119 microns) compared with 90.74 ± 14.50 found
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14

Okamura, Toshikazu. "Interactive Effects of Thermal Deformation and Wear on Lateral Runout and Thickness Variation of Brake Disc Rotors." SAE International Journal of Passenger Cars - Mechanical Systems 9, no. 3 (September 18, 2016): 1214–26. http://dx.doi.org/10.4271/2016-01-1939.

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15

Wang, Qing, Xian Jun Zhou, Zhi Liang Liu, and Hong Jie Bi. "Performance Analysis and Optimization of Flange Bolt Joint under the Influence of Inhomogeneous Temperature Field." Applied Mechanics and Materials 121-126 (October 2011): 1656–62. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.1656.

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A three-dimensional mechanical model and a transcalent model of flange bolt joint were built, considering the nonlinearity of gasket and the contact problem, the effect of inhomogeneous temperature field and its variation to pressure of bolt and gasket was studied, and the joint parameters of two schemes were compared; based on the orthogonal text, two bolt system schemes, adding disc spring and adding sleeve, were experimentally studied. The investigation showed that the sealability of different parts of the gaskets is different, owing to the difference of each bolt in radial and axial displa
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16

Mousa, Mohammed Imran, Zulkurnain Abdul-Malek, and Zainab Imran Mousa. "Leakage Current Based Thermal Modeling of Glass Disc Insulator Surface." Indonesian Journal of Electrical Engineering and Computer Science 6, no. 3 (June 1, 2017): 504. http://dx.doi.org/10.11591/ijeecs.v6.i3.pp504-512.

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The stability of transmission lines relies on the health of the insulators, such as glass string insulators, which may occasionally flashover during an overvoltage. The likelihood of flashover increases notably when the glass insulator is wrapped by a wet contaminant layer. In this paper a study of the surface thermal profile of glass disc insulators insulation had been carried out for both clean and polluted surfaces. A finite-element simulation with time dependent model was carried out using COMSOL Multiphysics software. The variation of the insulator surface temperature with applied voltage
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17

Deng, Zhi Yong, Feng Chong Lan, Wei Huang, Hui Guo, and Pei Huan Chen. "The Research on Thermal-Mechanical Coupled Analysis and the Lightweight Design of Engine Exhaust Valve." Applied Mechanics and Materials 729 (January 2015): 143–48. http://dx.doi.org/10.4028/www.scientific.net/amm.729.143.

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Four types of exhaust valve models are established, the lightweight on engine exhaust valve is designed. The results on thermal mechanical coupled analysis of four exhaust valve models show that: The maximum values of mises stress appear in contact surface between the valve cone and valve seat; Comparing the maximum mises stress, as wall thickness of the hollow valve increases, there are gradual decrease trends in the same positions of the valve cone, the locking groove, neck and end face of the valve disc. The research on the stress distribution of exhaust valves and the variation law between
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18

Guo, F., and P. L. Wong. "An Anomalous Elastohydrodynamic Lubrication Film: Inlet Dimple." Journal of Tribology 127, no. 2 (April 1, 2005): 425–34. http://dx.doi.org/10.1115/1.1866165.

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This paper presents a deliberately designed elastohydrodynamical lubrication (EHL) experiment for the study of the individual effect of the limiting shear stress and wall slippage. Very slow entrainment speeds were employed to avoid influential shear heating and oils of high viscosities were chosen to ensure that the conjunction was under typical EHL. An anomalous EHL film, characterized by a dimple at the inlet region, was obtained. Literature revealed that this inlet dimple was reported in some numerical studies taking into consideration the limiting-shear-stress characteristics of the lubri
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19

To, Naoki, Saulius Juodkazis, and Yoshiaki Nishijima. "Detailed Experiment-Theory Comparison of Mid-Infrared Metasurface Perfect Absorbers." Micromachines 11, no. 4 (April 14, 2020): 409. http://dx.doi.org/10.3390/mi11040409.

