Aidil Haryanto

The Picohydro with 2500 Watts of output power designed by The Center of Appropriate Technology Development - Indonesian Institute of Sciences (B2PTTG-LIPI) has been implemented in Gunung Tua Village, Sub District of Cijambe, District of Subang, West Java Province in 2011. At electric generator installation by water power, an analysis of water availability estimation for the purpose above is needed. One alternative of method to analyze it is by using Curve Number method. In other hand the result of water availability calculation can be used as reference of calculation of waterworks construction and also determination of level of electric generator capacities that will be used. The value of runoff curve number is 78. The highest drainage occurred on February as high as 3517.38 litres/second and the lowest drainage occurred on August as high as 340.67 litres/second. The area of watershed at the activity location is 960 hectares. With the height of waterfall 10 m and assumption of generator efficiency picohydro as high as 50%, will obtain energy electrics as high as 175.85 kWatt on February and 17.05 kWatt on August. When the water source comes from the absorbed rain water by the ground with maximum retention potency is 6.67 and delivered with the shape of ground water that goes to water channels, which is water source to move the picohydro turbine, then the highest water stream on February is 235.66 litres/second with acquirement of electric energy as high as 11.8 kWatt, and the lowest on August is 22.82 litres/second with acquirement electric energy as high as 1.145 kWatt.

Drying agricultural products with solar power to maintain quality and extend the shelf life of agricultural products has been done by many farmers because it is easy and cheap to do. However, the availability of solar heat may be different every day and is greatly influenced by weather conditions causing different drying times for the product to reach the desired moisture content. This research aimed to develop a real-time water content measurement system during drying process. Measurement of water content was carried out using a weight measurement approach by a loadcell sensor. Data processing was carried out using the internet of things (IoT) -based digital data processor so that the measurement results could be seen remotely. Tests were carried out by drying the moringa (Moringa oleifera) leaves for 6 hours. A comparison measurement of water content was also done every hour by a gravimetric method using Halogen moisture meter Toledo Metler HB43-S. The results showed a good match ...

Abstract : Supervisors in 4 specialties differed in the importance they attached to selected qualifications in subordinates, when these subordinates were known to them only by patterns of trait scores. The technical problems considered in the statistical analyses involve some recent developments in the application of regression techniques. Groups of 50 supervisors in AFSCs 43171, 43190, 64670, and 64770 rated a set of 250 profiles of trait scores representing subordinates in AFSCs 43151, 43171, 64650, and 64750. Each supervisor assigned 250 worthto-the-Air Force ratings, using a 9-point scale and fixed allotments of each value. These ratings served as criteria, with the trait scores as predictors, providing a regression equation for each rater (his policy). Using the Judgment Analysis (JAN) technique, the policies were grouped, and the loss in prediction computed when moving from 50 different equations (policies) to a single equation for a given specialty. Average predictions were high, and the grouping loss small. Comparing JAN to factor analysis techniques, it was concluded that the JAN method was efficient, but that a factor strategy method aided in qualitative interpretation of rater policies. Demographic and personal data collected on the raters showed no meaningful relationship to their policies.

At present mixing of nutrients in the hydroponic is still done manually (ineffective and inefficient). For that we need a tool that can mix plant nutrients equipped with a system that regulates the amount of solute (Total Dissolved Solid, TDS with ppm units) and agitator. The design consist of structural and functional, construction, testing and cost analysis. The results obtained dimensions of 0,85 m x 0,55 m x 1,55 m, consisting of a reservoir, container nutrition with a capacity of 100 liters equipped with agitators driven by a 45 watt DC motor. The performance of the electrical system is carried out to ensure adequate nutrition (indicated with TDS value) and water level in the reservoir. TDS flatness testing and nutrient temperature every 720 seconds in the range of 3600 seconds at 5 points, each has an average deviation of 1,443% + 5% and 4,9054% + 5%. Testing of planting using mixing equipment in pakcoy and spinach plants was 5,95 kg and 2,5056 kg more than without using a mix...

