177,650 research outputs found
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Intern experience at CH���M Hill, Inc.: an internship report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesA review of the author's internship experience with CH���M HILL, Inc.
during the period September 1975 through May 1976 is presented. During this nine month
internship the author worked as an Engineer II in the Industrial Processes discipline of this
large consulting engineering firm... The author's prime responsibility was as one of three
lead design engineers on the design of a large wastewater treatment facility for a pulp mill
in Hoquiam, Washington owned by ITT Rayonier Inc. The work generally consisted of the design
of individual treatment units and associated piping and pumping. The purpose of the project
was to provide wastewater treatment capabilities that would satisfy the effluent limitations
(standards) imposed upon the mill by the State of Washington Department of Ecology and the
U.S. Environmental Protection Agency. The author's assignment also entailed necessary
interaction with the project manager and other CH���M HILL design engineers and support staff
members, the client's representatives, and representatives of two other consulting engineering
firms working on the project. Thus, the internship position at CH���M HILL provided considerable
experience coordinating the author's work with the work of other engineers, guiding the design
and administrative efforts of a support staff, and interacting regularly with the client and
other consulting firms. This broad exposure to a variety of engineering and organizational
problems provided a valuable educational experience
An extension of Pedersen's viscosity model for saturated black oil systems
No full textDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Includes bibliographical references (leaves 61-64).Issued also on microfiche from Lange Micrographics.This thesis presents a modification of Pedersen's corresponding states compositional viscosity model for black oil systems when no compositional data are available. This new model provides better estimates for oil viscosity than previously existing correlations. The model was developed from 324 sets of differential liberation data consisting of 2,232 observations. Data was gathered from a number of locations worldwide and covered a broad range of fluid compositions, pressures, and temperatures. Linear and nonparametric regression analyses were used to process and correlate the data. The new correlation, which retained most of the functional form of Pedersen's model, includes modifications that make the model more user-friendly and applicable to black oil simulator models. These modifications to Pedersen's model include use of n-decane as the reference fluid; considering the oil mixture as a single component with molecular weight and critical properties correlated to its density, which may be evaluated from correlations or experimental data; and addition of a functional dependence to the solution gas/oil ratio, formation volume factor, and gas specific gravity. Additionally, using 2,232 points, improved correlations are provided for the oil formation volume factor and the solution gas/oil ratio. This is a progression of the work of Verlade. One of the main advantages of our model is that it is linear in the parameters used for the viscosity prediction. It is therefore easier to recalibrate when needed for simple regression. We also investigated a functional relationship amongst pressure, volume, temperature (PVT) properties and a set of variables required to describe the viscosity correlation using a nonparametric regression analysis. The objective of this analysis was to determine which variables affect viscosity the most and determine the minimum number of variables needed to develop a suitable viscosity correlation. The minimum average absolute error for this analysis was 29��0.2% for the nonfitted nonparametric regression analysis obtained by using GRACE software with 42 coefficients and 13 variables. The average absolute errors obtained from our model using the linear regression analysis were much lower than those obtained from the nonparametric regression analysis obtained from GRACE
Intern experience at the Texas Transportation Institute: an internship report
No full text"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirements for the degree of Doctor of Engineering."Includes vita (leaf 91)Includes bibliographical references (leaf 57)This report discusses the author's engineering experience at the Texas
Transportation Institute (TTI), Texas A&M University from March 1974 through July 1977. A
report of this experience plus twelve additional hours of academic course work were
substituted for an internship according to requirements established by the College of
Engineering. Although the author could not retroactively establish objectives of the type
associated with a typical internship, the work experience gained could be related to the two
general objectives of an intership: 1. To demonstrate an identifiable contribution to the
organization in which the intern served, and 2. To enable the intern to become aware of the
non-technical aspects of working as an engineer in a non-academic environment. While a member
of the Texas Transportation Institute staff, the author worked on a number of projects in the
areas of highway traffic engineering research and the preparation of continuing education
courses for transportation engineering officials. These assignments were contained within the
Urban Transportation Systems Division of TTI. This report delineates the author's contribution
to four particular projects and discusses the technical as well as non-technical experience
gained from each. Having been exposed to more engineering situations than many of the other
Doctor of Engineering students, the author has already formulated some rather specific
milestones for the future. The Doctor of Engineering program is discussed in conjunction with
its potential for helping the author attain these career goals and objectives. Also, some
thoughts are presented regarding the Doctor of Engineering as a viable alternative to the
Ph.D. in preparing for a career in engineering higher education
The design of GaAs HEMT and HBT Bessel-type transimpedance amplifiers
No full textThe need of the everyday user to transfer large amounts of data is driving the need for larger data transfer capacity. Optical communication networks can satisfy this need. To be economically viable, optical transceivers must be integrated onto chips at low cost, using relatively cheap semiconductor processes. The optical preamplifier (transimpedance amplifier) receives optical information and converts it to a useful electrical form. It must operate at high speed, contribute little distortion to the input signal, and add little electrical noise to the incoming signal. This thesis investigates the design techniques in the literature, and proposes new architectures. Two high performance preamplifiers are designed, one using GaAs HEMTs, and the other using GaAs HBTs, each with different circuit techniques. The HEMT preamplifier has a transimpedance gain of 1.4 k����������, the highest in the literature for 10 Gb/s operation, along with a low input referred noise current of about 15 pA/Hz1/2 at a bandwidth of 6.3 GHz. The HBT preamplifier also has a transimpedance gain of 1.5 k����������, with a low input referred noise current of about 7 pA/Hz1/2. Both have clear, open eye-diagrams with a 10 Gb/s bit stream input, and are suitable for integration on a chip. The HEMT preamplifier was implemented as a common-gate, common-source amplifier cascade with a darlington output driver for a 50 ���������� load. The HBT preamplifier was implemented as common-emitter darlington amplifier with shunt peaking, and a simple emitter degenerated output driver for a 50 ���������� load. Both implementations exceeded the bandwidth, transimpedance gain and noise performance typically expected of the transistor technologies used. It is shown that the transimpedance limit can be circumvented by the use of novel architectures and shunt peaking
