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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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  • Dental Drill - an overview | ScienceDirect Topics

    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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  • A NUMERICAL STUDY ON AN AXIAL HYDRAULIC

    A NUMERICAL STUDY ON AN AXIAL HYDRAULIC TURBINE OF SIHWA-LAKE TIDAL POWER PLANT IN KOREA ... Man-Woong Heo1, Kyung-Hun Cha1, Kwang-Yong Kim1,*, ... three-dimensional Reynolds-averaged Navier-Stokes

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  • Analysis on the Low Speed Performance of an Inward

    A suction device with a suction hose and suction cannula for dental treatment units for the sucking off of the spray mist during dental treatment processes in which the suction hose is placed on or in a flexible tube, which is movable in three-dimensional manner, so that the suction hose can be brought into the treatment position and can be positioned there without any need for a dental nurse.

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  • Suction device for dental treatment units -

    2018-1-23 · To predict the vibration characteristics of the crankshaft of the larger marine diesel engine accurately and comprehensively, based on the finite element models of the crankshaft and the engine block reduced by a component mode synthesis (CMS) method as well as extended Reynolds equation and Greenwood-Tripp theory, a mixed thermo-elasto-hydro-dynamic lubrication coupling model …

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  • Three-Dimensional Vibration of the Crankshaft of a

    2014-3-6 · The present paper contributes to the modeling of unsteady flow analysis of vertical axis wind turbine (VAWT). Double multiple streamtube (DSMT) model was applied for the performance prediction of straight bladed fixed pitch VAWT using NACA0018 airfoil at low wind speed. A moving mesh technique was used to investigate two-dimensional unsteady flow around the same VAWT model with …

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  • Double Multiple Streamtube Model and Numerical

    2015-9-30 · Chapter 5 • Dimensional Analysis and Similarity 5.1 For axial flow through a circular tube, the Reynolds number for transition to turbulence is approximately 2300 [see Eq. (6.2)], based upon the diameter and average velocity. If d = 5 cm and the fluid is kerosene at 20°C, find the volume flow rate in m3/h which causes transition. Solution: For kerosene at 20°C, take ρ = 804 kg/m3 and μ ...

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  • Chapter 5 Dimensional Analysis and Similarity

    2012-8-1 · The idea was raised to have a wind turbine on the tower placed below the antennas to avoid the risk of electromagnetic interference . For a thick telecom tower like this one the obvious choice of wind turbine is a three-dimensional turbine which is not dependent of the wind direction.

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  • Design of a unique direct driven PM generator

    A study has been made of the influence of grouping parameters on the mean pressure distributions experienced by three dimensional bluff bodies immersed in a turbulent boundary layer. The range of variable parameters has included group density, group pattern and incident flow type and direction for a simple cuboid element form.

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  • A Reference Pelton Turbine—Three-Dimensional Flow

    2018-6-26 · The turbine tested was the reference Pelton runner, designed at the Waterpower Laboratory, Norwegian University of Science and Technology (NTNU). The method relies on interpolation to three-dimensional (3D) map the inner hydraulic surface of the bucket.

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  • Portable Dental Turbine Unit 4 Hole Plastic Tube For

    Specifications 1.easy to operation. 2.best price with good quality Dental portable turbine controller 1. Water pressure: 0.1Mpa~0.25Mpa 2. pressure for handpiece: 0.01Mpa~0.4Mpa. 3. Air pressure input: 4~8kg 4. Air pressure output: 0~4kg 5. Air pressure to handpiece: 0.01Mpa~0.4Mpa+C317a 6. Water pressure output: 0~2kg 7. Size: 160mmx120mmx80mm.

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  • Self-assembled micro-computed tomography for

    The self-assembled micro-CT system was constructed using a portable dental X-ray tube, an intraoral digital X-ray detector, a high-precision rotation stage, related bracket accessories, and a notebook computer. Reconstructed images and three-dimensional models of the maxillary right third molar were produced using the self-assembled micro-CT ...

