73 research outputs found
Experimental behaviour of beam-column connection using cold-formed steel sections with rectangular gusset-plate
No full textBeam-to-column connections setting up as isolated joint of cold-formed steel sections were tested up to failure. This experiment was conducted to observe the behaviour of connection in term of strength, stiffness and ductility. The type of connection used was rectangular gusset plate which stiffen the beam-to-column connection. The behaviour of the proposed connection was expressed with Moment-Rotation curves plotted from the experiment test results. The capacity of connections on this research were done in two ways: theoretical calculation by adopting Eurocode 3 BS EN 1993-1-8:2005 and experimental test results. The theoretical calculation of the moment capacit y of the proposed connection has found (Mj) to be 10.78 kNm with joint stiffness (Sj) amount to 458.53 kNm/rad. The experimental test results has recorded that the Moment capacity (Mj) of 15.68 kNm with joint stiffness (Sj) of 1948.06 kNm/rad. The moment ratio of theoretical to experimental amount to 0.69. The joint stiffness ratio of theoretical to experimental amount to 0.24
Pengaruh Variasi Jarak Tulangan Spiral Terhadap Perilaku Kolom Akibat Beban Aksial Konsentris Menggunakan Finite Element Analysis
No full text Columns are critical structural elements designed to resist axial loads and distribute them to underlying structural components. The use of spiral reinforcement as lateral confinement in cylindrical columns is known to enhance compressive strength and ductility. One of the parameters affecting the performance of spiral reinforcement is the spacing between the turns (pitch), which serves as lateral confinement. This study aims to investigate the effect of varying spiral reinforcement spacing on the stress and strain responses of cylindrical columns subjected to concentric axial loads, using finite element analysis (FEA). The modeling was conducted using Abaqus/CAE software, employing the Concrete Damaged Plasticity (CDP) model. Three different spiral reinforcement spacings were analyzed: 30 mm (K-30), 45 mm (K-45), and 60 mm (K-60). The numerical results include stress and strain responses, ductility, toughness, and failure patterns. The peak compressive strength (fcc) for K-30 was 70.960 MPa, for K-45 was 64.128 MPa, and for K-60 was 60.439 MPa. The toughness values were 1.508 J/mm3 for K-30, 1.796 J/mm3 for K-45, and 1.688 J/mm3 for K-60. The ductility values were 0.403 for K-30, 0.369 for K-45, and 0.394 for K-60. Observations of the failure pattern revealed that both K-30 and K-45 exhibited similar damage distributions, characterized by red-colored stress concentrations that were evenly distributed along the surface of the column cover. In contrast, K-60 showed damage primarily on the cover in the central area of the column
ANALISIS PERANAN KEPEMIMPINAN DALAM MENINGKATKAN KINERJA PEGAWAI PADA DINAS KESEJAHTERAAN SOSIAL PROVINSI BENGKULU
No full textPenelitian ini bertujuan untuk mengetahui peranan kepemimpinan dalam medngkrd(e kirErb
Fgorai di Dbas Kcs€jahteret Sosiol Provimi Benghulu.
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dengan mcngun l(atr trknik wawancara, observasi datl dokunqraasi. Penelitian ini dilaksanakd di Dinas KasejaheEan Sosial Provinsi Bengkulu.
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pc)€babnya dikarqEkar rcs?onden baru pindah ke Dirus KesejdhFrran Sosial Prcvinsi dan behnn sernpat bersosialisai dargan bewahan maupun rekan-rekan kerja yang lairu Pinpinan di Dinas Kesejahterran Sosial Provinsi Bo4h u tidak
pemeh menbedkan s.atun kepada bewalun age mcmiliki rasa rEfilrh diri dahtrl b€kerja yang diuhoakao oleh
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baik dan tepat walcu 2) Pimpinan di Dinas Kesejrhreraan Sosial Provinsi Bengh u tidak p€nah oemberikan arahar! kepoda ba*rhan aga. sehlu taat be.ibodah baik dirumah araupun dihntor. Hal fui dikarclon pennasalahar ibodah kepada Tuhan adalah rmrsan diri masing-masing 3) Pinpiaan di Dinas Kesejalfieraatr S6irl hovinsi Bengkulu selalu m€mberikan k€s€rpotm k€pada boEahar unn* mqiu dan berkemborg baik untuk dikantc ataupun dalam kehidupan pribadi. 4) Pegawai di Dinas Kesqiahteraan Sosial Provinsi Bergkulu mengeoai rurjfu kesahhan mereka dahm melakranala[ tugas masih dalsrn batasb6tas kewajatar dar tidak begiul fatal. I{al ini merupakan kewajaran sebegai manusia karena maausia tidak luput dari k€salahaa. Ilanya s4ja mereka harus mau
untuk terus belqiar lagi sehingga k€depainya marjin kes.lalnm dalam penyelesaiar pek€rjaan dapat dimtuinalisir. 5) Hasil p€nyelesaian pek€xjaan di
Dinas Kesejahteraln Sosial hovinsi Beogkulu sudah sesui dengan ta.get kcija/ rEncana kerja
Knowledge cluster formation as a science policy: lessons learned
