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Beras merupakan makanan pokok mayoritas penduduk Indonesia. Beras diolah dari padi melalui beberapa tahapan proses mulai dari panen, perontokan, pembersihan, pengeringan, pengupasan kulit gabah, pemolesan dan pengemasan. Pengolahan padi menjadi beras dengan cara mekanis untuk meningkat produksi dan menekan kehilangan hasil. Husker merupakan salah mesin yang digunakan dalam proses pengupasan kulit gabah. Penelitian ini bertujuan untuk mengevaluassi kinerja mesin pengupas gabah double pass kapasitas 1000-1200 kg per jam di Desa Sonorejo Kecamatan Padangan Kabupaten Bojonegoro. Husker telah dioperasikan selama 5 tahun, apakah kinerja dari mesin masih sesuai standar SNI atau sudah menurun sesuai umur ekonomisnya. Parameter pengamatan penelitian ini meliputi : bobot gabah, lama pengumpanan, bobot dan waktu pengupasan, kualitas beras pecah kulit dan konsumsi bahan bakar. Data yang diperoleh dianalisis untuk mendapatkan nilai kapasitas pengumpanan, kapasitas pengupasan, efisiensi, laju konsumsi bahan bakar dan kualitas gabah pecah kulit hasil pengupasan, selannjutnya dianalisis secara diskriptif. Hasil evaluasi kinerja diperoleh nilai kapasitas pengumpanan 996,4 ±1,5 kg/jam, kapasitas pengupasan 768 ± 20,1 kg/jam, efisiensi 76,1±1,5 %, rendemen 83,3±0,65 dan laju konsumsi bahan bakar 2,07±0,05 l/jam. Persentase beras pecah kulit utuh 74,7±1,26, memenuhi syarat SNI minimal 70%. Hasil evaluasi husker yang diuji masih layak untuk dioperasikan., Rice is the staple food of the majority of the Indonesian population. Rice is processed from paddy rice through several stages, starting from harvesting, threshing, cleaning, drying, stripping the rice husk, polishing, and packaging. Processing rice mechanically increases production and reduces yield losses. Husker is one of the machines used to remove the chaff (the outer husks) of grains of rice. This study aims to evaluate the performance of a double pass rice husker machine with 1000-1200 kg per hour in Sonorejo Village, Padangan District, Bojonegoro Regency. Husker has been operated for five years, whether the engine's performance is still according to SNI standards or has decreased according to its economic life. Parameters observed in this study include grain weight, feeding time, weight and time of stripping, quality of brown rice, and fuel consumption. The data obtained were analyzed to obtain the value of feeding capacity, stripping capacity, efficiency, rate of fuel consumption, and the quality of the brown rice, then analyzed descriptively. The results of the performance evaluation showed the value of feeding capacity 996.4 ±1.5 kg/hour, stripping capacity 768 ± 20.1 kg/hour, efficiency 76.1±1.5 %, yield 83.3±0.65 and fuel consumption rate 2.07±0.05 l/hour. The percentage of brown rice is 74.7±1.26, correspondingly with the SNI requirements of at least 70%. The evaluation results of the observed huskers showed that the husker is still feasible to operate.

Beras merupakan makanan pokok mayoritas penduduk Indonesia. Beras diolah dari padi melalui beberapa tahapan proses mulai dari panen, perontokan, pembersihan, pengeringan, pengupasan kulit gabah, pemolesan dan pengemasan. Pengolahan padi menjadi beras dengan cara mekanis untuk meningkat produksi dan menekan kehilangan hasil. Husker merupakan salah mesin yang digunakan dalam proses pengupasan kulit gabah. Penelitian ini bertujuan untuk mengevaluassi kinerja mesin pengupas gabah double pass kapasitas 1000-1200 kg per jam di Desa Sonorejo Kecamatan Padangan Kabupaten Bojonegoro. Husker telah dioperasikan selama 5 tahun, apakah kinerja dari mesin masih sesuai standar SNI atau sudah menurun sesuai umur ekonomisnya. Parameter pengamatan penelitian ini meliputi : bobot gabah, lama pengumpanan, bobot dan waktu pengupasan, kualitas beras pecah kulit dan konsumsi bahan bakar. Data yang diperoleh dianalisis untuk mendapatkan nilai kapasitas pengumpanan, kapasitas pengupasan, efisiensi, laju konsumsi bahan bakar dan kualitas gabah pecah kulit hasil pengupasan, selannjutnya dianalisis secara diskriptif. Hasil evaluasi kinerja diperoleh nilai kapasitas pengumpanan 996,4 ±1,5 kg/jam, kapasitas pengupasan 768 ± 20,1 kg/jam, efisiensi 76,1±1,5 %, rendemen 83,3±0,65 dan laju konsumsi bahan bakar 2,07±0,05 l/jam. Persentase beras pecah kulit utuh 74,7±1,26, memenuhi syarat SNI minimal 70%. Hasil evaluasi husker yang diuji masih layak untuk dioperasikan., Rice is the staple food of the majority of the Indonesian population. Rice is processed from paddy rice through several stages, starting from harvesting, threshing, cleaning, drying, stripping the rice husk, polishing, and packaging. Processing rice mechanically increases production and reduces yield losses. Husker is one of the machines used to remove the chaff (the outer husks) of grains of rice. This study aims to evaluate the performance of a double pass rice husker machine with 1000-1200 kg per hour in Sonorejo Village, Padangan District, Bojonegoro Regency. Husker has been operated for five years, whether the engine's performance is still according to SNI standards or has decreased according to its economic life. Parameters observed in this study include grain weight, feeding time, weight and time of stripping, quality of brown rice, and fuel consumption. The data obtained were analyzed to obtain the value of feeding capacity, stripping capacity, efficiency, rate of fuel consumption, and the quality of the brown rice, then analyzed descriptively. The results of the performance evaluation showed the value of feeding capacity 996.4 ±1.5 kg/hour, stripping capacity 768 ± 20.1 kg/hour, efficiency 76.1±1.5 %, yield 83.3±0.65 and fuel consumption rate 2.07±0.05 l/hour. The percentage of brown rice is 74.7±1.26, correspondingly with the SNI requirements of at least 70%. The evaluation results of the observed huskers showed that the husker is still feasible to operate.

Converting solar radiation into heat is one of the most common applications of solar energy. The purpose of using the solar air collectors is to raise the atmospheric air temperature to a higher temperature which can be used for various low and medium temperature applications. There are several designs of solar air collectors which are used in different applications. These types of solar collectors are designed based on the required heat capacity. This research develops mathematical equations of flat plate and v-groove solar air collectors with single and double pass flow to compare the thermal efficiency of each collector. Factors such as collector absorber design and airflow arrangement are the most important that influence the efficiency of solar collectors. The performance of the collector also depends on the heat loss of the collector and the absorber area that is on contact with that airflow. From the simulation it is found, V-groove double pass air collector has the highest efficiency value of 56% at flow rate of 0.06 kg/m2s.

Este proyecto presenta el diseño de un software que realiza un modelo simétrico de la marcha humana a partir del modelo de doble paso medio obtenido a partir de datos recogidos en el laboratorio SATI de la Universidad de Valencia, colocando sensores a diferentes hombres y mujeres mientras caminaban., This work presents the design of software that performs a symmetrical pattern of human walking basing on double step model making with data collected in SATI laboratory at the University of Valencia, by placing sensors at different men and women as they walked.

Este proyecto presenta el diseño de un software que realiza un modelo simétrico de la marcha humana a partir del modelo de doble paso medio obtenido a partir de datos recogidos en el laboratorio SATI de la Universidad de Valencia, colocando sensores a diferentes hombres y mujeres mientras caminaban., This work presents the design of software that performs a symmetrical pattern of human walking basing on double step model making with data collected in SATI laboratory at the University of Valencia, by placing sensors at different men and women as they walked.

[EN] Evaporating diesel sprays from three different multi-hole nozzles have been studied by means of three different and complementary techniques: Mie scattering, double-pass schlieren, and CH radical chemiluminescence. These three kinds of measurements provided valuable information that has allowed us to shed light on the influence of nozzle geometry on the air-fuel mixing and evaporation processes. For this purpose, three six-hole sac nozzles, with different orifice degrees of conicity have been used. These nozzles had been geometrically and hydraulically characterized in a previous publication, where important non-dimensional coefficients describing the nature of the flow have been evaluated. Injection at different pressure conditions has been carried out in an inert environment of gas to study the mixture process, avoiding window fouling by soot deposition from combustion. Studies have been carried out for three different injection pressures and four different gas densities during spray injection, representative of real engine conditions, with changing temperature and pressure in the discharge camera. Liquid-phase penetration and stabilized liquid length for all nozzles and pressure conditions have been determined with the Mie scattering technique. The cylindrical nozzle provided the highest value of the liquid length at a low injection pressure (30 MPa), because of its higher diameter and the absence of cavitation. When the two conical nozzles are compared, no clear differences have been shown between them. Because with this Mie scattering, it is not possible to follow the vapor behavior and considering constraints associated with the geometrical configuration of diesel sprays generated by the multi-hole nozzles, a double-pass schlieren technique has been used for this purpose. The combination of Mie scattering and schlieren allowed for the liquid and vapor phases to be analyzed in terms of penetration. As far as the CH radicals are concerned, these radicals ar

[EN] Evaporating diesel sprays from three different multi-hole nozzles have been studied by means of three different and complementary techniques: Mie scattering, double-pass schlieren, and CH radical chemiluminescence. These three kinds of measurements provided valuable information that has allowed us to shed light on the influence of nozzle geometry on the air-fuel mixing and evaporation processes. For this purpose, three six-hole sac nozzles, with different orifice degrees of conicity have been used. These nozzles had been geometrically and hydraulically characterized in a previous publication, where important non-dimensional coefficients describing the nature of the flow have been evaluated. Injection at different pressure conditions has been carried out in an inert environment of gas to study the mixture process, avoiding window fouling by soot deposition from combustion. Studies have been carried out for three different injection pressures and four different gas densities during spray injection, representative of real engine conditions, with changing temperature and pressure in the discharge camera. Liquid-phase penetration and stabilized liquid length for all nozzles and pressure conditions have been determined with the Mie scattering technique. The cylindrical nozzle provided the highest value of the liquid length at a low injection pressure (30 MPa), because of its higher diameter and the absence of cavitation. When the two conical nozzles are compared, no clear differences have been shown between them. Because with this Mie scattering, it is not possible to follow the vapor behavior and considering constraints associated with the geometrical configuration of diesel sprays generated by the multi-hole nozzles, a double-pass schlieren technique has been used for this purpose. The combination of Mie scattering and schlieren allowed for the liquid and vapor phases to be analyzed in terms of penetration. As far as the CH radicals are concerned, these radicals ar