cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tailored Source Code Transformations to Synthesize Computationally Diverse Program Variants
Creators: name: Baudry, Benoit
name: Allier, Simon
name: Monperrus, Martin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: The predictability of program execution provides attackers a rich source of knowledge who can exploit it to spy or remotely control the program. Moving target defense addresses this issue by constantly switching between many diverse variants of a program, which reduces the certainty that an attacker can have about the program execution. The effectiveness of this approach relies on the availability of a large number of software variants that exhibit different executions. However, current approaches rely on the natural diversity provided by off-the-shelf components, which is very limited. In this paper, we explore the automatic synthesis of large sets of program variants, called sosies. Sosies provide the same expected functionality as the original program, while exhibiting different executions. They are said to be computationally diverse. This work addresses two objectives: comparing different transformations for increasing the likelihood of sosie synthesis (densifying the search space for sosies); demonstrating computation diversity in synthesized sosies. We synthesized 30184 sosies in total, for 9 large, real-world, open source applications. For all these programs we identified one type of program analysis that systematically increases the density of sosies; we measured computation diversity for sosies of 3 programs and found diversity in method calls or data in more than 40% of sosies. This is a step towards controlled massive unpredictability of software.
Mechanical criticality of fiber networks at a finite temperature
Creators: name: Arzash, Sadjad
name: Gannavarapu, Anupama
name: MacKintosh, Fred C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: At zero temperature, spring networks with connectivity below Maxwell's isostatic threshold undergo a mechanical phase transition from a floppy state at small strains to a rigid state for applied shear strain above a critical strain threshold. Disordered networks in the floppy mechanical regime can be stabilized by entropic effects at finite temperature. We develop a scaling theory based on a real-space renormalization approach for this mechanical phase transition at finite temperature, yielding relationships between various scaling exponents. Using Monte Carlo simulations, we verify these scaling relations and identify anomalous entropic elasticity with sub-linear $T$-dependence in the linear elastic regime. While our results are consistent prior studies of phase behavior near the isostatic point, the present work also makes predictions relevant to the broad class of disordered thermal semiflexible polymer networks for which the connectivity generally lies far below the isostatic threshold.
Deep Multiple Kernel Learning
Creators: name: Strobl, Eric
name: Visweswaran, Shyam
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Deep learning methods have predominantly been applied to large artificial neural networks. Despite their state-of-the-art performance, these large networks typically do not generalize well to datasets with limited sample sizes. In this paper, we take a different approach by learning multiple layers of kernels. We combine kernels at each layer and then optimize over an estimate of the support vector machine leave-one-out error rather than the dual objective function. Our experiments on a variety of datasets show that each layer successively increases performance with only a few base kernels.
description: 4 pages, 1 figure, 1 table, conference paper
An observation on Feynman diagrams with axial anomalous subgraphs in dimensional regularization with an anticommuting $γ_5$
Creators: name: Chen, Long
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Through the calculation of the matrix element of the singlet axial-current operator between the vacuum and a pair of gluons in dimensional regularization with an anticommuting $γ_5$ defined in a Kreimer-scheme variant, we find that additional renormalization counter-terms proportional to the Chern-Simons current operator are needed starting from $\mathcal{O}(α_s^2)$ in QCD. This is in contrast to the well-known purely multiplicative renormalization of the singlet axial-current operator defined with a non-anticommuting $γ_5$. Consequently, without introducing compensation terms in the form of additional renormalization, the Adler-Bell-Jackiw anomaly equation does not hold automatically in the bare form in this kind of schemes. We determine the corresponding (gauge-dependent) coefficient to $\mathcal{O}(α_s^3)$ in QCD, using a variant of the original Kreimer prescription which is implemented in our computation in terms of the standard cyclic trace together with a constructively-defined $γ_5$. Owing to the factorized form of these divergences, intimately related to the axial anomaly, we further performed a check, using concrete examples, that with $γ_5$ treated in this way, the axial-current operator needs no more additional renormalization in dimensional regularization but \textit{only} for non-anomalous amplitudes in a perturbatively renormalizable theory. To be complete, we provide a few additional ingredients needed for a proposed extension of the algorithmic procedure formulated in the above analysis to potential applications to a renormalizable anomaly-free chiral gauge theory, i.e.~the electroweak theory.
description: Refined formuation of the algorithmic procedure to manipulate $\gamma_5$ with more discussions; a novel extension of the prescription proposed for applications to the Standard Model provided in the Appendix. Accepted for publication in JHEP
On the Fattorini Criterion for Approximate Controllability and Stabilizability of Parabolic Systems
Creators: name: Badra, Mehdi
name: Takahashi, Takéo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper, we consider the well-known Fattorini's criterion for approximate controllability of infinite dimensional linear systems of type $y'=A y+Bu$. We precise the result proved by H. O. Fattorini in \cite{Fattorini1966} for bounded input $B$, in the case where $B$ can be unbounded or in the case of finite-dimensional controls. More precisely, we prove that if Fattorini's criterion is satisfied and if the set of geometric multiplicities of $A$ is bounded then approximate controllability can be achieved with finite dimensional controls. An important consequence of this result consists in using the Fattorini's criterion to obtain the feedback stabilizability of linear and nonlinear parabolic systems with feedback controls in a finite dimensional space. In particular, for systems described by partial differential equations, such a criterion reduces to a unique continuation theorem for a stationary system. We illustrate such a method by tackling some coupled Navier-Stokes type equations (MHD system and micropolar fluid system) and we sketch a systematic procedure relying on Fattorini's criterion for checking stabilizability of such nonlinear systems. In that case, the unique continuation theorems rely on local Carleman inequalities for stationary Stokes type systems.
CEN34 -- High-Mass YSO in M17 or Background Post-AGB Star?
Creators: name: Chen, Zhiwei
name: Nuernberger, Dieter
name: Chini, Rolf
name: Liu, Yao
name: Fang, Min
name: Jiang, Zhibo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the proposed high-mass young stellar object (YSO) candidate CEN34, thought to be associated with the star forming region M17. Its optical to near-infrared (550-2500 nm) spectrum reveals several photospheric absorption features, such as Hα, Ca triplet and CO bandheads but lacks any emission lines. The spectral features in the range 8375-8770Å are used to constrain an effective temperature of 5250\pm250 (early-/mid-G) and a surface gravity of 2.0\pm0.3 (supergiant). The spectral energy distribution of CEN34 resembles the SED of a high-mass YSO or an evolved star. Moreover, the observed temperature and surface gravity are identical for high-mass YSOs and evolved stars. The radial velocity relative to LSR (V_LSR) of CEN34 as obtained from various photospheric lines is of the order of -60 km/s and thus distinct from the +25 km/s found for several OB stars in the cluster and for the associated molecular cloud. The SED modeling yields ~ 10^{-4} M_sun of circumstellar material which contributes only a tiny fraction to the total visual extinction (11 mag). In the case of a YSO, a dynamical ejection process is proposed to explain the V_LSR difference between CEN34 and M17. Additionally, to match the temperature and luminosity, we speculate that CEN34 had accumulated the bulk of its mass with accretion rate > 4x10^{-3} M_sun/yr in a very short time span (~ 10^3 yrs), and currently undergoes a phase of gravitational contraction without any further mass gain. However, all the aforementioned characteristics of CEN34 are compatible with an evolved star of 5-7 M_sun and an age of 50-100 Myrs, most likely a background post-AGB star with a distance between 2.0 kpc and 4.5 kpc. We consider the latter classification as the more likely interpretation. Further discrimination between the two possible scenarios should come from the more strict confinement of CEN34's distance.
description: 8 pages, 8 figures, 2 tables; accepted by A&A
EasyHeC: Accurate and Automatic Hand-eye Calibration via Differentiable Rendering and Space Exploration
Creators: name: Chen, Linghao
name: Qin, Yuzhe
name: Zhou, Xiaowei
name: Su, Hao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Hand-eye calibration is a critical task in robotics, as it directly affects the efficacy of critical operations such as manipulation and grasping. Traditional methods for achieving this objective necessitate the careful design of joint poses and the use of specialized calibration markers, while most recent learning-based approaches using solely pose regression are limited in their abilities to diagnose inaccuracies. In this work, we introduce a new approach to hand-eye calibration called EasyHeC, which is markerless, white-box, and delivers superior accuracy and robustness. We propose to use two key technologies: differentiable rendering-based camera pose optimization and consistency-based joint space exploration, which enables accurate end-to-end optimization of the calibration process and eliminates the need for the laborious manual design of robot joint poses. Our evaluation demonstrates superior performance in synthetic and real-world datasets, enhancing downstream manipulation tasks by providing precise camera poses for locating and interacting with objects. The code is available at the project page: https://ootts.github.io/easyhec.
description: Project page: https://ootts.github.io/easyhec
Machine Learning and Structure Formation in Modified Gravity
Creators: name: Betts, Jonathan C.
name: van de Bruck, Carsten
name: Arnold, Christian
name: Li, Baojiu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: In General Relativity approximations based on the spherical collapse model such as Press--Schechter theory and its extensions are able to predict the number of objects of a certain mass in a given volume. In this paper we use a machine learning algorithm to test whether such approximations hold in screened modified gravity theories. To this end, we train random forest classifiers on data from N-body simulations to study the formation of structures in $Λ$CDM as well as screened modified gravity theories, in particular $f(R)$ and nDGP gravity. The models are taught to distinguish structure membership in the final conditions from spherical aggregations of density field behaviour in the initial conditions. We examine the differences between machine learning models that have learned structure formation from each gravity, as well as the model that has learned from $Λ$CDM. We also test the generalisability of the $Λ$CDM model on data from $f(R)$ and nDGP gravities of varying strengths, and therefore the generalisability of Extended-Press-Schechter spherical collapse to these types of modified gravity.
description: 9 pages, 8 figures
Evolution of the Lord Howe Volcano
Creators: name: Tabrett, David J.
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Lord Howe Island (31° 33°S, 159° 05' E), located on the western edge of the Lord Howe Rise, is the remnant of a Miocene (McDougall et al, 1981), subaerial shield volcano at the southern end of the Lord Howe Seamount chain. Lavas in the north dip 5° to the northwest and are cut by sub vertical dykes that strike to the southeast. The lavas in the southern part of the island dip at approximately 3° to the south. The petrography and magnetic fabric suggests the magma in the dykes in the north flowed at a low angle to the northwest. The vent, as inferred from the strike of the dykes, and the dips of the lavas, is located in the southern part of the island to the northeast of Mt Lidgbird. At the maximum size, the Lord Howe Volcano had an average radius of 18km at the base some 2km below sea-level and had a subaerial base radius of approximately 8km and reached an elevation of approximately 1km above sea-level. The volcano had a maximum volume of approximately 1000km3, with both the subaqueous pillow cone and the subaerial shield each having a volume of about 65km3 each. The volcanogenic sediment deposited on the flanks of the volcano had a volume of approximately 870km3 that represents a volume of erupted of approximately 400km3, assuming basalt weathers to twice the volume of the volcanogenic sediments (Sample and Karig, 1982). The difference in volume between the basalt that formed the volcanogenic sediments, pillow and shield cones and the total volume of the volcano is due to the constant erosion and eruption of material over the time the volcano was active (approximately 1 Ma). Estimates of eruption rates and from age constraints of the Lord Howe Basalts it is inferred that the volcano took approximately 0.1Ma to construct the pillow cone, and almost 1Ma to construct the subaerial shield cone. Significant erosion has resulted in the present-day island representing approximately 1 % of the volume of the original subaeial shield. Coastal erosion has occurred at more than 11cm per Ma, while subaerial erosion at 20m per Ma. Geochemically the lavas and dykes (Mg# ~70, D.I. ~32) from Lord Howe Island are similar. Tholeiitic and transitional basalts are dominant with some samples from the youngest rocks in the south being more alkaline. Clinopyroxene compositions of En 46:Fs11:Wo44 are calcic augites and are present as phenocrysts in both the lavas, dykes and an ankaramite sample. The anakaramite contains cumulates of olivine (Fo80) and clinopyroxene. The basalts are classified as continental, intra-plate basalts and are comparable to the ocean island basaltic signatures of eastern Australia.
On the recently proposed Mimetic Dark Matter
Creators: name: Golovnev, Alexey
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently, an interesting gravitational model was proposed in order to mimic the effect of Dark Matter. Chamseddine and Mukhanov in the arXiv preprint 1308.5410 have separated the conformal mode of a physical metric in the form of a squared gradient of an auxiliary scalar field. Notably, the variational principle has given a more general equation of motion than that of purely Einsteinian relativity theory, with a possibility of reproducing an effective Dark Matter. In this short paper, we explain the nature of this phenomenon in terms of the class of functions on which the variation takes place. Then we give a more transparent equivalent formulation of the model without an auxiliary metric. Finally, we speculate a bit about possible extensions.
description: 3 pages; minor corrections
"Nunmehr geht es um die Frage, ob das Luthertum als Kirche bleiben wird!"
Creators: name: Huss, Hans S.
Publisher: name: Lutherische Kirche in der Welt
Year: 1970

description: Lutherische Kirche in der Welt, Bd. 43 (1996): Lutherische Kirche in der Welt, Band 43
Effective rectification of THz electromagnetic fields in a ferrimagnetic iron garnet
Creators: name: Blank, T. G. H.
name: Mashkovich, E. A.
name: Grishunin, K. A.
name: Schippers, C.
name: Logunov, M. V.
name: Koopmans, B.
name: Zvezdin, A. K.
name: Kimel, A. V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: It is found that single-cycle THz electromagnetic fields efficiently excite a GHz spin resonance mode in ferrimagnetic Tm$_3$Fe$_5$O$_{12}$, despite the near absence of GHz spectral components in the exciting THz pulse. By analyzing how the efficiency of excitation depends on the orientation and strength of the THz electric field, we show that it can be explained in terms of the nonlinear THz inverse Cotton-Mouton effect. Here, the THz electric field gets effectively rectified and acts on the ferrimagnetic spins as a uni-polar effective magnetic field pulse. This interpretation is confirmed by a theoretical model based on the phenomenological analysis of the effective magnetic field, combined with the equations of motion derived from the effective Lagrangian for a ferrimagnet. Moreover, by using the outcome of two-dimensional THz spectroscopy, we conjecture a quantum-mechanical interpretation of the observed effect in terms of stimulated Raman scattering of THz photons by the crystal-field split f-f electronic transitions of Tm$^{3+}$.
description: 15 pages, 9 figures
High fidelity gate operations within the coupled nuclear and electron spins of a nitrogen vacancy center in diamond
Creators: name: Everitt, Mark S.
name: Devitt, Simon
name: Munro, W. J.
name: Nemoto, Kae
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this article we investigate the dynamics of a single negatively charged nitrogen-vacancy center (NV-) coupled to the spin of the nucleus of a 15-nitrogen atom and show that high fidelity gate operations are possible without the need for complicated composite pulse sequences. These operations include both the electron and nuclear spin rotations, as well as an entangling gate between them. These are experimentally realizable gates with current technology of sufficiently high fidelities that they can be used to build graph states for quantum information processing tasks.
description: 9 pages & 6 Figures. Comments welcome
Bimodal island size distribution in heteroepitaxial growth
Creators: name: Chinta, P. V.
name: Headrick, R. L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A bimodal size distribution of two dimensional islands is inferred during interface formation in heteroepitaxial growth of Bismuth Ferrite on (001) oriented SrTiO3 by sputter deposition. Features observed by in-situ x-ray scattering are explained by a model where coalescence of islands determines the growth kinetics with negligible surface diffusion on SrTiO3. Small clusters maintain a compact shape as they coalesce, while clusters beyond a critical size impinge to form large irregular connected islands and a population of smaller clusters forms in the spaces between the larger ones.
description: 4 pages, 4 figures. Accepted for publication in Phys. Rev. Lett
A Schwarzschild model of the Galactic bar with initial density from N-body simulations
Creators: name: Wang, Yougang
name: Mao, Shude
name: Long, Richard J.
name: Shen, Juntai
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using the potential from N-body simulations, we construct the Galactic bar models with the Schwarzschild method. By varying the pattern speed and the position angle of the bar, we find that the best-fit bar model has pattern speed $Ω_{\rm p}=40\ \rm{km\ s^{-1}\ kpc^{-1}}$, and bar angle $θ_{\rm bar}=45^{\circ}$. $N$-body simulations show that the best-fit model is stable for more than 1.5 Gyrs. Combined with the results in Wang et al. (2012), we find that the bar angle and/or the pattern speed are not well constrained by BRAVA data in our Schwarzschild models. The proper motions predicted from our model are slightly larger than those observed in four fields. In the future, more kinematic data from the ground and space-based observations will enable us to refine our model of the Milky Way bar.
description: 10 pages, 7 figures, 2 tables. Accepted for publication in MNRAS
Phase-locking an interferometer with single-photon detections
Creators: name: Hacker, Bastian
name: Günthner, Kevin
name: Rößler, Conrad
name: Marquardt, Christoph
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on a novel phase-locking technique for fiber-based Mach-Zehnder interferometers based on discrete single-photon detections, and demonstrate this in a setup. Our interferometer decodes relative-phase-encoded optical pulse pairs for quantum key distribution applications and requires no locking laser in addition to the weak received signal. Our new simple locking scheme is shown to produce an Ornstein-Uhlenbeck dynamic and achieve optimal phase noise for a given count rate. In case of wavelength drifts that arise during the reception of Doppler-shifted satellite signals, the arm-length difference gets continuously readjusted to keep the interferometer phase stable.
description: 13 pages
Dimension-independent spectral gap of polar slice sampling
Creators: name: Rudolf, Daniel
name: Schär, Philip
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistics Theory (math.ST)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 65C05 (Primary) 60J05, 60J22 (Secondary)

description: Polar slice sampling, a Markov chain construction for approximate sampling, performs, under suitable assumptions on the target and initial distribution, provably independent of the state space dimension. We extend the aforementioned result of Roberts & Rosenthal (2002) by developing a theory which identifies conditions, in terms of a generalized level set function, that imply an explicit lower bound on the spectral gap even in a general slice sampling context. Verifying the identified conditions for polar slice sampling yields a lower bound of 1/2 on the spectral gap for arbitrary dimension if the target density is rotationally invariant, log-concave along rays emanating from the origin and sufficiently smooth. The general theoretical result is potentially applicable beyond the polar slice sampling framework.
description: 14 pages, 2 figures
Εκτίμηση αξίας μη εισηγμένης εταιρείας με μεθόδους προεξόφλησης ταμειακών ροών
Creators: name: Κλάδη Μανώλη, Ελένη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Αποτίμηση
subject: Αξία επιχείρησης
subject: Προεξοφλημένες ταμειακές ροές
subject: Ταμειακές ροές

description: Η παρούσα διπλωματική εργασία έχει ως βασικό αντικείμενο πραγμάτευσης τις μεθόδους αποτίμησης αξίας επιχειρήσεων και την εφαρμογή της μεθόδου των προεξοφλημένων ταμειακών ροών για την χρηματοοικονομική ανάλυση της Μασούτης Α.Ε. Το ερευνητικό αντικείμενο προσεγγίστηκε σε δύο επίπεδα, δηλαδή βιβλιογραφικά και με την εφαρμοσμένη μελέτη της χρηματοοικονομικής κατάστασης της Μασούτης Α.Ε. Σε βιβλιογραφικό επίπεδο ορίστηκαν οι βασικές έννοιες των θεωριών αποτίμησης, όπως η αξία, το κόστος, η τιμή κ.λπ., επίσης παρατέθηκαν και οι βασικές θεωρίες αποτίμησης και η σχέση τους με τις οικονομικές καταστάσεις και τους ισολογισμούς. Επιπρόσθετα, αναλύθηκαν εκτενώς τέσσερεις βασικές μέθοδοι που χρησιμοποιούνται για την αποτίμηση της αξίας και κυρίως η μέθοδος των προεξοφλημένων ταμειακών ροών, η οποία και εφαρμόστηκε για την τεχνική χρηματοοικονομική μελέτη της Μασούτης Α.Ε.
Optimal scheduling in probabilistic imaginary-time evolution on a quantum computer
Creators: name: Nishi, Hirofumi
name: Hamada, Koki
name: Nishiya, Yusuke
name: Kosugi, Taichi
name: Matsushita, Yu-ichiro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Ground-state preparation is an important task in quantum computation. The probabilistic imaginary-time evolution (PITE) method is a promising candidate for preparing the ground state of the Hamiltonian, which comprises a single ancilla qubit and forward- and backward-controlled real-time evolution operators. The ground state preparation is a challenging task even in the quantum computation, classified as complexity-class quantum Merlin-Arthur. However, optimal parameters for PITE could potentially enhance the computational efficiency to a certain degree. In this study, we analyze the computational costs of the PITE method for both linear and exponential scheduling of the imaginary-time step size for reducing the computational cost. First, we analytically discuss an error defined as the closeness between the states acted on by exact and approximate imaginary-time evolution operators. The optimal imaginary-time step size and rate of change of imaginary time are also discussed. Subsequently, the analytical discussion is validated using numerical simulations for a one-dimensional Heisenberg chain. From the results, we find that linear scheduling works well in the case of unknown eigenvalues of the Hamiltonian. For a wide range of eigenstates, the linear scheduling returns smaller errors on average. However, the linearity of the scheduling causes problems for some specific energy regions of eigenstates. To avoid these problems, incorporating a certain level of nonlinearity into the scheduling, such as by inclusion of an exponential character, is preferable for reducing the computational costs of the PITE method. The findings of this study can make a significant contribute to the field of ground-state preparation of many-body Hamiltonians on quantum computers.
description: 16 pages, 9 figures
Experiences of Australian pregnant women seeking chiropractic care for low back and pelvic girdle pain: a qualitative exploration
Creators: name: Bernard-Giglio, Maria
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Introduction: Pregnancy-related low back and/or pelvic girdle pain is common, with more than two-thirds of Australian pregnant women experiencing low back pain, and almost half experiencing pelvic girdle pain. With 20% of Australian pregnant women visiting a chiropractor for this condition, little is known about the experience of pregnant women who seek chiropractic care for treatment of low back and/or pelvic girdle pain. Aim: To explore and describe the experiences of Australian pregnant women who seek chiropractic care for their pregnancy-related low back and/or pelvic girdle pain. Methods: A qualitative case study approach with purposive sampling was used. A constructivist and interpretivist stance provided understanding and meaning to the pregnant women’s lived experiences. Unstructured interviews, using an audio-visual recording on Zoom, were performed, and supplemented by a respondent’s characteristic survey and the pelvic girdle questionnaire. A grounded theory approach was used in coding and data analysis, until thematic saturation was observed. A thematic analysis, based on a framework of transcribed interviews, memos, survey findings with triangulation and respondent validation was undertaken. Macquarie University ethics approval was obtained for this study (#: 52020621817665). Results: From 27 chiropractic practices, 16 potential participants contacted the research student. After eligibility screening, nine interviews were undertaken. The thematic analysis identified four key themes: care driver, care barrier, chiropractic treatment and response to care. Conclusion: Four insightful key themes were identified from pregnant women who sought chiropractic care for their pregnancy-related low back and pelvic girdle pain. The themes support an overarching substantive-level theory that chiropractic care for pregnant woman experiencing low back pain and pelvic girdle pain improves their pain, function, and pregnancy-related biopsychosocial concerns. A second substantive-level theory addressed the effect of chiropractic care on birthing outcomes. Due to the qualitative nature, findings have only “naturalistic” generalisability and general transferability; however, the findings may inform antenatal providers and the chiropractic profession about pregnant women’s experience with chiropractic care and direct future research.
Low frequency signals of large scale GW-interferometers
Creators: name: Gusev, A. V.
name: Rudenko, V. N.
name: Yudin, I. S
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Application of the large scale gravitational wave interferometers for measurement of geophysical signals at very low frequencies is considered. Analysis is concentrated on the mechanism of penetration of quasistatic geophysical perturbation through the main interferometer output. It is shown that it has a parametrical nature resulted in slow variations of the optical transfer function of the interferometer. Geophysical modulation index is calculated for any harmonical component of the output spectrum, but mainly for a photon circulation frequency appeared in the case of stochastic illumination of modes neighbour to the central resonance. Value of the effect is estimated for different operational regimes of the device. For improvement of geophysical signal readout a modernization of the instrument with using of two component resonance optical pump is proposed and a correspondent calculation is carried out. Numerical estimations for different regimes of the setup are given together with discussion of possible application for measuring some weak gravitational effects.
description: 29 pages, 1 figure, submitted to Classical and Quantum Gravity
Spin-polarons in an exchange model
Creators: name: Navarro, O.
name: Vallejo, E.
name: Avignon, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Spin-polarons are obtained using an Ising-like exchange model consisting of double and super-exchange interactions in low dimensional systems. At zero temperature, a new phase separation between small magnetic polarons, one conduction electron self-trapped in a magnetic domain of two or three sites, and the anti-ferromagnetic phase was previously reported. On the other hand the important effect of temperature was missed. Temperature diminishes Boltzmann probability allowing excited states in the system. Static magnetic susceptibility and short-range spin-spin correlations at zero magnetic field were calculated to explore the spin-polaron formation. At high temperature Curie-Weiss behavior is obtained and compared with the Curie-like behavior observed in a nickelate one-dimensional compound.
description: 6 pages, 13 figures
Intersections of multiplicative translates of 3-adic Cantor sets
Creators: name: Abram, William
name: Lagarias, Jeffrey C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Dynamical Systems (math.DS)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 11A63, 11K55, 37B10

description: Motivated by a question of Erdős, this paper considers questions concerning the discrete dynamical system on the 3-adic integers given by multiplication by 2. Let the 3-adic Cantor set consist of all 3-adic integers whose expansions use only the digits 0 and 1. The exception set is the set of 3-adic integers whose forward orbits under this action intersects the 3-adic Cantor set infinitely many times. It has been shown that this set has Hausdorff dimension 0. Approaches to upper bounds on the Hausdorff dimensions of these sets leads to study of intersections of multiplicative translates of Cantor sets by powers of 2. More generally, this paper studies the structure of finite intersections of general multiplicative translates of the 3-adic Cantor set by integers 1 < M_1 < M_2 < ...< M_n. These sets are describable as sets of 3-adic integers whose 3-adic expansions have one-sided symbolic dynamics given by a finite automaton. As a consequence, the Hausdorff dimension of such a set is always of the form log(β) for an algebraic integer β. This paper gives a method to determine the automaton for given data (M_1, ..., M_n). Experimental results indicate that the Hausdorff dimension of such sets depends in a very complicated way on the integers M_1,...,M_n.
description: v1, 31 pages, 6 figures
On the degeneracies between baryons, massive neutrinos and f(R) gravity in Stage IV cosmic shear analyses
Creators: name: Mancini, A. Spurio
name: Bose, B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Modelling nonlinear structure formation is essential for current and forthcoming cosmic shear experiments. We combine the halo model reaction formalism, implemented in the REACT code, with the COSMOPOWER machine learning emulation platform, to develop and publicly release REACTEMU-FR, a fast and accurate nonlinear matter power spectrum emulator for $f(R)$ gravity with massive neutrinos. Coupled with the state-of-the-art baryon feedback emulator BCEMU, we use REACTEMU-FR to produce Markov Chain Monte Carlo forecasts for a cosmic shear experiment with typical Stage IV specifications. We find that the inclusion of highly nonlinear scales (multipoles between $1500\leq \ell \leq 5000$) only mildly improves constraints on most standard cosmological parameters (less than a factor of 2). In particular, the necessary modelling of baryonic physics effectively damps most constraining power on the sum of the neutrino masses and modified gravity at $\ell \gtrsim 1500$. Using an approximate baryonic physics model produces mildly improved constraints on cosmological parameters which remain unbiased at the $1σ$-level, but significantly biases constraints on baryonic parameters at the $> 2σ$-level.
description: 16 pages, 10 figures. Accepted for publication in The Open Journal of Astrophysics. REACTEMU-FR available at https://github.com/cosmopower-organization/reactemu-fr
Grasping Extreme Aerodynamics on a Low-Dimensional Manifold
Creators: name: Fukami, Kai
name: Taira, Kunihiko
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Modern air vehicles perform a wide range of operations, including transportation, defense, surveillance, and rescue. These aircraft can fly in calm conditions but avoid operations in gusty environments, encountered in urban canyons, over mountainous terrains, and in ship wakes. With extreme weather becoming ever more frequent due to global warming, it is anticipated that aircraft, especially those that are smaller in size, will encounter sizeable atmospheric disturbances and still be expected to achieve stable flight. However, there exists virtually no theoretical fluid-dynamic foundation to describe the influence of extreme vortical gusts on wings. To compound this difficulty, there is a large parameter space for gust-wing interactions. While such interactions are seemingly complex and different for each combination of gust parameters, we show that the fundamental physics behind extreme aerodynamics is far simpler and lower-rank than traditionally expected. We reveal that the nonlinear vortical flow field over time and parameter space can be compressed to only three variables with a lift-augmented autoencoder while holding the essence of the original high-dimensional physics. Extreme aerodynamic flows can be compressed through machine learning into a low-dimensional manifold, which can enable real-time sparse reconstruction, dynamical modeling, and control of extremely unsteady gusty flows. The present findings offer support for the stable flight of next-generation small air vehicles in atmosphere conditions traditionally considered unflyable.
Species-specific differences in follicular antral sizes result from diffusion-based limitations on the thickness of the granulosa cell layer
Creators: name: Bächler, M.
name: Menshykau, D.
name: De Geyter, Ch.
name: Iber, D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Tissues and Organs (q-bio.TO)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: The size of mature oocytes is similar across mammalian species, yet the size of ovarian follicles increases with species size, with some ovarian follicles reaching diameters more than 1000-fold the size of the enclosed oocyte. Here we show that the different follicular sizes can be explained with diffusion-based limitations on the thickness of the hormone-secreting granulosa layer. By analysing published data on human follicular growth and granulosa cell expansion during follicular maturation we find that the 4-fold increase of the antral follicle diameter is entirely driven by an increase in the follicular fluid volume, while the thickness of the surrounding granulosa layer remains constant at about 45+/-10 mkm. Based on the measured kinetic constants, the model reveals that the observed fall in the gonadotropin concentration from peripheral blood circulation to the follicular antrum is a result of sequestration in the granulosa. The model further shows that as a result of sequestration, an increased granulosa thickness cannot substantially increase estradiol production but rather deprives the oocyte from gonadotropins. Larger animals (with a larger blood volume) require more estradiol as produced by the ovaries to downregulate FSH-secretion in the pituitary. Larger follicle diameters result in larger follicle surface areas for constant granulosa layer thickness. The reported increase in follicular surface area in larger species indeed correlates linearly both with species mass and with the predicted increase in estradiol output. In summary, we propose a structural role for the antrum in that it determines the volume of the granulosa layer and thus the level of estrogen production.
description: Mol Hum Repr 2013
Research on the Impact of Fiscal Subsidies on BYD's Sale of New Energy Vehicles - Take Shanghai as An Example
Creators: name: Weiyi Xu
Publisher: name: DR.KEN Institute of Academic Development and Promotion
Year: 2023
Subjects: Financial Subsidy
New Energy Vehicles
BYD
Sales

description: International Journal of Sociologies and Anthropologies Science Reviews, 3, 2, 181-186
Application of Graph Networks to background rejection in Imaging Air Cherenkov Telescopes
Creators: name: Glombitza, Jonas
name: Joshi, Vikas
name: Bruno, Benedetta
name: Funk, Stefan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Imaging Air Cherenkov Telescopes (IACTs) are essential to ground-based observations of gamma rays in the GeV to TeV regime. One particular challenge of ground-based gamma-ray astronomy is an effective rejection of the hadronic background. We propose a new deep-learning-based algorithm for classifying images measured using single or multiple Imaging Air Cherenkov Telescopes. We interpret the detected images as a collection of triggered sensors that can be represented by graphs and analyzed by graph convolutional networks. For images cleaned of the light from the night sky, this allows for an efficient algorithm design that bypasses the challenge of sparse images in deep learning approaches based on computer vision techniques such as convolutional neural networks. We investigate different graph network architectures and find a promising performance with improvements to previous machine-learning and deep-learning-based methods.
description: Published version, 22 pages, 8 figures
Fluid dynamics with saturated minijet initial conditions in ultrarelativistic heavy-ion collisions
Creators: name: Paatelainen, R.
name: Eskola, K. J.
name: Niemi, H.
name: Tuominen, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using next-to-leading order perturbative QCD and a conjecture of saturation to suppress the production of low-energy partons, we calculate the initial energy densities and formation times for the dissipative fluid dynamical evolution of the quark-gluon plasma produced in ultrarelativistic heavy-ion collisions. We identify the framework uncertainties and demonstrate the predictive power of the approach by a good global agreement with the measured centrality dependence of charged particle multiplicities, transverse momentum spectra and elliptic flow simultaneously for the Pb+Pb collisions at the LHC and Au+Au at RHIC. In particular, the shear viscosity in the different phases of QCD matter is constrained in this new framework simultaneously by all these data.
description: 5 pages, 8 figures
Analytical approach to higher-order correlation functions in U(1) symmetric systems
Creators: name: Lu, Zhi-Guang
name: Shang, Cheng
name: Wu, Ying
name: Lü, Xin-You
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive a compact analytical solution of the $n$th-order equal-time correlation functions by using scattering matrix ($S$ matrix) under a weak coherent state input. Our solution applies to any dissipative quantum system that respects the U(1) symmetry. We further extend our analytical solution into two categories depending on whether the input and output channels are identical. The first category provides a different path for studying cross-correlation and multiple-drive cases, while the second category is instrumental in studying waveguide quantum electrodynamics systems. Our analytical solution allows for easy investigation of the statistical properties of multiple photons even in complex systems. Furthermore, we have developed a user-friendly open-source library in Python known as the quantum correlation solver, and this tool provides a convenient means to study various dissipative quantum systems that satisfy the above-mentioned criteria. Our study enables using $S$ matrix to study the photonic correlation and advance the possibilities for exploring complex systems.
description: 22 pages, 8 figures, the QCS open-source library is available at http://github.com/ZhiGuangLu/qcs/
title: Проблемы развития цифровой экономики
Creators: name: Бережненко, Э.
name: Окомина, Е.
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2020

description: Вопрос развития цифровой экономики актуален практически для всех государств, поскольку цифровые технологии становятся неотъемлемой частью в повседневной жизни людей. Внедрение и применение цифровых устройств в экономической сфере приводит к изменениям в структуре многих областей и несет за
собой не только положительные последствия, но и приводит к возникновению некоторых проблем: отсутствие законодательной базы цифровой экономики, бюрократизация процесса внедрения цифровых технологий и избыточные требования к предпринимателям, критичность доступа к цифровым технологиям, проблемы
эффективного использования высококвалифицированных кадров, повышение квалификации работников, риск деградации навыков и психологическая зависимость, национальная безопасность и суверенитет, сложность финансирования.
Calculating Hyperfine Couplings in Large Ionic Crystals Containing Hundreds of QM Atoms: Subsystem DFT is the Key
Creators: name: Kevorkyants, Ruslan
name: Wang, Xiqiao
name: Close, David M.
name: Pavanello, Michele
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present an application of the linear scaling Frozen Density Embedding (FDE) formulation of subsystem DFT to the calculation of isotropic hyperfine coupling constants (hfccs) of atoms belonging to a guanine radical cation embedded in a guanine hydrochloride monohydrate crystal. The model systems considered range from an isolated guanine to a 15,000 atom QM/MM cluster where the QM region is comprised of 36 protonated guanine cations, 36 chlorine anions and 42 water molecules. Our calculations show that the embedding effects of the surrounding crystal cannot be reproduced neither by small model systems nor by a pure QM/MM procedure. Instead, a large QM region is needed to fully capture the complicated nature of the embedding effects in this system. The unprecedented system size for a relativistic all-electron isotropic hfccs calculation can be approached in this work because the local nature of the electronic structure of the organic crystals considered is fully captured by the FDE approach.
Abelian crossed modules and strict Picard categories
Creators: name: Quang, Nguyen Tien
name: Phung, Che Thi Kim
name: Tung, Ngo Sy
Publisher: name: arXiv
Year: 2013
Subjects: subject: Group Theory (math.GR)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 20K40, 20K35, 18D10

description: In this paper, we state the notion of morphisms in the category of abelian crossed modules and prove that this category is equivalent to the category of strict Picard categories and regular symmetric monoidal functors. The theory of obstructions for symmetric monoidal functors and symmetric cohomology groups are applied to show a treatment of the group extension problem of the type of an abelian crossed module.
description: 14 pages