cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
AI based Service Management for 6G Green Communications
Creators: name: Mao, Bomin
name: Tang, Fengxiao
name: Yuichi, Kawamoto
name: Kato, Nei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Green communications have always been a target for the information industry to alleviate energy overhead and reduce fossil fuel usage. In current 5G and future 6G era, there is no doubt that the volume of network infrastructure and the number of connected terminals will keep exponentially increasing, which results in the surging energy cost. It becomes growing important and urgent to drive the development of green communications. However, 6G will inevitably have increasingly stringent and diversified requirements for Quality of Service (QoS), security, flexibility, and even intelligence, all of which challenge the improvement of energy efficiency. Moreover, the dynamic energy harvesting process, which will be adopted widely in 6G, further complicates the power control and network management. To address these challenges and reduce human intervene, Artificial Intelligence (AI) has been widely recognized and acknowledged as the only solution. Academia and industry have conducted extensive research to alleviate energy demand, improve energy efficiency, and manage energy harvesting in various communication scenarios. In this paper, we present the main considerations for green communications and survey the related research on AI-based green communications. We focus on how AI techniques are adopted to manage the network and improve energy harvesting toward the green era. We analyze how state-of-the-art Machine Learning (ML) and Deep Learning (DL) techniques can cooperate with conventional AI methods and mathematical models to reduce the algorithm complexity and optimize the accuracy rate to accelerate the applications in 6G. Finally, we discuss the existing problems and envision the challenges for these emerging techniques in 6G.
description: 35 pages, 9 figures
Universal Window for Two Dimensional Critical Exponents
Creators: name: Taroni, Andrea
name: Bramwell, Steven T.
name: Holdsworth, Peter C. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Two dimensional condensed matter is realised in increasingly diverse forms that are accessible to experiment and of potential technological value. The properties of these systems are influenced by many length scales and reflect both generic physics and chemical detail. To unify their physical description is therefore a complex and important challenge. Here we investigate the distribution of experimentally estimated critical exponents, $β$, that characterize the evolution of the order parameter through the ordering transition. The distribution is found to be bimodal and bounded within a window $\sim 0.1 \le β\le 0.25$, facts that are only in partial agreement with the established theory of critical phenomena. In particular, the bounded nature of the distribution is impossible to reconcile with existing theory for one of the major universality classes of two dimensional behaviour - the XY model with four fold crystal field - which predicts a spectrum of non-universal exponents bounded only from below. Through a combination of numerical and renormalization group arguments we resolve the contradiction between theory and experiment and demonstrate how the "universal window" for critical exponents observed in experiment arises from a competition between marginal operators.
description: 26 pages, 5 figures and 6 tables. Uses longtable package
Evidence for a soft-phonon-mode-driven Peierls-type distortion in Sc$_3$CoC$_4$
Creators: name: Langmann, Jan
name: Haas, Christof
name: Wenger, Emmanuel
name: Schaniel, Dominik
name: Scherer, Wolfgang
name: Eickerling, Georg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We provide experimental and theoretical evidence for the realization of the Peierls-type structurally distorted state in the quasi-one-dimensional superconductor Sc$_3$CoC$_4$ by a phonon-softening mechanism. The transition from the high- to the final low-temperature phase below 80K proceeds via an extended intermediate temperature regime between 80K and 150K characterized by phonon-driven atom displacements. In support of the low-dimensional character of the title compound we find a highly anisotropic correlation-length of these dynamic distortions.
description: 9 pages, 7 figures and supporting information
YОSH BОLАLАR KIYIMLАRI АNDОZАLАRINI TАHLIL QILISH
Creators: name: Rаximоvа, Kаmоlа
Publisher: name: Zenodo
Year: 2024

description: Zаmоnаviy dunyоdа kiyimlаrgа qо’yilаdigаn tаlаblаr dоim yuqоri bо’lgаn, shu jumlаdаn kiyimni shаkllаntirishdа fundаmеntаl аhаmiyаti vа kо'p funktsiyаli shаkllаrgа ijоdiy yеchimlаrni izlаsh nuqtаi nаzаridаn dеyаrli chеksiz imkоniyаtlаrni bеrаdi. Kо'p funktsiyаli о'zgаrtirilishi mumkin bо'lgаn mаhsulоt - bu bоshqа nаrsаgа аylаnishigа yоki о'zini sеzilаrli dаrаjаdа о'zgаrtirishgа imkоn bеrаdigаn shаkl tuzilishigа еgа bо'lgаn nаrsа xususiyаtlаri. Bоlаlаr kiyimlаri uchun аndоzаlаr yаrаtishdа аnа shundаy о’zigа xоs uslublаrdаn fоydаlаnilgаn.
Evidence for a Supernova Associated with the X-ray Flash 020903
Creators: name: Bersier, D.
name: Fruchter, A. S.
name: Strolger, L. -G.
name: Gorosabel, J.
name: Levan, A.
name: Burud, I.
name: Rhoads, J. E.
name: Becker, A. C.
name: Cassan, A.
name: Chornock, R.
name: Covino, S.
name: de Jong, R. S.
name: Dominis, D.
name: Filippenko, A. V.
name: Hjorth, J.
name: Holmberg, J.
name: Malesani, D.
name: Mobasher, B.
name: Olsen, K. A. G.
name: Stefanon, M.
name: Cerón, J. M. Castro
name: Fynbo, J. P. U.
name: Holland, S. T.
name: Kouveliotou, C.
name: Pedersen, H.
name: Tanvir, N. R.
name: Woosley, S. E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present ground-based and Hubble Space Telescope optical observations of the X-ray flash (XRF) 020903, covering 300 days. The afterglow showed a very rapid rise in the first day, followed by a relatively slow decay in the next few days. There was a clear bump in the light curve after ~25 days, accompanied by a drastic change in the spectral energy distribution. The light curve and the spectral energy distribution are naturally interpreted as the emergence -- and subsequent decay -- of a supernova (SN), similar to SN 1998bw. At peak luminosity, the SN is estimated to be 0.8 +/- 0.1 mag fainter than SN1998bw. This argues in favor of the existence of a supernova associated with this X-ray flash. A spectrum obtained 35 days after the burst shows emission lines from the host galaxy. We use this spectrum to put an upper limit on the oxygen abundance of the host at [O/H] < -0.6 dex. We also discuss a possible trend between the softness of several bursts and the early behavior of the optical afterglow, in the sense that XRFs and X-ray rich GRBs seem to have a plateau phase or even a rising light curve. This can be naturally explained in models where XRFs are similar to GRBs but seen off the jet axis.
description: ApJ, in press. Paper with full resolution figures available at http://www-int.stsci.edu/~bersier/grb020903.pdf
Trapped Bose-Bose mixtures at finite temperature: a quantum Monte Carlo approach
Creators: name: Dželalija, K.
name: Cikojević, V.
name: Boronat, J.
name: Markić, L. Vranješ
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study thermal properties of a trapped Bose-Bose mixture in a dilute regime using quantum Monte Carlo methods. Our main aim is to investigate the dependence of the superfluid density and the condensate fraction on temperature, for the mixed and separated phases. To this end, we use the diffusion Monte Carlo method, in the zero-temperature limit, and the path-integral Monte Carlo method for finite temperatures. The results obtained are compared with solutions of the coupled Gross-Pitaevskii equations for the mixture at zero temperature. We notice the existence of an anisotropic superfluid density in some phase-separated mixtures. Our results also show that the temperature evolution of the superfluid density and condensate fraction is slightly different, showing noteworthy situations where the superfluid fraction is smaller than the condensate fraction.
description: accepted for publication in Phys. Rev. A
Isoperiodic deformations of the acoustic operator and periodic solutions of the Harry Dym equation
Creators: name: Zakharov, D. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the problem of describing the possible spectra of an acoustic operator with a periodic finite-gap density. We construct flows on the moduli space of algebraic Riemann surfaces that preserve the periods of the corresponding operator. By a suitable extension of the phase space, these equations can be written with quadratic irrationalities.
description: 15 pages
Quantum criticality in the cubic heavy-fermion system CeIn_{3-x}Sn_x
Creators: name: Kuechler, R.
name: Gegenwart, P.
name: Custers, J.
name: Stockert, O.
name: Caroca-Canales, N.
name: Geibel, C.
name: Sereni, J. G.
name: Steglich, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report a comprehensive study of CeIn$_{3-x}$Sn$_x$ $(0.55 \leq x \leq 0.8)$ single crystals close to the antiferromagnetic (AF) quantum critical point (QCP) at $x_c\approx 0.67$ by means of the low-temperature thermal expansion and Grüneisen parameter. This system represents the first example for a {\it cubic} heavy fermion (HF) in which $T_{\rm N}$ can be suppressed {\it continuously} down to T=0. A characteristic sign change of the Grüneisen parameter between the AF and paramagnetic state indicates the accumulation of entropy close to the QCP. The observed quantum critical behavior is compatible with the predictions of the itinerant theory for three-dimensional critical spinfluctuations. This has important implications for the role of the dimensionality in HF QCPs.
description: Physical Review Letters, to be published
Influence of grain sizes and composition on the contraction rates of planetary envelopes and on planetary migration
Creators: name: Bitsch, Bertram
name: Savvidou, Sofia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: A crucial phase during planetary growth is the migration when the planetary core has been assembled, but the planet did not open a deep gap yet. During this phase the planet is subject to fast type-I migration, which is mostly directed inwards, and the planet can lose a significant fraction of its semi-major axis. The duration of this phase is set by how long the planetary envelope needs to contract until it reaches a mass similar to the mass of the planetary core, which is when runaway gas accretion can set in and the planet can open a deeper gap in the disc, transitioning into the slower type-II migration. This envelope contraction phase depends crucially on the planetary mass and on the opacity inside the planetary envelope. Here we study how different opacity prescriptions influence the envelope contraction time and how this in turn influences how far the planet migrates through the disc. We find within our simulations that the size distribution of the grains as well as the chemical composition of the grains crucially influences how far the planet migrates before it can reach the runaway gas accretion phase. Grain size distributions with larger grain sizes result in less inward migration of the growing planet, due to faster gas accretion enabled by more efficient cooling. In addition, we find that planets forming in water poor environments can contract their envelope faster and thus migrate less, implying that gas giants forming in water poor environments might be located further away from their central star compared to gas giants forming in water rich environments. Future studies of planet formation that aim to investigate the chemical composition of formed gas giants need to take these effects self consistently into account.
