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  • Designing high-speed dental air-turbine handpiece by using ...

    Designing high-speed dental air-turbine handpiece by using a computational approach October 2017 International Journal of Precision Engineering and Manufacturing 18(10):1403-1407

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  • Three-dimensional modelling of turbine wake interactions ...

    A fully three-dimensional numerical approach based on Actuator Disk theory was implemented into the Regional Ocean Modelling System (ROMS) to simulate the energy extraction by tidal stream turbines. Emphasis was placed on wake interactions and cumulative effects of individual devices on energy extraction at array scale.

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  • Accuracy evaluation of a new three-dimensional ...

    The article introduces a new method for three-dimensional reproduction of edentulous dental casts, and wax occlusion rims with jaw relation by using a commercial high-speed line laser scanner and ...

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  • Three-dimensional effects and arm effects on modeling a ...

    Firstly, we compare the power coefficients obtained by using the numerical models (both two-dimensional and three-dimensional) with the experimental results reported by Templin .The basic specifications of the turbine are that the turbine is a one-blade turbine, the blade type is NACA0015 (curved blade, the detailed curvature can be found in Templin ), the solidity (Nc/R, where N and c denote ...

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  • Operator's ability at assessing a high-speed (air turbine ...

    Background The 'high-speed' (air turbine) handpiece is used extensively across many dental disciplines and the ability of clinicians to detect faulty handpieces is essential.. Aim The primary aim ...

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  • Optimum Design of the Dental Air-Turbine Handpiece System ...

    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. The study aimed to find the significant design ...

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  • Development of 1600°C-Class High-efficiency Gas Turbine ...

    The turbine is a highly loaded 4-stage axial flow type for high performance. In addition to the fully three-dimensional design so far employed in the G type for better performance, the turbine aerodynamic technology developed in the national 1,700°C-class gas turbine project was applied.

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  • US20030086788A1 - Three dimensional blade - Google Patents

    The invention relates to an improved three dimensional blade for axial steam turbine comprising a leading edge with inlet flow angle and a trailing edge with an outflow angle a pressure face, suction face and a chord which is the line connecting the leading and trailing edge and the betabi the stagger angle formed to the intersect ion of said chord and U-axis wherein the blade is made of ...

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  • Dental Drill - an overview

    Dental burs have revolutionized the dentistry field and are used for cutting hard tissues such as bone or tooth [1,4,6–9]. 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.

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  • What is 3D printing? How does a 3D printer work? Learn 3D ...

    SLS uses a high power laser to fuse small particles of powder into a mass that has the desired three dimensional shape. The laser selectively fuses powder by first scanning the cross-sections (or layers) on the surface of a powder bed. After each cross-section is scanned, the powder bed is lowered by one layer thickness.

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  • A Numerical Study on Performance of Dental Air Turbine ...

    Usually, high speed air-turbine dental handpieces operate at 200,000 to 400,000 revolutions per minute [5]. The main part of the dental air turbine is its high speed rotor head consisting of a casing with air inlet and outlet nozzles, impeller, spindle, chuck and bearings in millimeter size, as shown in Fig. 1.

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  • Implant Fixture Heat Transfer During Abutment Preparation ...

    The purpose of the study was to evaluate the effect of water flow rate on the heat transmission in implants during abutment preparation using a diamond bur in a high-speed dental turbine. Titanium-alloy abutments (n = 32) were connected to a titanium-alloy implant embedded in an acrylic resin within a water bath at a controlled temperature of ...

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  • Numerical modeling of multi micro jet impingement cooling ...

    This paper reports a numerical investigation on the prediction of the thermal and hydrodynamic flow fields of multi micro jet impingement cooling of three dimensional turbine vanes. A three dimensional vane is modeled with an in-line array of impinging jets of diameters 0.5 and 0.25 mm. The numerical model consists of the steady, Reynolds-Averaged Navier–Stokes equations and the Kω SST ...

