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All Journal Jurnal Pendidikan Usia Dini Jurisprudentie Jurnal EMT KITA Jurnal Pendidikan : Riset dan Konseptual al-Afkar, Journal For Islamic Studies Indonesian Mining Journal Pendas : Jurnah Ilmiah Pendidikan Dasar Jurnal Pembangunan Berkelanjutan JSAI (Journal Scientific and Applied Informatics) Infotekmesin Santhet: (Jurnal Sejarah, Pendidikan Dan Humaniora) The Art of Teaching English as a Foreign Language (TATEFL) PUCUK REBUNG: Jurnal Pengabdian kepada Masyarakat Majalah Keadilan JEMSI (Jurnal Ekonomi, Manajemen, dan Akuntansi) Jurnal Dunia Pendidikan Ad-DA’WAH: Dakwah dan Komunikasi Islam Gudang Jurnal Multidisiplin Ilmu Banda Historia: Jurnal Pendidikan Sejarah dan Studi Budaya JURNAL RUANG HUKUM Jurnal Peweka Tadulako The International Journal of Medical Science and Health Research Al-Musthafa: Jurnal Kependidikan dan Keilmuan Berbasis Islam AT-TAKLIM: Jurnal Pendidikan Multidisiplin CITAKARYA Jurnal Pengabdian Masyarakat
Syarifudin
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Karakteristik Emisi CO dan HC Mesin bensin SOHC 110cc Berbahan bakar Pertalite-Alkohol Syarifudin; Fatkhurrozak, Faqih; Lukman Sanjaya, Firman; Yohana, Eflita; Syaiful
Infotekmesin Vol 13 No 1 (2022): Infotekmesin: Januari, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i1.1067

Abstract

Community economic activities that encourage motorized vehicles are getting higher. This exacerbates dependence on fossil fuels and air pollution. The outside air that is contaminated with exhaust gases from combustion products is very dangerous for human health. Motorized vehicles such as motorcycles are the largest cause of air pollution. Alcohols have high octane number and low viscosity. The use of ethanol and methanol alcohols is very diverse, so they are easy to obtain. Therefore, alcohol ethanol and methanol are suitable as premium fossil fuel mixtures. This study aims to observe the CO and HC emission characteristics of the gasoline engine using a premium-alcohol mixture of ethanol, methanol. The alcohol concentration was varied from 5% to 15% at 5% intervals. The petrol engine is operated at 2000, 3000, and 4000rpm. Commercial Gas Analyzers are used to measure CO and HC emissions coming out of the exhaust. The results of the observations present the CO and HC emissions of the engine with premium-ethanol fuel, methanol is lower than pure premium (P100). CO emissions from PE15 fuel decreased to 66,30%, and PM15 decreased to 90,63%. Meanwhile, PE15 fuel HC emissions decreased by 58,94%, and PM15 decreased by 68,60%.
Pengaruh Exhaust Gas Recirculation (EGR) Terhadap Exhaust Gas Temperature (EGT) dan Smoke opacity Mesin Diesel 4JB1 Berbahan Bakar Biodiesel Jatropa-etanol Syarifudin; Faqih Fatkhurrozak; Firman Lukman Sanjaya; Ahmad Farid
Infotekmesin Vol 13 No 2 (2022): Infotekmesin: Juli, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i2.1542

Abstract

Human dependence on motorized vehicles is getting higher and uncontrollable. This actualization will certainly have an impact on reducing fuel stocks and air pollution with soot emissions. Combining diesel fuel with jatropha and alcohol is predicted to reduce dependence on diesel fuel and air pollution. Supplying the combustion chamber with exhaust gas/Exhaust Gas Recirculation/EGR is also predicted to reduce soot emissions and reduce fuel consumption. This study aims to observe the effect of using the EGR system on the use of mixed fuel jatropha and ethanol exhaust gas temperature/EGT as an indication of performance and soot/smoke opacity as exhaust emissions. The experimental results show the use of the EGR system increases EGT and Smoke opacity decreases the diesel engine in each fuel variation. D100 fuel EGT increased 1.67%, DJ10 increased 0.71%, DJ10E increased 0.67%, DJ20 increased 1.45%, DJ20DE increased 1.07%, DJ30 increased 1.50%, and DJ30E fuel EGT increased by 1.47%. While on the emission side, the smoke opacity of D100 fuel decreased by 1.84%, DJ10 decreased by 1.71%, DJ10E decreased by 2.21%, DJ20 decreased by 0.96%, and DJ20E decreased by 2.33, DJ30 decreased by 2.99%, and DJ30E fuel decreased 1.30%.
Uji Eksperimental Emisi Gas Buang Mesin Bensin 160 cc Berbahan Bakar Campuran Pertalite-Butanol dan Pertalite-Diethyl Ether (DEE) Firman Lukman Sanjaya; Syarifudin; Faqih Fatkhurrozak; Nur Aidi Ariyanto
Infotekmesin Vol 13 No 2 (2022): Infotekmesin: Juli, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i2.1543

