cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the Delay Limited Secrecy Capacity of Fading Channels
Creators: name: Khalil, Karim
name: Youssef, Moustafa
name: Koyluoglu, O. Ozan
name: Gamal, Hesham El
Publisher: name: arXiv
Year: 2009
Subjects: subject: Information Theory (cs.IT)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: In this paper, the delay limited secrecy capacity of the flat fading channel is investigated under two different assumptions on the available transmitter channel state information (CSI). The first scenario assumes perfect prior knowledge of both the main and eavesdropper channel gains. Here, upper and lower bounds on the secure delay limited capacity are derived and shown to be tight in the high signal-to-noise ratio (SNR) regime (for a wide class of channel distributions). In the second scenario, only the main channel CSI is assumed to be available at the transmitter. Remarkably, under this assumption, we establish the achievability of non-zero secure rate (for a wide class of channel distributions) under a strict delay constraint. In the two cases, our achievability arguments are based on a novel two-stage approach that overcomes the secrecy outage phenomenon observed in earlier works.
description: Proceedings of the 2009 IEEE International Symposium on Information Theory (ISIT 2009), Seoul, Korea, June 28-July 3, 2009
Localization of a Bose-Einstein condensate in a bichromatic optical lattice
Creators: name: Adhikari, S. K.
name: Salasnich, L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: By direct numerical simulation of the time-dependent Gross-Pitaevskii equation we study different aspects of the localization of a non-interacting ideal Bose-Einstein condensate (BEC) in a one-dimensional bichromatic quasi-periodic optical-lattice potential. Such a quasi-periodic potential, used in a recent experiment on the localization of a BEC [Roati et al., Nature 453, 895 (2008)], can be formed by the superposition of two standing-wave polarized laser beams with different wavelengths. We investigate the effect of the variation of optical amplitudes and wavelengths on the localization of a non-interacting BEC. We also simulate the non-linear dynamics when a harmonically trapped BEC is suddenly released into a quasi-periodic potential, {as done experimentally in a laser speckle potential [Billy et al., Nature 453, 891 (2008)]$ We finally study the destruction of the localization in an interacting BEC due to the repulsion generated by a positive scattering length between the bosonic atoms.
description: 8 pages
Topological susceptibility in 2+1 flavors lattice QCD with domain-wall fermions
Creators: name: Chiu, Ting-Wai
name: Hsieh, Tung-Han
name: Tseng, Po-Kai
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We measure the topological charge and its fluctuation for the gauge configurations generated by the RBC and UKQCD Collaborations using 2+1 flavors of domain-wall fermions on the 16^3 x 32 lattice (L \simeq 2 fm) with length 16 in the fifth dimension at inverse lattice spacing a^{-1} \simeq 1.62 GeV. From the spectral flow of the Hermitian operator H_w (2 + γ_5 H_w)^{-1}, we obtain the topological charge Q_t of each gauge configuration in the three ensembles with light sea quark masses m_q a = 0.01, 0.02, and 0.03, and with the strange quark mass fixed at m_s a = 0.04. From our result of Q_t, we compute the topological susceptibilty χ_t = < Q_t^2 > /volume. In the small m_q regime, our result of χ_t agrees with the chiral effective theory. Using the formula χ_t = Σ/ (m_u^{-1} + m_d^{-1} + m_s^{-1}) by Leutwyler-Smilga, we obtain the chiral condensate Σ^MSbar(2 GeV) = [259(6)(9) MeV]^3.
description: 9 pages, 3 EPS figures
Reforming for excellence : towards a collaborative primary school
Creators: name: Revie, Ann
Publisher: name: University Of Tasmania
Year: 2023

description: It is asserted in the introduction of this work that the current reforms for excellence are taking place in a context of extreme complexity, which puts at risk the meanings made of the term 'excellence in schooling'. There is an abundance of literature dealing with the characteristics of an excellent school but the paths towards the creation and maintenance of such a school are not so obvious. Support is given to the view that these paths will only be found by educational leaders', in particular school principals', taking up the challenge and generating models from within. The work traces the movement to create excellence in schooling from the mid 1970's to the present time and explores the parallel movement towards excellence in the corporate sector, with particular attention to the Japanese view of leadership especially that aspect which values people as whole beings with physical, spiritual, social and psychological needs. The work provides a definition of excellence in schooling and addresses the issues of whether or not it can be attained and measured. It also explores the wider context in which reforms for excellence in schooling are taking place in the belief that making meaning of this context will assist educators in the implementation of the reforms. Some of the common assumptions which can inhibit success are examined and the assertion is made that a system view of change is necessary if effective implementation is to be carried out. Leadership is seen as critical and particular emphasis is placed on the importance of vision and on leadership density. The work explores the leadership roles of the school principal with specific focus placed on the importance of culture and the principal's role in shaping that. It is asserted that, in order to have credibility and to be able to keep a finger on the pulse of the school, the principal must maintain a sound educational platform. It is also contended that there is tremendous potential for principals to use their expertise in teaching and learning to generate models for successfully implementing quality reforms. A key feature of the work is the author's expression of her educational platform which emphasises her belief in the need to build a school community of learners centring on collaboration and cooperation among members of the school community. This is followed by a case study of Punch Bowl Primary School, in Launceston, Tasmania. The case study examines how a collaborative culture has been built at the school with resulting high levels of professionalism and of morale at a time when negative stress is evident in the public sector of education and there is low morale in the teaching profession generally.
Strategisk Energiplanlægning for Transport
Creators: name: Høj, Jens Christian Morrell Lodberg
name: Frees, Niels
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Transporten har i mange år været en kæmpe udfordring, når det kommer til at nå de nationalt og lokalt fastsatte målsætninger, hvilket tydeligt blev eksemplificeret i daværende chef for Concito, Martin Lidegaards, udtalelse [1]: ”Transporten er klimaets smertensbarn.” Dette skyldes, at transporten i en lang periode ikke har budt på reelle alternativer til de klassiske brændstoffer, og reduktioner af forbrug har derfor været forbundet med enten forsøg på at flytte folk ud af biler eller gennem Euro-normerne på europæisk niveau. I lang tid havde Danmark endda den grønneste bilpark i Europa som resultat af afgiftsomlægningen fra 2007, hvor biler i mikro og mini-segmentet overtog hovedparten af markedsandelene. Et andet centralt element i omstillingen af transporten, som gør den svær at håndtere fra kommunalt niveau er, at der er tale om et centralt element i den personlige følelse af frihed og identitet for den enkelte. [2] Det betyder at standard processer for strategisk energiplanlægning ikke på samme måde kan appliceres i udviklingen af handlingsplaner, da det i høj grad er et spørgsmål om at forandre folks vaner. Strategisk Enerigplanlægning for Transport kræver således en multidisciplinær proces, hvor der arbejdes struktureret med interessenter på tværs af organisationsgrupper, nye måder at tænke på lokal involvering og lokal forankring samt visionær sammenkobling med eksisterende tiltag. Elementer, som passer mere til industriens strategiprocesser. Dette paper forsøger at kombinere kendte processer til udarbejdelse af strategiske energiplaner med industrielle strategiprocesser for at definere en ny tilgang til arbejdet med dette område. Den beskrevne proces er testet i samarbejde med ProjectZero og Sønderborg Kommune, hvor resultatet er implementeret politisk og i praksis.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
CONSUMER BUYING BEHAVIOR TO ONLINE SHOPPING: A STUDY ON PRIVATE UNIVERSITY STUDENTS OF BANGLADESH
Creators: name: TANVEER MUHAMMAD AL-SHAMS
name: AYSHA ASHRAF
name: MONIJA ISLAM
name: MOINUR RAHMAN
Publisher: name: Zenodo
Year: 2023
Subjects: Consumer; Behavior; Online Shopping; E-Commerce; University Students; Bangladesh.

description: Abstract

Nowadays, Technology has evolved online shopping to become a thriving business. In this industry, Bangladesh has enormous potential. This study aims to understand how the global web has influenced people's attitudes and behaviors. In this study, the descriptive method is utilized to get quick responses from the respondents. In the present study, a non-probabilistic sampling method was used to collect data from the private universities around Dhaka and other divisions. We identified 500 students and conducted personal interviews with them, and 430 of them responded to the survey, yielding a 90% response rate. Ordinal regression analysis has been used to measure the effect of some independent variables on consumer buying behavior. We found that age groups "26-30" and "31-35," specific income ranges, and sources of information such as "Promotional Campaigns" and "Social Media" play a significant role in influencing the outcome. Moreover, better assistance and concentrating on improved client experience to expand.
90 degree polarization rotator using a bilayered chiral metamaterial with giant optical activity
Creators: name: Ye, Yuqian
name: He, Sailing
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A bilayered chiral metamaterial (CMM) is proposed to realize a 90 degree polarization rotator, whose giant optical activity is due to the transverse magnetic dipole coupling among the metallic wire pairs of enantiomeric patterns. By transmission through this thin bilayered structure of less than λ/30 thick, a linearly polarized wave is converted to its cross polarization with a resonant polarization conversion efficiency (PCE) of over 90%. Meanwhile, the axial ratio of the transmitted wave is better than 40 dB. It is demonstrated that the chirality in the propagation direction makes this efficient cross-polarization conversion possible. The transversely isotropic property of this polarization rotator is also experimentally verified. The optical activity of the present structure is about 2700 degree/λ, which is the largest optical activity that can be found in literature.
description: 16 pages, 4 figures
Deep 2MASS Photometry of M67 and Calibration of the Main Sequence J-Ks Color Difference as an Age Indicator
Creators: name: Sarajedini, Ata
name: Dotter, Aaron
name: Kirkpatrick, Allison
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present an analysis of Two Micron All Sky Survey (2MASS) calibration photometry of the old open cluster M67 (NGC 2682). The proper motion-cleaned color-magnitude diagram (CMD) resulting from these data extends ~3 magnitudes deeper than one based on data from the point source catalog. The CMD extends from above the helium-burning red clump to a faint limit that is more than 7 magnitudes below the main sequence turnoff in the Ks band. After adopting a reddening of E(B-V) = 0.041 +/- 0.004 and a metal abundance of [Fe/H] = -0.009 +/- 0.009 based on a survey of published values, we fit the unevolved main sequence of M67 to field main sequence stars with 2MASS photometry and Hipparcos parallaxes. This analysis yields distance moduli of (m-M)Ks = 9.72 +/- 0.05 and (m-M)o = 9.70 +/- 0.05, which are consistent with published values. We compare the theoretical isochrones of Girardi et al. and Dotter et al. to the CMD of M67 and comment on the relative merits of each set of models. These comparisons suggest an age between 3.5 and 4.0 Gyr for M67. The depth of the M67 data make them ideal for the calibration of a new age indicator that has recently been devised by Calamida et al.- the difference in (J-Ks) color between the main sequence turnoff (TO) and the point on the lower main sequence where it turns down (TD) and becomes nearly vertical [D(J-Ks)]. Coupled with deep 2MASS photometry for three other open clusters, NGC 2516, M44, and NGC 6791, we calibrate D(J-Ks) in terms of age and find D(J-Ks) = (3.017 +/- 0.347) - (0.259 +/- 0.037)*Log Age (yrs).
description: 19 pages, 9 figures, accepted for publication in The Astrophysical Journal
Europæernes rejsevaner belyst igennem Ferie- og Forretningsrejseundersøgelserne
Creators: name: Christensen, Linda
name: Nielsen, Otto Anker
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Der er i dag kun en begrænset viden om fjernrejser. Enkelte undersøgelser viser, at fjernrejserne har en substantiel miljømæssig belastning og at rejseaktiviteten vokser hurtigt. Behovet for bedre viden og forståelse af rejseaktiviteten er derfor stor. Mangel på data er en væsentlig grund til de få analyser der findes af fjernrejser. Eurostat indsamler imidlertid hvert år data fra en survey, som alle medlemslande er forpligtede til at gennemføre efter nogle fælles overordnede retningslinier. I Danmark kaldes undersøgelsen Ferie og forretningsrejseundersøgelsen. En Europæisk fællesbetegnelse er snarest Tourism Demand Survey. Selv om undersøgelserne ikke fuldt ud lever op til de krav, man stiller til en transport survey fra en transport tilgang (specielt er der ingen information om rejseafstande), at kvaliteten af undersøgelserne i de enkelte lande er ret blandet, og at data kun foreligger som indikator tabeller, finder forfatterne materialet anvendeligt til at belyse Europæernes rejseaktivitet, ikke mindst fordi det dækker 30 lande over en 15 års tidsserie for en væsentlig del af landene. Paperet præsenterer først en oversigt over rejsefrekvensen i de enkelte lande og en sammenstilling af, hvor stor en del af de enkelte landes befolkning, der foretager private udlands og indenlands rejser med overnatning af forskellig varighed. Derefter gennemføres en analyse af udviklingen i rejsefrekvenser på private udlandsrejser med mindst 4 overnatninger. Analyserne viser, at de 30 lande kan inddeles i 3 grupper, 1) de gamle mellem- og nordeuropæiske medlemslande med den højeste rejsefrekvens på private udlandsrejser og den største andel af befolkningen, der er rejseaktiv, 2) 5 Middelhavslande med en meget lav rejsefrekvens på private udlandsrejser, men med en væsentlig større andel der holder ferie m,v, indenlands samt 3) de nye medlemslande, der har en lavere rejsefrekvens end førstnævnte gruppe, men væsentlig højere end middelhavslandene. Analysen af udviklingen i rejseaktivitet viser en samlet indkomstelasticitet på 1,8 for alle land under ét, og væsentlig over 1 for de 3 grupper hver for sig. Et muligt mætningspunkt i udviklingen diskuteres. Dette foreslås at ligge ved at ca. 90% af befolkningen rejser udenlands årligt og har ca 2 rejser i gennemsnit. Men hertil kommer de kortere rejser, typisk weekendrejser, som ikke er analyseret i detaljer i dette paper.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
Soft X-ray Polarization in Thermal Magnetar Emission
Creators: name: van Adelsberg, Matthew
name: Perna, Rosalba
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Emission spectra from magnetars in the soft X-ray band likely contain a thermal component emerging directly from the neutron star surface. However, the lack of observed absorption-like features in quiescent spectra makes it difficult to directly constrain physical properties of the atmosphere. We argue that future X-ray polarization measurements represent a promising technique for directly constraining the magnetar magnetic field strength and geometry. We construct models of the observed polarization signal from a finite surface hotspot, using the latest NS atmosphere models for magnetic fields B = 4 x 10^13--5 x 10^14 G. Our calculations are strongly dependent on the NS magnetic field strength and geometry, and are more weakly dependent on the NS equation of state and atmosphere composition. We discuss how the complementary dependencies of phase-resolved spectroscopy and polarimetry might resolve degeneracies that currently hamper the determination of magnetar physical parameters using thermal models.
description: 23 pages, 7 figures; MNRAS accepted
Unge Viser Vej – mobilitet og ungdomsuddannelser
Creators: name: Sørensen, Sandra
name: Jepsen, Søren Fischer
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Lange afstande og centraliseringer af uddannelser rammer de unges transport til uddannelsesstederne, derfor er der brug for at understøtte de unges mobilitet. I februar 2017 afholdt Movia et pilotprojekt i samarbejde med Region Sjælland, Holbæk og Odsherred kommune. På to temadage om mobilitet arbejdede 100 unge med at finde løsninger til forskellige transportudfordringer. Formålet var at samle viden og inspiration til udarbejdelsen af et undervisningsforløb, der giver kommunerne et værktøj til at forbedre transporten og mobiliteten til og fra uddannelse for unge, i et samarbejde med de unge selv. Til august afprøves et tilpasset undervisningsforløb som efterfølgende skal være tilgængeligt for kommuner og ungdomsuddannelser i hele landet og kan bruges på tværs af flere klasser og ungdomsuddannelser.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
Environmental Impact of Long Distance Travel
Creators: name: Christensen, Linda
name: Nielsen, Otto Anker
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: This paper presents an analysis of the CO2 emission resulting from long distance travel by Danes. The emissions are analysed as the Danes’ footprint the whole way from Denmark to the final destination. International travel represents 31% of the Danes’ CO2 emission from passenger travel and the climate burden from long overseas distances is especially high even though only few travel overseas. The travel activity is furthermore increasing much more for long distances than for European destinations. Domestic travel activity with overnight stay is nearly stagnating. The study furthermore shows that the Danish development is not especially outstanding compared to other countries.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
Generalized Pascal Triangles and Toeplitz Matrices
Creators: name: Moghaddamfar, A. R.
name: Pooya, S. M. H.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 15A15, 11C20

