1,720,974 research outputs found
Karakteristik Ekosistem Mangrove Di Kawasan Pesisir Kepulauan Natuna
No full textPenelitian ini bertujuan untuk mengetahui kondisi kualitas ekosistem mangrove di Pesisir Kepulauan Natuna melalui analisis sebaran jenis dan kerapatan mangrove. Ekosistem mangrove di Kawasan Pesisir ini memiliki tipologi Riverine Mangrove. Kondisi ekosistem mangrove baik. Jenis mangrove yang tumbuh meliputi Sonneratia alba, Rhizophora mucronata, Bruguiera gymnorhiza, Rhizophora stylosa,Ceriops tagal, Rhizophora apiculata.Xylocarpus granatum, Hibiscus, Casuariana, dan Pandanus. Kerapatan mangrove di pesisir kawasan ini tergolong padat sampai sangat padat dengan kisaran nilai kerapatan antara 1.000-2.933 idv/Ha. Kecamatan Bunguran Barat memiliki areal mangrove terluas dengan rataan kerapatan pohon yang tertinggi (1.833 idv/Ha). Ekosistem mangrove di Kepulauan Natuna rata-rata didominansi oleh Genus Rhizophora dengan jenis yang mendominasi antara lain Rhizophora mucronata, Rhizophora stylosa, dan Rhizophora apiculata. Kata kunci: ekosistem, kerapatan, mangrove</jats:p
PERTUMBUHAN BENIH IKAN LELE DUMBO (Clarias gariepinus) DENGAN PADAT PENEBARAN YANG BERBEDA PADA WADAH RESIRKULASI
Full text linkPenelitian ini dikerjakan di Laboratorium Teknologi Budidaya Perairan, Universitas Djuanda Bogor.Penelitian bertujuan untuk mengetahui pengaruh padat tebar terhadap pertumbuhan benih ikan LeleDumbo ( Clarias gariepinus) pada wadah resirkulasi. Desain yang digunakan adalah CompletelyRandomyzed Design (CDR) dengan 4 perlakuan dan 3 ulangan. Perlakuan yang diberikan adalahpadat tebar yang berbeda, yaitu padat tebar A (20 ekor /L), B (30 ekor/L), C (40 ekor/L), D (50ekor/L). Ikan dipelihara selama 30 hari dan diberi pakan buatan, frekuensi makan 2 kali sehari pukul08.00 dan 17.00 WIB secara ad libitum. Parameter yang diamati dan dianalisis yaitu tingkatpertumbuhan harian, meningkatkan panjang mutlak dan kualitas air sebagai pendukung. Hasilpenelitian menunjukkan bahwa laju pertumbuhan harian dan peningkatan panjang mutlak berbedasecara signifikan (P< 0.01) dan hasil dari BNT menunjukkan bahwa, hasil terbaik yang diberikanperlakuan A (20 ekor/L) diperoleh laju pertumbuhan harian 5.54 gram dan meningkatkan panjang2.13 cm, sedangkan perlakuan B (30 ekor/L), C (40 ekor/L) dan D (50 ekor/L) tidak terlihatsignifikan. Penggunaan sistem resirkulasi dapat menjaga kualitas air bahkan dengan meningkatnyakepadatan dari 20 ekor /L sampai 50 ekor /L. Kualitas air dari wadah resirkulasi layak untukpertumbuhan
PENGEMBANGAN MEDIA PEMBELAJARAN BOX CUACA PADA TEMA V KELAS III SD
Full text linkLatar belakang yang menjadi penelitian adanya pengembangan media merupakan faktor yang akan mempengaruhi proses pembelajaran dan mengajar sehinga lebih efektif dan menarik. Kemudian penelitian ini bertujuan utuk mengetahui kelayakan dan kepraktisan media pembelajaran Box Cuaca yang di kembangkan pada klas 3 SD Negeri 2 Kuranji.
