45 research outputs found
Study on mechanical and physical properties of composite materials with recycled PET as fillers for paving block application
No full textTechnical and Environmental Performance Evaluation of Fuel Switching from Coal to Biomass Wood Chip in Circulating Fluidized Bed Boiler
Get PDFPresidential Regulation No. 112 of 2022 regulates the preparation of a road map to accelerate the termination of operating time for steam power plants (PLTU). Biomass’s potential to reduce emissions compared to coal explains why PLTU was chosen for this study. The operation of a PLTU requires the replacement of non-renewable electricity fuel sources with renewable ones. PLTUs are dominated by the use of coal. In accordance with presidential regulations, this research carried out fuel switching from coal to biomass. This research was conducted at PLTU Bolok, Kupang Regency. PLTU Bolok has a capacity of 2×16.5 MW. Fuel switching from coal to wood chip biomass in a Circulating Fluidized Bed (CFB) type boiler was carried out directly (direct co-firing), with five combustion treatments, namely, 100% coal and 0% biomass, 75% coal and 25% biomass, 50% coal and 50% biomass, 25% coal and 75% biomass and 0% coal and 100% biomass. The results of this research show that the performance of the biomass fuel switching caused the PLTU unit to experience a derating of 2 mW/hour. The results of other parameter analysis are FEGT 845.33 °C, furnace pressure -35 Pa and furnace temperature 947.04 °C. NOx emissions were reduced by 11.3 mg/Nm3, SO2 by 45.8 mg/Nm3 and CO2 12.5 mg/Nm3. The environmental benefit is the reduction emissions
Microstructure and Adhesion Properties Post-Annealed Metallic Coating of Fecrbmnsi on Tube and Internal Structure Coal-Fired Boiler
No full textPrecipitation Hardening Formation in Mg6Zn0.5Y Alloy as an Engine Block Application
No full textMagnesium alloys have been widely applied in the automotive world cars or motorcycles and aircraft engines. This is because the weight of the magnesium itself is very lightweight and have high strength. And magnesium alloys have good thermal conductivity, high elastic modulus and good mechanical properties. Magnesium in engineering applications is usually in the mix with elements such as Al, Ag, Mn, Zn, Si, Zr and RE (rare element). Magnesium alloys with zinc are mostly found and used. This research has been carried out precipitation hardening treatment-Mg alloy-0.5Y 6Zn using variable temperature 150oC, 175oC and 200oC with a holding time of 12 hours, 24 hours and 36 hours. The results show microstructure formed is αMg, MgZn, and Mg3Zn6Y (i-Phase). The formation of precipitates during the process of aging raise hardness values up to 75.8 BHN. Aging treatment reduces the thermal resistance of the alloy Mg-6Zn-0.5%Y.</jats:p
Pengaruh NiCrAlY, Ni/Cr2O3/CrxCy Sebagai Variasi Bond Coat Dengan Penambahan Lapisan Al2O3 dan YSZ Pada Inconel 625 Terhadap Struktur Mikro Lapisan Menggunakan Metode Flame Spraying
No full textThermal Barrier Coating (TBC) berfungsi untuk mengurangi temperatur substrat serta meningkatkan daya tahannya terhadap korosi dan oksidasi. Pada penelitian ini, digunakan flame spraying dari variasi bond coat (Ni-Cr-Al-Y), (Ni/CrO3/CrXCY) dan tanpa bond coat serta melapisi kembali lapisan bond coat dengan Al2O3 dan ZrO2 – 8%Y2O3 sebagai Thermal Barrier Coating untuk diteliti pengaruhnya terhadap struktur mikro lapisan yang terbentuk. Hasil flame spray diamati dengan SEM pada variasi bond coat NiCrAlY ditemukan beberapa serbuk dari material top coat dengan beberapa kondisi yaitu meleleh (melted), meleleh sebagian (semi melted), dan tidak meleleh (unmelted). Ditemukan poros yang merata hampir di seluruh permukaan sampel dan munculnya pengintian retak. Perbedaan sebelum dan sesudah perlakuan ada pada persebaran setiap unsur di setiap spesimen, dan lapisan oksida yang terbentuk pada seluruh variasi bond coat </div
KEPEMIMPINAN KEPALA MADRASAH DALAM PERSPEKTIF MANAJEMEN BERBASIS SEKOLAH SEBAGAI AKSES PENDIDIKAN BERKUALITAS DI ERA INDUSTRI REVOLUSI 4.0
Get PDFEducation in the era of the industrial revolution 4.0 should form people who are dedicated to the system, but the education system in several educational institutions in reality there is still an opportunity for someone to take actions that are not in accordance with the regulations made by the educational institution such as professional and quality institutional management. , thus providing the impact of changes in an educational process system. This quality education process, it has implications for the direction and progress of an educational institution. This is where the role of a madrasa principal plays an important role. The data collection method in this study uses library research. In this case, it is a variant of qualitative research, data collection can use observational interviews and documentation. At this stage, the researcher tries to select data (books) that have relevance to the leadership of the madrasah principal in the perspective of MBS as access to quality education in the era of the industrial revolution 4.0. In this paper, in analyzing this paper with a hermeneutic approach, the author describes behind the text there is a context meaning or behind the explicit meaning, there is an explicit meaning if interpreted literally it can be interpreted as interpretation or interpretation. This method step is intended to capture the meaning, values and intentions of the madrasa principal's leadership in the MBS perspective as access to quality education in the era of the industrial revolution 4.0. Then the author also uses synthetic analysis which means the stages of an object of scientific study that link an articulation of one meaning with another meaning which is then found a knowledge with a new articulation in the form of the leadership of the head of the madrasah in the perspective of MBS as access to quality education in the era of the industrial revolution 4.0.
