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  • 1
    Online Resource
    Online Resource
    Review of creep modelling for predicting of long-term behavior of glued-laminated bamboo structures
    EDP Sciences ; 2019
    In:  MATEC Web of Conferences Vol. 258 ( 2019), p. 01023-
    Details
    In: MATEC Web of Conferences, EDP Sciences, Vol. 258 ( 2019), p. 01023-
    Abstract: Glued-laminated bamboo has been widely used to substitute timber as a building material. This material classified as a viscoelastic material because it exhibiting properties that are common to both solid and liquid. Under long-term constant loading, the glued-laminated bamboo structures will experience creep deformation. The mechanical, power law and finite element models are common methods that used to predict the creep for viscoelastic material, some of them have advantages and disadvantages. In this manuscript, modelling of long-term creep is reviewed. The fundamental concepts of creep modelling, the influence of variable load level, and humidity were discussed to develop for computational applications. By using FEA program, a subroutine has been developed by previous researchers to accommodate the effect of orthotropic properties. In the future, the subroutine will be used and developed for numerical creep analysis of glued-laminated bamboo.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    URL: Article
    DOI: 10.1051/matecconf/201925801023
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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  • 2
    Online Resource
    Online Resource
    Rain Scanner Radar and Optical Flow Combination For Early Identification of The Incoming Bow Echo Heavy Precipitation
    IOP Publishing ; 2023
    In:  IOP Conference Series: Earth and Environmental Science Vol. 1245, No. 1 ( 2023-09-01), p. 012031-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 1245, No. 1 ( 2023-09-01), p. 012031-
    Abstract: In this study, heavy precipitation in the form of bow echo is observed, identified, and tracked using a rain scanner and optical flow method. Two case studies of bow echoes with a range of properties from 15 to 33 km were observed in the afternoon on 1st February and 4th February 2021. The rain scanner developed based on X-band radar could obtain the first detection of the bow echo shape. The difference between these two bow echoes events is from their initiation. The first bow echo cases are initiated from weakly organized cells. Meanwhile, the second case of bow echo is initiated from a squall line event. Bow echo is initially observed in the western part of Bandung city. Approximately twenty minutes after the first detection, the bow echo passed the center of Bandung city. Image processing using edge detection could track the bow echo from the radar data. Applied Lucas-Kanade optical flow was then used to retrieve the bow echo movement. Vector flow from optical flow showed the dominant movement toward the east direction in both case studies. A simple method to predict the incoming time of the bow echo using the estimated speed from vector flow and the image translation is also presented.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/1245/1/012031
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2434538-6
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  • 3
    Online Resource
    Online Resource
    A mockup unit of the an-eco budget bamboo chalet: design and cost estimation analysis
    EDP Sciences ; 2019
    In:  MATEC Web of Conferences Vol. 258 ( 2019), p. 01010-
    Details
    In: MATEC Web of Conferences, EDP Sciences, Vol. 258 ( 2019), p. 01010-
    Abstract: To succeed by 2050, Malaysia visions would need to be ecologically sustainable. To align with this strategy, a mock-up unit of an-eco budget bamboo chalet is proposed and designed with the aim to provide an affordable and sustainable chalet using local sustainability features and expand the use of natural resources. A sustainable bamboo chalet requires proper initial treatments and preservation in maintaining its esthetic appearance and strength. Otherwise, it can be less durable and under certain circumstances would incur high maintenance cost to the owner. In this study, the proposed unit of an eco-budget bamboo chalet is designed and analyzed using the Staad Pro V8i software. The projection cost of the bamboo chalet in the next 25 years is studied comparatively in which involves a comparison of using a different material, i.e. concrete with the same built-up area. The bamboo chalet had a built-up land area of approximately 7.5 m x 7 m (53 m 2 ) and is made of 95% bamboo which comprises of two different species, i.e. Bambusa Vulgaris and Dendrocalamus Asper Bamboo. The results showed that construction material of the chalet saves up to 18% more when using bamboo compared to concrete. However, the total projected cost of the chalet for the next 25 years by using bamboo was 14% higher compared to concrete. Therefore, emphasis on the usage of bamboo for long-term strategy is required to maintain and control the gradual trend cost incurred if green building is to be built in Malaysia.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    URL: Article
    DOI: 10.1051/matecconf/201925801010
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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  • 4
    Online Resource
    Online Resource
    Displacement-based design of Reinforced Concrete Special Moment Frame (RC-SMF) with Vertical Irregularity
    EDP Sciences ; 2019
    In:  MATEC Web of Conferences Vol. 258 ( 2019), p. 05014-
    Details
    In: MATEC Web of Conferences, EDP Sciences, Vol. 258 ( 2019), p. 05014-
    Abstract: Reinforced concrete Special Moment Frame (RC-SMF) with irregularity in dimension experiences large inelastic deformation under ground motion. The building code for designing structural elements generally is focused on satisfying the strength and serviceability. On the other hand, the displacement-based design (DBD) procedure is based on building performance level. This paper presents a devoted study of designing structural elements of 8 story RC-SMF with vertical irregularity using the DBD method. This method is mainly using energy-work balance concept with pre-selected yield mechanism and target drift. Moreover, a new lateral force distribution method is used in this study which accounts for inelastic dynamic response and higher mode effects. Strong column-weak beam mechanism is used to design beam and column, and beam moment capacity of each floor is calculated by equating external work to internal work approach. Furthermore, column design strength is taken as the combination of factored gravity loads and maximum expected strength of the beam. The time history analysis results show that story drift is below than the target drift and achieve the desired performance level. Moreover, the results also show lateral force distribution is very close to the lateral shear distribution which obtained from time history analysis.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    URL: Article
    DOI: 10.1051/matecconf/201925805014
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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  • 5
    Online Resource
    Online Resource
    Social support among older adults in Malaysia
    Wiley ; 2020
    In:  Geriatrics & Gerontology International Vol. 20, No. S2 ( 2020-12), p. 63-67
    Details
    In: Geriatrics & Gerontology International, Wiley, Vol. 20, No. S2 ( 2020-12), p. 63-67
    Abstract: This study aimed to determine the factors that influence perceived social support among older adults in Malaysia. Methods We used the 11‐item Duke Social Support Index to assess perceived social support through a face‐to‐face interview. Higher scores indicate better social support. Linear regression analysis was carried out to determine the factors that influence perceived social support by adapting the conceptual model of social support determinants and its impact on health. Results A total of 3959 respondents aged ≥60 years completed the Duke Social Support Index. The estimated mean Duke Social Support Index score was 27.65 (95% CI 27.36–27.95). Adjusted for confounders, the factors found to be significantly associated with social support among older adults were monthly income below RM1000 (−0.8502, 95% CI −1.3523, −0.3481), being single (−0.5360, 95% CI −0.8430, −0.2290), no depression/normal (2.2801, 95% CI 1.6666–2.8937), absence of activities of daily living (0.9854, 95% CI 0.5599–1.4109) and dependency in instrumental activities of daily living (−0.3655, 95% CI −0.9811, −0.3259). Conclusion This study found that low income, being single, no depression, absence of activities of daily living and dependency in instrumental activities of daily living were important factors related to perceived social support among Malaysian older adults. Geriatr Gerontol Int 2020; 20: 63–67 .
    Type of Medium: Online Resource
    ISSN: 1444-1586 , 1447-0594
    URL: Issue
    URL: Article
    DOI: 10.1111/ggi.v20.S2
    DOI: 10.1111/ggi.14033
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2078308-5
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  • 6
    Online Resource
    Online Resource
    A Development of Assessment Instruments Analysis Learning Style and Creativity of Elementary School Based on Forward Chaining Method
    IOP Publishing ; 2019
    In:  Journal of Physics: Conference Series Vol. 1338, No. 1 ( 2019-10-01), p. 012046-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1338, No. 1 ( 2019-10-01), p. 012046-
    Abstract: The aim of this research is knowing whether instrument is feasible or no to get data of research. The instrument of this study is a questionnaire learning style with 66 items consisting of 22 points of statement for each questionnaire of visual, auditorial, and kinesthetic learning styles and learning creativity consists of 48 items. The feasibility test instrument learning style and learning creativity consists of validation, consistency internal, and reliability. Meanwhile, to test the feasibility a used the validity of the contents of the questionnaire. Validator for both questionnaires is expert judgment. There were 60 students as respondents who tested the learning style questionnaire instrument and 64 students as respondents who tested the questionnaire instrument of learning creativity. After undergone a try an instrument learning style there are 45 items that qualified, with 15 items of statement for each of the study visual, auditorial, and a kinesthetic while chief creativity study in get 35 items that qualified based on testing and some revisions of expert judgment.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1338/1/012046
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2166409-2
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  • 7
    Online Resource
    Online Resource
    Surface modification of acid-functionalized mesoporous gamma-alumina for non-fission 99Mo/99mTc generator
    Elsevier BV ; 2022
    In:  Applied Radiation and Isotopes Vol. 187 ( 2022-09), p. 110342-
    Details
    In: Applied Radiation and Isotopes, Elsevier BV, Vol. 187 ( 2022-09), p. 110342-
    Type of Medium: Online Resource
    ISSN: 0969-8043
    URL: Article
    DOI: 10.1016/j.apradiso.2022.110342
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 1499873-7
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  • 8
    Online Resource
    Online Resource
    Pushover analysis in slab-on-piles bridge using reinforced concrete-filled spun piles
    IOP Publishing ; 2023
    In:  IOP Conference Series: Earth and Environmental Science Vol. 1244, No. 1 ( 2023-09-01), p. 012013-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 1244, No. 1 ( 2023-09-01), p. 012013-
    Abstract: Slab-on-piles is a bridge structure consisting of a continuous pile as a pier, pile head, and slab. Generally, the spun pile is chosen as the pile pier because of the quick construction and low maintenance. However, due to the hollow section with prestressed concrete, without filler, it has weakness in the form of brittle failure under bending moment and shear. Some studies mention that the initial failure occurs due to an explosion in the inner surface of the hollow spun pile or on the surface of the hole. The implementation spun pile for the slab-on-piles bridges should consider that behavior. Therefore, some practical engineers usually use concrete-infill treatment, however, the performance improvement in the nonlinear behavior needs to be known. This study investigates the use of hollow spun piles filled with concrete and normal reinforcement for a slab-on-piles bridge structure. This type of spun pile will be referred to as a reinforced concrete-filled spun pile (RCFSP). The location of slab-on-piles bridge is assumed to be built in Aceh, Indonesia. The height of the RCFSP on the slab-on-piles bridge is 6 m relative to the ground surface. A preliminary design using the linear elastic method is conducted using the response modification factor of 3.5. The slab-on-piles bridge requires 25 RCFSP for each bridge segment. Based on the pushover analysis method, this structure could not reach a performance point. A redesign is conducted using a response modification factor of 1.5. The redesign result shows that the structure requires 60 RCFSP and a performance point is found at a displacement of 85 mm in the longitudinal direction and 81 mm in the transversal direction. This research concludes that a slab-on-piles bridge is not efficient to be designed with a high value of response modification factor even though using the concrete-infill treatment.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/1244/1/012013
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2434538-6
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  • 9
    Online Resource
    Online Resource
    Sustainable cementitious materials: The effect of fly ash percentage as a part replacement of portland cement composite (PCC) and curing temperature on the early age strength of fly ash concrete
    EDP Sciences ; 2019
    In:  MATEC Web of Conferences Vol. 258 ( 2019), p. 01001-
    Details
    In: MATEC Web of Conferences, EDP Sciences, Vol. 258 ( 2019), p. 01001-
    Abstract: This research aims to determine the effect of fly ash percentage as a part replacement of Portland cement and curing temperatures to the early age strength of concrete. The percentages of fly ash used were 0, 10 and 15% by cement weight. The cured temperatures were 25, 30 dan 50°C. The concrete specimens were cubes of 150 x 150 x 150 mm3. The cubes, which were cured at 25°C, placed in water tank, while those cured at 30 and 50°C cured in oven until 7 days and then continued in water. The testing was conducted at ages 3, 7, 14 dan 28 days. The results showed that at early ages, the strength of concrete without fly ash cured at 25°C were higher than that of fly ash concrete. The higher level replacement of cement with fly ash, the lower strength of concrete obtained. The higher the curing temperature at earlier age resulted the higher the strength of concrete. The strength of concretes with 10% of fly ash cured at 25, 30 and 50°C at age three days were 15.111, 15.481 and 16.296 MPa respectively. Conversely, the strength of concrete that of cured at higher temperatures at ages 28 days, were lower than that of concretes cured at lower temperature. The results of this research also showed that fly ash could improve the workability of concrete.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    URL: Article
    DOI: 10.1051/matecconf/201925801001
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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  • 10
    Online Resource
    Online Resource
    Optimization of Reinforced Concrete Column Using Android- based Mobile Application
    EDP Sciences ; 2019
    In:  MATEC Web of Conferences Vol. 258 ( 2019), p. 02009-
    Details
    In: MATEC Web of Conferences, EDP Sciences, Vol. 258 ( 2019), p. 02009-
    Abstract: Reinforced concrete column has complicated calculations. Designer usually acts trial and error to get the optimum dimension and reinforcement according to the occurred loads. It takes long process and the result is not always be the most economical section. Nowadays smartphone with its various applications is very popular among societies. Besides being more flexible in place and time, smartphone has ease in operation and is commonly used by people. Hence, those advantages can be used to optimize reinforced concrete column quickly and accurately. The application named “C 2 App” (Concrete Column Application) had been created by accommodate regulation in Indonesia (SNI 2847:2013). Biaxial calculation used Bresler’s approach, while calculation of slender column applied Moment Magnification Method. The application is able to show interaction diagram, section drawing, and result tables. Moreover, the application was equipped with local database, and detailed calculations in pdf format to support the real project. Validation was done with computer-based software named CSiCol and ASDIP Concrete, whereas the optimization result was compared with other designs which used ACI Diagrams and Particle Swarm Optimization method. The application was pretty accurate and could provide a more economical section.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    URL: Article
    DOI: 10.1051/matecconf/201925802009
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2019
    detail.hit.zdb_id: 2673602-0
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