Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"WDS"”.
-
The behavior of hydrogen and helium at white dwarf photosphere conditions
White Dwarfs (WDs) represent the evolutionary endpoint for nearly all stars in the universe. Their atmospheres are usually dominated by either hydrogen, helium, or carbon. In astrophysics, WDs are used to determine the age of the universe, to test current stellar evolutionary models, and to …
-
The integration of topology and entropy-based reliability into the optimal design of water distribution systems
Establishing a new water distribution system (WDS) essentially involves proper planning of system components to minimize cost, sizing of such components to operate under normal operating conditions and assessing system performance under abnormal operating conditions to minimize effects of …
-
Dust disks around hot white dwarfs and central stars of planetary nebulae
… disks have been discovered around white dwarfs (WDs): small dust disks within the Roche limits of their WDs, and a large dust disk around the hot central WD of the Helix planetary nebula (PN), possibly produced by collisions among Kuiper Belt-like objects.To search for more dust disks of the …
-
Star Formation History of the Milky Way Galaxy Disk Using a Hierarchical Model
… population is to learn about the white dwarfs (WDs) from that particular Galactic population. Understanding the white dwarfs can tell us a lot about the Galaxy's history. White dwarfs are the remnants of stellar evolution, providing an age dating method for various Galactic populations. This …
-
Locating Optimal Water Quality Monitoring Locations Using Demand Coverage Index Method
… on smaller water distribution systems (WDS).</p> <p>The analysis results lay out a number of monitoring stations that should be used to prevent a large scale contamination event from occurring. The number of monitoring stations will vary depending on funding for water infrastructure and …
-
Statistical nano-chemo-mechanical assessment of shale by wave dispersive spectroscopy and nanoindentation
… involving grids of wave dispersive spectroscopy (WDS) spot analyses and statistical clustering of the chemical data generated by the experiments. This so-called statistical grid WDS technique was coupled with grid nanoindentation experiments as a means to assess the nanochemomechanics of shale …
-
Effects of Grower Management Practices and Field Characteristics on Insect Damage to Sweetpotato (Ipomoea batatas (L. Lam.) Roots.
… by wireworm, Diabrotica spp., and Systena spp. (WDS) complex, sweetpotato flea beetle, white grubs, and whitefringed beetle was categorized by the incidence of roots injured by those species and the severity of injury on damaged roots. Severity was determined by measuring the length of …
-
A small-angle scattering analysis of the influence of manufacture and thermal induced morphological changes on the thermal conductivity of EB-PVD PYSZ thermal barrier coatings
… Wärmedämmschichten (EB-PVD WDS) auf metallischen Turbinenschaufeln von Triebwerken führt zu einer Verbesserung der Schaufelinnenkühlung, d.h. die Eintrittstemperatur der Gase in der Turbine kann erhöht werden und somit die Effizienz des Triebwerks gesteigert werden. Die …
-
Cyber-Physical Attacks and Detection Methods in Water Distribution Systems
… security, weaken the Water Distribution System (WDS) security and many attackers compromise the critical components of WDS. Cyber-physical attacks (CPAs) are considered one of the biggest challenges that decrease the security factors in WDS by disrupting normal operations and tampering with the …
-
Enhanced Pump Schedule Optimization For Large Water Distribution Networks To Maximize Environmental And Economic Benefits
… cost of small water distribution systems (WDS). Still reducing the environmental footprint of these systems and dealing with large and complicated water distribution system is a challenge.</p> <p>In this study, we aimed to develop a multiobjective optimization tool (PEPSO) for reducing …
-
Information Analysis of Spatiotemporal Data Stream–Models, Algorithms and Evaluations
… application is the water distribution system (WDS), where hydraulic sensors are deployed in the underground water pipe network. Each sensor measures hundreds of thousands of hydraulic readings per day. In the UVs surveillance application, a grid-based model is proposed to aggregate UAV’s global …
-
Active leakage management with bayesian networks
… countries’ Water distribution systems (WDS’s) remain limited. This is attributed to some limiting challenges to leakage management faced by these WDS. Some of these include; financial constraints, poor record-keeping systems, and inadequate technicalskillsandtechnology. …
-
Critical Node Analysis for Water Distribution System Using Flow Distribution
… Preparedness and Response Act” in 2002 to harden WDS. This study aimed to develop a method that locates critical nodes without hydraulic analysis of every failure scenario, applicable for any size WDS, incorporates critical infrastructure, and capable of verifying method accuracy. The Flow …
-
Petrology of the Taconian-Acadian Overlap Zone, Hartland Belt, Western Connecticut
… dispersive X-ray compositional images (WDS images) along with quantitative traverses for major (Fe, Mg, Mn and Ca) elements were collected for garnet porphyroblasts in each of the samples. Trace (Y, P, Sc, Ti and Cr) element WDS images and quantitative traverses were then collected for …
-
A penalty-free multi-objective evolutionary optimization approach for the design and rehabilitation of water distribution systems
… part of managing a water distribution system (WDS) right from the initial phase of designing a new system to the latter stage of the network where rehabilitation and upgrading works are a necessity. This also includes the on-going operation of the WDS in particular the minimization of energy …
-
Resource Allocation Schemes And Performance Evaluation Models For Wavelength Division Multiplexed Optical Networks
… buffering capability. A placement algorithm, k-WDS, for the sparse placement of FDLs at a set of selected nodes in Optical Burst Switching (OBS) networks is proposed. The algorithm can handle both uniform and non-uniform traffic patterns. Extensive performance tests have shown that k-WDS …
-
Exotic Stars and Thorne-Żytkow Objects
… magnetized compact objects, white dwarfs (B-WDs) and neutron stars (B-NS / magnetars) as well as the relevant microphysics that we must consider to study these objects. In particular I discuss the mechanisms by which thermal neutrinos can be produced in such objects. This is essential to …
-
Synthesis, characterization, and thermal properties of ceramic-fullerene thin films
… studied using Raman spectrometry, TEM, XRD, and WDS. Strong interactions between neighboring ZrO2 grains and dispersed C60 are manifested in the decreased desorption rate of C60 from the ZrO2 surface, and effects of dispersed C60 on the ZrO2 microstructure are observed using TEM. The potential …
-
Entwicklung und Charakterisierung einer neuen Clusterquelle für die Herstellung dünner Schichten
… Die hergestellten Schichten wurden durch XPS- & WDS-Messungen in Bezug auf die chemische Zusammensetzung charakterisiert.
-
Properties and sensor performance of zinc oxide thin films
… films were investigated. Using AFM, SEM, XRD and WDS, the 02/Ar ratios during sputtering and Al dopant were found to control the property of ZnO films. Subsequent annealing at 700 C improved the sensor response of the films considerably although it had only minor effects on the microstructure. DC …
Page 1 of 2