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ANALISA KOROSI PIPA SOLAR MESIN DIESEL DI SEBUAH PT.X Syafrizal
Jurnal Konversi Energi dan Manufaktur Vol 3 No 2 (2016): JKEM : Jurnal Konversi Energi dan Manukfaktur UNJ Vol.3 No 2 tahun 2016
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (624.793 KB) | DOI: 10.21009/JKEM.3.2.4

Abstract

Telah terjadi korosi yang menimbulkan kebocoran pipa di Jakarta pusat dikarenakan pipa mengalami korosi,terkikis dan berlobang. Pipa bersentuhan dengan tanah cukup lembab dan diketahui tanah sekitar pipamemiliki kandungan garam dan ion Cl- yang dikenal cukup agresif, sehingga laju korosi pada pipa dapatterjadi lebih cepat. Lingkungan instalasi pipa sangat dekat dengan jalan raya dan bergetar, permukaan pipalebih cepat terkikis,menipis dan berlobang seperti yang diperlihatkan pada gambar 2. Hasil pengukuranbahwa area kebocoran pipa (11 x 11,3)mm, karena minyak solar juga mengandung sulfur cukup tinggisehingga membentuk larutan asam sulfat dengan air, asam sulfat dapat mempercepat laju korosi pada pipabaja. Untuk mencegah kejadian serupa maka telah diusulkan disain konstruksi pipa dengan tumpuan yangmemungkinkan untuk sebuah solusi, karena dapat mencegah gesekan permukaan pipa dengan tanah danmencegah reaksi garam dengan pipa. Penambahan biaya konstruksi pipa dengan tumpuan sekitar 5%, hal inibukanlah angka yang besar jika dibandingkan dengan umur pakai. Secara keseluruhan 3 faktor disain tersebutlebih menguatkan bahwa pengembangan disain konstruksi pipa perlu dilakukan sehingga pipa lebih aman dariefek teknis dan korosi lingkungan, serta umur pakai pipa dapat lebih lama.
RELATIONSHIP OF NITRATE AND PHOSPHATE CONCENTRATION ON PHYTOPLANKTON PRIMARY PRODUCTIVITY IN DUMAI RIVERS OF RIAU PROVINCE Syafrizal; Nurrachmi, Irvina; Efriyeldi, Efriyeldi
Asian Journal of Aquatic Sciences Vol 4 No 1 (2021): April 2021
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.4.1.54-64

Abstract

This research was conducted in January 2020 in the waters of the Sembilan Dumai River which aims to determine the concentration of nitrate and phosphate on the primary productivity of phytoplankton. The research method used in this research is the survey method while the determination of the research station was done by technic purposive sampling. The results showed that the average nitrate concentration ranged from 0.0194 - 0.0749 mg/l and the average phosphate concentration ranged from 0.1452 - 0.8502 mg/l. There are 6 classes of phytoplankton found in the waters of the Sembilan Dumai River, namely Bacillariophyceae, Cocinodiscophyceae, Chroococcophyceae, Cyanophyceae, Cyanobacteria and Xanthophyceae. The results of phytoplankton abundance calculations ranged from 74.07 - 280.09 Ind/L. The primary productivity value of phytoplankton for gross primary productivity ranged from 62.5 - 104.16 mgC/m2/jam, respiration values ​​ranged from 20.83 - 41.66 mgC/m2/jam and the net primary productivity value ranged from 41.67 - 72.91 mgC/m2/jam. The results of the multiple linear regression test for the relationship between nitrate and phosphate on the primary productivity of phytoplankton at each station are shown by the mathematical equation Y = 60.18 + (-233,19,35) x and Y = 60.18 + 30.44x with the coefficient of determination ( R2) = 0.140 and (R2) = 0.226 and the correlation coefficient (r) = 0.631, the mathematical equation states that the relationship between nitrate and phosphate on the primary productivity of phytoplankton is strong.
Analysis of Community and Local Politics The Challenge of the Horizontal Conflict (A Case Study in Kampar Riau, A Constructive Critical Thinking from the Perspective of Political Anthropology) Syafrizal
Konfrontasi: Jurnal Kultural, Ekonomi dan Perubahan Sosial Vol 8 No 3 (2021): Konfrontasi, September
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/konfrontasi2.v8i3.154

Abstract

This paper wants to critically explain constructively from the perspective of political anthropology, namely one thought on one of the social realities that develop in society Kampar Riau. Society is a group of people who live in one area for a certain period of time, who have emotional attachments and have a common goal. In that context, it is not uncommon for people to incarnate themselves into various situations, including in terms of politics and society. The phenomenon of folklore and local politics is a form of democratic life that is guaranteed by the laws of the Indonesian state. Everyone has their own life history. Talking about humans would be tantamount to talking about who is the owner and creator of all cultures. Humans create their experiences since childhood in the environment in which they were born. Community phenomenon is one of the oldest that characterizes a person's attitude, behavior pattern, which consciously or unconsciously will be incarnated in the long process of his life wherever that person takes part as an adult, such as taking part in an organization, company, or in a certain political party.
Customer Loyalty Research : The Cases of Existing E-Commerce Platforms Usmed, Dea Cyntika; Syafrizal; Alfitman; Yuliani, Fera; Hidayat, Tedi
Enrichment : Journal of Management Vol. 12 No. 1 (2021): November: Management Science
Publisher : Institute of Computer Science (IOCS)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Customer loyalty has become primary challenge to the existing e-commerce platforms in the competitive business environment. This research aims to determine the effects of several variables related elements to increasing customer loyalty in the digitalization, such as social media marketing, online customer experience, satisfaction, and positive word of mouth. We received 252 feedbacks, then the data were analyzed by assisting PLS 3.3 Software through the technique of SEM. We found there are fifth hypothesis in line with expectation, and two of them are rejected.
Kualitas Semen Beku Sapi Limousin BIB Tuah Sakato yang Disimpan di Pusat Pembibitan Ternak Sapi Aripan dengan Waktu Thawing yang Berbeda John Hendri; Harissatria; Syafrizal; Rafi Suryade Putra
Jurnal Peternakan Mahaputra Vol. 2 No. 1 (2021): Jurnal Peternakan Mahaputra
Publisher : Program Studi Peternakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36665/jpm.v2i1.38

Abstract

The purpose of this study was to determine the effect of thawing time on the quality of frozen semen of Limousin cattle. This study used an experimental method with a completely randomized design (CRD) with 4 treatments, namely thawing time of 0 seconds, 30 seconds, 60 seconds and 90 seconds at 38oC and 4 replications. The material in this study was frozen semen of 16 straws of Limousin cattle with the same stud code. This research was conducted at the Laboratory of Animal Biotechnology, Andalas University, Padang. From the results of the study, it can be seen that the thawing time of 0 seconds, 30 seconds, 60 seconds and 90 seconds gave a very significant difference (P<0.01) for the percentage of life, percentage of motility and percentage of abnormalities that were thawed at 38oC. It was concludedthat the effect of thawing time of 0 seconds was high on the percentage of motility, percentage of survival and percentage of abnormalities for thawing that could cause spermatozoa (cold shock) or damage.