Article Per Year (5 Year)
p-Index From 2020 - 2025
0.61
P-Index
This Author published in this journals
All Journal Jurnal Kelautan : Indonesian Journal of Marine Science and Technology Juriti Prima (Jurnal Ilmiah Teknik Industri Prima) Ilomata International Journal of Tax and Accounting Jurnal Rekayasa elektrika
Rizki Abdullah
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Public Health Social Sciences

Published : 5 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 5 Documents
Search

 1 
Variasi dan Komposisi Bentuk Pertumbuhan Karang (Life Form) di Perairan Bintan Timur Rizki Abdullah; Ita Karlina; Dedy Kurniawan; Risandi Dwirama Putra; Asep Mulyono
Jurnal Kelautan Vol 16, No 1: April (2023)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v16i1.15212

Abstract

ABSTRAKPenelitian ini mengkaji tentang keanekaragaman bentuk kehidupan pertumbuhan karang di perairan Bintan bagian timur. Tujuan penelitian ini adalah untuk mengetahui bentuk kehidupan bentuk life form karang dan untuk mengetahui persentase jenis tutupan terumbu karang, indeks keanekaragaman, keseragaman. Indeks dan indeks dominasi spesies di Bintan bagian timur. Penelitian ini dilakukan dengan menggunakan metode under photo transect (UPT) dengan panjang transek garis yang digunakan adalah 50m dengan luas pemotretan (58 x 44) cm2. Hasil penelitian menunjukkan bahwa pada stasiun satu di perairan Kawal persentase tutupan karang hidup sebesar 41.80% termasuk dalam kategori sedang. Ada 8 jenis pertumbuhan karang bentuk kehidupan, yaitu CM, CF, ACE, ACT, CS, CE, CB, CMR. Pada stasiun dua di perairan Teluk Bakau persentase tutupan karang hidup sebesar 47,40% dikategorikan sedang. Ada 7 jenis pertumbuhan karang bentuk kehidupan yang ditemukan, yaitu CM, CF, CE, CS, ACT, ACS, ACE. Pada stasiun tiga perairan Malang Rapat persentase tutupan karang hidup sebesar 41,53% termasuk kategori sedang. Ada 9 jenis pertumbuhan karang bentuk kehidupan yang ditemukan, yaitu CM, ACE, CS, CF, CE, CMR, ACS, ACT, CB.Kata kunci: Keanekaragaman, Life form Coral, Under Photo Transect (UPT),Tutupan karang, Perairan Bintan TimurABSTRACTThis research examines the diversity of life form coral growth in the waters of the eastern part of Bintan.The purpose of this research aimed to determine the growth form of life form corals the percentage of coral reef cover types, diversity index, uniformity index and species dominance index in the eastern part of Bintan. This research was conducted using the under photo transect (UPT) method with the length of the line transect used was 50m with a photo area (58 x 44) cm2. The results showed that at station one in Kawal waters, the percentage of life coral cover was 41.80%, categorized as medium. There were 8 types of life form coral growth, namely CM, CF, ACE, ACT, CS, CE, CB, CMR. At station two in the waters of the Teluk Bakau, the percentage of live coral cover was 47,40% categorized as moderate. There were 7 types of life form coral growth found, namely CM, CF, CE, CS, ACT, ACS, ACE. At station three in Malang Rapat waters, the percentage of live coral cover was 41,53% categorized as medium. There were 9 types of life form coral growth found, namely CM, ACE, CS, CF, CE, CMR, ACS, ACT, CB.Keywords: Diversity, Life form coral, Under Photo Transect (UPT), Coral cover, East Bintan waters
Portable Battery Charger Berbasis Sel Surya Budhi Anto; Edy Hamdani; Rizki Abdullah
Jurnal Rekayasa Elektrika Vol 11, No 1 (2014)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (786.573 KB) | DOI: 10.17529/jre.v11i1.1991

Abstract

A type of solar battery charger is introduced in this paper. This equipment functions as a medium size rechargeable battery that is needed to move culinary merchants and coastal fishermen living in area which is not supplied by electrical networks. The equipment consists of solar module mounted onto portable mechanical construction, a 12-V 7.5-Ah lead acid battery and charge controller. Solar module charges the battery through charge controller and then the battery can be discharged to power on electric lamps for lightening culinary wagon or fisherman’s boat at night. Charge controller charges the battery with float charging which is implemented by maintaining 13.5 Volt between battery terminals and limiting the charging current to 1.5 Amperes. Charge controller circuit is based on adjustable linear voltage regulator LM338. The battery is of sealed lead acid type. This type of battery is maintenance free and more hygiene than other types of lead acid battery. The field experiment of charging the baterry of 50% residual capacity from 8 am to 4 pm under sunny weather shows that the solar module has charged the battery to its full capacity under battery safe charging conditions.Keywords: portable solar battery charger, float charging, LM338
Portable Battery Charger Berbasis Sel Surya Budhi Anto; Edy Hamdani; Rizki Abdullah
Jurnal Rekayasa Elektrika Vol 11, No 1 (2014)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17529/jre.v11i1.1991

Abstract

A type of solar battery charger is introduced in this paper. This equipment functions as a medium size rechargeable battery that is needed to move culinary merchants and coastal fishermen living in area which is not supplied by electrical networks. The equipment consists of solar module mounted onto portable mechanical construction, a 12-V 7.5-Ah lead acid battery and charge controller. Solar module charges the battery through charge controller and then the battery can be discharged to power on electric lamps for lightening culinary wagon or fisherman’s boat at night. Charge controller charges the battery with float charging which is implemented by maintaining 13.5 Volt between battery terminals and limiting the charging current to 1.5 Amperes. Charge controller circuit is based on adjustable linear voltage regulator LM338. The battery is of sealed lead acid type. This type of battery is maintenance free and more hygiene than other types of lead acid battery. The field experiment of charging the baterry of 50% residual capacity from 8 am to 4 pm under sunny weather shows that the solar module has charged the battery to its full capacity under battery safe charging conditions.Keywords: portable solar battery charger, float charging, LM338
Analisis Perencanaan Persediaan Bahan Baku Duplex dengan Pendeketan Material Requirement Planning (MRP) Saeful Imam; Abdullah, Rizki
JURITI (Jurnal Ilmiah Teknik Industri )Prima Vol 7 No 1 (2023): Juriti Prima (Jurnal Ilmiah Teknik Industri Prima)
Publisher : Fakultas Teknologi dan Ilmu Komputer, Universitas Prima Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34012/juritiprima.v7i1.4087

Abstract

PT X merupakan sebuah perusahaan yang berfokus pada cetak kemasan dengan menggunakan teknik offset dan pabrik ini memproduksi berbagai jenis kemasan untuk berbagai produk. Bahan utama yang sering digunakan oleh PT X adalah Duplex Coated dengan ketebalan 350 GSM. Saat melakukan pembelian bahan baku, PT X masih menggunakan metode perhitungan manual. Akan tetapi, metode ini menjadi permasalahan karena perusahaan seringkali mengalami kekurangan bahan baku ketika sedang dalam tahap produksi produk tertentu, juga berulang kali melakukan pembelian bahan baku yang sama. Tujuan dari penelitian ini adalah untuk menganalisis pengelolaan persediaan bahan baku dengan metode Material Requirement Planning (MRP) lot sizing yang paling sesuai dengan biaya terendah. Penelitian ini menggunakan peramalan Winter Exponential Smoothing. Hasil peramalan akan digunakan untuk menentukan rencana pembelian persediaan bahan baku dengan tiga metode MRP lot sizing yang berbeda, yaitu, Lot for Lot (LFL), Economic Order Quantity (EOQ), dan Period Order Quantity (POQ). Hasil dari penelitian ini menunjukkan bahwa metode LFL memberikan biaya perencanaan persediaan bahan baku yang lebih rendah dibandingkan dengan metode EOQ dan POQ. Biaya perencanaan dengan metode LFL adalah sebesar Rp378.174, lebih rendah dibandingkan dengan biaya sebesar Rp660.946 untuk metode EOQ dan Rp548.254 untuk metode POQ.
Determinants of Company Value With Information Transparency as Moderation In Food Beverage Sector Companies Ristiyana, Rida; Atichasari, Anna Sofia; Abdullah, Rizki
Ilomata International Journal of Tax and Accounting Vol. 5 No. 2 (2024): April 2024
Publisher : Yayasan Ilomata

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61194/ijtc.v5i2.1112

Abstract

This study aims to determine the effect of tax avoidance, company size, and leverage on company value with information transparency as moderation in food beverage sector companies listed on the IDX in 2017-2021. This type of research is quantitative research and the data used is secondary data. The population in this study amounted to 72 companies and obtained research samples using the purposive sampling method amounted to 13 companies. The data analysis method used is panel data regression analysis using Eviews version 10. The results simultaneously show that tax avoidance, company size and leverage affect company value. Partially, tax avoidance has a positive and significant effect on company value, while company size has a negative and significant effect on company value. Leverage and transparency of information do not affect company value. The results of the moderation effect prove that information transparency is not able to moderate the effect of tax avoidance on company value. On the other hand, information transparency is also unable to moderate the effect of leverage on company value. However, transparency of information can moderate by strengthening the influence of company size on company value.
Co-Authors Asep Mulyono Atichasari, Anna Sofia Budhi Anto Dedy Kurniawan Edy Hamdani Ita Karlina Risandi Dwirama Putra Saeful Imam, Saeful