cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Anomalous excitonic phase diagram in band-gap-tuned Ta2Ni(Se,S)5
Creators: name: Chen, Cheng
name: Tang, Weichen
name: Chen, Xiang
name: Kang, Zhibo
name: Ding, Shuhan
name: Scott, Kirsty
name: Wang, Siqi
name: Li, Zhenglu
name: Ruff, Jacob P. C.
name: Hashimoto, Makoto
name: Lu, Dong-Hui
name: Jozwiak, Chris
name: Bostwick, Aaron
name: Rotenberg, Eli
name: Neto, Eduardo H. da Silva
name: Birgeneau, Robert J.
name: Chen, Yulin
name: Louie, Steven G.
name: Wang, Yao
name: He, Yu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: During a band-gap-tuned semimetal-to-semiconductor transition, Coulomb attraction between electrons and holes can cause spontaneously formed excitons near the zero-band-gap point, or the Lifshitz transition point. This has become an important route to realize bulk excitonic insulators -- an insulating ground state distinct from single-particle band insulators. How this route manifests from weak to strong coupling is not clear. In this work, using angle-resolved photoemission spectroscopy (ARPES) and high-resolution synchrotron x-ray diffraction (XRD), we investigate the broken symmetry state across the semimetal-to-semiconductor transition in a leading bulk excitonic insulator candidate system Ta2Ni(Se,S)5. A broken symmetry phase is found to be continuously suppressed from the semimetal side to the semiconductor side, contradicting the anticipated maximal excitonic instability around the Lifshitz transition. Bolstered by first-principles and model calculations, we find strong interband electron-phonon coupling to play a crucial role in the enhanced symmetry breaking on the semimetal side of the phase diagram. Our results not only provide insight into the longstanding debate of the nature of intertwined orders in Ta2NiSe5, but also establish a basis for exploring band-gap-tuned structural and electronic instabilities in strongly coupled systems.
description: 27 pages, 4 + 9 figures
Исламски Фундаментализам И Заштита Државе: Упоредна Студија Случаја Северни Кавказ И Западни Балкан
Creators: name: Филиповић, Марко
Publisher: name: Zenodo
Year: 2016

description: Исламски фундаментализам представља сложен социјални феномен, који је у протеклих неколико деценија био предмет истраживања различитих научних дисциплина, при чему је углавном био сагледаван кроз призму Исламске револуције у Ирану 1979. године. До промене у перцепцији овог феномена дошло је 11. септембра 2001. године када је Ал Каида извела спектакуларан терористички напад на Њујорк и Вашингтон. Цео свет био је шокиран тим догађајем и питао се ко су ти људи, одакле су дошли и шта они желе? Читава бујица текстова појавила се тада у јавности, објашњавајући да тзв. исламски терористи представљају „нову пошаст“ која се појавила након пада комунизма. Истина је, међутим, да је исламски фундаментализам и раније представљао извесну претњу за поједине државе, али да на то многи нису обраћали пажњу. Историја његовог развоја заправо сеже до саме појаве исламске вере и њене пролиферације широм евроазијског масива, засноване на идеологији „светог рата“ и ширења граница калифата.
Kohn condition and exotic Newton-Hooke symmetry in the non-commutative Landau problem
Creators: name: Zhang, P-M.
name: Horvathy, P. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: $N$ "exotic" [alias non-commutative] particles with masses $m_a$, charges $e_a$ and non-commutative parameters $θ_a$, moving in a uniform magnetic field $B$, separate into center-of-mass and internal motions if Kohn's condition $e_a/m_a=\const$ is supplemented with $e_aθ_a=\const.$ Then the center-of-mass behaves as a single exotic particle carrying the total mass and charge of the system, $M$ and $e$, and a suitably defined non-commutative parameter $Θ$. For vanishing electric field off the critical case $eΘB\neq1$, the particles perform the usual cyclotronic motion with modified but equal frequency. The system is symmetric under suitable time-dependent translations which span a (4+2)- parameter centrally extended subgroup of the "exotic" [i.e., two-parameter centrally extended] Newton-Hooke group. In the critical case $B=B_c=(eΘ)^{-1}$ the system is frozen into a static "crystal" configuration. Adding a constant electric field, all particles perform, collectively, a cyclotronic motion combined with a drift perpendicular to the electric field when $eΘB\neq1$. For $B=B_c$ the cyclotronic motion is eliminated and all particles move, collectively, following the Hall law. Our time-dependent symmetries are reduced to the (2+1)-parameter Heisenberg group of centrally-extended translations.
