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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
431

Thermodynamics of the Abraham General Solvation Model: Solubility and Partition Aspects

Stovall, Dawn Michele 08 1900 (has links)
Experimental mole fraction solubilities of several carboxylic acids (2-methoxybenzoic acid, 4-methoxybenzoic acid, 4-nitrobenzoic acid, 4-chloro-3-nitrobenzoic acid, 2-chloro-5-nitrobenzoic acid,2-methylbenzoic acid and ibuprofen) and 9-fluorenone, thianthrene and xanthene were measured in a wide range of solvents of varying polarity and hydrogen-bonding characteristics. Results of these measurements were used to calculate gas-to-organic solvent and water-to-organic solvent solubility ratios, which were then substituted into known Abraham process partitioning correlations. The molecular solute descriptors that were obtained as the result of these computations described the measured solubility data to within an average absolute deviation of 0.2 log units. The calculated solute descriptors also enable one to estimate many chemically, biologically and pharmaceutically important properties for the ten solutes studied using published mathematical correlations.
432

Efficient Irrigation for Recreational Turfgrass in New England: Evapotranspiration and Crop Coefficients

Poro, James W 18 March 2015 (has links)
As water demand increases it will become more imperative for golf course superintendents, landscape managers, and other industry professionals to improve water use efficiency in the management of recreational turfgrass. Scheduling irrigation according to actual turfgrass evapotranspiration rates (ETT) is an integral component of efficient irrigation practices. Impracticality of field derived ETT for industry use, however, directs the need of weather station derived reference (predicted) evapotranspiration (ET0). To accurately predict (estimate) ETT of turf and other crops, scientifically derived landscape (crop) coefficients (Kc values) are used in conjunction with mathematical models that incorporate local meteorological data. Research is limited, however, in identifying Kc values and subsequent ET0 for turfgrass species selected and maintained under high intensity recreational practices congruent of golf courses and sports fields in the cool-humid northeast climate. Therefore, objectives of this study were to (i) observe and record ETT of three commonly selected recreational turfgrass species; 'Exacta' Perennial ryegrass (Lollium perenne L.), 'Touchdown' Kentucky bluegrass (Poa pratensis L.), and 'Memorial' Creeping bentgrass (Agrostis stolinifera L.) maintained as golf and sports turf, (ii) analyze the impact various management practices (nitrogen fertility and height of cut) have on ETT, (iii) develop accurate Kc values appropriate for use with the recommended FAO 56 Penman-Monteith mathematical model for accurate ET0 of recreational turf maintained in the cool-humid northeast. Four heights of cut (HOC) and two nitrogen fertility rates (N) were evaluated to determine their impact on turfgrass growth and subsequent water use and ETT of three recreational turfgrass species. Golf turf (creeping bentgrass) maintained at a lower height of cut than sports turf exhibited a smaller leaf area component and a significantly lower (20%) ETT. N applied as slow release (82%) throughout the growing season increased ETT by 5%, particularly with perennial ryegrass sports turf. Taller HOC also increased ETT by 10% due to increased leaf area indices and subsequent decreased resistance to ET. Predicted ET0 according to FAO 56 for all three years of the study (79 observations) captured 71% of ETT. Yearly and monthly calculations suggest less variable (cloudy) weather yielded more accurate ET0. Crop coefficient (Kc) values established in conjunction with FAO 56 ET0 ranged from 0.90 to 1.00 for shorter golf course turf (creeping bentgrass), and 1.15 to 1.25 for taller sports turf (Kentucky bluegrass and perennial ryegrass). Results indicate shorter grass exhibits a lower ETT than taller grass due to various factors, and in the case of industry application, FAO 56 ET0 can accurately estimate ETT of recreational turf in the cool-humid northeast when fitted with appropriate Kc values.
433

Digitální hudební efekt založený na waveletové transformaci jako plug-in modul / Digital musical effect as a plug-in module based on wavelet transform

Konczi, Róbert January 2011 (has links)
This work deals with theory of wavelet transform and Mallat’s algorithm. It also includes the programming method of creating VST plug-in modules and describes the developement of the plug-in module, witch uses the modificated coeficients of wavelet transform to applicate the music effect.
434

Ztráty v potrubí průtokem směsných substrátů. / Losses in a pipe line because of the flow of mixed substratums

Vlasák, Bohdan January 2009 (has links)
Introductory part of this thesis is aimed on theoretical description, principle and building of biogas stations, which require solution of many different problems. A specific group of the problems concern transport of mixed substrates of different concentrations both in and outside the area of biogas station. A major part of the substrate transport is done by pumping it in pressure pipeline. Experimental work consists of design and description of a measuring circuit. Graphic characteristics for water and gas loss levels are drawn from the measured readings. Multiples of pressure losses by flowage of substrates with different levels of dry basis are graphically expressed with a help of correction coefficients.
435

Zvláštní vlivy působící na cenu nemovitostí / Special influences affecting the price of real estate

Kulil, Vladimír Unknown Date (has links)
The subject matter of this dissertation thesis is a proposal for a method of valuation of special effects that with impact on real estate prices. It deals with proposed procedures for valuation of intangible assets, and definitions of such property. Special effects are in particular name, historical value, design, quality of layout, security aspects, accessibility, conflictful groups of inhabitants in or near the property, and location. The value of special effects can be calculated as the difference between usual value and the material value of such property without coefficients of merchantability. For appraisal by official price, the thesis suggests to amend certain provisions and sections of the Act on Property Valuation No. 151/1997 Coll., and the implementing regulation of this Act, as amended. Part of the methodology is a general proposal for a method how to divide the assets into tangible and intangible part. As concerns the concrete procedure when calculating real estate prices, the thesis specifies procedure for special effects valuation. A form of cumulative matrix comprising all such effects has been drafted. Prices in single methodologies for assets valuation has to be adjusted by reasonable quantity of impact. For real estate on the territory of the Czech Republic will be used also coefficients of merchantability Kp in accordance with the price regulation considering their development in historical statistics.
436

Numerical Investigation on Spherical Harmonic Synthesis and Analysis

Bärlund, Johnny January 2015 (has links)
In this thesis work the accuracy of the spherical harmonic synthesis and analysis are investigated, by simulated numerical studies.The main idea is to investigate the loss of accuracy, in the geopotential coeffcients, by the following testing method. We start with a synthesis calculation, using the coefficients(EGM2008), to calculate geoid heights on a regular grid. Those geoid heights are then used in an analysis calculation to obtain a new set of coeffcients, which are in turn used to derive a new set of geoid heights. The difference between those two sets of geoid heights will be analyzed to assess the accuracy of the synthesis and analysis calculations.The tests will be conducted with both point-values and area-means in the blocks in the grid. The area-means are constructed in some different ways and will also be compared to the mean value from 10000 point values as separate tests. Numerical results from this investigation show there are signifi…cant systematic errors in the geoid heights computed by spherical harmonic synthesis and analysis, sometimes reaching as high as several meters. Those big errors are most common at the polar regions and at the mid-latitude regions.
437

Invariants of Polynomials Modulo Frobenius Powers

Drescher, Chelsea 05 1900 (has links)
Rational Catalan combinatorics connects various Catalan numbers to the representation theory of rational Cherednik algebras for Coxeter and complex reflection groups. Lewis, Reiner, and Stanton seek a theory of rational Catalan combinatorics for the general linear group over a finite field. The finite general linear group is a modular reflection group that behaves like a finite Coxeter group. They conjecture a Hilbert series for a space of invariants under the action of this group using (q,t)-binomial coefficients. They consider the finite general linear group acting on the quotient of a polynomial ring by iterated powers of the irrelevant ideal under the Frobenius map. Often conjectures about reflection groups are solved by considering the local case of a group fixing one hyperplane and then extending via the theory of hyperplane arrangements to the full group. The Lewis, Reiner and Stanton conjecture had not previously been formulated for groups fixing a hyperplane. We formulate and prove their conjecture in this local case.
438

Breakdown Characteristics in SiC and Improvement of PiN Diodes toward Ultrahigh-Voltage Applications / 超高耐圧応用を目指したSiCにおける絶縁破壊特性の基礎研究およびPiNダイオードの高性能化

Niwa, Hiroki 23 March 2016 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第19722号 / 工博第4177号 / 新制||工||1644(附属図書館) / 32758 / 京都大学大学院工学研究科電子工学専攻 / (主査)教授 木本 恒暢, 教授 髙岡 義寛, 教授 山田 啓文 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM
439

A Comprehensive Study of Diffusion and Modulus of Binary Systems within the Ti-Mo-Nb-Ta-Zr System

Chen, Zhangqi 10 October 2019 (has links)
No description available.
440

Vapor-Reacted Diffusion Multiples for Efficient Study of Phase Equilibria and Interdiffusion

Eastman, Christopher Michael, Jr. 23 October 2019 (has links)
No description available.

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