Abstract

Air pollution is increasing due to the high exhaust emissions of motorized vehicles using fossil fuels. The solution is the use of alternative energy. Butanol and Diethyl Ether (DEE) are alcohols that can be used as a fuel mixture and are environmentally friendly. This is because butanol and DEE have high oxygen levels so the oxidation process in the combustion chamber increases and the residual gas results from combustion is better. This study tested the residual gas from the combustion of a 160 cc gasoline engine using a mixture of pertalite-butanol and pertalite-DEE fuels with 5%, 10%, and 15% alcohol percentages. The test results show that adding DEE produces better engine exhaust emissions than adding butanol. CO emissions decreased by 87% using DEE15 while B15 reduced CO by 72%. DEE10 improves HC by 73% while B15 improves HC by 72%. However, DEE15 increases CO2 by 17% and B15 by 11%. Meanwhile, the oxygen content increased by 8% in DEE15 and 6% in B15 compared to pure pertalite.
Analisis Penambahan Methanol 5%, 10% dan 15% Terhadap Torsi, Daya dan Exhaust Gas Temperature (EGT) Mesin Bensin 150 CC Berbahan Bakar Pertamax Fatkhurrozak, Faqih; Lukman Sanjaya, Firman; Syarifudin; Nur Akhmadi, Amin; Ariyanto, Nur Aidi; Gunawan
Infotekmesin Vol 15 No 1 (2024): Infotekmesin: Januari, 2024
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v15i1.2064

Abstract

Indonesia is one of the countries that uses the most motorized vehicles, which increases air pollution and fuel crises. Using biofuel is one solution to overcome this problem. Methanol is used as a mixture of Pertamax to produce environmentally friendly and renewable biofuel. This is because methanol has high octane and oxygen. Mixing methanol in Pertamax was carried out to analyze the impact of Torque, Power, and Exhaust Gas Temperature (EGT) of a 150cc petrol engine. Methanol 5%, 10%, and 15% was mixed into Pertamax with engine speed variations of 1000, 2000 and 3000 rpm. Dynotest is used to measure engine performance and thermocouples to measure EGT. Test results show the highest increase in engine torque and power of up to 25% at a speed of 2000 rpm with the PM15 mixture compared to P100. The highest reduction in EGT value occurred when using the PM15 mixture at a speed of 1000 rpm up to 28% compared to P100. This shows that the addition of methanol to Pertamax increases torque and power and reduces the EGT of the gasoline engine.
Brake Thermal Efficiency dan Exhaust Gas Temperature Mesin Bensin Berbahan Bakar Gasoline-Butanol Sanjaya, Firman Lukman; Fatkhurrozak, Faqih; Syarifudin; Nur Akhmadi, Amin
Infotekmesin Vol 15 No 1 (2024): Infotekmesin: Januari, 2024
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v15i1.2154

Abstract

The development of butanol as a gasoline additive is encouraged by the government to reduce pollution and the fuel crisis. This is because butanol is a green fuel that is environmentally friendly and can be produced. In addition, the octane number and high oxygen concentration in butanol optimize engine performance and improve exhaust emissions. This research correlates engine power and Brake specific fuel consumption (BSFC) with the BTE of gasoline-butanol-fueled engines and identifies the content of Nox compounds in exhaust gases through engine Exhaust Gas Temperature (EGT). The percentage of butanol in gasoline is 5% -15%. Engine speed from 1000-3000 rpm. Dynotest is used to measure BTE while the thermocouple is used to measure exhaust gas temperature. This research proves that the addition of butanol increases energy absorption which is converted into power with effective fuel consumption which means BTE increases. The highest BTE increase was 21.7% in the B15 blend. EGT decreased by 8.6% in the B16 mixture compared to B0. This identifies that the concentration of Nox in the exhaust gas also decreases.
Perancangan Skema Dual Port Injection Sistem Electric Control Unit Motor Spark Ignition Syarifudin; Kusnadi; Yohana, Eflita; Suhartana; Fatkhurrozak, Faqih; Lukman Sanjaya, Firman
Infotekmesin Vol 15 No 1 (2024): Infotekmesin: Januari, 2024
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v15i1.2157

Abstract

Blending fuels is an urgent alternative to reduce dependence on gasoline. Blending gasoline-alcohol bioethanol is realistic due to its high octane number properties and the abundant availability of raw materials. However, high viscosity results in inconsistent fuel mixing homogenization and decreased injector performance. The research aims to design a Dual Port Injection scheme as a dummy simulation of fuel blending so that bioethanol alcohol can be homogeneously blended with gasoline in the combustion chamber. The method used is observation of the Electric Fuel Injection working system and designing a Dual Port Injection Scheme. The research resulted in a Dual Port Injection scheme with the concept of doubling the injection-based fuel system and commands from the commercial Electric Control Unit to be forwarded to the bioethanol and bioethanol fuel pumps to supply fuel to the high pressure pipe.
Korelasi Nilai Oktan dan Kandungan Oksigen Biofuel Mangrove dengan Brake Torque dan Emisi NOx Mesin Bensin 150cc Syarifudin; Khumaidi Usman, Muhamad; Fatkhurrozak, Faqih; Lukman Sanjaya, Firman
Infotekmesin Vol 16 No 1 (2025): Infotekmesin: Januari 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i1.2565

Abstract

Alternative fuels are a priority to reduce the problem of fuel stock shortages. Bioethanol has potential because of its octane number specifications, oxygen content, and simple production techniques. Mangrove bioethanol is produced from mangrove fruit, which is non-edible and abundant. This study aims to observe the correlation of Mangrove Biofuel specifications (mixture of gasoline and 5% Mangrove Bioethanol) to Brake Torque and NOx Emissions produced by gasoline engines. Experimental methods are applied, from Mangrove Bioethanol production, octane value, oxygen content testing, and Mangrove Biofuel production to performance and emission testing. The results of the study showed that the correlation of the 101 octane number specifications and 30.31% oxygen content of Mangrove Biofuel increased the highest Brake Torque, reaching 5.45%, and increased the highest NOx emissions up to 6.54% at engine speeds of 5000 rpm.
Post Covid-19 Reflection from Indonesian EFL Students on Their Learning Autonomy Ariawan, Soni; Syarifudin; Zaikalina, Rabbania
The Art of Teaching English as a Foreign Language (TATEFL) Vol. 5 No. 2 (2024): November
Publisher : STKIP AGAMA HINDU SINGARAJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36663/tatefl.v5i2.879

Abstract

Distance learning is an alternative way to reduce the spread of the Covid-19 pandemic. In this situation, learning was conducted through electronic media and internet connection independently. So, in this case, students must take the initiative to understand the material without having a face-to-face guide from the teacher which might increase their learning autonomy. This research aims to examine students’ reflections on how they learned English autonomously during the Covid-19 pandemic unveil the perception of learner autonomy, and find out the factors that influence learner autonomy after experiencing distance learning. The present research implemented a mixed-method of research design by administering the questionnaire and conducting a semi-structured interview. The respondents were the students of the English Language Education Study Program at the State Islamic University of Mataram. The findings showed that students gain autonomy in English learning by utilizing the internet resources optimally, such as YouTube, Google, social media, and learning applications during distance learning. They also have a very positive response to learning autonomy, in terms of the role of the learner, the role of the lecturer, the type of task, and the role of the environment
PENERAPAN MODEL PEMBELAJARAN AIR (AUDITORY, INTELECTUALLY, AND REPETITION) UNTUK MENINGKATKAN HASIL BELAJAR Dina Liana; Masriani; Syarifudin; Erma Susanti
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 10 No. 02 (2025): Volume 10 No. 02 Juni 2025
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v10i02.26608

Abstract

Penelitian ini bertujuan untuk meningkatkan literasi numerasi melalui model Pembelajaran AIR (Auditory, Intelectually, Repitition) di kelas V Siswa SDN 001 Tembilahan Kabupaten Indragiri Hilir Provinsi Riau. Adapun Jenis penelitian yang digunakan adalah jenis penelitian tindakan kelas. dengan metode mixed methode yaitu metode kulitatif dan kuantitatif. Penelitian tindakan kelas adalah suatu kegiatan penelitian dengan mencermati sebuah kegiatan belajar yang diberikan tindakan, adapun hasil penelitian yg diperoleh yaitu aktivitas guru mencapai rata-rata 78,56% dan aktivitas siswa 66,23%, keduanya masuk kategori “baik”. Selain itu, skor rata-rata kemampuan literasi numerasi siswa meningkat dari 58,40 pada pra-siklus menjadi 79,59 pada siklus 2, dengan ketuntasan belajar yang juga meningkat dari 22,72% menjadi 86,36%. Jadi dapat disimpulkan bahwa model pembalajaran AIR dapat meningkatkan literasi siswa kelas V di SDN 001 Tembilahan.
PENGARUH PENGGUNAAN MEDIA PEMBELAJARAN BERBASIS ARTICULATE STORYLINE 3 TERHADAP MOTIVASI BELAJAR SISWA MATA PELAJARAN TIK MATERI SISTEM KOMPUTER KELAS VII Kurrata A’yunin; Syarifudin; Ita Fitriati
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 10 No. 3 (2025): Volume 10 No3 September, 2025
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v10i3.31951

Abstract

This study aims to determine the effect of using Articulate Storyline 3-based learning media on students' learning motivation in seventh-grade computer system material in Information and Communication Technology (ICT) subject. The research employed a quantitative approach with a pre-experimental design using One Group Pretest-Posttest Design, involving 20 students as the sample. The research instruments consisted of pretest, posttest, motivation questionnaires, and observation sheets. The results showed an increase in the average score from 52.25 (pretest) to 80.00 (posttest), with an N-Gain score of 0.58 categorized as moderate. The paired sample t-test indicated a significance value of 0.000 < 0.05, meaning there was a significant difference between students' scores before and after using the media. The motivation questionnaire also revealed an increase in all indicators, including learning enthusiasm, engagement, and interest in the material. Thus, the Articulate Storyline 3-based learning media was proven effective in enhancing students' learning motivation and outcomes in ICT learning. This media serves as an innovative learning solution that presents abstract material in a more visual, interactive, and engaging way, making it highly recommended for digital-based learning in junior high schools.
Co-Authors Aan, Milki Abubekar, Udin Aditya Kafi Amrullah Ahmad Farid Aisyah Nur Atika Aisyi Salsabila Hanum Al Kahfi Ali Murtadho Amanda, Ridho Rizky Ambarita, Novitasari Andri Zulpan angelia, novita mayasari Ardi Ariyanto, Nur Aidi Derysmono Desi Ramayanti Destanika Dhiffa Ralianti Dina Liana Dwi Budi Srisulistiowati Eflita Yohana Elizabeth Nafthaliana Bermuli Erasma Eva Eriani Faqih Fatkhurrozak Fatkhurrozak, Faqih Fatorrohman Firman Lukman Sanjaya Gunawan Haidor HANIF , MUHAMMAD Hermalina Sinay Hisni Rahmi Ita Fitriati K Khutobah Khumaidi Usman, Muhamad Kmas M. Eka Fhitrah Kurrata A’yunin Kusnadi Lukman Sanjaya, Firman Lutfi Ariefianto Luthfi Maimunah Masriani . Misno Muhaimin Abdillah MUHAMAD Muhammad Irfan Syahroni Mukti, Aryani Kusuma Musdirwan Nanda Alfan Kurniawan Nina Agustina, Nina Nur Aidi Ariyanto Nur Akhmadi, Amin Nurul Fadilah Pamela Mercy Papilaya Rahmi Nur Azizah restu juniah, restu Reza Gusni Saputra Ridhwan, M Rimanda, Fiqri Roby Rovi Azmi Salsabila Sanjaya, Firman Lukman Sari Pratiwi, Yasintha Sherly Nelsa Fitri Sikki, Nurhaeni Soni Ariawan Sri Mulyati Suhartana Sukatin, Sukatin Supriyanto Syaifudin Zakir, Syaifudin Syaiful Tjandring, Yuni Cynthia Dewi Widyaswati, Rahmatya Zaikalina, Rabbania Zidan Rais , Rifqi