description: The purpose of this article is to study determinants of matrices which are known as generalized Pascal triangles (see [1]). We present a factorization by expressing such a matrix as a product of a unipotent lower triangular matrix, a Toeplitz matrix and a unipotent upper triangular matrix. The determinant of a generalized Pascal matrix equals thus the determinant of a Toeplitz matrix. This equality allows us to evaluate a few determinants of generalized Pascal matrices associated to certain sequences. In particular, we obtain families of quasi-Pascal matrices whose principal minors generate any arbitrary linear subsequences F(nr+s) or L(nr+s), (n=1, 2, 3, ...) of Fibonacci or Lucas sequence.
description: 15 pages
Hvorfor vokser trafikken på vores veje?
Creators: name: Jacobsen, Anette
name: Nielsen, Thomas S.
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Fra 2000 - 2015 voksede vejtrafikken i gennemsnit med 1,2 pct. om året, men det er gået langt hurtigere i de sidste par år, hvor der er kommet større afstand til finanskrisen. Det er forventningen, at trafikken også vil vedblive med at stige fremover. Landstrafikmodellens basisprognose lyder på en vækst på 14 pct. i vejtrafikken fra 2015 til 2030. For biltrafikken peges der på økonomi (ofte målt som BNP), befolkningens størrelse og sammensætning, priser på biler og kørselsomkostninger, rejsetider og vejkapacitet, erhvervs- og bystruktur, konkurrerende transportformer, såvel som sociale normer og nye teknologier – som de væsentligste drivkræfter. Mange af disse er dækket af de prognosemodeller der anvendes, mens andre falder uden for. Et overblik over trafikkens drivkræfter er med til at give et udgangspunkt for at forstå og foregribe udviklingen, samt overveje indikatorer, der kan understøtte arbejdet med at planlægge fremtidens infrastruktur og trafik.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
Ensemble Inequivalence in Single Molecule Experiments
Creators: name: Süzen, M.
name: Sega, M.
name: Holm, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In bulk systems the calculation of the main thermodynamic quantities leads to the same expectation values in the thermodynamic limit, regardless of the choice of the statistical ensemble. Single linear molecules can be still regarded as statistical systems, where the thermodynamic limit is represented by infinitely long chains. The question of equivalence between different ensembles is not at all obvious and has been addressed in the literature, with sometimes contradicting conclusions. We address this problem by studying the scaling properties of the ensemble difference for two different chain models, as a function of the degree of polymerization. By characterizing the scaling behavior of the difference between the isotensional (Gibbs) and isometric (Helmholtz) ensembles in the transition from the low-stretching to the high-stretching regime, we show that ensemble equivalence cannot be reached for macroscopic chains in the low force regime, and we characterize the transition from the inequivalence to the equivalence regime.
description: Typos in equations fixed. Reference list updated and corrected. Extended
Ozyptila arctica Kulczy
Creators: name: Esyunin, S. L.
name: Kazantsev, D. K
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Thomisidae
Ozyptila
Ozyptila arctica

description: Ozyptila arctica Kulczyṅski, 1908 MATERIAL. 1 ♀, 4, mossy Salix thicket, VII.2007, DK.
description: Published as part of Esyunin, S. L. & Kazantsev, D. K, 2007, On the spider (Aranei) fauna of the Pechoro - Ilychskiy Reserve (North Urals), with the description of a new Agroeca species (Liocranidae), pp. 245-250 in Arthropoda Selecta 16 (4) on page 250, DOI: 10.5281/zenodo.584085
Ozyptila praticola L. Koch 1837
Creators: name: Esyunin, S. L.
name: Kazantsev, D. K
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Thomisidae
Ozyptila
Ozyptila praticola

