mineralogy and chemistry of cements

... (University of Leoben, Karl-Franzens University of Graz, Graz University of Technology) in Leoben An accelerating voltage of 15 kV, a beam current of 10 nA, count times of 60 seconds on peaks and 30 ... and alcohol Analyses of K and Ar from biotite separates and calculation of ages and errors were carried out at the Research Institute of Natural Sciences, Okayama University of Science (Japan), ... shape of primary corundum of type I (a) and of type II (b) The various colorations of these corundum vary from dark bluish gray (a) and yellowish gray (c) for type I to dark brownish red (b) and

Ngày tải lên: 16/12/2017, 18:07

... infiltration zone and the discharge point [5] The 18 16 13 12 H, O/ O, andof C/ respectively The value ofthe 1C samples 18 16 and standards, O/ O,ratios and 1 3of C/12 standards, Theof value ofthedetermination ... roof of the premises of the Center for Nuclear Techniques in Ho Chi Minh (HCM) city The surface water was sampled at a depth of 0.5 m from the surface and around m from the bank of the Tien and ... per mil (‰) The standard used in the analyses based on the data of C activity and d C in the TDIC The 14 of the water stable isotopes is the Vienna Standard of Mean principle of the C-dating method

Ngày tải lên: 13/01/2020, 15:55

... oil and gas production Because of the high cost of geophysical exploration of offshore areas, clay mineralogical studies become even more important as an aid to understanding diagenetic and thermal ... sandstones and basaltic lava flows, continues with shallow marine marls, limestones, and then deep marine limestones, and ends with deep sea sandstones and shales In the western part of the İstanbul ... Journal of Earth Sciences Turkish J Earth Sci (2016) 25: 592-610 © TÜBİTAK doi:10.3906/yer-1601-10 http://journals.tubitak.gov.tr/earth/ Research Article Clay mineralogy and geochemistry of three offshore

Ngày tải lên: 13/01/2020, 19:30

... Comparative study of the mobility of major and trace elements during alteration of an andesite and a rhyolite to bentonite, in the islands of Milos and Kimolos, Aegean, Greece Clays and Clay Minerals ... and 0.40 in Alt, and between 0.20 and 0.53 in Ymt samples Although most of the studied samples are andesites and basalt in the Winchester and Floyd diagram, Eu/Eu* does not comply with the andesites, ... km southwest of the study area are of basaltic andesite to dacite composition (Ekici 2003; Ekici et al 2009) and show a typical calc-alkaline character Weathering of basaltic and andesitic volcanic

Ngày tải lên: 13/01/2020, 19:34

... spectra of each group Group consists of pale blue glasses with about 18 wt% of Na 2O and 6.5 wt% of CaO Despite the glasses belonging to this group have about 0.5 wt% of MnO and 0.7 wt% of Fe2O3; ... identification of ionic species and, under certain conditions, the quantification of Fe2+ and Fe3+ The ratio of the oxidation states of iron gives an insight into the technological aspects of production ... www.sciencedirect.com Procedia Chemistry (2013) 55 – 64 Youth in Conservation of Cultural Heritage, YOCOCU 2012 Colour and Chemistry of the glass finds in the Roman villa of Treignes, Belgium Andrea Cegliaa,b,c*,Wendy

Ngày tải lên: 01/11/2022, 09:13

... heat, muscular, and nervous energy... proportion of calcium phosphate for the growth of their bones, whilst adults require less The outer part of the grain of cereals is the ... other two classes, and cannot well be excluded from consideration Water forms an essential part of all the tissues of the body It is the solvent and carrier of other substances... ... loss of their natural saline constituents Natural and properly cooked foods are so rich in sodium chloride and other salts that the addition of common salt is unnecessary An excess of

Ngày tải lên: 28/06/2014, 19:20

... ORGANIC AND PHYSICAL CHEMISTRY OF POLYMERS ORGANIC AND PHYSICAL CHEMISTRY OF POLYMERS Yves Gnanou Michel Fontanille A JOHN WILEY & SONS, INC., PUBLICATION ORGANIC AND PHYSICAL CHEMISTRY OF POLYMERS ... physical chemistry Organic and Physical Chemistry of Polymers by Yves Gnanou and Michel Fontanille provides a unique approach to combine fundamentals of organic and physical chemistry and apply ... polymer chemistry and the physical chemistry and physics of polymers Through the description of the structures found in polymers and the reactions used to synthesize them, through the account of their

Ngày tải lên: 14/08/2014, 10:20

... shortcoming, Flory modified the initial version of his model and reconsidered the assumptions of an enthalpy of mixing and of an energy of contact independent of the temperature. Observing that in solutions ... the function of volume fraction of the aqueous solution for various values of χ 12 and the degree of polymerization X. higher than 0.5, these curves show a maximum and two minima and therefore ... concentration of polymer, V 2 the partial specific volume of the polymer, and V 2 0 its molar volume, and considering that X is also the ratio of the molar volume of polymer to that of the solvent

Ngày tải lên: 14/08/2014, 10:20

... mass of the solute, V1 and V2 are the volumes occupied by the solvent and the solute, N1 and N2 are the number of molecules of solvent and solute, and M2 is the molar mass of ... interpenetration of the “threads” of a left-handed helix with those of the four right-handed helices which surround it and vice versa. Figure 5.18 represents an arrangement of such chains in which the size of ... between two pairs of bases, between the adenosine of one strand and the thymidine of another, and likewise between cytidine and guanosine. This double helix was identified by Crick and Watson in 1954;

Ngày tải lên: 14/08/2014, 10:20

... DETERMINATION OF MOLAR MASSES AND STUDY OF CONFORMATIONS & MORPHOLOGIES where r e is the radius of an electron (2.81 ×10 −15 m) and Z is the difference between the number of electrons of constitutive ... of “MALDI” (Matrix-Assisted Laser Desorption Ionization) equipped with a “time of flight” (TOF) spectrometer offers an elegant and effective method for the precise and absolute determination of ... volume of 1 g of the polymer analyzed within the limit of infinite dilutions. Insofar as relations can be established between the hydrodynamic volume of a polymer of a given conformation and its

Ngày tải lên: 14/08/2014, 10:20

... to that of monomer B eA and eB measures the polarities of both radicals (∼∼∼∼A• and ∼∼∼∼B• ) and monomers (A and B), respectively It is normal that the polarity of the radical and that of the ... concentration of polymeric free radicals and to a rise of the temperature in the reaction medium due to the exothermicity of the polymerization; Because of the high value of the energy of activation of ... Determination of r1 and r2 Reactivity Ratios All the methods of determination of reactivity ratios are based on the determination of the composition of the copolymer obtained from various mixtures of comonomers

Ngày tải lên: 14/08/2014, 10:20

... comparison of a pK a of 41 with that of water which is the conjugated acid of metal hydroxides gives an idea of the very high reactivity of the conjugate base. This imposes that monomers are free of ... r 1 and r 2 are the ionic radius of cation and anion, respectively, and e is the electron charge. This relation shows that by increasing the apparent ionic radius of the cation and that of the ... regio- and stereospecificity, depending upon the solvent in which it is dispersed. ANIONIC POLYMERIZATION 313 8.6.2.3. Effect of the Nature of the Solvent and that of Potential additives. Because of

Ngày tải lên: 14/08/2014, 10:20

... the PZT The software of the FFM mainly consists of three parts: ͑1͒ the program of scanning, data collecting, and image displaying, ͑2͒ the program of making force curve of cantilever and setting ... by Dowson and Higginson ͓10͔, Hamrock and Dowson ͓11͔, Archard and Cowking ͓12͔, Cheng and Sternlicht ͓13͔, Yang and Wen ͓14͔, and so on The width of the chasm between fluid lubrication and boundary ... occurrence of stick-slip depends on the sliding velocity and the stiffness of the system, and the mechanism of the phenomenon can be interpreted in terms of periodic transition between liquid and solid...

Ngày tải lên: 04/06/2014, 15:09

... Wyckoff’s volumes, Crystal Structures, and Pearson’s The Crystal Chemistry and Physics of Metals and Alloys Refinements are available for some of these structures The descriptions and figures of ... also reverse the roles of pairs of T layers (Tþ and TÀ ) with the roles of P and O together The first T layer above a P layer is Tþ , and this becomes O and TÀ becomes P P and O layers become T ... framework for considering the mechanism of formation and transformation of crystal structures The transformations of structures of metals, ccp, hcp, and bcc, are of particular interest These are considered...

Ngày tải lên: 06/07/2014, 15:30

... age of iron and steel and with it the era of machines and of rapid transportation and communication.”10 Black powder remains a viable energetic material today; it ignites readily and reliably and ... Out of the atomic theory developed by John Dalton and other chemistry pioneers in the nineteenth century grew a number of important concepts essential to an understanding of all areas of chemistry, ... quantities of atoms of various elements The same concept holds for molecules One mole of water (H2O) consists of 6.02 × 1023 molecules and has a mass of 18.0 grams It contains mole of oxygen atoms and...

Ngày tải lên: 22/03/2014, 09:20

... The Chemistry of C-C π-Bonds - - Alkene and Alkyne chemistry I  Alkene chemistry Structures and influence of orbitals on reactivity: How alkenes react and why? Typical reactions of alkenes: ... Borderline N3-, -CN, RNH2, Br- Soft I-, RS-, RSH, R3P, R2S Soft = The Chemistry of C-C π-Bonds - 38 - Examples of addition of HARD and SOFT nucleophiles:  Addition of thiolate anion: O  SPh PhSH, ... by orbitals The effect of the nucleophile: hard and soft nucleophiles and electrophiles The effect of the electrophile Books “Organic Chemistry , Clayden, Greeves, Wothers and Warren, OUP, 2000...

Ngày tải lên: 22/03/2014, 20:20

... analytical techniques, and manufacturing technologies have raised a number of issues of concern to producers and users of gypsum products alike For example, the analysis of gypsum and gypsum products ... Testing of Gypsum Board Per ASTM C 473— ROBKRT F- ACKKR Gypsum Analysis with the Polarizing Microscope— OFOROF W f.RF.FN 22 The Effect of Sorhed Water on the Determination of Phase Composition of ... TIIRK AND I.ARBI BOUNINI 48 A Simple Apparatus for Measurement of the Hydration Ratio of Plasters and Plaster Rocks—ETIESNK KARMA/SIN 52 Determination of Sulfur Trioxide in Gypsum—s, GOSWAMI AND...

Ngày tải lên: 02/04/2014, 15:41

... Bielanski and Jerzy Haber 44 The Chemistry and Technology of Petroleum: Second Edition, Revised and Expanded, James G Speight 45 Industrial Drying Equipment: Selection and Application, C M van't Land ... The Chemistry and Technology of Petroleum: Third Edition, Revised and Expanded, James G Speight 77 Synthetic Lubricants and High-Performance Functional Fluids: Second Edition, Revised and Expanded, ... of the Bible were written, the use of petroleum and bitumen was established Nevertheless, these writings offer documented examples of the use of petroleum and related materials The caulking of...

Ngày tải lên: 02/04/2014, 16:09

... University of Utah, an adjunct professor of chemistry and visiting professor, University of Trinidad and Tobago, and a visiting professor at the Technical University of Denmark (Lyngby, Denmark) Dr Speight ... left off, as professor of General and Applied Chemistry at Yale (this time, with a degree in the subject) After writing a number of chemistry books and being elected to the National Academy of ... Bielanski and Jerzy Haber 44 The Chemistry and Technology of Petroleum: Second Edition, Revised and Expanded, James G Speight 45 Industrial Drying Equipment: Selection and Application, C M vant Land...

Ngày tải lên: 02/04/2014, 16:09