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  • Design of a Three-Dimensional Hypersonic Inward

    2018-11-27 · The operation of a propulsion system in terms of horizontal takeoff/landing and full-speed range serves as one of the main difficulties for hypersonic travelling. In the present work, a three-dimensional inward-turning inlet with tri-ducts for combined cycle engines is designed for the operation of three different modes controlled by a single rotational flap on the compression side, which ...

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  • Flow in the Simplified Draft Tube of a Francis Turbine ...

    2014-3-6 · Unsteady, three-dimensional simulations show that the jet increases the axial momentum of flow at the center of the draft tube and decreases the wake of the crown cone and thereby decreases the shear at the interface of the stagnant region and high velocity outer flow, which ultimately results in elimination of the vortex rope.

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  • Three-dimensional simulation of unsteady flows in a

    2016-5-12 · Three-dimensional numerical simulation for a prototype pump-turbine has been performed to investigate the transient characteristics and flow behaviors in the startup process. The rotational speed, which varies with runner torque and inertial of the rotating systems, is obtained by hydraulic-force coupling method.

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  • A Finite Element Method for Three-Dimensional

    2010-9-24 · A method for predicting the onset of acoustically driven combustion instabilities in gas turbine combustor is examined. The basic idea is that the governing equations of the acoustic waves can be coupled with a flame heat release model and solved in the frequency domain. ... The method can be applied virtually to any three-dimensional geometry ...

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  • Three-Dimensional Vibration of the Crankshaft of a

    2018-1-23 · To predict the vibration characteristics of the crankshaft of the larger marine diesel engine accurately and comprehensively, based on the finite element models of the crankshaft and the engine block reduced by a component mode synthesis (CMS) method as well as extended Reynolds equation and Greenwood-Tripp theory, a mixed thermo-elasto-hydro-dynamic lubrication coupling model …

    Get Price
  • An Investigation of the Forces on Three Dimensional

    A study has been made of the influence of grouping parameters on the mean pressure distributions experienced by three dimensional bluff bodies immersed in a turbulent boundary layer. The range of variable parameters has included group density, group pattern and incident flow type and direction for a simple cuboid element form.

    Get Price
  • SIMULATION OF VORTEX ROPE IN A TURBINE DRAFT TUBE

    Proceedings of the Hydraulic Machinery and Systems 21st IAHR Symposium September 9-12, 2002, Lausanne 22.10.2002 4 Fig 4: Vortex rope in the draft tube for two time steps

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  • A biomechanical investigation of mandibular molar

    2017-8-28 · Construction of three-dimensional FEA models The experimental models were fixed in a micro-CT scan-ner (inspeXio SMX-90CT, SHIMADZU, Kyoto, Japan) and scanned under the following imaging conditions: tube voltage, 90 kV; tube current, 109 nA; and slice thickness, 100 μm. FEA software (Mechanical Finder®, Research

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  • A Novel Method for the Assessment of Three

    2009-5-1 · Objective: To (1) evaluate the stability of palatal rugae as landmarks for superimposition of dental casts and (2) establish a three-dimensional superimposition method of maxillary dental casts for analyzing orthodontic tooth movement. Materials and Methods: The sample consisted of dental casts obtained from 10 patients treated with extraction of bilateral maxillary first premolars and ...

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  • Highly-reliable Design Technology of Steam Turbine for ...

    2015-3-31 · Multi-stage quasi-three-dimensional unsteady flow analysis can analyze the steam flow between stages in a comparatively short time and this allows the design of the flow pattern in the turbine to be performed more quickly and with greater accuracy. Basic Strategy and Structure for Developing New Blade In deciding how to counter this problem, the

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  • Three-dimensional radiative heat-transfer solutions by

    2012-5-23 · Three-dimensional radiative transfer modeling using the control volume finite element method Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 105, No. 3 Numerical and experimental investigations to lower environmental impact of an open fireplace

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  • Steam Turbines for Power Generation | GE Steam Power

    2021-7-23 · ARABELLE 1700. Nuclear reheat. Up to 75bar 300°C 1090psig 570F. 1200 - 1900MW. GE’s Arabelle turbine is the most powerful nuclear steam turbine in operation. Suiting all reactors type, from 700MW up to 1,900MW, the Arabelle is highly efficient, reliable, and cost effective. Learn more about Arabelle 1700.

