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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) International Journal of Renewable Energy Development POSITRON Jurnal Sains dan Pendidikan Fisika Jurnal Ilmu Ternak Veteriner WARTAZOA Indonesian Bulletin of Animal and Veterinary Sciences PROFIT : Jurnal Administrasi Bisnis Jurnal Fisika Unand JFA (Jurnal Fisika dan Aplikasinya) PROSIDING SEMINAR KIMIA Jurnal Fisika FLUX JURNAL BIOLOGI INDONESIA International Research Journal of Business Studies (E-Journal) Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Indonesian Journal of Electrical Engineering and Computer Science Edunesia : jurnal Ilmiah Pendidikan Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Makara Journal of Science Sewagati Jurnal Akuntansi Manado (JAIM) International Research Journal of Business Studies Journal of Engineering and Technological Sciences
Darminto .
Dept. Of Physics, Fac. Of Math. And Natural Sciences-Sepuluh November Institute Of Tech. Surabaya Kampus ITS Sukolilo, Surabaya 60111, Indonesia
Aerospace Engineering Arts Humanities 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 Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Veterinary Other

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Analysis of glucomannan molecule in Porang (Ammorphophallus Muelleri Blume) flour using nuclear magnetic resonance Rizoputra, Ivan; Wahyudi, Sriati; Puspita, Niniek Fajar; Risdiana, Risdiana; Darminto, Darminto
Jurnal Fisika dan Aplikasinya Vol 20, No 3 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v20i3.21753

Abstract

The porang tuber (Ammorphophallus Muelleri Blume) is a bulb plant belonging to the Araceae family, which contains the polysaccharide substance of glucomannan. In this work, the porang flour has been purified from tubers by a centrifugation method. To study the content of compounds and types of molecules that make up glucomannan, characterization was carried out using 1H and 13C nuclear magnetic resonance (NMR). The analysis on chemical shift data from both NMR spectra can be concluded that glucomannan in porang is more dominantly constructed by glucose molecules rather than mannose. From these results, it is also known that the toxic compound Ca-oxalate which is part of the porang compound has been reduced during the centrifugation process.
Optimizing carrier transport properties in the intrinsic layer of a-Si single and double junction solar cells through numerical design Prayogi, Soni; Hamdani, Dadan; Darminto, Darminto
Indonesian Journal of Electrical Engineering and Computer Science Vol 37, No 1: January 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v37.i1.pp69-77

Abstract

This research aims to improve the performance of a-Si: H solar cells, particularly in terms of carrier transport properties, through a numerical design approach utilizing AFORS-HET simulation software. By performing a series of rigorous computer simulations, we explore the potential regulation of the intrinsic layer thickness, carrier mobility, loading factor, and density of states (DoS) distribution in the solar cell's intrinsic layer. Recombination losses are reduced, and light absorption efficiency is significantly increased when the intrinsic layer thickness is adjusted, as shown by simulation findings. Moreover, reduction of transit times and enhancement of the total efficiency of the solar cells depend on increased carrier mobility. Parameters can be adjusted to attain optimal performance under various operating situations by adjusting the DoS and load factors. Furthermore, the simulations provide insightful information about the interactions between the junctions in solar cells with double junctions. Our results of this research provide an important contribution to efforts to develop more efficient and sustainable a-Si: H solar cells and emphasize the importance of numerical design approaches in photovoltaic technology.
Investigation of Reaction Dynamics of Methane Reforming on Nickel Clusters Using Molecular Dynamics Simulations Arifin, Rizal; Muzakki, Fikrun Najib; Winardi, Yoyok; Widaningrum, Ida; Zulkarnain, Zulkarnain; Abdurrouf, Abdurrouf; Johari, Norhasnidawani; Lee, Vannajan Sanghiran; Darminto, Darminto
Journal of Engineering and Technological Sciences Vol. 57 No. 1 (2025): Vol. 57 No. 1 (2025): February
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.1.5