Keywords: Leadership of Madrasah Principals, SBM Perspective, Quality Education, Industrial Era 4
Model Pengembangan Pembelajaran PAI di Sekolah Melalui Berbagai Pendekatan
No full textAbstract:The learning of Islamic education today is at the heart of the character formation of learners. Because true education changes the way people view from bad to good, from being unable to be from unable to be able. With PAI learning model in School through various approaches expected education process in effort of character formation can be optimal. This research is a qualitative research using library approach, which is an approach that examines and uses literature as reference and reference in managing data. In this case the object is the model of PAI learning development in schools through various approaches.Methods of data collection in this study using literature study. In this stage, the researcher seeks to select the data (books) that have relevance to the model of PAI learning development in schools through various approaches. Then the author also uses synthesis analysis that is with the handling of certain scientific objects by combining the meaning of one with another understanding, which ultimately can be obtained new knowledge that is the urgency of the library as an effort to reduce the behavior of students' deviations in school. The author also uses content analysis that is research conducted on the information documented in the recording, good pictures, sounds, writings and others. With this method will be done data analysis and processing scientifically about the contents of the writing model of learning development of PAI in schools through various approaches.The results showed that in the development of learning PAI there are several models such as Faith Approach, Approach Experiences, Approach Habituation, Rational Approach, Emotional Approach, Functional Approach, Exemplary Approach, and others
Pengaruh Komposisi Material Biokomposit dengan Matriks Polyester Berpenguat Serat Alam Terhadap Kekuatan Mekanik dan Fisik
No full textPenelitian ini dilakukan dengan tujuan untuk mengetahui pengaruh komposisi serat alam dalam komposit polymer terhadap kekuatan lentur dan densitas dari biokomposit dengan matriks polyester berpenguat serat rami, serat bambu betung, dan serat tebu. Dilakukan pengujian mekanik berupa pengujian kekuatan lentur dan melakukan perhitungan densitas sebagai pengujian fisik. Komposisi matriks dengan penguat seratnya diatur sebesar 70% polyester dan 30% serat alam. Sebagai varibel yang digunakan pada penelitian ini adalah membuat dominasi komposisi jenis serat dalam bentuk jumlah berat yang yang terukur sehingga menghasilkan perbandingan jenis serat alam mana yang mempunyai nilai pengujian yang lebih baik. Dari hasil pengujian kekuatan lentur didapat bahwa biokomposit dengan dominasi serat tebu mempunyai nilai kuat lentur terbesar dengan 261,66 kg/cm2 sedangkan biokomposit yang didominasi rami dan bambu secara berurutan menghasilkan kuat lentur sebesar 101,465 kg/cm2 dan 185,89 kg/cm2 . Hasil perhitungan densitas menunjukkan densitas tertinggi dicapai oleh material biokomposit dengan dominasi komposisi serat rami ( 70% Polyester : 20% Serat Rami, 5%Serat Bambu 5%Serat Tebu) sebesar 1,049 g/cm3
INFLUENCE OF INTERNAL GEOMETRI ON MECHANICAL PROPERTIES OF 3D PRINTED POLYLACTIC ACID (PLA) MATERIAL
No full text<p>Three dimensional (3D) printing technologies have been developed within recent decades and have been demanding for today practical application because of its advantages such as low cost production and easy and simple to use. However, there are still weaknesses in the printing result and processing, including the process efficiency, limited resolution especially for complex design of resulted product, and optimization of the mechanical properties of the filaments used. This study aimed to analyze the effect of variations in the internal geometry on the mechanical properties of 3D printed object using PLA materials. The printed object varied by geometrical shapes and thickness of each geometry. Internal shape geometry used is a triangle and honeycomb, with variations in the size of each symmetry axis of the goemetry are 4.5 mm and 9 mm, and the thickness variation between objects are 1 mm and 2 mm. Test results show that the best performance obtained by measuring its tensile and flexural strength is the sampel with triangle geometry of 9 mm geometrical size and 2 mm of thickness. The tensile strength and flexural strength values of the object are 59.2996 MPa and 123 MPa respectively.</p>
