Struktur Komunitas Biologi di Danau Pondok Lapan, Kabupaten Langkat Provinsi Sumatera Utara

Danau Pondok Lapan (DPL) adalah sebuah danau buatan yang terdapat di Kabupaten Langkat. Danau ini berfungsi sebagai sumber air, irigasi, resapan air tanah bagi masyarakat sekitar, pengendali banjir, dan kegiatan pemancingan ikan. Sampai saat ini data-data tentang danau tersebut sangatlah terbatas. Data-data terkait sumberdaya yang terdapat di danau sangat diperlukan untuk pengelolaan yang lebih tepat. Diantara beberapa data yang dimaksud adalah organisme penyusun danau. Penelitian ini bertujuan untuk mempelajari kondisi biologis DPL dengan melihat keragaman jenis dan struktur komunitas nekton, benthos dan plankton di perairan. Pengambilan sampel dilakukan pada bulan Februari - April 2015. Hasil pencacahan plankton di DPL ditemukan 52 jenis dari 10 kelas. Ada 6 kelas dari kelompok pitoplankton dan 4 kelas dari kelompok zooplankton. Jumlah genus paling banyak ditemukan jenis fitoplankton dan zooplankton masing-masing dari kelas Chlorophyceae berjumlah 18 genus dan dari kelas Cladocera sebesar 5 genus. Nekton yang ditemukan terdapat 2 kelas yaitu Actinopterygii dan Malacostrata.Terdapat 5 Ordo nekton yang ditemukan, yaitu 4 ordo dari jenis ikan dan 1 ordo dari jenis udang. Benthos yang ditemukan hanya 3 jenis dari kelas gastropoda, yaitu Bithynia tentaculata, Pomacea canaliculata dan Campeloma decisum. Struktur komunitas plankton, nekton dan benthos relatif tidak stabil serta ada kecenderungan didominansi oleh jenis tertentu.Pondok Lapan Lake (PLL) is an artificial lake located in Langkat regency. The lake its function as source of water, irrigation, catchment area, flood control, and fishing activities. Until recently data about this lake, are limited. The data related to the resource contained in the lake is very necessary for a more appropriate management. Among some of these data are organisms that inhabit the lake. This research aims to study the biological conditions of PLL to see the diversity and community structure of nekton, benthos and plankton. Sampling was conducted in February - April 2015. PLL enumeration results in the plankton found 52 species of 10 classes. There are 6 classes of groups pitoplankton and 4 classes of zooplankton groups. Nekton found there are 7 types of two classes, namely Actinopterygii and Malacostrata. Benthos found only 3 species of gastropod class, namely Bithynia tentaculata, Pomacea canaliculata and Campeloma decisum. Community structure benthos, nekton and plankton are relatively unstable and there is a trend happening dominance by a particular typ

Método de mando automático de una fábrica de cemento mediante un computador

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Modern Pre-School Education from the Standpoint of Self-Worth Childhood

Relevance of the studied problem is due to the reforming of the Russia education system that have begun in according to which the pre-school system is the first stage of general education and in this regard at the stage of practical implementation of reforms there is a risk of self-worth loss as the preschool period of development of the foundations of human culture in specific children’s activities. The purpose of the article is the theoretical justification of transition of childhood phenomenon from the information paradigm to the cultural-historical one, in refinement of “early childhood education” category in the context of the FSES, in disclosure of the idea of preschool self-worth. Leading approach to the theoretical justification of the author’s position is a cultural-historical system-activity approach. During the research process there are emerged number of important results: revealed and systematized the conditions for ensuring the childhood self-worth in the process of transformation of the system of preschool education into the stage of general education; was conducted the theoretical study of the need to preserve the specificity of preschool age as a basis for the formation of a full-fledged personality. Overall results of the study can help to solve the problem of formation the state educational policy aimed at improving the social status of preschool children, and may also be useful for developers of teaching materials of vocational and further education in the field of early childhood education

Pemanfaatan Media Ape Pkk Kelurahan Margohayu Kecamatan Karangawen Kabupaten Demak

PEMANFAATAN MEDIA APE PKK KELURAHAN MARGOHAYU KECAMATAN KARANGAWEN KABUPATEN DEMA

PENGARUH KEPEMILIKAN MANAJERIAL, KEPEMILIKAN INSTITUSIONAL, PROFITABILITAS DAN UKURAN PERUSAHAAN TERHADAP KEBIJAKAN DEVIDEN

