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Microstructure and Optical Properties Study of Nd-doped BiFeO3 (Ba1-xNdxFeO3) Films on Quartz Substrate Yofentina Iriani; Dianisa Khoirum Sandi; Rainisa Nurmawanti; Sri Budiawanti; Elvinda Bendra Agustina
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 11 No. 2 (2021)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v11n2.p148-157

Bismuth ferrite oxide (BFO), due to its remarkable properties, has become one of the most attractive multiferroic materials to be extensively studied. BFO doped with various materials, including Neodymium (Nd), could improve its properties applicable to numerous electronic devices. However, the study related to the properties of Nd-doped BFO (Ba1-xNdxFeO3) thin films on a quartz substrate, especially the optical properties, is rather scarce. This study aimed to investigate the microstructure and optical properties of the Nd-doped BFO (BNFO) as the variation of the Nd concentrations. Here, the BNFO thin films with Nd concentrations of 0.05 (BNFO5); 0.1 (BNFO10); and 0.2 (BNFO20) have been deposited on the quartz substrates via the sol-gel method done by a spin coater. The films were annealed at 600oC for 1.5 h. The XRD result of the BNFO films revealed a single phase of BFO with a cubic structure. The lattice constants and volume cells of the films declined with more Nd. Meanwhile, the crystallite size and lattice strain changed due to the change in the Nd number. Additionally, the morphology images showed the pores on the films’ surface and the different film thicknesses of each BNFO film. From the optical characterization, the transmittance spectra of the BNFO films tended to rise as the more Nd amount doped, in which the BNFO20 had the highest transmittance. The BNFO10 had the highest refractive index, followed by the BNFO5 and BNFO20. Contrarily, the BNFO20 had the highest extinction coefficient and spectra, followed by the BNFO5 and BNFO10. Further, the bandgap values of the BNFO5, BNFO10, and BNFO20 were 2.75, 2.85, and 2.64, respectively. Accordingly, due to the highest Nd amount that most impacted its microstructure, the BNFO20 exhibited the lowest bandgap value compared to the other films that are good for photovoltaic application.

Study of BOD, COD and TSS Removal in Batik Industry Wastewater using Electrocoagulation Method Elvinda Bendra Agustina; Abdul Hakim Prima Yuniarto
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 7, No 2 (2022): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v7i2.59977

Central Java, especially Pekalongan, is one of the largest batik centres with a high amount of batik waste and has the potential to pollute the environment. Wastewater treatment using the electrocoagulation method as an alternative to environmental pollution prevention in Pekalongan Regency. This study determined the effect of stress and resistance time on decreasing COD, BOD and TSS levels in batik wastewater. The analysis performed on the samples included BOD (Biological Oxygen Demand), COD (Chemical Oxygen Demand), TSS (total suspended solids), and pH. Voltage variations of 12, 24, and 30 volts and holding times of 90, 120, 150, and 180 minutes were applied. A pair of aluminium metals (Al-Al) was used with a thickness of 0.1 cm, an area of 12x14 cm, and a volume of 2500 ml. The results showed that the voltage and contact time decreased the amount of COD, BOD and TSS. In addition, the results showed that the electrocoagulation method at a voltage of 30 volts and a contact time of 180 minutes could reduce COD levels by 75.78%, TSS levels by 93.9%, and BOD levels by 83.75%.

Pengaruh Jarak Elektroda dan Waktu Terhadap Kandungan COD dan TSS Menggunakan Metode Filtrasi-Elektrokoagulasi pada Pengolahan Limbah Batik Elvinda Bendra Agustina; Abdul Hakim Prima Yuniarto; Dian Arif Rachman; Alif Tiana Dewi
Lontar Physics Today Vol 1, No 1 (2022): Februari 2022
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v1i1.10669

Produksi batik menghasilkan limbah cair yang memiliki dampak negatif terhadap lingkungan karena bahan kimia hasil pengolahan. Metode filtrasi-elektrokoagulasi dirasa efektif untuk menurunkan kandungan COD dan TSS pada limbah cair batik sehingga layak buang. Telah dilakukan pengolahan limbah batik menggunakan metode filtrasi-elektrokoagulasi dengan variasi jarak elektroda (2, 4, dan 6) cm dan waktu kontak (60, 90, 120 dan 150) menit. Digunakan elektroda alumunium (Al-Al) dengan ketebalan 0,1 cm dan volume limbah 2500 ml. Hasil penelitian menunjukkan efisiensi penurunan COD dan TSS tertinggi pada variasi jarak 2 cm dengan waktu kontak 150 menit. Efisiensi penurunan COD sebesar 95% sedangkan efisiensi penurunan TSS sebesar 94%. Hasil tersebut menunjukkan bahwa semakin dekat jarak antar elektroda dan semakin lama waktu kontak maka semakin tinggi penurunan kandungan COD dan TSS.Keywords: Filtrasi-elektrokoagulasi, Limbah batik, COD, TSS

Edukasi Penerapan Teknologi Panel Surya berbasis Internet of Things sebagai Sumber Energi Listrik di Desa Kandangserang Inayah, Inayatul; Agustina, Elvinda Bendra
Jurnal Pengabdian Pada Masyarakat Vol 9 No 2 (2024): Jurnal Pengabdian Pada Masyarakat
Publisher : Universitas Mathla'ul Anwar Banten

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

Energi listrik merupakan salah satu komponen pokok dalam kehidupan sehari-hari, namun saat ini sumber energi listrik masih berfokus pada energi fosil yang akan semakin menipis akibat eksplorasi secara terus-menerus. Sebagai negara tropis, indonesia memiliki potensi besar dalam pengembangan energi surya, khususnya Kota Pekalongan yang berada di wilayah Jawa Tengah. Kota Pekalongan memiliki potensi penyebaran penyinaran surya yang merata, sehingga pengembangan panel surya sebagai energi terbarukan sangatlah berpotensi. Sayangnya, masyarakat masih belum mengetahui tentang pemanfaatan panel surya untuk memenuhi kebutuhan listrik rumah tangga. Oleh karena itu, kegiatan pengabdian ini bertujuan untuk mengedukasi masyarakat mengenai penerapan teknologi panel surya sebagai sumber energi listrik. Kegiatan pengabdian dilakukan dengan melakukan survei, wawancara, dan monitoring serta evaluasi. Hasil dari kegiatan pengabdian yaitu masyarakat memahami pemanfaatan energi surya sebagai sumber energi terbarukan, sehingga masyarakat terdorong untuk membangun panel surya guna memenuhi kebutuhan listrik rumah tangga. Selain itu, masyarakat juga mengetahui pemanfaatan teknologi internet of things (IoT) untuk mengetahui kinerja panel surya secara realtime, sehingga perawatan panel surya dapat dilakukan secara optimal. Tingkat kepuasan peserta terhadap kegiatan ini yaitu 46.32% peserta menyatakan sangat puas, dan 49.47% peserta menyatakan puas. Hasil tersebut menunjukkan adanya kebermanfaatan dari kegiatan edukasi penerapan teknologi panel surya berbasis IoT sebagai sumber energi listrik. Electrical energy is one of the main components of everyday life. However, electrical energy sources are currently focused on fossil energy, which will become increasingly depleted due to continuous exploration. As a tropical country, Indonesia has great potential to develop solar energy, especially in Pekalongan City in the Central Java region. Pekalongan City has the potential for even distribution of solar radiation, so the development of solar panels as renewable energy has the potential to be carried out. Unfortunately, people still don't know about using solar panels to meet household electricity needs. Therefore, this service activity aims to educate the public regarding the application of solar panel technology as a source of electrical energy. Service activities are carried out by conducting surveys, interviews and literature studies. The result of the service activities is that the community understands the use of solar energy as a renewable energy source so the community is encouraged to build solar panels to meet household electricity needs. Apart from that, the public also knows about the use of Internet of Things (IoT) technology to determine the performance of solar panels in real time so that solar panel maintenance can be carried out optimally. The level of participant satisfaction with this activity was 46.32% of participants said they were very satisfied, and 49.47% said they were satisfied. These results show the benefits of educational activities in implementing IoT-based solar panel technology as a source of electrical energy.

Desain Sistem Smart Feeder Ayam Berbasis Internet of Things (IoT) Guna Mencegah Keterlambatan Pemberian Pakan Elvinda Bendra Agustina; Dian Arif Rachman; Recha Nofillah; Lia Ikhlasia Fitri
Jurnal Fisika Unand Vol 13 No 2 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.2.297-302.2024

Pemberian pakan ayam secara manual menjadikan pemberian pakan ayam kurang efektif dan efisien. Pengembangan sistem pemberi pakan ayam cerdas berbasis Internet ofThings (IoT) telah dilakukan. Penelitian ini bertujuan untuk mengembangkan desain sistem smart feeder ayam berbasis IoT guna mencegah keterlambatan pemberian pakan. Memungkinkan alat bekerja dengan melakukan kontrol feeder berdasarkan pengaturan waktu, monitoring hopper secara otomatis yang diintegrasikan dengan IoT. Setiap device dihubungkan dengan internet sehingga dapat dipantau dari jarak jauh. Metode yang digunakan adalah perancangan dan telah dilakukan uji dan pengambilan data. Hasil uji aplikasi Blynk menunjukkan ketepatan pengaturan yang telah diberikan dengan kondisi real. Fungsi sistem alat sudah sesuai dengan desain sistem yang direncanakan. Rata-rata persentase error yang terjadi 14% secara keseluruhan tetapi mengecil sampai rata-rata 3% pada berat pakan diatas 5 kg dikarenakan semakin besar volume hopper maka jarak antara sensor ke pakan semakin dekat sehingga nilai error semakin rendah. Pengujian NTP menunjukkan nilai akurasi dan kepresisian 100%. Uji kecepatan rotasi menunjukkan rata-rata kecepatan rotasi hopper yaitu 445,4 rpm sehingga hopper berotasi sesuai dengan perkiraan. Uji volume distribusi pakan sudah sesuai karna pakan 1 diletakkan paling dekat dengan hopper sehingga volume pakan akan terisi paling banyak di bandingkan dengan tempat pakan lainnya

