1,720,964 research outputs found
Pengaruh pemberian berbagai jenis keong terhadap pertumbuhan dan kelangsungan hidup ikan patin (Pangasius pangasius)
Full text linkAbstrakIkan Patin (Pangasius pangasius) merupakan ikan air tawar yang memiliki nilai ekonomis yang tinggi. Untuk membantu mempercepat pertumbuhan selain dengan menggunakan pellet, ikan patin juga dapat diberikan pakan alami seperti keong mas (Pomacea canaliculata Lamarck), bekicot (Achatina fulica) dan siput air tawar (Lemnaea javanica). Penelitian ini bertujuan untuk mengetahui pengaruh pemberian pakan jenis keong-keongan yang berbeda terhadap pertumbuhan, kelangsungan hidup, dan konversi pakan. Hasil penelitian menunjukkan bahwa pertumbuhan terbaik terdapat pada perlakuan A, yaitu dengan pemberian keong mas. terbaik kedua pada perlakuan B (pemberian bekicot) dan yang paling rendah pada perlakuan C (pemberian keong air tawar). Selanjutnya untuk tingkat kelangsungan hidup terbaik terdapat pada perlakuan A dan B yaitu sebesar 95.24%, dan yang terendah perlakuan C sebesar 90.47%. Rasio konversi pakan pada perlakuan A yaitu 3.45, sedangkan pada perlakuan C sebesar 7.44.Kata kunci: ikan patin; keong mas; bekicot, siput air tawar; pertumbuhanAbstractPangasius catfish (Pangasius pangasius) is a freshwater fish that has high economic value. To accelerate growth in addition by using pellet, this catfish can also be given live food such as the golden snail (Pomacea canaliculata Lamarck), edible snail (Achatina fulica), and freshwater snail (Lemnaea javanica). This study aims to determine the effect of different types of snail feeding on growth, survival rate, and feed conversion ratio. The results showed that the best growth was found in treatment A, by giving the golden snail, the second best growth in treatment B (by giving edible snail) and the lowest growth in treatment C (by giving freshwater snail). Furthermore, the best survival rate is in treatment A and B which is equal to 95.24%, and the lowest in treatment C (90.47%). Feed conversion ratio in treatment A was 3.45, while in treatment C was 7.44.Keywords: Pangasius catfish; The golden snail; edible snail; freshwater snail; growt
KORELASI KEMAMPUAN PENYELESAIAN SOAL-SOAL FISIKA DENGAN KEMAMPUAN NUMERIK SISWA MAN 2 ACEH BARAT
Full text linkPenelitian ini dilatarbelakangi oleh sebagian besar peserta didik kemampuan numeriknya rendah, maka efeknya tingkat kemampuan penyelesaian soal Fisika juga rendah. Tujuan penelitian ini yaitu (1) menganalisis kemampuan numerik siswa kelas XI MIA1 MAN 2 Aceh Barat, (2) menganalisis kemampuan penyelesaian soal-soal Fisika siswa pada materi Getaran Harmonis, serta (3) menganalisis hubungan kemampuan numerik dengan kemampuan penyelesaian soal-soal Fisika pada materi Getaran Harmonis. Penelitian ini merupakan jenis penelitian korelasional bersifat ex post facto, dengan menggunakan desain studi hubungan dan sampel dalam penelitian ini yaitu kelas XI MIA1 MAN 2 Aceh Barat dengan teknik pengambilan sampel yaitu simple random samping. Instrumen yang digunakan yaitu soal Tes Numerik dan soal Tes Fisika materi Getaran Harmonis. Teknik pengumpulan data dengan metode tes yaitu Tes Kemampuan Numerik dan Tes Kemampuan Penyelesaian Soal Fisika. Hasil penelitian menunjukkan bahwa: Sebagian besar kemampuan numerik siswa termasuk kategori sangat kurang (rentang nilai 0-49), sedangkan kemampuan penyelesaian soal termasuk kategori sangat rendah (rentang nilai 0-54), dan diperoleh koefisien korelasi dengan nilai rhitung = 0,958 dan rtabel = 0,3515, sehingga nilai rhitung rtabel artinya terdapat hubungan yang signifikan antara kemampuan numerik dengan kemampuan penyelesaian soal Fisika pada konsep Getaran Harmonis kelas XI MIA1 MAN 2 Aceh Barat
Analysis of excess nitrogen in feeding in the Floating Net Cage in Laut Tawar Lake, Central Aceh
No full textFloating net cage activities produce waste in the form of uneaten feed and metabolic waste that contain nitrogen and phosphorus, which can promote excessive growth of phytoplankton, leading to eutrophication. This research analyzes the excess nitrogen in feed provision in the floating net cage at Laut Tawar Lake. The difference in the amount of N in the feed and the amount of N in the fish represents the amount of N as the excess N in floating net cage activities. Feed samples of 7 different types and fish samples were randomly taken from 3 floating net cage locations, namely One-one, Toweren, and Kebayakan. Based on the results, the average N concentration in the feed used was 6.79% for tilapia and 6.71% for carp. The average N concentration in the tilapia is 7.71±0.61% and in the carp samples is 6.42±1.67%. The tilapia farming contributed N to the waters at a rate of 0.85 kg/m2 over a 4-month, while the carp floating net cage contributed N at a rate of 0.72 kg/m2 over a 5-month. The results indicate that floating net cage activities in Laut Tawar Lake produce N waste to the lake waters amounting to 0.36 kg/m2/month or 11.94 grams/m2/day.Floating net cage activities produce waste in the form of uneaten feed and metabolic waste that contain nitrogen and phosphorus, which can promote excessive growth of phytoplankton, leading to eutrophication. This research analyzes the excess nitrogen in feed provision in the floating net cage at Laut Tawar Lake. The difference in the amount of N in the feed and the amount of N in the fish represents the amount of N as the excess N in floating net cage activities. Feed samples of 7 different types and fish samples were randomly taken from 3 floating net cage locations, namely One-one, Toweren, and Kebayakan. Based on the results, the average N concentration in the feed used was 6.79% for tilapia and 6.71% for carp. The average N concentration in the tilapia is 7.71±0.61% and in the carp samples is 6.42±1.67%. The tilapia farming contributed N to the waters at a rate of 0.85 kg/m2 over a 4-month, while the carp floating net cage contributed N at a rate of 0.72 kg/m2 over a 5-month. The results indicate that floating net cage activities in Laut Tawar Lake produce N waste to the lake waters amounting to 0.36 kg/m2/month or 11.94 grams/m2/day
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
Application of liquid organic fertilizer from wild banana stem waste (Musa acuminate) and coconut husk as a culture medium for Spirulina platensis
Full text linkMicroalgae are single-celled microorganisms with pigments and can produce photosynthesis to produce food and oxygen. The addition of liquid organic fertilizer from wild banana stem waste (Musa acuminata) and coconut husk as a source of nutrients can be used to increase the cell density of Spirulina platensis. This research was conducted on September 18-27 at the Hatchery and Aquaculture Technology Laboratory, Aquaculture Study Program, Department of Fisheries and Marine, Faculty of Agriculture, Malikussaleh University. The method used in this study is an experimental method with a non-factorial Complete Randomized Design (RAL) of 5 treatments and 3 repeats. The study is treatment A Control (Walne fertilizer), treatment B (Mixture of POC Waste of forest banana stems and coconut husk 12 ml / L of sea water), treatment C (Mixture of POC Waste of forest banana stems and coconut husk 14 ml / L of seawater), treatment D (Mixture of POC Waste of forest banana stems and coconut husk 16 ml / L of seawater), treatment E (Mixture of POC Forest banana stem waste and coconut husk 18 ml/L seawater). The results of this study showed that the use of POC from forest banana stem waste and coconut husk as a culture medium for Spirulina platensis had a real effect with F calculate 43,850 > F tabel (0.05) 3.48 to the peak population and had a real effect on the growth rate of Spirulina platensis with F calculate (26,884) > F table (0.05) 3.48.Keywords: Coconut husk; POC; Spirulina platensis; Wild banana stem waste
Produksi Biomassa Chlorella Sp Untuk Bahan Baku Biodiesel Menggunakan Media Modifikasi Limbah Industri Kecap
Full text linkChlorellaspmerupakanalgaberseltunggaldarigolonganalgahijau Chloropyta) yang bisa menghasilkan minyak dan berpotensi sebagai bahan baku biodiesel. Chlorella sp memiliki keunggulan antara lain memiliki tingkat reproduksi yang tinggi, pertumbuhan sel cepat dan tidak memerlukan pretreatmen dalam pengolahannya. KultivasiChlorellaspselamainidikulturmenggunakanmedia pupuk walne dengan harga yang mahal. Oleh karena itu, untuk mengurangipenggunaan pupuk walne dan mengurangi biaya produksinya dapatdilakukanmodifikasi media kultur Chlorella sp. Penelitian ini bertujuan untuk mengetahuipengaruh modifikasi media kultur Chlorella sp dengan pemanfaatan limbah cairkecappadaskalalaboratorium.Metode yangdigunakanpadapenelitianiniadalaheksperimentaldenganmenggunakanRancanganAcakLengkap(RAL)NonFaktorial.Faktorperlakuandalampenelitian ini adalah perbedaan dosis modifikasi media limbah cair industri kecap.Adapun perlakuan terdiri atas 4 perlakuan 3 kali ulangan yaituA (kontrol), B(25% limbah cair industri kecap+75% media walne), C (30% limbah cair industrikecap+70% media walne), D (35% limbah cair industri kecap+65% media walne).Berdasarkan hasil uji F (ANOVA) menunjukkan bahwa perbedaan konsentrasimodifikasi media limbah cair industri kecap berpengaruh nyata terhadap biomassa Chlorella sp. Kombinasi media yang direkomendasikan dalam penelitian ini adalah perlakuan B (25 % Limbah+75% media walne
Penggunaan Triptofan dalam Pakan untuk Menurunkan Kanibalisme Ikan Kakap Putih (Lates calcarifer)
Full text linkWhite snapper (Lates calcarifer) is one of the leading marineculture commodities in Indonesia, snapper has a relatively faster growth and has high economic value. One of the factors that cause failure in snapper cultivation in Indonesia is the high level of cannibalism in fish fry. The purpose of this study was the addition of tryptophan to feed whether it affected the level of cannibalism, growth and survival of white snapper. This study used a non-factorial completely randomized design (CRD) method consisting of 4 treatments and 3 replications. The treatments used were Treatment A (control), B (Tryptophan 1%/kg feed), C (Tryptophan 1.5 %/kg feed), D (Tryptophan 2%/kg feed. The lowest cannibalism of snapper was found in treatment B (Tryptophan 1%/kg of feed) with a cannibalism rate of 35.7% and a survival rate of 56.67%
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