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Realisation of a perfect absorber A = 1 with transmittance and reflectance T = R = 0 by a thin metasurface is one of the hot topics in recent nanophotonics prompted by energy harvesting and sensor applications ( A + R + T = 1 is the energy conservation). Here we tested the optical properties of over 400 structures of metal–insulator–metal (MIM) metasurfaces for a range of variation in thickness of insulator, diameter of a disc and intra-disc distance both experimentally and numerically. Conditions of a near perfect absorption A > 95 % with simultaneously occurring anti-reflection property (
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20

Bueno-Gimeno, Inmaculada, Enrique España-Gregori, Andres Gene-Sampedro, Juan Carlos Ondategui-Parra, and Carlos J. Zapata-Rodriguez. "Variations of OCT measurements corrected for the magnification effect according to axial length and refractive error in children." Journal of Innovative Optical Health Sciences 11, no. 01 (November 20, 2017): 1850001. http://dx.doi.org/10.1142/s1793545818500013.

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Purpose: The aim of this paper was to examine the distribution of macular, retinal nerve fiber layer (RNFL) thickness and optic disc parameters of myopic and hyperopic eyes in comparison with emmetropic control eyes and to investigate their variation according to axial length (AL) and spherical equivalent (SE) in healthy children. Methods: This study included 293 pairs of eyes of 293 children (145 boys and 148 girls), ranging in age from 6 to 17 years. Subjects were divided according to SE in control (emmetropia, 99 children), myopia (100 children) and hyperopia (94 children) groups and accord
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21

Das, Bimal, Surajit Kumar Paul, Akhilendra Singh, Kanwer Singh Arora, and Mahadev Shome. "The effect of thickness variation and pre-strain on the cornering fatigue life prediction of a DP600 steel wheel disc." International Journal of Fatigue 139 (October 2020): 105799. http://dx.doi.org/10.1016/j.ijfatigue.2020.105799.

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Wang, Luzhen, and Hailing Kong. "Failure Behavior of Thin Disc Sandstone under Coupled Bending-Seepage Condition." Geofluids 2020 (August 28, 2020): 1–15. http://dx.doi.org/10.1155/2020/8830358.

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A floor aquifuge usually bends and fails when mining above a confined aquifer, which may lead to water inrush disaster. The floor aquifuge was simplified as a thin disc model in this paper, and a series of coupled bending-seepage tests of sandstone were carried out by a patent test system. The variation characteristics of load-displacement, load-time, and permeability-time were analyzed. The deflection and stress in the thin disc rock samples were deduced; the initiation and propagation of cracks were analyzed. The failure behavior of the thin disc rock samples was described. It shows the foll
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23

Kaur, Gurinder, and Nishi Gupta. "Systematic Review Based on the Study of Elastic-Plastic Transition Stresses." Journal of University of Shanghai for Science and Technology 23, no. 07 (July 22, 2021): 1077–84. http://dx.doi.org/10.51201/jusst/21/07269.

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A systematic review based upon the study of elastic-plastic transition stresses. A worthwhile work about the analysis of elastic-plastic transition stresses in different rotating materials by varying different parameters is discussed. In the case of compressible material, the strain rates have a maximum value at the internal surface. It has been observed that radial stress has a higher value at the internal surface of the rotating disc made of incompressible material as compared to circumferential stress with thermal effect and this value of radial stress further increases. With the increase o
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24

Azevedo Cubas, Gloria Beatriz de, Guilherme Brião Camacho, Flávio Fernando Demarco, and Tatiana Pereira-Cenci. "The Effect of Luting Agents and Ceramic Thickness on the Color Variation of Different Ceramics against a Chromatic Background." European Journal of Dentistry 05, no. 03 (July 2011): 245–52. http://dx.doi.org/10.1055/s-0039-1698888.

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ABSTRACTObjectives: The aim of this study was to assess the influence of various ceramic thicknesses and luting agents on color variation in five ceramic systems. Methods: Fifteen disc-shaped ceramic specimens (11 mm diameter; shade A3) were fabricated with each of the six veneering ceramics tested, with 1, 1.5, or 2 mm thickness (n=5). Resin composite discs (Z-250, shade C4) were used as bases to simulate a chromatic background. The cementation of the veneers was carried out with an opaque resin-based cement (Enforce, shade C4), a resin-based cement (Enforce, shade A3), or without cement (C4,
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25

Prajapati, Deepak K., and Mayank Tiwari. "Use of Artificial Neural Network (ANN) to Determining Surface Parameters, Friction and Wear during Pin-on-Disc Tribotesting." Key Engineering Materials 739 (June 2017): 87–95. http://dx.doi.org/10.4028/www.scientific.net/kem.739.87.

