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Online since: June 2014
Authors: Guo Min Lin, Miao Shang, Wen Guang Zhang
Due to it is limited by material performance and structure of the cutting tool, equipment processing capacity, it is difficult to complete for high strength, high tenacity, high hardness, high brittleness, high temperature resistance and magnetic properties of new materials, and complex, subtle and difficult to process in components shape processing using the traditional processing method.
It is the use the principle of physics and chemistry to combing with different materials together. according to the mechanism of action it can be dividedeposition, injection, jointed.
The development trend of the precision and special processing technology In the new type of aircraft, weapons equipment, a lot of new structure and materials are used to provide a broad application prospect for the development of precision and special processing technology.
Conclusion Precision and special processing is a kind of integration technology integrating mechanical, electrical, physics, chemistry, mechanics, computer control, etc.
It is the use the principle of physics and chemistry to combing with different materials together. according to the mechanism of action it can be dividedeposition, injection, jointed.
The development trend of the precision and special processing technology In the new type of aircraft, weapons equipment, a lot of new structure and materials are used to provide a broad application prospect for the development of precision and special processing technology.
Conclusion Precision and special processing is a kind of integration technology integrating mechanical, electrical, physics, chemistry, mechanics, computer control, etc.
Online since: May 2014
Authors: Huan Ke, Hao Zhang, Shu Wang Duo, Ting Zhi Liu
Introduction
Buffer layer is a key layer of the internal structure of CIGS solar cells.
Its main functions include: 1) It can buffer structures, to minimize interfacial lattice mismatch; 2) It also plays a role as resistance, preventing the internal short-circuit of the solar cells; 3) It can protect CIGS [1] absorption layer, avoiding the damage to CIGS absorption layer from sputtering ZnO.
Materials Chemistry and Physics, 90(2005) 106-110
Journal of Physics and Chemistry of Solids, 66(2005) 1862-1864
Its main functions include: 1) It can buffer structures, to minimize interfacial lattice mismatch; 2) It also plays a role as resistance, preventing the internal short-circuit of the solar cells; 3) It can protect CIGS [1] absorption layer, avoiding the damage to CIGS absorption layer from sputtering ZnO.
Materials Chemistry and Physics, 90(2005) 106-110
Journal of Physics and Chemistry of Solids, 66(2005) 1862-1864
Online since: September 2013
Authors: Wei Ren Chen, Yang Sheng Lin, Huai Yi Chen
*hychen@cc.hfu.edu.tw
Keywords: titanium dioxide film, radio frequency sputtering, zinc oxide film, nanorod structure, hydrothermal reaction, and high-temperature annealing
Abstract.
Results, measured from field emission scanning electron microscope (FE-SEM), showed that the structure arrangement of TiO2 nanorods was affected by TiO2 film thickness, oxygen flow rate and annealing temperature.
Meanwhile, more apparent variations start to appear on the surface structure of TiO2 film after 400 oC high temperature annealing.
In addition, TiO2 film surface structure will expand more outwards with increasing film thickness.
Boschloo: Journal of Electroanalytical Chemistry 605 (2007) 151–156
Results, measured from field emission scanning electron microscope (FE-SEM), showed that the structure arrangement of TiO2 nanorods was affected by TiO2 film thickness, oxygen flow rate and annealing temperature.
Meanwhile, more apparent variations start to appear on the surface structure of TiO2 film after 400 oC high temperature annealing.
In addition, TiO2 film surface structure will expand more outwards with increasing film thickness.
Boschloo: Journal of Electroanalytical Chemistry 605 (2007) 151–156
Online since: January 2012
Authors: Oleg S. Khlybov, Igor V. Dubinin
Only “cautious” corrections of the temperatures are permissible so far (deviation from predefined level not more than ±30 degrees for each temperature) and the main aim of them is to set off the influence of chemistry variations on mechanical properties scatter of a given steel grade.
The structure of the directed graph can mimic the causal structure of the modeled domain, although this is not necessary.
· the structure of a Bayesian model is entirely determined by a researcher as it is in a phenomenological approach.
Thus the structure of a model doesn’t depend on a the data sample through statistical tests.
Complex Mathematical Model for predicting mechanical properties and structure of steel sheets.
The structure of the directed graph can mimic the causal structure of the modeled domain, although this is not necessary.
· the structure of a Bayesian model is entirely determined by a researcher as it is in a phenomenological approach.
Thus the structure of a model doesn’t depend on a the data sample through statistical tests.
Complex Mathematical Model for predicting mechanical properties and structure of steel sheets.
