bluuebunny/crossref_metadata_2025 huggingface dataset:
La pandemia del SARS-CoV-2 como riesgo global: desigualdad e inseguridad humana
Authors: Zavaleta Hernández Sandra Kanety , Rico Becerra Cesari Irwing
Published: September 2021

La pandemia del SARS-CoV-2 cuestiona las estrategias de seguridad global dominantes y resalta las inmensas contradicciones de nuestro modo de vida. Este artículo tiene por objetivo analizar, desde la perspectiva de la seguridad humana, la pandemia como riesgo y amenaza para la vida social a escala global. Se retoman las categorías conceptuales de seguridad humana y riesgo global, para comprender las desigualdades, violencias estructurales y vulnerabilidades que acompañan la emergencia sanitaria y que perpetuarán sus afectaciones en el tiempo, para hacer de ella una crisis social total. Mediante las metodologías cuantitativa y cualitativa, se examinan algunas de las principales tendencias de riesgo que la pandemia representa. La hipótesis es que, con la pandemia, se suprimen los resquicios de seguridad y certeza brindados por la modernidad, cuyas contradicciones provocaron la catástrofe planetaria más importante en la historia reciente. Asimismo, la pandemia muestra que las estrategias ancladas a la seguridad tradicional no son las más apropiadas para enfrentar las consecuencias que tendrá la crisis sanitaria. La reivindicación de perspectivas multidimensionales sobre la seguridad se hace imprescindible, para responder a riesgos y amenazas.

Abstract

The SARS-CoV-2 pandemic has questioned the dominant international security strategies, and also highlighted the immense contradictions in our global way of life. From a human security perspective, this investigation analyses the pandemic as a risk and threat to social life on a global scale. The conceptual categories of human security and global risk are used to understand the inequalities, structural violence and vulnerabilities that accompany the health emergency and make it a total social crisis. Some of the main risk trends that the pandemic represents are quantitatively and qualitatively analyzed. It is proposed that the global pandemic is leading to the suppression of the loopholes of security and certainty provided by modernity, whose contradictions have led us to suffer the most important planetary catastrophe in recent history. Likewise, the pandemic has shown that the strategies anchored to traditional security are not the most appropriate to face the consequences that the current health crisis will have. Therefore, to respond to these risks and threats, it is essential to develop new perspectives on security.
Exact plane-wave solution of equations of gravitation theory with massive graviton
Authors:   M.V. Lomonosov Moscow State University, Baiderin A.A. , Denisova I.P. ,   Moscow Aviation Institute (National Research University), Rostovsky V.S. ,   M.V. Lomonosov Moscow State University
Published: September 2021

The theory of gravitation with a massive graviton, which was proposed by Visser, is considered. The exact solution of this theory is found when the source of the gravitational field is plane scalar wave. The Hamilton-Jacobi method obtained the laws of motion of massive and massless particles in this gravitational field.
Analysis for transverse shake vibration of high-rise buildings based on partial differential equation
Authors:   Jilin Jianzhu University, Li Li , Martínez Raquel ,   Polytechnic School of Cuenca, Institute of Applied Mathematics in Science and Engineering (IMACI), University of Castilla-La Mancha
Published: September 2021

In order to overcome the problems of long analysis time, low accuracy and high energy consumption in traditional lateral vibration analysis methods of high-rise buildings, a new method of lateral vibration analysis of high-rise buildings based on partial differential equation is proposed. Based on Hamilton's principle, the partial differential equation of lateral vibration of high-rise buildings is established, and the Galerkin method is used to solve the partial differential equation until the discrete solution is obtained, and then the displacement response of high-rise buildings under different excitation frequencies is obtained. The experimental results show that compared with the traditional method, the proposed method has the advantages of short calculation time, high accuracy and low energy consumption.
Deposition of a multi-layer coating in a gas-metal beam-plasma formation at low pressure
Authors:   Institute of High Current Electronics SB RAS, Denisov V.V. , Denisova Yu.A. ,   Institute of High Current Electronics SB RAS, Vardanyan E.L. ,   Ufa State Aviation Technical University, Ostroverkhov E.V. ,   Institute of High Current Electronics SB RAS, Leonov A.A. ,   Institute of High Current Electronics SB RAS, Savchuk M.V. ,   Institute of High Current Electronics SB RAS
Published: September 2021

The vacuum-arc plasma-assisted method was used to deposit a multilayer coating based on Ti and Al in two discharge systems - in a traditional plasma-assisted vacuum-arc spraying system and in a system for generating of gas-metal beam-plasma formation formed in a hollow cathode of a non-self-sustained low pressure glow discharge. The coatings obtained in the investigated discharge schemes are close in elemental and phase composition. In the coating deposited in the plasma-beam formation, the aluminum content is 8% lower, which is probably due to the overall higher average value of the ion flux density on the surface of the growing film in a non-self-sustained glow discharge. In the coating obtained by sputtering in a beam-plasma formation, there are no elements that are part of the material of the sputtered hollow cathode. Gas-metal beam-plasma formations, formed at low pressure, are promising in the processes of functional coatings deposition by the vacuum-arc plasma-assisted method.
Analytical account for off-axis effects in X-ray radiation of free electron lasers
Authors:   Moscow State University (Moscow, Russian Federation), Zhukovsky K.V.
Published: September 2021

We give analytical description of generation of harmonics of the undulator radiation (UR) with account for the finite electron beam size, emittance, off-axis beam deviation and electron energy spread, as well as for the constant magnetic components and field harmonics effects. We give exact analytical expressions for the generalized Bessel and Airy functions, which describe the spectrum line shape and intensities in the two-frequency bi-harmonic undulator with account for the above factors. The obtained analytical formulae distinguish contributions of each field component and every undulator and beam parameter on the harmonic radiation in free electron lasers (FEL). The effect of the field on the harmonic radiation is analyzed with account for the beam finite size and its off-axis deviation. The phenomenological model is employed for the FEL modeling; with its help we study the harmonic generation, including even ones, in the experiments LCLS and LEUTL. We demonstrate analytically that strong second FEL harmonic in X-ray FEL at the wavelengths λ = 0.75nm in the LCLS experiment is caused by the deviation of the electron trajectories off the axis in 15 μm on the gain length 1.6 m, which is comparable with the beam size; the strong second FEL harmonic in the LEUTL experiment at the wavelength λ = 192nm can be attributed to interaction of the electrons in wide, ~ 0.2 mm, beam with the photon radiation at the gain length 0.87 m. The modeling results fully agree with the measurements. The developed formalism allows the analysis of projected and built FELs and their radiation, helps minimizing losses and correcting magnetic fields; it also shows physical background and reasons for each harmonic radiated power in the FEL.
Quantum defect and common fractions
Authors: Verin O.G.
Published: September 2021

The common fractions N1/N2, where N1 and N2 - the small integers, quite often are used at the quantum-mechanical description of microcosm objects (for example, fractional charges of quarks and some quantum characteristics, such as particles spin). Recently the fractional quantum Hall effect was discovered, and common fractions have considerably expanded their presence in microcosm physics. The theory of the fractional quantum Hall effect has appeared nontrivial, so the Nobel Prize on physics in 1998 was awarded not only for discovery of the effect in 1982 (Daniel Tsui and Horst Störmer) but also for the theory creation in 1983 (Robert Laughlin). And now one more sensational discovery: common fractions were «detected» at the analysis of experimental characteristics of «hydrogen-like» atoms and ions (with only one electron on an outer shell). It has appeared, that the effective main quantum number of outer shell electron, that is, subject to quantum defect (Rydberg correction), can be expressed in common fractions.
On the internal geometry of the trajectories of charged particles in symmetric external fields
Authors:   Irkutsk State University, Voronova E.A. , Korenblit S.E. ,   Irkutsk State University
Published: September 2021

The curvature and torsion of the trajectories of charges in external gauge fields, including the fields of magnetic monopoles, are calculated. It is shown that these quantities are efficiently calculated using the equations of motion and first integrals. For a wide class of magnetic fields, their form-invariant combination was found.
Structure-phase states and properties of rail tread surface at long-term operation
Authors:   Institute of High Current Electronics SB RAS, Ivanov Yu.F. , Kormyshev V.E. ,   Siberian State Industrial University, Gromov V.E. ,   Siberian State Industrial University, Yuriev A.A. ,   JSC «Evraz West-Siberian Metallurgical Combine»
Published: September 2021

Using the methods of modern physical material science the investigations of structure-phase states and properties at different depth from tread surface of differentially quenched rails at extremely long-term operation (passed tonnage 1411 mln t) are carried out. The hardness decrease from 37.1 to 35.8 HRC at the depth 2 and 10 mm and microhardness from 1481 to 1210 MPa, respectively is revealed. The established multiple transformation of tread surface structure concludes in: fracture of lamellar pearlite structure and subgrain structure formation of submicronsizes (100-150 nm); precipitation of carbide phase nanoparticles (30-55 nm)along the boundaries and in the volume ofsubgrains; growth of microdistorsions and α-Fe crystal lattice parameter; growth of scalar and excess dislocation density. The suggestions about the possible reasons of observable regularities are made.
Transformation Protocol for BL21(DE3) Competent Cells (C2527I) v2
Authors: England Biolabs New
Published: September 2021

This transformation protocol is for the C2527I cells. (For the C2527H protocol, see here.)
TGen North high throughput SARS-CoV-2 tiled amplicon sequencing v1
Authors: Centner Heather , Pfeiffer Ashlyn , Porter Tanner , Patel Ronuck , Goedderz Andrew , K McDaniel Timothy , Driebe Elizabeth , Engelthaler Dave
Published: September 2021

Our goal for this project was to incorporate and operationalize a lean laboratory processing method that decreases costs, time, and complexity and increases throughput and accessibility for SARS-CoV-2 tiled amplicon sequencing.
Sarcófagos en La Rioja entre el final del mundo romano y el auge de la Edad Media
Authors: Calonge Miranda Adrián
Published: September 2021

En el territorio de La Rioja, el auge del cristianismo se produjo a partir del siglo IV y fue avanzando progresivamente en las ciudades y en el ámbito rural. Las élites jugaron un papel importante para posibilitar la extensión de este credo con la construcción de nuevos templos, algunos de ellos de fundación privada. Pero también era necesario el establecimiento de nuevos espacios funerarios de acuerdo con las costumbres de la nueva religión.
El uso del sarcófago por parte de estas aristocracias fue un motivo de prestigio. Algunos de ellos fueron depositados en mausoleos en el interior de iglesias con una clara intención de ser recordados y de añadir una preeminencia religiosa al poder político, económico y social que ya tenían. Otros se enterraron en cementerios, urbanos o rurales, pero en tumbas que mostraban su estatus privilegiado. El objetivo es analizar los sarcófagos de arenisca y sin decoración que se pueden considerar como de producción local y los que fueron importados desde los diferentes talleres ubicados en la provincia de Burgos.
Applicability of the Web Interface of Provided Electronic Services
Authors:   University of Zilina, Faculty of Operation and Economics of Transport and Communications, Department of Communications, Univerzitna 1, 01026 Zilina, Slovakia, Koncova Dominika , Kremenova Iveta , Fabus Juraj , Galovicova Terezia
Published: September 2021

The aim of the Paper is to inform about necessity of evaluating usability of websites and the tools that are appropriate to be used for it. Paper defines electronic services from different authors and differences that it creates. Paper states useful methodologies, that could be used for such evaluation and subsequently to parse it by using methodology of 360°. Lastly recommended methodology of 360° is then described in subsequential steps necessary for complex analysis. Conclusion states creation of possible information gap created by using this method, that needs further research.
ADAPTIVE MECHANICAL FILTER FOR PIEZOELECTRIC ACCELEROMETER
Authors: Perederko A.L.
Published: September 2021

When conducting dynamic tests, when simulating shock effects, the measurement system - from the sensor to the data acquisition unit is subject to significant overloads. In this circuit, the accelerometer is the most vulnerable link. Therefore, piezoelectric accelerometers have become widely used in measuring shocks as more reliable and durable, but they also have a number of disadvantages.

Thus, under broadband vibration effects, excitation in the region of mechanical resonance is observed. That is, the material of the sensor crystal may not have an excessive mechanical load, but generate a large amount of output charge due to the resonance of the sensor. This increases the electrical signal and can lead to saturation or, in many cases, damage to the signal shapers and amplifiers following the sensor. The result of such modes of operation is the loss of data due to the displacement of direct current over time.

There is often a shift of the zero level of the output signal. When piezoelectric elements are in resonance, there may be a relative displacement of the sensing element. This state of overload leads to the appearance of parasitic output charges, which leads to a change in the generated charge in a short period of time. Due to mechanical overload, under the action of high-intensity shocks, physical destruction of the sensor is also possible.

In many cases, the use of mechanical filters made of viscoelastic materials, which are placed between the object of measurement and the piezoelectric accelerometer (sensor), prevents the undesirable consequences of these shortcomings and improves the process of measuring shocks. The use of mechanical filters made of viscoelastic materials makes it possible to significantly reduce the amplitude of oscillations of the piezoelectric accelerometer (over -12 dB) and shift its resonant frequency towards higher frequencies.

That is, the use of mechanical filters significantly reduces the mechanical load on the sensor, which makes the process of measuring vibration (especially shock) more predictable.
“WAKE-UP CALL FOR THE WHITE RACE”: HOW STORMFRONT FRAMED THE ELECTIONS OF OBAMA AND TRUMP
Authors: Törnberg Anton , Törnberg Petter
Published: September 2021

We investigate how users on a prominent forum for white supremacists interpreted and framed two seminal events for the far-right in the U.S., the elections of Obama in 2008 and Trump in 2016. These cases precipitated dramatic shifts in the far-right alliance and conflict structure. We combine computational methods and qualitative analysis on a corpus of over ten million posts on Stormfront.org to show how movement actors framed institutional changes and constructed them as opportunities for action. We highlight grassroots framing, the collective and contested bottom-up processes through which external events are framed and reframed by online activists and thus shaped into opportunities for action. Our research demonstrates how users shifted from framing Obama’s election as a threat, to framing it as a “victory in disguise,” creating new opportunities for political action through extraparliamentary methods. Similarly, users framed Trump's election as creating possibilities for radical change through the established political system.
On the vertebral neurological and biological aspects of osteochondrosis
Authors: Popelyansky Y. Y.
Published: September 2021

The root cause of osteochondrosis is the defeat of a small pulp within the vertebral segment. The clinical significance of the pathology initiated by this education is very great. The complex knot of this discrepancy was unleashed by individual radiologists, who limited this supposedly local process to its morphological framework. However, broad-minded specialists in radiological diagnostics have long risen above this localizationism and assessed not only the X-ray morphological, but also the clinical, especially neurological, aspects of the problem.
Personality profile peculiarities of patients with vegetative disfunction syndrome (taking into account functional state of cell membranes)
Authors: Khasanova D. R. , Ismagilov М. F. , Mendelevich V. D. , Baranova Е. А. , Oslopov V. N.
Published: September 2021

