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Investigation of a set procedure for the stability of pressure control in the newly developed flow-control system at KRISS
MAPAN - Tập 24 - Trang 89-94 - 2009
Korea Research Institute of Standards and Science (KRISS) has assembled a new
flow-control system (FCS-705) for the study of advanced applications and
calibration of different types of vacuum gauges by comparison method. This
report details the measurement of the outgassing rate of the main vacuum chamber
by the pressure rate of rise method. Constant pressure was generated inside the
vacuum chambe...
A Broadband Microwave Metamaterial Absorber with Octave Bandwidth
MAPAN - Tập 31 - Trang 299-307 - 2016
In this paper, a broadband metamaterial absorber has been presented for
practical applications. The unit cell of the proposed structure comprises
metallic patch of single circular split-ring imprinted on top surface of a
metal-backed dielectric substrate. The geometrical dimensions of the structure
have been optimized in such a way that the structure exhibits broadband
absorptivity response of 9.1...
Improving the Measurement of Volume Fraction of Multiphase Fluids Based on Attenuation of Gamma Rays Without the Use of Artificial Intelligence
MAPAN - Tập 36 - Trang 869-874 - 2021
Nowadays, multiphase fluid flowmetry is of great importance in the industry. The
most important parameter required for multi-phase fluid flowmeter is the volume
fraction of each phase. In this study, three flow regimes (annular, stratified
and homogeneous) for two-phase (liquid–gas) as well as three-phase
(liquid–liquid–gas) to determine the volume fraction of phases with use
gamma-ray attenuation...
Measurement Uncertainty in Vibration Calibration in Frequency Range of 5 Hz to 10 kHz
MAPAN - Tập 35 - Trang 397-405 - 2020
The paper evaluates the measurement uncertainty in realizing the secondary
vibration standard at CSIR-National Physical Laboratory, India, and presents a
comparison of the measurement uncertainty of secondary standard with that of
primary vibration standard. The relative expanded measurement uncertainty of
0.80% to 2.2% in frequency range of 5 Hz to 10 kHz is evaluated. The measurement
uncertainty...
Design, Construction and Calibration of a Triaxial Dynamometer for Measuring Forces and Moments Applied on Tillage Implements in Field Conditions
MAPAN - Tập 28 - Trang 119-127 - 2013
In this research, a dynamometer was designed, constructed and calibrated to
measure the forces and moments applied on tillage implements. This dynamometer
is able to measure the three orthogonal forces acting on the implement and the
three moments acting around the orthogonal axes, up to a maximum force of 20 kN
and a maximum moment of 20 kN m. The dynamometer uses two extended octagonal
ring tran...
The uncertainty of parallel model coordinate measuring machine
MAPAN - Tập 26 - Trang 47-53 - 2011
The Stewart platform is one of 6-DOF (6 degrees of freedom) parallel mechanism.
A parallel mechanism is a mechanism to connect six actuators in parallel between
the base and the stage. It is necessary to calibrate the kinematic parameters
that compose the mechanism in order to use the parallel mechanism as the
coordinate measuring machine. Additionally, it is necessary to estimate the
uncertainty ...
Realization of Negative Gauge Pressure Standard in the National Metrology Institute of Indonesia
MAPAN - - 2019
Accurate negative gauge pressure measurement is the key factor for many
scientific and industrial applications such as clean room technology, medical
treatment, and pharmaceutical production. However, there are not much
publications regarding to the technical guide when it comes to negative pressure
measurement, although several comparison of negative gauge pressure has been
performed in Europe. I...
Design and Evaluation of a 100 kN m Multi-function Torque Standard Machine
MAPAN -
AbstractThis paper presents the design and evaluation of a Multi-function torque
standard machine (MFTSM) capable of calibrating hydraulic torque wrenches,
torque multipliers either concentric or nonconcentric up to 100 kN m, and torque
transducers with regular or irregular bases up to 2.5 kN m, in clockwise and
anticlockwise directions. The machine’s performance was evaluated through a
series of ...
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