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In tribological analysis of machine elements (such as gears, ball/roller bearings etc.), surface roughness plays very important role, ultimately it affects the friction coefficient, wear, rolling contact fatigue (micro pitting) and other failure mechanisms. Surface geometry and topography changes with time (number of cycles) during rolling/sliding motion of contacting surfaces. So, it is important to show the variation of surface topography parameter during wear process. This work presents the evolution of roughness parameters, wear and friction coefficient during pin-on-disc tribotesting unde
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26

Uno, Y., H. Imai, K. Shinano, H.-H. Qiao, J. R. Dawson, S. L. Breen, and J. F. Gómez. "Modelled 3D distribution of OH/IR stars in the Galactic disc." Monthly Notices of the Royal Astronomical Society 502, no. 2 (January 22, 2021): 3012–20. http://dx.doi.org/10.1093/mnras/stab176.

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ABSTRACT We have modelled the 3D distribution of OH/IR stars in the Galactic plane, traced by 1612 MHz OH maser sources with classic double horned spectral profiles. We statistically analysed over 700 maser sources detected by the HI/OH/Recombination line survey of the Milky Way (THOR) and the Australia Telescope Compact Array interferometric follow-up observations of the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH). With a simple model constructed from a classical density distribution of stars and luminosity functions of OH maser sources in the Galaxy, we estimate the scale height,
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27

Mandal, Sandip, and D. V. Khakhar. "Granular surface flow on an asymmetric conical heap." Journal of Fluid Mechanics 865 (February 18, 2019): 41–59. http://dx.doi.org/10.1017/jfm.2019.26.

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We carry out an experimental study of the granular surface flow of nearly monodisperse glass beads on a conical heap formed on a rough circular disc by a narrow stream of the particles from a hopper, with the pouring point displaced from the centre of the disc. During the growth phase, an axisymmetric heap is formed, which grows either by periodic avalanches or by non-periodic avalanches that occur randomly over the azimuthal location of the heap, depending on the operating conditions and system properties. The dynamics of heap growth is characterized by the variation of the heap height, angle
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Jiang, Lan, Yanli Jiang, Liang Yu, Hongliang Yang, Zishen Li, and Youdong Ding. "Thermo-Mechanical Coupling Analyses for Al Alloy Brake Discs with Al2O3-SiC(3D)/Al Alloy Composite Wear-Resisting Surface Layer for High-Speed Trains." Materials 12, no. 19 (September 27, 2019): 3155. http://dx.doi.org/10.3390/ma12193155.

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In the present work, a theoretical model of three-dimensional (3D) transient temperature field for Al alloy brake discs with Al2O3-SiC(3D)/Al alloy wear-resisting surface layer was established. 3D transient thermo-stress coupling finite element (FE) and computational fluid dynamic (CFD) models of the brake discs was presented. The variation regularities of transient temperature and internal temperature gradient of the brake discs under different emergency braking conditions were obtained. The effects of initial braking velocity (IBV) and thickness of Al2O3-SiC(3D)/Al alloy composite wear-resis
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Nam, Ki Yup, Bum Jun Kim, Woo Hyuk Lee, and Yong Seop Han. "Repeatability of Spectral Domain Optical Coherence Tomography Measurements of Bruch’s Membrane Opening-Minimum Rim Width in Epiretinal Membrane Patients with Peripapillary Involvement." Journal of Clinical Medicine 10, no. 11 (May 21, 2021): 2240. http://dx.doi.org/10.3390/jcm10112240.

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The Bruch’s membrane opening-minimum rim width (BMO-MRW) is a recently introduced parameter of the neuroretinal rim. We analyzed the repeatability of spectral-domain optical coherence tomography (SD-OCT) measurements of BMO-MRW in epiretinal membrane (ERM) patients with peripapillary involvement, since the surface around the optic disc is distorted in such patients. BMO-MRW and retinal nerve fiber layer (RNFL) thickness measurements were performed using SD-OCT in prospectively enrolled ERM patients and age-matched healthy control individuals. After two consecutive measurements with a 5 min int
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Hakobyan, V. N., H. A. Amirjanyan, and K. Ye Kazakov. "Axisymmetric Stressed State of Uniformly Layered Space with Periodic Systems of Internal Disc-Shaped Cracks and Inclusions." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (89) (April 2020): 25–40. http://dx.doi.org/10.18698/1812-3368-2020-2-25-40.

