1,720,972 research outputs found
Pola Perubahan Penggunaan Lahan Sub Sub Daerah Aliran Sungai (DAS) Cikujang
Full text linkAbstrak. Sub Sub DAS Cikujang merupakan salah satu bagian dari Sub DAS Cimanuk hulu yang dapat menyumbang sedimen ke waduk Jatigede yang berasal dari erosi sebagai akibat perubahan penggunaan lahan yang tidak sesuai dengan kondisi fisik lahan. Hasil kajian memperlihatkan pola perubahan penggunaan lahan di Sub Sub DAS Cikujang periode 1994-2009, terjadi perubahan penggunaan lahan dari kawasan lindung menjadi kawasan budidaya seluas 742,20 ha. Kawasan lindung pada tahun 1994 seluas 3.213,03 ha menurun menjadi 2.470,83 ha pada tahun 2009 dan kawasan budidaya pada tahun 1994 seluas 9.532,41 ha meningkat menjadi 10.274,61 ha pada tahun 2009 dengan laju perubahan 185,55 ha/tahun. Laju penurunan luasan hutan primer mencapai 54,45 ha/tahun, dan pada tahun 2009 tidak terdapat lagi lahan dengan fungsi sebagai hutan primer. Laju penurunan luasan hutan sekunder mencapai 135,90 ha/tahun dari 2.995,25 ha pada tahun 1994 menjadi 2.451,65 ha pada tahun 2009. Pola perubahan penggunaan lahan di Sub Sub DAS Cikujang sebagian besar dipengaruhi dengan pola perubahan hutan primer dan hutan sekunder pada kawasan lindung. Sedangkan pola perubahan penggunaan lahan pada kawasan budidaya dipengaruhi pola perubahan lahan kebun campuran, tegalan/ladang, perkebunan, dan sawah
Land-Use Change Pattern in Cikujang Catchment Area
Abstract. Cikujang catchment area is one part of the subzone Cimanuk that can contribute sediment upstream reservoirs to Jatigede derived from erosion as a result of changes in land use that is not in accordance with the physical condition of the land. Based on analysis result of land-use change pattern in Cikujang catchment area in 1994 – 2009 period, land-use had changed 742,20ha from protected areas to cultivated areas, where protected area had decreased from 3.213,03ha in 1994 to 2.470,83ha in 2009 and cultivated area had increased from 10.274,61 ha in 1994 to10.274,61 ha in 2009 with changing rate ha/year. The rate of decreasing primary forest area was 54.45ha/year, as a result there was no land function as primary forest in 2009. The rate of decreasing secondary forest area was 135,90ha/year ranging from 2.995,25ha in 1994 to 2.451,65ha in 2009. Land-use change pattern in Cikujang catchment area dominantly was influenced by changing pattern of protected forest and secondary forest in protected area, but in cultivated area land-use change pattern was influenced by changing pattern of farm, grassland, and rice field
Kajian Tingkat Laju Limpasan Permukaan dan Erosi Berdasarkan Pengelolaan Tanaman Pertanian Sistem Agroforestry di DAS CiantenCipancar, Provinsi Jawa Barat, Indonesia
Full text linkPeningkatan kawasan budidaya pada suatu Daerah Aliran Sungai (DAS) berimplikasi pada peningkatan laju limpasan dan erosi. Sistem agroforestry dapat menurunkan tingkat erosi melalui pengelolaan tanaman pertanian di bawah tegakan tanaman tahunan Jati putih (Gmelina arborea sp.). Penelitian ini bertujuan untuk mengkaji tingkat laju limpasan permukaan dan erosi yang terjadi di DAS pada beberapa jenis sistem tanam agroforestry. Di kawasan DAS Cianten-Cipancar terdapat beberapa tanaman yang dibudidaya petani yaitu jagung, kunyit, kacang merah dan cabe rawit lokal. Guna mengkaji tingkat laju limpasan permukaan dan erosi pada kawasan DAS tersebut maka didesain 3 plot percobaan yang melibatkan 4 jenis tanaman hortikultura. Plot 1 menggunakan pola tanam tumpangsari (kunyit, jagung, kacang merah, cabe rawit lokal). Plot 2 menggunakan pola tanam tumpangsari (kunyit, jagung, kacang merah). Plot 3 menggunakan pola tanam monokultur cabe rawit lokal. Hasil penelitian menunjukkan bahwa limpasan rata-rata pada masing-masing plot (1-3) adalah 0.28 mm, 0.55 mm, 0.94 mm pada tingkat curah hujan rata-rata 21.6 mm. Intensitas hujan pada masing-masing plot (63.4 mm/jam, 51.6 mm/jam, 63.4 mm/jam) menyebabkan terjadinya limpasan dan erosi masing-masing sebesar 0.83 mm, 29.67 kg/ha, 1.59 mm, 275.01 kg/ha, 5.0 mm, 464.78 kg/ha. Erosi rata-rata yang terjadi adalah 9.27 kg/ha (Plot 1), 55.65 kg/ha (Plot 2) dan 101.23 kg/ha (Plot 3). Jumlah kejadian hujan selama penelitian adalah 30 kali dengan total curah hujan 647.11 mm. Curah hujan terkecil sebesar 0.2 mm mengakibatkan limpasan pada Plot 3 sebesar 0.01 mm dan erosi 1.13 kg/ha namun pada Plot 1 dan Plot 2 tidak terjadi limpasan dan erosi
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
PENGARUH PEMBERIAN PUPUK KANDANG AYAM DAN PUPUK KCL TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN KACANG TANAH (Arachis hypogeal L.)
No full textPenelitian ini dilaksanakan di Kel Malunda, kec Malunda, Kab Majene, Sulawesi Barat pada bulan September 2020 sampai Desember 2020. Penelitian menggunakan RAK faktorial. F1 pemberian Pukan ayam, yaitu : 50g /tanaman, 100g /tanaman, 150g /tanaman. F2 pemberian pupuk KCL (K) yang terdiri dari 3 taraf yaitu : kontrol, pemberian pupuk KCL 5g/tanaman, dan pemberian pupuk KCL 10g / tanaman. hasil penelitian ini yaitu: hubungan antara pemberian Pukan ayam dengan pupuk KCL tidak berpengaruh pada semua peubah yang diamati. Pemberian pupuk kandang ayam juga tidak memberikan pengaruh baik pada semua peubah yang diamati. Pemberian pupuk KCL 10 g/tanaman (K2) memberikan pengaruh baik pada usia berbunga (hst), dan jumlahpolong
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Pengaruh Berbagai Macam Nilai EC (elektrical Condoktivity) Terhadap Pertumbuhan Tomat Ceri ( Lycopersicum Esculentum) Dengan Aplikasi Hidroponik Fertigasi Sistem DFT ( Deep Flow Technique)
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