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Search Results: 1 - 10 of 8433 matches for " Chengji Deng "
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The Statistical Analysis and Evaluation of Examination Results of Materials Research Methods Course  [PDF]
Wenjie Yuan, Chengji Deng, Hongxi Zhu, Jun Li
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37B042
Abstract: The statistical analysis and evaluation of examination results provide the theoretical basis for teaching quality and management. Materials research methods course is the key course for the undergraduates major in materials science and engineering. Based on the examination results of inorganic nonmetal materials engineering specialty students in the first term of 2011-2012 school year of Wuhan University of Science and Technology, the quantitative analysis for several parameters including difficulty, discrimination and reliability were investigated. The results indicate that the distribution of examination scores approximate to normal distribution. Difficulty of the exam paper belongs to median level, and discrimination of this is qualified as well as reliability. Thus it was concluded that the design of the examination paper was good and dependable.
Effects of SnO2 Addition on the Properties of Alumina-Magnesia Refractory Castables  [PDF]
Wenjie Yuan, Qingyou Zhu, Chengji Deng, Hongxi Zhu
New Journal of Glass and Ceramics (NJGC) , 2015, DOI: 10.4236/njgc.2015.51001
Abstract: Alumina-magnesia refractory castables have been widely used in the wall and bottom impact pad of steel ladles. The properties of alumina-magnesia refractory castables with SnO2 additive in 0 - 5 wt% range were investigated. The phase composition, microstructure, physical and mechanical properties of these refractories were studied. The results showed that the addition of SnO2 could have a great influence on the properties of alumina-magnesia refractory castables. The expansion, apparent porosity and strength of refractories with SnO2 were all more prominent than those of reference samples, which were attributed to the formation of CA6 and enhanced bonding. Meanwhile SnO2 could react with spinel and CA6 to form solid solution.
Fabrication of Al/Al2O3 composites and FGM
Fabrication of Al/Al_2O_3 Composites and FGM

Hong TAO,Chengji DENG,Lianmeng ZHANG,Runzhang YUAN,

材料科学技术学报 , 2001,
Abstract: Al/Al2O3 composites of different ratios were hot-press sintered at 575 similar to 640℃ under a pressure of 30 MPa for 2 h in a vacuum furnace. It was found that the relative density of the Al/Al2O3 composites could be increased evidently with the rise of sinter temperature. No reaction occurred between Al and Al2O3 at the sinter temperatures. Under 640℃-30 MPa-2 h experimental condition, Al/Al2O3 system FGM was successfully fabricated, and its density range changed quasi-continuously from 2.887x10(3) kg/m(3) to 3.1909x10(3) kg/m3 within the middle 1.0 mm thickness range.
Synthesis of β-Sialon from Coal Gangue
Xingyuan LUO,Jialin SUN,Chengji DENG,Yanruo HONG,

材料科学技术学报 , 2003,
Abstract: It is worth to study the synthesis of β-Sialon from coal gangue, because coal gangue is a waste of coal production andis a high quality kaolin contained carbon which is a perfect raw material of contained reducer itself for synthesis of β-Sialon. The study showed that a high conversion rate of 95% from coal gangue to β-Sialon could be obtained by usingprocess of carbothermal reduction nitridation when strictly controlled the thermodynamic conditions of synthesis. Forcontrolling the synthesis conditions easy, the details of the effects of Pco, Po2 and T on the conversion rate of β-Sialon were discussed detailedly and the phase diagrams of oxygen pressure vs composition for Si3N4-AlN-Al2O3-SiO2system at 1350, 1500, and 1600℃ were constructed in the paper.
The Resuming Insulation Discharge Failure and Conductor Overheating Failure Judgment Method of SF6 Electrical Equipment  [PDF]
Xiansheng ZHUANG, Zhi LI, Chengji HUANG
Energy and Power Engineering (EPE) , 2009, DOI: 10.4236/epe.2009.12019
Abstract: Through the long time track examination and disintegration to SF6 circuit breaker, we obtain the massive monitor data and massive pictures. The criteria of resuming insulation discharge failure conforming to CSO2/CH2S>7, is quite broad to SO2 and the H2S concentration permission. Even if it reaches 100µL/L, it will not be in danger immediately to the safe operation of equipment. We may plan, arrange, and overhaul calmly. When obtaining the bare conductor overheating failure, it has not involved the resuming insulation. We may use the resuming insulation discharge failure criterion.

LI Chengji,

材料研究学报 , 1988,
Abstract: An electron microscopical study has been performed on quenched bainite-austenite interfaces in 55SiMnMo steel.From these observations,it is conclu-ded that the bainiticferrite-austenite is more closely associated with theWidmanstatten ferrite-austenite in
Norm-attaining integral operators on analytic function spaces
Chengji Xiong,Junming Liu
Mathematics , 2012,
Abstract: Any bounded analytic function $g$ induces a bounded integral operator $S_g$ on the Bloch space, the Dirichlet space and $BMOA$ respectively. $S_g$ attains its norm on the Bloch space and $BMOA$ for any $g$, but does not attain its norm on the Dirichlet space for non-constant $g$. Some results are also obtained for $S_g$ on the little Bloch space, and for another integral operator $T_g$ from the Dirichlet space to the Bergman space.
The rate of increase of mean values of functions in weighted Hardy spaces
Chengji Xiong,Junming Liu
Mathematics , 2011,
Abstract: Let $0
Performance Comparison among ASK, FSK and DPSK in Visible Light Communication  [PDF]
Chengji Yao, Zengqiao Guo, Gongtao Long, Hongming Zhang
Optics and Photonics Journal (OPJ) , 2016, DOI: 10.4236/opj.2016.68B025
We consider the detection of Amplitude-Shift Keying (ASK), Frequency-Shift Keying (FSK) and Differential Phase-Shift Keying (DPSK) in Visible Light Communication (VLC). And their performance is compared according to data rate, transmission distance and incident angle respectively.

CHEN Jun,LI Chengji,ZHANG Shouhua,

材料研究学报 , 1988,
Abstract: The hydrogen embrittlement(HE)sensitivity and the HE fracture chara-cteristics of cold drawn 05Si2 ferrite-granular bainite(F-B_G)dual-phasewere investigated and compared with that of 05Si2 ferrite-martensite(F-M)dual-phase steel.Although F-B_G celd drawn
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