description: Ozyptila praticola (L. Koch, 1837) * MATERIAL. 1 ♂, 4, low-grasses meadow, VII.2007, DK.
description: Published as part of Esyunin, S. L. & Kazantsev, D. K, 2007, On the spider (Aranei) fauna of the Pechoro - Ilychskiy Reserve (North Urals), with the description of a new Agroeca species (Liocranidae), pp. 245-250 in Arthropoda Selecta 16 (4) on page 250, DOI: 10.5281/zenodo.584085
The status of the Excited Baryon Analysis Center
Creators: name: Julia-Diaz, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The Excited Baryon Analysis Center (EBAC), which is associated with the Theory Group at Jefferson Laboratory, was initiated in 2006. Its main goal is to extract and interpret properties of nucleon resonances (N*) from the world data of meson production reactions induced by pions, photons and electrons. We review the main accomplishments of the center since then and sketch its near future perspectives.
description: Invited plenary talk, to appear in the Proceedings of XIII International Conference on Hadron Spectroscopy, November 29 - December 4, 2009, Florida State University. (v2, references added, fig6 slightly modified)
title: Peri-hepatic Splenosis, an uncommon liver pseudo-tumor: clues to diagnosis with MRI
Creators: name: Rosa, Maria Luísa
Publisher: name: EURORAD
Year: 2022
Subjects: subject: Abdominal imaging
subject: Abdomen
subject: Liver
subject: Spleen
subject: MR
subject: Clinical Cases

description: Clinical History: An abdominal MRI study was performed to study two incidentally discovered liver lesions in an MR-Enterography of a 52-year-old patient who had persistent symptoms related to Crohn’s disease. This patient had a history of previous abdominal trauma more than 2 decades ago and no other relevant medical history.

description: 52 years, male
The influence of hull boundary layers on waterjet intake performance
Creators: name: Roberts, JL
Publisher: name: University Of Tasmania
Year: 2023

description: The influence of hull boundary layers on typical waterjet propulsion system intakes used in the fast catamaran ferry industry has been experimentally and computationally studied. Particular attention was paid to the effect of boundary layer thickness on flow quality at the pump impeller face. A scale waterjet intake model mounted on the side wall of a wind tunnel enabled performance to be determined experimentally. Surface mini-tufts, ingestion streamtube determination, skin friction measurements and velocity and thermal anemometry traverses were used to detail the flow. The most significant observation was the presence of a separation zone on the intake roof. Two complete sets of results were obtained: one with the wind tunnel's naturally thin boundary layer and another with an artificially thickened boundary layer. The latter showed more extensive flow separation. Computational work was conducted using the commercial finite element package FIDAP. Grid independence required a surprisingly large number of nodes (approximately 300,000). However, good agreement with experimental results was obtained with about 120,000 nodes. Waterjet intakes installed on fast catamaran ferries ingest thick hull boundary layers (hull boundary layer thickness is comparable with the intake diameter). Both experimental and computational results show that a thick hull boundary layer adversely effects the performance of such intakes. Therefore, inclusion of thick hull boundary layers in the modelling/ designing of waterjet systems is essential for realistic performance predictions. The intake performance under manoeuvring conditions (zero vessel speed) was also studied both experimentally and computationally. It was found that cut-water flow separation choked the inlet and severely limited the available manoeuvring thrust. Computational results for an increased cut-water radius indicated that substantial improvement is possible with no detrimental effect on cruise performance.
Ozyptila trux Blackwall 1846
Creators: name: Esyunin, S. L.
name: Kazantsev, D. K
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Thomisidae
Ozyptila
Ozyptila trux

description: Ozyptila trux (Blackwall, 1846) MATERIAL. 1 ♀ (PSU- 3247), I, Picea forest with green moss, 23.IX.2003, O.L. Makarova; 1 ♀, I, Betula - Pinus forest, 22.V.2007, DK.
description: Published as part of Esyunin, S. L. & Kazantsev, D. K, 2007, On the spider (Aranei) fauna of the Pechoro - Ilychskiy Reserve (North Urals), with the description of a new Agroeca species (Liocranidae), pp. 245-250 in Arthropoda Selecta 16 (4) on page 250, DOI: 10.5281/zenodo.584085
Agreeing on the future
Creators: name: Endres, Jean Paulo
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: To make long term forecasts include a considerable amount of uncertainty. In this paper, a short review of some of the methods used to forecast mobility demand and planning is made and their strengths and flaws are briefly discussed. For planning Copenhagen’s mobility for the years beyond 2050, the “Future Workshop” was chosen in order to organize a workshop among young mobility and city planning interested persons in Copenhagen. In the workshop three different future visions were elaborated and later analyzed under the Triple Access System theory prism. Among the three envisaged futures, two of them seem to imply and increase in physical mobility demand, while one expects a reduction in physical mobility demand, which will be substituted by increased spatial proximity and digital connectivity.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
Xysticus obscurus Collett 1877
Creators: name: Esyunin, S. L.
name: Kazantsev, D. K
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Thomisidae
Xysticus
Xysticus obscurus

description: Xysticus obscurus Collett, 1877 MATERIAL. 1 ♂, 2, Picea forest with green moss and whortleberry (Facciniummyrtillus), VIII.2007, DK.
description: Published as part of Esyunin, S. L. & Kazantsev, D. K, 2007, On the spider (Aranei) fauna of the Pechoro - Ilychskiy Reserve (North Urals), with the description of a new Agroeca species (Liocranidae), pp. 245-250 in Arthropoda Selecta 16 (4) on page 250, DOI: 10.5281/zenodo.584085
Structural, electronic, and transport properties of silicon nanowires
Creators: name: Rurali, Riccardo
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this paper we review the theory of silicon nanowires. We focus on nanowires with diameters below 10 nm, where quantum effects become important and the properties diverge significantly from those of bulk silicon. These wires can be efficiently treated within electronic structure simulation methods and will be among the most important functional blocks of future nanoelectronic devices. Firstly, we review the structural properties of silicon nanowires, emphasizing the close connection between the growth orientation, the cross-section and the bounding facets. Secondly, we discuss the electronic structure of pristine and doped nanowires, which hold the ultimate key for their applicability in novel electronic devices. Finally, we review transport properties where some of the most important limitations in the performances of nanowire-based devices can lay. Many of the unique properties of these systems are at the same time defying challenges and opportunities for great technological advances.
description: Reviews of Modern Physics, in press
Danskernes forventninger til selvkørende biler.
Creators: name: Nielsen, Thomas A. S.
name: Christiansen, Uffe Æ.
name: Bockhahn, Mathilde Rytter
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Vejdirektoratet har sammen med Wilke undersøgt danskernes forventninger til selvkørende biler med vægt på accept, drivere, bekymringer og brugsforventninger. I overensstemmelse med andre undersøgelser forventer danskerne at køre mere i bil i en situation med helt selvkørende biler. Forventningen dækker både over øget kørsel hverdage og weekends/ferie, længere transportafstande, samt over at forskellige grupper der i dag enten ikke kan køre i bil, eller kan lide at køre bil, forventer at kunne køre mere. De fordele som befolkningen forventer at selvkørende biler giver er især øget sikkerhed, aflastningen fra køre-opgaver og muligheden for at slappe af undervejs. Bekymringerne knytter sig til at miste færdigheder og tabe kontrol, samt spørgsmål om ansvar og muligheder for misbrug/hacking. I forhold til accept og hvem der forventninger at bruge selvkørende biler når det bliver muligt, afspejler undersøgelsens resultater både en sammenhæng med behovet for biltransport, oplevelsen af trængsel; en generel betydning af alder og teknologiorientering; og en mulig betydning af befolkningens erfaringer med fører-støtte systemer i biler (delvis automatisering).
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
A high resolution, hard X-ray photoemission investigation of BaFe$_2$As$_2$: moderate influence of the surface and evidence for a low degree of Fe 3d - As 4p hybridization of the near-E$_F$ electronic states
Creators: name: de Jong, S.
name: Huang, Y.
name: Huisman, R.
name: Massee, F.
name: Thirupathaiah, S.
name: Gorgoi, M.
name: Follath, R.
name: Goedkoop, J. B.
name: Golden, M. S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Photoemission data taken with hard X-ray radiation on cleaved single crystals of the barium parent compound of the MFe$_2$As$_2$ pnictide high temperature superconductor family are presented. Making use of the increased bulk-sensitivity upon hard X-ray excitation, and comparing the results to data taken at conventional VUV photoemission excitation energies, it is shown that the BaFe$_2$As$_2$ cleavage surface provides an electrostatic environment that is slightly different to the bulk, most likely in the form of a modified Madelung potential. However, as the data argue against a different surface doping level, and the surface-related features in the spectra are by no means as dominating as seen in systems such as YBa$_2$Cu$_3$O$_x$, we can conclude that the itinerant, near-E$_F$ electronic states are almost unaffected by the existence of the cleavage surface. Furthermore, exploiting the strong changes in photoionisation cross section between the Fe and As states across the wide photon energy range employed, it is shown that the degree of energetic overlap between the iron 3d and arsenic 4p valence bands is particularly small at the Fermi level, which can only mean a very low degree of hybridization between the Fe 3d and As 4p states near and at E$_F$. Consequently, the itinerancy of the charge carriers in this group of materials involves mainly the Fe 3d - Fe 3d overlap integrals with at best a minor role for the Fe 3d - As 4p hopping parameters, and that the states which support superconductivity upon doping are essentially of Fe 3d character.
description: 8 pages, 3 figures
Færre korte bilture i København
Creators: name: Streuli, Maria Helledi
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: I 2016 blev der for første gang siden de første optællinger i 1970’erne målt flere cykler end biler, der krydser sø- og havnesnittet. Og andelen af ture til arbejde og uddannelse i købehavn på cykel er 41 %. Men Københavns Kommune har endnu ikke nået de ambitiøse mål sat i Kommuneplan 2015, KBH 2025 Klimaplan og Københavns Cykelstrategi 2011-2025. Dette projekt fokuserer på københavnernes egne ture op til 5 km, da det i 2011 viste sig, at der dagligt var 185.800 korte bilture svarende til 32 % af alle bilture eller 18 % af det samlede antal ture.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
High-resolution microwave frequency dissemination on an 86-km urban optical link
Creators: name: Lopez, O.
name: Amy-Klein, A.
name: Lours, M.
name: Chardonnet, Ch.
name: Santarelli, G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report the first demonstration of a long-distance ultra stable frequency dissemination in the microwave range. A 9.15 GHz signal is transferred through a 86-km urban optical link with a fractional frequency stability of 1.3x10-15 at 1 s integration time and below 10-18 at one day. The optical link phase noise compensation is performed with a round-trip method. To achieve such a result we implement light polarisation scrambling and dispersion compensation. This link outperforms all the previous radiofrequency links and compares well with recently demonstrated full optical links.
description: 11 pages, 5 figures
Lancering af Supercykelstier
Creators: name: Secher, Mads Søholm
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Begrebet Supercykelstier er velkendt i det meste af landet. I flere større byer bliver der anlagt cykelstier, der adskiller sig fra de normale cykelstier ved at være et niveau bedre, have større komfort og bedre fremkommelighed. Der er services, som gør den daglige pendlertur nemmere, tryggere og mere behagelig. I foråret 2017 sker der noget nyt på Supercykelstiområdet. Supercykelstisamarbejdet åbner yderligere fem Supercykelstier og sammen med de allerede eksisterende tre Supercykelstier, får hovedstadsregionen nu et sammenhængende net af Supercykelstier som de første i Danmark. Det skal markeres! Derfor lancerer Region Hovedstaden og de 13 deltagende kommuner en indsats for dels at synliggøre nettets eksistens, dels for at motivere flere pendlere på de middellange distancer (5-20 km) til at hoppe på cyklen og gøre brug af supercykelstierne. Som en del af ovenstående indleder Regionen og kommunerne et samarbejde med flere af de virksomheder, der ligger tæt på ruterne, med det formål at få flere medarbejdere til at tage cyklen til og fra arbejde - til fordel for både virksomhederne, pendlerne og samfundsøkonomien. Dette indlæg vil på baggrund af vedhæftede koncept gennemgå resultaterne fra lanceringen af Supercykelstier i foråret 2017 med særligt fokus på samarbejdet med virksomheder og med fokus på bred kommunikation af lanceringen af Supercykelstier.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
Strategi for delebiler i København
Creators: name: Kayser, Annette
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Delebiler har eksisteret i Danmark i 20 år, men udbredelsen er stadig begrænset i forhold til i en række andre lande. Med en stigende interesse for deleøkonomi og nye teknologiske muligheder er delebiler endnu mere aktuelt end tidligere. I en stor by som København, hvor folk bor tæt og hvor meget af den daglige transport foregår på cykel eller med kollektiv trafik, er delebiler en løsning, som både kan bidrage til at spare plads til parkering, mindre bilkørsel og til reduktioner af miljøpåvirkninger. Derfor har Københavns Kommune vedta- get en strategi for delebiler, hvor målet er at øge udbuddet af delebiler fra omkring 250 til 750 inden 2020. Det er et ambitiøst mål, som kræver indsatser både fra kommunens og andre aktørers side. Et af de første tiltag er et forsøg med integration af delebiler i et lokalt gaderum, som gennemføres i foråret 2017.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
Additional file 1 of Fusing an exonuclease with Cas9 enhances homologous recombination in Pichia pastoris
Creators: name: Zhang, Kun
name: Duan, Xingpeng
name: Cai, Peng
name: Gao, Linhui
name: Wu, Xiaoyan
name: Yao, Lun
name: Zhou, Yongjin J.
Publisher: name: figshare
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Table S1. Main plasmids used in the study. Table S2. Primers used in this study. Table S3. Synthesized gene sequence.
On a class of second-order PDEs admitting partner symmetries
Creators: name: Sheftel, M. B.
name: Malykh, A. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 35Q75; 83C15

