Judul: Respon Pertumbuhan Jamur Tiram Putih (Pleurotus ostreatus) Pada Dua Kondisi Suhu dan Kelembaban Berbeda
Abstrak: White oyster mushroom (Pleurotus ostreatus) is one of the popular mushroom that is cultivated by using the micro-climate control technology which is made in the mushroom house (kumbung), in the highlands, such as the one in Pandan Sari (437mdpl), and also like the one in the lowlands such as in Kukupu (169mdpl). Based on the observations that was held for 88 days in Pandan Sari, the average temperature measured in the incubating house was 27.4oC, while the average temperature measured in the cultivation house was 26.7oC. The relative humidity recorded in the incubation house was around 87% while the relative humidity recorded in the cultivation house was around 88%. Based on the 70-days observations in Kukupu, the average temperature measured in incubating house was 28.5°C, while the average temperature measured in the cultivation was 27.7oC. The relative humidity recorded in the incubation house was around 82%, while the relative humidity recorded in the cultivation house was around 86%. The accounted mycelial phase`s heat unit in Pandan Sari were 974.6 degree days, while the accounted heat units in Kukupu were 907.0 degree days. The accounted heat units of fruiting body formation phases in Pandan Sari were 652.9 degree days, while the accounted heat units in Kukupu were 494.3 degree days. The differences of heat unit value is quite high (6.9% coefficient of variation in mycelium phase and 24.3% in fruiting body formation phase) at both locations due to the observations that was held for every seven days so that the measured heat unit lost its resolution. The average daily temperature in Kukupu is higher than in Pandan Sari, this leads to faster development of oyster mushrooms in Kukupu rather than the ones in Pandan Sari. Faster development of oyster mushrooms in Kukupu resulted in lighter average weight than the ones cultivated in Pandan Sari
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Judul: Kelayakan Usaha dan Nilai Tambah Olahan Jamur Tiram Putih (Pleurotus ostreatus) Di Bekasi
Abstrak: Bekasi is one of the area in West Java which has the lowest producing mushroom. The weather and the temperatures factor in Bekasi did not support the mushroom production. Nevertheles, it did not discourage the mushroom preneur to passion the oyster mushroom cultivation in Bekasi. One of them is CV. Megah Makmur Sentosa. Therefore, CV. Megah Makmur Sentosa has a plan to develop the oyster mushroom bussines through build a newlarge capasity kumbung to maximazing production capacity in a area in Bekasi. Feasibility study needs to analize a oyster mushroom bussiness. The main aspects in feasibility are non-financial aspect and financial aspect. Non-financial aspect are market, technical, management, legal, social, economy and enviromental. It’s also analyze many changes around bussiness using switching value. Switching value was used to analyze maximum changes in cost and benefit. More over, value added was another analysis tool that calculated the oyster mushroom product. The results will show feasible of investment to implement the oyster mushroom business. The results of the financial analysis showed, the NPV value is Rp 170.590.527, IRR value is 59,60 percent, Net B/C value is 2,50 and discounted payback periodfor 4,44 years. While the analysis of the sensitivity with using switching value method obtained the maximum limit of output reduction is 15,85 percent, maximum limit of oyster mushrooms price reduction is 18, 28 percent, and the increase ofgas LPG cost is 589, 66 percent. Results of analysis showed that business of white oyster mushrooms are sensitive in changes of output and price of white oyster mushroom but is not sensitive in changes of LPG gas cost. Value-added analysis on these two products of process white oyster mushroom as nugget and crispy mushroom showed that the value addedof nugget is Rp 54.295 per kilogram while value added of crispy mushroom is Rp 25.545 per kilogram. This was showed that nugget product has a value added larger than crispy mushroom products.
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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