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Harga emas dunia merupakan faktor eksternal yang berpotensi memengaruhi kinerja keuangan perusahaan pertambangan emas, namun hubungan keduanya tidak selalu bersifat linear mengingat kompleksitas struktur bisnis dan biaya perusahaan. Penelitian ini bertujuan menganalisis secara komparatif tren harga emas dunia dengan profitabilitas PT Aneka Tambang Tbk periode 2021–2025 menggunakan metode deskriptif kuantitatif dengan pendekatan komparatif tren. Data bersumber dari laporan keuangan konsolidasian audited PT Aneka Tambang Tbk tahun 2021–2025 serta data harga emas rata-rata tahunan yang diterbitkan oleh World Gold Council, dengan indikator profitabilitas Return on Assets (ROA) dan Net Profit Margin (NPM). Hasil penelitian menunjukkan bahwa harga emas mengalami kenaikan akseleratif dari USD 1.793,38 menjadi USD 3.518,43 per troy ounce dengan pertumbuhan kumulatif 96,2%, sementara profitabilitas perusahaan bergerak fluktuatif dengan puncak tertinggi pada 2025. Analisis komparatif terhadap empat fase pergerakan menunjukkan hubungan yang tidak konsisten dan non-linear, di mana dua fase bergerak searah, satu fase berlawanan, dan satu fase bersifat parsial, yang disebabkan oleh fluktuasi volume penjualan, ekspansi aset yang belum produktif, dan lonjakan beban pokok pembelian logam mulia dari pihak ketiga. Penelitian ini mengimplikasikan bahwa analisis profitabilitas perusahaan pertambangan perlu mempertimbangkan struktur biaya, strategi pengadaan, dan keputusan investasi secara simultan, tidak cukup bertumpu pada pergerakan harga komoditas semata.

Simpang empat tak bersinyal memiliki peran penting dalam mengatur pergerakan lalu lintas, namun sering menimbulkan permasalahan ketika volume kendaraan tinggi. Penelitian ini bertujuan untuk menganalisis kinerja simpang empat tak bersinyal di Simpang Jalan DR. Sutomo, Jalan Lintas Utama Sumatera, dan Jalan Letkol Rusman Effendy Bustan, Kota Baturaja, dengan menggunakan metode Pedoman Kapasitas Jalan Indonesia (PKJI) 2023. Pengumpulan data dilakukan melalui survei selama tiga hari dengan pengamatan pada jam puncak pagi pukul 07.00-09.00 Wib, siang pukul 12.00-14.00 Wib, dan sore pukul 16.00-18.00 Wib. Hasil penelitian menunjukkan bahwa volume lalu lintas tertinggi terjadi pada hari Senin pukul 08.30–08.45 WIB dengan Qtot = 2.932 SMP/jam dan kapasitas simpang C = 3.446 SMP/jam. Perhitungan kinerja simpang menghasilkan derajat kejenuhan (DJ) = 0,85, tundaan rata-rata = 14,57 detik/SMP, dan peluang antrean berkisar 29%–57%. Berdasarkan kriteria PKJI 2023, simpang ini termasuk dalam Tingkat Pelayanan E Situasi ini menunjukkan bahwa kinerja simpang berada pada kondisi kritis dan tidak stabil.  

Pierhead casting is a critical activity in toll road infrastructure projects that requires continuous concrete supply to maintain quality and execution time. Factors influencing the smooth casting process include the regularity of truck mixer arrival intervals and the work cycle of the truck concrete pump. This study aims to analyze the effect of truck mixer intervals and truck concrete pump performance on the productivity of pierhead casting at Pierhead P37S on the Solo–Yogyakarta–NYIA Toll Road Project, Section 2 Package 2.1A. The analysis method used field observation through time study techniques to measure the cycle duration of truck mixers and the operating time of the truck concrete pump. The analysis stages included calculating cycle time, productivity, production capacity, and working duration of each equipment. The results show that the truck concrete pump achieved a productivity of 0.425 m³/minute, while the truck mixer reached 0.989 m³/minute. These values were influenced by cycle time, equipment condition, work area condition, execution method, and work volume. Based on duration analysis, the truck concrete pump required about 4.7 hours to complete the casting of 120 m³ of ready-mix concrete, while the truck mixer required 2.022 hours to support the concrete supply process.

