Digital Commons Network^™

Searching For Superspreaders Of Information In Real-World Social Media, Sen Pei, Lev Muchnik, José S. Andrade, Jr., Zhiming Zheng, Hernán A. Makse

Publications and Research

A number of predictors have been suggested to detect the most influential spreaders of information in online social media across various domains such as Twitter or Facebook. In particular, degree, PageRank, k-core and other centralities have been adopted to rank the spreading capability of users in information dissemination media. So far, validation of the proposed predictors has been done by simulating the spreading dynamics rather than following real information flow in social networks. Consequently, only model-dependent contradictory results have been achieved so far for the best predictor. Here, we address this issue directly. We search for influential spreaders by following …

Evaluation Of A New Method Of Fossil Retrodeformation By Algorithmic Symmetrization: Crania Of Papionins (Primates, Cercopithecidae) As A Test Case, Melissa Tallman, Nina Amenta, Eric Delson, Stephen R. Frost, Deboshmita Ghosh, Zachary S. Klukkert, Andrea Morrow, Gary J. Sawyer

Publications and Research

Diagenetic distortion can be a major obstacle to collecting quantitative shape data on paleontological specimens, especially for three-dimensional geometric morphometric analysis. Here we utilize the recently -published algorithmic symmetrization method of fossil reconstruction and compare it to the more traditional reflection & averaging approach. In order to have an objective test of this method, five casts of a female cranium of Papio hamadryas kindae were manually deformed while the plaster hardened. These were subsequently “retrodeformed” using both algorithmic symmetrization and reflection & averaging and then compared to the original, undeformed specimen. We found that in all cases, algorithmic retrodeformation improved …

On The Effects Of Competition Between Agent-Based Double Auction Markets, Kai Cai, Jinzhong Niu, Simon Parsons

Publications and Research

Real market institutions, stock and commodity exchanges for example, do not occur in isolation. The same stocks and commodities may be listed on multiple exchanges, and traders who want to deal in those goods have a choice of markets in which to trade. While there has been extensive research into agent-based trading in individual markets, there is little work on this kind of multiple market scenario. Our work seeks to address this imbalance, examining how standard economic measures, like allocative efficiency, are affected by the presence of multiple markets for the same good. We find that while dividing traders between …

Case Study: From Gummy Bears To Celery Stalks: Diffusion And Osmosis, Kevin M. Bonney

Publications and Research

The article describes a case study which interperses information on diffusion and osmosis with content review and knowledge application questions, as well as simple experiment that can be conducted without the use of a laboratory. Topics discussed include biological membranes, the use of gummy bears to demonstrate osmosis and osmosis in animal cells. Also mentioned is osmosis in plants. It notes that the case study was developed for use in an introductory undergraduate biology course.

The Create Strategy For Intensive Analysis Of Primary Literature Can Be Used Effectively By Newly Trained Faculty To Produce Multiple Gains In Diverse Students, Leslie M. Stevens, Sally G. Hoskins

Publications and Research

The CREATE (Consider Read, Elucidate the hypotheses, Analyze and interpret the data, and Think of the next Experiment) strategy aims to demystify scientific research and scientists while building critical thinking, reading/analytical skills, and improved science attitudes through intensive analysis of primary literature. CREATE was developed and piloted at the City College of New York (CCNY), a 4-yr, minority-serving institution, with both upper-level biology majors and first-year students interested in science, technology, engineering, and mathematics. To test the extent to which CREATE strategies are broadly applicable to students at private, public, research-intensive, and/or primarily undergraduate colleges/universities, we trained a cohort of …

Looking For Cosmic Neutrino Background, Chiaki Yanagisawa

Publications and Research

Since the discovery of neutrino oscillation in atmospheric neutrinos by the Super-Kamiokande experiment in 1998, study of neutrinos has been one of exciting fields in high-energy physics. All the mixing angles were measured. Quests for (1) measurements of the remaining parameters, the lightest neutrino mass, the CP violating phase(s), and the sign of mass splitting between the mass eigenstates m₃ and m₁, and (2) better measurements to determine whether the mixing angle θ₂₃ is less than π/4, are in progress in a well-controlled manner. Determining the nature of neutrinos, whether they are Dirac or Majorana particles …

Environmental Data Analysis And Remote Sensing For Early Detection Of Dengue And Malaria, Md Zahidur Rahman, Leonid Roytman, Abdelhamid Kadik, Dilara A. Rosy

Publications and Research

Malaria and dengue fever are the two most common mosquito-transmitted diseases, leading to millions of serious illnesses and deaths each year. Because the mosquito vectors are sensitive to environmental conditions such as temperature, precipitation, and humidity, it is possible to map areas currently or imminently at high risk for disease outbreaks using satellite remote sensing. In this paper we propose the development of an operational geospatial system for malaria and dengue fever early warning; this can be done by bringing together geographic information system (GIS) tools, artificial neural networks (ANN) for efficient pattern recognition, the best available ground-based epidemiological and …

Deriving High-Resolution Protein Backbone Structure Propensities From All Crystal Data Using The Information Maximization Device, Armando D. Solis

Publications and Research

The most informative probability distribution functions (PDFs) describing the Ramachandran phi-psi dihedral angle pair, a fundamental descriptor of backbone conformation of protein molecules, are derived from high-resolution X-ray crystal structures using an information-theoretic approach. The Information Maximization Device (IMD) is established, based on fundamental information-theoretic concepts, and then applied specifically to derive highly resolved phi-psi maps for all 20 single amino acid and all 8000 triplet sequences at an optimal resolution determined by the volume of current data. The paper shows that utilizing the latent information contained in all viable high-resolution crystal structures found in the Protein Data Bank (PDB), …

The Application Of Dispersion Staining And Infrared Microspectroscopy To Analyze Physical Evidence In Developing Countries, Thiti Mahacharoen

Dissertations, Theses, and Capstone Projects

In developing countries like Thailand and in remote forensic laboratories around the world, scientific investigations of crimes are limited by the shortage of trained personnel and financial resources. The premise of this research is that polarized light microscope and dispersion staining methods will be developed which allow investigators with limited training to analyze physical evidence at a minimal cost. This research identifies specific liquids for the analysis of trace evidence using the dispersion staining technique. The development of dispersion staining technique and identification of specific liquid will extend the application of forensic science to remote laboratories and in the field …

The Lived Experience Of Young Adult Burn Survivors' Use Of Social Media, Marie S. Giordano

Dissertations, Theses, and Capstone Projects

The purpose of this phenomenological study was to illuminate the meaning of social media use by young adult burn survivors. Five females and four males, aged 20-25, who sustained burns > 25%, were interviewed. Van Manen's (1999) phenomenological methodology provided the framework for this study. The meaning of the context of the lived experience is described in the five essential themes of identity, connectivity, social support, making meaning, and privacy. These young adult burn survivors, having experienced the traumatic effects of a burn during adolescence, use social media as a way of expressing their identity, while being cautious about privacy. Part …

Motor Imagery And Action Observation As An Alternative Gait Training Intervention For The Elderly, Matthew F. Cirelli, Brian Fettner, Lindita Ismaili, Danielle Jordan

Dissertations, Theses, and Capstone Projects

Motor imagery (MI) is the mental representation of movement without any body movement. Action observation (AO) is a non-physical method of training, in which the learner observes the action of another individual. Eighteen subjects between ages 60-80 were randomly assigned to 3 training groups, the MI, AO and motor training groups. All subjects were assessed and measured with the Expanded Timed-Get Up and Go (TUG) test and Figure-8-Walk (F8W) test. All three groups yielded a significant improvement in difference in total TUG time (<0.05). When individual aspects of the TUG were considered, the sit to stand component improved in the MI and Motor groups. The results of this study suggest that MI and AO can improve cadence and have an effect mirroring that of motor practice. If utilized properly, MI and AO may be indicated as a rehabilitation intervention adjunct to gait training, and potentially decrease the risk of falls in the elderly population.

