1,722,665 research outputs found
Morfologi Membran Datar Asimetris La0.7Sr0.3Co0.2Fe0.8O3-δ (LSCF 7328) Pasca Sintering Dengan Penambahan Aditif Polietilen Glikol (PEG)
Get PDFMembran datar asimetris La0.7Sr0.3Co0.2Fe0.8O3-δ (LSCF 7328) telah dibuat dengan metode inversi fasa rendam-endap dan sintering. Oksida perovskit LSCF 7328 disintesis dengan metode solid-state. Dalam pembuatan membran, polietersulfon (PESf) digunakan sebagai polimer perekat (polimer binder), N-metil-2-pirolidon (NMP) sebagai pelarut dan air sebagai non-pelarut (koagulan) dengan variasi konsentrasi polietilen glikol (PEG) sebagai aditif pengatur pori. Variasi PEG sebagai kontrol morfologi membran dilakukan pada berat molekul 300 dan 600 (Da) dengan konsentrasi sebesar 0,55; 1,00 dan 3,00%. Morfologi permukaan dan penampang lintang membran pasca sintering diamati menggunakan SEM. Hasil menunjukkan bahwa penambahan PEG sebagai aditif menghasilkan struktur pori yang cenderung berbentuk finger like dengan lapisan rapat yang tipis pada membran datar mentah asimetris LSCF 7328. Namun terdapat beberapa variasi yang menghasilkan struktur closed-macrovoid
Morfologi Membran Datar Asimetris La0.7Sr0.3Co0.2Fe0.8O3-δ (LSCF 7328) Pasca Sintering dengan Penambahan Aditif Polietilen Glikol (PEG)
No full textMembran datar asimetris La0.7Sr0.3Co0.2Fe0.8O3-δ (LSCF 7328) telah dibuat dengan metode inversi Fasa rendam-endap dan sintering. Oksida perovskit LSCF 7328 disintesis dengan metode solid-state. Dalam pembuatan membran, polietersulfon (PESf) digunakan sebagai polimer perekat (polimer binder), N-metil-2-pirolidon (NMP) sebagai pelarut dan air sebagai non-pelarut (koagulan) dengan variasi konsentrasi polietilen glikol (PEG) sebagai aditif pengatur pori. Variasi PEG sebagai kontrol morfologi membran dilakukan pada berat molekul 300 dan 600 (Da) dengan konsentrasi sebesar 0,55; 1,00 dan 3,00%. Morfologi permukaan dan penampang lintang membran pasca sintering diamati menggunakan SEM. Hasil menunjukkan bahwa penambahan PEG sebagai aditif menghasilkan struktur pori yang cenderung berbentuk finger like dengan lapisan rapat yang tipis pada membran datar mentah asimetris LSCF 7328. Namun terdapat beberapa variasi yang menghasilkan struktur closed-macrovoid
Uji Kompatibilitas Membran Lapis Ganda NiO/La0, 6Sr0, 4Co0, 2Fe0,8O3-δ (LSCF 6428), NiO/La0,7Sr0,3Co0,2Fe0,8O3-δ (LSCF 7328) dan NiO/La0,7Sr0,3MnO3-δ (LSM 73)
Get PDFPenelitian ini bertujuan untuk mengetahui kesesuaian atau kompatibilitas antara muai panas perovskit La0,6¬Sr0,4Co0,2Fe¬0,8O3-δ (LSCF 6428), La0,7Sr0,3Co0,2Fe¬0,8O3-δ (LSCF 7328) dan La0,7Sr0,3MnO3-δ (LSM 73) dengan NiO untuk dijadikan membran lapis ganda NiO/LSCF 6428, NiO/LSCF 7328 dan NiO/LSM 73. Serbuk perovskit telah berhasil disintesis dengan metode solid state. Pembuatan membran lapis ganda NiO/LSCF 6328, NiO/LSCF 7328 dan NiO/LSM 73 dilakukan dengan metode dry pressing. Sebelumnya dilakukan pembuatan dan karakterisasi membran tunggal LSCF 6428, LSCF 7328, LSM 73 dan NiO. Hasil yang diperoleh menunjukkan bahwa LSCF 7328 memiliki kerapatan tertinggi diikuti oleh LSM 73 dan LSCF 6428. Perbedaan kerapatan tersebut menyebabkan perbedaan pada kekerasan dan muai panas membran tunggalnya. Nilai koefisien muai panas LSCF 6428, LSCF 7328, LSM 73 dan NiO berturut-turut sebesar 22,155; 9,307; 10,135 dan 20,860 10-6.°C-1. Perbedaan/ketidakseuaian nilai muai panas ini menyebabkan delaminasi/keretakan pada membran lapis ganda yang disiapkan dengan metode dry pressing. Oleh karena itu dilakukan penambahan agen perekat berupa amilum pada lapisan perovskit. Penambahan amilum ini berhasil menyebabkan NiO dapat melekat pada lapisan perovskit.
