Digital Commons Network^™

Separations Via Semicontinuous Parametric Pumping, Edward H. Reiss

Theses

A semicontinuous parametric pump with batch operation during one half-cycle and continuous operation in the other half-cycle was experimentally investigated in the model system, toluene-n-heptane on silica gel adsorbent. Comparison was made with analytical results obtained by the equilibrium theory. It was shown that when the penetration distance for the cold cycle was less than or equal to that of the hot cycle and the height of the column, the rate of production of pure solvent in the semicontinuous pump may become quite large relative to that in the continuous pump.

Computer Simulation Of A Linde "Double Column", John A. Bazan

Theses

The purpose of this thesis is to develop a Fortran Computer Program to simulate the operation of a Linde "Double Column" for the separation of air into oxygen and nitrogen. The model outputs the number of contact stages required, the reflux ratio, the heat loads (condenser and reboiler, and the five profiles of temperature, pressure, vapor flow rate, liquid flow rate, and light component composition. From this data, the proposed design can be evaluated, and the effect of varying operating conditions explored.

A Method Of Schlieren Alignment Stabilization Using Automatic Feedback Control, W. Lawton King

Theses

An investigation of the application of feedback control to schlieren system alignment stabilization is presented. A feedback control system was designed with the necessary sensors and actuator to maintain the knife edge alignment of a schlieren system. The feedback control system's performance when subjected to controlled disturbances was evaluated. The results indicated that the approach is feasible.

The Effect Of Chromatic Aberration In Process Lenses On The Copying Of Reflection Halftone Dots, Burdette A. Saunders

Theses

A method for evaluation of copydot quality is determined. This method is applied to the problem of determining the relative copydot quality of two films of different spectral sensitivities, while using two process lenses with measureable amounts of chromatic aberration.

Image Spread Characteristics Of Vesicular Films, Ira Long, Alan Turner

Theses

An altered Bausch and Lomb metallograph, in conjunction with a 150 watt high-pressure Xenon-arc lamp, was used to image 50µm uniformly illuminated round spots on several vesicular emulsions and a silver emulsion to determine image spread characteristics with increasing exposure times. Vesicular films tested include Kalvar Types 16, 143, 163, and 164, a sample of Xidex Blue and a high resolution aerial film. It was found in all cases that image spread was more profound in vesicular films than in the silver film tested. It was also found that ten minute and twenty minute periods of time between exposure and …

The Reaction Of P-Nitrophenyl Acetate With Lysine Hydrochloride And Poly-1-Lysine Hydrobromide, Emmanuel Plange Matteer

Theses

The reactions of p-nitrophenylacetate with L-lysine hydrochloride and poly-L-lysine hydrobromide as a function of pH were investigated.

The results indicate that both compounds react with the substrate in the pH range 7.0-10.0 with an apparent optimum pH in the region near 9.65.

Poly-L-lysine reacts more rapidly over the entire pH range investigated than does L-lysine.

A Study Of The Optimization Of Ethylene Production In A Tubular Reactor, Richard W. J. Robertson

Theses

The pyrolysis of ethane is a complex reaction involving six individual reactions in a reactant mixture of thirteen components. It is further complicated by the deposition of carbon along the reactor walls. The carbon buildup eventually necessitates reactor shutdown, During the intermediate stages the reactor experiences a gradual increase in inlet pressure which affects the reaction conditions, Optimum temperature profiles exist because the yield goes up with increasing temperature, but, consequently, the reactor must be shut down and cleaned out with increasing frequency. The combined effect causes the yearly production of ethylene to go through an optimum.

To find this …

The Creep And Stress Relaxation Behavior Of Silver Bearing Copper Wire, Alfred Fox

Theses

Creep and stress-relaxation experiments were performed on silverless and silver bearing copper in the temperature range 73F to 250F. The creep experiments were conducted at constant load and temperature, the stress-relaxation tests at constant total strain and temperature for a total time period of 1000 hours. The effect of silver addition of up to 0.2 percent w/o (60oz per ton) on the creep and stress-relaxation behavior of spectrographically pure copper (99.999+ Cu) as well as on that of tough pitch and oxygen free coppers of lesser purity was studied. Spectrographically pure copper was found to be much more susceptible to …

Calibration Of A Photometric Standard For Hard Dot Area Measurement, Steven K. Misar

Theses

Discussed are the specifications for a Photometric Standard of Hard Dot Area. Mathematical approximations have determined the desired pattern and frequency to be; cross hatch and 100 lines/in. respectively. When measuring the Photometric Standard, deviation from the actual area is attributed to micromotion in the aperture and diffraction in the Densichron 3885d (Sargent - Welch Scientific Co.). The desired specifications in the Photometric Standard allow precise measurements of ± 5% area. A Hard Dot Area Meter was designed and constructed, which simulates a photometric method that theoretically eliminates deviation from the actual area measured. It was statistically tested against microscopic …

Plastics In Art, Patricia Hincks

Theses

None provided.

The Development Of Langmuir's Adsorption Isotherms For Glucose And Fructose And The Separation Via Continuous Parametric Pumping, Jafir Abbas Jaferi

Theses

The adsorption equilibria and adsorption rates of fructose and of glucose on aqueous suspensions of fullers earth were determined at various temperatures. The Langmuir adsorption equations were fitted to the equilibrium data and the Langmuir constants were determined so that isotherms could be developed for any pair of parametric pumping operating temperatures.

This glucose+fructose+water system was then subjected to continuous thermal parametric pumping for the separation of glucose and fructose. The operating conditions required for the separation were determined from the experimental adsorption rates and equilibrium isotherms. Samples taken from the continuous top and bottom streams were analyzed by polarimetry …

Flow Behavior Of Molten Polymer Blends, Kryspin Pawel Maciejewski

Theses

An experimental study of molten polymer blends was made using the Instron Capillary Rheometer. The materials investigated were two phase blends of non-crystalline polymers (poIymethylmethacrystate-low Mw-polyvinylacetate, polyvinylacetate-polystyrene, polymethylmethacrylate-low Mw-polystyrene, polymethylmethacrylate-high Mw-polystyrene), crystalline polymers (polyethylene-polypropylene) and combinations of non-crystalline-crystalline polymers (polyethylene-polystyrene). Two methods of sample preparation were used, blending of a polymer pair in a molten state by the use of Brabender blender, and a simple manual blending of pellets in desired proportion. The Brabender blended polymer pairs show lower viscosities, this is interpreted molecularly as a result of a reduction of the amount of chain entanglement on shearing of the …

Pulse-Width-Modulation Control For Second Order Plants Via A Quadratic Criterion, Charles Gebo

Theses

This paper presents a mathematical study of the control of a second order plant having real distinct roots by use of pulse -width-modulation. An integrator connected between the pulse-width-modulator and the plant is a fixed element of the control loop. The integral-square error is used as the Index of performance. The ISE is minimized with the constraint that the pulse modulator is limited to a maximum of one output reversal for a step change in input. Derivation of the equation which will predict the exact switching time of the modulator output to minimize the performance index for any step amplitude …

Digital Executive Control Of A Hybrid Computing System, Glenn Kauffman

Theses

This is a paper describing an interface system integrating an HP 2116B digital computer and an EAI TR-48' analog computer. The interface system provides the digital computer with the capability to control the analog computer operational modes, to read the output signals on the analog computer amplifiers and coefficient settings of the potentiometers, and to control and sense numerous interface trunks.

Agitation Of Dilatant Fluids, Vijay Jang Datta

Theses

No abstract provided.

A Simulation Model Capable Of Performing The Calculations Involved In Defining A Crude Preheat Train, Robert G. Parker

Theses

A simulation model has been developed for a system of ex changers to preheat the feed to a crude distillation unit. In conjunction, a Fortran program for the performance of the model calculations by digital computer was written. Two types of preheat system were simulated, a single train system and a split (or parallel) train system. A number of features were included in the program for flexibility and versatility. A particular effort was made to have the model represent as economical a preheat system as possible.

The model program was used to obtain computer-calculated results for both single-train and split-train …

Computer Model For Reactor Design Of An Ethane Cracking Unit, Derek J. Lough

Theses

The purpose of this thesis is to develop a Fortran [sic] Computer Program to model the radiation section of a pyrolysis tube reactor designed for cracking 100 percent ethane feed. The model calculates the length of the tubular reactor required to obtain a specified ethane conversion or the ethane conversion for a specified reactor length. The resulting solution yields a conversion profile, a temperature profile, and the reactor residence time as a function of tube length. From this data it can be determined if the design is adequate and lies within the reactor model's constraints.

Design Of A Tactile Vocoder, Roger Carr

Theses

A tactile vocoder is designed for the feedback of acoustic cues for detection by the sense of touch. Design objectives based on speech signal properties are generated. An existing spectrum channel vocoder is the starting point of the design. The follow-on modulation stage after the filter channels of the spectrum channel vocoder is built up in a breadboard model and tested. The transfer function of the modulation stage has an input dynamic range of 68 decibels, being linear over 38 decibels of this range. The complete breadboard model using one of the filter channels has an input dynamic range of …

Computer Application Of Historical Data, Raymond Wright

Theses

None provided.

An Audio Oscillator Triggering Circuit For The Eg&G 501 High Speed Stroboscope; With Integrated Digital Timing, Boisey Collins

Theses

A timing generator was designed and built for an EG&G 501 High Speed Stroboscope. The generator delivers a burst of one, two, four or eight pulses at a selected repetition rate from .5HZ to 20KHZ; upon initiation by a start signal. An Unijunction Transistor ( UJT ) oscillator provides the basic repetition rate and Integrated Circuit ( IC ) Digital Logic is used to count and gate the output pulses. The circuit diagrams and construction details are given.

