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Artykuły w czasopismach na temat „Pores of Kohn”

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Data publikacji: 4 czerwca 2021
Data aktualizacji: 19 lutego 2022

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1

Ng, Calvin SH, Rainbow WH Lau, Kelvin KW Lau, Malcolm J. Underwood, and Anthony PC Yim. "Defeating the pores of Kohn." Asian Cardiovascular and Thoracic Annals 22, no. 1 (January 2014): 102–4. http://dx.doi.org/10.1177/0218492312474454.

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2

Bastacky, J., and J. Goerke. "Pores of Kohn are filled in normal lungs: low-temperature scanning electron microscopy." Journal of Applied Physiology 73, no. 1 (July 1, 1992): 88–95. http://dx.doi.org/10.1152/jappl.1992.73.1.88.

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Interalveolar pores of Kohn, small uniform-sized epithelium-lined openings in alveolar walls of normal lung, have historically been demonstrated with electron-microscopic techniques that remove water. We show these pores to be present but almost invariably filled with material when water and surfactant are preserved in frozen hydrated lung examined with low-temperature scanning electron microscopy. In the normal mouse, 16 open empty pores per alveolus were found in instillation-fixed dried lung vs. less than 1 per alveolus in frozen hydrated lungs (P less than 0.001). In the normal rat, 13 por
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3

Lu, De-fu, Charles Stanley, German Nunez, and David Frazer. "A Mathematical Description of Pressures in Alveolar Pores of Kohn." Journal of Biomechanical Engineering 113, no. 1 (February 1, 1991): 104–7. http://dx.doi.org/10.1115/1.2894075.

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Small interalveolar holes within the lung are called pores of Kohn. Some researchers have correlated enlarged pore size with diseases, e.g. emphysema, that are characterized by tissue destruction. Mathematical models of the pressures generated in closed, fluid-filled and open, fluid-lined pores demonstrate that pressures capable of rupturing lung tissue can be developed in a pore due to the surface tension and shape of the air-liquid interface. Pore enlargement accompanied by tissue destruction is presented as a possible mechanism for the disease process observed during aging and the developme
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4

Oldham, Michael J., and Owen R. Moss. "Pores of Kohn: forgotten alveolar structures and potential source of aerosols in exhaled breath." Journal of Breath Research 13, no. 2 (March 27, 2019): 021003. http://dx.doi.org/10.1088/1752-7163/ab0524.

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5

Parra, Saundra C., Ricky Burnette, and Timothy Takaro. "Computer Reconstructions of Normal Human Alveoli From Serial Sections." Proceedings, annual meeting, Electron Microscopy Society of America 43 (August 1985): 312–13. http://dx.doi.org/10.1017/s0424820100118436.

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Portions of two adjacent normal human alveoli were reconstructed from serial sections in order to examine normal alveolar organization, including anatomical relationships among the different cell types, the connective tissue matrix and gaps in the alveolar septum. Computer reconstructions were prepared from montaged electron micrographs of serial sections. Rotation of these reconstructions in the x, y or z axes allowed examination of the alveoli from many different aspects other than the actual plane of sectioning. Anatomical relationships “between Type I and Type II epithelial cells, alveolar
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6

Peão, M. N. D., A. P. Águas, C. M. de Sá, and N. R. Grande. "Morphological Evidence for Migration of Particle-Laden Macrophages through the Interalveolar Pores of Kohn in the Murine Lung." Cells Tissues Organs 147, no. 4 (1993): 227–32. http://dx.doi.org/10.1159/000147509.

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7

Xi, Jinxiang, Mohamed Talaat, Hesham Tanbour, and Khaled Talaat. "Airflow and Particle Deposition in Acinar Models with Interalveolar Septal Walls and Different Alveolar Numbers." Computational and Mathematical Methods in Medicine 2018 (September 25, 2018): 1–18. http://dx.doi.org/10.1155/2018/3649391.

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Unique features exist in acinar units such as multiple alveoli, interalveolar septal walls, and pores of Kohn. However, the effects of such features on airflow and particle deposition remain not well quantified due to their structural complexity. This study aims to numerically investigate particle dynamics in acinar models with interalveolar septal walls and pores of Kohn. A simplified 4-alveoli model with well-defined geometries and a physiologically realistic 45-alveoli model was developed. A well-validated Lagrangian tracking model was used to simulate particle trajectories in the acinar mo
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8

Shimura, Sanae, Edwin S. Boatman, and C. J. Martin. "Effects of ageing on the alveolar pores of Kohn and on the cytoplasmic components of alveolar type II cells in monkey lungs." Journal of Pathology 148, no. 1 (January 1986): 1–11. http://dx.doi.org/10.1002/path.1711480103.

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9

Fukuoka, Junya, Akira Yoshikawa, Shuntaro Sato, Tomonori Tanaka, Mikiko Hashisako, Yukio Kashima, Tomoshi Tsuchiya, Naoya Yamasaki, Takeshi Nagayasu, and Hiroshi Yamamoto. "Breakdown of lung framework and an increase in pores of Kohn as initial events of emphysema and a cause of reduction in diffusing capacity." International Journal of Chronic Obstructive Pulmonary Disease Volume 11 (September 2016): 2287–94. http://dx.doi.org/10.2147/copd.s114281.

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10

Jin, Yongyang, and Genkai Zhang. "Fundamental Solutions of Kohn Sub-Laplacians on Anisotropic Heisenberg Groups and H-type Groups." Canadian Mathematical Bulletin 54, no. 1 (March 1, 2011): 126–40. http://dx.doi.org/10.4153/cmb-2010-086-1.

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AbstractWe prove that the fundamental solutions of Kohn sub-LaplaciansΔ+iα∂t on the anisotropic Heisenberg groups are tempered distributions and have meromorphic continuation in α with simple poles. We compute the residues and find the partial fundamental solutions at the poles. We also find formulas for the fundamental solutions for some matrix-valued Kohn type sub-Laplacians on H-type groups.
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11

Wang, Chao-Ge, Shi-Liang Liu, and Fang Wu. "Two new species of Perenniporia (Polyporales, Basidiomycota)." MycoKeys 69 (July 9, 2020): 53–69. http://dx.doi.org/10.3897/mycokeys.69.51652.

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Two new species of Perenniporia, P. pseudotephroporasp. nov. and P. subcorticolasp. nov., are introduced respectively from Brazil and China based on morphological characteristics and molecular data. Perenniporia pseudotephropora is characterised by perennial, pileate basidiocarps with distinctly stratified tubes, grey pores, tissues becoming dark in KOH, a dimitic hyphal system with slightly dextrinoid arboriform skeletal hyphae and broadly ellipsoid to subglobose, truncate, weakly dextrinoid, cyanophilous basidiospores, measuring 4.9–5.2 × 4–4.8 μm. Perenniporia subcorticola is characterised
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12

Puari, Aninda Tifani. "Laboratory solid waste from practical activity as activated carbon precursor for reducing methylene blue in the laboratory wastewater." Jurnal Temapela 3, no. 2 (May 31, 2021): 73–79. http://dx.doi.org/10.25077/temapela.3.2.73-79.2020.

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Activated carbon (AC) from agricultural waste has become one promising way to produce AC regarding to low price of the precursor and its effect to environment. In this research, the solid waste from the basic biology practical in UPT. Basic and Central Laboratory, Andalas University (Unand) was utilized as the precursor for producing low price AC. The activation was done by chemical activation using three different activating agents which were zink chloride (ZnCl2), phosphoric acid (H3PO4), potassium hydroxide (KOH). The carbonization process was done at temperature of 700°C. The precursor and
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13

Wu, Shuilin, Guanxiong Chen, Na Yeon Kim, Kun Ni, Wencong Zeng, Yuan Zhao, Zhuchen Tao, Hengxing Ji, Zonghoon Lee, and Yanwu Zhu. "Creating Pores on Graphene Platelets by Low-Temperature KOH Activation for Enhanced Electrochemical Performance." Small 12, no. 17 (March 8, 2016): 2376–84. http://dx.doi.org/10.1002/smll.201503855.

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14

Kwiatkowski, Lech, Anna Kapuścińska, Alicja Bałkowiec, and Rafał Lutze. "Increasing the Surface Functionality of Mg Alloys by Means of Plasma Electrolytic Oxidation." Solid State Phenomena 227 (January 2015): 495–98. http://dx.doi.org/10.4028/www.scientific.net/ssp.227.495.

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The aim of this work which is a part of larger approach, is the surface functionalization by means of plasma electrolytic oxidation (PEO) as a pretreatment prior to the application of biopolymer. The process was developed for the number of magnesium alloys, and AZ31, RZ5 and ZM21 in particular. An oxide layer was formed in two step consecutive process in KOH-Na3PO4 and KOH-NaF solutions. The coatings are built from sub-layers: reach in F at the metal-coating interface containing small pores and top layer with larger pores. An important feature for the surface biocompatibility is a presence and
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15

Yao, Yong Zhao, Yukari Ishikawa, Yoshihiro Sugawara, and Koji Sato. "Removal of Mechanical-Polishing-Induced Surface Damages on 4H-SiC Wafers by Using Chemical Etching with Molten KCl+KOH." Materials Science Forum 778-780 (February 2014): 746–49. http://dx.doi.org/10.4028/www.scientific.net/msf.778-780.746.

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High temperature (>1000 °C) chemical etching using molten KCl or molten KCl+KOH as the etchant has been carried out to remove the mechanical-polishing (MP) induced damage layer from 4H-SiC surface. Atomic force microscopy observations have shown that line-shaped surface scratches that have appeared on the as-MPed surface could be completely removed by KCl-only etching or by KCl+KOH etching (KCl:KOH=99:1 in weight) at ~1100 °C. Between the two recipes, KCl+KOH etching has shown a higher etch rate (6~7 times) and is able to remove ~9 μm and ~36 μm-thick damage layer from the Si (0001) and the
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16

Kartikasari, Nurlisa, Rakhmawati Farma, and Awitdrus Awitdrus. "PENGARUH AKTIVASI KIMIA DENGAN BANTUAN IRADIASI GELOMBANG MIKRO TERHADAP SIFAT FISIS KARBON AKTIF DARI SEKAM PADI SEBAGAI ADSORBEN." Komunikasi Fisika Indonesia 15, no. 1 (April 30, 2018): 71. http://dx.doi.org/10.31258/jkfi.15.1.71-76.

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The percentage of KOH affects the quality of activated carbon. In this research the activated carbon has been made of biomass from rice husk by using the process carbonization, chemical activation using Potassium Hydroxide variated percentage for 5%, 10%, 15% and 20% from the mass of sample and microwave irradiation power by 450 Watt. The surface morphology of activated carbon for the sample KA10 produced the even pores structure and lots of pores more than sample KA5, KA15 and KA20. The analysis results of surface morphology of activated also supported by analysis atomic adsorption spectrosco
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17

Yuningsih, Lela Mukmilah, Dikdik Mulyadi, and A. Jaka Kurnia. "Pengaruh Aktivasi Arang Aktif dari Tongkol Jagung dan Tempurung Kelapa Terhadap Luas Permukaan dan Daya Jerap Iodin." Jurnal Kimia VALENSI 2, no. 1 (May 31, 2016): 30–34. http://dx.doi.org/10.15408/jkv.v2i1.3091.

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The activated charcoal can be produced from various raw material which contains carbon such as corn cobs and coconut shell. Generally, activated charcoal made through activation process with added chemical materials. The kind of activator will give different influence on surface area or pores volume of the result activated charcoal. In this study, will be made activated charcoal from corn cobs and activated by physical and chemical with KOH activator. Carbonation process is performed at 800oC for 2 hours and followed by chemical activation process by KOH with mass ratio water: charcoal: KOH is
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18

Putra Parmita, Ade Wahyu Yusariarta, Andromeda Dwi Laksono, Muhammad Iskandar Zulkarnain, Ansita Fitri Budi Hartanti, and Rizky Vi'atul Mudhawammah. "Karakteristik Buah Nipah Karbon Aktif dari Serabut Nipah Teraktivasi Potassium Hydroxide (KOH)." SPECTA Journal of Technology 4, no. 3 (December 4, 2020): 72–79. http://dx.doi.org/10.35718/specta.v4i3.232.

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Karbon aktif yang bersumber dari serabut buah nipah yang merupakan limbah yang belum dimanfaatkan dengan maksimal dibuat menggunakan metode aktivasi secara kimia menggunakan potassium hydroxide (KOH). Proses pembuatan karbon aktif dimulai dengan proses karbonisasi dilakukan dengan temperatur 400oC kemudian diaktivasi dengan kosentrasi KOH 1,5M. Hasil aktivasi KOH dibandingkan dengan hasil dari karbonisasi. Diperoleh hasil secara FTIR yang menunjukkan masih terdapat gugus fungsi yang menunjuukan adanya lignoselulosa dan sudah terbentuk grafit. Hasil XRD juga menunjuukan terbentuknya graphite am
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19

LIU, GUO-HUA, XIAO-HONG JI, YONG-PING WANG, and JIA-JIA CHEN. "A new species of Fulvifomes (Basidiomycota) from China." Phytotaxa 470, no. 2 (November 3, 2020): 194–202. http://dx.doi.org/10.11646/phytotaxa.470.2.8.

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Fulvifomes submerrillii (Hymenochaetaceae, Basidiomycota) is described from China based on both of morphological evidence and molecular data. The new species is characterized by perennial, pileate basidiocarps, encrusted, smooth pileal surface, 6–7 pores per mm with thick dissepiments, a dimitic hyphal system with interwoven skeletal hyphae, absence of setae or setal hyphae, ventricose cystidioles, and broadly ellipsoid, yellowish brown, thick-walled, smooth basidiospores, 4.7–5 × 3.7–4 μm. Phylogenetic analysis inferred from ITS and nLSU sequences indicates that the new species forms a separa
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20

BIAN, LU-SEN, CHANG-LIN ZHAO, and FANG WU. "A new species of Skeletocutis (Polyporales, Basidiomycota) from Yunnan of China." Phytotaxa 270, no. 4 (August 24, 2016): 267. http://dx.doi.org/10.11646/phytotaxa.270.4.3.

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A new species of Polyporales, named as Skeletocutis yunnanensis, was collected on angiosperm wood in northern Yunnan Province, southwestern China. It is described based on morphological characteristics and molecular evidence. The species belongs to the Skeletocutis subincarnata complex, but differs morphologically from all known species of the genus by white, cream to buff pores surface, angular pores mostly 5–6 per mm with entire mouths, a dimitic hyphal structure both in trama and subiculum, generative hyphae in whole basidiocarps covered by fine crystals, skeletal hyphae unchanged in KOH, n
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21

Sharon, Maheshwar, Ritesh Vishwakarma, Abhijeet Rajendra Phatak, Golap Kalita, Nallin Sharma, and Madhuri Sharon. "Microwave wide band absorption by carbon from Corn cob-1." JOURNAL OF ADVANCES IN PHYSICS 12, no. 2 (August 30, 2016): 4204–12. http://dx.doi.org/10.24297/jap.v12i2.53.

