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  • [Analysing noise levels in dental environment. Air

    Turbine sound must be considered from the standpoint of the sound pressure level and frequency component. In this study, the sound samples was measured and analysed in octave band spectrum. Turbine sound has three resonance bands of the frequency with the range from 0 to 1,600 Hz and the resonance band increased as air pressure increased.

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  • Analysis of Noise Frequency of High-speed Air

    Download Citation | Analysis of Noise Frequency of High-speed Air Turbine Dental Handpiece | Noise of high-speed air turbine dental handpiece is one of the serious noise pollution sources in ...

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  • Optimum Design of the Dental Air-Turbine Handpiece

    2020-1-22 · An air-turbine and associated air supply tube was optimized as a dental air-turbine handpiece system. The system consists of an air-turbine with an impeller and a housing, and an air supply tube which supplies compressed-air to the air-turbine. The flow characteristics of the dental air-turbine handpiece system were investigated using ANSYS CFX.

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  • Auro-3D Auro Technologies : Three-dimensional sound

    The AURO-3D technology is a leading immersive – and fully backwards compatible – technology and format that creates a full, three-dimensional space around the listener and now also available on the latest Qualcomm QCS407 platform.

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  • Sound Generation and Propagation in a Centrifugal

    2013-7-9 · Moreover, the flow and acoustic effects are resolved on different length scales. This makes the computations more efficient. The EIF method accounts both for the sound radiation and scattering. In the presented paper a further development towards three dimensional simulations and numerical implementation for centrifugal pumps is presented.

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  • Dental Drill - an overview | ScienceDirect Topics

    They are normally made of stainless steel, diamond grit or particles, and tungsten carbide and fitted to a dental drill incorporating an air turbine. The dental bur was developed <300 years ago [8] and still widely used. The dental bur [4,8,9] has three parts: the head, the neck, and the shank. The head contains the blades, which produce cutting action by rotary motion.

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  • Auro-3D Auro Technologies : Three-dimensional sound

    2021-5-20 · Mol, Belgium – May 20th 2021 – Today, May 20th 2021, Auro Technologies is pleased to announce that our 3D-audio format AURO-3D will be introduced by Yamaha on its newest AVENTAGE AV Receiver platforms. YAMAHA announced today their newest AVENTAGE AV Receiver Models RX-A8A and RX-A6A , offering 11- and 9- channels, respectively. The AURO-3D…

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  • Auro-3D Auro Technologies : Three-dimensional sound

    On Wednesday 28 th October, AURO Technologies in conjunction with WOWOW conducted an Advanced Audio Distribution Experiment from Hakuju Hall in Tomigaya with great success. This was the world’s first attempt to hold a piano and drum duo concert by Mayo Nakano and Takanobu Baba, and to live-stream the video and sound using the AURO-3D high-quality immersive audio coding technology …

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  • (PDF) Looping Dynamic Characteristics of a Pump

    and three-dimensional (3D) pump-turbine. The results show that the runaway dynamic trajectories form loops in the S-shaped region in the unit discharge and unit torque charts

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  • Amazon.com: dental air compressor

    Dental Market Portable Air Compressor Extra Quiet,Oil-free,Low Vibration 31.7 Gallon Tank Max Pressure 116PSI 3200W Power with 9.8 Feet Hose. 2,586.00.

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  • Noise level evaluation of dental handpieces

    We evaluated the noise level of fourteen air-driven handpieces, six low speed (less than 20,000 rev/min) and eight high speed (greater than 160,000 rev/min), with respect to a three-directional co-ordinate system and distances of 6, 12 and 18 in. in each chosen direction. A two-way analysis of varia …

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  • Three-Dimensional Multi-Objective Design

    2012-5-23 · Three-Dimensional Design and Optimization of a Transonic Rotor in Axial Flow Compressors 25 March 2013 | Journal of Turbomachinery, Vol. 135, No. 3 Uncertainty-based robust aerodynamic optimization of rotor blades

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  • Modeling of Three-Dimensional Viscous Compressible ...

    2012-5-17 · Surrogate based optimization of a Bi-Directional impulse turbine for OWC-WEC: Effect of guide vane lean and stagger angle for pseudo-sinusoidal wave conditions Ocean Engineering, Vol. 226 Investigation of the tip injection for stall control in a transonic compressor with inlet distortion

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  • Two- and Three-Dimensional Simulation of Sound

    Sound propagation over sonic crystals has attracted much interest and been studied during the past few decades. In the late 1980s, several studies showed that a transparent material could become opaque for any light wave vector if a strong modulation of the refractive index in the three dimensions of the space is attained [].In the 1990s, it was demonstrated that sculptures built by the ...

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  • Darrieus wind turbine blade unsteady aerodynamics: a

    2017-6-1 · Two-dimensional RANS analyses, suitably corrected for three-dimensional (3D) effects, such as struts resistive torque and blade tip losses, have been used to estimate the turbine overall performance and predominantly 2D phenomena, like virtual camber and virtual incidence effects, the influence of unsteady wind conditions on turbine ...

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  • Y.X. XIAO | Professor (Associate) | PhD | Tsinghua ...

    The present paper analyzed the inner flow characteristic of a reversible pump-turbine at pump mode with the optimal guide vane opening. ... for a Pelton turbine. Three-dimensional unsteady air ...

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  • Implicit Finite-Difference Simulations of Three ...

    2012-10-3 · Implicit Finite-Difference Simulations of Three-Dimensional Compressible Flow. Thomas H. Pulliam and. Joseph L. Steger. Thomas H. Pulliam. NASA Ames Research Center, Moffett Field, Calif. Search for more papers by this author. and. Joseph L. Steger. NASA …

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  • Dental Instruments Australia |Dental Equipment

    2007-4-28 · Three-dimensional topographic scanning electron microscope and Raman spectroscopic analyses of the irradiation effect on teeth by Nd:YAG, Er:YAG, and CO2 lasers. J …

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  • Center for Turbulence Research Proceedings of the

    2015-1-4 · 3-D CFD analysis for air turbine by Hushmandi (2010) and Kalkkuhl et al. (2014). Tokuyama et al. (2014) conducted a URANS CFD of a two-stage full annular supersonic turbine for a rocket turbo pump under partial admission. To the authors’ knowledge, this study is the rst attempt to apply LES to the analysis of partial admission of steam turbine.

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  • Dental Compressors: Wide Range of Dental Air

    The air turbine in the airotor handpiece, chair valves, delivery units, scalers and the three-way syringe use this compressed air produced by the compressor. The air compressor must be purchased having various factors in mind since the compressed air has direct contact with the patient and any form of contamination is undesirable.

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  • Dental Imaging With Near-Infrared Transillumination

    2020-10-13 · The dental images of four sound teeth samples by three light sources are shown in Fig. 3. The output powers of three light sources are controlled at –1.5 dBm. From Fig. 3(i), the NLL image blurs the dental image because of the high coherence caused interference. The highly coherent NLL is not capable of dental imaging since the speckle pattern

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  • Noise reduction in centrifugal pump as turbine:

    To reduce the interior/exterior flow-induced noise in centrifugal pump as turbine (PAT), based on the relation between in-phase hydrodynamic action and radiated noise, the angle formula in ideal condition by individually leaning blade was proposed. Considering the joint leaning effect, the formulas associated with parallel- and counter-leaning blade and tongue were presented.

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  • Present Status of Pulse and Rotating Detonation Engine ...

    2019-2-25 · 2.3. Pulse Detonation Turbine Engines It is possible to extract work from a high-enthalpy burned-gas jet by attaching a turbine mechanism to a PDE tube’s exit. Such a system is called a pulse detonation turbine engine (PDTE). Endo et al. [32] achieved 9.0% thermal efficiency for their PDTE. Velocities at the exit of the PDE tube in a PDTE

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  • Tiny bubbles challenge giant turbines: Three Gorges

    2015-10-6 · 11 For example, the wall-normal position of the three-dimensional TS-wave amplitude maxima is roughly at the non-dimensional distance y/δ* = 0.75 (i.e. U/U e = 0.42) . 12 The Reynolds number for the prototype is calculated based on the runner inlet diameter D 1 and, for models, it is estimated based on the current conditions of turbine test ...

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  • Boundary Layer (Tesla) Turbine Page

    2003-1-22 · The flow field in a shrouded six-bladed centrifugal pump impeller has been investigated using large eddy simulation (LES). The effect of the subgrid scales has been modeled through a localized dynamic Smagorinsky model implemented in the commercial CFD code FINE/Turbo.

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  • Portable Dental Unit Australia - BPR Swiss | Ivoclar ...

    For those with limited square footage, for example, a wall-mounted dental X-ray machine can save space. Smaller digital X-ray sensors are useful for working with pediatric patients. For more complex procedures, such as extractions or root canals, a cone beam X-ray machine provides a three-dimensional image that allows for better treatment planning.

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  • Dental X-Ray Equipment - Digital Dental X-Ray

    2019-6-5 · Noise levels in dental schools J. C. Sampaio Fernandes1, A. P. O. Carvalho2, M. Gallas3, P. Vaz4 and P. A. Matos5 1Department of Fixed Prosthesis, Faculty of Dentistry, University of Porto, 2Laboratory of Acoustics, Department of Civil Engineering, Faculty of Engineering, University of Porto, 3University of Porto, Porto, Portugal, 4Faculty of Medicine and Dentistry, School of Dentistry ...

