2,211 research outputs found

    Comparative study of some non-linear models for predicting the yield of Gmelina arborea plantation

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    Yield models are important for effective forest management and as such were developed for the University of Benin Gmelina arborea plantation, Nigeria. The objectives of the study were to develop, evaluate and compare predictions from some non-linear models for timber volume estimation. A total of nine non-linear models comprising of three models each for weibull, logistic and log-normal models were developed using the three independent variables combinations (Basal area and merchantable height, diameter at base and merchantable height, diameter at middle and merchantable height). The assessment criteria (correlation coefficient (R), coefficient of determination (R2), standard error of estimate (SE)) with the validation results (using percentage bias and probability plots of residuals) showed that all categories of weibull and logistic models generated in this study discovered to be very adequate for tree volume estimation. The highest R2 (93.80), lowest SE (0.25) and lowest bias% (1.29) in the study were achieved from Weibull model 1a. The log-normal models were the least adequate for tree volume estimation with the highest bias%. The one way analysis of variance revealed that there were no significant differences in the performance of the non-linear models when varying predictor variables were used. The weibull, logistic models were therefore recommended for further use in this ecosystem and in any other forest ecosystem with similar site condition

    The Impact of Peer Pressure Mathematical Models Armed Criminal Groups with Criminal Mapping Area

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    Model Armed Criminal Groups is mathematically realistic to be considered in the study of mathematical science. The aim of this research is to form a mathematical model of social cases of criminal acts. The given model is a criminal form that adopts the conformity of the conditions in the susceptible, exposed, infected, and recovered (SEIR) disease distribution model. The research method used is literature study and analysis. The research results show that there are 2 non-negative equilibrium, and one of them is stability analysis. Stability analysis is only carried out at equilibrium that does not contain a zero value with the Routh-Hurwitz criteria. In the results of other research the trajectories show that population growth tends not to experience fluctuations, this indicates that the population is growing towards stability rapidly. In case studies in the field, this marks a cycle of crime that quickly subsides or only occurs in a short period of time and does not occur in a sustainable manner. Overall the susceptible population, the exposed population, the infected population, and the recovered population experience the same conditions

    Ketaatan kapal pukat cincin yang berpangkalan di Pelabuhan Perikanan Samudera Bitung terhadap wilayah penangkapan ikan yang ditetapkan menggunakan data Vessel Monitoring System

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    There are many problems faced by the Indonesian government in managing the territorial waters of the country, and one of which is Illegal, Unreported and Unregulated Fishing (IUU Fishing). Therefore, the Indonesian government has begun to implement a Vessel Monitoring System (VMS) using satellites and equipment transmitter placed on fishing vessels in order to easily control and monitor the fishing vessel movements or activities based on the ship position observed on Fisheries Monitoring Centre. Top of Form This study was aimed to evaluate the compliance of purse seiners based on the VMS and to map the movements and activities of purse seiner during their fishing operations. This research was conducted at the Regional Monitoring Centre (RMC) room of Marine and Fisheries Resources Monitoring Base in Bitung from January to March 2016 using a descriptive method. The number of vessels observed in this study was 7. The data analysis of Tracking VMS based on Regional Fisheries Management of the Republic of Indonesia (WPP NRI) showed that 87% purse seiner did not obey the rules of fishing ground establishment. Nevertheless, based on Sea Map issued by the Department of Navy Hydro Oceanography commonly used by fishermen, all the boat skippers did not break the rules. Keywords: Purse seiner, obedience, vessel monitoring system ABSTRAK Banyak masalah yang dihadapi pemerintah Indonesia dalam mengelola wilayah perairan negara, dan salah satunya adalah masalah Illegal, Unreported and Unregulated Fishing (IUU Fishing). Oleh karena itu, Pemerintah Indonesia mulai menerapkan Vessel Monitoring System (VMS) yang menggunakan satelit dan peralatan transmitter yang ditempatkan pada kapal perikanan guna mempermudah pengawasan dan pemantauan terhadap pergerakan atau aktifitas kapal ikan, berdasarkan posisi kapal yang terpantau di Pusat Pemantauan Kapal Perikanan. Penelitian ini bertujuan untuk mengevaluasi kepatuhan kapal pukat cincin berdasarkan VMS; dan memetakan pergerakan dan aktifitas kapal pukat cincin selama beroperasi di laut. Penelitian ini dilakukan di ruangan Regional Monitoring Centre (RMC) Pangkalan Pengawasan Sumberdaya Kelautan dan Perikanan Bitung selama bulan JanuariĀ  sampai Maret 2016 dan dikerjakan dengan metode deskriptif. Jumlah kapal yang diamati dalam penelitian ini adalah 7 buah. Ā Hasil analisis data VMS berdasarkan Wilayah Pengelolaan Perikanan Negara Republik Indonesia (WPP NRI), maka 87% kapal pukat cincin tidak taat terhadap aturan mengenai wilayah penangkapan. Namun demikian, berdasarkan Peta Laut terbitan Dinas Hidro Oseanografi TNI-AL yang lazim dipakai oleh nelayan, semua nakhoda kapal pukat cincin tidak melanggar peraturan mengenai wilayah penangkapan. Kata-kata kunci: Kapal pukat cincin, ketaatan, vessel monitoring syste