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Corn cob, an agricultural waste, is paralyzed at different temperatures (700oC, 800oC and 900oC). Microwave absorption of carbon in the frequency range of 2 GHz to 8 GHz is reported. Carbon activated  with 5% nickel nitrate showed more than 90% absorption of microwave in the frequency range from 6 GHz to 8 GHz, while carbon activated  with 10% Nickel nitrate treated corn cob showed 90% absorption in the frequency range of 2.5 GHz to 5 GHz. Carbon showing the best absorption are characterized by XRD, Raman spectra and SEM . It is suggested that corn cob treatment  alone with KOH did not i
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Park, Jong-Hyeok, and Jin-Soo Park. "KOH-doped Porous Polybenzimidazole Membranes for Solid Alkaline Fuel Cells." Energies 13, no. 3 (January 21, 2020): 525. http://dx.doi.org/10.3390/en13030525.

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In this study the preparation and properties of potassium hydroxide-doped meta-polybenzimidazole membranes with 20–30 μm thickness are reported as anion conducting polymer electrolyte for application in fuel cells. Dibutyl phthalate as porogen forms an asymmetrically porous structure of membranes along thickness direction. One side of the membranes has a dense skin layer surface with 1.5–15 μm and the other side of the membranes has a porous one. It demonstrated that ion conductivity of the potassium hydroxide-doped porous membrane with the porogen content of 47 wt.% (0.090 S cm−1), is 1.4 tim
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23

Guan, Yuming, Jingbo Mu, Hongwei Che, Xiaoliang Zhang, and Zhixiao Zhang. "Preparation of hierarchical porous carbon with high capacitance." World Journal of Engineering 15, no. 3 (June 11, 2018): 323–29. http://dx.doi.org/10.1108/wje-05-2017-0110.

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Purpose The purpose of this study is to design carbon electrode materials for high performance electric double-layer capacitors (EDLCs) with pores that are large enough and have suitable pore size distribution for the electrolyte to access completely to improve EDLCs’ electrochemical performance. Design/methodology/approach This study develop an improved traditional KOH activation method, and a series of micro-meso hierarchical porous carbons have been successfully prepared from phenol formaldehyde resin by combining polyethylene glycol (PEG) and conventional KOH activation. Findings As eviden
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Alcaraz, Lorena, María Esther Escudero, Francisco José Alguacil, Irene Llorente, Ana Urbieta, Paloma Fernández, and Félix Antonio López. "Dysprosium Removal from Water Using Active Carbons Obtained from Spent Coffee Ground." Nanomaterials 9, no. 10 (September 25, 2019): 1372. http://dx.doi.org/10.3390/nano9101372.

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This paper describes the physicochemical study of the adsorption of dysprosium (Dy3+) in aqueous solution onto two types of activated carbons synthesized from spent coffee ground. Potassium hydroxide (KOH)-activated carbon is a microporous material with a specific Brunauer–Emmett–Teller (BET) surface area of 2330 m2·g−1 and pores with a diameter of 3.2 nm. Carbon activated with water vapor and N2 is a solid mesoporous, with pores of 5.7 nm in diameter and a specific surface of 982 m2·g−1. A significant dependence of the adsorption capacity on the solution pH was found, but it does not signific
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Zhang, Rui, Xiao Jia Duan, Quan Gui Guo, Bei Zhou, Xi Miao Liu, Ming Lin Jin, and Li Cheng Ling. "Effects of Ash Contents of Activated Carbon on the Performance of Electric Double Layer Capacitors." Advanced Materials Research 287-290 (July 2011): 1469–76. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1469.

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High surface area activated carbon (AC) obtained by KOH activation of petroleum coke was leached by HCl aqueous solution and the effects of the ash contents of AC on performance of electric double layer capacitors (ECs) in 3M KOH aqueous electrolyte and 1 M (C2H5)4NBF4/propylene carbonate electrolyte were investigated by cyclic chronopotentiograms and electrochemical impedance spectrometry (EIS). An equivalent circuit model based on a mixed kinetic and charge transfer control was proposed to fit EIS spectra. The model parameters were extracted by Marquardt best fitting. The series solution res
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Li, Xiya, Jieqiong Qiu, Yiqi Hu, Xiaoyuan Ren, Lu He, Nannan Zhao, Ting Ye, and Xueqin Zhao. "Characterization and comparison of walnut shells-based activated carbons and their adsorptive properties." Adsorption Science & Technology 38, no. 9-10 (September 10, 2020): 450–63. http://dx.doi.org/10.1177/0263617420946524.

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The production of low-cost biologically activated carbons (BACs) is urgent need of environmental protection and ecological sustainability. Hence, walnut shells were treated by traditional pyrolysis, direct KOH impregnation and combined activation composed of hydrothermal carbonization and two-step H3PO4- and pyrolysis-activation process to obtain porous carbon with high adsorption capacity. It was found that the best adsorption capacity for iodine and organic dye methylene blue (MB) can be obtained using the KOH impregnation at impregnation ratio of 1:1 or combined activation comprising of 2 h
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27

Farma, Rakhmawati. "Physical Properties Analysis of Activated Carbon from Oil Palm Empty Fruit Bunch Fiber on Methylene Blue Adsorption." Journal of Technomaterials Physics 1, no. 1 (February 28, 2019): 67–73. http://dx.doi.org/10.32734/jotp.v1i1.824.

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The present research was conducted to analyze the physical properties of activated carbon from oil palm empty fruit bunch fiber (OPEFBF) to be applied as methylene blue adsorbent material. The OPEFBF was pre-carbonized at 280oC for 4 hours in vacuum, milled, and sieved to obtain the self-adhesive carbon grain (SACG) with a size less than 106 µm. The chemical activation was done using potassium hydroxide (KOH) with variations of 25%, 50%, and 75% from the SACG weight, stirred at 400 rpm for 24 hours at room temperature and pyrolyzed using microwave irradiations at the output power of 720 W for
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Nishinaka, K., S. A. Salman, K. Kuroda, and M. Okido. "Characterization and Structure Analysis of the Anodic Film Formed on AZ31 Mg Alloy in KOH Alkaline Solution with Various Additives." Key Engineering Materials 786 (October 2018): 159–64. http://dx.doi.org/10.4028/www.scientific.net/kem.786.159.

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AZ31B Mg alloy was anodized under the current density of 20 mA cm-2 for 3.6 ks in KOH alkaline solutions contains 0.60 M KF, 0.09 M Na3PO4.12H2O, 0.45 M Al (OH)3and 0.13 M KMnO4at 298 °C. Pores structure anodic film was formed on magnesium alloy surface; the pours structure was also observed in the lower part of the anodic film. The anodic film consisted of MgO and MgAl2O4. The anodized film showed higher pitting potential from anodic polarization measurement in 0.1 M NaCl solution compared to non-anodized magnesium alloy specimen and leads to improve the corrosion resistance of anodized AZ31
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Jia, Hong Min, Yan Hui Wang, and Guo Zhong Xu. "Study on Optimization of Activated Carbon Preparation Process Based on Apricot Shell." Advanced Materials Research 785-786 (September 2013): 739–44. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.739.

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Activated carbon is a kind of material with many pores and large specific surface. Activated carbon has been widely applied in many fields for its excellent adsorption and steady chemical characters. Activated carbon was prepared with apricot shell as raw materials by the sequence of crushing, screening, carbonization and activation. To improve adsorption ability of activated carbon, KOH was added as a activator into the carbonization materials. The effect of carbonization and activation conditions on benzene value and Vitamin B12 value were investigated. Benzene value and Vitamin B12 value of
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Chakraborty, Dyutiparna, Alfredo Vizzini, and Kanad Das. "Two new species and one new record of the genus Tylopilus (Boletaceae) from Indian Himalaya with morphological details and phylogenetic estimations." MycoKeys 33 (April 13, 2018): 103–24. http://dx.doi.org/10.3897/mycokeys.33.23703.

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Tylopilushimalayanus and T.pseudoballoui are described as new species from two Himalayan states (Sikkim and Uttarakhand) in India. Tylopilushimalayanus is characterised by a unique combination of features: reddish- or brownish-grey to purplish-grey then brown to reddish-brown or darker pileus, absence of olive or violet tinges on stipe surface, angular pores, stipe without reticulum or rarely with a faint reticulum restricted to the very apex, bitter taste of the context and positive macrochemical colour reaction of the stipe context with KOH (dark orange) and FeSO4 (dark green), medium sized
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Tippayasam, Chayanee, Phachongkit Boonanunwong, Jocelyn Calvez, Parjaree Thavorniti, Prinya Chindaprasirt, and Duangrudee Chaysuwan. "Effect of Porosity and Pore Size on Microstructures and Mechanical Properties of Metakaolin Blended with Ca(OH)2 and PLA as Porous Geopolymers." Key Engineering Materials 690 (May 2016): 276–81. http://dx.doi.org/10.4028/www.scientific.net/kem.690.276.

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Geopolymer is generally made of pozzolanic materials and alkali activators such as sodium alkali or potassium alkali. It can be solidified at ambient temperature to be developed as construction materials. Polylactic acid (PLA) was chosen to create pores in order for porous geopolymers. In this research, the porous geopolymer was developed either to reduce the weight of materials or to be utilized as thermal insulation materials. It was performed by metakaolin (MK), calcium hydroxide (Ca(OH)2), 10 molar potassium hydroxide (10M KOH) and potassium silicate (K2SiO3) for geopolymer pastes. These g
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Hu, Fang Yuan, Si Yang Liu, Jin Yan Wang, Sheng Ming Li, and Xi Gao Jian. "Carbon Nanosheet Frameworks Derived from Pine Cone Shells as Sodium-Ion Battery Anodes." Materials Science Forum 956 (June 2019): 3–11. http://dx.doi.org/10.4028/www.scientific.net/msf.956.3.

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As a kind of green, environment-friendly and sustainable carbon material, biomass carbon has simple processing technology and undoubtedly been the best candidate for industrialization. Different activation processes can be used to change the internal microstructure of carbons, and design pores that facilitate ions transport and electrons conduction, thereby achieving the ultimate goal of improving electrochemical performance. Herein, we select the same activator (KOH) and activation time (3 h) but change the activation temperature (300 °C, 600 °C, 800 °C) to obtain biomass-derived carbon with
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Kandasamy, Ayshuwarya, Tamilselvi Ramasamy, Ayesha Samrin, Padmanathan Narayanasamy, Ramesh Mohan, Olha Bazaka, Igor Levchenko, Kateryna Bazaka, and Mandhakini Mohandas. "Hierarchical Doped Gelatin-Derived Carbon Aerogels: Three Levels of Porosity for Advanced Supercapacitors." Nanomaterials 10, no. 6 (June 17, 2020): 1178. http://dx.doi.org/10.3390/nano10061178.

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Nitrogen-doped graphene-based aerogels with three levels of hierarchically organized pores were prepared via a simple environmentally friendly process, and successfully tested in supercapacitor applications. Mesopores and macropores were formed during the aerogel preparation followed by carbonization and its chemical activation by potassium hydroxide (KOH). These mesopores and macropores consist of amorphous carbon and a 3D graphene framework. Thermal treatment at 700 °C, 800 °C, 900 °C in N2 atmosphere was done to etch out the amorphous carbon and obtain a stable N-doped 3D graphene. Specific
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34

Ohimor, E. O., D. O. Temisa, and P. I. Ononiwu. "Production of Activated Carbon from Carbonaceous Agricultural Waste Material: Coconut Fibres." Nigerian Journal of Technology 40, no. 1 (March 23, 2021): 19–24. http://dx.doi.org/10.4314/njt.v40i1.4.

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Activated carbon was produced from Cocos nucifera (coconut) fibers by carbonization and activation processes. The sample was first pretreated before carbonization and activation processes at 450°C and 700°C respectively in an electric furnace. Chemical activation using Potassium hydroxide (KOH) 4:1 (weight basis) was carried out to increase the activated carbon adsorption properties. The element contained in the sample was analyzed using the Energy Dispersive Spectroscopy (EDS) while the surface morphological composition was determined by Scanning Electron Microscope (SEM) and the chemical bon
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35

Park, Joon Woo, Ki Yong Ann, and Chang-Geun Cho. "Resistance of Alkali-Activated Slag Concrete to Chloride-Induced Corrosion." Advances in Materials Science and Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/273101.

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The corrosion resistance of steel in alkali-activated slag (AAS) mortar was evaluated by a monitoring of the galvanic current and half-cell potential with time against a chloride-contaminated environment. For chloride transport, rapid chloride penetration test was performed, and chloride binding capacity of AAS was evaluated at a given chloride. The mortar/paste specimens were manufactured with ground granulated blast-furnace slag, instead of Portland cement, and alkali activators were added in mixing water, including Ca(OH)2, KOH and NaOH, to activate hydration process. As a result, it was fo
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36

Shen, Yang, Luca Maurizi, Giuliana Magnacca, Vittorio Boffa, and Yuanzheng Yue. "Tuning Porosity of Reduced Graphene Oxide Membrane Materials by Alkali Activation." Nanomaterials 10, no. 11 (October 22, 2020): 2093. http://dx.doi.org/10.3390/nano10112093.

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The alkali-activation method allows for obtaining highly porous carbon materials. In this study, we explored the effect of activation temperature and potassium hydroxide concentration on the pore structure of reduced graphene oxide (rGO), as potential membrane material. Above 700 °C, potassium species react with the carbon plane of rGO to form nanopores. This activation process is deeply studied through DSC measurements and isothermal gravimetric analysis. The porosity of the formed materials consists of both micro- and mesopores, with most of the pores having a size smaller than 10 nm. The sp
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Park, Joon Woo, Sung In Hong, Hee Jun Yang, Thamara Tofeti Lima, and Ki Yong Ann. "Cement-Free Mortar Using Ground Granulated Blast-Furnace Slag with Different Alkali-Activators." Applied Mechanics and Materials 578-579 (July 2014): 1430–40. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.1430.

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The present study concerns a development of cement-free concrete using ground granulated blast-furnace slag (GGBS) with alkali-activators such as KOH, NaOH, and Ca (OH)2. To find out the development among three different activators, the concentration of hydroxyl ion was kept 0.5%, 1.0%, 1.5%, 2.0% and 3.0% by weight of binder irrespective of cations. The setting time was measured by penetration resistance immediately after casting of mortar. The development of compressive strength was measured at 7, 14, 28, and 91 days. The pore structure of cement-free mortar was examined by the mercury intru
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38

Deng, Jie, Jing Li, Shuang Song, Yanping Zhou, and Luming Li. "Electrolyte-Dependent Supercapacitor Performance on Nitrogen-Doped Porous Bio-Carbon from Gelatin." Nanomaterials 10, no. 2 (February 18, 2020): 353. http://dx.doi.org/10.3390/nano10020353.

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The carbon supercapacitance strongly relies upon the electrolyte’s nature, but the clear-cut structure–performance nexus remains elusive. Herein, a series of bio-carbons with gradually varied pore structure and surface chemistry are derived using a new salt template protocol (with eco-benign KNO3 as the template, activator, and porogen, and cheap gelatin as the carbon precursor), and are used as model systems to probe the dependence of the electrochemical mechanism of such nanocarbons on two typical electrolytes (KOH and EMIBF4). By only adjusting the KNO3 dosage, two pivotal figures of merit
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Bleyen, Nele, Steven Smets, Wim Verwimp, Katrien Hendrix, Xavier Sillen, and Elie Valcke. "Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching." MRS Advances 1, no. 62 (2016): 4103–8. http://dx.doi.org/10.1557/adv.2017.196.

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ABSTRACTIn Belgium, Eurobitum bituminized radioactive waste is an important intermediate-level long-lived waste form that contains, besides bitumen and radionuclides, large amounts of soluble salts (mainly NaNO3). Geological disposal in a water-saturated sedimentary formation will induce swelling of Eurobitum due to water uptake by the hygroscopic salts embedded in a highly efficient semi-permeable bitumen membrane. Initially, while there is still free space in the primary waste containers, free swelling will occur. To improve our understanding of the water uptake processes under free swelling
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40

Fomkin, Anatoly, Anatoly Pribylov, Ilya Men’shchikov, Andrey Shkolin, Oleg Aksyutin, Alexander Ishkov, Konstantin Romanov, and Elena Khozina. "Adsorption-Based Hydrogen Storage in Activated Carbons and Model Carbon Structures." Reactions 2, no. 3 (July 7, 2021): 209–26. http://dx.doi.org/10.3390/reactions2030014.

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The experimental data on hydrogen adsorption on five nanoporous activated carbons (ACs) of various origins measured over the temperature range of 303–363 K and pressures up to 20 MPa were compared with the predictions of hydrogen density in the slit-like pores of model carbon structures calculated by the Dubinin theory of volume filling of micropores. The highest amount of adsorbed hydrogen was found for the AC sample (ACS) prepared from a polymer mixture by KOH thermochemical activation, characterized by a biporous structure: 11.0 mmol/g at 16 MPa and 303 K. The greatest volumetric capacity o
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41

Giraldo, Liliana, and Juan Carlos Moreno-Piraján. "Synthesis of Activated Carbon Mesoporous from Coffee Waste and Its Application in Adsorption Zinc and Mercury Ions from Aqueous Solution." E-Journal of Chemistry 9, no. 2 (2012): 938–48. http://dx.doi.org/10.1155/2012/120763.

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We obtain activated carbons with high portion of meso pores using coffee residues as precursor for the application of adsorption of large adsorbates. Because of its natural properties, the coffee residue exhibited a large pore size. In this work, the coffee residue were impregnated with ZnCl2and KOH, and then carbonized under the nitrogen conditions and activated with CO2respectively. Obtained activated carbons are used in the adsorption of ions Hg(II) and Zn(II). These adsorbents are efficacious to remove these ions from aqueous solution, with monocomponent equilibrium adsorption capacities r
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42

Lianto, Michael, Sulistiyawati Dewi Kiniasih, Irma Septi Ardiani, Malik Anjelh Baqiyah, and Vania Mitha Pratiwi. "Nanocarbon from Rice Straw as Supercapacitor Electrode." Materials Science Forum 964 (July 2019): 180–84. http://dx.doi.org/10.4028/www.scientific.net/msf.964.180.

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Rice straw waste in Indonesia is abundant and not yet used optimally. The composition of rice straw is 40% cellulose, 30% hemicellulose, 15% silica and 15% lignin so it is potentially to be a raw material of active carbon and supercapasitor electrode. Many efforts has been done to increase the value of capacitance of electrode like increase the surface area with activation and milling process. In this research used the variation of activator substance and the variation of milling velocity, they are H3PO4 450 rpm, H3PO4 600 rpm, and KOH 450 rpm. The purposes of this research are identify and ch
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43

Lee, Kuan-Ching, Mitchell Shyan Wei Lim, Zhong-Yun Hong, Siewhui Chong, Timm Joyce Tiong, Guan-Ting Pan, and Chao-Ming Huang. "Coconut Shell-Derived Activated Carbon for High-Performance Solid-State Supercapacitors." Energies 14, no. 15 (July 27, 2021): 4546. http://dx.doi.org/10.3390/en14154546.

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Coconut shells, low-cost and renewable agro-wastes, were used as a starting material in the synthesis of hierarchical activated carbons via hydrothermal, KOH-activation, and carbonization techniques. The ratio of KOH to hydrochar was varied in a systemic manner to study how it influences the texture and electrochemical behavior of the capacitor. Coconut shell-based carbon coated on nickel foams presented a surface area of 1567 m2 g−1, with micropores as well as mesopores widely distributed. The sample showed superior electrochemical performance, attaining 449 F g−1 at 1 A g−1 in 6 M LiNO3 aque
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44

Garba, Abdurrahman, Hatijah Basri, and Noor Shawal Nasri. "Preparation and Characterization of Green Porous Palm Shell Based Activated Carbon by Two Step Chemical Activation Using KOH." Applied Mechanics and Materials 773-774 (July 2015): 1127–32. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.1127.

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The large quantity of agricultural waste materials that poses disposal challenge to our environment could be converted into useful products such as activated carbon (AC). Palm oil shell based porous AC was prepared by two step process using KOH as the chemical activant. Palm oil shell was carbonized at 800°C for 2 hours and activated using CO2 at same temperature for 1 hour which yield 23.27% fixed carbon. The AC was characterized by Langmuir surface area, BET surface area and pore volume of 410.7 m2/g, 350 m2/g and 0.2 cm3/g respectively, the FTIR analysis identified the presence of alkanes,
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45

Peristiwady, Teguh, Wulan Koagouw, Jianguo Du, and Petrus Christianus Makatipu. "MEGANTHIAS KINGYO (KON, YOSHINO AND SAKURAI, 2000) (PERCIFORMES: SERRANIDAE) FROM BITUNG, NORTH SULAWESI, INDONESIA: FIRST RECORD FROM THE SOUTHWESTERN PACIFIC OCEAN." Marine Research in Indonesia 40, no. 2 (March 24, 2016): 41–47. http://dx.doi.org/10.14203/mri.v40i2.74.

