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Online since: January 2013
Authors: Li Qiang Lv, Lin Ji
Spatial Heterogeneity Induced Antispiral Wave and Spatiotemporal Coherence Resonance Liqiang Lv 1, a and Lin Ji 2,b* 1 College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China 2 Department of Chemistry, Capital Normal University, Beijing 100048, China a Liqiang_lv@126.com, bjiln@mail.cnu.edu.cn Keywords: Spiral wave; Spatial noise, Nonlinear dynamics, Spatiotemporal coherence resonance.
To quantitatively discuss the STCR phenomenon, we employed the weighted windowing spatial autocorrelation (WWSAC) in Ref. [24] to characterize the spatiotemporally ordered wave structure.
Similar results are also found in the investigation of noise influenced Turing pattern formation [20] and noise sustained spiral wave [24], where the spatiotemporal noise is found to be favorable to sustain the ordered structure than temporal or spatial noise.
Online since: January 2012
Authors: Yan Huang, Chan Wang
Towards fabrication of low-cost carbon/ceramics membranes: Substrate modification Chan Wang, Yan Huang* State Key Laboratory of Materials-oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, China
In the present work, we also fabricated carbon membrane directly on the unmodified substrate under the same condition for reference. 2.2 Characterization The substrate pore structure was measured by bubble-point method on pore size distribution analyzer [9].
Fig. 2 SEM micrographs of (a) the unmodified substrate and (b) the modified substrate (Embedded, FESEM micrograph). 3.2 Membrane structure and morphology 3.2.1 Membrane morphology analysis Fig. 3a and c reveal the C/Al2O3 is grey and poorly lustrous, while the C/Pencil/Al2O3 is black and highly lustrous.
Online since: October 2012
Authors: Kugalur Shanmugam Ranjith, Ramasamy Thangavelu Rajendrakumar, Ramanathaswamy Pandian, Gomathi Natarajan, Mohammed Kamruddin
Introduction The synthesis of one-dimensional nano-structures of semiconducting materials is important because of their potential use in nanoscale electronic and optoelectronic devices [1].
By tuning the growth parameters the structure and alignment of ZnO NRs were controlled.
[3] Chin-Hsien Hung, Wha-Tzong Whang, A novel low-temperature growth and characterization of single crystal ZnO nanorods, Materials Chemistry and Physics. 82 (2003) 705-710
Online since: October 2018
Authors: Mikhail P. Kuz'min, V.V. Kondratiev, L.M. Larionov
For successful development of such technology, it is necessary to conduct both fundamental research connected with an understanding of physicochemical processes and mechanism of alloy structure formation, and also applied research aimed at creating an effective method for introducing SiO2 into aluminum alloy.
Ivanov, Results of theoretical and practical study of flotation for nanosize silicon-containing structures” Zh.
Ailer, Silica Chemistry [Russian translation], Mir, Moscow, 1982
Online since: January 2021
Authors: Noboru Nakayama, Toi Aoki, Masaomi Horita, Hiroaki Fukui
Structure of experiment shows Fig. 1.
Fig. 1 Structure of experiment Fig. 2 Diagram of measuring Focused ion beam scanning electron microscopy (FIB-SEM).
Polley, B.B.S.T.Boonstra, CARBON BLACKS FOR HIGHLY CONDUCTIVE RUBBER, The Division of Rubber Chemistry of the American Chemical Society, 30(1), (1957), 170-179
Online since: January 2018
Authors: Rukkiat Jitchati, Kittiya Wongkhan, Chonchanok Talodthaisong
A Varied Alkyl Chains of Ruthenium(II) Complexes for Dye Sensitized Solar Cells (DSSCs) Chonchanok Talodthaisong, Kittiya Wongkhan and Rukkiat Jitchatia Organometallic and Catalytic Center (OCC), Chemistry Department, Faculty of Science, Ubon Ratchathani University, Thailand ae-mail: rukkiat_j@hotmail.com Keywords: Dye-syntizing solar cell (DSSC); Ruthenium(II) complex; Stability Abstract.
The molecular structures of target molecule are shown in Fig. 1.
Fig. 1 The chemical structures of ruthenium(II) complexes (PC01-PC03) Experimental The chemicals were purchased from commercial supply and used without further purification.
Online since: May 2006
Authors: A. Sousa e Brito, José M. Silva, Ricardo A. Cláudio, Carlos M. Branco, Jim Byrne
Superalloys were traditionally used in cast and wrought forms, but these production techniques have considerable disadvantages, as they lead to segregation mechanisms and lack of homogenization in the structure of the material, and to the presence of other types of detrimental defects (oxides, nitrides, pores, etc) [4].
Table 1 - Chemical composition of Udimet 720Li and RR1000 (% of weight, balance nickel) Alloy Cr Mo Ti Al Co Zr W Fe B C Ta Zr Hf U720Li 16.2 3.2 5.1 2.6 14.5 0.035 1.7 0.072 0.022 <0.1 RR1000 15 5 3.6 3.0 18.5 0.06 0.015 0.027 2.0 0.06 0.07 In the fabrication process of Udimet720Li, the powder material was isostatically heated, pressed and extruded; a solution treatment was subsequently applied, from which a uniform structure of fine grain was obtained, with a typical average grain size of about 6-7µm [6,11].
Hence, the better behaviour of RR1000 compared with Udimet 720Li, which is visible considering crack propagation curves in Fig. 1, can be possibly explained by a stress relaxation effect in the first material due to its alloy chemistry, as noticed by Pang et al. [6].
Online since: November 2007
Authors: Racquel Z. LeGeros, Ramin Rohanizadeh
A low percentage of Na (5.23%) was detected in the apatite coating, probably due to the partial incorporation of Na + ions into apatite structure (Na-for-Ca substitution) during the transformation of the monetite to apatite in NaOH solution.
X-ray diffraction demonstrates the crystal structure of each coating material.
An acidic solution also affects the topography and chemistry of the Ti surface.
Online since: April 2009
Authors: S. Mallarino, X. Feaugas, J. Bernard, Ludovic Douminge
Fluorescence spectroscopy is one of these techniques, that is extensively applied in various fields including physics, biochemistry, medicine, and chemistry [8-10].
Structure of rhodamine 6G.
The addition of Rh6G to the polymer structure has been check in terms of the mechanical behaviour and of the DSC results.
Online since: December 2010
Authors: Zuhailawati Hussain, Zainal Arifin Ahmad, Shamsul Baharin Jamaludin, Saidatulakmar Shamsuddin
From the microstructure in Fig. 3(c), it can be seen that no apparent pores are formed, showing a dense structure.
A sudden change in temperature causes expansion of the atomic structure of the sample that weakens the bonding of the atoms.
Gierl, Materials Chemistry and Physics, Vol. 67, Pp. 49-55