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Universitas Islam Negeri Sultan Syarif Kasim Riau,Pekanbaru,Indonesia
Full text linkPerbankan syariah merupakan komponen integral dari sistem keuangan nasional yang mendasarkan operasionalnya pada prinsip keadilan, kemaslahatan, dan pengharaman praktik riba, gharar, serta maisir. Keberadaannya tidak hanya memiliki dimensi ekonomi, tetapi juga dimensi moral dan spiritual dalam mewujudkan tata kelola keuangan yang beretika. Kajian ini bertujuan untuk menganalisis kerangka hukum dan regulasi perbankan syariah di Indonesia, dengan fokus pada relasi antara prinsip-prinsip syariah dan kepastian hukum. Penelitian ini menggunakan pendekatan kualitatif deskriptif dengan metode studi kepustakaan (library research), yaitu menelaah peraturan perundang-undangan, fatwa, dan kebijakan yang mengatur perbankan syariah di Indonesia. Temuan penelitian menunjukkan bahwa sistem hukum perbankan syariah di Indonesia telah memiliki fondasi yang solid melalui Undang-Undang Nomor 21 Tahun 2008 tentang Perbankan Syariah, yang diperkuat oleh peran Otoritas Jasa Keuangan (OJK), Bank Indonesia (BI), dan Dewan Syariah Nasional–Majelis Ulama Indonesia (DSN-MUI) dalam melakukan regulasi dan pengawasan. Namun, dalam implementasinya masih ditemukan tantangan, seperti sinkronisasi antara hukum positif dan hukum syariah, tumpang tindih kewenangan antarotoritas, serta keterbatasan literasi hukum syariah di kalangan praktisi. Oleh karena itu, diperlukan penguatan koordinasi antarlembaga, peningkatan kapasitas sumber daya manusia, dan pembaruan regulasi yang adaptif terhadap perkembangan digital. Dengan demikian, kerangka hukum perbankan syariah di Indonesia pada dasarnya telah mencerminkan integrasi antara nilai-nilai syariah dan kepastian hukum nasional
HERITAGE AT THE CROSSROADS OF GEOGRAPHY AND DEVELOPMENT: CASE STUDIES FROM LAHAT REGENCY
Full text linkThis research investigates the intersection between geography, urban development, and heritage preservation in Lahat Regency, South Sumatra, Indonesia, using Lubuk Sepang and Bangke villages as case studies. Lubuk Sepang's river proximity and Bangke's mountainous terrain distinctly influence settlement patterns, heritage conservation challenges, and developmental pressures. Employing a mixed-methods approach—including fieldwork, geospatial mapping—the study identifies how geographical features impact heritage sites, community dynamics, and conservation strategies amid rapid urbanization.The findings highlight that settlements near rivers face threats from infrastructure expansion, erosion, and environmental degradation, risking loss of cultural heritage linked closely to water resources. In contrast, mountainous settlements struggle with deforestation, landslides, and infrastructural encroachment, threatening ecological integrity and traditional heritage. Effective heritage conservation necessitates integrating geographical considerations into urban planning, adopting technological innovations such as GIS (Geographic Information System) and digital archiving, and fostering active community participation. The study provides actionable recommendations to harmonize urban growth and heritage preservation in geographically diverse areas
HAMBATAN DAN TANTANGAN PENERAPAN GREEN PROCUREMENT PADA PROSES PEMILIHAN PENYEDIA PADA PROYEK KONSTRUKSI
Full text linkMeskipun sudah diperkenalkan secara luas, penerapan green procurement sampai saat ini belumlah berjalan sesuai harapan. Oleh karena itu, penelitian ini bertujuan untuk menganalisa faktor penghambat dominan yang mempengaruhi penerapan green procurement di kabupaten Solok Selatan serta merumuskan strategi untuk menghadapi tantangan penereapan green procurement. Faktor penghambat diidentifikasi dari kajian literatur yang disesuaikan dengan kondisi di daerah. Metoda pengumpulan data dilakukan dengan wawancaa dan kuisioner. Data diolah dengan metoda RII untuk memperoleh bobot dan faktor penghambat dominan dari penerapan green procurement. Analisa SWOT digunakan untuk merumuskan strategi. Hasil identifikasi dan wawancara menghasilkan 27 faktor valid yang di kelompokan dalam PESTLE (politik, ekonomi, sosial, teknologi, legal dan lingkungan). Hasil analisa RII menunjukan bahwa faktor sumber daya manusia dan faktor peraturan, kebijakan, pedoman dan standar merupakan faktor penghambat dominan dalam penerapan green procurment di kabupaten Solok Selatan. Penelitian ini selanjutnya merekomendasikan 4 strategi untuk menghadapai tantangan penerapan green procurement berdasarkan hasil analisis SWOT
Characterization of Poly Lactic Acid (PLA) Based on PEG-200 Modification of Clay-CaCO3 as Subtitution to LDPE Coating Paper
Full text linkPlastics play a central role in daily life due to their lightweight nature, mechanical strength, low cost, and durability. Nevertheless, their environmental impact is significant, as they contribute to pollution and global warming. Polylactic Acid (PLA) has gained attention as a biodegradable alternative to conventional LDPE plastics. Although environmentally friendly, PLA exhibits inherent limitations such as brittleness and insufficient toughness, which restrict its broader application. To overcome these drawbacks, plasticizers like Polyethylene Glycol (PEG) 200 and reinforcing agents such as clay and calcium carbonate (CaCO₃) are added to enhance its mechanical performance. This research aims to investigate how these additives affect the resulting film properties. The bioplastic film was produced using a solvent casting method with chloroform as the solvent. The mixture was stirred at ambient temperature for six hours, then cast in a single step into a closed mold and allowed to rest overnight to form a film. The resulting film had a white appearance, slight transparency, and a smooth, slippery surface. Compared to films produced using a layered pouring approach, those formed via the one-pour technique exhibited superior thickness and mechanical strength. To characterize the effects of the additives, several analytical methods were employed: X-Ray Diffraction (XRD) to analyze crystallinity, Thermogravimetric Analysis (TGA) to assess thermal stability, Fourier Transform Infrared Spectroscopy (FTIR) to identify functional groups and chemical bonds, and Dynamic Mechanical Analysis (DMA) to determine mechanical properties such as tensile strength, Young’s modulus, and elongation at break. Surface morphology was further examined using Scanning Electron Microscopy (SEM). The most favorable results were observed in the composition containing 80% PLA, 10% PEG, 5% CaCO₃, and 5% clay. This formulation yielded a crystallinity of 96.71%, a decomposition temperature of 366.22 °C, elongation at break of 12.98%, Young’s modulus of 56.77 MPa, and a tensile strength of 1.25 MPa. These findings suggest that the film has strong potential as a coating material to replace LDPE
Membrane Area Sensitivity Analysis to Achieve Higher CO2 Outlet Concentration
Full text linkSeparation using membrane technology offers several benefits such as low energy requirement, simple flow process, and no phase change. Moreover, its process only requires sufficient area suitable for remote and offshore facilities. This research will focus on how to improve CO2 concentration in the membrane-2 output or permeate-2. It will discuss techno-economic and modify 2-stage membrane technology to achieve higher carbon dioxide concentration by evaluating several membranes using ASPEN HYSYS. From the simulation results, it was found that reduced membrane area had the effect of increasing the carbon dioxide concentration in permeate-2 but decreasing the gas flow rate. Lowering the membrane area can increase the concentration of CO2 at permeate-2 from 82.47 to 84.7 - 96 % mol of CO2. Based on the evaluation of several membrane areas, a membrane area of 2.5 m2 was chosen because it can produce 91.78% mol CO2 in permeate-2. From the economic analysis, total annual cost could reduce up to USD 1,426,296
COMPARISON OF CHILDHOOD AND CURRENT RESIDENTIAL LOCATION SATISFACTION AFTER RELOCATION OR STAYING
Full text linkThis study is based on the premise that residential satisfaction in adulthood may be influenced by satisfaction with childhood residential locations. Residential location is not only a physical setting but also part of the interactive process that shapes an individual's relationship with their environment through sensory experience, memory, and perception. Data were collected through open-ended questionnaires distributed to adult respondents from various demographic and geographic backgrounds. The responses were qualitatively analyzed using open coding, axial coding, and selective coding methods. The results revealed a significant correlation between satisfaction with childhood residential locations and satisfaction with current residences after relocation or staying, including housing location choices. These findings provide valuable insights for urban planners in designing residential environments that accommodate the diverse preferences of the community. Furthermore, this study emphasizes the importance of considering childhood experiences in understanding future housing location needs
