Xem 1-20 trên 2287 kết quả Characterization
  • Phương pháp chuyển từ môi trường mô phỏng này sang môi trường mô phỏng khác, lựa chọn hệ nhiệt động và cấu tử trong dầu thô, đặc trưng dầu thô trong HYSYS,... là những nội dung chính trong bài giảng "Crude Oil Characterization: HYSYS Oil-1". Mời các bạn cùng tham khảo.

    pdf32p ntchung8894 11-12-2015 15 7   Download

  • The importance of particle characterization in both the research and development, and the manufacture and quality control of materials and products that we use in our everyday lives is, in some sense, invisible to those of us not directly involved with these activities. Few of us know how particle size, shape, or surface characteristics can influence, for example, the efficacy of a painreliever, or the efficiency of a catalytic converter, or the resolution of a printer.

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  • The basic distinction between already known algorithmic characterizations of matroids and antimatroids is in the fact that for antimatroids the ordering of elements is of great importance. While antimatroids can also be characterized as set systems, the question whether there is an algorithmic description of antimatroids in terms of sets and set functions was open for some period of time.

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  • This work presents the preparation of nanocomposite TiO2/SnO2 films by using spray pyrolysis and followed by sol-gel technique from TiCl4 and SnCl4 solutions. Obtained films were characterized by XRD, SEM and photoconductivity measurement. It was found that in this method the nanocomposite TiO2/SnO2 films were constituted of nanosized TiO2 and SnO2 surrounded the TiO2 grains. The obtained nanocomposite TiO2/SnO2 materials were shown to have the photoconducting properties.

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  • We report unambiguous proof of the stability of a carbinol intermediate in the case of P450 metabolism of an N-methylated natural cyclo-peptide, namely tentoxin. Under mild acidic or neutral conditions, the lifetime of carbinol-amide is long enough to be fully characterized.

    pdf12p cosis54 05-01-2013 14 2   Download

  • Tham khảo tài liệu 'báo cáo khoa học: molecular characterization of secretory proteins rv3619c and rv3620c frommycobacterium tuberculosish37rv', luận văn - báo cáo, báo cáo khoa học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • This study characterized the human apolipoprotein H [APOH; b2-glycopro-tein I (b2GPI)] promoter and its variants byin vitro functional experiments and investigated their relationship with human plasmab2GPI levels. We examined the individual effects of 12 APOHpromoter single nucleotide polymorphisms in the 5¢ flanking region ofAPOH(1.4 kb) on luciferase activity in COS-1 cells and HepG2 cells and their impact on plasma...

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  • This opinion paper discusses subjective natural language problems in terms of their motivations, applications, characterizations, and implications. It argues that such problems deserve increased attention because of their potential to challenge the status of theoretical understanding, problem-solving methods, and evaluation techniques in computational linguistics. The author supports a more holistic approach to such problems; a view that extends beyond opinion mining or sentiment analysis.

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  • In this paper, we propose an implementable characterization of genre suitable for automatic genre identification of web pages. This characterization is implemented as an inferential model based on a modified version of Bayes’ theorem. Such a model can deal with genre hybridism and individualization, two important forces behind genre evolution. Results show that this approach is effective and is worth further research.

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  • Miscommunication in speech recognition systems is unavoidable, but a detailed characterization of user corrections will enable speech systems to identify when a correction is taking place and to more accurately recognize the content of correction utterances. In this paper we investigate the adaptations of users when they encounter recognition errors in interactions with a voice-in/voice-out spoken language system.

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  • Since the early Sixties and Seventies it has been known that the regular and context-free languages are characterized by definability in the monadic second-order theory of certain structures. More recently, these descriptive characterizations have been used to obtain complexity results for constraint- and principle-based theories of syntax and to provide a uniform model-theoretic framework for exploring the relationship between theories expressed in disparate formal terms.

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  • The synthesis and characterization of chitosan (CS) nanoparticles used as drug carrier was reported. The formation of nanoparticles, taking place in an aqueous phase without using auxiliary toxic substances via the ionic interaction between NH3 + protonated group of CS and phosphate group of sodium tripolyphosphate (TPP) was monitored in situ by combined UV-vis and pH measurements. The synthesized nanoparticles were characterized by TGA/DTA, XRD and TEM. The particle size, estimated by TEM, was found around 50 - 70 nm, with a quite uniform size distribution.

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  • Structural Characterization of Crystalline and Non-crystalline Materials – A Brief Background of Current Requirements The X-ray powder diffraction technique is a well-established and widely used method for both qualitative and quantitative analysis of various substances in a variety of states (see, for example, [1]). However, in a multi-component mixture with a relatively complicated chemical composition, we frequently find difficulty in identifying the individual chemical constituents by the conventional X-ray powder diffraction method.

    pdf212p gian_anh 18-10-2012 6 1   Download

  • Preparation, characterization and application of heterogeneous solid base catalyst for biodiesel production from soybean oil has many contents: Preparation of catalyst, haracterization of the catalys, ransesterification of soybean oil and chemicalanalyses, creening of catalyst, atalyst characterizations, fluence of the transesterification reactionconditions,...

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  • Soy proteins as plywood adhesives: formulation and characterization to develop and characterize formaldehyde free soybean wood adhesives with improved water resistance. Second order response surface regression models were used to determine the effects of soy protein isolate concentration, sodium chloride, and ph on adhesive performance.

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  • Gingivitis and periodontitis are the two main periodontal diseases and may be present concurrently. Gingivitis is a form of periodontal disease in which gingival tissues are inflamed but their destruction is mild and reversible while periodontitis is a chronic inflammatory response to the subgingival bacteria with irreversible changes (Armitage, 1999). Periodontium destruction is characterized by loss of connective tissue attachment and bone around the teeth in conjunction with the formation of periodontal pockets due to apical migration of the junctional epithelium (Champagne et al.

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  • Extrusion processing is widely utilized in the food and feed industries for the manufacture of value-added products. Extrusion processing is a versatile technology producing a wide range of products, including confectionery products, pasta, ready-to-eat (RTE) cereals, flat bread, snack products, texturized proteins, and pet foods.

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  • A soft ground condition exists whenever construction loads a cohesive foundation soil beyond its preconsolidation stress, as often occurs with saturated clays and silts having SPT blow counts that are near zero. The paper recommends testing programs, testing methods and data interpretation techniques for developing design parameters for settlement and stability analyses. It hopes to move the state-of-practice closer to the state-of-the-art and thus is intended for geotechnical practitioners and teachers rather than researchers.

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  • Encyclopedia of Materials Characterization is a comprehensive volume on analytical techniques used in materials science for the characterization of surfaces, interfaces and thin films. This flagship volume in the Materials Characterization Series is a unique, stand-alone reference for materials science practitioners, process engineers, students and anyone with a need to know about the capabilities available in materials analysis. An encyclopedia of 50 concise articles, this book will also be a practical companion to the forthcoming books in the Series.

    pdf0p beobobeo 01-08-2012 45 20   Download

  • This type of coatings is also characterized with a large number of grain boundaries with a crystalline/amorphous transition across grain–matrix interfaces, restricting the rise and development of cracks. Such mechanism explains the resistance to fragile cracking of nanocomposite coatings (Veprek, 1997; Veprek, 1998; Rafaja et al., 2006).

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