bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the relationship between SSIM and PSNR for DCT-based compressed images and video: SSIM as content-aware PSNR
Authors: Martini Maria 
Published: December 2022

<p>The aim of this paper is to show how the structural similarity metric SSIM for image quality assessment can be seen in many cases, such as DCT-based compressed images and video, as a content-aware version of the peak signal-to-noise ratio (PSNR). In fact, under some assumptions described in the paper, the first can be derived directly from the latter based on a single content-dependent parameter, i.e. the variance of the image / video frame. </p>
DIFERENCIAÇÃO SOCIOESPACIAL
Authors: Carlos Ana Fani Alessandri 
Published: December 2022

A “diferenciação espacial” é um tema central da Geografia que pode ser constatado numa vasta bibliografia, mas a “diferenciação socioespacial” introduz uma “qualidade” ao tema da diferenciação, obrigando-nos a realizar o deslocamento da análise em direção à compreensão do processo espacial, em sua determinação social. Tal fato produz outro deslocamento analítico da construção de um pensamento teórico produzido pela Geografia sobre a diferenciação espacial, e aquela de sua realização prática, qual seja a dimensão real da produção espacial como momento da reprodução social. O raciocínio aponta uma orientação precisa que é aquela de compreender o espaço geográfico como produção social, isto é, o ato de produção da vida como ato de produção do espaço sinalizando uma compreensão da dialética espaço-sociedade. Assim a prática socioespacial é a base e sustentação da vida. Portanto, o espaço analisado através da Geografia nos permitiria compreendê-lo como processo e movimento; produção/reprodução social. Significa também pensar nos conteúdos que esclarecem os conteúdos atuais desse processo. O ponto de partida é a compreensão do espaço como condição/meio e produto da reprodução social.
DIFERENCIAÇÃO SÓCIO-ESPACIAL, ESCALA E PRÁTICAS ESPACIAIS
Authors: Corrêa Roberto Lobato 
Published: December 2022

O presente texto discute a temática da diferenciação sócio-espacial em algumas de suas relações com a escala conceitual e as práticas espaciais. Resultado inevitável da ação humana, a diferenciação sócio-espacial pode ser concebida segundo duas escalas conceituais, a da rede urbana e a escala intra-urbana, nas quais processos e práticas espaciais produzem padrões distintos de diferenciação.
DA “DIFERENCIAÇÃO DE ÁREAS” À “DIFERENCIAÇÃO SOCIOESPACIAL”
Authors: De Souza Marcelo Lopes 
Published: December 2022

A Geografia tem, tradicionalmente, cultivado uma espécie de “visão de sobrevôo”, analisando as sociedades e seus espaços quase sempre “do alto” e “de longe”. Essa perspectiva é, de certa forma, aquela que é própria do Estado. E, de fato, o aparelho de Estado sempre foi o principal “locus de construção discursiva” da Geografia. Raramente o “locus de construção discursiva” dos geógrafos de formação foram ou têm sido os movimentos sociais. Isso tem sido, justamente, ao mesmo tempo uma causa e uma conseqüência da “visão de sobrevôo”. Não se sugere, neste trabalho, que “olhar de longe” seja algo em si mesmo reprovável. Afinal, o “olhar distanciado” permite que se ganhe uma perspectiva que é imprescindível e insubstituível: aquela que faculta uma “noção de conjunto”  e que permite trabalhar com as escalas da estratégia. O problema reside em adotar com exclusividade esse olhar. A solução, por conseguinte, não consiste em substituir meramente o “olhar de longe” pelo “mergulho no quotidiano”, mas sim em combinar as escalas (de análise e de ação) de modo a não abrir mão de nenhuma, tanto quanto combinar os olhares  o de perto e o de longe; aquele que permite “colocar-se de fora” (e à distância) com aquele que exige “estar dentro”.
Preparation and Characterization of Gastroreten-tive Sustained Release In-situ Gel of Lafutidine
Authors: Malviya Vedanshu , Tawar Mukund , Burange Prashant , Bairagi Ritu 
Published: December 2022

