Judul: Micro-Climate Characteristics of Multi Density Cassava Planting. Guided
Abstrak: The objective of this research was to understand the micro climate characteristics such as radiation, air temperature, relative humidity and intercepted radiation at cassaca plantation with different varieties, organic compounds and density at Cimahpar, Bogor. This characterization was based on micro climate observation at cassava plantation utilizing two instruments. First, the measurement was done by AWS (Automatic Weather Station) at the 20 MST (Week After Planting). Second, using Termokopel Blackbody Portable at 32 MST and 40 MST. Destructive sample data measurement was done to find the Leaf Area Index (LAI) of the cassava. Closer planting gap will increase the LAI. The LAI has a positive correlation with intercepted radiation. Intercepted radiation increase along with higher LAI to a maximum value, then it decline as LAI decrease due to aging and leaf falls around harvest period. Maximum value of LAI and intercepted radiation occur at 32 MST at density 1 m x 0,5 m (P1). LAI also influence other micro climate characteristics including solar radiation, air temperature and humidity. The lowest value of solar radiation and air temperature was found at 2 m x 2 m (P3). Generally, Adira variety appear with the highest value of LAI at all treatments. This was due to the relatively small yet large number of leafs which makes them look more dense. The characteristic of the Adira cause a bigger amount of radiation intercepted compared to the other variety. Next in row in LAI and intercepted radiation value is the UJ-5 variety then the Cicurug.
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Judul: Karakteristik Intersepsi Radiasi Matahari dan Produksi Tanaman Jagung Manis pada Arah Baris dan Kerapatan Berbeda
Abstrak: This study was conducted to determine the effect of row planting direction and plant population density on the change of specific leaf area (SLA), leaf area index (LAI), radiation use efficiency (RUE) and growth of sweet corn. The research was conducted from March to June 2013 in Cikabayan Research Station IPB Darmaga-Bogor, West Java, at altitude of ± 240 masl. The row planting direction was TB (East-West direction) and US (North-South direction). The planting spacing was J20 (70 x 20 cm) and J40 (70 x 40 cm). The meteorology factors being observed were the intensity of radiation, air temperature and humidity. Agronomic variables factors being observed were plant height, number of leaves, dry weight and yield component. The results showed the combination treatment of row direction and planting spacing did not significantly affect plant height, leaf number and total dry weight. However, the treatment has significant affect on dry plant at harvest. The interception of solar radiation in US treatment was 11% higher than the TB, while J20 treatment has 3% higher than J40. Radiation use eficiency of treatment TBJ20, TBJ40, USJ20, USJ40 were 2.97, 2.75, 3.16, and 3.14 g MJ-1 respectively. Dry seed yield of J20 was 5.98 ton ha-1, which was 20% greater than J40 population. Harvest index for TBJ20, TBJ40, USJ20 and USJ40 are 0.23, 0.19, 0.25 and 0.20.
Keyword: planting density, row direction, harvesting product, biomass production, radiation use efficiency, sweet corn

Judul: Katalis Zink Ferit Tersubstitusi Cu untuk Oksidasi Benzil Alkohol
Abstrak: Katalis berperan dalam menurunkan energi aktivasi. Katalis ZnFe2O4 dan ZnFe2O4 tersubstitusi Cu disintesis menggunakan metode kopresipitasi untuk digunakan dalam oksidasi benzil alkohol. Katalis dicirikan dengan spektrofotometer inframerah (FTIR) dan difraktometer sinar-X. Spektrum FTIR menunjukkan puncak serapan dari ikatan Zn-O dan Fe-O masing-masing pada rentang 559‒575 cm-1 dan 419‒447 cm-1. Difraktogram menunjukkan terbentuknya fase tunggal Zn0.6Cu0.4Fe2O4 pada katalis ZnFe2O4 tersubstitusi Cu 20%. Benzil alkohol dioksidasi dengan sistem refluks. Konversi benzil alkohol meningkat dengan meningkatnya suhu. Kadar benzaldehida yang dihasilkan dengan katalis ZnFe2O4 tersubstitusi Cu 20% lebih tinggi dibandingkan dengan katalis ZnFe2O4 yang tidak tersubstitusi dan yang tersubstitusi Cu 60 dan 80%. Hal tersebut menunjukkan bahwa katalis ZnFe2O4 tersubstitusi Cu 20% memiliki kinerja yang lebih baik dalam oksidasi benzil alkohol menjadi benzaldehida dengan kadar benzaldehida 8.763%.
Keyword: Benzil alkohol, katalis, oksidasi, ZnFe2O4