Judul: Kemasan Cerdas dari Polivinil Alkohol dengan Selulosa Whiskers sebagai Penguat Film untuk Deteksi Kesegaran Ikan
Abstrak: Kemasan cerdas dapat memberi informasi kepada konsumen tentang kesegaran bahan pangan. Salah satu jenis kemasan cerdas adalah kemasan dengan indikator mutu pangan yang dapat mendeteksi kerusakan pada pangan dan mudah diamati. Namun, kemasan cerdas ini belum tersedia secara komersial di Indonesia. Kemasan yang digunakan pada penelitian ini berbahan dasar Polivinil Alkohol, selulosa whiskers, asam sitrat, dan glutaraldehida sebagai agen penaut silang dengan bromokresol hijau sebagai indikator warna. Kemasan memiliki nilai kuat tarik yang menurun dan persen pemanjangan meningkat dengan berambahannya selulosa whiskers. Spektrum inframerah menunjukkan puncak OH pada bilangan gelombang 3358 cm-1 dan 3398 cm-1, CH pada bilangan gelombang 2897 cm-1 dan 2920 cm-1 Morfologi permukaan film selulosa whiskers terbentuk seperti bundelan. Indeks kristalinitas selulosa whiskers sebesar 93%. Warna kemasan berubah dari kuning menjadi biru.
Keyword: kemasan cerdas, kesegaran ikan, polivinil alkohol, selulosa whiskers

Judul: Kemasan Cerdas Polivinil Alkohol-Kitosan dengan Nanowhisker Cellulose sebagai Reinforcement Agent untuk Deteksi Kesegaran Ikan
Abstrak: Ikan mudah menurun mutunya selama penyimpanan. Oleh karena itu, diperlukan suatu kemasan yang dapat mengendalikan kesegaran ikan dengan mudah. Penelitian ini menghasilkan kemasan cerdas dari polivinil alkohol (PVA) dan kitosan dengan nanowhisker cellulose (NWC) sebagai agen penguat untuk mendeteksi kesegaran ikan. Film PVA-kitosan ditambahi glutaraldehida sebagai agen penaut silang dan NWC sebagai penguat. Film dicetak pada pelat kaca dan dikeringkan pada suhu ruang. NWC berasal dari selulosa mikrokristal dengan hidrolisis asam dan dicirikan menggunakan penganalisis ukuran partikel. Ukuran NWC yang diperoleh ialah 25.59 dan 226.1 nm. Tambahan NWC pada film mampu meningkatkan sifat mekanik film. Berdasarkan spektrum inframerah, taut silang antara PVA dan kitosan oleh glutaraldehida berhasil terjadi. Evaluasi kinerja film pada ikan menujukkan terjadinya perubahan warna film seiring dengan menurunnya kesegaran ikan.
Keyword: kemasan cerdas, kitosan, nanowhisker

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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