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Using the Hankel integral transform, we construct discontinuous solutions for the problem of the axisymmetric stress state of a piecewise homogeneous, uniformly layered space, obtained by alternately connecting two heterogeneous layers of the same thickness. The space on the middle planes of the first heterogeneous layer contains a periodic system of circular disc-shaped parallel cracks, and on the middle planes of the second layer has a periodic system of circular disc-shaped parallel rigid inclusions. The determining system of equations is obtained in the form of a system of integral equatio
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Strashnov, Stanislav, Sergei Alexandrov, and Lihui Lang. "Description of Residual Stress and Strain Fields in FGM Hollow Disc Subject to External Pressure." Materials 12, no. 3 (January 31, 2019): 440. http://dx.doi.org/10.3390/ma12030440.

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Elastic/plastic stress and strain fields are obtained in a functionally graded annular disc of constant thickness subject to external pressure, followed by unloading. The elastic modulus and tensile yield stress of the disc are assumed to vary along the radius whereas the Poisson’s ratio is kept constant. The flow theory of plasticity is employed. However, it is shown that the equations of the associated flow rule, which are originally written in terms of plastic strain rate, can be integrated with respect to the time giving the corresponding equations in terms of plastic strain. This feature
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32

Xu, Xinfu, and Hermann Winner. "Transfer behaviours and influences of high-order hot judder in passenger cars." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, no. 3 (May 7, 2017): 400–417. http://dx.doi.org/10.1177/0954407017702995.

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Hot judder consists of brake-induced forced vibrations which are characterized by hot spots on the brake discs. It mainly influences the driving comfort as perceived by the driver as vibrations and low-frequency noises. This article concentrates on the transfer behaviours of high-order hot judder and its effects on the driver’s subjective perception. A novel testing method is applied in this investigation, simulating the high-order hot judder by using discs that are artificially modified to generate tenth-order disc thickness variations or tenth-order lateral run-out. A high quality is achieve
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33

Wang, Gang, Xin Xin Ma, Guang Ze Tang, Yong Liu, Shi Yu He, and De Zhuang Yang. "Tribological Behaviors at High Load of MoSX/Au Films in Vacuum." Advanced Materials Research 150-151 (October 2010): 800–804. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.800.

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MoSx/Au films about 1μm in thickness were deposited on 9Cr18 steel substrate discs by magnetron sputtering method. The chemical composition and chemical states of the as-deposited films were determined by X-ray photoelectron spectroscopy (XPS). The effect of high loads (15~50N) on tribological behaviors of the MoSx/Au films in vacuum was studied by pin-disc wear tests. The pins were made of 2Cr13 steel. The morphologies of as-deposited films and wear track were observed by scanning electron microscopy (SEM). The results show the friction coefficient and the wear life of the films decrease with
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Kim, Min-Su, Hyung-Bin Lim, Woo-Hyuk Lee, Yeo-Kyoung Won, Ki-Yup Nam, and Jung-Yeul Kim. "Wide-Field Swept-Source OCT Analysis of Interocular Symmetry of Choroidal Thickness in Subjects with Uncomplicated Pachychoroid." Journal of Clinical Medicine 10, no. 18 (September 19, 2021): 4253. http://dx.doi.org/10.3390/jcm10184253.

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Background: We aimed to study the bilateral choroidal thickness (CT) symmetry and difference in uncomplicated pachychoroid subjects using wide-field swept-source optical coherence tomography (SS-OCT). Methods: All subjects underwent a wide-field 16-mm one-line scan using SS-OCT. Bilateral CT was measured at, and compared among, the following 12 points: three points at 900-µm intervals from the nasal optic disc margin (nasal peripapillary area), one point at the subfovea, six points at 900-µm intervals from the fovea to the nasal and temporal areas (macular area), and two peripheral points 5400
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35

Poll, GWG, and D. Wang. "Fluid rheology, traction/creep relationships and friction in machine elements with rolling contacts." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 226, no. 6 (January 25, 2012): 481–500. http://dx.doi.org/10.1177/1350650111431790.