Background: The in-situ solutions, which float in the gastrointestinal region after gelation, is suited for long-term drug release. In this study, natural and synthetic polymers were used to try to build a Gastro-Retentive controlled release in-situ gel. To modulate the rate of drug distribution and increase bioavailability and stability, gastro-retentive controlled release in-situ gels were prepared.
Materials and Methods: For this project, 32 factorial designs were chosen. The two independent variables were sodium alginate (X1) and the ratio of HPMC K100M: Gellan Gum (X2) was preserved at the same concentration. As the study mentioned, sodium alginate is a natural polymer that is employed to build the gel matrix, while HPMC K100M and gellan gum serve as release retardants.
Results and Discussion: The drug and excipients study performed by FTIR and DSC revealed that both the drug and polymers used were compatible with other. Out of all the batches prepared LG7 proved to be the optimized batch because of the acceptable pH with a floating time of more than 24 hours and maximum drug content of 99.92 ± 0.04% and the lag time of 71 ± 0.57seconds. The viscosity of the optimized batch was found to be dependent on the concentration of sodium alginate and the viscosity before gelling and after gelling was found to be 32719 ± 1.65 and 39851 ± 1.77 cps. The mucoadhesion strength of the prepared optimized formulation was found to be 5.621 ± 0.41N/cm2. The optimized LG7 batch showed the most sustained rate of drug release with having a matrix model as the best-fitted model. The histopathology study revealed that the formulation was safe to use without causing any degeneration of the tissues. The stability study showed that the prepared formulation was stable for the time of the study as no significant changes were observed. Lastly, the sustained behavior of the prepared in-situ gel was due to the calcium carbonate in the gelling formulation which released carbon dioxide into the gastrointestinal environment, and the formulation became porous and buoyant, extending the residence period and the floating of the gel was due to the pH-induced ion gelation process that caused the gel to float.
Conclusion: It was concluded that the prepared controlled release in-situ gel of Lafutidine may prove to be a potential candidate for safe and effective controlled drug delivery for an extended period.
Admissible integral manifolds for partial neutral functional-differential equations
Authors: Nguyen Thieu Huy , Ha Vu Thi Ngoc , Yen Trinh Xuan 
Published: December 2022

UDC 517.9

We prove the existence and attraction property for admissible invariant unstable and center-unstable manifolds of admissible classes of solutions to the partial neutral functional-differential equation in Banach space

X

of the form

&

∂

∂
t

F

u
t

=
A

(
t
)

F

u
t

+
f

(
t
,

u
t

)

,

t
≥
s
,

t
,
s
∈
ℝ
,

&

u
s

=
ϕ
∈
𝒞
:
=
C

(

[
-
r
,0
]

,
X
)

under the conditions that the family of linear partial differential operators

(
A
(
t
)
)

t
∈
ℝ

generates the evolution family

(
U
(
t
,
s
)
)

t
≥
s

with an exponential dichotomy on the whole line

ℝ
;

the difference operator

F
:
𝒞
→
X

is bounded and linear, and the nonlinear delay operator

f

satisfies the

φ

-Lipschitz condition, i.e.,

‖
f

(
t
,
ϕ
)

-
f

(
t
,
ψ
)

‖
≤
φ

(
t
)

‖
ϕ
-
ψ

‖
𝒞

for

ϕ
,
ψ
∈
𝒞
,

where

φ

(
⋅
)

belongs to an admissible function space defined on

ℝ
.

We also prove that an unstable manifold of the admissible class attracts all other solutions with exponential rates. Our main method is based on the Lyapunov – Perron equation combined with the admissibility of function spaces. We apply our results to the finite-delayed heat equation for a material with memory.
On On the approximation of functions by Jacobi – Dunkl expansion in the weighted space

𝕃
2

(
α
,
β
)
Authors: Tyr O. , Daher R. 
Published: December 2022

UDC 517.5

We prove some new estimates useful in applications for the approximation of certain classes of functions characterized by the generalized continuity modulus from the space

𝕃
2

(
α
,
β
)

by partial sums of the Jacobi – Dunkl series. For this purpose, we use the generalized Jacobi – Dunkl translation operator obtained by Vinogradov in the monograph [Theory of approximation of functions of real variable, Fizmatgiz, Moscow (1960) (in Russian)].
Нове найпростіше доведення формули келі та зв’язок із рівняннями Кірквуда – Зальцбурга
Authors: Rebenko O. L. 
Published: December 2022

УДК 519.1

Наведено нове найпростіше доведення формули для кількості помічених корінних графів-лісів із заданою кількістю вершин. Частковим випадком цієї формули є формула Келі.
Would the Professional Training Sector Take the Advantage of the Virtual Environment that Was Presented Forcefully by COVID-19?
Authors: Aloraibi Maitham , Karam Amira , AlSorani Amal 
Published: December 2022

This applied research looks into the effectiveness of the virtual learning environment in the delivery of corporate and professional courses since the training provider was forced to shift to this mode of delivery since March 2020 due to the COVID-19 circumstances.
In literature, the effectiveness of virtual delivery in the basic schooling and higher education sectors is well researched and heavily debated amongst scholars and practitioners, especially during this pandemic. This is not the case, however, in the professional and corporate training field as this sector is often regarded as a voluntary provision that warrants the least priority to invest in during a global crisis; the like of COVID-19. The purpose of the research is to measure the effectiveness of virtual training provision, and how this mode of learning can help in developing skills and supporting learning to achieving their learning objectives. The effectiveness evaluation in this research was measured from the perspective of the end-user (the learner).
The research involved a quantitative questionnaire that was answered by 367 respondents amongst trainees who were enrolled in various professional training courses, post COVID-19, in virtual mode. The questionnaire items were purposely designed to gauge the learners’ satisfaction as a measure of effectiveness and quality of the virtual training environment. The questionnaire was distributed and administered electronically via a mass emailing campaign. Upon collecting the responses, the data was quantitatively analysed using descriptive quantitative analysis.
The analysis of the data indicates indeed high satisfaction rates amongst learners (more than 72% were satisfied, or higher). The effectiveness of virtual learning in helping trainees achieve their learning objectives and make good progress, however, was lower than the overall satisfaction rate. After months of riding the learning curve of the virtual learning experience, the learners showed mixed picture of reflection on their preferred mode of delivery in the future. Almost a third of the learners opted for blended learning mode, whereas nearly another third preferred virtual, and the remaining liked to go back to physical classes.
This research indicates that virtual learning is apparently lending itself to be a feasible mode of delivery of professional training courses. Its effectiveness, as perceived by the beneficiaries, is proven to continue improve as it matures over time. The prospect of this virtual learning methodology looks positive indeed despite the newness of its application on a massive scale post the COVID-19 pandemic.
Sport universitaire au Maroc
Authors: HARFOUF Soulaiman , MADRANE Mourad 
Published: December 2022

Ce travail traite de la question du Sport Universitaire (SU) au Maroc. Il adopte une problématique liée aux pratiques managerielles et à la gouvernance du SU dans les établissements marocains d’enseignement supérieur public. Il examine les facteurs responsables du dysfonctionnement de ce système et émet subséquemment une proposition susceptible de contribuer à l’amélioration de son rendement. Afin de réaliser ce diagnostic, un système de recueil et d’analyse de données a été utilisé. Une enquête de terrain a donc été menée dans 14 universités et 8 cités universitaires. 120 personnes-ressources ont été interviewées. 34 rapports, de contenus différents, ont par ailleurs fait l’objet d’un examen approfondi et guidé.
Les résultats mettent en évidence que le SU marocain souffre d’un manque plus ou moins important, en nombre et en qualité, de ressources humaines, financières, matérielles et infrastructurelles. D’autre part, l’organisation déficiente, l’absence de stratégies de gestion de l’existant, l’omission de l’évaluation régulière du secteur, la faible motivation et le défaut d’engagement des acteurs administratifs et associatifs marquent la démarche managériale du SU dans la majorité d’établissements d’enseignement et de la vie universitaire.
Polytropic Behavior in the Structures of Interplanetary Coronal Mass Ejections
Authors: Dayeh M. A. , Livadiotis G. 
Published: December 2022

Abstract
The polytropic process characterizes the thermodynamics of space plasma particle populations. The polytropic index, γ, is particularly important as it describes the thermodynamic behavior of the system by quantifying the changes in temperature as the system is compressed or expanded. Using Wind spacecraft plasma and magnetic field data during 1995 February–2015 December, we investigate the thermodynamic evolution in 336 interplanetary coronal mass ejection (ICME) events. For each event, we derive the index γ in the sheath and magnetic ejecta structures, along with the pre- and post-event regions. We then examine the distributions of all γ indices in these four regions and derive the entropic gradient of each, which is indicative of the ambient heating. We find that in the ICME sheath region, where wave turbulence is expected to be highest, the thermodynamics takes longest to recover into the original quasi-adiabatic process, while it recovers faster in the quieter ejecta region. This pattern creates a thermodynamic cycle, featuring a near adiabatic value γ ∼ γ

a
(=5/3) upstream of the ICMEs, γ

a
− γ ∼ 0.26 in the sheaths, γ

a
− γ ∼ 0.13 in the ICME ejecta, and recovers again to γ ∼ γ

a
after the passage of the ICME. These results expose the turbulent heating rates in the ICME plasma: the lower the polytropic index from its adiabatic value and closer to its isothermal value, the larger the entropic gradient, and thus, the rate of turbulent heating that heats the ICME plasma.
Spectral Characterization of the Low-mass Companion μ Virgenes B
Authors: Valencia Julissa Villalobos , Burgasser Adam J. , Hsu Chih-Chun , Aganze Christian 
Published: December 2022

Abstract
We report optical and near-infrared spectral characterization of an M dwarf companion to the bright F2 star μ Virgenes. Data from Shane/Kast and IRTF/SpeX yield identical spectral types of M5, and spectral features indicate solar metallicity ([Fe/H] = −0.05 ± 0.20) with no evidence of low surface gravity features at optical or near-infrared bands. Strong Hα emission (

log

10

L

H
α

/

L

bol

= −3.80 ± 0.09) is consistent with an active source at saturation, while the lack of Li i absorption and low surface gravity features constrains the system’s age to ≳200 Myr. Both metallicity and age estimates of the companion are consistent with its primary. As a well-resolved companion to an exceptionally well-characterized bright star, μ Virgenes B serves as a useful benchmark at the transition between partially and fully convective stars.
Small Magellanic Cloud Field Stars Meddling in Star Cluster Age Estimates
Authors: Piatti Andrés E. 
Published: December 2022

Abstract
I revisited the age of the Small Magellanic Cloud (SMC) cluster HW 42, whose previous estimates differ in more than 6 Gyr, thus challenging the most updated knowledge of the SMC star formation history. I performed an analysis of number stellar density profiles at different brightness levels; carried out a field star decontamination of the cluster color–magnitude diagram; and estimated the cluster fundamental parameters from the minimization of likelihood functions and their uncertainties from standard bootstrap methods. I conclude that HW 42 is a

6.2

−
1.3

+
1.6

Gyr old ([Fe/H] = −0.89

−
0.11

+
0.10

dex) SMC cluster projected on to a SMC composite star field population which shows variations in magnitude, color, and stellar density of Main Sequence stars. The present outcome solves the conundrum of the previous age discrepancies and moves HW 42 to a region in the SMC age–metallicity relationship populated by star clusters.
Le régime rentier en Russie et son évolution après la guerre en Ukraine
Authors: Faudot Adrien , Rossiaud Sylvain 
Published: December 2022

À la suite du déclenchement de la guerre en Ukraine, l’objectif affiché par l’Union européenne est d’assurer une déconnexion énergétique avec la Russie. De nouvelles interdépendances énergétiques internationales se dessinent en conséquence. À cet égard, l’une des ruptures principales pourrait être la fragmentation des relations énergétiques internationales. Avec toutes les précautions qui s’imposent dans le contexte actuel d’incertitude radicale, cet article questionne la nature et la portée de ce changement structurel, ainsi que ses implications potentielles sur le régime d’accumulation rentier en Russie. Pour ce faire, l’approche institutionnaliste et historique de la théorie de la régulation (TR) est privilégiée. Nous retraçons donc la trajectoire d’intégration internationale de l’industrie pétrolière russe, et l’enracinement du mode de régulation rentier dans ce pays. L’analyse des inflexions observées à la suite de la première crise ukrainienne de 2014 permet de mettre en exergue les mécanismes adaptatifs intégrés dans le mode de régulation de l’industrie pétrolière et, plus globalement, du régime d’accumulation. Classification JEL : F50, F51, F59 .
Souveraineté technologique ou isolement ? Conséquences de la guerre en Ukraine sur le secteur russe du numérique
Authors: D. Volkov Dmitry 
Published: December 2022

À travers l’analyse de l’évolution du secteur russe du numérique, cet article postule que l’invasion russe de l’Ukraine, les sanctions qui en ont résulté et le retrait des entreprises technologiques étrangères ont renforcé certaines des tendances qui ont caractérisé les relations État-marché du secteur depuis trois décennies. L’une de ces tendances a été le renforcement des éléments néoprébendiers du système capitaliste russe, devenant un facteur important dans le choix des stratégies des acteurs du marché adoptées en fonction de leur marché cible (international ou national), de leur stratégie client (B2B, B2C, PME ou grande firme) et de leur spécialisation produit. Une autre conséquence importante du conflit a été la rupture des cycles d’apprentissage et de sélection des entreprises russes du numérique, ce qui risque d’avoir un impact négatif sur le développement technologique du pays en raison des changements dans l’accès aux technologies modernes et dans les sources dominantes de financement et de demande. Classification JEL : F50, F51, L05, L63 .
Arménie, Géorgie, Azerbaïdjan et la guerre en Ukraine : les dividendes de l’ambiguïté
Authors: Cordonnier Christophe , Vercueil Julien 
Published: December 2022