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  • Metal casting processes - IIT Guwahati

    three piece moulding. Pattern: It is the replica of the final object to be made. The mould cavity is made with the help of pattern. Parting line: This is the dividing line between the two moulding flasks that makes up the mould. Moulding sand: Sand, which binds strongly without losing its permeability to air or gases. It is a mixture of

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  • Farsoon Technologies – Open for Industry

    Scanning Speed Max. 10 m/s Laser Type Dual fiber laser, 2 × 500W or Single fiber laser, 1 × 500W Scanner High-precision three-axis digital galvo system Laser Spot Size Approx. 70 μm contour, 70-200 μm fill Average Inert Gas Consumption in Process <3 L

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  • The Best Industrial Metal and Plastic 3D Printers I 3D Systems

    ProX SLS 6100. Production-grade nylon 3D printer delivering best-in-class part quality, fast build times and automated production tools. ProX 800. SLA quality at high throughput to address the broadest range of applications. ProJet MJP 2500/2500 Plus. MultiJet Printing Quality, Speed and Ease of Use Made Accessible.

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  • Farsoon Technologies – Open for Industry

    With the 252P series, Farsoon is able to support a wide range of additive solutions in various industries including scientific research, automotive, medical, and aerospace. Like all other Farsoon systems the 252P series is open platform allowing for unprecedented freedom in manufacturing band material development. PRODUCTION INTERFACE.

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  • Study on an Axial Flow Hydraulic Turbine with Collection ...

    We propose a new type of portable hydraulic turbine that uses the kinetic energy of flow in open channels. The turbine comprises a runner with an appended collection device that includes a diffuser section in an attempt to improve the output by catching and accelerating the flow. With such turbines, the performance of the collection device, and a composite body comprising the runner and ...

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  • Comparison of three lasers for dental instrument ...

    The sterilization of dental instruments is an area of great interest and recent concern in the field of dentistry. The purpose of this study was to compare the ability of three lasers (argon, CO 2, and NdYAG) to sterilize dental instruments.Endodontic reamers were contaminated with microorganisms, lased at various levels of energy, placed in Trypticase soy broth, incubated, and read for growth ...

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  • Materials Science and Engineering Laboratory METALLURGY

    high-speed, high precision measurement of thermophysical properties of materials at high temperatures. His recent designs of computer-controlled high-speed optical techniques allowed measurement of thermal and related properties at high …

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  • A Numerical Study on Performance of Dental Air Turbine ...

    Usually, high speed air-turbine dental handpieces operate at 200,000 to 400,000 revolutions per minute [5]. The main part of the dental air turbine is its high speed rotor head consisting of a casing with air inlet and outlet nozzles, impeller, spindle, chuck and bearings in millimeter size, as shown in Fig. 1.

    Get Price
  • Implant Fixture Heat Transfer During Abutment Preparation ...

    The purpose of the study was to evaluate the effect of water flow rate on the heat transmission in implants during abutment preparation using a diamond bur in a high-speed dental turbine. Titanium-alloy abutments (n = 32) were connected to a titanium-alloy implant embedded in an acrylic resin within a water bath at a controlled temperature of ...

    Get Price
  • Numerical modeling of multi micro jet impingement cooling ...

    This paper reports a numerical investigation on the prediction of the thermal and hydrodynamic flow fields of multi micro jet impingement cooling of three dimensional turbine vanes. A three dimensional vane is modeled with an in-line array of impinging jets of diameters 0.5 and 0.25 mm. The numerical model consists of the steady, Reynolds-Averaged Navier–Stokes equations and the Kω SST ...