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The correct prediction of shear stresses in lubricants applied to concentrated rolling/sliding contacts has been an issue of intense debate for many years. Traction testers of various kinds such as two-disc roller rigs or ball on disc apparatus have been extensively used in order to obtain experimental data, as well as, more recently, molecular dynamics simulations. Several, partly competing, phenomenological models have been developed to describe the dependence of shear stresses on various parameters. Evidently, the importance lies in the need to predict and reduce friction, or, more accurate
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36

Oswald, Walter, Jan Lauk, Lutz Gödeke, Peter Ehrhard, and Norbert Willenbacher. "Analysis of Paint Flow Pulsations during High-Speed Rotary Bell Atomization." Coatings 9, no. 10 (October 17, 2019): 674. http://dx.doi.org/10.3390/coatings9100674.

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High-speed rotary bell atomization is the preeminent coating technique in the automotive industry. It is widely accepted that a narrow droplet size distribution and constant spray are necessary in order to guarantee uniform film thickness and high-quality appearance. This may be deteriorated by paint flow pulsations. So far, however, no studies exist regarding such fluctuations quantitatively for this type of atomizers. We fill this gap using image analysis of high-speed recordings close to the bell edge. We could show that the fundamental pulsation frequency increases linearly with rotational
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37

Huang, Xiaomao, Shun Zhang, Chengming Luo, Wencheng Li, and Yitao Liao. "Design and Experimentation of an Aerial Seeding System for Rapeseed Based on an Air-Assisted Centralized Metering Device and a Multi-Rotor Crop Protection UAV." Applied Sciences 10, no. 24 (December 10, 2020): 8854. http://dx.doi.org/10.3390/app10248854.

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To improve the overall mechanization level of rapeseed production in China, especially in some hilly regions where ground machinery cannot enter the fields or can only enter with very low economic benefits, a special aerial seeding system for rapeseed based on a miniature air-assisted centralized metering device was designed and tested in this study. Unlike existing commercial aerial seeding systems, the proposed seed meter was a miniaturized version derived from the traditional air-feeding seed meter on ground planters. The new version contained a redesigned seed feeding component to overcome
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38

Sutcliffe, M. P. F. "Traction Measurements in Mixed Elastohydrodynamic Lubrication with a Controlled Circumferential Roughness." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 205, no. 4 (July 1991): 265–73. http://dx.doi.org/10.1243/pime_proc_1991_205_118_02.

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The transition between smooth elastohydrodynamics (EHL) and micro-EHL is investigated. Traction measurements in a disc machine with a controlled circumferential roughness are used to infer film thicknesses under the asperity tops. These are then compared with hydrodynamic theory. At the two extremes where there is little pressure rippling between the asperity tops and the adjoining valleys or where there is little pressure in the valleys the theoretical and experimentally inferred films are in reasonable agreement. In the transition region the experimentally deduced films are not reliable. Tra
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Junmahasathien, Taepin, Pattaraporn Panraksa, Paytaai Protiarn, Doosadee Hormdee, Rajda Noisombut, Nutthapong Kantrong, and Pensak Jantrawut. "Preparation and Evaluation of Metronidazole-Loaded Pectin Films for Potentially Targeting a Microbial Infection Associated with Periodontal Disease." Polymers 10, no. 9 (September 13, 2018): 1021. http://dx.doi.org/10.3390/polym10091021.

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The objective of this study was to develop the metronidazole loaded high and low methoxyl pectin films (HM-G-MZ and LM-G-MZ) for the treatment of periodontal disease. The films were prepared by pectin 3% w/v, glycerin 40% w/v, and metronidazole 5% w/v. The developed films were characterized by scanning electron microscope and evaluated for thickness, weight variation, and elasticity. The developed films showing optimal mechanical properties were selected to evaluate radial swelling properties, in vitro release of metronidazole and the antimicrobial activity against Porphyromonas gingivalis and
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40

Arakere, N. K., and C. Nataraj. "Vibration of High-Speed Spur Gear Webs." Journal of Vibration and Acoustics 120, no. 3 (July 1, 1998): 791–800. http://dx.doi.org/10.1115/1.2893899.

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High cycle fatigue loading of gear webs due to in-plane stresses, caused by forced excitation resulting from centrifugal loading and dynamic tooth loads, has been known to cause radial fatigue cracks. This is especially prevalent in high-speed gears used in aerospace applications, with small web thickness, for weight reduction. Radial cracks have also been observed to originate at the outer edge of lightening holes machined in gear webs for weight reduction. This paper presents an analytical treatment of the in-plane vibration of high-speed gear webs resulting from rotational effects and perio
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41

Rusu, Marius, Kathrin Mörseburg, Øyvind Gregersen, Asuka Yamakawa, and Sari Liukkonen. "Relation between fibre flexibility and cross-sectional properties." BioResources 6, no. 1 (January 10, 2011): 641–55. http://dx.doi.org/10.15376/biores.6.1.641-655.