description: 12 pages, no figures. A minor error and some typos corrected, one reference added
SLMIA-SR: Speaker-Level Membership Inference Attacks against Speaker Recognition Systems
Creators: name: Chen, Guangke
name: Zhang, Yedi
name: Song, Fu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: Multimedia (cs.MM)
subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Membership inference attacks allow adversaries to determine whether a particular example was contained in the model's training dataset. While previous works have confirmed the feasibility of such attacks in various applications, none has focused on speaker recognition (SR), a promising voice-based biometric recognition technique. In this work, we propose SLMIA-SR, the first membership inference attack tailored to SR. In contrast to conventional example-level attack, our attack features speaker-level membership inference, i.e., determining if any voices of a given speaker, either the same as or different from the given inference voices, have been involved in the training of a model. It is particularly useful and practical since the training and inference voices are usually distinct, and it is also meaningful considering the open-set nature of SR, namely, the recognition speakers were often not present in the training data. We utilize intra-similarity and inter-dissimilarity, two training objectives of SR, to characterize the differences between training and non-training speakers and quantify them with two groups of features driven by carefully-established feature engineering to mount the attack. To improve the generalizability of our attack, we propose a novel mixing ratio training strategy to train attack models. To enhance the attack performance, we introduce voice chunk splitting to cope with the limited number of inference voices and propose to train attack models dependent on the number of inference voices. Our attack is versatile and can work in both white-box and black-box scenarios. Additionally, we propose two novel techniques to reduce the number of black-box queries while maintaining the attack performance. Extensive experiments demonstrate the effectiveness of SLMIA-SR.
description: In Proceedings of the 31st Network and Distributed System Security (NDSS) Symposium, 2024
Amino acid derivatives of AD-2 exert their antitumor effects by affecting the cytoskeleton in HepG2 cellsd Item
Creators: name: Lin, Lizhen
Publisher: name: figshare
Year: 2023
Subjects: Cell development, proliferation and death

description: The protein expression levels of NSD2, MDM2, P-p53, Bcl-2, Bax, Caspase 3, Cleaved Caspase 3, and Caspase 8 were detected in 6b treated HepG2 cells. To further promote the apoptosis of HepG2 cells after 6b administration, we used flow cytometry to detect its apoptosis. ACTB is abnormally expressed in a number of malignancies, changing the cytoskeleton and influencing tumor formation. To further test this speculation, we assessed the major structural changes in the HepG2 cell line after treatment with compound 6b by staining actin filaments and nuclei with phalloidin/FITC and DAPI, respectively. Qualitative results from treatment with 5, 10, and 20 μM showed that compound 6b promoted nuclear and cytoplasmic changes.
Krein Regularization of λϕ^4
Creators: name: Forghan, Banafsheh
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the four-point function in λϕ^4 theory by using Krein regularization and compare our result, which is finite, with the usual result in λϕ^4 theory. The effective coupling constant (λ_μ) is also calculated in this method.
ASALARICHILIK XO'JALIGINING MUHIM JIHATLARI
Creators: name: Ubaydullayeva, Shohista
Publisher: name: Zenodo
Year: 2023

description: Asalarichilik tabiat olami va insoniyatning omon qolishi bilan chambarchas bog'liqbo'lganqadimiy san'atdir. Ular ishlab chiqaradigan asaldan tashqari, asalarilar meva, sabzavotlar va gullarning o'sishi uchun zarur bo'lgan muhim changlatuvchilardir. Biroq, ekologik muammolar va iqlim o'zgarishi bilan asalarilar oilamiz farovonligini ta'minlash har qachongidan ham muhimroqdir.
Generator coordinate method for nuclear octupole excitations: status and perspectives
Creators: name: Zhou, E. F.
name: Yao, J. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Strong octupole correlations have been observed in the low-lying states of atomic nuclei across various mass regions. In this review, we provide an overview of Beyond Mean-Field (BMF) studies of nuclear octupole collective motions with Generator Coordinate Method (GCM) in combination with quantum-number projections that are implemented to restore the broken symmetries in nuclear mean-field states. We highlight recent developments within this framework and their applications to excitation spectra and electromagnetic transition rates in octupole-shaped nuclei and hypernuclei. We discuss the novel phenomena of nucleon clustering in light nuclei. Additionally, we explore the phase transition from octupole vibrations to rotational motions as spin increases in heavy nuclei. Lastly, we examine the status and future prospects of studies on octupole deformation effects in nuclear Schiff moments. These studies, along with the upper limits of atomic Electric Dipole Moment (EDM), impose stringent constraints on beyond-standard-model time-reversal-violating nucleon-nucleon interactions.
description: 56 pages, 21 figures, an invited review for the journal Int. J. Mod. Phys. E
Социјално-Политички Аспекти Еколошког Тероризма
Creators: name: Јовић, Жељко М.
Publisher: name: Zenodo
Year: 2012

description: Након распада биполарног система и успостављања нове политичко-безбедносно-економске архитектуре у свету, на челу са САД и развијеним западним државама, савремено друштво и свет ушли су у нову етапу свог развоја.

Једно од кључних обележја ове етапе, безобзирна борба за преостале светске ресурсе, борба за светски политички и војни трон, поред осталих негативних последица, довела је и до енормног разарања природног окружења. Овај по природу деструктиван процес, са друге стране је условио појаву нових-старих идеологија, оличених у конкретним покретима, који су у борби за остварење сопствених визија (заштиту природе и живог света, права животиња...), у све већој мери почели да посежу за насилним средствима и методама, међу којима посебно место добија еколошки тероризам.
Detection of Calendar-Based Periodicities of Interval-Based Temporal Patterns
Creators: name: Mahanta, Anjana K.
name: Dutta, Mala
Publisher: name: arXiv
Year: 2012
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: We present a novel technique to identify calendar-based (annual, monthly and daily) periodicities of an interval-based temporal pattern. An interval-based temporal pattern is a pattern that occurs across a time-interval, then disappears for some time, again recurs across another time-interval and so on and so forth. Given the sequence of time-intervals in which an interval-based temporal pattern has occurred, we propose a method for identifying the extent to which the pattern is periodic with respect to a calendar cycle. In comparison to previous work, our method is asymptotically faster. We also show an interesting relationship between periodicities across different levels of any hierarchical timestamp (year/month/day, hour/minute/second etc.).
X-ray properties expected from AGN feedback in elliptical galaxies
Creators: name: Pellegrini, S.
name: Ciotti, L.
name: Ostriker, J. P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The ISM evolution of elliptical galaxies experiencing feedback from accretion onto a central black hole was studied recently with high-resolution 1D hydrodynamical simulations including radiative heating and pressure effects, a RIAF-like radiative efficiency, mechanical input from AGN winds, and accretion-driven starbursts. Here we focus on the observational properties of the models in the X-ray band (nuclear luminosity; hot ISM luminosity and temperature; temperature and brightness profiles during quiescence and during outbursts). The nuclear bursts last for ~10^7 yr, with a duty-cycle of a few X (10^-3-10^-2); the present epoch bolometric nuclear emission is very sub-Eddington. The ISM thermal luminosity \lx oscillates in phase with the nuclear one; this helps reproduce statistically the observed large \lx variation. In quiescence the temperature profile has a negative gradient; thanks to past outbursts, the brightness profile lacks the steep shape typical of inflowing models. Outbursts produce disturbances in these profiles. Most significantly, a hot bubble from shocked hot gas is inflated at the galaxy center; the bubble would be conical in shape, and show radio emission. The ISM resumes a smooth appearance on a time-scale of ~200 Myr; the duty-cycle of perturbances in the ISM is of the order of 5-10%. From the present analysis, additional input physics is important in the ISM-black hole coevolution, to fully account for the properties of real galaxies, as a confining external medium and a jet. The jet will reduce further the mass available for accretion (and then the Eddington ratio $l$), and may help, together with an external pressure, to produce flat or positive temperature gradient profiles (observed in high density environments). Alternatively, $l$ can be reduced if the switch from high to low radiative efficiency takes place at a larger $l$ than routinely assumed.
description: 40 pages, submitted to ApJ
Conferencia virtual Inducción a la propiedad intelectual: Las patentes
Creators: name: SANCHEZ, JORGE ALFREDO HILARIO
name: Rivas, Jorge Luis Hilario
Publisher: name: Zenodo
Year: 2023
Subjects: Patente
Invento
Propiedad Intelectual

description: Conferencia virtual Inducción a la propiedad intelectual: Las patentes 1) Entender que es propiedad intelectual: Las patente y tipos 2) Explicar los procedimientos de patentar en Perú 3) Entender la importancia de las patentes para las universidades en el Perú
Granular dilatancy and non-local fluidity of partially molten rock
Creators: name: Katz, Richard F.
name: Rudge, John F.
name: Hansen, Lars N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Partially molten rock is a densely packed, melt-saturated, granular medium, but it has seldom been considered in these terms. In this manuscript, we extend the continuum theory of partially molten rock to incorporate the physics of granular media. Our formulation includes dilatancy in a viscous constitutive law and introduces a non-local fluidity. We analyse the resulting poro-viscous--granular theory in terms of two modes of liquid--solid segregation that are observed in published torsion experiments: localisation of liquid into high-porosity sheets and radially inward liquid flow. We show that the newly incorporated granular physics brings the theory into agreement with experiments. We discuss these results in the context of grain-scale physics across the nominal jamming fraction at the high homologous temperatures relevant in geological systems.
description: 31 pages, 9 figures, 4 appendicies
An Asymptotic-Preserving all-speed scheme for the Euler and Navier-Stokes equations
Creators: name: Cordier, Floraine
name: Degond, Pierre
name: Kumbaro, Anela
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present an Asymptotic-Preserving 'all-speed' scheme for the simulation of compressible flows valid at all Mach-numbers ranging from very small to order unity. The scheme is based on a semi-implicit discretization which treats the acoustic part implicitly and the convective and diffusive parts explicitly. This discretization, which is the key to the Asymptotic-Preserving property, provides a consistent approximation of both the hyperbolic compressible regime and the elliptic incompressible regime. The divergence-free condition on the velocity in the incompressible regime is respected, and an the pressure is computed via an elliptic equation resulting from a suitable combination of the momentum and energy equations. The implicit treatment of the acoustic part allows the time-step to be independent of the Mach number. The scheme is conservative and applies to steady or unsteady flows and to general equations of state. One and Two-dimensional numerical results provide a validation of the Asymptotic-Preserving 'all-speed' properties.