The advancement of digital technology has encouraged the transformation of airport services, including the implementation of Customer Service through Contact Center 172. This study aims to analyze the implementation of Contact Center 172 in improving service responsiveness at Adi Soemarmo International Airport, Boyolali. The study employed a descriptive qualitative approach with a case study method. Data were collected through observation, interviews with five informants, and documentation, and analyzed using the Miles and Huberman interactive analysis model consisting of data collection, data reduction, data display, and conclusion drawing. The findings indicate that the implementation of Contact Center 172 has supported digital service transformation through an integrated communication system that facilitates real-time information delivery and complaint handling. The service has improved Customer Service responsiveness by providing easier access to information, faster response times, and more effective coordination among service units. Supporting factors include competent human resources, integrated systems, and adequate digital facilities, while the main obstacles involve limited internet connectivity, system maintenance disruptions, high complaint volumes, and limited user understanding of digital services. Therefore, strengthening technological infrastructure, improving staff competencies, and increasing public awareness are essential to optimize digital-based airport services.

Open burning of household waste remains the dominant waste disposal practice in rural areas of Indonesia, posing significant risks to public health and environmental quality. This community service activity aimed to provide an innovative, low-smoke waste combustion solution — the rocket stove incinerator — to the residents of Dusun Allukeke, Desa Belapunranga, Kecamatan Parangloe, Kabupaten Gowa. A baseline survey conducted during PBL 1 revealed that 87.6% of households disposed of waste through open burning. An asset-based community development (ABCD) approach was adopted, engaging community members at every stage from planning, construction, to utilisation. The rocket stove was constructed over three days using locally available materials and was demonstrated to significantly reduce visible smoke emissions compared to conventional open burning. The technology works through a vertically insulated combustion chamber that promotes near-complete combustion, reducing waste volume by 50–90% while suppressing particulate matter and hydrocarbon emissions. Community participation strengthened local ownership of the solution. This activity demonstrates that appropriate technology co-constructed with communities can serve as a practical, sustainable, and replicable model for rural waste management.

This study applies a quantitative approach with a survey method as a data collection technique. Research data were obtained by distributing questionnaires to respondents who were the subjects of the study, namely small and medium enterprises (SMEs) engaged in shell craft in the coastal areas of Surabaya. The influence of digitalization and competitiveness on increasing income from digitalization was measured through the use of social media, e-commerce platforms, and the use of information technology in business activities. Meanwhile, the competitiveness variable was measured based on product quality, innovation, price, and marketing capabilities. Digitalization has a positive effect on increasing income for small and medium enterprises (SMEs) engaged in shell craft. The use of digital media has been proven to be able to expand the market and increase sales volume. In addition, competitiveness also affects income, where innovation is the main factor that drives increased sales value. Simultaneously, digitalization and competitiveness contribute significantly to increasing income for small and medium enterprises (SMEs). Support for related institutions and business actors in digital literacy, product innovation, and sustainable marketing strategies is needed to strengthen competitiveness and improve the welfare of coastal communities.

 The development of information technology encourages government agencies to implement digital systems in administrative management, including the filing of financial documents. This study aims to analyze the application of digitization of financial document archives in the General and Administration Section of the South Sumatra National Road Implementation Center, find out the benefits obtained, and identify obstacles faced in its implementation. The research uses a descriptive method with a qualitative approach. Data was obtained through direct observation during internship activities, documentation, internship logbooks, and literature studies. The results of the study show that the digitization of financial document archives is carried out through the stages of document completeness, scanning, digital storage, archive grouping, and document retrieval. The implementation of archive digitization provides benefits in the form of easier document searching, reducing the risk of losing archives, increasing work effectiveness and efficiency, saving storage space, improving data security, and supporting the digital transformation of government agencies. However, there are still several obstacles such as the large volume of documents, the need for high precision in the scanning process, file naming errors, device and system interference, the risk of digital data loss, limited human resources, and the simultaneous management of physical and digital archives. Therefore, it is necessary to improve the quality of digital archive management so that the benefits obtained can be more optimal.