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The correlation between the fibre flexibility and cross-sectional area moment of inertia of thermomechanical pulp fibres was investigated. The main effects of refining were found to be internal fibrillation, external fibrillation, and fibre shortening. Internal fibrillation increases fibre flexibility and fibre collapsibility, improving fibre-to-fibre contact in a paper sheet. The raw materials used were pulps produced from six different Norway spruce logs and six different Scots pine logs, chosen in a manner that allowed variation of fibre wall thickness and fibril angle independently. Each w
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42

Kazemi, Hamed, Xinyu Du, Samba Drame, Regan Dixon, and Hossein Sadjadi. "Prognostics Model to Predict Brake Rotor Thickness Variation." Annual Conference of the PHM Society 11, no. 1 (September 22, 2019). http://dx.doi.org/10.36001/phmconf.2019.v11i1.796.

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Brake rotor thickness variation causes brake torque variation which can lead to brake judder and pulsation, steering wheel oscillations and chassis vibration. In this paper, we have proposed a prognostics methodology to predict the degradation level of brake rotor due to disc thickness variation. Leveraging the time and frequency domain analysis, this model creates health indicators to assess the health of the rotor and predict the rotor thickness variations of 36 micrometers or more. These health indicators that are calculated during braking events include: (i) envelope or variance of the bra
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43

Magalhães, Tarquinio Mateus. "Effects of site and tree size on wood density and bark properties of Lebombo ironwood (Androstachys johnsonii Prain)." New Zealand Journal of Forestry Science 51 (April 14, 2021). http://dx.doi.org/10.33494/nzjfs512021x32x.

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Background: Wood and bark are important renewable natural resources. Density is an important property that is used to describe wood and bark quality for a number of end uses. However, wood and bark density, bark proportion and dimensions vary with age and site, as well as among and within trees. The aim of this study was to investigate the effect of site, diameter class, and vertical position within the stem on the density of wood and bark, bark volume, bark dry-mass and thickness of Lebombo ironwood (Androstachys johnsonii Prain). Methods: The study was conducted on 93 Lemombo ironwood trees
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44

Kurtul, Bengi Ece, Ayşe İdil Çakmak, Ahmet Elbeyli, Abdulkerim Karaaslan, and Çiğdem El. "Association of childhood obesity with retinal microvasculature and corneal endothelial cell morphology." Journal of Pediatric Endocrinology and Metabolism, December 10, 2020. http://dx.doi.org/10.1515/jpem-2020-0483.

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AbstractObjectivesTo investigate the optical coherence tomography angiography (OCTA) and specular microscopy (SM) findings in obese children and compare them with healthy ones.Methodsthis prospective study, 50 eyes of 25 obese children [body mass index (BMI) ≥95th percentile], 36 eyes of 18 control age- and sex- matched healthy subjects (BMI <85th percentile) were included. Demographic features and ophthalmological examination including OCTA measurements as well as SM findings were assessed. Cellular morphology was observed by noncontact SM and results for corneal endothelial cell density (
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45

Jin, Xuyang, Jing Wang, Yiming Han, Nannan Sun, and Jianrong Zhu. "Discrepancy in oil film distribution observed in ZEV reciprocating motion." Industrial Lubrication and Tribology ahead-of-print, ahead-of-print (September 25, 2020). http://dx.doi.org/10.1108/ilt-01-2020-0021.

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Purpose This study aims to present the discrepancy in oil film distribution in reciprocating motion experimentally with zero entraining velocity (ZEV) on a conventional ball-disk test rig with oil lubrication. Design/methodology/approach Driven independently by two individual servomotors, a steel ball and a sapphire disc move at equal speed but in opposite directions in a triangle wave. The oil film images between the ball and the disc were recorded by a camera. After the experiments, the mid-section film thickness was evaluated by using a dichromatic interference intensity modulation approach
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46

Cardenas-Flechas, Leydi Julieta, Claudia Patricia Mejía-Villagran, Miryam Rincon-Joya, and Jhon Jairo Olaya-Florez. "Synthesis of nanostructured (Ti-Zr-Si)N coatings deposited on Ti6Al4V alloy." Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales, May 19, 2021. http://dx.doi.org/10.18257/raccefyn.1198.

