2,089 Matching Results

This system will be undergoing maintenance April 18th between 9:00AM and 12:00PM CDT.

Search Results

Advanced search parameters have been applied.
in subjects: "precipitation"  
Results: 1 - 24 next
open access

High-Throughput Investigation of Multiscale Deformation Mechanism in Additively Manufactured Ni Superalloy

Description: Article discusses how, in this paper, Inconel 718 (IN718) superalloy was processed by laser powder-bed fusion additive manufacturing (L-PBFAM), followed by heat treatment. Evidence of extensive deformation of twin networks and dislocation cells was revealed by transmission electron microscopy of the deformed region under the nanoindentation tip.
Date: February 17, 2023
Creator: Dhal, Abhijeet; Agrawal, Priyanka; Haridas, Ravi Sankar; Gaddam, Supreeth; Sharma, Aishani; Parganitha, Digvijay et al.
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Collaborative Research: MRA: Particulates in canopy flowpaths: A missing mass flux at the macrosystem scale?

Description: Data management plan for the grant, "Collaborative Research: MRA: Particulates in canopy flowpaths: A missing mass flux at the macrosystem scale?" This research will investigate a vital, but currently uncharacterized, macrosystem biogeochemical function within forest canopies at the very start of the terrestrial hydrologic cycle: particulate concentration, flux, and composition in rainwaters draining from forest canopies. We will address three major objectives: (1) Estimate the net rainfall (TF… more
Date: 2022-08-01/2027-07-31
Creator: Ponette-González, Alexandra G.
Item Type: Refine your search to only Text
Partner: UNT College of Liberal Arts & Social Sciences
open access

The extreme rainfall gradient of the Cape Horn Biosphere Reserve and its impact on forest bird richness

Description: Article studying the effects of extreme rainfall variations on forest bird communities by monitoring the bird species richness in the different forest types present in the Cape Horn Biosphere Reserve (CHBR).
Date: January 20, 2022
Creator: Quilodrán, Claudio S.; Sandvig, Erik M.; Aguirre, Francisco; de Aguilar, Juan Rivero; Barroso, Omar; Vásquez, Rodrigo A. et al.
Item Type: Refine your search to only Article
Partner: University of North Texas

Synergistic Effects of Lattice Instability and Chemical Ordering on FCC Based Complex Concentrated Alloys

Description: The current work investigates how the interactions among constituent elements in high entropy alloys or complex concentrated alloys (HEA/CCAs) can lead to lattice instability and local chemical ordering which in turn affects the microstructure and properties of these alloys. Using binary enthalpies of mixing, the degree of ordering in concentrated multi-component solid solutions was successfully tailored by introducing Cr, Al and Ti in a CoFeNi HEA/CCA. CoFeNi was selected as the base alloy to … more
Date: August 2021
Creator: Dasari, Sriswaroop
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Wildfire Influence on Rainfall Chemistry and Deposition in Texas during the 2011-2014 Drought

Description: From 2011 to 2014, one of the most severe and intense droughts in Texas recorded history led to widespread wildfires across the state, with unknown effects on atmospheric nutrient and pollutant deposition. The objectives of this research were to: (1) characterize the frequency, magnitude, and spatiotemporal distribution of Texas wildfires (2011-2014); (2) identify smoke occurrence and source regions at eight Texas National Atmospheric Deposition Program (NADP) National Trends Network (NTN) site… more
Date: August 2021
Creator: Williamson, Thomas
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Constrained Stochastic Weather Generator for Daily Mean Air Temperature and Precipitation

Description: This article develops and tests a constrained stochastic weather generator (CSWG) for producing daily mean air temperature and precipitation based on annual mean air temperature and precipitation from tree-ring records. It presents a unique method that can be used to explore historic (e.g., archeological questions) or future (e.g., climate change) daily weather conditions based upon specified annual values.
Date: January 21, 2021
Creator: Pan, Feifei; Nagaoka, Lisa; Wolverton, Steven J.; Atkinson, Samuel F.; Kohler, Timothy A. & O'Neill, Marty
Item Type: Refine your search to only Article
Partner: University of North Texas

