1,720,963 research outputs found
EKSTRAKSI ALUMINIUM DARI TANAH LEMPUNG GAMBUT SEBAGAI KOAGULAN CAIR
Full text linkABSTRAKAluminium adalah bahan utama yang terkandung dalam koagulan yang umum digunakan dalam proses koagulasi. Aluminium merupakan kandungan elemen ketiga terbesar yang terdapat pada lapisan kulit bumi, yang terdapat dalam mineral, bebatuan dan tanah liat, seperti tanah lempung gambut yang mengandung garam aluminium, telah dapat dijadikan koagulan bantu. Pada penelitian ini dilakukan pengembangan dengan mengekstraksi aluminium yang terkandung dalam tanah lempung gambut yang mengandung 18,78% Al2O3 dijadikan kogulan pengganti (PAC) untuk menurunkan zat organik alam pada air gambut. Hal yang ingin dicapai dari penelitian ini adalah dihasilkannya koagulan cair dari tanah lempung gambut yang ada di Indonesia. Koagulan cair diekstraksi dari tanah lempung gambut dari Kalimantan Selatan dengan menggunakan pelarut asam sulfat (H2SO4). Untuk mendapatkan Al2O3 dari tanah lempung gambut tersebut, tanah dikalsinasi dan diekstraksi. Proses pengaktifan Aluminium dari tanah dipengaruhi oleh ukuran butiran tanah, temperatur kalsinasi dan waktu kalsinasi. Untuk proses leaching dipengaruhi konsentrasi dan jumlah H2SO4 dalam kondisi mendidih.Kata kunci: asam sulfat, ekstraksi, kalsinasi, koagulan cair, tanah lempung gambut. ABSTRACTAluminum is the primary material contained in commonly used coagulant in the coagulation process. Aluminum is the third largest content of elements found in the earth's crust in the form of minerals, rocks and clay. Peat loam soil is one of the class that contains of aluminum salts and can be used as coagulant aids. In this research, further development by extracting aluminum contained in peat clay. In which the aluminum in the form of 18.78% Al2O3 on clay peat coagulant used as a substitute for the (PAC). The aim of this research was the production of liquid coagulant of clay peat in Indonesia. This liquid coagulant extracted from peat loam soil of South Kalimantan using sulfuric acid solvent (H2SO4) with a concentration of 40%. To obtain Al2O3 from the peat loam soil, the soil had to be calcinated and extracted. The aluminum activating processes of soil was influenced by soil particle size, temperature and duration of calcination. Meanwhile the leaching process was affected by the amount and concentration of H2SO4 in boiling conditions.Keywords: calcinations, extraction, liquid coagulant, sulfuric acid, the clay peat</jats:p
KRUENG BRAYEUN'S POTENTIAL AS A RAW SOURCE OF DRINKING WATER FOR BANDA ACEH CITY AND ACEH BESAR DISTRICT IN ATTAINING SDGS (SUSTAINABLE DEVELOPMENT GOALS)
Full text linkThis study aims to analyze the potential of krueng brayeuen as a raw source of drinking water for the city of Banda Aceh and Aceh Besar district. Data was collected through document analysis and analysis of water samples taken from 5 different points in the Krueng Brayeuen watershed. Water quality analysis includes metal content of Fe, Mn, ammonia content, Total Dissolved Solid (TDS), and organic matter content. While other qualities include color, odor, taste, chlorine content, and others. The results showed that the water discharge of krueng brayeuen every year showed a promising value to be used as a source of raw water. The results of the water quality test showed that the water in Krueng Brayeuen was tasteless, colorless and odorless. Testing of all other water parameters such as iron content, Mn content, ammonia content and organic matter content met the drinking water standards in general where the levels were still below the threshold set by PP. 22/2021. Based on the results of the analysis of water quality and contamination, it can be concluded that krueng brayeuen water is very suitable to be used as a raw source of drinking wate
Efektifitas Fly Ash Batubara Sebagai Adsorben Dalam Menurunkan Parameter BOD, COD Dan Kadar Fe, Mn, Dan Zn Pada Air Lindi TPA Blang Bintang, Aceh Besar
Full text linkproses penimbunan yang terus menerus di Tempat Pembuangan Akhir (TPA) Blang Bintang Aceh Besar menghasilkan polutan berupa lindi. Kadar pencemar yang terkandung dalam lindi khususnya kandungan logam dapat diolah dengan menggunakan abu layang batubara sebagai adsorben. Penelitian ini bertujuan untuk melihat kemampuan adsorben dalam menyerap polutan pada lindi berupa BOD, COD, Fe, Mn dan Zn. Adsorben yang digunakan dalam penelitian ini adalah fly ash batubara yang telah dipirolisis pada suhu 110oC dimodifikasi menjadi ukuran nano dengan larutan asam sulfat teraktivasi. Adsorben yang diperoleh diuji kapasitas dan efektivitas adsorpsinya terhadap penyerapan BOD, COD, Fe, Mn dan Zn dengan variasi massa (35 gr, 50 gr, 65 gr, 80 gr, dan 100 gr) dan kecepatan pengadukan 300 rpm dengan waktu kontak 60 menit. Konsentrasi awal BOD, COD, Fe, Mn dan Zn adalah 162 mg/L, 1.405 mg/L, 6,8 mg/L, 2,1 mg/L, dan 5,03 mg/L. Hasil penelitian menunjukkan bahwa ukuran adsorben, dan variasi massa mempengaruhi kapasitas dan efektivitas adsorpsi. Pada massa optimum 100 gr/L, efektifitas Mn sebesar 98,09%, Zn sebesar 97,41%, Fe sebesar 97,20%, BOD sebesar 78,39% dan COD sebesar 14,80%. Hasil pengujian keempat parameter yaitu BOD, Fe, Mn dan Zn sesuai dengan baku mutu lindi, sedangkan pengujian parameter COD belum memenuhi baku mutu yang ditentukan
CAPABILITY OF GREEN OPEN SPACE VEGETATION REDUCING CARBON EMISSIONS IN THE TRANSPORTATION SECTOR (CASE STUDY OF THE SIMPANG JAM AREA IN BANDA ACEH CITY)
Full text linkThe area of Bundaran BNI 46 Simpang Jam in Banda Aceh is an area that is often crowded with motorized vehicles. Motor vehicles produce CO as their exhaust gas. Excessive levels of CO in the air can harm human health. CO can turn into CO2 in the air. Overrated CO2 in the environment can cause greenhouse gas effects and global warming. CO2 can be absorbed by plants for their use in the photosynthesis process. The absorption of CO2 for each vegetation is different starting from very high to low. This research is a quantitative study to determine the total absorption capacity of vegetation in the area of Bundaran BNI 46 Simpang Jam on CO2 emissions which was done on April 2020. Calculating vehicle emissions and vegetation absorption using manual counts method at peak hours and calculations based on literature. From the research, it is known that the total number of vehicles passing through the area is 3250 motorized vehicles/hour with total emissions of 7,343,017,347 Kg/year. The total absorption capacity of 351 vegetation in that area is 614,410.30 kg/year. Accordingly, the area's vegetation is unable to absorb CO2 emissions optimally. To optimize CO2 absorption, vegetation replacement must be carried out. The tree combinations that can be selected to absorb all of the area's CO2 emissions are 320 Trembesi, 326 Kasia, 340 Glondokan, 305 Kenanga and 215 Beringin
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
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