Penelitian yang di lakukan oleh peneliti adalah penelitian pengembangan dengan menggunakan media box cuaca. Penelitian ini di lakukan SD Negeri 2 Kuranji, untuk mendapatkan hasil falidasi ahli media, materi dan respon peserta Didik. Dalam pengumpulan data yang dilakukan oleh peneliti menggunakan angket falidasi materi, media dan respon peserta didik.
Hasil peneloitian ini dapat di paparkan beberapa tahap langkah-langkah dengan menggunakan model ADDIE yang terdiri dari beberapa tahapan, yaitu : (1) Analysis; (2) Design; (3) Development; (4) Implementation; (5) Evaluation. Media pembelajaran Box Cuaca yang validadi oleh ahli media dan ahli matei yang di lakukan 2 Dosen dan 3 Guru pada validasi ahli materi denga perolehan presentase 88%, dengan kategori Sangat Valid. Ahli media dengan perolehan presentas 88,80%, dengan kategori Sangat Valid. Dan Respon peserta Didik pada uji kepraktisan media pembelajaran Box Cuaca dengan presentasa 82,30 dengan kategori Sangat Prakti
KELANGSUNGAN HIDUP dan PERTUMBUHAN BENIH IKAN LELE DUMBO (Clarias sp) PADA SISTEM RESIRKULASI DENGAN KEPADATAN BERBEDA
Full text linkThis study was aimed at assessing the effect of stocking density on the survival and growth of Dumbo fish fry raised in a recirculated system. The study was conducted at the the Laboratory of Aquaculture, Department of Aquaculture and Fishery Business and Chemistry Laboratory of the Faculty of Agribusiness and Food Technology, Djuanda University from May to September 2010.A completely randomized design with four treatments and three replications was used. Treatments consisted of stocking density rates of 20, 30, 40, and 50 fish/l. Tanks sized 50x30x30 cm3 were filled in with 25 liter water and fish fry sized 2.24-2.30 cm in the corresponding stocking density rates. Feeding was done ad libitum twice a day at 09.00 and 16.00. Parameters measured included survivability rate, body length growth, daily weight gain, feed efficiency, protein retention, and water quality.Results showed that stocking density gave significant effects (P<0.05) on survivability rate, body length growth, and daily weight gain but not (P>0.05) on feed efficiency and protein retention. The highest survivability rate, body length growth, and daily weight gain of 66.00%; 2.13 cm; and 5.54%, respectively, were obtained in stocking density of 20 fish/l. The quality of water used as a medium of catfish fry raising in each treatment during the experimental period was found to be within good range for the survival and growth of the fry. It was concluded that improving stocking density from 20 to 50 fish/l did not improve Dumbo catfish fry survival and growth rates. Meanwhile, the use of recirculated system was found to maintain medium water quality
Alternatif Perencanaan Struktur Penahan Tanah Dan Pondasi Di Apartemen The Arundaya Surabaya
Full text linkPT Kopel Lahan Andalan (Kopelland) bersama PT. Inti Teknik Solusi Cemerlang membangun sebuah apartemen bernama The Arundaya yang berada di Jln. Ir. Soekarno Kelurahan Mulyorejo, Kecamatan Mulyorejo, Surabaya, Jawa Timur. Lokasi pembangunan yang berada di kawasan padat penduduk menyebabkan pemanfaatan lahan menjadi terbatas. Untuk mengatasi keterbatasan lahan, maka direncanakan pembangunan basement 4 lantai yang difungsikan sebagai lahan parkir. Apartemen ini terdiri atas 3 tower dengan ketinggian masing-masing 43 lantai hunian dan 4 lantai podium serta memiliki 4 lantai basement. Hasil pengujian dari laboratorium menunjukkan bahwa kondisi tanah di proyek Apartemen The Arundaya dominan lempung berlanau hingga kedalaman ± 16 meter dengan nilai SPT adalah 4.