Abstract

This study employed molecular dynamics simulations utilizing the ReaxFF force field to elucidate the mechanisms underlying methane decomposition and hydrogen generation on nickel clusters (Ni37, Ni55, and Ni80). The transformation of methane into valuable products, including carbon species and hydrogen molecules, is of considerable significance owing to the abundance of methane and its potential role as an atmospheric pollutant. The findings suggest that Ni37 clusters had the highest initial reactivity, although they deactivated swiftly; conversely, Ni55 and Ni80 exhibited more consistent reaction rates. The highest efficiency of hydrogen production per unit surface area was displayed by Ni55 clusters within 100,000 fs, demonstrating a balance between reactivity and stability. Methane dissociation on the Ni55 clusters occurred in multiple stages. Two distinct mechanisms for hydrogen formation were identified: simultaneous dissociation from methane and migration and the combination of hydrogen atoms on the cluster surface. Ni55 showed a substantially lower activation energy for methane dissociation at 0.5 eV than bulk nickel, suggesting a higher degree of reactivity. Conversely, the activation energy for hydrogen formation was 1.1 eV. These results highlight the potential of the Ni55 clusters as effective catalysts for hydrogen production and methane conversion
Electronic properties of amorphous silicon carbon are correlated with the methane flow rate Prayogi, Soni; Cahyono, Yoyok; Darminto, Darminto
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i1.pp530-537

Abstract

This study examines how methane flow rate during the plasma-enhanced chemical vapor deposition (PECVD) process affects the electronic properties of amorphous silicon-carbon (a-SiC) thin films. The films were deposited with varying methane flow rates, and their structural and electronic properties were analyzed using spectroscopic ellipsometry and atomic force microscopy (AFM). Results show that the methane flow rate influences the ratio of sp2 to sp3 carbon bonding, which impacts the material's electronic band structure. Higher methane flow rates increase sp2 carbon content, reducing the bandgap energy and enhancing electrical conductivity. In contrast, lower flow rates lead to higher sp3 bonding, wider band gaps, and decreased conductivity. This study highlights the potential for optimizing methane flow rates in PECVD to tailor the electronic properties of a-SiC films for specific applications. The findings offer valuable insights for designing and optimizing a-SiC materials for electronic devices. Future research will investigate how other deposition parameters and post-deposition treatments affect a-SiC's electronic properties, aiming to further improve material performance for advanced technological applications.
Effective Teaching Strategies to Enhance Critical Thinking Skills in Education: A Literature Review Darminto, Darminto; Handoyo, Eko; Wardani, Sri; Subali, Bambang; Widiarti, Nuni
Edunesia : Jurnal Ilmiah Pendidikan Vol. 6 No. 2 (2025)
Publisher : research, training and philanthropy institution Natural Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51276/edu.v6i2.1227

Abstract

Critical thinking skills are essential in modern education and are important in sound decision-making and problem-solving. Therefore, effective teaching in developing students' critical thinking skills must be taken seriously. This article aims to review various effective teaching strategies in improving critical thinking skills at different levels of education. This research uses a literature study approach by analyzing recent articles discussing teaching methods, focusing on developing critical thinking. Based on the literature review conducted, it was found that methods such as Problem-Based Learning (PBL) and inquiry-based learning (IBL) proved to be very effective in improving critical thinking skills. PBL, which encourages students to solve real problems in groups, provides hands-on experience in critical thinking. In addition, IBL teaches students to ask questions and explore answers independently and actively. Both methods improve students' analytical and evaluative skills at primary and tertiary education levels. However, challenges in implementation include the need for ongoing training for educators and limited resources. In conclusion, teaching based on these methods effectively improves students' critical thinking skills and prepares them to face the challenges of the complex world of work.
Analisis Keputusan Pendanaan Investasi: Studi Kasus di Perusahaan Penggemukan Sapi Indonesia Nurshabrina, Atiqa Taqiyya; Darminto, Darminto
Jurnal Akuntansi Manado (JAIM) Volume 5. Nomor 1. April 2024
Publisher : Fakultas Ekonomi Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/jaim.vi.8235

Abstract

Penelitian ini bertujuan untuk memberikan rekomendasi keputusan pendanaan terkait investasi PT PSI berupa penambahan feedlot di Bogor karena perusahaan belum memiliki modal yang cukup sehingga berakibat pembangunan feedlot terhambat. Untuk mencapai tujuan, penelitian dilakukan dengan menggunakan strategi studi kasus dengan data diperoleh dari dokumentasi dan wawancara serta diolah menggunakan descriptive qualitative analysis. Berdasarkan simulasi dan asumsi yang digunakan dalam penelitian ini, disimpulkan bahwa struktur modal PT PSI saat ini dengan 72% pendanaan utang belum optimal karena struktur modal yang optimal adalah 25%-35% pendanaan utang. Rekomendasi tindakan yang dapat dilakukan PT PSI adalah menyesuaikan struktur modal agar optimal dengan meningkatkan modal pemegang saham minimal 61 kali dari saldo saat ini. Penelitian ini mengisi celah dari penelitian terdahulu, yaitu penelitian ini menggunakan pendekatan untuk perusahaan tertutup, di mana  berbeda dengan penelitian terdahulu yang didominasi oleh lingkup perusahaan publik, dan mempertimbangkan faktor yang belum dipertimbangkan pada penelitian terdahulu, seperti biaya kebangkrutan dan makroekonomi.
Faktor-faktor yang Mempengaruhi Kebijakan Dividen Darminto, Darminto
Profit: Jurnal Adminsitrasi Bisnis Vol. 2 No. 1 (2008): Profit : Jurnal Administrasi Bisnis
Publisher : FIA UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (117.577 KB)

Abstract

This research is including research type of explanatory to explain significance influence fromReturn on Investment ( ROI), Cash ratio ( CR), debt to equity ratio ( DER), Equity to toTalAssets ratio ( ETAR), Growth Sales ( GS), Firm Size ( SIZE) and Earning per Share ( EPS )to Dividen Per Share ( DPS ). Based on coefficient value obtained from equation analysis ofmulti linear regression is concluded variable ROI, CR, DER, ETAR, GS, SIZE and PES, insimultance has influence signifikan to variable Dividen Per Share ( DPS). Based oncoefficient value obtained from probability value ( Sig-F) 0,000 at level  = 0,05 ( 0,000 <0,05). Coefficient value R Square = 0,603 showing various DPS value change explained byindependent variable in simultance 60,3 % while rest is 39,7 % explained by other variablewhich outside seven accurate independent variables. Influence ROI to Dividen Per Sharesignificance at level  = 0,05 with probability value 0,039. Influence Cash ratio to DPS withprobability value 0,044. Influence DER with probability value 0,008. Influence ETAR to DPSwith probability value 0,007. Influence Growth Sale to DPS with probability value 0,006.Influence Firm Size to DPS with probability value 0,028. Influence EPS to DPS withprobability value 0,000. Dominant variable had an effect on to DPS is variable GS withregression coefficient value ( b) 63,185. From seventh of independent variable that isaccurate, GS is variable that is most dominant influences level of DPS.Keyword : Return on Investment (ROI), Cash Ratio (CR), Debt to equity Ratio (DER), Equity toTotal Assets Ratio (ETAR), Growth Sales (GS), Firm size (SIZE). Earning per Share(EPS), Dividen Per Share (DPS).
PENGARUH ASPEK FUNDAMENTAL DAN RISIKO BISNIS TERHADAP FINANCIAL LEVERAGE (Studi pada Perusahaan Manufaktur Sektor Aneka Industri di BEI Periode Tahun 2007 – 2011) Sultera, Fatimah Karunia; Suhadak, Suhadak; Darminto, Darminto
Profit: Jurnal Adminsitrasi Bisnis Vol. 6 No. 2 (2012): Profit : Jurnal Administrasi Bisnis
Publisher : FIA UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (175.131 KB)

Abstract

Tujuan penelitian yaitu menganalisis dan menjelaskan pengaruh negatif ukuran perusahaan, struktur aktiva, return on assets (ROA), current ratio (CR) dan risiko bisnis terhadap debt to assets ratio (DAR) serta menganalisis dan menjelaskan variabel yang pengaruhnya paling dominan terhadap debt to assets ratio (DAR) diantara variabel ukuran perusahaan, struktur aset, return on assets (ROA), current ratio (CR) dan risiko bisnis. Populasi penelitian yang digunakan seluruh perusahaan manufaktur yang bergerak di sektor aneka industri dan terdaftar di Bursa Efek Indonesia (BEI) selama tahun 2007-2011 dengan total sampel berjumlah 20 perusahaan. Hasil analisis data pada uji F membuktikan bahwa secara simultan variabel independen (Ukuran Perusahaan (X1), Struktur Aktiva (X2), Current Ratio (X4), dan Risiko Bisnis (X5)) berpengaruh signifikan terhadap Debt to Assets Ratio (Y). Pengujian secara parsial (Uji t) membuktikan bahwa Struktur aktiva (X2), Current ratio (X4) dan Risiko bisnis (X5) secara parsial berpengaruh signifikan negatif terhadap variabel DAR (Y). Sedangkan, Ukuran perusahaan (X1) dan Return on assests (X3) secara parsial tidak berpengaruh signifikan terhadap variabel DAR (Y).Variabel bebas yang paling dominan pengaruhnya terhadap variabel terikat (debt to assets ratio / DAR) adalah Current ratio (X4).   Kata kunci : ukuran perusahaan, struktur aktiva, return on assets, current ratio, risiko bisnis and debt to assets ratio.
ANALISIS FAKTOR MIKRO TERHADAP STRUKTUR MODAL DAN NILAI PERUSAHAAN (STUDI PADA PERUSAHAAN NON-BANK YANG TERDAFTAR DI BURSA EFEK INDONESIA INDEKS LQ 45 PERIODE 2009-2011) Septiono, Rizqy Wahyu; Suhadak, Suhadak; Darminto, Darminto
Profit: Jurnal Adminsitrasi Bisnis Vol. 7 No. 1 (2013): Profit : Jurnal Administrasi Bisnis
Publisher : FIA UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (148.334 KB)

Abstract

ABSTRAK Tujuan penelitian yaitu, (1) menganalisis dan menjelaskan pengaruh variabel ukuran perusahaan, profitabilitas dan likuiditas terhadap variabel struktur modal perusahaan, (2) untuk menganalisis dan menjelaskan pengaruh variabel ukuran perusahaan, profitabilitas dan likuiditas terhadap variabel nilai perusahaan, (3) untuk menganalisis dan menjelaskan pengaruh variabel struktur modal terhadap variabel nilai perusahaan. Populasi penelitian yang digunakan meliputi perusahaan non-bank yang terdaftar di Bursa Efek Indonesia Indeks LQ 45 selama tahun 2009 hingga tahun 2011 dengan total sampel berjumlah 14 perusahaan. Data yang diperoleh dianalisis dengan menggunakan Partial Least Square (PLS). Hasil analisis data membuktikan bahwa (1) variabel ukuran perusahaan, profitabilitas, dan likuiditas berpengaruh secara signifikan terhadap variabel struktur modal, (2) variabel ukuran perusahaan, profitabilitas berpengaruh secara signifikan terhadap variabel nilai perusahaan, sedangkan variabel likuiditas diperoleh hasil yang tidak signifikan pengaruhnya terhadap variabel nilai perusahaan, (3) variabel struktur modal berpengaruh secara signifikan terhadap variabel nilai perusahaan.   Kata kunci: faktor mikro perusahaan, ukuran perusahaan, profitabilitas, likuiditas, struktur modal dan nilai perusahaan.   ABSTRACT The objectives of this research are (1) to analyze and explain the effect of following variables on company’s capital structure: company size, profitability, and liquidity (2) to analyze and explain the effect of following variables on company’s value: company size, profitability, and liquidity (3) to analyze and explain the effect of company’s capital structure on company’s value. The population used on this research including non-bank companies listed on Indonesian Stock Exchange Index LQ 45 in the period 2009-2011 with total sample of 14 companies. The data are analyzed by using Partial Least Square (PLS) method. Analysis result proves that (1) company size, profitability, and liquidity significantly affect company’s capital structure, (2) company size, profitability significantly affect company’s value, while liquidity variable does not bring any significant effect (3) capital structure significantly affect a company’s value. Keywords: micro factors of company, company size, profitability, liquidity, capital structure, and company’s value.
PENGARUH VARIABEL MAKRO EKONOMI TERHADAP INDEKS HARGA SAHAM GABUNGAN DAN RETURN NAB REKSA DANA SAHAM (STUDI PADA REKSA DANA SAHAM YANG TERDAFTAR DI BAPEPAM PERIODE 2008- 2012) Trivena, Shinta Maharani; Suhadak, Suhadak; Darminto, Darminto
Profit: Jurnal Adminsitrasi Bisnis Vol. 7 No. 2 (2013): Profit : Jurnal Administrasi Bisnis
Publisher : FIA UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9.869 KB)

Abstract

Penelitian ini adalah eksplanatory research. Pengambilan sampel dengan metode purposive sampling. Terdapat 20 produk Reksa Dana Saham dalam penelitian ini. Metode analisis data menggunakan analisis jalur (Path Analysis). Hasil analisis data menunjukkan bahwa (1) variabel tingkat inflasi adalah tidak signifikan pengaruhnya terhadap Indeks Harga Saham Gabungan, (2) variabel nilai tukar adalah signifikan pengaruhnya terhadap Indeks Harga Saham Gabungan, (3) variabel tingkat suku bunga SBI adalah signifikan pengaruhnya terhadap Indeks Harga Saham Gabungan, (4) variabel harga minyak dunia tidak signifikan pengaruhnya terhadap Indeks Harga Saham Gabungan, (5) variabel harga emas dunia tidak signifikan pengaruhnya terhadap IHSG, (6) variabel tingkat inflasi tidak signifikan pengaruhnya terhadap return NAB Reksa Dana Saham, (7) variabel nilai tukar adalah tidak signifikan pengaruhnya terhadap return NAB Reksa Dana Saham, (8) variabel tingkat suku bunga SBI tidak signifikan pengaruhnya terhadap return NAB Reksa Dana Saham, (9) variabel harga minyak dunia signifikan pengaruhnya terhadap return NAB Reksa Dana Saham, (10) variabel harga emas dunia tidak signifikan pengaruhnya terhadap return NAB Reksa Dana Saham (11) variabel Indeks Harga Saham Gabungan signifikan pengaruhnya terhadap return NAB Reksa Dana Saham.   Kata kunci: Variabel Makro Ekonomi, tingkat inflasi, nilai tukar, tingkat suku bunga SBI, harga minyak dunia, harga emas dunia, Indeks Harga Saham Gabungan, return NAB Reksa Dana Saham.   This study is explanatory research. Sampling was taken by purposive sampling method, There are 20 product of Equity Fund in this study.The data analized by using path methods. Analysis result proves that (1) inflation rate does not bring any significant effect on Indonesia Composite Index, (2) exchange rate significantly effect on Indonesia Composite Index, (3) interest rate of SBI significantly effect on Indonesia Composite Index, (4) world oil price does not significantly effect on Indonesia Composite Index, (5) price of gold does not bring any significant effect on Indonesia Composite Index, (6) inflation rate does not bring any significant effect on return of NAV Equity Fund, (7) exchange rate does not bring any significant effect on returns of NAV Equity Fund, (8) interest rate of SBI does not bring any significant effect on return of NAV Equity Fund, (9) world oil price significantly effect on return of NAV Equity Fund, (10) gold price does not bring any significant effect on return of Equity Fund, (11) Indonesia Composite Index significantly effect on return of NAV Equity Fund. Keywords:  Macroeconomic variables, inflation rate, exchange rate, interest rate of SBI, world oil prices, gold prices, Indonesia Composite Index, return of NAV Equity Funds.
