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Study on thermoplastic cassava starch modifications via chemical, photo and irradiation induced crosslinking
No full textMaster of Science in Materials EngineeringThe characterization of modified thermoplastic starch (TPS) was investigated by means of
mechanical properties, thermal properties, scanning electron microscope (SEM), Fourier
transform infrared spectroscopy, high performance liquid chromatography and
biodegradability test. Before performing the modification, the TPS was prepared by
plasticized 65 % of native cassava starch with 35 % of glycerol. The TPS was prepared by
using heated two roll mill at the 150 oC for 10 minutes. Different type of modification,
which photo radiation, electron beam radiation crosslinking, and carboxylic acid
modification was prepared on TPS sheets. In photo crosslinking, TPS were irradiated under
lamps at different irradiation time, from 30 minutes to 480 minutes. Meanwhile, dosage
ranging from 25 kGy to 100 kGy were introduced in electron beam radiation crosslinking
process. Crosslinking of TPS using photo radiation and electron beam radiation showed
improved thermal properties and mechanical properties, which 2.70 MPa and 3.18 MPa
respectively. The gel mass (NGM) value increases up to 22.98 mg/cm2 and 19.28 mg/cm2,
respected to the photo irradiation time and electron dose range proved the formation of
crosslinking in the TPS. However, excessive irradiation caused further degradation of the
TPS, thus reduce the crosslinking formation. Citric acid and ascorbic acid were introduced
into the chemical modification process of TPS. Addition of carboxylic acid were varied
from 1% - 4%, and 10% - 50%. Based on SEM analysis, the addition of carboxylic acid
gives a smoother fracture surface. Further increment in carboxylic acid content led to the
crosslinking formation. The NGM value was increase until 49.00 mg/cm2 and 57.43
mg/cm2, respected to increases of citric acid and ascorbic acid content. As a resulted, the
tensile value at 40% was increased up to 6.25 MPa compared to unmodified TPS. Moisture
absorption analysis also showed improved moisture resistivity as compared to unmodified
TPS. Biodegradability test performed resulted acid modification TPS give low degradation
rate compared to unmodified TPS. These was due to their improved moisture resistivity,
resulted reduce in the water permeability into the TPS structur
COVID-19 Pandemic and E-Banking in Nigeria
No full textLink to publisher's homepage at https://ijbt.unimap.edu.myThe COVID-19 pandemic and technology have redefined the channels through which business and financial transactions can be carried out. The objective of the study is to assess the connectivity between COVID-19 and electronic banking (E-Banking) during the periods of COVID-19 lockdown and the restriction of movement in Nigeria. Ex post facto research design and secondary data were used in the study. The study adopted descriptive analysis as its data analysis method. It was found that online transfer channels were mostly used throughout the periods of COVID-19 and the restriction of movement in Nigeria, and the volume of transactions for all the components of E-Banking (automated teller machines, point of sale transfer, online transfer, and USSD transfer) were low in the month of April compared to other months in the periods of study. The study concluded that COVID-19 increased the online transfer channel of E-Banking in Nigeria during COVID-19 lockdown and the restriction of movement in the year 2020. The study recommended that financial transactions via E-Banking be encouraged in Nigeria, in as much as COVID-19 still persists there. Also, there should be a reduction in the service charges as charged by the banks, telecommunications firms, and the Federal Government on the use of E-Banking for fund transfers in order to encourage more Nigerians to adopt E-Banking
Temperature effects on the optical properties of bismuth nanoparticles prepared by PLAL for antibacterial activity
Full text linkLink to publisher's homepage at http://ijneam.unimap.edu.my/Bismuth nanoparticles (Bi NPs) constitute a promising technology for combating infectious
illnesses and bacterial resistance to antibacterial treatments. Bi NPs were synthesized by
Pulsed Laser Ablation in Liquid (PLAL) using a 532 nm second-harmonic generation Nd:YAG
laser. Bi NPs samples were prepared in 10, 35, 50, 75, and 90 ˚C water for various laser
energies and number of laser pulses. Ultraviolet-visible (UV-Vis) spectra measurements
revealed a characteristic plasmonic absorption band indicative of metallic bismuth nanosized
particles. Field emission scanning electron microscopy (FESEM) analysis showed that
the water temperature during the ablation process affected the size and morphology of Bi
NPs. The average Bi NP size at 60 ˚C was 28 nm, considerably smaller than the 55 nm average
observed at 10 ˚C. The antimicrobial properties of Bi NPs against two opportunistic
pathogens, E. coli and S. aureus, were assessed. For S. aureus, the inhibition zone of Bi NPs
prepared at 60 ˚C was greater than that of samples prepared at 10 ˚C. Further, Bi NPs
exhibited lower potency against E. coli than S. aureus in both samples
UniMAP mendapat tempat Ke-11 di kalangan 367 Universiti Malaysia yang disenaraikan dalam penarafan Webometrics, edisi Januari 2023
Full text linkLink to publisher homepage at https://www.unimap.edu.my/Berdasarkan keputusan penarafan Webometrics pada Edisi
Januari 2023, Universiti Malaysia Perlis (UniMAP) berada di kedudukan ke-11 dalam
kalangan 367 universiti Malaysia yang disenaraikan oleh Webometrics Ranking of World
Universities (WRWU). Tahniah diucapkan kepada UniMAP kerana telah meningkatkan
kedudukan peringkat dunia daripada tangga ke-1575 kepada tangga ke-1405 dan
kedudukan peringkat Malaysia daripada tangga ke-15 kepada tangga ke-11.
(Sumber: https://www.webometrics.info/en/Asia/Malaysia%2
