Judul: Penerapan ukuran sasaran dan studi kualitas beberapa produk gergajian di penggergajian mesin KPH Randublatung Perum Perhutani Unit I Jawa Tengah
Abstrak: Tujuan penelitian ini adalah untuk mengetahui tingkat efisiensi penggunaan bahan baku industri penggergajian melalui penetapan ukuran sasaran. Di samping itu juga untuk mengetahui tingkat keterkendalian proses produksi yang berlangsung. Jika tidak terkendali maka dapat dicari penyebab penyimpangannya serta berupaya menghilangkan penyebab penyimpangan tersebut. Penelitian ini dilaksanakan di penggergajian mesin KPH Randublatung Perum Perhutani Unit I Jawa Tengah selama tiga puluh hari kerja...
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Judul: Studi produktivitas mesin dan ketepatn ukuran sortimen di penggergajian mesin Madiun Perum Perhutani Unit II Jawa Timur
Abstrak: Untuk memperoleh produktivitas yang maksimal dari suatu industri penggergajian, diperlukan kelancaran dan keseimbangan dalam proses produksinya. Hal ini dapat dicapai antara lain dengan pengaturan dan penggunaan mesin yang sesuai, baik dari mesin utama (headrig) maupun mesin- mesin pembantunya. Keseimbangan mesin-mesin produksi dapat dilihat dari lancar tidaknya aliran produksi pada tiap-tiap mesin atau unit pengolahan produksi tertentu. Selanjutnya untuk mengetahui keseimbangan mesin-mesin produksi tersebut, dilakukan penelitian tentang produk- tivitas mesin utama dan mesin-mesin pembantunya. Selain itu pengawsan kualitas juga perlu dilaksanakan dalam kegiatan industri penggergajian. Penyimpangan kualitas tersebut dapat mengakibatkan pemborosan bahan baku, penurunan harga produk akhir dan peningkatan biaya produksi per satuan tertentu. Kualitas kayu gergajian dapat dilihat dari ketepatan ukuran, keteraturan bentuk dan penampilan dari kayu gergajian yang dihasilkan (Padli- nurjaji, 1979). Penelitian ini bertujuan untuk mengetahui keseimbangan produktivitas antar mesin dan ketepatan ukuran sortimen di Industri Penggergajian Mesin Madiun, Perum Perhutani Unit II Jawa Timur. Penelitian produktivitas mesin-mesin penggergajian dilakukan dengan menggunakan satu mesin headrig, satu mesin resaw, satu edger, dan satu trimmer. Sedangkan untuk ketepatan ukuran diambil dari jenis sortimen finish. Flooring ukuran 1,60 cm x 9,70 cm block ukuran 1,80 cm x 5,20 cm.....
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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