An Investigation Of The Aesthetic Quality Of Gloss As Produced By Overprint Varnishing, John Bechtel

Theses

The undertaking of this investigation was to question the aesthetic significance of overprint varnish. To do this a statistical investigation was developed to answer the question: "When the protection factor of overprint varnishing is of little or no significance, does overprint varnishing of the finished product add an element of aesthetic quality sufficient to justify the outlay of additional funds?" The philosophy of the investigation revolved around the investigative sample distinguishing the overprint varnishing process as a significant aesthestic enhancement process. To do this a sample of 15 sets of magazine quality reproductions, all printed under the same conditions, were …

A New Technique For Steady State And Transient Analyses Of Incompressible Flow Networks, George V. Catanzaro

Theses

A new technique for the calculation of the transient or the steady-state mass flow rate and pressure distribution in incompressible flow networks is presented. Employing the matrix method of network analysis, the nodal continuity and branch momentum equations are solved simultaneously to obtain explicit relations giving the unknown nodal pressures and branch mass flow rates. In this manner, the transient or the steady-state behavior of incompressible flow networks with arbitrary configuration having nodal sources and sinks as well as branch transducers can be determined. In contrast with the conventional steady-state network analysis methods, the new technique can be extended to …

Stability Analysis Of A Continuous Stirred Tank Reactor With An Autocatalytic Reaction, David Elliot Rosenberg

Theses

The basic principles of stability analysis are set forth, including the development of a mathematical model, steady state analysis, integration of the dynamic system equations, and predictions of transient responses. The equations for the mathematical model are developed for a continuous stirred tank reactor with a cooling jacket, containing an autocatalytic reaction, in unsteady state operation. These equations are numerically integrated to obtain a good picture of reactor dynamics about the steady state. State variable methods, including the classical linearization theorems and Lyapunov's Second Method, are utilized to predict bounds of stable reactor behavior. A discussion of the shortcomings of …

A Study Of Heat Transfer And Inlet Flow Behavior In Molten Polymer Systems, Min Ho Choi

Theses

Two separate studies have been done in the present work: one to study the entrance effects in flow in molten polymer systems and the other to investigate the heat transfer to thermally softened flowing polymer.

The equipment for the entrance effect was designed to study the isothermal flow behavior of a polymer melt in the entrance region. The main object of this investigation was to find the entrance length for the melt to relax and to separate the pressure drop into viscous and elastic effect. Due to the failure in developing a proper pressure measuring device the experiment was not …

Variations In Functional Relationships Between Amplitude And Phase Images, Gilbert Tunney

Theses

The objective of this research is to study the functional relationship between amplitude and phase images, using a sinusoidal test function. Amplitude and phase sine wave gratings were produced and scanned. It was found that the phase image closely reproduces the amplitude image for low spatial frequencies, but the accuracy of reproduction falls off at high spatial frequencies.

The Synthesis And Application Of Programmable Counters, James Milne

Theses

A method of synthesizing programmable counters is described. It is shown that if the values of the program inputs are not fixed by external requirements, they can be defined during the synthesis to tend to minimize the combinational logic of the programmable counter. A programmable counter can be used as the control unit in a word organized digital system. The cost effectiveness of synthesizing synchronous sequential machines modeled as word organized digital systems is discussed.

An Instrument For Rapid Determination Of Granularity In Photographic Film Samples, Melvin E. Pollard

Theses

A scanner based on the principle of the classic microdensitometer was assembled for the purpose of rapid granularity determination. A rotary stage was used to allow the generation of a root-mean-square (rms) voltage signal proportional to rms Transmittance in the sample. A mathematical relation was then developed to calculate granularity. The scanner was calibrated and was proved capable of 10 percent accuracy with 95 percent confidence.

Unsteady State Heat Transfer In A Composite Medium Exposed To Radiant Heat Energy, Ripujit Mackar

Theses

Transient one dimensional heat transfer in a composite medium of two materials exposed to radiant heat flux has been investigated. The end faces of the composite were considered to be losing heat energy by natural convection and radiation. The principle variables studied were the temperature at steady state and the time required to attain the steady state with and without the contribution of loss by radiation. It was observed that neglecting the loss of energy by radiation from the face receiving the radiant heat flux introduced an error in the absolute steady state temperature of that face as high as …

The Stunting Of Creative And Mental Growth; Or, The Evolution And Pollution Of Ideas, Nelson Dodson

Theses

None provided.

An Individual Analysis Of The Photography-Painting Relationship, Lawrence White

Theses

None provided.