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Biocompatibility of Silicone Elastomer Incorporated with Chitosan: Morphology, Mechanical, Biodegradation Assessment and the Potential for Injectable Biomaterials
No full textOne of the major concerns associated with the use of silicone material is microorganisms and fungal growth which can result in degradation of the material, inflammation, and chronic infection. Thus, the development of antimicrobial silicone elastomer is becoming necessary. The aim of this study was to evaluate the effect of adding different concentrations of chitosan particles into the silicone matrix. The samples were characterized using a Universal Testing Machine (UTM), Scanning Electron Microscopy (SEM), MTT Assay, antibacterial and hydrolytic material degradation for a month. The addition of 50% chitosan recorded the highest value in the pore area of 29.282 with the widest zone of bacterial inhibition of 6.4 ± 0.4 mm as well as the highest% cell viability of 80.08 ± 1.21%, the furthermore, the shortest lifetime predicted from biodegradation test was around 36 weeks
Analysis of the Effect of Porosity on the Acoustic and Elastic Properties of Materials Using Ultrasonic Immersion Pulse-Echo Technique
No full textThe material properties is an important aspect in determining the potential application of a material. Hence, this study is carried out to determine the effect of porosity on the material properties (acoustic properties and elastic properties) of material using the pulse echo immersion ultrasonic technique. This study comprises of two acoustic properties (longitudinal velocity and acoustic impedance) and five elastic properties (Young's modulus, shear modulus, bulk modulus, longitudinal modulus and Lamé constant). Two types of PMMA samples are used for this study; nonporous sample and porous sample. The result indicated that the material properties (acoustic properties and elastic properties) of porous sample are less than the material properties of non-porous sample. It indicated that the porosity gives significant effect towards the material properties.
Improving The Integration and Connectivity of Feeder Wira Wiri, Suroboyo Bus, Trans Semanggi Bus, and Trans Jatim Bus in Surabaya City Purabaya-Rajawali Routes
Get PDFSurabaya City has several public transportation such as Feeder Wira Wiri and Suroboyo Bus managed by Surabaya City Government, Bus Trans Semanggi managed by the Ministry of Transportation of the Republic of Indonesia, and Bus Trans Jatim managed by East Java Provincial Government. Based on observations in Purabaya-Rajawali routes, these public transportation services have yet to achieve maximum integration between modes, hence requiring analysis to improve the integration and connectivity of these public transportation systems. This analysis assesses customer satisfaction regarding the integration and connectivity of Feeder Wira Wiri, Suroboyo Bus, Trans Semanggi Bus, and Trans Jatim Bus along the Purabaya-Rajawali routes in Surabaya City. The methods used Customer Satisfaction Index (CSI) to calculate user level of user satisfaction and Quality Function Deployment (QFD) used by integrating Importance-Perfomance Analysis (IPA) and Kano model. From the analysis results, the satisfaction level indicates a value of 68.01% (satisfied). So, it is needed to improve existing attribute integration. From this analysis, 11 technical responses were obtained to improve integration attributes. The final result of this research indicates that 11 improvements of integration attributes can be implemented in the integration system between services of Feeder Wira Wiri, Suroboyo Bus, Trans Semanggi Bus, and Trans Jatim Bus in Surabaya City Purabaya-Rajawali routes
A Study on the Livelihood Sources and Welfare Levels of Small-Scale Fishing Households in Tapanuli Tengah Regency, Sumatera Utara
Get PDFIndonesia is known as an “undersea paradise” because of its extraordinary wealth of marine biodiversity and fishery resources. With this nickname, coastal communities should have a decent life. However, in reality, their welfare is not in line with the wealth of marine resources, especially for fishermen. The lives of fishermen are often colored by economic challenges, weather uncertainty, and environmental changes that impact their welfare. This study aims to identify sources of livelihood, identify levels of welfare, and identify livelihood strategies carried out by fishing households. Through a survey that we conducted on 35 small-scale fishing households on the West Coast of North Sumatra, we found that most of them were still classified as less prosperous. Although the livelihood analysis shows that their sources of income are quite diverse, the contribution of income outside of fishing has not been able to improve their level of welfare. The results of this study also show that fishermen are not a passive group of people. Realizing the uncertainty in their livelihoods, they try to take advantage of existing opportunities by implementing livelihood strategies. The livelihood strategies carried out by fishermen are classified into economic dimensions, ecological dimensions, and social dimensions
Kesiapan Aktor Dan Kebijakan Dalam Mewujudkan Smart Mobility Di Provinsi Bali
Get PDFBali saat ini menghadapi berbagai tantangan, seperti kemacetan parah, ketimpangan sosial dan ekonomi, serta sistem administrasi yang kurang efisien, yang mempengaruhi kualitas hidup masyarakat. Oleh karena itu, Bali perlu bertransformasi menjadi smart city untuk mengatasi permasalahan tersebut, salah satunya penerapan smart mobility yang dapat mengintegrasikan transportasi umum dan mengurangi ketergantungan pada energi tidak terbarukan. Keberadaan smart mobility dapat menyelesaikan permasalahan sektor transportasi yang disebabkan oleh keterbatasan integrasi transportasi umum dan pemilihan moda dengan energi tidak terbarukan. Dalam mewujudkan smart mobility perlu diinisiasi oleh keberadaan aktor dan kebijakan, sehingga penelitian ini mencoba menganalisis peran aktor dan kebijakan yang terlibat dan peran kebijakan, kekuatan, kepentingan, hubungan keterkaitan aktor dan kebijakan dalam mewujudkan smart mobility, dimana membutuhkan pendekatan terstruktur untuk memahami dinamika antar aktor, kebijakan yang berlaku, serta kekuatan dan kepentingan yang saling memengaruhi. Sumber data pada penelitian ini didapat dari data sekunder berupa dokumen perencanaan serta dilakukan verifikasi melalui diskusi terbatas dengan pemangku kepentingan. Berdasarkan analisis terhadap kebijakan, menunjukkan bahwa kebijakan terkait smart mobility di Provinsi Bali telah memenuhi seluruh komponen pembentuk smart mobility di Provinsi Bali. Pada analisis peran aktor yang memiliki kapabilitas dan kepentingan tinggi antara lain Inna Group, Komite Kendaraan Listrik, Dishub, PLN, dan GIZ. Berdasarkan analisis dimulai dengan identifikasi aktor dan kebijakan dan keterkaitan kebijakan dan aktor menunjukkan bahwa seluruh aktor dan kebijakan di Provinsi Bali sudah memiliki kapasitas untuk mewujudkan smart mobility. Keberadaan penelitian ini sangat dibutuhkan untuk mengidentifikasi kesiapan implementasi smart mobility pada suatu wilayah administrasi pemerintahan. Pentingnya peran Aktor dan kebijakan dalam mendukung implementasi program smart mobility, sehingga hasil penelitian ini dapat dipergunakan pemerintah sebagai dasar penyelenggara smart mobility di Provinsi Bali
The Role of Merak Vessel Traffic Service (VTS) in the Implementation of Traffic Separation Scheme (TSS) in Sunda Strait
Get PDFMerak Vessel Traffic Service (VTS) is pivotal in Indonesia's critical maritime traffic network, particularly within the bustling Sunda Strait. This waterway holds immense strategic importance, serving as the primary link between Java and Su-matra Islands and intersecting with the vital Indonesian Archipelago Sea Lane. The Indonesian Government implemented a Traffic Separation Scheme (TSS) in July 2020 to enhance safety and navigation. Despite three years of TSS implementation, concerns persist regarding compliance and safety within the Sunda Strait. This research employs qualitative methods to address these concerns, chiefly in-depth interviews with VTS operators. The overarching objective is to gain profound insights into the intricacies of TSS implementation and the array of challenges it faces. The findings reveal several significant challenges. These include the lack of robust law enforcement and insufficient socialisation efforts regarding TSS regulations, concerns related to weather conditions impacting maritime operations, limitations in VHF radio modulation affecting communication, and issues surrounding vessel compliance with directives from VTS operators. In light of these challenges, future recommendations should prioritise strengthening law enforcement mechanisms, intensifying educational initiatives, improving communication technology, enhancing weather monitoring capabilities, and exploring ways to strengthen vessel compliance with VTS instructions.
Analysis of the Effect of Nano-Alumina Addition on Epoxy Coating on Abrasive Resistance, Adhesion Strength, and Corrosion Rate of ASTM A36 Steel Plate
Get PDFThe maritime industry is one of the natural resources management industries that uses steel as its fundamental component. Much research and development have been conducted to increase the quality and life span of the steel used. ASTM A36 low-carbon steel is one of the steel variants commonly used on offshore structures because of its advantages. This research was conducted to achieve the additional effect of nano-alumina of 0%, 1,5% and 3% in the epoxy coating on adhesive strength, abrasive resistance and corrosion rate prediction. At pull-off testing, the highest adhesion strength was obtained at a mixed variation of 0% with a value of 7,7022 MPa. At the abrasion resistance test, the highest abrasion resistance was obtained at a mixed variation of 3% with a value of 16.7 grams. The lowest value of the corrosion rate prediction test was obtained on the mixed variation of 1.5% with a value of 0.005410622 mph
Effectiveness of GPCA in Reducing Data Dimensions and its Application to Human Development Dimension Indicators Data
Get PDFAnalysis of human development growth at the regency/city level is challenging because the data is high-dimensional, indicators are correlated, and the regencies/cities are correlated. In this study, we propose a Generalized Principal Component Analysis to analyze human development growth by reducing the dimensions of regency/city and indicator. Thus, human development growth at the regency/city level is analyzed using the GPCA results in Biplot to describe each regency/city and its indicators. This study aims to evaluate GPCA in reducing the dimensionality of data whose observations are correlated, and indicators are correlated through simulation and empirical study; to analyze the growth of human development at the regency/city level based on the results of GPCA-Biplot. This research shows that GPCA works well in reducing data dimensions from correlated observations and correlated variables. Based on the results of the GPCA-Biplot visualization, the growth of human development in the Nduga regency from 2019 to 2022 showed significant fluctuations. Although some indicators show progress, especially in 2021, significant challenges remain. In the same way, the growth of human development in each regency/city can be analyzed. Thus, government policy focuses on real problems in the field
Analisis Faktor Kinerja Peserta Magang melalui aspek Motivasi dan Fasilitas: Studi Kasus di PT United Tractors Tbk
Get PDFPenelitian ini bertujuan untuk menganalisis faktor- faktor yang mempengaruhi kinerja peserta magang di PT United Tractors Tbk dengan memfokuskan pada motivasi kerja dan fasilitas kerja. Penelitian dilakukan sebagai bagian dari evaluasi efektivitas program Magang Kampus Merdeka oleh Kementerian Pendidikan Indonesia. Metode Analisis Faktor dengan bantuan perangkat lunak SPSS digunakan untuk mengidentifikasi faktor-faktor utama yang mempengaruhi kinerja peserta magang berdasarkan data dari partisipan magang dan pengelola program. Hasil penelitian menunjukkan bahwa motivasi kerja dan fasilitas kerja memiliki peran krusial dalam meningkatkan kinerja peserta magang, dengan implikasi penting untuk pengembangan kebijakan dan praktik manajerial di lingkungan industri. Temuan ini mendukung pendekatan pendidikan berkelanjutan untuk mempersiapkan generasi yang kompeten menghadapi tantangan masa depan
The Utilization of Ethanol as Antisolvent to Enhance the Glucomannan Content of Tuber of Amorphophallus muelleri Blume
Get PDFPorang (Amorphophallus muelleri Blume) is widely found in Indonesia. The high Glucomannan (GM) content in Porang (Amorphophallus muelleri Blume) compared to other tubers becomes the main advantage of Porang. Glucomannan is a low-calorie fibre polysaccharide with a β-1,4 bond composed of D-glucose and D-mannose. However, its Calcium Oxalate (CaC2O4) content is an issue and should be minimized when consumed. The research focused on increasing the GM content of raw Porang tuber donated from PT ABS., Bogor. Initially, the rawmaterialwas roughly sliced and soaked in NaCl solution (10% or 15 %-w), washed with gently warm water (approx. 40 °C), and air dried to result in Crude Konjac Flour (CKF). Further purification of CKF will produce Konjac Glucomannan (KGM). The KGM has a higher content of glucomannan. Ethanol (EtOH) was used as an antisolvent in the purification step. The final product of KGM was analyzed regarding GM, calcium oxide, moisture, and ash content. A 15%-w of NaCl solution followed by warm water washing could reduce the 59% content of Calcium Oxalate. Meanwhile, further purification using 50% EtOH increased 627.85% GM content from their initial value in Porang tubers. Hence, the treatment combination of NaCl-warm water washing and EtOH purification maximally removes calcium oxide and increases the GM content in the KGM