Solid phase

Xem 1-20 trên 86 kết quả Solid phase
  • A new automated procedure for preconcentration and analysis of anionic surfactants in water using solid-phase extraction (SPE) in a flow injection (Fl) system together with an UV-vis detection is reported in this paper. The method involves extraction of blue coloured ion-pair complex of anionic surfactants and methylene blue into solid phase and their elution from the SPE column with organic solvent (chloroform stabilised with methanol) and subsequent measurement in an UV-vis flow cell at 650 nm. The system is well optimised before to apply for analysis of real samples.

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  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Solid-phase microextraction for bioconcentration studies according to OECD TG 305

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Solid-phase microextraction for bioconcentration studies according to OECD TG 305

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  • Tham khảo tài liệu 'báo cáo hóa học: "solid-phase microextraction for bioconcentration studies according to oecd tg 305"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A solid-phase dot assay using silica/gold nanoshells

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  • Octadecyl grafting silica was synthesized using trimethoxyoctadecyl silane. Reaction conditions were optimized so that the carbon percentage of resulted material was similar to that of commercial products. Temperature and catalyst played very important roles in the reaction. The material was also undergone the end-capping process to reduce unreacted silanol groups.

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  • According to ASTM Standard Guide nondestructive term Test, the sound emission is usually defined as the class of phenomena whereby transient elastic waves generated by the rapid release of energy from source localization in the material. Energy consumption is essentially due to phase converter, crack formation and development, friction or movement of dislocations. Acoustic emission signal can be generated by phenomena such as cavitation, leakage, solidification and liquefaction.

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  • Epoxy resin networks have been modified with hybrid copolymer consisting of an urethane prepolymer and a solid bisphenol A diglycidyl ether. Hybrid copolymer prepared from isocyanate-terminated urethane (NCOPUER) resulted in cured transparent epoxy networks with no discernible phase-separated morphology, as indicated by scanning electron microscopy.

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  • (BQ) Part 2 book "Chiral separation techniques" has contents: Membranes in chiral.Separations; enantiomer separations using designed imprinted chiral phases, enantiomer separations using designed imprinted chiral phases, nonchromatographic solid phase purification of enatiomers,...and other contents.

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  • Studies assessing the role of ICTP levels in GCF or peri-implant crevicular fluid as a diagnostic marker of periodontal disease activity have reported promising results so far (Oringer et al. 1998, 2002). ICTP was suggested to predict future bone loss, to correlate with clinical parameters and putative periodontal pathogens and also to reduce following periodontal therapy (Giannobile 1999).

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  • While patterns of improvement can be observed as greater or lesser according to the background characteristics of students in this study, statistical analysis has meant that no generalisation regarding the kind of student most likely to improve can be reliably made. It is nevertheless interesting to consider the characteristics of each of the individuals who did show the greatest increase in their IELTS Test results. Of the 40 students who participated in this study, only eight managed to improve by one IELTS band in their Overall score.

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  • This first part is concerned with processes in which the kinetic behaviour of a gaseous phase is rate-determining. The range of processes includes some which are carried out in vacuum systems in which Knudsen or free evaporation occurs from a condensed phase, to transport reactions where a chemical reaction occurs between a solid and the gaseous phase to produce molecular species containing some or all of the elements occurring in the solid phase.

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  • Soil Solution–Solid Phase Equilibria Có một số phản ứng hóa học phức tạp có thể xảy ra trong đất. Những phản ứng khác nhau tương tác với nhau thông qua các giải pháp đất (Hình 4.1). Các dung dịch đất được định nghĩa là giai đoạn lỏng dung dịch nước của đất và các chất tan của nó (Bảng thuật ngữ của Điều khoản Khoa học Đất, 1997).

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  • Fractures are ubiquitous in the brittle lithosphere in the upper part of earth’s crust. They play a critical role in the transport of fluids. Moreover, all major discovered geothermal reservoirs and a considerable number of petroleum reservoirs are in fractured rocks. This restates the importance of studying multiphase flow behavior inside the opened fracture space. From the engineering point of view, a rock fracture as defined here is simply a complex-shaped cavity filled with fluids or solid minerals. Therefore it is understood to include cracks, joints, and faults.

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  • This epigraph is very correct for the Russian Federation today because the average lifespan of Russian men in this country is 57 years (Russian women are living on ten years more). It is statistical data. Russian scientists are an exception. Particularly, the majority of contributors of this volume are older then 60 and the editor of volume is older then 75.

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  • Porous hydroxyapatite ceramic was synthesized by solid phase method using Ca(OH)2 and Ca3(PO4)2 at the temperature interval 200 - 350o C. The samples, after pelleting and sintering, were characterized by X-ray diffractometry (XRD), Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). Porous structure of hydroxyapatite was obtained with the 42 – 55% porosity.

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  • The Physical Chemistry In Brief offers a digest of all major formulas, terms and definitions needed for an understanding of the subject. They are illustrated by schematic figures, simple worked-out examples, and a short accompanying text. The concept of the book makes it different from common university or physical chemistry textbooks. In terms of contents, the Physical Chemistry In Brief embraces the fundamental course in physical chemistry as taught at the Institute of Chemical Technology, Prague, i.e.

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  • Research activities in laser physics and in photonics technologies over the last two decades have continuously produced a large diversity of new advances. Several examples illustrate the major impact of optics in the quantum sciences, engineering, metrology, communication fiber networks, or high-capacity data storage. Besides these established fields of research and development for industry or for the consumer markets, laser optics will certainly disseminate in the near future in new areas such as biology, chemistry, medicine, or nanotechnologies.

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  • Chemical reactions (abiotic reactions) are “classical” chemical reactions that are not mediated by bacteria. They may include reaction processes such as precipitation, hydrolysis, complexation, elimination, substitution etc. that transform chemicals to other chemicals and potentially alter their phase/state (solid, liquid, gas, dissolved). Precipitation is the removal of ions from solution by the formation of insoluble compounds, i.e. a solid-phase precipitate. Hydrolysis is a process of chemical reaction by the addition of water.

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  • Introduction: The electrolyte solution is a major component of all battery systems and as such will greatly influence energy densities (thermodynamic properties such as Gibbs energy, enthalpy, and ionic activity) and power densities (nonthermodynamic properties such as viscosity, conductivity, and transference). The electrolyte solution consists of a liquid or solid phase containing at least one component, e.g., water, which is called the solvent, and an ionizable substance, e.g., a salt or an acid, which is called the electrolyte. ...

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