Physical Sciences and Mathematics Commons^™

The Number Of Permutations Realized By A Shift, Sergi Elizalde

Dartmouth Scholarship

A permutation $\pi$ is realized by the shift on N symbols if there is an infinite word on an N-letter alphabet whose successive left shifts by one position are lexicographically in the same relative order as $\pi$. The set of realized permutations is closed under consecutive pattern containment. Permutations that cannot be realized are called forbidden patterns. It was shown in [J. M. Amigó, S. Elizalde, and M. B. Kennel, J. Combin. Theory Ser. A, 115 (2008), pp. 485–504] that the shortest forbidden patterns of the shift on N symbols have length $N+2$. In this paper we give …

Energy Efficient Routing Structures And Wakeup Schemes For Wireless Sensor Networks, Byoung Lee

Computer Science and Engineering Dissertations

Wireless sensor networks, which consist of a large number of sensor nodes and a base station, are used for many applications aimed at collecting information. Each sensor node is equipped with a small amount of battery, limited memory, finite radio range and small CPU. It gathers required information and it sends the information to the base station. The large number of sensors can cover a large area by cooperating with each other to build a multi-hop wireless network. However, the small amount of battery is one of the critical concerns because sensor network life time depends on battery longevity. It …

An Auction Mechanism For Grid Scheduling And Resource Allocation In The Context Of Atlas, Tengkok Aaron Thor

Computer Science and Engineering Dissertations

The technological advancements in the areas of computing and networking over the recent years have led to an emerging infrastructure known as Computational Grids, which provides users with the flexibility of pervasive access to enormous computational resources hosted at remote locations. Effective resource management and job scheduling poses a challenge when constraints such as resource utilization, response time, global and local policies need to be taken into account, while dealing with potentially independent sources of jobs, computational, and storage resources. It must be ensured that scheduling decisions made are still valid by the time a job is to be executed, …

A Privacy Enhanced Situation-Aware Middleware Framework For Ubiquitous Computing Environments, Gautham V. Pallapa

Computer Science and Engineering Dissertations

The Ubiquitous Computing paradigm integrates myriads of small, inexpensive, heterogeneous networked devices, including sensors, distributed throughout the environment, with the intent of enabling context awareness in systems deployed to monitor the environment. This is accomplished by monitoring events, such as access, or utilization of resources, and obtaining knowledge about user activities, and interactions with other entities in the environment. Existing context-aware systems predominantly encapsulate the occurred activities either by using Event-Condition-Action rules, where an instance of the event performs as a trigger, or by prediction mechanisms, such as Dynamic Bayesian Networks, which compute decisions, based on the information obtained. However, …

On The Sensitivity Of Ocean Circulation To Arctic Freshwater Pulses During The Paleocene/Eocene Thermal Maximum, Jesse Tiner Cope

Earth & Environmental Sciences Theses

The Paleocene/Eocene Thermal Maximum (PETM) corresponds to a period characterized by extreme global warming caused by a massive carbon input into the ocean and atmosphere. Approximately 55 Ma in the early Cenozoic, evidence suggests an ice-free Arctic exchanged relatively fresh water with the remainder of the global ocean. In this study we use the Community Climate Systems Model version 3 (CCSM-3), including a carbon cycle model, to examine the sensitivity of deep-water formation and circulation within the global ocean to freshwater exchange from the Arctic Ocean during the PETM. Past modeling experiments show how alterations to seaway exchanges can have …

Seismic Inversion In Fluvial Reservoirs: Building A Geologic Model-Based Inversion For The Stratton Field 3d Survey, Richard Charles Odom

Earth & Environmental Sciences Theses

Seismic surveys, in particular 3-D surveys, are an important tool for imaging geologic structure in the subsurface; they are routinely applied to map structural trends and geometry to define the reservoir structure. Many of the world's oil and gas reservoirs are sands deposited by river systems but the scales of fluvial architectural elements challenge the resolution of the seismic method. One such challenging field is the Stratton field in the FR-4 Gas Play of south Texas; the reservoir is Frio formation, a thick collection (greater than 3000 feet) of stacked fluvial deposits consisting of thin channels and splays of reservoir …

Sedimentology, Ichnology, Depositional Environment Interpretation, And Reservoir Characterization In The Cotton Valley Formation Sandstone In The Amoco Grace Lowry #1, Harrison County, Texas, Justin D. Bagley