No full textRegional science policy aims at the creation of productive knowledge clusters, which are central places within an epistemic landscape of knowledge production and dissemination, K-clusters are said to have the organisational capability to drive innovations and create new industries. The following paper will look at Malaysia, Indonesia and Vietnam and their path towards a Knowledge-based economy. All governments have used cluster formation as one of their development strategies. Some evidence on the current state of knowledge cluster formation is provided. If the formation of a knowledge cluster has been the government policy, what has been the result? Is there an epistemic landscape of knowledge clusters? Has the main knowledge cluster really materialised? Data collected from websites, directories, government publications and expert interviews have enabled us to construct the epistemic landscape of Peninsular Malaysia and the Mekong Delta of Vietnam. Several knowledge clusters of a high density of knowledge producing institutions and their knowledge workers have been identified and described. An analysis of the knowledge output, measured in terms of scientific publications, patents and trademarks show that knowledge clusters have, indeed, been productive as predicted by cluster theory, though the internal working of clusters require further explanation.Science policy; knowledge and development; knowledge-based economy; knowledge clusters; knowledge corridors; Malaysia; Vietnam
A low percentage of autologous serum can replace bovine serum to engineer human nasal cartilage
No full textFor the generation of cell-based therapeutic products, it would be preferable to avoid the use of animal-derived components. Our study thus aimed at investigating the possibility to replace foetal bovine serum (FBS) with autologous serum (AS) for the engineering of cartilage grafts using expanded human nasal chondrocytes (HNC). HNC isolated from 7 donors were expanded in medium containing 10 concentrations (2 serum-free medium or in Hyaff (R)-11 meshes using medium containing FBS or AS. Tissue forming capacity was assessed histologically (Safranin O), immunohistochemically (type II collagen) and biochemically (glycosaminoglycans - GAG- and DNA). Differences among experimental groups were assessed by Mann Whitney tests. HNC expanded under the different serum conditions proliferated at comparable rates and generated cartilaginous pellets with similar histological appearance and amounts of GAG. Tissues generated by HNC from different donors cultured in Hyaff (R)-11 had variable quality, but the accumulated GAG amounts were comparable among the different serum conditions. Staining intensity for collagen type II was consistent with GAG deposition. Among the different serum conditions tested, the use of 2 in the lowest variability in the GAG contents of generated tissues. In conclusion, a low percentage of AS can replace FBS both during the expansion and differentiation of HNC and reduce the variability in the quality of the resulting engineered cartilage tissues
Structural behaviour of slip-in gusset plate connection for double lipped channel cold formed steel using partial strength connection
No full textCommonly, the cold-formed connection used screwed joint that advantages in simple and fast installation. However, the screw connections should have many problems when it applied for primary structure such as beam and column. To solve this problem, it can be applied the bolted connections using slip in gusset plate as primary structure. The aims of this paper to study the behaviour slip-in gusset plate connection for double lipped channel C20024 using sub-assemblage frame test. The proposed of connections were rectangular gusset plate (RG) and haunched gusset plate (HG). The failure mode, moment resistance, classification connection and discussion will be presented in this paper. The failure mode of bearing bolt CFS was occur for isolated joint test specimens. All of specimens sub-assemblage frame test have similar failure modes where the beam had lateral torsional buckling. The moment resistance of sub-assemblage frame test for RG connection was 13.17 kNm and HG connection was 17.76 kNm. The classification of strength for all sub-assemblage frame test specimens test were classified as partial strength connection
Fundamental studies of combustion of droplet and vapour mixtures
No full textThere are few experimental data of a fundamental nature that clearly demonstrate the similarities and differences in burning rates between single phase and two phase combustion, either in laminar or turbulent conditions. Such data are essential towards a better understanding of the spray combustion phenomena as well as a whole system. In the present study, experimental investigations of combustion
of droplet and vapour air mixtures under quiescent and turbulence conditions have been conducted in a fan stirred combustion vessel. Aerosols were generated by expansion of gaseous pre-mixture to produce a homogeneously distributed
suspension of fuel droplets. Spherically expanding flames following central ignition were employed to quantify the flame structure and propagation rate. The effect of
droplets on flame propagation was investigated by comparing the burning rate of gaseous mixtures at initial pressure and temperature close to those of aerosol mixtures.
