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REKAYASA
Published by Universitas Trunojoyo Madura
ISSN : 02169495     EISSN : 25025325     DOI : https://doi.org/10.21107/rekayasa
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics
This journal encompasses original research articles, review articles, and short communications, including: Science and Technology, In the the next year publication, Rekayasa will publish in two times issues: April and Oktober.
Arjuna Subject : -
Articles 504 Documents
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Penapisan antibakteri pada Bakteri Simbion Sinularia sp terhadap Escherichia coli Kartika, Ary Giri Dwi
Rekayasa Vol 10, No 2: Oktober 2017
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.697 KB) | DOI: 10.21107/rekayasa.v10i2.3609

Abstract

karang lunak) memiliki metabolit sekunder dengan konsentrasi yang rendah (10-6% dari berat basa invertebrata). Oleh karena itu dibutuhkan cara yang lebih konservatif dalam pemanfaatan metabolit sekunder untuk menjaga keseimbangan ekosistem.Tujuan dari penelitian ini adalah mengisolasi bakterisimbion Sinularia sp dan melakukan penapisan aktivitas antibakteri terhadap Escherichia coli. Isolasi bakteri simbion Sinularia sp dilakukan dengan menggunakan metode pengenceran dan sebar (spread). Purifikasi bakteri menggunakan metode streak, kemudian, uji antibakteri dilakukan dengan menggunakan metode overlay dan difusi agar. Sebanyak 5 isolat bakteri didapatkan dari hasil isoasi sampel. Hasil uji aktivitas antibakteri menunjukkan sebanyak 4 isolat (Isolat L2.2, L2.3, L2.4, dan L2.5) memiliki aktivitas antibakteri terhadap bakteri Escherichia coli. Isolat L2.5 memiliki diameter zona hambat terbesar yaitu sebesar 2,207 ± 0,401 cm.Kata Kunci: Sinularia sp, Antibakteri, Escherichia coli, Gili Labak.Skrinning Antibacterial from Sinularia sp Symbiont Bacteria Againts Escherichia coliABSTRACTSeveral studies have shown that invertebrates (including soft corals) contain secondary metabolites in low concentration (10-6% by wet weight of invertebrate). Therefore a more conservative approach is needed in the utilization of secondary metabolites to maintain the balance of ecosystems. The purposes of this study was to isolate the bacterium Sinularia sp and to screen antibacterial activity against Escherichia coli. Isolation of the bacteria symbione of Sinularia sp was performed by dilution method and spread. Purification of bacteria was performed by streak metho then, antibacterial test was done by using overlay method and agar disk-diffusion. A total of 5 bacterial isolates were obtained from the result of the isoation of the sample. The result of antibacterial activity test showed 4 isolates (Isolates L2.2, L2.3, L2.4, and L2.5) had antibacterial activity against Escherichia coli. Isolates L2.5 has the largest inhibitory zone diameter of 2.207 ± 0.401 cm.Keywords: Sinularia sp, Antibactery, Escherichia coli, Gili Labak.
Dampak Pemutihan Karang Keras pada Komunitas Ikan Karang dan Makrozoobenthos di Wilayah Perairan Tejakula, Buleleng, Bali Faiqoh, Elok; Karang, I Wayan Gede Astawa; Wiyanto, Dwi Budi
Rekayasa Vol 12, No 1: April 2019
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.274 KB) | DOI: 10.21107/rekayasa.v12i1.5290

Abstract

ABSTRAKPemutihan karang merupakan salah satu dampak dari perubahan iklim global, kenaikan suhu tersebut memberikan dampak negatif bagi keseimbangan ekosistem terumbu karang. ­Terumbu karang yang memutih dan kehilangan zooxanthella nya akan rentan terkena infeksi dan penyakit. Populasi komunitas ikan karang pemakan hewan karang dan makrozoobenthos juga akan menurun. Tujuan dari penelitian ini adalah untuk mengetahui besar dampak kerusa­kan terumbu karang dan dampaknya bagi populasi ikan dan makrozoobenthos. Survey dilakukan pada 3 titik di wilayah perairan Tejakula dengan metode reefcheck. Hasil penelitian menunjukkan kematian terumbu karang sebesar 5-7.5%, jumlah alga yang menutupi 3.125%. Kondisi ikan kepe-kepe yang merupakan pemakan hewan karang juga sudah ditemukan dalam jumlah cukup banyak. Keberadaan ikan herbivora dan makrozoobenthos herbivore membantu mengurangi jumlah alga yang menutupi. Sedangkan keberadaan ikan pemakan terumbu karang dan ikan predator memperlihatkan bahwa sistem ekologi yang ada di terumbu karang tersebut hampir kembali normal. Kata Kunci: terumbu karang, komunitas ikan karang, makrozoobenthos.The Impact of Hard Coral Bleaching in Coral and Macrozoobenthos Fish Communities in Tejakula, Buleleng, Bali Water AreasABSTRACTCoral bleaching is one of the consequences of global climate change, as the rise of temperature negatively impacts the ecological balance of reef ecosystems. Bleached coral reefs lose their zooxanthellae, increasing vulnerability to infection and disease and consequently, causing population decline of macrozoobenthos and reef fish communities which prey on coral-consuming organisms. This research aims to determine the degree of coral reef damage and its impact on fish and macrozoobenthos population. The survey was conducted on 3 stations in Tejakula waters with the reef check method. Results show that coral reef death reaches 5-7.5%, with algal coverage of 3.125%. Kepe-kepe fish which prey on coral-consuming animals were also found in relatively high abundance. The presence of herbivore fish and macrozoobenthos help reduce algal cover. Meanwhile, the presence of coral-consuming and predator fish indicate that the coral reef ecological system has mostly returned to normal. Keywords: coral reef, reef fish community, macrozoobenthos
KONSTANTA ELASTIK PADA POROSITAS HIDROKARBON BATUGAMPING DENGAN KONVERSI DINAMIK KE STATIK Ahied, Mochammad
Rekayasa Vol 7, No 1: April 2014
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.826 KB) | DOI: 10.21107/rys.v7i1.2084

Abstract

Pengukuran dinamik untuk mendapatkan konstanta elastik dihubungkan dengan besaran petrofisika utamanya porositas dan saturasi air sangat penting untuk penerapan penyebaran adanya reservoar. Sedangkan pengukuran statik biasanya dilakukan juga di dunia Migas untuk mendapatkan parameter mekanika batuan seperti, modulus Young, modulus onggok (bulk) dan nisbah Poisson, sehingga perlu dilakukan mendapatkan hubungan keduanya untuk mendapatkan secara langsung. Dari pengukuran dinamik dan statik dibuat model hubungan konstanta elastik seperti, modulus Young (E), modulus bulk (K), dan nisbah Poisson dengan porositas terhadap batugamping yang tersaturasi secara penuh (Sw = 100%). Sehingga dengan diketahuinya satu konstanta elastik dari pengukuran dinamik saja, maka dapat ditentukan pula semua konstanta elastik pada pengukuran statik tanpa mengukurnya. Dynamic measurements to obstain the elastic constants associated with values of petrophysics especially porosity and water saturation is very important for applying the spread of the reservoir. While  static measurements are usually done well in world oil and gas to get the parameter rock mechanics such as, young modulus (E), modulus bulk (K) and poisson ratio (ν), so we need both relationship. From dynamic and static measurements are made of constants elastic the relationship model such as, young modulus (E), modulus bulk (K) and poisson ratio (ν) the porosity of limestone which are fully saturated by water (Sw = 100%). So that, it  new one the measurements of dynamic elastic constants only, it can be determined also all on the measurements of static elastic constants without measuring it.
PERANCANGAN SOFTWARE PROCESS IMPROVEMENT PADA ORGANISASI PENGEMBANG USAHA KECIL Alfita, Riza
Rekayasa Vol 4, No 2: Oktober 2011
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (184.6 KB) | DOI: 10.21107/rys.v4i2.2342

Abstract

Setiap organisasi pengembang perangkat lunak harus tumbuh dan memperbaiki diri, salah satunya adalah dengan melakukan process improvement, jika perusahaan tidak melakukan hal tersebut maka perusahaan tidak akan pernah belajar memanfaatkan pengalaman sebelumnya, sehingga tidak bisa meningkatkan kualitas hasil proses yang ada. Software Process Improvement dapat dilakukan dengan mangacu pada CMMI (Capability Maturity Model Integration) yang dibuat oleh SEI (Software Engineering Institute). SEI adalah sebuah pusat penelitian di bidang software engineering terutama yang berkaitan dengan acquisition, architecture product lines, dan process improvement. CMMI mendefinisikan beberapa level maturity, untuk naik ke level yang lebih tinggi sejumlah proses harus dilakukan dan disesuaikan dengan kebutuhan. Kata kunci: software engineering, software process improvement, capability maturity model integration. AbstractAny organizations software developers must grow and improve themselves, one of which is to conduct process improvement, if the company does not do so then the company will never learn to take advantage of previous experience, so it can not improve the quality of existing processes. Software Process Improvement can be done with mangacu at CMMI (Capability Maturity Model Integration) are made by the SEI (Software Engineering Institute). SEI is a research center in the field of software engineering, especially with regard to acquisition, architecture product lines, and process improvement. CMMI defines some level of maturity, to rise to a higher level and a process should be carried out as needed. Key words: software engineering, software process improvement, capability maturity model of integration
Analisis Faktor-Faktor Pemilihan Lokasi Markas Komando Terhadap Keberhasilan Teritorial Pada Suatu Wilayah Teritori X Costa, Frejohn da; Widyoutomo, Antonius
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.10999

