Judul: Resistensi Relatif Beras Pecah Kulit dan Beras Sosoh Lima Varietas Padi asal Banyumas terhadap Serangan Sitophilus oryzae
Abstrak: The purpose of this study was to examine the resistance level of five different variety of brown rice and milled rice from Sitophilus oryzae attack during storage. Five varieties of rice that examined were Pandanwangi, Inpari 13, IR-64, Situ Bagendit, and Srikandi which all were planted in Banyumas region. This research was conducted in two experiments. The first experiment is done to measure the growth of Sitophilus oryzae during storage, while the second experiment is done to measure the rate of loss during storage. In the first experiment, 200 seeds of rice was infested by 5 couples of Sitophilus oryzae aged 7-15 days and kept for 7 days. The insects were then removed and the rice was observed every day for 14 days for emergence of the first generation (F1) of insects. The progenies were counted every day until there were no emergence for five consecutive days. The experiments were conducted in three replications. From this experiment, the parameters were number of progenies (Nt), development period (D), development index (ID), intrinsic rate of increase (Rm), and weekly multiplication capacity (λ). In second experiment, 100 g of rice infested by 25 insects and stored for 6 weeks. After 6 weeks, insects were removed and the storage loss were determined. In this second experiment, the parameters observed were percentage increase of water fraction, the loss of dry matter loss, and percentage of frass. Those two experiments were conducted in three replication. According to this experiment, Srikandi rice has the highest resistance towards Sitophilus oryzae attack among other varieties.
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Judul: The relative resistance of brown rice and milled rice from five rice varieties of superior paddy  from the attack of rice weevil sitophilus oryzae (l.)
Abstrak: In the storage stage, weight loss of grains such as paddy and rice was caused by storage pests such asSitophilusoryzae. This reseacrh was conducted to evaluate theresistance of rice of the so called superior paddy from the attack of post harvest pest, Sitophilusoryzae. The five varieties evaluated were Sintanur, Mamberamo, Inpari 13, Inpari 10, and Ciherang. In the present study both brown rice and milled rice are subjected to S. oryzae infestation. In the first experiment,10 adults insect aged 7 – 15 days were infested to 200 grains for 7 days. At the end of the infestation period the insects are removed and discarded. The infested grains are incubated for 14 days before observation of the emergence of progenies was conducted. The emerged progenies were counted daily until there is no emergence for 5 days consecutively. The parameters from this experiment are total population (Nt), development period (D), development index (ID), interinsic rate of increase (Rm) and weekly multiplication capacity (λ). In the second experiment, 100 gram of rice of both type was infested with 25 adults of S.oryzae The result of the research show that variety affect significantly (p<0.01) all of the parameters in first experiment and second experiment. The experiment showed that inform of brown rice, Inpari 13 with the values of Nt, D, ID, Rm, λ, percentage of weight loss, and percentage of holed grains of 43.67, 28.11, 13.09, 0.34, 1.42, 4.05, and 9.05 respectively was among the most resistance variety. On the other hand, in the form of milled rice, Mamberamo with the values of Nt, D, ID, Rm, λ, percentage of weight loss, and percentage of holed grains of 22.0, 39.0, 7.95, 0.14, 1.15, 7.2, and 7.37 respectively was among the most resistance variety. However based on the statistical analysis, the parameters of Inpari 13 variety in the form of milled rice were not significantly different from that of parameters of Mamberamo variety.The Inpari 13 variety was found to be the most promising variety to be establish as “unggul variety” as between the five varieties tested it is among the most resistance to the attack of Sitophilus poryzae both in the form of brown rice as well as milled rice. for 4 weeks. The parameters used in this experiment are total population (Nt), percentage of weight loss and percentage of holed grain.Parameters in first experiment and second experiment were subjected to correlation test with each paddy varieties intrinsic factor i.e. water content, protein content, and fat content.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular