cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Method for processing a small sample of fuzzy results of an orthogonalized passive experiment
Creators: name: Demin, Dmitriy
name: T. Katkova
Publisher: name: figshare
Year: 2020
Subjects: subject: 99902 Engineering Instrumentation
subject: FOS: Other engineering and technologies

description: The solution of many problems of assessing and predicting the state of complex systems of different nature, operating in a multifactorial environment, is reduced to finding a relationship that connects the values of the monitored parameters of the environment with the value of some resulting parameter – the response characterizing the state of the system. As a mathematical description of such systems, the Kolmogorov-Gabor regression polynomial is often used, the estimates of the coefficients of which are determined by the least squares methods. However, in the case of a small sample of initial data, practical difficulties arise in the implementation of this approach. They are associated with an unsatisfactory ratio between the number of estimated parameters N = 2m and the number of experiments performed N. The problems arising in this case are solved either by increasing the number of experiments, which is not always possible, or by a reasonable decrease in the number of estimated parameters. One of the promising ways to reduce the dimension of the vector of estimates of the coefficients of the Kolmogorov-Gabor polynomial is the artificial orthogonalization of the results of a passive experiment. But the direct use of this technology in real conditions is difficult due to the uncertainty regarding the numerical values of the experimental results. A variant of solving this problem, described in this study, consists in applying the method proposed in it for estimating the coefficients of the regression equation in conditions of fuzzy initial data using orthogonalization of a passive experiment. The essence of the method is that for the regions adjacent to the vertices of the hypercube of the scaled factor space, a local description of the response function behavior is constructed. This is done using a nominal linear in parameters and factors in the form of regression, the parameters of which are determined by the least squares method, and instead of the output variable, the membership function of fuzzy measurement results in Gaussian form is used. For cases where the number of experimental points in some subdomain adjacent to its vertex turns out to be small, as well as with a different number of them in each of the subdomains, a procedure for forming a truncated replica-like orthogonal subdesign is proposed. A feature of the solutions formed in this case is that they are obtained by removing a rather rigid assumption about the equality of the measurement errors of the response function at all observation points. Due to this, the proposed method makes it possible to solve the problem associated with the estimation of the coefficients of the Kolmogorov-Gabor regression polynomial in the case of a fuzzy description of the output variable based on a small sample of experimental data.
Field-dependent quantum gauge transformation
Creators: name: Upadhyay, Sudhaker
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper we generalize the quantum gauge transformation of Maxwell theory obtained through gaugeon formalism. The generalization is made by making the bosonic transformation parameter field-dependent. The Jacobian of vacuum functional under field-dependent quantum gauge transformation is calculated explicitly. We show that the quantum gauge transformation with a particular choice of field-dependent parameter connects the gaugeon actions of Maxwell theory in two different gauges. We establish the result by connecting two well-known gauges, namely, Lorentz gauge and axial gauge.
description: 7 pages, No figure, Journal version
Production of the Common - Ethnography of Social Hacking and Creative Activist Practice in Europe. Or how to reinvent the wheel, and why?
Creators: name: Blumer, Stéphane
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 440107
subject: Social and cultural anthropology
classificationCode: 470204
subject: Cultural and creative industries

description: In this paper, the emergence of social hacking, or creative activism, is explored in relation to its impact on society. Informed by a year of participant observation within a collective of artists and social activists, the investigation examines the context in which these collectives operate, explores their social techniques, and discusses the notion of production of the commons. The paper begins by acknowledging the widespread impact of hacking on social spaces beyond the digital realm. This resulted in significant political implications, as one can observe the widespread of collectives of artists, designers, programmers, and social activists coming together all over Europe in an effort to mutualise their resources and productions. It is clear that there is a growing interest in the hackers/makers movement by official public institutions like the European Commission and the increasing fundings from private companies. This challenges the traditional operational models of groups with limited or non-existent budgets. This is followed by an exploration of the techniques used by a European collective that draws inspiration from the daily life of Benedictine monks as well as self-management technologies and social engineering. The paper discusses the methods used by the collective, such as the creation of temporary autonomous zones (Bey, 1998), open source innovation, and the use of blockchain technology. The paper then turns to the notion of the production of the commons (Ostrom, 1991, 1994, 2011) which refers to the process by which individuals and groups come together to create and manage shared resources, in a variety of fields such as community gardens, open source software, and peer-to-peer networks. It is argued that social hacking can be seen as a way of reclaiming the commons from the control of corporations and governments. The paper also touches on the relationship between creativity and the market economy. The development of information and communication technology through the internet has led to the radical democratisation of the production and visibility of the arts. This has also led to the emergence of new forms of endogamous cultural communities and tensions between individualistic and pluralistic objectives in the creative process. In conclusion, the paper highlights the potential of social hacking to challenge dominant power structures, to reclaim the commons, and to promote collective action. It is suggested that social hacking can provide a new model for creative activism that is rooted in collaborative and democratic practices, and that has the potential to create lasting social change.
Coleophora gardesanella Toll, 1953 (Lepidoptera: Coleophoridae) – nowy gatunek w faunie Polski
Creators: name: Grzegorz Banasiak, ul. Miodowa 6, 96-100 Skierniewice, Polska, e-mail: bangr@ld.on et.pl
Publisher: name: Zenodo
Year: 2024
Subjects: Lepidoptera, Coleophoridae, Coleophora gardesanella, faunistics, Poland

description: Coleophora gardesanella Toll, 1953 (Lepidoptera: Coleophoridae) – a new species to the Polish fauna.Coleophora gardesanella Toll, 1953 (Lepidoptera: Coleophoridae) – is reported as a new species to the Polish fauna. A brief description and some data on ecology are provided. Imago, male and female genitals are illustrated.
Effect of coupling with strain in multiferroics on phase diagrams and elastic anomalies
Creators: name: Charnaya, E. V.
name: Pirozerskii, A. L.
name: Gabbasova, K. R.
name: Bugaev, A. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The Landau theory was applied to treat the phase diagrams for a multiferroic with two second order phase transitions taking into account the coupling of the primary order parameters with strain. Two order parameters are coupled biquadratically which corresponds to the magnetoelectric materials. The coupling with strain is assumed to be linear in strain and quadratic in order parameters. Three ordered phases are discussed. Analytic relationships were obtained for the phase transition temperatures and for elastic modulus changes through the phase transitions. Strong influence of the coupling with strain on the phase diagrams was shown.
description: 9 pages, 4 figures; preprint of manuscript submitted to Physica B
Probing the Shapes of Thermonuclear Explosions through Early to Late-Time Polarimetry
Creators: name: Yang, Yi
Publisher: name: Zenodo
Year: 2023

description: Thanks to the rapid detections of supernovae by modern high-cadence wide-field transient surveys, the geometry properties of supernovae can be probed at unprecedented phases early as the first few days after the explosion. The geometry through the outer to inner layers can be inferred observationally through tomographic dissection, for example, with time-resolved spectropolarimetry that is sensitive to three-dimensional geometrical and chemical structures. I will provide a brief overview of the lessons we learned from the polarimetric observations of thermonuclear supernovae, as well as the main challenges and potential future efforts that need to be considered to better understand thermonuclear explosions.
Pattern formation in systems with multiple delayed feedbacks
Creators: name: Yanchuk, Serhiy
name: Giacomelli, Giovanni
Publisher: name: arXiv
Year: 2014
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Mathematical Physics (math-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Chaotic Dynamics (nlin.CD)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Dynamical systems with complex delayed interactions arise commonly when propagation times are significant, yielding complicated oscillatory instabilities. In this Letter, we introduce a class of systems with multiple, hierarchically long time delays, and using a suitable space-time representation we uncover features otherwise hidden in their temporal dynamics. The behaviour in the case of two delays is shown to ''encode'' two-dimensional spiral defects and defects turbulence. A multiple scale analysis sets the equivalence to a complex Ginzburg-Landau equation, and a novel criterium for the attainment of the long-delay regime is introduced. We also demonstrate this phenomenon for a semiconductor laser with two delayed optical feedbacks.
ZAMONAVIY PEDAGOGIKADA KEYS-STADI TA'LIM TEXNOLOGIYASINI QO'LLASH USULLARI
Creators: name: Turg'unboyeva, Shahnoza
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada pedagogikaning jahon hamjamiyatida o’rin egallab kelayotgan texnologiyalaridan biri keys-stadi ta’lim texnologiyalarini dars jarayoniga samarali targ’ib etish masalalari aks etadi.
A new spin on black hole hair
Creators: name: Herdeiro, Carlos A. R.
name: Radu, Eugen
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that scalar hair can be added to rotating, vacuum black holes of general relativity. These hairy black holes (HBHs) clarify a lingering question concerning gravitational solitons: if a black hole can be added at the centre of a boson star, as it typically can for other solitons. We argue that it can, but only if it is spinning. The existence of such HBHs is related to the Kerr superradiant instability triggered by a massive scalar field. This connection leads to the following conjecture: a (hairless) black hole which is afflicted by the superradiant instability of a given field must allow hairy generalizations with that field.
description: 9 pages, 1 figure, Essay written for the Gravity Research Foundation 2014 Awards for Essays on Gravitation and selected for Honorable Mention
EDOCR: Energy Density On-demand Cluster Routing in Wireless Sensor Networks
Creators: name: Thippeswamy, B M
name: Reshma, S
name: Shaila, K
name: Venugopal, K R
name: Iyengar, S S
name: Patnaik, L M
Publisher: name: arXiv
Year: 2014
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Energy management is one of the critical parameters in Wireless Sensor Networks. In this paper we attempt for a solution to balance the energy usage for maximizing the network lifetime, increase the packet delivery ratio and throughput. Our proposed algorithm is based on Energy Density of the clusters in Wireless Sensor Networks. The cluster head is selected using two step method and on-demand routing approach to calculate the balanced energy shortest path from source to sink. This unique approach maintains the balanced energy utilization among all nodes by selecting the different cluster heads dynamically. Our simulation results have compared with one of the plain routing scheme (EBRP) and cluster based routing (TSCHS), which shows the significant improvements in minimizing the delay and energy utilization and maximizing the network lifetime and throughput with respect to these works.
description: 18 pages,7 Figures
Pierwsze stwierdzenie Acrobasis fallouella (Ragonot, 1871) (Lepidoptera: Pyralidae) w Polsce
Creators: name: Adam Larysz, Dział Przyrody, Muzeum Górnośląskie w Bytomu, pl. Jana III Sobieskiego 2, 41-902 Bytom, Polska, e-mail: a.larysz@muzeum.bytom.pl
name: Grzegorz Chowaniec, ul. Estetyczna 7/77, 43-100 Tychy, Polska, e-mail: grzecho49@onet.pl
Publisher: name: Zenodo
Year: 2024
Subjects: Acrobasis fallouella, Lepidoptera, Pyralidae, Phycitinae, new record, Upper Silesia, Poland

description: First record of Acrobasis fallouella (Ragonot, 1871) (Lepidoptera: Pyralidae) in Poland.One male of Acrobasis fallouella (Ragonot, 1871) (Lepidoptera: Pyralidae) was collected in Upper Silesia in Mikołów-Mokre, Śląskie Voivodeship. This is the first record of this species in Poland.
Power spectral density estimation for wireless fluctuation enhanced gas sensor nodes
Creators: name: Mingesz, Robert
name: Vadai, Gergely
name: Gingl, Zoltan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Fluctuation enhanced sensing (FES) is a promising method to improve the selectivity and sensitivity of semiconductor and nanotechnology gas sensors. Most measurement setups include high cost signal conditioning and data acquisition units as well as intensive data processing. However, there are attempts to reduce the cost and energy consumption of the hardware and to find efficient processing methods for low cost wireless solutions. In our paper we propose highly efficient signal processing methods to analyze the power spectral density of fluctuations. These support the development of ultra-low-power intelligent fluctuation enhanced wireless sensor nodes while several further applications are also possible.
An ecological systems model of employee experience in industry-led autism employment programmes
Creators: name: Bury, Simon
name: Zulla, Rosslynn
name: Spoor, Jennifer
name: Flower, Rebecca
name: Nicholas, David B.
name: Hedley, Darren
Publisher: name: La Trobe
Year: 2024
Subjects: classificationCode: 5201
subject: Applied and developmental psychology
classificationCode: 350502
subject: Employment equity and diversity

description: Industry-led employment programmes have emerged to transition autistic people into employment and meet industry labour needs. However, theoretical research is limited in this area, often failing to appreciate the influence of the broader employment ecosystem. In this study, we interviewed 33 autistic employees (n = 29 males, Mage = 29.00 years) from two industry-led employment programmes regarding their experience of the programme’s supports, relationships and impact. We used qualitative content analysis to identify five themes: (1) working involves multiple job tasks that evolve as the employment context changes; (2) workplace relations are diverse and shaped by the type of work and the work environment; (3) workplace needs evolve as autistic individuals navigate the work environment; (4) developing a professional identity in the workplace through mastery and integration; and (5) recommendations for the development of supportive workplace environments for autistic individuals. We describe the way that factors within (e.g. training) and outside the two employment programmes changed and interacted over time to contribute to the participant’s work experience and professional identity. Building on ecological systems theory, our unique contribution to the literature is a new model capturing individual and workplace factors that contribute to the work experience of autistic people who participate in industry employment programmes.
