Pemodelan Chemical Oxygen Demand (Cod) Sungai Di Surabaya Dengan Metode Mixed Geographically Weighted Regression

Chemical Oxygen Demand (COD) merupakan salah satu indikator pencemaran air secara kimia. Surabaya merupakan salah satu kota yang mengalami pencemaran sungai, dimana kondisi sungai di Surabaya memiliki keragaman struktur sehingga memungkinkan terjadinya perbedaan faktor yang berpengaruh pada COD. Untuk mengetahui faktor-faktor yang mempengaruhi COD sungai di Surabaya maka dilakukan pemodelan COD dengan Mixed Geographically Weighted Regression (MGWR), metode ini memungkinkan adanya variabel prediktor yang bersifat lokal dan global. Hasil MGWR dengan menggunakan fungsi kernel Fixed Bisquare menghasilkan variabel prediktor global yang signifikan adalah Nitrat, sedangkan variabel prediktor lokal yang signifikan adalah kecepatan aliran air dan Nitrit. Namun berdasarkan uji kesesuaian model MGWR, diperoleh kesimpulan bahwa tidak terdapat perbedaan yang signifikan antara model regresi global dan MGWR dengan R2 sebesar 58,43%. Sehingga pemodelan COD sungai di Surabaya dengan GWR akan memberikan hasil yang lebih baik dibandingkan MGWR, dimana dengan menggunakan GWR diperoleh hasil pemodelan terbaik dengan R2 sebesar 73,8% pada penggunaan fungsi kernel Adaptive Bisquare. Berdasarkan variabel yang signifikan pada model GWR di setiap lokasi diperoleh 9 kelompok, variabel yang signifikan adalah kecepatan aliran air, debit air sungai, Fosfat, Nitrat, Amonia, dan Nitrit

PRA Studi Kelayakan Potensi PLTM/PLTA Di Area PT. PJB Unit Pembangkit Brantas

In accordance with government policy to further optimize the utilization of renewable energy sources, and the policy of PT. PLN (Persero) to reduce the consumption of primary energy derived from fuel, then the PT Pembangkit Jawa-Bali (PT. PJB) plans to optimize the utilization of water resources in the Area PT. PJB Unit Pembangkitan Brantas that have the potential to be developed into minihyro power plants / hydro power plant with a capacity of under 10.0 MW. One purpose of this study is to anticipate the demand for electricity is increasing every year as well as to reduce dependence on primary energy derived from fossil tend thinning, as well as the concern of PT. PJB to environmental sustainability and clean development

Uji Dosis Tepung Buah Sirih Hutan (Piper Aduncum L.) Terhadap Mortalitas Hama Sitophilus Oryzae L. Pada Beras Di Penyimpanan

Research aims to obtain dose of spiked pepper fruit flour (Piper aduncum L.) better of mortality pests imago S. oryzae on the rice. Research conducted at the laboratory of Plant Pests, Faculty of Agriculture, University of Riau from May to June 2015. The Research was conducted experimentally by using completely randomized design (CRD), which consists of 5 treatments, where each treatments was repeated 4 times to obtain 20 units experiment. The treatment used in the research are (0 g/ 100 g, 2 g/ 100 g, 4 g/ 100 g, 6 g/ 100 g, 8 g/ 100 g of rice). Data obtained analyzed statistically using analysis of variance followed by least significant difference (LSD) at 5%. Dose applications of spiked pepper fruit flour at doses 6 g/ 100 g rice better of imago S. oryzae with lethal time50 24,5 hour and mortality by 97,5% inhibit the growth of the population, shrinkage weight of rice, and lethal dose 95 by 4,5%. Keywoards: Dose, insecticide, Piper aduncum L., Sitophilus oryzae, rice

Perangkat Pembacaan Data Analog Peralatan Industri Dengan Komunikasi Standard RS-485

Perekaman data-data parameter atau variabel di perangkat kendali jaring tertutup di industri dapat dilakukan dengan berbagai macam cara. Dengan menggunakan programmbale Logic controller (PLC), perekaman data-data parameter berbasis waktu telah dilakukan. Namun keterbatasan memori PLC mempersulit pembacaan dan meningkatkan biaya perekaman. Perekaman dngan pena bergerak di industri, juga sering ditemui. Kelemahan cara ini adalah pemborosan kertas dan pengamatan variabel yang cukup sulit, sehingga tumpukan kertas hasil rekaman semakin banyak dan semakin mempersulit dokumentasi proses kendali industri. Oleh karena itu diperlukan perangkat yang fleksibel dengan memori yang dapat diekspansi dengan biaya murah dan tanpa kertas. Paper ini menjelaskan desain perangkat perekam dengan menggunakan komputer PC untuk data-data di lapangan industri. Kata Kunci— Komunikasi data, kendali industri, mikrokontroller

Aplikasi Sistem Imformasi Geografis (SIG) untuk Pemetaan Pola Aliran Air Tanah di Kawasan Sukajadi Pekanbaru

Subdistrict of Sukajadi is one of populous subdistrict in Pekanbaru. Most of the resident use ground water as raw material to supporting necessaries of live everyday because water availability of PDAM is not yet good and less gratify . So that need an effort to taking care of availibility of resource irrigate with have monitoring system of ground water use which can be visualizinged in spasial data and its attribute. This research is intended to know the ground water flow model and availability potency of ground water in Sukajadi subdistrict area of Pekanbaru by using GIS (Geographic Information System). Measurement surveys were conducted twice with condition difference of rainfall, rain duration and sum up the dot measure. Its are measuring ground water surface elevastion of resident well therewith location co-ordinate. The results of data processing by computer base on GIS is contour mapping of ground water surface elevation by interpolation process using Spline method. Depiction of the ground water flow model in Sukajadi subdistrict area of Pekanbaru are conducted by drawing diametrical plump line with contour of ground water surface elevation. Generally stream lines of ground water are resulted moving to go to out of the system (Subdistrict of Sukajadi). Availability of ground water in this research location is depended to input from rainwater and recharge area remained