description: Recently we have demonstrated how to use partner symmetries for obtaining noninvariant solutions of heavenly equations of Plebanski that govern heavenly gravitational metrics. In this paper, we present a class of scalar second-order PDEs with four variables, that possess partner symmetries and contain only second derivatives of the unknown. We present a general form of such a PDE together with recursion relations between partner symmetries. This general PDE is transformed to several simplest canonical forms containing the two heavenly equations of Plebanski among them and two other nonlinear equations which we call mixed heavenly equation and asymmetric heavenly equation. On an example of the mixed heavenly equation, we show how to use partner symmetries for obtaining noninvariant solutions of PDEs by a lift from invariant solutions. Finally, we present Ricci-flat self-dual metrics governed by solutions of the mixed heavenly equation and its Legendre transform.
description: LaTeX2e, 26 pages. The contents change: Exact noninvariant solutions of the Legendre transformed mixed heavenly equation and Ricci-flat metrics governed by solutions of this equation are added. Eq. (6.10) on p. 14 is corrected
Mobilitetspotentiale for Aarhus Letbane
Creators: name: Barfod, Michael Bruhn
name: Kronbak, Jacob
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Nærværende artikel analyserer mobilitetspotentialet for Aarhus Letbane på et strategisk niveau. Det vil sige, at analysen har haft til formål at illustrere mulighederne for mobilitet som følge af etableringen af Aarhus Letbane og dermed give læseren en kvalificeret mulighed for at forholde sig til om og hvordan disse muligheder vil kunne udnyttes. Første del af analysen indledes med at illustrere effekterne på rejsetiden af selve etableringen af letbanen. I den forbindelse er der udviklet et nyt modelværktøjet ud fra en netværkstilgang, der tager højde for hvorledes adgangen til letbanen med gang og cykling påvirkes af fysiske barrierer mv. i transportnetværket. Anden del af analysen illustrerer effekten af forskellige måder at udnytte den ny infrastruktur på. Dette adresseres ved bl.a. at sammenholde konsekvenserne af tilgængelighed til stationer med mobiliteten for passagererne. Metodisk vurderes indførelse af gennemkørselsstationer (stationer hvor letbanetoget ikke nødvendigvis stopper hver gang) som igen muliggør frekvensforøgelser på visse strækninger.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University
A reconstructive workflow at Segni through the EM
Creators: name: Demetrescu, Emanuel
name: Colaiacomo, Federica
name: Valletta, Emilia
name: Fanini, Bruno
name: Pagano, Alfonsina
name: Martuscelli, Marco
name: Averini, Adriano
name: Scopinaro, Eleonora
name: Cocca, Enzo
Publisher: name: Zenodo
Year: 2022