Analysis of Interrelationships between Climate Change and Cotton Yield in Texas High Plains

Description: The Texas High Plains produces the most substantial amount of cotton in Texas. The region is a semi-arid area with limited precipitation, and it is, therefore, susceptible to climate change. Cotton production in the Texas High Plains is mostly dependent on irrigation to increase yield. The overall goal of this research was to study the interrelationships between climate change and cotton yield using correlation analysis and also to study how climate has changed in the region using trend analys… more
Date: May 2020
Creator: Sarbeng, Lorenda
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Deformation induced intermediate metastable lattice structures facilitate ordered B2 nucleation in a fcc-based high entropy alloy

Description: This article reports a novel mixed-mode coupled displacive-diffusional transformation resulting in homogeneously distributed intra-granular B2 precipitates within the fcc matrix.
Date: December 5, 2018
Creator: Choudhuri, Deep; Shukla, Shivakant; Gwalani, Bharat; Banerjee, Rajarshi & Mishra, R. S.
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Ultrasonic Processing of Aluminum 2139 and 7050

Description: Acoustics is the study of all sound waves, with ultrasound classified as those frequencies above 20,000 Hz. Currently, ultrasound is being used in many industries for a variety of purposes such as ultrasonic imaging, ultrasonic assisted friction stir welding, and ultrasonic spot welding. Despite these uses, the effects of ultrasound on phase stability and resultant mechanical properties has been minimally analyzed. Here we study the impact waves play in ultrasonic welding and design an appar… more
Date: August 2018
Creator: Reed, Jordan Derek
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Evaluation of Climate Change Impacts on Wetland Vegetation in the Dunhuang Yangguan National Nature Reserve in Northwest China Using Landsat Derived NDVI

Description: This article uses 41 Landsat images between 1988 and 2016 to calculate the normalized difference vegetation indices (NVDIs) of the wetland vegetation at Xitugou (XTG) and Wowachi (WWC) inside the Dunhuang Yangguan National Nature Reserve in northwest China in order to assess the impacts of climate change on wetland vegetation.
Date: May 10, 2018
Creator: Pan, Feifei; Xie, Jianping; Lin, Juming; Zhao, Tingwei; Ji, Yongyuan; Hu, Qi et al.
Item Type: Refine your search to only Article
Partner: UNT College of Liberal Arts & Social Sciences
open access

Crystallographically degenerate B2 precipitation in a plastically deformed fcc-based complex concentrated alloy

Description: Article describes the development of bcc-ordered B2 and fcc phases manifested in three different orientation relationships (ORs) in the same microstructure: Kurdjumov–Sachs, Nishiyama–Wasserman and Pitsch.
Date: January 22, 2018
Creator: Choudhuri, Deep; Shukla, Shivakant; Green, Whitley; Gwalani, Bharat; Ageh, Victor; Banerjee, Rajarshi et al.
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Developing Precipitation Hardenable High Entropy Alloys

Description: High entropy alloys (HEAs) is a concept wherein alloys are constructed with five or more elements mixed in equal proportions; these are also known as multi-principle elements (MPEs) or complex concentrated alloys (CCAs). This PhD thesis dissertation presents research conducted to develop precipitation-hardenable high entropy alloys using a much-studied fcc-based equi-atomic quaternary alloy (CoCrFeNi). Minor additions of aluminium make the alloy amenable for precipitating ordered intermetallic … more
Date: August 2017
Creator: Gwalani, Bharat
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Snowfall

Description: "This indicator uses two different measures to show how snowfall has changed in the contiguous 48 states."
Date: August 2016
Creator: United States. Environmental Protection Agency.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Snowpack

Description: "This indicator measures trends in mountain snowpack in the western United States."
Date: August 2016
Creator: United States. Environmental Protection Agency.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Thermomechanical Processing, Additive Manufacturing and Alloy Design of High Strength Mg Alloys

Description: The recent emphasis on magnesium alloys can be appreciated by following the research push from several agencies, universities and editorial efforts. With a density equal to two-thirds of Al and one-thirds of steel, Mg provides the best opportunity for lightweighting of metallic components. However, one key bottleneck restricting its insertion into industrial applications is low strength values. In this respect, Mg-Y-Nd alloys have been promising due to their ability to form strengthening precip… more
Date: May 2016
Creator: Palanivel, Sivanesh
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Sense of Place

Description: Lesson plan containing a collection of activities and resources regarding sense of place that meet state education standards and national sustainability standards for the 2nd grade level.
Date: August 29, 2014
Creator: Treadway, Heather
Item Type: Refine your search to only Text
Partner: UNT Office of Sustainability
open access

Comparative Coarsening Kinetics of Gamma Prime Precipitates in Nickel and Cobalt Base Superalloys

Description: The increasing technological need to push service conditions of structural materials to higher temperatures has motivated the development of several alloy systems. Among them, superalloys are an excellent candidate for high temperature applications because of their ability to form coherent ordered precipitates, which enable the retention of high strength close to their melting temperature. The accelerated kinetics of solute diffusion, with or without an added component of mechanical stress, le… more
Date: August 2014
Creator: Meher, Subhashish
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Gamma Prime Precipitation Mechanisms and Solute Partitioning in Ni-base Alloys

Description: Nickel-base superalloys have been emerged as materials for gas turbines used for jet propulsion and electricity generation. The strength of the superalloys depends mainly from an ordered precipitates of L12 structure, so called gamma prime (γ’) dispersed within the disorder γ matrix. The Ni-base alloys investigated in this dissertation comprise both model alloy systems based on Ni-Al-Cr and Ni-Al-Co as well as the commercial alloy Rene N5. Classical nucleation and growth mechanism dominates the… more
Date: August 2014
Creator: Rojhirunsakool, Tanaporn
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Mobility of Source Zone Heavy Metals and Radionuclides: The Mixed Roles of Fermentative Activity on Fate and Transport of U and Cr. Final Report

Description: Various U. S. Department of Energy (DOE) low and medium-level radioactive waste sites contain mixtures of heavy metals, radionuclides and assorted organic materials. In addition, there are numerous sites around the world that are contaminated with a mixture of organic and inorganic contaminants. In most sites, over time, water infiltrates the wastes, and releases metals, radionuclides and other contaminants causing transport into the surrounding environment. We investigated the role of fermenta… more
Date: January 29, 2014
Creator: Gerlach, Robin; Peyton, Brent M. & Apel, William A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

PROBABILISTIC HAZARD ASSESSMENT FOR TORNADOES, STRAIGHT-LINE WIND, AND EXTREME PRECIPITATION AT THE SAVANNAH RIVER SITE

Description: Recent data sets for three meteorological phenomena with the potential to inflict damage on SRS facilities - tornadoes, straight winds, and heavy precipitation - are analyzed using appropriate statistical techniques to estimate occurrence probabilities for these events in the future. Summaries of the results for DOE-mandated return periods and comparisons to similar calculations performed in 1998 by Weber, et al., are given. Using tornado statistics for the states of Georgia and South Carolina,… more
Date: December 4, 2013
Creator: Werth, D.; Weber, A. & Shine, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dynamic Precipitation of Second Phase Under Deformed Condition in Mg-nd Based Alloy

Description: Magnesium alloys are the lightweight structural materials with high strength to weigh ratio that permits their application in fuel economy sensitive automobile industries. Among the several flavors of of Mg-alloys, precipitation hardenable Mg-rare earth (RE) based alloys have shown good potential due to their favorable creep resistance within a wide window of operating temperatures ranging from 150°C to 300°C. A key aspect of Mg-RE alloys is the presence of precipitate phases that leads to str… more
Date: December 2013
Creator: Dendge, Nilesh Bajirao
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Tank 26F-2F Evaporator Study

Description: Tank 26F supernate sample was sent by Savannah River Remediation to Savannah River National Laboratory for evaporation test to help understand the underlying cause of the recent gravity drain line (GDL) pluggage during operation of the 2F Evaporator system. The supernate sample was characterized prior to the evaporation test. The evaporation test involved boiling the supernate in an open beaker until the density of the concentrate (evaporation product) was between 1.4 to 1.5 g/mL. It was follow… more
Date: December 19, 2012
Creator: Adu-Wusu, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen