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Wan Fazilah Fazlil Ilahi,Desa Ahmad,Mohammud Che Husain 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.1
Growing temperate vegetable crops such as lettuce in the humid tropical climate of lowland Malaysia commonlyresults in heat-induced crop damage, delayed heading, and precocious bolting. Manipulating the root zone to a coolertemperature may alleviate plant damage caused by high ambient temperatures to a large extent. In this study, the effects of rootzone cooling (RZC) on the growth and development of butterhead lettuce were studied in a containerized planting systemcontaining a 3:1 coir-perlite mixture. Polyvinyl chloride (PVC) pipes were used to circulate cold water and cool the root zoneof the experimental plants, while their shoots were exposed to the hot ambient temperature. The temperature of the root zonewas measured at different depths (50 mm, 100 mm, 150 mm, and 200 mm from the surface of the media). The butterheadlettuce canopy diameter and number of leaves were significantly higher in the RZC treatment at the end of the growth stagecompared to the control plants, and the yield, as measured by the shoot and root dry weight, as well as the root/total biomassratio were also improved. The cooling pipes placed 100 mm below the surface provided a better growth condition forbutterhead lettuce; at 100 mm, the RZC media had a mean daily temperature of 19°C and a minimum temperature of 14.4°C at18:00. This study demonstrated the importance of optimizing root temperature for butterhead lettuce in an ambient hot tropicalclimate.
Design and Verification of Improved Cascaded Multilevel Inverter Topology with Asymmetric DC Sources
Tarmizi Tarmizi,Soib Taib,M. K. Mat Desa 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
This paper presents the design and implementation of an improved cascaded multilevel inverter topology with asymmetric DC sources. This experimental inverter topology is a stand-alone system with simulations and experiments performed using resistance loads. The topology uses four asymmetric binary DC sources that are independent from each other and one H-bridge. The topology was simulated using PSIM software before an actual prototype circuit was tested. The proposed topology was shown to be very efficient. It was able to generate a smooth output waveform up to 31 levels with only eight switches. The obtained simulation and experimental results are almost identical. In a 1,200W (48.3) resistive load application, the THDv and efficiency of the topology were found to be 1.7% and 97%, respectively. In inductive load applications, the THDv values were 1.1% and 1.3% for an inductive load (R=54 dan L=146mH) and a 36W fluorescent lamp load with a capacitor connected at the dc bus.
Atefeh Seyyedan,Farhana Yahya,Mohammad Fauzi Fahmi Kamarolzaman,Zarizal Suhaili,Mohd Nasir Mohd Desa,Hussain Mohd Khairi,Muhammad Nazrul Somchit,Corazon Abdullah Fatimah,Lay Kek Teh,Mohd Zaki Salleh,Z 셀메드 세포교정의약학회 2013 TANG Vol.3 No.3
Piper sarmentosum is a creeping herb belongs to the family of Piperaceae. It is locally known to the Malays as ‘Pokok kadok’ and can be found in different regions of South-East Asia including Malaysia. Ethnopharmacologically, various parts of the plant (e.g. leave, fruit and root) are widely used in Asian countries for centuries to treat different types of diseases and ailments such as hypertension, diabetes, joint aches, muscle pain, coughs, influenza, toothaches and rheumatism. Scientific findings also demonstrated different pharmacological actions of various parts of P. sarmentosum such as adulticidal, antitermite, antioxidant, antifungal, antituberclosis, antiplasmoid, antimalarial, hypoglycemia, antiinflammatory, antinoceptive, antipyretic, antibacterial, anticancer, antituberculosis, antiangiogenesis, antimicrobial, antifeedant and cytotoxic activities. Different types of phytochemical constituents have been successfully identified and isolated from various parts of P. sarmentosum. Therefore, the information related to the botany, ethnomedicinal uses, phytochemical constituents and pharmacological activities of P. sarmentosum were reviewed here.