Tue Oct 11 16: 48: 55 cst 2005




Скачать 108.24 Kb.
НазваниеTue Oct 11 16: 48: 55 cst 2005
страница1/4
Дата09.10.2012
Размер108.24 Kb.
ТипДокументы
  1   2   3   4
(csa.lib.tsinghua.edu.cn)
Tue Oct 11 16:48:55 CST 2005
CSA
Database: METADEX
Query: nano materials

Record 1 of 64

DN: Database Name
    Recent References Related to Technology
TI: Title
    Smart (Nano) materials: TiO2 nanostructured films to modify electrodes
    for assembling of new electrochemical probes
SO: Source
    Sensors and Actuators B, vol. 111-112, pp. 441-449, 11 Nov. 2005
DE: Descriptors
    Nanostructure; Titanium dioxide; Nanocomposites; Electrodes;
    Nanomaterials; Generation; Chemical sensors; Actuators; Biosensors;
    Surface area; Optical; Nanostructured materials; Ascorbic acid;
    Functions; Stables; Guanines; Electron transfer; Oxides; Assembling;
    Sensors
AB: Abstract
    Smart (Nano) materials with biosensing functions posses enormous
    potential in the development of new generation stable biosensors,
    chemical sensors, and actuators. Recently, there is a considerable
    interest in using TiO2 nanostructured materials as a film-forming
    material since they have high surface area, optical transparency, high
    bio-compatibility, and relatively good conductivity. In this work,
    TiO2 oxides were used as nanoporous electrodes to study the electron
    transfer mechanisms of H2O2, and many interesting biological
    molecules, as 3,4-dihydroxyphenylacetic acid (DOPAC), ascorbic acid,
    guanine, l-tyrosine, acetaminophen, and D*b-NADH, in order to assemble
    a new generation of chemical sensors and biosensors. A kinetic study
    was also reported in this paper, which demonstrated high performances
    towards electrocatalytic processes, obtained at nanostructured
    TiO2-modified electrodes.

Record 2 of 64

DN: Database Name
    Recent References Related to Technology
TI: Title
    Measurement of Continuous Micro-Tensile Strain Using Micro-ESPI
    Technique
SO: Source
    Key Engineering Materials, vol. 297-300, pp. 53-58, Nov. 2005
DE: Descriptors
    Microelectromechanical systems; Algorithms; Nanostructure; Silicon
    substrates; Thin films; Stress strain curves; Strain measurement;
    Titanium nitride; Mathematical models; Gold
AB: Abstract
    To determine the micro-mechanical properties for micro/nano materials,
    it may be essential to measure the strain/deformation during
    micro-mechanical testing. Therefore, in this study, continuous
    measurement of in-plane tensile strain in micro-sized specimens of
    thin film materials was introduced using the micro-ESPI technique. TiN
    and Au thin films 1 and 0.47mm thick, respectively, were deposited on
    the silicon wafer and fabricated into the micro-sized tensile
    specimens by the electromachining process. The micro-tensile loading
    system and micro-ESPI system were developed to measure the tensile
    strain during micro-tensile loading. Micro-tensile stress-strain
    curves for these materials were determined using the algorithm for
    continuous strain measurement. Furthermore, the new algorithm for
    enhancing the sensitivity to measurement of in-plane tensile strain
    was suggested. Using the algorithm, micro-tensile strain data between
    interfringes were calculated. It is shown that the algorithm for
    enhancement of the sensitivity suggested in this study makes the
    sensitivity to the in-plane tensile strain increase. (Application:
    microelectromechanical systems.)

Record 3 of 64

DN: Database Name
    Recent References Related to Technology
TI: Title
    Repairing Surface Defects of Steel 304 with Nano-Silica
SO: Source
    Huadong Ligong Daxue Xuebao (Ziran Kexue Ban)/Journal of East China
    University of Science and Technology (Natural Science Edition), vol.
    31, pp. 253-255, Apr. 2005
DE: Descriptors
    Austenitic stainless steels; Repairing; Surface defects;
    Nanomaterials; Tensile properties; Fluidizing; Selectivity;
    Morphology; Silicon dioxide
AB: Abstract
    A new method for repairing surface defects with nano-materials was
    suggested. Reparing surface defects of steel 304 with nano-silicas was
    studied. The effects of the process conditions of repairing with
    fluidizing nano-silicas on the surface morphology (the selectivity of
    repair) and tensile properties of test steel pieces were investigated.
    The facts show that nano-materials can repair surface defects
    selectively. A new technique for repairing surface defects may be
    developed.

Record 4 of 64

DN: Database Name
    Recent References Related to Technology
TI: Title
    Improvement of preservation of iron relics with polyurethane emulsion
    by adding assistant
SO: Source
    Journal of Beijing University of Chemical Technology (Natural Science
    Edition), vol. 32, pp. 47-49, 54, Apr. 2005
DE: Descriptors
    Protective coatings; Iron; Polyurethane resins; Emulsions; Inhibition;
    Corrosion resistance; Titanium dioxide; Corrosion inhibitors; Silicon
    dioxide; Preservation; Ultraviolet radiation
AB: Abstract
    A new composite protective technique for iron relics was made up of
    bottom and top coats. Polyurethane emulsion added corrosion inhibitors
    was used as the bottom coat and the nanoparticles of TiO2 and SiO2
    were dispersed in the polyurethane emulsion to form the top coat. The
    properties were assessed by Transmission Electron Microscope (TEM),
    Scanning Electron Microscope (SEM) and Ultraviolet Spectroscopy, etc.
    The results show that the bottom coat by adding corrosion inhibitors
    and the top coat by adding nano-materials have excellent ultraviolet
    resistance and corrosion resistance and result in a good protection of
    iron relics.

Record 5 of 64

DN: Database Name
    METADEX
TI: Title
    Crystal structure transformation and luminescent behavior of the red
    phosphor for plasma display panels
AU: Author
    Yu, Zhijian; Huang, Xiaowei; Zhuang, Weidong; Cui, Xiangzhong; Li,
    Hongwei
SO: Source
    Journal of Alloys and Compounds. Vol. 390, no. 1-2, pp. 220-222. 22
    Mar. 2005
DE: Descriptors
    Phosphors; Crystal structure; Transition; X ray diffraction; Oxides
AB: Abstract
    To improve the chroma of red phosphor for plasma display panels, Eu3+
    activated phosphors were prepared by combustion method, and were
    investigated in detail by XRD and PL spectra. With the decreasing of
    the amount of H3BO3, the phosphor crystal structures transform from
    hexagonal ortho-borate to monoclinic RE3BO6, and then to cubic oxide.
    The dominating emissions of the phosphors also change from 5D0-7F1
    transition to 5D07F1 transition. Accordingly, CIE coordinates of the
    phosphors show that x values are increasing while y values are
    decreasing. Thus, phosphor with higher color purity could be achieved
    by adjusting the mole ratio of H3BO3.

Record 6 of 64

DN: Database Name
    METADEX
TI: Title
    Mineralization By The Peptide Aptamer Against Ti
AU: Author
    Sano, Ken-Ichi; Sasaki, Hiroyuki; Shiba, Kiyotaka
SO: Source
    Polymer Preprints. Vol. 46, no. 1. Mar. 2005
DE: Descriptors
    Peptides; Titanium; Surface properties; Interface reactions;
    Bioengineering
AB: Abstract
    Controlled interfacing between bio-molecules and inorganic materials
    is fundamental to the development of bio-nano materials. In the past
    several years, peptide aptamers that bind to various inorganic
    materials have been isolated by using evolutional engineering methods
    including peptide phage system. However, little is know about the
    molecular mechanisms how they interact with the surface of materials.
    We have isolated a peptide aptamer, TBP-1. The mutational analyses
    revealed that the electrostatic interaction is the major force to
    associate TBP-I with the surface of Ti.

Record 7 of 64

DN: Database Name
    METADEX
TI: Title
    Selective growth and characterization of nanostructures with
    transmission electron microscopes
AU: Author
    Shimojo, M; Bysakha, S; Mitsuishi, K; Tanaka, M; Song, M; Furuya, K
SO: Source
    Applied Surface Science. Vol. 241, no. 1-2, pp. 56-60. 28 Feb. 2005
DE: Descriptors
    Silicon; Carbon; Rods; Gold; Aluminum; Electron beams; Catalysis;
    Electron microscopes; Chambers; Nanostructure; Nanocomposites;
    Nanomaterials
AB: Abstract
    A new type of electron beam-induced reactions is reported. Focused
    electron beams, the probe size of which is about 0.8 nm, were
    irradiated on carbon and Si substrates with an introduction of an
    aluminum trichloride or a gold trichloride gas in the chamber.
    Nanometer-sized carbon and Si rods were formed using carbon and Si
    substrates, respectively, by moving the beam position at a certain
    speed. As no aluminum, gold or chlorine was found in the rods, it is
    considered that chloride gases behaved as a sort of catalysis.

Record 8 of 64

DN: Database Name
    METADEX
TI: Title
    Synthesis of Cu-based Bulk Metallic Glass Matrix Composites by Warm
    Processing of Gas Atomized Powders
AU: Author
    Lee, J K; Kim, H J; Yamasak, M; Kawamura, Y; Bae, J C
SO: Source
    Materials Science Forum. Vol. 475-479, Part 5, pp. 3419-3422. 2005
DE: Descriptors
    Metallic glasses; Copper base alloys; Brasses; Ductility; Porosity;
    Compressive strength; Plastic deformation; Crystallization; Powder
    metallurgy; Strain; Atomizing; Particulate composites; Spark plasma
    sintering; COPPER GLASS ALLOYS; NICKEL ALLOYS (0 TO 50 NI); ZIRCONIUM
    ALLOYS (0 TO 0.5 ZR); ZIRCONIUM ALLOYS (0.5 TO 50 ZR); TITANIUM ALLOYS
    (0 TO 50 TI); BRASSES
AB: Abstract
    The bulk metallic glass matrix composite comprising Cu54Ni6Zr22Ti18
    metallic glass powder and ductile brass powder was fabricated by the
    warm process. The warm process was carried out by spark plasma
    sintering, which led to the homogeneous distribution of both phases of
    brass and metallic glass without pores. The metallic glass matrix
    composite material exhibits the same crystallization behavior of the
    metallic glass powder. A compressive strength of 1.0 GPa with a
    plastic strain of 3 % was obtained in the present metallic glass
    composite. The composite with enhanced strength and ductility was
    successfully achieved by introducing a ductile phase in the hard bulk
    metallic glass.

Record 9 of 64

DN: Database Name
    METADEX
TI: Title
    Grain Refinement and Mechanical Properties of a Metastable Austenitic
    Fe-Cr-Ni-Mn Alloy
AU: Author
    Ma, Yunqing; Jin, Jae-Eun; Lee, Young-Kook
SO: Source
    Materials Science Forum. Vol. 475-479, Part 1, pp. 43-48. 2005
DE: Descriptors
    Thermomechanical treatment; Annealing; Cold rolling; Hot rolling;
    Austenitic stainless steels; Martensitic transformations; High
    strength; Grain size; Nanostructure; Austenite; Work hardening; Yield
    strength; Alloy development; Grain refinement; Tensile tests
AB: Abstract
    A lot of works for developing the structural nano-materials have been
    performed all over the world in recent years. Severe deformation
    techniques like HPT, ECPA and ARB have been applied to different
    materials such as Al, Cu, Ti and several steels. Such techniques
    greatly reduced the grain size and improved the yield and tensile
    strengths. However, the elongation of the materials is greatly
    decreased due to the small amount of work hardening, and these
    techniques do not seem suitable for the mass production. Therefore,
    this study has been carried out as a fundamental research for
    developing austenitic steels with high strength and good elongation
    using a conventional rolling and annealing processes.
    Fe-0.1%C-10%Cr-5%Ni-8%Mn alloy was melted, homogenized, hot rolled,
    and cold rolled at room temperature to transform gamma austenite to
    alpha' martensite. After that, the specimens were annealed just above
    its reverse transformation finish temperature (Af) to obtain the fine
    reversed austenite grains. The grain size of the metastable austenitic
    steel was successfully refined to less than 200nm by repeating rolling
    and annealing processes. The resultant nanocrystalline material shows
    not only high strength but also large elongation because the work
    hardening ability is enhanced by the strain-induced martensitic
    transformation during the tensile test.

Record 10 of 64

DN: Database Name
    Recent References Related to Technology
TI: Title
    Effect of Ammoniating Temperature of ZnO/Ga2O3 Films on Fabrication of
    GaN Nanosize Materials on Si Substrates
SO: Source
    Xiyou Jinshu Cailiao yu Gongcheng (Rare Metal Materials and
    Engineering), vol. 34, pp. 73-76, Jan. 2005
DE: Descriptors
    Gallium nitrides; Silicon substrates; Nanostructure; Wurtzite; Crystal
    structure; Morphology; Magnetron sputtering; Zinc oxide; Gallium
    oxides; Semiconductors
AB: Abstract
    Hexagonal wurtzite GaN materials with nano-structure have been
    fabricated on Si (111) substrates via ammoniating ZnO/Ga2O3 films at
    different temperatures. ZnO layers and Ga2O3 films were deposited in
    turn on Si (111) substrates by radio frequency (r.f.) magnetron
    sputtering before the ammoniating process. The structure and
    composition of GaN crystal were studied by X-ray diffraction (XRD) and
    fourier transform infrared spectrophotometer(FTIR).The morphology of
    the samples was studied by scanning electron microscopy (SEM). Through
    the analyses of the measurement results, a conclusion can be drawn
    that hexagonal wurtzite GaN with nano structure was grown on Si (111)
    substrates with the assistance of the volatilization of ZnO, and the
    ammoniating temperature has a great effect on the fabrication of GaN
    nano materials with this method.

Record 11 of 64

DN: Database Name
    Recent References Related to Technology
TI: Title
    Mo6S4.5I4.5 nanowires: dispersion studies and electron microscopy
    characterization of the bundles
SO: Source
    Proc. SPIE, vol. SPIE-5824, pp. 102-113
DE: Descriptors
    Nanowires; Nanostructure; Three phase; X-ray photoelectron
    spectroscopy; Raw materials; Experiments; Nanotubes; Electron
    microscopy; Purification; Nanocomposites; Theories; Isopropanol;
    Nanomaterials
AB: Abstract
    The processing of most one-dimensional nano-materials such as carbon-
    nanotubes is hampered by the fact that they are insoluble. Here we
    show how a significant portion of the as-produced Mo6S4.5I4.5
    nanowires is stably dispersed in isopropanol as small diameter
    nanowire bundles. Sedimentation studies, performed combining
    experiments and theory, show the presence of three phases in the raw
    material: impurity material, insoluble and soluble nanowire bundles. A
    purification procedure is also discussed. The three phases has been
    characterized by UV-Vix-IR spectroscopy and XPS showing their
    intrinsic diversity.

Record 12 of 64

DN: Database Name
    METADEX
TI: Title
    Diameter-Controlled Growth of Carbon Nanotubes Through Pyrolysis of
    Acetylene Using Rare Earth Alloy as Catalyst in Hydrogen
AU: Author
    Zhu, Yanjuan; Chen, Yulian; Chen, Jian; Lin, Tianjin; Zhang, Chunhua;
    Liu, Qiuxiang; Zhang, Haiyan
SO: Source
    Journal of Rare Earths (English Edition). Vol. 22, no. 6, pp. 859-863.
    Dec. 2004
DE: Descriptors
    Carbon nanotubes; Synthesis; Catalysts; Rare earth alloys; Precursors;
    Pyrolysis; Process parameters
AB: Abstract
    High-purity carbon nanotubes (CNTs) were synthesized in hydrogen
    ambience by CVD method by using rare earth alloy MlM5-1.35(CoAlMn)1.35
    as catalyst, acetylene as carbon source. The influence of hydrogen
    flow rate on the diameter, shape, purity, graphitization degree and
    output of carbon nanotubes was systematically studied by scanning
    selectronic microscopy ( SEM) , transmission electron microscopy (TEM)
    , X-ray diffraction( XRD) and Raman technique. The results indicate
    that the size of M1M alloy particles changed from p m order into nm
    order during the process of hydrogen reduction. While no introducing
    hydrogen in the reaction of acetylene and catalyst, CNTs can also be
    synthesized on the catalyst. The CNTs are short and thick with average
    diameter of about 97. 8 nm, and the wall of CNTs is also thick and
    rough. With increasing of hydrogen flow rate, the diameter of CNTs
    first decrease and then increase, while the output, purity, and
    graphitization degree first increase and then decrease. The optimized
    conditions are: CNTs reach its narrowest size with diameter of 49.1 nm
    when hydrogen flow rate is 50 ml min-1. The purity. graphitization
    degree, and output of CNTs reach highest and largest when hydrogren
    flow rate is 75 ml min-1. It has the most uniform tube size of 97. 38
    nm when hydrogen flow rate is 100 ml min-1.

Record 13 of 64

DN: Database Name
    METADEX
TI: Title
    A COMPOSITE PROTECTIVE AGENT FOR IRON RELICS PART II
AU: Author
    Xu, Chun-Chun; Yu, Kai; Li, Zi-Feng
SO: Source
    Corrosion Science and Protection Technology. Vol. 16, no. 6, pp.
    408-410. Nov. 2004
DE: Descriptors
    Iron; Protective coatings; Nanostructure; Corrosion prevention;
    Shields; Corrosion inhibitors
AB: Abstract
    An efficient composite protective agent for iron relics was studied
    and its main performances were tested according to the requirement for
    the conservation of iron cultural relics in this paper. Nano-materials
    were dispersed in the pure acrylic emulsion to form nano-composites.
    Nano-composites are used as top-coat and pure acrylic emulsion with
    corrosion inhibitors is used as base coat for the conservation of iron
    cultural relics. It is found that the composite protective coatings
    performed well in many aspects, such as ultraviolet shield and
    resistance to pollution etc. The composite protective agent is
    promising for the conservation of iron cultural relics.

Record 14 of 64

DN: Database Name
    METADEX
TI: Title
    A COMPOSITE PROTECTIVE AGENT FOR IRON RELICS PART I
AU: Author
    Xu, Chun-Chun; Yu, Kai; Li, Zi-Feng
SO: Source
    Corrosion Science and Protection Technology. Vol. 16, no. 6, pp.
    406-407. Nov. 2004
DE: Descriptors
    Iron; Corrosion inhibitors; Corrosion prevention; Electron
    microscopes; Immersion tests (corrosion)
AB: Abstract
    Iron objects are easily oxidized and eroded, an efficient composite
    protective agent for iron relics is studied in this paper.
    Nano-materials were dispersed in water by adding dispersing agents,
    the excellent dispersing agents were selected by subsiding method, the
    dispersive state was tested by transmission electron microscope.
    Several inhibitors were evaluated for iron in water by immersion test,
    the result manifested that the composite corrosion inhibitor embodied
    excellent function of anti-corrosion for iron in water and in 3.5 %
    NaCl solution.

Record 15 of 64

DN: Database Name
    Recent References Related to Technology
TI: Title
    Development of AC magnetic heating setup for cancer therapy with
    magnetic fluid hyperthermia
SO: Source
    Dongnan Daxue Xuebao/Journal of Southeast University (Natural Science
    Edition), vol. 34, pp. 794-796, Nov. 2004
DE: Descriptors
    Magnetic fields; Alternating current; Setups; Cancer; Fluids;
    Hyperthermia; Fluid dynamics; Heating; Fluid flow; Therapy;
    Efficiency; Winding; Excitation; Topology; Conversion; Circuits;
    Variability; Nanostructure; Magnetic pole; Wire bridge circuits
AB: Abstract
    The setup produces an AC (alternating current) magnetic field at the
    gap between the magnetic poles. Ferrite core in excitation winding
    enhances the magnetic field intensity, and bridge topology in circuit
    achieves high efficiency of power conversion. The frequency and
    magnetic field intensity are 25 - 120 kHz and 6 - 16 kA/m,
    respectively. Intensity measurement shows the uniformity of the
    magnetic field. The temperature increment of the magnetic
    nano-materials can be up to 28(degree)C with magnetic heating under
    room temperature. The results suggest a way for clinical application
    in the magnetic fluid hyperthermia (MFH) cancer therapy.

Record 16 of 64

DN: Database Name
    METADEX
TI: Title
    Nano surface engineering and remanufacture engineering
AU: Author
    Xu, Bin-Shi
SO: Source
    Transactions of the Nonferrous Metals Society of China. Vol. 14, no.
    2, pp. 1-5. Oct. 2004
DE: Descriptors
    Nanoengineering; Surface treatment; Manufacturing engineering;
    Nanomaterials; Remanufacturing; Electroplating; Brush plating; Thermal
    spraying; Antifriction
AB: Abstract
    Nano surface engineering and remanufacture engineering are introduced,
    and the relationship between them is set forth. It points out the
    superiority of nano surface engineering to the traditional one, and
    reveals the advantages of remanufacture engineering. Taking some nano
    surface techniques as samples, such as nano-materials brush
    electroplating, nano-materials thermal spraying and nano-materials
    self-repairing antifriction additive technology, it shows the
    applications of nano surface engineering technology to remanufacturing
    mechanical parts.

Record 17 of 64

DN: Database Name
    METADEX
TI: Title
    In situ synthesis of TiN particulate/titanium silicide matrix
    composite powder by mechanochemical process
AU: Author
    Shim, Jae-Hyeok; Byun, Jung-Soo; Cho, Young Whan
SO: Source
    Journal of the American Ceramic Society. Vol. 87, no. 10, pp.
    1853-1858. Oct. 2004
DE: Descriptors
    Particulate composites; Titanium nitride; Crystallites; Ceramic matrix
    composites; Self-propagating synthesis; Ceramic powders; Ball milling;
    Silicides; Silicon nitride; Transmission electron microscopy; X-ray
    diffraction; Scanning electron microscopy; Intermetallics
AB: Abstract
    TiN particulate/Ti5Si3 matrix composite powder has been synthesized
    from Ti and Si3N4 powders employing high-energy ball milling. The
    milled powders have been characterized by X-ray diffraction, scanning
    electron microscopy, and transmission electron microscopy. TiN/Ti5Si3
    composite powder is formed by a displacement reaction between Ti and
    Si3N4 during milling, and the reaction progresses in a mechanically
    induced self-propagating reaction form. The milled powder consists of
    TiN crystallites of a few hundred nanometers embedded in Ti5Si3
    matrixes. After 20 h of milling, the crystallite size of TiN becomes
    about 5 nm.

Record 18 of 64

DN: Database Name
    METADEX
TI: Title
    TiNano Coat, a New Thermal Spray Product from Altair Nanotechnologies
SO: Source
    Journal of Thermal Spray Technology. Vol. 13, no. 3, pp. 318-319.
    Sept. 2004
DE: Descriptors
    Nanostructure; Titanium dioxide; Ceramic coatings; Pigments
AB: Abstract
    Altair Nanotechnologies, Inc., a company engaged in developing
    nanomaterials, titanium dioxide pigment technology, and materials
    science focused on nanostruc-tures, has announced that its novel
    nano-materials thermal spray grade powder, Ti-Nano Coat, demonstrated
    significantly superior mechanical properties in a com-petitive study
    performed by the National Research Council (NRC) of Canada. The study
    was performed at NRC's state-of-the-art Industrial Materials Institute
    fa-cilities in Boucherville, Quebec, from November 2003 through
    February 2004. Contact: Marty Tullio or Mark Tullio, McCloud
    Communications, LLC; tel: 949/566-9860; e-mail: marty@
    mccloudcommunications.com; David A. Warar, Global Strategy, Inc.; tel:
    847/ 367-9557; e-mail:
  1   2   3   4

Похожие:

Tue Oct 11 16: 48: 55 cst 2005 iconDraft last updated Oct 12, 2005 11pm

Tue Oct 11 16: 48: 55 cst 2005 iconMonday, 19-oct-09 to thursday, 22-oct-09

Tue Oct 11 16: 48: 55 cst 2005 iconFrom Tue Apr 15 11: 25: 12 1997

Tue Oct 11 16: 48: 55 cst 2005 iconTue and Thurs. 4: 00~5: 30PM

Tue Oct 11 16: 48: 55 cst 2005 iconFrom sedsnm Tue May 26 16: 06: 09 1998

Tue Oct 11 16: 48: 55 cst 2005 iconLast reviewed: 13-Oct-99

Tue Oct 11 16: 48: 55 cst 2005 iconMon Oct 8 08: 11: 59 2007

Tue Oct 11 16: 48: 55 cst 2005 iconSuperman set (6) [oct 07 wow]

Tue Oct 11 16: 48: 55 cst 2005 iconHow the Internet Invented Howard Dean Oct 2008

Tue Oct 11 16: 48: 55 cst 2005 iconQ-vector Ch. 4 5 Sept. 29 Exam 1 (material covered up to 9-22-09) 5 Oct. 1 The Q

Разместите кнопку на своём сайте:
Библиотека


База данных защищена авторским правом ©lib.znate.ru 2014
обратиться к администрации
Библиотека
Главная страница