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All Journal Pythagoras: Jurnal Matematika dan Pendidikan Matematika Teknik Sipil dan Arsitektur Humanis : Jurnal Pengabdian Kepada Masyarakat Jurnal Riset Pendidikan Matematika Jurnal Daya Matematis REKAYASA Jurnal Rekayasa Mesin BANGUN REKAPRIMA Journal of Islamic Architecture Jurnal Arsitektur ZONASI International Journal for Educational and Vocational Studies JGISE-Journal of Geospatial Information Science and Engineering Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika Jurnal Teknik Sipil dan Arsitektur CLLiENT (CULTURE, LITERATURE, LINGUISTICS, ENGLISH TEACHING) Eksergi: Jurnal Teknik Energi Pedagogy : Jurnal Pendidikan Matematika Jurnal Hilirisasi Technology kepada Masyarakat (SITECHMAS) E-JRM Jurnal Kajian dan Terapan Matematika TeknoKreatif: Jurnal Pengabdian kepada Masyarakat Jurnal Hasil-Hasil Pengabdian dan Pemberdayaan Masyarakat (JHP2M) Issues in Mathematics Educations (IMED) Jurnal Kemitraan, Kewirausahaan dan Pengabdian Masyarakat
Sahid Sahid
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Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Experimental Study Of The Performance Of A 5-Bladed Horizontal Axis Wind Turbine Of NACA 4415 Profile Using Winglets With Winglet Height Variation Mustofa, Rida; Sahid, Sahid; Adiprimaswara, Michael Putra Narendra; Aukad, Muhamad; Pratiwi, Okta Ayu; Sulistyoningtyas, Dian Lestari
Eksergi Vol. 20 No. 02 (2024): MAY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i02.5803

Abstract

Horizontal axis wind turbine is one type ofturbine used to convert wind energy into mechanical energy. Thepurpose of this research is to design, manufacture, test andanalyze the performance of horizontal shaft wind turbine NACA4415 airfoil blades that do not use winglets with those that usewinglet height variations. The stages of this research includepreparation of literature search, planning and making NACA4415 airfoil blades both using winglets and not using winglets,assembling test equipment and assembling wind turbineinstallations, testing and taking wind turbine performance data,data processing and analysis, final results. The turbine diameterused is 1.1m with a blade thickness of 18 mm and a chord lengthof 38mm. Tests were carried out with winglet height testvariables of 5%, 7%, 9%, and 11% of the rotor length at windspeeds of 4 m/s, 6 m/s, 8 m/s and 10 m/s. The test results showthat the NACA 4415 airfoil horizontal shaft wind turbine usinga winglet with a height of 7% has optimum performance at 4 m/sand 6 m/s with efficiencies of 23.68% and 8.75%, respectively,while when the wind speed is 8 m/s and 10 m/s the optimumturbine performance is achieved when using a 9% winglet withefficiencies of 6.12% and 3.64%, respectively. The mostoptimum turbine performance improvement is achieved whenusing a 7% winglet with an efficiency increase of 204.76% at awind speed test of 4 m/s. Keywords”” HAWT,
Performance Analysis of H-Type Darrieus Turbine Radial Projection Blades Based on NACA 0018 Sahid, Sahid; Mulyono, Mulyono; Arif Fauzi, Dhiyaulhaq
Eksergi Vol. 20 No. 02 (2024): MAY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i02.5806

Abstract

The H-type Darrieus turbine is a vertical windturbine that is used to convert wind energy into mechanicalenergy by utilizing lift force. This research is aimed at making amodified H-type Darrieus turbine blade model from a NACA0018 profile blade to a NACA 0018 blade with a chordlineprojected radially to the turbine diameter and the second resultis to compare the performance of the NACA 0018-based radialprojection blade to the performance of the NACA 0018 blade.This is preparation for searching literature, design making,manufacture of NACA 0018 blade test specimens and NACA0018 based radial shadow blades, assembly and installation oftest equipment, testing and data collection of wind turbineperformance, data processing and analysis, final results. Thevariables tested were wind speeds of 7 m/s, 8 m/s, 9 m/s, 10 m/s,11 m/s, 12 m/s. The test results show that the higher the TSR, thehigher the resulting power coefficient (Cp) until the maximumCp is reached. After that, the increasing TSR, the resulting Cp isgetting smaller. The test results show that projection bladesbased on NACA 0018 and NACA 0018 blades produce a smallmaximum Cp, respectively 0.082 and 0.124 compared to theDarrieus turbine maximum Cp reference on the vertical turbinecharacteristic chart, which is 0.4. The NACA 0018-based radialprojection produces a lower Cp than the NACA 0018 blade atspeeds of 7 m/s, 8 m/s, 10 m/s, 11 m/s, 12 m/s. At a wind speed of9 m/s the projection blade based on NACA 0018 produces ahigher power coefficient than the NACA 0018 blade. Projectingthe NACA 0018 blade chordline on the track causes the bladecross-sectional area and chordline length to shrink. The higherthe wind speed, the smaller the resulting Cp. The solidwallphenomenon affects turbine performance. Testing without loadat all wind speeds, the projection blade based on NACA 0018produces higher rotation than the NACA 0018 blade. Theparameter of the blade momentum affects the results of theturbine rotation when tested without load.
Experimental Study of the Performance of a Horizontal Axis Wind Turbine with A Flat Taper Type of 4:5 and an Outer Angle of 25° With Variations in The Number of Blades Anandia, Faranita Putri; Sahid, Sahid; Roihatin, Anis
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7110

Abstract

This experimental study investigates the performance of a Horizontal Axis Wind Turbine (HAWT) with a flat taper 4:5 blade design and a 25° exit angle, focusing on the effect of varying the number of blades (6, 9, and 12). The turbine, with a diameter of 1.1 m and blade dimensions of 470 mm length, 110 mm top width, and 137 mm bottom width, was tested at wind speeds of 3 m/s, 5 m/s, 7 m/s, and 9 m/s in a laboratory setting. Parameters such as wind speed, turbine rotation, voltage, and current were measured to analyze system efficiency. The results indicate that blade count and wind speed significantly influence efficiency. The highest efficiency of 12.51% was achieved at 3 m/s with 9 blades, while at 5 m/s, the efficiency peaked at 3.95% with 9 blades. For higher wind speeds (7 m/s and 9 m/s), the optimal efficiency decreased to 2.03% and 0.95%, respectively, both achieved with 6 blades. The study concludes that this turbine design is most effective at low wind speeds (≤5 m/s), making it suitable for regions with similar wind conditions, such as Indonesia. The findings contribute to optimizing blade configurations for small-scale wind energy applications.
Horizontal Axis Wind Turbine Efficiency Optimization Through Tip Radius Modification on 4:5 Flat Taper Blades Sahid, Sahid; Anandia, Faranita Putri; Wattimena, Christopher Johanes Edsel; Pratiwi, Okta Ayu; Tantri, Riris Annisa Tarra; Barid, Muhammad
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7112

Abstract

This study aims to investigate how changing the roundness of the back edge of blades affects a 4:5 flat taper wind turbine. Tests used blades with 5 mm, 10 mm, and 15 mm rounded edges, compared to a 5 mm notched blade, across wind speeds from 3 to 9 m/s. The results show the 5 mm rounded edge works best at low wind speeds, with an efficiency of 11.12% at 3 m/s. At higher wind velocities, the 15 mm rounded blade demonstrated superior aerodynamic performance, attaining an efficiency of 1.63% at 7 m/s. The rounded trailing edge improved aerodynamic behavior by minimizing turbulence and enhancing flow stability. Therefore, the optimal edge radius should be determined based on regional wind characteristics, especially for low-speed wind zones typical of Indonesia
THE PERCEIVED IMPACT OF TPR METHOD ON EFFECTIVENESS OF STUDENTS’ ENGLISH VOCABULARY IN SDN KALIBANGER Saputra, Dwiki Mifta; Sahid, Sahid
CLLiENT (Culture, Literature, Linguistics, and English Teaching) Vol 5 No 2 (2023): CLLiENT JOURNAL
Publisher : Language and Literature Faculty, Universitas Sains Al-Qur'an (UNSIQ) Jawa Tengah di Wonosobo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32699/cllient.v5i2.6663

Abstract

Enhancing the English vocabulary for the students become one of the most important part to have a good ability in English (speaking, listening, reading and also grammar). The perception of students toward the running process of increasing the English vocabulary are important to know. This study aims to investigate the students’ perception of using TPR (Total Physical Response) method on the effectiveness of studying English vocabulary and to what extend does TPR (Total Physical Response) method improve students’ English vocabulary. The quantitative data is obtained by conducting the Pre-Test and Post-Test Activity 1 and Post-Test Activity 2. And qualitative is to support the quantitative data. The result that that the Total Physical Response (TPR) method is very effective to help the students of enhancing the English Vocabulary. The students perceive that using Total Physical Response (TPR) method is more effective than using the conventional method. They feel that use the TPR method is more fun and exciting. They can feel the progress of mastering the English vocabulary. Then the quantitative data shows that the result in Post-Test Activity 1 in Controlled Class shows that there is an increase from the Pre-Test. In Pre-Test, the average is 61,7 that belongs to Enough category, then in Post-Test Activity 1, the average is 66,1 (Enough Category). Then in a Post-Test Activity 2, the average result is 67,8 (Enough category). We can conclude that in Controlled Class that uses the conventional method still has a progression toward the vocabulary achievement but it is really hard or not significant. The result in Post-Test Activity 1 in Experimental Class shows that there is an increase from the Pre-Test, it is from 66,9 (Pre-Test) to 74,4 (Post-Test Activity 1). It is a proofed that there is increase of 7.5 point (from Pre-Test to Post-Test Activity 1), it is more effective than we use the conventional method that only increase 4.4 point. It happens also in the Post-Test Activity 2 in Experimental Class, there is an increase 6.2 point (from Post-Test Activity 1 to Post-Test Activity 2). It is more effective than we use conventional method that only increases 1.7 point (from Post-Test Activity 1 to Post-Test Activity 2).
AN INVESTIGATION OF TEACHERS APPROACHES EMPLOYED IN TEACHING THE ENGLISH LITERATURE: OBSERVATION OF EFL CLASSROOM AT SMK PURNAMA WONOSOBO Salsabila, Annisa; Sahid, Sahid
CLLiENT (Culture, Literature, Linguistics, and English Teaching) Vol 6 No 1 (2024): CLLiENT JOURNAL
Publisher : Language and Literature Faculty, Universitas Sains Al-Qur'an (UNSIQ) Jawa Tengah di Wonosobo

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

Abstract

This article presents an investigation into the approaches employed by teachers when teaching English literature in EFL (English as a Foreign Language) classrooms. The study aims to explore the instructional strategies utilized by teachers and their potential impact on student engagement and comprehension. Through systematic observations conducted within authentic classroom settings, this research provides valuable insights into effective pedagogical practices for teaching English literature in an EFL context. However, there is limited research specifically focusing on teacher approaches within EFL classrooms when it comes to teaching English literature. To address this gap, qualitative methods were employed with naturalistic observations carried out in multiple EFL classrooms. The expected findings shed light on various instructional techniques employed by teachers while teaching English literature topics in EFL contexts. These may include close reading exercises, group discussions, and integration of multimedia resources to facilitate interactive learning experiences related to English literature. By investigating these approaches through observation-based research methods, this study contributes to the existing body of knowledge regarding effective pedagogy for teaching English literature in an EFL setting. Overall, this investigation emphasizes the importance of understanding teacher approaches when delivering instruction on English Literature for learners studying it as a foreign language. It serves as a resourceful guide for educators aiming to optimize student engagement and comprehension levels while fostering appreciation for literary works across cultures within an EFL classroom.
THE IMPLEMENTATION OF THE SILENT WAY METHOD TO INCREASE STUDENTS’ ENGLISH VOCABULARY IN SMPN 3 SUKOHARJO Saputri, Sukma Ajeng Damar; Sahid, Sahid
CLLiENT (Culture, Literature, Linguistics, and English Teaching) Vol 6 No 2 (2024): CLLiENT JOURNAL
Publisher : Language and Literature Faculty, Universitas Sains Al-Qur'an (UNSIQ) Jawa Tengah di Wonosobo

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

Abstract

This study aimed to improve the vocabulary skills of 8th-grade students at SMP Negeri 3 Sukoharjo using the Silent Way method. The research adopted a Classroom Action Research (CAR) design, conducted over two cycles during the 2023/2024 academic year. The sample consisted of one randomly selected class from the 8th grade, and data were collected using a mixed-method approach, including interviews, observations, field notes, and tests. The pre-test and post-test scores were used to measure the effectiveness of the intervention. The study concluded that the Silent Way method effectively enhances vocabulary acquisition by engaging students and fostering active participation. These findings suggest that innovative, student-centered teaching methods can significantly improve language learning outcomes. Further research is recommended to explore the long-term effects of such methods on vocabulary retention and overall language proficiency.
Sensitivity Analysis of Digital Elevation Model In The Use of Hydrological Applications Sahid, Sahid; Ihsan, Haikal Muhammad; Saefulloh, Muhammad Abia; Ulhaq, Wiedad Diya
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22449

Abstract

Assessing DEMs is a critical step in hydrological applications to reduce uncertainties. This study assesses the uncertainty level of using several DEM products by comparing the derivation of watershed morphometric information in the form of hydrological boundaries, river flow networks, and meeting points between river networks. This research assessed three DEM products, namely SRTM, ASTER GDEM, and NASADEM, with the topographic map as reference data for product assessment. The evaluation is based on two criteria: DEM product assessment and morphometric extraction. The second criterion assessment compared river morphometry products from several parameters, including watershed area, river network density, and river network meetings. The analysis results showed that in the first criterion, the NASADEM product was the product with the closest RMSE and PBIAS values to the reference data. Further assessment of river morphometry products shows that the ASTER GDEM watershed area parameter has the closest area value. In the horizontal accuracy parameter of river network products, NASADEM has the smallest average error value. Furthermore, in the accuracy assessment in determining the meeting between tributaries and the main river and the density of river flow, SRTM is the closest compared to other DEM products. The vertical and horizontal accuracy of DEM must be considered before using in hydrologic applications.
PENGARUH PEMBELAJARAN BERDIFERENSIASI TERHADAP HASIL BELAJAR MATEMATIKA DITINJAU DARI MOTIVASI BELAJAR SISWA Sahid, Sahid; Hamda, Hamda; Sumarni, Sumarni
Pedagogy: Jurnal Pendidikan Matematika Vol. 10 No. 4 (2025): Pedagogy : Jurnal Pendidikan Matematika
Publisher : Universitas Cokroaminoto Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30605/pedagogy.v10i4.7301

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh pembelajaran berdiferensiasi terhadap hasil belajar matematika ditinjau dari motivasi belajar siswa. Menggunakan desain quasi-experimental dengan model pre-test post-test control group, sampel penelitian terdiri atas dua kelas VIII di SMPN 4 Bangkala Barat yang dipilih secara cluster random sampling. Hasil analisis menunjukkan tidak terdapat interaksi antara pembelajaran dan motivasi belajar terhadap hasil belajar. Namun, baik siswa dengan motivasi tinggi maupun rendah menunjukkan hasil belajar matematika yang lebih tinggi ketika diajar menggunakan pembelajaran berdiferensiasi dibandingkan dengan pembelajaran konvensional. Secara keseluruhan, pembelajaran berdiferensiasi terbukti lebih efektif dalam meningkatkan hasil belajar matematika.
GAMBARAN KEMAMPUAN BERPIKIR REFLEKTIF SISWA DENGAN GAYA KOGNITIF FIELD DEPENDENT Asyari, Syahrullah; Sahid, Sahid; Nuraliyah, Ahmida
Pedagogy: Jurnal Pendidikan Matematika Vol. 10 No. 4 (2025): Pedagogy : Jurnal Pendidikan Matematika
Publisher : Universitas Cokroaminoto Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30605/pedagogy.v10i4.7325

Abstract

Penelitian ini bertujuan untuk mengetahui kemampuan berpikir reflektif siswa yang memiliki gaya kognitif field dependent. Penelitian ini adalah penelitian deskriptif dengan pendekatan kualitatif, subjek penelitian sebanyak dua siswa Kelas VIII B4 SMP Buq’atun Mubarakah yang dipilih dengan teknik purposive sampling. Instrumen yang digunakan dalam penelitian ini terdiri atas instrumen utama, yaitu peneliti, dan instrumen pendukung meliputi tes gaya kognitif, tes kemampuan berpikir reflektif, dan pedoman wawancara. Teknik analisis data dalam penelitian ini mengikuti alur kondensasi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian menunjukkan bahwa subjek dengan gaya kognitif field dependent mampu memenuhi tiga dari lima indikator kemampuan berpikir reflektif, yaitu: mengumpulkan seluruh informasi yang diperlukan untuk menyelesaikan masalah, menemukan ide yang pertama kali muncul setelah memahami masalah, dan mengembangkan kemungkinan solusi dari informasi yang diperoleh. Penelitian ini memberikan kontribusi baru dengan mengungkap secara mendalam karakteristik kemampuan berpikir reflektif siswa bergaya kognitif field dependent pada konteks pemecahan masalah geometri, yang sebelumnya jarang dikaji secara terpisah dari gaya kognitif lainnya.
Co-Authors Abdul Rahman Achmad Widodo Adiprimaswara, Michael Putra Narendra Afsari, Ayudya Aldyfra Luhulima Lukman Alfauzi, Abdul Syukur Alyasa, Moh. Fani Anandia, Faranita Putri Andi Wahyudi Anis Roihatin Arif Fauzi, Dhiyaulhaq Ariyanto, Wahyu Arrahman, Friendika Alif Asferizal, Ferial Atthariq, Luthfi Aryananda Aukad, Muhamad Aulia, Nur Fatowil Badaruddin, Sukri Barid, Muhammad Bernard Bernard, Bernard Chatarina Umbul Wahyuni Darlan, Armayanti Devi, Yunida Djam'an, Nurwati Dwiana Hendrawati F. Gatot Sumarno, F. Gatot Fahmi, Aziz Fauziah, Selma Nurul Ferial, Asferizal Fitriana, Indri Rahmandhani Gatot Yulianto Hamda, Hamda Hassan, Muhammad Nasiru Hermawan, Baktiyar Mei Ihsan, Haikal Muhammad Indrarani, Indri Astrina Fitria Kusriyah, Ainun Jariyah Dewi Kuswari Hernawati M Gilang Indra Mardika Mar Athul Wazithah T. Maulani, Choirunnisa Prilya Maulidina, Fathiya Nur Mochammad Denny Surindra Muhammad Ammar Naufal Muhammad Rifki Mulyono Mulyono Munawwaroh, Dita Anies Musdalifah Musdalifah Mustofa, Rida Mutmainnah, Fakhirah Nadia, Aulia Nana Putri Yanto Nancy Y Nugroho Nasir, Nur Anisa Nur Sakinah Nuraliyah, Ahmida Nurdin Arsyad, Nurdin Nurhaliza, Ratih Nurhidayah Nurhidayah Nursadi, Nursadi Nurwijayanti Pratiwi, Okta Ayu Priscila, Anastasia Julia Putra, Riyan Hari Putri, Tania Prameswari Rahma Yanda Rahma, Nur Ratna Tri Hardaningtyas, Ratna Tri Rofik, Abdur Rosidah Rosidah Sa'diyyah, Fadhilah Nur Saefulloh, Muhammad Abia Safaruddin, Yanuar Mahfudz Safarudin, Yanuar Mahfud Safitri, Ayuun SALSABILA, ANNISA Saputra, Dwiki Mifta Saputri, Sukma Ajeng Damar Sari, Shaufa Salsabila Sofiani, Gizella Sri Andayani Sufia, Sufia Sugeng Widada Sulistyoningtyas, Dian Lestari Sumarni Sumarni Supriyo Supriyo Syahrullah Asyari, Syahrullah Syukry, Zein Akbar Tantri, Riris Annisa Tarra Totok Prasetyo Udi Harmoko Ulhaq, Wiedad Diya Usman Mulbar Utomo, Bagus Wahyu Wattimena, Christopher Johanes Edsel Wiedad, Diyaulhaq Wildana Wildana, Wildana Wulandari, Reski Yusuf Dewantoro Herlambang