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Search Results: 1 - 10 of 4539 matches for " Mohd Rashid "
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Towards Biorefinery Production of Microalgal Biofuels and Bioproducts: Production of Acetic Acid from the Fermentation of Chlorella sp. and Tetraselmis suecica Hydrolysates  [PDF]
Mohd Asyraf Kassim, Mohd Aziz Rashid, Ronald Halim
Green and Sustainable Chemistry (GSC) , 2017, DOI: 10.4236/gsc.2017.72012
Abstract: Successful commercialization of microalgal bio-industry requires the design of an integrated microalgal biorefinery system that facilitates the co-production of biofuels, high-value products and industrial chemicals from the biomass. In this study, we investigated the use of sugar hydrolysate obtained from enzymatic saccharification of microalgal biomass (Chlorella sp. and T. suecica) as fermentation feedstock to produce industrially important chemicals, in particular acetic acid and butyric acid. By using hydrolysate with low sugar content as substrate for the anaerobic fermentation (1.5 - 2.4 g/L), we were able to prevent the bacterium C. saccharoperbutylacetonicum from activating its solventogenesis pathway. As a result, the fermentation process generated a product stream that was dominated by organic acids (acetic acid and butyric acid) rather than solvents (butanol, ethanol and acetone). Acetic acid constituted up to 92 wt% of Chlorella’s fermentation products and 80 wt% of T. suecica’s fermentation products. For T. suecica, the fermentation consumed almost all of the sugar available in the hydrolysate (up to 92% of initial sugar) and produced a reasonable yield of fermentation products (0.08 g fermentation products/g sugar). The Gompertz equation was successfully used to predict the formation kinetics of acetic acid and other fermentation products across both species. The results in the study demonstrate the production of industrially important chemicals, such as acetic acid and butyric acid, from the fermentation of microalgal sugar. The process described in the study can potentially be used as a value-adding step to generate biochemicals from cell debris in an integrated microalgal biorefinery system.
Biosynthesis of Self-Dispersed Silver Colloidal Particles Using the Aqueous Extract of P. peruviana for Sensing dl-Alanine
Mohd Rashid,Suhail Sabir
ISRN Nanotechnology , 2014, DOI: 10.1155/2014/670780
Abstract: We report the biosynthesis of silver nanoparticles (AgNPs) in a single step using edible fruit aqueous extract of P. peruviana that essentially involved the concept of green chemistry. Yellowish-brown color appeared upon adding the broth of P. peruviana to aqueous solution of 1?mM AgNO3 which indicates the formation of AgNPs. The maximum synthesis of these nanoparticles was being achieved in nearly 2?hrs at 28°C. The synthesis of AgNPs was followed by AgNPs UV-visible spectroscopy. Particle size and morphology of AgNPs were studied by transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. These studies revealed that the AgNPs characterized were spherical in shape with diameter ranging from 31 to 52?nm. The energy dispersive X-ray spectroscopy showed that the AgNPs present are approximately 63.42 percent by weight in the colloidal dispersion. The absorption spectra of the AgNPs in absence and presence of dl-alanine show a distinguish shift in surface plasmon resonance (SPR) bands. Thus, these nanoparticles may be used as a chemical sensor for dl-alanine present in the human blood. 1. Introduction Nanobiotechnology is the most emerging field in the recent time owing to many applications over other conventional techniques due to the diversity in nature and availability of more biologically processed components from plants for the formation of nanostructures. In the recent past, nanobiotechnology has acquired more recognition due to multidisciplinary approch and emerged as a novel technique used for various applications in different fields. The Self-dispersed, controlled shape and size of nanoparticles play a pivotal contribution in the field of environment, biotechnology, and biomedical applications. To synthesize metal nanoparticles, different approaches and methods have been exploited, namely, ultraviolet irradiation, aerosol technologies, lithography, laser ablation, ultrasonic fields, and photochemical reduction techniques reported in the literature. Since most of these procedures involve toxic and hazardous chemicals which render them expensive and environmentally unfriendly, therefore, an environment friendly and sustainable green chemistry approach will be highly appreciated to avoid the use of hazardous chemicals. The two approaches used to synthesize nanosized particles are top-down and bottom-up strategies. Nanoparticles as-synthesized are generally ≤100?nm in the dimension [1]. Along with many benefits, there are some drawbacks of chemically based synthesized nanosize particles. It involves the bulk use of
WiFi/WiMAX Seamless Convergence with Adaptive Vertical Handover for Continuity of Internet Access  [PDF]
Rashid Abdelhaleem Saeed, Hafizal Mohamad, Mazlan Abbas, Borhanuddin Mohd Ali
Advances in Internet of Things (AIT) , 2011, DOI: 10.4236/ait.2011.12005
Abstract: The next generation of the wireless networks will consist of several overlapping tiers. Provision of undisrupted communication to mobile users is a challenging task. Handover delay is one of the problematic issues that users are faced in the heterogeneous networks. However, in the case of both the WiMAX and the WiFi technologies which are located at the same base station (BS), the vertical handover (VHO) delay will be less as compared with the two conventional WiMAX/WiFi heterogeneous networks with two different wireless Internet service providers (WISP). Nevertheless, protocol conversion is still adding delay and jitter for data exchange between the needed two technologies. In this paper, in order to reduce the delay in the protocol conversion, a new industrial design for WiWi (WiMAX and WiFi) adaptation layer is proposed. The realization of the interworking between these two standards is discussed and evaluated. The results show that the proposed scheme-with the scenario under study- has better performance than other related works.
