Synthesis of Hydroxyapatite from Green Mussel Shells Using Micro-wave Method Through Ultrasonic Mixing Process and Magnetic Stirrer Stirring
(Agus Prasetyo, Risky Ismail, A. P. Bayuseno, Samsudin Anis, Deni Fajar Fitriyana, Muhammad Afrizal, Januar Parlaungan Siregar)
DOI : 10.15294/jbat.v14i1.25497
- Volume: 14,
Issue: 1,
Sitasi : 0 01-Jul-2025
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| Last.10-Jul-2025
Abstrak:
Hydroxyapatite (HAp) is a biomaterial containing calcium phosphate with the chemical formula which is similar to the structure of human bone, so it is good for the purpose of healing human bones and teeth. HAp synthesis has several methods that can affect the results of HAp synthesis, such as the method of mixing CaO with phosphate, namely mixing with ultrasonic machines and magnetic stirrers. However, the discussion about the difference of HAp results with the mixing method of ultrasonic machine and magnetic stirrer is still rarely done. Therefore, it is important to examine and compare the characteristics of HAp synthesized by ultrasonic and magnetic stirrer mixing. The result of XRD test shows that HA1 has a purity of weight percentage (wt.%) of HAp crystal of 99.8%, while HA2 has a weight percentage (wt.%) of HAp crystal of 97.7%. For the FTIR test results of both specimens detected the presence of phosphate groups, and hydoxide, where both are the basic form of hydroxyapatite. Carbonate groups were also detected in the test, but it cannot be said to be bad because carbonate is a natural substitute for phosphate.
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2025 |
Analisis Data Turbin Angin Bilah Taper di Pantai Payangan, Sumberejo, Kec. Ambulu, Jember
(Muhammad Eka Rizky, Muhamad Auriel Langit R, Naka Sabda Pratama, Andi Bagus Prasetyo, Juliawan Tri Andika P, Bintang Marchegianno R, Mico Syah Putra, Firdaus Afiyata M, Sena Adi S, Dito Pramudya N, Asbi Solihin, Thoriqur Rahman, Angga Maufirotus)
DOI : 10.61132/venus.v2i6.670
- Volume: 2,
Issue: 6,
Sitasi : 0 28-Dec-2024
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| Last.06-Aug-2025
Abstrak:
The largest source of energy currently utilized is still predominantly from fossils. Fossil energy sources are non-renewable so over time they will run out. So it is necessary to utilize renewable energy sources. One renewable energy source that is environmentally friendly and easy to obtain is wind energy. Wind is a collection of air that is experiencing movement due to a difference in pressure on the earth's surface. Wind will move from areas of high pressure to areas of lower pressure. Experimental research on wind energy is a useful energy that can be put to good use. Wind energy is a form of energy that comes from utilizing air flow in the atmosphere to produce mechanical or electrical energy. The main technology used to utilize wind energy is a wind turbine, which converts wind kinetic energy into electrical energy through a generator. Which of course also requires sufficient wind speed so that the wind turbine can rotate and produce mechanical movement in the form of rotational torque which can then be converted into electrical energy. Wind energy has great potential as a clean, sustainable and environmentally friendly resource, as it does not produce greenhouse gas emissions or hazardous waste during its operation. However, wind energy development faces challenges such as fluctuations in wind speed, large land requirements, visual impacts, and potential disruption to local ecosystems. With technological innovation and careful planning, wind energy can be a significant solution to meet global energy needs in a sustainable manner.
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2024 |
Peran electronic word of mouth pada umkm exclusive hand-bouquet and sash Asagift.Id Semarang
(Widiyanti Widiyanti, Ratna Tunjungsari, Agus Prasetyo)
DOI : 10.26623/jreb.v17i2.8793
- Volume: 17,
Issue: 2,
Sitasi : 0 30-Aug-2024
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| Last.09-Jul-2025
Abstrak:
<p>Era teknologi berkembang pesat dengan segala aspek didalamnya yang selalu <em>update </em>dan syarat persaingan mengharuskan pelaku bisnis senantiasa inovatif dan kreatif mampu melihat setiap peluang usaha. <em>Exclusive Hand-Bouquet and Sash</em> Asagift.id berusaha memaksimalkan peranan <em>d</em><em>igital marketing</em> dalam menjalankan usaha dan berupaya menyelaraskan dengan prinsip pasar modern dalam rangka memenangkan persaingan. Pemanfaatan <em>digital marketing</em> notabene selain dapat menjangkau pasar yang lebih luas dan mampu mendukung efisiensi biaya pemasaran, juga membuat ruang dan waktu pemasaran tidak terbatas. Selain itu <em>digital marketing </em>bersifat <em>real time</em>, sehingga pelaku bisnis dapat langsung memperhatikan minat dan <em>feed back </em>dari pasar yang dituju. Era kehidupan modern yang dinamis dan menjadikan efektif dan efisien menjadi <em>passion</em>, didukung kemudahan akses diberbagai pemenuh kebutuhan selaras dengan peran E-WOM yang membantu proses pihak-pihak yang terlibat didalamnya. Metode penelitian menggunakan metode kualitatif dengan desain penelitian <em>case study</em> tunggal. Pengumpulan data dilakukan pada <em>participant observation</em>, <em>indepth interview</em> dan dokumentasi. Analisis data yaitu <em>data reduction, data display </em>dan<em> conclusion</em><em> drawing</em>. Uji kredibilitas data dengan triangulasi dan <em>member check</em>.</p><p><em>The technological era is developing rapidly with all aspects of it always being updated and competitive conditions require business people to always be innovative and creative and able to see every business opportunity. Exclusive Hand-Bouquet and Sash Asagift.id tries to maximize the role of digital marketing in running a business and strives to align with modern market principles in order to win the competition. In fact, the use of digital marketing can not only reach a wider market and support marketing cost efficiency, but also makes marketing space and time unlimited. Apart from that, digital marketing is real time, so business people can immediately pay attention to interests and feed back from the target market. The era of modern life is dynamic and makes being effective and efficient a passion, supported by easy access to various needs, in line with the role of E-WOM which helps the processes of the parties involved in it. The research method uses qualitative methods with a single case study research design. Data collection was carried out through participant observation, in-depth interviews and documentation. Data analysis, namely data reduction, data display and conclusion drawing. Test the credibility of the data with triangulation and member checking.</em></p>
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2024 |
Penilaian saham secara fundamental menggunakan metode dividend discount model dan price earning ratio untuk keputusan investasi
(Hadi Satria Ganefi, Agus Prasetyono, Mei Rani Amalia)
DOI : 10.26623/jreb.v16i1.6367
- Volume: 16,
Issue: 1,
Sitasi : 0 11-May-2023
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| Last.09-Jul-2025
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<p><span>Penilaian saham merupakan suatu hal penting yang perlu dilakukan bagi investor dalam melakukan kegiatan investasinya. Hal ini dilakukan dengan tujuan untuk meminimalisir risiko dan memaksimalkan keuntungan yang merupakan syarat dan karakteristik saham <em>hight risk</em> – <em>hight return</em>. Investor dapat melakukan penilaian saham secara fundamental yaitu dengan memperhatikan kondisi kinerja keuangan sebagai dasar untuk pengambilan keputusan. Penelitian ini dilakukan untuk mengetahui harga wajar suatu saham pada perusahaan subsektor perbankan pada periode 2021. Penilaian saham dilakukan berdasarkan dua pendekatan yaitu <em>Dividen Discount Model</em> dan <em>Price Earning Ratio</em>, dari 47 perusahaan subsekektor yang terdaftar sebanyak 12 perusahaan memenuhi kriteria dan dipilih sebagai sampel. Hasil penelitian menunjukkan bahwa dari 12 perusahaan terpilih, terdapat 10 perusahaan yang berada dalam kondisi undervalued dan 2 perusahaan yang berada dalam kondisi <em>overvalued</em>. Dalam kondis <em>undervalued</em> invetor dapat mengambil keputusan dengan membeli saham tersebut, sedangkan pada perusahaan yang berada pada <em>overvalued</em> invetor dapat menjual saham.</span></p><p><span><em>Stock valuation is an important thing that needs to be done for investors in carrying out their investment activities.</em><em> This is with the aim of minimizing risk and maximizing profits which are the terms and characteristics of hight risk – hight return. Investors can make stock valuation fundamentally by taking into account the condition of financial performance as a basis for decision making. This research was conducted to determine the fair price of shares in banking sub-sector companies in the 2021 period. Stock valuation was carried out based on two approaches, namely the dividend discounted model and the price earning ratio, of the 47 registered sub-sector companies, 12 companies met the criteria and were selected as samples. The results showed that of the 12 companies selected, there were 10 companies that were undervalued and 2 companies that were overvalued. In undervalued conditions, investors can make decisions by buying these shares, whereas in overvalued companies, investors can sell their shares.</em></span></p><p><span><br /></span></p>
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2023 |
Reposisi Pelaksanaan Penyelesaian Sengketa Perdata Dengan Gugatan Sederhana (Small Claim Court)
(Muhammad Agus Prasetyo, Supriyadi Supriyadi, Diah Sulistyani, Zaenal Arifin)
DOI : 10.26623/julr.v5i1.4237
- Volume: 4,
Issue: 2,
Sitasi : 0 10-Dec-2022
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| Last.09-Jul-2025
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Tujuan dari penelitian ini adalah untuk menganalisa reposisi pelaksanaan penyelesaian sengketa perdata dengan gugatan sederhana (small claim court). Hal ini yang menjadi urgensi penulis memfokuskan untuk memberikan rekomendasi kepada pengadilan sebagai evaluasi agar melaksanakan sesuai dengan Perma No.4 tahun 2019. Metode Penelitian ini menggunakan Yuridis Normatif. Kebaharuan penelitian ini terletak pada penyimpangan ketentuan dalam Perma No. 4 tahun 2019 yang tidak dijalankan Pengadilan sehingga perlu dilakukan reposisi untuk menata kembali. Berdasarkan hasil penelitian menunjukkan pelaksanaan penyelesaian sengketa perdata dengan gugatan sederhana (small claim court) meliputi tahapan pendaftaran, pemeriksaan kelengkapan gugatan sederhana, penetapan hakim dan penunjukkan panitera pengganti, pemeriksaan pendahuluan, penetapan hari sidang dan pemanggilan para pihak, pemeriksaan sidang dan perdamaian, pembuktian dan putusan diselesaikan dalam waktu paling lama 25 (dua puluh lima) hari sejak sidang pertama. Apabila ada yang keberatan dengan putusan tersebut dapat mengajukan memori keberatan diselesaikan dalam waktu 7 (tujuh) hari. The purpose of this study is to understand the repositioning of Civil Dispute Settlement Implementation with a Simple Claim (Small Claim Court). This is the urgency of the author to focus on providing recommendations to the court as an evaluation in order to carry out in accordance with Perma No. 4 of 2019. This research method uses normative juridical. The novelty of this research lies in the deviation of the provisions in Perma No. 4 of 2019 which was not carried out by the Court so it needed to be repositioned to reorganize. Based on the results of the study, it shows that the Implementation of Civil Dispute Settlement With a Simple Claim (Small Claim Court) includes the registration stage, examination of the completeness of a simple lawsuit, determination of the judge and appointment of a substitute clerk, preliminary examination, determination of the day of trial and summons of the parties, examination of the trial and reconciliation, evidence and decision completed within a maximum of 25 (twenty-five) days. since the first trial. If there are objections to the decision, they can file a memorandum of objection to be resolved within 7 (seven) days.
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2022 |
Sistem Rekomendasi Pakaian Muslim Toko Al-Fath Semarang Dengan Collaborative Filtering
(Nadila Dara Rahmawati, Agus Prasetyo Utomo)
DOI : 10.51903/elkom.v15i1.645
- Volume: 15,
Issue: 1,
Sitasi : 0 30-Jun-2022
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| Last.23-Jul-2025
Abstrak:
The many variations of Muslim clothing make customers confused in determining which clothes to buy. One solution is to use a recommendation system that can help customers find clothes according to their wants and needs. This study aims to create a product recommendation system that can provide product recommendations to Muslim clothing stores using the collaborative filtering method. The recommendation results will only display a maximum of 6 Muslim clothes that have been seen or purchased based on the similarity value of the highest Muslim clothing to the recommendation level with the lowest similarity. The results of Muslim clothing recommendations from customer A are Queen Dress (P0007) with a similarity value of 2.00, Trimuji Toyobo (P0006) with a similarity value of 1.40, Wonder Set 3in1 (P0008) with a similarity value of 1.00, Afnan Atasan Tunik (P0009 ) with a similarity value of 1.00 and Abaya Embroidery Maxi (P0010) with a similarity value of 1.00
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2022 |
Analisa kualitas informasi, kualitas teknikal & fungsional, kualitas keamanan, kemudahan penggunaan mobile aplikasi Gojek terhadap kegunaan, kepuasan dan loyalitas pengguna
(Agus Prasetyo Utomo -, Wahyu Arkhamu Razak)
DOI : 10.51903/e-bisnis.v15i1.610
- Volume: 15,
Issue: 1,
Sitasi : 0 09-Jun-2022
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| Last.23-Jul-2025
Abstrak:
The Gojek Mobile application is one application that is widely used by the wider community. In recent years, Gojek has developed very rapidly and is able to beat conventional transportation modes because it is more practical and has many service features offered by the applicator. This study aims to analyze and determine the extent to which the ease of use, information quality, security quality and technical & functional quality of the Gojek application are perceived as useful for users and have implications for user satisfaction and loyalty. The approach used in this study is included in the type of explanatory research, namely research whose explanation uses hypothesis testing in which the causal relationship between variables is explained. The respondents of this study were 100 students from various universities in the city of Semarang. The data collection technique in this study used a questionnaire instrument where the variables were measured using a five-scale Likert scale, where the data was processed using SmartPLS 3.0. From the model test, the test results show that of the 7 hypotheses, five hypotheses are accepted because they have a significant effect and two are rejected because they are not significant, the data is said to be significant if it has t < 0.05. customer satisfaction variable has a significant effect on loyalty variable with P Values ??= 0.000, information quality variable also has a significant effect on perceived usefullness variable with P values ??= 0.001, perceived easy of use variable affects customer satisfaction variable with P Values ??= 0.000 , the perceived easy of use variable has an effect on the perceived usefullness variable with P Values ??= 0.009, the perceived usefullness variable affects the Customer satisfaction variable with the P Values ??= 0.023, the security quality variable has no effect on the perceived usefullness variable with the P Values ??= 0.085, the technical variable & functional quality has no effect on the perceived usefullness variable with P Values ??= 0.813.
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2022 |
Analisis Keberhasilan E-Learning Universitas Dalam Perspektif Sistem Informasi
(Agus Prasetyo Utomo -, Andiyan Bagas Alfiandika)
DOI : 10.51903/e-bisnis.v15i1.605
- Volume: 15,
Issue: 1,
Sitasi : 0 09-Jun-2022
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| Last.23-Jul-2025
Abstrak:
Universitas Stikubank (Unisbank) Semarang telah mengimplementasikan sistem pembelajaran berbasis web yang dikenal dengan istilah smart campus yang didalamnya terdapat model pembelajaran elearning yang terintegrasi smart campus. Elearning yang diaplikasikan oleh manajemen Unisbank merupakan media pembelajaran online dengan memanfaatkan teknologi informasi agar mudah digunakan seluruh mahasiswa dan dosen dalam proses belajar mengajar. Penelitian ini bertujuan untuk menganalisis keberhasilan/kesuksesan e-learning universitas berdasarkan adaptasi dari model kesuksesan sistem informasi Delone dan McLean . Data primer dan data sekunder digunakan dalam penelitian ini, instrument kuesioner dipakai untuk mendapatkan data primer. Selanjutnya data diolah secara kuantitatif dengan menggunakan perangkat lunak Smart PLS 3.0. Hasil pengujian data selanjutnya dianalisis secara deskriptif untuk memberikan gambaran secara naratif dari hasil penelitian. Hasil olah data penelitian didapatkan bahwa (1) Penilaian mahasiswa tentang system quality pada sistem e-learning tidak berpengaruh signifikan terhadap intention to use dengan p-value 0,729; (2) Penilaian mahasiswa tentang system quality pada sistem e-learning berpengaruh signifikan terhadap user satisfaction dengan p-value 0,002; (3) Penilaian mahasiswa tentang information quality pada sistem e-learning berpengaruh signifikan terhadap intention to use dengan p-value 0,025; (4) Penilaian mahasiswa tentang information quality pada sistem e-learning akan berpengaruh signifikan terhadap user satisfaction dengan p-value 0,000; (5) Penilaian mahasiswa tentang service quality pada sistem e-learning tidak berpengaruh signifikan terhadap intention to use dengan p-value 0,166; (6) Penilaian mahasiswa tentang service quality pada sistem e-learning akan berpengaruh signifikan terhadap user satisfaction dengan p-value 0,000; (7) User satisfaction terkait sistem e-learning berpengaruh signifikan terhadap intention to use dengan p-value 0,000; (8) Intention to use sistem e-learning berpengaruh signifikan terhadap net benefits p-value 0,004; (9) User satisfaction pada sistem e-learning berpengaruh signifikan terhadap net benefits dengan p-value 0,000.
Kata Kunci: PLS, SEM, SmartPLS 3.0, E-Learning, Kesuksesan Sistem Informasi, Delone & McLean Model
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2022 |