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Online since: March 2014
Authors: Jian Zhong Xiao, Li Hong Zhou, Feng Xia, Ying Chen, Xiang Dong Li
The sensor device has a simple structure.
(a) Cross-cut view of NH3 sensor structure and (b) schematic of the test apparatus Experimental Preparation of Mg2CuxFe1O3.5+x mixed metal oxides.
The calcined samples were kept in a desiccator in order to avoid the reconstruction of the hydroxide structure.
[8] Maekawa, T., Tamaki, J., Miura, N., et al., Chemistry Letters, 1992. 21(4): p. 639-642
Online since: May 2020
Authors: Misni Misran, Lai Ti Gew
Mixed Langmuir Monolayers of C18 Fatty Acids: Effect of Degree of Saturation Lai Ti Gew1,a* and Misni Misran2,b 1Department of Biological Sciences, School of Science and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500 Petaling Jaya, Selangor, Malaysia 2Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia ajaneg@sunway.edu.my, bmisni@um.edu.my Keywords: intermolecular interactions, membrane fluidity, nanolipososomes, drug delivery systems, nanotechnology.
Membrane proteins (such as integral or intrinsic proteins) were proposed to be globular in structure, and their interactions with membrane lipids were mainly due to hydrophobic forces, and the hydrophilic interactions between the lipid headgroups and hydrophilic side chains on proteins.
Chemical structures of C18 fatty acids, and some of their physical properties Name Stearic acid (18:0) Oleic acid (18:1) Linoleic acid (18:2) Linolenic acid (18:3) Molecular structure Molecular formula C18H36O2 C18H34O2 C18H32O2 C18H30O2 Molecular weight 284.48 g mol-1 282.46 g mol-1 280.45 g mol-1 278.44 g mol-1 Physical state Solid liquid liquid liquid Density 0.941 g ml-1 0.895 g ml-1 0.902 g ml-1 0.916 g ml-1 Boiling point 232.0°C 360.0°C 229.0°C 230.0°C Melting point 69.3°C 13.5°C -5.0°C -11.0°C Spreading solution of C18 fatty acids were prepared by dissolving it in analytical-grade CHCl3.
Online since: May 2010
Authors: Ge Hu, Wei Wang
The Research of Security Network Group Key Management Ge Hu 1,a , Wei Wang 1,b 1 College of Chemistry & Chemical Engineering, Chongqing University, Chongqing, China a huge@cqu.edu.cn,b cquhuge@163.com Keywords: Security; Key; Management Abstract: To improve the security and applicable capability of the group key management in 802.16e standard, the traditional group key management mechanism is discussed and the current security owing to lack of considering comprehensive factors, some security solutions designed also bring some problems.
The development of Wireless Metropolitan Area Network (WMAN) has come into a new phase with the IEEE 802.16e standard being released, that is, Wimax network will support mobility from the subscriber stations (SS), which bring the important and far-reaching influence both to Wimax network structure and to its network constructed fashion.
Wimax network structure can be described as Fig.1.
Fig.1 Group key management model in WiMax network structure In practice, the root node of multi-hop Wimax wireless network is the base station (BS), the workstation is located between the network and BS, with the function of transferring group key, the subscriber station (SS) is served as member node.
Online since: December 2010
Authors: Michael Josef Zehetbauer, Gerda Rogl, Peter Rogl, Ernst Bauer, Michael B. Kerber
Impact of Ball Milling and High-Pressure Torsion on the Microstructure and Thermoelectric Properties of p- and n-type Sb-based Skutterudites Gerda Rogl1,2,3,a, Michael Zehetbauer1,b, Michael Kerber1,c, Peter Rogl2,d, Ernst Bauer 3,e 1Physics of Nanostructured Materials, Univ. of Vienna, Boltzmanng. 5, A-1090 Wien, Austria 2Institute of Physical Chemistry, Univ. of Vienna,Währingerstr. 42, A-1090 Wien, Austria 3Institute of Solid State Physics, Vienna Univ.of Technology, Wiedner Hauptstrasse 8-10, A-1050 Wien, Austria agerda.rogl@univie.ac.at, bmichael.zehetbauer@univie.ac.at, cmichael.kerber@univie.ac.at, dpeter.franz.rogl@univie.ac.at, ebauer@ifp.tuwien.at Keywords: Bulk Nanostructured Materials, Ball Milling, High Pressure Torsion, Thermoelectric Properties Abstract For thermoelectrics it is important to produce thermodynamically stable bulk nanostructured materials.