    Get Price
  • Metal casting processes - IIT Guwahati

    three piece moulding. Pattern: It is the replica of the final object to be made. The mould cavity is made with the help of pattern. Parting line: This is the dividing line between the two moulding flasks that makes up the mould. Moulding sand: Sand, which binds strongly without losing its permeability to air or gases. It is a mixture of

    Get Price
  • Farsoon Technologies – Open for Industry

    Scanning Speed Max. 10 m/s Laser Type Dual fiber laser, 2 × 500W or Single fiber laser, 1 × 500W Scanner High-precision three-axis digital galvo system Laser Spot Size Approx. 70 μm contour, 70-200 μm fill Average Inert Gas Consumption in Process <3 L

    Get Price
  • The Best Industrial Metal and Plastic 3D Printers I 3D Systems

    ProX SLS 6100. Production-grade nylon 3D printer delivering best-in-class part quality, fast build times and automated production tools. ProX 800. SLA quality at high throughput to address the broadest range of applications. ProJet MJP 2500/2500 Plus. MultiJet Printing Quality, Speed and Ease of Use Made Accessible.

    Get Price
  • Farsoon Technologies – Open for Industry

    With the 252P series, Farsoon is able to support a wide range of additive solutions in various industries including scientific research, automotive, medical, and aerospace. Like all other Farsoon systems the 252P series is open platform allowing for unprecedented freedom in manufacturing band material development. PRODUCTION INTERFACE.

    Get Price
  • Study on an Axial Flow Hydraulic Turbine with Collection ...

    We propose a new type of portable hydraulic turbine that uses the kinetic energy of flow in open channels. The turbine comprises a runner with an appended collection device that includes a diffuser section in an attempt to improve the output by catching and accelerating the flow. With such turbines, the performance of the collection device, and a composite body comprising the runner and ...

    Get Price
  • Comparison of three lasers for dental instrument ...

    The sterilization of dental instruments is an area of great interest and recent concern in the field of dentistry. The purpose of this study was to compare the ability of three lasers (argon, CO 2, and NdYAG) to sterilize dental instruments.Endodontic reamers were contaminated with microorganisms, lased at various levels of energy, placed in Trypticase soy broth, incubated, and read for growth ...

    Get Price
  • Materials Science and Engineering Laboratory METALLURGY

    high-speed, high precision measurement of thermophysical properties of materials at high temperatures. His recent designs of computer-controlled high-speed optical techniques allowed measurement of thermal and related properties at high temperatures for complex alloys important to the aerospace industry.

    Get Price
  • Synea Turbines - W&H

    High-end technology for excellent preparation results: Both of the Synea dental turbine ranges are characterised by high performance, quality, optimal ergonomics and outstanding value for money. Synea Vision symbolises innovation with its sterilizable 5 x Ring LED+ and Synea Fusion promises top quality combined with unbeatable cost-efficiency.

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  • 3D printing in dentistry

    3D printing has been hailed as a disruptive technology which will change manufacturing. Used in aerospace, defence, art and design, 3D printing is becoming a subject of great interest in surgery.

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  • Study of microleakage at Class I cavities prepared by Er ...

    OBJECTIVE: The purpose of this in vitro study were to investigate microleakage at class I cavities filled with amalgam, composite resin, or glass-ionomer after preparation by Er:YAG laser and to compare the results with those by a conventional method using an air turbine.

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  • A three-dimensional microfabrication system for ...

    A three-dimensional microfabrication system for biodegradable polymers with high resolution and biocompatibility. Akira Yamada, Fuminori Niikura and Koji Ikuta. Published 17 January 2008 • 2008 IOP Publishing Ltd Journal of Micromechanics and Microengineering, Volume 18, Number 2

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  • F100 Alvaro de Bazan Class Frigate - Naval Technology

    The F100 Alvaro de Bazan Class is a 5,800t multipurpose frigate built by the Spanish shipbuilder, Izar (formerly E.N. Bazan). In February 2005, …

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  • Dental Chairs Manufacturers - China Dental Chairs Factory ...

    JPSM70 is a middle and high-level dental chair. It focuses on creating flexible and practical work environment exclusively. Through Three-dimensional Dynamic Simulation Of The Design, Effective integration of human engineering theory, design more user-friendly.

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  • Professor Robert J K Wood

    Phone: (023) 8059 4881 Email: [email protected] Professor Robert J K Wood FREng, CEng, FIMechE, FICorr, FIMMM, FHEA Professor of Surface …

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  • Weight, High Pressure Ratio Aircraft Turbocharger

    Corrected Speed N/0^, RPM 50,000 85,890Specific Speed, Nss 80 90 Pressure Ratio 8:1 5.7:1 Tip Diameter, inches 9.0 5.0 Tip Speed, ft/sec 1963 1873 Rotor Backsweep Angle, Deg. 36 36 Maximum Adiabatic Eff., % 80 78Number of Blades 13 13 Number of Splitters 13 13 Number of Diffuser Vanes 19 21 The turboprop impeller design used for

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  • Wind turbine noise propagation modelling: An unsteady approach

    a controller, which means the simulated turbine behaves as a real turbine and adjusts according to the incoming turbulent ow eld. The modelled turbine is the NM80 equipped with a large generator of 2.75MW (see [13]). The blade radius is R= 40 m and the rated power is 2:75 MW at rated wind speed of 14 m/s.

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  • Kaplan Turbine MCQ [Free PDF] - Objective Question Answer ...

    The specific speed of a turbine is defined as, the speed of a geometrically similar Turbine that would develop unit power when working under a unit head (1m head). Is prescribed by the relation ({N_s} = frac{{Nsqrt P }}{{{H^{frac{5}{4}}}}}) Low specific speed turbine: The specific speed is less than 50. (varying from 10 to 35 for single ...

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  • Resonant Vibrations Resulting from the Re-Engineering of a ...

    The purpose of developing a second controls turbine with the three blades was to develop a controls test-bed, with the more standard 3-bladed configuration. ... coupling on the high-speed shaft was removed and replaced by a high-speed shaft torque transducer ... A waterfall in our use is a 2-dimensional surface plot. A sliding window is passed ...

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  • Comparing image qualities of dental cone-beam computed ...

    Background/purpose: Cone-beam computed tomography (CBCT) is a useful device in creating 3-dimensional images in the examining area of dentistry and is one of the most common clinical methods in detecting second mesiobuccal (MB2) canals in maxillary molars. The aim of this in vitro study was to compare the image quality of the small field of view (FOV) CBCT with different rotation arcs and ...

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  • DDG-51 ARLEIGH BURKE-class - Navy Ships

    Each of the three Gas Turbine Generator Sets (GTGS) is rated at 2500 KW and supplies 450 VAC, three-phase, 60 HZ power. #1 GTGS is located in Auxiliary Machinery Room #1, #2 GTGS is located in Main Engine Room #2, and #3 GTGS is located in #3 Generator Room. The GTGS are separated from each other by three watertight bulkheads for survivability.

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  • Commercial, Professional, & Industrial 3D Printers

    3D Printers. Stratasys industrial-grade professional 3D printers use PolyJet or FDM technologies to provide solutions to a wide range of needs from rapid prototyping to manufacturing.. Are you a production engineer, a designer, healthcare/dental professional or an education expert? Our 3D printers are designed to help you be more innovative and efficient.

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  • Industrial Applications of 3D Printing: The Ultimate Guide ...

    The aerospace and defence (A&D) industry is one of the earliest adopters of 3D printing, with the first use of the technology going back to 1989. Now, three …

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  • CNC Coordinate Measuring Machine CRYSTA-Apex V Series

    high-speed measurement unaffected by processing accuracy or probe path control errors while maintaining the advantages of 3D optimal path scanning measurement, by limiting discrepancies between design values and the actual workpiece. The intricacy of some workpieces (e.g. turbine blades, fan blades, and impellers) causes their processing

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  • The History of 3D Printing

    3D printing, also called additive manufacturing is a process of making three-dimensional solid objects using a digital file. Prior to …

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  • DDG-993 KIDD-class - Navy Ships - Federation of American ...

    DDG-993 KIDD-class The KIDD class are the most powerful multi-purpose destroyers in the fleet. The four ships of this class, originally designed for sale to the then-friendly Iranian Navy, are unique among US Warships, in that it combines the combat systems capability of the former VIRGINIA-class cruisers with the proven anti-submarine warfare qualities of a SPRUANCE-class destroyer.