Earth & Environmental Sciences Theses

The Cotton Valley formation in east Texas and north Louisiana is a proven hydrocarbon producing tight gas sand reservoir. Understanding the depositional environment, sandstone body geometries and reservoir properties are important for exploration and development. Two hundred and thirty eight feet of conventional core, over the Cotton Valley sandstone interval, was described and interpreted from the Amoco Grace Lowry #1, located in Harrison County, Texas. The sedimentology and ichnology as well as the net sandstone isopachous maps provided the basis for the depositional environment interpretation. Core plug derived porosity and permeability, electric logs, and thin sections were utilized for reservoir …

Electroweak Scale Neutrinos, Enrique Diaz-Mendez

Open Access Theses & Dissertations

We study a model of neutrino mass generation at the Electroweak scale (EW), where Lepton number is broken by the vacuum expectation value of a Standard Model singlet complex scalar field. No energy scales higher than the EW scale are introduced in the model and neutrinos can still get their tiny masses through the general seesaw mechanism. The neutrino Yukawa couplings need not be more suppressed than that of the electron. As part of our results we present the branching ratios of the possible Higgs decays, which should be detectable at near future colliders.

Suswa Volcano, Kenya Rift: Evidence Of Magma Mixing, Na-F Complexing And Eruptions Triggered By Recharge, Vanessa Veronica Espejel Garcia

Open Access Theses & Dissertations

The Cenozoic East African rift system (EARS) is a sequence of grabens, intraplate transforms, accommodation zones, and abundant magmatism. The Central Kenya Peralkaline Province (CKPP) includes a variety of volcanic rocks -trachyte, pantellerite, comendite, phonolite, trachy-basalt, basaltic trachy-andesite, and basalt- which erupted from volcanoes including: Mount Kenya; Eburru and the Greater Olkaria volcanic complexes; Longonot, Menengai, and Suswa volcanoes; and Ndabibi, Elmenteita, and Tandamara mafic volcanic fields. Only two of the volcanoes, Mount Kenya (on the flank of the central graben) and Suswa (the southernmost of the CKPP volcanoes), have phonolites as part of their assemblage.

The evolution of Suswa …

Examples Of Hyperbolic Knots With Distance 3 Toroidal Surgeries In The 3-Sphere, Cesar Garza

Open Access Theses & Dissertations

By the work of Thurston, any surgery on a hyperbolic knot in the 3-sphere produces a hyperbolic 3-manifold except in at most finitely many cases. So far, the figure-8 knot seems to be the best candidate for a hyperbolic knot with the most (8) non-trivial exceptional surgeries. In recent years, much progress has been made in the classification of hyperbolic knots admitting more than one exceptional toroidal surgery. In fact, such classification is known for toroidal surgeries with distance at least 4.

We give a classification of hyperbolic knots in $S^3$ admitting two toroidal surgeries at distance 3, whose slopes …

Insight Into The Physics Of Rupture: Dynamic Triggering Seismicity, Hector Gonzalez-Huizar

Open Access Theses & Dissertations

Seismic waves can trigger earthquakes and tremor at large distances from the causable event. Dynamic triggering occurs when the surface waves from large earthquakes change the stresses conditions on previously overstressed faults, promoting failure. To understand the causative stresses and environments behind dynamic triggering, we model the change in the stress field that the passing of Rayleigh and Love waves cause on a fault plane of arbitrary orientation relative to the direction of propagation of the waves, and apply a Coulomb failure criterion to calculate the potential of these stress changes to trigger seismicity. We apply our model to three …

Exponential Dichotomy Of Ode's, Nada Farid Al-Hanna

Open Access Theses & Dissertations

I present an elementary Functional Analytic proof of the roughness of Exponential Dichotomy of Ordinary Differential Equations (with exponential growth) on an arbitrary Banach Space.

Two-Dimensional Gravity Modeling Of The Rattlesnake Springs Watershed, Carlsbad Caverns National Park, New Mexico, Nikolay D. Boykov

Open Access Theses & Dissertations

A series of non-invasive geophysical investigations at the Rattlesnake Springs part of Carlsbad Caverns National Park, New Mexico, were performed in an effort to better delineate the watershed of the springs. The goal of this project is to determine possible locations of fractures and faults that may control the distribution of groundwater that feeds Rattlesnake Springs. Once the water flow paths are identified, the park will be able to better protect Rattlesnake Springs from environmental hazards, such as oil and gas drilling, as well as from upstream water development. As part of this effort I conducted a precision gravity survey …

An Optimization Approach For The Cascade Vulnerability Problem, Christian Servin

Open Access Theses & Dissertations

In inter-connected systems, where several computers share information with each other, problems may arise when inappropriate information starts to flow through. For example, let us consider a simple scenario of a university composed of three departments: payroll, financial aid, and academic services. We know that the payroll department deals with sensitive information, such as social security numbers, dates of birth, amounts of wages, etc. The financial aid department may use information that payroll owns. Similarly, the academic department communicates with the financial aid department. An intruder can take advantage of this network connectivity and create an inappropriate flow of information …

Experimental Study Of The Response Of Semiconductor Detectors For Edxrf Analysis., Sunil Kumar Valaparla

Open Access Theses & Dissertations

This present work relates to the study and characterization of the response function of an energy-dispersive x-ray spectrometer. The problems of energy, efficiency and resolution calibration of the system operating in the energy (5-60 keV) range are discussed. We present the operation characteristics of the portable pyro-electric x-ray generator (COOL-X) and the application of the calibrated response spectrum in the elemental analysis using X-ray Fluorescence (XRF).