Personality characteristics in 64 patients with vegetative disfunction syndrome, associated with one of genetic marker Na+/Li+ countertransport velocity in erythrocyte membrane have been studied. It was established that emotional and personal disorders are more manifested in persons with vegetative crises, belonging to the III rd quartile. It can be supposed that a level of transmembrane ionotransport has a significance in formation of a pathologic psychovegetative pattern, including personal peculiarities, which do form a clinical picture phenotype.
Vegetative regulation state in children with congenital heart diseases of acyanotic type
Authors: Medvedev V. N. , Khasanova D. R. , Vergasov Е. А. , Nickulin N. L.
Published: September 2021

State of initial vegetative tonus in 68 children of age from 7 to 13 with congenital heart diseases (of acyanotic type) was studied by mathematical analysis method of cardiac rhythm variability at pre-operation and post-operation periods. It was established, that in patients with congenital heart diseases dynamics peculiarities of vegetative nervous systems state depend on operations conditions and character of initial vegetative tonus in pre-operation period. It was determined, that most unfavourable days with great variation of vegetative characteristics are the 1st, 2 nd and also the 5 th and the 6 th days. The above said should determine therapy tactics with taking into account vegetative regulation.
Benign paroxysmal dizziness of position
Authors: Manz F.
Published: September 2021

Dizziness is one of the most common complaints of patients visiting a neurologist. The most common is benign paroxysmal vertigo of position BPHP.
Modern concepts of the pathogenesis of syringomyelia
Authors: Mendelevich Е. G. , Bogdanov Е. I.
Published: September 2021

"Syringomyelia" is now a general term for a group of diseases characterized by the presence of a cavity in the spinal cord. For many years, syringomyelia was considered a degenerative pathology of the spinal cord.
Clinical structure of motor disorders in patients, having hadcerebral insult, and their evaluation with the help of applied mathematical statistics
Authors: Shevchenko L. A.
Published: September 2021

On the basis of analyzing clinical data and data from past history of patients with postinsult neurologic dificiency, a conclusion has been made by correlation analysis and determination of connection closeness between separate clinical signs. The conclusion tells about nonhomogeneity of motor disorders genesis in patients with hemi-sphere insult, foundation of which different chains of pathophysiology process make up.
Cerebrovascular pathology in patients with hemorrhagic fever
Authors: Novikova L. B.
Published: September 2021

It was performed complex ultrasound investigation of 50 patients with hemorragic fever at different stages of disease. Analysis of dopplerographic parameters showed, that in acute stage of disease the following patterns of changed cerebral blood flow can be determined: poor cerebral perfusion, stenosis and venous discirculation. In reconvalescent patients in comparison with the control group reliable deviations retained, presented mostly by autoregulatory disorders. For prognostic risk development evaluation of late neurologic complications in patients, having had hemorrhagic fever, cerebro-renal index was suggested.
Experience in solving organizational and clinical issues of providing care for cerebrovascular diseases
Authors: Berdichevsky М. Ya. , Karmiryan S. A. , Geiko I. I. , Aristova L. А. , Kalustov S. G. , Savin А. I.
Published: September 2021

Vascular diseases of the brain are widespread and largely determine such indicators of public health as life expectancy, morbidity, and mortality. In the overall structure of mortality, cerebral strokes rank second after heart disease.
Philosophical and psychological views of V.M. Bekhterev (1857-1957)
Authors: Drapkina S. Е.
Published: September 2021

The outstanding scientist V.M. Bekhterev is known as a pioneer in a number of fields of natural science and medicine - neurology and psychiatry, physiology, biology, psychology and pedagogy.
Nudge in The Conditions of Digital Transformation: Behavioral Basis
Authors:   Novosibirsk State Technical University, Shmakov Alexandr V. ,   Novosibirsk State University of Economics and Management
Published: September 2021

Digital transformation in most cases has a positive impact on the economy. However, there is a possibility of negative consequences that worsen the standard of life of the population. Society wants to avoid a decline in living standards. The state policy to minimize the risks of digitalization should be developed for these purposes. Digital transformation leads to the complication of the technological environment, to the deformation of social relations, to a change in decision-making processes. The complexity of the technogenic environment leads to increased cognitive distortions and irrational behavior. Living standards are declining as a result. Classical approaches to government regulation often do not take into account psychophysiological and sociocultural behavioral factors. As a result, the regulation does not have the expected effect. This is especially evident in situations of uncertainty and longtime intervals. Behavioral economics and nudge can help solve these problems. This article provides a systematization and description of the factors that determine behavior. Decision-making processes are characterized. A systematization and explanation of cognitive distortions is proposed. An overview of approaches to the use of nudges to prevent cognitive distortions is proposed. Cases of using nudges to reduce the risks of digitalization are presented.
The School Scene of Education: The Dead Archive or Embodied Memory?
Authors: Dziubałtowska-Woźniak Martyna
Published: September 2021

The article presents humanistic education as a process of transmission (values, beliefs, memories, stories, tales). The author focuses on the student as a co-creator of the educational event and what is preserved in his memory. The topic was developed on the basis of the performative concept of the archive and repertoire formulated by Diana Taylor. The article discusses school practices that involve the use of unattractive, anachronistic texts and working methods and present a simplified interpretation of the past, implementing the current discourse of power.
Contemporary Youth Speech: Linguistic and Cultural Conceptualisations of the Phenomenon
Authors: Wileczek Anna
Published: September 2021

The article covers the ways to understand and describe youth slang as a social language variety from three perspectives. The first one presents the youth slang conceptualisation as the effect of language studies from the past several years, the second perspective refers to making use of the ways to describe the language of young generations in media space, while the third one exposes the significance of slang among teenagers as its natural users. The recapitulation is accompanied by the author’s linguistic and sociocultural reflections, which argue in favour of contemporary expansion of youth sociolect and its evolution from a communal variety to a culturally motivated communication style.
Classics of Children’s Literature: Definitions – Ideologies – Theoretical Concepts
Authors: Skowera Maciej
Published: September 2021

The aim of the paper is to present a discussion on the issue of classicality in relation to children’s literature and in the context of ideology, as well as to formulate a definition of literary classics for young readers based on socio-cultural and not aesthetic criteria. The author refers to representative examples of Polish and English reflection on the issue and, at the end of the article, proposes to define classical works as literary texts that, after many years from their creation, are still subjected to professional and non-professional rereading and various transformations.
Olsztyn as a Little Homeland in Board Games for Children – the Example of a Historical German Game and Polish Contemporary Games
Authors: Sapała Barbara , Sławińska Małgorzata
Published: September 2021

The aim of this study is to analyze the contents of regional board games for kids from the perspective of developing attachment to their little homeland. Two modern Polish games, Olsztyn mnie kręci (Olsztyn Turns Me On) and Przytul Olsztyn (Give Olsztyn a Hug), and a pre-war German game Spacer po Olsztynie (A Walk in Olsztyn) were examined. An attempt was made in the study to answer the following question: What image of Olsztyn has been created by the analyzed games? The theoretical framework for the study was the history of Warmia and the changing principles of education, which is currently referred to as “regional”. The selection of local buildings and facilities, and the way of their presentation, were found to be the key factors when interpreting the importance of the examined board games for strengthening the children’ bonds with their little homeland. The analysis revealed that the pre-war board game emphasized the German and monocultural character of the city, as well as its rapid development. On the other hand, Polish games depict Olsztyn as the capital city of the Warmia Region, and focus on its multicultural heritage. The games highlight the beauty of Olsztyn as a garden-city, and its tourism potential.
Ecological Humanities in Polish Studies, or about Green Reading of the Legends about Lake Gopło
Authors: Niesporek-Szamburska Bernadeta
Published: September 2021

The author considers the way in which Polish studies could contribute to meeting the obligations of ecological humanities. The analysis of excerpts from the core curriculum of the Polish language subject and the reference to Kenneth White’s geopoetics suggest that the solution at school could be the use of the green reading method in Polish lessons and the readings available in the core curriculum: legends about Lake Gopło and Popiel referring to the beginnings of Polish statehood. As the analysis of the content of the legends shows, they also have a symbolic potential connected with the water element and referring to the folk tradition. A profiled reading, exposing this content, could contribute to awakening the ecological sensitivity of pupils, which is one of the important components of their ecological awareness.
The Integrated Economic-Environmental Modeling (IEEM) Platform: IEEM Platform Technical Guides: User Guide for the IEEM-enhanced Land Use Land Cover Change Model Dyna-CLUE
Authors: Verburg Peter H. , Malek Žiga , Goodwin Sean P. , Zagaria Cecilia
Published: September 2021

The Conversion of Land Use and its Effects modeling framework (CLUE) was developed to simulate land use change using empirically quantified relations between land use and its driving factors in combination with dynamic modeling of competition between land use types. Being one of the most widely used spatial land use models, CLUE has been applied all over the world on different scales. In this document, we demonstrate how the model can be used to develop a multi-regional application. This means, that instead of developing numerous individual models, the user only prepares one CLUE model application, which then allocates land use change across different regions. This facilitates integration with the Integrated Economic-Environmental Modeling (IEEM) Platform for subnational assessments and increases the efficiency of the IEEM and Ecosystem Services Modeling (IEEMESM) workflow. Multi-regional modelling is particularly useful in larger and diverse countries, where we can expect different spatial distributions in land use changes in different regions: regions of different levels of achieved socio-economic development, regions with different topographies (flat vs. mountainous), or different climatic regions (dry vs humid) within a same country. Accounting for such regional differences also facilitates developing ecosystem services models that consider region specific biophysical characteristics. This manual, and the data that is provided with it, demonstrates multi-regional land use change modeling using the country of Colombia as an example. The user will learn how to prepare the data for the model application, and how the multi-regional run differs from a single-region simulation.
Desviación de germen dentario permanente posterior a pulpectomía obturada con óxido de zinc eugenol.
Authors: Villavicencio Inga María Belén
Published: September 2021

El óxido de zinc y eugenol (ZOE) constituye el primer material recomendado y más estudiado, hasta 2008 era el único material recomendado por la Academia Americana de Odontología Pediátrica como obturador de conductos. Sin embargo, el ZOE ha manifestado tasas relativamente menores de reabsorción o degradación en correlación a la rizólisis de los dientes primarios, causando irritación en el área periapical, necrosis de hueso y cemento y, desviación del germen del diente permanente.