=========================================================================================
The aims of this research are to study compatibility assessment about thermal expansion behavior of La0,6-Sr0,4Co0,2Fe¬0,8O3-δ (LSCF 6428), La0,7Sr0,3Co0,2Fe¬0,8O3-δ (LSCF 7328), La0,7Sr0,3MnO3-δ (LSM 73) and NiO to formed double layer membranes NiO/LSCF 6428, NiO/LSCF 7328 dan NiO/LSM 73. Perovskite powder was successfully synthesized by solid state reaction. Double layer membranes NiO/LSCF 6428, NiO/LSCF 7328 and NiO/LSM 73 were fabricated by dry pressing method. Forgoing, single layer membranes of LSCF 6428, LSCF 7328, LSM 73 and NiO were fabricated and characterized. The results showed that LSCF 7328 has the highest density then followed by LSM 73 and LSCF 6428. The difference of density of three single layer membranes also cause the different of hardness and thermal expansion behavior of the membranes. Thermal expansion coefficient (TEC) of LSCF 6428, LSCF 7328, LSM 73 and NiO were 22.155; 9.307; 10.135 and 20.860 10-6.°C-1, respectively. The different/incompatibility of TEC caused delamination or cracking of double layer membranes prepared by dry pressing method. Therefore, the adhesive agent (starch) had to added on perovskite membrane. The addition of this starch succeeds in causing NiO to be attached to the perovskite layer
The Community Land Model Version 5: Description of New Features, Benchmarking, and Impact of Forcing Uncertainty
No full text
Elevated carbon dioxide is predicted to promote coexistence among competing species in a trait-based model
No full textThe Sensitivity of North American Terrestrial Carbon Fluxes to Spatial and Temporal Variation in Soil Moisture: An Analysis Using Radar‐Derived Estimates of Root‐Zone Soil Moisture
No full textGoing 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
Optimizing mycelial growth of Trametes versicolor HBB 7328 for enzyme production and green energy
No full textTrametes versicolor, a common upper polyporus fungus, demonstrates mycelial growth that is influenced by temperature, pH, and media composition. This study aimed to optimize these conditions, as well as carbon and nitrogen sources, to enhance the mycelial growth of the white-rot fungus T. versicolor HBB 7328. This fungus shows significant potential for green energy applications due to its enzymatic activities. The research found that the fungus achieved maximal mycelial growth at 30°C (8.24 mm/day) and pH 7 (6.34 mm/day). Among various carbon sources, maltose resulted in the highest growth rate of 10.62 mm/day, whereas malt extract proved to be the most effective nitrogen source, supporting a growth rate of 8.96 mm/day. Enzymatic activity screening showed that T. versicolor HBB 7328 was positive for laccase, cellulase, protease, and xylanase activities. Notably, it exhibited substantial laccase activity (50.167 U/mL). These results are pivotal for developing pure cultures and conducting further studies on the enzymatic activities of T. versicolor HBB 7328. The high laccase activity, in particular, underscores its potential in biotechnological applications such as pollutant biodegradation and biofuel production, advancing green energy solutions
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
- …
