1,720,965 research outputs found
Perancangan Pemanfaatan Pompa Air Tenaga Surya Untuk Sumber Air Bersih Desa Sukarame, Kec. Sajira, Banten
No full textWater requirements for the people in sukarame village, Sajira, for daily needs in the dry season tend to increase, They always experience drought for 6-9 months annually. The people independently built water reservoirs from mountain water sources. Water is pumped using a water pumping machine and accommodated in reservoirs, then distributed to local residents through pipes with minimum distribution distance is 1 km from the reservoir. Because the distance between water sources and the people complaining about clean water does not reach their homes. This problem can be done by building a ground well located not far from the house of the community, so that the distance between the source of clean water and the house of the community is not too far, water from the water source will be accommodated in reservoirs by sucking ground water using a solar water pump so residents are not burdened with electricity fees to suck ground well water into clean air tendons. This design is expected to provide a solution for clean water sources for volunteers in the village of Sajira
Optimasi Rekonfigurasi Jaringan Pada Kondisi Beban Yang Berubah Terhadap Waktu Menggunakan Algoritma Binary Particle Swarm Optimization
No full textRekonfigurasi jaringan merupakan salah satu cara untuk mengoptimalkan aliran energi dengan membuka dan menutup switches yang terdapat pada jaringan distribusi Penelitian ini membahas tentang rekonfigurasi jaringan pada kondisi beban yang berubah terhadap waktu untuk meminimalkan rugi energi pada sistem distribusi. Penelitian ini menggunakan 2 skenario dalam proses rekonfigurasi, skenario pertama adalah rekonfigurasi fixed, menentukan konfigurasi jaringan distribusi yang paling optimal berdasarkan kondisi beban puncak setiap bus, setelah topologi jaringan yang paling optimal telah ditentukan, kemudian topologi jaringan pada kondisi permintaan maksimum diaplikasikan pada semua variasi beban untuk meminimalkan rugi energi, skenario kedua adalah rekonfigurasi per jam, Rekonfigurasi per jam, menentukan konfigurasi jaringan distribusi yang paling optimal dengan untuk setiap level pembebanan. Kedua skenario rekonfigurasi dalam penelitian ini dioptimalkan menggunakan algoritma binary particle swarm optimization. Skema ini diujikan pada sistem distribusi 20kV kota Medan. Hasil simulasi kondisi awal sistem distribusi 20 kV kota Medan memiliki rugi energi awal sebesar 325,29 kWh/hari dengan tegangan minimum 19,7756 kV. Hasil simulasi untuk rekonfigurasi dengan skenario 1 didapatkan rugi energi sebesar 249 kWh/hari dengan tegangan minimum 19,8209 kV dan 10 pergantian switch. Sedangkan untuk rekonfigurasi dengan skenario 2 didapatkan rugi energi sebesar 244,02 kWh/hari dengan tegangan minimum 19,8209 kV dan 71 pergantian switch.
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Network reconfiguration is one way to optimize power flow by opening
and closing switches found on the distribution network. In this study discusses
distribution network reconfiguration under variable demand for minimize energy
losses in distribution system. This research using two scenarios, the first scenario
is reconfiguration for maximum demand , in this case the optimum topology is
determined for the maximum demand condition of each node. Later on,
maintaining this topology, the loss behavior for 24 hours, in function of hourly
load profiles in each node is analyzed. The second scenario is hourly
reconfiguration, it finds optimal topology and associated energy losses, for each
one of 24 hour interval, in function of the different hourly demand profiles of the
systems. Both scenarios in this study using binary particle swarm optimization.
The scheme is tested in the 20 kV distribution system of Medan. The results of the
initial conditions simulating the 20 kV distribution system of Medan have energy
losses 337,16 kWh/Day with minimum voltage 19.7756 kV. After the first
scenario reconfiguration is obtained energy losses 249 kWh/Day with minimum
voltage 19,8209 kV and 10 switching operations, and after the second scenario
reconfiguration is obtained energy losses 244,02 kWh/Day with minimum
Voltage 19,8209 kV and 71 switching operations
Optimasi Rekonfigurasi Jaringan Distribusi Tegangan Menengah Kota Medan Menggunakan Algoritma Kunang – Kunang (Firefly Algorithm)
No full textNetwork reconfiguration is defined as changing the topological structure of the distribution network configuration by changing the switch position (open state or closed state) of the tie and sectionalizing switches. The main goal of distribution network reconfiguration is to reduce active power losses and improve the voltage profile. In the distribution network reconfiguration process there are many limitations that must not be violated when finding the most optimal distribution network configuration. maintained in radial form and distribution system voltage in the range of -5% and +10% of nominal voltage. the selection of open switches depends on the voltage difference, this results in the discovery of local minima but the process of obtaining the optimal configuration is much faster. In this research, the algorithm proposed is the firefly algorithm, this scheme was tested on the NR7 84 bus 20 kV distribution system in Medan. The results of the analysis using the proposed method obtained a decrease in power loss from 33.21 kW to 24.49 kW or reduced 26.25% with an open switch 84, 9, 10, 17, 19, 26, 29, 75, 34, 39, 43, 95, 96, 97
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
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