Prompt photon and associated heavy quark production at hadron colliders with kt-factorization
Creators: name: Lipatov, A. V.
name: Malyshev, M. A.
name: Zotov, N. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the framework of the kt-factorization approach, the production of prompt photons in association with a heavy (charm or beauty) quarks at high energies is studied. The consideration is based on the O(αα_s^2) off-shell amplitudes of gluon-gluon fusion and quark-(anti)quark interaction subprocesses. The unintegrated parton densities in a proton are determined using the Kimber-Martin-Ryskin prescription. The analysis covers the total and differential cross sections and extends to specific angular correlations between the produced prompt photons and muons originating from the semileptonic decays of associated heavy quarks. Theoretical uncertainties of our evaluations are studied and comparison with the results of standard NLO pQCD calculations is performed. Our numerical predictions are compared with the recent experimental data taken by the D0 and CDF collaborations at the Tevatron. Finally, we extend our results to LHC energies.
description: 14 pages, 10 figures
Report On Legal, Economic, Social, Ethical And Political Issues
Creators: name: Donovan, Anna
name: Finn, Rachel
name: Oruc, Sertac
name: Werker, Claudia
name: Cunningham, Scott W.
name: Vega Gorgojo, Guillermo
name: Soylu, Ahmed
name: Roman, Dumitru
name: Akerkar, Rajendra
name: Garcia, Jose Maria
name: Lammerant, Hans
name: Galetta, Antonella
name: De Hert, Paul
name: Grumbach, Stephane
name: Faravelon, Aurelien
name: Ramirez, Alejandro
Publisher: name: Zenodo
Year: 2014

description: Report on legal, economic, social, ethical and political issues. Deliverable D2.1 BYTE Project.
Magnetogenesis in non-local models during inflation
Creators: name: Gorbar, E. V.
name: Gorkavenko, T. V.
name: Gorkavenko, V. M.
name: Teslyk, O. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The generation of magnetic fields during inflation in an electromagnetic model with a non-local form factor in Maxwell`s action is studied. The equations of motion for the electromagnetic field are derived and solved. It is found that the conformal symmetry breaking due to the non-local form factor does not lead to the generation of magnetic fields during inflation in the absence of interaction with the inflaton field. If such a coupling takes place, then the presence of the form factor inhibits the generation of primordial magnetic fields compared to the case where the non-local form factor is absent.
description: 7 pages
Управљање Системом Интегрисане Заштите У Функцији Отклањања Последица Терористичких Аката
Creators: name: Гаџић, Јасмина
Publisher: name: Zenodo
Year: 2016

description: У литератури и академским расправама изражена је сагласност да ће тероризам у свим својим облицима у догледној будућности бити озбиљна претња и један од највећих безбедносних проблема. Тероризам је лостао специфичан, софистицирани ризик и политичко-стратешки концепт који изражава тенденцију ескалације ка новим генеричким и комбинованим проблемима. Оваква његова природа и динамика намеће потребу за заједничким деловањем обавештајно-безбедносног система, а захтева и усклађено кривично законодавство, блиску сарадњу судских органа у његовом сузбијању, заједничко деловање војних и полицијских снага, као и јединствен став целокупне заједнице према носиоцима тероризма.
Supersymmetric Extension of the Minimal Dark Matter Model
Creators: name: Chang, Xue
name: Liu, Chun
name: Ma, Feng-Cai
name: Yang, Shuo
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The minimal dark matter model is given a supersymmetric extension. A super SU(2)L quintuplet is introduced with its fermionic neutral component still being the dark matter, the dark matter particle mass is about 19.7 GeV. Mass splitting among the quintplet due to supersymmetry particles is found to be negligibly small compared to the electroweak corrections. Other properties of this supersymmetry model are studied, it has the solutions to the PAMELA and Fermi-LAT anomaly, the predictions in higher energies need further experimental data to verify.
description: 14 pages, 7 figures, accepted for publication in Chinese Physics C, typos corrected
Open Access To Data
Creators: name: Donovan, Anna
name: Finn, Rachel
name: Wadhwa, Kush
name: Bigagli, Lorenzo
name: Vega Gorgojo, Guillermo
name: Skjæveland, Martin Georg
Publisher: name: Zenodo
Year: 2014

description: Open Access to Data. Deliverable D2.3 BYTE Project.
The deconfinement phase transition in the Hamiltonian approach to Yang--Mills theory in Coulomb gauge
Creators: name: Heffner, Jan
name: Reinhardt, Hugo
name: Campagnari, Davide R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The deconfinement phase transition of SU(2) Yang--Mills theory is investigated in the Hamiltonian approach in Coulomb gauge assuming a quasi-particle picture for the grand canonical gluon ensemble. The thermal equilibrium state is found by minimizing the free energy with respect to the quasi-gluon energy. Above the deconfinement phase transition the ghost form factor remains infrared divergent but its infrared exponent is approximately halved, while the gluon energy, being infrared divergent in the confined phase, becomes infrared finite in the deconfined phase. For the effective gluon mass we find a critical exponent of 0.37. Using the lattice results for the gluon propagator to fix the scale, the deconfinement transition temperature is obtained in the range of 275 to 290 MeV.
description: 20 pages, 13 figures, accepted for publication by Phys. Rev. D
Quantum tunneling from Schwarzschild black hole in non-commutative gauge theory of gravity
Creators: name: Touati, Abdellah
name: Zaim, Slimane
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this letter, we present the first study of Hawking radiation as a tunneling process within the framework of non-commutative (NC) gauge theory of gravity. First, we reconstruct the non-commutative Schwarzschild black hole (NC SBH) within the gauge theory of gravity, employing the Seiberg-Witten (SW) map and the star product. Then, we compute the emission spectrum of outgoing massless particles using the quantum tunneling mechanism. In the first scenario, we calculate the tunneling rate of massless particles crossing the event horizon of the NC SBH with lower frequencies. Our results reveal pure thermal radiation. Notably, we find that the Hawking temperature remains consistent in both the classical thermodynamics and the quantum tunneling approach, suggesting equivalence between these two approaches in NC spacetime. However, in the case of massless particle emission with higher frequencies, we account for energy conservation resulting in the tunneling rate to deviate from pure thermal radiation. This tunneling rate remains consistent with an underlying unitary quantum theory. We establish a relationship between this deviation and the change in the black hole entropy, revealing a logarithmic correction to the entropy within this geometry. Furthermore, we demonstrate that non-commutativity enhances the correlations between two successively emitted particles. Additionally, we determine the NC density number of particle emission and conclude by discussing the implications of our findings.
description: 9 pages, 5 figures
The Riemann-Hilbert approach to obtain critical asymptotics for Hamiltonian perturbations of hyperbolic and elliptic systems
Creators: name: Claeys, Tom
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35Q53, 33E17, 35Q15

description: The present paper gives an overview of the recent developments in the description of critical behavior for Hamiltonian perturbations of hyperbolic and elliptic systems of partial differential equations. It was conjectured that this behavior can be described in terms of distinguished Painlevé transcendents, which are universal in the sense that they are, to some extent, independent of the equation and the initial data. We will consider several examples of well-known integrable equations that are expected to show this type of Painlevé behavior near critical points. The Riemann-Hilbert method is a useful tool to obtain rigorous results for such equations. We will explain the main lines of this method and we will discuss the universality conjecture from a Riemann-Hilbert point of view.
description: review paper, 22 pages, 4 figures
Effect of positron-atom interactions on the annihilation gamma spectra of molecules
Creators: name: Green, D. G.
name: Saha, S.
name: Wang, F.
name: Gribakin, G. F.
name: Surko, C. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Calculations of gamma spectra for positron annihilation on a selection of molecules, including methane and its fluoro-substitutes, ethane, propane, butane and benzene are presented. The annihilation gamma spectra characterise the momentum distribution of the electron-positron pair at the instant of annihilation. The contribution to the gamma spectra from individual molecular orbitals is obtained from electron momentum densities calculated using modern computational quantum chemistry density functional theory tools. The calculation, in its simplest form, effectively treats the low-energy (thermalised, room-temperature) positron as a plane wave and gives annihilation gamma spectra that are about 40% broader than experiment, although the main chemical trends are reproduced. We show that this effective "narrowing" of the experimental spectra is due to the action of the molecular potential on the positron, chiefly, due to the positron repulsion from the nuclei. It leads to a suppression of the contribution of small positron-nuclear separations where the electron momentum is large. To investigate the effect of the nuclear repulsion, as well as that of short-range electron-positron and positron-molecule correlations, a linear combination of atomic orbital description of the molecular orbitals is employed. It facilitates the incorporation of correction factors which can be calculated from atomic many-body theory and account for the repulsion and correlations. Their inclusion in the calculation gives gamma spectrum linewidths that are in much better agreement with experiment. Furthermore, it is shown that the effective distortion of the electron momentum density, when it is observed through positron annihilation gamma spectra, can be approximated by a relatively simple scaling factor.
description: 26 pages, 12 figures
Comparison of Gd addition effect on the superconducting properties of FeSe0.5Te0.5 bulks under ambient and high-pressure conditions
Creators: name: Manasa, Manasa
name: Azam, Mohammad
name: Zajarniuk, Tatiana
name: Diduszko, Ryszard
name: Mizeracki, Jan
name: Cetner, Tomasz
name: Morawski, Andrzej
name: Wisniewski, Andrzej
name: Singh, Shiv J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We have prepared a series of (FeSe0.5Te0.5 + xGd) bulk samples, with x = 0, 0.03, 0.05, 0.07, 0.1 and 0.2, through the convenient solid-state reaction method at ambient pressure (CSP). High gas pressure and high-temperature synthesis methods (HP-HTS) are also applied to grow the parent compound (x = 0) and 5-wt% of Gd-added bulks. Structural, microstructural, transport and magnetic characterizations have been performed on these samples in order to draw the final conclusion. Our analysis results that the HP-HTS applied for the parent compound enhances the transition temperature (Tc) and the critical current density (Jc) with the improved sample density and intergrain connections. The lattice parameter c is increased with Gd additions, suggesting a small amount of Gd enters the tetragonal lattice of FeSe0.5Te0.5 and the Gd interstitial sites are along the c-axis. A systematic decrease of the onset transition temperature Tc is observed with Gd additions, however, the calculated Jc of these Gd-added samples is almost the same as that of the parent compound prepared by CSP. It specifies that there is no improvement of the grain connections or pinning properties due to these rare earth additions. However, Gd-added FeSe0.5Te0.5 bulks prepared by HP-HTS have revealed a slightly improved critical current density due to improved grain connections and sample density but have a lower transition temperature than that of the parent compounds.
description: 33 pages, 9 figures, 3 tables
Coronagraphic Low Order Wave Front Sensor : post-processing sensitivity enhancer for high performance coronagraphs
Creators: name: Vogt, Frédéric P. A.
name: Martinache, Frantz
name: Guyon, Olivier
name: Yoshikawa, Takashi
name: Yokochi, Kaito
name: Garrel, Vincent
name: Matsuo, Taro
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Detection and characterization of exoplanets by direct imaging requires a coronagraph designed to deliver high contrast at small angular separation. To achieve this, an accurate control of low order aberrations, such as pointing and focus errors, is essential to optimize coronagraphic rejection and avoid the possible confusion between exoplanet light and coronagraphic leaks in the science image. Simulations and laboratory prototyping have shown that a Coronagraphic Low Order Wave-Front Sensor (CLOWFS), using a single defocused image of a reflective focal plane ring, can be used to control tip-tilt to an accuracy of 10^{-3} lambda/D. This paper demonstrates that the data acquired by CLOWFS can also be used in post-processing to calibrate residual coronagraphic leaks from the science image. Using both the CLOWFS camera and the science camera in the system, we quantify the accuracy of the method and its ability to successfully remove light due to low order errors from the science image. We also report the implementation and performance of the CLOWFS on the Subaru Coronagraphic Extreme AO (SCExAO) system and its expected on-sky performance. In the laboratory, with a level of disturbance similar to what is encountered in a post Adaptive Optics beam, CLOWFS post-processing has achieved speckle calibration to 1/300 of the raw speckle level. This is about 40 times better than could be done with an idealized PSF subtraction that does not rely on CLOWFS.
description: 10 pages, 7 figures, accepted for publication in PASP
Experimental Observation of Transitions of Different Pulse Solutions of Ginzburg-Landau Equation in a Mode-Locked Fiber Laser
Creators: name: Peng, Junsong
name: Zhan, Li
name: Gu, Zhaochang
name: Luo, Shouyu
name: Shen, Qishun
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Transitions between different kinds of soliton solutions of Ginzburg-Landau equation (GLE) have been studied experimentally in a mode-locked fiber laser. It is demonstrated that the different kinds of solitons corresponding to different solutions of GLE can be generated in a single mode-locked laser. Dispersion-managed solitons (DM), all-normal-dispersion solitons (ANDi) and similaritons can be emitted respectively depending on the parameter of the intensity of the light field and the birefringence effect. The three nonlinear waves show different features especially the spectrum shapes and dynamics accompanying with pump power scaling. Such phenomenon reveals the properties of GLE, which is not only scientifically interesting but also valuable to practical applications of mode-locked fiber lasers.
description: 5 pages, 9 figures
Block2: a comprehensive open source framework to develop and apply state-of-the-art DMRG algorithms in electronic structure and beyond
Creators: name: Zhai, Huanchen
name: Larsson, Henrik R.
name: Lee, Seunghoon
name: Cui, Zhi-Hao
name: Zhu, Tianyu
name: Sun, Chong
name: Peng, Linqing
name: Peng, Ruojing
name: Liao, Ke
name: Tölle, Johannes
name: Yang, Junjie
name: Li, Shuoxue
name: Chan, Garnet Kin-Lic
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Block2 is an open source framework to implement and perform density matrix renormalization group and matrix product state algorithms. Out-of-the-box it supports the eigenstate, time-dependent, response, and finite-temperature algorithms. In addition, it carries special optimizations for ab initio electronic structure Hamiltonians and implements many quantum chemistry extensions to the density matrix renormalization group, such as dynamical correlation theories. The code is designed with an emphasis on flexibility, extensibility, and efficiency, and to support integration with external numerical packages. Here we explain the design principles and currently supported features and present numerical examples in a range of applications.