description: Accepted by A&A, 11 pages
Η χρήση των ιστολογίων στην εκπαίδευση και η επίδρασή τους στο σχολικό κλίμα: μια έρευνα δράσης:
Creators: name: Μιτιντζή, Ευανθία Αναστασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: ιστολόγιο
σχολικό κλίμα
έρευνα δράσης
blog
school climate
action research

description: Η προσθήκη του ιστολογίου στον κατάλογο των διαθέσιμων για τον εκπαιδευτικό διαδικτυακών εργαλείων είναι πρόσφατη. Ειδικότερα στον ελληνικό χώρο, η χρήση του ιστολογίου στην εκπαίδευση είναι περισσότερο περιορισμένη χρονικά, αλλά και λιγότερο διαδεδομένη. Η διαπίστωση αυτή μας οδήγησε στην απόφαση να διενεργηθεί μια ερευνητική προσπάθεια με αντικείμενο τη συμβολή της χρήσης του ιστολογίου στη διαμόρφωση του σχολικού κλίματος. Καθώς το ενδιαφέρον για τη βελτίωση του σχολικού κλίματος εντάσσεται στην προσπάθεια του εκπαιδευτικού να βελτιωθεί και να αυτοεπιμορφωθεί, η έρευνά μας συνδέεται άμεσα με το θέμα της Εκπαίδευσης και της Επιμόρφωσης των εκπαιδευτικών. Η παρούσα εργασία διαιρείται σε δύο μέρη: θεωρητική και εμπειρική προσέγγιση. Στο πρώτο μέρος επιχειρείται η θεωρητική προσέγγιση των όρων «σχολικό κλίμα» και «ιστολόγιο», καθώς και της ερευνητικής μεθόδου της έρευνας δράσης από την άποψη της συμβολής της στην επαγγελματική ανάπτυξη και την επιμόρφωση των εκπαιδευτικών. Στο δεύτερο μέρος της εργασίας, αυτό της εμπειρικής προσέγγισης παρουσιάζεται η ερευνητική προσπάθεια που διενεργήθηκε με σκοπό τη διερεύνηση της ενδεχόμενης επίδρασης του ιστολογίου στο σχολικό κλίμα. Συγκεκριμένα, παρουσιάζονται το ερευνητικό ερώτημα, η ερευνητική μέθοδος, η μέθοδος συλλογής δεδομένων, η προέρευνα, καθώς και οι τρεις κύκλοι δράσης της κύριας έρευνας. Ακολουθούν οι διαπιστώσεις που προέκυψαν από την ερμηνεία των εξαγομένων της έρευνας.
description: The weblog (blog) has been recently added to the list of internet tools that are available for the teacher. Specifically for the Greek field, the use of blogs is more time-limited and less widespread. This finding led us to the decision for a research which examines the contribution of blog usage in the school climate formation. As the interest in school climate improvement is part of the efforts of a teacher to improve and to train himself, this research is directly connected to the issue of a teacher’s education and training. The present thesis consists of two parts: theoretical and empirical approach. The first part theoretically approaches the terms “school climate” and “blog”, while at the same time the research method of Action Research from the point of its contribution to a teacher professional development and training. The second part presents the research that was done aiming at the examination of possible influence of the blog usage on school climate. More specifically the research question, the research method, the data collecting method, the preparation of the research and the three action cycles of the research are presented. The research findings and their interpretation is to be found at the end.
Search for Invisible Decay of the $Υ(1S)$
Creators: name: The Belle Collaboration
name: Tajima, O.
name: Hayashii, H.
name: Hazumi, M.
name: Inami, K.
name: Iwasaki, Y.
name: Uehara, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report results of a search for the invisible decay of the Upsilon(1S) via the Upsilon(3S)->pi+pi-Upsilon(1S) transition using a data sample of 2.9 fb^{-1} at the Upsilon(3S) resonance. The data were collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No signal is found, and an upper limit for the branching fraction at the 90% confidence level is determined to be B(Upsilon(1S)->invisible) < 2.5x10^{-3}.
description: 6 pages, 4 figures
Action-based distribution function modelling for constraining the shape of the Galactic dark matter halo
Creators: name: Hattori, Kohei
name: Valluri, Monica
name: Vasiliev, Eugene
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We estimate the 3D density profile of the Galactic dark matter (DM) halo within $r \lesssim 30$ kpc from the Galactic centre by using the astrometric data for halo RR Lyrae stars from Gaia DR2. We model both the stellar halo distribution function and the Galactic potential, fully taking into account the survey selection function, the observational errors, and the missing line-of-sight velocity data for RR Lyrae stars. With a Bayesian MCMC method, we infer the model parameters, including the density flattening of the DM halo $q$, which is assumed to be constant as a function of radius. We find that 99\% of the posterior distribution of $q$ is located at $q>0.963$, which strongly disfavours a flattened DM halo. We cannot draw any conclusions as to whether the Galactic DM halo at $r \lesssim 30$ kpc is prolate, because we restrict ourselves to axisymmetric oblate halo models with $q\leq1$. Our result is inconsistent with predictions from cosmological hydrodynamical simulations that advocate more oblate ($\langle{q}\rangle \sim0.8 \pm 0.15$) DM halos within $\sim 15\%$ of the virial radius for Milky-Way-sized galaxies. An alternative possibility, based on our validation tests with a cosmological simulation, is that the true value $q$ of the Galactic halo could be consistent with cosmological simulations but that disequilibrium in the Milky Way potential is inflating our measurement of $q$ by 0.1-0.2. As a by-product of our analysis, our model constrains the DM density in the Solar neighbourhood to be $ρ_{\mathrm{DM},\odot} = (9.01^{+0.18}_{-0.20})\times10^{-3}M_\odot \mathrm{pc}^{-3} = 0.342^{+0.007}_{-0.007}$ $\;\mathrm{GeV} \mathrm{cm}^{-3}$.
description: MNRAS submitted. 15 pages (plus Appendix 7 pages). 6 figures (plus 10 figures in Appendix). Comments welcome
Confirmation of a Faraday Rotation Measure Anomaly in Cygnus
Creators: name: Whiting, Catherine A.
name: Spangler, Steven R.
name: Ingleby, Laura D.
name: Haffner, L. Matthew
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We confirm the reality of a reversal of the sign of the Faraday Rotation Measure in the Galactic plane in Cygnus (Lazio et al, 1990), possibly associated with the Cygnus OB1 association. The rotation measure changes by several hundred rad/m$^2$ over an angular scale of $2-5^{\circ}$. We show that a simple model of an expanding plasma shell with an enhanced density and magnetic field, consistent with observations of H$α$ emission in this part of sky, and physically associated with a superbubble of the Cygnus OB1 association, can account for the magnitude and angular scale of this feature.
description: Submitted to the Astrophysical Journal
Studies on optical signal due to oxygen effect on hydrogenated amorphous/crystalline silicon thin-films
Creators: name: Rana, Meenakshi
name: Banerjee, Chandan
name: Chowdhury, Papia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We have studied the effects of oxygen on hydrogenated amorphous/crystalline silicon films in terms of their structural and optical properties. Different hydrogenated silicon oxide (SiO:H) and silicon (Si:H) films are fabricated between microcrystalline and amorphous transition region. X-ray diffraction, Raman, FTIR and UV-Vis emission spectrometry have been used to characterize different films. A comparison of the results with those of different types of films like hydrogenated amorphous silicon oxide (a-SiO:H), hydrogenated amorphous silicon (a-Si:H) and microcrystalline silicon ($μ$c-Si:H) films reveal their superiority as an excellent substance for solar cell. X-ray diffraction, FTIR and Raman spectral analysis show that difference of the H dilution effect has a major effect on the structure of the film and the optical properties. Photoluminescence analysis of amorphous silicon-oxygen and silicon-hydride alloy films has established their efficient application appropriate as Si based light emitting devices. A large optical band gap of 1.83 eV and appearance of strong photo luminescence at 2.0 eV validates the applicability of a-SiO:H film as a better alternative for the solar cells.
description: Oxygen effect have been studied on hydrogenated amorphous/crystalline silicon thin-films for solar cell applications
Estimating Intermittency Exponent in Neutrally Stratified Atmospheric Surface Layer Flows: A Robust Framework based on Magnitude Cumulant and Surrogate Analyses
Creators: name: Basu, Sukanta
name: Foufoula-Georgiou, Efi
name: Lashermes, Bruno
name: Arneodo, Alain
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: This study proposes a novel framework based on magnitude cumulant and surrogate analyses to reliably detect and estimate the intermittency coefficient from short-length coarse-resolution turbulent time series. Intermittency coefficients estimated from a large number of neutrally stratified atmospheric surface layer turbulent series from various field campaigns are shown to remarkably concur with well-known laboratory experimental results. In addition, surrogate-based hypothesis testing significantly reduces the likelihood of detecting a spurious non-zero intermittency coefficient from non-intermittent series. The discriminatory power of the proposed framework is promising for addressing the unresolved question of how atmospheric stability affects the intermittency properties of boundary layer turbulence.
Measuring the Mass of a Pre-Main Sequence Binary Star Through the Orbit of TWA 5A
Creators: name: Konopacky, Q. M.
name: Ghez, A. M.
name: Duchene, G.
name: McCabe, C.
name: Macintosh, B. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a five year monitoring campaign of the close binary TWA 5Aab in the TW Hydrae association, using speckle and adaptive optics on the W.M. Keck 10 m telescopes. These measurements were taken as part of our ongoing monitoring of pre-main sequence (PMS) binaries in an effort to increase the number of dynamically determined PMS masses and thereby calibrate the theoretical PMS evolutionary tracks. Our observations have allowed us to obtain the first determination of this system's astrometric orbit. We find an orbital period of 5.94 +- 0.09 years and a semi-major axis of 0.066" +- 0.005". Combining these results with a kinematic distance, we calculate a total mass of 0.71 +- 0.14 M_sun (D/44 pc)^3. for this system. This mass measurement, as well as the estimated age of this system, are consistent to within 2$σ$ of all theoretical models considered. In this analysis, we properly account for correlated uncertainties, and show that while these correlations are generally ignored, they increase the formal uncertainties by up to a factor of five and therefore are important to incorporate. With only a few more years of observation, this type of measurement will allow the theoretical models to be distinguished.
description: 6 pages (emulateapj style), 4 figures. Accepted for publication in AJ
Universal superlattice potential for 2D materials from twisted interface inside h-BN substrate
Creators: name: Zhao, Pei
name: Xiao, Chengxin
name: Yao, Wang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Lateral superlattices in 2D materials are emerging as a powerful platform for exploring novel quantum phenomena, which can be realized through the proximity coupling in forming moiré pattern with another layer. This approach, however, is invasive, material-specific, and requires small lattice mismatch and suitable band alignment, largely limited to graphene and transition metal dichalcogenides (TMDs). Hexagonal boron nitride (h-BN) of anti-parallel (AA') stacking order has been an indispensable building block, as dielectric substrates and capping layers for realizing high quality van der Waals devices. There is also emerging interest on parallelly aligned h-BN of Bernal (AB) stacking, where the broken inversion and mirror symmetries lead to out-of-plane electrical polarization with sign controlled by interlayer translation. Here we show that the laterally patterned electrical polarization at a nearly parallel interface within the h-BN substrate or capping layer can be exploited to create non-invasively a universal superlattice potential in general 2D materials. The feasibility is demonstrated by first principle calculations for monolayer MoSe2, black phosphorus, and antiferromagnetic MnPSe3 on such h-BN substrate. The potential strength can reach 200 meV, customizable in this range through choice of vertical distance of target material from the interface in h-BN. We also find sizable out-of-plane electric field at the h-BN surface, which can realize superlattice potential for interlayer excitons in TMD bilayers as well as dipolar molecules. The idea is further generalized to AB stacked h-BN film subject to torsion with adjacent layers all twisted with an angle, which allows the potential and field strength to be scaled up with film thickness, saturating to a quasi-periodic one with chiral structure.
Optical and Electronic Properties of CdTe Quantum Dots in their Freezed Solid Matrix Phase and Solution Phase
Creators: name: Pooja
name: Chowdhury, Papia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The present work deals with the comparison of sizes, optical and electronic properties of COOH functionalized CdTe quantum dots (QDs) in freezed solid polymeric (polyvinyl alcohol (PVA) matrix and in solution phase (water). PVA has been chosen as host material for guest CdTe QDs because of its unique properties like hydrophilicity, good thermo stability, and easy process ability. Experimental absorption, emission, X-Ray diffraction spectra and electronic band gap have been studied by UV-Vis absorption, luminescence and X-Ray diffraction spectroscopy. The smaller size of CdTe QDs in solid PVA polymer matrix (~ 6 nm) and larger band gap of ~9.5 eV validates their quantum confinement regime in freezed solid phase. The smaller particle size in solid phase compared to that of the particle size in its solution phase (8 nm) validates the non existence of agglomeration in solid phase. Appearance of high intense and wide luminescence emission in solid form proves the strong candidature of CdTe QDs as promising sensors for today's optoelectronic and biomedical industry.
description: Opticla properties of CdTe QDs have been studied in Solid matrix phase for better application purpose
Stable gapless superconductivity at strong coupling
Creators: name: Kitazawa, Masakiyo
name: Rischke, Dirk H.
name: Shovkovy, Igor A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study cross-flavor Cooper pairing in a relativistic system of two fermion species with mismatched Fermi surfaces. We find that there exist gapless phases which are characterized by either one or two gapless nodes in the energy spectra of their quasiparticles. An analysis of the current-current correlator reveals that, at strong coupling, both of these gapless phases can be free of magnetic instabilities and thus are stable. This is in contrast to the weak-coupling case where there are always two gapless nodes and the phase becomes magnetically unstable.
description: 8 pages, 4 figures
Symmetry Transformation in Extended Phase Space: the Harmonic Oscillator in the Husimi Representation
Creators: name: Bahrami, Samira
name: Nasiri, Sadolah
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a previous work the concept of quantum potential is generalized into extended phase space (EPS) for a particle in linear and harmonic potentials. It was shown there that in contrast to the Schrödinger quantum mechanics by an appropriate extended canonical transformation one can obtain the Wigner representation of phase space quantum mechanics in which the quantum potential is removed from dynamical equation. In other words, one still has the form invariance of the ordinary Hamilton-Jacobi equation in this representation. The situation, mathematically, is similar to the disappearance of the centrifugal potential in going from the spherical to the Cartesian coordinates. Here we show that the Husimi representation is another possible representation where the quantum potential for the harmonic potential disappears and the modified Hamilton-Jacobi equation reduces to the familiar classical form. This happens when the parameter in the Husimi transformation assumes a specific value corresponding to $Q$-function.
description: This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Suffizienzansätze in der nationalen Energie- und Klimapolitik in Deutschland
Creators: name: Benjamin, Benjamin
Publisher: name: Zenodo
Year: 2022

description: Steigende Energiepreise und die Importabhängigkeit von fossilen Energieträgern – unter anderem aufgrund des Krieges in der Ukraine – erfordern eine politische und gesellschaftliche Reaktion. Wie kann es gelingen, weniger Energie zu verbrauchen? Hier kann die Energiesuffizienz als Nachhaltigkeitsstrategie Ansatzpunkte liefern. Dr. Benjamin Best, der am Wuppertal Institut für Klima, Umwelt, Energie forscht, geht der Frage nach, welche Pläne und Instrumente für Energiesuffizienz die politischen Institutionen in Deutschland vorlegen.Der Krieg in der Ukraine verändert die politischen Prämissen in rasender Geschwindigkeit. Fraglich ist, wie Politik und Gesellschaft auf hohe Energiepreise und eine fatale Importabhängigkeit von fossilen Energieträgern reagieren sollen. Ist ein Leben und Wirtschaften mit weniger Energiebedarf möglich? Energiesuffizienz kann bei der Beantwortung dieser Frage eine wichtige Rolle spielen.

Gefördert vom Bundesministerium für Bildung und Forschung (BMBF) im Rahmen des Projekts "EnSu - Energieversorgung in Energiewende und Gesellschaft" (https://energysufficiency.de/) im Rahmen der Strategie "Forschung für Nachhaltigkeit" (FONA) (http://www.fona.de/en) im Förderschwerpunkt Sozial-ökologische Forschung, Förderkennzeichen [01UU2004B]. Die Verantwortung für den Inhalt dieser Veröffentlichung liegt bei den Autor:innen.
Structure and water attachment rates of ice in the atmosphere: role of nitrogen
Creators: name: Llombart, Pablo
name: Bergua, Ramón M.
name: Noya, Eva G.
name: MacDowell, Luis G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Computational Physics (physics.comp-ph)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: In this work we perform computer simulations of the ice surface in order to elucidate the role of nitrogen in the crystal growth rates and crystal habits of snow in the atmosphere. In pure water vapor at temperatures typical of ice crystal formation in cirrus clouds, we find that basal and primary prismatic facets exhibit a layer of premelted ice, with thickness in the subnanometer range. For partial pressures of 1 bar, well above the expected values in the troposphere, we find that only small amounts of nitrogen are adsorbed. The adsorption takes place onto the premelted surface, and hardly any nitrogen dissolves within the premelting film. The premelting film thickness does not change either. We quantify the resulting change of the ice/vapor surface tension to be in the hundredth of mN/m and find that the structure of the pristine ice surface is not changed in a significant manner. We perform a trajectory analysis of colliding water molecules, and find that the attachment rates from direct ballistic collision are very close to unity irrespective of the nitrogen pressure. Nitrogen is however at sufficient density to deflect a fraction of trajectories with smaller distance than the mean free path. Our results show explicitly that the reported differences in growth rates measured in pure water vapor and a controlled nitrogen atmosphere are not related to a significant disruption of the ice surface due to nitrogen adsorption. On the contrary, we show clearly from our trajectory analysis that nitrogen slows down the crystal growth rates due to collisions between water molecules with bulk nitrogen gas. This clarifies the long standing controversy of the role of inert gases on crystal growth rates and demonstrates their influence is solely related to the diffusion limited flow of water vapor across the gas phase.
description: 43 pages, 13 figures, including supplementary
Comparative study of unscreened and screened molecular static linear polarizability in the Hartree-Fock, hybrid-density functional, and density functional models
Creators: name: Zope, Rajendra R.
name: Baruah, Tunna
name: Pederson, Mark R.
name: Dunlap, Brett I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The sum-over-states (SOS) polarizabilities are calculated within the approximate independent electron theories such as the Hartree-Fock approximation and density functional models using the eigenvalues and orbitals obtained from the self-consistent solution of single-particle equations. The SOS polarizabilities are then compared with those calculated using the finite-field method within three widely used single particle models: (1) the Hartree-Fock (HF) method, (2) the three parameter hybrid generalized gradient approximation (B3LYP), and (3) the parameter free generalized gradient approximation due to Perdew-Burke-Ernzerhof (PBE). The comparison is carried out for polarizabilities of 142 molecules calculated using the 6-311++G(d,p) orbital basis at the geometries optimized at the B3LYP/6-311G** level. The results show that the SOS method almost always overestimate the FF polarizabilities in the PBE and B3LYP models. This trend is reversed in the HF method however exception to the trend do exist. The mean absolute errors (MAE) in the screened (FF) and unscreened (SOS) polarizability are 0.78 Å$^3$ for the HF method, 1.87 Å$^3$ for the B3LYP, and 3.44 Å$^3$ for the PBE-GGA. The Hartree-Fock approximation predicts finite-field polarizabilities that are smaller than those predicted by the PBE and B3LYP models. Finally, a simple scheme is devised to obtain FF quality estimate of polarizability from those obtained using the SOS method by exploiting the observed trends.
description: 18 pages, ReVTex (International Journal of Quantum Chemistry, in press)
Establishment of a reference interval for glycated albumin based on medical check-up data from multiple medical institutions
Creators: name: Koga, Masafumi
name: Shimizu, Ikki
name: Nakamura, Yasuko
name: Yamakado, Minoru
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Plant Biology

description: Objectives: Data were collected to establish a reference interval for glycated albumin (GA), as well as to calculate a cutoff value for diagnosing diabetes mellitus and the GA level corresponding to a 75-g oral glucose tolerance test (OGTT) 2 h plasma glucose (2h-PG) level of 200 mg/dL. Methods: This study involved 1,843 subjects who were undergoing medical check-ups at several medical institutions and whose HbA1c and GA levels had been measured by OGTT. Results: The GA reference interval that was calculated based on the data obtained from study subjects with normal glucose tolerance was 12.1–17.1%. Using standardized major axis regression, the levels that corresponded to an OGTT 2h-PG level of 11.1 mmol/L were a GA level of 17.5% and an HbA1c level of 47.5 mmol/mol. A receiver-operating characteristic curve analysis was used to calculate the points at which sensitivity and specificity matched as the cutoff values, and the results yielded a GA level of 15.0% (sensitivity 69.3%). Conclusions: The GA reference interval was calculated to be 12.1–17.1%. We propose a GA level of 17.4% as a cutoff value to diagnose diabetes mellitus and a GA level of 15.0% as a screening cutoff value for diabetes mellitus, taking previous reports into account.