Online since: November 2011
Authors: Yong Ming Sun, Hong Ling Chen
The structure of the target compound was confirmed by 1HNMR and elemental analysis.
Fig.1 shows the molecular structure of investigated compound, which has been designated as BIMGCS12-3.
Its structure was confirmed by 1HNMR and elemental analysis.
Results and discussion Chemical structure.
The chemical structure of the prepared cationic Gemini surfactant was confirmed by 1H NMR spectra and elemental analysis.
Fig.1 shows the molecular structure of investigated compound, which has been designated as BIMGCS12-3.
Its structure was confirmed by 1HNMR and elemental analysis.
Results and discussion Chemical structure.
The chemical structure of the prepared cationic Gemini surfactant was confirmed by 1H NMR spectra and elemental analysis.
Online since: June 2015
Authors: R. Mary Jeya Jothi
Applications of Super Strongly Perfect Graph for Manufacturing System towards a Leaner Structure
Dr.
Some restructuring decisions are conceptualized which reflect the aim of the organization to gradually evolve the manufacturing system towards a leaner structure.
A study on some classes of super strongly perfect graphs like wheel and double wheel graphs (in which each graph represents structure of some manufacturing system) are given. 1.
Subsequently, the graph theory has been applied in various fields of engineering such as physics, chemistry, mathematics, electrical engineering, sociology, computer technology (net working), economics, operation research, linguistics etc.
Different alternative structures may be compared, ranked and selected for system wide optimization [7].
Some restructuring decisions are conceptualized which reflect the aim of the organization to gradually evolve the manufacturing system towards a leaner structure.
A study on some classes of super strongly perfect graphs like wheel and double wheel graphs (in which each graph represents structure of some manufacturing system) are given. 1.
Subsequently, the graph theory has been applied in various fields of engineering such as physics, chemistry, mathematics, electrical engineering, sociology, computer technology (net working), economics, operation research, linguistics etc.
Different alternative structures may be compared, ranked and selected for system wide optimization [7].
Online since: September 2014
Authors: Hong Xia Wang, Qing Hua Zhang, Hong Hui Sun
Based on the theory of quantum mechanics and the atomic structure of carbon nanotubes, the electronic energy bands and absorption spectrum of carbon nanotubes are analyzed in this paper, the results show that carbon nanotubes of different size correspond with absorption spectrum of different wave bands, and the computational results are afforded for the bases of designing wave-absorption materials.
Introduction In 1991, the professor Iijima of japonic company NEC had electronic lens study on cathode sediment that been made by Carbon stick discharge, and the carbon nanotubes(CNTs)was discovered for the first time[1-2], then the study upsurge of CNTs come into being in the field of materials and chemistry.
The carbon nanotubes has not only fine characteristics of graphite, for example heat resisting, erode resisting, heat impact resisting, heat and electric conduction and high intensity, but also the own characteristics of carbon nanotubes that are little dimension effect, surface effect, quanta dimension effect and helix tubular structure, and it has the unusual characteristics of electromagnetism wave-absorption.
Based on the theory of quantum mechanics, the electronic energy spectrum and absorption spectrum of carbon nanotubes are analyzed in this paper, The electronic energy spectrum of carbon nanotubes When the carbon atoms form the condensed state structure of graphite crystal, the public electron p is also regarded as free electron, and the electronic energy spectrum of them is commonly regarded as consecutive energy bands.
When the graphite piece absorbs one photon its wavelength is l and the electrons in the energy level makes transition into high energy level, so the expression of wavelength of absorption light is showed as follows: (14) If the boundary effect can be neglected, then the electron p numbers per one unit area based on the atomic structure of the graphite.
Introduction In 1991, the professor Iijima of japonic company NEC had electronic lens study on cathode sediment that been made by Carbon stick discharge, and the carbon nanotubes(CNTs)was discovered for the first time[1-2], then the study upsurge of CNTs come into being in the field of materials and chemistry.
The carbon nanotubes has not only fine characteristics of graphite, for example heat resisting, erode resisting, heat impact resisting, heat and electric conduction and high intensity, but also the own characteristics of carbon nanotubes that are little dimension effect, surface effect, quanta dimension effect and helix tubular structure, and it has the unusual characteristics of electromagnetism wave-absorption.
Based on the theory of quantum mechanics, the electronic energy spectrum and absorption spectrum of carbon nanotubes are analyzed in this paper, The electronic energy spectrum of carbon nanotubes When the carbon atoms form the condensed state structure of graphite crystal, the public electron p is also regarded as free electron, and the electronic energy spectrum of them is commonly regarded as consecutive energy bands.