    Get Price
  • making work easy 1 - Renfert

    2020-2-19 · dental practice, patients and specialists 4 Creation of photos and video sequences Optimum assessment of object structures in 3D mode The EASY view 3D’s three-dimensional mode enables easy hand-eye coordination and a natural working position. Its three-dimensional spatial representation is perfect for critically examining work objects.

    Get Price
  • US4575330A - Apparatus for production of three

    A system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, successive adjacent laminae, representing corresponding successive adjacent cross ...

    Get Price
  • US5121329A - Apparatus and method for creating

    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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  • Innovative tube measurement supports rail

    An innovative high-precision three-dimensional glass reference serves as the basis for measurement, which ensures reliable stability within a manufacturing environment. TubeInspect represents the height of what optical metrology can do for the tube and wire industry today and is an important building block for the CRRC Group to solve some of ...

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

    3D printing or additive manufacturing is a process of making three dimensional solid objects from a digital file. The creation of a 3D printed object is achieved using additive processes. In an additive process an object is created by laying down successive layers of material until the object is created. Each of these layers can be seen as a ...

    Get Price
  • A Novel Method for the Assessment of Three

    2009-5-1 · Objective: To (1) evaluate the stability of palatal rugae as landmarks for superimposition of dental casts and (2) establish a three-dimensional superimposition method of maxillary dental casts for analyzing orthodontic tooth movement. Materials and Methods: The sample consisted of dental casts obtained from 10 patients treated with extraction of bilateral maxillary first premolars and ...

    Get Price
  • A biomechanical investigation of mandibular molar

    2017-8-28 · Construction of three-dimensional FEA models The experimental models were fixed in a micro-CT scan-ner (inspeXio SMX-90CT, SHIMADZU, Kyoto, Japan) and scanned under the following imaging conditions: tube voltage, 90 kV; tube current, 109 nA; and slice thickness, 100 μm. FEA software (Mechanical Finder®, Research

    Get Price
  • Steam Turbines for Power Generation | GE Steam Power

    2021-7-23 · ARABELLE 1700. Nuclear reheat. Up to 75bar 300°C 1090psig 570F. 1200 - 1900MW. GE’s Arabelle turbine is the most powerful nuclear steam turbine in operation. Suiting all reactors type, from 700MW up to 1,900MW, the Arabelle is highly efficient, reliable, and cost effective. Learn more about Arabelle 1700.

    Get Price
  • Three-dimensional radiative heat-transfer solutions by

    2012-5-23 · Three-dimensional radiative transfer modeling using the control volume finite element method Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 105, No. 3 Numerical and experimental investigations to lower environmental impact of an open fireplace

    Get Price
  • US4575330A - Apparatus for production of three

    A system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, successive adjacent laminae, representing corresponding successive adjacent cross ...

    Get Price
  • making work easy 1 - Renfert

    2020-2-19 · dental practice, patients and specialists 4 Creation of photos and video sequences Optimum assessment of object structures in 3D mode The EASY view 3D’s three-dimensional mode enables easy hand-eye coordination and a natural working position. Its three-dimensional spatial representation is perfect for critically examining work objects.

    Get Price
  • US5121329A - Apparatus and method for creating

    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.

    Get Price
  • Beeswax as Dental Filling on a Neolithic Human Tooth

    2012-9-19 · Evidence of prehistoric dentistry has been limited to a few cases, the most ancient dating back to the Neolithic. Here we report a 6500-year-old human mandible from Slovenia whose left canine crown bears the traces of a filling with beeswax. The use of different analytical techniques, including synchrotron radiation computed micro-tomography (micro-CT), Accelerator Mass Spectrometry (AMS ...

