Browsing Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์ by Issue Date
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A study of monthly average daily global solar radiation from measuring stations in Thailand
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 1/7/2022)Monthly average daily global solar radiation data are very important for designing and evaluating of the performance the solar energy technologies, which require long-term solar radiation data. Therefore, this study aims ... -
A study of net radiation from data collected at Nakhon Pathom meteorological station
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 1/7/2022)In this work, the net radiation was measured by using a net radiometer (Kipp&Zonen: CNR4) located at Kamphaeng Saen district, Nakhon Pathom, Thailand. Five-year period (2017-2021) of the net radiation data from this ... -
A study of the effect of diffuse solar radiation on the performance of a parabola dome solar dryer
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 1/7/2022)The objective of this research is to study the effect of diffuse solar radiation on the parabola dome solar dryer using mathematical modeling. The model is based on heat transfer equations which consider the thermophysical ... -
A study of solar ultraviolet radiation under clear sky condition measured at stations situated in main regions of Thailand
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/6/2020)In this study, global and diffuse solar erythemal ultraviolet radiation under clear sky condition measured at stations localed in main regions of Thailand was analysed. These stations are Chiang Mai (18.78 °N, 98.98 °E) ... -
A development of a model for calculating global solar illuminance using Himawari satellite data
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/6/2020)In this research work, a model for calculating monthly average hourly global illuminance from Himawari satellite data was developed. A 3-year period (2016-2018) of data form the visible channel (0.51 m) of Himawari satellite ... -
A study of solar radiation spectrum from data collected at Nakhon Pathom station
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/6/2020)In this work, the performance of three direct solar spectral models under clear sky condition and three diffuse solar spectral model under clear sky condition were investigated. The spectral values calculated from the model ... -
Physical and magnetic characterization of magnetic force microscopy tips
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)A conventional magnetic force microscopy (MFM) technique is usually employed to image magnetic domains and patterns of ferromagnetic materials. This requires MFM probes that have an ultrahigh resolution for imaging small ... -
Analysis of Wide Area Adjacent Track Erasure in Magnetic Write Heads using Magnetic Force Microscopy
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)Wide area adjacent track erasure (WATEr) is one of significant problems limiting the performance of magnetic write heads. This problem leads to the stored data near and also far from a written track being erased. Typically, ... -
Apparatus for measuring frequency and magnetic response of magnetic force microscopy probes
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)Characterization and inspection of magnetic force microscopy (MFM) probes are generally done in a conventional atomic force microscope (AFM) with a patterned magnetic recording media as a test sample. During the characterization, ... -
A Study of Spectral Solar Radiation Models under cloudless skies
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)Comparisons of the models for estimating direct-beam and diffuse horizontal solar spectral irradiances under cloudless sky conditions were examined with the direct-beam and diffuse horizontal solar spectral irradiances ... -
A Preliminary Study of Atmospheric Water Vapour in Thailand
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)In this work, a preliminary study of atmospheric water vapour in Thailand was carried out. The work consists of two parts. The first part was the development of a model for estimating precipitable water and the second ... -
Micromagnetic Simulations of Exchange Coupled Composite Media
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)In this thesis, micromagnetic simulations of exchange coupled composite (ECC) media were employed aiming to study the motion of magnetic moments inside the ECC media and the M-H hysteresis loops. The simulations were ... -
Micromagnetic study of pole tip remanance in perpendicular magnetic recording heads
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)In this thesis, the pole-tip remanence in magnetic write heads, which is one of significant problems in perpendicular magnetic recording, was studied using the open source micromagnetic simulation, object oriented ... -
Finite element simulations of a magnetic write head with different magnetic shield designs
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)Perpendicular magnetic write heads used in hard disk drive applications was generally composed of a main write pole surrounded by magnetic shields in order to reduce the fringing field expansion and thus improve area storage ... -
A study of remnant field of magnetic write heads using magnetic force microscopy
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)One of main problems in manufacturing a perpendicular magnetic recording head is the write head remanence, which is the remaining out-of-plane magnetic field on the magnetic write head. The remnant field can write unwanted ... -
characterization of magnetic write heads using a high-frequency magnetic force microscope
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)High-frequency magnetic force microscope (HF-MFM) was used to characterize perpendicular magnetic write heads in this thesis. The operation of the HF-MFM was similar to that of a conventional MFM technique, excepting that ... -
Development of statistical models for converting values of solar diffuse radiation from sky on horizontal plane to those of diffuse radiation on inclined planes using solar radiation data from 4 stations in Thailand
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)In this work, models for converting values of diffuse solar radiation on horizontal plane into those on tilted planes with various tilted angles and sky conditions. Values of diffuse solar radiation on tilted plans were ... -
Development of a model for calculating sky radiance under cloudless skies with the aerosol effect
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)In this research work, a statistical model for calculating sky radiance under cloudless sky condition was developed. The proposed model is a multiplication of two functions namely gradation function and indicatrix function. ... -
A study of optical properties of aerosols at Lopburi province by using a spectroradiometer modified for measuring spectral direct radiation
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)In this work, a spectroradiometer for measuring spectral global solar radiation was modified by covering its glass dome with a collimator to allow direct radiation to be incident on the sensor of this instrument. Then this ... -
Preliminary development of low-cost instrument for measuring solar ultraviolet radiation.
Collection: Theses (Master's degree) - Physics / วิทยานิพนธ์ – ฟิสิกส์Type: Thesis(Silpakorn University, 12/7/2019)In this work, a low-cost and modirately, accurate portable device for measuring solar ultraviolet radiation (UV) was developed at Silpakorn University in Nakhon Pathom (13.82ºN, 100.04ºE). The aim of the development of ...