bluuebunny/crossref_metadata_2025 huggingface dataset:
Information technologies in accounting. prospects and problems
Authors: RATYNSKYI Vadym
Published: May 2021

The issues of application of new information technologies in accounting are considered. Peculiarities of automated accounting in the conditions of domestic reality are singled out, methodical principles of informatization of administrative activity are shown. The classification of software products used for automation of accounting is made, the rating of the most widespread programs for informatization of administrative activity in our country is resulted. The main advantages and disadvantages of using information technology in the organization of accounting are shown. Problems of automation of administrative activity at transition to the international standards are considered. A critical assessment of well-known authors and scientists of the modern level of automated accounting in economics is given. Particular attention is paid to the use of remote hardware and software resources in solving problems of informatization of management. Prospects of application in the account of the expert systems constructed on the basis of high-level software products are considered. Some problems of information protection that pose a threat to the use of information technology in management tasks are highlighted. The role of the person in the automated system of accounting, irreplaceability of experience and professionalism of the accountant at any level of development of information technologies is shown.
All this makes it possible to create a single information space for the enterprise. Studies have shown that only the integrated development of conceptual accounting models, transformed into mathematical and algorithmic models, in combination with information technology will make it possible to raise accounting to a higher level. Thus, the development of information technologies and the digitalization of the economy make it possible to change the functions performed by accounting services and transform accountants from information input operators into economists-controllers and information users.
Control aspect of modeling of transport and warehouse processes
Authors: SELISHCHEV Serhii
Published: May 2021

The paper proves the relevance of the importance and determining role of the internal control system in the design and modeling of transport and warehousing processes. The peculiarities of warehousing and transportation of the researched material are investigated and systematized. A number of methods for controlling the quantity and quality of the studied material are described, and their advantages and disadvantages are described. One of the main factors that must be taken into account when developing a design model of the transport and warehousing process is the ability of this process to conduct quality control procedures for its implementation. That is, if the process cannot be controlled, it cannot be controlled. It is necessary to take into account the cost of control procedures, in relation to the project itself. It is possible that the cost of control will exceed the cost of the project itself, which with all the forecast indicators of profitability and investment attractiveness may make its implementation impractical.
The purpose of the paper is to study the control aspect of transport and warehouse modeling.
The analysis of the scientific literature indicates the need for additional development of methodological and organizational support for internal control systems in the modulation of transport and warehousing processes. The study of this issue allowed to reveal a number of features of warehousing and transportation of certain groups of material values, on the example of the studied material – cement. There are also a number of typical methods for controlling the quantity and quality of cement in the warehouse. This approach allows us to identify the features of the control environment of this material, which must be taken into account in the transport – warehouse modeling.
Modern directions of development of financial technologies in the banking sector of Ukraine
Authors: RATS Olha , ALFIMOVA Anzhelika
Published: May 2021

Introduction. One of the factors of structural changes in the financial market of Ukraine is the growing use of the Internet and mobile devices to provide financial services. At present, it can be seen that radical changes in the field of technology have affected not only the information sphere, but also the economic one. The modern technological revolution has significantly affected the infrastructure of the banking sector, which is associated with increased automation in the work of financial institutions and greater customer focus. This encourages banks to constantly improve, introduce new products and provide services to their customers with greater speed, quality and reliability.
The purpose of the paper is to identify and study current trends and directions of development of financial technologies in the banking sector of Ukraine.
Results. The article reveals the economic essence of the concept of “financial technology”. Modern tendencies of fintech development in Ukraine are analyzed. Successful examples of the use of innovative financial technologies in the domestic banking sector in recent years are presented. Possible areas of partnership between fintech companies and traditional banks have been identified.
Conclusion. When formulating their own strategy, banks should consider the innovative vector of development as the most important way to ensure the stability of their operation, economic growth and competitiveness, as the effectiveness of their activities depends on the ability to meet the needs of consumers. Therefore, banks need to implement advanced financial technologies, as well as improve ways to provide them to their customers. Equally important is the cooperation of banks with fintech companies, which will promote the development of innovation and maintain consumer confidence in both parties.
Problematic aspects of the application of ECHR practice by the courts of Ukraine
Authors: STOROZHENKO Oleksandr , PROHOROVA Oksana
Published: May 2021

Introduction. Ukraine signed Convention for the Protection of Human Rights and Fundamental Freedoms many years ago to provide effective protection of fundamental rights for every human that stands out on its' territory. This document is interpreted by the European Court of Human Rights. Practice of this Court must be used by national courts of Ukraine to match international human rights' standards. However, according to results of statistical research, application of that legal positions by national judges aren’t correct enough.
The purpose of the paper is to identify and analyze problematic issues of application of the case law of the European Court of Human Rights by national courts of Ukraine. The authors also wanted to investigate the national practice of using the ECHR' legal positions and to provide recommendations to address shortcomings in such application.
Results. The paper considers the issue of application of the case law of the European Court of Human Rights by the national courts of Ukraine. The legal nature of ECHR decisions' is studied. Authors are stick to the idea that judgments of ECHR aren’t classic precedent. There are authors' opinions about the problem of applying the practice of the European Court of Human Rights, which has no official translation. They think that judges need to be taught professional English and French. So that they will be able to understand original text of judgments correct. There is also a thought about necessity of creating special database with Ukrainian translation of some judgments. Authors have also revealed problematic aspects of the application such as: erroneous, manipulative, formal references. There are some decisions of Ukrainian courts that have been analyzed by the authors. Erroneous references to decisions of the European Court of Human Rights in such cases have been determined. Authors stated that the reason of those defects is insufficient awareness of judges about the specifics of application legal positions of ECHR.
Conclusion. According to the results of the work, the importance of education and training of future judges is stated. In addition, authors emphasized on necessity of further observations of this question.
Current state and development prospects of Ukrainian sauce market
Authors: HOLIUK Viktoriia , MEHEL Khrystyna
Published: May 2021

Sauces play an important role in the food industry, as they occupy a significant part in the diet of many Ukrainians.
The purpose of the paper is to research current state and development prospective of state of the sauce market in Ukraine.
The study has brought the following results. The study analyzes the current state of the sauce market in Ukraine and identifies prospects of its development. In particular, it was found that the market is saturated and characterized by fierce competition. Peculiarities of demand for sauce products in Ukraine are analyzed, in particular: frequency of purchases, seasonality, dependence on demand for other products. The commodity structure of the market of sauce products of Ukraine is analyzed. It is determined that in Ukraine, in contrast to Western countries, consumption amounts of complex sauces are inferior to mono sauces – mayonnaise and ketchup. The main development trends of the sauce products market in Ukraine are indicated: growth in demand for organic products, decrease in the share of fat and high-calorie products, growth in demand for new exotic sauces. The competitive environment of the market of sauce products of Ukraine is analyzed. It is determined that the main market share belongs to large producers who have a developed distribution network and offer consumers a wide range of products and low prices. The dynamics of production and sale of products, export and import of sauces is studied. It is determined that the share of imports in the domestic market is small, as domestic consumers prefer cheap domestic products. It is substantiated that Ukraine occupies an important place among exporters of sauce products and its export volumes are growing. Perspective ways of development of the sauce products market in Ukraine are defined.
The sauce products market in Ukraine is characterized by saturation, high competition, seasonality and growing demand for organic, low-calorie and exotic products, that forces producers to diversify the product structure and expand sales in foreign markets.
The Interconnection between Students’ Emotional Intelligence and their Interpersonal Conflict Behaviours
Authors: Казаренков В.И. , Карнелович М.М. , Казаренкова Т.Б.
Published: May 2021

В статье рассматриваются проблемные вопросы эмоционально-личностной детерминации конфликтного межличностного взаимодействия.
Цель исследования — определить связь эмоциональных свойств личности студентов разного пола и стратегий их поведения в межличностных конфликтах.
Методика исследования — тестирование, методы описательной статистики, критерий сравнения U Манна — Уитни, корреляционный анализ по Спирмену.
Приведены результаты эмпирического исследования свойств эмоциональной сферы и стратегий поведения студентов в конфликтном межличностном взаимодействии. Раскрыты уровни выраженности аффективности и тревожности личности и специфические особенности поведения студентов разных полов в межличностных конфликтах.
Результаты исследования могут быть использованы при проведении мероприятий профилактической и коррекционной направленности, ориентированных на коррекцию тревожности и обучение студентов сотрудничеству и компромиссу в конфликтогенных ситуациях межличностного взаимодействия.

The article treats issues associated with emotional intelligence and interpersonal conflict behaviours.
The aim of the research is to identify the connection between male and female students’ personality traits and their interpersonal conflict behaviour strategies.
The authors employ such methods of research as testing, descriptive statistics, the Mann-Witney U test, the Spearman correlation analysis.
The article provides the results of an empirical investigation of students’ emotional intelligence and their interpersonal conflict behaviours.
The article singles out various levels of affectivity and anxiety and investigates behavioural patterns adopted by male and female students in conflict situations.
The results of the research can be used to perform preventive and corrective actions aimed at the reduction of anxiety levels in students and at teaching students to collaborate and seek compromise in interpersonal conflict situations.
“CHRONICLERS WILL NOT HARM FOR US EPITETS WITH A TINT OF RED” (epithetics “Poems from the war” by Borys Humeniuk)
Authors: BYBYK Svitlana
Published: May 2021

The article offers an analysis of one of the expressive markers of the language of social works of B. Humeniuk “Poems from the war”. Stylistic functions, structural and semantic properties of epithets are outlined. The connection between lyrical and epic epithets and the form of poems – verlibr – is noted. The functional load of epithets in correlation with linguistic-stylistic categories actualization, intimation, subjectivization, publicism, epicness, lyricism is traced.
The role of epithets as actualizers of emotional assessments, concrete-sensory associations (color, size, smell of realities, mental state, mood, worldview of a lyrical hero) in readers is established. Emphasis is placed on militarized epithet with destructive semantics of meanings. The individual-author features of actualization of epithets-coloratives (black, red, white, green, blue, yellow) are emphasized. A specific group of epic, more typical of colloquial language, epithets-pronoun adjectives, which enhance the subjectivity of the poetic context.
The originality of the epithetics of B. Humeniuk’s verlibr verse is characterized. In particular, the key proper epithet phrases with the direct meaning of adjectives and metaphorical epithets are singled out; two-syllable noun-adjective epithets, epithets as a part of an adjective inversion, epithets as a part of comparison, a paraphrase are distinguished.
The correlation of the epithet “Poems from War” with the archetypal cognitive structures – the concepts of War, Warrior, Death, Life, Man, Nature – is traced.
INTERTEXTUALITY IN THE POETIC LANGUAGE OF MAXYM RYLSKYI
Authors: PALASH Alyona
Published: May 2021

Problem’s setting. The problem of interpretation and research of the term “intertextuality” today is a topical issue of philosophy, literary criticism, linguistics, modern Ukrainian linguistic poetics, and stylistics of the text. That is, no text can be created in an empty space, it must have an intertextual relationship with other works or texts.
Analysis of recent studies. The theoretical basis for the study formed works in the field of modern linguistics, in particular, Robert de Bogrand, Alexander Veselovsky, Olga Vorobyova, Wolfgang Dressler, Alexander Potebnya considered “intertextuality” as a textual category; Yuri Lotman, Vladimir Lukin – as a prerequisite for textuality; Lyudmyla Babenko, Suren Zolyan, Larysa Omelchenko, Natalia Fateeva – as means of its implementation in specific texts.
Objective of the research. The purpose of the work is to analyze the external and internal connections of the literary text of Maksym Rylsky and the means of their realization in the explicitly intertextual process of the text’s existence.
The main part. The article studies the peculiarities of the artistic embodiment of intertextuality in the poems of Maxim Rylsky; the definition of intertext in a broad and narrow sense is traced; the classification of the intertextuality of Jennet is singled out. The focus is on the separation of language units, intertextual components in the language of Maxim Rylsky; examples and quotations, allusions, titles, epigraphs, hints, genre connection of texts, references to the pretext in the artist’s creative work are given and analyzed.
Conclusions. Research and analysis of the intertextuality of the artist’s poetics show that in a new way the comprehension and depiction of quotations, allusions, epigraphs, titles, hints, paraphrases become differential features of the individual author’s style.
Impactos da Política Nacional de Resíduos Sólidos na qualidade de vida : uma avaliação nos municípios mineiros
Authors: Rodrigues Loredany Consule Crespo , Rodrigues Cristiana Tristão
Published: May 2021

Considerando a relevância das questões ambientais e os efeitos negativos causados pela má gestão dos resíduos sólidos ao meio ambiente, o objetivo deste trabalho é avaliar os impactos da Política Nacional de Resíduos Sólidos (PNRS), instituída pela Lei no 12.305/2010, sobre a existência de lixões, o número de famílias vulneráveis e a proporção de internações relacionadas ao saneamento básico inadequado nos municípios de Minas Gerais. Para atingir este objetivo, foi utilizado como método de análise estatística o propensity score matching (PSM) e dados referentes ao ano de 2013. Os resultados encontrados revelam que, embora os impactos da política em relação à redução do número de lixões e do número de famílias que se encontram em situação de vulnerabilidade não tenham sido estatisticamente significativos, a proporção de internações relacionadas ao mau saneamento nos municípios que implementaram o Plano Municipal de Gestão Integral de Resíduos Sólidos (PMGIRS), conforme exigências da PNRS, é menor que nos municípios que ainda não possuem o plano. Conclui-se, então, que a PNRS tem gerado impactos positivos na saúde da população, melhorando a qualidade de vida, podendo afetar, inclusive, a formação de capital humano destes municípios.
A Lei do saneamento básico e seu impacto nos índices de acesso aos serviços de saneamento básicO
Authors: Afonso Damares Lopes , Almeida Eduardo Simões de
Published: May 2021

O Brasil ainda enfrenta desafios quanto ao oferecimento dos serviços de saneamento básico à população. Em busca da universalização desses serviços, o governo federal promulgou a Lei no 11.445, a chamada Lei do Saneamento Básico de 2007. Dentre as diretrizes fundamentadas pela lei, encontra-se a elaboração dos planos municipais de saneamento básico (PMSB) por parte de todos os municípios brasileiros. O presente trabalho propõe avaliar o impacto da Lei do Saneamento Básico sobre os índices de acesso aos serviços de saneamento básico relacionados ao abastecimento de água, à coleta de lixo e ao esgotamento sanitário dos municípios. Utiliza- se a combinação do modelo de diferenças em diferenças (DD) com pareamento por escore de propensão, tendo como tratamento o fato de os municípios terem elaborado seus PMSB, ou seja, estarem em conformidade com a lei. Os resultados indicam que a aplicação da lei teve impacto positivo e significativo nos índices de acesso aos serviços de coleta de lixo e esgotamento sanitário.
Toward sustainable human development in Venezuela : diagnosis, challenges and economic strategy
Authors: Rodríguez Francisco , Guerrero Guillermo
Published: May 2021

The Venezuelan crisis has become one of the most dramatic of Latin American history. Venezuela has had the worst economic contraction of the region, has been focus to a sharp increase in extreme poverty levels, and has become the country with the largest refugee crisis of the continent. As the situation deteriorated, data sources have also reduced drastically by the government, which renders it difficult to assess the complete depth of the country’s economic crisis and adds another layer of complexity. Despite the Venezuelan collapse being staggering, few academics studies have attempted to identify its causes. This article addresses this gap and aims to understand the drivers of Venezuelan economic downfall. We provide a comprehensive diagnosis of the Venezuelan collapse and suggest the means to put Venezuela back on the road of sustainable development.
Photometric Variability as a Proxy for Magnetic Activity and Its Dependence on Metallicity
Authors: See Victor , Roquette Julia , Amard Louis , Matt Sean P.
Published: May 2021

