cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Practical Challenges of Interference Alignment
Creators: name: Ayach, Omar El
name: Peters, Steven W.
name: Heath, Robert W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Interference alignment (IA) is a revolutionary wireless transmission strategy that reduces the impact of interference. The idea of interference alignment is to coordinate multiple transmitters so that their mutual interference aligns at the receivers, facilitating simple interference cancellation techniques. Since IA's inception, researchers have investigated its performance and proposed improvements, verifying IA's ability to achieve the maximum degrees of freedom (an approximation of sum capacity) in a variety of settings, developing algorithms for determining alignment solutions, and generalizing transmission strategies that relax the need for perfect alignment but yield better performance. This article provides an overview of the concept of interference alignment as well as an assessment of practical issues including performance in realistic propagation environments, the role of channel state information at the transmitter, and the practicality of interference alignment in large networks.
description: submitted to IEEE Wireless Communications Magazine
Zur Deutung der dreifachen Geschwindigkeitskorrelationen der isotropen Turbulenz
Creators: name: Hasselmann, Klaus
Publisher: name: TUHH Universitätsbibliothek
Year: 1958
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Zur Deutung der dreifachen Geschwindigkeitskorrelationen der isotropen Turbulenz
Minimal Holographic Superconductors from Maximal Supergravity
Creators: name: Bobev, Nikolay
name: Kundu, Arnab
name: Pilch, Krzysztof
name: Warner, Nicholas P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a truncation of four-dimensional maximal gauged supergravity that provides a realization of the minimal model of a holographic superconductor. We find various flow solutions in this truncation at zero and finite temperature with a non-trivial profile for the charged scalar. Below a critical temperature we find holographic superconductor solutions that represent the thermodynamically preferred phase. Depending on the choice of boundary conditions, the superconducting phase transition is either first or second order. For vanishing temperature we find a flow with a condensing charged scalar that interpolates between two perturbatively stable AdS_4 vacua and is the zero-temperature ground state of the holographic superconductor.
description: 25 pages, 9 figures
Analysis of adolescent group experience: a study of some former C.G.I.T. members
Creators: name: McGuckin, Helen M.
Publisher: name: University of Calgary
Year: 1971
Subjects: subject: HS 3365 C2 M18 1971
subject: Canadian Girls in Training
subject: Social groups
subject: Church work with adolescents
subject: Adolescent psychology

description: Bibliography: p. 57-58.
Quantum computing in a piece of glass
Creators: name: Miller, Warner A.
name: Kreymerman, Grigoriy
name: Tison, Christopher
name: Alsing, Paul M.
name: McDonald, Jonathan R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum gates and simple quantum algorithms can be designed utilizing the diffraction phenomena of a photon within a multiplexed holographic element. The quantum eigenstates we use are the photon's linear momentum (LM) as measured by the number of waves of tilt across the aperture. Two properties of quantum computing within the circuit model make this approach attractive. First, any conditional measurement can be commuted in time with any unitary quantum gate - the timeless nature of quantum computing. Second, photon entanglement can be encoded as a superposition state of a single photon in a higher-dimensional state space afforded by LM. Our theoretical and numerical results indicate that OptiGrate's photo-thermal refractive (PTR) glass is an enabling technology. We will review our previous design of a quantum projection operator and give credence to this approach on a representative quantum gate grounded on coupled-mode theory and numerical simulations, all with parameters consistent with PTR glass. We discuss the strengths (high efficiencies, robustness to environment) and limitations (scalability, crosstalk) of this technology. While not scalable, the utility and robustness of such optical elements for broader quantum information processing applications can be substantial.
description: 14 pages, 6 figures
Redefining Computing: Rise of ARM from consumer to Cloud for energy efficiency
Creators: name: Rahman, Tahmid Noor
name: Khan, Nusaiba
name: Zaman, Zarif Ishmam
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: Today, our lifestyle revolves around digital devices powered by microprocessors of different instruction set architectures (ISA). Among them, the most common are x86 and ARM, the brainpower of our computers and smartphones. Reduced instruction set computing (RISC) is the basis of ARM architecture, designed to offer greater energy efficiency. On the other hand, principles of complex instruction set computing (CISC) are utilized by x86 processors, which handle heavier computing tasks while being more power-hungry. The rise of smartphones over a decade has changed the laptop market. It also influenced customers towards ARM-based energy-efficient laptops. This transition in the computing segment is seen not only in consumers but also in commercial settings, especially data centers. Usually, data centers are designed to operate 24/7, where energy is a big concern. So, ARM chips have started making their way to cloud servers. This paper comprehensively analyzes and compares the ARM and x86 architectures to unravel the factors contributing to ARM's increasing dominance in the market. It also explores the impact of smartphones on the laptop market and assesses the significance of system-on-a-chip (SoC). Focusing on the proper utilization of energy and sustainability, our paper offers valuable insights into the growing trend of adopting ARM processors in the computing industry.
description: 19 pages, 13 figures
Interior Static Stellar Model with Electric Charge as an Oscillator
Creators: name: Baranov, A. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A model approach to the description of static stars filled with a charged Pascal perfect fluid within the framework of general relativity is investigated. The metric is written in Bondi's radiation coordinates. The gravitational equations are reduced to a nonlinear oscillator equation after transfomation to a new variable as a function of the radial coordinate. It is shown that in this case exact solutions of the Einstein-Maxwell equations for a concrete energy density distribution law of the charged fluid may be obtained as solution of the harmonic oscillator equation.
description: 2 pages, Talk presented at the 5th Int. Conf. on Grav. and Astrophys. of Acian-Pacific Countries (ICGA-5), Moscow, 2001
Snake states and Klein tunneling in a graphene Hall bar with a pn-junction
Creators: name: Barbiër, Michael
name: Papp, György
name: Peeters, François M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The Hall (RH) and bend (RB) resistance of a graphene Hall bar structure containing a pn-junction are calculated when in the ballistic regime. The simulations are done using the billiard model. Introducing a pn-junction--dividing the Hall bar geometry in two regions--leads to two distinct regimes exhibiting very different physics: 1) both regions are of n-type and 2) one region is n-type and the other p-type. In regime (1) a 'Hall plateau'--an enhancement of the resistance--appears for RH. On the other hand, in regime (2), we found a negative RH, which approaches zero for large B. The bend resistance is highly asymmetric in regime (2) and the resistance increases with increasing magnetic field B in one direction while it reduces to zero in the other direction.
description: 4 pages, 3 figures
On the Role of Electric Charge and Cosmological Constant in Structure Scalars
Creators: name: Herrera, L.
name: Di Prisco, A.
name: Ibañez, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The physical meaning of structure scalars is analyzed for charged dissipative spherical fluids and for neutral dust in the presence of cosmological constant. The role played by such factors in the structure scalars is clearly brought out and physical consequences are discussed. Particular attention needs to be paid to the changes introduced by the above mentioned factors in the inhomogeneity factor and the evolution of the expansion scalar and the shear tensor.
description: 5 pages Latex. Published in Phys. Rev. D. Some typos corrected
Planet-Induced Emission Enhancements in HD 179949: Results from McDonald Observations
Creators: name: Gurdemir, L.
name: Redfield, S.
name: Cuntz, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We monitored the Ca II H and K lines of HD 179949, a notable star in the southern hemisphere, to observe and confirm previously identified planet induced emission (PIE) as an effect of star-planet interaction. We obtained high resolution spectra (R ~ 53,000) with a signal-to-noise ratio S/N >~ 50 in the Ca II H and K cores during 10 nights of observation at the McDonald Observatory. Wide band echelle spectra were taken using the 2.7 m telescope. Detailed statistical analysis of Ca II K revealed fluctuations in the Ca II K core attributable to planet induced chromospheric emission. This result is consistent with previous studies by Shkolnik et al. (2003). Additionally, we were able to confirm the reality and temporal evolution of the phase shift of the maximum of star-planet interaction previously found. However, no identifiable fluctuations were detected in the Ca II H core. The Al I lambda 3944 A line was also monitored to gauge if the expected activity enhancements are confined to the chromospheric layer. Our observations revealed some variability, which is apparently unassociated with planet induced activity.
description: 11 pages, 11 figures, 5 tables; Publications of the Astronomical Society of Australia (in press)
Quantized Adiabatic Transport in Momentum Space
Creators: name: Ho, Derek Y. H.
name: Gong, Jiangbin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Though topological aspects of energy bands are known to play a key role in quantum transport in solid-state systems, the implications of Floquet band topology for transport in momentum space (i.e., acceleration) are not explored so far. Using a ratchet accelerator model inspired by existing cold-atom experiments, here we characterize a class of extended Floquet bands of one-dimensional driven quantum systems by Chern numbers, reveal topological phase transitions therein, and theoretically predict the quantization of adiabatic transport in momentum space. Numerical results confirm our theory and indicate the feasibility of experimental studies.
description: Main text of 11 pages plus Appendix of 13 pages. To appear in Phys. Rev. Lett
Green-Schwarz Mechanism in Heterotic (2,0) Gauged Linear Sigma Models: Torsion and NS5 Branes
Creators: name: Blaszczyk, Michael
name: Nibbelink, Stefan Groot
name: Ruehle, Fabian
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Heterotic string compactifications can be conveniently described in the language of (2,0) gauged linear sigma models (GLSMs). Such models allow for Fayet-Iliopoulos (FI)-terms, which can be interpreted as Kahler parameters and axions on the target space geometry. We show that field dependent non-gauge invariant FI-terms lead to a Green-Schwarz-like mechanism on the worldsheet which can be used to cancel worldsheet anomalies. However, given that these FI-terms are constrained by quantization conditions due to worldsheet gauge instantons, the anomaly conditions turn out to be still rather constraining. Field dependent non-gauge invariant FI-terms result in non-Kahler, i.e. torsional, target spaces in general. When FI-terms involve logarithmic terms, the GLSM seems to describe the heterotic string in the presence of Neveu-Schwarz (NS)5 branes. In particular, when the gauge bundle overcloses the Bianchi identities, the GLSM describes a decompactified target space geometry due to anti-NS5 branes.
description: 20 pages, sign corrected, orbifold discussion added, examples extended, references added
Brillouin Cooling
Creators: name: Tomes, Matthew
name: Marquardt, Florian
name: Bahl, Gaurav
name: Carmon, Tal
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We analyze how to exploit Brillouin scattering for the purpose of cooling opto-mechanical devices and present a quantum-mechanical theory for Brillouin cooling. Our analysis shows that significant cooling ratios can be obtained with standard experimental parameters. A further improvement of cooling efficiency is possible by increasing the dissipation of the optical anti-Stokes resonance.
description: 4 pages 3 figures
Interaction of a quantum well with squeezed light: Quantum-statistical properties
Creators: name: Sete, Eyob A.
name: Eleuch, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the quantum statistical properties of the light emitted by a quantum well interacting with squeezed light from a degenerate subthreshold optical parametric oscillator. We obtain analytical solutions for the pertinent quantum Langevin equations in the strong coupling and low excitation regimes. Using these solutions we calculate the intensity spectrum, autocorrelation function, quadrature squeezing for the fluorescent light. We show that the fluorescent light exhibits bunching and quadrature squeezing. We also show that the squeezed light leads to narrowing of the width of the spectrum of the fluorescent light.
description: 7 pages, 6 figures
SUV RESUSRLARIDAN FOYDALANISH QOIDALARINI HUQUQIY TAKOMILLASHTIRISH MASALALARI
Creators: name: Xurramov, E'zozbek
Publisher: name: Zenodo
Year: 2023

description: Maqola suv resurslaridan foydalanish qoidalarini huquqiy takomillashtirish, mavjud qonun hujjatlarini bugungi zamon talablariga moslashtirish bilan birga suvdan foydalanishning barcha turlarini huquqiy jihatdan tartibga solishning o'ziga xos jihatlarini yoritishga bag'ishlangan.
A study on regulatory policies in the international telephone markets : theory and empirical evidence
Creators: name: Ju, Heng
Publisher: name: University of British Columbia
Year: 2009

description: The provision of international telephone calls requires a settlement arrangement between countries in traffic exchanges. A call-termination charge, or "settlement rate", is paid from the call-initiating country to the terminating one. Around 1980, the U.S. government attempted to improve efficiency by unilaterally introducing competition into its domestic market, supplemented with rules on carriers designed to avoid an unfavorable position in settlement negotiations with other countries. In particular, the FCC required all U.S. carriers to act collectively when negotiating settlement rates with foreign carriers and apply a Proportional Return Rule (PRR) to share foreign settlement income in accordance with their market shares of outbound. The dissertation tries to evaluate the FCCs policies and identify the factors that can derive the market efficiency. Chapter 2 analyzes a scenario that competing carriers in a country jointly determine a uniform settlement rate for foreign incoming traffic. Under the PRR,, an increase in domestic competition reduces retail prices but also increases net settlement payments to other countries. Moreover, fixing the level of retail competition, the PRR cannot reduce retail prices, but increases the U.S.'s net settlement payments, contrary to the FCCs intent. Chapter 3 discusses two other scenarios. The first one is that carriers from two countries choose settlement rates in a cooperative fashion of Nash bargaining. The equilibrium settlement rate is lower than the one under non-cooperative regime. The second model, multiple routes relaxes the Uniformity requirement. When there are multiple routes to exchange traffic between two countries, or there is competition at the settlement services, the retail competition can steer the market outcomes toward the efficient level. Chapter 4 empirically examines the above theoretical predictions. I constructed a measurement of the intensity of the PRR for each international route in each year. I found empirical evidence that the rule did increase both the settlement rates and the net settlement payments made by the U.S. carriers. However, the rule's effect toward the retail price is unclear, possibly due to the model specification and the endogeneity issues. The empirical finding suggests that a multiple-route model matches the data better than the one with uniformity requirement.
Spatial dynamics of airborne infectious diseases
Creators: name: Robinson, M.
name: Stilianakis, N. I.
name: Drossinos, Y.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Disease outbreaks, such as those of Severe Acute Respiratory Syndrome in 2003 and the 2009 pandemic A(H1N1) influenza, have highlighted the potential for airborne transmission in indoor environments. Respirable pathogen-carrying droplets provide a vector for the spatial spread of infection with droplet transport determined by diffusive and convective processes. An epidemiological model describing the spatial dynamics of disease transmission is presented. The effects of an ambient airflow, as an infection control, are incorporated leading to a delay equation, with droplet density dependent on the infectious density at a previous time. It is found that small droplets ($\sim 0.4\ μ$m) generate a negligible infectious force due to the small viral load and the associated duration they require to transmit infection. In contrast, larger droplets ($\sim 4\ μ$m) can lead to an infectious wave propagating through a fully susceptible population or a secondary infection outbreak for a localised susceptible population. Droplet diffusion is found to be an inefficient mode of droplet transport leading to minimal spatial spread of infection. A threshold air velocity is derived, above which disease transmission is impaired even when the basic reproduction number $R_{0}$ exceeds unity.
description: 31 pages, 6 figures, to appear in the Journal of Theoretical Biology
DNC/HNC Ratio of Massive Clumps in Early Evolutionary Stages of High-Mass Star Formation
Creators: name: Sakai, Takeshi
name: Sakai, Nami
name: Furuya, Kenji
name: Aikawa, Yuri
name: Hirota, Tomoya
name: Yamamoto, Satoshi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have observed the HN13C J=1-0 and DNC J=1-0 lines toward 18 massive clumps, including infrared dark clouds (IRDCs) and high-mass protostellar objects (HMPOs), by using the Nobeyama Radio Observatory 45 m telescope. We have found that the HN13C emission is stronger than the DNC emission toward all the observed sources. The averaged DNC/HNC ratio is indeed lower toward the observed high-mass sources (0.009\pm0.005) than toward the low-mass starless and star-forming cores (0.06). The kinetic temperature derived from the NH3 (J, K) = (1, 1) and (2, 2) line intensities is higher toward the observed high-mass sources than toward the low-mass cores. However the DNC/HNC ratio of some IRDCs involving the Spitzer 24 μm sources is found to be lower than that of HMPOs, although the kinetic temperature of the IRDCs is lower than that of the HMPOs. This implies that the DNC/HNC ratio does not depend only on the current kinetic temperature. With the aid of chemical model simulations, we discuss how the DNC/HNC ratio decreases after the birth of protostars. We suggest that the DNC/HNC ratio in star-forming cores depends on the physical conditions and history in their starless-core phase, such as its duration time and the gas kinetic temperature.
description: 27 pages, 4 figures, accepted to ApJ
Characterization of innate immune responses to enteric bacterial pathogens in intestinal epithelial cells
Creators: name: Khan, Mohammed Aatif
Publisher: name: University of British Columbia
Year: 2009

description: Enteropathogenic Escherichia coli (EPEC) belongs to the attaching and effacing (A/E) family of bacterial pathogens, which infect intestinal enterocytes with type three secretion system (T3SS), leading to diarrheal disease. While A/E bacteria also express flagellin (FliC) which induces secretion of pro-inflammatory interleukin (IL)-8 from intestinal epithelial cells (IECs), it is unclear if flagellin is the sole trigger of epithelial responses. IECs express innate toll-like receptors (TLRs) to recognize flagellin and trigger inflammatory responses. Activation of TLRs is strictly controlled in IECs producing a state of hyporesponsiveness which prevents unwanted inflammation. The Single IgG IL-1 related receptor (Sigirr) is described as a negative regulator of IL-1β and TLR4 responses. While IECs express Sigirr, it is unknown if Sigirr inhibits innate responses to bacterial flagellin. The aims of this study were to characterize the role of flagellin in innate responses to EPEC infection and determine how Sigirr regulates these responses. Following infection of Caco-2 IECs by wild type and △fliC EPEC, activation of several proinflammatory genes including IL-8, MCP-1 and MIP3α occurred in a FliC-dependent manner. At later time points, a subset of these pro-inflammatory genes (IL-8, MlP3α) was also induced in cells infected with △fliC EPEC. The mouse adapted A/E pathogen Citrobacter Rodentium, triggered a similar innate response through a TLR5-independent but partially NF-kB-dependent mechanism. Moreover, the EPEC F1iC-independent responses increased in the absence of T3SS, suggesting that translocated bacterial effectors attenuated these response. While exploring regulatory mechanisms, we found that exposure of non-transformed TECs to bacterial flagellin transiently downregulated Sigirr expression correlating with IL-8 response. Transient silencing of the Sigirr gene augmented IL-S responses to flagellin, whereas stable over-expression of Sigirr diminished the NF-kB mediated IL-8 response to TLR ligands and inflammatory cytokines. The expression of Sigirr increased as IECs differentiated in tissue culture. Similarly, Sigirr expression was prominent in differentiated cells on the apex while diminished at the base of intestinal crypts in human colonic tissues. Thus, we demonstrate that A/E pathogens trigger pro-inflammatory responses through both FliC-dependent and -independent pathways that are regulated by Sigirr in differentiated human IEC, with clinical implications for infectious and inflammatory bowel diseases.
Light-Front Dynamic Analysis of Bound States in Scalar Field Model
Creators: name: Ji, Chueng-Ryong
name: Tokunaga, Yukihisa
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The light-front dynamics (LFD) of the scalar field model theory is analyzed to solve the two-body bound-state problem. The light-front two-body bound-state equation is extended to the full LFD kernel including the ladder, cross-ladder, stretched-box, and particle-antiparticle creation/annihilation effects to study the contributions of higher Fock-states. The light-front two-body equation is also modified by the term corresponding to the self-energy corrections and counter-terms. Using the variational principle, we obtain the numerical result of the binding energy B versus the coupling constant α for various mass ratios of the constituent particles including the cases of non-zero exchange particle mass. We also discuss the correlation between the mass spectrum and the corresponding bound-state wavefunction.
description: 21 pages, 13 figures. Submitted to Physical Review C
A Late devonian reef tract on northeastern Banks Island, N.W.T.
Creators: name: Embry, Ashton F. (Ashton Fox)
Publisher: name: University of Calgary
Year: 1970
Subjects: subject: QE 665 E43 1970
subject: Geology, Stratigraphic - Devonian
subject: Geology - Northwest Territories - Banks Island

description: Bibliography: p. 116-118.
description: The exposed Upper Devonian succession on northeastern Banks Island, N.W.T. is 3700 feet thick and has been correlated with the Griper Bay Formation. It consists mainly of terrigenous elastic rocks which were deposited in a marine shelf to coastal complex environment. The source area was located to the west. The age of the exposed section ranges from the base of the Frasnian to the Middle Famennian. Devonian strata have been moderately deformed,and north-south trending folds and normal faults are present. Deformation occurred during the Mississippian,and the structures were reactivated in the Tertiary. A 200 foot carbonate unit occurs in the middle of the succession . It has been herein named the Mercy Bay Member and is of Middle Frasnian age. It contains many organic buildups and represents a Devonian reef tract. The reef tract was located on the western shelf of an exogeosyncline which extended along the margin of North America between the stable craton and a western tectonic highland. The main facies changes in the Mercy Bay Member occur in an east-west direction. The organic buildups in the eastern part of the study area, which is the seaward edge of the reef tract, are narrow, linear bioherms which trend north-south. They are encased in younger terrigenous elastic rocks. To the west, the organic buildups, which are biohermal in the lower part and biostromal in the upper part, are more numerous. The lower bioherms trend east-west, and the inter-biohermal strata, which consist of dark, fine -grained, argillaceous limestones, are penecontemporaneous. The organic buildups on the western edge of the outcrop area are larger and are biohermal. The shoreward edge of the reef tract is not exposed. The lower portion of all the organic buildups is composed of corals and tabular stromatoporoids which built biogenetic banks in the quiet and intermediate energy zones. These energy zones are postulated to have been below 30 feet of water depth. The upper portion is composed of massive stromatoporoids which built rigid reefs in the high energy zone (above 30 feet). Successive sea level rises allowed the reefs to grow upward. The cessation of reef growth was caused by a rise in sea level and an influx of terrigenous sediment. The Griper Bay Formation appears to be a potential producer of hydrocarbons. The main potential reservoirs are the high energy coastal complex sandstones and possibly the organic buildups of the Mercy Bay Member.
The Middle-upper Devonian clastic wedge of the Franklinian geosyncline
Creators: name: Embry, Ashton F. (Ashton Fox)
Publisher: name: University of Calgary
Year: 1976
Subjects: subject: QE 665 E433 1976 Microfiche
subject: Geology, Stratigraphic - Devonian
subject: Geology - Northwest Territories

description: Bibliography: p. 259-274.
description: Middle - Upper Devonian elastic strata in the Canadian Arctic Islands are present over an area of about 200,000 sq km (75,000 sq miles) and are up to 5000 m (16,000 1) thick. The strata comprise a elastic wedge which was deposited in the Franklinian geosyncline prior to Late Devonian - Early Mississippian deformation. The elastic wedge is divided into eleven formations, and six facies are recognized within the strata. The formations and their facies content are: Blackley (submarine fan); Cape de Bray (marine slope); Weatherall (deltaic-marine shelf); Bird Fiord (open marine shelf and deltaic-marine shelf); Strathcona Fiord (meandering stream); Hecla Bay (braided stream); Fram (meandering stream); Hell Gate {braided stream); Nordstrand Point (meandering stream); Beverley Inlet (meandering stream); and Parry Islands (braided stream, meandering stream and deltaic-marine shelf). Mineralogy, facies distributions, paleocurrent patterns and regional geology all indicate that the source areas of the elastic strata lay to the north and east, and included the Caledonian and Pearya Mountain systems and Precambrian Shield of Greenland. Chert and rock fragments characterize detritus from the Pearya Mountains whereas detritus from the Caledonian Mountains and Precambrian Shield is characterized by a high percentage of monocrystalline quartz. Compositional variations within the elastic wedge indicate that the Pearya Mountains progressively supplied a higher proportion of the detritus throughout wedge development. Paleolatitude estimations, lithologies, fossils and clay minerailogy imply that the elastic wedge was deposited under humid tropical climatic conditions. Lithologic variations in fluvial strata suggest that the climate fluctuated between savanna and very humid. Clastic deposition commenced in the extreme northeast in Eifelian time, and a coastal plain prograded south and west until it covered almost the entire Arctic Islands area by Middle Frasnian. During progradation, submarine fan and marine slope deposits infilled deep basins in the northwest. In Late Frasnian the entire area was uplifted and subjected to erosion. The area was transgressed in latest Frasnian, and a marine shelf was widespread by Early Famennian. In latest Devonian or Early Mississippian the elastic wedge was uplifted and folded to form a "foothills" belt encircling the southwestern termination of the Pearya Mountains. Sandstone units of delta front, beach and distributary channel origin within the Weatherall and Bird Fiord Fms are rated as having the highest potential for petroleum accumulations. The strata may have uranium potential but the meager data, presently available in this regard, are not encouraging.
Log-normal distribution for correlators in lattice QCD?
Creators: name: DeGrand, Thomas
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Many hadronic correlators used in spectroscopy calculations in lattice QCD simulations appear to show a log-normal distribution at intermediate time separations.
description: 17 pages, 13 figures
Design and analysis of active and passive decoupling capacitors for on-chip power supply noise management
Creators: name: Meng, Xiongfei
Publisher: name: University of British Columbia
Year: 2009

description: On-chip decoupling capacitors (decaps) in the form of MOS transistors are widely used to reduce power supply noise in both standard-cell blocks and white spaces between blocks. This research provides guidelines for layouts of decaps that properly tradeoff high-frequency response, electrostatic discharge (ESD) reliability and gate tunneling leakage for use within standard-cell blocks in ASIC designs in 90nm and 65nm CMOS technologies. A simple but effective metric is developed to determine the optimal decap layout based on the frequency response. Novel active designs are also presented. If an JR-drop violation (hot spot) is found after the physical design is completed, it is usually difficult to implement a quick fix to the problem. In this dissertation, the use of an active decap in white-space areas as a drop-in replacement for passive decaps is investigated to provide noise reduction for these “hot-spot” problems found late in the design process. A modified active decap design is proposed for ASIC applications operating up to 1GHz, and the use of latch-based comparators provides a better power-delay trade-off. Measurement results from a test chip show that the noise reduction using active decaps improves as operating frequency increases, and provides between 10%-20% noise reduction at 200MHz-1GHz over its passive counterpart. The concept of active decap is further extended to achieve lower supply noise. It is found that an active decap with a stack height of three (i.e., number of pieces switching) provides the best noise reduction if the supply noise level is between 7%-14%, but a stack height of two is best if the noise level is between 14%-16%. In addition, a novel charge-borrowing decap circuit is introduced which outperforms all forms of active decaps for a fixed area in terms of removing local hot spots.
Weak Qubit Measurement with a Nonlinear Cavity: Beyond Perturbation Theory
Creators: name: Laflamme, Catherine
name: Clerk, Aashish A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the use of a driven nonlinear cavity to make a weak continuous measurement of a dispersively-coupled qubit. We calculate the backaction dephasing rate and measurement rate beyond leading-order perturbation theory using a phase-space approach which accounts for cavity noise squeezing. Surprisingly, we find that increasing the coupling strength beyond the regime describable by leading-order perturbation theory (i.e. linear response) allows one to come significantly closer to the quantum limit on the measurement efficiency. We interpret this behaviour in terms of the non-Gaussian photon number fluctuations of the nonlinear cavity. Our results are relevant to recent experiments using superconducting microwave circuits to study quantum measurement.
description: 4+ pages, 2 figures
The Solar Neighborhood XXVII: Discovery of New Proper Motion Stars with mu > 0.18 "/yr in the Southern Sky with 16.5 > R_59F > 18.0
Creators: name: Boyd, Mark R.
name: Henry, Todd J.
name: Jao, Wei-Chun
name: Subasavage, John P.
name: Hambly, Nigel C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Here we present 1584 new southern proper motion systems with mu > 0.18 "/yr and 16.5 > R_59F > 18.0. This search complements the six previous SuperCOSMOS-RECONS (SCR) proper motion searches of the southern sky for stars within the same proper motion range, but with R_59F < 16.5. As in previous papers, we present distance estimates for these systems and find that three systems are estimated to be within 25 pc, including one, SCR 1546-5534, possibly within the RECONS 10 pc horizon at 6.7 pc, making it the second nearest discovery of the searches. We find 97 white dwarf candidates with distance estimates between 10 and 120 pc, as well as 557 cool subdwarf candidates. The subdwarfs found in this paper make up nearly half of the subdwarf systems reported from our SCR searches, and are significantly redder than those discovered thus far. The SCR searches have now found 155 red dwarfs estimated to be within 25 pc, including 10 within 10 pc. In addition, 143 white dwarf candidates and 1155 cool subdwarf candidates have been discovered. The 1584 systems reported here augment the sample of 4724 systems previously discovered in our SCR searches, and imply that additional systems fainter than R_59F = 18.0 are yet to be discovered.
description: 11 pages of text, seven figures
Governing risk, exercising caution : western medical knowledge, physical activity and pregnancy
Creators: name: Jette, Shannon
Publisher: name: University of British Columbia
Year: 2009

description: In contemporary Western society, the messages regarding exercise during pregnancy are conflicting and confusing. Long-standing cautions about the dangers of over-exertion intermingle with entreaties to engage in moderate physical activity in order to have a healthier baby with a reduced risk of developing various chronic diseases. These medical messages then co-mingle with advice from family and friends as well as with images of the fit, pregnant 'yummy mummy' circulating in popular culture. The purpose of this dissertation is to trace history, untangle meanings and demonstrate shifting 'truth' claims about the active pregnant body, also considering how the various messages in circulation might be experienced as simultaneously empowering and oppressive by their intended audience, the pregnant woman. With these goals in mind, I draw upon the Foucauldian tools of archaeological and genealogical analysis to examine how knowledge regarding exercise during pregnancy has been produced over the past century, and how the messages put forth by the medical profession (and circulating within consumer culture) have functioned to regulate the activities of pregnant women. I also enlist the analytical tool of 'governmentality' (Foucault, 2003; O'Malley, 2008) to examine the place of exercise during pregnancy within the larger governmental apparatus of Western society over the past century. This approach provides a key insight as to why the ideas and messages about physical activity and pregnancy are so confusing: since the late nineteenth century, exercise during pregnancy has been framed as both a problem and a solution to the larger biopolitical aims of governance, aims which themselves have changed from a concern with the collective strength of the nation-state to a (neo-liberal) concern with the cost of unhealthy bodies. By situating maternal exercise within the larger governmental complex and closely examining the 'rules of formation' that allow particular statements (at certain times) to be accepted as 'truth' or 'knowledge' as well as showing how these 'truths' turn into a form of practicing power, my project illustrates the contingency of ideas regarding maternal exercise and troubles taken-for-granted ways of thinking about the active, pregnant body.
Jets and Wide Angle Outflows in Cepheus E: New Evidence from Spitzer
Creators: name: Velusamy, T.
name: Langer, W. D.
name: Kumar, M. S. N.
name: Grave, J. M. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In some protostellar objects both wide angle outflows and collimated jets are seen, while in others only one is observed. Spitzer provides unprecedented sensitivity in the infrared to study both the jet and outflow features. Here, we use HiRes deconvolution to improve the visualization of spatial morphology by enhancing resolution (to sub-arcsecond levels in the IRAC bands) and removing the contaminating sidelobes from bright sources. We apply this approach to study the jet and outflow features in Cep E a young, energetic Class 0 protostar. In the reprocessed images we detect: (i) wide angle outflow seen in scattered light; (ii) morphological details on at least 29 jet driven bow shocks and jet heads or knots; (iii) three compact features in 24 micron continuum image as atomic/ionic line emission coincident with the jet heads; and, (iv) a flattened 35 arcsec size protostellar envelope seen against the interstellar background PAH emission as an absorption band across the protostar at 8 micron. By separating the protostellar photospheric scattered emission in the wide angle cavity from the jet emission we show that we can study directly the scattered light spectrum. We present the H2 emission line spectra, as observed in all IRAC bands, for 29 knots in the jets and bowshocks and use them in the IRAC color -- color space as a diagnostic of the thermal gas in the shocks driven by the jets. The data presented here will enable detailed modeling of the individual shocks retracing the history of the episodic jet activity and the associated accretion on to the protostar. The Spitzer data analysis presented here shows the richness of its archive as a resource to study the jet/outflow features in H2 and scattered light in a large homogeneous sample.
description: 23 pages, 10 figures
Open Universe Model: Description by Mathieu Functions
Creators: name: Baranov, A. M.
name: Baranov, D. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A model of the open Universe described by a conformally flat 4-metric is considered. The gravitational equations with a perfect Pascal fluid as a source are reduced to the nonlinear equation of oscillations. It is proposed to consider this equation as the Mathieu equation encompassing some cosmological models. It is shown that the behaviour of the Universe state function is in qualitative accordance with the Big Bang scenario.
description: 2 pages, Talk presented at the 5th Int. Conf. on Grav. and Astrophys. of Acian-Pacific Countries (ICGA-5), Moscow, 2001
Spitzer observations of Bow Shocks and Outflows in RCW 38
Creators: name: Winston, E.
name: Wolk, S. J.
name: Bourke, T. L.
name: Megeath, S. T.
name: Gutermuth, R.
name: Spitzbart, B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report Spitzer observations of five newly identified bow shocks in the massive star-forming region RCW 38. Four are visible at IRAC wavelengths, the fifth is visible only at 24 microns. Chandra X-ray emission indicates that winds from the central O5.5 binary, IRS~2, have caused an outflow to the NE and SW of the central subcluster. The southern lobe of hot ionised gas is detected in X-rays; shocked gas and heated dust from the shock-front are detected with Spitzer at 4.5 and 24 microns. The northern outflow may have initiated the present generation of star formation, based on the filamentary distribution of the protostars in the central subcluster. Further, the bow-shock driving star, YSO 129, is photo-evaporating a pillar of gas and dust. No point sources are identified within this pillar at near- to mid-IR wavelengths. We also report on IRAC 3.6 & 5.8 micron observations of the cluster DBS2003-124, NE of RCW 38, where 33 candidate YSOs are identified. One star associated with the cluster drives a parsec-scale jet. Two candidate HH objects associated with the jet are visible at IRAC and MIPS wavelengths. The jet extends over a distance of ~3 pc. Assuming a velocity of 100 km/s for the jet material gives an age of about 30,000 years, indicating that the star (and cluster) are likely to be very young, with a similar or possibly younger age than RCW 38, and that star formation is ongoing in the extended RCW 38 region.
description: 27 pages, 6 figures, accepted to ApJ
Multiple and inverse topplings in the Abelian Sandpile Model
Creators: name: Caracciolo, Sergio
name: Paoletti, Guglielmo
name: Sportiello, Andrea
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: Combinatorics (math.CO)
subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The Abelian Sandpile Model is a cellular automaton whose discrete dynamics reaches an out-of-equilibrium steady state resembling avalanches in piles of sand. The fundamental moves defining the dynamics are encoded by the toppling rules. The transition monoid corresponding to this dynamics in the set of stable configurations is abelian, a property which seems at the basis of our understanding of the model. By including also antitoppling rules, we introduce and investigate a larger monoid, which is not abelian anymore. We prove a number of algebraic properties of this monoid, and describe their practical implications on the emerging structures of the model.
description: 22 pages, proceedings of the SigmaPhi2011 Conference
Petrology, paleoecology and diagenesis of the Manitowaning Bioherm, Manitoulin Island, Ontario
Creators: name: Grawbarger, David J.
Publisher: name: University of Calgary
Year: 1977
Subjects: subject: Bioherms - Ontario - Manitoulin Island
subject: Petrology - Ontario - Manitoulin Island
subject: Paleoecology - Ontario - Manitoulin Island
subject: Geology, Stratigraphic - Silurian

description: Bibliography: p. 138-148.
Temperature of Electron Fluctuations in an Accelerated Vacuum
Creators: name: Labun, Lance
name: Rafelski, Johann
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The electron vacuum fluctuations measured by $\cond$ do not vanish in an externally applied electric field $\calE$. For an exactly constant field, that is for vacuum fluctuations in presence of a constant accelerating force, we show that $\cond$ has a Boson-like structure with spectral state density $\tanh^{-1}(E/m)$ and temperature $\TEH = e\calE/mπ= a_v/π$. Considering the vacuum fluctuations of `classical' gyromagnetic ratio $g=1$ particles we find Fermi-like structure with the same spectral state density at a smaller temperature $T_1=a_v/2π$ which corresponds to the Unruh temperature of an accelerated observer.
description: 6 pages, prepared for proceedings of First LeCosPA Symposium, February, 2012
Einfluß des Momentenausgleichs durch das Schiffsruder bei der Ermittlung des effektiven Zusatzwiderstandes durch den Wind
Creators: name: Wagner, Bernd
Publisher: name: TUHH Universitätsbibliothek
Year: 1973
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Einfluß des Momentausgleichs durch das Schiffsruder bei der Ermittlung des effektiven Zusatzwiderstandes durch den Wind
Commuting Time Evolutions in the Tropical Periodic Toda Lattice
Creators: name: Takagi, Taichiro
Publisher: name: arXiv
Year: 2012
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The tropical (ultradiscrete) periodic Toda lattice is a dynamical system derived from a time-discretized version of the periodic Toda lattice through a limiting procedure called tropicalization. We propose a new formulation for this dynamical system with a representation by two-colored strips. Based on this formulation, a family of its commuting time evolutions is constructed.
description: 16 pages
Electronic Highways in Bilayer Graphene
Creators: name: Qiao, Zhenhua
name: Jung, Jeil
name: Niu, Qian
name: MacDonald, Allan H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Bilayer graphene with an interlayer potential difference has an energy gap and, when the potential difference varies spatially, topologically protected one-dimensional states localized along the difference's zero-lines. When disorder is absent, electronic travel directions along zero-line trajectories are fixed by valley Hall properties. Using the Landauer-Büttiker formula and the non-equilibrium Green's function technique we demonstrate numerically that collisions between electrons traveling in opposite directions, due to either disorder or changes in path direction, are strongly suppressed. We find that extremely long mean free paths of the order of hundreds of microns can be expected in relatively clean samples. This finding suggests the possibility of designing low power nanoscale electronic devices in which transport paths are controlled by gates which alter the inter-layer potential landscape.
description: 8 pages, 5 figures