Nanas merupakan unggulan kedua yang di ekspor Indonesia setelah buah manggis pada 22 tahun lalu, volume ekspor nanas pada tahun 2004 sebesar 2.431.263 kilogram atau mengalami peningkatan sebesar 6,4 % dari tahun -tahun sebelumnya, permintaan ekspor nanas yang cukup tinggi merupakan pendorong bagi produksi nanas dalam negeri yang mampu bersaing dengan nanas negara lain. Seperti halnya produk pertanian lainnya, karakteristik buah nanas adalah mudah rusak dan pemanfaatannya lebih banyak sebagai makanan penutup mulut karena rasanya yang segar. Potensi penganeka ragaman produk pangan dengan bahan baku sebenarnya cukup banyak namun sampai dengan saat ini masih belum berkembang. Oleh sebab itu pada penelitian ini dilakukan memanfaatkan ektrak buah nanas melalui fermentasi bakteri Acetobacter Xylinum untuk membentuk polisakarida akstraseluler (nata) sebagai hidangan non energi yang biasa kita kenal Nata de pina, penelitian ini bertujuan untuk memanfaatkan ekstrak buah nanas untuk dijadikan hidangan Nata de pina. Hasil pengujian menunjukkan bahwa nata de pina memiliki nilai pH sebesar 4,7 dan kadar air sebesar 98,08% sudah memenuhi syarat mutu berdasar SNI nata. Hasil uji organoleptik terhadap 30 panelis menunjukkan bahwa sebagian besar panelis menyukai rasa, warna, aroma, dan tekstur Nata de pina yang dihasilkan.

This study aims to analyze the influence of fundamental and technical factors on stock price movements in the Indonesian capital market. The method used is a literature review with a qualitative descriptive approach, utilizing secondary data obtained from various scientific literature sources as well as stock price data from the Investing platform. The results indicate that there are significant variations in stock prices among companies, reflecting differences in fundamental performance such as profitability, capital structure, and company prospects. In addition, from a technical perspective, stock price movements exhibit dynamic fluctuations, including both increases and decreases, influenced by market sentiment and investor responses to available information. The varying levels of stock volatility also indicate differences in investment risk. Trading volume plays an important role as a key indicator in technical analysis, where high volume reflects strong liquidity and investor interest, while low volume indicates limited market activity. Overall, the findings suggest that fundamental and technical factors have a complementary influence in determining stock price movements. Therefore, investors are advised to integrate both approaches in making investment decisions in order to achieve optimal returns while minimizing risk. This study is expected to contribute to the development of capital market research and serve as a reference for investors and academics.

The stock market is a place to buy shares for profit. In Indonesia, energy stocks are highly unpredictable because global commodity prices change constantly. This study examines what affected energy stock returns in 2024, focusing on trading volume, price swings, company profits, and cash flow. Using financial reports and statistical analysis, all these factors were tested together and individually. The results show that combined, all these factors do affect stock returns. However, when looked at one by one, only the company's net profit truly matters to investors. On the other hand, busy trading, daily price swings, and cash flow have no impact at all. In fact, all the factors studied only account for 14% of stock return movements, while the remaining 86% is driven by other outside forces. In conclusion, for those looking to invest in energy stocks, the most important thing to watch is the company's ability to generate net profit, rather than just looking at how busy daily transactions are in the market.

This study aims to analyze the implementation of digital marketing in Sharia cooperative retail business units to increase sales volume. Advances in information technology have driven changes in consumer behavior, leading to an increasing reliance on digital media for product information and transactions. This situation requires Sharia cooperatives to adapt through the implementation of effective digital marketing strategies. This study employed a qualitative method with a case study approach. Data were obtained through observation, in-depth interviews, and documentation. The research informants consisted of cooperative administrators, retail business unit managers, and consumers who interacted with the cooperative's digital marketing media. Data analysis techniques used the Miles and Huberman model, which includes data reduction, data presentation, and conclusion drawing. The results show that the implementation of digital marketing through social media, WhatsApp Business, and digital promotions can expand market reach, enhance interaction with consumers, and drive increased sales volume. However, obstacles remain, including limited human resources and consistency in digital content management. Therefore, improving the digital competency of cooperative managers is necessary to optimize digital marketing strategies.

