1,720,960 research outputs found
KETERSEDIAAN DAN SERAPAN SULFUR SERTA TIMBAL PADA TANAMAN JAGUNG (Zea mays) AKIBAT PEMBERIAN BIOSULFUR YANG MERUPAKAN HASIL SAMPING DARI PENGOLAHAN GAS ALAM CAIR
No full textBiosulfur merupakan hasil produk samping dalam proses pengolahan gas, yang diperoleh dari proses pemurnian gas. Dalam prosesnya, H2S diubah menjadi sulfur menggunakan proses aktifitas mikroorganisme sehingga sulfur yang dihasilkan merupakan biosulfur. Proses ini dilakukan untuk menurunkan kandungan sulfur dalam gas sampai pada taraf yang diperbolehkan yaitu kurang dari 4 ppm. Produk dari biosulfur yang dihasilkan dari pemurnian ini sangat banyak dan bahkan berton-ton. Biosulfur yang dihasilkan dari pengolahan gas itu belum digolongkan apakah termasuk limbah B3 (Bahan Berbahaya dan Beracun) atau tidak, selain itu berdasarkan informasi bahwa biosulfur dapat digunakan sebagai pupuk tanaman pada kegiatan pertanian. Oleh karena itu, perlu dilaksanakan suatu penelitian untuk mengetahui manfaat maupun kendala terhadap penggunaan biosulfur tersebut terhadap tanaman. Penelitian ini dilakukan untuk mengetahui tingkat ketersediaan dan serapan S dan Pb pada tanaman jagung (Zea mays L.) akibat pemberian Biosulfur yang merupakan hasil samping dari pengolahan gas. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian biosulfur dan pupuk dasar terhadap ketersediaan dan serapan S dan Pb pada tanaman jagung (Zea mays L.). Metode penelitian yang digunakan dalam peelitian ini yaitu dengan menggunakan Rancangan Acak Lengkap dengan 4 perlakuan dan 3 ulangan. Dimana masing-masing perlakuan yaitu tanpa pemberian pupuk dasar dan biosulfur, pemberian biosulfur tanpa pupuk dasar, pemberian pupuk dasar tanpa pemberian biosulfur dan pemberian biosulfur yang dibarengi dengan pemberian pupuk dasar. Dari hasil penelitian menunjukan bahwa dengan pemberian Biosulfur yang dikombinasikan dengan pupuk dasar teruji efektif dapat menurunkan Aldd tanah dan meningkatkan pH, P-tersedia, P-total, Bobot kering tanaman, konsentrasi Pb dan S serta meningkatkan serapan Pb dan S pada tanaman jagung (Zea mays L.)
Kajian Konsentrasi Logam Merkuri (Hg) Pada Tanah Dan Serapan Tanaman Pangan Di Sekitar Kelurahan Poboya
Full text linkFood crops are agricultural products consumed to support our daily lives. Food plants are also a source of vitamins and minerals needed by our bodies and directly play a role in improving health. Therefore, the hygiene and safety of the food we consume is very important, not to cause health problems. Soil is an importantfactor in agriculture, as a medium to grow plants and is also a part of the cycle of heavy metals. The gold mining business is often seen as the cause of environmental damage and pollution. This research was conducted at food and secondary crops farms around Poboya, where soil and plant analysis was carried out at the Laboratory of Natural Resources and Environment, Faculty of Agriculture, Tadulako University, Palu. The research was conducted from September to November 2020. The method used was survey with field observations and laboratory analysis, gradually done through pre-survey, main survey (sampling) and laboratory analysis with tactical sampling. The results showed that mercury (Hg) concentration in the sample point 1 was 0.48 - 0.52 ppm, sample point 2 was 0.62 - 0.63 ppm, sample point 3 was 0.30 - 0.35 ppm and sample point 4 is 0.25 - 0.26 ppm. While the concentration of mercury (Hg) in food crops, namely: sample point 1 is 0.31 - 0.33 ppm, sample point 2 is 0.45 - 0.48 ppm, sample point 3 is between 0.20 - 0.24 ppm and sample point 4 around 0.09 - 0.10 ppm. This shows that the content of heavy metal mercury (Hg) in the soil around Poboya has passed the tolerable threshold. Meanwhile, the concentration of mercury (Hg) in food crops at points 1 and 2 passed the critical threshold, while sample points 3 and 4 were still below the critical threshold. The farther the distance from the processing site, the less mercury content in the soil and in food crops.Tanaman pangan merupakan hasil pertanian yang kita konsumsi dalam menunjang kehidupan sehari-hari. Tanaman pangan juga merupakan sumber vitamin dan mineral yang dibutuhkan oleh tubuh kita dan secara langsung berperan dalam peningkatan kesehatan. Oleh karena itu, higienitas dan keamanan pangan yang kita konsumsi sangatlah penting agar tidak menimbulkan gangguan kesehatan. Tanah adalah salah satu faktor penting dalam bidang pertanian, yaitu sebagai media tumbuh tanaman dan juga merupakan bagian dari siklus logam berat. Usaha tambang emas yang dilakukan oleh sebagian masyarakat sering dianggap sebagai penyebab kerusakan dan pencemaran lingkungan. Penelitian ini dilakukan di Lokasi lahan kebun tanaman pangan dan palawija disekitar kelurahan Poboya serta analisis tanah dan tanaman dilakukan di Laboratorium Sumberdaya Alam dan Lingkungan Fakultas Pertanian Universitas Tadulako Palu. Penelitian ini dilakukan dari bulan September sampai November 2020. Metode penelitian yang digunakan dalam penelitian ini adalah metode survey. Dalam penelitian ini dilakukan pengamatan dilapangan dan pengkuran laboratorium, ada 3 hal yang dilakukan yaitu pra survei, survei utama (pengambilan sampel) dan analisa laboratoruim, dengan pengambilan sampel secara taktis. Hasil penelitian menunjukan konsentrasi merkuri (Hg) pada sampel tanah titik sampel 1 sebesar 0,48 – 0,52 ppm, titik sampel 2 sebesar 0,62 – 0,63 ppm, titik sampel 3 sebesar 0,30 – 0,35 ppm dan titik sampel 4 sebesar 0,25 – 0,26 ppm. Sementara besarnya konsentrasi merkuri (Hg) pada serapan tanaman pangan yaitu : titik sampel 1 sebesar 0,31 – 0,33 ppm, titik sampel 2 sebesar 0,45 – 0,48 ppm, titik sampel 3 antara 0,20 – 0,24 ppm dan titik sampel 4 sekitar 0,09 – 0,10 ppm. Hal ini menunjukan bahwa kandungan logam berat merkuri (Hg) dalam tanah di sekitar kelurahan Poboya sudah melewati ambang yang bisa di tolelir. Sedangkan konsentrasi merkuri (Hg) tanaman pangan dititik sampal 1 dan 2 melewati ambang batas kritis, sementara titik sampel 3 dan 4 masih dibawah ambang batas kritis. Semakin jauh jarak dari lokasi pengolahan, semakin berkurang kandungan merkuri pada tanah dan tanaman pangan.
Kata Kunci : Pencemaran, Tambang emas, Tanah, Tanaman
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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