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Search Results: 1 - 10 of 58430 matches for " Wu Yao-man "
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Wu Yao-man,Huang Zhi-tang,

高分子学报 , 1981,
Abstract: The chemical change of four resole type phenol-formaldehyde resins in curing process was studied by infra-red spectroscopy. It was shown that the curing process of resoles, at first, proceeded by condensation reaction of methylol groups, and the formation of dimethylene ether linkage was predominant. During further curing process (150-200°) carbonyl group appeared. The formation of carbonyl group was not caused by the ixidation of methylene group, but was a result of splitting of dimethylene ether linkage. The mechanism of suring process of phenolic resole resins was discussed.

Yu Shang-ying,Shi Mei-yuan,Wu Yao-man,Huang Zhi-tang,

高分子学报 , 1980,
Abstract: A kind of thermosetting phenolic resin was prepared by the condensation of linear phenolic resin (Novolak) with formaldehyde. It exhibts higher carbon content lower modulus and similar thermal stability as compared with ordinary thermosetting phenolic resin, and can be used for preparation of composites.

WU Yao-man,YU Shang-ying,SHI Mei-yuan,HUANG Zhi-tang,

高分子学报 , 1986,
Abstract: The ammonia-catalyzed phenolic resins were prepared in different conditions (mole ratio of phenol (P) to formaldehyde (F), amount of ammonia catalyst and reaction temperature). The reaction process, the structure characterization of obtained resins and the curing process of these resins were studied by chemical analysis, 1H NMR, IR, and DTA.It was shown that the consumption of F was not changed with increasing the mole ratio of F to P when the amount of ammonia was identical. It was also shown that the reaction rate and the nitrogen containing compound was increased with increasing the amount of ammonia.The other results were also discussed.

Wang Dong,Wu Yao-man,Li Jia-ze,Zhang Chong-li,Yu Shang-ying,Jin Jian-rong,Huang Zhi-tang,

高分子学报 , 1980,
Abstract: 合成了以乙醇为溶剂,双环2.2.1]庚-5-烯-2,3-二羧酸乙酯、二苯甲酮四酸二乙酯和4,4’-二胺基二苯甲烷为单体的“PMR型”聚酰亚胺树脂。此树脂适用于制备复合材料。300℃恒温热老化实验表明,与玻璃布复合的增强塑料可在 250℃—300℃ 下长期使用。实验证明树脂溶液是单体的酯铵盐溶液,解决了树脂溶液分层的问题。初步研究了酰胺化、酰亚胺化和交联反应的历程。
Robust H-infinity tracking-control for robotic system based on recurrent fuzzy-neural-networks

PENG Jin-zhu,WANG Yao-man,WANG Jie,

控制理论与应用 , 2010,
Abstract: Using recurrent fuzzy-neural-networks(RFNN) to approximate the nonlinear functions in a robotic manipulator system, we develop an adaptive H-infinity controller. The proposed controller can attenuate the effect of external disturbance and reduce the reconstruction-error of the recurrent fuzzy neural network to a prescribed level. Meanwhile, it also ensures all signals in the closed-loop system to be bounded. Simulation experiments of this control strategy are performed; the results show that this control strategy has better tracking-performance than the computed-torque-control method under external disturbances.
CompactFlash Card Interface Design Based on Embedded Systems

YAO Fang-wu,XU Man-jiang,

计算机应用研究 , 2004,
Abstract: The basic structure and technical characteristic about CompactFlash card is introduced,the interface principle of 16-bit CPU with CompactFlash Card and the technique for managing data based on FAT file system for the IBM PC machine,and implementation of HOST reading from or writing to CompactFlash card is described in this paper in detail.
Pathway and Mechanism of pH Dependent Human Hemoglobin Tetramer-Dimer-Monomer Dissociations
Yao-Xiong Huang, Zheng-Jie Wu, Bao-Tian Huang, Man Luo
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0081708
Abstract: Hemoglobin dissociation is of great interest in protein process and clinical medicine as well as in artificial blood research. However, the pathway and mechanisms of pH-dependent human Hb dissociation are not clear, whether Hb would really dissociate into monomers is still a question. Therefore, we have conducted a multi-technique investigation on the structure and function of human Hb versus pH. Here we demonstrate that tetramer hemoglobin can easily dissociate into dimer in abnormal pH and the tetramer → dimer dissociation is reversible if pH returns to normal physiological value. When the environmental pH becomes more acidic (<6.5) or alkaline (>8.0), Hb can further dissociate from dimer to monomer. The proportion of monomers increases while the fraction of dimers decreases as pH declines from 6.2 to 5.4. The dimer → monomer dissociation is accompanied with series changes of protein structure thus it is an irreversible?process. The structural changes in the dissociated Hbs result in some loss of their functions. Both the Hb dimer and monomer cannot adequately carry and release oxygen to the tissues in circulation. These findings provide a comprehensive understanding on the pH-dependent protein transitions of human Hb, give guideline to explain complex protein processes and the means to control protein dissociation or re-association reaction. They are also of practical value in clinical medicine, blood preservation and blood substitute development.
Size distribution of chemical elements and their source apportionment in ambient coarse, fine, and ultrafine particles in Shanghai urban summer atmosphere
Senlin L&#,Rui Zhang,Zhenkun Yao,Fei Yi,Jingjing Ren,Minghong Wu,Man Feng,Qingyue Wang,
Senlin L&#
,Rui Zhang,Zhenkun Yao,Fei Yi,Jingjing Ren,Minghong Wu,Man Feng,Qingyue Wang