When the graphite piece absorbs one photon its wavelength is l and the electrons in the energy level makes transition into high energy level, so the expression of wavelength of absorption light is showed as follows: (14) If the boundary effect can be neglected, then the electron p numbers per one unit area based on the atomic structure of the graphite.
Online since: July 2011
Authors: Ai Hui Liu, Yue Bin Lin, Chun Bo Li, Yu Fu Zhu
Influence of Heat Treatment on the Structure and Performance of ATP and its Catalyzer
Yuebin Lin1,2,a, Chunbo Li1,b, Yufu Zhu1, Aihui Liu1
1Jiangsu Provincial Key Laboratory for Interventional Medical Devices.
Attapulgite belongs to Sepiolite family, it is a kind of chain structure having the fibrous layer of hydrated magnesium aluminum silicate minerals [8].
At 725˚C, a small endothermic peak appears, because ATP lost layer structure caused by hydroxyl water, from 850˚C there exist a exothermic peak.
(3) It can be seen from differential thermal analysis, attapulgite at 725˚C lost layer structure of hydroxyl water, while in the composite heat-treated at 850˚C, ATP lost the original structure and collapsed.
Vol. 35(2004), p.632 [15] Masanori Hirano, Chiaki Nakahara, Keisuke Ota, et al: Journal of Solid State Chemistry.
Attapulgite belongs to Sepiolite family, it is a kind of chain structure having the fibrous layer of hydrated magnesium aluminum silicate minerals [8].
At 725˚C, a small endothermic peak appears, because ATP lost layer structure caused by hydroxyl water, from 850˚C there exist a exothermic peak.
(3) It can be seen from differential thermal analysis, attapulgite at 725˚C lost layer structure of hydroxyl water, while in the composite heat-treated at 850˚C, ATP lost the original structure and collapsed.
Vol. 35(2004), p.632 [15] Masanori Hirano, Chiaki Nakahara, Keisuke Ota, et al: Journal of Solid State Chemistry.
Online since: December 2011
Authors: Wen Ping Jia, Fang Li, Huan Ying Li, Shu Li Bai
The researcher of Shanxi institute of coal chemistry prepared mesh-carbon nanotubes(MCNTs) via detonated-assistant chemical vapor methods, and this MCNTs were fabricated by twisted and knitted of different graphite nano-melt.
Different carbon nano-structures show different surfaces and channels, so they show different catalytic function.
The catalytic activity of different carbon nano-structures was investigated and it is helpful to know clear the relationship between the structure and its catalytic function via controlling its structure.
carbon nano-structures.
Through above research, the structure of MCNTs was most effective to the SCR reaction.
Different carbon nano-structures show different surfaces and channels, so they show different catalytic function.
The catalytic activity of different carbon nano-structures was investigated and it is helpful to know clear the relationship between the structure and its catalytic function via controlling its structure.
carbon nano-structures.
Through above research, the structure of MCNTs was most effective to the SCR reaction.
Online since: August 2012
Authors: Min Chen, Ai Xia Pan, Yin Yin Wu, Yu Fang, Lu Lu Xu
Pure 5-acetylacenaphthene was obtained and its structure was identified by GC/MS, FT-IR and 1H NMR spectra.
HPAs with Keggin structure are the most studied class within polyoxometalates, because they possess relatively high thermal stability and acidity [5].
Supported HPAs are important for many applications, because bulk HPAs have low specific structure area (1–10m2/g).
The phase purity and crystal structure of the obtained samples were examined by X-ray diffraction (XRD) using D8 Advance X-ray diffraction equipped with Cu-KR radiation (λ) 1.5406 (Å), employing a scanning rate of 0.02° s–1 in the 2θ range from 10 to 80°.
Preparation and characterization of supported H3PW12O40 on silica gel: a potential catalyst for green chemistry processes, Catal.
HPAs with Keggin structure are the most studied class within polyoxometalates, because they possess relatively high thermal stability and acidity [5].
Supported HPAs are important for many applications, because bulk HPAs have low specific structure area (1–10m2/g).
The phase purity and crystal structure of the obtained samples were examined by X-ray diffraction (XRD) using D8 Advance X-ray diffraction equipped with Cu-KR radiation (λ) 1.5406 (Å), employing a scanning rate of 0.02° s–1 in the 2θ range from 10 to 80°.
Preparation and characterization of supported H3PW12O40 on silica gel: a potential catalyst for green chemistry processes, Catal.