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Optoelectronic properties of fluorene-co-4,7-difuran-2,1,3-benzothiadiazole copolymers

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Science China Chemistry 2010年第3期53卷 575-579页

作者： Luo Jie yang RenQiang yang wei Cao Yong S China Univ Technol Inst Polymer Optoelect Mat & Devices Guangzhou 510640 Peoples R China Guangdong Univ Technol Expt Teaching Ctr Guangzhou 510006 Peoples R China Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Qingdao 266101 Peoples R China

Light-emitting and photovoltaic properties of copolymers(PFO-FBT) based on 9,9-dioctylfluorene and 4,7-difuran-2,1,3-benzothiadiazole(FBT) units were *** copolymers show two absorbance peaks at around 382 nm and 530 nm,*** relative absorbance at around 530 nm of the PFO-FBT copolymers increases with the increasing FBT *** EL emissions are red-shifted from 611 nm to 702 nm by increasing the FBT content in the *** highest EL external quantum efficiency achieved with the device configuration of ITO/PEDOT/PVK/PFO-FBT0.1/Ba/Al is 2.32% with the luminance of 441.3 cd/m2 at a current density of 33 mA/*** energy transfer due to exciton trapping on low band-gap FBT sites was *** bulk-heterojunction photovoltaic cell used PFO-FBT50 copolymer as the electron donor and methanofullerene [6,6]-phenyl C61-butyric acid methyl ester(PCBM) as the electron acceptor shows an energy conversion efficiency of 1.13% with open-circuit voltage(Voc) of 0.85 V and short-circuit current density(Jsc) of 3.39 mA/cm2 under AM 1.5 solar simulator(100 mW/cm2),and the edge of the spectral photoresponse is at ～750 nm.

关键词： fluorene-co-furan-benzothiadiazole copolymer photoluminescence photovoltaic cell

An Optimized Cross Correlation Power Attack of Message Blinding Exponentiation Algorithms

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China Communications 2015年第6期12卷 22-32页

作者： WAN Wunan yang wei CHEN Jun Information Security Engineering College Chengdu University of Information Technology Institute of Applied Cryptography Chengdu University of Information Technology

The message blinding method is the most efficient and secure countermeasure against first-order differential power analysis(DPA).Although cross correlation attacks(CCAs) were given for defeating message blinding methods,however searching for correlation points is difficult for noise,misalignment in practical *** this paper,we propose an optimized cross correlation power attack for message blinding exponentiation *** attack method can select the more correlative power points of share one operation in the modular multiplication by comparing variances between correlation *** we demonstrate that the attack method is more efficient in experiments with hardware implementation of RSA on a crypto chip *** addition to the proposed CCA method can recovery all 1024 bits secret key and recognition rate increases to 100%even when the recorded signals are noisy.

关键词： side channel attack correlationpower analysis cross correlation attacks module exponentiation.

Emerging role of ER quality control in plant cell signal perception

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Protein & Cell 2012年第1期3卷 10-16页

作者： Hong-Ju Li wei-Cai yang State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China

The endoplasmic reticulum quality control(ER-QC)is a conserved mechanism in surveillance of secreted signaling factors during cell-to-cell communication in *** data show that the ER-QC plays important roles in diverse cell-to-cell signaling processes during immune response,vegetative and reproductive development in *** tube guidance is a precisely guided cell-cell communication process between the male and female gametophytes during plant ***,the female signal has been identified as small secreted peptides,but how the pollen tube responds to this signal is still *** this review,we intend to summarize the role of ER-QC in plants and discuss the recent advances regarding our understanding of the mechanism of pollen tube response to the female signals.

关键词： cell-to-cell communication pollen tube guidance gametophyte ER quality control

Shift in the percolation threshold of compressed composites—A 3D Monte Carlo simulation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 822-826页

作者： Chuan LIN Hong-tao WANG wei yang Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing 100084 China Institute of Applied Mechanics Zhejiang University Hangzhou 310027 China

The shift in the percolation threshold of compressed composites was studied by a 3D continuum percolation model. A Monte Carlo (MC) method was employed in the simulations. The percolation threshold was found to rise with the compression strain, which captures the basic trend in compression-induced conductivity variation from the experiments. Both fiber bending and texture formation contribute to the percolation threshold. The results suggest that fillers with a high aspect ratio are more desirable for sensor and electrical switch applications.

关键词： Monte Carlo (MC) model Percolation threshold Compressed composites

Synthesis of Inorganic Silica Grafted Three-arm PLLA and Their Behaviors for PLA Matrix

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Chinese Journal of Polymer Science 2019年第3期37卷 216-226页

作者： Da-wei Shi Xiang-Ling Lai Yuan-Ping Jiang Cong Yan Zheng-Ying Liu wei yang Ming-Bo yang State Key Laboratory of Polymer Materials Engineering College of Polymer Science and Engineering Sichuan University