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Eight specimens of Meganthias kingyo were collected from Bitung, North Sulawesi, Indonesia between 2008 - 2010. The specimens were caught from about 70-150 m off Lembeh Island. M. kingyo differs from M. natalensis by having the following characteristics: pores lateral line scales (43 vs. 49); pectoral rays (16 vs. ii.14); body depth (47.1 vs. 51.9); head length (31.0 vs. 38.2), body depth (47.1 vs. 52.9), caudal peduncle depth (12.1 vs. 14.2), pectoral fin length (28.0 vs. 34.3), pelvic fin length (33.6 vs. 31.1), anal fin base length (19.4 vs. 22.2), caudal fin length (66.9 vs. 35.3) and long
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46

Popczyk, Magdalena, and B. Łosiewicz. "The Influence of Temperature of Electrodeposition on the Electrochemical Properties of Ni+MoS2 Composite Coatings." Solid State Phenomena 228 (March 2015): 237–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.228.237.

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The Ni+MoS2composite coatings were prepared by electrodeposition under galvanostatic conditions from the Ni-plating bath containing suspended MoS2powder (100 mesh). Investigations of hydrogen evolution reaction (HER) were carried out using steady-state polarization measurements and electrochemical impedance spectroscopy (EIS) in 5 M KOH solution on the coatings obtained at 30, 40, and 50°C. It was found that the kinetics of the HER on the Ni+MoS2coatings decreases with the increase in the electrodeposition temperature of the coatings. This effect is attributed to decreasing content of MoS2(fro
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47

Lahrar, E. H., O. El Ghadraoui, A. Harrach, M. Zouhairi, T. Lamcharfi, and E. H. El Ghadraoui. "Influence of Strontium on the Structural and Dielectric Properties of Hydrothermally Processed PbTiO3 Ceramic." Asian Journal of Chemistry 32, no. 3 (January 31, 2020): 597–601. http://dx.doi.org/10.14233/ajchem.2020.22363.

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Perovskite ceramic materials of the composition Pb1-xSrxTiO3 (PSxT) were prepared by hydrothermal process at a relatively low temperature. The solution of KOH favours the solubility of the precursors in solid state. Pressure and temperature are critical factors for the formation of pure perovskite PSxT phase. The reaction mixture in stoichiometric amount is put in an autoclave and treated at 180 ºC for 24 h. The powder obtained after grinding is treated at 400 ºC for 4 h. X-ray diffraction shows that the compounds crystallize in a pure phase of perovskite type. SEM morphology indicates a homog
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48

Arie, Arenst Andreas, and Joong Kee Lee. "Preparation of Capacitor’s Electrode from Coconut Shell." Advanced Materials Research 875-877 (February 2014): 1585–89. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1585.

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Activated carbons were prepared from coconut shell by chemical activation method and utilized as electrode materials for electrochemical double layer capacitor (EDLC). A preliminary characteristic of activated carbon from coconut shell includes the Brunnaeur Emmett Teller (BET) analysis and cyclic voltammetry measurements. The BET surface area is not affected by the variation of activation temperature as both of the samples showed BET surface area of about 850-870 m2g-1. The N2 adsorption–desorption isotherms showed that the sample exhibited type I characteristics according to IUPAC classifica
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49

LIU, ZHAN-BO, and YUAN YUAN. "Luteoporia citriniporia sp. nov. (Polyporales, Basidiomycota), evidenced by morphological characters and phylogenetic analysis." Phytotaxa 461, no. 1 (September 30, 2020): 31–39. http://dx.doi.org/10.11646/phytotaxa.461.1.4.

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A new poroid wood-inhabiting fungus in the Polyporales, Luteoporia citriniporia sp. nov., is described from Sri Lanka based on morphological and molecular evidence. L. citriniporia is characterized by an annual growth habit; resupinate basidiocarps with lemon yellow pores when fresh becoming buff to clay pink upon drying, a distinct snow white and fimbriate sterile margin, tissues becoming pink in KOH, a monomitic hyphal system, generative hyphae thin- to distinctly thick-walled, usually encrusted with fine yellow crystals, and oblong-ellipsoid to subcylindrical basidiospores measuring 3.4–4.2
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Maconie, Robin. "CARE TO LISTEN: MILTON BABBITT AND INFORMATION SCIENCE IN THE 1950S." Tempo 65, no. 258 (October 2011): 20–36. http://dx.doi.org/10.1017/s0040298211000362.

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Following Milton Babbitt's untimely death at the age of 94 (death at any age is untimely, since it unties the time dimension) in January 2011, I was interested in finding out more about his relationship, personal and music-theoretical, with the US information science community during and after the Eisenhower years. The musical avant-garde represented in parody by Babbitt and Cage as two poles of an antithesis sprang into life in the Cold War era at the same time as Scientology, MAD and Playboy magazine. Today the US doyen of priapism is ready to admit that even the best formula for a creative
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