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  • Boundary Layer (Tesla) Turbine Page

    2005-6-13 · In a turbine engine, compression is accomplished aerodynamically as the air passes through the stages of the compressor, rather than by confinement, as is the case in a piston engine. The air flowing over the compressor airfoils can stall just as the air over the wing of an airplane can.

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  • Regenerative Blowers | Becker Pumps Corporation

    1999-1-11 · Dimensional Analysis and Similarity . Introduction - The Purposes and Usefulness of Dimensional Analysis . Dimensional analysis is a very powerful tool, not just in fluid mechanics, but in many disciplines. It provides a way to plan and carry out experiments, and enables one to scale up results from model to prototype.

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  • Noise levels in dental schools

    2007-4-28 · Three-dimensional topographic scanning electron microscope and Raman spectroscopic analyses of the irradiation effect on teeth by Nd:YAG, Er:YAG, and CO2 lasers. J …

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  • Aircraft engine operation and malfunction

    2008-9-26 · 5.2 The Principle of Dimensional Homogeneity Re p Re m 25.3 998V 0. p 0 (0 0. 1 001) or V p 0.0253 m/s 2.53 cm/s Ans. C Fp C Fm 1.14 or F p 7.31 10 7 N Ans. It would obviously be difficult to measure such a tiny drag force. Historically, the first person to write extensively about units and dimensional reasoning

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  • Sonic and ultrasonic scalers in periodontal treatment:

    2007-1-23 · The sound level that exceeds this frequency is called ultrasonic sound. In dental units, equipment such as ultrasonic scalers, high-speed air turbine drills, high-volume evacuators, and amalgamators mostly produce high intensity noise that may be a potential hazard to the auditory system of the persons exposed to the ultrasound.

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  • Noise levels in dental schools

    2019-6-5 · Audible sound consists of pressure waves in air with a frequency range of 20 Hz to 20 kHz. Human hearing does not respond uniformly ... Suction pump 1986 Kavo Dental, GMbH, Germany 6583400 Annexe of the ... Turbine (little use) 1995 Kavo Dental, GMbH, Germany 650B 100 7294 Clinic Turbine (brand new and used) 1995 Kavo Dental, GMbH, Germany 640B ...

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  • Dental Technology Melbourne | Smile Solutions

    2021-7-25 · Streamlining Dental Equipment. Each item of equipment used at Smile Solutions is designed to achieve a particular result. Among the most significant outcomes that we offer you as our patient are: a streamlining of your dental treatment, a beautiful smile, improved diagnosis of all dental conditions, a superior level of treatment, reduced pain and anxiety, a safeguarding of your health and ...

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  • Alessandro Sabato | Mechanical Engineering | UMass

    2021-7-20 · A novel camera localization system for extending three-dimensional digital image correlation. Chen, S., Sabato, A., Niezrecki, C., Avitabile, P., Huber, T. (2018). Characterization and modeling of the acoustic field generated by a curved ultrasound transducer for non-contact structural excitation. Journal of Sound and Vibration, 432 33--49.

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  • Surgical lasers and hard dental tissue | British Dental ...

    2007-4-28 · Three-dimensional topographic scanning electron microscope and Raman spectroscopic analyses of the irradiation effect on teeth by Nd:YAG, Er:YAG, and CO2 lasers. J …

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  • Present Status of Pulse and Rotating Detonation Engine ...

    2019-2-25 · 2.3. Pulse Detonation Turbine Engines It is possible to extract work from a high-enthalpy burned-gas jet by attaching a turbine mechanism to a PDE tube’s exit. Such a system is called a pulse detonation turbine engine (PDTE). Endo et al. [32] achieved 9.0% thermal efficiency for their PDTE. Velocities at the exit of the PDE tube in a PDTE

    Get Price
  • Implicit Finite-Difference Simulations of Three ...

    2012-10-3 · Implicit Finite-Difference Simulations of Three-Dimensional Compressible Flow. Thomas H. Pulliam and. Joseph L. Steger. Thomas H. Pulliam. NASA Ames Research Center, Moffett Field, Calif. Search for more papers by this author. and. Joseph L. Steger. NASA …

    Get Price
  • Bifurcation analysis for vibrations of a turbine blade ...

    2016-5-24 · A reduced three-degree-of-freedom model simulating the fluid-structure interactions (FSI) of the turbine blades and the oncoming air flows is proposed. The equations of motions consist of the coupling of bending and torsion of a blade as well as a van der Pol oscillation which represents the time-varying of the fluid. The 1:1 internal resonance of the system is analyzed with the multiple scale ...

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