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Influence of p-layer on the performance of n-i-p μc-Si:H thin film solar cells

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Science china.Physics,Mechanics & Astronomy) 2010年第11期53卷 2042-2046页

作者： YUAN YuJie 1,2.ZHANG KaiLiang 1,2.WEI Zhen 1,2.& GENG XinHua 3 1 College of Electronics Information Engineering,tianjin university of Technology,tianjin 300384,china.2.tianjin Key Laboratory of Film Electronic and Communication Devices,tianjin university of Technology,tianjin 300384,china.3 Institute of Photo-Electronics Thin Film Devices and Technique,nankai university,tianjin 300071,china 1. College of Electronics Information Engineering Tianjin University of Technology Tianjin 300384 China2. Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin University of Technology Tianjin 300384 China3. Institute of Photo-Electronics Thin Film Devices and Technique Nankai University Tianjin 300071 China

The high pressure radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) process was adopted to prepare the n-i-p microcrystalline silicon solar cells,the influence of p-type layers on the performance of the solar cells was investigated,and the optimum p layer suited to the n-i-p microcrystalline silicon solar cells was *** experimental results demonstrate that the performance of the solar cells can be highly affected by the structural and optical properties of the p-layers,and the performance of solar cells can be greatly improved by optimizing p *** have achieved an initial active-area efficiency of 8.17% (V oc =0.49 V,J sc =2..9 mA/cm 2.,FF=67%) for the μc-Si:H single-junction n-i-p solar cells and an initial active-area efficiency of 10.93% (V oc =1.31 V,J sc =13.09 mA/cm 2.,FF=64%) for the a-Si:H/μc-Si:H tandem n-i-p solar cells.

关键词： microcrystalline silicon solar cells quantum confinement effect p-type layers

Structure and magnetic properties of a novel heterospin 1-D chain complex containing both Cu(Ⅱ) and nitroxide radicals as spin branches

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Science china.Chemistry 2009年第9期52卷 1438-1443页

作者： MA Yue, CHEN XiaoPing, CAO Dong, YAN ShiPing & LIAO DaiZheng Department of Chemistry, nankai university, tianjin 300071, {2. Department of Chemistry Nankai University Tianjin 300071 China

A novel heterospin one-dimensional (1-D) chain complex containing both Cu(Ⅱ) and nitroxide radical ligands, {[Cu(tcph)(H2.)4][Cu(tcph)(NIT3Py)2.·2.2.}n (1) (H2.cph = tetrachloro-phthalic acid, NIT3Py = 2.(3′-pyridyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide), has been synthesized and structurally characterized. The structure consists of neutral chains of copper(Ⅱ) ions bridged by tcph and coordinated alternatively by nitroxide radicals as spin branches and solvated water as co-ligand. The magnetic data were fitted using an approximate theoretical model based on population analysis to obtain the coupling parameter values of JCu2.Rad = 2..4 cm-1 and J′Cu1-Cu2.= -2.4 cm-1, indicating the intramolecular ferromagnetic interaction between Cu(Ⅱ) and NIT3Py and weak antiferromagnetic interaction between Cu1 and Cu2.linked by tcph.

关键词： nitronyl nitroxide radical Cu(Ⅱ) complex tetrachloro-phthalic acid crystal structure magnetic properties

Constructive proof of deficiency theorem of (g,f)-factor

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Science china.mathematics 2010年第6期53卷 1657-1662页

作者： LU HongLiang1,& YU QingLin2.1Center for Combinatorics,LPMC,nankai university,tianjin 300071,{2.2.epartment of mathematics and Statistics,Thompson Rivers university,Kamloops V2.5N3,Canada 1. Center for Combinatorics LPMC Nankai University Tianjin 300071 China2. Department of Mathematics and Statistics Thompson Rivers University Kamloops V2C5N3 Canada

Berge(1958) gave a formula for computing the deficiency of maximum matchings of a *** generally,Lov'asz obtained a deficiency formula of(g,f)-optimal graphs and consequently a criterion for the existence of(g,f)-***,Lov'asz proved that there is one of these decompositions which is "canonical" in a *** this paper,we present a short constructive proof for the defficiency formula of(g,f)-optimal graphs,and the proof implies an efficient algorithm of time complexity O(g(V)|E|) for computing the ***,this proof implies this canonical decomposition via efficient algorithms(i.e.,in polynomial time).

关键词： deficiency factor alternating trail

Molecular Design of Crown Ethers. 19~1. Synthesis of Novel Disulfide and Diselenide-Bridged Bis (benzo-12.crown-4)s and their Ag^+ Selective Electrode Properties

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Chinese Chemical Letters 2000年第2期11卷 115-118页

作者： Heng Yi ZHANG Yu LIU (Department of Chemistry, nankai university, tianjin 300071) Department of Chemistry Nankai University Tianjin 300071 China

Two novel heteroatom-bridged his (benzo-12.crown-4 ether)s, i.e. his [2.nitro-4,5 (1,4,7,10-tetraoxadecamethylene) disulfide 1 and diselenide 2. have been synthesized. X ray crystallographic structure was obtained for 1. Ion selective electrodes (ISE) for Ag+, containing 1 and 2.in PVC membrane as neutral carriers, were prepared, and their selectivity coefficients for Ag^+ (K_(Ag.M)^(pot)) were determined against other heavy metal ions, alkali and alkaline-earth metal ions. and ammonium ion. These ISEs showed excellent Ag^+ selectivities, log K_(Ag.M)^(pot) ≤ -3.8, against most of the interfering canons examined, except for Hg^+.

关键词： Heteroatom-bridged his (benzo-12.crown-4 ether)s ion selective electrodes selectivity coefficients.

Electrochemiluminescence from tris(2.2.-bipyridyl) ruthenium (Ⅱ) in the presence of aminocarboxylic acid co-reactants

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Science china.Chemistry 2009年第9期52卷 1394-1401页

作者： YIN XueBo, SHA BeiBei & HE XiWen Research Centre for Analytical Sciences, College of Chemistry, nankai university, tianjin 300071, {2. Research Centre for Analytical Sciences College of Chemistry Nankai University Tianjin China

Due to the highly sensitive electrochemiluminescence (ECL), tris(2.2.-bipyridyl) ruthenium(II) (Ru(bpy)32.) is often used in the field of bioarrays with the help of co-reactants. However, the generally used co-reactant, tripropylamine (TPA), is toxic, corrosive and volatile. Therefore, the search for safe, sensitive and economical co-reactants is critical. Herein, three aminocarboxylic acids, ethylenediamine-tetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and 2.hydroxyethylethylene diaminetriacetic acid (HEDTA), have been investigated as potential co-reactants for promoting Ru(bpy)32. ECL behaviour. A possible ECL mechanism is also presented. The experimental results suggested that the co-reactants have a different ECL behaviour compared to TPA, such as different pH- and surfactant-responses. The detection limits of Ru(bpy)32. using NTA, EDTA and HEDTA as co-reactants are 1, 60 and 680 fmol·L-1, respectively. The results indicate that NTA has a much higher efficiency than TPA to excite Ru(bpy)3 2. ECL under their own optimal conditions. NTA could be widely used in many fields because it is less toxic, corrosive and volatile than TPA. Moreover, using Ru(bpy)3 2. ECL, a sensitive method for the detection of aminocarboxylic acids is also developed. An improvement of four orders of magnitude in detection limits is obtained for EDTA compared to the known Ru(bpy) 3 2. chemiluminescent methods.

关键词： Ru(bpy)32. electrochemiluminescence co-reactants aminocarboxylic acids

On a Boolean-valued Model of the Strict Implication System(Continuous)

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Chinese Quarterly Journal of mathematics 2004年第4期19卷 346-349页

作者： LI Na, LIU Hua-ke(1.Department of Philosophy, nankai university, tianjin 300071,{2.2. College of mathematics and Information Science, Henan university, Kaifeng 475001,{2. Department of Philosophy Nankai UniversityTianjin 300071 China College of mathematics and Information Science Henan University Kaifeng 475001China

The reference [4] proved the consistency of S1 and S2.among Lewis' five strict implication systems in the modal logic by using the method of the Boolean-valued model. But, in this method, the consistency of S3, S4 and S5 in Lewis' five strict implication systems is not decided. This paper makes use of the properties: (1) the equivalence of the modal systems S3 and P3, S4 and P4; (2. the modal systems P3 and P4 all contained the modal axiom T(□p → p); (3) the modal axiom T is correspondence to the reflexive property in VB. Hence, the paper proves: (a) ‖As31‖ = 1; (b) ‖AS41‖ = 1; (c) ‖AS5l‖ = 1 in the model(where B is a complete Boolean algebra, R is reflexive property in VB). Therefore, the paper finally proves that the Boolean-valued model VB of the ZFC axiom system in set theory is also a Boolean-valued model of Lewis' the strict implication system S3, S4 and S5.

关键词： the strict implication system Boolean-valued model Boolean value

Influence of Four Factors on Discharge Capacity and Self-Discharge Rate of Iron Electrode

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Journal of Materials Science & Technology 2003年第6期19卷 515-517页

作者： Dongfeng LIN, Shihai YE, Rong CAI, Deying SONG and Panwen SHENInstitute of New Energy Material Chemistry, nankai university, tianjin 300071, {2. Inst. of New Energy Mat. Chem. Nankai Univ. Tianjin 300071 China

Ni-Fe rechargeable batteries possess the advantages of long cycle life, high theoretical specific energy, abundant raw material, low price and environmental friendship. It has a wide applied perspective. The advantages, disadvantages and preparation methods of iron electrodes were summarized. The influence of four factors on discharge capacity and self-discharge rate of iron electrode were discussed by means of orthogonal experiments, galvanostatic charges and discharges. The influences of graphite on the discharge capacity and self-discharge rate of iron electrode were the most remarkable, the most unapparent influences on the discharge capacity and self-discharge rate were HPMC (hydroxy propoxy methoxy cellulose) and sodium sulphide, respectively. The aim of the present research was to study the effects of graphite, HPMC and iron powder added in the electrodes, sodium sulphide added in the electrolytes on the discharge capacity and self-discharge rate of iron electrodes. The largest discharge capacity of the iron electrodes was 488.5 mAh/g-Fe at 66.4 mA/g-Fe in the first ten cycles, and the average self-discharge rate was 0.367% per hour.

关键词： Iron electrode Discharge capacity Self-discharge rate Ni-Fe battery

Dynamic spreading behavior of homogeneous and heterogeneous networks

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Progress in Natural Science:Materials International 2007年第3期17卷 358-365页

作者： XIA Chengyi, LIU Zhongxin, CHEN Zengqiang and YUAN Zhuzhi ( Department of Automation, nankai university, tianjin 300071,{2.Department of Computer Science and Engineering, Tian-jin university of Technology, tianjin 300191,{2. [a]Department of Automation Nankai University Tianjin China [b]Department of Computer Science and Engineering Tianjin University of Technology Tianjin China

The detailed investigation of the dynamic epidemic spreading on homogeneous and heterogeneous networks was carried out. After the analysis of the basic epidemic models, the susceptible-infected-susceptible (SIS) model on homogenous and heterogeneous networks is established, and the dynamical evolution of the density of the infected individuals in these two different kinds of networks is analyzed theoretically. It indicates that heterogeneous networks are easier to propagate for the epidemics and the leading spreading behavior is dictated by the exponential increasing in the initial outbreaks. Large-scale simulations display that the infection is much faster on heterogeneous networks than that on homogeneous ones. It means that the network topology can have a significant effect on the epidemics taking place on complex networks. Some containment strategies of epidemic outbreaks are presented according to the theoretical analyses and numerical simulations.

关键词： complex networks dynamic epidemic spreading SIS model homogeneous networks heterogeneous networks containment strategies.

Shape description matrix and its applications to color-image retrieval and recognition

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Science china.Technological Sciences) 2004年第2期47卷 159-165页

作者： WANG Yi,ZHAI Hongchen,LIANG Yanmei,ZHANG Siyuan & MU Guoguang Institute of Modern Optics,nankai university,tianjin 300071,{2.Key Laboratory of Information Sci-ence and Technology MOE,tianjin 300071,china 1. Institute of Modern Optics Nankai University 300071 Tianjin China 2. Key Laboratory of Information Science and Technology MOE 300071 Tianjin China

Shape description matrix (SDM) describing regional pixel distribution characteristics of images is defined, with both radial and angular distribution messages taken into account to offer a comprehensive and exact description of the shape characteristics even upon a blurred edge. Using this SDM, a general color histogram (GCH) is developed. Both theoretical and experimental results show that the GCH can be applied to color-image retrievals and recognitions with a high efficiency.

关键词： SDM, similarity degree, match degree, general color histogram.