Por lo tanto, el objetivo del presente artículo es constatar que el óxido de zinc eugenol, tras una extravasación y su tasa de degradación más lenta a la rizólisis de los dientes primarios, puede desviar el germen dentario permanente. Frente al diagnóstico de persistencia de los incisivos maxilares primarios a causa de extravasación y no reabsorción del material obturador (ZOE), el tratamiento inicial en el caso clínico reportado se consideró realizar la exodoncia de las unidades dentarias 5.2, 5.1, 6.1, 6.2 y la remoción de los restos de material obturador extravasado ayudar al descenso de la corona clínica de las unidades dentarias sucesoras permanentes. Cabe señalar que el material obturador (ZOE) causó, como evidencia la literatura, el desvió del germen permanente (unidad dentaria 2.1) la cual posteriormente se tratará de forma interdisciplinaria.
Complicaciones y satisfacción de pacientes rehabilitados con implantes cigomáticos en una clínica privada de Quito – Ecuador
Authors: Cedillo Bailon Marco Andrés , Sandoval Portilla Fernando , Paz y Miño Esteban
Published: September 2021

El tratamiento de maxilares atróficos mediante implantes cigomáticos fue introducido de manera inicial por Branemark en 1988, a partir de entonces se han presentado varias modificaciones en cuanto a sus indicaciones, planificación prequirúrgica y técnica quirúrgica. Siendo en la actualidad una alternativa segura y predecible a largo tiempo.

El objetivo del presente estudio fue analizar la presencia de problemas biológicos y biomecánicos, así como la satisfacción de los pacientes rehabilitados con implantes cigomáticos extrasinusales con carga inmediata para lo cual se revisó de manera retrospectiva 21 implantes cigomáticos instalados en 6 pacientes que presentaban tanto maxilares atróficos como maxilares con secuela de maxilectomia quienes fueron tratados en una clínica privada de la ciudad de Quito – Ecuador.

Los resultados de este estudio demostraron que solo un 9,52 % de los implantes presentó complicaciones biológicas, de las cuales 1 implante presento comunicación bucosinusal (4.76 %) y 2 implantes presentaron sinusitis maxilar- (9,52 % - se repite el implante afectado con la comunicación buco-sinusal); Además todos los pacientes brindaron respuestas satisfactorias en cuanto a la satisfacción general al tratamiento. Se concluye que la técnica de implantes cigomáticos extrasinusales es una técnica confiable y reproducible que genera una alta satisfacción en los pacientes.
El dual de la reflexión de un grupo topológico
Authors: Castillo Adriana C. , Hernández A. Julio C.
Published: September 2021

En este escrito presentamos un estudio de la dualidad de un grupo vía reflexiones. Iniciamos con la demostración de una condición necesaria para que el homomorfismo dual del homomorfismo que va del grupo a su reflexión sea una biyección continua, esto es, que siendo φ: G → ξ(G), sucede que φb: ξ[(G) → Gb es una biyección continua si T ∈ ξ, donde ξ es una subcategoría reflexiva de la categoría de los grupos topológicos y ξ(G) es la reflexión de G. Una vez se tenga la anterior condición se demuestra que Gb ∼= ξ[(G), cuando G es un grupo compacto, o es un grupo topológico Čech completo con φ: G → ξ(G) sobreyectiva y abierta, o un grupo topológico localmente compacto y φ: G → ξ(G) es sobreyectiva y abierta. En el caso del dual de las reflexiones de grupos topológicos metrizables, nos apoyamos en el resultado de Chasco [5] que implica que si G es un grupo topológico abeliano metrizable y H es un subgrupo denso de G, entonces los grupos duales Gb y Hb son topológicamente isomorfos.
Soluciones globales para sistema isotérmico con fuente
Authors: Wang Xian Ting
Published: September 2021

In this short note, we are concerned with the global existence of solutions to the isothermal system with source, where the inhomogeneous terms f(x,t,ρ,u)=b(x,t)ρ+(a′(x)/a(x))*ρu^2+α(x,t)ρu|u| are appeared in the momentum equation. Our work extended the results in the previous papers “Resonance for the Isothermal System of Isentropic Gas Dynamics” (Proc. A.M.S.139(2011),2821-2826), “Global Existence and Stability to the Polytropic Gas Dynamics with an Outer Force” (Appl. Math. Let-ters, 95(2019), 35-40) and “Existence of Global Solutions for Isentropic GasFlow with Friction” (Nonlinearity, 33(2020), 3940-3969), where the global solution was obtained for the source f(x,t,ρ,u)=(a′(x)/a(x))*ρu^2, f(x,t,ρ,u)=b(x,t)ρ, f(x,t,ρ,u)=α(x,t)ρu|u| respectively.
Imágenes de Gray de códigos consta-cíclicos sobre anillos de Galois R de índice de nilpotencia 3
Authors: García Ramírez Angel R. , López Andrade Carlos A. , Villa Hernández David
Published: September 2021

Estableceremos condiciones necesarias y suficientes para que la imagen bajo la función de Gray de un R-código consta-cíclico sea un Fpm-código cuasi-cíclico. Estudiamos el anillo de vectores de Witt para obtener una manera de operar las µ-reducciones de las componentes p-ádicas de los elementos de los anillos de Galois de índice de nilpotencia 3, R = GR(p3, m). Analizamos a los anillos de Galois, sus propiedades más relevantes, y en particular la representación p-ádica de sus elementos. Más adelante, examinamos la construcción del anillo de vectores de Witt y sus operaciones, en particular, obtenemos expresiones explícitas para las operaciones de suma y producto de los elementos en el anillo truncado de vectores de Witt de longitud 3, W3(Fpm). Finalmente, utilizamos las operaciones de éstos últimos y un isomorfismo entre GR(p3, m) y W3(Fpm) para operar las µ-reducciones antes descritas.
Relaciones Topológicas
Authors: Angulo Perkins Emilio , Angoa Amador Juan
Published: September 2021

A family of constructs is proposed that generalizes the notion of closure operator associated to a partial order. The constructs of the family (and some of its sub constructs) hold adjoint relations with Gconv which ensure a topological resemblance; furthermore, it is shown that the constructs are topological categories.
Algunos tipos especiales de determinantes en extensiones PBW torcidas graduadas
Authors: Suárez Héctor , Cáceres Duban , Reyes Armando
Published: September 2021

In this paper, we prove that the Nakayama automorphism of a graded skew PBW extension over a finitely presented Koszul Auslander-regular algebra has trivial homological determinant. For A = σ(R) a graded skew PBW extension over a connected algebra R, we compute its P-determinant and the inverse of σ. In the particular case of quasi-commutative skew PBW extensions over Koszul Artin-Schelter regular algebras, we show explicitly the connection between the Nakayama automorphism of the ring of coefficients and the extension. Finally, we give conditions to guarantee that A is Calabi-Yau. We provide illustrative examples of the theory concerning algebras of interest in noncommutative algebraic geometry and noncommutative differential geometry.
Internet of Things and Heterogeneous Networks Technologies: Concepts, Challenges and Perspectives
Authors: Gherbi Chirihane
Published: September 2021

The IoT network is used to provide an object with connectivity to the Internet to allow the feedback of information. The IoT has the ambition to make objects interact with each other and with people. It promises to be the engine of great transformations in the lives of individuals by democratizing new uses and services in the mobility sector. This is why it is compared to the internet of the future. The global size of the IoT, the huge number of Things in the IoT, the changing topology of the IoT, and the resource constraints make routing in the IoT difficult. Routing is a necessary process in the Internet of Things because it enables the interchange of data between Things by quickly guiding and reliably delivering data through the network from its origins to its destinations. The Internet of Things is enabled by key pillars: radio frequency identification (RFID) and wireless sensor networks (WSNs) (IoT), NFC (Near Field Communication), BLE (Bluetooth Low-Energy technology), LoRa and Sigfox. This paper examines these different technologies as well as the barriers and challenges that must be solved.
Item Response Theory Utilization for Developing the Student Collaboration Ability Assessment Scale in STEM Classes
Authors: Arlinwibowo Janu , Retnawati Heri , Kartowagiran Badrun
Published: September 2021

Collaboration is an ability that develops in STEM learning and is very influential in 21st-century life. Thus, students' collaboration abilities must be detected properly. This study aims to produce a quality and easy-to-use instrument for assessing student collaboration skills in STEM classes. The research is development research that contains three steps, namely preliminary research, making prototypes, and conducting product evaluations. Methods of data collection using FGD and questionnaires. The FGD was carried out with experts to produce descriptive data and assessment instruments as well as questionnaires which were also development products with data in the form of graded scales 1, 2, 3, and 4. The study involved 187 junior high school students who took lessons in STEM classes. The instrument is a questionnaire with 4 graded answer choices. To ensure the quality of the instrument, the researcher conducted FGD and expert validation and proved the construct with CFA. The instrument profile was traced using the unidimensional graded response model (GRM) method of response analysis. The results showed that the final instrument containing 17 items was declared valid in terms of content and constructs, as well as reliable. The results of the item analysis show that all items have good sequential step parameters (b1 < b2 < b3), all items have a good discriminant index (0.995 ≤ ai ≤ 1.764), and the instrument is reliable for measuring students with an ability range of -6.15 < θ < 4.05. Thus, this instrument can define students' abilities well in a wide range of abilities.
Study of Liver and Renal Dysfunction in Hospitalised Dengue Patients in a Tertiary Health Care Facility of Odisha
Authors: Sethy Ganeswar , Swain Abinash , Panda Abinash , Sethy Geetanjali
Published: September 2021

BACKGROUND Dengue is an acute viral haemorrhagic fever with large number of fatalities worldwide. According to WHO, 50 - 100 million infections occur annually, out of which 5 lakhs are dengue haemorrhagic fever. India is no way better like any other tropical country. Southern part of Odisha shows high prevalence of dengue cases which are referred to MKCG Medical College, Berhampur. Dengue is a vector borne disease, which is of much epidemiological importance throughout India. No clinical study has been undertaken in recent past on this disease as regard to clinical parameter, course and outcome. Hence, it was decided to carry out a study to assess the epidemiological profile of dengue patients, the prevalence and pattern of liver and kidney dysfunction and outcome of hospitalized patients in MKCG Medical College and Hospital. METHODS This cross-sectional study was carried out on laboratory confirmed dengue patients admitted to hospital in Department of Medicine, MKCG Medical College & Hospital, Berhampur from January 2018 to December 2018. RESULTS More number of patients (58 %) were male and from rural area (72 %). Alanine aminotransferase (ALT) and aspartate aminotransaminase (AST) were elevated in 68 % of cases to more than 3 times of normal. Mortality is 4 % among the admitted patient. More death observed with high international normalized ratio (INR) value. CONCLUSIONS Mortality is high in patients of dengue with deranged liver function and kidney function. Early screening of dengue patients by clinical and laboratory parameter will help clinicians to predict mortality for dengue cases. Dengue cases with liver and kidney dysfunction need aggressive monitoring and appropriate management to prevent complications and death. KEYWORDS Severe Dengue, Early Parameters, AST / ALT, Outcome, Mortality
Comparative Study of Mouriquand’s Cytological Grading with Histopathological Grading in Carcinoma Breast at a Tertiary Centre, Mandya
Authors: R. Sushrutha , Y. Muralidhar Bhat , S. Shivakumar
Published: September 2021

BACKGROUND Fine needle aspiration cytology (FNAC) has become the standard primary diagnostic method in carcinoma breast. It is also a useful tool for surgical treatment and prognosis. The present study is designed to correlate cytological grading using Mouriquand’s grading method with histological grading using modified Bloom-Richardson grading method. METHODS This was an observational study. A total of 45 cases of breast carcinoma, aged 30 to 80 years, underwent FNAC and the smears were graded using Mouriquand’s criteria. All the cases were correlated with Bloom-Richardson grade on histopathology in mastectomy specimens. RESULTS There were a total of 44 cases of infiltrating ductal carcinoma and 1 case of mucinous carcinoma on cytology. Patients’ age ranged from 30 to 80 years with a mean of 53.27 years. In terms of cytology, 15 were (33.3 %) grade I cases, 27 (60 %) grade II and 3 (6.7 %) grade III. In histopathology, 19 (42.2 %) were grade I, 21 (46.7 %) were grade II and 5 (11.1 %) were grade III. Grade I showed a sensitivity of 52.6 % and specificity of 84.6 % with positive predictive value of 71.4 % and negative predictive value of 71 %. Grade II showed a sensitivity of 76.2 % and specificity of 50.0 % with positive predictive value of 57.1 % and negative predictive value of 70.6 %. Grade III showed a sensitivity of 20 % and specificity of 95 % with positive predictive value of 33.3 % and negative predictive value of 90.5 %. Concordance rate between cytology and histology of grade I, grade II and grade III tumours was 73.3 %, 59.25 % and 33.3 % respectively. The absolute concordance rate was 62.2 %. CONCLUSIONS Thus, cytological grading of breast carcinoma correlates well with histopathological grading. In the era of multiple treatment modalities and neoadjuvant therapy, cytological grading can be used as a prognostic factor for better management of patients. KEYWORDS Breast Carcinoma, Mouriquand’s Grading, Bloom-Richardson Grading
Comparison of Upper Lip Bite Test and Ratio of Height to Thyromental Distance in Predicting Difficult Tracheal Intubation in South Indian Population – A Descriptive Study
Authors: Thayyil Baseema , Chandran Neetha Thattaparambil , Karthik Asish , Amma Maya Gomathy
Published: September 2021

BACKGROUND Failure in managing the airway is the most important cause of death in patients undergoing general anaesthesia (GA). For effectively preventing airway catastrophe it is essential to have a meticulous airway assessment pre-operatively. Many methods are in use to predict difficult airway like Mallampati, Wilson’s scoring, percentage of glottic opening (POGO) scoring, Cormack - Lehane classification, thyromental distance, mandibular hyoid distance, atlantooccipital joint extension etc. In this study, we compared between two popular methods of airway assessment, upper lip bite test (ULBT) and height to thyromental distance ratio (RHTMD) to predict the difficulty in tracheal intubation. METHODS This descriptive study was conducted at Government Medical college, Thrissur, over a period of one year , on 76 patients of American society of Anaesthesiologist (ASA) - PS l - lll, requiring general anaesthesia. ULBT and RHTMD were used to assess the patient’s airway. It was correlated with Cormack - Lehane classification during direct laryngoscopy. The data was analysed using Fisher exact test (P < 0.05) and Kappa statistics. RESULTS Out of the 76 patients, 41 (53.9%) were women 35 were men (46.1 %). ULBT predicted 89.6 % [25 + 43] belonging to class 1 and 2 as easy, while 10.5 % [8] of class 3 as difficult. RHTMD predicted 35 patients (46 %) as easy (grade 1) and 41 patients (54 %) as grade 2. Using ULBT, of the 8 patients predicted to have difficult intubation (Class 3), 2 were found practically difficult and 6 were easy. In remaining 68 patients, 23 patients had difficult view and 45 had easy view. According to Cormac and Lehane, among 41 patients who predicted difficult by RHTMD, 19 patients were practically difficult and 22 were easy. Of 35 patients, 6 patients were difficult and 29 were easy. CONCLUSIONS The RHTMD is more sensitive compared to ULBT in predicting difficult intubation. As assessed by Cormack - Lehane classification. KEYWORDS Difficult Intubation, Ratio of Height to Thyromental Distance, Upper Lip Bite Test