Exceptional points and Bloch oscillations in non-Hermitian lattices with unidirectional hopping
Creators: name: Longhi, Stefano
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The spectral and transport properties of a non-Hermitian tight-binding lattice with unidirectional hopping are theoretically investigated in three different geometrical settings. It is shown that, while for the infinitely-extended (open) and for the ring lattice geometries the spectrum is complex, lattice truncation makes the spectrum real. However, an exceptional point of order equal to the number of lattice sites emerges. When a homogeneous dc force is applied to the lattice, in all cases an equally-spaced real Wannier-Stark ladder spectrum is obtained, corresponding to periodic oscillatory dynamics in real space. Possible physical realizations of non-Hermitian lattices with unidirectional hopping are briefly discussed.
description: 6 pages, 3 figure, to appear in EPL
KONSTITUTSIYA– FAROVON HAYOTIMIZ POYDEVORI
Creators: name: Turg'unboyeva, Sh. B.
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada bosh qomusimiz–Konstitutsiyamizning yaratilish tarixi, bir necha Konstitutsiyaviy islohotlar, umume’tirof etilgan normalar hamda   ularning bugungi kundagi ahamiyati haqida fikr va mulohazalar aks ettiriladi.
Mass angular momentum and charge inequalities for black holes in Einstein-Maxwell-axion-dilaton gravity
Creators: name: Rogatko, Marek
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Mass angular momentum and charge inequalities for axisymmetric maximal time-symmetric initial data invariant under an action of U(1) group, in Einstein-Maxwell-axion-dilaton gravity being the low-energy limit of the heterotic string theory, is established. We assume that data set with two asymptotically flat regions is given on smooth simply connected manifold. We also pay attention to the area momentum charge inequalities for a closed orintabler two-dimensional spacelike surface embedded in the spacetime of the considered theory.
description: 11 pages, RevTex, to be published in Phys.Rev.D15
Policy Brief WP6 – Migration Aspirations and Development Interventions.
Creators: name: Kuschminder, Katie
Publisher: name: Zenodo
Year: 2023
Subjects: migration aspirations
development interventions
migration and development
migration Mali
migration Ethiopia
migration Lebanon
migration Turkey

description: This policy brief highlights the results of WP6 in the ADMIGOV project focusing on development interventions and refugees' and other migrants' migration aspirations. The primary questions guiding WP6 were: Under what conditions are migration decision-making processes influenced by development interventions? To what extent do different migration decision-making factors shape migration decisions? The selected countries for analysis were chosen as large refugee hosting environments (Ethiopia, Lebanon, Turkey), being core transit countries towards the European Union (EU) (Mali), and having regular migration of nationals (Ethiopia and Mali). The results show that there is a diversity of access to development assistance across the study countries, that refugees and other migrants are the most likely to plan to migrate, and that the study countries have faced compounding crises' where COVID-19 was not the most formidable crisis facing the individual countries. Three policy implications are highlighted. First, refugees seek to migrate onward due to poor conditions, reflecting that there is a pressing need for further daily assistance and long-term solutions for refugees. Second, very few respondents aspired to return, however, respondents did fear involuntary return, demonstrating that the right to non-refoulement must be protected. Third, the ability of development funding to reduce migration aspirations to the EU is uncertain while development needs continue to be very high.
description: This is the policy brief of AdMiGovwork package 6, more information https://admigov.eu
Near-Infrared Polarimetry of the Edge-On Galaxy NGC891
Creators: name: Montgomery, Jordan D.
name: Clemens, Dan P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The edge-on galaxy NGC 891 was probed using near-infrared (NIR) imaging polarimetry in the H-band (1.6 um) with the Mimir instrument on the 1.8 m Perkins Telescope. Polarization was detected with signal-to-noise ratio greater than three out to a surface brightness of 18.8 mag arcsec^-2. The unweighted average and dispersion in polarization percentage (P) across the full disk were 0.7% and 0.3%, respectively, and the same quantities for polarization position angle (P.A.) were 12 deg and 19 deg, respectively. At least one polarization null point, where P falls nearly to zero, was detected in the NE disk but not the SW disk. Several other asymmetries in P between the northern and southern disk were found and may be related to spiral structure. Profiles of P and P.A. along the minor axis of NGC 891 suggest a transition from magnetic (B) field tracing dichroic polarization near the disk mid-plane to scattering dominated polarization off the disk mid-plane. A comparison between NIR P.A. and radio (3.6 cm) synchrotron polarization P.A. values revealed similar B-field orientations in the central-northeast region, which suggests that the hot plasma and cold, star-forming interstellar medium may share a common B-field. Disk-perpendicular polarizations previously seen at optical wavelengths are likely caused by scattered light from the bright galaxy center and are unlikely to be tracing poloidal B-fields in the outer disk.
description: Accepted for publication in The Astrophysical Journal (20140313); 16 pages, 8 figures
Interplane resistivity of underdoped single crystals (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$, $0 \leq x<0.34$
Creators: name: Tanatar, M. A.
name: Straszheim, W. E.
name: Kim, Hyunsoo
name: Murphy, J.
name: Spyrison, N.
name: Blomberg, E. C.
name: Cho, K.
name: Reid, J. -Ph.
name: Shen, Bing
name: Taillefer, Louis
name: Wen, Hai-Hu
name: Prozorov, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Temperature-dependent inter-plane resistivity, $ρ_c(T)$, was measured in hole-doped iron-arsenide superconductor (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$ over a doping range from parent compound to optimal doping $T_c\approx 38~K$, $0\leq x \leq 0.34$. Measurements were undertaken on high-quality single crystals grown from FeAs flux. The coupled magnetic/structural transition at $T_{SM}$ leads to clear accelerated decrease of $ρ_c(T)$ on cooling in samples with $T_c
Coupling between octahedral rotations and local polar displacements in WO3/ReO3 superlattices
Creators: name: Schick, Joseph T.
name: Jiang, Lai
name: Saldana-Greco, Diomedes
name: Rappe, Andrew M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We model short-period superlattices of WO$_3$ and ReO$_3$ with first-principles calculations. In fully-relaxed superlattices, we observe that octahedral tilts about an axis in the planes of the superlattices do not propagate from one material, despite the presence of the corner-shared oxygen atoms. However, we find that octahedral rotation is enhanced within WO$_3$ layers in cases in which strain couples with native antiferroelectric displacements of tungsten within their octahedral cages. Resulting structures remain antiferroelectric with low net global polarization. Thermodynamic analysis reveals that superlattices with sufficiently thick ReO$_3$ layers, the absolute number being three or more layers and the Re fraction $\geq 50\%$, tend to be more stable than the separated material phases and also show enhanced octahedral rotations in the WO$_3$ layers.
description: 7 pages, 7 figures
On the definition of a moist-air potential vorticity
Creators: name: Marquet, Pascal
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: A new potential vorticity is derived by using a specific entropy formulation expressed in terms of a moist-air entropy potential temperature. The new formulation is compared with Ertel's version and with others based on virtual and equivalent potential temperatures. The new potential vorticity is subject to conservative properties ensured by the Second Law applied to the moist-air material derivatives. It is shown that the upper tropospheric and stratospheric (dry) structures are nearly the same as those obtained with Ertel's component. Moreover, new structures are observed in the low troposphere, with negative values associated with moist frontal regions. The negative values are observed in the frontal regions where slantwise convection instabilities may take place, but they are smaller than those observed with the equivalent potential vorticity. The main purpose of the article is to diagnose the behaviour of the new potential vorticity from numerical output generated by the ARPEGE NWP model, with the help of isobaric charts and vertical cross-sections. Two inversion methods are suggested. The first method could be based on the invertibility principle verified by the virtual potential vorticity, with a possibility to control and modify separately potential vorticity components in the (dry) upper and (moist) lower atmospheric levels. The other method may consist of an inversion process directly applied to the new moist-air entropy potential vorticity, because the negative values and the solenoidal term are smaller than those observed with equivalent potential vorticity, as shown by numerical evaluations.
description: Submitted to the Q. J. R. Meteorol. Soc. in August 2012. Accepted in April 2013. Early view on the QJRMS site http://onlinelibrary.wiley.com/doi/10.1002/qj.2182/abstract. 24 pages, 10 color figures. V2: add the arXiv links of Marquet (2011), Geleyn and Marquet (2012) and Marquet and Geleyn (2013)
SSHOC, Repositories, CoreTrustSeal & FAIR
Creators: name: L'Hours, Hervé
Publisher: name: Zenodo
Year: 2020

description: A presentation from 'Realising the European Open Science Cloud - Towards a FAIR Research Data Landscape for the Social Sciences, Humanities and Beyond' conference covering the SSHOC project repository support process as it relates to the CoreTrustSeal and the FAIR data principles, CoreTrustSeal and FAIR. Part of the session 'FAIR Data Implementation: Extending the portfolio of EOSC services with FAIR data repositories'.
Microscopic origin of pressure-induced isosymmetric transitions in fluoromanganate cryolites
Creators: name: Charles, Nenian
name: Rondinelli, James M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using first-principles density functional theory calculations, we investigate the hydrostatic pressure-induced reorientation of the Mn--F Jahn-Teller bond axis in the fluoride cryolite Na$_3$MnF$_6$. We find a first-order isosymmetric transition occurs between crystallographically equivalent monoclinic structures at approximately 2.15 GPa, consistent with earlier experimental studies. Analogous calculations for isostructural $3d^0$ Na$_3$ScF$_6$ show no evidence of a transition up to 6.82 GPa. Mode crystallography analyses of the pressure-dependent structures in the vicinity of the transition reveals a clear evolution of the Jahn-Teller bond distortions in cooperation with an asymmetrical stretching of the equatorial fluorine atoms in the MnF$_6$ octahedral units. We identify a change in orbital occupancy of the $e_g$ manifold in the $3d^4$ Jahn-Teller active Mn(III) to be responsible for the transition, which stabilizes one monoclinic $P2_1/n$ variant over the other.
description: 10 pages, 9 figures
The Non-Signalling theorem in generalizations of Bell's theorem
Creators: name: Walleczek, Jan
name: Groessing, Gerhard
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Does "epistemic non-signalling" ensure the peaceful coexistence of special relativity and quantum nonlocality? The possibility of an affirmative answer is of great importance to deterministic approaches to quantum mechanics given recent developments towards generalizations of Bell's theorem. By generalizations of Bell's theorem we here mean efforts that seek to demonstrate the impossibility of any deterministic theories to obey the predictions of Bell's theorem, including even nonlocal hidden-variables theories such as de Broglie-Bohm theory. The present work offers arguments showing why such efforts towards generalization may fall short of their stated goal. In particular, we reject the use of the non-signalling theorem as an argument against the logical possibility of deterministic quantum theories. We proceed by presenting an entirely informal treatment of key physical and metaphysical assumptions, and of their interrelationship, in attempts seeking to generalize Bell's theorem on the basis of an ontic, foundational interpretation of the non-signalling theorem. We here argue that the non-signalling theorem must instead be viewed as an epistemic, phenomenological, or operational theorem i.e. one that refers exclusively to what epistemic agents can, or rather cannot, do. That is, we emphasize that the non-signalling theorem is a theorem about the operational inability of epistemic agents, e.g. human observers, to signal information. A major reason in favor of our conclusion is that any definition of signalling or of non-signalling invariably requires a reference to epistemic agents, and what these agents can actually measure and report; otherwise, the non-signalling theorem would equal a general "no-influence" theorem.
description: 8 pages, 2 figures, 1 table; talk presented at the 2nd international symposium on "Emergent Quantum Mechanics" (Vienna, Austria, 3-6 October, 2013), (http://www.emqm13.org/) To be published in J. Phys.: Conf. Ser. (2014)
Oscillator Models of the Solar Cycle and the Waldmeier Effect
Creators: name: Nagy, M.
name: Petrovay, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the behaviour of the van der Pol oscillator when either its damping parameter $μ$ or its nonlinearity parameter $ξ$ is subject to additive or multiplicative random noise. Assuming various power law exponents for the relation between the oscillating variable and the sunspot number, for each case we map the parameter plane defined by the amplitude and the correlation time of the perturbation and mark the parameter regime where the sunspot number displays solar-like behaviour. Solar-like behaviour is defined here as a good correlation between the rise rate and cycle amplitude {\it and} the lack of a good correlation between the decay rate and amplitude, together with significant ($\ga 10$\,%) r.m.s. variation in cycle lengths and cycle amplitudes. It is found that perturbing $μ$ alone the perturbed van der Pol oscillator does not show solar-like behaviour. When the perturbed variable is $ξ$, solar-like behaviour is displayed for perturbations with a correlation time of about 3--4 years and significant amplitude. Such studies may provide useful constraints on solar dynamo models and their parameters.
description: 4 pages, 2 figures
Interaction between a soliton and a double layer in a traveling magnetic field system
Creators: name: Sudhan, Kumar Harihara
Publisher: name: Zenodo
Year: 2020
Subjects: soliton
double layer

description: The uploaded materials were presented at APS DPP 2020. We derive the interaction term between a plasma soliton and a double layer by manipulating a technique called the Reductive Perturbation method. The system studied here is a traveling magnetic field system initially proposed for thruster applications.
Body Image among Vietnamese Men who Have Sex with Men (MSM): Dynamics, Complexities and The Influence on Sex and Relationships
Creators: name: An, Thanh Ly
Publisher: name: La Trobe
Year: 2024
Subjects: classificationCode: 440507
subject: Studies of men and masculinities
classificationCode: 440506
subject: Sexualities
classificationCode: 520502
subject: Gender psychology
classificationCode: 520503
subject: Personality and individual differences
classificationCode: 441008
subject: Sociology of culture
classificationCode: 520304
subject: Health psychology

description: Submitted in total fulfillment of the requirements for the degree of Doctor of Philosophy to the School of Psychology and Public Health, La Trobe University, Victoria, Australia.
Phase-merging Enhanced Harmonic Generation Free-electron Laser
Creators: name: Feng, Chao
name: Deng, Haixiao
name: Wang, Dong
name: Zhao, Zhentang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Together with one of its variants, the recently proposed phase-merging enhanced harmonic generation (PEHG) free-electron lasers (FELs) have been systematically studied in this paper. Different form the standard-HGHG, a transverse gradient undulator is employed for introducing a phase-merging effect into the transversely dispersed electron beam in PEHG. The analytical theory of the phase-merging effect and the physical mechanism behind the phenomenon were presented. Using a representative and realistic set of beam parameters, intensive start-to-end simulations for soft x-ray FEL generation were given to illustrate the performance of PEHG. Moreover, some practical issues that may affect the performance of PEHG were also discussed.
description: 13 pages, 12 figures
Mean-field behavior as a result of noisy local dynamics in self-organized criticality: Neuroscience implications
Creators: name: Moosavi, S. Amin
name: Montakhab, Afshin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Motivated by recent experiments in neuroscience which indicate that neuronal avalanches exhibit scale invariant behavior similar to self-organized critical systems, we study the role of noisy (non-conservative) local dynamics on the critical behavior of a sandpile model which can be taken to mimic the dynamics of neuronal avalanches. We find that despite the fact that noise breaks the strict local conservation required to attain criticality, our system exhibit true criticality for a wide range of noise in various dimensions, given that conservation is respected \textit{on the average}. Although the system remains critical, exhibiting finite-size scaling, the value of critical exponents change depending on the intensity of local noise. Interestingly, for sufficiently strong noise level, the critical exponents approach and saturate at their mean-field values, consistent with empirical measurements of neuronal avalanches. This is confirmed for both two and three dimensional models. However, addition of noise does not affect the exponents at the upper critical dimension ($D=4$). In addition to extensive finite-size scaling analysis of our systems, we also employ a useful time-series analysis method in order to establish true criticality of noisy systems. Finally, we discuss the implications of our work in neuroscience as well as some implications for general phenomena of criticality in non-equilibrium systems.
description: 8 pages, 7 figures. To appear in Phys. Rev. E
Injection molding and characterization of microtextures on polycarbonate using laser textured inserts
Creators: name: Sáez-Comet, C.
name: Fontdecaba, E.
name: Cuadrado, N.
name: Puiggali, Jordi
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Neuroscience
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences

description: The purpose of this paper is to demonstrate the easy manufacturing and quick characterization of several microtextured functional surfaces on two transparent thermoplastics of general interest for several industrial sectors. Microtextured polymeric surfaces with special optical, tribological and easy-cleaning properties were manufactured via isothermal injection-molding using laser-microtextured steel mold inserts. For that purpose, conventional injection molding of two chosen amorphous transparent polymers (polycarbonate, PC, and polymethyl methacrylate, PMMA) utilizing laser-microtextured steel inserts was carried out, and a detailed morphological and functional characterization of the injected specimens was conducted later on. We also report on the suitable process conditions for the injection molding of these specimens using design of experiment (DOE) techniques. The analysis of the degree of replication (DR%) on the injected samples shows that mold temperature and injection speed are the most relevant parameters to obtain a successful replication and confirm the viability of conventional injection molding as a processing technique to obtain microtextured functional surfaces in amorphous transparent thermoplastics. The success of the procedure is further checked by the confirmation of the obtained surface functionalities by various standard and self-developed methods.
Maximal integral point sets in affine planes over finite fields
Creators: name: Kiermaier, Michael
name: Kurz, Sascha
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 51E2, 05B25

description: Motivated by integral point sets in the Euclidean plane, we consider integral point sets in affine planes over finite fields. An integral point set is a set of points in the affine plane $\mathbb{F}_q^2$ over a finite field $\mathbb{F}_q$, where the formally defined squared Euclidean distance of every pair of points is a square in $\mathbb{F}_q$. It turns out that integral point sets over $\mathbb{F}_q$ can also be characterized as affine point sets determining certain prescribed directions, which gives a relation to the work of Blokhuis. Furthermore, in one important sub-case integral point sets can be restated as cliques in Paley graphs of square order. In this article we give new results on the automorphisms of integral point sets and classify maximal integral point sets over $\mathbb{F}_q$ for $q\leq 47$. Furthermore, we give two series of maximal integral point sets and prove their maximality.
description: 23 pages, 3 figures, 2 tables. arXiv admin note: text overlap with arXiv:0804.1285 -> This paper has been withdrawn by the author and added as a new version of arXiv:0804.1285, which it actually is - only the title has slightly changed due to a referee request
2022- Application of nanotechnology for optimization of bleaching efficiency of edible oils.pdf
Creators: name: Almoselhy, Rania I.M.
Publisher: name: figshare
Year: 2023
Subjects: Food technology

description: Nanotechnology is the recent science dealing with materials at the nano-sized (smaller than 100nm). Nanotechnology showed its potential significance in almost all industrial sectors. In the current paper, the potency of nanotechnology was affirmed in the food science and technology, especially in the manufacturing of edible oils which passes many procedures, from which is the most important step of bleaching edible oils to remove colorants and contaminants and enhance the quality parameters of these vital components of the human diet. Bleaching process made use of bleaching earth powder which was converted into the nano-sized and then utilized in the bleaching process of edible oils. Results showed the powerful bleaching efficiency optimized by applying nanotechnology in converting the bleaching earth powder to the nano-sized through mechanical milling processes which resulted in smaller size in nanoscale with more efficient surface area available for adsorption of colorants and contaminants of the edible oils resulting in pure edible oils of superior quality and safety.
The Mdot - M* relation of pre-main sequence stars: a consequence of X-ray driven disc evolution
Creators: name: Ercolano, B.
name: Mayr, D.
name: Owen, J. E.
name: Rosotti, G.
name: Manara, C. F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analyse current measurements of accretion rates onto pre-main sequence stars as a function of stellar mass, and conclude that the steep dependance of accretion rates on stellar mass is real and not driven by selection/detection threshold, as has been previously feared. These conclusions are reached by means of statistical tests including a survival analysis which can account for upper limits. The power-law slope of the Mdot-M* relation is found to be in the range of 1.6-1.9 for young stars with masses lower than 1 Msun. The measured slopes and distributions can be easily reproduced by means of a simple disc model which includes viscous accretion and X-ray photoevaporation. We conclude that the Mdot-M* relation in pre-main sequence stars bears the signature of disc dispersal by X-ray photoevaporation, suggesting that the relation is a straight- forward consequence of disc physics rather than an imprint of initial conditions.
description: 9 pages, 6 Figures, 2 Tables, accepted by MNRAS
Body Image Perceptions and Visualization of Vietnamese MSM
Creators: name: An, Thanh Ly
name: Waling, Andrea
name: Bourne, Adam
Publisher: name: La Trobe
Year: 2024
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences

description: Research on body image among men who have sex with men (MSM) has predominantly been approached with the assumption that all MSM conform to a culturally preferred body, and have a high risk of body image concerns leading to risky behaviors and negative health outcomes. Scholars have called for a more nuanced understanding of how MSM engage with their body images. In response, we conducted 30 semi-structured interviews with Vietnamese MSM to explore their perceptions and feelings of their bodies, including their current body, idealized body, and sexually desired body. Inductive thematic analysis was utilized. The findings highlight the diversity and complexity in Vietnamese MSM’s perceptions and feelings about their bodies, which Western measurements of body image and body dissatisfaction might not fully capture. The participants also acknowledge the pressure of physical appearance; however, they do not always conform to the dominant body ideals and have a high risk of body dissatisfaction. We conclude with a call for reframing the approach to gay and bisexual men’s body image to understand better how they navigate complex pressures and make sense of their body image instead of assuming they are at risk of body dissatisfaction.
Internal stresses and breakup of rigid isostatic aggregates in homogeneous and isotropic turbulence
Creators: name: De Bona, Jeremias
name: Lanotte, Alessandra S.
name: Vanni, Marco
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: By characterising the hydrodynamic stresses generated by statistically homogeneous and isotropic turbulence in rigid aggregates, we estimate theoretically the rate of turbulent breakup of colloidal aggregates and the size distribution of the formed fragments. The adopted method combines Direct Numerical Simulation of the turbulent field with a Discrete Element Method based on Stokesian dynamics. In this way, not only the mechanics of the aggregate is modelled in detail, but the internal stresses are evaluated while the aggregate is moving in the turbulent flow. We examine doublets and cluster-cluster isostatic aggregates, where the failure of a single contact leads to the rupture of the aggregate and breakup occurs when the tensile force at a contact exceeds the cohesive strength of the bond. Due to the different role of the internal stresses, the functional relationship between breakup frequency and turbulence dissipation rate is very different in the two cases. In the limit of very small and very large values, the frequency of breakup scales exponentially with the turbulence dissipation rate for doublets, while it follows a power law for cluster-cluster aggregates. For the case of large isostatic aggregates it is confirmed that the proper scaling length for maximum stress and breakup is the radius of gyration. The cumulative fragment distribution function is nearly independent of the mean turbulence dissipation rate and can be approximated by the sum of a small erosive component and a term that is quadratic with respect to fragment size.
description: 31 pages, 19 figures