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  • Investigation of Different Compression Apparatus Usage Effects in Calibration Process of Strain Cylinders
    MAPAN (IF 1.25) Pub Date : 2020-05-12
    Haldun Dİzdar, Bülent Aydemİr, Cemal Vatan

    In this article, in calibration process of strain cylinder, which is performed according to ISO 376 standard, effect of loading apparatus with different dimensions on measurement result has been investigated. In addition, relative repeatability error of calibration on measurement results, temperature fluctuation, accuracy error of measurements, creep error, as well as the stability and metrological

    更新日期:2020-05-12
  • Prediction of Liquid Density by Gamma-Ray Measurement for Materials with Low Atomic Number
    MAPAN (IF 1.25) Pub Date : 2020-05-12
    S. M. Golgoun, D. Sardari, M. Sadeghi, F. Babapour Mofrad

    A new method has been developed and evaluated for density measurement of liquid materials based on conventional gamma density meter, whether a low strength gamma radioactive source as the backscatter technique with collimated detector cannot be properly used for density measurement. In this comparative study, proposed method aimed to improve the linearity of the density measurement without using time

    更新日期:2020-05-12
  • Modelling Accumulation of Respiratory-CO 2 in Closed Rooms Leading to Decision-Making on Room Occupancy
    MAPAN (IF 1.25) Pub Date : 2020-05-08
    Deepanjan Majumdar, Santanu Chatterjee

    A model predicting time required to attain undesired levels of respiratory-CO2 in closed rooms is described. The model works under the following assumptions: (1) room air is well-mixed, (2) indoor CO2 does not exchange with outdoor CO2, (3) there is no effect of individual occupants on CO2 exhalation rate of other occupants, (4) there is no indoor CO2 sink and all exhaled CO2 end up increasing CO2

    更新日期:2020-05-08
  • Prediction of In-Orbit Power on Time for Transformer Based on Gas Permeation Analysis of the Seal Cavity
    MAPAN (IF 1.25) Pub Date : 2020-03-24
    Lian Chen, Ya-li Li, Wen-jun Sun, Meng Dong, Tian-you Feng, Lan Zhao, Dong Ding, Yong-jun Cheng

    The gas permeability of solid material is one of the important factors affecting pressure change properties of seal products. In this article, the pressure change analysis based on gas permeation and material outgassing principle of the seal cavity for satellite in-orbit is carried out. Through establishing the pressure change model of the seal cavity, analyzing the gas permeation of the encapsulating

    更新日期:2020-04-23
  • A Review of Air Quality Modeling
    MAPAN (IF 1.25) Pub Date : 2020-03-20
    Khaoula Karroum, Yijun Lin, Yao-Yi Chiang, Yann Ben Maissa, Mohamed El Haziti, Anton Sokolov, Hervé Delbarre

    Air quality models (AQMs) are useful for studying various types of air pollutions and provide the possibility to reveal the contributors of air pollutants. Existing AQMs have been used in many scenarios having a variety of goals, e.g., focusing on some study areas and specific spatial units. Previous AQM reviews typically cover one of the forming elements of AQMs. In this review, we identify the role

    更新日期:2020-04-23
  • Systematic Characterization of Near-Index-Matched Optics Based Atmospheric Turbulence Simulator
    MAPAN (IF 1.25) Pub Date : 2020-03-11
    Awakash Dixit, Vikash Porwal, Ajay Kumar, Sanjay Kumar Mishra

    In the present communication, a systematic characterization of atmospheric turbulence simulator (ATS) based on near-index-matched optics is reported. Characteristics of the propagating laser beam in actual turbulence can be realized in the laboratory by employing such types of turbulence simulators. Such simulators are necessarily required to evaluate the performance of an adaptive optics sensor and

    更新日期:2020-04-23
  • Need of Alcohol Reference Materials and Reliable Measurement of Alcohol Content by Breath Alcohol Analyzer in India: An Overview
    MAPAN (IF 1.25) Pub Date : 2019-11-25
    S. Swarupa Tripathy, Swati Gupta, Divya Mishra, Praveen Kumar Yadav, Sunita Raina, Rajiv K. Saxena, Niranjan Singh, Nahar Singh, Monika J. Kulshrestha, V. N. Ojha, R. K. Kotnala

    Breath alcohol analyser is used to detect alcohol content in end-expiratory breaths in order to enforce driving regulations under the influence of alcohol legislation. The accuracy and reliability of the routine measurements of alcohol content performed with breath alcohol analyser can be achieved by the calibration of the breath alcohol analyser using standards traceable to SI reference material.

