Báo cáo " Sol-gel synthesis and particle size characterization of CdSe Quantum dots " ppt
Báo cáo " Sol-gel synthesis and particle size characterization of CdSe Quantum dots " ppt
... VNU Journal of Science, Mathematics - Physics 25 (2009) 207-211 207 Sol-gel synthesis and particle size characterization of CdSe Quantum dots Khong Cat Cuong1, Trinh ... long time reaction and its distribution in particle size is in the broadening range. In this article, we report on the preparation of CdSe quantum dots (QDs) by sol-gel method and investigate ... The TEM images of samples show that the mean sizes of QDs are 4 nm. The mean sizes of QDs are smaller than that of other methods and arranging from 2 to 3.6 nm. 1. Introduction Size- dependent...
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Báo cáo khoa học: Amyloid oligomers: spectroscopic characterization of amyloidogenic protein states docx
... oligomers: spectroscopic characterization of amyloidogenic protein statesMikael Lindgren1 and Per Hammarstro¨m21 Department of Physics, Norwegian University of Science and Technology, Trondheim, ... thio-flavin T (ThT) [4] and Congo red [5], with concomitantalterations of their optical properties in terms of, forexample, fluorescence quantum efficiency and theirinfluence of polarized light rendering ... the structure and properties of proteins has a long history, and techniques for pro-tein-structure characterization cover a very wide range of techniques. As proteins in native and other thermo-dynamically...
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Tài liệu Báo cáo khoa học: "Understanding the Semantic Structure of Noun Phrase Queries" pptx
... class.The first type of lexicon is an IH lexicon com-prised of a list of attribute names for the intentclass, e.g., “box of ce” and “review” for the intentclass Movie. One easy way of composing such ... primary focus of previous works, but also understandingtheir semantic structure. In this work, weformally define the semantic structure of noun phrase queries as comprised of intentheads and intent ... rolesbased on Markov and semi-Markov con-ditional random fields. We show that theuse of semantic features and syntactic fea-tures significantly contribute to improvingthe understanding performance.1...
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Tài liệu Báo cáo khoa học: "Parsing with generative models of predicate-argument structure" pptx
... the same span and the same categoryare considered equivalent if they delay the evalua-tion of the probabilities of the same words and ifthey have the same number of lexical heads, and ifthe ... not distinguish betweenthe dependency relations of Hij and geeft in thefirst sentence, bloem and geeft in the second sen-tence and politieman and geeft in the third sentence.Even with the indices, ... the lexical cate-gory of the head word of is a ditransitive. Therefore, we assume thatthe non-head child of a node is only expanded afterthe head child has been fully expanded.5.2 Modelling...
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Tài liệu Báo cáo khoa học: "Evaluating the Inferential Utility of Lexical-Semantic Resources" ppt
... al., 2007) and applications such as Information Retrieval and Question Answering (Shah and Croft, 2004; Pasca and Harabagiu, 2001). Beyond WordNet (Fell-baum, 1998), a wide range of resources ... distributional methods (Lin-dep and Lin-prox) and combinations of pattern-based and distributional methods (CBC and Snow30k).5 Results and AnalysisThe results and analysis described in this sectionreveal ... Bar-Haim and Idan Szpektorfor helpful discussion and advice. This work waspartially supported by the Negev Consortium of the Israeli Ministry of Industry, Trade and Labor,the PASCAL-2 Network of...
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Báo cáo khoa học: "An Extensive Empirical Study of Collocation Extraction Methods" ppt
... result of their combination (Manning and Schütze, 1999). We think of a corpus as a ran-domly generated sequence of words that is viewed asa sequence of word pairs. Occurrence frequencies of these ... lemmas and part -of- speech of the compo-nents, and type of dependence between the compo-nents.For each bigram type we counted frequencies inits contingency table, extracted empirical and imme-diate ... lesstimes in the data and thus we obtained a referencedata set which fulfills requirements of a sufficient size and a minimal frequency of observations whichis needed for the assumption of normal distributionrequired...
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Báo cáo khoa học: "ON THE LINGUISTIC CHARACTER OF NON-STANDARD INPUT" ppt
... CHARACTER OF NON-STANDARD INPUT Anthony S. Kroch and Donald Hindle Department of Linguistics University of Pennsylvania Philadelphia, PA 19104 USA ABSTRACT If natural language understanding ... discuss each of the above cases with examples, drawing on work we have done describing the differences between the syntax of vernacular speech and of standard writing (Kroch and Nindle, 1981). ... source of non-standard input would be in a functioning system is hard to judge and would * The discussion in this paper is based an on-going study of the syntactic differences between written and...
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Báo cáo khoa học: Fibroblast growth-stimulating activity of S100A9 (MRP-14) ppt
... concentration of the exudate was also determined. Each point represents themean ± standard errors of 4–6 rats.Fig. 5. Formation of granulation tissue and retention of exudate.Granulation tissue and ... amounts of recombinantFig. 3. Comparison of the amino acid sequence of rat S100A9 and peptides isolated fromFGSF. The identified amino acid residues of acyanogen bromide-cleaved peptide (CN-3) and ... Escherichia coli,purified, and analyzed on SDS/PAGE (Fig. 2). A singleband had a molecular mass of 13.6 kDa and was not alteredby reduction. The sequence of N-terminal 10 residues of recombinant S100A9...
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Tài liệu Báo cáo khóa học: Non-specific depolymerization of chitosan by pronase and characterization of the resultant products pptx
... comparison of band absorbance. Absence of a sharp and convolutedspectral band around 3600–3000 cm)1in the spectra of bothchitosan and LMWC indicated the absence of free -OHgroups and the involvement ... rate of 1.0 mLÆmin)1 and detected using anRI detector. Chito-oligomers and GlcNAc were used asstandards.Further characterization of chitosan and thedepolymerization productsFurther characterization ... linearpolysaccharide of b1fi4-linked 2-deoxy-2-acetamido-D-glu-cose units [1], that constitutes the exoskeleton of inverte-brates and is one of the components of the cell walls of fungi. It has wide and varied...
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Tài liệu Báo cáo Y học: The effects of ring-size analogs of the antimicrobial peptide gramicidin S on phospholipid bilayer model membranes and on the growth of Acholeplasma laidlawii B ppt
... relative potencies of GS and its ring -size analogs inperturbing the organization and increasing the permeability of phospholipid bilayer model membranes, and of inhibitingthe growth of A. laidlawii ... excitation and emission of 3 nm and quartz cells of 1-cm path length; the excitation and emission were recorded at wavelengths of 496 and 516 nm, respectively.The A. laidlawii B cells were grown and ... themid log phase of growth.RESULTSStructure and biological activities of GS ring -size analogsThe amino acid sequences and the 3D structures of the threering -size analogs of GS studied here...
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