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Mechanical Properties of Polyimide/Multi-walled Carbon Nanotube Composite Fibers

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Chinese Journal of Polymer Science 2016年第11期34卷 1386-1395页

作者： Zhi-xin Dong Tao Feng Chao Zheng Guo-min Li fang-fang Liu 邱雪鹏 Polymer Composites Engineering Laboratory Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Academy of Space Electronic Information Technology Xi'an 710100China

A series of polyimide（PI）/multi-walled carbon nanotube（MWCNT） composite fibers were prepared by copolymerizing a mixture of monomers and carboxylic-functionalized MWCNTs, followed by dry-jet wet spinning, thermal imidization, and hot-drawing process. The content of the carboxylic groups of MWCNTs significantly increased when treated with mixed acid, whereas their length decreased with treatment time. Both the carboxylic content and length of MWCNTs influenced the mechanical properties of the composite fibers. Fiber added with 0.1 wt% MWCNTs treated for 4 h exhibited the best mechanical properties, i.e., 1.4 GPa tensile strength and 14.30% elongation at break, which were 51% and 32% higher than those of pure PI fibers, respectively. These results indicated that a suitable MWCNT content strengthened and toughened the resultant PI composite fibers, simultaneously. Moreover, raising draw ratio resulted in the increase of tensile strength and tensile modulus of the composite fibers.

关键词： walled nanotube tensile modulus resultant carboxylic length spinning elongation dispersed

Rapid, simple and selective determination of 2,4-dinitrophenol by molecularly imprinted spin column extraction coupled with fluorescence detection

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Chinese Chemical Letters 2014年第11期25卷 1492-1494页

作者： min fang fang Lei Jia Zhou y.ng-Ning Wu Zhi-y.ng Gong Institute of Food Science and Engineering Wuhan Polytechnic University Hubei Collaborative Innovation Center for Processing of Agricultural Products Wuhan Polytechnic University China National Center for Food Safety Risk Assessment

A rapid, simple and selective method based on molecularly imprinted, spin column extraction coupled with fluorescence detection was successfully established for the determination of 2,4-dinitrophenol in serum samples. The 2,4-dinitrophenol imprinted polymers exhibited highly selective recognition for the template molecule and the maximum adsorption capacity was 138.9 mg/g. The results indicated that when water is used as the loading solution, only 2,4-dinitrophenol could be adsorbed on the spin column without the remaining structural analogs（2-nitrophenol, 4-nitrophenol and phenol）. After eluting with acetonitrile/acetic acid（9/1, v/v）, 2,4-dinitrophenol in serum samples could be determined by using the fluorescence spectrometer, based on the fluorescence enhancement of fluorescein by the template molecule. Under the optimal conditions, the spiked recovery ranged from 95.8% to 103.4% and the detection limit was 1 nmol/L. The results confirmed the reliability and practicality of the protocol and revealed a good perspective of this method for biological sample analysis.

关键词： Molecularly imprinted solid phase extraction Indirect fluorescence detection Spin column 2 4-Dinitrophenol

Adenovirus-mediated NDRG2 inhibits the proliferation of human renal cell carcinoma cell line OS-RC-2 in vitro

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Asian Pacific Journal of Tropical Medicine 2014年第11期7卷 873-878页

作者： Sheng Qiang Zhen-fang Du min Huang Zhangjiagang Hospital of Traditional Chinese Medicine

Objective:To investigate the inhibitory effects of adenovirus-mediated NDRG2 on the proliferation of human renal cell carcinoma cell line OS-RC-2 in ***:NDRG2 was harvested by RT-PCR,confirmed by DNA sequencing,and then cloned into the eukaryotic expression vector pIRES2-EGFP,which encodes green fluorescent protein(GFP),to construct p1RES2-EGFP-NDRG2 ***-RC-2 cells with NDRG2 negative expression were transfected with p1RES2-EGFP-NDRG2 *** growth of transfected OS-RC-2 cells was observed under light and fluorescence *** colony-forming cell assays,cell proliferation detection and MTT assays,the growth curves of cells in each group were plotted to investigate the inhibitory effects of adenovirus-mediated NDRG2 on the proliferation of OS-RC-2 *** cycle was determined by flow *** laser scanning microscopy showed that NDRG2 protein was specifically located on subcellular ***:A eukaryotic expression vector p1RES2-EGFP-NDRG2 was successfully *** NDRG2 transfection,the growth of OS-RC-2 cells was *** cytometry showed that cells were arrested in S phase but the peak of cell apoptosis was not present,and confocal laser scanning microscopy showed that NDRG2 protein was located in ***:NDRG2 can significantly inhibit the proliferation of OS-RC-2 cells in vitro and its protein is specifically expressed in the mitochondrion.

关键词： NDRC2 OS-RC-2 Adenovirus Proliferation:Inhibition

New Generalized L-KKM Type Theorems in Topological Spaces with Applications

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Journal of Mathematical Research with Applications 2013年第3期33卷 365-371页

作者： min fang Department of Economic Mathematics South Western University of Finance and Economics

In this paper, some new generalized L-KKM type theorems with finitely open values and with finitely closed values are established without any convexity structure in topological spaces. As applications, some new matching theorem, fixed point theorem and existence the orem of equilibrium problem with lower and upper bounds are also given under some suitable conditions. These theorems presented in this paper unify and generalize some corresponding known results in recent literatures.

关键词： generalized L-KKM mapping finitely closed valued finitely open valued fixed point equilibrium problem.

Semiparametric theory based MIMO model and performance analysis

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The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 36-40页

作者： XU fang-min XU Xiao-dong ZHAng Ping Key Laboratory of Universal Wireless Communications (Beijing University ofPosts and Telecommunications) ministry of Education Wireless TechnologyInnovation Institute Beijing 100876 China

In this article, a new approach for modeling multiinput multi-output （MIMO） systems with unknown nonlinear interference is introduced. The semiparametric theory based MIMO model is established, and Kernel estimation is applied to combat the nonlinear interference. Furthermore, we derive MIMO capacity for these systems and explore the asymptotic properties of the new channel matrix via theoretical analysis. The simulation results show that the semiparametric theory based modeling and kernel estimation are valid to combat this kind of interference.

关键词： MIMO partial linear model kernel estimation,unknown nonlinear interference

Gene Delivery of SOCS3 Protects Mice from Lethal Endotoxic Shock

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Cellular & Molecular Immunology 2005年第5期2卷 373-377页

作者： min fang Hong Dai Guang yu Feili Gong Department of Immunology Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 China These authors contributed equally to this work

Suppressor of cytokine signaling 3 （SOCS3） was reported as a feedback inhibitor of cytokine receptor signaling by inhibiting the JAK-STAT signal transduction pathway. We sought to test the anti-endotoxic septic shock effect of liposome mediated gene delivery of SOCS3 in a lethal endotoxic shock mouse model. BALB/c mice were injected intraperitoneally with 200μg pcDNA3.1-SOCS3 cationic liposomes, while pcDNA3.1-IL-10 and empty vector as positive and negative control respectively. Forty-eight hours after gene delivery, mice were challenged with 4 μg of *** 0127：B8 LPS and 18 mg D-GaIN administered i.p. 90 min later, serum TNF-α level was determined. Survival over the next 48 h was evaluated. Peritoneal macrophages from survival mice were stimulated in vitro with 1 μg/ml LPS for 18 h, and the supernatants were harvested for determination of the amount of TNF-α. We found that gene delivery of SOCS3 significantly increase the mouse survival rate from 27.8 ± 9.6% of control group to 61.1 ± 9.6% （p 〈 0.01）. In comparison with control group （218 ± 13 pg/ml） and sham delivery group （219 ± 22 pg/ml）, gene delivery of SOCS3 reduced the level of serum TNF-α （68 ± 9 pg/ml） significantly （p 〈 0.01）. Furthermore, gene delivery of SOCS3 displayed the capacity of prevention of tolerance of peritoneal macrophages to LPS. These findings suggest that gene delivery of SOCS3 mediated by liposome is a promising approach for endotoxic septic shock treatment. Cellular ＆ Molecular Immunology.

关键词： gene delivery SOCS3 endotoxic septic shock

Essence of Pseudogap and Oscillation in High-Temperature Cuprate Superconductor Junction of Pseudogap State

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Communications in Theoretical Physics 2007年第2期47卷 343-348页

作者： LIU Fu-Sui HOU yu-min CHEN Wan-fang Department of Physics Beijing University Beijing 100871 China CCAST （World Lab.） P.O. Box 8730 Beijing 100080 China Graduate Schools the Chinese Academy of Sciences Beijing 100049 China

This paper gives methods to calculate the pairing temperature T＊, at which a pseudogap is opened, and the superconducting temperature Tc, at which superconductivity appears, in the high-Te cuprates, and demonstrates directly that at Tc 〈 T 〈 T＊ the pseudogap is the gap of Cooper pair without long-range phase coherence, and at T 〈 Tc there is long-range phase coherence between Cooper pairs. Based on the above clear physical picture on the pseudogap state and our mechanism for the ac Josephson effect, this paper proposes that there should he a novel oscillatory current in P-I-P junction, induced by a constant bias on the junction. Here, P represents the high-Tc curates in the pseudogap state, where Cooper pairs do not have long-range phase coherence, and I represents the thin insulating barrier. This paper conjectures that there is a possible high-temperature superconductivity in the heavily underdoped high-Tc cuprates.

关键词： pseudogap high-Tc cuprate oscillation

A Survey of Statistical Relationships between Tropical Cyclone Genesis and Convectively Coupled Equatorial Rossby Waves

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Advances in Atmospheric Sciences 2022年第5期39卷 747-762页

作者： Shuguang WAng Juan fang Xiaodong TAng Zhe-min TAN Key Laboratory of Mesoscale Severe Weather(MOE) School of Atmospheric SciencesNanjing UniversityNanjing 210093China

Convectively coupled equatorial Rossby waves(ERW)modulate tropical cyclone activities over tropical *** study presents a survey of the statistical relationship between intraseasonal ERWs and tropical cyclone genesis(TCG)over major global TC basins using four-decade-long outgoing longwave radiation(OLR)and TC best-track *** ERWs are identified from the OLR anomalies using an empirical orthogonal function(EOF)analysis method without imposing equatorial *** find that westward-propagating ERWs are most significant in four tropical ocean basins over the summer hemisphere and that ERWs exhibit similar northeast-southwest(southeast-northwest)tilted phase lines in the northern(southern)hemisphere,with an appreciable poleward advance of wave energy in most TC *** EOF-based ERW indices quantitatively show that ERWs significantly modulate TC *** convectively active(suppressed)phases of ERWs coincide with increased(reduced)TCG *** TCG modulation by ERWs achieves the maximum where the ERWs propagate through the climatological TCG *** a result,the total number of TCG occurrences in the TC basins varies significantly according to the ERW *** ERW-TCG relationship is significant over the northwestern Pacific Ocean,northeastern Pacific Ocean,and the northern Indian Ocean during the northern summer *** the southern summer season,the ERW-TCG relationship is significant over the southern Indian Ocean,Indonesian-Australia basin,and the southwestern Pacific ***,ERW activities are weak in the main TC development region of the Atlantic Ocean;and the impact on Atlantic TCG appears to be insignificant.

关键词： tropical cyclone genesis equatorial Rossby waves statistical analysis

Jacobian Elliptic Function Method and Solitary Wave Solutions for Hybrid Lattice Equation

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Communications in Theoretical Physics 2006年第6期45卷 1057-1062页

作者： WAng Rui-min DAI Chao-Qing ZHAng Jie-fang College of Jinhua Professional Technology Jinhua 321000 China Institute of Nonlinear Physics Zhejiang Normal University Jinhua 321004 China

In this paper, we have successfully extended the Jacobian elliptic function expansion approach to nonlinear differential-difference equations. The Hybrid lattice equation is chosen to illustrate this approach. As a consequence, twelve families of Jacobian elliptic function solutions with different parameters of the Hybrid lattice equation are obtained. When the modulus m → 1 or O, doubly-periodic solutions degenerate to solitonic solutions and trigonometric function solutions, respectively.

关键词： extended Jacobian elliptic function expansion approach hybrid lattice equation Jacobian elliptic function solutions solitonic solutions trigonometric function solutions