Ketidaksesuaian kualitas pada proses assembly sepatu kulit kerap memicu siklus rework berulang yang menguras sumber daya waktu maupun biaya produksi secara signifikan. Penelitian ini mengkaji mekanisme pengendalian cacat yang diterapkan pada Product D-01 di Lini C PT XYZ, dengan menggunakan DMAIC sebagai kerangka perbaikan utama serta Pareto, P-Chart, Fishbone Diagram, 5 Whys, Failure Mode and Effects Analysis (FMEA), dan Cost of Quality (COQ) sebagai alat pendukung. Data primer bersumber dari catatan produksi internal perusahaan, pengamatan lapangan, dan wawancara terstruktur bersama pengawas produksi dan staf quality control. Pengukuran baseline menunjukkan bahwa Lini C menyumbang volume cacat paling tinggi di antara seluruh lini yang ada, dengan Product D-01 mencatat 10.487 pair cacat dari total output 80.387 pair, sehingga menghasilkan defect rate sebesar 13,05%. Distribusi Pareto mengidentifikasi wrinkle, incorrect colour, dan not straight sebagai tiga kategori cacat paling kritis. Penilaian FMEA menetapkan Risk Priority Number tertinggi sebesar 245 pada perilaku operator yang terburu-buru selama proses lasting dan brushing. Tindakan korektif mencakup pemasangan SOP visual, implementasi checklist QC pra-shift, verifikasi kondisi mesin secara rutin, dan penyediaan sampel referensi warna serta bentuk yang terstandar. Pemantauan selama dua periode berikutnya mengkonfirmasi penurunan defect rate secara bertahap menjadi 12,80% dan kemudian 11,65%, disertai penurunan estimasi biaya kegagalan internal dari Rp 2,36 juta menjadi Rp 1,86 juta per periode.

The road project serving as access to Lambo Dam in Rendubutowe Village, South Aesesa District, Nagekeo Regency, East Nusa Tenggara, uses various types of heavy equipment. The analysis method was carried out by recalculating productivity based on field data and references. Productivity calculations were related to the work volume in order to obtain daily productivity and the required duration. Therefore, theoretical calculation knowledge derived from previous studies was needed. Heavy equipment productivity was then analyzed to determine time efficiency. The subgrade work and pavement layer work on the road project to Lambo Dam, located in Rendubutowe Village, South Aesesa District, Nagekeo Regency, East Nusa Tenggara, had a road length of 6.3 km and a road width of 6 m. However, the observation was limited to a 1 km section from Station (Sta) 0+500 to Sta 1+500. The results obtained were productivity and duration for excavation work using an excavator and dump truck, each at 1785.6 m³/day in 4.52 days. Embankment work using an excavator and dump truck each had a productivity of 892.8 m³/day for 3.82 days, a bulldozer of 43,200 m³/day in 0.07 days, and a Vibro Roller of 168 m³/day in 20.27 days. Base course work used an excavator and dump truck with a productivity of 892.8 m³/day in 2.02 days, a motor grader of 23,372.8 m2/day, and a Vibro Roller of 168 m³/day for 10.71 days. Surface course work used a concrete Mixer truck with a productivity of 43.4 m³/day for 36.72 days. Heavy equipment productivity is influenced by the number of units used; the insufficient use of excavators causes dump truck productivity to be less than optimal in transporting excavation and embankment materials. Likewise, Vibro Rollers are needed in more than one unit so that the project can be completed faster