Preliminary Results of Solar Flare Induced D-Region Perturbations over UKM Using Stanford AWESOME Receiver  [PDF]
Mohd Masri Abd Rashid, Mahamod Ismail, Zamri Zainal Abidin
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.35058
Abstract: We present the preliminary results of VLF signal perturbations produced due to solar flare. The data were recorded by the Stanford VLF AWESOME receiver located at National University of Ma-laysia, Selangor. Two new long distance (>1000 km) VLF paths, JJI-UKM (2700 km) and NWC-UKM (3300 km) were analyzed simultaneously. Data from the GOES satellite were used to determine the onset time and type of each of these flares. Results indicated that all five solar flare events with an X-ray peak flux above 10-5 W/m2 (M-class) were recorded, 37.5% for X-ray flux greater than 10-6 W/m2 (C-class), while the weakest X-ray flux recorded was 2.6 × 10-7 W/m2 (B-class) with 0.24% probing potentiality. We found a strong positive correlation (0.84) between solar flare radiation intensity and the values of amplitude and phase perturbations for both paths. The values of amplitude and phase perturbations time-correlated with solar flare, varied from 0.2 to 5 dB and 0.15 to 20 degree respectively. These findings are in complete agreement with previous works and demonstrate that the data obtained by the UKM AWESOME observation station will provide addi-tional contribution to the study of ELF/VLF waves phenomena in the ionosphere/magnetosphere, especially at low latitudes region.
THERMAL PERFORMANCE OF CONTEMPORARY HOUSE IN THE CITY OF DHAKA
Rumana Rashid,Mohd. Hamdan Bin Ahmad
Dimensi : Journal of Architecture and Built Environment , 2008,
Abstract: A contemporary house located within a dense area of Dhaka, the capital city of Bangladesh was selected to evaluate its thermal performance. The study was based on the field measurements conducted during selected days in the summer period. The field survey was conducted using one set of thermal data logger installed in the selected house to record the air temperature and relative humidity of both indoor and outdoor spaces. The research result concluded that the contemporary house experienced much higher temperature during night and early morning. The indoor air temperature during the daytime was equal to the outdoor or sometime higher illustrating that it was overheating. On the other hand, previous study on traditional house within the same area showed that indoor air temperature was lower than outdoor air temperature, something that the contemporary house failed to achieve.
THERMAL PERFORMANCE OF ROOFTOP GREENERY SYSTEM AT THE TROPICAL CLIMATE OF MALAYSIA A case study of a 10 storied building R.C.C flat rooftop at UTM, Johor Bahru, Malaysia
Rumana Rashid,Mohd. Hamdan Bin Ahmed
Dimensi : Journal of Architecture and Built Environment , 2009,
Abstract: In tropical countries rooftop greenery is more sympathetic to the prevailing climate and provides comfortable indoor environment. This paper analyses the above hypothesis on a 10 storied residential apartments in Universiti Teknologi Malaysia (UTM). The analysis of actual performance of the rooftop greenery can provide the information on effectiveness of its application on contemporary houses for tropical climate in Malaysia. Empirical studies have been performed an internal and external roof surface, where temperature and air temperature were measured for a period of three days in two phases. The first phase of measurement was carried out when the rooftop was empty. After the rooftop greenery was built then the second phase of measurement was conducted. Expected findings of the research are that the green rooftop will tend to experience lower surface temperature than the original exposed roof surface. So this research work will provide an introduction or preliminary guide line for thermally responsive architecture on the basis of thermal performance of the rooftop greenery system. Temperature is the main criteria of human comfort. To provide an indoor comfortable environment through the greening of the rooftop of the building is more appropriate in the tropical climate of Malaysia.
