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ANALISIS STRUKTUR NOSEL RX 320 DENGAN MENGGUNAKAN BAHAN S45C
No full textPada bulan Mei 2008 serta bulan Juli 2008 telah dilakukan uji terbang roket RX 320. Walaupun hasil uji terbang yang telah dilakukan cukup baik, namun masih diperlukan perbaikan, baik desain maupun proses pembuatannya agar lebih ringan serta lebih mudah proses pemasangannya. Pada bagian sisi masuk, hanya menerima beban tekanan saja karena bagian tersebut dilindungi dengan grafit, sedangkan bagian divergen hanya menerima beban temperatur saja, sehingga analisis yang dilakukan disesuaikan dengan beban yang diterima struktur nosel tersebut. Dari simulasi beban tersebut diperoleh tegangan yang terjadi pada kedua bagian nosel tersebut, faktor keamanan bagian konvergen akibat pengaruh tekanan sebesar 4 atm sedangkan bagian divergen yang menerima beban temperatur sebesar 1.7, sehingga tegangan terbesar sesuai dimensi roket yang dibuat adalah pada bagian divergen akibat pengaruh temperatur
Teologi Kontekstual dalam Budaya Simalungun: Analisis Pemanfaatan Ajaran Kristen dalam GKPS, 1963-2003
No full textThis study examines the importance of faith in God as the creator and preserver of culture, critical evaluation of destructive forces in culture, cultural restoration and preservation revial of excellent, cultural accomplishment. This study will also discuss the background, the role of GKPS in the transformation of local Simalungun culture and examples of local Simalungun cultural transformation. Simalungun is one of the ethnic groups that fiemy uphold particularly through the concept of ahap hasimalungunan. Ahap hasimalungunan is an important factor in the foundation of GKPS. Protestant Christian doctrices have been present in the Land of Simalungun since the 19th century, yet its part in local culture has not been broadly explored. This study analyzes the transformation of Protestant Christian teachings on local Simalungun culture through the Simalungun Protestant Christian Church (GKPS) in the period 1963-2003. GKPS, which employs local culture as a strategy of evangelism in Simalungun, is significant factor in endeavors to accelerate evangelism in Simalungun. The inception of Protestant Christian theological doctrinesy was begun mode of teaching faith and educating the Simalungun ethnic community in the realm of reforming the worship and educational systems
From Renaissance To Robot: Paradigm Shifts In Visual Art
No full textThis paper investigates the paradigm shifts in art from the Renaissance to the contemporary digital age, emphasizing how technological innovation has redefined the value, function, and perception of art. During the Renaissance, art embodied humanistic ideals and served as a medium of communication between the artist and the audience through form, symbolism, and mastery of technique. In contrast, the advent of machines, robotics, and artificial intelligence has transformed the processes of creation, authorship, and aesthetic judgment. These developments challenge traditional notions of artistic authenticity and raise questions about the evolving relationship between human creativity and algorithmic generation. By tracing the historical continuum from the Renaissance’s pursuit of perfection to the AI era’s pursuit of simulation and automation, this study critically examines how the meaning and worth of art have been renegotiated. It concludes by calling for a re-examination of art education to sustain authenticity and critical engagement in an age where human and machine creativity increasingly intersect
Interdisciplinary Research Burden in Islamic Studies and Action from Academic Librarian
No full textInterdisciplinary research is increasingly recognized as a crucial approach to addressing the complexity of religious and social issues in regional and global contexts. However, the implementation of such research often encounters significant challenges, particularly in fields like Islamic Studies. Despite its potential, integrating diverse disciplines into Islamic Studies research is not always successful due to various obstacles. With their unique expertise and role as "connectors," academic librarians are well-positioned to facilitate this interdisciplinary growth. This paper examines the challenges faced in interdisciplinary research within Islamic Studies and explores the potential involvement that academic librarians can use to overcome these barriers. Researchers employ a literature-based method involving stages of designing, collecting, analyzing, and presenting research to examine the challenges in interdisciplinary studies. The results reveal two primary types of burdens: scientific and practical. Scientific burdens include limitations in researchers' knowledge, difficulties in integrating disciplines, and an overemphasis on the original discipline. Practical burdens include implementing interdisciplinary curricula, navigating bureaucratic procedures, accessing research facilities, finding relevant information sources, and preparing research proposals. Academic librarians play a crucial role in addressing these practical burdens by optimizing policies, providing relevant collections and access, and developing advanced facilities and services. The study concludes that for effective interdisciplinary research, it is essential to recognize and address these burdens, leveraging the support and resources provided by academic librarians to enhance the research process
SUATU TINJAUAN PEMANFAATAN KAYU HUTAN TANAMAN UNTUK GLULAM
No full textPlantation forests is generally harvested at the age of less than 10 years, thus the log is in small diameter, inferior physicalmechanical properties, and susceptible to bio-deterioration. The application of glued-laminated timber (glulam) could overcome theseissues and increase its utilization. This paper reviews the utilization of wood from plantation forest for glulam. Currently, woodfrom plantations forest studied in glulam research were jabon (Anthocephalus cadamba), rubber-wood (Hevea brasiliensis),mahogany (Swietenia sp.), mangium (Acacia mangium), manii (Maesopsis eminii), mindi (Melia azedarach), pine(Pinus merkusii), sengon (Falcataria moluccana), and sungkai (Peronema canescens). Kempas wood (Koompassiamalaccensis) and merbau (Intsia sp.) from natural forests were used as a layer combination of the glulam. The adhesives usedfor manufacturing glulam were tannin-based adhesives from mangium, mahogany, and merbau, as well as synthetic adhesives,namely isocyanate and phenol resorcinol formaldehyde (PRF). The results shows that glulam bonded with tannin-based adhesivehas physical-mechanical properties comparable with those of solid wood and glulam adhered with PRF adhesive. The physicalmechanical properties of glulam glued with isocyanate were similar with its solid wood. However, the shear strength of glulam waslower than solid wood. There was no delamination occurred in both cold and boiling water delamination tests. Thus, it fulfilledJAS 1152- 2007. The polystyrene impregnation applied in sengon and mindi glulams manufacturing resulted in a few effect ofcolor change, comparable shear strength to its solid wood, and increases its resistance to subterranean termites (Coptotermescurvignathus Holmgren) attack
PENGEMBANGAN TEPUNG PALADO (Aglaia sp.) SEBAGAI PANGAN ALTERNATIF DARI HUTAN
No full textPalado seeds (Aglaia sp.) are originally part of wild forest plants commonly used as a snack by boiling and roasting. Theutilization of these seeds into flour increases its value and extends the storage time as an alternative food ingredient. Therefore, thisstudy aimed to analyse the macronutrient content of palado flour by proximate anlysisi. Parameter analysed includes moisture ash,fat, protein, carbohydrate, and energy contents the palado flour. Analysis of moisture content was determined by drying method; ashcontent was determined by ashing in a furnace; fat content was determined by soxhlet method, protein was determined by the MicroKjeldahl method, carbohydrate content was determined by weight talce, and energy content was determined by the sum of the weightof crude protein, carbohydrates, and fat. The results showed that the palado flour consisted of 66.72% carbohydrate, 12.37% fat,3.61% ash, and 414kcal energy. This research indicates that palado flour could be an alternative flour, both as the main foodmaterial and as a fortification palado seeds, alternative food, nutrition content, flour, bread and noodles
IMPROVEMENT ON SEVERAL PHYSICAL AND MECHANICAL PROPERTIES OF JATI UTAMA NUSANTARA WOOD BY THERMAL COMPRESSION TREATMENT