In quiescent conditions, aerosols of two different fuels, isooctane and ethanol, were investigated at near atmospheric conditions. The effect of fuel droplets, up to 31 J.1m diameter, on laminar flame propagation was examined at a wide range of equivalence ratios. In the early stages of flame development, inertia of fuel droplets leads to local enrichment in equivalence ratio which increases the
initial burning rate of lean aerosols but decreases that of rich ones. For the later stages of flame propagation, the presence of liquid droplets causes earlier onset of
instabilities and cellularity than for gaseous flames, particularly at rich conditions. This leads to an enhanced burning rate and is probably due to heat loss from the
flame and local disturbances due to droplet evaporation and subsequent diffusion processes.
In turbulent studies, the effect of isooctane droplets up to 14 J.1m in diameter
on flame propagation was examined at various values of root mean square turbulence velocities between zero and 4.0 mls. It is suggested that during early flame development, the turbulence was found to induce droplet motion before flame
initiation which dominated over those resulting from the flame, negating the effect of droplet inertia. In the later stages, the presence of droplets in a low turbulent
flame resulted in a significant burning rate enhancement. However, this enhancement became progressively less important as turbulent wrinkling became dominant. Between low and high turbulence, there was a transition regime between instability dominated and turbulence dominated regimes. As a consequence, the burning rate enhancement due to droplets under this transition range was rather
complex
Peran Kemaritiman Dalam Memperkuat Perekonomian Indonesia
No full textThis study examines the role of Indonesia's maritime sector as a driver of sustainable economy. Indonesia as an archipelagic country has a strategic location. Indonesia plays an important role in global trade and geopolitics through the contribution of the fisheries, maritime transportation, and marine tourism sectors. Improving port infrastructure and optimizing the Indonesian Archipelago Sea Lanes supports logistics efficiency and attracts investment, while implementing the right defense strategy improves maritime security. The method used is a literature study, namely the collection and analysis of information from various written sources systematically. The research process is carried out in four stages: recording findings related to research problems, combining data and theories, comparative analysis between sources, and criticism to generate new ideas. The results of the study show that the synergy between maritime policies, infrastructure improvements, and integrated defense strategies can drive Indonesia's transformation into an inclusive and sustainable global maritime economic center
Response of irrigated direct-seeded rice yields to different nitrogen rates and precipitation patterns
No full textIn Peninsular Malaysia, irrigated direct-seeded lowland rice cultivation results in higher yields during the off-season (April-July) as compared to the main-season (October-January). However, farmers still apply the same amount of nitrogen (N) at both growing seasons. A study was conducted to assess the response of rice yield components to different N rates and different precipitation patterns. This work was conducted in a 27-acre field with six N treatments, i.e. 0, 80, 120, 160, 200 and240 kg N ha-1 in three continuous planting seasons from October-2012 to January-2014. In the first planting during main-season (S1), treatment with 120 kg N ha-1 showed significantly higher panicle number per m2 (PM), 1000-grain weight (GW)and estimated grain yield (GY). Meanwhile, treatment with 200 kg N ha-1 significantly increased panicle number m-2, spikelet number per panicle (SP), percentage of filled spikelet (FP) and estimated grain yield (GY) in the second planting during off-season (S2). In the third planting during main-season (S3), 120 kg N ha-1 still showed significantly higher PM, spikelet number per m-2 (SM), GW and GY. S3 showed the highest grain yield per input of N, followed by S1 and S2. In all three seasons, grain yield was positively correlated with PM, SP and SM. This study indicates that 120 kg ha-1 produces the highest grain yield during the main-season, which typically receives more rain water that contributes additional N to the rice field throughout the planting season. During the off-season, however, 200 kg ha-1 is required as the optimal N rate
Leading Teaching and Learning in the Era of Education 4.0: The Relationship between Perceived Teacher Competencies and Teacher Attitudes toward Change
No full textAbstract: The objective of the survey was to examine the relationship between perceived teacher competencies in the era of Education 4.0 (TCEdu4.0) and teacher attitudes toward change (TATC) in Malaysian secondary schools. A total of 1,293 teachers from 80 secondary schools that were chosen using disproportionate stratified sampling method completed the questionnaires with valid data. The results demonstrated that, i) there was a significant, positive and strong correlation between TCEdu4.0 and TATC; and ii) except Functional and Research Competency, Self-Management and Interactive Competency, Leading Learning and Mentoring, Problem Solving, Technological and Digital Competency, and Pedagogical Psychology and Assessment were the five predictors of TATC that contributed 49.20% to the total variation. The study re-affirms the practicality of the competency and planned behavioural theories, provides evidence that teacher’s individual factor is a major determinant of attitudes toward change. Moreover, it expands the understanding among educational practitioners regarding the interplay between these two variables and is a significant resource for Institut Aminuddin Baki in developing future training programmes for school leaders in enhancing TCEdu4.0 and TATC. In summary, the study offers valuable insights for driving school change effectively that sustainable school change is correlated to individual factors
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