We study the response of the Si(Li)-Pin XR-100CR semiconductor detector to low energy photons. The photopeak efficiency was determined experimentally by using radioisotopes and compared against a theoretical efficiency curve. The efficiency for gamma …

Development Of New Chiral Selectors For Liquid Chromatography And Their Performance Relative To Established Chiral Stationary Phases (Csps), Ping Sun

Chemistry & Biochemistry Dissertations

HPLC with chiral stationary phases (CSPs) has proven to be the most widely applicable and versatile technique for enantiomeric separations. This dissertation discusses new research in three important areas of enantiomeric separations: HPLC method developments for target chiral analytes using the existing CSPs, mechanistic investigations by NMR, and development of new HPLC CSPs. Two classes of commercial chiral stationary phases (cyclodextrin-type and macrocyclic glycopeptide-type) were evaluated by separating specific groups of chiral analytes, including β-lactam compounds and ruthenium(II) polypyridyl complexes. The effects of chiral selector structures, mobile phase compositions, and analyte structures have been examined. For Ru(II) complexes, the newly …

Ionization Competitors Extend The Linear Range Of Electrospray Ionization Mass Spectrometry, Bilal H. Bazzi

Chemistry & Biochemistry Theses

ESI-MS has proven its applicability in quantitative analysis for a wide range of analytes. Its effectiveness relies on achieving sensitivity and linear range, although the latter is known to be limited. ESI-MS response varies among charged species due to differences in analyte structure. The working curve associated with quantitative analysis has a limit of linearity. At high analyte concentration, instrument response plateaus because the surface of the charged droplet reaches saturation. Several studies have proposed to enhance the linear range by enhancing gas-phase analyte charging, by facilitating droplet evaporation, or by improving ion transmission through the mass spectrometer. This thesis …

Design And Synthesis Of A High Potential Ruthenium (Ii) Tetraazatetrapyridopentaphene Complex Capable Of Two-Electron Reduction, Nancy Ruth G. Diaz

Chemistry & Biochemistry Theses

We report the synthesis of a complex, [(phen)₂Ru(tatpph)Ru(phen)₂]⁴⁺ (Ph⁴⁺), which like its predecessor compound, [(phen)₂Ru(tatppc)Ru(phen)₂]⁴⁺ (Pc ⁴⁺), can undergo two sequential 1-electron photoreductions in MeCN in the presence of a sacrificial reductant. The initial complex, Ph ⁴⁺, can be completely regenerated from the singly and doubly reduced forms by exposure to air, although the rate of regeneration for the second photoreduction is much slower than the first. Electrochemical studies have shown that this complex is not only capable of storing multiple reducing equivalents but these equivalents have stored potentials that are significantly higher than the complex Pc ⁴⁺ and are …

Studies Of Enantiomeric Separations Using Capillary Electrophoresis, Man-Yung Benjamin Tong

Chemistry & Biochemistry Theses

The focus of this thesis is on using state-of-the-art capillary electrophoresis (CE) in enantiomeric separations. Chapter 1 provides a brief introduction to enantiomeric separations using CE. Chapters 2 through 5 presents the use of different novel chiral selectors in CE. The selector properties and strategies for developing on enantiomeric separations are considered. Chapter 2 presents an overview on the most broadly useful chiral selectors for CE enantiomeric separations, sulfated cyclodextrins. Chapter 3 presents a new chiral selector, sodium arsenyl L-(+) tartrate. This chiral selector shows enantioselectivity for many amine-containing compounds and ruthenium (II) polypyridyl complexes and produces electropherograms with short …

Analysis Of Shallow Seismicity And Stress Fields In Southeastern Alaska, Hugo Rodriguez