Pathogenicity Assay and Molecular Identification of Fungi and Bacteria Associated with Diseases of Tomato in Malaysia  [PDF]
Tavga Sulaiman Rashid, Kamaruzaman Sijam, Hayman Kakakhan Awla, Halimi Mohd Saud, Jugah Kadir
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.76090
Abstract: This study was conducted in order to determine the fungi and bacteria associated with tomato plants at Cameron Highlands Malaysia. The fungi which have been isolated and detected from tomato plants were: Fusarium oxysporum, F. solani, F. acuminatum, Rhizoctonia solani, Colletotrichum boninense, C. acutatum and Phoma destructiva. The bacteria which have been isolated and detected from tomato plants were: Ralstonia solanacearum,Xanthomonas vesicatoria, X. gardneri and Pseudomonas syringae. While the most pathogenic fungi were C. boninense, P. destructive and F. oxysporum with the disease incidence (89.6%, 86.6%, 85.6%) respectively, the most pathogenic bacteria were X. vesicatoria
A Study of Vertical Wind Turbine for Application in Low Wind Speed Condition in UiTM Terengganu, Malaysia  [PDF]
Ermeey Abd Kadir, Mohd Taib Miskon, Nasran Abd Rashid, Mat Yushafizee Yunus
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.68002
Abstract: This paper presented an investigation of an energy generation project by using a wind turbine in UiTM Terengganu, Malaysia. The significance of the project is to evaluate the proposed wind energy setup with the tropical environmental condition, especially in Malaysia. The wind turbine is built close to the seashore and facing the South China Sea. A relationship between wind speed with and the voltage level at the energy generator output terminal is analysed theoretically. Published wind speed data has been used in determining a suitable wind turbine system. Actual wind speed data is recorded starting from June 2017 until December 2017, and the data is compared with the published results. It has been found that the recorded data is in line with the published results. Moreover, it has been found that the mean wind speed collected at the proposed site is low, which is 2 m/s to 3.7 m/s. Furthermore, the wind turbine is actively producing energy for approximately 4 hours per day. A 300 W vertical axis wind turbine has been developed and tested, and it has been found that the efficiency of the energy generating system is less than 10%, which contributes for a significant amount per month.
Nutritional Status and Physical Activities among Army Trainees in Public Institutions of Higher Education in Malaysia  [PDF]
Zulaikha Mohd Rashid, Suriah Abd Rahman, Zalifah Mohd Kasim, Wan Aida Wan Mustapha, Mohd Hazali Mohamed Halip, Zulmadi Arifin, Ummul Fahri Abdul Rauf
Food and Nutrition Sciences (FNS) , 2011, DOI: 10.4236/fns.2011.26074
Abstract: This study was conducted to evaluate the nutritional status and physical activities of university students that enrolled in military training with the age range of 20 - 34 years. Nutritional status assessment was based on eating habit questionnaires, anthropometric measurements with body mass index (BMI) and waist-to-hip ratio (WHR), food intake records for three days and also food frequency questionnaire (FFQ). Assessment of physical activities was carried out using physical activities records. Food intake and physical activities data were analyzed using the Nutri-Antro Web (NAW) software. Generally, the subjects were found to have good nutrition knowledge and food intake habits, except for having an irregular meal time (85.0%). Based on BMI studies, 80.0% of male subjects and 78.6% of female subjects were within normal range with the average of 22.94 ± 2.97 kg/m2 and 21.40 ± 3.06 kg/m2 respectively. None of the subjects had WHR above the cut-off point of 1.0 for men and 0.85 for women. The average energy intake for male and female was 2589 ± 687 kcal and 1959 ± 460 kcal respectively. Overall, nutrient intake of both genders fulfilled Malaysia Recommended Nutrient Intake 2005 (RNI) except for the average energy intake of the female subjects. The daily physiccal activities patterns revealed that 73.6% was used for light activities, 19.7% for moderate while 7.4% for heavy activities. The average daily energy expenditure for male subjects (3161 ± 444 kcal) was higher than the female subjects (2492 ± 388 kcal). Both male and female subjects have negative energy balance of -572 kcal and -533 kcal respecttively. Majority of the subjects were categorized as physically active (77.9%). Pearson correlation test showed that physical activities were positively correlated (p < 0.05) with BMI, WHR and nutrient intakes except for the intake of vitamin C. In conclusion, nutritional status and physical activity level of subjects were satisfactory.
Oil Palm Physical and Optical Characteristics from Two Different Planting Materials
Mohd Hafiz Mohd Hazir,Abdul Rashid Mohamed Shariff
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: This study discovers the uniqueness of physical and optical characteristics of the oil palm Fresh Fruit Bunches (FFB) and is based on two different tenera planting materials namely PORIM SERIES 1 (PS 1) and PORIM SERIES 2 (PS 2). Three methods have been done to determine the characteristics which are as follows; 1) manual approach by measuring the weight, length, width and circumference of oil palm FFB, 2) machine vision technique for color information extraction and 3) multi-band portable, active optical sensor system to determine the chlorophyll and anthocyanin content. A total of thirty bunches were standardized into a ripe grade and have been used as samples in this study. The results showed that each planting material produces different physical and optical characteristics. The correlation between the weight and linear dimensions of oil palm FFB was found to be 80%. This study gives very important information in helping researchers on the development of future non-contact and non-destruction oil palm FFB grading equipment and system.
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