1,720,956 research outputs found
PENERAPAN PENGOLAHAN DATA ALE UNTUK MENDUKUNG LAYANAN INFORMASI CUACA ANTARIKSA DI INDONESIA (IMPLEMENTATION OF ALE DATA PROCESSING FOR SUPPORTING THE INDONESIAN SPACE WEATHER INFORMATION SERVICES)
No full textMakalah ini membahas tentang penerapan pengolahan data Automatic Link Establishment (ALE) untuk mendukung layanan informasi cuaca antariksa di Indonesia yang dikenal dengan Space Weather Information and Forecast Services (SWIFtS). Sebagai salah satu instrumen pengamatan yang serupa dengan aplikasi dalam komunikasi radio High Frequency (HF; 3-30 MHz), pengolahan data dari jaringan ALE nasional yang berkesinambungan memiliki potensi untuk digunakan sebagai informasi pendukung layanan SWIFtS. Hasil pengolahan data ALE mampu menunjukkan informasi dari kondisi ionosfer yang merupakan salah satu komponen dari cuaca antariksa. Kondisi parameter lapisan ionosfer berupa nilai frekuensi kritis (fo) dan frekuensi minimum (fmin) dapat terlihat pada grafik hasil pengolahan data ALE. Batas nilai frekuensi atas dan bawah hasil pengolahan data ALE memiliki kesesuaian dengan batas perhitungan nilai Maximum Usable Frequency (MUF) dan Lowest Usable Frequency (LUF) saat ionosfer berada pada kondisi normal. Kesesuaian tersebut juga terlihat jelas saat terjadinya kondisi abnormal atau gangguan di ionosfer yang disebabkan oleh peristiwa X-Ray flare matahari kelas M. Peristiwa gangguan berupa peningkatan nilai LUF dapat terlihat dari hasil pengolahan data ALE yang diperoleh. Hasil tersebut menunjukkan bahwa penerapan pengolahan data ALE dapat mewakili informasi kondisi lapisan ionosfer, sehingga dapat digunakan sebagai pendukung layanan informasi cuaca antariksa di Indonesia, khususnya bagi pengguna komunikasi radio HF.Hal. 21-29 : ill. ; 23 c
Peningkatan Kerapatan Elektron Lapisan E Sporadis Di Atas Tanjungsari Dan Pameungpeuk Pada Saat Terjadi Badai Meteor Leonid Tahun 2001
No full textDua puncak aktivitas badai meteor Leonid tahun 2001 terjadi pada tanggal 18 November pukul 10.30 UT (17.30 WIB) yang teramati di wilayah Amerika, dan pukul 18.00 UT (1.00 WIB tanggal 19 November 2001) yang teramati di wilayah Asia dan Australia. Sementara itu peningkatan kerapatan elektron lapisan E. di atas Sumedang terjadi dua kali. Peningkatan pertama terjadi pada tanggal 19 November 2001 dini hari dan mencapai puncaknya (885.887elektron/m3 - 8.45 MHz dalam satuan frekuensi plasma) pada pukul 04.00 WIB. Peningkatan kedua terjadi pada tanggal 20 November 2001 dini hari dan mencapai puncaknya (826.124 elektron/m3 - 8.16 MHz dalam satuan frekuensi plasma) pukul 02.30 WIB. Di SPD Pameungpeuk tanggal 19 November 2001 dini hari tidak ada pengamatan, dan pada tanggal 20 November 2001 dini hari terjadi peningkatan kerapatan elektron lapisan E. dan mencapai puncaknya (652.140 elektron/m3 N 7.25 MHz dalam satuan frekuensi plasma) pada pukul 02.30 WIB. Hasil yang diperoleh adalah badai meteor Leonid 2001 mempengaruhi peningkatan foEs di Tanjungsari dan Pameungpeuk.Hlm. 25-3
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Frekuensi Kritis Lapisan F2 (f0f2) ionosfer Near Real Time Indonesia dan Model IRI-2007
No full textLapisan atmosfer bumi yang berada pada ketinggian antara 50-1000 km dimana molekul-molekul dan atom-atom akan pecah membentuk sekumpulan partikel bermuatan berupa elektron dan ion alcilmit pengaruh radiasi extreme ultra violet (EUV) matahari disebut lapisan ionosfer. Karakteristik lapisan ionosfer penting untuk dipahami karena bermanfaat untuk kommikasi radio dan koreksi posisi pada sistem navigasi menggunakan GPS. Selain itu lapisan ionosfer juga memptmyai respon tertentu terhadap fenomena alam seperti gempa sehingga pemahaman tentang respon tersebut dapat digunakan sebagai prekursor kejadian gempa (Pulinet dan Boyarchuk, 2004). Salah satu parameter lapisan ionosfer yang penting dalam hal ini adalah foF2 yaitn frekuensi tertinggi dart gelombang radio yang masih dapat dipantulkan oleh lapisan ionosfer dalam arch penjalaran vertikal. Bidang Ionosfer dan Telekomnnikasi LAPAN telah men.ugembangkan model ionosfer mendekati real time yang sudah berupa peta TEC di atas Sumatra dan sekitarnya (Buldan M dan Septi P , 2009). Dan peta TEC di atas Sumatera dan sekitamya dapat dibuat peta foF2 menggunakan model hubungan kuadrat antara foF2 dan TEC. Untuk meningkatkan akurasi model maka hasil keluaran model tersebut perk dibandingkan dengan model lainnya yang sudah lebih dulu ada. Oleh karena itu akan dianalisis bagaimana parameter foF2 keluaran model mendekati real time LAPAN dibandingkan dengan model ilt1-2007Hal. 58-6
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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