cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Accurate Solution of Certain Continuous Problems Using Only Single Precision
Creators: name: Jankowski, Michal
name: Wozniakowski, Henryk
Publisher: name: Columbia University
Year: 1983
Subjects: subject: Computer science
subject: Mathematics
subject: FOS: Mathematics

description: A typical approach for finding the approximate solution of a continuous problem is through discretization with meshsize h such that the truncation error goes to zero with h. The discretization problem is solved in floating point arithmetic. Rounding-errors spoil the theoretical convergence and the error may even tend to infinity. In this paper we present algorithms of moderate cost which use only single precision and which compute the approximate solution of the integration and elliptic equation problems with full accuracy. These algorithms are based on the modified Gill-Møller algorithm for summation of very many terms, iterative refinement of a linear system with a special algorithm for the computation of residuals in single precision and on a property of floating point subtraction of nearby numbers.
Effects of aquifer heating on groundwater chemistry with a review of arsenic and its mobility
Creators: name: Fennell, Jonathan W.
Publisher: name: University of Calgary
Year: 2008

description: Bibliography: p. 313-330
description: This research project was designed to assess changes to solution chemistry due to localized heating of a fresh water aquifer. Sediments collected from the test aquifer were subjected to controlled laboratory experiments to assess arsenic release at increasing temperatures. Release occurred at, or near, 50°C. An activation energy of 11.6 kcal/mol was determined - consistent with physical desorption, mineral dissolution and mineral dissolution via surface reaction controls. When exposed to fresh aquifer sediment arsenic was removed from aqueous solution, indicating attenuation capacity for the sediment. Sequential soil extraction indicated amorphous Fe and Al hydrous oxides as the controlling fraction. Sediment mineralogy identified Fe-rich smectite and amorphous Goethite as the likely sources and sinks. Release of arsenic attenuated to fresh sediment occurred more easily at lower temperature (20°C) indicating formation of weaker bonds with mineral solids as opposed to natural conditions. Monitoring wells installed as part of the field experiment identified increasing concentrations of sodium, calcium, potassium, magnesium, barium and strontium at elevated groundwater temperatures. Similar results were noted for chloride, silica, sulphate, bicarbonate, boron, arsenic and molybdenum. Average Ea values ranged from 1.2 to 10.3 kcal/mol, with a value of 8.1 kcal/mol being noted for arsenic. In contrast, iron, manganese, pH and redox decreased. These findings, in conjunction with dissolved gases, stable isotopes and microbial enumeration tests, support the occurrence of ligandpromoted and microbially-enhanced mineral dissolution and precipitation reactions. Arsenic mobility in the test aquifer was identified to be at a slower rate than the groundwater flow. Similar results were indicated for other mobilized constituents; however, relative rates were slightly different. A retardation factor (Rr) of 1.6 was identified for arsenic, which is considerably lower than calculated values (8.4 to 31) derived from laboratory tests. Geochemical modeling supports release and adsorption of arsenic by active clay mineral surfaces; therefore, lack of these attenuating minerals in portions of the aquifer facilitating active groundwater flow is the likely reason. Arsenic was also identified in an iron monosulphide mineral retrieved from one well. In addition to hydrodynamic dispersion, sorption and mineral precipitation reactions are thus implicated in the attenuation process.
Is Gauss quadrature optimal for analytic functions?
Creators: name: Kowalski, M. A.
name: Werschulz, Arthur G.
name: Wozniakowski, Henryk
Publisher: name: Columbia University
Year: 1983
Subjects: subject: Computer science
subject: Mathematics
subject: FOS: Mathematics

description: We consider the problem of optimal quadratures for integrands f: [ -1 , 1 ] → R which have an analytic extension f to an open disk D, of radius r about the origin such that |f| â‰¤ 1 on Dr. If r = 1, we show that the penalty for sampling the integrand at zeros of the Legendre polynomial of degree n rather than at optimal points, tends to infinity with n. In particular there is an "infinite" penalty for using Gauss quadrature. On the other hand, if r > l, Gauss quadrature is almost optimal. These results hold for both the worst-case and asymptotic settings.
Cyphomyrmex castagnei Mackay & Baena 1993
Creators: name: Mera-Rodríguez, Daniela
name: Serna, Francisco
name: Sosa-Calvo, Jeffrey
name: Lattke, John
name: Rabeling, Christian
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Cyphomyrmex
Cyphomyrmex castagnei

description: (19) Cyphomyrmex castagnei Mackay & Baena, 1993 Material examined. COLOMBIA: Nariño • 1 worker; Ricaurte; 01°13′35″N, 078°03′04″W; alt. 920 m; 21 Sep. 2015; J. Cancino leg.; UNAB 4748. Identification. Mandible with five teeth; lateral cor- ner of cephalic vertex with long horn-like extensions; mesosoma with a large, spine-like posterior pronotal tubercle and a large anterior mesonotal tubercle; mesonotal protuberances spine like; and mesosoma with squamate hairs (Mackay and Baena 1993). Distribution.Cyphomyrmex castagnei is only known from Panama and the Pacific coast of Colombia (Fig. 1B) (MacKay and Baena 1993; Fernández et al. 1996; Fernández and Sendoya 2004).
description: Published as part of Mera-Rodríguez, Daniela, Serna, Francisco, Sosa-Calvo, Jeffrey, Lattke, John & Rabeling, Christian, 2020, A checklist of the non-leaf-cutting fungus-growing ants (Hymenoptera, Formicidae) from Colombia, with new biogeographic records, pp. 1205-1227 in Check List 16 (5) on pages 1213-1214, DOI: 10.15560/16.5.1205, http://zenodo.org/record/4059086
description: {"references": ["Mackay W, Baena ML (1993) Anew \" Horned \" Fungus Growing Ant, Cyphomyrmex castagnei, from Colombia (Hymenoptera: Formicidae). Sociobiology 23 (1): 31 - 37.", "Fernandez F, Baena ML, Palacio EE (1996) Hormigas de Colombia V: el genero Stenamma Westwood. Tacaya 5: 9 - 10.", "Fernandez F, Sendoya S (2004) Synonymic list of Neotropical ants (Hymenoptera: Formicidae). Biota Colombiana 5 (1): 3 - 105."]}
Nonadiabatic quantum chaos in atom optics
Creators: name: Prants, S. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Coherent dynamics of atomic matter waves in a standing-wave laser field is studied. In the dressed-state picture, wave packets of ballistic two-level atoms propagate simultaneously in two optical potentials. The probability to make a transition from one potential to another one is maximal when centroids of wave packets cross the field nodes and is given by a simple formula with the single exponent, the Landau--Zener parameter $κ$. If $κ\gg 1$, the motion is essentially adiabatic. If $κ\ll 1$, it is (almost) resonant and periodic. If $κ\simeq 1$, atom makes nonadiabatic transitions with a splitting of its wave packet at each node and strong complexification of the wave function as compared to the two other cases. This effect is referred as nonadiabatic quantum chaos. Proliferation of wave packets at $κ\simeq 1$ is shown to be connected closely with chaotic center-of-mass motion in the semiclassical theory of point-like atoms with positive values of the maximal Lyapunov exponent. The quantum-classical correspondence established is justified by the fact that the Landau--Zener parameter $κ$ specifies the regime of the semiclassical dynamical chaos in the map simulating chaotic center-of-mass motion. Manifestations of nonadiabatic quantum chaos are found in the behavior of the momentum and position probabilities.
description: arXiv admin note: substantial text overlap with arXiv:1201.0326
Application of a Bayesian Method to Absorption Spectral-Line Finding in Simulated ASKAP Data
Creators: name: Allison, J. R.
name: Sadler, E. M.
name: Whiting, M. T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The large spectral bandwidth and wide field of view of the Australian SKA Pathfinder radio telescope will open up a completely new parameter space for large extragalactic HI surveys. Here we focus on identifying and parametrising HI absorption lines which occur in the line of sight towards strong radio continuum sources. We have developed a method for simultaneously finding and fitting HI absorption lines in radio data by using multi-nested sampling, a Bayesian Monte Carlo algorithm. The method is tested on a simulated ASKAP data cube, and is shown to be reliable at detecting absorption lines in low signal-to-noise data without the need to smooth or alter the data. Estimation of the local Bayesian evidence statistic provides a quantitative criterion for assigning significance to a detection and selecting between competing analytical line-profile models.
description: 8 pages, 5 figures and 1 table; accepted for publication in PASA
Optical surface edge Bloch modes: low-loss subwavelength-scale 2D light localization
Creators: name: Su, Shu-Yu
name: Yoshie, Tomoyuki
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Edge modes of a finite-size woodpile can appear within a complete bandgap on an <010> edge. The mode area is as small as 0.066 squared half-in-vacuum-wavelengths, and the propagation loss is small. The field maxima occur at a dielectric-vacuum interface, like at a metal-dielectric interface for surface plasmon modes. The edge mode is a subwavelength-scale 2D light localization mode in non-metallic materials. Analysis of two-mode co-directional coupling between identical surface Bloch modes suggests that a large photonic crystal or surface designing would be needed for suppressing the evanescent field coupling in the woodpile.
Colorado water, December 2020
Creators: name: Kallenberger, Julie
name: Lipscomb, Beth
name: Colorado Water Center, Publisher
Publisher: name: Mountain Scholar
Year: 2020
Subjects: subject: Water resources development -- Colorado
subject: Water use -- Colorado
subject: Water-supply -- Colorado
subject: Water-supply -- Management -- Colorado

description: The newsletter is devoted to highlighting water research and activities at CSU and throughout Colorado.
description: Newsletter of the Colorado Water Center. Theme: 2019-2020 project reports.
A Sparsity-Aware Adaptive Algorithm for Distributed Learning
Creators: name: Chouvardas, Symeon
name: Slavakis, Konstantinos
name: Kopsinis, Yannis
name: Theodoridis, Sergios
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, a sparsity-aware adaptive algorithm for distributed learning in diffusion networks is developed. The algorithm follows the set-theoretic estimation rationale. At each time instance and at each node of the network, a closed convex set, known as property set, is constructed based on the received measurements; this defines the region in which the solution is searched for. In this paper, the property sets take the form of hyperslabs. The goal is to find a point that belongs to the intersection of these hyperslabs. To this end, sparsity encouraging variable metric projections onto the hyperslabs have been adopted. Moreover, sparsity is also imposed by employing variable metric projections onto weighted $\ell_1$ balls. A combine adapt cooperation strategy is adopted. Under some mild assumptions, the scheme enjoys monotonicity, asymptotic optimality and strong convergence to a point that lies in the consensus subspace. Finally, numerical examples verify the validity of the proposed scheme, compared to other algorithms, which have been developed in the context of sparse adaptive learning.
Biological Monitoring of New Jersey's Nearshore Ocean Waters June 1977 to June 1978
Creators: name: No Name Supplied
Publisher: name: No Publisher Supplied
Year: 1978

description: During the summer of 1976, a layer of anoxic water existed in an area of over 3,000 square miles of the New Jersey Coast. The anoxic condition resulted in massive shellfish kills, disrupted fish migrations and caused serious financial losses to commercial fishermen (NOAA 1977, Eimchak 1977). Although investigations suggested that the anoxic condition was caused by unusually warm weather conditions, the lack of storms and a bloom of Ceratium tripos, it was generally agreed that information on normal ocean water conditions in the New York Bight is lacking and that the impact of pollution on waters of the bight is poorly understood. Realizing these shortcomings, New Jersey appropriated $50,000 to the Division of Fish, Game and Shellfisheries to monitor dissolved oxygen, nutrient, organic carbon and plankton levels of New Jersey's coastal ocean waters during the period July 1977 through June 1978. The purpose of this report is to document the data collected by the Division and to present a preliminary interpretation of its meaning.
Feature Interactions in Internet Telephony End Systems
Creators: name: Wu, Xiaotao
name: Schulzrinne, Henning G.
Publisher: name: Columbia University
Year: 2004
Subjects: Computer science

description: Internet telephony end systems can offer many services. Different services may interfere with each other, a problem which is known as feature interaction. The feature interaction problem has existed in telecommunication systems for many years. The introduction of Internet telephony helps to solve some interaction problems due to the richness of its signaling information. However, many new feature interaction problems are also introduced in Internet telephony systems, especially in end systems, which are usually dumb in PSTN systems, but highly functional in Internet telephony systems. Internet telephony end systems, such as SIP soft-agents, can run on personal computers. The soft-agents can then perform call control and many other functions, such as presence information handling, instant messaging, and network appliance control. These new functionalities make the end system feature interaction problems more complicated. In this paper, we investigate ways features interact in Internet telephony end systems and propose a potential solution for detecting and avoiding feature interactions. Our solutions are based on the Session Initiation Protocol (SIP) and the Language for End System Services (LESS), which is a markup language specifically for end system service creation.
Colorado water, June 1996
Creators: name: Miller, Shirley
name: Colorado Water Resources Research Institute, Publisher
Publisher: name: Mountain Scholar
Year: 1996
Subjects: subject: Water resources development -- Colorado
subject: Water-supply -- Colorado
subject: Water use -- Colorado
subject: Water-supply -- Management -- Colorado

description: The scope of the newsletter is devoted to enhancing communication between Colorado water users and managers and faculty at the research universities in the state.
description: Newsletter of the Colorado Water Resources Research Institute.
Table S1 List of Bycatch species
Creators: name: Puentes, Vladimir
name: Barragan Barrera, Dalia C.
name: Bohrer Do Amaral, Karina
name: Escobar, Fabian D.
name: Zapata, Luis A.
name: Zambrano, Emiliano
name: Barreto, Carlos G.
name: Tavera, José
name: Polo, Carlos J.
name: Altamar, Jairo
name: Moreno, Angelica S.
name: Benavides, Ivan F.
Publisher: name: Zenodo
Year: 2023
Subjects: Bycatch
Purse seine Fishery
Colombian Pacific Ocean

description: List of bycatch species recorded in the Tuna purse-seine fisheries in the Colombian Pacific Ocean between 2000 and 2019.
Cyphomyrmex cornutus Kempf 1968
Creators: name: Mera-Rodríguez, Daniela
name: Serna, Francisco
name: Sosa-Calvo, Jeffrey
name: Lattke, John
name: Rabeling, Christian
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Cyphomyrmex
Cyphomyrmex cornutus

description: (20) Cyphomyrmex cornutus Kempf, 1968 Figure 5G, HMaterial examined. COLOMBIA: Chocó • 7 work- ers; Lloró; 05°30′00″N, 076°31′00″W; alt. 90 m; 25 Oct. 2000; J. Neita leg.; UNAB 545, MEFLG 6936. Identification. Cephalic and mesonotal protuberances horn-like; preocular carina curves above eye; frontal lobes broadly expanded, semicircular; pronotum without median paired denticles, humeral prominence weakly developed and postero-lateral tubercle more developed, antero-ventral corner rectangular; and mesonotum with anterior pair of very prominent spines and posterior pair of very low denticles (Kempf 1968). Distribution.Cyphomyrmex cornutus is widely distributed in Central and South America. It has been recorded from Veracruz state in Mexico, south to Costa Rica, Co- lombia, Ecuador, French Guiana, and the Brazilian states of Acre and Bahia. This ample and somewhat disjunct distribution suggests that C. cornutus might have a con- tinuous distribution throughout Central America and northern South America (Adams and Longino 2007; Mi- randa et al. 2012; Vergara-Navarro and Serna 2013; San- tos et al. 2017).
description: Published as part of Mera-Rodríguez, Daniela, Serna, Francisco, Sosa-Calvo, Jeffrey, Lattke, John & Rabeling, Christian, 2020, A checklist of the non-leaf-cutting fungus-growing ants (Hymenoptera, Formicidae) from Colombia, with new biogeographic records, pp. 1205-1227 in Check List 16 (5) on page 1215, DOI: 10.15560/16.5.1205, http://zenodo.org/record/4059086
description: {"references": ["Kempf WW (1968) Anew species of Cyphomyrmex from Colombia, with further remarks on the genus (Hymenoptera, Formicidae). Revista Brasileira de Biologia 28 (1): 35 - 41. https: // doi. org / 10.15468 / EFWP 0 J", "Adams RMM, Longino JT (2007) Nesting biology of the arboreal fun- gus-growing ant Cyphomyrmex cornutus and behavioral inter- actions with the social-parasitic ant Megalomyrmex mondabora. Insectes Sociaux 54: 136 - 143. https: // doi. org / 10.1007 / s 00040 - 007 - 0922 - 0", "Vergara-Navarro EV, Serna F (2013) Achecklist of the ants (Hyme- noptera: Formicidae) of the department of Antioquia, Colombia and new records for the country. Agronomia Colombiana 31 (3): 324 - 342."]}
Nonlinear realizations, the orbit method and Kohn's theorem
Creators: name: Andrzejewski, K.
name: Gonera, J.
name: Kosinski, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The orbit method is used to describe the centre of mass motion of the system of particles with fixed charge to mass ratio moving in homogeneous magnetic field and confined by harmonic potential. The nonlinear action of symmetry group on phase space is identified and compared with the one obtained with the help of Eisenhart lift.
description: 8 pages; few references added
Multiple-channel generalization of Lellouch-Luscher formula
Creators: name: Hansen, Maxwell T.
name: Sharpe, Stephen R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We generalize the Lellouch-Luscher formula, relating weak matrix elements in finite and infinite volumes, to the case of multiple strongly-coupled decay channels into two scalar particles. This is a necessary first step on the way to a lattice QCD calculation of weak decay rates for processes such as D -> pi pi and D -> KK. We also present a field theoretic derivation of the generalization of Luscher's finite volume quantization condition to multiple two-particle channels. We give fully explicit results for the case of two channels, including a form of the generalized Lellouch-Luscher formula expressed in terms of derivatives of the energies of finite volume states with respect to the box size. Our results hold for arbitrary total momentum and for degenerate or non-degenerate particles.
description: 16 pages, 2 figures. v3: Added references, clarified relation to and corrected comments about previous work, and minor stylistic improvements. v4: Minor clarifications added, typos fixed, references updated---matches published version
Experimental demonstration of wakefield effects in a THz planar diamond accelerating structure
Creators: name: Antipov, S.
name: Jing, C.
name: Kanareykin, A.
name: Butler, J. E.
name: Yakimenko, V.
name: Fedurin, M.
name: Kusche, K.
name: Gai, W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We have directly measured THz wakefields induced by a subpicosecond, intense relativistic electron bunch in a diamond loaded accelerating structure via the wakefield acceleration method. We present here the beam test results from the first diamond based structure. Diamond has been chosen for its high breakdown threshold and unique thermoconductive properties. Fields produced by a leading (drive) beam were used to accelerate a trailing (witness) electron bunch which followed the drive bunch at a variable distance. The energy gain of a witness bunch as a function of its separation from the drive bunch describes the time structure of the generated wakefield.
description: v3, accepted by APL. Updated to reflect reviewers' comments
Linear Approximation of Optimal Attempt Rate in Random Access Networks
Creators: name: Chang, Hoon
name: Misra, Vishal
name: Rubenstein, Daniel Stuart
Publisher: name: Columbia University
Year: 2006
Subjects: Computer science

description: While packet capture has been observed in real implementations of wireless devices randomly accessing shared channels, fair rate control algorithms based on accurate channel models that describe the phenomenon have not been developed. In this paper, using a general physical channel model, we develop the equation for the optimal attemp rate to maximize the aggregate log utility. We use the least squares method to approximate the equation to a linear function of the attempt rate. Our analysis on the approximation error shows that the linear function obtained is close enough to the original with the square of the residuals more than 0.9.
Structural Investigation of InAs-AlInAs and InAs-AlInP Core-Shell Nanowires
Creators: name: Haapamaki, C. M.
name: Baugh, J.
name: LaPierre, R. R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: InAs nanowires were grown on GaAs substrates by the Au-assisted vapour-liquid-solid (VLS) method in a gas source molecular beam epitaxy (GS-MBE) system. Passivation of the InAs nanowires using InP shells proved difficult due to the tendency for the formation of axial rather than core-shell structures. To circumvent this issue, Al$_x$In$_{1-x}$As or Al$_x$In$_{1-x}$P shells with nominal Al composition fraction of x = 0.20, 0.36, or 0.53 were grown by direct vapour-solid deposition on the sidewalls of the InAs nanowires. Characterization by transmission electron microscopy revealed that the addition of Al in the shell resulted in a remarkable transition from the VLS to the vapour-solid growth mode with uniform shell thickness along the nanowire length. Possible mechanisms for this transition include reduced adatom diffusion, a phase change of the Au seed particle and surfactant effects. The InAs-AlInP core-shell nanowires exhibited misfit dislocations, while the InAs-AlInAs nanowires with lower strain appeared to be free of defects.
Controlling Window Protocols for Time-Constrained Communication in a Multiple Access Environment
Creators: name: Kurose, James F.
name: Schwartz, Mischa
name: Yemini, Yechiam
Publisher: name: Columbia University
Year: 1983
Subjects: Computer science

description: For many time-constrained communication applications, such as packetized voice, a critical performance measure is the percentage of messages which are transmitted within a given amount of time after their arrival at a sending station. We examine the use of a group random access protocol based on time windows for achieving time-constrained communication in a multiple access environment. First, we formulate a policy for controlling protocol operation in order to minimize the percentage of messages with waiting times greater than some given bound. A semi-Markov decision model is then developed for protocol operation and three of the four optimal control elements of this policy are then determined. Although the semi-Markov decision model can also be used to obtain performance results, the procedure is too computationally expensive to be of practical use. Thus, an alternate performance model based on a centralized queueing system with impatient customers is developed. Protocol performance under the optimal elements of the control policy shows significant improvements over cases in which the protocol is not controlled in this manner. Simulation results are also presented to corroborate the analytic results.
Colorado water, October 1994
Creators: name: Miller, Shirley
name: Colorado Water Resources Research Institute, Publisher
Publisher: name: Mountain Scholar
Year: 1994
Subjects: subject: Water resources development -- Colorado
subject: Water-supply -- Colorado
subject: Water use -- Colorado
subject: Water-supply -- Management -- Colorado

description: The scope of the newsletter is devoted to enhancing communication between Colorado water users and managers and faculty at the research universities in the state.
description: Newsletter of the Colorado Water Resources Research Institute.
Pediatric consultation liaison : characteristics and considerations for training in evidence-based practices
Creators: name: Bowling, Amanda Ann
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Pediatric consultation-liaison
Characterization
Evidence-based practice elements

description: Consultation-liaison services are an integral part of many pediatric hospital settings, yet characteristics of this patient population have not been extensively documented. The current study is a retrospective one-year chart review of the consultation-liaison service at a local pediatric hospital, Dell Children’s Medical Center (DCMC). The purpose of this study is trifold: (1) to characterize the CL population at Dell Children’s Medical Center (DCMC); (2) to examine the relationship between time-to-initial consult (TTIC) and hospitalization length to test the hypothesis that delayed TTIC lengthens overall stay; and (3) to identify preliminary evidence-based practices that should be considered for CL provider training. Knowledge about evidence-based practice elements that overlap with the characteristics of consultation-liaison patient populations may inform trainings for consultation-liaison staff. This would help to ensure that youth seen in hospital consultation-liaison services are getting the best available services, which is even more critical with the shortened time frame available to work with this patient population
Performance Analysis of Two Competing DADO PE Designs
Creators: name: Miranker, Daniel P.
Publisher: name: Columbia University
Year: 1983
Subjects: Computer science

description: In parallel processing, useful computation is performed by having a number or processors computing values and communicating these results to neighboring processors. It is a crucial design issue in any parallel processing architecture to determine the optimal balance or resources for competing requirements of typical problems to be solved by the device, i.e. computation versus communication. For example, in a highly parallel machine consisting of many individual processing elements (PE's), there is a trade ofr between the complexity of the constituent PE's and the number of such elements which may be embedded in a fixed silicon area. Part or the PE's circuitry must be dedicated to communication processing. Increasing the ability and the speed at which a PE can perform communication can be done, but only at the expense or the number of processors on a chip. DADO is a large scale VLSI computer designed for the rapid execution of AI production systems. This paper analyses the nature of the instruction stream expected to be executed on DADO for production system applications, with emphasis placed on the number or processors in the machine and the size of the problem. We describe four different proposed methods of handling I/O and their queueing network models. The models were carefully simulated to determine which I/O scheme and its resulting circuit complexity is best suited (most efficient) with respect to the DADO instruction stream.
An exploration of modeling and control methods for bipedal humanoid robots
Creators: name: Cruz, Melissa Jordan
Publisher: name: The University of Texas at Austin
Year: 2023
Subjects: Bipedal
Centroidal dynamics
Reinforcement learning

description: Two whole-body motion planning and control methods are presented in this report: trajectory generation and tracking using Centroidal Dynamics and optimization methods and using Reinforcement Learning (RL). Centroidal Dynamics utilizes a simplified model of the robot by assuming that all of the robot’s mass is located at the center of mass of the robot. This assumption greatly reduces the computational cost at the expense of a less accurate robot model. The RL trajectory generation and control is implemented using NVIDIA’s Isaac Gym environment. Isaac Gym massively parallelizes computation by using available GPUs, greatly decreasing computation time, making it a useful tool to develop standing and walking policies using RL on humanoid robots. Both methods produced trajectories that resulted in stable XY-planar movement. The Centroidal Dynamics method produced more promising results, with stable Z movement. More work should be done on the RL method regarding reward tuning.
Modeling of A Cracked Concrete Beam Repaired with FRP
Creators: name: Achour Aida
name: Bahar Sadek
name: Zelmat Yassine
Publisher: name: Zenodo
Year: 2024
Subjects: Concrete Beam, Crack, Composite Materials, Stress Intensity Factor, Vonmises Stress.

description: Abstract

The load capacity of concrete structures is affected by the cracking behaviour of concrete. Since the tensile strength of concrete is much lower than its compressive strength (approximately 10 times), concrete belongs to the group of brittle materials but it is not perfectly brittle. Since concrete is thought to be a quasi-brittle material, the study of failure and crack formation in concrete beams is addressed in this work. The code calculate ABAQUS was utilized in the current study, which is numerical in nature, to discretize the model utilizing the MEF approach. Its goal is to comprehend how fractured concrete beams reinforced with various composite materials behave. In addition to failure factors of the structure's behaviour like Von Mises stress and stress intensity factor, other variations of Patch reinforcement have been examined.
On the management of distributed learning agents
Creators: name: Prodromidis, Andreas L.
Publisher: name: Columbia University
Year: 1997
Subjects: Computer science

description: This thesis research concentrates on the problem of managing a distributed collection of intelligent learning agents across large and distributed databases. The main challenge is to identify and address the issues related to the efficiency, scalability,adaptivity and compatibility of these agents and the design and implementation of a complete and coherent distributed meta-learning system for large scale data mining applications. The resulting system should be able to scale with many large databases and make effective use of the available system resources. Furthermore, it should be capable to adapt to changes in its computational environment and be flexible enough to circumvent variances in database schema definitions. In this thesis proposal we present the architecture of JAM(Java Agents for Meta-learning),a distributed data mining system, and we describe in detail several methods to cope with the issues of scalability, efficiency, adaptivity and compatibility. Through experiments, performed on actual credit card and other public domain data sets, we evaluate the effectiveness and performance of our approaches and we demonstrate their potential.
Does Increased Regularity Lower Complexity?
Creators: name: Werschulz, Arthur G.
Publisher: name: Columbia University
Year: 1982
Subjects: Computer science

description: Intuitively, the more regular a problem, the easier it should be to solve. Examples drawn from ordinary and partial differential equations, as well as from approximation, support the intuition. Traub and Wozniakowski conjectured that this is always the case. In this paper, we study linear problems. We prove a weak form of the conjecture, and show that this weak form cannot be strengthened. To do this, we consider what happens to the optimal error when regularity is increased. If regularity is measured by a Sobolev norm, increasing the regularity improves the optimal error, which allows us to establish the conjecture in the normed case. On the other hand, if regularity is measured by a Sobolev semi-norm, it is no longer true that increasing the regularity improves the optimal error. However, a "shifted" version of this statement holds, which enables us to establish the conjecture in the semi-normed case.
Constraints on the origin of ultra-high-energy cosmic rays from cosmogenic neutrinos and photons
Creators: name: Decerprit, Guillaume
name: Allard, Denis
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the production of cosmogenic neutrinos and photons during the extragalactic propagation of ultra-high-energy cosmic rays (UHECRs). For a wide range of models in cosmological evolution of source luminosity, composition and maximum energy we calculate the expected flux of cosmogenic secondaries by normalizing our cosmic ray output to experimental spectra and comparing the diffuse flux of GeV-TeV gamma-rays to the experimental one measured by the Fermi satellite. Most of these models yield significant neutrino fluxes for current experiments like IceCube or Pierre Auger. Furthermore, we discuss the possibilities of signing the presence of UHE proton sources either within or outside the cosmic ray horizon using neutrinos or photons observations even if the cosmic ray composition becomes heavier at the highest energies. We discuss the possible constraints that could be brought on the UHECR origin from the different messengers and energy ranges.
description: 17 pages, 13 figures, published in Astronomy & Astrophysics
Apterostigma angustum Lattke 1997
Creators: name: Mera-Rodríguez, Daniela
name: Serna, Francisco
name: Sosa-Calvo, Jeffrey
name: Lattke, John
name: Rabeling, Christian
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Apterostigma
Apterostigma angustum

description: (1) Apterostigma angustum Lattke, 1997 Figure 2A, BMaterial examined. COLOMBIA: Antioquia • 4 work- ers; Amalfi; 06°46′66″N, 075°06′42″W; alt. 1045 m; 25 Jun. 1997; F. Sernaleg.; UNAB 4365; Antioquia • 6 workers; Amalfi; 06°51′26″N, 075°07′32″W; alt. 1000 m; 30 Jul. 1997; F. Sernaleg.; MEFLG 5786; Antioquia • 2 workers; Amalfi; 06°45′42.43″N, 075°05′28.31″W; alt. 1221 m; Sep. 2006; M. A. Vanegas leg.; MEFLG 11086; Antioquia • 2 workers; Santafé de Antioquia; 06° 33′41″N, 075°49′54″W; alt. 600 m; 06 Oct. 2000; E. Ver- gara, F. Sernaleg.; UNAB 4738; Antioquia • 12 gy- nes, 20 workers; Amalfi; 06°51′26″N, 075°07′32″W; alt. 1000 m; 30 Jul. 1997; F. Sernaleg.; MEFLG 5786; Atlántico • 1 worker; Juan de Acosta; 10°46′02″N, 075° 02′34″W; alt. 117–250 m; Feb.–May 2012; J. Castro, S. Royero leg.; UNAB 5457; Caquetá • 8 workers; Floren- cia; 01°37′11″N, 075°36′14″W; alt. 300 m; 31 Mar. 2016; F. Sernaleg.; UNAB 4365; Chocó • 1 worker; Lloró; 05° 29′00″N, 076°32′00″W; alt. 115 m; 04 Mar. 2001; J. Neita leg.; UNAB 4366; Chocó • 4 workers; Lloró; 05°29′00″N, 076°32′00″W; alt. 115 m; 03 Nov. 2000; J. Neita leg.; UNAB 4366; Sucre • 1 worker; Ovejas; 09°32′4.1″N, 075° 13′18.5″W; alt. 277 m; 4 Feb. 2016; H. Cadena leg.; ME- FLG 40895. Identification. Frontal lobes in frontal view triangular; general cephalic profile in lateral view ovoid; compound eyes relatively small; and ventral mesopleural carina (epicnemial carina of Serna and Mackay 2010) absent (Lattke 1997). Distribution. The specimens found in Colombia are all new records for the country as well as a major range ex- pansion to the west (Fig. 1A) as Apterostigma angustum was only known from Venezuela and French Guiana (Lattke 1997; Fernández and Sendoya 2004).
description: Published as part of Mera-Rodríguez, Daniela, Serna, Francisco, Sosa-Calvo, Jeffrey, Lattke, John & Rabeling, Christian, 2020, A checklist of the non-leaf-cutting fungus-growing ants (Hymenoptera, Formicidae) from Colombia, with new biogeographic records, pp. 1205-1227 in Check List 16 (5) on page 1208, DOI: 10.15560/16.5.1205, http://zenodo.org/record/4059086
description: {"references": ["Lattke JE (1997) Revision del genero Apterostigma Mayr: (Hymenoptera: Formicidae). Arquivos de Zoologia 34 (5): 121 - 221. https: // doi. org / 10.11606 / issn. 2176 - 7793. v 34 i 5 p 121 - 221", "Serna F, Mackay W (2010) Adescriptive morphology of the Ant Ge- nus Procryptocerus (Hymenoptera: Formicidae). Journal of In- sect Science 10 (111): 1 - 36. https: // doi. org / 10.1673 / 031.010.11101", "Fernandez F, Sendoya S (2004) Synonymic list of Neotropical ants (Hymenoptera: Formicidae). Biota Colombiana 5 (1): 3 - 105."]}
The construction of intimate partner woman abuse in Alberta's child protection policy and the impact on abused mothers and their children
Creators: name: Nixon, Kendra L.
Publisher: name: Social Work
Year: 2009

description: Bibliography: p. 246-285
description: Although women are most frequently the direct victims of intimate partner violence, there is growing evidence that children exposed to intimate partner woman abuse may also be affected. The increased attention to children's exposure has prompted child protection authorities to make changes to their policies, in an attempt to protect children. Despite the well-intentioned nature of these efforts, they have been criticized for producing negative consequences, such as, re-victimizing battered women, ignoring abusive men, and failing to protect children. Few studies have assessed the impact of these policy changes, especially from the standpoint of abused mothers. This study explores how children's exposure to intimate partner woman abuse has been represented within Alberta child protection policy and the impact on abused mothers and their children. An extensive review of government documents on family violence and children's exposure reveals that Alberta represents children's exposure in problematic ways, including considering all children who witness iolence as suffering eriou and long-lasting harm. Additionally, the Alberta government represents intimate partner woman abuse within a degendered discourse of family violence, in which structural factors are ignored. The study also examines the consequences of such policy representations on mothers and their children through in-depth interviews with 13 mothers who had contact with child protection because of their abuse by intimate partners. Most of the women considered the involvement to be unhelpful, intrusive, and punitive, as they were often treated as bad mothers who could not protect their children. Many experienced tremendous feelings of grief and loss and felt that they had lost their identity as mothers, especially after their children were apprehended. Participants experienced significant levels of stress and anxiety, which frequently resulted in serious health problem . Finally, the women reported that child protection involvement, most notably, the apprehension of their children, had a damaging impact on their children. To conclude the study, I offer an alternative representation that takes a narrower view of children' s exposure as well a a gendered view of intimate partner violence. It is hoped that this alternative representation offer a more useful way of understanding children's exposure to intimate partner woman abuse without punishing women for the behaviours of violent men.
Distributed Multiple Access Protocols and Real-Time Communication
Creators: name: Kurose, James F.
name: Yemini, Yechiam
name: Schwartz, Mischa
Publisher: name: Columbia University
Year: 1983
Subjects: Computer science

description: In the past 10 years the field of distributed multiple access communication has developed into a major area of both practical and theoretical interest within the field of computer communications. The multiple access problem arises from the necessity of sharing a single communication channel among a community of distributed users. The distributed algorithm used by the stations to share the channel is known as the multiple access protocol. This paper examines the multiple access problem and various approaches towards its resolution. This survey first defines the multiple access problem and then presents the underlying issues and difficulties in multiple access communication. A taxonomy for multiple access protocols is then developed in order to characterize common approaches and to provide a framework in which these protocols can be compared and contrasted. Different proposed protocols are then described and discussed and aspects of their performance are examined The use of multiple access protocols for "real-time" or "time-constrained" communication applications, such as voice transmission, is examined next. Issues in real-time communication are identified and recent work in the design of real-time multiple access protocols is surveyed.
On Calculation of Thermal Conductivity from Einstein Relation in Equilibrium MD
Creators: name: Kinaci, Alper
name: Haskins, Justin B.
name: Çağın, Tahir
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In equilibrium molecular dynamics, Einstein relation can be used to calculate the thermal conductivity. This method is equivalent to Green-Kubo relation and it does not require a derivation of an analytical form for the heat current. However, it is not commonly used as Green-Kubo relationship. Its wide use is hindered by the lack of a proper definition for integrated heat current (energy moment) under periodic boundary conditions. In this paper, we developed an appropriate definition for integrated heat current to calculate thermal conductivity of solids under periodic conditions. We applied this method to solid argon and silicon based systems; compared and contrasted with the Green-Kubo approach.
description: We updated this manuscript from second version by changing the title and abstract. This paper is submitted to J. Chem. Phys
Moduli space of sheaves on fans
Creators: name: Hakimi, Koopa
Publisher: name: University of British Columbia
Year: 2011

description: A conjecture of H. Hopf states that if x(M²n) is a closed, Riemannian manifold of nonpositive sectional curvature, then its Euler characteristic x(M²n), should satify (-1)n x(M²n)≥ 0. Ruth Charney and Michael Davis investigated the conjecture in the context of piecewise Euclidean manifolds having "nonpositive curvature" in the sense of Gromov's CAT(0) inequality. In that context the conjecture can be reduced to a local version which predicts the sign of a "local Euler characteristic" at each vertex. They stated precisely various conjectures in their paper which we are interested in one of them stated as Conjecture D (see [1]) which is equivalent to the Hopf Conjecture for piecewise Euclidean manifolds cellulated by cubes. The goal of this thesis is to study the Charney - Davis Conjecture stated as Conjecture (D) by using sheaves on fans.
Modelling Archaeological potential with GIS in Northern British Columbia
Creators: name: Harris, C. Jason
Publisher: name: University of Calgary
Year: 2009

description: Bibliography: p. 204-241
description: some pages are in colour
description: The use of site location models, whether internal intuitive or external formalized, is inherent in archaeological site prospection, discovery and management. The widespread use of Geographic Information Systems (GIS) for building archaeological site location models in the context of Cultural Resource Management (CRM) has reignited criticism and debate regarding their appropriate construction and use. This thesis demonstrates a correlative approach to modelling archaeological site location that is clear to follow, based on robust spatial statistics (Weights of Evidence) and is independently tested for performance. This thesis is important to the modelling endeavour in the Canadian boreal forest in that it can legitimately make these three claims. Additionally, the recognized importance of trails to archaeological site location is examined through an example of how least-cost paths may be used to fill-in for missing traditional trails data in the modelling endeavour. The model created in this thesis was successful with an overall performance of 90% of known sites in 41 % of the study area, modelled as moderate and high potential. The high potential areas scored a very high Kvamme Gain Statistic of 0.85. Also, the least­cost paths demonstration led to the consideration of an evidence category not previously entertained in Canadian boreal forest modelling programs; that of lakes containing aquatic resources.
Efficient Algorithms for the Design of Asynchronous Control Circuits
Creators: name: Theobald, Michael
Publisher: name: Columbia University
Year: 2004
Subjects: Computer science

description: Asynchronous (or "clock-less") digital circuit design has received much attention over the past few years, including its introduction into consumer products. One major bottleneck to the further advancement of clock-less design is the lack of optimizing CAD (computer-aided design) algorithms and tools. In synchronous design, CAD packages have been crucial to the advancement of the microelectronics industry. In fact, automated methods seem to be even more crucial for asynchronous design, which is widely considered as being much more error-prone. This thesis proposes several new efficient CAD techniques for the design of asynchronous control circuits. The contributions include: (i) two new and very efficient algorithms for hazard-free two-level logic minimization, including a heuristic algorithm, ESPRESSO-HF, and an exact algorithm based on implicit data structures, IMPYMIN; and (ii) a new synthesis and optimization method for large-scale asynchronous systems, which starts from a Control-Dataflow Graph (CDFG), and produces highly-optimized distributed control. As a case study, this latter method is applied to a differential equation solver; the resulting synthesized circuit is comparable in quality to a highly-optimized manual design.