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Chinese Journal of Polymer Science 2021年第8期39卷 1059-1068,I0008页

作者： Si-Ying Xiang Ying-Chun Yao Miao-Miao Lu Ya-jiang huang Mi-Qiu Kong Guang-Xian Li College of polymer science and engineering State key laboratory of polymer materials engineering of ChinaSichuan UniversityChengdu 670065China

The influence of polystyrene particles with different nanoscale roughnesses on the morphology of polyisobutylene/poly-dimethylsiloxane blends was studied under shear flow by using confocal laser scanning *** was found that the surface roughness of particles strongly affected their diffusion and distribution behaviors,thereby determining the size and spatial arrangement of droplets in the *** roughness effect of particles was found to possess a strong dependence on both the blend ratio and the shear *** result suggested that the particle roughness can serve as a new parameter to control the structure-property correlation in particle-filled polymer blends,especially under slow flow.

关键词： Rough particles Immiscible polymer blends Shear flow

Substituent effects on the EPR aN values of symmetrically para-disubstituted diphenyl nitroxides

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Chinese Journal of Chemistry 1994年第6期12卷 516-523页

作者： ZHANG, Yu-huang jiang, Bin ZHOU, Cheng-Ming jiang, Xi-KuiShanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 354 Fenglin Lu Shanghai 200032 China

Nitrogen hyperfine splitting constants (aN values) of seven symmetrically para-disubstituted diphenyl nitroxides (1-Y's) were measured by EPR and used in conjunction with five literature values in our correlation analysis. The correlation of these ON values by single-parameter Eq. 1 and dual-parameter Eq. 2 shows that the application of Eq. 2 does not significantly improve the correlation. But our data can also be interpreted by the proposition that the spin-delocalization effect is not completely nonexistent and that it might have revealed itself through the aN values of two very weakly polar substituents with pronounced spin-stabilizing abilities, i.e., SMe and SiMe3.

关键词： EPR diphenyl nitroxides correlation analysis dual-parameter equation.

Light-absorbing copolymers of polyimides as effi

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Aggregate 2023年第5期4卷 235-241页

作者： Shi-Qin Li Yuan Deng jiang huang PuWang Guoliang Liu He-Lou Xie Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education and Key Laboratory of Advanced Functional Polymer Materials of CollegesUniversities of Hunan Province and College of ChemistryXiangtan UniversityXiangtanChina Departments of Chemistry Chemical Engineeringand Materials Science and EngineeringVirginia TechBlacksburgVirginiaUSA

Polyimide(PI),an important engineering polymer with a rigid chemical structure,readily has excellent chemical stability,heat resistance,and electrical insulation but lacks broadband photothermal ***,we design and synthesize PI copolymers that embrace intrinsic photothermal properties by using two diamine monomers of(Z)-2,3-bis(4-aminophenyl)acrylonitrile(CNDA)and 4,4-diphenyldiamine(NDA)with strong ultraviolet(UV),and near-infrared(NIR)absorption capabilities,*** the molar ratio of the two diamines can modulate UV and NIR light absorption and regulate the intrinsic photothermal properties of *** condensation with pyromellitic dianhydride,the resulting PI-0.5 with a unit molar ratio of CNDA:NDA=1 shows the best photothermal ***-0.5 is used to construct 3D steam generators with vertically dried channels by a freeze-drying *** 3D steam generators show a good water evaporation rate and continuously operate with excellent stability under varying salinity and pH *** synthetic design herein suggests that PI can be molecularly engineered to be intrinsic photothermal materials,expanding the properties and applications of existing PIs.

关键词： molecular engineering photothermal polyimide solar water evaporation

Coalescence Suppression in Flowing Polymer Blends Using Silica Rods with Different Surface Chemistries

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Chinese Journal of Polymer Science 2021年第4期39卷 474-483,I0007页

作者： Si-Ying Xiang Li-Sa-Ya Ye Ya-jiang huang Ya-Dong Lv Mi-Qiu Kong Guang-Xian Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering of ChinaSichuan UniversityChengdu 610065China

Silica rods with homogeneous(hydrophilic or hydrophobic)and amphiphilic surface properties were synthesized and their efficiencies in suppressing the flow-induced droplet coalescence of immiscible polyisobutylene(PIB)/polydimethylsiloxane(PDMS)blends were evaluated via in situ visualization *** flow-induced coalescence behavior of blends was found to strongly depend on the surface nature and concentration of silica rods added as well as the blend *** a trace amount of rods promoted coalescence,all kinds of rods demonstrated a morphology refinement effect at high rod *** compatibilization effects were obtained at high rod concentrations,especially for hydrophilic and amphiphilic *** on confocal laser scanning microscopy results,these phenomena observed were interpreted reasonably in terms of the selective distribution and aggregation of silica rods,which were suggested to be decisive for the stabilization mechanism and efficiency of these rods.

关键词： Immiscible polymer blends Flow Morphology Silica rods Surface chemistry

Crystallization of a Ti-based Bulk Metallic Glass Induced by Electropulsing Treatment

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Journal of Iron and Steel Research International 2016年第1期23卷 69-73页

作者： Yong-jiang huang Xiang CHENG Hong-bo FAN Shi-song GUAN Zhi-liang NING Jian-fei SUN National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology School of Materials Science and Engineering Harbin Institute of Technology

The effect of electropulsing treatment（EPT）on the microstructure of a Ti-based bulk metallic glass（BMG）has been *** maximum current density applied during EPT can exert a crucial role on tuning the microstructure of the *** the maximum current density is no more than 2 720A/mm^2,the samples retains amorphous nature,whereas,beyond that,crystalline phases precipitate from the glassy *** EPT,the maximum temperature within the samples EPTed at the maximum current densities larger than 2 720A/mm^2 is higher than the crystallization temperature of the BMG,leading to the crystallization event.

关键词： bulk metallic glass electropulsing transmission electron microscopy crystallization microstructure

Early removing gastrointestinal decompression and early oral feeding improve patients' rehabilitation after colorectostomy

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World Journal of Gastroenterology 2006年第15期12卷 2459-2463页

作者： Tong Zhou Xiao-Ting Wu Ye-jiang Zhou Xiong huang Wei Fan Yue-chun Li Department of Gastrointestinal Surgery West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China

AIM： To evaluate the feasibility, safety, and tolerance of early removing gastrointestinal decompression and early oral feeding in the patients undergoing surgery for colorectal carcinoma. METHODS： Three hundred and sixteen patients submitted to operations associated with colorectostorny from January 2004 to September 2005 were randomized to two groups： In experimental group （n = 161）, the nasogastric tube was removed after the operation from 12 to 24 hours and was promised immediately oral feeding; In control group （n = 155）, the nasogastric tube was maintained until the passage of flatus per rectum. Variables assessed included the time to first passage of flatus, the time to first passage of stool, the time elapsed postoperative stay, and postoperative complications such as anastornotic leakage, acute dilation of stomach, wound infection and dehiscense, fever, pulmonary infection and pharyngolaryngitis. RESULTS： The median and average days to the first passage of flatus （3.0±0.9 vs 3.6±1.2, P〈0.001）, the first passage of stool （4.1± 1.1 vs 4.8±1.4 P〈0.001） and the length of postoperative stay （8.4±3.4 vs 9.6±5.0, P〈0.05） were shorter in the experimental group than in the control group. The postoperative complications such as anastomotic leakage （1.24% vs 2.58%）, acute dilation of stomach （1.86% vs 0.06%） and wound complications （2.48% vs 1.94%） were similar in the groups, but fever （3.73% vs 9.68%, P〈0.05）, pulmonary infection （0.62% vs 4.52%, P〈0.05） and pharyngolaryngitis （3.11% vs 23.23%, P〈0.001） were much more in the control group than in the experimental group. CONCLUSION： The present study shows that applicationof gastrointestinal decompression after colorectostomy can not effectively reduce postoperative complications. On the contrary, it may increase the incidence rate of fever, pharyngolaryngitis and pulmonary infection. These strategies of early removing gastrointestinal decompression and early oral feeding in the patients undergoing colorectostomy are

关键词： Gastrointestinal decompression Feeding Colorectostomy

Highly Hydrolysis-Resistant Polyimide Fibers Prepared by Thermal Crosslinking with Inherent Carboxyl Groups

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Chinese Journal of Polymer Science 2024年第2期42卷 247-255,I0010页

作者： Can-Can Zhang Jun-Long Yang Ya-jiang huang Guang-Xian Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering of ChinaSichuan UniversityChengdu610065China