Analisis Pengaruh Limbah Cair terhadap Kualitas Air Sungai di Kota Pekalongan Elvinda Bendra Agustina; Yuni Lestiyanti; Yusril Ihza Tachriri; Nina Ulfiya
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 2 (2025): April 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i2.5117

A study has been conducted on the effect of liquid waste on river water quality in Pekalongan city. Banger River, Meduri River, Loji River and Asem Binatur River in Pekalongan city are the objects studied. Water sampling was carried out at one polluted point. Based on water quality testing, it is known that among the four rivers tested, the rivers with the most polluted conditions are the Asem Binatur River, Loji River, Meduri River, and Banger River. This is because the samples were taken during the rainy season, so there is a possibility of soil erosion originating from areas along the river flow. The position of the Meduri River which is close to the sea is also a cause of the increase in the pollutant load in the test results, because the river is mixed with seawater when tidal flooding occurs. In addition, the Meduri River Basin (DAS) is a factory and industrial area, so that wastewater from these activities can also increase the pollutant load on the river. However, the majority of test results from the four rivers still exceed the required quality standards. This is due to the dense population, the large number of batik industries, and agricultural activities that produce waste and have an impact on the pollution of the surrounding rivers.

Analisis Pengaruh Limbah Cair terhadap Kualitas Air Sungai di Kota Pekalongan Elvinda Bendra Agustina; Yuni Lestiyanti; Yusril Ihza Tachriri; Nina Ulfiya
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 2 (2025): April 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i2.5117

A study has been conducted on the effect of liquid waste on river water quality in Pekalongan city. Banger River, Meduri River, Loji River and Asem Binatur River in Pekalongan city are the objects studied. Water sampling was carried out at one polluted point. Based on water quality testing, it is known that among the four rivers tested, the rivers with the most polluted conditions are the Asem Binatur River, Loji River, Meduri River, and Banger River. This is because the samples were taken during the rainy season, so there is a possibility of soil erosion originating from areas along the river flow. The position of the Meduri River which is close to the sea is also a cause of the increase in the pollutant load in the test results, because the river is mixed with seawater when tidal flooding occurs. In addition, the Meduri River Basin (DAS) is a factory and industrial area, so that wastewater from these activities can also increase the pollutant load on the river. However, the majority of test results from the four rivers still exceed the required quality standards. This is due to the dense population, the large number of batik industries, and agricultural activities that produce waste and have an impact on the pollution of the surrounding rivers.

Klasifikasi Strategi Penjualan Produk UMKM dengan Penerapan fitur seleksi Forward Selection pada Algoritma C4.5 Fanani, M. Rudi; Agustina, Elvinanda Bendra
Smart Comp :Jurnalnya Orang Pintar Komputer Vol 14, No 4 (2025): Smart Comp: Jurnalnya Orang Pintar Komputer
Publisher : Politeknik Harapan Bersama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/smartcomp.v14i4.6842

Perkembangan Usaha Mikro, Kecil, dan Menengah (UMKM) di Indonesia telah menjadi sorotan utama dalam memajukan ekonomi, mengurangi kemiskinan, dan meningkatkan kesejahteraan masyarakat. UMKM tak hanya berperan strategis dalam menciptakan lapangan kerja, menggerakkan ekonomi lokal, namun juga menjadi sumber inspirasi bagi inovasi dan kreativitas. Kelurahan Kedungwuni Timur merupakan wilayah di kecamatan Kedungwuni Kabupaten Pekalongan Jawa Tengah. Profesi mayoritas warga Kelurahan Kedungwuni Timur bergerak dalam bidang UMKM Fashion. Kendala saat ini pihak konsumen sudah dengan mudah membandingkan suatu produk. Oleh karena itu perlu dilakukan sebuah strategi penjualan dengan memanfaatkan konsep Teknologi Informasi salah satunya menggunakan teknik Data Mining. Algoritma C4.5 merupakan algoritma dari data mining yang digunakan untuk memprediksi strategi penjualan produk UMKM dengan nilai akurasi yang didapat sebesar 82.78%. Untuk meningkatkan nilai akurasi maka digunakan fitur seleksi forward selection sehingga menghasilkan akurasi sebesar 86.11%.

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