    PERANCANGAN UNIT SEPARATOR HINGE LID PACKER MACHINE PT DJITOE MESINDO BATAM

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    Hinge Lid Packer (HLP) 2 adalah mesin yang berfungsi  mengemas batangan rokok. Pada tahap quality control, material input berups material uji coba (Ciggarette Tow). Pemisahan material uji coba dari kemasan rokok saat quality control perlu dilakukan dikarenakan material uji coba yang terbatas. Material uji coba yang telah dipisahkan dari kemasan rokok digunakan kembali dengan tujuan proses quality control dapat terus berjalan sampai fungsi dan standar yang diingingkan dari mesin tercapai. Proses pemisahan material uji coba dari kemasan rokok masih dilakukan secara manual oleh setter mesin HLP 2 dan operator.. Penelitian yang dilakukan adalah dengan membuat dan menghasilkan rancangan unit separator yang berfungsi untuk memudahkan dan mempercepat proses pemisahan material uji coba dari kemasan rokok. Unit separator dapat menggantikan tenaga manusia yang digunakan untuk pemisahan secara manual dengan tenaga mesin secara otomatis, dengan waktu 1,9 kali lebih cepat. Unit separator dapat mengurangi pekerjaan setter mesin, sehingga dapat melakukan quality control pada mesin HLP 2 dengan maksimal

    Analisis Implementasi Kurikulum Merdeka (Studi Kasus SMK Al Huda Kedungwungu Indramayu)

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    Penelitian ini dilatarbelakangi oleh pentingnya implementasi kurikulum merdeka di Sekolah Menengah Kejuruan (SMK). Penelitian ini bertujuan untuk mengetahui  1) implementasi kurikulum merdeka di SMK Al Huda Kedungwungu Indramayu, 2) kendala implementasi kurikulum merdeka di SMK Al Huda Kedungwungu Indramayu, dan 3) upaya untuk mengatasi kendala-kendala dalam implementasi kurikulum merdeka di SMK Al Huda Kedungwungu Indramayu. Tempat Penelitian ini adalah SMK Al Huda Kedungwungu Indramayu. Metode penelitian ini adalah deskriptif kualitatif dengan pendekatan studi kasus. Teknik pengumpulan data menggunakan wawancara, observasi dan dokumentasi. Teknik analisis data menggunakan analisis interaktif Miles dan Huberman meliputi reduksi data, display data dan penarikan kesimpulan. Hasil penelitian ini menunjukan 1) Implementasi kurikulum merdeka belajar di SMK Al Huda Kedungwungu Indramayu melalui tahapan input, proses dan output, 2) kendala-kendala implementasi kurikulum merdeka yaitu perlunya peningkatan kompetensi guru, sarana dan prasarana pendukung pembelajaran perlu ditingkatkan, perlunya menciptakan suasana pembelajaran efektif sesuai dengan keadaan industri, dan 3) upaya mengatasi kendala implementasi kurikulum merdeka yaitu meningkatkan kompetensi guru, menjalin kerjasama dengan pihak industri untuk, pengembangan metode pembelajaran yang menciptakan suasana kerja di industr

    Pengaruh Kinerja Keuangan Terhadap Return Saham Pada Perusahaan Pertambangan Yang Terdaftar Di Bursa Efek Indonesia

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    The research is aimed to analyze the influences of financial performance to the company stocks return. The sample is mining companies listed in the Indonesia Stock Exchange in 2013. The study concluded that at the significant level (Ī±) of 5%, there are no significant influences between DER (Debt to Equity Ratio), REO (Return on Equity), EPS (Earning Per Share), PER (Price Earning Ratio) and NPM (Net Profit Margin) to the stocks return. The results are related to the decrease of mining commodities in International market since 2012, the government\u27s plans to implement a rule banning the export of low-calorie coal, the drastic decline of exchange rate of rupiah against US dollar, the trade deficit in 2013 and world market conditions which make Indonesian exports declined
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