    更新日期:2020-04-23
  • Redefined SI Units and Their Implications
    MAPAN (IF 1.25) Pub Date : 2020-02-25
    Sanjay Yadav, D. K. Aswal

    Metrology plays the key role as the engine of industrial revolution and growth of any country. It promotes global competence and confidence. With the advent of better quality products through metrological advancement, our industries can compete internationally and to overcome trade barriers/constraints and finally to achieve exports targets. This translates into growth of industries through rapid industrialization

    更新日期:2020-04-23
  • An Automated Calibration System for Blood Pressure Measurement Traceability
    MAPAN (IF 1.25) Pub Date : 2019-06-20
    B. A. Rodrigues Filho, R. F. Farias, W. E. dos Anjos

    The present study proposes an automated system to calibrate the measurement standards used for blood pressure traceability. Sphygmomanometers are the main devices used for noninvasive blood pressure measurement and are periodically verified in order to maintain their metrological characteristics. The verification is conducted using a working standard as reference. The calibration of those standards

    更新日期:2020-04-23
  • Modified Calibration Coefficients of Two-Port CPW Standards with Superstrate Effects
    MAPAN (IF 1.25) Pub Date : 2019-09-24
    Kamlesh Patel, Paramjeet Singh, Sandhya M. Patel, V. N. Ojha

    Calibration standards are used for the calibration of a vector network analyzer to characterize the microwave components under test. For the direct characterization of coplanar waveguide components, two-port CPW open, short and line are proposed to complement the existing calibration techniques. The developed CPW standards are characterized in the frequency range of 10 MHz to 10 GHz. As these are planar

    更新日期:2020-04-23
  • Accuracy Estimation of Propagation Velocity in Variable Path Ultrasonic Interferometer for Liquids
    MAPAN (IF 1.25) Pub Date : 2019-07-30
    Sahil Sharma, Ujjwal Kumar Mishra, Arvind Kumar Saini, P. K. Dubey

    In this article, we describe the effects and the degree to which they cause error in the measurement of propagation velocity. Various effects include nonlinearity in path measurement, temperature stability and number of maxima or minima consideration. Double-distilled water was used as a sample to estimate various effects. Finally, it has been concluded that the variable frequency approach may be preferred

    更新日期:2020-04-23
  • Technical Evaluation and Optimization of Phasor Measurement Unit Using CSIR-NPL PMU Calibrator System to Ensure Reliability
    MAPAN (IF 1.25) Pub Date : 2019-09-13
    Anish Bhargav, Saood Ahmad, Swati Kumari, Archana Sahu, Sunidhi Luthra, Anurag Gupta

    The technological enhancements and new startups in India have led to a tremendous increase in the power demand. The grids are being made smart, more efficient and reliable to meet not only the growing energy demands but also to prevent blackouts. The synchrophasor technology is evolving, explored and used by the power sectors for real-time measurements with phasor measurement unit (PMU) as the main

    更新日期:2020-04-23
  • Adapted Technique for Calibrating Voltage Dividers of AC High-Voltage Measuring Systems
    MAPAN (IF 1.25) Pub Date : 2019-09-03
    Hala M. Abdel Mageed, Rehab S. Salah Eldeen

    This paper presents an adapted technique to calibrate the AC voltage divider of AC high-voltage measuring systems up to 200 kV at the Egyptian National Institute of Standards. Two identical capacitors have been used as two similar AC high-voltage capacitive dividers. Firstly, the dividing ratios of two capacitors have been achieved by calibrating each capacitor via a traceable reference standard AC

    更新日期:2020-04-23
  • Long-Term Measurements of SO 2 Over Delhi, India
    MAPAN (IF 1.25) Pub Date : 2019-11-05
    Jagriti Suneja, Garima Kotnala, Amarjeet Kaur, T. K. Mandal, S. K. Sharma

    Long-term measurements (2011–2018) of ambient sulphur dioxide (SO2) and meteorology were carried out at an urban site of Delhi, India, to study the seasonal and inter-annual variations of SO2 over Delhi. The average mixing ratio of SO2 was estimated as 2.26 ± 0.48 ppb for the entire study period. Mixing ratio of ambient SO2 was estimated as 2.19 ± 0.64 ppb, 2.07 ± 0.89 ppb, 2.49 ± 1.05 ppb and 2.27 ± 0

    更新日期:2020-04-23
  • Development of Decibel Stepped Attenuator for Automated Sound Level Meter Calibration
    MAPAN (IF 1.25) Pub Date : 2019-08-05
    Denny Hermawanto, Chery Chaen Putri, Bondan Dwisetyo, Ninuk Ragil Prasasti, Maharani Ratna Palupi, Dodi Rusjadi

    Parameter testing in the sound level meter calibration, such as frequency weighting and linearity, needs precise adjustment of sound level in the decibel (dB) unit. In the previous calibration setup, a hardware-based sound attenuator instrument was used as the complementary to a signal generator instrument system where the adjustment of sound using the attenuator was performed manually by the operator