description: 20 pages, 8 figures
Supersymmetry constraints on the R^4 multiplet in type IIB on T^2
Creators: name: Basu, Anirban
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a class of eight derivative interactions in the effective action of type IIB string theory compactified on T^2. These 1/2 BPS interactions have moduli dependent couplings. We impose the constraints of supersymmetry to show that each of these couplings satisfy a first order differential equation on moduli space which relate it to other couplings in the same supermuliplet. These equations can be iterated to give second order differential equations for the various couplings. The couplings which only depend on the SO(2)\SL(2,R) moduli satisfy Laplace equation on moduli space, and are given by modular forms of SL(2,Z). On the other hand, the ones that only depend on the SO(3)\SL(3,R) moduli satisfy Poisson equation on moduli space, where the source terms are given by other couplings in the same supermultiplet. The couplings of the interactions which are charged under SU(2) are not automorphic forms of SL(3,Z). Among the interactions we consider, the R^4 coupling depends on all the moduli.
description: 89 pages, LaTeX
Simulation of High Conversion Efficiency and Open-circuit Voltages Of α-si/poly-silicon Solar Cell
Creators: name: Chen, AQing
name: Shao, QingYi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The P+ α-Si /N+ polycrystalline solar cell is molded using the AMPS-1D device simulator to explore the new high efficiency thin film poly-silicon solar cell. In order to analyze the characteristics of this device and the thickness of N+ poly-silicon, we consider the impurity concentration in the N+ poly-silicon layer and the work function of transparent conductive oxide (TCO) in front contact in the calculation. The thickness of N+ poly-silicon has little impact on the device when the thickness varies from 20 μm to 300 μm. The effects of impurity concentration in polycrystalline are analyzed. The conclusion is drawn that the open-circuit voltage (Voc) of P+ α-Si /N+ polycrystalline solar cell is very high, reaching 752 mV, and the conversion efficiency reaches 9.44%. Therefore, based on the above optimum parameters the study on the device formed by P+ α-Si/N+ poly-silicon is significant in exploring the high efficiency poly-silicon solar cell.
description: 8 pages 6figures, 1 tables
Risk When Buying Food by E-Commerce: What Factors Influence the Consumer's Perception of Risk?
Creators: name: Monge, Alexis Villalobos
name: Monge, Alexis Villalobos
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agricultural and Food Policy
subject: Demand and Price Analysis
subject: Financial Economics
subject: Marketing
subject: FOS: Economics and business
subject: Research Methods/ Statistical Methods
subject: Risk and Uncertainty
subject: Risk
subject: electronic commerce
subject: structural equations
subject: food

description: Risk is a key aspect to be considered when analysing economic decisions. This investigation is one of the first to review the risk that a person perceives when making the decision to buy food using electronic commerce as their purchase channel. It was possible to determine that convenience associated with ease of use and hedonic motivations represent the impulses with the greatest influence on this perception. A virtual food shopping experiment was conducted for 30 weeks, and 223 responses were obtained from shoppers with different demographic characteristics. The results were modelled through variance analysis where statistically significant differences were found (p-value <0,05) for exogenous and endogenous variables. It was determined, among other findings, that the perception of risk in the virtual purchase of food is lower compared to other purchase channels such as supermarkets and farmer’s markets.
Посебност Кривичног Поступка За Организовани Криминал, Тероризам И Корупцију
Creators: name: Лукић, Татјана
Publisher: name: Zenodo
Year: 2016

description: Националне и светске статистике указују да криминал нагло расте у свим земљама, и то како у оним које се налазе на путу изграђивања нових демократских односа или су од недавно демократске, тако и у оним где демократски процеси нису ни почели или су угушени. Криминал данас показује успон, или у најбољем случају стагнацију и у добро организованим државама са ефикасним и правно усклађеним функционисањем појединих служби и институција. Овом негатнвном друштвеном појавом су погођени како држава, тако и друштвени и приватни интереси грађана. Осим великог обима, криминал данас карактерише висок степен организованости и на унутрашњем, и на међународном плану и поседује следеће особине: пораст рецидивизма, професионализма и специјализације, злоупотребу техничких достигнућа и појаву нових криминалних облика, тајност и разноврсност организовања и деловања, интернационализацију, огромна финансијска средства и то са више независних финансијских система, ослабљену ефикасност органа откривања, чему знатно доприноси и пораст материјалних трошкова неопходних за сузбијање криминала.1 Капитал стечен криминалом, као и онај који служи за његову активизацију се енормно увећава, а са њим и могућност криминалног организовања и испољавања. Опасност од данашњег високософистицираног криминала за правни поредак не произилази само из криминалних радњи, већ из могућности да се посредством прања новца и корупције утиче на одлуке у привреди и политици.
Fabrication of versatile targeted lipopolymersomes for improved camptothecin efficacy against colon adenocarcinoma in vitro and in vivo
Creators: name: Zahiri, Mahsa
name: Taghdisi, Seyed Mohammad
name: Abnous, Khalil
name: Ramezani, Mohammad
name: Alibolandi, Mona
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer

description: Hybrid vesicular systems (lipopolymersomes) are promising platforms for minimizing the liposomes and polymersomes disadvantages in terms of chemotherapeutic transportation. In this regard, lipopolymersome has been designed to integrate the advantage of both polymersomes and liposomes to enable better structural integrity of the bilayer after encapsulation of hydrophobic drugs while maintaining the soft nature of liposomes, superior serum stability, and high encapsulation efficiency of cargos in the bilayer segment. In the present study, we reported preparation and characterization of five camptothecin (CPT)-loaded lipopolymersomal formulations composed of poly (ethylene glycol)–poly (lactic acid) (PEG-PLA) and dipalmitoylphosphatidylcholine (DPPC) at different molar ratios using film rehydration method. Afterward, the preferred formulation was tagged with AS1411 DNA aptamer in order to evaluate the therapeutic index using nucleolin-positive colon cancer cell lines (HT29 and C26). The obtained data indicated that the prepared CPT-loaded lipopolymersome at a PEG-PLA: DPPC ratio of 75:25 exhibited superior stability and high loading capacity compared to other systems. Moreover, high cytotoxicity of the aptamer-targeted lipopolymersome and increased tumor accumulation were observed in comparison with non-targeted one. The designed polymer-rich lipopolymersomal platform offers bright future for the development of potent nanomedicine against cancer.
The complexity of conservative valued CSPs
Creators: name: Kolmogorov, Vladimir
name: Zivny, Stanislav
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: We study the complexity of valued constraint satisfaction problems (VCSP). A problem from VCSP is characterised by a \emph{constraint language}, a fixed set of cost functions over a finite domain. An instance of the problem is specified by a sum of cost functions from the language and the goal is to minimise the sum. We consider the case of languages containing all possible unary cost functions. In the case of languages consisting of only $\{0,\infty\}$-valued cost functions (i.e. relations), such languages have been called \emph{conservative} and studied by Bulatov [LICS'03] and recently by Barto [LICS'11]. Since we study valued languages, we call a language conservative if it contains all finite-valued unary cost functions. The complexity of conservative valued languages has been studied by Cohen et al. [AIJ'06] for languages over Boolean domains, by Deineko et al. [JACM'08] for $\{0,1\}$-valued languages (a.k.a Max-CSP), and by Takhanov [STACS'10] for $\{0,\infty\}$-valued languages containing all finite-valued unary cost functions (a.k.a. Min-Cost-Hom). We prove a Schaefer-like dichotomy theorem for conservative valued languages: if all cost functions in the language satisfy a certain condition (specified by a complementary combination of \emph{STP and MJN multimorphisms}), then any instance can be solved in polytime (via a new algorithm developed in this paper), otherwise the language is NP-hard. This is the \emph{first} complete complexity classification of \emph{general-valued constraint languages} over non-Boolean domains. This generalises previous results by Takhanov [STACS'10] and (a subset of results) by Cohen et al. [AIJ'06] and Deineko et al. [JACM'08]. Moreover, our results do not rely on any computer-assisted search as in Deineko et al. [JACM'08], and provide a powerful tool for proving hardness of finite- and general-valued languages.
description: 38 pages. Full version of the paper that will appear in SODA 12
Asymptotic properties of the sequential empirical ROC, PPV and NPV curves under case-control sampling
Creators: name: Koopmeiners, Joseph S.
name: Feng, Ziding
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: The receiver operating characteristic (ROC) curve, the positive predictive value (PPV) curve and the negative predictive value (NPV) curve are three measures of performance for a continuous diagnostic biomarker. The ROC, PPV and NPV curves are often estimated empirically to avoid assumptions about the distributional form of the biomarkers. Recently, there has been a push to incorporate group sequential methods into the design of diagnostic biomarker studies. A thorough understanding of the asymptotic properties of the sequential empirical ROC, PPV and NPV curves will provide more flexibility when designing group sequential diagnostic biomarker studies. In this paper, we derive asymptotic theory for the sequential empirical ROC, PPV and NPV curves under case-control sampling using sequential empirical process theory. We show that the sequential empirical ROC, PPV and NPV curves converge to the sum of independent Kiefer processes and show how these results can be used to derive asymptotic results for summaries of the sequential empirical ROC, PPV and NPV curves.
description: Published in at http://dx.doi.org/10.1214/11-AOS937 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Origins of dihydrogen binding to metal-inserted porphyrins: electric polarization and Kubas interaction
Creators: name: Ryou, Junga
name: Kim, Gunn
name: Hong, Suklyun
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using density functional theory calculations, we have investigated the interactions between hydrogen molecules and metalloporphyrins. A metal atom such as Ca or Ti is introduced for incorporation in the central N$_4$ cavity. Within local density approximation (generalized gradient approximation), we find that the average binding energy of H$_2$ to the Ca atom is about 0.25 (0.1) eV/H$_2$ up to four H$_2$ molecules, whereas that to the Ti atom is about 0.6 (0.3) eV per H$_2$ up to two H$_2$. Our analysis of orbital hybridization between the inserted metal atom and molecular hydrogen shows that H$_2$ binds weakly to Ca-porphyrin through a weak electric polarization in dihydrogen, but is strongly hybridized with Ti-porphyrin through the Kubas interaction. The presence of $d$ orbitals in Ti may explain the difference in the interaction types.
description: 12 pages, 5 figures. Selected as a front cover of the Journal of Chemical Physics