1,720,959 research outputs found
IMPLEMENTASI GREEN CAMPUS DENGAN STASIUN PENGISIAN BATERAI BERTENAGA ANGIN DAN SURYA HIBRIDA
No full textKehidupan manusia tidak lepas dari energi listrik, banyak aspek dalam keseharian kita menggunakan energi listrik untuk beroperasi. Pada saat ini, energi tak-terbarukan menjadi energi utama yang digunakan. Penggunaan energi tak terbarukan membawa dampak besar bagi lingkungan dan menjadi kontributor utama perubahan iklim dan pencemaran lingkungan. Oleh karena itu, kebutuhan akan sumber energi baru dan terbarukan (EBT) semakin meningkat. Universitas Negeri Malang telah berkembang menjadi universitas yang mengimplementasikan program green campus dengan banyak menggunakan teknologi ramah lingkungan berbasis energi baru dan terbarukan (EBT). Oleh karena itu, dengan adanya TTG pengisian baterai bertenaga angin dan surya hibrida akan menjadikan Universitas Negeri Malang sebagai green campus. Sehingga kegiatan pengabdian ini berdampak positif terhadap mitra, baik dari aspek pengetahuan, sosial dan ekonomi yang berimbas pada pengguna, yakni warga UM sendiri
Preliminary Analysis of DC Grid with Photovoltaic for Row House Considering Off-Grid and On-Grid Conditions
No full textPada penelitian ini, desain sistem jaringan DC mempertimbangkan beberapa hal, yaitu desain jaringan DC, kemiringan dan azimuth PV, penentuan pemasangan kabel instalasi, efisiensi, dan jatuh tegangan. Pada penelitian ini juga disajikan bentuk gelombang tegangan dan arus pada perubahan beban, kondisi on grid, dan off grid. Desain awal ini dibantu dengan aplikasi Matlab/Simulink untuk mensimulasikan dan menganalisa bagaimana kinerja dari DC microgrid. Penerapan DC grid pada sistem microgrid dengan beban rumah tangga memiliki efisiensi rata-rata yang tinggi yaitu mencapai 98,48%. Efisiensi sistem DC grid dipengaruhi oleh jumlah beban yang disuplai, resistansi kabel, dan konverter. Sistem jaringan DC juga akan mengurangi konversi AC ke DC atau sebaliknya sehingga memiliki efisiensi yang tinggi. Berdasarkan hasil penelitian ini, dapat dilihat bahwa jaringan DC dapat menjadi alternatif yang menjanjikan dalam aplikasi perumahan di daerah terpencil. Penelitian ini dapat menjadi bahan pertimbangan untuk pengembangan sistem DC di daerah terpencil di masa depan. Dengan mempertimbangkan potensi sumber daya dan efisiensi jaringan yang tinggi, diharapkan dapat membantu daerah-daerah terpencil untuk mendapatkan listrik
Optimasi Titik Daya Maksimum Global dan Distorsi Harmonik Arus pada Sistem PV-Inverter menggunakan Algoritma Migrasi Lebah (QHBM)
No full textThis paper investigates the optimization of the Global Maximum Power Point (GMPP) and the simulation of Total Harmonic Distortion of Current (THDI) from an inverter connected to a nonlinear load. THDI variations are analyzed with respect to ambient temperature (T) and solar irradiance (G). The study also highlights how harmonic components negatively affect steady-state voltage stability in photovoltaic (PV) systems. The Queen Honey Bee Migration (QHBM) algorithm is applied to optimize GMPP while minimizing THDI. An off-grid PV-inverter system is modeled in MATLAB/Simulink. The model extracts THDI as a function of temperature and irradiance. Simulations cover irradiance from 794.8 to 994.2 W/m² and temperature from 20.0°C to 32.3°C, based on daily measurements from 08:25 to 16:50. The QHBM algorithm tracks GMPP effectively under fluctuating irradiance. Results show a 17.3% improvement in power extraction efficiency and a 32.8% reduction in THDI compared to conventional methods. The highest THDI occurs during low irradiance, particularly in the early morning and late afternoon. The algorithm converges in 0.18 seconds, outperforming other techniques. THDI increases during rapid irradiance and temperature changes. The proposed method ensures stable performance and lower THDI. Combining QHBM with active harmonic filters under low irradiance conditions is recommended to improve power quality and enhance system protection.Makalah ini menginvestigasi optimalisasi Global Maximum Power Point (GMPP) dan simulasi Total Harmonic Distortion of Current (THDI) dari inverter yang terhubung ke beban nonlinier. Variasi THDI dianalisis sehubungan dengan suhu lingkungan (T) dan radiasi matahari (G). Studi ini juga menyoroti bagaimana komponen harmonik secara negatif mempengaruhi stabilitas tegangan kondisi tunak dalam sistem fotovoltaik (PV). Algoritma Migrasi Lebah Madu Ratu (QHBM) diterapkan untuk mengoptimalkan GMPP sambil meminimalkan THDI. Sistem PV-inverter off-grid dimodelkan dalam Matlab/Simulink. Model ini mengekstrak THDI sebagai fungsi dari suhu dan radiasi. Simulasi mencakup radiasi dari 794,8 hingga 994,2 W/m² dan suhu dari 20,0°C hingga 32,3°C, berdasarkan pengukuran harian dari pukul 08:25 hingga 16:50. Algoritme QHBM melacak GPP secara efektif di bawah radiasi yang berfluktuasi. Hasilnya menunjukkan peningkatan 17,3% dalam efisiensi ekstraksi daya dan penurunan 32,8% dalam THDI dibandingkan dengan metode konvensional. THDI tertinggi terjadi pada saat pencahayaan rendah, terutama di pagi dan sore hari. Algoritme ini konvergen dalam 0,18 detik, mengungguli teknik lainnya. THDI meningkat selama perubahan radiasi dan suhu yang cepat. Metode yang diusulkan memastikan kinerja yang stabil dan THDI yang lebih rendah. Menggabungkan QHBM dengan filter harmonik aktif di bawah kondisi pencahayaan rendah direkomendasikan untuk meningkatkan kualitas daya dan meningkatkan perlindungan sistem
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