Behaviour of RC Beam-Slab Member with Embedded Polystyrene Spheres
Full text linkIn this study, four reinforced concrete specimens were produced. Each specimen consisted of two beams and one slab. Polystyrene spheres were used to replace concrete in the beams and slabs in various combinations to reduce weight. The specimens were subjected to an incremental static load under the four-point load setup. The effects of polystyrene spheres on the structural performance of these specimens were investigated. The specimen with solid beams and lightweight slab (i.e., embedded with polystyrene spheres) had the highest material efficiency. Its efficiency was 5% higher than that of the entirely solid specimen. The material's effectiveness decreased by 2% to 4% when the beams were filled with polystyrene spheres. This was regardless of whether the slab contained polystyrene spheres. From feasibility analysis, none of the specimens fulfilled all five assessment criteria. Ductility was a concern for the specimens. The current specimen designs were unable to outstrength the solid specimen. The size and shape of the polystyrene, as well as the dimension of the specimen, may be modified to improve its efficiency
A Bibliometric Overview of Current States and Research Trends in Concrete-Filled Tube Columns
Full text linkConcrete-filled tube (CFT) columns have gained prominence in structural engineering for their exceptional load-bearing capacity and efficiency. This study conducts a bibliometric analysis of 1,154 publications from 2014 to August 2024, using data from the Scopus database and VOSviewer, to map research trends and key developments in CFT studies. Citation, co-citation, and co-authorship analyses identify influential publications, journals, authors, countries, and institutions. Findings highlight significant growth in research output and increasing focus on advanced modelling techniques, including machine learning. Emerging themes include integrating alternative materials such as Fiber-Reinforced Polymer (FRP), stainless steel, High-Performance Concrete (HPC), Recycled Aggregate Concrete (RAC), and Seawater Sea Sand Concrete (SWSSC), showcasing the potential of multi-material innovations. This analysis offers insights into current research directions and identifies gaps, suggesting that future work explore novel material combinations and advanced modelling approaches to enhance performance and drive innovation in CFT column studies
The Effect of Manhole Form on Double Bottom Ship Construction
Full text linkThe ship's hull construction must withstand all loads, be made as light as possible and comply with regulations. The purpose of this study was to determine the maximum strength limit of double bottom ship construction with manhole form variations. Research design for this study; literature studies, field studies, and simulations using ANSYS. The results of the existing double model structure strength values for the maximum stress values in the sagging hogging state are 236.60 MPa and 154.18 MPa. Von Mises stress values are 227.94 MPa and 136.26 MPa. The shear stress values are 131.5 MPa and 77.36 MPa. The maximum deformation is 0.0049 m, and the safety factor is 1.346. The total construction weight is 201.83 metric tons. The best results of the analysis of variation were found in Model B1, which changed the hole ratio from 0.75 to 0.6 and increased the hole dimension by 200 mm. The maximum stress values of Model B1 in the sagging-hogging condition are 186.93 MPa and 141.54 MPa. Von Mises stress values are 238.72 MPa and 184.82 MPa. The shear stress values are 113.37 MPa and 137.42 MPa. The safety factor is 1.337 m, and the maximum deformation is 0.0034
Terwilliger Algebras of Group Association Schemes of Matrix Groups
Full text linkThis paper investigates the Terwilliger algebras of some group association schemes related to matrix groups. We obtain the structure of the Terwilliger algebras for the general and the special linear group of 2 × 2 matrices over the field of order 5. In particular, we determine the Wedderburn decomposition of these algebras