Reading Cruft: A Cognitive Approach To The Mega-Novel, David J. Letzler

Dissertations, Theses, and Capstone Projects

Reading Cruft offers a new critical model in which to examine a genre vital to modern literature, the mega-novel. Building on theoretical work in both cognitive narratology and cognitive poetics, it argues that the mega-novel is primarily characterized by its inclusion of a substantial amount of pointless text ("cruft"), which it uses to challenge its readers' abilities to modulate their attention and rapidly shift their modes of text processing. Structured into five chapters respectively devoted to subgenres in which mega-novels have been grouped--the dictionary novel, the encyclopedic novel, the Menippean satire, the picaresque and frame-tale, and the epic and allegory--it …

Musical Landscapes: Theophile Gautier And The Evolution Of Nineteenth Century French Poetry, Dana Milstein

Dissertations, Theses, and Capstone Projects

Theophile Gautier's first edition of Emaux et camees (1852) marks the juncture at which Romantic, Neoclassical, and nascent Symbolist poetic theories converged under the umbrella ideology of "Parnassianism." Emaux et camees synthesizes the aesthetics promoted by these diverse groups, primarily by 1) using "musical" and "painterly" language, 2) emphasizing correspondences among arts, and 3) paradoxically demanding an attention to form and the artist's labor while also emphasizing art's inutility during a century characterized by Progress. Gautier's Emaux et camees bridges painterly and musical poetics to create a new model for poetry.

While the vocabulary of painting captivated many nineteenth century …

Metal Nanoparticles Immobilized On Basic Supports As Catalysts For Hydrogenation And Dehydrogenation Reactions Of Relevance To Cleaner Fossil Fuels And Alternative Sources Of Energy, Reena Rahi

Dissertations, Theses, and Capstone Projects

We developed a series of catalysts, composed of metal nanoparticles immobilized on basic supports for the hydrogenation of heteroaromatics of relevance to cleaner fossil fuels and biodiesel, and for the dehydrogenation of heteroaromatics of relevance to hydrogen storage in organic liquids. Our catalyst design involves nanostructured catalysts composed of metal particles immobilized on basic supports capable of ionic mechanism that may avoid catalyst poisoning and enhance catalytic activity.

We prepared a new catalyst composed of Pd nanoparticles immobilized on MgO by NaBH4 reduction of Na2PdCl4 in methanol in the presence of the support. TEM measurements revealed well-dispersed 1.7 nm Pd …

Initial Conditions In High-Energy Collisions, Elena Petreska

Dissertations, Theses, and Capstone Projects

This thesis is focused on the initial stages of high-energy collisions in the saturation regime. We start by extending the McLerran-Venugopalan distribution of color sources in the initial wave-function of nuclei in heavy-ion collisions. We derive a fourth-order operator in the action and discuss its relevance for the description of color charge distributions in protons in high-energy experiments. We calculate the dipole scattering amplitude in proton-proton collisions with the quartic action and find an agreement with experimental data. We also obtain a modification to the fluctuation parameter of the negative binomial distribution of particle multiplicities in proton-proton experiments. The result …

The Moral Philosophy Of William Wollaston, Yael Sofaer

Dissertations, Theses, and Capstone Projects

This dissertation provides the first thorough exposition of the moral theory proposed by William Wollaston in his treatise The Religion of Nature Delineated (1724), and demonstrates it to be an innovative contribution to the seventeenth and eighteenth centuries' project of developing a moral theory by reason alone (in which lie the origins of contemporary moral realism); with the foundational principle of acting in accordance with nature as the standard of morality. Wollaston's treatise contains an unrecognized innovation: the principle that rational agents express propositions by their actions--that, as propositions, have truth values--which makes it possible to determine the moral status …

Variation In Habitat Thresholds: An Analysis Of Minimum Habitat Requirements Of North American Breeding Birds, Yntze Van Der Hoek

Dissertations, Theses, and Capstone Projects

Many species show dramatic changes in population extinction or persistence probability at particular habitat amounts. These `extinction thresholds' could be translated to conservation targets, under the condition that we can derive generalities. I investigated the level of variation in landscape-level habitat thresholds for a suite of North American, forest-associated, breeding birds. Records from Breeding Bird Atlases and the availability of remotely-sensed land cover data allowed me to compare habitat thresholds for 25 species across the states of Massachusetts, Michigan, New York, Ohio, Pennsylvania, and Vermont. I show that variation in thresholds is considerable (Chapter II, III), as thresholds range from …

Mind, Media, And Techniques Of Remediation In America, 1850-1910, Dominique Zino

Dissertations, Theses, and Capstone Projects

This dissertation describes the way a renewed interest in picturesque aesthetics engaged the imaginations of writers, visual artists, philosophers, landscape designers, and collectors during the second half of the nineteenth century, reinvigorating a mode of inquiry that sanctioned the act of composing representations--mental, visual, and verbal--as a suitable response to social, political, and philosophical problems. The chapters that follow describe the understanding of the relationship between language, visual representation, and feeling that picturesque aesthetics formalized alongside the surface discourse of picturesqueness that was circulating through everyday genres, such as illustrated viewbooks, by the second half of the century. This dynamic …

Women In Foreclosure: Social Reproduction & Mortgage Strain In The Subprime Era, Amy Baker

Dissertations, Theses, and Capstone Projects

Advisor: Professor Mimi Abramovitz

This research captures the experiences of 31 single female homeowners with risky lending markets and mortgage foreclosure in the city of Philadelphia. In-depth, semi-structured interviewing was employed to build knowledge about single women's experiences with seeking a loan, buying a home, entering default and attempting to stall foreclosure. Thematic analysis of the data demonstrated that risky lending and foreclosure did not mark the onset of financial instability among study participants. Instead, it functioned as a tipping point for single women unable to access upward mobility and asset accrual throughout the lifespan. Women's status as the strongest …

Evolution And Ethics, Franklin Roy Bennett

Dissertations, Theses, and Capstone Projects

Does evolution inform the ancient debate about the roles that instinct (emotion/passion/sentiment/feeling) and reason do and/or should play in how we decide what to do? Evolutionary ethicists typically adopt Darwinism as a suitable explanation for evolution, and on that basis draw conclusions about moral epistemology. However, if Darwinism is to be offered as a premise from which conclusions about moral epistemology are drawn, in order to assess such arguments we must assess that premise. This reveals the highly speculative and metaphysical quality of our theoretical explanations for how evolution happens. Clarifying that helps to facilitate an assessment of the epistemological …

Dynamics And Manipulation Of Nanomagnets, Liufei Cai

Dissertations, Theses, and Capstone Projects

This thesis presents my work on the spin dynamics of nanomagnets and investigates the possibility of manipulating nanomagnets by various means. Most of the work has been published\cite{LC-PRB2010, LC-PRB2012, LC-PRB2013, LC-EPL2014}. Some has been submitted for publication\cite{LC-arxiv2014}. The structure of this thesis is as follows.

In Chapter 1, I present the theory of manipulation of a nanomagnet by rotating ac fields whose frequency is time dependent. Theory has been developed that maps the problem onto Landau-Zener problem. For the linear frequency sweep the switching phase diagrams are obtained on the amplitude of the ac field and the frequency sweep rate. …

A Parent At War And The "Invisible Wounds" They Carry Home: Ptsd In Military Veterans And A Review Of Psychosocial Family System Challenges, Melina Sofia Calle

Dissertations, Theses, and Capstone Projects

Operation Enduring Freedom and Operation Iraqi Freedom have created a new generation of military veterans and military families, many of which must manage and cope with psychosocial challenges such as posttraumatic stress, depression, anxiety, and alcohol abuse induced by the psychological trauma(s) faced during war. Risk factors, buffering factors, and war zone stressors influencing the development of PTSD following military-related trauma will be reviewed. As many of these affected veterans return to living with spouses and children, these psychosocial issues show to bring forth tension, stress, and friction to the family system. This thesis explores the literature of family system …

Temporal Information Extraction And Knowledge Base Population, Taylor Cassidy

Dissertations, Theses, and Capstone Projects

Temporal Information Extraction (TIE) from text plays an important role in many Natural Language Processing and Database applications. Many features of the world are time-dependent, and rich temporal knowledge is required for a more complete and precise understanding of the world. In this thesis we address aspects of two core tasks in TIE. First, we provide a new corpus of labeled temporal relations between events and temporal expressions, dense enough to facilitate a change in research directions from relation classification to identification, and present a system designed to address corresponding new challenges. Second, we implement a novel approach for the …

Yang-Mills Theories As Deformations Of Massive Integrable Models, Axel Cortes Cubero

Dissertations, Theses, and Capstone Projects

Yang Mills theory in 2+1 dimensions can be expressed as an array of coupled (1+1)-dimensional principal chiral sigma models. The SU(N) principal chiral sigma model in 1+1 dimensions is integrable, asymptotically free and has massive excitations. We calculate all the form factors and two- point correlation functions of the Noether current and energy-momentum tensor, in

't Hooft's large-N limit (some form factors can be found even at finite N). We use these new form factors to calculate physical quantities in (2+1)-dimensional Yang-Mills theory, generalizing previous SU(2) by P. Orland to SU(N). The anisotropic gauge theory is related to standard isotropic …

The Role Of Water In The Rise, Prominence, And Decline Of Nabataean Petra, Dennis Cummins

Dissertations, Theses, and Capstone Projects

This paper evaluates the rise of Nabataean Petra, its prominence, and eventual decline. The predominant context is effective water management as a pivotal driving factor in the growth of the Nabataean kingdom, which fostered an environment in which its famous incense trade could develop. Rising incense demand was the catalyst for growth from the first century BC through the first century AD; in AD 106 when Rome annexed the Nabataean kingdom, Petra began its gradual decline. In AD 363 an earthquake destroyed much of the city, and Petra did not return to its earlier prominence. From the outset, water played …

Recruitment Of The Ribosomal 40s Subunit To The 3'Untranslated Region Of A Viral Mrna, Via The Eif4 Complex, Facilitates Cap-Independent Translation, Sohani Das Sharma

Dissertations, Theses, and Capstone Projects

Translation of uncapped plant viral RNAs can be facilitated by either an internal ribosomal entry site (IRES) in the 5' untranslated region (UTR) or a cap-independent translation element (CITE) in the 3' UTR. Barley yellow dwarf virus (BYDV) mRNA, which lacks both cap and poly(A) tail, has a translation element (3'BTE) in its 3' UTR that is essential for efficient translation initiation at the 5'-proximal AUG. This mechanism requires binding of the eukaryotic initiation factor 4G (eIF4G) subunit of the heterodimer eIF4F to the 3'BTE and base pairing between the 3'BTE and the 5' UTR. Here we investigate how this …

Speech Act Theoretic Semantics, Daniel W. Harris

Dissertations, Theses, and Capstone Projects

I defend the view that linguistic meaning is a relation borne by an expression to a type of speech act, and that this relation holds in virtue of our overlapping communicative dispositions, and not in virtue of linguistic conventions. I argue that this theory gives the right account of the semantics-pragmatics interface and the best-available semantics for non-declarative clauses, and show that it allows for the construction of a rigorous compositional semantic theory with greater explanatory power than both truth-conditional and dynamic semantics.

The Asymptotic Dirichlet Problems On Manifolds With Unbounded Negative Curvature, Ran Ji

Dissertations, Theses, and Capstone Projects

Elton P. Hsu used probabilistic method to show that the asymptotic Dirichlet problem is uniquely solvable if the curvature satisfies the condition $-C e^{(2-\eta)r(x)} \leq K_M(x)\leq -1$ with $\eta>0$. We give an analytical proof of the same statement. In addition, using this new approach we are able to establish two boundary Harnack inequalities under the curvature condition $-C e^{(2/3-\eta)r(x)} \leq K_M(x)\leq -1$ with $\eta>0$. This implies that there is a natural homeomorphism between the Martin boundary and the geometric boundary of $M$. As far as we know, this is the first result of this kind under unbounded curvature …

Successful Aging: Use Of Communication Technology In An Adult Day Program, Wendy Johnson

Dissertations, Theses, and Capstone Projects

This dissertation investigated the relationship between learning digital communication technologies in an intergenerational intervention and successful aging among older adults. The specific goal of this study was to uncover the effects of this intervention on the cultural constructions of aging in an urban Adult Day Program in Trinidad and Tobago. This mixed method study utilized the Geriatric Depression Scale (GDS; Sheikh & Yesavage, 1986), a life satisfaction scale, well-being measurements, open-ended survey questionnaires and a focus group session. The results from the quantitative items indicated no significant differences after the intervention; however, the focus group discussion and open-ended surveys provided …

Exploring Platform (Semi)Groups For Non-Commutative Key-Exchange Protocols, Ha Lam

Dissertations, Theses, and Capstone Projects

In this work, my advisor Delaram Kahrobaei, our collaborator David Garber, and I explore polycyclic groups generated from number fields as platform for the AAG key-exchange protocol. This is done by implementing four different variations of the length-based attack, one of the major attacks for AAG, and submitting polycyclic groups to all four variations with a variety of tests. We note that this is the first time all four variations of the length-based attack are compared side by side. We conclude that high Hirsch length polycyclic groups generated from number fields are suitable for the AAG key-exchange protocol.

Delaram Kahrobaei …