Co-Authors A Ratnawati A Wiyono abdurrouf Abdurrouf Adler Haymans Manurung Agung Suwandaru Agus Wiyono Ahzan, Sukainil Alimuddin Ali Anne Zulfia Arifin, Rizal Bambang Subali Budhi Priyanto Budi Priyanto Cahyoingrat, Suryo E. Cahyono, Yoyok D.A Hewajuli Dadan Hamdani, Dadan Daniels, Peter Daniels, Peter Dedi Supriadi Dharmayanti, N.L P.I. Dharmayanti, N.L P.I. Dharmayanti, NLP Dharmayanti, NLP Eddy S Siradj Eko Handoyo Endang Siti Astuti Endhah Purwandari Fahmi Astuti, Fahmi Fatimah Karunia Sultera Field, Hume Field, Hume Firdaus, Aulia Anisa Gatut Yudoyono H Hamid Haniffudin Nurdiansah Hartawan, R. Hartawan, R. Helmy Hamid Hesti Irnanta Hewajuli, D.A. Hewajuli, D.A. I Wayan T. Wibawan Ida Ayu Putu Sri Widnyani Ida Widaningrum, Ida Indrawati Sendow Intifadhah, Sahara Hamas Iwan Dini Iwan Yahya Jagoda Ignjatovic Johari, Norhasnidawani Joni Dwi Pribadi Kholis Nurhanafi Kolif Yulianto L Parede Lee, Vannajan Sanghiran Lintang Edityastono Malik Anjelh Baqiya Manik, Tetti Novalina Martin Malole Mashuri Mashuri Mochammad Zainuri Morrissy, Chris Morrissy, Chris Muhammad Taqiyuddin Muhammad Zainuri Muharam Saepulloh Munir, Rahmawati Muzakki, Fikrun Najib N. Suryana N.L.P Indi Dharmayanti N.L.P.I Dhamaryanti N.L.P.I Dharmayanti N.L.P.I. Dharmayanti Ninis Hadi Haryanti, Ninis Hadi NLP Indi Dharmayanti Nugroho, Ferry Anggoro Ardy Nuni Widiarti Nurma Sari, Nurma Nurshabrina, Atiqa Taqiyya P Ronohardjo Prayogi, Saiful Prayogi, Soni Puspita, Niniek Fajar R Damayanti R Indriani R M A Adjid R. Indriani R.M Abdul Adjid R.M. Abdul Adjid R.M.A. Adjid Ratnawati, A. Ratnawati, A. Retno Asih, Retno RISA INDRIANI Risa Indryani Risdiana, Risdiana Rizoputra, Ivan Rizqy Wahyu Septiono S Hardjoutomo Saleh, Muh Santoso, Tanto Budi Shaliha, Shaliha Shinta Maharani Trivena Sholih, Ahmad Simon Sadok Siregar, Simon Sadok Simson Tarigan Siti Ragil Handayani Sitorus, Mido Ester Sjamsul Bahri SRI WARDANI Suarso, Eka Suhadak Suhadak Suminar Pratapa Suryajaya Suryajaya, Suryajaya Susan M Noor Susi Soviana T Sjafriati T Syafriati Taher Al habsji Tatty Syafriati Totok Wianto Upik Kesumawati Hadi W. Asmara W. T. Artama, W. T. Wahyudi, Sriati Winardi, Yoyok Zainul Arifin Zainuri, M Zulkarnain, Zulkarnain