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Showing 1 to 20 of 36 for “"Chemical System"”.
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The oscillogenic instrument
A generalized chemical oscillator has been invented consisting of input and output interfaces to a chemical system, with the appropriate feedback external to the chemical system such that the system oscillates. The oscillation frequency can be made a function of concentration, reaction kinetics, …
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Development of multicomponent coupled-cluster theory and its application to nanoclusters and molecular systems
… that describes all electrons and nuclei in a chemical system. This is accomplished by assuming that the motion of nuclei and electrons are vastly different; the motion of the two particle types is decoupled. While the BO approximation is ubiquitous in computational and theoretical studies, it …
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Ab-initio and thermodynamic study of 123I-MIBG and 76Br-MBBG : choosing an effective tracer and theoretical study of the binding mechanism of 1-allyl 2-Thiourea as a functional monomer of Methyl Nitrate template
… reaction energetics, and thermochemistry of chemical reactions is possible computationally. This is because computational methods are well able to help understand and also describe the dynamics of chemical bonding -- forming and breaking of chemical bonds. Hence, it becomes very important to …
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Nonlinear oscillation and control in the BZ chemical reaction.
… reaction in a closed isothermal chemical system. The reaction zone can be divided into two zones, oscillation zone and transition zone, where the oscillation time and the transition time and the number of the complete oscillations are estimated. By applying the geometric singular …
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The study of bimolecular radical reactions using a novel time-resolved photoionization time-of-flight mass spectrometry and laser absorption spectrometry apparatus
… kinetics and the product distributions of these systems. The apparatus uses laser absorption spectrometry to probe a radical of interest and thus measure its transient concentration quasi-continuously to precisely determine the kinetics of the reaction. At the same time, the apparatus samples the …
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Polarization, passivation, intercalation, and generation: an examination of In-Situ and Ex-Situ analytical techniques for the study of carbon anode materials for the electrochemical generation of elemental fluorine.
… for their use as electrodes in the electrochemical generation of elemental fluorine. An experimental apparatus was designed and constructed to melt and maintain the temperature of the KF·2HF electrolyte in a suitable range for electrochemical measurements. An electrochemical cell was …
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Optimal Control of a Reactive Stagnation Point Flow on a Catalytic Plate
Chemical reactions on catalytic surfaces are a very active and intense research area. In many cases the transport of the chemical species to and from the catalyst is also important. Therefore it is necessary to couple the equations for the surface reactions with the equations of the flow field. One …
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Stochastic processes in biological systems : selected problems
… of stochastic fluctuation in networks of chemical reactions that are meant to represent biological networks in the coarse-grained way. We show that specific network structure can have profound consequences on the steady-state probability distribution function of corresponding chemical …
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Investigations of cloud altering effects of atmospheric aerosols using a new mixed Eulerian-Lagrangian aerosol model
… inorganics and insoluble cores; the specific chemical system to be considered is specified by the user in text input files. Aerosol particles may be represented using "sectional distributions" or using a "representative sample" distribution which tracks individual particles.
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A master equation approach to nonlinear optics and chemical reactions
… concentration fluctuations and correlations in chemically reacting systems, using the stochastic master equation approach. The time dependent fluctuations and spatial correlations are discussed for a space dependent model of a linear chemically reacting system. These results are compared with …
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Specific ion effects on transient polymers: a new strategy for programmable microcapusles
… self-regulating reaction networks in autonomous chemical system.
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Untersuchungen zur Hochtemperaturchemie quecksilberfreier Metallhalogenid-Entladungslampen mit keramischem Brenner
… the sunlight. While evaporating, several chemical reactions occur among the inserted metal halides. Thus infecting the properties of light generation in a metal halide lamp. Further a corrosion attack on the burner vessel is observed due to chemical reactions of metal halides with the wall …
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Reconciling the structural and metamorphic record of orogeny in central western New Hampshire through microstructure and garnet isopleth thermobarometry
… calculating the changes in composition of the chemical system from which garnet is growing that are caused by crystal fractionation of garnet. This section has been published in The Journal of Metamorphic Geology (Evans, 2004), and is presented here unchanged. Section C utilises the methods …
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Heat transfer coefficients of particulate in tubular heat exchangers
… heat source for various thermal power and thermochemical cycles. Furthermore, one of the advantages of this concept is the ability to store thermal energy in the solid particles at relatively low cost. However, an important feature of any Particle Heat Receiver (PHR) system is the PFHX, which is …
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Scale-Up of the Semi-Continuous Chromatographic Process
… and output streams around a closed symmetrical system of twelve, fixed 7.6 om-diameter columns. Mechanical movement, save the automatically timed opening and closing of proven reliability solenoid valves, has thus been eliminated. The chemical system chosen for the study of the operating …
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Chemical Modification on Gold Slides to Gain Better Control of Patterning Techniques
… surfaces with defined regions of different chemical functionality. In our previous project optimum conditions for lithographic patterning were determined and potential blockers were identified to reduce force on the tip.</p> <p>This work is focused on identifying good chemical modifications …
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Advanced Electrochemical Analysis for Complex Electrode Applications
… situations that may be encountered in electrochemical studies. Three main situations have been examined, they include the formation of polymer films on electrode surfaces during measurements, a novel nanocatalyst modified electrode surfaces, and organised carbon nanotube (CNT) structures on …
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C.A.R.S. temperature measurements and chemical kinetic modelling of autoignition in a methanol-fuelled internal combustion engine
… conditions, are then used as input data for chemical kinetic modelling of end-gas autoignition. Five published mechanisms (Grotheer et al 1992, Grotheer and Kelm 1989, Norton and Dryer 1989, Dove and Warnatz 1983, .and Esser and Warnatz 1987) are used in the autoignition study, and the …
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Stability and robust behaviour across classes of biological and chemical models
… of the theory of continuous autonomous dynamical systems. The focus of the thesis is on qualitative, as opposed to numerical, analysis. The applications examined are biological and chemical, and as such there are signi�cant uncertainties in any mathematical representation of them. While the …
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