Abstract

Markas Komando adalah sebuah tempat yang digunakan sebagai tempat kedudukan pemimpin tentara (pandu, badan perjuangan) untuk memberi perintah, memimpin suatu pasukan. Penulisan  ini dimaksudkan untuk mengidentifikasi dan menganalisis faktor-faktor pemilihan lokasi Markas Komando terhadap keberhasilan teritorial pada suatu daerah teritori X. Secara khusus menganalisis apakah terdapat dampak signifikan antara faktor kedekatan infrastruktur (X1), lingkungan pemerintah daerah (X2) dan anggaran terhadap keberhasilan teritorial (X3). Metode analisis data penelitian ini merupakan analisis regresi linier berganda. Hasil penelitian menunjukkan bahwa kedekatan dengan infrastruktur, lingkungan pemerintah daerah, dan alokasi anggaran berpengaruh signifikan terhadap keberhasilan Markas Komando (Y = 0,145 + 0,327X2 + 0,272X1 + 0,398X3). Berdasarkan hasil uji t, variabel kedekatan dengan infrastruktur berpengaruh signifikan terhadap keberhasilan markas komando.
Stress Distribution Analysis of DKDT Tubular Joint in a Minimum Offshore Structure Noviyanti, Irma; Prastianto, Rudi Walujo; Murdjito, Murdjito
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.10511

Abstract

A marginal field defines as an oil and/or gas field that has a short production period, low proven reservoir, and could not be exploited using existing technology. As the demand for oil and gas keeps increasing, one of the solutions to tackle the issues is to build the modified platform which came to be more minimalist to conduct the oil and gas production in the marginal field. Naturally, the minimum offshore structures are cost less but low in redundancy, therefore, pose more risks. Although the study on the minimum structures is still uncommon, there are opportunities to find innovative systems that need to have a further analysis toward such invention. Therefore, this study took the modified jacket platform as a minimum structure, and local stresses analysis by using finite element method is applied for the most critical tubular joint with multiplanarity of the joint is taking into account. The analysis was carried out using the finite element program of Salome Meca with three-dimensional solid elements are used to model the multiplanar joint. Various loading types of axial force, in-plane bending moment, and out-of-plane bending moment are applied respectively to investigate the stress distribution along the brace-chord intersection line of the tubular joint. The results show that the hotspot stress occurred at a different point along each brace-chord intersection line for each loading type. Finally, as compared to the in-plane bending moment or out-of-plane bending moment loading types, the axial force loading state is thought to generate greater hotspot stress.
Hubungan Kondisi Rajungan (Portunus Pelagicus) dan Ekosistem Padang Lamun di Perairan Pulau Poteran Madura Rifadillah Hisamuddin; Iqbal Wicaksono; Achmad Fachruddin Syah
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.10479

Abstract

Crab is one of the marine biota which has important economic value, meanwhile, seagrass beds are one of the marine resources that have many benefits for marine life and the coastal environment. This study aims to determine the catch of small crabs and the condition of the seagrass beds in Poteran Island waters. This research uses Sentinel-2A image data downloaded from the earthexplorer.usgs.gov website; Earth Map (RBI) scale 1: 1,000,000, and field data in the form of identification of seagrass objects and water quality. The results showed that the number of female crabs that were caught was more than the male crabs. Based on the width of the carapace, the catch is categorized as unfit to catch. However, based on the weight measurement, the crabs that were caught were categorized as fit to catch. The results of the regression analysis showed that the length and weight of the crab had a fairly good relationship with a regression coefficient of 0.63. The length of the crab is more dominant than the weight. This is indicated by the negative allometric growth pattern (b less than 3). Many crabs are distributed in areas close to seagrass beds. Two types of seagrass were found, namely Enhalus acoroides and Halodule uninervis with rich or healthy conditions. Good water quality is believed to be one of the factors that support the growth of seagrass beds in the waters around Poteran Island.
Strategi Pengembangan Komoditas Pangan Menuju Ketahanan Pangan Nasional Dengan Pendekatan SWOT-ISM-BSC Herjito, Agus; Setiawan, Daniel
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.10864

Abstract

Sampai saat ini Ketahanan Pangan Nasional Indonesia masih berada pada kondisi yang belum stabil. Kondisi ini memberikan gambaran nyata bahwa ada permasalahan yang dialami bangsa Indonesia di bidang ketahanan pangan. Karena pada posisi keberadaan wilayah Indonesia yang sangat strategis maka semestinya Indonesia menjadi bangsa dan negara yang makmur dan mandiri dalam hal sumber pangan. Penelitian ini bertujuan untuk mengembangan strategi kebijakan pengembangan komoditas pangan menuju ketahanan pangan nasional. Dalam mendukung penelitian ini digunakan metode SWOT, Interpretative Structural Modeling (ISM), dan Balanced Score Card (BSC). Metode SWOT digunakan untuk merumuskan strategi berdasarkan identifikasi faktor internal dan faktor eksternal yang berpengaruh signifikan berbasis model Mckinsey 7S dan PEST. Selanjutnya metode ISM digunakan untuk menentukan prioritas strategi. Metode BSC digunakan untuk menentukan rencana implementasi dan pemetaan dari strategi-strategi yang dirumuskan. Pengembangan strategi kebijakan pengembangan komoditas pangan menuju ketahanan pangan nasional berdasarkan hasil penelitian terdiri dari 10 (sepuluh) strategi utama yang terdiri dari Strategi SO-1,2,3, Strategi WO-1,2,3, Strategi ST-1,2,3 dan Strategi WT-1. Diharapkan kesepuluh strategi hasil penelitian ini dapat meningkatkan pengembangan komoditas pangan Indonesia menuju Ketahanan Pangan Nasional yang stabil dan sustainable. 
Analisis Pola Rekrutmen Prajurit TNI AL Tahun 2020 Pada Satuan Pendidikan Sorong Dalam Rangka Penyediaan Prajurit Koarmada III Lakipundu Rassa, Andri Yusuf Kristmas; Lestari, Amin
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.11293

Abstract

The study aims to improve the quality and quantity of Indonesian Navy human resources in Eastern Indonesia, especially in the working area of the Fleet Command III, so the recruitment of Indonesian Navy soldiers will fill the needs of personnel in Eastern Indonesia. The object of research in the form of individuals are the officers or personnel officers who handle the recruitment of candidates of the Indonesian Navy soldiers. As for the object of research in the form of organizations, namely Spersal, Lapetal Disminpersal, Panda Lantamal X Jayapura, Panda Lantamal XI Merauke and Panda Lantamal XIV Sorong. This study uses the following analytical techniques: grouping data based on the characteristics of informants, conducting a qualitative approach to find out in detail how descriptive study of recruitment patterns in each Panda, then combining literature review, data from the reality in the field, and the experience of informants to gain a general knowledge of the recruitment pattern in the Sorong Education Units. The results showed that the recruitment pattern at the Sorong Educational Service which supervised Panda Lantamal X Jayapura, Panda Lantamal XI Merauke and Panda Lantamal XIV Sorong, had been going well, regardless of the obstacles they faced.
Kinetika Reaksi Pembuatan Sabun dan Pemurnian Gliserol dari Limbah Alkali Sabun: Review Panjaitan, Jabosar Ronggur Hamonangan
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.10626

Abstract

Soap is a product that commonly used as a cleanser and can be made through a saponification reaction between fat and base with glycerol as byproduct. The reaction kinetics of soap production is the study of how fast the soap production and it is an important part in reactor modeling and the optimization of operating conditions. On the other hand, glycerol is a byproduct of soap production which can be applied into various derivative products so that the glycerol purification process from soap production process is important to do. This review discusses the reaction kinetics of soap production and glycerol purification from alkaline soap waste. In general, the kinetics curve of the soap-making reaction consists of three stages, namely the induction period, the constant velocity period and the decreasing velocity period where the base concentration in the soaping reaction was related to the reaction rate. The lower base concentration used, the soap production reaction will slower. The soap production reaction had low activation energy and identified as second order reaction. In the process of purifying glycerol from alkaline soap waste, three main stages were generally used, namely neutralization, alcohol separation and glycerol purification.

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