Results 61 to 70 of about 1,545,476 (276)

The development of an ultrasonic Doppler bed-load velocimeter [PDF]

, 1989
Includes bibliography.A instrument has been developed for measuring the velocity of solid particles adjacent to the pipe wall in a solids-liquid pipeline.
Lazarus, Mark Doron
core   +1 more source

Methodology for Determining the Correct Ultrasonic Pulse Velocity in Concrete

Buildings
Quite often, concrete strength parameters must be determined in the shortest possible time. Due to the strong correlation between concrete’s mechanical and acoustic properties, ultrasonic devices can be used for this purpose. However, the ultrasonic pulse velocity (UPV) is influenced by a variety of factors, including the curing and exploitation ...
Uldis Lencis, Aigars Udris, Patricia Kara De Maeijer, Aleksandrs Korjakins   +3 more
openaire   +3 more sources

Investigation of Concrete Segregation by Ultrasonic Pulse Velocity

Journal of Architectural Engineering Technology, 2017
Segregation is the separation of the components of fresh concrete or mortar, which can be caused by bad proportioning, insufficient mixing or excessive vibration. There are several tests which can be measured on hardened concrete or at the beginning of hardening. These are generally based on the percentage of the Fine aggregates between the top and the
Grini Abdelouaheb, Benouis Abdelhalim
openaire   +1 more source

Nanoscale Spatial Tuning of Superconductivity in Cuprate Thin Films via Direct Laser Writing

Advanced Functional Materials, EarlyView.
Maskless direct laser writing enables local control of oxygen stoichiometry in epitaxial YBCO thin films under ambient conditions. Sub‐micrometer grayscale patterns with tunable optical response and superconducting transport properties are achieved.
Irene Biancardi, Valerio Levati, Jordi Alcalà, Thomas Günkel, Nicolas Lejeune, Riccardo Girelli, Alejandro V. Silhanek, Valeria Russo, Narcís Mestres, Daniela Petti, Anna Palau, Edoardo Albisetti   +11 more
wiley   +1 more source

Evaluation of Compressive Strength by Non- Destructive Test Using Ultrasonic Pulse Velocity With Maximum Size Aggregate (10 And 20)mm

Journal of Engineering and Sustainable Development, 2014
The concrete is tested non destructively to determine its mechanical properties (compressive strength) which is considered as the main property and the parameter used in its evaluation.
Laith A. Al-jaberi, Asmaa Mahdi Ali
doaj  

Analysis of the Stress-Strain State of operated reinforced Concrete Structures Using Ultrasound

Вестник Дагестанского государственного технического университета: Технические науки
Objective. Research and analysis of parameters of the stress-strain state of reinforced concrete beams using periodic ultrasonic testing in compressed and tensile zones and development of proposals for the application of the method in the inspection and ...
G. V. Nesvetaev, A. V. Kolleganov, N. A. Kolleganov, A. N. Ivlev, A. M. Omarov   +4 more
doaj   +1 more source

Tailoring Light Management in All‐Perovskite Tandem Solar Cells: The Impact of Nanotextures

Advanced Functional Materials, EarlyView.
To further improve the power conversion efficiency of all‐perovskite tandem solar cells, light management strategies need to be implemented. Front‐sided nanotextures reduce reflection losses, which boosts light absorption, thus increasing the tandem JSC, which is further supported by reducing parasitic absorption.
Sebastian Berwig, Yeonghun Yun, Doyun Im, Isabella Taupitz, Alexandros Cruz, Marlene Härtel, Bor Li, Kevin J. Prince, Hanifah Winarto, Thomas W. Gries, Klaus Jäger, Florian Riesebeck, Daniele Mantione, Sharon Monaci, Silvia Mariotti, Vishnu Vijayakumar, René A. J. Janssen, Sangwook Lee, Bernd Stannowski, Christiane Becker, Philipp Tockhorn, Steve Albrecht   +21 more
wiley   +1 more source

Estimativa da resistência do concreto à compressão por meio da velocidade de propagação dos pulsos ultrassônicos na pasta do concreto [PDF]

, 2012
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia CivilEsse trabalho propõe um procedimento alternativo para a estimativa da resistência à compressão do concreto através do método da ...
Irrigaray, Mário Arlindo Paz
core  

Influence of Ultrasonic Treatment on the Sedimentation Performance of Slime

Kuangchan zonghe liyong
This is an article in the field of mining engineering. Kaolinite and montmorillonite are the main clay minerals in coal slime, and clay minerals are the main factors affecting the sedimentation of coal slime.
Xiaobin ZHANG, Xin WEN, Weiwei CAO, Zhongshan LI, Jing TAN   +4 more
doaj   +1 more source

The assessment of concrete quality by ultrasonic pulse velocity

Journal of Science and Technology in Civil Engineering (STCE) - NUCE, 2018
In the present study, the uniformity and potential internal defects of concrete elements in situ were assessed by using Ultrasonic Pulse Velocity (UPV) testing method according to TCVN 9357:2012. Thirteen cross beams with dimension of 4.8 x 1.5 x 1.5 m3 were selected to measure the pulse velocity. Three cross beams were used to check potential internal
openaire   +2 more sources