Physical Sciences and Mathematics Commons^™

A First Look At Global News Coverage Of Disasters By Using The Gdelt Dataset, Haewoon Kwak, Jisun. An

Research Collection School Of Computing and Information Systems

In this work, we reveal the structure of global news coverage of disasters and its determinants by using a large-scale news coverage dataset collected by the GDELT (Global Data on Events, Location, and Tone) project that monitors news media in over 100 languages from the whole world. Significant variables in our hierarchical (mixed-effect) regression model, such as population, political stability, damage, and more, are well aligned with a series of previous research. However, we find strong regionalism in news geography, highlighting the necessity of comprehensive datasets for the study of global news coverage.

Web Application Vulnerability Prediction Using Hybrid Program Analysis And Machine Learning, Lwin Khin Shar, Lionel Briand, Hee Beng Kuan Tan

Research Collection School Of Computing and Information Systems

Due to limited time and resources, web software engineers need support in identifying vulnerable code. A practical approach to predicting vulnerable code would enable them to prioritize security auditing efforts. In this paper, we propose using a set of hybrid (staticþdynamic) code attributes that characterize input validation and input sanitization code patterns and are expected to be significant indicators of web application vulnerabilities. Because static and dynamic program analyses complement each other, both techniques are used to extract the proposed attributes in an accurate and scalable way. Current vulnerability prediction techniques rely on the availability of data labeled with vulnerability …

Band Selection For Hyperspectral Images Using Probabilistic Memetic Algorithm, Liang Feng, Ah-Hwee Tan, Meng-Hiot Lim, Si Wei Jiang

Research Collection School Of Computing and Information Systems

Band selection plays an important role in identifying the most useful and valuable information contained in the hyperspectral images for further data analysis such as classification, clustering, etc. Memetic algorithm (MA), among other metaheuristic search methods, has been shown to achieve competitive performances in solving the NP-hard band selection problem. In this paper, we propose a formal probabilistic memetic algorithm for band selection, which is able to adaptively control the degree of global exploration against local exploitation as the search progresses. To verify the effectiveness of the proposed probabilistic mechanism, empirical studies conducted on five well-known hyperspectral images against two …

Perspectives On Task Ownership In Mobile Operating System Development [Invited Talk], Subhajit Datta

Research Collection School Of Computing and Information Systems

There can be little contention about Stroustrup's epigrammatic remark: our civilization runs on software. However a caveat is increasingly due, much of the software that runs our civilization, runs on mobile devices today. Mobile operating systems have come to play a preeminent role in the ubiquity and utility of such devices. The development ecosystem of Android - one of the most popular mobile operating systems - presents an interesting context for studying whether and how collaboration dynamics in mobile development differ from conventional software development. In this paper, we examine factors that influence task ownership in Android development. Our results …

Constraints On The Emplacement Age Of The Heart Mountain Slide, Northwestern Wyoming, D. Malone, John Craddock, M. Anders, A. Wulff

John Craddock

No abstract provided.

A New Family Of Nonexchangeable Copulas For Positive Dependence, Roy Cerqueti, Claudio Lupi

Claudio Lupi

Composition And Optical Properties Of Secondary Organic Aerosol Particles, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling

Matthew E. Wise

No abstract provided.

Optical Properties Of Secondary Organic Aerosols, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling

Matthew E. Wise

Composition Of Secondary Organic Aerosols, Ryan Caylor, Felisha Imholt, Matthew E. Wise, John Shilling

Matthew E. Wise

Plasma Focus Device As A Breeder Of 14.66 Mev Protons To Produce Short-Lived Radioisotopes, A. Zaeem, S.M. Kaia, M. Sedaghatizadeh, Ahmad Talaei

Ahmad Talaei

In plasma focus devices filled deuterium gas with low pressure admixture gas, 3He, the deuterium creates high energy protons of 14.66 MeV through the 3He(d, p) 4He(Q = 18.35 MeV) fusion reaction. This reaction takes place due to the thermal and non-thermal (beam-target) mechanisms. The proton yield production for deuterium filling gas is determined by using the beam-target character of the pinched plasma and moving boiler model. If we use a low pressure admixture gas like 11B, these high energy protons in turn, could generate short-lived radioisotopes like 11C (used in positron emission tomography) via the …

Influence Of Admixture Gas On The Enhancement Of Neutron Production In Plasma Focus Devices, Ahmad Talaei, S.M. Kaia

Ahmad Talaei

In this article, considering the most important interactions between the ionized admixture particles and the working plasma ones, we have analyzed the effect of added gas on the current and confinement time of the pinched plasma in plasma focus devices. Moreover, we demonstrate how heating and cooling the pinched plasma can be controlled by the increase and decrease on the percentage of the added particles and by this way the rise in the rate of D–D nuclear reactions is calculated.

Theoretical Study Of The Endogenous Production Of N-13 In 115 Kj Plasma Focus Device Using Methane Gas, Saeedeh Haghani, A. Sadighzadeh, Ahmad Talaei, A. Zeem, S.M. Kiai, A. Heydarnia, V. Damideh

Ahmad Talaei

Mather type plasma focus device with the bank energy of 115 kJ (40 kV, 144μF) was studied for induced activity of N-13; a short-lived radioisotope β+ emitter with 511 keV of gamma rays and has a half-life of t1/2 = 9.93 min through 12C (d, n)13N nuclear reaction. N-13 radioisotope is used in Positron Emission Tomography (PET) for imaging and treatment. In this paper endogenous production of 13N is considered. It is shown by adding 3–4 % CH4 to the chamber, the induced activity of N-13 has increased about 4 %. Our study is representative of producing 106 − 109 …

Study The Output Characteristics Of A 90 Kj Filippove-Type Plasma Focus, S.M. Kiai, Ahmad Talaei, Et Al.

Ahmad Talaei

The output characteristics of a Filippove-Type plasma focus “Dena” (288 μF, 25 kV, 90 kJ) is numerically investigated by considering the voltage, current, current derivative, and maximum current as a function of capacitor bank energy in the constant Argon gas pressure and compared to the experiment. It is shown that increase on the bank energy leads to the increment on the maximum current and decrement on the pinch time.

Effects Of Admixture Gas On The Production Of 18f Radioisotope In Plasma Focus Devices, Ahmad Talaei, S.M. Kaia, A. Zeem

Ahmad Talaei

In this article, the effect of admixture gas on the heating and cooling of pinched plasma directly related to the enhancement or reduction of ¹⁸F production through the ¹⁶O(³He, p)¹⁸F is considered in the plasma focus devices. It is shown that by controlling the velocity of added Oxygen particles mixed with the working helium gas into the plasma focus chamber, one can increase the current and decrease the confinement time (plasma heating) or vice verse (plasma cooling). The highest level of nuclear activities of ¹⁸F was found around 16% of the Oxygen admixture …

Study The Influence Of The Bank Energy On The Dynamical Pinch In Plasma Focus, Ahmad Talaei, S.M. Kaia

Ahmad Talaei

The plasma focus discharge can generate, accelerate and pinch the plasma up to high density and temperature in a pulsed mode manner. Applications aspects of discharge require high efficiency of the fusion products. This situation acquires optimized operational parameters for the proper discharge. In this article, we have studied the plasma parameters and neutron performance dependency on bank energy. First, analytical expressions are derived from the equation of motion for the plasma particles in the radial phase. Then, the related fusion neutrons, both thermal and non-thermal, together with the discharge anisotropy in the low pressure regimes for the ‘Dena’ plasma …

Pinched Plasma Study In A Filippov-Type Plasma Focus “Dena”, Ahmad Talaei, S. Kaia, S. Adlparvar

Ahmad Talaei

A characteristic feature of physical processes occurring in pinched plasma is their tendency to generate thermal and nonthermal emissions. In this case, the roles played by plasma compression dynamics such as pinch formation, pinch disruption, expansion, etc., are predominant. In this paper, first, we present some of the experimental results concerning the thermal and nonthermal neutron emissions. Then, a new approach based on some theoretical assumptions and the experimental data for which the pinched plasma density evolution was studied are introduced. In the new approach, the compression dynamics are divided into two phases: plasma compression (thermal) and plasma expansion (nonthermal). …

Development Of Practical Method Using A Monte Carlo Code For Evaluation Of Optimum Fuel Pitch In A Typical Vver-1000 Core, Navid Taheranpoura, Ahmad Talaei

Ahmad Talaei

In this work, we developed a practical method to evaluate the optimum moderator-to-fuel ratio of a typical VVER reactor using a Monte Carlo code. To reach this aim, by analyzing the curves of the infinite multiplication factor (k_∞) versus moderator-to-fuel ratio, the optimum fuel pitch is determined for different fuel diameters of the proposed fuel elements using the MCNPX code. Optimum moderator-to-fuel ratio and fuel pitch were determined from the curves where the value of k_∞ is maximum for cold conditions and is located in an under-moderated region for hot conditions. Also, the void reactivity coefficient …

Investigation Of The High Pressure Regimes Effects On The Neutron Production In Plasma Focus, Ahmad Talaei, S.M. Kaia

Ahmad Talaei

Effects of high pressure regimes on the thermal mechanism of neutron yield and anisotropy factor with respect to the capacitor bank energy are presented by using moving boiler model. It is found that at high pressures, the thermal fusion reactions have a considerable effect on the neutron yield and anisotropy factor. We have compared the manner of the anisotropy in two low and high pressure discharges to investigate different behavior of the anisotropy factor as a function of bank energy in the difference working regimes of pressure for Dena PF.

Combining Observations And Numerical Model Results To Improve Estimates Of Hypoxic Volume Within Chesapeake Bay, Usa, A. J. Bever, M. A.M. Friedrichs, C. T. Friedrichs, M. E. Scully

Presentations

No abstract provided.

The Development And The Capabilities Of The Community Sediment Transport Modeling System (Cstms) For The York River Estuary, Virginia, Danielle Tarpley, K. Fall, Courtney K. Harris, Carl T. Friedrichs

Presentations

No abstract provided.

Text Analytics Of Social Media: Sentiment Analysis, Event Detection And Summarization, Chao Shen

FIU Electronic Theses and Dissertations

In the last decade, large numbers of social media services have emerged and been widely used in people's daily life as important information sharing and acquisition tools. With a substantial amount of user-contributed text data on social media, it becomes a necessity to develop methods and tools for text analysis for this emerging data, in order to better utilize it to deliver meaningful information to users.

Previous work on text analytics in last several decades is mainly focused on traditional types of text like emails, news and academic literatures, and several critical issues to text data on social media have …

Remote Sensing And Ground-Based Weather Forcing Data Analysis For Streamflow Simulation, José Alberto Infante Corona, Tarendra Lakhankar, Soni M. Pradhanang, Reza Khanbilvardi

Publications and Research

Hydrological simulation, based on weather inputs and the physical characterization of the watershed, is a suitable approach to predict the corresponding streamflow. This work, carried out on four different watersheds, analyzed the impacts of using three different meteorological data inputs in the same model to compare the model’s accuracy when simulated and observed streamflow are compared. Meteorological data from the Daily Global Historical Climatology Network (GHCN-D), National Land Data Assimilation Systems (NLDAS) and the National Operation Hydrological Remote Sensing Center’s Interactive Snow Information (NOHRSC-ISI) were used as an input into the Soil and Water Assessment Tool (SWAT) hydrological model and …

Cross-Disciplinary Sciences At Gettysburg College: Second Annual Poster Presentation, X-Sig

Student Publications

This booklet includes Biology student presentations by: Taylor Bury, Abigail Dworkin-Brodsky, Mary Pearce, Jasper Leavitt, Morgan Panzer, Ellen Petley, Kalli Qutub, Taylor Randell, Samantha Eck, Lana McDowell, Jenn Soroka, Celina Harris, Natalie Tanke, Alexandra Turano, and Caroline Garliss.

This booklet includes Biochemistry & Molecular Biology student presentations by: Matthew Dunworth, Andrew Sydenstricker, Brianne Tomko, Albert Vill, Warren Campbell, David Van Doren, Kevin Mrugalski, Stacey Heaver, Alecia Achimovich, and Katherine Boas.

This booklet includes Chemistry student presentations by: Kristen Baker, Laura Lee, Kathryn Fodale, Daniel Ruff, Michael Counihan, Ida DiMucci, Joshua Sgroi, Celina Harris, and Natalie Tanke.

This booklet include Health …

Potential Effects Of Changing Climate On The Physical, Chemical, And Biological Characteristics Of Alpine Lakes, Uinta Mountains, Utah, Usa, Shirley Ngai

Electronic Thesis and Dissertation Repository

Relationships between climate variables, lake characteristics and diatom community composition were determined for five lakes in the Uinta Mountains, Utah (USA) from spring 2010 to autumn 2013 to provide information to help predict the effects of climate change on lake ecosystems. Surface water temperatures increased with decreasing elevation although microclimates affected this relationship. Deeper water temperatures increased or stayed the same with increasing elevation, probably due to greater transparency or convective heating. Total phosphorus (TP) and chl a concentrations decreased in the spring/summer with warmer fall/winter temperatures, and nitrates in the spring increased with increased fall/winter precipitation. A significant correlation …

The Fierce Green Fire: Vol 5 Issue 8, Wofford College Environmental Studies Program

The Fierce Green Fire

No abstract provided.

The Santa Clara, 2014-10-30, Santa Clara University

The Santa Clara

No abstract provided.

New Bivariate Lifetime Distributions Based On Bath-Tub Shaped Failure Rate, Mengying Li

FIU Electronic Theses and Dissertations

A class of lifetime distributions which has received considerable attention in modelling and analysis of lifetime data is the class of lifetime distributions with bath-tub shaped failure rate functions because of their extensive applications. The purpose of this thesis was to introduce a new class of bivariate lifetime distributions with bath-tub shaped failure rates (BTFRFs). In this research, first we reviewed univariate lifetime distributions with bath-tub shaped failure rates, and several multivariate extensions of a univariate failure rate function. Then we introduced a new class of bivariate distributions with bath-tub shaped failure rates (hazard gradients). Specifically, the new class of …

Magnetometer Surveys: Attempts And Issues In Locating A 1948 Private Water Well On The Shore Of Lac Sault Dore, Price County, Wisconsin, Kenneth R. Neuhauser, Kristopher J. Neuhauser

The Compass: Earth Science Journal of Sigma Gamma Epsilon

Two different magnetometer surveys in northern Wisconsin during the summers of 1997 and 2010, using two different Geometrics magnetometers, a proton precession G-816 unit and a cesium vapor G-858 unit, in an attempt to locate a surface-target position of, and depth to, an abandoned 1948 private water well, successfully targeted the suspect surface position and the depth to the well head spike. Both surveys detected 400-gamma anomalies and estimated the depth to the spike at 2 meters. A land owner, private family photograph taken in 1951, was used to compare the anomaly’s position to the actual surface position of the …

Timed/Saber Satellite Investigations Of Mesospheric Gravity Wave Variances Over The Andes, Jonathan Pugmire, Michael J. Taylor, Yucheng Zhao, Dominique Pautet, James Russell

Graduate Student Presentations

Focusing on data from the SABER instrument aboard the TIMED satellite temperature variances are determined as a function of altitude to quantify small scale gravity waves. This was done using IDL software to extract all the temperature profile measurements that were measured by SABER within a limited geographical area, centered on our ground-based optical imager at Cerro Pachon, Chile (30.3°S, 70.7°S). Then large-scale tidal waves, with wavenumbers 0-6, were removed from each profile revealing the gravity wave perturbations. The temperature variance were computed and recorded at several altitudes. Temperature variances reveal possible increased activity due to mountain waves. Mountain waves …

Sigma Gamma Epsilon 2014 Quality Awards, Paula Even

The Compass: Earth Science Journal of Sigma Gamma Epsilon

The Quality Chapter Award for Sigma Gamma Epsilon was established in 2010 to recognize chapters for achieving excellence by providing a quality program to its members. The 2014 recipients are announced and the qualifying criteria for the award are listed.