نتایج جستجو برای: water jet

تعداد نتایج: 584990  

Journal: :Quintessence international 2015
Liran Levin Shai Frankenthal Livia Joseph Doron Rozitsky Guy Levi Eli E Machtei

BACKGROUND Peri-implant disease following successful integration of an endosseous implant is the result of an imbalance between bacterial load and host defense, which may affect not only the peri-implant mucosa but also involve the supporting bone. OBJECTIVES The aim of this study was to evaluate the adjunctive effect of a dental water jet rinse mixed with chlorhexidine gel to the nonsurgical...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2010
ferial nosratinia mohammad reza omidkhah dariush bastani ali akbar saifkordi

in this research mass transfer coefficient under jetting regime in different directions (from dispersed to continuous and continuous to dispersed phase) has been studied using an experimental setup. n-butanol-succinic acid-water with low interfacial tension has been selected as experimental chemical system. the effects of various parameters such as jet velocity, nozzle diameter and the height o...

2017
Naohisa Yoshida Takashi Toyonaga Takaaki Murakami Ryohei Hirose Kiyoshi Ogiso Yutaka Inada Rafiz Abdul Rani Yuji Naito Mitsuo Kishimoto Yoshiko Ohara Takeshi Azuma Yoshito Itoh

BACKGROUNDS With respect to the knife's design in colorectal endoscopic submucosal dissection (ESD), diameter, water jet function, and electric power are important because these relate to efficient dissection. In this study, we analyzed a novel, narrow ball tip-typed ESD knife with water jet function (Flush knife BT-S, diameter: 2.2 mm, length: 2000 mm, Fujifilm Co., Tokyo, Japan) compared to a...

2007
Etienne Robert Jacques Lettry Mohamed Farhat Peter A. Monkewitz François Avellan

The growth and collapse of laser-induced vapor cavities inside axisymmetric free-falling liquid water jets have been studied. Bubbles of different size are generated at various distances from the jet axis and the effects on the jet interface are recorded by means of ultrafast cinematography. The configuration is characterized by two dimensionless parameters: the bubble to jet diameter ratio and...

Journal: :Physical review letters 2003
C D Ohl R Ikink

Free gas bubbles in water with radii between 7 and 55 microm subjected to a shock wave exhibit a liquid jetting phenomenon with the jet pointing in the direction of the propagating shock wave. With increasing bubble radius, the length of the jet tip increases and a lower estimate of the averaged jet velocity increases linearly from 20 to 150 m/s. At a later stage, the jet breaks up and releases...

2012
Alberto Vailati Luca Zinnato Roberto Cerbino

Archer fish knock down insects anchored to vegetation by hitting them with a precisely aimed jet of water. The striking force of the jet at the impact is such to overcome the strong anchoring forces of insects. The origin of the effectiveness of such hunting mechanism has been long searched for inside of the fish, in the unsuccessful attempt to identify internal structures dedicated to the ampl...

حجت الله دانشمند, , محمد ابراهیم زمردیان, , محمد رضا شعار ابوذری, , محمدرعایایی علی آبادی, , نیماقلعه, ,

  We report on an experimental comparison of the characteristics of quark-induced jets based on an analysis of jet events selected from hadronic events at c.m. energy of 60 GeV in e+e- annihilations. The triangle plot shows that the majority are two-jet events. The three-jet events are also present but not as many as two-jet events. The mean transverse momentum is larger for three-jet events th...

Foad Boavieh Heyderali Kashkooli Mohammad Heidarnejad,

This research aims to study jet downstream scour model under the influence of changes of water level. It also studies and analyzes different parameters and components of diffusion of submerged jet flow in an acceptor fluid and scour hole dimensions. To achieve the objectives, a physical model was made in proportion to the research title. With the Froude number increasing in a nozzle discharge, ...

1999
N. BROOK D. A. SUMMERS

The effect of pressure, stand-off distance and time on the penetration of sandstones by a 0.84 mm. jet of water was investigated. Pressures ranged up to 9000 lb/in 2 (62 MN/M), stand-off distances to 2 in. (5.08 cm) and time from 0.5 to 30 sec. The effect of using a friction reducing agent was determined. The advantages of allowing the spent jet to escape and not interfere with penetration are ...

2013
David Hess Christoph Brücker Franziska Hegner Alexander Balmert Horst Bleckmann

Snapping shrimp use one oversized claw to generate a cavitating high speed water jet for hunting, defence and communication. This work is an experimental investigation about the jet generation. Snapping shrimp (Alpheus-bellulus) were investigated by using an enlarged transparent model reproducing the closure of the snapper claw. Flow inside the model was studied using both High-Speed Particle I...

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