Digital Commons Network^™

Dipolar Ordering In Crystals Of Mn12 Ac, Dmitry A. Garanin

Publications and Research

Ordering in realistic elongated box-shape crystals of the molecular magnet Mn_12 Ac is investigated with the site-resolved mean-field approximation that does not assume a uniform ordering. It is shown that ferromagnetic ordering should not occur in crystals with the aspect ratio up to 12. Instead, for the aspect ratio about 6, the inner and outer regions of the crystal order in different directions, uniformly along its length. Finding ordering temperature by extrapolating the inverse susceptibility curve does not provide a correct T_C.

Edges And Diffractive Effects In Casimir Energies, Daniel N. Kabat, Dimitra Karabali, V P. Nair

Publications and Research

The prototypical Casimir effect arises when a scalar field is confined between parallel Dirichlet boundaries. We study corrections to this when the boundaries themselves have apertures and edges. We consider several geometries: a single plate with a slit in it, perpendicular plates separated by a gap, and two parallel plates, one of which has a long slit of large width, related to the case of one plate being semi-infinite. We develop a general formalism for studying such problems, based on the wavefunctional for the field in the gap between the plates. This formalism leads to a lower dimensional theory defined …

On The Casimir Interaction Between Holes In A Plate, Daniel N. Kabat, Dimitra Karabali, V P. Nair

Publications and Research

We study the leading long-distance attractive force between two holes in a plate arising from a scalar eld with Dirichlet boundary conditions on the plate. We use a formalism in which the interaction is governed by a non-local eld theory which lives on the two holes. The interaction energy is proportional to Q1Q2=r7 at large separation r, where Q1 and Q2 are certain charges associated with the holes. We compute these charges for round and rectangular holes. We show that the 1=r7 behavior is universal for separations large compared to the linear dimensions of the holes, irrespective of the spin …

Dynamical Decompactification And Three Large Dimensions, Brian Greene, Daniel N. Kabat, Stefanos Marnerides

Publications and Research

We study string gas dynamics in the early universe and seek to realize the Brandenberger - Vafa mechanism - a goal that has eluded earlier works - that singles out three or fewer spatial dimensions as the number which grow large cosmologically. Considering wound string interactions in an impact parameter picture, we show that a strong exponential suppression in the interaction rates for d > 3 spatial dimensions reflects the classical argument that string worldsheets generically intersect in at most four spacetime dimensions. This description is appropriate in the early universe if wound strings are heavy - wrapping long cycles - …

The Hamiltonian Approach To Yang-Mills (2 + 1): Expansion Scheme And Corrections To String Tension, Dimitra Karabali, V P. Nair, Alexandr Yelinkov

Publications and Research

We carry out further analysis of the Hamiltonian approach to Yang-Mills theory in 2+1 dimensions which helps to place the calculation of the vacuum wave function and the string tension in the context of a systematic expansion scheme. The solution of the Schrodinger equation is carried out recursively. The computation of correlators is re-expressed in terms of a two-dimensional chiral boson theory. The effective action for this theory is calculated to first order in our expansion scheme and to the fourth order in a kinematic expansion parameter. The resulting corrections to the string tension are shown to be very small, …

A Multivalent Dna Aptamer Specific For The B-Cell Receptor On Human Lymphoma And Leukemia, Prabodhika R. Mallikaratchy, Alessandro Ruggiero, Jeffrey R. Gardner, Vitaly Kuryavyi, William F. Maguire, Mark L. Heaney, Michael R. Mcdevitt, Dinshaw J. Patel, David A. Scheinberg

Publications and Research

Long-term survival still eludes most patients with leukemia and non-Hodgkin’s lymphoma. No approved therapies target the hallmark of the B cell, its mIgM, also known as the B-cell receptor (BCR). Aptamers are small oligonucleotides that can specifically bind to a wide range of target molecules and offer some advantages over antibodies as therapeutic agents. Here, we report the rational engineering of aptamer TD05 into multimeric forms reactive with the BCR that may be useful in biomedical applications. Systematic truncation of TD05 coupled with modification with locked nucleic acids (LNA) increased conformational stability and nuclease resistance. Trimeric and tetrameric versions with …

Core/Shell Nanoparticles As Hybrid Platforms For The Fabrication Of A Hydrogen Peroxide Biosensor, Yu-Ho Won, Doreen Aboagye, Ho Seong Jang, Andrei Jitianu, Lia A. Stanciu

Publications and Research

No abstract provided.

Modern Time: Photography And Temporality, Kris Belden-Adams

Dissertations, Theses, and Capstone Projects

This dissertation explores the fluid relationship of photography to time. Many theorists have noted that photography has a distinctive manner of representing temporality. Roland Barthes, for example, wrote that the photograph has a peculiar capacity to represent the past in the present, and thus to imply the passing of time in general. As a consequence, Barthes argued, all photographs speak of the inevitability of our own death in the future. Moreover, he linked photography's peculiar temporality to its capacity for a certain kind of realism: "false on the level of perception, true on the level of time." Barthes's analysis poses …

Guest Editorial: On Method, Technorealism And Aesthetic Capitalism, Patricia Ticineto Clough

Publications and Research

The guest editorial excerpts the keynote address Professor Clough held at the First Annual Graduate Student Conference hosted by the Graduate Center's Sociology Students Association.

Automatic Readability Assessment, Lijun Feng

Dissertations, Theses, and Capstone Projects

We describe the development of an automatic tool to assess the readability of text documents. Our readability assessment tool predicts elementary school grade levels of texts with high accuracy. The tool is developed using supervised machine learning techniques on text corpora annotated with grade levels and other indicators of reading difficulty. Various independent variables or features are extracted from texts and used for automatic classification. We systematically explore different feature inventories and evaluate the grade-level prediction of the resulting classifiers. Our evaluation comprises well-known features at various linguistic levels from the existing literature, such as those based on language modeling, …

The Piano Works Of Páll Ísólfsson (1893–1974): A Diverse Collection, Nina Margret Grimsdottir

Dissertations, Theses, and Capstone Projects

The piano works of Páll Ísólfsson (1893-1974) form a diverse collection of twenty-six pieces that consists of nineteen character pieces, one set of variations, and six liturgical pieces. They were composed during 1920-1970, and now for the first time, the collection can, in this dissertation, be appreciated in its entirety. The important steps taken along the way have included publication, recordings, research and concert performances.

The character pieces divide into four groups according to stylistic influence and maturity. Most of the earlier pieces fall into the "humorous burlesque" or "sentimental lyric" group; the other two groups belong to traditional dance …

Doing Good By Doing Well? The Political Economy Of The Medical Biotechnology Industry In The United States, Volker Lehmann

Dissertations, Theses, and Capstone Projects

This study is dedicated to the political economy of the medical biotechnology industry in the United States. The study combines interviews with more than 150 biotechnology actors with a historical analysis and evidence from publicly available data bases. The ascent of this new industry took place in the United States first and foremost, because there, scientific advancements coincided with the rise of supply-side economics, a policy shift that was part of a larger, neoliberal, ideological shift. Despite free-market rhetoric, specific clusters within the United States became the world's leading biotechnology clusters because of a history of targeted interventions to stimulate …

Design And Performance Analysis Of Genetic Algorithms For Topology Control Problems, Cem Safak Sahin

Dissertations, Theses, and Capstone Projects

In this dissertation, we present a bio-inspired decentralized topology control mechanism, called force-based genetic algorithm (FGA), where a genetic algorithm (GA) is run by each autonomous mobile node to achieve a uniform spread of mobile nodes and to provide a fully connected network over an unknown area. We present a formal analysis of FGA in terms of convergence speed, uniformity at area coverage, and Lyapunov stability theorem.

This dissertation emphasizes the use of mobile nodes to achieve a uniform distribution over an unknown terrain without a priori information and a central control unit. In contrast, each mobile node running our …

The Influence Of Cross-Linguistic Input And L2 Proficiency On L2 Reading Comprehension Among Spanish-Speaking Adults Learning English As A Second Language, Astrid Sussette Rodríguez

Dissertations, Theses, and Capstone Projects

Developing literacy and language proficiency in English is essential to thrive in school and in the workforce in American society. Research on cross-linguistic influences on text-level skills is scant, especially studies investigating reading comprehension among language-minority adults. The present study investigated the effects of cross-linguistic input and second language proficiency on second language reading comprehension among Spanish-speaking adults enrolled in English as a Second Language (ESL) classes at a community college in New York City. The main research question was whether language-minority adults would comprehend printed text better if they read it in Spanish (L1) followed by English (L2) than …

Three Essays On The Determinants Of Foreign Direct Investment (Fdi), Haitao Liang

Dissertations, Theses, and Capstone Projects

At first, a literature review of over 150 articles on the determination of Foreign Direct Investment (FDI) proposes the main determinants of FDI. A meta-analysis tests the reliability of the previous studies on FDI.

Then, a cluster analysis on FDI data reveals the necessary to segment economies, especially by income level, in FDI analysis.

A large number of studies emphasize FDI determinants but ignore the income distribution on the results, which biases the estimates. In Chapter 3, I correct for heterogeneity due to income distribution by using the Blundell-Bond System GMM (Generalized Method of Moments), which controls for endogeneity problem …

The Interaction Of Intensity And Deviance On Auditory Event-Related Potentials: Findings Using Principal Component Analysis (Pca) Of Current Source Densities (Csds), Nathan A. Gates

Dissertations, Theses, and Capstone Projects

Mismatch negativity (MMN) studies provide insights into the brain's ability to perceive and/or detect deviations from established sensory patterns. Clinical studies investigating the loudness-dependency of auditory evoked potential (LDAEP) have shown a relationship between the intensity of an auditory stimulus and neuro-physiological or -chemical activity of the primary auditory cortex. Unfortunately, these two bodies of literature remain disjointed. The present study integrates elements of each body of literature to a) investigate the impact of varying levels of intensity deviance on N1/P2 with a standard set of intensities used in LDAEP paradigms, and b) assess the extent to which deviance-related processes …

Stability And Change In New York State Regents Mathematics Examinations, 1866-2009: A Socio-Historical Analysis, Robert Stephen Watson

Dissertations, Theses, and Capstone Projects

This dissertation illuminates relationships between micro-level practices of schools and macro-level structures of society through the socio-historical lens of New York State Regents mathematics examinations, which were administered to public school students throughout the State of New York between 1866 and 2009, inclusive. Fundamental research questions involved in this study are: 1) How has the classification, framing, and assessment of Regents level mathematics curricula in the public schools of New York changed since 1866?: and 2) How has popularization influenced the contents, structure and academic rigor of Regents mathematics examinations? Basil Bernstein's theory of educational transmissions provides a theoretical framework …

Nearest Neighbor Search With Strong Location Privacy, Stavros Papadopoulos, Spiridon Bakiras, Dimitris Papadias

Publications and Research

The tremendous growth of the Internet has significantly reduced the cost of obtaining and sharing information about individuals, raising many concerns about user privacy. Spatial queries pose an additional threat to privacy because the location of a query may be sufficient to reveal sensitive information about the querier. In this paper we focus on k nearest neighbor (kNN) queries and define the notion of strong location privacy, which renders a query indistinguishable from any location in the data space. We argue that previous work fails to support this property for arbitrary kNN search. Towards this end, we introduce methods that …

Essays On Economic Policy: Income Inequality And Health Insurance, Eric Doviak

Dissertations, Theses, and Capstone Projects

This dissertation contains economic analyses of two critical social issues facing the United States at the dawn of the 21st century: income inequality and the affordability of health insurance.

The chapter on income inequality uses the Solow Model of economic growth to model the evolution of inequality over time. In steady state, differences in household saving rates generate differences in household capital income. Households that save more accumulate more capital and have higher steady-state income. Tax policy affects the distribution of income through its influence on household saving rates. Increasing the tax rate on labor income causes a greater percentage …

Historically Black Colleges Advance Reverse Academic Diversity, L. Darnell Weeden

City University of New York Law Review

No abstract provided.

Optimal Cryptographic Hardness Of Learning Monotone Functions, Dana Dachman-Soled, Homin K. Lee, Tal Malkin, Rocco A. Servedio, Andrew Wan, Hoeteck Wee

Publications and Research

Over the years a range of positive algorithmic results have been obtained for learning various classes of monotone Boolean functions from uniformly distributed random examples. Prior to our work, however, the only negative result for learning monotone functions in this model has been an information-theoretic lower bound showing that certain super-polynomial-size monotone circuits cannot be learned to accuracy 1/2+w(log n/ p n) (Blum, Burch, and Langford, FOCS’98). This is in contrast with the situation for nonmonotone functions, where a wide range of cryptographic hardness results establish that various “simple” classes of polynomial-size circuits are not learnable by polynomial-time algorithms.

In …

The Ticker, December 7, 2009

The Ticker

The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.

The Ticker, November 9, 2009

The Ticker

The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.

Correlating Molecular Phylogeny With Venom Apparatus Occurrence In Panamic Auger Snails (Terebridae), Mandë Holford, Nicolas Puillandre, Maria Vittoria Modica, Maren Watkins, Rachel Collin, Eldredge Bermingham, Baldomero M. Olivera

Publications and Research

Central to the discovery of neuroactive compounds produced by predatory marine snails of the superfamily Conoidea (cone snails, terebrids, and turrids) is identifying those species with a venom apparatus. Previous analyses of western Pacific terebrid specimens has shown that some Terebridae groups have secondarily lost their venom apparatus. In order to efficiently characterize terebrid toxins, it is essential to devise a key for identifying which species have a venom apparatus. The findings presented here integrate molecular phylogeny and the evolution of character traits to infer the presence or absence of the venom apparatus in the Terebridae. Using a combined dataset …

Pointcut Rejuvenation: Recovering Pointcut Expressions In Evolving Aspect-Oriented Software, Raffi Khatchadourian, Phil Greenwood, Awais Rashid, Guoqing Harry Xu

Publications and Research

Pointcut fragility is a well-documented problem in Aspect-Oriented Programming; changes to the base-code can lead to join points incorrectly falling in or out of the scope of pointcuts. We present an automated approach that limits fragility problems by providing mechanical assistance in pointcut maintenance. The approach is based on harnessing arbitrarily deep structural commonalities between program elements corresponding to join points selected by a pointcut. The extracted patterns are then applied to later versions to offer suggestions of new join points that may require inclusion. We demonstrate the usefulness of our technique by rejuvenating pointcuts in multiple versions of several …

The Accounting At A Tipping Point – Decline Or Renewal, Susan Haka

Publications and Research

No abstract provided.

The Ticker, October 19, 2009

The Ticker

The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.

In Transit Vol 4 Fall 2009, Laguardia Community College

LaGuardia Community College Publications

In Transit is the LaGuardia Journal on Teaching and Learning. It is published by the Center for Teaching and Learning at LaGuardia Community College, CUNY.

Contributing Factors To Pointcut Fragility, Phil Greenwood, Awais Rashid, Raffi Khatchadourian

Publications and Research

Pointcut fragility is a well-documented problem of Aspect-Oriented Programming with changes to the base-code causing join points to incorrectly fall in or out of scope. In order to combat this problem a tool was developed that provides mechanical assistance to pointcut maintenance. This tool relied on the deep structural commonalities between program elements to detect when pointcut fragility occurs. During the assessment of this tool a number of common practices were uncovered that were employed both in the aspect and base-code that contributed to or prevented pointcut fragility. This paper documents the practices uncovered and describes how they can affect …

The Ticker, September 8, 2009

The Ticker

The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.