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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.
Environmentally sustainable applications of agro-based spent mushroom substrate (SMS): an overview
Mohd Hanafi, Fatimah Hafifah,Rezania, Shahabaldin,Mat Taib, Shazwin,Md Din, Mohd Fadhil,Yamauchi, Masahito,Sakamoto, Mariko,Hara, Hirofumi,Park, Junboum,Ebrahimi, Shirin Shafiei Springer-Verlag 2018 Journal of material cycles and waste management Vol.20 No.3
Yasin, Siti Munira,Ismail, Nurhuda,Noor, Norizal Mohd,Azman, Mohd Shafiq Mohd,Taib, Hanisah,Jusop, Junainah Mat,Salaudin, Nur Atirah Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1
Background: Medical students' views may provide some direction for future policy considerations. Aim: The aim of this study was to assess gender differences in future doctors' receptiveness to currently implemented anti-smoking messages and the effectiveness of those messages. Materials and Methods: We administered a questionnaire to all students at a medical university in Malaysia, asking how frequently they noted anti-smoking policies, anti-smoking campaigns, and anti-smoking messages in schools. In addition, the questionnaire investigated most effective methods to convey these messages. Results: A total of 522 (59.7%) students responded. Students were least likely to approve of total bans on cigarettes and increasing the price of cigarettes, and most likely to approve of bans on use of cigarettes in public places and sales to individuals less than 16 years old. Approval of total bans on cigarettes was more common in female students than in males OR=0.39 (95%CI: 0.18-0.86). Furthermore, compared to the female students, the male students thought that printed media; OR=2.32 (95%CI: 1.31-4.10), radio; OR=1.93 (95%CI: 1.15-3.22) and the internet; OR=1.96 (95%CI: 1.15-3.33) were very effective at delivering anti-smoking messages. Conclusions: Gender differences existed in the future doctors' perception of the effectiveness of anti-smoking initiatives. Taking this gender difference into account may increase the receipt of anti-smoking messages in adolescents.
Microplastics pollution in different aquatic environments and biota: A review of recent studies
Rezania, Shahabaldin,Park, Junboum,Md Din, Mohd Fadhil,Mat Taib, Shazwin,Talaiekhozani, Amirreza,Kumar Yadav, Krishna,Kamyab, Hesam Elsevier 2018 MARINE POLLUTION BULLETIN Vol.133 No.-
<P><B>Abstract</B></P> <P>Microplastics (MPs) are generated from plastic and have negative impact to our environment due to high level of fragmentation. They can be originated from various sources in different forms such as fragment, fiber, foam and so on. For detection of MPs, many techniques have been developed with different functions such as microscopic observation, density separation, Raman and FTIR analysis. Besides, due to ingestion of MPs by wide range of marine species, research on the effect of this pollution on biota as well as human is vital. Therefore, we comprehensively reviewed the occurrence and distribution of MPs pollution in both marine and freshwater environments, including rivers, lakes and wastewater treatment plants (WWTPs). For future studies, we propose the development of new techniques for sampling MPs in aquatic environments and biota and recommend more research regarding MPs release by WWTPs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MPs pollution in different aqueous environments and biota is reviewed. </LI> <LI> MPs pollution in marine and fresh waters were studied more than WWTPs. </LI> <LI> Wide range of marine biota ingested different types of MPs. </LI> <LI> Future studies should focused on treatment as detection is well developed. </LI> </UL> </P>
Catalytic pyrolysis of waste oil into hydrocarbon fuel utilizing cerium oxide catalyst
Mohamad Arsyad Abdul Khalid,Nurhayati Abdullah,Mohamad Nasir Mohamad Ibrahim,Rahmad Mohd Taib,Salmiah Jamal Mat Rosid,Nurasmat Mohd Shukri,NoorFatimah Yahaya,Wan Nazwanie Binti Wan Abdullah 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.6
The depletion of fossil fuels has prompted research into alternative fuels made from regeneration of wastematerials. Pyrolysis is a method of converting waste oil into valuable products, such as char, gas, and fuel. This studypresents the catalytic pyrolysis of waste oil for producing fuel utilizing cerium oxide, CeO2/Al2O3 and zinc oxide, ZnO/Al2O3 catalyst. The catalyst and oil were characterized using several characterization techniques to find the physicochemicalproperties of the catalyst and oil. The optimum condition for catalytic pyrolysis was a reaction temperature at500 oC, with the heating rate at 10 oC/min, utilizing CeO2/Al2O3 catalyst calcined at 700 oC. The catalytic pyrolysis successfullyconverted the waste oil into fuel and the oil product obtained was 93.01 wt% with a high calorific value(54.2MJ/kg). The pyrolysis oil is comprised of aliphatic hydrocarbon (C5-C15 hydrocarbon) that is within the hydrocarbonrange for gasoline and diesel. The oil product was also detected to have a low content of oxygen (3.07 wt%) andsulfur (0.60wt%), indicating its potential to serve as a cleaner, fuel reducing the sulfur dioxide, SOX formation. Theresults reveal that pyrolysis reactors have the ability to convert waste oil into hydrocarbon fuel.