Performance and wake characteristics of tidal turbines in an infinitely large array
Creators: name: Ouro, Pablo
name: Nishino, Takafumi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The efficiency of tidal-stream turbines in a large array depends on the balance between negative effects of turbine-wake interactions and positive effects of bypass-flow acceleration due to local blockage, both of which are functions of the layout of turbines. Here we investigate the hydrodynamics of turbines in an infinitely large array with aligned or staggered layouts for a range of streamwise and lateral turbine spacing. First, we present a theoretical analysis based on an extension of the Linear Momentum Actuator Disc Theory (LMADT) for perfectly aligned and staggered layouts, employing a hybrid inviscid-viscous approach to account for the local blockage effect within each turbine row and the viscous (turbulent) wake mixing behind each row in a coupled manner. We perform Large-Eddy Simulation (LES) of open-channel flow for 28 layouts of tidal turbines using an Actuator-Line Method with periodic boundary conditions. Both theoretical and LES results show that the efficiency of turbines (or the power of turbines for a given bulk velocity) in an aligned array decreases as we reduce the streamwise spacing, whereas that in a staggered array remains high and may even increase due to the positive local blockage effect (causing the local flow velocity upstream of each turbine to exceed the bulk velocity) if the lateral turbine spacing is sufficiently small. The LES results further reveal that the amplitude of wake meandering tends to decrease as we reduce the lateral spacing, which leads to a lower wake recovery rate in the near-wake region. These results will help to understand and improve the efficiency of tidal turbines in future large arrays, even though the performance of real tidal arrays may depend not only on turbine-to-turbine interactions but also on macro-scale interactions between the array and natural tidal currents, the latter of which are outside the scope of this study.
Roadmap on Atomic-scale Semiconductor Devices
Creators: name: Schofield, Steven R.
name: Fisher, Andrew J.
name: Ginossar, Eran
name: Lyding, Joseph W.
name: Silver, Richard
name: Fei, Fan
name: Namboodiri, Pradeep
name: Wyrick, Jonathan
name: Masteghin, M. G.
name: Cox, D. C.
name: Murdin, B. N.
name: Clowes, S. K
name: Keizer, Joris G.
name: Simmons, Michelle Y.
name: Stemp, Holly G.
name: Morello, Andrea
name: Voisin, Benoit
name: Rogge, Sven
name: Wolkow, Robert A.
name: Livadaru, Lucian
name: Pitters, Jason
name: Stock, Taylor J. Z.
name: Curson, Neil J.
name: Butera, Robert E.
name: Pavlova, Tatiana V.
name: Jakob, A. M.
name: Spemann, D.
name: Räcke, P.
name: Schmidt-Kaler, F.
name: Jamieson, D. N.
name: Pratiush, Utkarsh
name: Duscher, Gerd
name: Kalinin, Sergei V.
name: Kazazis, Dimitrios
name: Constantinou, Procopios
name: Aeppli, Gabriel
name: Ekinci, Yasin
name: Owen, James H. G.
name: Fowler, Emma
name: Moheimani, S. O. Reza
name: Randall, John N.
name: Misra, Shashank
name: Ivie, Jeffrey
name: Allemang, Christopher R.
name: Anderson, Evan M.
name: Bussmann, Ezra
name: Campbell, Quinn
name: Gao, Xujiao
name: Lu, Tzu-Ming
name: Schmucker, Scott W.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Quantum Physics (quant-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Spin states in semiconductors provide exceptionally stable and noise-resistant environments for qubits, positioning them as optimal candidates for reliable quantum computing technologies. The proposal to use nuclear and electronic spins of donor atoms in silicon, introduced by Kane in 1998, sparked a new research field focused on the precise positioning of individual impurity atoms for quantum devices, utilising scanning tunnelling microscopy and ion implantation. This roadmap article reviews the advancements in the 25 years since Kane's proposal, the current challenges, and the future directions in atomic-scale semiconductor device fabrication and measurement. It covers the quest to create a silicon-based quantum computer and expands to include diverse material systems and fabrication techniques, highlighting the potential for a broad range of semiconductor quantum technological applications. Key developments include phosphorus in silicon devices such as single-atom transistors, arrayed few-donor devices, one- and two-qubit gates, three-dimensional architectures, and the development of a toolbox for future quantum integrated circuits. The roadmap also explores new impurity species like arsenic and antimony for enhanced scalability and higher-dimensional spin systems, new chemistry for dopant precursors and lithographic resists, and the potential for germanium-based devices. Emerging methods, such as photon-based lithography and electron beam manipulation, are discussed for their disruptive potential. This roadmap charts the path toward scalable quantum computing and advanced semiconductor quantum technologies, emphasising the critical intersections of experiment, technological development, and theory.
description: 94 pages
A survey of total IgE reference intervals reported by Scandinavian and British medical laboratories – a need for harmonisation
Creators: name: Vinnes, Erik Wilhelm
name: Sletten, Ida Sofie Karlsen
name: Alnæs, Marie
name: Storaas, Torgeir
name: Aarsand, Aasne K.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: Science Policy

description: There appears to be marked discrepancies between total IgE reference intervals (RIs) in use by many laboratories and those recommended by published studies. The aim of this study was therefore to review total IgE RIs currently reported by Scandinavian and British laboratories and to compare these to published RIs identified by a literature review. Relevant laboratories were identified by test directories provided by the national accreditation bodies in Norway, Sweden, Denmark and the UK. Total IgE RIs and their sources were acquired by accessing laboratory user handbooks or by an electronic survey. In addition a literature review of published total IgE RI studies was performed. From 172 accredited laboratories providing total IgE analysis, data was acquired from 122 laboratories. An adult upper reference limit between 81 to 150 kU/L was reported by 89% of these. Denmark and Sweden reported the most harmonised RIs whilst Norway and the UK exhibited the least degree of harmonisation. Published adult (n = 6) and paediatric (n = 6) RI studies reported markedly higher upper limits than those currently in use by the laboratories included in this study. There were also large variations in the number of age strata in use for paediatric RIs. This study demonstrates large variations in currently utilised IgE RIs by Scandinavian and British accredited laboratories and most report markedly lower RIs than those recommended by recent RI publications. Many laboratories likely utilise outdated RIs and should consider critically reviewing and updating their RIs.
Εποικισμός αρχαιολογικών χώρων και μνημείων από βρυόφυτα:
Creators: name: Παπακώστα, Βασιλική Ζαχαρία
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: βρυόφυτα
εποικισμός
μνημεία
bryophytes
colonization
monuments

description: Σε 8 αρχαιολογικούς χώρους της Βόρειας Ελλάδας, εντοπίστηκαν 32 είδη βρυόφυτων (31 Φυλλόβρυα και ένα Ηπατικό), εκ των οποίων τα πιο κοινά ήταν τα Tortula muralis Hedw. και Didymodon vinealis (Brid.) R. H. Zander. Η μεγαλύτερη ποικιλότητα ειδών αναφέρεται στους αρχαιολογικούς χώρους του Δίου και της Πέλλας, με 15 και 12 είδη αντίστοιχα, ενώ η μικρότερη στον αρχαιολογικό χώρο των Αβδήρων, με μόνο 4 είδη. Τα εκτεθειμένα στο περιβάλλον μνημεία υπόκεινται στη διαβρωτική δράση των βρυόφυτων. Οι κυριότεροι παράγοντες εμφάνισης των βρυόφυτων είναι η έκθεση των μνημείων σε συνθήκες υγρασίας, η παρουσία θρεπτικών συστατικών στις επιφάνειες των δομικών τους υλικών, καθώς και η έκθεσή τους σε ιδιαίτερες συνθήκες θερμοκρασίας και φωτισμού. Το υψηλό πορώδες των υποστρωμάτων και η παρουσία ανωμαλιών, όπως οπών και ρωγμών, ενισχύουν την ανάπτυξη των βρυόφυτων. Οι οριζόντιες επιφάνειες, που συγκρατούν περισσότερο την υγρασία και τα θρεπτικά συστατικά, φαίνεται να προτιμώνται έναντι των κάθετων. Το ίδιο συμβαίνει και με τα τεχνητά υλικά, όπως το κονίαμα, τα οποία χρησιμοποιούνται και στις εργασίες συντήρησης και αποκατάστασης των μνημείων. Στις πλινθόκτιστες τοιχοδομές παρατηρήθηκε πως μεγαλύτερο ποσοστό εποικισμού εμφανίζει το ασβεστοκονίαμα, που χρησιμοποιείται ως συνδετικό υλικό, έναντι των πλίνθων. Σε μία μόνο περίπτωση, στο Δίον, εντοπίστηκε και το αντίστροφο φαινόμενο, δηλαδή προτίμηση της πλίνθου έναντι του ασβεστοκονιάματος. Φωτογραφίες που λήφθηκαν από Ηλεκτρονικό Μικροσκόπιο Σάρωσης (SEM) αποκαλύπτουν το διαβρωτικό ρόλο των ριζοειδών, ως αποτέλεσμα της διεισδυτικότητας και της δικτύωσής τους εντός του υποστρώματος, καθώς και της ενσωμάτωσης μεριδίων του σε αυτά.
description: In 8 archaeological sites in N. Greece, 32 taxa (31 mosses and one hepatic), the most common being Tortula muralis Hedw. and Didymodon vinealis (Brid.) R. H. Zander, were identified. Stone works of art exposed to the environment are liable to be deteriorated by the action of bryophytes. In Dion and Pella, the highest variety - with 15 and 12 taxa respectively - were found, whereas in Abdera only 4 taxa were reported. sColonization of exposed monuments primarily depends on the availability of water, nutrients and exposure to direct solar radiation. A higher porosity of substrates and cracking processes provoke an even greater degree of bryophyte growth. Horizontal surfaces with a better water and nutrition supply are preferred over nutrient-poor, vertical ones. The artificial mortarwork used for restoration processes is preferentially invaded by bryophytes. In Dion, ceramic plinths, due to capillary penetration of water, are more vulnerable to bryophyte colonization than calcareous mortar. SEM images reveal a profuse network of rhizoids penetrating the stone substrate down to the base allowing a higher biodeteriogenic effect.