Judul: Studi Tinggi Pemotongan Padi pada Kegiatan Panen Manual dan Perontokan Menggunakan Throw-In Type Power Thresher.
Abstrak: One way of threshing paddy grain is using throw-in type power thresher. Before threshing, paddy is cut at the upper point of the straw. The purpose of this study was to measure and compare the losses and working performances during cutting, transporting, and threshing among the height of 30, 40, 50 and 60 cm cutting above the ground with sickle and power thresher. The 40 cm height of cutting gave the lowest losses and total cost, those are 4.59 %, Rp 2 043 360/ha for Ciherang dan 5.03 %, Rp 1 704 860/ha for Inpari 13. The 60 cm height of cutting gave the best capacity, EFC (Effective Field Capacity) of cutting, EFC of transporting, and EFC of threshing are 0.005 ha/hour.person, 0.075 ha/hour.person, dan 0.191 ha/hour for Ciherang and 0.006 ha/hour.person, 0.104 ha/hour.person, dan 0.215 ha/hour for Inpari 13. Those factors can be taken into consideration, especially in selecting the height of cutting paddy based on the amount of losses and benefits that are caused by grain losses, costs, and work performances.
Keyword: capacity, paddy, height, losses, cutting

Judul: Performance and Economics Test of Rice Combine Harvester in Innovation Village, Subang, West Java
Abstrak: Penanganan padi siap panen merupakan salah satu kunci untuk meningkatkan perolehan hasil dari kemungkinan pengurangan nilai susut. Proses pemanenan padi di Indonesia banyak dilakukan secara manual dengan cara dipotong dengan menggunakan sabit dan perontokan dengan cara digebot yang berdampak pada susut yang tinggi. Penggunaan alat dalam memanen padi seperti combine harvester sudah banyak ditemukan karena memiliki susut yang relatif kecil, namun kalah bersaing karena stigma akan biaya operasional yang terlalu mahal yang akan berdampak pada pendapatan petani. Penelitian ini bertujuan untuk menganalisis aspek kinerja dan ekonomi dari penggunaan combine harvester sebagai alat bantu proses pemanenan padi; membandingkan hasil analisis pemanenan padi menggunakan combine harvester dengan cara manual; serta menganalisis kelayakan usaha mesin combine harvester di Kampung Inovasi Subang, Desa Kiarasari, Kecamatan Compreng, Kabupaten Subang. Penelitian dilakukan dengan mengamati beberapa variabel dalam pemanenan secara manual dan pemanenan dengan menggunakan combine harvester. Variabel yang diamati berupa variabel kinerja berupa kapasitas lapang efektif (KLE) dan kapasitas lapang teoritis (KLT) pemanenan secara mekanis (ha/jam), KLE dan KLT pemanenan secara manual, efisiensi lapang pemanenan (ELP) (%), susut panen (%), dan variabel ekonomi berupa biaya pokok pemanenan (Rp/ha). KLE pemotongan dengan sabit memiliki nilai rata-rata sebesar 0,018 ha/jam/orang dan efisiensi pemotongan sebesar 77% sedangkan KLE menggunakan combine harvester sebesar 0,5047 ha/jam dan efisiensi pemotongannya sebesar 82,28%. Susut hasil pemotongan padi menggunakan sabit sebesar 7,50% dengan susut perontokannya sebesar 0,086% sehingga total susut sebesar 7,59%, sementara susut total pemanenan menggunakan combine harvester sebesar 0,067%. Biaya total pemanenan dengan metode manual (sabit + power thresher) sebesar Rp 3.531.577,00 /ha, sedangkan biaya total yang dengan combine harvester sebesar Rp 1.857.143,00 /ha., Handling ready-to-harvest rice is one of the keys to increasing yield gain from possible reduction in value of losses. The process of harvesting rice in Indonesia is mostly done manually by cut using a sickle and threshing with digebot which has an impact on high shrinkage. The use of tools in harvesting rice such as a combine harvester has been widely found because it has a relatively small shrinkage, but it is less competitive because of the stigma of operational costs that are too expensive which will have an impact on farmers' income. This study aims to analyse the performance and economic aspects of using a combine harvester as a tool for rice harvesting; compare the results of rice harvesting analysis using a combine harvester with the manual method; and analyse the business feasibility of combine harvester machines in Subang Kampung Inovasi, Kiarasari Village, Compreng Subdistrict, Subang Regency. The research was conducted by observing several variables in manual harvesting and harvesting using a combine harvester. The variables observed were performance variables in the form of effective field capacity (KLE) and theoretical field capacity (KLT) of mechanical harvesting (ha/h), KLE and KLT of manual harvesting, harvesting field efficiency (ELP) (%), harvest shrinkage (%), and economic variables in the form of cost of harvesting (Rp/ha). The ELP of cutting with sickle has an average value of 0,018 ha/hour/person and cutting efficiency of 77% while the ELP using combine harvester is 0,5047 ha/hour and the cutting efficiency is 82,28%. The shrinkage of rice
Keyword: biaya operasional, combine harvester, panen padi, produktivitas, susut, operational cost, productivity, rice harvesting, shrinkage

Judul: Pelabelan Super Vertex Magic
Abstrak: Super vertex magic labeling is labeling on graph with is a set of edges mapped into and is a set of vertices mapped into . It has a vertex magic labeling in which and represents the size and order of the graph respectively. This manuscript proves that paths, cyclics, and disjoint union of cyclics have a super vertex magic labeling. There are four theorems to be discussed. The first theorem proves that path is super vertex magic if and only if is odd and . The second theorem proves that cyclic is super vertex magic if and only if is odd. The third theorem proves that bijection function from an edge set onto of graph can be extended to a super vertex magic labeling if and only if the set amount of edge label that incidents with a vertex in the graph, consists of sequential integers as many as vertices in the graph. The fourth theorem proves that disjoint union of the cyclics consists of cyclics with each cyclic has vertices is super vertex magic if and only if and are odd.
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