Judul: Periode pembungaan pohon pada musim hujan dan aplikasinya dalam taman
Abstrak: Tanaman merupakan salah satu elemen utama pembentuk lanskap pada taman. Tanaman dapat dikategorikan menjadi tanaman penutup tanah, semak, perdu, dan pohon. Tiap kategori memiliki fungsi yang berbeda. Pohon memiliki fungsi sebagai pelindung, peneduh, display, dan pengarah yang berasal dari tinggi pohon, tekstur dan warna daun, bunga, dan bentuk tajuk pohon. Beberapa pohon menunjukan karakter kuat terhadap warna yang ditampilkan oleh bunga. Informasi dan studi terhadap jenis pohon serta periode pembungaan masih terbatas. Studi yang dapat dilakukan untuk mengetahui waktu pembungaan salah satunya adalah dengan studi fenologi. Penelitian ini bertujuan untuk mengetahui masa pembungaan pada pohon berbunga serta aplikasi penggunaannya dalam taman. Penelitian dilakukan selama 6 bulan dengan menggunakan 10 jenis pohon dari berbagai jenis famili. Penelitian ini menggunakan metode grid dari salah satu perangkat lunak (software) untuk menghitung persentase penutupan bunga pada tajuk sehingga mempermudah penelitian, serta menggunakan metode regresi linear untuk mengetahui hubungan antara periode pembungaan dengan faktor iklim. Berdasarkan hasil analisis, 3 dari 10 jenis pohon menunjukkan hubungan signifikan antara persentase pembungaan dengan faktor iklim, yaitu spesies Jacaranda acutifolia, Plumeria rubra dan Tabebuia caraiba. Hasil tersebut menunjukkan pembungaan J. acutifolia secara signifikan dipengaruhi oleh faktor iklim, yaitu kelembaban udara. Peningkatan nilai kelembaban udara cenderung meningkatkan persentase bunga. Peningkatan nilai selisih suhu maksimumminimum dan lama penyinaran cenderung meningkatkan persentase bunga, sedangkan peningkatan jumlah hari hujan dan kelembaban udara cenderung menurunkan persentase bunga Plumeria rubra. Hasil serupa juga ditunjukkan oleh Tabebuia caraiba. Pembungaan T. caraiba dipengaruhi secara signifikan oleh faktor iklim, antara lain selisih suhu maksimum dengan minimum, lama penyinaran, hari hujan, dan kelembaban udara. Hasil akhir dari penelitian ini berupa rekomendasi aplikasi penataan pohon berbunga dalam suatu desain taman.
Keyword: flowering period, flowering tree, garden design, phenology

Judul: Periode Pembungaan dan Aplikasinya dalam Taman
Abstrak: Trees is one of the vegetation that can be an attraction in landscape. Some trees show a strong character in color which is presented by flower. Nowadays, information and studies about the types of trees and flowering period is still limited. One of the studies that can be conducted to determine the time of flowering periode is phenology. This study aims to determine the flowering period of trees and the application in site design. The study was conducted for 6 months using 10 species of trees from the different types of families. This study used a grid method to count percentage of coverage flowers in the canopy and linear regression method to determine the relation between flowering periode and climatic factors. Based on the results, Samanea saman and Tabebuia caraiba showed there is a significant influence of climate factors to flowering percentage. The result of this study showed the flowering of S. saman is significantly influenced by climatic factors, such as maximum-minimum temperature difference, daylight, and frequency of rain. The increasing of the temperature difference between minimum and maximum and daylight tends to increase flowers percentage of S. Saman, whereas the increasing of percentage frequency of rain tend to decrease it. Flowers percentage of T. caraiba also significantly influenced by daylight. The increasing of daylight tend to increase it flowers percentage. The final product of this study is a recommendation of application of flowering trees in a site design.
Keyword: phenology, garden design, flowering tree, flowering period

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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