Open Access Theses & Dissertations

Southeastern Alaska is dominated by strike-slip motion along the Queen Charlotte-southern Fairweather fault system (QCFS) in the south and transitions to oblique convergent motion partitioned between strike-slip motion along the Denali and northern Fairweather fault systems and thrusting along faults of the St. Elias region. Geologic complications are further increased by the subduction of the Yakutat microplate beneath North America and glacial processes. By studying regional background seismicity we intend to better determine the current state of stress of southeastern Alaska from the Dixon Entrance to Yakutat Bay. Phase data was gathered for over 4000 earthquakes of depths <20 km and magnitude <5 that occurred from 1973-2005 from Alaskan and Canadian databases. We relocated these earthquakes using the Double-Difference joint hypocenter method. Two areas of interest were identified with high concentrations of seismicity after relocation calculations for the entire southeast Alaska region; Glacier Bay through Yakutat (GBY) and the area surrounding Mt. Ogden (MOG). Earthquake locations in GBY are diffuse with some isolated clusters. The MOG subregion is dominated by a large northeast to southwest trending cluster that trends along the Speel River. We used these relocations and first motion data to estimate the stress fields for earthquake clusters that formed. Only a few of the calculated stress tensors were successful in representing the region's overall tectonic signature. We combined the calculated stress information with GPS, magnetic and gravity data in order determine how plate motion is partitioned in this region and to identify other potentially active faults.

An Experimental Study Of The Hydrodynamics Of Multiphase Flow In Fluidized Beds, Gerardo Vargas

Open Access Theses & Dissertations

Fluidized bed reactors have been widely used as a gasifier in coal gasification processes to convert coal into other forms of energy. At this stage, full fluidization is required to attain the best thermochemical reaction within the fluid-solid mixture. This can only be achieved if the fluid is maintained between minimum fluidization and terminal velocities. To better understand the hydrodynamics of multiphase flow, a fluidized bed was designed and constructed to carry out the investigation. Compressed air and 1-mm glass beads were used to determine gas minimum fluidization and terminal velocities at three different particle concentrations. The solids were enclosed …

Estimating Variation In Stiffness And Volume Change Of Clays From Geochemical And Index Properties, Cynthia Roxanna Zuniga

Open Access Theses & Dissertations

Clayey soils from six different locations in Texas were analyzed and evaluated with respect to their expansion and shrinkage and change in stiffness associated with moisture content variation. These soils consist of five high plasticity-index (PI) clays (PI greater than 25) and one low-PI clay (PI = 17). The behavior of the clays changes dramatically with moisture content fluctuation, thus causing stiffness and volume changes throughout the year. Total or differential volume movements caused by swell or shrinkage strains of expansive soils and reduction in modulus can exert enough pressure to damage the pavements and cause maintenance problems.

The intent …

Third Grade Students' Challenges And Strategies To Solving Mathematical Word Problems, Elizabeth Bernadette

Open Access Theses & Dissertations

This project explores the difficulties and challenges that third grade students face solving mathematical word problems. Three students were asked to be participants and share their knowledge on this topic as well as their work. After extensive interviews it was concluded that the challenges of mathematical word problems include but are not limited to the level of reading comprehension, conceptual understanding of mathematical concepts, and the belief that math is a compilation of computations and unexplainable procedures. The participants provided insight as to what strategies are helpful to students. These strategies include group discussion on problem solving strategies, self-assessment, incorporating …

Dc Electrokinetic Transport Of Cylindrical Cells In Straight Microchannels, Ye Ai, Ali Beskok, David T. Gauthier, Sang W. Joo, Shizhi Qian

Biological Sciences Faculty Publications

Electrokinetic transport of cylindrical cells under dc electric fields in a straight microfluidic channel is experimentally and numerically investigated with emphasis on the dielectrophoretic (DEP) effect on their orientation variations. A two-dimensional multiphysics model, composed of the Navier-Stokes equations for the fluid flow and the Laplace equation for the electric potential defined in an arbitrary Lagrangian-Eulerian framework, is employed to capture the transient electrokinetic motion of cylindrical cells. The numerical predictions of the particle transport are in quantitative agreement with the obtained experimental results, suggesting that the DEP effect should be taken into account to study the electrokinetic transport of …

ข่าว & กิจกรรมสิ่งแวดล้อม

Thai Environment

No abstract provided.

เยาวชนไทยใส่ใจสิ่งแวดล้อม

Thai Environment

No abstract provided.

บุคคลสำคัญด้านสิ่งแวดล้อม

Thai Environment

No abstract provided.

นวัตกรรม & เทคโนโลยีสิ่งแวดล้อม

Thai Environment

No abstract provided.

สัมภาษณ์ : คิดนอกกรอบกับดีไซเนอร์รักษ์สิ่งแวดล้อม

Thai Environment

No abstract provided.

สวยซ่อน(สาร)พิษ ของราชินีดอกไม้แห่งความรัก, ชาคริต ดวงใจ

Thai Environment

No abstract provided.