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Online since: August 2012
Authors: You Sheng Xu, Zhong Hou Xu, Shi Chen, Sa Zhang, Gen Hua Wu
The design principle and application of power resistor
with over temperature and over current protection function
Sa Zhang1,2, a, Zhonghou Xu2,b, Shi Chen2,b, Yousheng Xu2,b,
Genhua Wu1,c
1College of Chemistry and Chemical Engineering, Teachers College of Anqing, Anqing, Anhui 246011, P.R.
It has a compact structure innovatively which integrated thermal cutoff (called TCO as follows) and wire wound resistor in a tubular case, and called fusing resistor.
Fig.1 Structure schematic of wire wound fusing resistor ①ceramic tube ②alloy welding wire ③TCO and lead ④epoxy resin ⑤fusing agent Table 1 Dimension of wire wound fusing resistor Fig.1 showed the structure of wire wound fusing resistor in detail.
Table.1 list the dimension in detail for the structure for different power.
One lead of TCO is wired through some section of WWR to the end cap and closely linked together to form a series structure.
It has a compact structure innovatively which integrated thermal cutoff (called TCO as follows) and wire wound resistor in a tubular case, and called fusing resistor.
Fig.1 Structure schematic of wire wound fusing resistor ①ceramic tube ②alloy welding wire ③TCO and lead ④epoxy resin ⑤fusing agent Table 1 Dimension of wire wound fusing resistor Fig.1 showed the structure of wire wound fusing resistor in detail.
Table.1 list the dimension in detail for the structure for different power.
One lead of TCO is wired through some section of WWR to the end cap and closely linked together to form a series structure.
Online since: October 2012
Authors: Lin Zhang, Guan Jun Chang, Ye Wei Xu, Fang Hua Zhu, Jie Tang
Synthesis and Characterization of Poly(N-arylenebenzimidazole ketone)
Yewei Xu1, a, Jie Tang2, b, Guanjun Chang3, c, Fanghua Zhu4, d and Lin Zhang5, f
1 Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang, China
2 School of Chemistry and Chemical Engineering, Mianyang Normal University, Mianyang, China
3 Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang, China
4 Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang, China
5 Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang, China
axywchem@sina.com, bxyw_50407@163.com, cqdcgj@126.com, dfanghuazhu@sina.com, fzhlmy@sina.com
Keywords: Polybenzimidazole; Poly(N-arylenebenzimidazole ketone); Thermal Stability; Solubility
Abstract.
The chemical structure of PNABIK was confirmed by FT-IR, elemental analysis and 1H NMR.
The results show a good agreement with the proposed structures.
Thereby more efforts have been made to modify the polymer structures to improve the solubility.
These modifications are accomplished in two ways, either by synthetically modifying the monomers prior to polymerization or by the post-polymerization substitution of the polymer at the reactive benzimidazole N-H sites. [3] However, few papers were published on modifying the monomers prior to polymerization at the reactive benzimidazole N-H sites. [4] Hay et al firstly reported that the N-H group in benzimidazoles could undergo a C-N coupling reaction with activated halides to give linear polymers with high molecular weight under appropriate temperature, and the N-substituted homopolymers and copolymers have very high glass transition temperature and thermal stability. [5, 6] In addition, pursuing to explore higher molecular weight PBIs with different structures, carbonyl groups in the PBI polymers would be increased solubility and flexibility. [7] Base on these, in this paper, the synthesis of 1,4-bis(2-benzimidazolyl) benzene (BBIB) is reported along with the preparation of poly(N-arylenebenzimidazole
The chemical structure of PNABIK was confirmed by FT-IR, elemental analysis and 1H NMR.
The results show a good agreement with the proposed structures.
Thereby more efforts have been made to modify the polymer structures to improve the solubility.
These modifications are accomplished in two ways, either by synthetically modifying the monomers prior to polymerization or by the post-polymerization substitution of the polymer at the reactive benzimidazole N-H sites. [3] However, few papers were published on modifying the monomers prior to polymerization at the reactive benzimidazole N-H sites. [4] Hay et al firstly reported that the N-H group in benzimidazoles could undergo a C-N coupling reaction with activated halides to give linear polymers with high molecular weight under appropriate temperature, and the N-substituted homopolymers and copolymers have very high glass transition temperature and thermal stability. [5, 6] In addition, pursuing to explore higher molecular weight PBIs with different structures, carbonyl groups in the PBI polymers would be increased solubility and flexibility. [7] Base on these, in this paper, the synthesis of 1,4-bis(2-benzimidazolyl) benzene (BBIB) is reported along with the preparation of poly(N-arylenebenzimidazole
Online since: August 2005
Authors: Victor Ivanov, E.M. Kelder, A.V. Nikonov, N.M. Pivkin, O.F. Ivanova, A.I. Medvedev, J. Schoonman, Anton Sergeevich Kaygorodov
Influence of Dynamic Compaction on Structure and Mechanical
Strength of Composite Spinel-based (LiMn2O4, Li4Ti5O12) Foil Electrodes
V.V.
Structure.
Structure and adhesion strength of the electrode materials have been studied.
Materials treated under such regimes are characterized with the finest surface structure.
Anne: Journal of Solid State Chemistry 124 (1996), p. 83
Structure.
Structure and adhesion strength of the electrode materials have been studied.
Materials treated under such regimes are characterized with the finest surface structure.
Anne: Journal of Solid State Chemistry 124 (1996), p. 83
Online since: May 2015
Authors: Leila Ebrahimi, Mohsen Mehregan, Masoud Zare-Shehneh, Behnaz Toluei Nia, Hadi Zare-Zardini, Hossein Soltaninejad
Thus, increase of antimicrobial activity of Alumina will improve the application of this structure in implants.
Journal of Materials Chemistry B, 2014
Journal of Materials Chemistry, 1997. 7(8): p. 1581-1585
The Journal of Physical Chemistry B, 1998. 103(2): p. 299-303
Food Chemistry, 2012. 132(1): p. 419-427
Journal of Materials Chemistry B, 2014
Journal of Materials Chemistry, 1997. 7(8): p. 1581-1585
The Journal of Physical Chemistry B, 1998. 103(2): p. 299-303
Food Chemistry, 2012. 132(1): p. 419-427
Online since: September 2018
Authors: Nikolay I. Plusnin
As for the interface atomic structure, three cases were considered: 1) a polycrystalline interface; 2) an amorphous interface and 3) an epitaxial interface [2].
It is formed as some nanophase (in its structure) wetting layer (NWL) with a thickness up to several monolayers.
Brillson, The structure and properties of metal-semiconductor interfaces, Surf.
Plusnin, Atomic-Scale AES-EELS Analysis of Structure-Phase State and Growth Mechanism of Layered Nanostructures, Advances in Materials Physics and Chemistry. 6 (2016) 195- 210
Krylov, Formation, electronic structure, and stability of film nanophases of transition metals on silicon, Journal of Surface Investigation.
It is formed as some nanophase (in its structure) wetting layer (NWL) with a thickness up to several monolayers.
Brillson, The structure and properties of metal-semiconductor interfaces, Surf.
Plusnin, Atomic-Scale AES-EELS Analysis of Structure-Phase State and Growth Mechanism of Layered Nanostructures, Advances in Materials Physics and Chemistry. 6 (2016) 195- 210
Krylov, Formation, electronic structure, and stability of film nanophases of transition metals on silicon, Journal of Surface Investigation.
Online since: December 2011
Authors: Qian Guan, Xiao Hong Zhao, Jian Li
China
2Department of Chemistry,
College of Science, Northeast Forestry University, 150040, Harbin, P.
At last, the structure and properties were characterized using SEM, FT-IR, and absorption features.
And formed the network structure, which is good for the adsorption of non-ferrous groups.
Cellulosic aerogel with three-dimensional network structure permit MB molecules to enter into network structure to adsorb it.
The interior structure of lignocellulosic aerogel is three-dimensional network.
At last, the structure and properties were characterized using SEM, FT-IR, and absorption features.
And formed the network structure, which is good for the adsorption of non-ferrous groups.
Cellulosic aerogel with three-dimensional network structure permit MB molecules to enter into network structure to adsorb it.
The interior structure of lignocellulosic aerogel is three-dimensional network.
Online since: October 2013
Authors: Amirul Abd Rashid, Wai Yee Lee, Nor Hayati Saad, Chia Sheng Daniel Bien, M.A.S.M. Haniff
The crystal structure and morphology evolution are characterized by SEM and Raman while the carbon dioxide (CO2) sensing capability was tested by simple sensor fabrication .It was observed that the nanorods were initially coalesce in bundles before breaking up loosely towards the end of the hydrothermal process.
Insert (a) shows higher magnification of nanorods in bundle; and (b) disoriented nanorod structures.
Kijung : The Journal of Physical Chemistry C 111, no. 3 (2007), p. 1213-1218.
Insert (a) shows higher magnification of nanorods in bundle; and (b) disoriented nanorod structures.
Kijung : The Journal of Physical Chemistry C 111, no. 3 (2007), p. 1213-1218.
Online since: March 2013
Authors: Yan Shuang Meng, Fu Liang Zhu
The results of the XRD show that NiO nanowires are cube crystal structure.
[7] Deki S, Iizuka S, Mizuhata M, et al, Fabrication of Nano-structured Materials from Aqueous Solution by Liquid Phase Deposition[J].
Journal of Electroanalytical Chemistry, 2005, 584 (1) : 38-43
[7] Deki S, Iizuka S, Mizuhata M, et al, Fabrication of Nano-structured Materials from Aqueous Solution by Liquid Phase Deposition[J].
Journal of Electroanalytical Chemistry, 2005, 584 (1) : 38-43
Online since: October 2010
Authors: Chun Rong Wang, Zhu Fa Zhou, Yan Jie Li, Ran Ran Tian, Xiao Chun Dai
And it is widely used in physics, chemistry, biology and law fields of molecular structure, quality control, archaeology and so on.
As with many unique physical or chemical properties, the nanoparticles with core/shell structure have attracted extensive attention in materials science [7].
The α-Fe2O3 core/metal shell structure exhibits important application in various technological fields such as photonics, catalysis, medical therapy and sensing.
The morphology, size and structure of the α-Fe2O3/Ag nanoparticles were determined by field-emission scanning electron microscopy (SEM).
The α-Fe2O3/Ag core/shell structures are very uniform, well dispersed and the average grain diameter of the particles is 95 nm.
As with many unique physical or chemical properties, the nanoparticles with core/shell structure have attracted extensive attention in materials science [7].
The α-Fe2O3 core/metal shell structure exhibits important application in various technological fields such as photonics, catalysis, medical therapy and sensing.
The morphology, size and structure of the α-Fe2O3/Ag nanoparticles were determined by field-emission scanning electron microscopy (SEM).
The α-Fe2O3/Ag core/shell structures are very uniform, well dispersed and the average grain diameter of the particles is 95 nm.
Online since: January 2022
Authors: Vadim Borkovskih, Alexander V. Osadchy, Ivan S. Zherebcov, Valeriy V. Savin, Victoriia A. Chaika
Introduction
Carbon-carbon composite materials (CCCM) have attracted the attention of scientists from various fields, from chemistry, materials science and engineering to condensed matter physics, both in science and industry.
To achieve anisotropy of the properties of the final material, various types of carbon fiber textile structures are used. 2D, 3D 4D, 5D, 7D, 11D fabrics have been developed for reinforcement with composite materials from interwoven threads [8 - 11].
It can be assumed that the most extreme chemical transformations, which cause the beginning of the formation of the graphite structure, occur precisely at the second stage.
Protsenko, Radiation changes in the structure and properties of carbon-carbon composite materials, Physics and chemistry of material processing. 4(1991) 21 – 28 [4] S.A.
Ponomarev et al, Features of the formulation and solution of problems of optimization of the structure and composition of spatially reinforced carbon-carbon and carbon-ceramic composite structures of rocket technology.
To achieve anisotropy of the properties of the final material, various types of carbon fiber textile structures are used. 2D, 3D 4D, 5D, 7D, 11D fabrics have been developed for reinforcement with composite materials from interwoven threads [8 - 11].
It can be assumed that the most extreme chemical transformations, which cause the beginning of the formation of the graphite structure, occur precisely at the second stage.
Protsenko, Radiation changes in the structure and properties of carbon-carbon composite materials, Physics and chemistry of material processing. 4(1991) 21 – 28 [4] S.A.
Ponomarev et al, Features of the formulation and solution of problems of optimization of the structure and composition of spatially reinforced carbon-carbon and carbon-ceramic composite structures of rocket technology.