Judul: Studi Antropometri Petani dan Aplikasinya pada Penggunaan Knapsack Sprayer di Kecamatan Wedung Kabupaten Demak Jawa Tengah
Abstrak: Knapsack sprayer (KS) is a sprayer which is operated manually with a lever and can be carried on the back of the operator. This tools are usually used by farmers for application of liquid matters in agriculture. The purpose of this study is to identify the anthropometric of farmers in Wedung District, Demak; ascertain level of compliance of KS to the farmer’s anthropometry; determine the appropriate dimension of KS which is match to farmers anthropometry. Data retrieval is performed using a random sampling method to get subject of 131 people whom consist of 69 male farmers and 62 female farmers, 50 measures of antropometric parameters which consists of 18 and 32 parameters of stand up and sit down position, respectively. Mean, standard of deviation, standard error of mean (SEM), and coefficient of variation (CV) of each antropometric measures were collected as well based on the antropometric data. As results, antropometric data of male and female were collected in 5th, 50th, and 95th percentiles. Dimensional design of KS was then analyzed. The results revealed that optimum dimension of KS’s tank for wedung male and female farmers respectively are 44x33x14 and 42x32x14 (in centimeters), with optimum inlay is 20 and 16 kilogram. The optimum length dimension of pump’s grip is 9 cm (male) and 8 cm (female), and 3.5 cm (wide dimension). The optimun length dimension of sprayer’s grip is 11.5 cm (male) and 10.5 cm (female), with 2.5 and 1.65 cm for middle and below diameters, respectively. The optimum length dimension of hose is 83 cm (male) and 78 cm (female).
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Judul: Desain Konseptual Knapsack Sprayer untuk Budidaya Kelapa Sawit melalui Pendekatan Ergonomi.
Abstrak: Designing a tool/machine needs ergonomics aprroach in order to match between man-machine system. One of the important tools in oil palm cultivation is knapsack sprayer. This study was conducted in aiming to understand risk occupational knapsack sprayer operation. So, ergonomic analysis is needed for these activities to understand the need of intervention to reduce the risks of working and complaints that occur. Based on Nordic Body Map questionnaire, the operator of knapsack sprayer suffered muscular fatigue and pain on the leg (28%), the left upper arm (27%) and the neck (14%). Based on the Range of Motion’s criteria, dangerous zone (Zone 3) were identified on hip flexion, shoulder flexion and neck flexion. Futhermore, REBA method was applied to evaluate the work posture in detail. The REBA revealed that score of 8 or more were resulted on “Loading”, “Pumping”, and “Spraying” work elements. These mean that the work element were high level of MSD’s risk, thus changing in the working condition is needed soon. Workload analysis found that 17 kg of total weight knapsack sprayer with the dimension of knapsack sprayer’s tank is (390 x 171 x 534) mm and pump lever length is 720 mm. Recomamanded resting time for knapsack sprayer operator is 125 minutes for 4 hours efective working time.
Keyword: knapsack sprayer, nordic, REBA, ROM

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology