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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Characterizing The Turbulent Structure Of The Cbl And The Entrainment, Wei Jia
Characterizing The Turbulent Structure Of The Cbl And The Entrainment, Wei Jia
Undergraduate Research Posters 2018
The convective boundary layer (CBL) is the lowest part of the atmosphere. The turbulent motions in the CBL are important for redistributing trace gases, particles, heat, and momentum between the surface and the free troposphere thus it is important that this process is properly represented in numerical models that attempts to simulate the atmosphere. This study is trying to characterize the water vapor structure in the quasi-stationary CBL, using statistical way to build the turbulent model and uses a high resolution model: Large Eddy Simulation (LES) to investigate the adequacy of the model. We found that the water vapor flux …
Determining Cloud Cover With Machine Learning, Sarah Sesek
Determining Cloud Cover With Machine Learning, Sarah Sesek
Undergraduate Research Posters 2018
The cloud cover provided by boundary layer cumulus clouds is one of the greatest uncertainties in climate and weather prediction models. It is difficult with current technology to cheaply and accurately collect cloud cover data. The TSI (Total Sky Imager) provides a hemispheric field of view in order to maximize the area it can see. The farther away from the center of the image, the more angled the view of the the cloud is. Therefore, more of the side of the cloud is captured in addition to the cloud base. Machine learning is well suited to seeing through this bias. …
Investigating The Influence Of Cloud Size On Cumulus Cloud Entrainment, Theresa Lincheck
Investigating The Influence Of Cloud Size On Cumulus Cloud Entrainment, Theresa Lincheck
Undergraduate Research Posters 2018
Clouds play a crucial role in determining the weather on local and global scales, yet their complexity accounts for some of the largest uncertainties in weather forecasts and climate models. Environmental air mixing or being drawn into a current, called entrainment, is one source to blame for this complexity. When air entrains into a cloud evaporation of in-cloud condensates increase and temperatures in the cloud drop, reducing buoyancy. The overall effect of entrainment inhibits a cloud’s development, and usually results in the dissipation of a cloud. With the use of data generated from a high-resolution computer model known as Large …
An Alternative Means For Observation-Based Cloud Size Distributions, Adam Stead
An Alternative Means For Observation-Based Cloud Size Distributions, Adam Stead
Undergraduate Research Posters 2018
Clouds are a poorly understood phenomenon that have a significant impact on climate and day-to-day weather. This research aims to measure cloud size distributions for shallow cumulus clouds from observational data. Clouds are sampled via a ceilometer, which indicates both the presence of cloudy air and the base height of the respective cloud. When combining this data with the recorded horizontal wind velocity, we can infer a cloud transect size distribution. After sufficient sampling, we can use an algorithm to deduce an approximate cloud area distribution for the specified time range and cloud field. Once the cloud size distributions are …
Boundary Effects On The Locomotion Of Active Janus Particles, Marola W. Issa, Nicky R. Baumgartner
Boundary Effects On The Locomotion Of Active Janus Particles, Marola W. Issa, Nicky R. Baumgartner
Undergraduate Research Posters 2018
Self-propelled or “active” micrometer scale particles are capable of supplying local mechanical work, necessary for microscale cargo delivery and useful in other applications within bioimaging and sensing. Research in the last decade has focused on developing, measuring, and manipulating the locomotion mechanisms of active particles in simple environments. However, many applications will be in complex environments with nearby boundaries or variations in physiochemical cues. This poster reports the directed motion of platinum coated polystyrene particles at infinite dilution in the presence of H2O2, which acts as a fuel to drive motion. A transport mechanism called “diffusiophoresis” drives motion of the …
P1: How High Does The Lower Atmosphere Go?, Vladimir Sworski, Justin Flaherty
P1: How High Does The Lower Atmosphere Go?, Vladimir Sworski, Justin Flaherty
Undergraduate Research Posters 2017
The Atmospheric Boundary Layer (ABL), consisting of the bottom few kilometers of the troposphere, is a region with strong mixing of moisture and winds. This region's activity has a large impact on weather and climate models. In this study, we use a high resolution computer model: Large Eddy Simulation (LES). Statistics produced require a strong understanding of the height of the ABL. The purpose of this study was to create a method for determining this height accurately and consistently, as previous models demonstrated significant error.
Improving The Development Of The I-Chart For Use In Biopharmaceutical Manufacturing Operation, Kimberly Schveder
Improving The Development Of The I-Chart For Use In Biopharmaceutical Manufacturing Operation, Kimberly Schveder
Undergraduate Research Posters 2017
The Shewhart control chart is a statistical tool used by pharmaceutical companies, as well as chemical and other batch manufacturers, to help detect errors in the manufacturing process and ensure control of product quality. One particular type of control chart is the I-chart. The average run length (ARL) statistic of the I-chart can easily be determined when output from the manufacturing process is normally distributed with known population parameters. This paper investigates the impact on the ARL statistic when the I-chart is based on mean and standard deviation estimates obtained from small sample sizes of less than 50 batches. The …
P2: Reconciling Linear Measurements Of Fractal Cloud Structures, Nicholas Barron
P2: Reconciling Linear Measurements Of Fractal Cloud Structures, Nicholas Barron
Undergraduate Research Posters 2017
Clouds are a large unknown in meteorological predictions. Most of the issue can be derived from the odd shape of clouds. So, in order to correct the measurements of clouds, a thorough investigation of fractal cloud structures must be performed. Using the results from this study, a reconciliation method can then be constructed and applied to linear measurements of clouds.
P3: What Determines The Shape Of A Cloud?, William Calabrase
P3: What Determines The Shape Of A Cloud?, William Calabrase
Undergraduate Research Posters 2017
Current climate models and weather forecasts suffer due to an uncertainty associated with the behavior of clouds, which directly impact the energy exchange between the earth and the Sun. This impact is determined in part by the shape of the clouds, thereby making the study of what affects cloud shape an area of interest. To characterize the shape of cumulus clouds we study the behavior of the cloud overlap ratio, or the ratio between the average cloud fraction and projected cloud cover. In this study, we used a high resolution computer model to 1) determine how the cloud overlap ratio …