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: Kinerja Pemanenan Padi dengan Sabit, Paddy Mower, dan Combine Harvester pada Sistem Tanam Jajar Legowo.
Abstrak: Pemanenan padi dengan sabit masih mengalami masalah pada tingkat petani. Masalah yang ada berupa semakin berkurangnya tenaga pemanen dan susut panen yang tinggi. Teknologi baru diperlukan untuk mengatasi masalah tersebut. Tujuan penelitian ini adalah membandingkan kinerja pemanenan padi dengan sabit dan power thresher, paddy mower dan power thresher, dan combine harvester yang meliputi kapasitas lapangan efektif, susut panen, dan biaya pemanenan ; melakukan simulasi perhitungan efisiensi lapangan pemanenan dengan combine harvester pada beberapa ukuran petak sawah yang ada di wilayah Sukamandi. Kapasitas lapangan efektif pemotongan menggunakan sabit dan paddy mower berturut-turut mencapai 0.015 ha/jam/orang dan 0.035 ha/jam/orang. Kapasitas lapangan efektif pemanenan dengan combine harvester mencapai 0.58 ha/jam. Susut panen menggunakan sabit, paddy mower, dan combine harvester berturut-turut yaitu 6.98 %, 4.10 %, dan 5.11 %. Kapasitas perontokan padi yang dipanen dengan sabit dan paddy mower menggunakan power thresher berturut-turut sebesar 1.76 ton/jam dan 1.74 ton/jam dengan susut perontokan masing-masing sebesar 0.79 % dan 0.95 %. Biaya pokok pemanenan dengan sabit dan power thresher, paddy mower dan power thresher, dan combine harvester berturut-turut sebesar Rp 888,845/ha, Rp 828,493/ha, dan Rp 442,236/ha. Simulasi perhitungan efisiensi lapangan pemanenan menggunakan combine harvester berbanding lurus terhadap ukuran sisi panjang lahan. Semakin panjang lahan maka semakin tinggi efisiensi lapangan pemanenan yang berkisar antara 63.62 % - 81.24 %.
Keyword: combine harvester, kapasitas lapangan, paddy mower, sabit, susut panen

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.
Keyword: