Digital Commons Network^™

Universality And Quantum Criticality In Quasiperiodic Spin Chains, Utkarsh Agrawal, Sarang Gopalakrishnan, Romain Vasseur

Publications and Research

Quasiperiodic systems are aperiodic but deterministic, so their critical behavior differs from that of clean systems and disordered ones as well. Quasiperiodic criticality was previously understood only in the special limit where the couplings follow discrete quasiperiodic sequences. Here we consider generic quasiperiodic modulations; we find, remarkably, that for a wide class of spin chains, generic quasiperiodic modulations flow to discrete sequences under a real-space renormalization-group transformation. These discrete sequences are therefore fixed points of a functional renormalization group. This observation allows for an asymptotically exact treatment of the critical points. We use this approach to analyze the quasiperiodic Heisenberg, …

Optically Pumped Spin Polarization As A Probe Of Many-Body Thermalization, Daniela Pagliero, Pablo R. Zangara, Jacob Henshaw, Ashok Ajoy, Rodolfo H. Acosta, Jeffrey A. Reimer, Alexander Pines, Carlos A. Meriles

Publications and Research

Disorder and many body interactions are known to impact transport and thermalization in competing ways, with the dominance of one or the other giving rise to fundamentally different dynamical phases. Here we investigate the spin diffusion dynamics of ¹³C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers. We focus on low-abundance, strongly hyperfine-coupled nuclei, whose role in the polarization transport we expose through the integrated impact of variable radio-frequency excitation on the observable bulk ¹³C magnetic resonance signal. Unexpectedly, we find good thermal contact throughout the nuclear spin bath, …

The New Realism Of The Roman: Friedrich Schlegel’S Theory Of The Novel And Byron’S Don Juan, Laura H. Clarke

Publications and Research

The complex question of genre in Byron’s Don Juan is often discussed in terms of the epic, but critics are increasingly turning to the novel to address the puzzling questions that remain about the generic status of Byron’s last work.1In The English Novel: A Panorama, Lionel Stevenson contends that Byron’s Don Juan belongs “essentially in the central tradition of the English novel, with its satirical realism, its picaresque series of adventures, and its complex panorama of contemporary society. Even the digressive comments are in the manner of Fielding.”2Stevenson exclaims,“One cannot help but thinking that if Byron had lived longer he …

Winding Numbers And Full Extendability In Holomorphic Motions, Yunping Jiang

Publications and Research

We construct an example of a holomorphic motion of a five-point subset of the Riemann sphere over an annulus such that it satisfies the zero winding number condition but is not fully extendable.

A Single, Narrowly Focused Create Primary Literature Module Evokes Gains In Genetics Students’ Self-Efficacy And Understanding Of The Research Process, Alison Krufka, Kristy Kenyon, Sally G. Hoskins

Publications and Research

Exposure to primary literature using CREATE tools has been shown to have a positive impact on students’ self-efficacy and beliefs when incorporated into semester-long courses taught by extensively trained faculty. However, it is unknown whether similar benefits can occur with a brief exposure to CREATE in an otherwise traditionally taught course. We hypothesized that students who experienced a short-term CREATE module taught by faculty with minimal training in this pedagogy would make gains in scientific literacy and self-efficacy while also experiencing epistemological maturation. To test this hypothesis, we compared sections of students who experienced the CREATE module with sections of …

An Empirical Study On The Use And Misuse Of Java 8 Streams, Raffi Khatchadourian, Yiming Tang, Mehdi Bagherzadeh, Baishakhi Ray

Publications and Research

Streaming APIs allow for big data processing of native data structures by providing MapReduce-like operations over these structures. However, unlike traditional big data systems, these data structures typically reside in shared memory accessed by multiple cores. Although popular, this emerging hybrid paradigm opens the door to possibly detrimental behavior, such as thread contention and bugs related to non-execution and non-determinism. This study explores the use and misuse of a popular streaming API, namely, Java 8 Streams. The focus is on how developers decide whether or not to run these operations sequentially or in parallel and bugs both specific and tangential …

An Empirical Study On The Use And Misuse Of Java 8 Streams, Raffi Khatchadourian, Yiming Tang, Mehdi Bagherzadeh, Baishakhi Ray

Publications and Research

Streaming APIs allow for big data processing of native data structures by providing MapReduce-like operations over these structures. However, unlike traditional big data systems, these data structures typically reside in shared memory accessed by multiple cores. Although popular, this emerging hybrid paradigm opens the door to possibly detrimental behavior, such as thread contention and bugs related to non-execution and non-determinism. This study explores the use and misuse of a popular streaming API, namely, Java 8 Streams. The focus is on how developers decide whether or not to run these operations sequentially or in parallel and bugs both specific and tangential …

Estimating Population Immunity Without Serological Testing, Andrew Lesniewski

Publications and Research

We propose an approximate methodology for estimating the overall level of immunity against COVID-19 in a population that has been affected by the recent epidemic. The methodology relies on the currently available mortality data and utilizes the properties of the SIR model. We illustrate the application of the method by estimating the recent levels of immunity in 10 US states with highest case numbers of COVID-19.

Philosophical Perspectives, Jochen Albrecht

Publications and Research

This entry follows in the footsteps of Anselin’s famous 1989 NCGIA working paper entitled “What is special about spatial?” (a report that is very timely again in an age when non-spatial data scientists are ignorant of the special characteristics of spatial data), where he outlines three unrelated but fundamental characteristics of spatial data. In a similar vein, I am going to discuss some philosophical perspectives that are internally unrelated to each other and could warrant individual entries in this Body of Knowledge. The first one is the notions of space and time and how they have evolved in …

Investigation Of An Elevational Gradient Reveals Strong Differences Between Bacterial And Eukaryotic Communities Coinhabiting Nepenthes Phytotelmata, Kadeem J. Gilbert, Leonora S. Bittleston, Mark Arcebal K. Naive, Anthony E. Kiszewski, Perry Archival C. Buenavente, David J. Lohman, Naomi E. Pierce

Publications and Research

Elevation is an important determinant of ecological community composition. It integrates several abiotic features and leads to strong, repeatable patterns of community structure, including changes in the abundance and richness of numerous taxa. However, the influence of elevational gradients on microbes is understudied relative to plants and animals. To compare the influence of elevation on multiple taxa simultaneously, we sampled phytotelm communities within a tropical pitcher plant (Nepenthes mindanaoensis) along a gradient from 400 to 1200 m a.s.l. We use a combination of metabarcoding and physical counts to assess diversity and richness of bacteria, micro-eukaryotes, and arthropods, and compare the …

Using Satellite Imaging Radar To Generate Flood Maps For Humanitarian Response: A Case Study For The 2019 Malawi Floods, Wen Yong Huang, Janet Llinas, Evelin Perez Flores, Aaron Davitt

Publications and Research

Floods are the most common, severe, and damaging natural disasters that can last hours, days, or weeks. Given its location along the great African Rift Valley, Malawi is especially vulnerable to floods due to its geography and low economic development (Figure 1). About 80 percent of Malawi‘s population lives in an agrarian economy. From January to March 2019, severe floods affected nearly 1 million people and claimed 56 lives in Malawi. The floods were caused by tropical cyclone Idai from March 4 to March 21, one of the worst tropical cyclones on record, and heavy rains that followed. The floods …

Impact Of Meteorological Factors On The Covid-19 Transmission: A Multicity Study In China, Jiangtao Liu, Ji Zhou, Jinxi Yao, Xiuxia Zhang, Lanyu Li, Xiaocheng Xu, Xiaotao He, Bo Wang, Shihua Fu, Tingting Niu, Jun Yan, Yanjun Shi, Xiaowei Ren, Jingping Niu, Weihao Zhu, Sheng Li, Bin Luo, Kai Zhang

Publications and Research

The purpose of the present study is to explore the associations between novel coronavirus disease 2019 (COVID- 19) case counts and meteorological factors in 30 provincial capital cities of China. We compiled a daily dataset including confirmed case counts, ambient temperature (AT), diurnal temperature range (DTR), absolute humidity (AH) and migration scale index (MSI) for each city during the period of January 20th to March 2nd, 2020. First, we explored the associations between COVID-19 confirmed case counts, meteorological factors, and MSI using non-linear regression. Then, we conducted a two-stage analysis for 17 cities with more than 50 confirmed cases. In …

Streamlining Time Spent In Alternative Developmental Mathematics Pathways: Increasing Access To College-Level Mathematics Courses By Altering Placement Procedures, Marla A. Sole

Publications and Research

Developmental mathematics, which is designed to prepare students for college-level mathematics courses, can be a barrier to students’ success. In the United States, the majority of students placed into developmental mathematics courses fail to complete the developmental sequence. Alternative mathematics pathways offer some benefits when integrated with “just-in- time support” or expedited instruction on specific prerequisite concepts needed solely for the current lesson. This study compares two statistics courses taught at a public community college: a complete course taught in one semester and a two-semester version with just-in-time developmental content integrated into the course. The study found that students placed …

Learning To Use Mathematics Vs Mastering Basics, Bukurie Gjoci

Publications and Research

This paper bestows the literature support for the need of innovative curriculum and instruction approaches of College Mathematics courses offered to students in need of remediation. One such curriculum is presented here. Designed in agreement with AMATYC (2018)-IMPACT’s vision, this innovative curriculum & instruction approach aims to create student-centered learning environments, engage students in written and oral communication and meaningful use of technology. It immerses students into subject’s big picture, explaining its components implicitly and narrows the gap between school and out-of-school mathematics.

This is Part 1 of the research project aiming to explore the use of top-down instructions when …

Supporting Twenty-First-Century Students With An Across-The-Curriculum Approach To Undergraduate Research, Patrick Corbett, Jody R. Rosen

Publications and Research

An across-the-curriculum (ATC) approach to undergraduate research (UR) is a productive addition to UR ecosystems at equity-oriented institutions. The ATC approach is differentiated from mentored UR experiences and laboratory course-based UR experiences by its ability to employ experiential, problem-based skills and practices for a broad variety of informal research activities at all levels of curriculum and without special facilities. In doing so, the ATC model encourages faculty to make the application of twenty-first-century student learning outcomes explicit for students who are new to research so that they see how inquiry, knowledge creation, and other aspects of problem-solving are used in …

Does Applying Deep Learning In Financial Sentiment Analysis Lead To Better Classification Performance?, Tao Wang, Changhe Yuan, Cuiyuan Wang

Publications and Research

Using a unique data set from Seeking Alpha, we compare the deep learning approach with traditional machine learning approaches in classifying financial text. We apply the long short-term memory (LSTM) as the deep learning method and Naive Bayes, SVM, Logistic Regression, XGBoost as the traditional machine learning approaches. The results suggest that the LSTM model outperforms the conventional machine learning methods on all metrics. Based on the tSNE graph, the success of the LSTM model is partially explained as the high-accuracy LSTM model distinguishes between positive and negative important sentiment words while those words are chosen based on SHAP values …

Implementing Information Literacy (Il) Into Stem Writing Courses: Effect Of Il Instruction On Students’ Writing Projects At An Urban Community College, Miseon Kim, Mercedes Franco, Dugwon Seo

Publications and Research

The purpose of this study was to implement information literacy (IL) into Science, Technology, Engineering, and Mathematics (STEM) writing courses at an urban community college, investigate if students’ information literacy (IL) skills were improved through library one-shot instruction, and determine if there was an association between IL skills and students’ writing performance. Students in the experimental group attended the library instructional class and students in the control group had no library class. Students’ research papers were scored using the Association of American Colleges & Universities (AAC&U) Information Literacy VALUE Rubric to grade the effectiveness of the library instruction (Association …

The Ends Of Medicine And The Experience Of Patients, D. Robert Macdougall

Publications and Research

The ends of medicine are sometimes construed simply as promotion of health, treatment and prevention of disease, and alleviation of pain. Practitioners might agree that this simple formulation captures much of what medical practice is about. But while the ends of medicine may seem simple or even obvious, the essays in this issue demonstrate the wide variety of philosophical questions and issues associated with the ends of medicine. They raise questions about how to characterize terms like “health” and “disease”; whether medicine’s goals should be extended to include enhancement beyond normal human function; and whether the ends of medicine are …

Out Of The Archives And Into The Streets: Teaching With Primary Sources To Cultivate Civic Engagement, Jen Hoyer

Publications and Research

This article examines whether teaching with primary sources can cultivate civic engagement by investigating the competencies involved in developing student civic engagement and aligning these with outcomes from teaching with primary sources. Using three examples from Brooklyn Connections, a primary source-based education outreach program that offers a free standards-based and curriculum-aligned school partnership program for grades four through twelve, this case study illustrates the potential for using primary sources to cultivate skills, knowledge, and student agency. Through assessment of these examples in teaching with primary sources using protocols developed for evaluation of programs that focus on developing civic engagement, the …

A Micro-Optic Stalk (Muos) System To Model The Collective Migration Of Retinal Neuroblasts, Stephanie Zhang, Miles Markey, Caroline D. Pena, Tadmiri Venkatesh, Maribel Vasquez

Publications and Research

Contemporary regenerative therapies have introduced stem-like cells to replace damaged neurons in the visual system by recapitulating critical processes of eye development. The collective migration of neural stem cells is fundamental to retinogenesis and has been exceptionally well-studied using the fruit fly model of Drosophila Melanogaster. However, the migratory behavior of its retinal neuroblasts (RNBs) has been surprisingly understudied, despite being critical to retinal development in this invertebrate model. The current project developed a new microfluidic system to examine the collective migration of RNBs extracted from the developing visual system of Drosophila as a model for the collective motile processes …

Fibration Symmetries Uncover The Building Blocks Of Biological Networks, Flaviano Morone, Ian Leifer, Hernán A. Makse

Publications and Research

A major ambition of systems science is to uncover the building blocks of any biological network to decipher how cellular function emerges from their interactions. Here, we introduce a graph representation of the information flow in these networks as a set of input trees, one for each node, which contains all pathways along which information can be transmitted in the network. In this representation, we find remarkable symmetries in the input trees that deconstruct the network into functional building blocks called fibers. Nodes in a fiber have isomorphic input trees and thus process equivalent dynamics and synchronize their activity. Each …

Mathematics Identity And Achievement Among Black Students, Lidia Gonzalez, Shawnda Chapman Brown, Juan Battle

Publications and Research

Employing data from the National Center of Educational Statistics’ (NCES) High School Longitudinal Study (HSLS) and utilizing critical race theory and intersectionality as theoretical frameworks, this article interrogates the relationship between mathematics identity and math success for a nationwide sample of Black secondary school students. More specifically, hierarchical regression modeling is employed to examine the relative impact of math identity, demographic variables, and school/parent social capital variables on the math grade point averages of this sample. The article ends with a discussion of specific steps for teaching mathematics that put the identity of those from traditionally marginalized communities at the …

Microfluidic Study Of The Electrocoalescence Of Aqueous Droplets In Crude Oil, Thomas Leary, Mohsen Yeganeh, Charles Maldarelli

Publications and Research

In electrocoalescence, an electric field is applied to a dispersion of conducting water droplets in a poorly conducting oil to force the droplets to merge in the direction of the field. Electrocoalescence is used in petroleum refining to separate water from crude oil and in droplet-based microfluidics to combine droplets of water in oil and to break emulsions. Using a microfluidic design to generate a two-dimensional (2D) emulsion, we demonstrate that electrocoalescence in an opaque crude oil can be visualized with optical microscopy and studied on an individual droplet basis in a chamber whose height is small enough to make …

Collection Development At Two Armenian University Libraries: A Conversation With Librarians And Faculty, John Carey, D. Aram Donabedian, Arshak Balayan

Publications and Research

In the summer of 2016 two Hunter College librarians, working with a colleague in the Republic of Armenia, conducted an IRB-approved focus group at the American University of Armenia in Yerevan, Armenia. This group drew participants from the libraries and other academic departments of the American University of Armenia as well as Yerevan State University, a large public institution. The discussion attempted to ascertain whether these libraries have devised effective strategies to acquire materials and build collections in the face of the challenges they face (budgetary, linguistic, and sometimes political) and whether faculty at these institutions feel their library’s collection …

Evolutionary Traits That Enable Scleractinian Corals To Survive Mass Extinction Events, Gal Dishon, Michal Grossowicz, Michael Krom, Gilad Guy, David F. Gruber, Dan Tchernov

Publications and Research

Scleractinian “stony” corals are major habitat engineers, whose skeletons form the framework for the highly diverse, yet increasingly threatened, coral reef ecosystem. Fossil coral skeletons also present a rich record that enables paleontological analysis of coral origins, tracing them back to the Triassic (~241 Myr). While numerous invertebrate lineages were eradicated at the last major mass extinction boundary, the Cretaceous-Tertiary/K-T (66 Myr), a number of Scleractinian corals survived. We review this history and assess traits correlated with K-T mass extinction survival. Disaster-related “survival” traits that emerged from our analysis are: (1) deep water residing (>100 m); (2) cosmopolitan distributions, …

Predictor Species: Improving Assessments Of Rare Species Occurrence By Modeling Environmental Co-Responses, Peter R. Thompson, William F. Fagan, Phillip P. A. Staniczenko

Publications and Research

Designing an effective conservation strategy requires understanding where rare species are located. Because rare species can be difficult to find, ecologists often identify other species called conservation surrogates that can help inform the distribution of rare species. Species distribution models typically rely on environmental data when predicting the occurrence of species, neglecting the effect of species' co-occurrences and biotic interactions. Here, we present a new approach that uses Bayesian networks to improve predictions by modeling environmental co-responses among species. For species from a European peat bog community, our approach consistently performs better than single-species models and better than conventional multi-species …

Theoretical Analysis Of The Leakage Through The Cement Line Of A Single Osteon, Gaffar Gailani, Stephen Cowin

Publications and Research

This work focuses on the Lacunar–Canalicular Porosity (PLC) of cortical bone which includes the osteons. Osteons are semicylindrical porous structures saturated with fluid within the bone and are approximately 250" role="presentation">μ" role="presentation">μm in diameter. The outer boundary of the osteon is called the cement line. Some studies suggested that the cement line is less highly mineralized and produced evidence that it has less calcium and phosphorus and more sulfur than the neighboring bone lamellae. Most authors assume that the cement line is impermeable, while others assume that some canaliculi are crossing the cement line which will make it …

Community College Incoming Freshman Mathematics Course-Taking, Anders J. Stachelek, Alexandra Logue

Publications and Research

This data set accompanies an article discussing the mathematics course-taking patterns of incoming freshmen students at community colleges.

Artificial Intelligence: A New Paradigm In Obstetrics And Gynecology Research And Clinical Practice, Pulwasha Iftikhar, Marcela V. Kuijpers, Azadeh Khayyat, Aqsa Iftikhar, Maribel Degouvia De Sa

Publications and Research

Artificial intelligence (AI) is growing exponentially in various fields, including medicine. This paper reviews the pertinent aspects of AI in obstetrics and gynecology (OB/GYN) and how these can be applied to improve patient outcomes and reduce the healthcare costs and workload for clinicians.

Herein, we will address current AI uses in OB/GYN, and the use of AI as a tool to interpret fetal heart rate (FHR) and cardiotocography (CTG) to aid in the detection of preterm labor, pregnancy complications, and review discrepancies in its interpretation between clinicians to reduce maternal and infant morbidity and mortality. AI systems can be used …

Work Alienation And Its Gravediggers: Social Class, Class Consciousness, And Activism, Jeremy Sawyer, Anup Gampa

Publications and Research

Work activity is central to human psychology. However, working conditions under capitalist socioeconomic relations have been posited as psychologically alienating. Given the negative impact of work alienation on well-being and mental health, we conducted two studies of the relations between social class, work conditions, and alienation. We also examined factors that might counteract alienation – class consciousness and activism. The utility of a Marxist measure of social class – based on objective work relations – was compared with that of SES and subjective class measures. Study 1 surveyed 240 U.S. adults from diverse socioeconomic backgrounds using Amazon’s Mechanical Turk; Study …