Judul: Pengaruh Intensitas Cahaya Matahari Terhadap Pertumbuhan Jenis Shorea parvifolia dan Shorea leprosula dalam Sistem TPTI Intensif (Studi Kasus di Areal IUPHHK-HA PT. Sarpatim, Kalimantan Tengah)
Abstrak: Silvicultural system of Intensive Indonesian Selective Cutting and Planting (TPTI) comprises the techniques of regeneration, tending and harvesting of a stand or forest for producing certain products, and is designed to create sustainable management of natural production forest. In relation with that, there is a need for research on the effect of light intensity on the growth of Shorea parvifolia and Shorea leprosula species (meranti), to obtain information on light intensity where the growth of meranti is maximum. Such information could be used as the basis of consideration in the action of environmental manipulation on intensity of lights which enter the forest floor, to increase the growth of the two species of tree for achieving high productivity. The research was conducted in operational planting strip in block of PUP (Permanent Measurement Plot) of RKT (Annual Working Plan) 2005 and 2006, with 4 plots, and in each plot there were 3 planting strips comprising 120 strip plants. Plot size was 100 m X 100 m. The collected primary data were among other things total height of plants, plant diameter, wet bulb and dry bulb air temperature, humidity, light intensity in the planting strip and health condition of the trees. The collected secondary data were among other things site map, general condition of the research site (which comprised site geographic position, climate, rainfall, soil type, topography), and data of the tree diameter and height of the previous years. Diameter growth of Shorea parvifolia in plot which was rather steep of strip 2 possesed the greatest increment (1.59 cm / year) which differed significantly at 5 % level, and was affected by sunlight intensity as much as 6.85 %. On the other hand, diameter growth in level plot of strip 2 possessed the largest increment of 2.91 cm / year which differed significantly at 5 % level and was affected by sunlight intensity of 16.6 %. It could be shown that the diameter growth of Shorea leprosula was greater than that of Shorea parvifolia. The largest increment of diameter and height of S. parvifolia were respectively 1.59 cm / year and 140.88 cm / year. The largest increment of diameter and height of S. parvifolia were respectively 1.50 cm /year and 247.05 cm / year. The largest increment of diameter and height of S. leprosula were respectively 2.91 cm /year and 217.58 cm / year. The largest increment of diameter and height of S. leprosula were respectively 2.95 cm /year and 289.35 cm / year. During observation of S. parvifolia and S. leprosula growth, there were diameter increments as affected by IC sunlight exposure as large as 1.59 cm / year with IC exposure of 397.07 foot candle; and 2.91 cm / year with IC exposure 278.2 foot candle.
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Judul: Respon pertumbuhan meranti merah terhadap lebar jalur tanam dan intensitas cahaya matahari dalam sistem silvikultur TPTJ (Studi kasus di areal PT. Sarpatim, Kalimantan Tengah)
Abstrak: Shorea leprosula merupakan salah satu jenis meranti merah yang termasuk kedalam spesies target dan menjadi unggulan dalam teknik silvikultur intensif (SILIN), serta memiliki prospek yang baik untuk dikembangkan dalam membangun hutan tanaman meranti di Indonesia. Penelitian ini bertujuan untuk mengetahui pertumbuhaan S. leprosula dalam sistem silvikultur TPTJ dan pengaruh lebar jalur tanam, penutupan tajuk, dan intensitas cahaya matahari terhadap pertumbuhannya. Penelitian ini dilakukan pada sistem silvikultur TPTJ yang terdapat pada plot TPTJ 2005, 2006, 2007, 2008, 2009, 2010, dan 2011. Masing-masing plot dibuat petak berukuran 100 x 100 m dan dipilih 4 jalur sebagai jalur pengamatan dan pengukuran. Data yang dikumpulkan berupa diameter dan tinggi tanaman, lebar jalur, penutupan tajuk, dan intensitas cahaya matahari. Hasil penelitian menunjukkan bahwa pertumbuhan S. leprosula yang ditanam dalam sistem silvikultur TPTJ tergolong dalam pertumbuhan yang cepat dengan rata-rata riap diameter 1,32 cm/tahun, riap tinggi 1,61 cm/tahun, dan persentase hidup 86,57%. Lebar jalur tanam berpengaruh nyata terhadap riap diameter dan tinggi tanaman pada taraf nyata 5%. Hasil regresi menunjukkan bahwa penutupan tajuk berpengaruh nyata terhadap pertumbuhan riap diameter dan tinggi tanaman S. leprosula dan intensitas cahaya matahari berpengaruh nyata terhadap pertumbuhan riap diameter. Pertumbuhan riap terbaik terdapat pada plot TPTJ 2009 dengan riap diameter 1,63 cm/tahum dan riap tinggi 1,91 m/tahun pada lebar jalur 5 m, penutupan tajuk 77,71% dan intensitas cahaya matahari 10.632 lux. Kata kunci: pertumbuhan, Shorea leprosula Miq., lebar jalur tanam, intensitas cahaya matahari, TPTJ
Keyword: Growth, Shorea leprosula Miq., width of planting line, Light intensity, TPTJ

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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