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Recent documents in DigitalCommons@UTEPen-usWed, 04 May 2016 01:37:29 PDT3600"I was nothing but a lender of what I was ordered to supply..." Francisco Amangual, trustee of the presidio and las companias volantes in the Spanish borderlands, 1701--1812
http://digitalcommons.utep.edu/dissertations/AAI3724941
http://digitalcommons.utep.edu/dissertations/AAI3724941Fri, 29 Apr 2016 16:21:05 PDT
Francisco Amangual represented an agent for the Spanish colonial empire throughout his career as a presidio paymaster and in his ultimate role as the captain of a specialized unit of the borderlands military, the so-called compañías volantes, or flying squadrons. This study reorients colonial borderlands scholarship by making clear the significance of the empire's lesser known intermediaries charged with documenting the seemingly mundane activities of life in the garrison. Further, assigning a cogent place to the presence of the volantes allows for a more thoroughgoing understanding of their history by disentangling their place from among the various presidial units in the Spanish colonial frontier.^
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Roland RodriguezLatin American history|History|Hispanic American studiesRecovery of nutrient nitrogen from municipal wastewater residuals by gas membrane separation
http://digitalcommons.utep.edu/dissertations/AAI1593365
http://digitalcommons.utep.edu/dissertations/AAI1593365Fri, 29 Apr 2016 16:20:54 PDT
There are relatively high amounts of ammonia returned to the headworks of a municipal wastewater plant that are extracted from the dewatering process. This ammonia load contributes to a significant oxygen demand in the secondary treatment, requiring greater air blower energy costs. This goal of this research was to evaluate the feasibility of the recovery of an ammonium sulfate product from belt press filtrate. The objectives of this research were to: (1) analyze wastewater treatment average monthly data flows and constituents with respect to ammonia nitrification, (2) the evaluate the technical performance of a two sage gas-separation membrane for recovering ammonia separation, and (3) evaluate the economic feasibility of wastewater plants operating ammonium sulfate production. Results showed that, for the years 2012–2013, the Bustamante Wastewater Treatment Plant had a monthly average of 1197 lb/day of ammonia (as N), which required an average energy cost of $60,868per year. The ammonia separation process was observed to operate optimally at a pH of 9.8 in the belt press filtrate influent, which maximizes the ammonia speciation without causing calcium carbonate precipitation. At a filtrate feed flowrate of 2.0 gpm in the pilot system, 68% of the ammonia was removed, producing approximately 11 lb/day of ammonium sulfate. Scale-up to treat the average 0.18 million gallons per day (mgd) of belt press filtrate would have an estimated annual energy cost savings of $23,900 and ammonium sulfate revenue of $15,135 per month for a total net financial benefit of $205,500 per year. With an estimated total capital cost of $1,680,280 the simple payback period was estimated to be 8 years. Future work should evaluate more efficient particle pretreatment to minimize fouling of the gas-separation membranes.^
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Evelyn RiosCivil engineering|Environmental engineeringReckless anxiety
http://digitalcommons.utep.edu/dissertations/AAI10061480
http://digitalcommons.utep.edu/dissertations/AAI10061480Fri, 29 Apr 2016 16:20:36 PDT
Reckless Anxiety will focus on fourteen short stories that have characters who all suffer from some form of mental illness, compulsion or disorder. The title is itself a paradox, because anxiety in its general sense could make someone with it more cautious than normal. I wanted to take it to an extreme level and approach writing with the recklessness of an artist afraid of what could happen should he ever stop moving or stop dancing. ^ PROJECT BACKGROUND: Before I started developing my thesis, as a writer I felt as if I was on a path with only one direction. In the periphery, I could see that there were other Latin@ authors and poets that had been charting out the map and making incredible inroads into the literary world. I felt disconnected to that, as if those paths were meant for someone else. I had, however, made inroads myself into different venues of writing. I had been a journalist in high school and in college and had adapted those lessons into my professional career. But for writing on my spare time, that process started changing when I enrolled at the University of Texas at El Paso’s Online Master of Fine Arts in Creative Writing. Before that, my biggest hangup as a writer was being genre-stricken—that is, sticking to either sci-fi or fantasy. Once I started at UTEP, I started a process that made me appreciate, learn, and breathe literary fiction. ^ Writing short stories is a process that, for me, begins first and foremost with writing poetry. In my poetry, I use both image and line to the best of my ability to describe things around me. As a poet, I find something specific that calls to me, whether