No full textJati Utama Nusantara (JUN) is one type of growing regime of fast grown teak (Tectona grandis Linn. F) derivedfrom Jati Plus Perhutani (JPP). JUN trees have fewer branches and a more cylindrical-shaped trunk, as well asexhibit rapid growth compared to the teak cultivated from seed (conventional); accordingly, they can beharvested in a shorter time. Despite its fast growth, some studies showed that the wood had not met the SNI01-0608 standard as raw material for furniture. The research aimed to improve several physical and mechanicalproperties of young JUN wood through thermal compression treatment. The test sample for 5-year-old JUNwood was prepared with a size of 2.5 cm (thickness/radial) by 10 cm (width/tangential) by 30 cm(length/longitudinal), then compressed using a 25 kg/cm2-pressure for 40 minutes in three temperaturetreatments of 170°C, 180°C, and 190°C. Testing of wood mechanical and physical properties referred to ASTMD143. The wood crystallinity was observed using an X-Ray Diffractometer (XRD), and the wood surface wasobserved visually. Wood cell structure as supporting data was observed using a stereo-capable microscope(Zeiss). The results revealed that the thermal compression could improve the physical and mechanicalproperties of the densified JUN samples compared to the nonthermally compressed samples. Based on datasimulation, the wood samples' best physical and mechanical properties occurred at approximately 185°C's heatpress
PEMANFAATAN TEKNOLOGI KERTAS NANO KARBON SEBAGAI PEMBUNGKUS WORTEL
No full textIndonesia’s paper consumption, including food wrapping-paper, might steadily increase in the future. This could someday upset the capability of domestic wrapping-paper production due to dwindling potency of conventional fibers (e.g. natural-forest wood). Alternative fibers are abundantly available and it mostly remains unutilized, than it should be introduced in industry, such as bamboo. This study aims to optimize the utilization of alternative fiber sources through the manufacture of wrapping paper from bamboo fiber using carbon nano technology as a foodstuff protector/wrapping. Relevantly, manufacturing trial on papers with nano-technology capability for carrot wrapping was conducted from two bamboo species tali (Gigantochloa apus) and ampel (Bambusa vulgaris) separately. Initially, each species was pulped semi-chemically, and then added with nano-sized activated charcoal particles (20%, w/w). The mixture (bamboo pulp + activated charcoal) was formed into sheets with targeted basic-weight common for wrapping-paper (60 g/m2), and then used for carrot wrapping and the physical strength properties was tested. Result shows that charcoal could can lower carrot-weight loss, which indicates high effectivity in maintaining the carrot freshness and nutritions. Papers made from ampel-bamboo fibers were more prospective for such wrapping than those made from bamboo tali. The use of any experimented papers for carrot wrapping was still better than without wrapping, as they afforded more in securing carrots
KARAKTERISTIK PAPAN SANDWICH DENGAN INTI PAPAN PARTIKEL
No full textBamboo has been recoqnized as wood substitute materials by convertting them into engineered bamboo products. Toincrease bamboo utilization efficiency, the waste generated from bamboo processing can be used further as raw materialsfor particleboard manufacture. Besides to get relatively thick and strong material, the bamboo particleboard can beused as a core layer for sandwich panel. The objective of this research was to determine characteristics of sandwichpanel with particleboard as the core layer. There were four types of particleboard used as the core layer of sandwichpanel i.e bamboo particleboard with density of 0.45 g/cm3(A1) and 0.55 g/cm3(A2), and the mixture of bamboojabon particleboards with density of 0.45 g/cm3(A3) and 0.55 g/cm3(A4). There were three types of outer layerof sandwich panel i.e. bamboo strips (B1), jabon plywood (B2), and mahoni plywood (B3). Sandwich panels wereproduced using urea formaldehyde adhesive. The results showed that bamboo-jabon particleboard used as core layerproduced stronger sandwich panels than those using only bamboo particleboards. Bamboo strips as the outer layerproduced stronger sandwich panels than those of using mahoni and jabon plywood. All sandwich panels produced inthis research conform to both the Indonesian Standard and the Japanese Standard requirements for particleboard withveneer overlay