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Item type:Publication, Evaluation of Interface Shear Strength Coefficient of Alternative Geogrid Made from Para Rubber Sheet(2023-04-01)1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A Review of the Parameters Related to the Rubber Sheets Production: Major Constituents of Rubber Latex, Rubber Particles, Particle Interaction of Rubber Latex, Rubber Porous Structure, Rubber Drying Kinetics and Energy Consumption(2023-01-01); ; ; Taweekun, JuntakanNatural rubber (NR) is obtained principally from Para-rubber trees of the species Hevea brasiliensis which grow in tropical regions. Using ultra-centrifugation method, fresh latex (FL) from Para-rubber trees can be mainly divided into four fractions; an upper white layer consists of rubber particles, Frey-Wyssling particles in a yellow or an orange layer, C-serum phase and lutiods particles in the bottom fraction [1-3]. The averages of rubber particles have diameters of 0.02 to 3.0 micron, and they are protected by a complex film containing lipids and proteins [4-8]. The main forces of attraction between neighboring rubber particles in latex system can be divided into five force types; Structural Forces (SF), Van der Waals Interaction (VWI), Electrostatic Force (EF), Exclusion Interaction (EI) and Polymer-Polymer Interaction (PPI) [9]. The porous model of rubber structure used to describe moisture transfer was based on the existence of two different regions referred to as non-hygroscopic region and hygroscopic region. The rubber products drying always produced a considerable shrinkage effect which considered in the physical of the product, such as the diffusion coefficient, mass and heat transfer. An initial moisture content of raw material, the experimental temperature and the drying equipment had affect to the EMC isotherms and the drying kinetics. Finally, discussions on the implications of the results for strategies to reduce the energy consumption in RSS and STR20 block rubber are also presented.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Natural Para Rubber in Road Embankment Stabilization(2022-02-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, WLAN Localization Measurement and Analysis Using RSS and TOA Positioning Methods(2018-07-02); Wireless local area network (WLAN) has been exclusively research due to its widely used applications. Its operate frequency spectrum is in the ISM band and regulated in IEEE 802.11 family. Localization is one of the application which able to used WLAN signal. Its can be used in various applications such as logistics, security, disaster rescue operation tracking, and military service. Since the various kind of its applications is work in indoor environment, the indoor localization requires high accuracy. The receive signal strength (RSS) and time of arrival (TOA) are a parameter that used in the comparison between min-max technique and trilateration technique in this paper. In the measurement of this research, the frequency bandwidth is ranging from 2.3 GHz to 2.5 GHz, an access point is used to represent both of transmit antenna and receive antenna. The cumulative distribution function (CDF) is used for study the most accuracy.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, UWB transmission measurement and modeling for indoor localization(2017-02-21); Southisombat, PhonepaseuthThe UWB is one wireless technology for indoor localization has been extensively researched in short range system because of its various applications. It can be used in firefighters tracking, logistics and military service. This system requires high accuracy in an indoor environment. In this paper evaluate and comparison between Trilateration and Min-Max localization techniques using received signal strength (RSS) and time of arrival (TOA) parameters. This study based on the ultra-wideband (UWB) transmission model for an indoor localization. The vector network analyzer (VNA) was used to measurement and recorders at FCC frequency band from 3.1 GHz to 10.6 GHz. Using the biconical antennas were used as both transmitter (Tx) and receiver (Rx) antennas. The accuracy and precision are also studies in the term of distance error. The cumulative distribution function (CDF) of distance error of each case is shown. From the results, the trilateration technique using TOA parameters very good accuracy. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of ultra wideband indoor localization with trilateration and min-max techniques(2016-09-06); Kingsakda, VongkeoUWB indoor localization has been extensively researched because of its various applications. It can be used in firefighters tracking, logistics and military service. This system requires high accuracy in an indoor environment. In this paper the comparison between trilateration and min-max localization techniques using received signal strength (RSS) and time of arrival (TOA) parameters. This study based on the indoor localization using ultra wideband (UWB) transmission model. The vector network analyzer (VNA) was used to measure at the frequency ranging from 3 GHz to 11 GHz. The biconical antennas were used as both transmitter (Tx) and receiver (Rx) antennas. The accuracy and precision are also studies in the term of distance error. The cumulative distribution function (CDF) of distance error of each case is shown. From the results, the trilateration technique using TOA parameter has the most accuracy.