The Arundaya memiliki basement yang terdiri atas 4 lantai dan menggunakan struktur penahan tanah secant pile dengan kedalaman 28 meter. Pelaksanaan pada pembangunan proyek ini menggunakan metode botton-up. Selain itu, jenis pondasi yang digunakan adalah spun pile yang berdiameter 80 cm dengan kedalaman 30 meter. Pada saat ini, Apartemen The Arundaya masih belum terealisasikan.
Dari hasil perhitungan, diperoleh Diaphragma wall mempunyai tebal 1,2 meter dan dipasang hingga kedalaman -51,1
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meter. Struktur penahan ini menggunakan tulangan utama Ø25-250. Selain itu, pondasi menggunakan tipe Bored Pile berdiameter 80 cm yang mampu menanahan beban. Pondasi ini menggunakan tulangan 16D25 dengan rasio tulangan yaitu 1,623% dan Poer mempunyai dimensi 35,5 m x 60 m x 2 m. Pada proyek ini,pekerjaan galian diselesaikan dalam durasi 27 hari dengan menggunakan 9 unit Excavator dan 24 unit Dump Truck .
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PT Kopel Lalan Andalan (Kopelland) and PT. Inti Teknik Solusi Cemerlang are coorporate to built an apartment called The Arundaya that located on Ir. Soekarno Street, Kelurahan Mulyorejo, Kecamatan Mulyorejo, Surabaya City, East Java. The construction is located in overcrowded areas that cause limited of land use. To overcome the limited land, 4 floors basement is planned to be functioned as a parking lot. This apartment consists of 3 towers that has 43 residential floors, 4 podium floors, and 4 basement floors. The laboratory’s test results showed that the Arundaya Apartment project’s soil were dominant with silt clay that has ± 16 meters depth with an SPT value of 4.
The Arundaya has a 4 basement floors and uses a secant pile construction with 28 meters depth. This project construction uses the botton-up method. In addition, this project use spun pile as the foundation with a diameter of 80 cm and 30 meters depth. At this time, The Arundaya Apartment is not build yet.
From the calculation results, obtained Diaphragm wall has a thickness of 1 meter and installed to a depth of -51.1 meters. This retaining structure uses the main reinforcement Ø25-250. In addition, the foundation uses a type of 80 cm Bored Pile that is able to withstand loads. This foundation uses 16D25 reinforcement with a reinforcement ratio of 1.623% and Poer having size 35,5 m x 60 m x 2 m. In this project, excavation work can be completed in a
x
duration of 27 days using 9 units of Excavators and 24 units of Dump Trucks
Growth and Feed Efficiency of Gourami Fish Reared in Biofloc Media with Different C/N Ratios
Full text linkThe study was conducted to determine C/N ratio which gave the best growth, feed conversion ratio, feed efficiency, survivability, mortality rate, bacteria abundance and reduced nitrogen content in the production media of gourami fish. Treatments consisted of different C/N ratios including control, CN ratio 12, CN ratio 16, and CN ratio 20 in the production media. The trial was conducted in 45 days. Daily weight gain, feed conversion ratio, feed efficiency, survivability, mortality rate, abundance and types of bacteria, total ammonia-N (TAN), total nitrite, and total nitrate contents were evaluated. Results showed that different C/N ratios gave significant effects on feed conversion ratio, feed efficiency, survivability, and mortality rate, but not on daily weight gain. The best feed conversion ratio and feed efficiency was found in C/N ratio 12 while the best survivability and mortality rate were found in CN ratio 20. The bacteria spreading over the treatment groups were found to reduce from 11 types in the beginning of the trial period to only 8 types in the end of the trial period. In all treatment groups Micrococcus sp. was found in the beginning of the trial period while Bacillus sp. was found in the end of the trial period. Based on TAN, nitrate, and nitrite measurements, in production media with high C/N ratios, N content was found to be reduced and in the amount ranges that were good for fish growth even though no water changes were done.
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
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
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