description: Presentation of the use of the Extended Matrix methodology within the #SegniArcheologia project. Conference "EMCON 2022" held online February 4th 2022.
description: funded by AVVISO PUBBLICO "L'IMPRESA FA CULTURA" Progetto integrato per la valorizzazione culturale di specifici tematismi Programma Operativo Regionale FESR Lazio 2014-2020 ASSE PRIORITARIO 3 - COMPETITIVITÀ
Rolling of Coxeter polyhedra along mirrors
Creators: name: Alekseevsky, Dmitri V.
name: Michor, Peter W.
name: Neretin, Yurii A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Metric Geometry (math.MG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 51F15, 53C20, 20F55, 22E40

description: The topic of the paper are developments of $n$-dimensional Coxeter polyhedra. We show that the surface of such polyhedron admits a canonical cutting such that each piece can be covered by a Coxeter $(n-1)$-dimensional domain.
description: 20pages, 15 figures
The Issue of Stability of Revenue in Pig Production in Poland
Creators: name: Rembisz, Włodzimierz
name: Zawadzka, Danuta
name: Rembisz, Włodzimierz
name: Zawadzka, Danuta
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: purchase price of pigs
subject: pig cycle
subject: King effect

description: Pig production is subject to fluctuations due to the pig cycle. These fluctuations cause that the supply of pork is either excessively high or too low in relation to a given demand assumed on the ceteris paribus principle. In the former case, the prices of pork, especially livestock, are high, and in the latter, they are low. As a result, the revenue of agricultural producers changes accordingly. It can be assumed that the negative revenue effects of the decrease in purchase prices are compensated by the positive effects of higher sales of porkers. Therefore, it is assumed that the volatility of revenues should be lower than that of both components. The purpose of this article is to verify this view, which can be regarded as a hypothesis. To be more exact, the paper attempts to answer the question whether there is volatility or relative stability of revenues in the pig market. This issue is important not only for the producers, but also for the agricultural policy. Using simple statistical methods, the authors evaluate the variability of revenues between 2005 and 2020, i.e. after Poland’s accession to the European Union. Recognizing that this was not a homogeneous period, the research also involved the revenues in two sub-periods, i.e. 2005-2012 and 2013-2020. The adopted assumption and the research hypothesis about the relative stability of revenue due to a certain interchangeability of the price level and the purchase volume were only quite incomplete for the period 2005-2012. For period 2013-2020, the analysis of charts, coefficients of variation and correlation gave different results that did not allow for confirming the assumption and hypothesis.
Kollektiv transport i lyset af selvkørende køretøjer
Creators: name: Magelund, Lykke
name: Kvalø, Sveinung André
Publisher: name: Proceedings from the Annual Transport Conference at Aalborg University
Year: 2017

description: Fremtiden for den kollektiv transport tegner sig vidt forskelligt i udredninger om situationen efter "disruption" og indfasning af selvkørende køretøjer. Der er imidlertid enighed om, at i det omfang der fortsat vil eksisterer kollektiv transport, så vil det være i en anden form end vi kender i dag. I artiklen beskrives, hvordan spørgsmålet om fremtidens transport - især fremtidens kollektiv transport - behandles i nyere udredninger om emnet. Artiklen baseres på et litteraturstudie gennemført for trafikselskabet Ruter i Oslo.
description: Proceedings from the Annual Transport Conference at Aalborg University, Vol. 24 No. 1 (2017): Proceedings from the Annual Transport Conference at Aalborg University