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  • dimensions fundamental dimensions Principle of

    2013-7-8 · Hydraulics 2 T3-1 David Apsley TOPIC T3: DIMENSIONAL ANALYSIS AUTUMN 2013 Objectives (1) Be able to determine the dimensions of physical quantities in terms of fundamental dimensions. (2) Understand the Principle of Dimensional Homogeneity and its use in checking equations and reducing physical problems.

    Get Price
  • What is 3D printing? How does a 3D printer work?

    3D printing or additive manufacturing is a process of making three dimensional solid objects from a digital file. The creation of a 3D printed object is achieved using additive processes. In an additive process an object is created by laying down successive layers of material until the object is created. Each of these layers can be seen as a ...

    Get Price
  • Steam Turbines for Power Generation | GE Steam Power

    2021-7-23 · ARABELLE 1700. Nuclear reheat. Up to 75bar 300°C 1090psig 570F. 1200 - 1900MW. GE’s Arabelle turbine is the most powerful nuclear steam turbine in operation. Suiting all reactors type, from 700MW up to 1,900MW, the Arabelle is highly efficient, reliable, and cost effective. Learn more about Arabelle 1700.

    Get Price
  • making work easy 1 - Renfert

    2020-2-19 · dental practice, patients and specialists 4 Creation of photos and video sequences Optimum assessment of object structures in 3D mode The EASY view 3D’s three-dimensional mode enables easy hand-eye coordination and a natural working position. Its three-dimensional spatial representation is perfect for critically examining work objects.

    Get Price
  • Advancements in metal 3D printing - Roland Berger

    2021-7-23 · and turbine blades. For the last of these items, PBF-L costs as much as 70 times more than conventional man-ufacturing techniques, for example. B The productivity of PBF-L is closely linked to the num-ber of lasers that are active at the same time. One produc-er of PBF-L equipment is currently preparing to launch a

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  • US5121329A - Apparatus and method for creating

    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.

    Get Price
  • US4575330A - Apparatus for production of three

    A system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, successive adjacent laminae, representing corresponding successive adjacent cross ...

    Get Price
  • i-CAT | KaVo Dental

    2 天前 · A Company of Innovation, Quality, Education, and Service. Serving the dental industry since 1992, i-CAT is at the global forefront in the development and manufacturing of award-winning advanced dental and maxillofacial radiography products. Praised by owners, esteemed educational organizations, and the dental community at large, i-CAT ...

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  • Pressurized Water Reactor (PWR) Systems

    2020-10-16 · A three-loop Westinghouse plant has three steam generators, three reactor coolant pumps, and a pressurizer. The three-loop units in the United Stat es are Beaver Valley 1 a nd 2, Farley 1 and 2, H. B. Robinson 2, North Anna 1 and 2, Shearon Harris 1, V. C. Summer, Surry 1 and 2, and Turkey Point 3 and 4. Each of these plants has 157 fuel ...

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  • Applications of cone beam computed tomography in ...

    2020-9-21 · Compression of three-dimensional anatomy. By compressing the three-dimensional anatomy into a two-dimensional image, conventional radiography adversely limits the diagnostic accuracy (Webber & Messura, 1999; Nance et al., 2000; Cohenca et al., 2007a). The appreciation of the bucco-lingual plane is minimal and the spatial relationship of the ...

    Get Price
  • What is 3D printing? How does a 3D printer work?

    3D printing or additive manufacturing is a process of making three dimensional solid objects from a digital file. The creation of a 3D printed object is achieved using additive processes. In an additive process an object is created by laying down successive layers of material until the object is created. Each of these layers can be seen as a ...

    Get Price
  • dimensions fundamental dimensions Principle of

    2013-7-8 · Hydraulics 2 T3-1 David Apsley TOPIC T3: DIMENSIONAL ANALYSIS AUTUMN 2013 Objectives (1) Be able to determine the dimensions of physical quantities in terms of fundamental dimensions. (2) Understand the Principle of Dimensional Homogeneity and its use in checking equations and reducing physical problems.

    Get Price