Les trois républiques du Sud-Caucase sont indirectement mais significativement touchées par la guerre en Ukraine. Du fait des conflits qui les traversent, elles ont abordé cette crise internationale en ordre dispersé. Toutefois, malgré des structures économiques très dissemblables, ces trois pays ont adopté des positions diplomatiques similaires vis-à-vis du conflit, maintenant une ambiguïté qui leur a permis d’éviter de pâtir de manière excessive de ses conséquences sur les approvisionnements en matières premières stratégiques. Si l’inflation s’est maintenue ou accélérée en 2022, ces économies ont poursuivi une trajectoire de croissance entamée en 2021, nourrie par leur position géographique favorable qui leur permet de servir de refuge aux populations russes fuyant le régime et la guerre, mais aussi de plaque tournante logistique et commerciale à l’échelle de la région. L’enjeu pour le moyen terme sera de maintenir cette position d’équilibre instable entre Russie, Union européenne et Turquie. Classification JEL : F24, F32, F51, O53.
La guerre en Ukraine : choc géopolitique régional et global
Authors: Kastouéva-Jean Tatiana 
Published: December 2022

Limitée (pour l’instant) militairement au territoire de l’Ukraine, la guerre déclenchée par la Russie le 24 février envoie des ondes de choc géopolitiques bien au-delà des deux protagonistes du conflit militaire. Ce choc frappe à la fois les anciennes républiques soviétiques et les pays européens, en les poussant à réduire leurs dépendances à la Russie et à redéfinir les lignes directrices qui ont longtemps guidé leurs politiques étrangères. Au-delà de ce périmètre à l’ouest et au sud des frontières russes, certains pays semblent tirer des bénéfices de cette guerre à court terme comme, par exemple, la Chine ou l’Inde qui peuvent acquérir du gaz et du pétrole russes à prix « cassés ». Cependant, même pour ces pays, la remise en cause de l’ordre international comporte de nombreux risques ; certains s’annoncent difficilement maîtrisables dans un monde plus fragmenté où même la dissuasion nucléaire ne semble plus garantir la stabilité. Classification JEL : F10, F50, F51, F59, F65 .
Panorama des plateformes de veille : étude comparée des fonctionnalités collaboratives
Authors: Andro Mathieu , Bondu Jérôme 
Published: December 2022

Aujourd’hui, les besoins en veille collaborative et l’interfaçage avec des réseaux sociaux d’entreprise sont devenus essentiels : l’information a d’autant plus de valeur qu’elle est partagée, visible et valorisée. Mais beaucoup de services de veille fonctionnent encore sur un modèle rigide, plus vertical qu’horizontal, avec des contenus faiblement personnalisés. Les plateformes de veille elles-mêmes induisent aussi parfois des freins fonctionnels. Beaucoup essaient de remédier à cela en proposant cette dimension d’interfaçage et de collaboration. Nous proposons ici un grand tableau comparatif.
Plateformes de veille : étude comparée des fonctionnalités de consultation, de recherche et de capitalisation
Authors: Deschamps Christophe , Andro Mathieu , Bondu Jérôme 
Published: December 2022

Un critère important pour évaluer la qualité d’une plateforme de veille est la qualité de ses fonctions de recherche et de capitalisation des contenus. Dans notre panorama des plateformes de veille, réalisé en 2021, nous avons établi, pour 22 solutions, quatre tableaux comparatifs : sur la capitalisation des contenus et le moteur de recherche interne, sur les facettes et les filtres, sur les fonctionnalités de recherche avancée (corpus et métadonnées), ainsi que sur d’autres fonctionnalités de recherche.
Plateformes de veille : analyses d’une enquête auprès des veilleurs
Authors: Andro Mathieu , Bondu Jérôme , Deschamps Christophe 
Published: December 2022

Dans le cadre de notre grande enquête-panorama s ur les plateformes de veille, nous avons récolté les réponses de 72 veilleurs. Quelles sont les attentes de leurs clients ? Comment leur métier est-il perçu ? Leur importance est-elle reconnue ? Quels sont les modes de diffusion qu’ils privilégient ? Quelles sont leurs attentes à l’égard des technologies ? en matière de veille collaborative ?