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All Journal Pendidikan Biologi Jurnal Pembangunan dan Alam Lestari Jurnal IPTEK Prosiding Seminar Nasional Sains dan Teknologi Terapan Akrab Juara : Jurnal Ilmu-ilmu Sosial Journal of Applied Sciences, Management and Engineering Technology (JASMET) Al-MIKRAJ: Jurnal studi Islam dan Humaniora Prosiding Seminar Nasional Teknologi Industri Berkelanjutan Jurnal of Information Technology and Society (JITS)
Suheni Suheni
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Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Social Sciences

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The Mechanical Properties and Microstructure Analysis of Carbon Structural Steel After Quenching in Circulated Water Medium Rosidah, Afira Ainur; Setyowati, Vuri Ayu; Suheni, Suheni; Febrianto, Muhamad
Jurnal IPTEK Vol 26, No 1 (2022)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2022.v26i1.1139

Abstract

The use of carbon structural steel in construction is widely developed. It is important to do research continuously in order to get the optimum mechanical and physical properties of a material. Heat treatment which includes heating and quenching is a process that can be carried out to improve mechanical properties. A fast cooling rate is used to obtain higher strength and hardness. This research studied the effect of quenching using circulated water medium with water flow rate variations in structural steel Q235, Q255, and Q275 to their mechanical properties and microstructure. The heat treatment process was done with hardening at 1150oC, roll milling at austenitizing temperature, then quenching using circulated water medium with water flow rate of 225, 238, 247 m3/h. The tensile and hardness test results showed that water flow rate and carbon content in steel give an effect on strength and hardness. The highest tensile strength and hardness value were achieved by Q275 steel with a flow rate of 247 m3/h, which are 73,49 kgf/mm2 and 298 HVN, respectively. Meanwhile, the microstructures resulted in the presence of the mixture of martensite and pearlite, as well as ferrite in every sample with the increase in the composition of martensite and pearlite in Q275 steel with a flow rate of 247 m3/h.
Strategi Komunikasi pada Marketing Communication PT. Global Sigma Mandiri dalam Mepengaruhi Pelanggan Melalui Media Sosial Whatsapp Suheni, Suheni; Hardian, Arvin; Hadi, Sari Ekowati
AL-MIKRAJ Jurnal Studi Islam dan Humaniora Vol. 5 No. 2 (2025): Al-Mikraj, Jurnal Studi Islam dan Humaniora
Publisher : Pascasarjana Institut Agama Islam Sunan Giri Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37680/almikraj.v5i2.6985

Abstract

This research aims to analyze the communication strategy implemented by PT Global Sigma Mandiri in influencing customers through WhatsApp social media in the context of marketing communication. The method used in this research is a qualitative approach with descriptive analysis. Data were obtained through interviews with the company's marketing staff and analysis of WhatsApp content used in communication with customers. The results showed that PT Global Sigma Mandiri uses various approaches in marketing communication, including the delivery of customized promotional messages, personalized customer relationship management, and utilization of WhatsApp features to build two-way communication. Thus, WhatsApp as a communication platform is effective in increasing customer engagement and satisfaction.
Environment Sustainability Development Engineering Through The Reduction of Exhaust Gas Based on Metal Waste With Accurate Composition Suheni, Suheni; Sunoko, Rudy; leksono, Amin Setyo; Wahyudi, Slamet
Jurnal Pembangunan dan Alam Lestari Vol. 16 No. 2 (2025): Jurnal Pembangunan dan Alam Lestari
Publisher : Postgraduate School of Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpal.2025.016.02.09

Abstract

Technological developments have resulted in an increasing number of motorized vehicles such as motorbikes, cars, and other modes of transportation, which will result in a lot of air pollution due to exhaust emissions from fossil fuels. Substances from the hazardous exhaust gases include carbon monoxide (CO), carbon dioxide (CO2), nitrogen oxides (NO or NOx), and hydrocarbons (HC). This research was conducted by designing a catalytic converter using a mixture of several metals obtained from various wastes in Small and Medium Enterprises. A mixture of copper, brass, aluminum, and zinc is to be made as a muffler or exhaust on the test vehicle, namely the 2005 Car with observed exhaust emissions, namely CO & HC, using a Gas Analyzer. Measurements were taken at vehicle rotation of 1000 rpm, 2000 rpm, 3000 rpm, 4000 rpm, and 5000 rpm. The results of this study indicate that the highest percentage reduction in CO levels was when using a catalyst with an engine speed of 2000 rpm, which was 5.23% with Pertamax fuel, while for Pertalite fuel, when using a catalyst with an engine speed of 2000 rpm, it was 5.5%. The highest percentage reduction in HC levels was when using a catalyst at 1000 rpm engine speed of 645 with Pertamax fuel, while for Pertalite fuel, using a catalyst at 1000 rpm engine speed was 705.5.   Keywords: Aluminium, Brass, Catalytic Converter, Copper, Gas Analyzer, Zinc
Co-Authors Afira Ainur Rosidah Altiarika, Eka Amin Setyo Leksono Ardyansah, Firmart arianti, rita Arifin, Ahmad Anas Arvin Hardian Ayu Setyowati, Vuri Aziz Aziz Danang Prayoga, Danang Delia Putri Dian Hayati Eriek Wahyu Restu Widodo Febrianto, Muhamad Feri Alfian Pradana Hadi, Sari Ekowati Herdianto, Albertus Nova Tomy I Gusti Bagus Wiksuana Iftika Philo Wardani Kuntoro, Ryan Cahyo Meriza Febriani Pradana, Feri Alfian Pramudya, Andika Dayva Hera Pratama, Suprayuandi Primaningtyas, Widya Emilia Putri, Delia Qiromi, Ilham Renny Risdawati Reswara, Moch Arief Arya Rita Arianti Samudra, Ilham Prajala Saputro, Agung Bagus Sasongko, Sukendro Broto Setyowati, Vuri Ayu Setyowati, Vuri Ayu Setyowati, Vuri Ayu Slamet Wahyudi Sunoko, Rudy Syahara, Hariz Tendiardhi, Tendiardhi Ubaidulloh, Dawud Ariza Wardani, Iftika Philo Wulandari, Yustia Yudistira Bagus Pratama