Tujuan dari penelitian ini adalah untuk mengetahui faktor-faktor yang mepengaruhi Kebijakan Deviden (DPR). Faktor-faktor tersebut adalah Kepemilikan Manajerial (KM), Kepemilikan Institusional (KI), Profitabilitas (ROI) dan Ukuran Perusahaan (SZ). Data yang digunakan adalah data sekunder yaitu laporan keuangan tahunan pada Perusahaan Manufaktur. Pengambilan sampel pada penelitian ini menggunakan metode purposive sampling. Dengan metode ini, diperoleh 135 perusahaan yang dijadikan sebagai sampel penelitian. Metode analisis data yang digunakan adalah Analisis Deskriptif, Uji Asumsi Klasik, Analisis Regresi Linear Berganda dan Pengujian Hipotesis. Hasil penelitian menunjukkan bahwa Kepemilikan Manajerial, Kepemilikan Institusional,Profitabilitas tidak berpengaruh terhadap Kebijakan Deviden dan Ukuran Perusahaan berpengaruh terhadap Kebijakan Deviden.Kata kunci: Kepemillikan Manajerial (KM), Kepemilikan Institusional (KI), Profitabilitas (ROI) dan Ukuran Perusahaan (SZ) terhadap Kebijakan Dividen

Struktur komunitas biologi di Danau Pondok Lapan, Kabupaten Langkat Provinsi Sumatera Utara

Danau Pondok Lapan (DPL) adalah sebuah danau buatan yang terdapat di Kabupaten Langkat. Danau ini berfungsi sebagai sumber air, irigasi, resapan air tanah bagi masyarakat sekitar, pengendali banjir, dan kegiatan pemancingan ikan. Sampai saat ini data-data tentang danau tersebut sangatlah terbatas. Data-data terkait sumberdaya yang terdapat di danau sangat diperlukan untuk pengelolaan yang lebih tepat. Diantara beberapa data yang dimaksud adalah organisme penyusun danau. Penelitian ini bertujuan untuk mempelajari kondisi biologis DPL dengan melihat keragaman jenis dan struktur komunitas nekton, benthos dan plankton di perairan. Pengambilan sampel dilakukan pada bulan Februari - April 2015. Hasil pencacahan plankton di DPL ditemukan 52 jenis dari 10 kelas. Ada 6 kelas dari kelompok pitoplankton dan 4 kelas dari kelompok zooplankton. Jumlah genus paling banyak ditemukan jenis fitoplankton dan zooplankton masing-masing dari kelas Chlorophyceae berjumlah 18 genus dan dari kelas Cladocera sebesar 5 genus. Nekton yang ditemukan terdapat 2 kelas yaitu Actinopterygii dan Malacostrata.Terdapat 5 Ordo nekton yang ditemukan, yaitu 4 ordo dari jenis ikan dan 1 ordo dari jenis udang. Benthos yang ditemukan hanya 3 jenis dari kelas gastropoda, yaitu Bithynia tentaculata, Pomacea canaliculata dan Campeloma decisum. Struktur komunitas plankton, nekton dan benthos relatif tidak stabil serta ada kecenderungan didominansi oleh jenis tertentu.Pondok Lapan Lake (PLL) is an artificial lake located in Langkat regency. The lake its function as source of water, irrigation, catchment area, flood control, and fishing activities. Until recently data about this lake, are limited. The data related to the resource contained in the lake is very necessary for a more appropriate management. Among some of these data are organisms that inhabit the lake. This research aims to study the biological conditions of PLL to see the diversity and community structure of nekton, benthos and plankton. Sampling was conducted in February - April 2015. PLL enumeration results in the plankton found 52 species of 10 classes. There are 6 classes of groups pitoplankton and 4 classes of zooplankton groups. Nekton found there are 7 types of two classes, namely Actinopterygii and Malacostrata. Benthos found only 3 species of gastropod class, namely Bithynia tentaculata, Pomacea canaliculata and Campeloma decisum. Community structure benthos, nekton and plankton are relatively unstable and there is a trend happening dominance by a particular typ

Parametric analysis on a simple design water reaction turbine for low-head low-flow Pico-hydro generation system

This paper presents a parametric analysis of the outward flow reaction type turbine known as a Z-Blade turbine for low-head low-flow conditions. By applying the principles of mass conservation, momentum and energy, a nomogram was designed to investigate the theoretical performance characteristics. Based on the parametric analysis and the governing equations and experimental results, attempts have been made to prove that the mass flow rate, angular speed, centrifugal head, power output and efficiency respond dynamically to the water head, radius of the rotor, size of the PVC pipes and the nozzle exit area. A turbine with a 1” pipe diameter gives a higher performance compared to a 1/2” pipe diameter, and certainly the performances of both pipe sizes are improved when the supplied potential energy is increased. This innovative turbine has a maximum rotational speed at an optimum turbine diameter at 0.6m, accompanied by a point where there is a sudden reduction in the water flow rate, where previously the increment in the water flow rate was very high. This can shows from the outcome nomogram with 1” pipe diameter can perform 350 rpm speed with 1.48 L/sec water flow. The Z-Blade turbine has been examined and has shown good potential to be used for low-head (3m, 4m and 5m) and low-flow (less than 2.5 L/sec) conditions