环境科学学报(英文版) , 2012,
Abstract: Ambient coarse particles (diameter 1.8-10 μm), fine particles (diameter 0.1-1.8 μm), and ultrafine particles (diameter < 0.1 μm) in the atmosphere of the city of Shanghai were sampled during the summer of 2008 (from Aug 27 to Sep 08). Microscopic characterization of the particles was investigated by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDX). Mass concentrations of Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Rb, Sr, and Pb in the size-resolved particles were quantified by using synchrotron radiation X-ray fluorescence (SRXRF). Source apportionment of the chemical elements was analyzed by means of an enrichment factor method. Our results showed that the average mass concentrations of coarse particles, fine particles and ultrafine particles in the summer air were 9.38 ± 2.18, 8.82 ± 3.52, and 2.02 ± 0.41 μg/m3, respectively. The mass percentage of the fine particles accounted for 51.47% in the total mass of PM10, indicating that fine particles are the major component in the Shanghai ambient particles. SEM/EDX results showed that the coarse particles were dominated by minerals, fine particles by soot aggregates and fly ashes, and ultrafine particles by soot particles and unidentified particles. SRXRF results demonstrated that crustal elements were mainly distributed in the coarse particles, while heavy metals were in higher proportions in the fine particles. Source apportionment revealed that Si, K, Ca, Fe, Mn, Rb, and Sr were from crustal sources, and S, Cl, Cu, Zn, As, Se, Br, and Pb from anthropogenic sources. Levels of P, V, Cr, and Ni in particles might be contributed from multi-sources, and need further investigation.
Combined analysis of mRNA expression of ERCC1, BAG-1, BRCA1, RRM1 and TUBB3 to predict prognosis in patients with non-small cell lung cancer who received adjuvant chemotherapy
Xue-Feng Leng, Ming-Wu Chen, Lei Xian, Lei Dai, Guang-Yao Ma, Man-Hong Li
Journal of Experimental & Clinical Cancer Research , 2012, DOI: 10.1186/1756-9966-31-25
Abstract: Messenger RNA expressions of these genes were examined in 85 tumor tissues and 34 adjacent tissue samples using semi-quantitative RT-PCR. The expressions of these five genes were analyzed in relation to chemotherapy and progression-free survival (PFS) and overall survival (OS). Seventy-four patients were enrolled into chemotherapy.Patients with ERCC1 or BAG-1 negative expression had a significantly longer PFS (P = 0.001 and P = 0.001) and OS (P = 0.001 and P = 0.001) than those with positive expression. Patients with negative ERCC1 and BAG-1 expression benefited more from platinum regimen (P = 0.001 and P = 0.002). Patients with BRCA1 negative expression might have a longer OS (P = 0.052), but not PFS (P = 0.088) than those with BRCA1 positive expression. A significant relationship was observed between the mRNA expression of ERCC1 and BAG-1 (P = 0.042). In multivariate analysis, ERCC1 and BAG-1 were significantly favorable factors for PFS (P = 0.018 and P = 0.017) and OS (P = 0.027 and P = 0.022).ERCC1 and BAG-1 are determinants of survival after surgical treatment of NSCLC, and its mRNA expression in tumor tissues could be used to predict the prognosis of NSCLC treated by platinum.Lung cancer is a common malignant tumor, and was the first ranked cause of cancer death in both males and females [1]. As one of the most prevalent malignant tumors in China, lung cancer has been highlighted with emphasis for cancer prevention and treatment. Recently, the combinations of cytotoxic agents (such as gemcitabine, vinorelbine, and taxane) and platinum become new standard for non-small-cell lung cancer (NSCLC). But the resistance to these drugs causes unsatisfactory of overall survival rate. Therefore, it is very important to understand the molecular markers of resistance to chemotherapeutic drugs.The excision repair cross-complementing 1 (ERCC1) is a DNA damage repair gene that encodes the 5' endonuclease of the NER complex, and is one of the key enzymes of the nucleotide exci
Solution Scheme for Time Synchronization of Current Differential Protection between Digital Substations  [PDF]
Bin Duan, Yao Wu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B089

In digital substations with power transformers, the key to implementation of line differential protection is synchronization of electrical quantities at both two sides. System framework of current differential protection for lines between digital substations is analyzed briefly, as well as the necessity of demand for time synchronization. Principle of time synchronization based on GPS and IEEE1588 PTP (Precision Time Protocol) are introduced. Time synchronization of current differential protection between digital substations based on IEC61850 is discussed. This paper puts forward two solution schemes of time synchronization, analyzes their advantages and disadvantages respectively, and points out that the development direction of time synchronization of differential protection between digital substations is IEEE1588 PTP.

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