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  • 1
    Online Resource
    Online Resource
    Universiti Putra Malaysia ; 2022
    In:  Pertanika Journal of Science and Technology Vol. 30, No. 2 ( 2022-3-28), p. 1397-1408
    In: Pertanika Journal of Science and Technology, Universiti Putra Malaysia, Vol. 30, No. 2 ( 2022-3-28), p. 1397-1408
    Abstract: One way to minimize emissions of greenhouse gases that contribute to climate change is to reduce the use of wood as the main material for pulp and paper production. Therefore, non-woody plants such as bamboo can be alternatives as raw materials for pulp and paper. This study aims to determine the effect of the different bamboo species and age on the bamboo pulping yield and bamboo mechanical paper properties. Bambusa vulgaris, Gigantochloa levis, and Gigantochloa scortechinii bamboo species or locally known as Aur, Beting, and Semantan bamboo at the age of 1, 3, and 5-year old, were pulped using Soda-Anthraquinone (AQ) pulping. No beating process was conducted to all the papermaking processes to evaluate the basic mechanical properties of the bamboo paper. Pulping yield ranged from 35.7 to 51.7% at different bamboo species and age, with the pulping conditions at 20% of NaOH, 170ºC pulping temperature, 90 min time to reach pulping temperature and 90 min time at pulping temperature, 1:6 of bamboo to liquor ratio and 0.1% of AQ based on bamboo oven-dried weight. The paper was made according to TAPPI Standard T205 sp- 95. The paper mechanical properties for burst index, tear index, tensile index, and folding endurance ranged from 1.32 to 2.36 kPa.m2/g, 7.48 to 14.9 Nm2/g, 16.02 to 29.68 Nm/g, and 2 to 28 double folds, respectively, at different bamboo species and age. It was found that Beting bamboo has the potential to be a viable raw material for pulp and paper products as it shows the highest mechanical properties compared to Aur and Semantan.
    Type of Medium: Online Resource
    ISSN: 2231-8526
    URL: Issue
    URL: Issue
    Language: English
    Publisher: Universiti Putra Malaysia
    Publication Date: 2022
    detail.hit.zdb_id: 2887717-2
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  • 2
    Online Resource
    Online Resource
    Trans Tech Publications, Ltd. ; 2021
    In:  Materials Science Forum Vol. 1025 ( 2021-3), p. 312-318
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 1025 ( 2021-3), p. 312-318
    Abstract: Fiber morphology of 3 species of bamboo namely Bambusa v ulgaris , Gigantochloa levis , and Gigantochloa scortechinii at age of 1, 3, and 5 years, was evaluated. It shows that different species of bamboo have different properties in terms of their fiber morphology that consist of fiber length, fiber diameter, and lumen diameter. Fiber diameter, fiber length, and cell wall thickness increased with the increasing of the bamboo age but the lumen diameter decreased when the bamboo gets older. G. levis at age 1 to 3 and G. scortechinii at age 1 have high potential to be the raw materials for the pulp and paper industry.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2021
    detail.hit.zdb_id: 2047372-2
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  • 3
    In: Membranes, MDPI AG, Vol. 12, No. 10 ( 2022-09-21), p. 913-
    Abstract: To meet the need for food products to be safe and fresh, smart food packaging that can monitor and give information about the quality of packaged food has been developed. In this study, pH-sensitive films with sago starch and various anthocyanin concentrations of Brassica oleracea also known as red cabbage anthocyanin (RCA) at 8, 10, 12, and 14% (w/v) were manufactured using the solvent casting process. Investigation of the physicochemical, mechanical, thermal, and morphological characteristics of the films was performed and analysed. The response of these materials against pH changes was evaluated with buffers of different pH. When the films were exposed to a series of pH buffers (pH 3, 5, 9, 11, and 13), the RCA-associated films displayed a spectacular colour response. In addition, the ability of the starch matrix to overcome the leaching and release of anthocyanins was investigated. Higher concentrations of RCA can maintain the colour difference of films after being immersed in a series of buffer solutions ranging from acidic to basic conditions. Other than that, incorporating RCA extracts into the starch formulation increased the thickness whereas the water content, swelling degree, tensile strength, and elongation at break decreased as compared to films without RCA. The immobilisation of anthocyanin into the film was confirmed by the FTIR measurements. The surface patterns of films were heterogeneous and irregular due to the presence of RCA extract aggregates, which increased as the extract concentration enhanced. However, this would not affect the properties of films. An increase in thermal stability was noted for the anthocyanin-containing films at the final stage of degradation in TGA analysis. It is concluded that RCA and sago starch formulation has great potential to be explored for food packaging purposes.
    Type of Medium: Online Resource
    ISSN: 2077-0375
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2614641-1
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  • 4
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1793, No. 1 ( 2021-02-01), p. 012076-
    Abstract: Thermal have significantly impact the productivity of work as well as the occupants’ satisfaction to their surroundings. The objective of this study is to evaluate the implication of thermal environmental conditions to human/manikin in a ventilated air conditioning space using CFD simulations. The thermal distributions of environmental parameters, which were air velocity, air temperature, radiant temperature, inside an office room with air-conditioning system were simulated. The design of experimental study was utilised through the controlled conditions based on the real laboratory studies and real case studies which were later on utilised as the external validity of the field studies. The model of the office environment has been built in the ANSYS Engineering simulation software. The thermal distributions, spatial profiles of PMV are obtained to illustrate thermal conditions intuitively. The distribution of PMV indicated that operative temperature at the 23 °C shows that the PMV is at the level of comfort. Meanwhile the value of PMV for the operative temperature at 23 °C is at 0.79 near the skin of manikin. The research outputs provide useful information for engineers especially in designing air-conditioning system in order to design and build a comfortable indoor environment climate especially in the office environment.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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  • 5
    In: Processes, MDPI AG, Vol. 8, No. 7 ( 2020-07-06), p. 786-
    Abstract: Fluctuation in fossil fuel prices and the increasing awareness of environmental degradation have prompted the search for alternatives from renewable energy sources. Biodiesel is the most efficient alternative to fossil fuel substitution because it can be properly modified for current diesel engines. It is a vegetable oil-based fuel with similar properties to petroleum diesel. Generally, biodiesel is a non-toxic, biodegradable, and highly efficient alternative for fossil fuel substitution. In Malaysia, oil palm is considered as the most valuable commodity crop and gives a high economic return to the country. However, the ethical challenge of food or fuel makes palm oil not an ideal feedstock for biodiesel production. Therefore, attention is shifted to non-edible feedstock like Jatropha curcas Linnaeus (Jatropha curcas L.). It is an inedible oil-bearing crop that can be processed into biodiesel. It has a high-seed yield that could be continually produced for up to 50 years. Furthermore, its utilization will have zero impact on food sources since the oil is poisonous for human and animal consumption. However, Jatropha biodiesel is still in its preliminary phase compared to palm oil-based biodiesel in Malaysia due to a lack of research and development. Therefore, this paper emphasizes the potential of Jatropha curcas as an eco-friendly biodiesel feedstock to promote socio-economic development and meet significantly growing energy demands even though the challenges for its implementation as a national biodiesel program might be longer.
    Type of Medium: Online Resource
    ISSN: 2227-9717
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2720994-5
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  • 6
    In: Biodiversitas Journal of Biological Diversity, UNS Solo, Vol. 23, No. 6 ( 2022-06-06)
    Abstract: Abstract. Hassan NHM, Abdullah N, Kelana DNA, Perumal M. 2022. Early field growth performance of ten selected bamboo taxa: The case study of Sabal bamboo pilot project in Sarawak, Malaysia. Biodiversitas 23: 2882-2892. Information on early growth performance and survival rate of bamboos are pivotal for the development of the Sarawak bamboo industry. Thus, a study on the early growth performance of ten bamboo taxa was conducted at the Sarawak Bamboo Pilot Project site in Sabal, Simunjan, Sarawak, Malaysia. Six taxa were originated from Yogyakarta, Indonesia, and the other four bamboo taxa were originated locally from Sarawak. Study sites were established at bamboo plantation areas at different age stands. Two replications of data for each taxon involving 50 readings (25 readings for one replication) were measured and quantified for growth parameters of the number of culms per clump, number of new shoots, culm diameter, and culm height. The findings indicated that Gigantochloa hasskarliana (Busi bamboo) had the highest number of culms per clump (43) while Guadua angustifolia (Duri bamboo) had the highest number of new bamboo shoots (2.93). Nonetheless, Dendrocalamus asper (Green) had the highest culm diameter (3.61 cm) while Bambusa balcooa (Bema bamboo) had the highest culm height (8.36 m). The results showed that different bamboo species have different early growth performances, thus further detailed investigation and long-term monitoring period are required to achieve the commercial plantation scale, especially in Sarawak.
    Type of Medium: Online Resource
    ISSN: 2085-4722 , 1412-033X
    Language: Unknown
    Publisher: UNS Solo
    Publication Date: 2022
    detail.hit.zdb_id: 2660049-3
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  • 7
    Online Resource
    Online Resource
    Penerbit UMT, Universiti Malaysia Terengganu ; 2020
    In:  Universiti Malaysia Terengganu Journal of Undergraduate Research Vol. 2, No. 1 ( 2020-01-31), p. 1-8
    In: Universiti Malaysia Terengganu Journal of Undergraduate Research, Penerbit UMT, Universiti Malaysia Terengganu, Vol. 2, No. 1 ( 2020-01-31), p. 1-8
    Abstract: Black snail, Faunus ater is an abundant species in Malaysia yet not many research have focused on its physiological and biological activities. This research aimed to assess the condition index (CI) and reproductive status based on the gonadosomatic index (GSI) for short-term duration. Samples were collected monthly from Merchang Lagoon, from November 2018 to January 2019. Four different types of condition indices equation were applied in this study and the results revealed that there were significant differences between four equations for measuring the CI (P=0.000). However, the result for the GSI shows no significant difference between three month of sampling (P 〉 0.05). CI based on fresh weight measurement (Fww/Tww x 100) and dry weight measurement (Fdw/Fww x 100) reached its peak when GSI decreased. The rest of the trend for CI fluctuated and CI was not affected by GSI. Overall, this study concluded that, there were trends observed in CI and GSI for the black snails. However, it is suggested that longer term observation in future research is needed have a better understanding on the black snails.
    Type of Medium: Online Resource
    ISSN: 2637-1138
    Language: Unknown
    Publisher: Penerbit UMT, Universiti Malaysia Terengganu
    Publication Date: 2020
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  • 8
    In: Water, MDPI AG, Vol. 15, No. 6 ( 2023-03-09), p. 1039-
    Abstract: Dam reliability analysis is performed to determine the structural integrity of dams and, hence, to prevent dam failure. The Chenderoh Dam structure is divided into five parts: the left bank, right bank, spillway, intake section, and bottom outlet, with each element performing standalone functions to maintain the overall Dam’s continuous operation. This study presents a numerical reliability analysis of water dam reservoir banks using fluid–structure interaction (FSI) simulation of the bottom outlet structures operated at different discharge conditions. Three-dimensional computer-aided drawings were used to view the overall Chenderoh Dam. Next, a two-way fluid–structure interaction (FSI) model was developed to explore the influence of fluid flow and structural deformation on dam systems. The FSI modeling consists of Ansys Fluent and Ansys Structural modules to consider the boundary conditions separately. The reliability and performance of the reservoir bottom outlet structure was effectively simulated and recognised using FSI. The maximum stress on the bottom outlet section is 18.4 MPa, which is lower than the yield stress of mild steel of 370 MPa. Therefore, there will be no structural failure being observed on the bottom outlet section when the butterfly valve is fully closed. With a few exceptions, the FSI models projected that bottom outlet structures would be able to run under specified conditions without structural collapse or requiring interventions due to having lower stress than the material’s yield strength.
    Type of Medium: Online Resource
    ISSN: 2073-4441
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2521238-2
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  • 9
    Online Resource
    Online Resource
    Trans Tech Publications, Ltd. ; 2022
    In:  Materials Science Forum Vol. 1056 ( 2022-03-14), p. 69-74
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 1056 ( 2022-03-14), p. 69-74
    Abstract: The physical (density and moisture content) and chemical properties of the oil palm trunk (OPT) were examined. The effect of different densities (500, 600, and 700 kgm -3 ) and different percentages of urea-formaldehyde (UF) resin content (8, 10, and 12%) on the single layer at the different portions of OPT particleboard were evaluated for mechanical and dimensional stability. The results showed that the bottom portion and near bark had a positive result on density and moisture content. Lignin, holocellulose, and alpha-cellulose of the OPT showed the highest content at the bottom portion. The density was found to effect all the board properties significantly at p 〈 0.05 on the modulus of elasticity (MOE), modulus of rupture (MOR), internal bond (IB), thickness swelling (TS), and water absorption (WA) of the particleboards. For the resin content, all the board properties were effected except for the water absorption. The particleboards produced, from 700 kgm -3 densities and 10% resin content, met the minimum requirement for the particleboard (Type 18) stipulated in the Japanese Industrial Standard (JIS A 5908). The particleboard manufacturing from OPT particles as the replacement for wood is very promising.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2022
    detail.hit.zdb_id: 2047372-2
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  • 10
    Online Resource
    Online Resource
    Akademia Baru Publishing ; 2021
    In:  Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Vol. 85, No. 1 ( 2021-08-01), p. 125-134
    In: Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Akademia Baru Publishing, Vol. 85, No. 1 ( 2021-08-01), p. 125-134
    Abstract: Temperatures are rising gradually around the world due to the issue of global warming. This condition also affects those who have to work for long hours. A comfortable work environment helps employees to increase work productivity. Thermal comfort is the occupant’s satisfaction with the surrounding thermal conditions. Therefore, the objective of this study is to evaluate the thermal environmental conditions of air conditioning through Computational Fluid Dynamics simulations. The distributions of environmental parameters such as air velocity, air temperature, radiant temperature, inside an o?ce room with air-conditioning are presented. Based on these distributions, spatial pro?les of Predicted Mean Vote Index (PMV) are obtained to illustrate thermal conditions intuitively. This study was conducted under controlled environment inside special laboratory. To achieve this model office environment has been built in an environmental chamber. The distribution of PMV indicates that operative temperature at the 23 oC shows that the PMV is comfortable. The value of PMV in operative temperature at 23 oC is 0.79 near the skin of an occupant. The research outputs provide useful information for designers of the air-conditioning system to build a comfortable indoor environment in the office environment.
    Type of Medium: Online Resource
    ISSN: 2289-7879
    URL: Issue
    Language: Unknown
    Publisher: Akademia Baru Publishing
    Publication Date: 2021
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