The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
M. Y. Ozkan - One of the best experts on this subject based on the ideXlab platform.
-
Measurement of ground borne vibrations for foundation design and vibration isolation of a high-Precision Instrument
Measurement: Journal of the International Measurement Confederation, 2016Co-Authors: D. Ulgen, Ozgur L Ertugrul, M. Y. OzkanAbstract:This study focuses on the foundation design and vibration isolation of a high-Precision Instrument subjected to ground-borne vibrations. The allowable vibration level for the proper operation of the sensitive equipment was 50 μg in a frequency range of 1–300 Hz. Prior to foundation design, first, an extensive field survey including geological and geophysical tests were performed in situ to obtain the static and dynamic physical properties of the soils. Next, vibration levels at various locations in the vicinity of moving vibration sources at the site were measured by accelerometers in one third octave frequency range from 1 Hz to 1000 Hz. Background vibration levels at the site were also measured while all of the vibration sources were inactive. Based on the measurements, a special foundation system was designed to reduce the vibration levels at the base of the Precision Instrument to allowable vibration limits while the vibration sources were active. Consequently, measurements were performed on the actual true scale foundation structure constructed at the site to assess the vibration isolation performance of specially designed structure. The actual vibration levels on top of the inertia mass show good agreement with the predicted values.
D. Ulgen - One of the best experts on this subject based on the ideXlab platform.
-
Measurement of ground borne vibrations for foundation design and vibration isolation of a high-Precision Instrument
Measurement: Journal of the International Measurement Confederation, 2016Co-Authors: D. Ulgen, Ozgur L Ertugrul, M. Y. OzkanAbstract:This study focuses on the foundation design and vibration isolation of a high-Precision Instrument subjected to ground-borne vibrations. The allowable vibration level for the proper operation of the sensitive equipment was 50 μg in a frequency range of 1–300 Hz. Prior to foundation design, first, an extensive field survey including geological and geophysical tests were performed in situ to obtain the static and dynamic physical properties of the soils. Next, vibration levels at various locations in the vicinity of moving vibration sources at the site were measured by accelerometers in one third octave frequency range from 1 Hz to 1000 Hz. Background vibration levels at the site were also measured while all of the vibration sources were inactive. Based on the measurements, a special foundation system was designed to reduce the vibration levels at the base of the Precision Instrument to allowable vibration limits while the vibration sources were active. Consequently, measurements were performed on the actual true scale foundation structure constructed at the site to assess the vibration isolation performance of specially designed structure. The actual vibration levels on top of the inertia mass show good agreement with the predicted values.
Xuesong Ye - One of the best experts on this subject based on the ideXlab platform.
-
a portable telemetry system for brain stimulation and neuronal activity recording in freely behaving small animals
Journal of Neuroscience Methods, 2008Co-Authors: Xuesong Ye, Peng Wang, Shaomin Zhang, Jun Jiang, Qingbo Wang, Weidong ChenAbstract:Abstract A portable multi-channel telemetry system which can be used for brain stimulation and neuronal activity recording in freely behaving small animals is described here. This system consists of three major components of headstage, backpack and portable Personal Digital Assistant (PDA). The headstage contains high Precision Instrument amplifiers with high input impedance. The backpack is comprised of two parts: (1) a main board (size: 36 mm × 22 mm × 3.5 mm and weight: 40 g with batteries, 20 g without), with current/voltage stimulator and special circuit suitable for neuronal activity recording and (2) and a bluetooth transceiver, with a high data transmission rate up to 70 kb/s, suitable for downloading stimulation commands and uploading acquired data. We recorded neuronal activities of the primary motor area of a freely behaving rat with 12-bit resolution at 12 k samples/s. The recorded data and analysis results showed that the system was successful by comparing with the commercial equipment Cerebus™ 128-Channel Data Acquisition System (Cyberkinetics Inc.). Using the PDA, we can control stimulation and recording. It provides a flexible method to do some research work in the circumstances where other approaches would be difficult or impossible.
Dan Imre - One of the best experts on this subject based on the ideXlab platform.
-
splat ii an aircraft compatible ultra sensitive high Precision Instrument for in situ characterization of the size and composition of fine and ultrafine particles
Aerosol Science and Technology, 2009Co-Authors: Alla Zelenyuk, Juan Yang, Eric Y Choi, Dan ImreAbstract:This article describes SPLAT II, a new aircraft compatible single particle mass spectrometer that provides significantly improved performance when compared with SPLAT, or any other existing single particle mass spectrometer. SPLAT II detects and characterizes 100% of spherical particles and ∼30% of aspherical particles with diameters between 125 nm and 600 nm. It also brings significant increase in temporal resolution, sizing over 500 particles per second, while characterizing the composition of up to 100 of them. The increase in sensitivity to small particles makes it possible, under most conditions, to use a differential mobility analyzer upfront SPLAT II in order to simultaneously measure in addition to individual particle size and composition, a number of other particle attributes, such as density or effective density, dynamic shape factor, fractal dimension, and even hygroscopicity. SPLAT II provides sizing Precision on the order of a monolayer, and makes it possible to distinguish between spherical ...
Rihong Zhu - One of the best experts on this subject based on the ideXlab platform.
-
Simulation study of Robust H Control system for the optical ultra-Precision vibration isolation system
The Proceedings of the Multiconference on "Computational Engineering in Systems Applications", 2006Co-Authors: Zhenyu Lu, Rihong ZhuAbstract:The hybrid control technology of the active vibration isolation and the passive vibration isolation is presented to solve the uncertainty of the optical ultra-Precision Instrument vibration isolation system. The active vibration isolation exploits the theory of Robust Hinfin, which overcome the uncertainty of model and the disturbance, and make the control system restrain the nonlinearity of the model and the disturbance of the vibration. The simulation results prove that this method has shown good robustness and control Precision in the vibration isolation of the optical ultra - Precision Instrument.