Experimental investigation of a rotary desiccant wheel is presented in this study. The rotary desiccant wheel without honeycomb matrix structure is tested where silica gel is used as the desiccant material. The dehumidification experiment shows the humidity ratio decreased from 0.0205 kg/kg to 0.0182 kg/kg. Due to it has the potential to be a drying machine, an initial drying experiment was also carried out to see the performance of this machine. The drying process shows the machine can reduce the moisture content of the noodle product from 33.86% to 9.95% in 17 hours. Results show that thermal, regeneration, and dehumidification effectiveness is up to 24%, 14% and 11%, respectively.

Penelitian ini bertujuan untuk mengevaluasi karakteristik pengeringan lapisan-tipis irisan singkong dengan menggunakan pengering inframerah pada skala pilot untuk memenuhi kebutuhan usaha kecil dan menengah. Penelitian dilakukan pada dua tingkat temperatur “set-point” yaitu 50oC dan 60oC. Irisan singkong sebanyak 6 kg dengan kadar air awal 60–68 persen pada basis basah dikeringkan dalam pengering menjadi kadar air 14 persen. Setiap 30 menit, udara pengering diukur temperaturnya dan irisan singkong yang dikeringkan dianalisis kadar airnya. Hasil penelitian memperlihatkan bahwa waktu pengeringan lebih cepat dengan peningkatan temperatur set-point dan sekitar 44–62 persen kadar air teruapkan selama pengeringan 3-4 jam. Berkaitan dengan kinetika pengeringan, dua buah model matematika diujikan terhadap data eksperimen. Ditemukan bahwa model Page lebih dapat mempresentasikan pola pengeringan irisan singkong dibandingkan model Henderson-Pabis. This study is aimed to evaluate the characteri...

Soy sauce is one type of dark brown condiment, distinctive smell, salty or sweet taste, lumpy, and contains protein produced from fermented. One of the machines that can be used for cooking soy sauce is a pressure vessel as cooking pan with an agitator. Agitation is a process of mixing and stirring and are carried out by heat transfer and mass inter-phases or with external surfaces (due to outside influences). The agitator is a system used for mixing and stirring accompanied by a phase change. In the design of rotating machinery, it is necessary to predict the dynamic characteristic in bending and in torsion to avoid failure. Dynamic characteristics analysis of agitator design for soy sauce cooking process consists of mechanical vibration analysis and mass unbalance response. The stiffness method for the agitator shaft by dividing the shaft element into two elements based on the bearing position. The bearing is assumed to be roller supports and only moves in the direction of translation and rotation. Based on the dynamic characteristics of rotordynamics prediction by using finite element method both theoretical and software, the agitator in operating conditions with the rotation speed of 5 RPM according to Campbell diagram will not fail. The highest amplitude of the mass unbalance response is less than 2.5×10−2 mm.

The Picohydro with 2500 Watts of output power designed by The Center of Appropriate Technology Development - Indonesian Institute of Sciences (B2PTTG-LIPI) has been implemented in Gunung Tua Village, Sub District of Cijambe, District of Subang, West Java Province in 2011. At electric generator installation by water power, an analysis of water availability estimation for the purpose above is needed. One alternative of method to analyze it is by using Curve Number method. In other hand the result of water availability calculation can be used as reference of calculation of waterworks construction and also determination of level of electric generator capacities that will be used. The value of runoff curve number is 78. The highest drainage occurred on February as high as 3517.38 litres/second and the lowest drainage occurred on August as high as 340.67 litres/second. The area of watershed at the activity location is 960 hectares. With the height of waterfall 10 m and assumption of generator efficiency picohydro as high as 50%, will obtain energy electrics as high as 175.85 kWatt on February and 17.05 kWatt on August. When the water source comes from the absorbed rain water by the ground with maximum retention potency is 6.67 and delivered with the shape of ground water that goes to water channels, which is water source to move the picohydro turbine, then the highest water stream on February is 235.66 litres/second with acquirement of electric energy as high as 11.8 kWatt, and the lowest on August is 22.82 litres/second with acquirement electric energy as high as 1.145 kWatt.