it is a building off of Houston’s Southwest Freeway, a particularly strong emotion at the closing of a Waldenbooks in Brownsville, or seeing two complete strangers dance the night away in a country western club. Then I scribble a page or two about that particular moment on a notepad that tends to be on my person most of the time. I then wait a week before transferring the physical notes into digital ink, where it then sits in a designated “crockpot” folder. Here, my ideas stew for one more week while I initiate other projects. Once the week passes, I re-open my project and determine whether or not the poem is ready. I have found that waiting several weeks to truly determine the worth of a poem rather than trying to perfect a poem in one sitting, and to view that poem with new clarity, has allowed me to greatly improve my poetic talents. If it is ready, then it is saved and kept in a folder for submissions. If it is not, then I set the poem aside in another folder and cannibalize the imagery for something else, or perhaps for future edits. Within this graveyard of incomplete poetry I can see if there is a connection or enough substance and enough imagery to go deeper. This makes up the first component of my fiction process. The other component involves having all that occur inside my own mind, everything from the initial draft to determining the worth or potential of a creative project. The union of these two processes is what allowed the birth of Reckless Anxiety as my thesis.^
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Hugo Esteban Rodriguez CastanedaCreative writingEl Paso Smelting Works: Sewer System Dep: General Plan of Sewer System
http://digitalcommons.utep.edu/maps/5
http://digitalcommons.utep.edu/maps/5Thu, 28 Apr 2016 06:40:09 PDTEl Paso Smelting WorksOn Geometry of Finsler Causality: For Convex Cones, There Is No Affine-Invariant Linear Order (Similar to Comparing Volumes)
http://digitalcommons.utep.edu/cs_techrep/1008
http://digitalcommons.utep.edu/cs_techrep/1008Fri, 15 Apr 2016 09:29:51 PDT
Some physicists suggest that to more adequately describe the causal structure of space-time, it is necessary to go beyond the usual pseudo-Riemannian causality, to a more general Finsler causality. In this general case, the set of all the events which can be influenced by a given event is, locally, a generic convex cone, and not necessarily a pseudo-Reimannian-style quadratic cone. Since all current observations support pseudo-Riemannian causality, Finsler causality cones should be close to quadratic ones. It is therefore desirable to approximate a general convex cone by a quadratic one. This cane be done if we select a hyperplane, and approximate intersections of cones and this hyperplane. In the hyperplane, we need to approximate a convex body by an ellipsoid. This can be done in an affine-invariant way, e.g., by selecting, among all ellipsoids containing the body, the one with the smallest volume; since volume is affine-covariant, this selection is affine-invariant. However, this selection may depend on the choice of the hyperplane. It is therefore desirable to directly approximate the convex cone describing Finsler causality with the quadratic cone, ideally in an affine-invariant way. We prove, however, that on the set of convex cones, there is no affine-covariant characteristic like volume. So, any approximation is necessarily not affine-invariant.
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Olga Kosheleva et al.Why Locating Local Optima Is Sometimes More Complicated Than Locating Global Ones
http://digitalcommons.utep.edu/cs_techrep/1007
http://digitalcommons.utep.edu/cs_techrep/1007Fri, 15 Apr 2016 09:29:34 PDT
In most applications, practitioners are interested in locating global optima. In such applications, local optima that result from some optimization algorithms are an unnecessary side effect. In other words, in such applications, locating global optima is a much more computationally complex problem than locating local optima. In several practical applications, however, local optima themselves are of interest. Somewhat surprisingly, it turned out that in many such applications, locating all local optima is a much more computationally complex problem than locating all global optima. In this paper, we provide a theoretical explanation for this surprising empirical phenomenon.
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Olga Kosheleva et al.Do we have compatible concepts of epistemic uncertainty?
http://digitalcommons.utep.edu/cs_techrep/1006
http://digitalcommons.utep.edu/cs_techrep/1006Fri, 15 Apr 2016 09:29:14 PDT
Epistemic uncertainties appear widely in civil engineering practice. There is a clear consensus that these epistemic uncertainties need to be taken into account for a realistic assessment of the performance and reliability of our structures and systems. However, there is no clearly defined procedure to meet this challenge. In this paper we discuss the phenomena that involve epistemic uncertainties in relation to modeling options. Particular attention is paid to set-theoretical approaches and imprecise probabilities. The respective concepts are categorized, and relationships are highlighted.
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Michael Beer et al.Bell-Shaped Curve for Productivity Growth: An Explanation
http://digitalcommons.utep.edu/cs_techrep/1005
http://digitalcommons.utep.edu/cs_techrep/1005Fri, 15 Apr 2016 09:28:55 PDT
A recent analysis of the productivity growth data shows, somewhat surprisingly, that the dependence of the 20-century productivity growth on time can be reasonably well described by a Gaussian formula. In this paper, we provide a possible theoretical explanation for this observation.
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Olga Kosheleva et al.Adjoint Fuzzy Partition and Generalized Sampling Theorem
http://digitalcommons.utep.edu/cs_techrep/1004
http://digitalcommons.utep.edu/cs_techrep/1004Fri, 15 Apr 2016 09:28:36 PDT
A new notion of adjoint fuzzy partition is introduced and the reconstruction of a function from its F-transform components is analyzed. An analogy with the Nyquist-Shannon-Kotelnikov sampling theorem is discussed.
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Irina Perfilieva et al.Why Dependence of Productivity on Group Size Is Log-Normal
http://digitalcommons.utep.edu/cs_techrep/1003
http://digitalcommons.utep.edu/cs_techrep/1003Fri, 15 Apr 2016 09:28:12 PDT
Empirical analysis shows that, on average, the productivity of a group log-normally depends on its size. The current explanations for this empirical fact are based on reasonably complex assumptions about the human behavior. In this paper, we show that the same conclusion can be made in effect, from first principles, without making these complex assumptions.
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Francisco Zapata et al.Robustness as a Criterion for Selecting a Probability Distribution Under Uncertainty
http://digitalcommons.utep.edu/cs_techrep/1002
http://digitalcommons.utep.edu/cs_techrep/1002Fri, 15 Apr 2016 09:27:51 PDT
Often, we only have partial knowledge about a probability distribution, and we would like to select a single probability distribution $\rho(x)$ out of all probability distributions which are consistent with the available knowledge. One way to make this selection is to take into account that usually, the values $x$ of the corresponding quantity are also known only with some accuracy. It is therefore desirable to select a distribution which is the most robust -- in the sense the x-inaccuracy leads to the smallest possible inaccuracy in the resulting probabilities. In this paper, we describe the corresponding most robust probability distributions, and we show that the use of resulting probability distributions has an additional advantage: it makes related computations easier and faster.
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Songsak Sriboonchitta et al.Why Superellipsoids: A Probability-Based Explanation
http://digitalcommons.utep.edu/cs_techrep/1001
http://digitalcommons.utep.edu/cs_techrep/1001Fri, 15 Apr 2016 09:27:32 PDT
In many practical situations, it turns out that the set of possible values of the deviation vector is (approximately) a super-ellipsoid. In this paper, we provide a theoretical explanation for this empirical fact -- an explanation based on the natural notion of scale-invariance.
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Pedro Barragan Olague et al.Comparison of Formulations of Applied Tasks With Interval, Fuzzy Set and Probability Approaches
http://digitalcommons.utep.edu/cs_techrep/1000
http://digitalcommons.utep.edu/cs_techrep/1000Fri, 15 Apr 2016 09:27:15 PDT
The focus of this paper is to clarify the concepts of solutions in linear equations in interval, probabilistic and fuzzy sets setting for real word tasks. There is a fundamental difference between formal definitions of the solutions and physically meaningful concept of solution in applied tasks when equations have uncertain components. For instance, a formal definition of the solution in terms of Moore interval analysis can be completely irrelevant for solving a real world task. We show that formal definitions must follow meaningful concept of the solution in the real world. The paper proposed several formalized definitions of the concept of solution for the linear equations with uncertain components in the interval, probability and fuzzy sets terms.
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Boris Kovalerchuk et al.Voting Aggregation Leads to (Interval) Median
http://digitalcommons.utep.edu/cs_techrep/999
http://digitalcommons.utep.edu/cs_techrep/999Fri, 15 Apr 2016 09:26:58 PDT
When we have several results of measuring or estimating the same quantities, it is desirable to aggregate them into a single estimate for the desired quantities. A natural requirement is that if the majority of estimates has some property, then the aggregate estimate should have the same property. It turns out that it is not possible to require this forall possible properties -- but we can require it for bounds, i.e., for properties that the value of the quantity is in between given bounds a and b. In this paper, we prove that if we restrict the above "voting" approach to such properties, then the resulting aggregate is an (interval) median. This result provides an additional justification for the use of median -- in addition to the usual justification that median is the most robust aggregate operation.
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Olga Kosheleva et al.Why Sparse? Fuzzy Techniques Explain Empirical Efficiency of Sparsity-Based Data- and Image-Processing Algorithms
http://digitalcommons.utep.edu/cs_techrep/998
http://digitalcommons.utep.edu/cs_techrep/998Fri, 15 Apr 2016 09:26:36 PDT
In many practical applications, it turned out to be efficient to assume that the signal or an image is sparse, i.e., that when we decompose it into appropriate basic functions (e.g., sinusoids or wavelets), most of the coefficients in this decomposition will be zeros. At present, the empirical efficiency of sparsity-based techniques remains somewhat a mystery. In this paper, we show that fuzzy-related techniques can explain this empirical efficiency. A similar explanation can be obtained by using probabilistic techniques; this fact increases our confidence that our explanation is correct.
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Fernando Cervantes et al.How to Describe Measurement Uncertainty and Uncertainty of Expert Estimates?
http://digitalcommons.utep.edu/cs_techrep/997
http://digitalcommons.utep.edu/cs_techrep/997Fri, 15 Apr 2016 09:26:16 PDT
Measurement and expert estimates are never absolutely accurate. Thus, when we know the result M(u) of measurement or expert estimate, the actual value A(u) of the corresponding quantity may be somewhat different from M(u). In practical applications, it is desirable to know how different it can be, i.e., what are the bounds f(M(u)) <= A(u) <= g(M(u)). Ideally, we would like to know the tightest bounds, i.e., the largest possible values f(x) and the smallest possible values g(x). In this paper, we analyze for which (partially ordered) sets of values such tightest bounds always exist: it turns out that they always exist only for complete lattices.
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Nicolas Madrid et al.Chemical Kinetics in Situations Intermediate Between Usual and High Concentrations: Fuzzy-Motivated Derivation of the Formulas
http://digitalcommons.utep.edu/cs_techrep/996
http://digitalcommons.utep.edu/cs_techrep/996Fri, 15 Apr 2016 09:25:55 PDT
In the traditional chemical kinetics, the rate of each reaction A + ... + B --> ... is proportional to the product cA * ... * cB of the concentrations of all the input substances A, ..., B. For high concentrations cA, ..., cB, the reaction rate is known to be proportional to the minimum min(cA, ..., cB). In this paper, we use fuzzy-related ideas to derive the formula of the reaction rate for situations intermediate between usual and high concentrations.
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Olga Kosheleva et al.How to Predict Nesting Sites and How to Measure Shoreline Erosion: Fuzzy and Probabilistic Techniques for Environment-Related Spatial Data Processing
http://digitalcommons.utep.edu/cs_techrep/995
http://digitalcommons.utep.edu/cs_techrep/995Fri, 15 Apr 2016 09:25:28 PDT
In this paper, we show how fuzzy and probabilistic techniques can be used in environment-related data processing. Specifically, we will show that these methods help in solving two environment-related problems: how to predict the birds' nesting sites and how to measure shoreline erosion.
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Stephen Escarzaga et al.How to Make a Solution to a Territorial Dispute More Realistic: Taking into Account Uncertainty, Emotions, and Step-by-Step Approach
http://digitalcommons.utep.edu/cs_techrep/994
http://digitalcommons.utep.edu/cs_techrep/994Fri, 15 Apr 2016 09:25:15 PDT
In many real-life situations, it is necessary to divide a disputed territory between several interested parties. The usual way to perform this division is by using Nash's bargaining solution, i.e., by finding a partition that maximizes the product of the participants' utilities. However, this solution is based on several idealized assumptions: that we know the exact values of all the utilities, that division is performed on a purely rational basis, with no emotions involved, and that the entire decision is made once. In practice, we only know the utilities with some uncertainty, emotions are often involved, and the solution is often step-by-step. In this paper, we show how to make a solution to a territorial dispute more realistic by taking all this into account.
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Mahdokhat Afravi et al.How to Estimate Resilient Modulus for Unbound Aggregate Materials: A Theoretical Explanation of an Empirical Formula
http://digitalcommons.utep.edu/cs_techrep/993
http://digitalcommons.utep.edu/cs_techrep/993Fri, 15 Apr 2016 09:24:54 PDT
To ensure the quality of pavement, it is important to make sure that the resilient moduli -- that describe the stiffness of all the pavement layers -- exceed a certain threshold. From the mechanical viewpoint, pavement is a non-linear medium. Several empirical formulas have been proposed to describe this non-linearity. In this paper, we describe a theoretical explanation for the most accurate of these empirical formulas.
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Pedro Barragan Olague et al.