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Search Results: 1 - 10 of 99311 matches for " Cong-Ping Chen "
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Run by Run Control of Time-pressure Dispensing for Electronics Encapsulation
Cong-Ping Chen,Han Ding,

国际自动化与计算杂志 , 2008,
Abstract: To alleviate the influence of gas compressibility on the process performance of time-pressure dispensing for electronics encapsulation, a predictive model is developed based on power-law fluid to estimate the encapsulant amount dispensed. Based on the simple and effective model, a run by run (RbR) supervisory control scheme is delivered to compensate the variation resulting from gas volume change in the syringe. Both simulation and experiment have shown that the dispensing consistency has been greatly improved with the model-based RbR control strategy developed in this paper.
Modeling and Control of Time-pressure Dispensing for Semiconductor Manufacturing
Cong-Ping Chen,Han-Xiong Li,Han Ding,

国际自动化与计算杂志 , 2007,
Abstract: To improve the consistency of the adhesive amount dispensed by the time-pressure dispenser for semiconductor manu- facturing,a non-Newtonian fluid flow rate model is developed to represent and estimate the adhesive amount dispensed in each cycle. Taking account of gas compressibility,an intelligent model-based control strategy is proposed to compensate the deviation of adhesive amount dispensed from the desired one.Both simulations and experiments show that the dispensing consistency is greatly improved by using the model-based control strategy developed in this paper.
Recycling MF Solid Waste into Mesoporous Nitrogen-doped Carbon with Iron Carbide Complex in Graphitic Layers as An efficient Catalyst for Oxygen Reduction Reaction

ZHAO Can-yun
, HUANG Lin,YOU Yong,YAO Ying-fang,SU Xiao-gang,WAN Hong, LIU Jian-guo,WU Cong-ping

- , 2016, DOI: 10.13208/j.electrochem.151145
Abstract: 摘要 在燃料电池阴极催化剂的研究中,FeNx/C材料与目前广泛应用在燃料电池中的Pt基催化剂相比,不仅价格低廉,而且表现出良好的氧还原催化活性. 尽管如此,设计合成性能高、成本低的FeNx/C催化剂仍面临巨大挑战. 在此,作者提出废物利用的方法,以三聚氰胺甲醛树脂固体废物为前驱体,合成了具备介孔结构和较大的比表面积的非贵金属催化剂. 经酸性条件半电池测试,这种电催化剂的氧还原催化活性接近5%商业Pt/C性能. 本文工作为三聚氰胺甲醛树脂固体废弃物处理提供了新思路.
Nitrogen-doped carbon materials with iron ions are known as catalytic growth agents for the oxygen reduction reaction (ORR) in fuel cells, but the design and synthesis of high-performance and low-cost catalysts still remain a significant challenge. Herein, we present a cost-effective approach to dispose of MF solid waste as the precursor for the synthesis of MCFes catalyst with the favorable structure features such as the high specific surface area, abundant active sites and suitable pore structure. The results showed that the MCFe-10/10/2 had specific surface area as high as 780.7 m2?g-1 and high efficient catalytic activity comparable to commercial 5% Pt/C catalyst for the ORR in acid media. Furthermore, the influences in the contents of N through heat-treated at NH3 atmosphere were also investigated in detail. It was found that the catalytic activity was sensitive to N type, particularly the ratio of pyridinic-N to total N atoms. The large N contents did not lead to higher ORR activities ofMCFes and NMCFe-10/10/2. While the pyridinic N content improved the onset potential for ORR. Furthermore, iron carbide nanoparticles were well encapsulated in N-doped graphene-like layers, which determined the limiting current density. This judicious transformation of organic-rich waste not only addresses the disposal issue, but also generates valuable functional carbon materials from the discard. The as-synthesized carbon will certainly have greater economic ramifications by creating value added materials from wastes
Effect of Confidence Shock on an Economy with a Shadow Banking System: Analysis Based on Dynamic Stochastic General Equilibrium Model  [PDF]
He Cong, Yang Chen
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.815203
Abstract: We introduced a financial intermediary system including shadow banks into a New-Keynesian dynamic stochastic general equilibrium framework and analyzed the effect of confidence on the real economy. A model simulation indicated that confidence boosts growth and promotes consumption and investment in the real economy. The effects on the shadow banking system and traditional commercial banking system differed, thereby providing a new perspective for policy-making and economic structure model research.
Apparent diffusion behaviour of intermolecular double-quantum coherence modulated by a distant dipolar field in solution NMR

Shen Gui-Ping,Cai Cong-Bo,Cai Shu-Hui,Chen Zhong,

中国物理 B , 2009,
Abstract: A modified correlated spectroscopy (COSY) revamped with asymmetric Z-gradient echo detection sequence was designed to investigate the influence of diffusion behaviour on intermolecular double-quantum coherence signal attenuation during the pre-acquisition period. Theoretical formulas were deduced and experimental measurements and simulations were performed. It is found that the diffusion behaviour of intermolecular double-quantum coherence in the pre-acquisition period may be different from that of conventional single-quantum coherence, depending on the relative orientation of diffusion weighting gradients to coherence selection gradients. When the orientation of the diffusion weighting gradients is parallel or anti-parallel to the orientation of the coherence selection gradients, the diffusion is modulated by the distant dipolar field. This study is helpful for understanding the signal properties in intermolecular double-quantum coherence magnetic resonance imaging.
Observation of intermolecular double-quantum coherence signal dips in nuclear magnetic resonance

Shen Gui-Ping,Cai Cong-Bo,Cai Shu-Hui,Chen Zhong,

中国物理 B , 2011,
Abstract: The correlated spectroscopy revamped by asymmetric Z-gradient echo detection (CRAZED) sequence is modified to investigate intermolecular double-quantum coherence nuclear magnetic resonance signal dips in highly polarized spin systems. It is found that the occurrence of intermolecular double-quantum coherence signal dips is related to sample geometry, field inhomogeneity and dipolar correlation distance. If the field inhomogeneity is refocused, the signal dip occurs at a fixed position whenever the dipolar correlation distance approaches the sample dimension. However, the position is shifted when the field inhomogeneity exists. Experiments and simulations are performed to validate our theoretic analysis. These signal features may offer a unique way to investigate porous structures and may find applications in biomedicine and material science.
Equation of state for shock compressed xenon in the ionization regime: ab initio study
Cong Wang,Yun-Jun Gu,Qi-Feng Chen,Xian-Tu He,Ping Zhang
Physics , 2010,
Abstract: Quantum molecular dynamic (QMD) simulations have been applied to study the thermophysical properties of liquid xenon under dynamic compressions. The equation of state (EOS) obtained from QMD calculations are corrected according to Saha equation, and contributions from atomic ionization, which are of predominance in determining the EOS at high temperature and pressure, are considered. For the pressures below 160 GPa, the necessity in accounting for the atomic ionization has been demonstrated by the Hugoniot curve, which shows excellent agreement with previous experimental measurements, and three levels of ionization have been proved to be sufficient at this stage.
Embodiment in Social Cognition

WU Qiu-Ping,FENG Cong,CHEN Bin-Bin,

心理科学进展 , 2011,
Abstract: Embodiment theory, a new approach to explore how human-being acquires and represents world knowledge, has been attached much attention and gradually flourished in the fields of cognitive psychology, social cognition and social psychology. The present article reviewed the origin and development of embodiment theory, and mainly focused on applying embodiment paradigms on social cognition, including attitude, social perception and emotion. And we pointed out the possible practical problems in the implementatio...
Finite-size effects in a D-dimensional ideal Fermi gas

Su Guo-Zhen,Ou Cong-Jie,Wang A Qiu-Ping,Chen Jin-Can,

中国物理 B , 2009,
Abstract: By using the Euler--MacLaurin formula, this paper studies the thermodynamic properties of an ideal Fermi gas confined in a d-dimensional rectangular container. The general expressions of the thermodynamic quantities with the finite-size corrections are given explicitly and the effects of the size and shape of the container on the properties of the system are discussed. It is shown that the corrections of the thermodynamic quantities due to the finite-size effects are significant to be considered for the case of strong degeneracy but negligible for the case of weak degeneracy or non-degeneracy. It is important to find that some familiar conclusions under the thermodynamic limit are no longer valid for the finite-size systems and there are some novel characteristics resulting from the finite-size effects, such as the nonextensivity of the system, the anisotropy of the pressure, and so on.

HU Jia-cong,YANG Dan,CHEN Ping,WANG Hui,

高分子学报 , 1990,
Abstract: There are two kinds of methods to measure the crystallinity of polymers by WAXD-the relative method (CCI, ICI) and the absolute method (HWM, CPRM, Ruland-M). The results of various methods in the literature are often different. Results of WAXD also disagree with those of other methods (p, DSC, NMR FT-IR etc.). The present work investigated systematically on the differences between WAXD and DSC, p, the choice of 29 range, the effects of various corrections, the separation of amorphous scattering and the comparison between the relative method and the absolute methods etc. It is concluded that WAXD is better than DSC and p, the absolute methods are better than the relative methods and each absolute method has its advantage and shortage. The key problem still is the separation of amorphous scattering from the total scattering.
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