The low melt strength and poor crystallization behavior severely limit the processing and application of poly(lactic acid)(PLA) as biodegradable film materials. In this work, three-arm poly(L-lactic acid)(3A-PLLA) grafted silica nanoparticles with two kinds of topology structures were introduced into PLA matrix to improve the biodegradation performance. Different methods were used to characterize the structure of the grafted 3A-PLLA chains, the grafting density, and the thermal decomposition behavior of the nanoparticles. By varying the mass ratios of raw materials and altering the order of dropping solution in the reaction, high grafting densitytangled 3A-PLLA grafted SiO_2 was synthesized as "3A-PLLA grafting to SiO_2"(GTS), while low grafting density-stretched 3A-PLLA grafted SiO_2 was obtained as "SiO_2 grafting to 3A-PLLA"(GTA). Topology of nanoparticles as well as the filler-matrix interaction is critically important to structure bio-nanocomposites with desirable properties. Thus, the GTS and GTA nanoparticles were introduced into PLA matrix to assess the effect. The SEM images showed the uniform dispersion of the modified nanoparticles, while the shear rheology results revealed that GTA nanoparticles made a more significant contribution on the melt-strengthening and relaxation time-extension of PLA. Moreover, it is suggested that GTA nanoparticles were more effective to act as a nucleating agent for PLA, which was proved by differential scanning calorimetry(DSC) and polarized optical microscopy(POM) researches. All of the improvements mentioned above of GTA nanocomposites can be ascribed to stronger entanglements between 3A-PLLA stretched by nano-SiO_2 and PLA matrix.

关键词： Poly(lactic acid) Nanocomposites Surface grafting Topology Crystallization

Positive Solutions to a Neumann Problem of Semilinear Elliptic System with Critical Nonlinearity

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Acta Mathematicae Applicatae Sinica 2006年第4期22卷 687-702页

作者： wei-hua yang Academy of Mathematics and Systems Science Chinese Academy of Science Beijing 100080 China

In this paper, we consider the Neumann boundary value problem for a system of two elliptic equations involving the critical Sobolev exponents. By means of blowing-up method, we obtain behavior of positives with low en... 详细信息

关键词： Elliptic system Neumann problem critical Sobolev exponent

Experimental investigation of aerodynamics of turbine blade trailing edge cooling

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航空动力学报 2010年第5期25卷 1097-1102页

作者： SUN Da-wei QIAO wei-yang DONG Kang-tian XU Kai-fu School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Xi'an Thermal Power Research Institute Xi'an 710032China

This paper presented an experimental investigation the effects of the trailing edge cooling on the aerodynamic performance. The experiments were conducted on the low-speed linear cascade tunnel at Northwestern Polytechnical University. The external aerodynamic characteristics in the 40 percent chord downstream of exit plane were measured using five-hole probe with the different ejection rates. The results showed that the total pressure loss coefficient at the middle spanwise plane increased at first and then it has a decreasing tendency with the increase of ejection ratio. The trailing edge cooling would influence the structure of the turbine cascade outlet flow field. When the ejection rate was 3%,the loss area near the blade endwall would become stronger,but it would become weaker with the 6% ejection ratio. On the whole,the trailing edge cooling had more influence on the profile loss than on the secondary loss.

关键词： turbine blade trailing edge cooling profile loss secondary loss

Hydrothermal Synthesis and Crystal Structure of a Novel Composite Keggin-type Arsenotungstate: [Ni(phen)_2][Hphen](AsW_(12)O_(40))

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Chinese Journal of Structural Chemistry 2007年第2期26卷 194-198页

作者： WANG Jing-Ping WANG wei NIUJing-yang Institute of Molecular and Crystal Engineering School of Chemistryand Chemical Engineering Henan University Kaifeng 475001 China

A novel polyoxometalate-based composite compound [Ni（phen）2][Hphen]（AsW12040）（phen = 1,10-phenanthroline） I has been hydrothermally synthesized and characterized by elemental analysis, IR, TGA, ESR spectroscopy and single-crystal X-ray diffraction. Each structure unit of 1 consists of one polyoxoanion AsW12O40^3-, one free phenanthroline molecule and one coordination cation [Ni（phen）2]^2＋. The title compound crystallizes in the orthorhombic system, space group F212121, with a = 12.2383（7）, b = 21.0884（11）, c = 22.3237（12） A, V= 5761.4（5） A^3, Mr = 3520.44, Z = 4, Dc = 4.059 g/cm^3, F（000） = 6204, g（MoKα） = 24.844 mm^-1, GOF = 1.022, the final R = 0.0376 and wR = 0.0742 （I 〉 2σ（I）） for 865 parameters and 9637 observed reflections with I 〉 2σ（I）.

关键词： polyoxotungstate hydrothermal synthesis Keggin structure ESR

Adsorption and correlation with their thermodynamic properties of triazine herbicides on soils

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Journal of Environmental Sciences 2003年第4期15卷 443-448页

作者： yang wei chun LIU wei ping LIU Hui jun LIU Guang shen Institute of Environmental Science Zhejiang UniversityHangzhou 310027China.

Adsorption of atrazine, prometryne and prometon was determined on six soils with different physical and chemical properties. The adsorption isotherms of three herbicides could well fit Freundlich equation. On all of s... 详细信息

关键词： triazine herbicide soil adsorption excess thermodynamic properties