Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 28 for “"alkalis"”.
-
NANOSTRUCTURED MATERIALS FOR ALKALIS ION BATTERIES AND THEIR MECHANISTIC STUDIES
To be comparable with combustion engine and practical for large-scale applications in smart grids, the energy density and the rate capability of LIBs and SIBs must be improved, which urges the exploitation of novel composite cathode or anode materials high specific capacity, high rate capability, …
-
Outer-core emission spectroscopy of the heavy alkalis and alkali-alkali metal alloys
… both as pure metals and as impurities in other alkalis, increases strongly with the observed emission band width. A dependence of the Auger matrix element on band width is the likely cause."
-
Surface reflectance core spectroscopy of halogens, rare gases, alkalis and CO on metal surfaces
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-28T15:03:36Z No. of bitstreams: 1 1980_cunningham.pdf: 5039429 bytes, checksum: 6a907df332d48a6816d0e9530d260918 (MD5)
-
Surface Reflectance Core Spectroscopy of Halogens, Rare Gases, Alkalis and Carbon-Monoxide on Metal Surfaces
… spectra for the halogens, rare gases, alkalis and the CO molecule adsorbed on metal and insulating surfaces are described. This research employed synchrotron radiation in the energy range from 4 to 20 eV, using both s and p polarized light. Results for adsorbates in three neighboring …
-
The Effect of Composition on the Alkali-Silica Mitigation Potential of Fly Ash-Ground Glass Blends in Concrete
… reaction between select reactive aggregates and alkalis in the pore solution of concrete added by the hydration of portland cement. The inclusion of fly ash and waste glass has potential to reduce the deleterious expansive effect of ASR. Testing conducted involves measurement of length change, …
-
Molecular dynamics calculation of mean square displacement in alkali metals and rare gas solids and comparison with lattice dynamics
… to rare gas solids. The computations for the alkalis were done for several temperatures for temperature vol ume a swell as for the the ze r 0 pressure ze ro zero pressure volume corresponding to each temperature. In the fcc case, results were obtained for a wide range of both the temperature …
-
Magic Trapping of a Three-Level System for Rydberg Quantum Computation
… calculations show that, while the commonly used alkalis cannot be trapped with this scheme, a "magic" trap could be built for aluminum.
-
Durability of Silane Sealer in a Highly Alkaline Environment
… minerals present in certain aggregates and alkalis in the concrete pore solution. The reaction can lead to expansion and severe damage in concrete members. One method to mitigate ASR expansion is to use a penetrating sealer such as silane. A set of columns located in a food preparation …
-
Characterisation and refinement of properties of glass fibre reinforced polyester polymer concrete for use in manhole components
… the materials resistance to UV radiation, acids, alkalis, and various solvents. Different resins were evaluated, and experiments were conducted using graded aggregates, in an attempt to reduce the number of voids in the material. Vibratory moulding techniques and postcuring methods were also …
-
Petrogenesis and evolution of alkalic basaltic magmas in a continental intraplate setting: the South Auckland Volcanic Field, New Zealand
… A basalts are distinguished by their low total alkalis (3.0 - 4.8 wt.%), Nb (9 - 29 ppm) and Zr (97 - 210 ppm) abundances, and low (La/Yb)N (3.4- 7.6), which contrast with group B that have large total alkalis (3.3 - 7.9 wt.%), Nb (35 - 102 ppm) and Zr (194 - 491 ppm), and (La/Yb)N (12 - 47). …
-
The role of volatile species in the softening of blast furnace burden.
… the more viscous liquid oxide mixtures formed. Alkalis play a less important role in the chemistry of softening in the blast furnace and they may delay softening at low oxygen potentials.
-
Mitigating alkali silica reaction in recycled concrete
… and TGA revealed that calcium hydroxide and alkalis are reduced by fly ash, silica fume and GGBFS substitution. Calcium depletion during the pozzolanic reaction is a sufficient condition for ASR arrest, but the alkali reducing effect appears to be more pivotal than calcium …
-
Differentiation in impact melt sheets as a mechanism to produce evolved magmas on Mars
… rocks observed in Gale crater are enriched in alkalis (up to 14 wt% Na<sub>2</sub>O + K<sub>2</sub>O) and silica (up to 67 wt% SiO<sub>2</sub>) with low (< 5wt%) MgO. This alkaline differentiation trend has previously been attributed to fractional crystallization of magmas resulting from …
-
The control of alkali silica reaction using blended cements
… the rate and extent of ASR. The release of alkalis into solution by Portland cements of various alkali content was studied by analysis of pore solution samples expressed from mature specimens. The specification for avoiding ASR by alkali limitation, both by alkali content of cement and the …
-
A Comprehensive Study and Mechanism Investigation for Alkaline-Heavy Oil Recovery Process
… embodied by its chemical reaction required by alkalis to react with oil acids. Consequently, in-situ surfactants are generated for various emulsification phenomenon. It is known that alkaline flooding performance in oil recovery is subjected to the emulsion type generation, thus, of great …
-
Petrology of the Cenozoic phonolites and related rocks of the Houston Creek area, Bear Lodge Mountains, Wyoming
… are sodic in character and are higher in total alkalis and lower in s10 2 than trachyte porphyry. Chemical and petrographic trends indicate that these rocks resemble those of a typical alkali olivine basalt series and that the primary magma was phonolitic in composition. Granitic xenoliths, …
-
Petrological and geochemical study of spilites and associated dike rocks from the Virgin Island core (Caribbean Island arc)
… than the bottom of the flow. Local variations of alkalis show also that the dark patches are higher in Na20 than the surrounding green matrices. The alkali migration throughout the different lithological units of the core could have been caused by both magmatic and metamorphic processes. During …
-
Alkali Silica Reaction Mitigation Using High Volume Class C Fly Ash
… and analyzing fly ashes by a ratio of sum of alkalis: sum of oxides instead of simply classifying a fly ash based upon sum of oxides.</p>
-
Characterization, Evaluation, And Repair of Full-Scale Alkali-Silica Reaction Affected Structural Concrete
… siliceous minerals in some aggregates and alkalis in the concrete pore solution, can produce an expansive gel that, in the presence of sufficient moisture, leads to expansion and cracking. This not only decreases mechanical properties but also increases permeability and, as a result, …
-
The relation of soil characteristics and chemical constituents of soil solutions to the self corrosion of underground lead cable
… holds this as a very important factor. Alkalis, as well as acids, have detrimental corrosive effects on lead cable. This was shown very decisively in this study, and for these reasons, it is thought a bad policy to place non-protected cable in the vicinity of calcareous substances, such …
Page 1 of 2