The optimization of road alignment has become increasingly important due to the continuous growth in traffic volume and the rising demand for efficient travel time. Road optimization considers several key factors, including traffic volume, population growth, and regional development, to ensure that transportation infrastructure remains functional and capable of meeting future mobility demands. The Malang–Batu corridor is characterized by mountainous terrain and hilly topography, requiring an appropriate geometric road design to determine the shortest feasible route while maintaining compliance with the Indonesian Bina Marga geometric design standards. This study developed a geometric road alignment model by applying Bina Marga specifications, in which the first horizontal curve was designed using the Spiral–Circle–Spiral (SCS) configuration, the second curve employed the Spiral–Spiral (SS) configuration, and the third curve utilized the Spiral–Circle–Spiral (SCS) configuration. The primary objective of this study was to determine the minimum achievable route length through variations in horizontal alignment parameters. The modeling results indicate that the shortest route length obtained was 1,101.17 m. The optimal horizontal alignment consisted of an SCS curve at Point A, an SS curve at Point B, and an SCS curve at Point C, whereas the vertical alignment followed the existing terrain conditions, incorporating both crest and sag vertical curves. These findings demonstrate that optimizing horizontal alignment parameters can effectively minimize route length while satisfying the geometric design requirements established by the Bina Marga standards.

Plastic waste, particularly plastic bottles, has become one of the major challenges in urban environmental management due to its increasing volume and potential to pollute ecosystems. In Bogor City, plastic waste constitutes a significant proportion of daily municipal solid waste, highlighting the need for effective and sustainable waste management models. This study aims to analyze the role of the Reduce, Reuse, Recycle Waste Processing Facility (TPS3R) in managing plastic bottle waste in Bogor City, with a case study of the Eco Techno Park at Ibn Khaldun University (UIKA) Bogor. The research employed a descriptive qualitative method using a case study approach. Data were collected through field observations, in-depth interviews with facility managers, and reviews of relevant documents and literature. The findings indicate that the TPS3R Eco Techno Park has successfully implemented the 3R principles through an integrated system supported by environmentally friendly technologies and a circular economy framework. Plastic bottle waste is managed through sorting, shredding, and recycling processes to produce value-added products, including plastic pellets, handicrafts, and construction materials. In addition, organic waste management is integrated through the cultivation of Black Soldier Fly (BSF) larvae. The facility has contributed to reducing the volume of waste sent to landfills by approximately 18%. The study implies that strengthening regulatory support, enhancing community participation, and developing circular economy-based business models are essential to ensure the long-term sustainability of waste management programs and support Bogor City's waste reduction targets.

Road improvement projects require consistency between technical planning documents and field implementation to ensure that service quality, structural performance, construction time, and user safety are achieved. This article evaluates the conformity between planning and realization in the Pangkalan-Batas Jambi road improvement project in Rawas Ulu District, North Musi Rawas Regency. The study used a descriptive-quantitative evaluative approach based on field monitoring, project technical documents, comparative quantity analysis between contract and Contract Change Order (CCO), and identification of implementation constraints. The results showed that several work items changed during construction because initial planning data did not fully capture actual field conditions. Quantities increased for drainage excavation (+18.87%), roadbed preparation (+8.99%), aggregate class A base course (+12.51%), and AC-Base (+11.98%). Conversely, reinforced pipe culverts decreased (-58.33%), unsealed aggregate base/sirtu decreased (-43.50%), and tack/prime coat volume slightly decreased (-0.47%). The time schedule showed a minor delay of -0.13% in the first week but recovered in the second week, indicating effective field coordination. Main constraints included traffic interference, limited worker visibility, and equipment visibility. The study recommends more detailed site surveys during planning, stronger traffic management, stricter occupational safety implementation, systematic progress control, and routine post-construction maintenance to maintain road service life.

Land-use changes dominated by impervious surfaces in residential areas reduce the natural infiltration capacity of the soil and increase surface runoff, which may lead to flooding and waterlogging. This study aimed to design a rainwater infiltration well system as an effort to reduce surface runoff in Samudera Afroza 3 Housing Estate, Jambi City. A quantitative approach was employed through field surveys, hydrological analysis, soil permeability testing, GIS-based land-use analysis, and infiltration well design in accordance with SNI 8456:2017 and SNI 03-2453-2002 standards. Rainfall analysis was conducted using maximum daily rainfall data from 2014–2023, applying several probability distributions, with the Gumbel distribution identified as the most representative model. The results revealed that the residential area covers 8,104 m², with 91.84% of the land occupied by built-up surfaces, resulting in limited natural infiltration capacity. The average soil permeability value of 0.00024 m/s indicates favorable conditions for the implementation of infiltration wells. Based on the design calculations, 41 Type III infiltration wells are required, providing a total storage capacity of 289.665 m³ and an infiltration discharge of 0.0919 m³/s. The proposed infiltration well system is capable of reducing runoff volumes by 15.044%, 12.486%, and 11.223% for 2-year, 5-year, and 10-year return periods, respectively. Therefore, infiltration wells can be considered an effective alternative for water conservation and runoff management in residential areas.

