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Radio frequency identification (RFID) system in the ultra-high frequency (UHF) band has gained much interest in several service industries, purchasing and distribution logistics, manufacturing companies and goods flow system [1]. The RFID system generally consists of the reader and the tag, and the UHF RFID system operates at the bands of North America(More)
A novel simplified miniature microstrip-fed square-ring patch antenna with CP radiation has been proposed and tested is presented in this paper. By observing the influence of various parameters on the antenna performance, it can be seen that any design parameter significantly affects the characteristic of CP radiation. The prototype has been designed and(More)
Berberine was used to determine inhibition of arylamine N-acetyltransferase (NAT) activity in human bladder tumour cells. The NAT activity was measured by HPLC assaying for the amounts of N-acetyl-2-aminofluorene (AAF) and N-acetyl-p-aminobenzoic acid (N-Ac-PABA) and remaining 2-aminofluorene (AF) and p-aminobenzoic acid (PABA). Two assay systems were(More)
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