Easy hydrolysis in alkaline environments limits the use of polyimide fibers in environmental protection. The hydrolysis resistance levels of polyimide fibers can be improved by crosslinking of the macromolecular chains. In this work, crosslinked polyimide fibers(CPI fibers) were produced by intrinsic carboxyl decarboxylation for the first time. The thermal stability of the polyimide fibers containing the intrinsic carboxyl groups(PIC fibers) was studied, and the temperature of the decarboxylation-crosslinking reaction was determined to be 450 ℃. The PIC fibers were hotdrawn to initiate thermal crosslinking of the carboxyl groups and molecular chain orientation at high temperature. The CPI fibers had high tensile strengths(0.72-1.46 GPa) and compressive strengths(401-604 MPa). The oriented macromolecules and chemically crosslinked structure improved the tightness of the molecular chains and endowed the CPI fibers with excellent hydrolytic resistance. The CPI-50 fiber did not dissolve in a 0.5 wt% NaOH solution during heating at 90 ℃ for 10 h, and the tensile strength retention reached 87% when treated in 0.5 wt% NaOH solutions at 90 ℃ for 1 h, providing a guarantee for its application in alkaline corrosive environments.

关键词： Polyimide Carboxyl group Crosslinking Hydrolysis-resistance

Solid-phase Microextraction with Benzoxy-calix[6]arene Fiber Coupled to Gas Chromatography for the Analysis of Polycyclic Aromatic Hydrocarbons in Water

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Chemical Research in Chinese Universities 2011年第2期27卷 198-202页

作者： YE Chang-wen ZHANG Xue-na huang jiang-yan LI Xiu-juan PAN Si-yi College of Food Science ＆ Technology Huazhong Agricultural University Wuhan 430070 P. R. China

Headspace solid-phase microextraction（HS-SPME） with sol-gel calix[6]arene-containing fiber followed by gas chromatography with a flame ionization detector was used to examine the composition and distribution of seven polycyclic aromatic hydrocarbons（PAHs） in water. The novel SPME fiber exhibited higher extraction efficiency to PAHs compared with poly（dimethylsiloxane） and other calixarene-containing fibers. Extraction/retention mechanism based on the interactions between calixarenes and PAHs was discussed. Owing to the good selectivity and high extraction capability of this calixarene fiber, low detection limits were obtained in a range of 0.34―6.50 ng/L and the relative standard deviation values were ≤12.3% for all of the analytes. The linear ranges of the proposed method were five orders of magnitude for the tested compounds, with linear correlation coefficients（r） greater than 0.998. The method was applied to the determination of polycyclic aromatic hydrocarbons in nine water sources in Wuhan City, China. Standard addition method was selected for the quantification and the recovery values were in a satisfactory range. Total PAHs concentrations in the nine surface water samples were found to vary between undetectable and 8.840 μg/L with two- and three-ring PAHs predominating.

关键词： Polycyclic aromatic hydrocarbon Solid-phase microextraction Calixarene Gas chromatography Water

Transient Stability Analysis Based on the Sensitivity of Trajectory Length

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Wuhan University Journal of Natural Sciences 2009年第2期14卷 169-173页

作者： jiang Ningqiang huang Chao CAI Weifeng School of Automation Nanjing University of Science and Technology Nanjing 210094 Jiangsu China

The length of the trajectory is proposed as a function for the employment of the sensitivity analysis method in power system transient stability analysis. Its sensitivity to the faultclearing time is about 10 times higher than that of the energy function or the distance function. The integrating time is reduced to less than 3 s while the accuracy is maintained. It can also be used to provide parameter limits. Simulations on the WSCC 4 machine system and the New England system verify the effectiveness of sensitivity of trajectory length in transient stability analysis.

关键词： power system transient stability sensitivity analysis

IMM/MHT FUSING FEATURE INFORMATION IN VISUAL TRACKING

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Journal of Electronics(China) 2009年第6期26卷 765-770页

作者： Li Shuangquan Sun Shuyan jiang Sheng huang Zhipei Wu Jiankang School of Information Science and Engineering Graduate University of Chinese Academy of Sciences Beijing 100190 China

In multi-target tracking,Multiple Hypothesis Tracking (MHT) can effectively solve the data association problem. However,traditional MHT can not make full use of motion information. In this work,we combine MHT with Interactive Multiple Model (IMM) estimator and feature fusion. New algorithm greatly improves the tracking performance due to the fact that IMM estimator provides better estimation and feature information enhances the accuracy of data association. The new algorithm is tested by tracking tropical fish in fish container. Experimental result shows that this algorithm can significantly reduce tracking lost rate and restrain the noises with higher computational effectiveness when compares with traditional MHT.

关键词： Multiple Hypothesis Tracking (MHT) Interacting Multiple Model (IMM) Feature information fusion Data association