Judul: Mempelajari Pengaruh Debit Aliran Dan Tinggi Terjun Air Terhadap Kecepatan Putaran Dan Kapasitas Pembangkit Tenaga Listrik Pada Turbin Air
Abstrak: Air merupakan sarana yang penting di dalam kehidupan manusia, hewan ataupun tumbuh-tumbuhan. Di samping itu juga merupakan sumber tenaga yang disediakan alam, sebagai pembangkit temaga mekanis ataupun tenaga listrik, yaitu dengan bantuan alat berupa kincir, turbin air dan generator pembangkit tenaga listrik. Penelitian ini bertujuan untuk mempelajari pengaruh debit aliran dan tinggi terjun air terhadap kecepatan putaran dan tenaga yang dihasilkan serta menetapkan efisien- si dari penggunaan turbin air sebagai pembangkit tenaga listrik pada lokasi penelitian. Perlakuan terdiri dari dua faktor, yaitu debit air "Q" dengan taraf masing-masing 40, 60, 80 dan 100 liter tiap detik serta tinggi terjun air "H" dengan taraf masing-masing 3,25; 3,35; 3,45 dan 3,55 meter. - Hasil penelitian menunjukkan bahwa jumlah putaran tiap menit roda transmisi turbin air, minimum 120 rpm dan maksimum 268 rpm, dengan masing-masing dicapai pada debit aliran Q 40 liter tiap detik dengan tinggi terjun air H 3,25 meter dan Q 100 liter tiap detik dengan Η = 3,55 meter. ...
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Judul: Pengaruh Variasi Sudut Kemiringan Bilah Terhadap Performa Turbin Angin Sumbu Tegak Dalam Terowongan Angin Sederhana
Abstrak: Penelitian ini bertujuan untuk mengetahui sudut kemiringan optimum (tilting angle θ) dari turbin angin sumbu tegak. Desain turbin angin ini termodifikasi dari model aerofoil NACA 6412. Performa turbin angin diuji dari 7 buah bilah dengan lima buah variasi sudut kemiringan yaitu 27̊, 30̊, 45̊, 60̊, dan 90̊. Kecepatan angin yang digunakan pada eksperimen ini dalam rentang 0-6 m/s. Performa pada turbin angin tersebut dievaluasi pada beberapa parameter yaitu daya angin, daya turbin, efisiensi turbin, torsi, dan Tip Speed Ratio (TSR). Hasil yang kami dapat bahwa turbin angin dengan sudut kemiringan bilah θ = 27º memiliki daya turbin yang paling efisien sebesar 50%.
Keyword: turbin angin sumbu tegak, sudut kemiringan bilah, daya keluaran, efisiensi turbin

Judul: Systematics of Desmos (Annonaceae) in Malesia
Abstrak: Desmos is a woody climbing genus of Annonaceae which has been widely used as traditional medicine in several countries such as China, Indo-China, Thailand, and Peninsular Malaysia to treat dysentery, vertigo, fever, and postpartum. Phylogenetic studies on Desmos showed a close relationship between Desmos and Dasymaschalon. They share similar moniliform monocarpic fruits, but their flowers are different. It has been debated among Annonaceae researchers whether both genera should be treated as the same or distinct genus. Therefore, investigation on the taxonomic delimitation of Desmos species and Dasymaschalon will be necessary. Plastid genome (plastome) identification, leaf epidermal section of Desmos species and Dasymaschalon species, a taxonomic revision of Desmos in Malesia using morphological data, the spatial distribution of Desmos species in Malesia, and morphological and genetic variation in Desmos chinensis population using ISSR marker were used to investigate taxonomic delimitation of Desmos. Plastome study of Desmos chinensis and Dasymaschalon dasymaschalum was carried out to determine the origin, evolution, phylogenomics, and identify marker candidates for Desmos and Dasymaschalon or with other genera in Annonaceae. We discovered that the plastome of Desmos chinensis was circular with the size of 167,677 bp (smaller than Dasymaschalon dasymaschalum), consist of 111 genes, including 78 protein-coding genes, 29 transfer RNAs, and 4 ribosomal RNAs. The plastome showed a typical quadripartite structure, i.e., large single copy (LSC), small single copy (SSC), and two inverted repeats (IRs). The plastome of Dasymaschalon dasymaschalum was 191,488 bp in length, which also exhibited a typical quadripartite structure (LSC, SSC, and two IRs). Desmos chinensis and Dasymaschalon dasymaschalum showed different copies of accD, ndhD, ndhF, rps18, and ycf2. Protein coding genes of rpoB, rpoC1, rbcL, matK, rpl32, infA, and rpl36 were identified based on nucleotide diversity, sequence variability, and parsimony-informative sites. The genes are defined as molecular marker candidates of plastome for phylogenetic, barcoding, and population genetic research. We predicted that Desmos chinensis and Dasymaschalon dasymaschalum separated at ca. 64 million years ago during the Paleocene. Leaf anatomical feature study was carried to support the taxonomic delimitation of interspecific Desmos and intergeneric of Desmos and Dasymaschalon. Leaf anatomy in the paradermal section of 20 taxa (12 species of Desmos, eight species of Dasymaschalon) have been carried out. According to the leaf epidermal section, Desmos and Dasymaschalon are two distinct genera mainly distinguished based on the anticlinal wall undulation of epidermal cells and supported by variation of the crystal type and size. The anticlinal wall undulation of Desmos was almost straight to slightly wavy and never sinuous; meanwhile, Dasymaschalon varies from almost straight to deeply sinusoid. The crystals of Desmos consist of rhombohedral, druse type A, and druse type B crystals, whereas Dasymaschalon has prism, druse type A, druse type B, and druse type C crystals. The recent taxonomic revision using the morphological data was mainly based on the examination of about 1374 specimens from BO, L, WAN, ANDA, SING, SAN, K, P, HUH herbaria. The Desmos species in Malesia consists of eight species: D. acutus, D. chinensis, D. chryseus, D. dunalii, D. pedunculosus, D. subbiglandulosus, two new records: D. lawii and D. macrocarpus, and one
Keyword: Dasymaschalon, Desmoid clade, Magnoliid, plastid genome, phylogenomics analysis