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Johor Bahru, Malaysia

Universiti Teknologi Malaysia is the oldest public engineering and technological university in Malaysia. The university specializes in technical studies, with separate faculties for the engineering divisions such as Civil, Mechanical, Electrical, Chemical and Biomedical engineering. It also has faculties for Education, Pure science, Management, and Human Resources Development. It is the country's major source of graduate engineers and similar professionals.With over 20,000 students on campus, more than 25% of them are postgraduates. Since the 1990s, the number of foreign students, particularly from neighbouring Asian countries, the Middle East, and Africa, has been increasing, especially in postgraduate programs. UTM graduates have gone on to many academic and professional institutions across the world.Universiti Teknologi Malaysia is located in Kuala Lumpur, the capital city of Malaysia, and Johor Bahru, the southern city in Iskandar Malaysia, in the south of Peninsular Malaysia. Wikipedia.

Chua L.S.,University of Technology Malaysia
Journal of Ethnopharmacology | Year: 2013

Ethnopharmacological relevance Rutin is a common dietary flavonoid that is widely consumed from plant-derived beverages and foods as traditional and folkloric medicine worldwide. Rutin is believed to exhibit significant pharmacological activities, including anti-oxidation, anti-inflammation, anti-diabetic, anti-adipogenic, neuroprotective and hormone therapy. Till date, over 130 registered therapeutic medicinal preparations are containing rutin in their formulations. This article aims to critically review the extraction methods for plant-based rutin and its pharmacological activities. This review provides comprehensive data on the performance of rutin extraction methods and the extent of its pharmacological activities using various in vitro and in vivo experimental models. Materials and methods Literatures including journals, patents, books and leaflets reporting on rutin from natural resources are systematically reviewed, particularly in the aspect of its extraction methods and biological activities. Factors affecting the efficiency of rutin extraction such as extraction temperature, duration and solvent to sample ratio are presented based on the findings of previous studies. The observed biological activities followed by clear explanation are also provided accordingly. Results The biological activities of rutin varied largely dependent on the geographical and plant origins. The complexity of natural rutin has impeded the development of rutin derived drugs. The detail mechanism of rutin in human body after consumption is still unclear. Therefore, studies are intensively carried out both in vitro and in vivo for the better understanding of the underlying mechanism. The studies are not limited to the pharmacological properties, but also on the extraction methods of rutin. Many studies have focused on the optimization of extraction method to increase the extraction yield of rutin. Currently, the performances of modern extraction approaches have also been compared to the conventional heat reflux method as a benchmark. Conclusion There are various extraction methods for plant-based rutin ranging from conventional method up to the use of modern techniques such as ultrasound, mechanochemical, microwave, infrared and pressurized assisted methods. However, proper comparison between the methods is very difficult because of the variance in plant origin and extraction conditions. It is important to optimize the extraction method in order to produce high yield and acceptable purity of rutin with a reasonable cost. Even though rutin has been proven to be effective in numerous pharmacological activities, the dosage and toxicity of rutin for such activities are still unknown. Future research should relate the dosage and toxicity of rutin for the ethnobotanical claims based on the underlying mechanisms. © 2013 Elsevier Ireland Ltd.

Mahdi Ziaei S.,University of Technology Malaysia
Renewable and Sustainable Energy Reviews | Year: 2015

The financial crisis is considered a major economic issue and energy consumption and pollution are believed to be one of the most important environmental concerns in the new millennium. The review on investigation of the nexus among energy consumption, GDP growth, financial development and CO2 emission has shown no definitive conclusion. Apart from that, the effects of financial development on energy consumption are not yet understood properly. Thus, this article investigates the effects of financial indicator shocks i.e. credit market and stock market shocks on energy consumption and carbon dioxide (CO2 emissions) and vice versa. Panel Vector Auto Regression (PVAR) models were employed to investigate the relationships in 13 European and 12 East Asia and Oceania countries from 1989 to 2011. Findings emphasize the important role of CO2 emission and energy consumption on explaining each other's deviation, with only the degree of effect differing. Although energy consumption and CO2 emission shocks on financial indicators such as private sector credit is not very pronounced in both groups of countries, but the strength of energy consumption shock on stock return rate in European countries is greater than East Asian and Oceania countries. Conversely shocks to stock return rate influence energy consumption especially in long horizon in case of East Asia and Oceania countries. © 2014 Elsevier Ltd.

Prawoto Y.,University of Technology Malaysia
Computational Materials Science | Year: 2012

This paper summarizes research work related to materials with zero, or negative Poisson's ratio, materials which are also referred to as auxetic materials. This review puts an emphasis on computations and aspects of their mechanics. It also considers diverse examples: from large structural, to biomedical applications. It is concluded that auxetic materials are technologically and theoretically important. While the development of the research has been dominated by periodic/ordered microstructures, the author predicts that future research will be in the direction of disordered microstructures utilizing the homogenization method. © 2012 Elsevier B.V. All rights reserved.

Nasef M.M.,University of Technology Malaysia | Nasef M.M.,Malaysia Japan International Institute of Technology
Chemical Reviews | Year: 2014

Fuel cell technology is one of the key emerging technologies that is currently attracting tremendous effort with the aim to provide alternative environmentally friendly and efficient power sources. The worldwide move away from conventional fossil fuel combustion power generation technologies is driving much of this important research. The replacement of a liquid electrolyte by PEM in such systems has eliminated the corrosion problems and conferred on the system additional advantages such as simplicity of construction, compactness, and quick self-starting at ambient temperatures. The successful performance of these kinds of fuel cell systems depends critically on the role played by the PEM. The second category involves the formation of acid-base complexes that provide a viable alternative for membranes that can maintain high conductivity at elevated temperatures without suffering from dehydration effects.

Faraji S.,University of Technology Malaysia | Ani F.N.,University of Technology Malaysia
Journal of Power Sources | Year: 2014

Electrochemical capacitors (ECs), also known as pseudocapacitors or supercapacitors (SCs), is receiving great attention for its potential applications in electric and hybrid electric vehicles because of their ability to store energy, alongside with the advantage of delivering the stored energy much more rapidly than batteries, namely power density. To become primary devices for power supply, supercapacitors must be developed further to improve their ability to deliver high energy and power simultaneously. In this concern, a lot of effort is devoted to the investigation of pseudocapacitive transition-metal-based oxides/hydroxides such as ruthenium oxide, manganese oxide, cobalt oxide, nickel oxide, cobalt hydroxide, nickel hydroxide, and mixed metal oxides/hydroxides such as nickel cobaltite and nickel-cobalt oxy-hydroxides. This is mainly due to the fact that they can produce much higher specific capacitances than typical carbon-based electric double-layer capacitors and electronically conducting polymers. This review presents supercapacitor performance data of metal oxide thin film electrodes by microwave-assisted as an inexpensive, quick and versatile technique. Supercapacitors have established the specific capacitance (Cs) principles, therefore, it is likely that metal oxide films will continue to play a major role in supercapacitor technology and are expected to considerably increase the capabilities of these devices in near future. © 2014 Elsevier B.V. All rights reserved.

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