cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Three Essays on Early Internationalization: Antecedents, Process and Performance Outcomes
Creators: name: Fariborzi, Hadi
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: Early internationalization
subject: International Business
subject: Entrepreneurship
subject: Firm-specific Advantages
subject: International Entrepreneurship
subject: Business Administration--Management

description: Internationalization of firms in the early years after their start-up is a phenomenon on the rise. Scholarly work on these early internationalizing firms have made significant contributions to our understanding about the antecedents to their emergence, the process of their formation and operation, and their performance outcomes. There are, however, important gaps in our understanding about these firms due to inconsistency in findings of past research and lack of cohesive, integrative and theory-driven studies. This dissertation is an attempt to fill these gaps by integrating findings of past research and exploring processes and outcomes seldom analyzed before. The meta-analysis structural equation modelling in Chapter 2 integrates findings of past empirical research and finds support for an explanatory framework consistent with mainstream international business theories. The analysis in Chapter 3 showed that firms rely on balancing the slack in their human resources across alternative growth paths, whereby lower levels of slack motivate international product development while higher levels of slack stimulate international expansion. Lastly, the survival analysis in Chapter 4 shows that when the preparedness of firms based on their firm-specific advantages to enter international markets is accounted for, young ventures with an international presence have a higher survival rate compared with their domestic counterparts. Despite limitations, the totality of these findings have important contributions to our understanding of early internationalization. They show that mainstream international business theories can be used to explain the case of early internationalizing firms. This theoretical framework can be supplemented, rather than supplanted, by findings of empirical research on early internationalization. This dissertations also provides details about growth decisions of young firms explaining a choice of international expansion as opposed to alternative growth paths, and offers insights about the performance outcomes and survival effects of early internationalization. The findings of these manuscript cast new light on the significant role of firm-specific advantages at the individual- and firm-level in the internationalization process of entrepreneurial firms. Besides they suggest there might be boundary conditions to a widely accepted concept in international entrepreneurship, the learning advantages of newness that can be further explored in future research.
Outward FDI from Germany and its policy context, 2012
Creators: name: Jost, Thomas
Publisher: name: Columbia University
Year: 2012
Subjects: Finance
Economics

description: In 2011, German outward foreign direct investment (OFDI) flows temporarily declined, regaining their growth momentum again in the first half of 2012. The German corporate sector further expanded its foreign operations to gain and expand market access and improve the efficiency of its international production networks. The European sovereign debt crisis had no major negative effects on German OFDI until mid-2012. Recently, however, several indicators have suggested that the foreign investment plans of German multinational enterprises (MNEs) are under revision due to the continuing European sovereign debt crisis and the economic downturn in many European economies. The German Government has continued to support the internationalization process of the German corporate sector.
Zur Geschichte der Dampfmaschine des TECHNOSEUM
Creators: name: Römer, Daniel
Publisher: name: KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Year: 2023

description: KULTEC – Magazin für Technik, Kultur und Museumsarbeit, Bd. 3 (2023): KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Metabolite variation in ecologically diverse black cottonwood, Populus trichocarpa Torr. & A. Gray
Creators: name: Fayed, Manal A.
Publisher: name: University of British Columbia
Year: 2011

description: Black cottonwood (Populus trichocarpa Torr. & A. Gray) is mass productive tree species native to the Pacific Northwest of North America. Gas chromatography - mass spectrometry was used to study the metabolic profiling of leaves from multiple genotypes to investigate the presence of clinal trends in metabolite levels and to determine if relationships with geo-climatic variables and date of bud set exist. In the late summer (September 3rd) of 2008, young leaves were collected from the species’ range and represented by 106 clones grown in a common garden established in Vancouver, British Columbia, Canada. The results validity was verified through the use of two independent canonical correlation analyses (CCA) that were performed on the intensity of the detected 104 compounds, including 40 known metabolites. Principle Component Analysis (PCA) was performed for original variables reduction and to determine the principle components accounting for most of the variation (the first ten PCAs accounted for 63% of the variation). The first analysis utilized the metabolites associated with the first ten principal components to determine the relationship between the original metabolites and geography, climate and date of bud set, while the second was based on the first ten principal components themselves. Both analyses yielded strong to moderate trends but the correlations (ranging from 0.45 to 0.97) were not statistically significant most likely due to the small sample size used. Based on the analyses conducted, it appears that P. trichocarpa ecotypes are preconditioned to suite their location-origin and the observed differences in metabolites reflected the genotypic variability among the studied trees.
Monetary unions and the problem of sovereignty
Creators: name: Mundell, Robert A.
Publisher: name: Columbia University
Year: 2002
Subjects: Economics
Finance

description: Monetary integration involves a consideration of two quite different types or dimensions of sovereignty.One is policy sovereignty, and the other is legal sovereignty. Policy sovereignty refers to the ability to conduct policy independent of commitments to other countries. Legal sovereignty refers to the ability of a state to make its own laws without limitations imposed by any outside authority. Both concepts need to be considered in plans for monetary unions. What are the implications of a change in legal sovereignty when the national currencies of some of the oldest states in the world abandon national sovereignty, and what will they receive in exchange?
The Use of Climate Information in Impact Assessment for Malaria Interventions: Workshop Report
Creators: name: Getinet, Yohannes
name: Miheretie, Abere
name: Thomson, Madeleine C.
Publisher: name: Columbia University
Year: 2012
Subjects: Climatic changes--Health aspects
Malaria--Prevention
Public health

description: Since the inception of the Roll Back Malaria (RBM) initiative, hundreds of millions of dollars have been spent by national governments, NGOs and the international donor community to reduce the burden of malaria in Africa. Subsequent to intervention efforts, a substantial decline in malaria cases have been observed in around the world; however, the attribution of such decline to interventions alone in some areas has been questioned, and there is increasing concern that climate variability and change may be confounding the assessment of the impact of interventions designed to achieve the malaria Millennium Development Goal targets. In particular, the recent extended drought period in Eastern Africa may have contributed to malaria's decline. The recent workshop, "Climate and Health in Africa -- 10 Years On" (Addis Ababa, April 4-6. 2011), provided a detailed list of recommendations for improving the management of climate sensitive health outcomes through the better provision of climate services, as well as through building capacity in the health community to use climate information in routine decision-making. Building on the outcomes of a recent project funded by Google.org, "Building Capacity to Produce and Use Climate and Environmental Information for Improving Health in East Africa," this workshop (Addis Ababa, December 12-14, 2011) sought to establish data and methods whereby the confounding effect of climate variability on malaria impact assessment could be removed.
Vertical Foreclosure with the Choice of Input Specifications
Creators: name: Choi, Jay Pil
name: Yi, Sang-Seung
Publisher: name: Columbia University
Year: 1997
Subjects: Economics
Commerce

description: This paper develops an equilibrium model of vertical foreclosure with the choice of input specifications. In this model, vertical foreclosure occurs as the upstream division of the integrated firm makes a specialized input for its sister downstream division while it would, as an independent firm, provide a generalized input. The changes in incentives whit vertical integration allows the upstream firm to internalize the benefit of raising the rival firm's cost at the downstream level. The choice of a specialized input by the integrated firm serves as a natural commitment mechanism not to supply the rival downstream firms, and thus enables us to dispense with the controversial price commitment assumption in the literature. We derive conditions for equilibrium vertical foreclosure to occur and discuss its welfare consequences.
Emotion and Sentiment Analysis from Twitter Text
Creators: name: Sailunaz, Kashfia
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: Text Emotion Analysis
subject: Computer Science

description: Online social networks have emerged as new platform that provide people an arena to share their views and perspectives on different issues and subjects with their friends, family, and other users. We can share our thoughts, mental states, moments and stances on specific social, and political issues through texts, photos, audio/video messages and posts. Indeed, despite the availability of other forms of communication, text is still one of the most common ways of communication in a social network. Twitter was chosen in this research for data collection, experimentation and analysis. The research described in this thesis is to detect and analyze both sentiment and emotion expressed by people through texts in their Twitter posts. Tweets and replies on few recent topics were collected and a dataset was created with text, user, emotion and sentiment information. The customized dataset had user detail like user ID, user name, user's screen name, location, number of tweets/followers/likes/followees. Similarly, for textual information, tweet ID, tweet time, number of likes/replies/retweets, tweet text, reply text and few other text based data were collected. The texts of the dataset were then annotated with proper emotions and sentiments according to some benchmark models. The customized dataset was then used to detect sentiment and emotion from tweets and their replies using machine learning. The influence scores of users were also calculated based on various user-based and tweet-based parameters. Based on those information, both generalized and personalized recommendations were offered for users based on their Twitter activities.
Low Frequency Imaging of Fields at High Galactic Latitude with the Murchison Widefield Array 32-Element Prototype
Creators: name: Williams, Christopher L.
name: Hewitt, Jacqueline N.
name: Levine, Alan M.
name: de Oliveira-Costa, Angelica
name: Bowman, Judd D.
name: Briggs, Frank H.
name: Gaensler, B. M.
name: Hernquist, Lars L.
name: Mitchell, Daniel A.
name: Morales, Miguel F.
name: Sethi, Shiv K.
name: Subrahmanyan, Ravi
name: Sadler, Elaine M.
name: Arcus, Wayne
name: Barnes, David G.
name: Bernardi, Gianni
name: Bunton, John D.
name: Cappallo, Roger C.
name: Crosse, Brian W.
name: Corey, Brian E.
name: Deshpande, Avinash
name: deSouza, Ludi
name: Emrich, David
name: Goeke, Robert F.
name: Greenhill, Lincoln J.
name: Hazelton, Bryna J.
name: Herne, David
name: Kaplan, David L.
name: Kasper, Justin C.
name: Kincaid, Barton B.
name: Koenig, Ronald
name: Kratzenberg, Eric
name: Lonsdale, Colin J.
name: Lynch, Mervyn J.
name: McWhirter, S. Russell
name: Mitchell, %Daniel A.
name: Morales, %Miguel F.
name: Morgan, Edward H.
name: Oberoi, Divya
name: Ord, Stephen M.
name: Pathikulangara, Joseph
name: Prabu, Thiagaraj
name: Remillard, Ronald A.
name: Rogers, Alan E. E.
name: Roshi, Anish A.
name: Salah, Joseph E.
name: Sault, Robert J.
name: Shankar, N. Udaya
name: Srivani, K. S.
name: Stevens, Jamie B.
name: Tingay, Steven J.
name: Wayth, Randall B.
name: Waterson, Mark
name: Webster, Rachel L.
name: Whitney, Alan R.
name: Williams, Andrew J.
name: Wyithe, J. Stuart B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Murchison Widefield Array (MWA) is a new low-frequency, wide field-of-view radio interferometer under development at the Murchison Radio-astronomy Observatory (MRO) in Western Australia. We have used a 32-element MWA prototype interferometer (MWA-32T) to observe two 50-degree diameter fields in the southern sky in the 110 MHz to 200 MHz band in order to evaluate the performance of the MWA-32T, to develop techniques for epoch of reionization experiments, and to make measurements of astronomical foregrounds. We developed a calibration and imaging pipeline for the MWA-32T, and used it to produce ~15' angular resolution maps of the two fields. We perform a blind source extraction using these confusion-limited images, and detect 655 sources at high significance with an additional 871 lower significance source candidates. We compare these sources with existing low-frequency radio surveys in order to assess the MWA-32T system performance, wide field analysis algorithms, and catalog quality. Our source catalog is found to agree well with existing low-frequency surveys in these regions of the sky and with statistical distributions of point sources derived from Northern Hemisphere surveys; it represents one of the deepest surveys to date of this sky field in the 110 MHz to 200 MHz band.
description: 20 pages, 6 tables, 12 figures. 1 online-only machine readable table. Submitted to ApJ
Sequencing Abandoned Wellsite Reclamations
Creators: name: Thiessen, Ronald James
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: wellsite
subject: reclamation
subject: environment
subject: Social
subject: Economic
subject: sustainable
subject: Engineering
subject: Engineering--Environmental

description: Alberta has 69,100 abandoned oil and gas wells. Once a well is abandoned according to provincial regulations, the wellsite must be reclaimed. This means soil and groundwater contamination caused by well drilling and operations must be removed, and the wellsite returned to a condition equivalent to the vegetation, soil quality, and topography of the surrounding land. Provincial regulations currently do not specify a maximum time to reclaim a wellsite after abandonment. Other jurisdictions have similar issues as well. An appeal heard by the Supreme Court of Canada involving federal bankruptcy and insolvency legislation and provincial energy legislation will likely motivate changes in how and when wellsites are moved from abandoned to reclaimed status. Assuming these changes will occur and since concurrently reclaiming all abandoned wellsites is not practical, this thesis presents a method of prioritising abandoned wellsite reclamations based on indicators of negative economic, environmental, and social impacts. This practical method can be adapted to similar problems elsewhere around the globe. Using publicly available data on wellsite reclamation costs, environmental liability as defined in Canadian accounting guidance is considered an indicator of negative economic impact. Property value reduction is also treated as a negative economic impact indicator and land transfer data from the provincial land titles office is referenced. The adverse environmental effect of an abandoned wellsite is a negative environmental impact indicator and is estimated using preliminary quantitative risk assessment methods. Data supporting this assessment is from publicly available environmental reports on completed wellsite reclamations. Adverse public responses to abandoned wellsites are treated as indicators of negative social impacts and land damage and compensation claims by landowners, public complaints to the provincial energy regulator, and regulatory orders are referenced. These indicators are analysed by censored data and ordinal logistic regression statistical methods as well as a priori classification techniques. They are combined using partial order methods to yield a wellsite reclamation sequencing model that requires three pieces of readily-available wellsite information. The model is illustrated with information on 100 abandoned wellsites in Alberta. Model validation and regulatory policy recommendations are provided.
MOESM1 of Impact of free fatty acids on prognosis in coronary artery disease patients under different glucose metabolism status
Creators: name: Jin, Jing-Lu
name: Cao, Ye-Xuan
name: Liu, Hui-Hui
name: Zhang, Hui-Wen
name: Guo, Yuan-Lin
name: Wu, Na-Qiong
name: Zhu, Cheng-Gang
name: Xu, Rui-Xia
name: Gao, Ying
name: Sun, Jing
name: Dong, Qian
name: Li, Jian-Jun
Publisher: name: figshare
Year: 2019
Subjects: Biochemistry
Medicine
Molecular Biology
Biological Sciences not elsewhere classified
Computational Biology

description: Additional file 1: Additional Figure S1. Flowchart of the study. Figure S2. Distribution of FFAs levels.
Long paths and cycles passing through specified vertices under the average degree condition
Creators: name: Li, Binlong
name: Ning, Bo
name: Zhang, Shenggui
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C38

description: Let $G$ be a $k$-connected graph with $k\geq 2$. In this paper we first prove that: For two distinct vertices $x$ and $z$ in $G$, it contains a path passing through its any $k-2$ {specified} vertices with length at least the average degree of the vertices other than $x$ and $z$. Further, with this result, we prove that: If $G$ has $n$ vertices and $m$ edges, then it contains a cycle of length at least $2m/(n-1)$ passing through its any $k-1$ specified vertices. Our results generalize a theorem of Fan on the existence of long paths and a classical theorem of Erdös and Gallai on the existence of long cycles under the average degree condition.
Coercivity and stability results for an extended Navier-Stokes system
Creators: name: Iyer, Gautam
name: Pego, Robert L.
name: Zarnescu, Arghir
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 76D03

description: In this article we study a system of equations that is known to {\em extend} Navier-Stokes dynamics in a well-posed manner to velocity fields that are not necessarily divergence-free. Our aim is to contribute to an understanding of the role of divergence and pressure in developing energy estimates capable of controlling the nonlinear terms. We address questions of global existence and stability in bounded domains with no-slip boundary conditions. Even in two space dimensions, global existence is open in general, and remains so, primarily due to the lack of a self-contained $L^2$ energy estimate. However, through use of new $H^1$ coercivity estimates for the linear equations, we establish a number of global existence and stability results, including results for small divergence and a time-discrete scheme. We also prove global existence in 2D for any initial data, provided sufficient divergence damping is included.
description: 29 pages, no figures
Barleria cinerea Dominique Champluvier 2011, sp. nov.
Creators: name: Champluvier, Dominique
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Acanthaceae
Barleria
Barleria cinerea

description: Barleria cinerea Champl. sp. nov. Barleriae grandis Nees proxima sed propter inflorescentias valde foliosas, calycis lobos lanceolatos cuspidatosque nec elliptico-oblongos et corollam duplo parviorem bene differt. – Type: D.R.Congo, District du Haut-Katanga, Kiubo, 1956, Duvigneaud 2754 (holo-: BRLU; iso-: BR). Suffrutescent plant probably up to 1 m high. Stems glabrous. Lamina of the leaves ovate, glaucous, 5–12 × 2–5 cm, attenuate at the base, acute at the tip, glabrous when mature, grey tomentose when young; petiole up to 2.5 cm long. Inflorescence foliose; leaves of inflorescence much smaller than those of the stem; axis pubescent-tomentose; flowers solitary, axillary in the upper nodes, bracteoles linear, 15 × 2 mm; calyx lobes lanceolate, cuspidate, the posterior 18 × 4 mm, the anterior one similar but a little smaller and usually bifid at the tip, the lateral ones 10 × 1 mm; corolla slightly puberulent outside, probably pink or white, 4.2 cm long; tube cylindrical, 13 mm long, 12 mm wide at the throat; the two upper median lobes 18 × 7 mm, the two upper lateral 20 × 10 mm, the lower median one 20 × 12 mm; fertile stamens two, filament 24 mm long, anther 4 mm long, staminodes three, 2 mm long; style 32 mm long. Capsule pyriform, flattened, long-beaked, light brown, 14 mm long, two-seeded. Seeds cream, elliptic, 8 mm long, covered with curled tufted hairs. Distribution – Species from the Zambezian centre of endemism, only known from the type. Fig. 4. Habitat – Not given.
description: Published as part of Dominique Champluvier, 2011, New and overlooked Acanthaceae taxa from D. R. Congo, Rwanda and Burundi: (1) the genus Barleria, pp. 82-95 in Plant Ecology and Evolution 144 (1) on page 94, DOI: 10.5091/plecevo.2011.388, http://zenodo.org/record/1486150
Zum Wohle der Krebskranken?
Creators: name: Weiss, Martin P. M.
Publisher: name: KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Year: 2023

description: KULTEC – Magazin für Technik, Kultur und Museumsarbeit, Bd. 3 (2023): KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Health Impact Assessment of Sulfolane on Embryonic Development of Zebrafish (Danio rerio)
Creators: name: Shah, Soham Manoj
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: Sulfolane
subject: Zebrafish
subject: Danio rerio
subject: Morphometrics
subject: Transcript Abundance
subject: Behavioural Assessment
subject: Larval Activity
subject: Remediation
subject: Development
subject: Health Impact Assessment
subject: Animal Physiology
subject: Zoology
subject: FOS: Biological sciences
subject: Toxicology

description: Sulfolane is a widely used polar, aprotic solvent for multiple applications in numerous industries. Through problems with storage, leaks, spills and leeching; sulfolane has been introduced into the environment and has been detected through chemical analysis in groundwater and creeks around the world including Alberta, Canada (800 µg·mL-1), Louisiana, USA (2900 µg·mL-1) and Brisbane, Australia (4344 µg·mL-1). Previous research on terrestrial organisms has demonstrated hyperactivity, shortness of breath, convulsions, and internal molecular changes following sulfolane exposure. However, relatively little information is available on the adverse impacts of sulfolane on aquatic organisms. This study investigates the adverse effects of sulfolane on morphological, behavioural and transcript abundance in developing zebrafish embryos. A wide range of concentrations (0 – 5000 µg·mL-1) were tested on survival, hatching, morphometric characteristics (yolk sac and pericardial edema, hemorrhaging, spinal malformations, swim bladder inflation), growth (larval length, condition factor, eye volume), yolk sac utilization, behavior (response to touch stimuli and light stimuli) and transcript abundances of a number of genes (ahr1a, cyp1a, thraa, dio1, dio2, dio3, 11βhsd2, gr, aqp3a, cyp19a1b, ddc, gria2b, hsp70). Minimum effective doses were different for morphometrics and growth parameters (800-1000 µg·mL-1), behaviour (200-500 µg·mL-1) and transcript abundance (10 µg·mL-1). The overall results provide novel information on the adverse effects of sulfolane on an aquatic vertebrate model organism, and a framework for better understanding of potential adverse health impacts of environmental levels of sulfolane in fish and other vertebrates.
Kondo lattice on the edge of a two-dimensional topological insulator
Creators: name: Maciejko, Joseph
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We revisit the problem of a single quantum impurity on the edge of a two-dimensional time-reversal invariant topological insulator and show that the zero temperature phase diagram contains a large local moment region for antiferromagnetic Kondo coupling which was missed by previous poor man's scaling treatments. The combination of an exact solution at the so-called decoupling point and a renormalization group analysis à la Anderson-Yuval-Hamann allows us to access the regime of strong electron-electron interactions on the edge and strong Kondo coupling. We apply similar methods to the problem of a regular one-dimensional array of quantum impurities interacting with the edge liquid. When the edge electrons are at half-filling with respect to the impurity lattice, the system remains gapless unless the Luttinger parameter of the edge is less than 1/2, in which case two-particle backscattering effects drive the system to a gapped phase with long-range Ising antiferromagnetic order. This is in marked contrast with the gapped disordered ground state of the ordinary half-filled one-dimensional Kondo lattice.
description: 18 pages, 3 figures; fixed typos, updated references
Double, Double Supertube Bubble
Creators: name: Bena, Iosif
name: de Boer, Jan
name: Shigemori, Masaki
name: Warner, Nicholas P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We argue that there exists a new class of completely smooth 1/8-BPS, three-charge bound state configurations that depend upon arbitrary functions of two variables. These configurations are locally 1/2-BPS objects in that if they form an infinite flat sheet then they preserve 16 supersymmetries but even with arbitrary two-dimensional shape modes they still preserve 4 supersymmetries. They have three electric charges and can be thought of the result of two successive supertube transitions that involve adding two independent dipole moments and giving rise to the arbitrary two-dimensional shape modes. We further argue that in the D1-D5-P duality frame this construction will give rise to smooth, horizonless solutions, or microstate geometries. We expect these solutions to be extremely important in the semi-classical and holographic descriptions of black-hole entropy.
description: v2: reference added. journal version
Limited Arbitrage is Necessary and Sufficient for the Existence of an Equilibrium
Creators: name: Chichilnisky, Graciela
Publisher: name: Columbia University
Year: 1996
Subjects: Economics

description: In 1991, in [1], [2] and in [8], I introduced the concept of global cone and used it to define a condition on endowments and preferences, "˜limited arbitrage', which I showed to be necessary and sufficient for the existence of a competitive equilibrium [8]. In response to a comment [19], I show here that the authors misunderstood my results by focusing on brief announcements which cover other areas, social choice [6] and algebraic topology [3], rather than on the publication which contains my proofs on equilibrium [8]. The comment's example is irrelevant to my results in [8] because it starts from different conditions. Limited arbitrage is always necessary and sufficient for the existence of a competitive equilibrium, with or without short sales, with the global cones as I defined them, and exactly as proved in [8].
Tailored Ensemble Approach for Stock Price Prediction
Creators: name: Dhaliwal, Manmeet
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: Tailored
subject: Ensemble
subject: Prediction
subject: Stock
subject: Price
subject: Regression
subject: Investment
subject: Analysis
subject: Machine Learning
subject: Technical Analysis
subject: Education--Business
subject: Education--Finance
subject: Computer Science

description: The stock market is one of the most vital components of a free-market economy, as it provides companies with access to capital in exchange for providing investors partial ownership. By trading in stocks, investors have an opportunity to earn capital gain and investment income. We focus on improving capital gains by tackling the challenge of stock price prediction. In this research, technical indicators were used to predict stock price. We proposed a Tailored Ensemble Approach (TEA) to improve accuracy. In this approach, various regression models (e.g. SVR, DT, etc.) were considered as base models. Also, multiple feature sets were developed to use to train each regression model. Our ensemble approach finds the combinations of regression models and feature sets, through a validation process, that best predicts future price for each stock. Once the set of combinations are constructed for each stock, a mean ensemble system is used to predict future price. S&P 100 stocks dataset, spanning from the beginning of 2007 to the end of 2016, was used to evaluate this research. After evaluation, using various configurations, the proposed system consistently outperformed all base regression models used in this study. It was also demonstrated that a customized approach which tailors a set of regression models and feature sets based on stock and prediction period has significant impact on improving the accuracy of the stock price prediction system.
Financing Decisions, CEO Managerial Skills and Corporate Tax Planning
Creators: name: Rashid, Harun Ur
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: dividend policy
subject: debt issuance
subject: share issuance
subject: CEO managerial skills
subject: tax avoidance
subject: Accounting

description: How do dividend policy, debt issuance, share issuance and CEO managerial skills affect corporate tax planning or tax avoidance? In my first essay, I investigate how dividend payout is related to proxies for tax avoidance, including cash effective tax rates (CASH-ETR) and book-tax differences (BTD). Dividend policy may lead to tax avoidance because dividends represent relatively fixed commitments to transfer cash to shareholders. I find that dividend payout is negatively related to CASH-ETR and positively related to BTD, indicating that dividend payout is associated with a tax avoidance strategy. In the second essay, I examine whether firms’ issuance of equity and debt securities are associated with cash savings through tax planning. I find that an increase in share issuance is associated with a decrease in cash effective tax rate (CASH-ETR), suggesting that firms that issue shares save cash by tax planning. I do not find any evidence that debt issuance reduces CASH-ETR or induce tax avoidance behavior. In the third essay, I study the relation between tax avoidance and general managerial skills acquired by CEOs through their lifetime work experience. Managerial skills are two types: general managerial skills which are transferable across firms and industries and specific managerial skills, which are valuable only to a specific firm or industry. Using OLS regression on a sample of S&P 1500 firms for 1993-2007 period, I find that CEOs with general managerial skills (generalist CEOs) tend to engage more in tax avoidance strategy compared to CEOs with specific managerial skills (specialist CEOs). This evidence implies that CEO managerial skills matter for corporate tax planning.
„Außerdem brauchen Sie Begabung“
Creators: name: Pokojski, Veronika
Publisher: name: KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Year: 2023

description: KULTEC – Magazin für Technik, Kultur und Museumsarbeit, Bd. 3 (2023): KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Bruneiplusia Jaschhof, gen. nov.
Creators: name: Jaschhof, Mathias
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Cecidomyiidae
Bruneiplusia

description: Genus Bruneiplusia Jaschhof gen. nov.
Type species, kaspraki sp. nov., here designated.
The genus Bruneiplusia is here introduced for a small, mostly pale yellow diallactiine with long eye bridge, the Haplusia type of venation, and distinctive male genitalia. Bruneiplusia is apparently closely related to Mikrostyles, another new genus from Brunei described in this paper, which shall be discussed under the heading of the latter.
Diagnosis. Most notably, the ejaculatory apodeme of Bruneiplusia has an excessively large head-like extension apically (↓, Fig. 3A). Parameres are not traceable as a discrete structure, but may be incorporated in that ‘head’. The elongate, pointed gonostylus, which is inserted ventrally on the gonocoxa, not posteriorly as is usually the case, has a setose process on the upper surface (↓, Fig. 3A) and a long blade-like tooth on the medial margin (↓). The gonocoxae have subtriangular lobes dorsoposteriorly (↓, Fig. 3A) and no ventral emargination (↓). Females of Bruneiplusia are unknown.
Etymology. The name is composed of Brunei -, with reference to the country of provenance of the type specimen, and - plusia, from Haplusia, a diallactiine genus with wing venation similar to Bruneiplusia. Gender of the name is feminine.
description: Published as part of Jaschhof, Mathias, 2016, A review of world Diallactiini (Diptera, Cecidomyiidae, Winnertziinae), with the description of six new genera and seventeen new species, pp. 201-244 in Zootaxa 4127 (2) on page 206, DOI: 10.11646/zootaxa.4127.2.1, http://zenodo.org/record/267022
A first estimate of triply heavy baryon masses from the pNRQCD perturbative static potential
Creators: name: Llanes-Estrada, Felipe J.
name: Pavlova, Olga I.
name: Williams, Richard
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Within pNRQCD we compute the masses of spin-averaged triply heavy baryons using the now-available NNLO pNRQCD potentials and three-body variational approach. We focus in particular on the role of the purely three-body interaction in perturbation theory. This we find to be reasonably small and of the order 25 MeV Our prediction for the Omega_ccc baryon mass is 4900(250) in keeping with other approaches. We propose to search for this hitherto unobserved state at B factories by examining the end point of the recoil spectrum against triple charm.
description: 18 figures, 21 pages
The Number of Group Homomorphisms from $D_m$ into $D_n$
Creators: name: Johnson, Jeremiah
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20D99

description: Counting homomorphisms between cyclic groups is a common exercise in a first course in abstract algebra. A similar problem, accessible at the same level, is to count the number of group homomorphisms from a dihedral group of order $2m$ into a dihedral group of order $2n$. While the solution requires only elementary group theory, the result does not appear in the literature or in the usual texts. As the solution may be of interest, particularly to those teaching undergraduate abstract algebra, it is provided in this note.
The Role of Absolute Continuity in "Merging of Opinions" and "Rational Learning"
Creators: name: Miller, Ronald I.
name: Sanchirico, Chris William
Publisher: name: Columbia University
Year: 1996
Subjects: Economics

description: Two agents with different priors watch a sequence unfold over time, updating their priors about the future course of the sequence with each new observation. Blackwell and Dubins (1962) show that the agents' opinions about the future will converge if their priors over the sequence space are absolutely continuous: i.e., if they agree on what events are possible. From this Kalai and Lehrer (1993) conclude that the players in a repeated game will eventually agree about the future course of play and thus that "rational learning leads to Nash equilibrium." We provide an alternative proof on convergence that clarifies the role of absolute continuity and in doing so casts doubt on the relevance of the result. From the existence of continued disagreement we construct a sequence of mutually favorable, uncorrelated "bets." By a law of large numbers, both agents are sure that they win these bets on average over the long run and this disagreement over what is possible violates absolute continuity.
Non-perturbative renormalization for general improved staggered bilinears
Creators: name: Lytle, Andrew T.
name: Sharpe, Stephen R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present results for non-perturbative renormalization (NPR) factors for staggered fermion bilinears of arbitrary spin and taste. We use "covariant" bilinears which transform irreducibly under the lattice translation and rotation group, and thus do not mix. We form ~ 30 ratios which have no anomalous dimensions, and compare the NPR results to those from 1-loop perturbation theory. We also compare the absolute renormalization factors (which, in general, do have anomalous dimensions) to 1-loop perturbation theory. We use asqtad and HYP-smeared staggered valence fermions on the coarse MILC asqtad lattices.
description: 7 pages, 3 figures, Contribution to the XXIX International Symposium on Lattice Field Theory, July 10-16, 2011, Squaw Valley, Lake Tahoe, California
Logical Conclusion
Creators: name: Blair, Kathryn Marie
Publisher: name: Arts
Year: 2018
Subjects: subject: installation
subject: Participatory
subject: Logic
subject: algorithms
subject: technology and society
subject: algocracy
subject: puzzles
subject: Fine Arts
subject: Computer Science

description: My work is focused on finding a way to talk about algorithms in society through art. I aim to create experiences that examine the status quo of our relationship with technology by throwing it into stark relief. My work looks to help visitors move from passive engagement with algorithmic systems, to active questioning of and engagement with them. This paper details the development of Logical Conclusion, a collection of logic puzzles based on algorithms that impact our society — from Trust Scores that the Chinese government is issuing to its citizens, to the Facebook news feed algorithm. The puzzles are presented on blackboards with magnetic tiles that visitors can manipulate to solve the puzzles, and accompanied by illustrations that underscore the absurdity of the puzzles. The blackboards are paired with a workbook of additional puzzles, which visitors can take away to complete. I invite visitors to step into the school for algorithms, where young computer programs come to complete their early logic training. Visitors can apply their logical faculties to the puzzles. Are the premises upon which the logical statements are based valid? Does the combination of premises lead to truly logical conclusions?
Polar codes for private classical communication
Creators: name: Wilde, Mark M.
name: Renes, Joseph M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We construct a new secret-key assisted polar coding scheme for private classical communication over a quantum or classical wiretap channel. The security of our scheme rests on an entropic uncertainty relation, in addition to the channel polarization effect. Our scheme achieves the symmetric private information rate by synthesizing "amplitude" and "phase" channels from an arbitrary quantum wiretap channel. We find that the secret-key consumption rate of the scheme vanishes for an arbitrary degradable quantum wiretap channel. Furthermore, we provide an additional sufficient condition for when the secret key rate vanishes, and we suspect that satisfying this condition implies that the scheme requires no secret key at all. Thus, this latter condition addresses an open question from the Mahdavifar-Vardy scheme for polar coding over a classical wiretap channel.
description: 11 pages, 2 figures, submission to the 2012 International Symposium on Information Theory and its Applications (ISITA 2012), Honolulu, Hawaii, USA
Tausende Zeichen, eine Maschine
Creators: name: Pister, Sarah
Publisher: name: KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Year: 2023

description: KULTEC – Magazin für Technik, Kultur und Museumsarbeit, Bd. 3 (2023): KULTEC – Magazin für Technik, Kultur und Museumsarbeit
High Throughput Heavy Hitter Aggregation
Creators: name: Polychroniou, Orestis
name: Ross, Kenneth A.
Publisher: name: Columbia University
Year: 2012
Subjects: Computer science

description: Heavy hitters are data items that occur at high frequency in a data set. Heavy hitters are among the most important items for an organization to summarize and understand during analytical processing. In data sets with sufficient skew, the number of heavy hitters can be relatively small. We take advantage of this small footprint to compute aggregate functions for the heavy hitters in fast cache memory. We design cache-resident, shared-nothing structures that hold only the most frequent elements from the table. Our approach works in three phases. It first samples and picks heavy hitter candidates. It then builds a hash table and computes the exact aggregates of these candidates. Finally, if necessary, a validation step identifies the true heavy hitters from among the candidates based on the query specification. We identify trade-offs between the hash table capacity and performance. Capacity determines how many candidates can be aggregated. We optimize performance by the use of perfect hashing and SIMD instructions. SIMD instructions are utilized in novel ways to minimize cache accesses, be- yond simple vectorized operations. We use bucketized and cuckoo hash tables to increase capacity, to adapt to different datasets and query constraints. The performance of our method is an order of magnitude faster than in-memory aggregation over a complete set of items if those items cannot be cache resident. Even for item sets that are cache resident, our SIMD techniques enable significant performance improvements over previous work.
Smooth Infinite Economics
Creators: name: Chichilnisky, Graciela
name: Zhou, Yuqing
Publisher: name: Columbia University
Year: 1996
Subjects: Economics

description: Equilibrium conditions in smooth infinite economies with separable utilities are described by Fredholm maps, which are Frechet differentiable. Therefore, Smale's extension of Sard's theorem can be used to studying infinite economies. We study structural stability and local uniqueness of equilibrium in smooth infinite economies and relate the theory of markets to modern Fredholm theory.
On the Dimension of the Group of Projective Transformations of Closed Randers and Riemannian Manifolds
Creators: name: Matveev, Vladimir S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We construct a counterexample to Theorem 2 of [Rafie-Rad M., Rezaei B., SIGMA 7 (2011), 085, 12 pages, arXiv:1108.6127].
Gender politics: The political salience of marriage
Creators: name: Edlund, Lena
name: Pande, Rohini
Publisher: name: Columbia University
Year: 2002
Subjects: Economics
Gender identity
Sex role

description: The last three decades have witnessed the rise of a political gender gap in the United States wherein more women than men favor the Democratic party. We trace this development to the decline in marriage, which we posit has made men richer and women poorer. Data for the United States support this argument. First, there is a strong positive correlation between state divorce prevalence and the political gender gap - higher divorce prevalence reduces support for the Democrats among men but not women. Second, longitudinal data show that following marriage (divorce), women are less (more) likely to support the Democratic party.
Blood telomere length in infants and their HIV-infected mothers exposed to antiretroviral therapy during pregnancy
Creators: name: Imam, Tuhina
Publisher: name: University of British Columbia
Year: 2011

description: Background/Objectives: Nucleoside reverse transcriptase inhibitors (NRTIs) are part of the antiretroviral therapy (ART) given to HIV-infected pregnant women to prevent vertical HIV transmission. The NRTI zidovudine (AZT) is a known inhibitor of human telomerase, the enzyme responsible for telomere elongation. We hypothesized that average telomere length (ATL) may be shorter in infants born to HIV-infected mothers and exposed to ART in utero, compared to ART-unexposed infants. Methods: Two independent cohorts of pregnant women and their infants were studied, spanning 1990-2000 (SJ) and 2005-2009 (Pregnancy). SJ included 120 HIV⁺ exposed and unexposed pregnancies while Pregnancy included 99 HIV⁺ highly active antiretroviral therapy (HAART)-exposed and HIV⁻ pregnancies. Dried blood spots (SJ) or whole blood (Pregnancy) were collected from the pregnant women and their infants. Relative ATL (rATL) was measured by quantitative PCR. The differences in rATL between HAART/ART-exposed and unexposed maternal, infant and cord blood (CB) were investigated using ANCOVA, adjusting for maternal age, gestational age, smoking (cigarette/marijuana) and illicit drug/methadone use ever in pregnancy. For the HIV/HAART group, additional parameters included CD4+ count, HIV plasma viral load near delivery, length of HAART exposure, HCV infection and ethnicity. Relationships between maternal and infant rATL were also investigated. Results: Infant rATL were significantly longer than maternal rATL for both cohorts (p<0.0001). Exposed CB rATL was shorter than controls (p=0.042) but the differences became non-significant after adjusting for covariates. Although a consistent pattern was seen whereby the rATL were 2-6% shorter in the exposed samples compared to the unexposed ones, this difference never reached statistical significance. In the SJ but not the Pregnancy cohort, smoking and illicit drug use in pregnancy were associated with shorter infant (p=0.033) and maternal (p=0.035) blood rATL. In the pregnancy cohort, among the HIV⁺ HAART-exposed, higher CD4+ count (p=0.047) and longer HIV duration (p=0.016) were independently associated with shorter maternal rATL. Maternal and infant rATL were significantly correlated (r=0.43, p=0.002) in the pregnancy but not in the SJ cohort. Conclusion: These results suggest that, if HIV and/or ART/HAART is a risk for telomere attrition in the context of this study, it is less important than other recognized risks.
Exchange-Correlation Asymptotics and High Harmonic Spectra
Creators: name: Mack, Michael
name: Whitenack, Daniel
name: Wasserman, Adam
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: This paper has been withdrawn by the authors; the main conclusion is incorrect, as some of the crucial calculations were not properly converged.
description: This paper has been withdrawn
Artur Scholz
Creators: name: Keller, Anke
Publisher: name: KULTEC – Magazin für Technik, Kultur und Museumsarbeit
Year: 2023

description: KULTEC – Magazin für Technik, Kultur und Museumsarbeit, Bd. 3 (2023): KULTEC – Magazin für Technik, Kultur und Museumsarbeit