Browsing by Subject "Analytic"
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Item A method of classification by geometric characteristics of certain equations in N variables through the use of extended analytic geometry(Texas Tech University, 1963-06) Ratliff, Michael PhilipNot availableItem Advannces in ion chromatograpy for environmental applications(Texas Tech University, 2003-08) Al-Horr, Rida SadekIon chromatography (IC) is a widely used analytical tool for the determination of many ionic species. Applications of ion chromatography extend over a wide range of chemical analyses. Introduction of eluent suppression in the mid-1970s extended the boundaries of conductometric detection into trace analysis. Current state-of-the-art IC systems require only water to operate, exhibit excellent reliabilities, and provide the ability of sample preconcentration and simultaneous multiple ion measurement, making them attractive for atmospheric analysis. Atmospheric particulate matter (PM) contains many inorganic and organic soluble ions. A number of those are weak acid anions that are largely undetectable in suppressed ion chromatography. An improved method that uses sequential suppressed and unsuppressed IC for the sensitive detection of both common anions and very weak acid anions has been investigated. After suppressed conductometric detection, the effluent is passed into a membrane device where KOH is passively introduced into the eluent stream using Donnan forbidden leakage. High temporal resolution measurement of atmospheric gases and constituents of atmospheric particulate matter (PM) is important to understand the chemistry and sources of atmospheric pollution. New continuous collection devices coupled with IC systems for fully automated measurement of soluble inorganic gases and soluble ionic constituents of atmospheric PM have been developed. Soluble gas collection is accomplished with a parallel plate wet denuder (PPWD). For particle collection, an automated alternating filter-based system was initially developed. This system uses two glass-fiber filters that alternate between sampling, and washing and drying. More recently, a continuous soluble particle collector (PC) of simpler design has been developed; this device does not use steam. Preceded by a denuder and interfaced with an ion chromatograph, this compact collector permits automated collection and continuous extraction of soluble anions and ammonium ion in atmospheric particulate matter. The systems have been deployed in a number of major field studies held in urban and suburban locations in the United States.Item Algebraic theorems obtained by use of extended analytic geometry(Texas Tech University, 1955-08) Garner, J.H.Te understand the theorems presented here one must first understand the basic principles which have been developed by Dr. Ralph Underwood. The basic process is a method by which equations with three or more variables may be represented on the XY plane. While the process does not represent a true projection many of the basic features of the loci, in the case of three variables, are preserved. The two basic methods which have been used previously are called System A and System B, (9:527) however, an infinity of methods or plotting rules are available. In the first ten theorems presented here a more flexible method is employed. In graphing the locus of the equation a point on the locus is first found, and the equation of a tangent hyperplane is written by the method illustrated below« one then may use a graphing rule so that the locus of the tangent hyperplane is a straight line on the XY plane.Item Conformational analysis of dioxanes and dioxolanes(Texas Tech University, 1972-12) Moore, AnaNot availableItem Loci of functions of three and four variables(Texas Tech University, 1950-08) Miculka, Vladik ANot availableItem Loci of functions of three and four variables on orthogonal axes(Texas Tech University, 1952-05) Strandtmann, Mary Ruth ChanceNot availableItem Loss of calcium and magnesium in the classical methods of analysis(Texas Tech University, 1950-08) Nabors, Lester GordonNot availableItem Multiplicative and dynamical analysis on idèles and idèle class groups(2016-05) Hughes, Adam Miles; Vaaler, Jeffrey D.; Ciperiani, Mirela, 1976-; Mohammadi, Amir; Allcock, Daniel; Sinclair, Christopher; Widmer, MartinWe prove an extension of a result due to Allcock and Vaaler from 2009. In the main theorem we show that an idèle group associated to Q-bar is naturally dense in a Banach algebra normed by the Weil height. We establish bounds for the dynamics of generic idèlic points of a field modulo the diagonally-embedded multiplicative groups of the associated fields.Item OATS, CAT, and CARDS : financial regulation in the era of big data(2015-05) Moore, Peter Austin; Flamm, Kenneth, 1951-; Von Hippel, PaulThe explosion of data in the financial industry has led regulators to seek better ways to utilize big data analytics. This paper analyzes the inception and development of three major regulatory programs borne from market failures. These programs represent the promise of big data, but have had to withstand criticisms of their cost, effectiveness, and necessity. The focus is on the twin goals of these programs: to reconstruct the market and to detect market abuse; and how the promises have been met and criticisms have been replied to.Item Potential energy function development and dynamics of energy transfer and fragmentation for collisions of protonated peptide ions with organic surfaces(2007-12) Deb, Bipasha; Hase, William L.; Gellene, GregThe study of ion-surface collisions has been a subject of interest for the past few years. There are a number of processes observed for these type of collision depending on the translational energy. Projectile ions, with translational energies in the range of 1- 100 eV, adhere when they collide with organic surfaces. This is called soft-landing and by colliding biological molecules with surfaces, this property has been used to prepare microarrays. Chemical dynamics simulations give near quantitative energy transfer probabilities for projectile ion collisions with surfaces as compared to experimental results, and there is substantial interest to extend this work to soft-landing. However, to model these experiments it is necessary to have accurate short-range and long-range potentials for the projectile-surface interaction. The former controls the collisional energy transfer and the latter forms the gas-surface attraction. Developing the combined short-range and long-range potentials is one focus of this work. Potentials for the CH4-CH3NH3+ interaction were calculated at the MP2/aug-ccpVTZ level of theory, with a basis set superposition error (BSSE) correction included, and fit with novel models for atom-atom two-body interactions. Another process observed during ion-surface collisions is surface-induced dissociation (SID). The study of the SID of singly protonated octaglycine was done by perfoming direct dynamics trajectory simulations. The protonated octapeptide was allowed to collide with a diamond{111} surface and the trajectory simulations were performed using the VENUS/GAUSSIAN chemical dynamics package. These QM+MM direct dynamics simulations were carried out using the AM1 semi-empirical QM model for the intramolecular potential of the peptide ion. The simulations were performed for a collision energy of 100 eV and a collision angle of both 00 (normal to the surface) and 450. The energy transfer efficiencies were determined and compared with the experimental results of protonated des-arg-bradykinin which is also an octapeptide. The mechanism of fragmentation of the peptide ion was also studied and it was observed that a significant fraction occur via shattering as expected from experiments. The results are also compared with previous direct dynamics simulations of peptide-H+ SID.Item