1,720,959 research outputs found
Water Trophic Level in Lampung Bay with VGPM Method (Vertically Generalized Production Model)
No full textTeluk Lampung memiliki potensi sumber daya perikanan tinggi yang didukung oleh kesuburan perairannya. Penelitian bertujuan memodelkan secara spasial dan temporal kesuburan perairan berdasarkan produktivitas primer (PP) di perairan Teluk Lampung. Data yang digunakan yaitu data observasi lapang yaitu suhu permukaan laut (SPL), klorofil-a, dan PP, lalu data sekunder yaitu curah hujan, SPL, klorofil-a, dan Photosynthetically Active Radiation (PAR). Pemodelan PP menggunakan metode VGPM. Validasi data dilakukan pada data SPL, klorofil-a, dan PP menggunakan metode Root Mean Square Error. Hasil validasi menunjukkan nilai 0,27 untuk SPL, 1,60 untuk klorofil-a, dan 155,66 untuk PP. Sebaran PAR Teluk Lampung berkisar 35 – 52,50 E/m^2/hari. Sebaran SPL berkisar 28,5 – 31,50° C. Sebaran klorofil-a tertinggi berada di kepala teluk dengan kisaran 0,30 – 12 mg/m^3. Analisis korelasi menunjukkan klorofil-a memiliki pengaruh tertinggi dengan nilai 0,99. PP tertinggi berada di area kepala teluk dengan nilai 988,28 mgC/m^2/hari. Sementara area tengah dan luar teluk memiliki rata-rata yang rendah dengan nilai 345,54 dan 291,13 mgC/m^2/hari. Kesuburan perairan Teluk Lampung berdasarkan PP menunjukkan kesuburan yang tinggi pada kepala teluk dengan tingkat eutrofik dan mesotrofik. Pada area tengah dan luar teluk menunjukkan kesuburan sedang pada tingkat mesotrofik dan oligotrofik.Lampung Bay has a great fisheries potential with support of its water trophic level (WTL). Research objection is model spatial and temporal distribution of WTL in Lampung Bay. Research data is from field observation i.e. sea surface temperature (SST), chlorophyll-a, and primary productivity (PP), secondary data i.e. rainfall, SST, chlorophyll-a, and Photosynthetically active radiation (PAR). VGPM method is applied to model PP. Validation in this research is applied to SST, chlorophyll-a, and PP using root mean square error method. Validation shows its value 0,27 for SST, 1,60 for chlorophyll-a, and 155,66 for PP. PAR level reach 35 – 52,50 E/m^2/day. SST with range 28,50 – 31,50°C. Chlorophyll-a on head’s bay is the highest with range 0,3 – 12 mg/m^3. Correlation analysis shows that chlorophyll-a has the most impact on PP with value of 0,99. PP on head’s bay with high average of 988,23 mgC/m^2/day. Meanwhile, center and outer bay have lower value with average of 345,54 and 291,13 mgC/m^2/day. WTL on Lampung Bay based on PP indicate high WTL on head’s bay with eutrophic and mesotrophic levels. Meanwhile, on center and outer bay indicate moderate value with mesotrophic and oligotrophic level
Partisi Logam Berat Cu dan Zn dalam Sedimen di Perairan Teluk Banten.
No full textTeluk Banten telah terpengaruh oleh aktivitas industri dan berpotensi membuang limbah yang terkontaminasi logam berat melalui mulut sungai. Penelitian ini bertujuan untuk mengetahui konsentrasi Cu dan Zn dalam sedimen dan untuk mengetahui hubungan logam berat, baik bahan organik, maupun ukuran butiran sedimen. Sedimen diambil di lima stasiun pengamatan pada bulan Desember 2015. Analisis laboratorium dilakukan pada bulan Desember 2016 sampai Februari 2017. Kandungan logam berat dianalisis dengan menggunakan Atomic Absorption Spectrometer (AAS). Konsentrasi logam berat dalam sedimen bervariasi 1,9-10,6 mg / kg untuk Cu dan 9,2-36,9 mg / kg untuk Zn. Uji ANOVA dan analisis cluster menunjukkan tidak ada korelasi antara konsentrasi logam berat dan ukuran butiran sedimen yang diamati. Demikian pula, tidak ada korelasi antara organik dengan pasir dan lumpur. Korelasi antara Cu dan bahan organik secara tepat menunjukkan hubungan negatif dan tidak menunjukkan adanya hubungan untuk Zn
Variabilitas Klorofil-a dan Interelasinya Terhadap ENSO (El Niño Southern Oscillation) Di Perairan Utara Papua.
No full textThis research aimed to study the variability of surface chlorophyll-a and its interrelation to ENSO (El Nino Southern Oscillation) in the North Papua waters. Monthly averaged data of Nino 3.4 Index from CPC NOAA, sea surface temperature (SST) from ERSL NOAA, and surface chlorophyll-a from Globcolor Project were analyzed using FFT (Fast Fourier Transform) and wavelet methods during September 1997 - April 2009. Referring to temperature anomaly at Nino region 3.4 during the period this study, three El Nino events were taken place in 1997/1998, 2002/2003, and 2004/2005. The 1997/1998 El Nino was the strongest with temperature anomaly reaching +2,69 oC, while from twice La Nina events (1998/1999/2000, 2007/2008), the 2007/2008 La Nina showed the weakest temperature anomaly at -1,89 oC. During 1997/1998 El Nino, SST in the North Papua waters was decreasing to range 29,48 - 29,72 oC, compared to its normal range of 30,05 - 30,33 oC. On the contrary, surface chlorophyll-a was increased to 0,088 – 0,391 mg/m3 during 1997/1998 El Nino, while low range of chlorophyll-a was observed during 2007/2008 La Nina (0,062 – 0,140 mg/m3 Keywords: chlorophyll-a, sea surface temperature, El Nino, inter-annual signal, North Papua ). During El Nino, hotspot of chlorophyll-a was shifted from west to east and following the movement of warm pool. Power spectrum density of chlorophyll-a revealed dominant inter-annual signal compare to annual and semi-annual. Cross-correlation analysis between Nino 3.4 with chlorophyl-a variability showed strong coherence at inter-annual signal which presumed as El Nino, in where the rise of chlorophyll-a was observed 1 - 3 month after El Nino event
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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