    更新日期:2020-04-23
  • Geochemical, stable isotopic, palynological characterization of surface dry soils and atmospheric particles over Jodhpur city (Thar Desert, Rajasthan) during peak summer of 2013
    MAPAN (IF 1.25) Pub Date : 2019-08-27
    Rajesh Agnihotri, Ravi Sawlani, M. M. Azam, S. K. Basumatary, C. Sharma, S. K. Mishra, Rajeev Kumar, T. Narayanan, J. S. Rathore, Jayant Tripathi

    Atmospheric dust originating from the Thar Desert (India) acts as the local source of mineral dust in South Asia, spreading over an area of 0.32 × 106 km2. Regional studies conducted during peak boreal summer are required to characterize this mineral dust that blows in form of episodic dust storms towards Indo-Gangetic Plains (IGP), using a multi-tracer approach. To achieve this goal, atmospheric PM10

    更新日期:2020-04-23
  • Harmonic Parameter Online Estimation in Power System Based on Hann Self-Convolving Window and Equidistant Two-Point Interpolated DFT
    MAPAN (IF 1.25) Pub Date : 2019-09-26
    Yanchun Xu, Yufei Du, Zhenxing Li, Lei Xi, Yulong Liu

    A revised interpolated DFT is proposed to estimate the harmonic parameters accurately. Firstly, a 4-order Hann self-convolving window is employed to restrain the interferences caused by spectral leakage and sidelobes. The corresponding error can be restrained at a degree of 10−15 theoretically. Then, an equidistant two-point interpolated formula is proposed to deal with the picket-fence effect. It

    更新日期:2020-04-23
  • Investigation of 1 GPa Controlled Clearance Piston Gauge Using Finite Element Analysis
    MAPAN (IF 1.25) Pub Date : 2020-01-14
    Rudi Anggoro Samodro, In-Mook Choi, Sam-Yong Woo

    A one GPa controlled clearance piston gauge used as a high pressure standard at KRISS was investigated. In establishing the high pressure standard, the distortion coefficient is one of the most important parameters, but it is not easy to determine. The conventional analysis using a Heydemann–Welch model has a problem when determining a stall pressure, because of the nonlinear characteristic of fall

    更新日期:2020-04-23
  • Realization of Negative Gauge Pressure Standard in the National Metrology Institute of Indonesia
    MAPAN (IF 1.25) Pub Date : 2019-06-20
    Adindra Vickar Ega, Gigin Ginanjar, R. Rudi Anggoro Samodro

    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. In

    更新日期:2020-04-23
  • Comparative Assessment of Ambient Air Quality of Major Cities of Pakistan
    MAPAN (IF 1.25) Pub Date : 2019-09-24
    Amtul B. Tabinda, Haider Ali, Abdullah Yasar, Rizwan Rasheed, Adeel Mahmood, Anum Iqbal

    The deterioration of ambient air quality is one of the emerging environmental problems in developing countries of South Asia. Unplanned urbanization, population growth, degradation of vegetation cover and industrial and vehicular emissions, particularly in urban areas, have resulted in substantial rise in the level of air pollutants and emission sources. This study focused on monitoring of different

    更新日期:2020-04-23
  • Uncertainty Assessment in Cognitive Load for Multiple Object Tracking Based on EEG
    MAPAN (IF 1.25) Pub Date : 2019-09-03
    Ashish Aggarwal, Ravinder Agarwal

    Cognitive load varies the attention level, which has serious consequences in complex dynamic situations. Assessment of uncertainty in cognitive load during multiple object tracking task is necessary, as it is used to improve the cognitive capabilities. The present research work investigates the uncertainty in cognitive load of multiple object tracking task using electroencephalograph (EEG) on 25 football

    更新日期:2020-04-23
  • Development of Remote Wireless Environmental Conditions Measurement, Monitoring and Recording Device for Metrological and Other Scientific Applications
    MAPAN (IF 1.25) Pub Date : 2020-02-20
    Rahul Kumar, P. K. Dubey, Afaqul Zafer, Ashok Kumar, Sanjay Yadav

    Measurement, monitoring and recording of the environmental condition is the essential and sometimes statutory requirements, to observe the small change or deviation in the results of measurements in calibration and testing laboratories as well as other scientific applications. This motivated the authors to develop a precision wireless environment conditions, measurement, monitoring and recording (WEMMR)

    更新日期:2020-04-23
  • 3D Laser Scanning Pointcloud Processing Uncertainty Estimation for Fuel Tank Volume Calibration
    MAPAN (IF 1.25) Pub Date : 2020-02-11
    Mindaugas Knyva, Vytautas Knyva, Asta Meškuotienė, Pranas Kuzas, Darius Gailius, Žilvinas Nakutis

    The implementation of modern 3D scanning method for horizontal fuel tanks’ calibration applications proposes versatility and advantages over the currently used volumetric method which requires using of liquid filler (in most cases water, and in some countries—gasoline). However, the data scatter in the 3D pointcloud deteriorates the accuracy of the volume calculation algorithm output and therefore

    更新日期:2020-04-23
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