<p><strong><em>ABSTRACT</em></strong></p><p><em>Availability of water is a major factor in determining cropping patterns in irrigated rice fields. This study aims to develop a microcontroller-based automation concept that can later be applied to ensure the availability of irrigation water needed for plants. Th</em><em>e application designed was</em><em> an automatic irrigation system of paddy rice using a water pump irrigation method. This system consists of an Arduino as a data processor, Bluetooth, a smartphone and a water level sensor as a water detector. The software uses MIT App Inventor as a smartphone programming medium and Arduino IDE as a whole series programming. The pump will turn on when the on button on the smartphone and when the water has reached the height specified by the water level sensor, the water level sensor will decide the pump voltage.</em></p><p><strong>Keywords:</strong><em> Irrigation, Arduino, Bluetooth, MIT App Inventor</em></p><p> </p><p><strong>ABSTRAK</strong></p><p>Ketersediaan air merupakan faktor utama dalam penentuan pola tanam pada daerah pengairan padi sawah. Studi ini bertujuan untuk mengembangkan konsep otomasi berbasis mikrokontroler yang nantinya bisa diaplikasikan untuk menjamin ketersediaan air irigasi yang dibutuhkan untuk tanaman. Aplikasi yang dibuat berupa sistem otomatis pengairan padi sawah yang menggunakan metode irigasi pompa air. Sistem ini terdiri dari arduino sebagai pengolah data, bluetooth, <em>smartphone</em> dan sensor water level sebagai pendeteksi air. Perangkat lunaknya menggunakan MIT App Inventor sebagai media pemograman <em>smartphone</em> dan arduino IDE sebagai pemograman rangkaian keseluruhan. Pompa akan menyala apabila tombol on pada <em>smartphone </em>dan apabila air sudah mencapai ketinggian yang ditentukan sensor water level, maka sensor water level akan memutuskan tegangan pompa.</p><p><strong>Kata Kunci:</strong><em> Irigasi, Arduino, Bluetooth, MIT App Inventor. </em></p>
The water quality of the Batanghari River in Jambi Province has been categorized as polluted because it contains heavy metal contents, such as Pb, Mn, Cd, and Hg. One of the river biotas that become local people’s favorite and can accumulate heavy metals is Polymesoda erosa mussels. This research aimed to investigate and analyze the heavy metals contained in mussels in the Batanghari by using AAS and ICP methods. The results showed that the average content of lead metals (Pb) in Polymesoda erosa in Point A was 5.93 mg/kg while in Point B was 13.5 mg/kg. Mussels with such contents of Pb metal are not safe to consume because the contents exceed the threshold of SNI 7387:2009 with a maximum limit of Pb at 1.5 mg/kg. Meanwhile, the average content of manganese metal (Mn) in Polymesoda erosa in Point A was 89.24 mg/kg, while in Point B was 169.85 mg/kg. These numbers also exceed the standard threshold of manganese metal quality for fish by 20 mg/kg based on the Turkish Guideline. The average concentration of Cd metals and Hg metals in Polymesoda erosa in Point A was 0.04 mg/kg and 0.122 mg/kg, respectively; while in Point B was 0.05 mg/kg and 0.169 mg/kg, respectively. The concentrations of Cd and Hg metals do not exceed the threshold and are safe to consume. However, since Pb and Mn metals have exceeded the threshold and are not safe to consume, the Polymesoda erosa mussels in the Batanghari are still not safe to consume.
This research is related to the route of picking up the waste which done by janitors in housing complex of Aur Duri Indah Rt.14 Jambi considering the condition of that housing which have some crossroads, such that janitors take the same road twice which seems inefficient in terms of time and fuel consumption. This research is aimed to identify scientifically about the shortest and more efficient route which should be taken by janitors. This problem is considered as optimization problem through graph modelling. To check the efficient route, the existence of Hamiltonian Path of the graph is identified by using Depth-First Search method, and so is the shortest path. It is found that there are 39 Hamiltonian paths and the shortest path has total distance of 793.8 meter. By the existence of the shortest Hamiltonian Path, it is confirmed that janitors in housing complex of Aur Duri Indah Rt.14 can travel each road once with total distance is about 793.8 meter.
Penelitian ini diadakan berkaitan dengan mewabahnya penyakit Mers di kawasan Timur Tengah sejak 2012, bahkan hingga ke Korea pada 2015. WHO menyatakan bahwa hingga saat ini belum ada vaksin untuk mencegah manusia dari virus Mers sehingga masih ada kasus Mers baru yang dilaporkan dari beberapa negara. Oleh karena itu, pada artikel ini, dibentuk model matematika berbentuk persamaan reaksi difusi dan kinetik berupa sistem persamaan diferensial parsial (PDP) berkenaan dengan penyebaran virus Mers yang melibatkan tindakan karantina terhadap individu yang terinfeksi Mers. Kemudian keberadaan solusi traveling wave dari model tersebut diinvestigasi dan kecepatan penyebaran virusnya dianalisa. Berdasarkan model dan nilai parameter yang digunakan, diperoleh besaran basic reproduction number, = 2,2 yang menunjukkan bahwa Mers menjadi epidemi di populasi, dan diperoleh kecepatan minimum penyebaran Mers sebesar 2,09 km/hari. Melalui analisa sensitifitas kecepatan dan gelombang traveling wave, diperoleh kesimpulan bahwa untuk mengontrol laju penyebaran virus Mers, maka sangat perlu mengkarantina individu yang terindikasi virus Mers segera. Keberadaan solusi traveling wave dari model dapat ditunjukkan melalui simulasi numerik dengan metode FTCS (Forward Time Center Space).
The schedule for each course should be arranged such that the course taken by the same student or involving the same lecturer are not scheduled on the same day and time. This is to avoid conflicting schedules for students and lecturers. In the odd semester academic year 2021/2022, there were 23 courses scheduled at the study program of Mathematics, Universitas Jambi. The students in semesters 1 and 5 were divided into 2 classes, respectively, due to a large number of students in that semester. Therefore, the arrangement of the course schedule was getting more complicated. This research aimed to arrange the course schedule so that there is no clash by using the graph coloring approach. This research was classified as case study research and applied the descriptive method. The arrangement of the course schedule began with modeling the problem in the form of a graph and then using the Welch Powell algorithm to color the vertices in the graph. The graph consists of 36 vertices and 215 edges. By applying the Welch-Powell algorithm, the chromatic number obtained was 10, which means there are 10 optimum sessions or 10 minimum sessions of the course schedule in the odd semester in the Mathematics study program Universitas Jambi. Based on this result, the grouping of courses can be obtained that can be scheduled on the same day and at the same time.
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