Judul: Study of the Use of LED Growlight Lights and Sponge Planting Media on Indoor Vertical Garden Plants Scindapsus aureus (Lindl. & Andre) Engl.
Abstrak: Peningkatan jumlah penduduk dapat menyebabkan banyaknya ruang terbuka hijau yang dialihfungsikan menjadi pemukiman. Taman vertikal merupakan salah satu solusi dari kurangnya ruang terbuka hijau. Namun, saat ini, taman vertikal tidak hanya dirancang di luar ruangan, tertapi juga di dalam ruangan. Penanaman taman vertikal di dalam ruangan tentunya membutuhkan perhatian lebih, terutama dari segi pencahayaan. Lampu LED dapat menjadi solusi untuk menggantikan sinar matahari di dalam ruangan. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan lampu LED growlight dengan intensitas cahaya berbeda terhadap pertumbuhan tanaman taman vertikal Scindapsus aureus dengan berbagai ukuran media tanam spons dan memberikan rekomendasi intensitas cahaya lampu LED growlight yang optimal bagi pertumbuhan tanaman Scindapsus aureus. Metode yang digunakan dalam penelitian ini yaitu split plot design dengan dua faktor percobaan. Faktor pertama adalah faktor intensitas cahaya dengan tiga taraf percobaan, yaitu intensitas cahaya 100 lux, 200 lux, dan 300 lux. Faktor kedua adalah faktor ukuran media tanam spons dengan tiga taraf percobaan, yaitu lebar spons 10 cm, 15 cm, dan 20 cm. Hasil penelitian menunjukkan bahwa tanaman Scindapsus aureus dapat ditanam di dalam ruangan dengan menggunakan media tanam spons dan cahaya alternatif dari lampu LED growlight. Tidak ada perbedaan nyata antara intensitas cahaya yang digunakan. Namun terdapat perbedaan nyata pengaruh ukuran media tanam spons yang digunakan terhadap pertumbuhan panjang batang tanaman. Ukuran spons terbaik pada penelitian ini adalah spons dengan lebar 20 cm. Interaksi cahaya dan ukuran media tanam spons juga berpengaruh nyata terhadap pertumbuhan panjang batang tanaman. Interaksi cahaya dan ukuran spons terbaik pada peneliatian ini yaitu interaksi intensitas cahaya 200 lux dan spons dengan lebar 20 cm., The increasing number of population can cause many green open spaces to be converted into residential areas. Vertical gardens are one solution to the lack of green open space. Currently, vertical gardens are not only grown outdoors, but also indoors. Indoor vertical gardening requires extra attention, especially in terms of light. LED lights can be a solution to replace sunlight in the room. This study aims to determine the effect of using LED growlight lamps with different light intensities on the growth of Scindapsus aureus as vertical garden plants with various sizes of sponge planting media and provide recommendations for the optimal light intensity of LED growlight lamps for the growth of Scindapsus aureus. The method used in this research is a split plot design with two experimental factors. The first factor is the light intensity with three experimental levels, namely light intensity of 100 lux, 200 lux, and 300 lux. The second factor is the size of the sponge planting medium with three experimental levels, namely sponge width of 10 cm, 15 cm and 20 cm. The results of this research show that scindapsus aureus plants can be grown indoors using sponge growing media and alternative light from LED growlights. There is no significant difference between the light intensities used. However, there is a significant difference in the influence of the size of the sponge planting medium used on the growth of plant stem length. The best sponge size in this study was a sponge with a width of 20
Keyword: LED growlight, Light Intensity, Plant Growth, Scindapsus aureus, Vertical Garden

Judul: The Effect of Hydrogel as Planting  Media Application and Watering Frequency on Plants (Scindapsus aureus L) In  Vertical Greenery
Abstrak: Peningkatan penduduk menyebabkan ruang terbuka hijau semakin terbatas karena meningkatnya area terbangun. Vertical greenery merupakan suatu inovasi dalam infrastruktur untuk permasalahan penghijauan di perkotaan. Konsep vertical greenery merupakan penanaman yang dilakukan pada struktur vertikal yang memberikan sumbangan oksigen (O2) bagi manusia, menjadikan bangunan ramah lingkungan yang memiliki ruang hijau, dan memberikan naungan yang dapat mengurangi efek radiasi panas. Media tanam merupakan salah satu alasan utama dalam permasalahan masyarakat masih enggan menerapkan Vertical greenery. Media tanam sangat perlu diperhatikan dalam penerapan vertical greenery karena media tanam merupakan tempat pertumbuhan tanaman. Hydrogel diharapkan dapat menjadi salah satu alternatif untuk media tanam vertical greenery karena hydrogel memiliki kemampuan untuk menyerap atau menyimpan air yang baik. Tujuan penelitian untuk mengetahui pengaruh penggunaan hydrogel sebagai media tanam untuk vertical greenery, pertumbuhan vegetatif tanaman, dan frekuensi penyiraman yang optimal untuk pertumbuhan tanaman. Percobaan dilakukan menggunakan Rancangan Acak Lengkap (RAL). Hasil penelitian menjelaskan perlakuan hydrogel 200gr/pot dengan frekuensi penyiraman tiap 6 hari (M1P2) memiliki hasil tertinggi terhadap seluruh parameter. Selain itu, bobot media tanam hydrogel dengan jumlah lebih berat dan jumlah lebih ringan tidak berpengaruh nyata terhadap pertumbuhan tanaman sirih gading, sementara itu frekuensi penyiraman berbeda nyata pada setiap parameter, tetapi interkasi faktor media tanam hydrogel dengan frekuensi penyiraman hanya berpengaruh nyata terhadap lebar daun, dan Panjang daun. Penelitian ini menjelaskan bahwa media tanam hydrogel dapat digunakan sebagai media tanam alternatif pada vertical greenery., The increase in population has led to limited green open space due to the increase in built-up area. Vertical greenery is an innovation in infrastructure for urban greening problems. The concept of vertical greenery is a planting carried out on a vertical structure that contributes oxygen (O2) for humans, makes environmentally friendly buildings that have green spaces, and provides shade that can reduce the effects of heat radiation. Planting media is one of the main reasons in the problem of people still reluctant to apply Vertical greenery. Planting media is very important to note in the application of vertical greenery because planting media is a place of plant growth. Hydrogel is expected to be one of the alternatives for vertical greenery planting media because hydrogel has the ability to absorb or store good water. The purpose of the study was to determine the effect of using hydrogel as a planting medium for vertical greenery, determine the vegetative growth of plants, and the optimal watering frequency for plant growth. The experiment was conducted using a completely randomized design (CRD). The results explained the treatment of hydrogel 200gr / pot with a frequency of watering every 6 days (M1P2) has the highest results on all parameters. In addition, the weight of hydrogel growing media with heavier amounts and lighter amounts is not significantly different on the growth of ivory betel plants, while the frequency of watering is significantly different on each parameter, but the interaction of hydrogel growing media factors with watering frequency is only significantly different on leaf width, and leaf length. This study explains that hydrogel planting media can be used as an alternative planting media in vertical greenery.
Keyword: hidrogel, vertical greenery, vertical gareden, alternatif media tanam, taman vertikal, tata hijau

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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