The opening of the wrench opening for M14 bolts is broken in use as a problem encountered in field activities. The manufacturing objective is to obtain an M14 mm wrench-ring wrench from forged steel measuring 200x6.5 mm. The manufacturing method includes: wrench design on one end and ring wrench design on the other end for bolt size M14 mm, cutting sufficient volume of steel material after forging according to the design, wrench forging on one end and ring wrench forging on the other end for bolt size M14, Chromium plating; finishing of wrench gap and hexagon for ring wrench with a distance of 22 mm, and quality-dimension-standard inspection. TThe manufacturing results are in the form of a paired wrench with an M14 mm ring wrench made of forged steel coated with chromium measuring 200x6.5 mm with a total production cost of IDR 30,000/unit, and a process duration of 3 minutes/unit which has the impact that the paired wrench with a ring wrench for M14 mm bolts measuring 200x6.5 mm can be used for M14 bolts in general with an opening width of 22 mm for both ends as a wrench or ring wrench.

The development and performance of high-strength, environmentally friendly, and renewable nunang fiber (Cordia dichotoma)-reinforced polyester composites continue to be refined to achieve optimal performance. This study characterizes the key properties of nunang fiber-reinforced polyester composites with carbon powder fillers. The polyester composites were fabricated using a hot-press method with a nunang fiber volume fraction of 20% (by weight) and varying carbon powder content from 0–10% (by weight). The results of the investigation show that the tensile and bending strengths of the composites increase with increasing carbon powder content up to 2.5%. However, adding carbon powder filler up to 10% to the polyester–nunang fiber composites reduces their tensile and bending strengths. A different trend is observed for the impact toughness of the composites, which increases up to a carbon powder content of 5% and decreases when the carbon powder content reaches 10%. This phenomenon is attributed to the ability to form an optimal fiber-matrix interface between the nunang fibers and the polyester–carbon powder matrix. SEM morphological observations confirmed fiber pull-out failure and matrix failure due to the high stiffness caused by the presence of the carbon powder filler.

Diesel engines are widely used in the transportation and industrial sectors due to their high thermal efficiency and good operational durability. However, increased fuel consumption due to inefficiency of the injection system remains a common problem. Injector characteristics, particularly nozzle diameter and injection pressure, are important factors that affect the quality of fuel atomization, air-fuel mixing, and combustion efficiency. An inappropriate combination of parameters can cause suboptimal combustion and increase fuel consumption. This study aims to analyze the effect of variations in nozzle diameter and injection pressure on fuel consumption efficiency in diesel engines. The method used is an experiment with variations in nozzle diameter of 0.150 mm, 0.152 mm, and 0.154 mm and injection pressures of 400 bar, 420 bar, and 440 bar. Tests were conducted at engine speeds of 500 rpm, 1000 rpm, and 1500 rpm with a fuel consumption measurement time of one minute for each parameter combination. Fuel consumption was measured using the volumetric method and analyzed through the fuel volumetric flow rate, fuel mass flow rate, Brake Power (BP), and Brake Specific Fuel Consumption (BSFC). The results showed that the combination of a nozzle diameter of 0.150 mm and an injection pressure of 400 bar produced the lowest BSFC value, thus providing the best fuel consumption efficiency. Meanwhile, the combination of a nozzle diameter of 0.152 mm and an injection pressure of 420 bar showed the closest condition to optimal because it was able to provide a balance between atomization quality and the amount of fuel injected, resulting in efficient and stable combustion. Thus, the efficiency of a diesel engine is influenced by the balance of nozzle size and injection pressure, not solely by the lowest fuel consumption.