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d Zr targets. The synthesis of the coatings was carried out by varying the discharge power in the Ti5 well as a variation in the deposit temperature at room temperature 130° and 260°C. The coatings were characterized by means of X-ray diffraction (XRD), evidencing the formation of the phase that belongs to the solid solution (Zr, Ti)N, scanning electron microscopy (SEM), UV-Vis spectroscopy and hardness and pin-on-disc tests. The thickness was measured through interferometry with values between 662 and 481nm for the deposited coatings. According to the failure mechanism in the scratch test, th
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47

Lyu, Hanyi, Qiuying Chen, Guangyi Hu, Ya Shi, Luyao Ye, Yao Yin, Ying Fan, et al. "Characteristics of Fundal Changes in Fundus Tessellation in Young Adults." Frontiers in Medicine 8 (April 26, 2021). http://dx.doi.org/10.3389/fmed.2021.616249.

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Purpose: To explore the characteristics and associated factors of fundus tessellation, especially the alternation of choroidal thickness among different degrees of tessellated fundus in young adults.Design: Cross-sectional, population-based study.Methods: A total of 796 students were included in the study and underwent comprehensive ophthalmic examinations, including anterior segment examinations and swept-source optical coherence tomography (OCT) measurements. The degree of tessellated fundus was assessed by fundus photographs applying an early treatment of diabetic retinopathy study grid to
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Lima, Israel Luiz de, Beatriz Ribeiro Zanon, Eduardo Luiz Longui, and Sandra Monteiro Borges Florsheim. "VARIAÇÃO RADIAL DA DENSIDADE BÁSICA E DIMENSÕES CELULARES DE Croton floribundus." FLORESTA 40, no. 3 (October 1, 2010). http://dx.doi.org/10.5380/rf.v40i3.18929.

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Croton floribundus(capixingui) é encontrado nos estados de Minas Gerais, São Paulo e Paraná. Face à necessidade de novos conhecimentos das propriedades desta madeira, em condições de laboratório, objetivou-se estudar a variação radial da densidade básica e as dimensões celulares desta espécie, oriunda de população natural. De cinco árvores, com DAP médio de 20,35 cm, coletou-se um disco de 7 cm de espessura na região do DAP. Estas árvores estavam localizadas no Parque Estadual da Cantareira, do Instituto Florestal do Estado de São Paulo. De cada disco foram retiradas amostras representando as
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49

Modes, Karina Soares, Raquel Lúcia Ludwig, Magnos Alan Vivian, and Joni Stolberg. "WOOD QUALITY OF Pinus patula Schltdl & Cham FOR THE PULP PRODUCTION." Revista Árvore 43, no. 2 (2019). http://dx.doi.org/10.1590/1806-90882019000200007.

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ABSTRACT The softwood pulp industry is based on the supply of Pinus taeda and P. elliottii woods, and competes for this raw material with other timber sectors. The study aimed to evaluate the wood quality of Pinus patula for pulp and paper production. Trees aged 14 years were obtained from a plantation located in Ponte Alta do Norte, State of Santa Catarina/Brazil. Discs were collected along the commercial height for determining the weighted basic density and its longitudinal variation in the trees, and the chemical composition. For the anatomical characterization, a disc was extracted from th
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50

Tagawa, Miho, Sotaro Ooto, Kenji Yamashiro, Hiroshi Tamura, Akio Oishi, Manabu Miyata, Masayuki Hata, Munemitsu Yoshikawa, Nagahisa Yoshimura, and Akitaka Tsujikawa. "Characteristics of pachychoroid neovasculopathy." Scientific Reports 10, no. 1 (October 1, 2020). http://dx.doi.org/10.1038/s41598-020-73303-w.

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Abstract Recently, several research groups have reported a newly recognized clinical entity of choroidal neovascularization, termed pachychoroid neovasculopathy. However, its characteristics have yet to be well described. The purpose of this study was to investigate the clinical and genetic characteristics of pachychoroid neovasculopathy regardless of treatment modality. This study included 99 eyes of 99 patients with treatment-naïve pachychoroid neovasculopathy. Mean initial best-corrected visual acuity (BCVA) was 0.20 ± 0.32 logMAR, and did not change (P = 0.725) during follow-up period (mea
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