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  • DD-151 Asagiri Class - GlobalSecurity.org

    The DD-151 Asagiri ['morning mist'] class is an enlargemed and improved version of the Hatayuki general-purpose escort ship. The Asagiri class are longer, have an updated sensors fit and a more ...

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  • Death Machine

    The Death Machine in Call of Duty: Black Ops II is a new 'future' model, while the Call of Duty: Black Ops Death Machine model appears as the Minigun.The Death Machine gun model is also used on the Call of Duty: Black Ops II Sentry Gun.Players also have the ability to sprint with this weapon. Campaign 'High capacity, multi-barreled Gatling gun with an extremely high rate of fire.

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  • Engine Debris Fuselage Penetration Testing, Phase II

    engine failure structural impact tests. A large 12-inch gas gun was used to launch turbojet engine fan blade segments into a narrow-body commercial aircraft fuselage. The impacts were documented and analyzed with high-speed photography. Impact velocities, presented areas, and residual velocities were calculated.

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  • Dental Supplies and Medical Supplies - Henry Schein

    Henry Schein is a worldwide distributor of medical and dental supplies including vaccines, pharmaceuticals, financial services and equipment.

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  • Remineralization of Demineralized Enamel by Toothpastes: A ...

    The three-dimensional (3D) stereo-photographs (anaglyphs) were created by taking two stereo-pair photographs, the first at 0° and the second with a 7° tilt. The green filter was used for the first, and the red filter was used for the second photograph. The microphotographs were superimposed and visualized with 3D anaglyphic glasses.

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  • Gone with the Wind Energy: Design-Build-Test Mini Sail ...

    Students explore the use of wind power in the design, construction and testing of 'sail cars,' which, in this case, are little wheeled carts with …

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  • LS-DYNA

    LS-DYNA in Metal Forming. One of LS-DYNA's most widely used applications is metal forming. LS-DYNA® accurately predicts the stresses and deformation experienced by metal, and determines if the metal will fail. LS-DYNA® supports adaptive remeshing and will refine the mesh during the analysis, as necessary, to increase accuracy and save time.

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  • US5121329A - Apparatus and method for creating three ...

    Apparatus incorporating a movable dispensing head provided with a supply of material which solidifies at a predetermined temperature, and a base member, which are moved relative to each other along 'X,' 'Y,' and 'Z' axes in a predetermined pattern to create three-dimensional objects by building up material discharged from the dispensing head onto the base member at a controlled rate.

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  • Flow meters

    A flow meter (or flow sensor) is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a gas. When …

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  • Department of Mechanical and Aerospace Engineering < Case ...

    High-speed Hg-Cd-Te detector arrays are available for making time-resolved multi-point non-contact temperature measurements. A Schenck Pegasus digital servo-controlled hydraulic testing system with a 20Kip Universal testing load frame equipped with hydraulic grips and instrumentation is available for quasi-static mechanical testing under load ...

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  • In vitro comparative study of apical microfiltration in ...

    INTRODUCTION: The proper endodontic treatment depends on the necessary procedures to shape, clean, disinfect and seal the complex system of root canals in three-dimensional form, that is, achieve a hermetic seal 1, 2.This will allow to occupy the space created by the surgical preparation including, as far as possible, its ramifications or any of its anatomical variations, and without ...

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  • Incheon FFX Future Frigate - GlobalSecurity.org

    Incheon FFX Future Frigate. The frigates are named after a metropolitan city, province or the seat of a provincial government. The new Incheon FFX is a planned class to replace Ulsan and other ...

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  • New English-Irish Dictionary from Foras na Gaeilge

    由于此网站的设置,我们无法提供该页面的具体描述。

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  • Military Daily News, Military Headlines

    Daily U.S. military news updates including military gear and equipment, breaking news, international news and more.

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  • interview questions

    Job interview questions and sample answers list, tips, guide and advice. Helps you prepare job interviews and practice interview skills and techniques.

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