Understanding how the magnetic activity of low-mass stars depends on their fundamental parameters is an important goal of stellar astrophysics. Previous studies have shown that activity levels are largely determined by the stellar Rossby number, defined as the rotation period divided by the convective turnover time. However, we currently have little information on the role played by chemical composition. In this work, we investigate how metallicity affects magnetic activity, using photometric variability as an activity proxy. Similarly to other proxies, we demonstrate that the amplitude of photometric variability is well parameterized by the Rossby number, although in a more complex way. We also show that variability amplitude and metallicity are generally positively correlated. This trend can be understood in terms of the effect of metallicity on stellar structure, and hence the convective turnover time (or, equivalently, the Rossby number). Lastly, we demonstrate that the metallicity dependence of photometric variability results in a rotation-period detection bias, whereby the periods of metal-rich stars are more easily recovered for stars of a given mass.
The Dusty Heart of NGC 4151 Revealed by λ ∼ 1–40 μm Reverberation Mapping and Variability: A Challenge to Current Clumpy Torus Models
Authors: Lyu 吕 Jianwei 建伟 , Rieke George H.
Published: May 2021

We probe the dusty environment of the archetypical Type 1 active galactic nucleus (AGN) in NGC 4151 with comprehensive IR reverberation mapping over several decades, in the J (∼1.22 μm), H (∼1.63 μm), K (∼2.19 μm), L (∼3.45 μm), and N bands (∼10.6 μm), plus multiple measurements at 20–40 μm. At 1–4 μm, the hot dust reverberation signals come from two distinct dust populations at separate radii (∼0.033 pc and ∼0.076 pc), with temperatures of ∼1500–2500 K and ∼900–1000 K, consistent with the expected properties of sublimating graphite and silicate dust grains. The domination of the torus infrared output by carbon and silicate grains near their sublimation temperatures and radii may account for the general similarity of AGN near-IR spectral energy distributions. The torus inner edge defined by the hottest dust remains at roughly the same radius independent of the AGN optical luminosity over ∼25 yr. The emission by hot dust warmed directly by the optical/UV AGN output has increased gradually by ∼4% yr−1, indicating a possibly growing torus. A third dust component at ∼700 K does not seem to participate directly in the IR reverberation behavior, and its emission may originate deep in the circumnuclear torus. We find a reverberation signal at ∼10 μm with an inferred radius for the warm dust of ∼2.2–3.1 pc. The lack of variability at 20–40 μm indicates that the far-IR emission comes from even more extended regions. The torus properties revealed by dust reverberation analysis are inconsistent with predictions from pure clumpy torus models. Instead, the longer-wavelength emission possibly originates in a flared torus or the polar wind.
A Deep Chandra X-Ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5
Authors: Bogdanov Slavko , Bahramian Arash , Heinke Craig O. , Freire Paulo C. C. , Hessels Jason W. T. , Ransom Scott M. , Stairs Ingrid H.
Published: May 2021

We present an analysis of 745.8 ks of archival Chandra X-Ray Observatory Advanced CCD Imaging Spectrometer data accumulated between 2000 and 2016 of the millisecond pulsar (MSP) population in the rich Galactic globular cluster Terzan 5. Eight of the 38 MSPs with precise positions are found to have plausible X-ray source matches. Despite the deep exposure, the remaining MSPs are either marginally detected or have no obvious X-ray counterparts, which can be attributed to the typically soft thermal spectra of rotation-powered MSPs, which are strongly attenuated by the high intervening absorbing column (∼1022 cm−2) toward the cluster, and in some instances to severe source crowding/blending. For the “redback” MSP binaries PSR J1748−2446P and PSR J1748−2446ad and the “black widow” binary system PSR J1748−2446O, we find clear evidence for large-amplitude X-ray variability at the orbital period consistent with an intrabinary shock origin. The third redback MSP in the cluster, PSR J1748−2446A, shows order-of-magnitude variations in flux on timescales of years, possibly due to state transitions or intense flaring episodes from a magnetically active secondary star.
Detection of Al ii in the Ultraviolet Spectra of Metal-poor Stars: An Empirical LTE Test of NLTE Aluminum Abundance Calculations*
Authors: Roederer Ian U. , Lawler James E.
Published: May 2021

We report the detection of an Al ii line at 2669.155 Å in 11 metal-poor stars, using ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. We derive Al abundances from this line using a standard abundance analysis, assuming local thermodynamic equilibrium (LTE). The mean [Al/Fe] ratio is −0.06 ± 0.04 (σ = 0.22) for these 11 stars spanning − 3.9 < [Fe/H] < −1.3, or [Al/Fe] = −0.10 ± 0.04 (σ = 0.18) for 9 stars spanning −3.0 < [Fe/H] < −1.3 if two carbon-enhanced stars are excluded. We use these abundances to perform an empirical test of non-LTE (NLTE) abundance corrections predicted for resonance lines of Al i, including the commonly used optical Al i line at 3961 Å. The Al ii line is formed in LTE, and the abundance derived from this line matches that derived from high-excitation Al i lines predicted to have minimal NLTE corrections. The differences between the abundance derived from the Al ii line and the LTE abundance derived from Al i resonance lines are +0.4 to +0.9 dex, which match the predicted NLTE corrections for the Al i resonance lines. We conclude that the NLTE abundance calculations are approximately correct and should be applied to LTE abundances derived from Al i lines.
Local well-posedness for the inhomogeneous nonlinear Schrödinger equation
Authors: Aloui Lassaad , Tayachi Slim
Published: May 2021

We consider the Cauchy problem for the inhomogeneous nonlinear Schrödinger equation \begin{document}$ i\partial_t u +\Delta u = \mu |x|^{-b}|u|^\alpha u,\; u(0)\in H^s({\mathbb R}^N),\; N\geq 1,\; \mu\in {\mathbb C},\; \; b>0 $\end{document} and \begin{document}$ \alpha>0. $\end{document} Only partial results are known for the local existence in the subcritical case \begin{document}$ \alpha<(4-2b)/(N-2s) $\end{document} and much more less in the critical case \begin{document}$ \alpha = (4-2b)/(N-2s). $\end{document} In this paper, we develop a local well-posedness theory for the both cases. In particular, we establish new results for the continuous dependence and for the unconditional uniqueness. Our approach provides simple proofs and allows us to obtain lower bounds of the blowup rate and of the life span. The Lorentz spaces and the Strichartz estimates play important roles in our argument. In particular this enables us to reach the critical case and to unify results for \begin{document}$ b = 0 $\end{document} and \begin{document}$ b>0. $\end{document}
[First occurrence of Sea Lamprey, Petromyzon marinus Linnaeus 1758 (Agnatha, Petromyzontiformes, Petromyzontidae) in the River Mignone (Northern Lazio).]
Authors: Ferri Vincenzo , Crescia Paolo , Soccini Christiana , Olini Alessio , Celletti Stefano
Published: May 2021

[The spring presence of two individuals of the Sea lamprey, Petromyzon marinus, in the River Mignone near Tarquinia (Northern Lazio) could highlight a new Italian reproductive site of this rare and endangered species. This exceptional possibility could certainly be favored by the good quality of both the waters of the Mignone, and the environmental context of the record, but would require the urgent equipment of the barrier of Le Mole with a fish ladder in order to allow the sea lamprey’s upstream migration towards the areas of the upper course, even more suitable for their reproduction].

 

[Article in Italian]
Water balance for determination of excess water in soybean cultivated in lowland soils
Authors: Bortoluzzi Mateus Possebon , Gubiani Paulo Ivonir , Heldwein Arno Bernardo , Trentin Roberto , Silva Jocélia Rosa da , Nied Astor Henrique , Zanon Alencar Junior
Published: May 2021

The aim of this study was to derive a methodology for calculating a sequential water balance that accurately estimates the occurrence of excess water in soybeans cultivated in lowlands. We tested four calculation strategies of water balance associated with the simulation of soybean development, which differed on the calculation of rainfall and time of water drainage from the soil macropores. Data of volumetric moisture monitored in three soil layers throughout the soybean cycle in the 2014/15 agricultural year were used as a reference. Microporosity was used as a lower limit for the occurrence of excess water in the area. Excess water was considered to be whenever the daily volumetric soil moisture in the 0-100 mm layer was greater than 0.39 mm3 mm-3. Over the 111 days of measurement, soil moisture indicated the presence of excess water in 38 days. The traditional calculation strategy of water balance underestimated the occurrence of excess water, as well as the other strategies that considered effective precipitation in their formulas. The calculation strategy that considers that all the rainfall infiltrates in the soil and that the water from macropores is removed only by crop evapotranspiration exhibited good performance and indicated 35 days of excess water, being the most appropriate and recommended for determining excess water in lowland soybeans.
Parametric resonance of acoustic and optical phonons in GaAs/GaAsAl quantum well in the presence of laser field
Authors: Nguyen Dung Tien , Trung Le Canh , Duong Pham Thi Hoai , Phong Tran Cong
Published: May 2021

In this paper, we analytically investigated the possibility of parametric resonance of acoustic and optical phonons. We obtained a general dispersion equation for parametric ampliﬁcation and transformation of phonons. The dispersions of the resonant acoustic phonon modes and the threshold amplitude of the ﬁeld for acoustic phonon parametric ampliﬁcation are obtained. The parametric ampliﬁcation for acoustic phonons in a GaAs/GaAsAl quantum well can occur under the condition that the amplitude of the external electromagnetic ﬁeld is higher than the threshold amplitude. Full Text: PDF ReferencesB. A. Glavin, V. A. Kochelap, T. L. Linnik, P. Walker, A. J. Kent and M. Henini, "Monochromatic terahertz acoustic phonon emission from piezoelectric superlattices", Journal of Physics: Conference Series, Vol 92, (2007). CrossRef O. A. C. Nunes, "Piezoelectric surface acoustical phonon amplification in graphene on a GaAs substrate", Journal of Applied Physics 115, 233715 (2014). CrossRef Yu. E. Lozovik, S. P. Merkulova, I. V. Ovchinnikov, "Sasers: resonant transitions in narrow-gap semiconductors and in exciton system in coupled quantum wells", Phys. Lett. A 282, 407-414, (2001). CrossRef R.P. Beardsley, A.V. Akimov, M. Henini and A.J. Kent, "Coherent Terahertz Sound Amplification and Spectral Line Narrowing in a Stark Ladder Superlattice", PRL 104, 085501, (2010). CrossRef Pascal Ruello, Vitalyi E. Gusev, "Physical mechanisms of coherent acoustic phonons generation by ultrafast laser action", Ultrasonics 56, 21-35, (2015). CrossRef L. Esaki, in Proc. 17th Int. Conf. Phys. Semiconductors, San Francisco, CA, Aug, J.D. Chadi and W.A. Harrison, Eds, Berlin: Springer- Verlag, 473, (1984). DirectLink W. Xu, F. M. Peeters and J. T. Devreese, "Electrophonon resonances in a quasi-two-dimensional electron system", Phys. Rev. B 48, 1562 (1993). CrossRef Tran Cong Phong, Nguyen Quang Bau, "Parametric resonance of acoustic and optical phonons in a quantum well", Journal of the Korean Physical Society, Vol. 42, No. 5, 647-651, (2003). DirectLink
Editorial
Authors: Ofori-Adjei David
Published: May 2021

Additional Editorial Board members

The Ghana Medical Journal extends a special welcome to new members appointed to the Editorial Board. Themembers are to complement the work of the current membership of the Board.
Dynamic Modeling and Performance Analysis of PMSG- based Variable Speed WTG: Case Study of Adama Wind Farm I, Ethiopia
Authors: Muluneh Zenachew , Teame Gebremichael
Published: May 2021

In this paper, the performance of Permanent Magnet Synchronous Generator (PMSG) -based Variable Speed Wind Turbine Generator (WTG) at Adama Wind Farm I (WTG), connected to a grid is studied. To study the performance of the WTG, both machine and grid side converters are modeled and analyzed very well. On the machine side, maximum power point tracking (MPPT) for maximum energy extraction is done using the direct speed control (DSC) technique, which is linked with the optimal tip speed ratio for each wind speed value considered. On the grid side, dc-link voltage and reactive power flow to the grid are controlled. For this purpose, first, the simulation model of the system is prepared in MATLAB Simulink considering the dynamic mathematical model of the PMSG, and Wind Turbine Aerodynamic model using the user-defined function blocks. Then, the PI regulators designed for direct speed, torque (current) control, and dc-link voltage are employed in the model. Moreover, to study and analyze the behavior of the system in a variable speed operation, a wind speed starting from cut-in wind speed (3m/s) to the rated wind speed (11m/s) is applied in 4s. The simulation result of the existing system model shows that the actual values of performance variables correspond well with the analytical values of the system. In addition, the chosen control algorithms applied in the control system of the generator-side converter are hence verified.
Performance Enhancement of Natural Convection Indirect Solar Dryer by Integrating Reflectors
Authors: Teklu Hailay , Bayray Mulu , Abay Dawit , Kalamegam Millerjothi
Published: May 2021

Natural convection indirect type solar dryer integrated with reflectors that can be used for drying fruits and vegetables was designed, constructed, and evaluated. The study mainly tried to improve the performance of a prototype natural convection indirect solar dryer. The solar dryer was integrated with reflectors and its thermal performance was experimentally analyzed and results were compared with the same dryer without reflectors. The experiments conducted included a no-load test to determine the stagnation temperature that can be reached and drying tests using tomato slices. During the drying test, moisture content at the initial and final stages was measured using a moisture balance instrument. The mass of the tomato slices was measured every two hours to find the drying efficiency. Temperatures were measured using thermocouples located at the absorber plate and at the trays inside the drying cabinet. Solar radiation was also measured using a pyranometer located near the dryer. During no load experiments, the maximum temperature reached the collector was around 98oC for the dryer without reflectors. The maximum temperature was improved to around 154oC during the test with reflectors. Similar temperature improvement was obtained during the drying tests as well. Due to the improvement in the temperature in the collector, the drying rate was also improved by 8% for 10 kg and 14% for 5 kg load. The experimental results indicate that the dryer performance was improved when the reflectors were added.
Un Ejemplo del Factor Bayes Para el Contraste de Hipótesis en la Investigación de Neurología
Authors: Ramos-Vera Cristian Antony
Published: May 2021

Estimada Editora: Se recomienda la replicación de las investigaciones en ciencias de la salud basadas en la significación estadística de la hipótesis nula (NHST; p<0.05) para generar una evidencia en la investigación en Neurología con mayor credibilidad. Palabras clave: factor bayes
Epilepsia Como Factor Pronóstico de Refractariedad y Funcionalidad en Estado Epiléptico en Pacientes Mexicanos
Authors: García-Bermúdez Ricardo Jorge
Published: May 2021

Introducción: El estado epiléptico es una condición que puede ser discapacitante y mortal. El antecedente de epilepsia puede favorecer a que un paciente no progrese a estado epiléptico refractario y a que tenga un buen pronóstico funcional. Sin embargo, en la población mexicana no existen estudios al respecto. Materiales y métodos: Se realizó un estudio observacional, analítico, retrospectivo de una cohorte de pacientes atendidos con estado epiléptico en el Hospital de Especialidades del Centro Médico Nacional Siglo XXI, en México. Se evaluó la probabilidad de presentar estado epiléptico refractario y de buen desenlace funcional en pacientes con antecedente de epilepsia, realizándose chi cuadrada de Pearson. Resultados: se atendieron 40 pacientes con estado epiléptico, 32 con estado refractario y 14 con antecedentes de epilepsia. La probabilidad de presentar antecedente de epilepsia con estado epiléptico refractario fue OR 1.29 (p 0.53) y con desenlace funcional favorable de OR 3.63 (p 0.10). Conclusiones: El antecedente de epilepsia no es un factor que previene la progresión a estado epiléptico refractario ni un factor que predice un desenlace funcional favorable en el actual estudio de población mexicana. Sin embargo, se requieren estudios con mayor muestra para corroborarlo. Palabras clave: Epilepsia, estado epiléptico, factor de riesgo, funcionalidad, Pronóstico, refractariedad
Empatía: Medidas Cognitivas y Psicofisiológicas en Población Infantil
Authors: Gómez-Morales Duván Fernando , Bonilla-Santos Jasmin , Gutiérrez-Sterling Daniela , González-Hernández Alfredis , Bonilla-Santos Gisella
Published: May 2021

La empatía ha consolidado una importante trayectoria investigativa desde el siglo pasado en las neurociencias cognitivas. Desde su definición como concepto, la construcción de instrumentos de evaluación para diferentes grupos de edad y la búsqueda de dominios y vertientes que aborden este componente no ha cesado. Esta revisión se dirige a recopilar los hallazgos representativos en la historia de la conceptualización del término y el desarrollo de la medición en empatía en las poblaciones, haciendo especial énfasis en los trabajos realizados con población infantil con herramientas de autoinforme y medidas psicofisiológicas. La revisión arrojó que existe un horizonte investigativo prometedor de la mano de técnicas psicofisiológicas como el EEG para la evaluación del constructo. Se discute la necesidad de profundizar en la búsqueda de patrones en la ontogenia de la empatía en la niñez, así como en el diseño de nuevas formas de medición a través de autoinforme para la práctica investigativa en países de habla hispana que involucre las dinámicas sociales y demográficas de estas poblaciones. Palabras clave: cognition, empathy, neuropsychology
Temporal Squama Pneumatization: An Under-Recognized Limitation Of Transcranial Doppler
Authors: Del Brutto Oscar H. , Nader Juan A.
Published: May 2021

Transcranial Doppler (TCD) is a non-invasive procedure that is increasingly used for diagnostic and prognostic purposes in patients with an acute stroke. In addition, TCD enhances the effect of thrombolysis by exposing thrombi surfaces to circulating rTPA. However, insonation problems through acoustic windows limit the diagnostic efficiency of TCD. Keywords: pneumatization, Transcranial Doppler
Síndrome de Persona Rígida de Causa Paraneoplásica. Claves Diagnósticas en una Entidad Rara
Authors: Martínez-Burbano Braulio , Castro-Uquillas Eduardo , Martínez-Núñez Andrea
Published: May 2021

Introducción: Los desórdenes paraneoplásicos ejercen su efecto a través de mecanismos inmunológicos y no por invasión directa del tumor; de esta manera los tumores localizados fuera del sistema nervioso inducen la producción de anticuerpos contra antígenos: de la superficie neuronal, intracelulares o sinápticos y afectan sitios distantes de su ubicación ya sea al sistema nervioso central como al periférico produciendo de esta forma diversas manifestaciones clínicas. Uno de estos síndromes es el de Persona Rígida que, aparte de ser una entidad rara, ocurre como un síndrome paraneoplásico apenas en el 5% de casos. Caso Clínico: Hombre de 72 años con cuadro de 2 meses de evolución que inició con espasmos musculares dolorosos en la región dorsal y lumbar, evolucionando a rigidez con postura en hiperextensión axial y apendicular, marcha pseudoespástica, hipe- rekplexia; ante la sospecha de síndrome de Persona Rígida se inició el trabajo diagnóstico y se encontraron niveles elevados de Ac anti GAD65 y posteriormente un Linfoma No Hodgkin. Recibió inmunoterapia y tratamiento oncológico. Conclusión: Los síndromes paraneoplásicos deben ser identificados según el fenotipo clínico y la determinación de anticuerpos antineuronales. La alta sospecha y el diagnóstico rápido son necesarios para lograr un tratamiento oportuno y evitar injuria permanente. Palabras clave: Anticuerpos antineuronales, desórdenes paraneoplásicos, Linfoma No Hodgkin, síndrome de Persona Rígida
The effect of tax avoidance, sustainbility report, corporate governance on firm value: Leverage as moderating (Empirical Study On Registered Manufacturing Companies On the Indonesia Stock Exchange 2014-2019)
Authors: Andayani Endro , Yanti Harti Budi
Published: May 2021

Disclosure about the factors that influence firm value is the aim of this study. Tax avoidance variables, sustainability reports, corporate governance practices and leverage are thought to influence firm value. Samples were selected based on certain criteria. Therefore, data obtained from the Indonesia Stock Exchange as many as forty companies for six years (2014 to 2019). The results reveal that tax avoidance, sustainability reporting, corporate governance practices affects firm value in a negative direction. Meanwhile, leverage affects firm value in a positive direction. The effect of the sustainability report on firm value is proven not to be strengthened by the leverage variable as a moderating variable, but it does strengthen the effect of tax avoidance and corporate governance on firm value.. Originality / Value - This paper contributes to three different series of studies: the literature on government as a determinant of tax avoidance in Indonesia. For companies, evaluate, improve, improve performance. For investors, to assist in making wise judgments about the value of the firm, it is worth considering other factors and for the academy as the theoretical library used. For further research with institutional ownership variable, financial crisis as a moderating variable.
Informalidad del servicio de transporte urbano en Santiago de Cali, Colombia: aspectos de interés
Authors: Noguera Campo Asebes
Published: May 2021

Uno de los principales derechos de un país es la libre movilización por el territorio nacional, dicha movilización se puede realizar por diferentes medios que le permitan a la población en general ir a sus lugares de trabajo y desplazarse para cumplir con sus necesidades básicas cotidianas. Es así entonces que es el Estado el garante por intermedio de su normatividad vigente quien regula el transporte público y privado de pasajeros y que dicho derecho constitucional se cumpla a cabalidad en el territorio nacional. Por tal razón, esta investigación tiene como propósito describir aspectos generales sobre la informalidad del servicio del transporte urbano en la ciudad de Cali, cuya situación se presenta como consecuencia de la falta de transporte público de pasajeros en el área urbana. La naturaleza del estudio es de carácter descriptivo, documental; con referentes bibliográficos tales como: La Constitución Política de Colombia, Los Lineamientos del Ministerio de y Transporte, Ortega y Melo (2017), Botero y Alegría (2017), García (2016), Gómez (2011), Moller (2003), y otros autores. Los resultados revelan a) la falta de cubrimiento en el servicio de transporte público de pasajeros en la totalidad de la ciudad de Cali, b) el crecimiento del transporte urbano informal de pasajeros en la ciudad de Cali, c) el transporte urbano informal de pasajeros es un medio de transporte alternativo en los lugares donde no llega este tipo de transporte público de pasajeros y que era prestado por el transporte tradicional que hoy ya está a punto de desaparecer.
Gestión de proyectos comunitarios dirigidos por el Consejo Federal de Gobierno
Authors: Romay Vega Jhonathan , Ortega Moreno Jean
Published: May 2021

El presente artículo tiene como objetivo describir las fases de la gestión de proyectos comunitarios dirigidos por el Consejo Federal de Gobierno de la parroquia Antonio Borjas Romero de Maracaibo, Venezuela. Se sustenta en autores clásicos como Cunill (1991), Fadda (1990), Ceballos (2009), entre otros. El tipo de investigación es descriptiva, ubicada en el nivel de conocimiento perceptual, con un diseño como fuente mixta, evolutivo retrospectivo y univariable. La población estuvo conformada por diecinueve consejos comunales representados por sesenta informantes. El análisis se realizó a través de un cuestionario de veinte preguntas con escala de cinco alternativas y para el cálculo de la confiabilidad se utilizó el Coeficiente Alfa de Cronbach, el cual arrojó un resultado de 0,93. Se concluye que existe un mediano cumplimiento de las fases para la gestión de los proyectos comunitarios; asimismo, para los voceros, responsables y miembros de la asamblea de los consejos comunales estas fases representan fortalezas, mientras que para los analistas del Consejo Federal de Gobierno son debilidades. Se recomienda la participación activa de todos los miembros integrantes de los consejos comunales para subsanar las deficiencias encontradas y a su vez vigilar la actualización de cada una de las actividades desempeñadas por ellos.
Silvio Romero, a escrita da história e o papel do homem de letras na formação nacional brasileira
Authors: Silva Daniel Pinha
Published: May 2021

O artigo trata da produção intelectual de Silvio Romero (1851-1914) destacando o modo como ele delineia o papel do homem de letras do tempo presente oitocentista na formação nacional brasileira. O autor elege o conceito de literatura para problematizar a produção do conhecimento sobre o Brasil e, mais do que isso, a forma pela qual o homem de letras deve agir com as palavras para a construção de uma independência mental brasileira. Tal reflexão assegura, também, um lugar próprio ao homem de letras, agindo na fronteira entre o mundo civilizado europeu e o contexto nacional.
Uma tarde com Vanzolini e amigos no Butantan
Authors: Calleffo Myriam Elizabeth Velloso
Published: May 2021

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Holocausto ecológico em Itaipu e na Amazônia: trabalhadores (as), ditadura e conflito agrário do Sul ao Norte do Brasil
Authors: Sanfelice de Paula Cátia Franciele
Published: May 2021

O artigo problematiza a relação entre a Itaipu Binacional, a ditadura militar e a questão agrária na Amazônia, com ênfase nos problemas enfrentados pelos trabalhadores (as) desapropriados (as) pela estatal. Para isso, utilizo fontes de imprensa e registros produzidos pelo Serviço Nacional de Inteligência da ditadura militar, SNI, que tratam, em especial, dos conflitos no Acre e em Rondônia. Discuto a omissão e a truculência do Estado com rela ção aos conflitos agrários, do Sul ao Norte do país e como imobiliárias particulares atuaram nesse processo

convocando trabalhadores do Paraná para a Amazônia. Destaco a falta de alternativas e as dificuldades de acesso à terra pelos trabalhadores frente à s mudanças provocadas pelas relações sociais capitalistas materializadas na construção da Hidrelétrica de Itaipu e nos projetos de “colonização” na região Norte do país