A preliminary study of a wind turbine design is carried out using a wind tunnel to obtain its aerodynamic characteristics. Utilization of data from the study to develop large-scale wind turbines requires further study. This paper aims to discuss the use of wind turbine data obtained from the wind tunnel measurements to estimate the characteristics of wind turbines that have field size. The torque of two small-scale turbines was measured inside the wind tunnel. The first small-scale turbine has a radius of 0.14 m and the second small turbine has a radius of 0.19 m. Torque measurement results from both turbines were analyzed using Buckingham π theorem to obtain a correlation between torsion and diameter variations. The obtained correlation equation is used to estimate the field measurement of turbine power with a radius of 1.2 m. The resulting correlation equation can be used to estimate the power generated by the turbine by the size of the field well in the operating area of the tip speed ratio of the turbine design.

Biological Hotspot larva ikan diperairan estusri Desa Timbulsoko, Demak dilakukan pada bulan April-Juni 2019 di Desa Timbulsoko. Timbulsloko memiliki perairan yang subur dikarenakan banyak nelayan yang menjadikan lokasi tersebut sebagai daerah fishing ground. Timbulsloko memiliki potensi untuk menjadi daerah nursery ground dan feeding ground untuk ikan dikarenakan adanya habitat mangrove yang alami akan tetapi bencana abrasi mengakibatkan degradasi habitat nursery ground untuk ikan stadia awal. Hasil penelitian menunjukan Larva ikan yang tertangkap di perairan Desa Timbulsloko terdiri dari 13 famili. Komposisi jenis-jenis larva ikan yang tertangkap adalah Mugilidae, Siganidae, Gobiidae, Leiognathidae, Scatophagidae, Chanidae, Latidae, Engraulidae, Gerreidae, Carangidae, Bagridae, Sillaginidae, Ambassidae. Jenis larva ikan yang paling banyak adalah larva ikan Ambassidae yaitu 46,98% sedangkan yang paling sedikit tertangkap adalah larva ikan Carangidae, Sillaginidae yaitu sebesar 1,01%. Kelimpahan larva ikan terbesar adalah 428,271 ind/m³ terdapat pada titik D2P2, sedangkan kelimpahan larva ikan paling sedikit pada titik NP4 dengan nilai kelimpahan adalah 25,974 ind/m³. Kemiripan nilai ekologis habitat pada titik D2P2 dan A2G1 berdasarkan analisis PCA dan kesamaan kontur dari interpolasi kedalaman secara spasial mengindikasikan adanya jejak biological hotspot di perairan mangrove Desa Timbulsloko sebelum terjadinya bencana abrasi.

Biological Hotspot research of fish larvae in estuarine waters of Timbulsoko Village, Demak was conducted in April-June 2019 in Timbulsoko Village. Timbulsloko has fertile waters because many fishermen make this location as a fishing ground area. Timbulsloko has the potential to become a nursery ground area and feeding ground for fish due to natural mangrove habitat but the abrasion disaster resulted in the degradation of the nursery ground habitat for early stage fish. The results showed that fish larvae caught in the waters of Timbulsloko Village consisted of 13 families. The composition of the types of fish larvae caught are Mugilidae, Siganidae, Gobiidae, Leiognathidae, Scatophagidae, Chanidae, Latidae, Engraulidae, Gerreidae, Carangidae, Bagridae, Sillaginidae, Ambassidae. The most common types of fish larvae are Ambassidae fish larvae, which are 46.98%, while the least caught are Carangidae fish larvae, Sillaginidae which is 1.01%. The largest abundance of fish larvae is 428,271 ind / m3 found at D2P2, while the abundance of fish larvae is at least at E1P1270 point with an abundance value of 51,498 ind / m3. The similarity of ecological habitat values at D2P2 and A2G1 points based on PCA analysis and the similarity of contours from spatial depth interpolation indicate the biological hotspot in the mangrove waters of Timbulsloko Village.

The kinetic analysis of octogen coating with a polyurethane base containing hydroxyl-terminated polybutadi-ene (HTPB) was investigated using infrared spectroscopy. The coating process involved a solvent method, where octogen and liquid polyurethane were mixed, the solvent was evaporated, and curing took place at an elevated temperature. The ratio of HTPB to diisocyanate was equimolar. Initially, the curing process occurred in the solvent system, followed by further curing in the bulk system. The kinetic analysis was performed using a modified diffusion-autocatalytic model, which includes non-catalytic, autocatalytic, and diffusion compo-nents. This model was compared with others during the bulk reaction and proved to be effective in correcting errors, particularly in the gel time region. Thermodynamic parameters were evaluated using the Arrhenius and Eyring equations. The reaction rate was initially controlled by chemical reactivity, but after the gel time, diffusion became the controlling factor. In the HTPB-TDI system, both the non-catalytic and autocatalytic parts decreased with increasing temperature, while diffusivity increased. It is worth noting that diffusivity is temperature-dependent. Different diisocyanates, namely toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), and hexamethylene diisocyanate (HMDI), were studied, revealing that HMDI exhibited higher reactivi-ty than TDI and IPDI. The catalyst effect on reaction rate HTPB-TDI system is investigated. Catalysts adding (0.1%) to HTPB-TDI system is really decrease their activation energy by efectivity DBTL>FeAA>TPB. Catalyst not change their diffusivity.

This research article aims to examine the factors that influence behavioral intentions using the traffic accident claim system in Indonesia. This research uses the Theory of Planned Behavior, the Model of Technology Acceptance, and the Integrated Theory of Technology Acceptance and Use, as well as using the Structural Equation Modeling-Partial Least Squares. The questionnaire was distributed to 580 respondents from three institutions – police, hospitals, and state-owned insurance companies – using quota sampling techniques. The results showed that TPB, TAM, and UTAUT had a significant influence in encouraging behavioral intentions using the traffic accident claim system. Further, the study found that 21st-century digital skills have a moderate role in the impact of acceptance models, planned behavior, and technology use on behavioral intent. Although the study was conducted in Indonesia and is limited to three institutions, it provides strategic guidance for policymakers to improve the use of traffic accident claim systems and reduce Road Traffic Accidents. Further research is recommended to explore from different angles and focus on service providers/operators of traffic accident claim systems to refine the findings of this study. This study contributes to the literature by investigating the factors that influence behavioral intentions using traffic accident claim systems and has a high degree of accuracy of answers from the point of view of traffic safety officers.