cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Chirality dependence of the absorption cross-section of carbon nanotubes
Creators: name: Vialla, Fabien
name: Roquelet, Cyrielle
name: Langlois, Benjamin
name: Delport, Géraud
name: Santos, Silvia Morim
name: Deleporte, Emmanuelle
name: Roussignol, Philippe
name: Delalande, Claude
name: Voisin, Christophe
name: Lauret, Jean-Sébastien
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The variation of the optical absorption of carbon nanotubes with their geometry has been a long standing question at the heart of both metrological and applicative issues, in particular because optical spectroscopy is one of the primary tools for the assessment of the chiral species abundance of samples. Here, we tackle the chirality dependence of the optical absorption with an original method involving ultra-efficient energy transfer in porphyrin/nanotube compounds that allows uniform photo-excitation of all chiral species. We measure the absolute absorption cross-section of a wide range of semiconducting nanotubes at their S22 transition and show that it varies by up to a factor of 2.2 with the chiral angle, with type I nanotubes showing a larger absorption. In contrast, the luminescence quantum yield remains almost constant.
Schrödinger's cat meets Occam's razor
Creators: name: Gill, Richard D.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss V.P. Belavkin's (2007) approach to the Schrödinger cat problem and show its close relation to ideas based on superselection and interaction with the environment developed by N.P. Landsman (1995). The purpose of the paper is to explain these ideas in the most simple possible context, namely: discrete time and separable Hilbert spaces, in order to make them accessible to those coming from the philosophy of science and not too happy with idiosyncratic notation and terminology and sophisticated mathematical tools. Conventional elementary mathematical descriptions of quantum mechanics take "measurement" to be a primitive concept. Paradoxes arise when we choose to consider smaller or larger systems as measurement devices in their own right, by making different and apparently arbitrary choices of location of the "Heisenberg cut". Various quantum interpretations have different resolutions of the paradox. In Belavkin's approach, the classical world around us does really exist, and it evolves stochastically and dynamically in time according to probability laws following from successive applications of the Born law. It is a collapse theory, and necessarily it is non-local. The quantum/classical distinction is determined by the arrow of time. The underlying unitary evolution of the wave-function of the universe enables the designation of a collection of beables which grows as time evolves, and which therefore can be assigned random, classical trajectories. In a slogan: the past is particles, the future is a wave. We, living in the now, are located on the cutting edge between past and future.
description: Published version: 11 pages, has now appeared in "Entropy"
title:  Lifelong learning e diritto allo studio ai tempi del Covid-19: una ricostruzione dell’esperienza delle 150 ore tra strumenti didattici digitali e riflessione storica
Creators: name: Ridolfi, Maurizio
name: A. Doro, Raffaello
Publisher: name: RomaTrE-Press
Year: 2021

description: La pandemia Covid-19 ha comportato conseguenze e trasformazioni prefigurando scenari inediti sul piano economico, sociale e personale, determinando anche nel campo della ricerca l’urgenza di esplorarne le ricadute. Il volume dà quindi conto delle indagini svolte e in corso, sin dai primi giorni del lockdown, dai docenti e dai collaboratori del Dipartimento di Scienze della Formazione dell’Università Roma Tre, toccando i temi più diversi: dalla didattica a distanza, all’università e nei diversi ordini di scuola, al futuro dei servizi di orientamento, dal lavoro socio-educativo nelle varie tipologie di servizi all’impatto della pandemia sulle comunità, dalle narrazioni ai linguaggi artistici a contrasto di quest’emergenza non solo sanitaria. Si sono così esplorate le diverse educazioni possibili, riassegnando centralità ai processi formativi e al benessere delle persone, provando a tratteggiare nuovi paradigmi e prospettive.
description: Partendo dall’esperienza maturata durante la pandemia da Covid-19 l’articolo riflette sulle possibilità didattiche e di ricerca dello studio dell’esperienza delle 150 ore in Italia. Nata negli anni Settanta come diritto acquisito dallo Statuto dei lavoratori (1970), l’istituto delle 150 ore rappresentò una grande occasione di educazione e di formazione in età adulta nell’Italia repubblicana. Questa vicenda può essere inserita all’interno della storia dell’educazione permanente in Italia con particolare riferimento alle esperienze di didattica a distanza promossa dai media audiovisivi, in particolare attraverso la televisione a partire dagli anni Sessanta. Da un’altra prospettiva la conquista delle 150 ore si inserisce all’interno di una forma di educazione alla cittadinanza repubblicana, utilizzata da milioni di cittadini di varie categorie sociali come un’occasione di acquisire una formazione più completa ed esercitare il proprio ruolo attivo. Lo studio delle 150 ore ha così permesso uno sguardo più ampio sulla storia dell’educazione permanente e sulle modalità di educazione alla cittadinanza nella storia dell’Italia repubblicana, permettendo di sviluppare buone pratiche di Public History.
description: La Ricerca dipartimentale ai tempi del COVID-19
Microlocal Properties of Bisingular Operators
Creators: name: Borsero, M.
name: Schulz, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35S05, 35A18, 35A27

description: We study the microlocal properties of bisingular operators, a class of operators on the product of two compact manifolds. We define a wave front set for such operators, and analyse its properties. We compare our wave front set with the $SG$ wave front set, a global wave front set which shares with it formal similarities.
description: 22 pages, 1 figure, 2 tables. Corrected typos, expanded section 3
A comparison between active strain and active stress in transversely isotropic hyperelastic materials
Creators: name: Giantesio, Giulia
name: Musesti, Alessandro
name: Riccobelli, Davide
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Active materials are media for which deformations can occur in absence of loads, given an external stimulus. Two approaches to the modeling of such materials are mainly used in literature, both based on the introduction of a new tensor: an additive stress $\mathsf{P}_\text{act}$ in the active stress case and a multiplicative strain $\mathsf{F}_a$ in the active strain one. Aim of this paper is the comparison between the two approaches on simple shears. Considering an incompressible and transversely isotropic material, we design constitutive relations for $\mathsf{P}_\text{act}$ and $\mathsf{F}_a$ so that they produce the same results for a uniaxial deformation along the symmetry axis. We then study the two approaches in the case of a simple shear deformation. In a hyperelastic setting, we show that the two approaches produce different stress components along a simple shear, unless some necessary conditions on the strain energy density are fulfilled. However, such conditions are very restrictive and rule out the usual elastic strain energy functionals. Active stress and active strain therefore produce different results in shear, even if they both fit uniaxial data. Our results show that experimental data on the stress-stretch response on uniaxial deformations are not enough to establish which activation approach can capture better the mechanics of active materials. We conclude that other types of deformations, beyond the uniaxial one, should be taken into consideration in the modeling of such materials.
Abe Cabinet Migration Reforms: Cautious Liberalization?
Creators: name: Shipilova Maria Andreevna
Publisher: name: Russian Japanology Review
Year: 2021
Subjects: migration policy
migration legislation
labor migrants
illegal migration
Abenomics

description: Japan is a developed country which, however, is facing an acute problem of population aging and demographic decline, including that of the number of working-age population, due to a combination of low fertility and high life expectancy. Most countries solve the problem of labor shortage by actively attracting labor migrants to the country. However, Japan – one of the most mono-ethnic countries in the world – is known for its strict migration legislation. The migration balance in 2018 amounted to a little more than 160,000 people, despite the fact that, in order to stabilize the population, the influx of people into the country should be about 500,000 annually. This situation is largely caused by limited migration attractiveness of Japan, where migrants still often face violations of their rights, difficulties in renting housing, employment and in everyday life due to the language barrier, complexity of administrative procedures, and socio-cultural characteristics of Japanese society. Given the demographic trends, the use of labor migration to fill the shortage of labor in Japan seems to be not only reasonable, but also an uncontested option. That is why the migration policy of Japan became one of the most important issues with regard to the well-being of the Land of the Rising Sun during the premiership of S. Abe, who decided to gradually move to liberalize migration legislation. Since 2012, initiatives and goals of Abe Cabinet in the field of immigration control, in fact, affected all categories of migrants – highly qualified specialists, students, low-skilled workers, medium-skilled workers, and illegal immigrants. The article will examine what measures were taken during Abe’s premiership to attract foreigners and how the liberalization of migration legislation correlated with the growth strategy of Japan, Abenomics.
Shape transitions in a soft incompressible sphere with residual stresses
Creators: name: Riccobelli, Davide
name: Ciarletta, Pasquale
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences
subject: 74B20, 74B15, 74G60, 74G15

description: Residual stresses may appear in elastic bodies due to the formation of misfits in the micro-structure, driven by plastic deformations, thermal or growth processes. They are especially widespread in living matter, resulting from the dynamic remodelling processes aiming at optimizing the overall structural response to environmental physical forces. From a mechanical viewpoint, residual stresses are classically modelled through the introduction of a virtual incompatible state that collects the local relaxed states around each material point. In this work, we instead employ an alternative approach based on a strain energy function that constitutively depends only on the deformation gradient and the residual stress tensor. In particular, our objective is to study the morphological stability of an incompressible sphere, made of a neo-Hookean material and subjected to given distributions of residual stresses. Firstly, we perform a linear stability analysis on the pre-stressed solid sphere using the method of incremental deformations. The marginal stability conditions are given as a function of a control parameter, being the dimensionless variable that represents the characteristic intensity of the residual stresses. Secondly, we perform finite element simulations using a mixed formulation in order to investigate the post-buckling morphology in the fully nonlinear regime. Considering different distributions of the residual stresses, we find that different morphological transitions occur around the material domain where the hoop residual stress reaches its maximum compressive value. The results provide useful guidelines in order to design morphable soft spheres, for example by controlling the residual stresses through active deformations. They finally suggest a viable solution for the nondestructive characterization of residual stresses in soft tissues, such as solid tumors.
Theory of the Spontaneous Emission in Photonic and Plasmonic Nanoresonators
Creators: name: Sauvan, C.
name: Hugonin, J. P.
name: Maksymov, I. S.
name: Lalanne, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We provide a self-consistent electromagnetic theory of the coupling between dipole emitters and dissipative nanoresonators. The theory that relies on the concept of quasi-normal modes with complex frequencies provides an accurate closed-form expression for the electromagnetic local density of states (LDOS) of any photonic or plasmonic resonator with strong radiation leakage, absorption and material dispersion. It represents a powerful tool to calculate and conceptualize the electromagnetic response of systems that are governed by a small number of resonance modes. We use the formalism to revisit Purcell's factor. The new formula substantially differs from the usual one; in particular, it predicts that a spectral detuning between the emitter and the resonance does not necessarily result in a Lorentzian response in the presence of dissipation. Comparisons with fully-vectorial numerical calculations for plasmonic nanoresonators made of gold nanorods evidence the high accuracy of the predictions achieved by our semi-analytical treatment.
description: submitted to Phys. Rev. Lett
Historical Memory and Its Influence on Relations between Tokyo and Taipei under President Ma Ying-jeou (2008–2016)
Creators: name: Perminova Vera Aleksandrovna
Publisher: name: Russian Japanology Review
Year: 2021
Subjects: Taiwan
Japan
Republic of China
Diaoyudao
Senkaku
problems of the historical past
foreign affairs

description: Taiwan, a former colony of Japan (1895–1945), for a number of different factors still remains the only region in the world that does not place emphasis on the negative sides of a rather long period of Japanese colonial rule. Problems of the historical past do not directly affect the development of traditionally close relations between Japan and Taiwan, but they play an important role in forming the “Taiwanese identity” and are closely related to the current issues of the foreign and domestic policies of the Republic of China. The ongoing feud between Mainland China and Taiwan, coupled with the current international political situation, also has an effect on the assessment by the Taiwanese of their colonial past and the policies of the Japanese Empire in the first half of the 20th century, and the perception of contemporary Japan in Taiwan. The article discusses the approaches of Taiwanese authorities to problems of the historical past under President Ma Ying-jeou (2008–2016) – a period when the Kuomintang built up equally good relations with Japan and China on the basis of the new conception of “Taiwanese identity”. Making efforts to reconcile the pro-unification and pro-independence parties, the president tried to form in Taiwanese society a balanced approach to the understanding of the Japanese and Chinese periods of Taiwan’s history, as well as the role of Japan in the development of the modern Republic of China. Calling himself “the best friend of Japan”, Ma Ying-jeou continued to strengthen ties between Tokyo and Taipei, and at the same time took a hard-line stance on the territorial dispute with Japan – the issue of sovereignty over the Diaoyudao (釣魚島)/Senkaku islands (or Diaoyutai islands 釣魚臺 as they are called in Taiwan), which appeared again on the agenda of Japan-Taiwan relations. However, the issues of the historical past during the Ma Ying-jeou era did not hamper the development of cooperation between Tokyo and Taipei, and, in 2008-2016, the image of Japan in Taiwan remained constantly positive.
Illegal Border Crossing: The Experience of Edo Period Travelers
Creators: name: Dudko Anastasiya Andreevna
Publisher: name: Russian Japanology Review
Year: 2021
Subjects: travel diaries
Edo period
border posts
sekishonuke
sekishoyaburi

description: Travel diaries of the Edo period contain records about border posts and descriptions of illegal border crossing. Travelers resorted to paying bribes, changing clothes, and going around border posts if they did not have a tegata document, or for other reasons. For example, Kobayashi Kuzufuru (1793–1880) in his diary Gochi Mōde describes how he and his wife, with the help of a guide, went around the Sekigawa border post twice because his wife did not have a tegata. Furukawa Koshoken (1726–1807) writes in his work Saiyū Zakki (1783) how, in order to travel the Satsuma province, he pretended to be a pilgrim. Sakata Kisen’o mentions in his diary of a journey from Edo to Izu, Izu-no Kuni Futokoro Nikki (1835), that he asked his friend who worked at the Hakone border post to let him through without making him wait in line. Diaries by female authors do not contain detailed descriptions of going around border posts, but they do mention hardships suffered during checks at border posts and the expenses caused by this. Despite the fact that one needs to consider the documents and diaries preserved at border posts, as well as documents of court proceedings in order to create the full picture of border crossings, the travel diaries of the Edo period give the general idea of the difficulties of travel and of how the travelers dealt with them.
X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa$_2$Cu$_3$O$_{6.54}$
Creators: name: Blackburn, E.
name: Chang, J.
name: Hucker, M.
name: Holmes, A. T.
name: Christensen, N. B.
name: Liang, Ruixing
name: Bonn, D. A.
name: Hardy, W. N.
name: Rutt, U.
name: Gutowski, O.
name: Zimmermann, M. v.
name: Forgan, E. M.
name: Hayden, S. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: X-ray diffraction measurements show that the high-temperature superconductor YBa$_2$Cu$_3$O$_{6.54}$, with ortho-II oxygen order, has charge density wave order (CDW) in the absence of an applied magnetic field. The dominant wavevector of the CDW is $\mathbf{q}_{\mathrm{CDW}} = (0, 0.328(2), 0.5)$, with the in-plane component parallel to the $\mathbf{b}$-axis (chain direction). It has a similar incommensurability to that observed in ortho-VIII and ortho-III samples, which have different dopings and oxygen orderings. Our results for ortho-II contrast with recent high-field NMR measurements, which suggest a commensurate wavevector along the $\mathbf{a}$-axis. We discuss the relationship between spin and charge correlations in YBa$_2$Cu$_3$O$_{y}$, and recent high-field quantum oscillation, NMR and ultrasound experiments.
description: Accepted for publication in Physical Review Letters. More data along the a-axis direction is included in this version 2
Properties of the emission region in pulsars with opposite subpulse drift directions in different profile components
Creators: name: Tedila, H. M.
name: Yuen, R.
name: Han, X. H.
Publisher: name: arXiv
Year: 2025
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate properties of the emission region as revealed by drifting subpulses of opposite drift directions at different parts of a pulse profile by using the rotating carousel model in an obliquely rotating pulsar magnetosphere of multiple emission states. Subpulse emission is assumed coming from m discrete emission areas that are distributed around the magnetic axis on a rotating carousel. The flow rate of the emission areas is determined by the E x B drift in an emission state, designated by the parameter y, in which E and the associated flow rate are dependent on y. In this model, subpulses appear to drift in an emission state if a relative speed exists between the plasma flow and corotation, and the diversity in the drift rates and directions corresponds to the relative speed being different in different parts of a profile. We apply the model to three pulsars that exhibit drifting subpulses of opposite drift directions to identify the emission states and the values of m. Our results show that different drifting subpulses correspond to particular values of m and y, and the latter implies that different emission states can coexist and operate concurrently in an emission region. We find that m does not show clear dependency on either the obliquity angle or emission state. We demonstrate that subpulse arrangement may vary across an emission region meaning that it is not always uniform on a carousel. We discuss drifting subpulses of opposite drift directions and subpulse drift-rate switching in terms of different emission states in our model, and speculate that they may be two manifestations of the same underlying mechanism.
description: 13 pages, 4 figures
Japan’s New Spatial Development Strategy: Challenges of the 21st Century
Creators: name: Timonina Irina L’Vovna
Publisher: name: Russian Japanology Review
Year: 2021
Subjects: Japan
regional development
spatial development strategy
sustainable development goals

description: The socio-economic consequences of regional unevenness remain one of the major problems of Japan’s development in the 21st century. Despite some success in regional economic policy, the main quantitative indicators of territorial-economic proportions or lack thereof have changed little over the past 30 years despite certain successes of regional economic policy. However, a number of internal and external factors have made it necessary to adjust approaches to regional strategic planning. These include globalization and the changing positioning of Japan in the world market, the partial loss of competitive positions in Asian markets, and increased competition between “international” cities for foreign investment. Internal factors include the decline of the Japanese population at a rate higher than previously expected, changes in people’s lifestyles and shifts in their value system, the increasing importance of such of its components as stability, security, favorable environmental conditions, attractive landscapes, and diversification of lifestyles. The new strategy of the 21st century is based on the idea of creating a multi-layered “compact and networked territorial structure”, which should ensure the availability of social services for residents of all localities by optimizing the social infrastructure and forming “new urban cores”. The economic development of regions should focus on the development of industries that rely on local resources and take into account local specifics, as well as the creation of “ecosystems” of innovations. Along with vitalizing regional and rural economy, Japan’s New Spatial Strategy also aims to adjust the excessive concentration of population and economic potential of large megacities (primarily Tokyo) and at the same time strengthen their global competitiveness. As necessary conditions for achieving the ambitious goals, the Spatial Development Strategy calls for achieving economic growth, increasing industrial productivity, building innovation through regional resources and interregional cooperation, increasing the participation of women and senior persons in work and public life, using modern “smart” technologies, and sharing economy formats. The traditional imperative in formulating Japan’s spatial development strategy remains the obvious desire to solve the problems of territorial unevenness in conjunction with solving other socio-economic problems of the country, in particular, the problems of environment and demographic decline (which is especially noticeable in the regions), issues of upgrading economic and social infrastructure.
Military Japanese Studies in the Russian Far East in the Early 20th Century
Creators: name: Datsyshen Vladimir Grigoriyevich
Publisher: name: Russian Japanology Review
Year: 2021
Subjects: Japanese studies
Amur Military District
Oriental Institute
officers specializing in Japanese studies

description: The article is devoted to the problems of the formation and development of military Japanese studies in the early 20th century. Its relevance is related to the fact that current problems of the Russian-Japanese relations are rooted in the political confrontation and numerous wars and armed conflicts between the two countries which erupted in the first half of the 20th century. The military have joined Japanese studies since its establishment in Russian higher education. Officers of the units of the Russian army stationed in the Far East studied Japanese and Japan together with university students – in the early 20th century the ratio of military and non-military students was almost 50:50. The first military specialists in Japanese studies either gave priority to research and education over military service, or successfully combined both. Joint training of officers and university students had a great impact on all aspects of life and work of the Oriental Institute, while causing criticism from both senior faculty managers and the high-ranked Russian military. Despite great success in the officers’ training at the Oriental Institute, the initial system of Japanese studies training was reformed, though its principles and traditions were preserved until the 1917 revolution. The article was written on the basis of archival and published documents of the Oriental Institute, with the use of academic works of the first Russian officers specializing in Japanese studies. The historical experience of the Japanese studies education and research is interesting and relevant for today’s Russian-Japanese relations.
Colloquium: Artificial spin ice: Designing and imaging magnetic frustration
Creators: name: Nisoli, Cristiano
name: Moessner, Roderich
name: Schiffer, Peter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Frustration in the presence of competing interactions is ubiquitous in the physical sciences and is a source of degeneracy and disorder, giving rise to new and interesting physical phenomena. Perhaps nowhere does it occur more simply than in correlated spin systems, where it has been studied in the most detail. In the past few years, a new perspective has opened in the study of frustration through the creation of artificial frustrated magnetic systems. These materials consist of arrays of lithographically fabricated single-domain ferromagnetic nanostructures that behave like giant Ising spins. The nanostructures' interactions can be controlled through appropriate choices of their geometric properties and arrangement on a (frustrated) lattice. The degrees of freedom of the material can not only be directly tuned, but also individually observed. Experimental studies have unearthed intriguing connections to the out-of-equilibrium physics of disordered systems and non-thermal granular materials, while revealing strong analogies to (spin) ice materials and their fractionalized magnetic monopole excitations, lending the enterprise a distinctly interdisciplinary flavor. The experimental results have also been closely coupled to theoretical and computational analyses, facilitated by connections to classic models of frustrated magnetism, whose hitherto unobserved aspects have here found an experimental realization. We review the considerable experimental and theoretical progress in this field, including connections to other frustrated phenomena, and we outline future vistas for progress in this rapidly expanding field.
description: Review Article, 36 Pages, 14 Figures. To appear in Rev. Mod. Phys
The Description of the Ainu and the Japanese by Gavriil Davydov (1807)
Creators: name: Klimova Olga Vadimovna
Publisher: name: Russian Japanology Review
Year: 2021
Subjects: Khvostov
Davydov
Sakhalin expedition
Russo-Japanese relations
Ainu
Japanese
Kuril Islands

description: In 1802, upon the orders of the Russian-American Company, Ensign Davydov and Lieutenant Khvostov were sent to deliver food supplies to the Russian colonies in America. In 1804, the Company repeatedly ordered these two officers to make the voyage to America. Before their departure, they met Rezanov, who arrived to Kamchatka after his unsuccessful mission to Japan, where he was supposed to establish trade relations. Due to this failure and the attempt to save Russian colonies and expand the territory of the Russian Empire, Rezanov decided to start trading with the local inhabitants of the Kuril Islands and Sakhalin. This study will examine the information about the Japanese, their settlements in the Kuril Islands, and the local inhabitants of the Kuril Islands – the Ainu. This research is based on the unique historical document The Journal of the Voyage of an American Company Tender Avos’ in 1807, under the Command of Ensign Davydov, which gives a detailed description of the Japanese, the Ainu, their settlements and compares them to the Russian ones.
Morpho-elastic model of the tortuous tumour vessels
Creators: name: Riccobelli, Davide
name: Ciarletta, Pasquale
Publisher: name: arXiv
Year: 2018
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Solid tumours have the ability to assemble their own vascular network for optimizing their access to the vital nutrients. These new capillaries are morphologically different from normal physiological vessels. In particular, they have a much higher spatial tortuosity forcing an impaired flow within the peritumoral area. This is a major obstacle for the efficient delivery of antitumoral drugs. This work proposes a morpho-elastic model of the tumour vessels. A tumour capillary is considered as a growing hyperelastic tube that is spatially constrained by a linear elastic environment, representing the interstitial matter. We assume that the capillary is an incompressible neo-Hookean material, whose growth is modeled using a multiplicative decomposition of the deformation gradient. We study the morphological stability of the capillary by means of the method of incremental deformations superposed on finite strains, solving the corresponding incremental problem using the Stroh formulation and the impedance matrix method. The incompatible axial growth of the straight capillary is found to control the onset of a bifurcation towards a tortuous shape. The post-buckling morphology is studied using a mixed finite element formulation in the fully nonlinear regime. The proposed model highlights how the geometrical and the elastic properties of the capillary and the surrounding medium concur to trigger the loss of marginal stability of the straight capillary and the nonlinear development of its spatial tortuosity.
On the existence of elastic minimizers for initially stressed materials
Creators: name: Riccobelli, Davide
name: Agosti, Abramo
name: Ciarletta, Pasquale
Publisher: name: arXiv
Year: 2018
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A soft solid is said to be initially stressed if it is subjected to a state of internal stress in its unloaded reference configuration. Developing a sound mathematical framework to model initially stressed solids in nonlinear elasticity is key for many applications in engineering and biology. This work investigates the links between the existence of elastic minimizers and the constitutive restrictions for initially stressed materials subjected to finite deformations. In particular, we consider a subclass of constitutive responses in which the strain energy density is taken as a scalar valued function of both the deformation gradient and the initial stress tensor. The main advantage of this approach is that the initial stress tensor belongs to the group of the divergence-free symmetric tensors satisfying the boundary condition in any given reference configuration. However, it is still unclear which physical restrictions must be imposed for the well-posedness of this elastic problem. Assuming that the constitutive response depends on the choice of the reference configuration only through the initial stress tensor, under given conditions we prove the local existence of a relaxed state given by an implicit tensor function of the initial stress distribution. This tensor function is generally not unique, and can be transformed accordingly to the symmetry group of the material at fixed initial stresses. These results allow to extend Ball's existence theorem of elastic minimizers for the proposed constitutive choice of initially stressed materials.
Mary Raines
Creators: name: Raines, Mary
Publisher: name: Zenodo
Year: 2021

description: To get a Mega888 Credit Card Free Make sure you're logged in as an existing member. Go to the "My account" page and click on 'Transfer if you are an existing member or newly registered member. Go to 'Mega888" from 'My Wallet and select the Wallet you prefer Visit this Website - https://ello.co/michaelpineda/post/viemi5-wxy3fwmcekymnsw.
Anomalous modulation of a zero bias peak in a hybrid nanowire-superconductor device
Creators: name: Finck, A. D. K.
name: Van Harlingen, D. J.
name: Mohseni, P. K.
name: Jung, K.
name: Li, X.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report on sub-gap transport measurements of an InAs nanowire coupled to niobium nitride leads at high magnetic fields. We observe a zero-bias anomaly (ZBA) in the differential conductance of the nanowire for certain ranges of magnetic field and chemical potential. The ZBA can oscillate in width with either magnetic field or chemical potential; it can even split and reform. We discuss how our results relate to recent predictions of hybridizing Majorana fermions in semiconducting nanowires, while considering more mundane explanations.
description: 7 pages, 7 figures
Lyapunov functions for nabla discrete fractional order systems
Creators: name: Wei, Yiheng
name: Chen, Yuquan
name: Liu, Tianyu
name: Wang, Yong
Publisher: name: arXiv
Year: 2018
Subjects: subject: Dynamical Systems (math.DS)
subject: Signal Processing (eess.SP)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper focuses on the fractional difference of Lyapunov functions related to Riemann-Liouville, Caputo and Grunwald-Letnikov definitions. A new way of building Lyapunov functions is introduced and then five inequalities are derived for each definition. With the help of the developed inequalities, the sufficient conditions can be obtained to guarantee the asymptotic stability of the nabla discrete fractional order nonlinear systems. Finally, three illustrative examples are presented to demonstrate the validity and feasibility of the proposed theoretical results.
description: 21 pages, 3 figures
Analytical and numerical analysis of a rotational invariant D=2 harmonic oscillator in the light of different noncommutative phase-space configurations
Creators: name: Abreu, Everton M. C.
name: Marcial, Mateus V.
name: Mendes, Albert C. R.
name: Oliveira, Wilson
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this work we have investigated some properties of classical phase-space with symplectic structures consistent, at the classical level, with two noncommutative (NC) algebras: the Doplicher-Fredenhagen-Roberts algebraic relations and the NC approach which uses an extended Hilbert space with rotational symmetry. This extended Hilbert space includes the operators $θ^{ij}$ and their conjugate momentum $π_{ij}$ operators. In this scenario, the equations of motion for all extended phase-space coordinates with their corresponding solutions were determined and a rotational invariant NC Newton's second law was written. As an application, we treated a NC harmonic oscillator constructed in this extended Hilbert space. We have showed precisely that its solution is still periodic if and only if the ratio between the frequencies of oscillation is a rational number. We investigated, analytically and numerically, the solutions of this NC oscillator in a two-dimensional phase-space. The result led us to conclude that noncommutativity induces a stable perturbation into the commutative standard oscillator and that the rotational symmetry is not broken. Besides, we have demonstrated through the equations of motion that a zero momentum $π_{ij}$ originated a constant NC parameter, namely, $θ^{ij}=const.$, which changes the original variable characteristic of $θ^{ij}$ and reduces the phase-space of the system. This result shows that the momentum $π_{ij}$ is relevant and cannot be neglected when we have that $θ^{ij}$ is a coordinate of the system.
description: 18 pages. JHEP style. Corrections made
Design of generalized fractional order gradient descent method
Creators: name: Wei, Yiheng
name: Kang, Yu
name: Yin, Weidi
name: Wang, Yong
Publisher: name: arXiv
Year: 2019
Subjects: subject: Signal Processing (eess.SP)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics
subject: F.2.2
subject: 26A33, 90C25

description: This paper focuses on the convergence problem of the emerging fractional order gradient descent method, and proposes three solutions to overcome the problem. In fact, the general fractional gradient method cannot converge to the real extreme point of the target function, which critically hampers the application of this method. Because of the long memory characteristics of fractional derivative, fixed memory principle is a prior choice. Apart from the truncation of memory length, two new methods are developed to reach the convergence. The one is the truncation of the infinite series, and the other is the modification of the constant fractional order. Finally, six illustrative examples are performed to illustrate the effectiveness and practicability of proposed methods.
description: 8 pages, 16 figures
Infinite series representation of fractional calculus: theory and applications
Creators: name: Wei, Yiheng
name: Chen, YangQuan
name: Gao, Qing
name: Wang, Yong
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics

description: This paper focuses on the equivalent expression of fractional integrals/derivatives with an infinite series. A universal framework for fractional Taylor series is developed by expanding an analytic function at the initial instant or the current time. The framework takes into account of the Riemann-Liouville definition, the Caputo definition, the constant order and the variable order. On this basis, some properties of fractional calculus are confirmed conveniently. An intuitive numerical approximation scheme via truncation is proposed subsequently. Finally, several illustrative examples are presented to validate the effectiveness and practicability of the obtained results.
Some fundamental properties on the sampling free nabla Laplace transform
Creators: name: Wei, Yiheng
name: Chen, Yuquan
name: Wang, Yong
name: Chen, YangQuan
Publisher: name: arXiv
Year: 2019
Subjects: subject: Optimization and Control (math.OC)
subject: Signal Processing (eess.SP)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Discrete fractional order systems have attracted more and more attention in recent years. Nabla Laplace transform is an important tool to deal with the problem of nabla discrete fractional order systems, but there is still much room for its development. In this paper, 14 lemmas are listed to conclude the existing properties and 14 theorems are developed to describe the innovative features. On one hand, these properties make the N-transform more effective and efficient. On the other hand, they enrich the discrete fractional order system theory
Curci-Ferrari Type Condition in Hamiltonian Formalism: A Free Spinning Relativistic Particle
Creators: name: Shukla, A.
name: Bhanja, T.
name: Malik, R. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Curci-Ferrari (CF)-type of restriction emerges in the description of a free spinning relativistic particle within the framework of Becchi-Rouet-Stora-Tyutin (BRST) formalism when the off-shell nilpotent and absolutely anticommuting (anti-)BRST symmetry transformations for this system are derived from the application of horizontality condition (HC) and its supersymmetric generalization (SUSY-HC) within the framework of superfield formalism. We show that the above CF-condition, which turns out to be the secondary constraint of our present theory, remains time-evolution invariant within the framework of Hamiltonian formalism. This time-evolution invariance (i) physically justifies the imposition of the (anti-)BRST invariant CF-type condition on this system, and (ii) mathematically implies the linear independence of BRST and anti-BRST symmetries of our present theory.
description: LaTeX file, 11 Pages, journal version
title:  La formazione degli adulti nei contesti informali di apprendimento al tempo del Covid-19: il caso della comunità Murid
Creators: name: Angeloni, Brigida
name: Di Rienzo, Paolo
Publisher: name: RomaTrE-Press
Year: 2021

description: La pandemia Covid-19 ha comportato conseguenze e trasformazioni prefigurando scenari inediti sul piano economico, sociale e personale, determinando anche nel campo della ricerca l’urgenza di esplorarne le ricadute. Il volume dà quindi conto delle indagini svolte e in corso, sin dai primi giorni del lockdown, dai docenti e dai collaboratori del Dipartimento di Scienze della Formazione dell’Università Roma Tre, toccando i temi più diversi: dalla didattica a distanza, all’università e nei diversi ordini di scuola, al futuro dei servizi di orientamento, dal lavoro socio-educativo nelle varie tipologie di servizi all’impatto della pandemia sulle comunità, dalle narrazioni ai linguaggi artistici a contrasto di quest’emergenza non solo sanitaria. Si sono così esplorate le diverse educazioni possibili, riassegnando centralità ai processi formativi e al benessere delle persone, provando a tratteggiare nuovi paradigmi e prospettive.
description: L’appartenenza religiosa fa parte dell’identità complessiva delle persone, che non si limita a caratterizzare la vita spirituale, ma guida ed orienta le scelte di vita e le azioni quotidiane. Spesso questi aspetti sono poco o mal conosciuti dalla società che accoglie gli immigrati e si ignorano le potenzialità di cui è portatrice l’educazione spirituale. Al fine di  conoscere gli aspetti educativi e orientativi delle comunità Sufi islamiche, si è realizzato uno studio di caso nella comunità senegalese dei Murid, utilizzando un approccio di ricerca di tipo qualitativo. Sono state realizzate delle interviste semi-strutturate con i responsabili di tre sedi della comunità, al fine di cogliere il ruolo dell’educazione ricevuta, che accompagna i singoli anche nel percorso migratorio e di integrazione nei Paesi di destinazione, per approfondire i saperi comunitari che hanno permesso di affrontare e gestire le conseguenze dell’emergenza sanitaria da Covid 19.
description: La Ricerca dipartimentale ai tempi del COVID-19
Time-domain response of nabla discrete fractional order systems
Creators: name: Wei, Yiheng
name: Gao, Qing
name: Cheng, Songsong
name: Wang, Yong
Publisher: name: arXiv
Year: 2018
Subjects: subject: Dynamical Systems (math.DS)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This paper investigates the time--domain response of nabla discrete fractional order systems by exploring several useful properties of the nabla discrete Laplace transform and the discrete Mittag--Leffler function. In particular, we establish two fundamental properties of a nabla discrete fractional order system with nonzero initial instant: i) the existence and uniqueness of the system time--domain response; and ii) the dynamic behavior of the zero input response. Finally, one numerical example is provided to show the validity of the theoretical results.
description: 13 pages, 6 figures
Analytical calculation of the inverse nabla Laplace transform
Creators: name: Wei, Yiheng
name: Chen, YangQuan
name: Chen, Yuquan
name: Wang, Yong
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics

description: The inversion of nabla Laplace transform, corresponding to a causal sequence, is considered. Two classical methods, i.e., residual calculation method and partial fraction method are developed to perform the inverse nabla Laplace transform. For the first method, two alternative formulae are proposed when adopting the poles inside or outside of the contour, respectively. For the second method, a table on the transform pairs of those popular functions is carefully established. Besides illustrating the effectiveness of the developed methods with two illustrative examples, the applicability are further discussed in the fractional order case.
Some properties for quaternionic slice-regular functions on domains without real points
Creators: name: Altavilla, Amedeo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30G35, 30C80

description: The theory of slice regular functions over the quaternions, introduced by Gentili and Struppa in [5], was born on domains that intersect the real axis. This hypothesis can be overcome using the theory of stem functions introduced by Ghiloni and Perotti ([6]), in the context of real alternative algebras. In this paper I will recall the notion and the main properties of stem functions. After that I will introduce the class of slice regular functions induced by stem functions and, in this set, I will extend the identity principle, the maximum and minimum modulus principles and the open mapping theorem. Differences will be shown between the case when the domain does or does not intersect the real axis.
description: 14 pages. first review. arXiv admin note: text overlap with arXiv:1008.4318 by other authors
Activation of a muscle as a mapping of stress-strain curves
Creators: name: Riccobelli, Davide
name: Ambrosi, Davide
Publisher: name: arXiv
Year: 2019
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The mathematical modeling of the contraction of a muscle is a crucial problem in biomechanics. Several different models of muscle activation exist in literature. A possible approach to contractility is the so-called active strain: it is based on a multiplicative decomposition of the deformation gradient into an active contribution, accounting for the muscle activation, and an elastic one, due to the passive deformation of the body. We show that the active strain approach does not allow to recover the experimental stress-stretch curve corresponding to a uniaxial deformation of a skeletal muscle, whatever the functional form of the strain energy. To overcome such difficulty, we introduce an alternative model, that we call mixture active strain approach, where the muscle is composed of two different solid phases and only one of them actively contributes to the active behavior of the muscle.