The long-wavelength view of GG Tau A: rocks in the ring world
No full textWe present the first detection of GG Tau A at centimetre wavelengths, made with the Arcminute Microkelvin Imager Large Array at a frequency of 16 GHz (λ = 1.8 cm). The source is detected at >6 σrms with an integrated flux density of S16GHz = 249 ± 45 µJy. We use these new centimetre-wave data, in conjunction with additional measurements compiled from the literature, to investigate the long-wavelength tail of the dust emission from this unusual protoplanetary system. We use an MCMC-based method to determine maximum likelihood parameters for a simple parametric spectral model and consider the opacity and mass of the dust contributing to the microwave emission. We derive a dust mass of Md ~ 0.1 Msun, constrain the dimensions of the emitting region and find that the opacity index at λ > 7 mm is less than unity, implying a contribution to the dust population from grains exceeding ~4 cm in size. We suggest that this indicates coagulation within the GG Tau A system has proceeded to the point where dust grains have grown to the size of small rocks with dimensions of a few centimetres. Considering the relatively young age of the GG Tau association in combination with the low derived disc mass, we suggest that this system may provide a useful test case for rapid core accretion planet formation models
Intern experience at Honeywell, Inc., Large Information Systems Division: an internship report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical references (leaves 169-173)This report describes the author's internship assignment at Honeywell
Inc. - Large Information Systems Division from January, 1982 through August, 1982. The purpose
of the assignment was to fulfill the internship requirements of the Doctor of Engineering
Program. During the internship, the author held the position of VLSI design engineer, where he
worked on a predefined project. The project's objective was to evaluate how circuit designs
based on an advanced CMOS process, can be applied to hardware products at LISD. The internship
allowed the author to successfully apply the MOS circuit design training, which ws developed
at Texas A&M, to an industrial project. In addition, involvement in different activities
and exposure to the various problems not encountered in academia, made this internship an
invaluable experience
\u27Letters Full of Love\u27: Wayne Booth\u27s Theories of the Implied Author and Reader in Brad Marsh\u27s WWII Correspondence
No full textThis project consists of a qualitative study of the WWII correspondence of Captain Brad Marsh from the collection of letters donated by his daughter on April 26, 2013. I draw from the narrative theory and works of Wayne Booth to examine Marsh’s construction of self as an implied author by examining how he presents his experiences and portrays his emotions. I also examine how Marsh constructs his implied self by paying attention to details such as the information he shares with Lynn and how he presents it. I explore the nature of the implied author and reader in the correspondence and also how the relationship between the implied writer and reader influences the understanding of an unintended audience
Intern Experience at MEL, Inc.: An Internship Report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical references (leaves 82-85)...The author spent a one-year internship at MEL, Inc., a civil and
mechanical engineering consulting firm located in Baton Rouge, Louisiana. By special
arrangement with the president of the firm, the author was able to participate in roles at
various levels within the firm. These activities included engineering design, supervision and
management, project cost control, and interface with top level management. During this period,
the author has been engaged in the following assignments: 1. Serving as senior project
engineer on the Louisiana Training Institution air conditioning and heating project, 2.
Serving at the review and advisory level for three projects, 3. Studying and implementing
computer aided design and drafting system for MEL, Inc. 4. Developing a projet cost control
system that is interactive with the firm's payroll program. 5. Upgrading the firm's computer
capacity. 6. Performing special assignments from the President, Executive Vice-President,
Manager of Operation and Manager of Business and Fiscal Affairs at MEL, Inc. These activities
involved the application of scientific principles to the design, installation, and improvement
of integrated systems of people, materials, and equipment to provide the most effective
operating and work procedures. As a result of this involvement in a wide range of assignments,
the author now has a broadly based experience in a consulting engineering firm as both
engineer and manager. The author also found that well-developed, practical courses in
communication, business, engineering, law, and management from the Doctor of Engineering
program at Texas A&M University contributed greatly to this successful internship with
MEL, Incorporated
Intern experience at International Business Machines Corporation, STD/Austin: an internship report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical references (leaf 72)This report highlights the author's major activities and
accomplishments during his 15 months internship at the International Business Machines (IBM)
Corporation in Austin, Texas. The internship objectives were set so as to provide him with an
experience commensurate with the requirements of the Doctor of Engineering Program at Texas
A&M University. During his internship, the author was involved with a variety of technical
and non-technical projects. His assignments included: 1) The design of an automation strategy
for one manufacturing center. 2) The overall supervision and coordination of a major
automation project. 3) The development of a project scheduling/tracking system. 4)
Co-authoring an "Equipment Specifications Guidelines" form. 5) Other assignments as needed.
The nature and scope of the above assignments provided the author with a broadly based
experience in the Manufacturing Engineering field. Additionally, the leadership role he played
in some of the assignments afforded him with first hand exposure to many aspects of management
and leadership skills. All in all, the author believes that this internship proved to be an
enriching experience and a valuable addition to his overall
education
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