cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
HAPS Technology: The New Generation For Wireless Communication Systems
Creators: name: Assadeq Abolhaoshat Mansour Albendag
Publisher: name: figshare
Year: 2020
Subjects: subject: Aerospace Engineering
subject: FOS: Mechanical engineering
subject: 100508 Satellite Communications
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The demand to achieve higher data rates for wirelesscommunications has accelerated the efforts to design moreinnovative communication infrastructures. Terrestrial andsatellite systems are used to provide mobilecommunications services. Both technologies have manybenefits but they also have few limitations. Recently, aninnovative way of overcoming the limitations of both theterrestrial and satellite systems is to provide wirelesscommunications via High Altitude Platform Station(HAPS). It is based on quasi-stationary aerial platformsoperating in the stratosphere. HAPS can be balloon, mannedor unmanned aerial platforms located at 17 to 25 km abovethe ground. HAPS acts as base-stations or relay nodes,where subscribers can transceive the data directly with theplatform to be then switched to other subscribers within thesame coverage area, or through heterogeneous networks toreach any other specific destinations.Various nationwide applications
Photoevaporation of Minihalos during Cosmic Reionization: Primordial and Metal-Enriched Halos
Creators: name: Nakatani, Riouhei
name: Fialkov, Anastasia
name: Yoshida, Naoki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The density distribution of the inter-galactic medium is an uncertain but highly important issue in the study of cosmic reionization. It is expected that there are abundant gas clouds hosted by low-mass "minihalos" in the early universe, which act as photon sinks until photoevaporated by the emerging ultra-violet background (UVB) radiation. We perform a suite of radiation hydrodynamics simulations to study the photoevaporation of minihalos. Our simulations follow hydrodynamics, non-equilibrium chemistry, and the associated cooling processes in a self-consistent manner. We conduct a parametric study by considering a wide range of gas metallicity ($0\,Z_\odot \leq Z \leq 10^{-3}\,Z_\odot$), halo mass ($10^3 M_\odot \leq M \leq 10^8 M_\odot$), UVB intensity ($0.01 \leq J_{21} \leq 1$), and turn-on redshift of ionizing sources ($10\leq z_{\rm IN} \leq 20$). We show that small halos are evaporated in a few tens million years, whereas larger mass halos survive for ten times longer. We show that the gas mass evolution of a minihalo can be characterized by a scaling parameter that is given by a combination of the halo mass, background radiation intensity, and redshift. Efficient radiative cooling in metal-enriched halos induces fast condensation of the gas to form a dense, self-shielded core. The cold, dense core can become gravitationally unstable in halos with high metallicities. Early metal enrichment may allow star formation in minihalos during cosmic reionization.
Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit
Creators: name: Bergeret, F. S.
name: Yeyati, A. Levy
name: Martin-Rodero, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The inverse proximity effect, i.e. the induction of a magnetic moment in the superconductor in superconductor-ferromagnet (S/F) junctions is studied theoretically. We present a microscopic approach which combines a model Hamiltonian with elements of the well established quasiclassical theory. With its help we study systems with arbitrary degree of disorder, interface transparency and thickness of the layers. In the diffusive limit we recover the result of previous works: the direction of the induced magnetization $M$ is opposite to the one of the F layer. However, we show that in the ballistic case the sign of $M$ may be positive or negative depending on the quality of the interface and thickness of the layers. {We show that, regardless of its sign, the penetration length of the magnetic moment into the superconductor is of the order of the superconductor coherence length, which demonstrates that the effect has a superconducting origin.}
description: 10 pages; 7 figures. To be published in Phys. Rev. B
Spin observables in deuteron-proton radiative capture at intermediate energies
Creators: name: Mehmandoost-Khajeh-Dad, A. A.
name: Amir-Ahmadi, H. R.
name: Bacelar, J. C. S.
name: van~den~Berg, A. M.
name: Castelijns, R.
name: Deltuva, A.
name: van~Garderen, E. D.
name: Glöckle, W.
name: Golak, J.
name: Kalantar-Nayestanaki, N.
name: Kamada, H.
name: Kiš, M.
name: Koohi-Fayegh-Dehkordi, R.
name: Löhner, H.
name: Mahjour-Shafiei, M.
name: Mardanpur, H.
name: Messchendorp, J. G.
name: Nogga, A.
name: Sauer, P.
name: Shende, S. V.
name: Skibinski, R.
name: Witała, H.
name: Wörtche, H. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A radiative deuteron-proton capture experiment was carried out at KVI using polarized-deuteron beams at incident energies of 55, 66.5, and 90 MeV/nucleon. Vector and tensor-analyzing powers were obtained for a large angular range. The results are interpreted with the help of Faddeev calculations, which are based on modern two- and three-nucleon potentials. Our data are described well by the calculations, and disagree significantly with the observed tensor anomaly at RCNP.
description: 10 pages, 4 figures, submitted to PLB
Feasibility of Cross-Chain Payment with Success Guarantees
Creators: name: van Glabbeek, Rob
name: Gramoli, Vincent
name: Tholoniat, Pierre
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: C.2.4; D.2.4; F.1.1; F.1.2

description: We consider the problem of cross-chain payment whereby customers of different escrows---implemented by a bank or a blockchain smart contract---successfully transfer digital assets without trusting each other. Prior to this work, cross-chain payment problems did not require this success, or any form of progress. We demonstrate that it is possible to solve this problem when assuming synchrony, in the sense that each message is guaranteed to arrive within a known amount of time, but impossible to solve without assuming synchrony. Yet, we solve a weaker variant of this problem, where success is conditional on the patience of the participants, without assuming synchrony, and in the presence of Byzantine failures. We also discuss the relation with the recently defined cross-chain deals.
description: This is a summary of the work reported in arXiv:1912.04513
Cost of s-fold Decisions in Exact Maxwell-Boltzmann, Bose-Einstein and Fermi-Dirac Statistics
Creators: name: Niven, Robert K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The exact forms of the degenerate Maxwell-Boltzmann (MB), Bose-Einstein (BE) and Fermi-Dirac (FD) entropy functions, derived by Boltzmann's principle without the Stirling approximation (Niven, Physics Letters A, 342(4) (2005) 286), are further examined. Firstly, an apparent paradox in quantisation effects is resolved using the Laplace-Jaynes interpretation of probability. The energy cost of learning that a system, distributed over s equiprobable states, is in one such state (an s-fold decision) is then calculated for each statistic. The analysis confirms that the cost depends on one's knowledge of the number of entities N and (for BE and FD statistics) the degeneracy, extending the findings of Niven (2005).
description: 7 figures; 5 pages; REVTEX / TeXShop; paper from 2005 NEXT-Sigma-Phi
Dark matter physics in dark $SU(2)$ gauge symmetry with non-Abelian kinetic mixing
Creators: name: Ko, P.
name: Nomura, Takaaki
name: Okada, Hiroshi
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate a model of dark sector based on non-Abelian $SU(2)_D$ gauge symmetry. This dark gauge symmetry is broken into discrete $Z_2$ via vacuum expectation values of two real triplet scalars, and an $SU(2)_D$ doublet Dirac fermion becomes $Z_2-$odd particles whose lighter component makes stable dark matter candidate. The standard model and dark sector can be connected via the scalar mixing and the gauge kinetic mixing generated by higher dimensional operators. We then discuss relic density of dark matter and implications to collider physics in the model. The most unique signatures of this model at the LHC would be the dark scalar ($Φ_1^{(')}$) productions where it subsequently decays into : (1) a fermionic dark matter ($χ_l$) and a heavy dark fermion ($χ_h$) pair, $Φ_1^{(')} \to \bar χ_l χ_h(\bar χ_h χ_l) $, followed by $χ_h$ decays into $χ_l$ and non-Abelian dark gauge bosons ($X_i$'s) which decays into SM fermion pair $\bar f_{SM} f_{SM}$ resulting in the reaction $p p \rightarrow Φ_1^{(')} \rightarrow \bar χ_h χ_l (\bar χ_l χ_h) \to f_{SM} \bar f_{SM} χ_l \bar χ_l $, (2) a pair of $X_i$'s followed by $X_i$ decays into a DM pair or the SM fermions resulting in the reaction, $p p \rightarrow Φ_1^{(')} \rightarrow X_i X_i \rightarrow \bar χ_l χ_l f_{SM} \bar f_{SM}$ or even number of $f_{SM} \bar{f}_{SM}$ pairs.
description: 20 pages, 5 figures
Missionarische Verkündigung - die Verpflichtung der Kirche gegenüber den ihr Fernstehenden
Creators: name: Wedel, Theodor O.
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 2 Nr. 4 (1953): Ökumenische Rundschau, Band 2, Heft 4
Identification of the Best Location for High Altitude Platform Station
Creators: name: Assadeq Abolhaoshat Mansour Albendag
Publisher: name: figshare
Year: 2020
Subjects: subject: Aerospace Engineering
subject: FOS: Mechanical engineering
subject: 100508 Satellite Communications
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: One of the main key issues in the exploitation ofHAPS is the rain as the rain attenuation is most dominant atthe frequencies above 10 GHz. The effect of rainfall is moresevere in tropical regions, which are characterized by heavyrainfall intensity for long periods of the day. This paperprovides a method that used to identify the best location ofthe HAPS stratospheric segment in peninsular Malaysia.The study was done based on ten ground stations that sufferthe highest rainfall intensities on the ground. The bestlocations for the northern and the southern platform werefound to be at Sungai Lembing (4.11° N, 102.88° E), andTanjung Kling (2.23° N, 102.02° E) respectively. Themodified ITU-R model was the used to carry out this study.
Quasi-particle interaction in nuclear matter from chiral pion-nucleon dynamics
Creators: name: Kaiser, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Based on a recent chiral approach to nuclear matter we calculate the in-medium interaction of nucleons at the Fermi surface $|\vec p_{1,2}|=k_f$. The isotropic part of this quasi-particle interaction is characterized by four density dependent (dimensionful) Fermi-liquid parameters: $f_0(k_f), f_0'(k_f), g_0(k_f)$ and $g_0'(k_f)$. In the approximation to $1π$-exchange and iterated $1π$-exchange (which as such leads already to a good nuclear matter equation of state) we find a spin-isospin interaction strength of $g_0'(2m_π) = 1.14 $fm$^2$, compatible with existing empirical values. In the next step we include systematically the contributions from $2π$-exchange with virtual $Δ(1232) $-isobar excitation which have been found important for good single-particle properties and spin-stability of nuclear matter. Without any additional short distance terms the spin-dependent Fermi-liquid parameters $g_0(k_{f0})$ and $g'_0(k_{f0})$ come out far too large. Estimates of these short-distance parameters from realistic NN-potentials go in the right direction, but sizeable enhancement factors are still needed to reproduce the empirical values of $g_0(k_{f0})$ and $g_0'(k_{f0})$. This points towards the importance of higher order iterations subsumed in the induced interaction. We consider also the tensor part of the quasi-nucleon interaction at the Fermi surface. In comparison to the leading $1π$-exchange tensor interaction we find from the $2π$-exchange corrections almost a doubling of the isoscalar tensor strength $h_0(k_f)$, whereas the isovector tensor strength $h_0'(k_f)$ is much less affected. These features are not changed by the inclusion of the chiral $πNΔ$-dynamics.
description: 19 pages, 9 figures, to be published in Nuclear Physics A (2006)
Investigating the biological potential of galactic cosmic ray-induced radiation-driven chemical disequilibrium in the Martian subsurface environment
Creators: name: Atri, Dimitra
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: There is growing evidence suggesting the presence of aqueous environment on ancient Mars, raising the question of the possibility of life in such an environment. Subsequently, with the erosion of the Martian atmosphere resulting in drastic changes in its climate, surface water disappeared, shrinking habitable spaces on the planet, with only a limited amount of water remaining near the surface in form of brines and water-ice deposits. Life, if it ever existed, would have had to adapt to harsh modern conditions, which includes low temperatures and surface pressure, and high radiation dose. Presently, there is no evidence of any biological activity on the planet's surface, however, the subsurface environment, which is yet to be explored, is less harsh, has traces of water in form of water-ice and brines, and undergoes radiation-driven redox chemistry. I hypothesize that Galactic Cosmic Ray (GCR)-induced radiation-driven chemical disequilibrium can be used for metabolic energy by extant life, and host organisms using mechanisms seen in similar chemical and radiation environments on Earth. I propose a GCR-induced radiolytic zone, and discuss the prospects of finding such life with Rosalind Franklin rover of the ExoMars mission.
description: 13 pages, 2 figures
Spinning strings and integrable spin chains in the AdS/CFT correspondence
Creators: name: Plefka, Jan
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this introductory review we discuss dynamical tests of the AdS_5 x S^5 string/N=4 super Yang-Mills duality. After a brief introduction to AdS/CFT we argue that semiclassical string energies yield information on the quantum spectrum of the string in the limit of large angular momenta on the S^5. The energies of the folded and circular spinning string solutions rotating on a S^3 within the S^5 are derived, which yield all loop predictions for the dual gauge theory scaling dimensions. These follow from the eigenvalues of the dilatation operator of N=4 super Yang-Mills in a minimal SU(2) subsector and we display its reformulation in terms of a Heisenberg s=1/2 spin chain along with the coordinate Bethe ansatz for its explicit diagonalization. In order to make contact to the spinning string energies we then study the thermodynamic limit of the one-loop gauge theory Bethe equations and demonstrate the matching with the folded and closed string result at this loop order. Finally the known gauge theory results at higher-loop orders are reviewed and the associated long-range spin chain Bethe ansatz is introduced, leading to an asymptotic all-loop conjecture for the gauge theory Bethe equations. This uncovers discrepancies at the three-loop order between gauge theory scaling dimensions and string theory energies and the implications of this are discussed. Along the way we comment on further developments and generalizations of the subject and point to the relevant literature.
description: 40 pages, invited contribution to Living Reviews in Relativity. v2: improvements in the text and references added
"Fram" letter anker 24 juni 1893. Pendent til foregaaende. Jeg sad paa Kontraskjæret paa Akershus og tegned nærværende, da "Fram" fyred op til Nordpolsfærd og i største stilhed styred Kristianiafjorden ud.
Creators: name: Mathiesen, Henrik
Publisher: name: Unknown
Year: 1893
Subjects: Udefinert

description: Tegning.
Glauben und Kirchenverfassung - Unser Einssein in Christus und unsere Uneinigkeit als Kirchen
Creators: name: Skydsgaard, Kristen Ejner
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 2 Nr. 4 (1953): Ökumenische Rundschau, Band 2, Heft 4
Terahertz radiation by ultrafast spontaneous polarization modulation in multiferroic BiFeO$_3$ thin films
Creators: name: Takahashi, Kouhei
name: Kida, Noriaki
name: Tonouchi, Masayoshi
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Terahertz (THz) radiation has been observed from multiferroic BiFeO$_3$ thin films via ultrafast modulation of spontaneous polarization upon carrier excitation with illumination of femtosecond laser pulses. The radiated THz pulses from BiFeO$_3$ thin films were clarified to directly reflect the spontaneous polarization state, giving rise to a memory effect in a unique style and enabling THz radiation even at zero-bias electric field. On the basis of our findings, we demonstrate potential approaches to ferroelectric nonvolatile random access memory with nondestructive readability and ferroelectric domain imaging microscopy using THz radiation as a sensitive probe.
description: 4 pages, 4 figures, submitted to Physical Review Letters
STRATEGIES FOR CUSTOMER VALUE CREATION AND THEIR ROLE IN HOTEL PATRONAGE IN AKWA IBOM STATE
Creators: name: Ijeoma Chinyere, Okoro
name: Uchechukwu, Emmanuel Nwosu
Publisher: name: noland journal
Year: 2024
Subjects: Customer, Value, Patronage, Satisfaction, Quality

description: Creation of customer value and building profitable relationships entail understanding consumer needs and wants, deciding which target markets organization can serve best and develop a compelling value proposition by which organization can attract, keep and grow the business. The study was conducted to assess the effect of customers value creation on patronage of hotels in Akwa Ibom State. The study employed the population proportion approach to determine a sample size of 819 and used the multiple regression for data analysis. Findings revealed that customer satisfaction and quality of service have significant positive effects in hotel patronage in Akwa Ibom State. It was recommended that the management of hotels in Akwa Ibom State should promote good working environment to promote and enhance satisfaction of customers. The researchers concluded that value creation have significant positive effect on hotel patronage in Akwa Ibom State
Magnetotransport properties of the topological nodal-line semimetal CaCdSn
Creators: name: Laha, Antu
name: Mardanya, Sougata
name: Singh, Bahadur
name: Lin, Hsin
name: Bansil, Arun
name: Agarwal, Amit
name: Hossain, Z.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Topological nodal-line semimetals support protected band crossings which form nodal lines or nodal loops between the valence and conduction bands and exhibit novel transport phenomena. Here we address the topological state of the nodal-line semimetal candidate material, CaCdSn, and report magnetotransport properties of its single crystals grown by the self-flux method. Our first-principles calculations show that the electronic structure of CaCdSn harbors a single nodal loop around the $Γ$ point in the absence of spin-orbit coupling (SOC) effects. The nodal crossings in CaCdSn are found to lie above the Fermi level and yield a Fermi surface that consists of both electron and hole pockets. CaCdSn exhibits high mobility ($μ\approx 3.44\times 10^4$ cm$^2$V$^{-1}$s$^{-1}$) and displays a field-induced metal-semiconductor like crossover with a plateau in resistivity at low temperature. We observe an extremely large and quasilinear non-saturating transverse as well as longitudinal magnetoresistance (MR) at low temperatures ($\approx 7.44\times 10^3 \%$ and $\approx 1.71\times 10^3\%$, respectively, at 4K). We also briefly discuss possible reasons behind such a large quasilinear magnetoresistance and its connection with the nontrivial band structure of CaCdSn.
description: 7 pages, 5 figures, Accepted in PRB
CARBON DIOXIDE GEOLOGIC SEQUESTRATION – A SAFE AND ECONOMICALLY EMERGING TECHNOLOGY FOR SUSTAINABLE ENVIRONMENT
Creators: name: Farooq, Salman
Publisher: name: figshare
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: ABSTRACT: Fossil fuel is main source of energy and responsible for one third of the total carbon dioxide (CO2) emissions. Global energy demand has been raised significantly due to increase in population, rapid growth of economies, emerging technologies and industrial revolution. This increase shows no signs of slowing. Now, pressure has been raised on the developed nations to reduce the CO2 emissions because the consequences of global climate change are potentially severe. Atmospheric CO2 can be reduced by capturing emissions from power plants or chemical units and storing them into the underground rocks and aquifers. CO2 separation, appropriate site selection, transportation, secure storage and afterward monitoring are the core processes in sequestration technology. Economy is one of the biggest challenges for deploying this technology whereas captured CO2 can be utilized for Enhanced Oil Recovery (EOR), Enhanced Coal Bed Methane Recovery (ECBM) and Enhanced Gas Recovery (EGR) etc to overcome on this problem. Underground uncertainty related risk assessment and management can control the major considerations for CO2 sequestration technology.
Baryon distribution amplitude: Large-Nc factorization, spin-flavor symmetry and soft-pion theorem
Creators: name: Pobylitsa, P. V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The 1/N_c expansion for the baryon distribution amplitude is constructed in terms of a specially designed generating functional. At large N_c this functional shows exponential behavior. The exponential factor is universal for all low-lying baryons and baryon-meson scattering states. Simple factorization properties are established for the preexponential term. This factorization agrees with the large-N_c contracted SU(2N_f) spin-flavor symmetry. The consistency of the factorization with the soft-pion theorem for the baryon distribution amplitude is explicitly checked. A relation between the generating functionals for the distribution amplitudes of the nucleon and the Delta resonance is derived.
description: 28 pages
Chiral phase structure of QCD with many flavors
Creators: name: Gies, Holger
name: Jaeckel, Joerg
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate QCD with a large number of massless flavors with the aid of renormalization group flow equations. We determine the critical number of flavors separating the phases with and without chiral symmetry breaking in SU(Nc) gauge theory with many fermion flavors. Our analysis includes all possible fermionic interaction channels in the pointlike four-fermion limit. Constraints from gauge invariance are resolved explicitly and regulator-scheme dependencies are studied. Our findings confirm the existence of an Nf window where the system is asymptotically free in the ultraviolet, but remains massless and chirally invariant on all scales, approaching a conformal fixed point in the infrared. Our prediction for the critical number of flavors of the zero-temperature chiral phase transition in SU(3) is Nf^{cr}=10.0\pm 0.29(fermion)[+1.55;-0.63](gluon), with the errors arising from approximations in the fermionic and gluonic sectors, respectively.
description: 7 pages, 3 figures, updated discussion of the uncertainties in the gauge sector
Study of tau Decays to Four-Hadron Final States with Kaons
Creators: name: Arms, K.
name: Collaboration, CLEO
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The tau decays to four hadrons have been studied with the CLEO III detector at the Cornell Electron Storage Ring (CESR) using (7.56 +- 0.15) fb^{-1} of data collected near the Y(4S) resonance. We present the first statistically significant measurements of B(tau- -> K- pi+pi- pi0 nu, excluding K^0) = (7.4 +- 0.8 +- 1.1) x 10^{-4} and B(tau--> K- K+ pi- pi0 nu) = (5.5 +- 1.4 +- 1.2) x 10^{-5}, including the first observation of the decay, tau- -> K- omega nu, with branching fraction (4.1 +- 0.6 +- 0.7) x 10^{-4}. We also publish the first upper limit for B(tau- -> K- K+ K- pi0 nu) < 4.8 (6.1) x 10^{-6} at 90% (95%) confidence level (C.L.).
description: 9 pages postscript, also available from http://www.lns.cornell.edu/public/CLNS/2004/, submitted to PRL
Kinetics of the evaporative cooling of an atomic beam
Creators: name: Lahaye, Thierry
name: Guéry-Odelin, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We compare two distincts models of evaporative cooling of a magnetically guided atomic beam: a continuous one, consisting in approximating the atomic distribution function by a truncated equilibrium distribution, and a discrete-step one, in which the evaporation process is described in terms of successive steps consisting in a truncation of the distribution followed by rethermalization. Calculations are performed for the semi-linear potential relevant for experiments. We show that it is possible to map one model onto the other, allowing us to infer, for the discrete-step model, the rethermalization kinetics, which turns out to be strongly dependent upon the shape of the confining potential.
description: Submitted to Phys. Rev. A
Subcarrier-wise Backscatter Communications over Ambient OFDM for Low Power IoT
Creators: name: Nemati, Mahyar
name: Soltani, Morteza
name: Ding, Jie
name: Choi, Jinho
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Ambient backscatter communication (AmBC) over orthogonal-frequency-division-multiplexing (OFDM) signals has recently been proposed as an appealing technique for low power Internet-of-Things (IoT) applications. The special spectrum structure of OFDM signals provides a range of flexibility in terms of bit-error-rate (BER) performance, data rate, and power consumption. In this paper, we study subcarrier-wise backscatter communication over ambient OFDM signals. This new AmBC is to exploit the special spectrum structure of OFDM to transmit data over its squeezed orthogonal subcarriers. We propose a basis transmission scheme and its two modifications to support a higher data rate with superior BER performance compared to existing methods. The basis scheme can transmit one bit per subcarrier using on-off keying (OOK) modulation in the frequency domain. In the first modification, interleaved subcarrier block transmission model is employed to improve the BER performance of the system in frequency-selective channels. It results in a trade-off between the size of the blocks and data rate. Thus, in the second modification, interleaved index modulation (IM) is employed to mitigate the data rate decrementation of the former modification. It also stabilizes and controls the power of the signal to result in interference reduction for a legacy receiver. Analytical and numerical evaluations provide a proof to see the performance of the proposed method in terms of BER, data rate, and interference.
description: Under review for IEEE TVT 2020
109. The tidal tails of Palomar 5
Creators: name: Perryman, Michael
Publisher: name: Zenodo
Year: 2023

description: Palomar 5 is a faint globular cluster 20 kpc from the Sun. Its two tidal tails, evidence that the cluster is experiencing heavy mass loss, have been known since 2001. With the form of the tails being sensitive to the shape of the Galactic halo, and with longer tails being more constraining, Gaia is contributing to their understanding.
Knots on a positive template have a bounded number of prime factors
Creators: name: Sullivan, Michael C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Geometric Topology (math.GT)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37D45, 57M25

description: Templates are branched 2-manifolds with semi-flows used to model `chaotic' hyperbolic invariant sets of flows on 3-manifolds. Knotted orbits on a template correspond to those in the original flow. Birman and Williams conjectured that for any given template the number of prime factors of the knots realized would be bounded. We prove a special case when the template is positive; the general case is now known to be false.
description: Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-24.abs.html
Prediction of Uniaxial Compressive Strength (UCS) of Sakesar Limestone in Salt Range - Pakistan by Indirect Methods
Creators: name: Farooq, Salman
name: Akram, Main Sohail
Publisher: name: figshare
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: ABSTRACT—Intact rock specimens are routinely tested in the laboratory for uniaxial compressive strength (UCS) which is an important design parameter in rock engineering. However, laboratory measurement is always expensive and time consuming and is generally not available as part of the small projects. Alternatively, indirect tests are relied to estimate UCS of various rocks through developing simple correlations among the results of uniaxial compressive strength (UCS) and indirect tests on the same rock. In the present study, efforts were made to make such correlations for Sakesar Limestone of Central Salt Range. In the study cored rock specimens were tested for UCS tests, Point Load tests (PLT) and Schmidt Rebound Hammer Tests (SRHT). All the tests’ results were analysed using statistical techniques to find their interrelationships. The developed relations indicated strong correlations between UCS and Point Load Index (PLI), and UCS and Schmidt Rebound number (Rn).From these relations, UCS is predictable from PLT and SRHT with a reasonable precision.
PARTICIPATORY MANAGEMENT APPROACHES AND THEIR IMPACT ON HOTEL PERFORMANCE IN DELTA STATE
Creators: name: Ngozi Ifeyinwa, Eze
name: Oluchi Nneoma, Anya
Publisher: name: noland journal
Year: 2024
Subjects: Participatory Management, Consultative Management, customer patronage

description: The study examined the influence of participatory management on patronage in hotels in Asaba, Delta state. The specific objectives include to; to determine the influence of consultative management on patronage in selected hotel operations in Asaba, Delta State. To achieve the objectives of the study, survey design method was used. The researcher adopted primary source of data through the use of well-structured questionnaire. Data were analyzed using simple regression analysis. The findings revealed that (i) there is a significance relationship between consultative management and patronage in hotel operations in the study area,(ii) there is no positive association between quality circle and patronage in hotel operations in the study area, the study recommends that consultative management, quality circles are important participatory management practices and indeed affect patronage in hotel operations. The study also recommends that a framework that will successfully link patronage with joint decision making and attitude surveys should also be incorporated
Temperature profiles, plumes and spectra in the surface layer of convective boundary layers
Creators: name: McNaughton, Keith G.
name: Chowdhuri, Subharthi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We survey temperature patterns and heat transport in convective boundary layers (CBLs) from the perspective that these are emergent properties of far-from-equilibrium, complex dynamical systems. We introduce a two-temperature (2T) toy model to define the cross-sectional areas of plumes, and connect the scaling properties of temperature gradients, temperature variance and heat transport to this area. We examine temperature ($T$) probability density functions and $w$-$T$ joint probability density functions, $T$ spectra and $wT$ cospectra observed both within and above the surface friction layer. Here $w$ is vertical velocity. In our discussion of $T$ spectra and $wT$ cospectra we focus on the self-similarity property of the plumes and flux events above the SFL. We interpret the $z^{1/2}$ dependence of the mixed length scale for wavenumbers in the $T$ spectra as reflecting the cross-sectional areas of the plumes, and so with the $z^{-1/2}$ form of the temperature profile, where $z$ is observation height. We introduce new scaling results for $T$ spectra and $wT$ cospectra from within the surface friction layer (SFL), based on a data from the SLTEST experiment. We confirm earlier results showing that the scaling behaviours of $T$ spectra and $wT$ cospectra change for heights below $z/z_s<0.1$, where $z_s$ the height of the SFL, and come to display properties associated with random diffusion. We conclude by contrasting our interpretation of the role of buoyancy as a system-wide action in CBL flows with that of Richardson, whose ideas inform the current interpretation of the statistical fluid mechanics model of boundary-layer flows.
Jutulstua. Kopi efter "Urda", 3dje bind, 2et hefte. Dette hefte findes kun i nogle faa ekspl.blev ikke udgivet. Naturforskerne i Bergens Museum havde faaet fat i det og brugte det til indpakningspapir.
Creators: name: Mathiesen, Henrik
Publisher: name: Unknown
Year: 0
Subjects: Udefinert

description: Jutulstua i Rennebu.
description: Tegning. Fra Katalog over Haandtegninger: Jutulstua. .
Table S3: Compilation of Nb/Ta data. Subduction-related subcontinental lithospheric mantle metasomatism and crustal thickening: origin for superchondritic Nb/Ta in mafic dykes
Creators: name: Cui, Xiang
name: Wenbin Zhu
name: F. Jourdan
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Table S3: Compilation of Nb/Ta and Zr/Hf data from mafic and intermediate igneous rocks in the Jiangnan Orogen used for figure 5.
Table S2: Modelling parameters. Subduction-related subcontinental lithospheric mantle metasomatism and crustal thickening: origin for superchondritic Nb/Ta in mafic dykes
Creators: name: Cui, Xiang
name: Wenbin Zhu
name: F. Jourdan
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Table S2: Modelling parameters.
Supplementary figures. Subduction-related subcontinental lithospheric mantle metasomatism and crustal thickening: origin for superchondritic Nb/Ta in mafic dykes
Creators: name: Cui, Xiang
name: Wenbin Zhu
name: F. Jourdan
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Supplementary figures
M-Theory Inflation from Multi M5-Brane Dynamics
Creators: name: Becker, Katrin
name: Becker, Melanie
name: Krause, Axel
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive inflation from M-theory on S^1/Z_2 via the non-perturbative dynamics of N M5-branes. The open membrane instanton interactions between the M5-branes give rise to exponential potentials which are too steep for inflation individually but lead to inflation when combined together. The resulting type of inflation, known as assisted inflation, facilitates considerably the requirement of having all moduli, except the inflaton, stabilized at the beginning of inflation. During inflation the distances between the M5-branes, which correspond to the inflatons, grow until they reach the size of the S^1/Z_2 orbifold. At this stage the M5-branes will reheat the universe by dissolving into the boundaries through small instanton transitions. Further flux and non-perturbative contributions become important at this late stage, bringing inflation to an end and stabilizing the moduli. We find that with moderate values for N, one obtains both a sufficient amount of e-foldings and the right size for the spectral index.
description: 30 pages, 3 figures; v3: one comment and refs added
Diffuse Radio Sources in a Statistically Complete Sample of High Redshift Galaxy Clusters
Creators: name: Giovannini, G.
name: Cau, M.
name: Bonafede, A.
name: Ebeling, H.
name: Feretti, L.
name: Girardi, M.
name: Gitti, M.
name: Govoni, F.
name: Ignesti, A.
name: Murgia, M.
name: Taylor, G. B.
name: Vacca, V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Non-thermal properties of galaxy clusters have been studied with detailed and deep radio images in comparison with X-ray data. While much progress has been made, most of the studied clusters are at a relatively low redshift (z < 0.3). We here investigate the evolutionary properties of the non-thermal cluster emission using two statistically complete samples at z > 0.3. We obtained short JVLA observations at L-band of the statistically complete sample of very X-ray luminous clusters from the Massive Cluster Survey (MACS) presented by Ebeling et al. (2010), and redshift range 0.3 - 0.5. We add to this list the complete sample of the 12 most distant MACS clusters (z > 0.5) presented in Ebeling et al. (2007). Most clusters show evidence of emission in the radio regime. We present the radio properties of all clusters in our sample and show images of newly detected diffuse sources. A radio halo is detected in 19 clusters, and five clusters contain a relic source. Most of the brightest cluster galaxies (BCG) in relaxed clusters show radio emission with powers typical of FRII radio galaxies, and some are surrounded by a radio mini-halo. The high frequency of radio emission from the BCG in relaxed clusters suggests that BCG feedback mechanisms are in place already at z about 0.6. The properties of radio halos and the small number of detected relics suggest redshift evolution in the properties of diffuse sources. The radio power (and size) of radio halos could be related to the number of past merger events in the history of the system. In this scenario, the presence of a giant and high-power radio halo is indicative of an evolved system with a large number of past major mergers.
description: Accepted for publication by Astronomy & Astrophysics. 19 pages, 24 Figures
Geotechnical evaluation of rock cut slopes using basic Rock Mass Rating (RMRbasic), Slope Mass Rating (SMR) and Kinematic Analysis along Islamabad Muzaffarabad Dual Carriageway (IMDC), Pakistan
Creators: name: Farooq, Salman
name: Akram, Main Sohail
Publisher: name: figshare
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Present study focuses on the geotechnical evaluation of rock instability along Islamabad -Muzaffarabad Dual Carriageway (IMDC). Review of the recent literature helped devising the methodology and accordingly activities for field studies were planned. Field studies included identifications of instability prone sites, recording of slope geometry, undertaking discontinuity surveys to record characteristics of the discontinuity for onward slope/rock mass characterization and classification, and rock/soil sampling at the representative locations for each rock/ soil units. Some field testing on rock samples was also undertaken. The field data was empirically and kinematically analyzed for the appraisal of slope failures and quality of rock mass. As outcome of the kinematic analyses, 38% sections have potential for plane and wedge failures. The rock quality lies in fair category as the result of rock mass rating (RMR). The slopes are partially stable to completely unstable according to slope mass rating (SMR). In view of the stability assessment of the studied sites and prevailing failure mechanisms, appropriate remedial measures were proposed for short as well long-term stability comprising rock benching, scaling off of loose rock blocks on the slopes, widening and periodic cleaning of catchment ditches, rehabilitation of existing retaining walls, shotcreting and rock bolting.
Relativistic exchange interactions in CrX$_3$ (X=Cl, Br, I) monolayers
Creators: name: Kvashnin, Y. O.
name: Bergman, A.
name: Lichtenstein, A. I.
name: Katsnelson, M. I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It has been predicted theoretically and indirectly confirmed experimentally that single-layer CrX$_3$ (X=Cl, Br, I) might be the prototypes of topological magnetic insulators (TMI). In this work, by using first-principles calculations combined with atomistic spin dynamics we provide a complete picture of the magnetic interactions and magnetic excitations in CrX$_3$. The focus is here on the two most important aspects for the actual realization of TMI, namely the relativistic magnetic interactions and the finite-size (edge) effects. We compute the full interaction tensor, which includes both Kitaev and Dzyaloshinskii-Moriya terms, which are considered as the most likely mechanisms for stabilizing topological magnons. First, we instigate the properties of bulk CrI$_3$ and compare the simulated magnon spectrum with the experimental data [Phys. Rev. X 8, 041028 (2018)]. Our results suggest that a large size of topological gap, seen in experiment ($\approx$ 4 meV), can not be explained by considering pair-wise spin interactions only. We identify several possible reasons for this disagreement and suggest that a pronounced magneto-elastic coupling should be expected in this class of materials. The magnetic interactions in the monolayers of CrX$_3$ are also investigated. The strength of the anisotropic interactions is shown to scale with the position of halide atom in the Periodic Table, the heavier the element the larger is the anisotropy. Comparing the magnons for the bulk and single-layer CrI$_3$, we find that the size of the topological gap becomes smaller in the latter case. Finally, we investigate finite-size effects in monolayers and demonstrate that the anisotropic couplings between Cr atoms close to the edges are much stronger than those in ideal periodic structure. This should have impact on the dynamics of the magnon edge modes in this class of materials.
description: 11 pages, 9 figures
Provenance of Jurassic sedimentary rocks of Quesnellia : implications for paleogeography
Creators: name: Petersen, Nathan Todd
Publisher: name: University of British Columbia
Year: 2009

description: Jurassic sedimentary rocks of Quesnellia record the history of the Quesnellian magmatic arc and reflect increasing continental influence throughout the Jurassic history of the terrane. Three provenance methods, including standard petrographic point counts, geochemistry and Sm-Nd isotopes and detrital zircon geochronology, were found to be complementary in reflecting source area characteristics. Each method provided valuable information about the source areas of the Jurassic sedimentary rocks of Quesnellia. Lower Jurassic proximal and proximal basin sedimentary rocks show characteristics of derivation from an arc source area. Sandstones are immature, grain compositions are dominated by plagioclase grains and volcanic lithics, and quartz is rare. The rocks are characterized by their geochemically and isotopically primitive nature. Detrital zircon populations, based on a limited number of analyses, are homogeneous Late Triassic or Early Jurassic groups, reflecting local derivation from Quesnellian arc sources. Middle Jurassic proximal and proximal basin sedimentary rocks show a trend toward more evolved characteristics. This trend is reflected in a change to more stable grain populations, with enrichment of plagioclase over volcanic lithics, subtle increases in quartz content, and noticeable amounts of chert and sedimentary lithics. The change to more evolved characteristics is emphasized by the overall decrease in eNd values of the sedimentary rocks and is reflected by the presence of Proterozoic detrital zircon grains. This change is probably due to a combination of two factors: (1) the erosion and weathering of the Late Triassic-Early Jurassic arc source of Quesnellia, linking the terrane to the continent, and/or (2) the onset of continental contamination of the Middle Jurassic phase of the arc. Distal environments are characterized by more efficient mixing of sediment from the local arc sources and continental material. This latter source is relatively prominent, showing up in the evolved geochemistry and Sm-Nd isotopes of the sedimentary rocks. This indicates that Quesnellia was tied to the continent throughout the Jurassic but the ties are not evident when the sedimentary environment dictates a dilutional effect from proximal arc sources. Western Quesnellia is distinctly different from eastern Quesnellia in terms of basement characteristics, ammonite faunas, facies association and detrital zircon populations. These differences point to the possibility that the two parts of the terrane underwent unique histories and support models calling for northward displacement of Quesnellia as a whole or northward displacement of just the western part of Quesnellia.
Chiral dynamics of $Σ$-hyperons in the nuclear medium
Creators: name: Kaiser, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using SU(3) chiral perturbation theory we calculate the density-dependent complex mean field $U_Σ(k_f)+ i W_Σ(k_f)$ of a $Σ$-hyperon in isospin-symmetric nuclear matter. The leading long-range $ΣN $-interaction arises from one-kaon exchange and from two-pion exchange with a $Σ$- or a $Λ$-hyperon in the intermediate state. We find from the $ΣN\to ΛN$ conversion process at nuclear matter saturation density $ρ_0 = 0.16 $fm$^{-3}$ an imaginary single-particle potential of $W_Σ(k_{f0}) =-21.5$ MeV, in fair agreement with existing empirical determinations. The genuine long-range contributions from iterated (second order) one-pion exchange with an intermediate $Σ$- or $Λ$-hyperon sum up to a moderately repulsive real single-particle potential of $U_Σ(k_{f0})= 59$ MeV. Recently measured $(π^-,K^+$) inclusive spectra related to $Σ^-$-formation in heavy nuclei give evidence for a $Σ$-nucleus repulsion of similar size. Our results suggest that the net effect of the short-range $ΣN$-interaction on the $Σ$-nuclear mean field could be small.
description: 7 pages, 2 figures, published in: Phys. Rev. C 71, 068201 (2005)