There are various approaches to produce thermodynamically stable materials with nanoscale structures.
The volume-weighted averaged sizes are 47 nm and 105 nm, respectively, which shows clearly that HPT can achieve much smaller nanograin sized structures than BM-treatment (Fig. 2.)
Resistivity (a), Seebeck coefficient (b), thermal conductivity (c) and ZT (d) versus temperature for micro structured (open symbols) and nanostructured (filled symbols) skutterudites.
Online since: November 2014
Authors: Jing Fu Zhang, Kai Liu, Bo Wang, Rui Xue Hou, Jin Long Yang
The CSH was a kind of particle in the shape of fiber, which could structure a kind of network in good order in cement paste matrix (Fig.1a).
The C5S6H5 was a kind of good crystal with needle shape and also could interweave and join each other to build a kind of ideal and well-proportioned network structure in hardened paste for higher temperature conditions (Fig.1b).
CaCO3 in products generally presented the shape of granular crystal form (Fig.2a) and completely or partly damaged the network structure formed by original hydration products CSH or C5S6H5 (Fig.2b).
Oil field Chemistry,1996.16(4): 377-383
Online since: June 2015
Authors: S. Karabaev, A. Kharchenko, I. Lokshina, I. Gainullina, A. Dzhunushalieva, A. Pendin, Svetlana Lugovskoy
It indicates the affinity of their chemical structure.
It can be explained by insufficiency of these functional groups in the structure of humine in comparison with humic acid.
Calculation of structure parameters of humic acid and humine are presented in Table 3.
Oxredmetry. - Leningrad: Chemistry, 1975. – 304 p.
Online since: June 2014
Authors: Krishna Murari Pandey, Sukanta Roga
Comprehensive flow field visualization was presented clearly delimiting the vertical flow structures.
The ramp injector design was integrated with the combustor wall which allowed for shock structures promoting baroclinic torque generated vorticity.
The grid independent test is shown below: Grid size (Original / Adapted / Change) Cells (673074 / 2692296 / 2019222) Faces (1011801 / 4042824 / 3031023) Nodes (338728 / 1350529 / 1011801) Conclusions The computational analysis of 2D Ramp injector was carried out with k-Ɛ turbulence model for exposing the flow structure of progress of hydrogen jet through the areas disturbed by the reflections of oblique shock.
For that single step reaction kinetics has been used to model the chemistry.
Online since: May 2013
Authors: Yong Sheng Ding, Kuang Rong Hao, Jia Jia Chen
Fig.1 Model structure of the FKIGA-BP The whole steps of the FKIGA-BP: Step 1.
By changing input and output parameter index, we can predict properties of arbitrarily stage of carbon fiber manufacture through changing the BP module structure of the FKIGA-BP, adjust the produce parameters to keep the stability of production properties.
Fong: Materials Chemistry and Physics Vol. 122 (2010), p. 548 [3] Y.
Lostado: Engineering Structures Vol. 32 (2010), p. 3018 [6] K.
Online since: October 2011
Authors: Zhi Fen Li, Tai Ling Ma
Earthworm cast produced in the Process of earthworms digesting and absorbing of organic matter in sludge contains large amounts microbial community composition, complex organic chemistry and special physical structure, so it can improve the physical and chemical structure of the sludge and raise the rate of microbial decomposing sludge.
Process flow of earthworm bio-filter is simple and efficient, only one wastewater treatment line; but the conventional activated sludge processes need complex process, handling structures and equipment, such as the thickening tank, sludge storage tanks, aerobic digester, dewatering machines and so on.
Online since: July 2011
Authors: Wahyono Suprapto, Bambang Suharno, Dedi Priadi, Johny Wahyuadi Soedarsono
Result and Discussion During solidification, dissolved hydrogen that was removed and combined again as the gas molecules trapped in solid structures can cause porosity, especially in the area interdendritic.
Reference [14], provides the element Fe in aluminum alloys to form intermetallic phase that resulted in equiaxed grain structure.
Maijer, Modeling of microporosity formation in A356 aluminum alloy casting, Chemistry and Materials Science, Metallurgical and Materials Transactions B. (2006) Volume 37
Wilkinson, Effect of Thermomechanical Processing on Grain Structure Development in a Twin-Belt Strip Cast Automotive Aluminum Alloy, Metallurgical and Materials Transactions A. (2004) Volume 35A