bluuebunny/crossref_metadata_2025 huggingface dataset:
Patterns of Forming Entrepreneurial Intention: Evidence in Vietnam
Authors: Khoi Nguyen Huu , Tuu Ho Huy , Olsen Svein Ottar , Le Angelina Nhat-Hanh
Published: March 2021

The purpose of this study is to explore the direct and interaction effects of entrepreneurial events (feasibility and desirability) and perceived risk (opportunity and threat) on entrepreneurial intention in a transitional economy – Vietnam. The testing results show that perceived desirability and perceived feasibility have direct and interactive effects on entrepreneur intention. Risk as both threat and as opportunity has direct and moderating effects on entrepreneurial intention.
Selective hydrogenation of light cycle oil for BTX and gasoline production purposes
Authors: Olmos-Cerda Eli H. , Laredo Georgina C. , Pérez-Romo Patricia , Águeda-Rangel Ricardo , García-López Alfonso
Published: March 2021

The study of the best experimental conditions and catalyst for the hydrogenation (HYD) of light cycle oil (LCO) for upgrading purposes was carried out. The objective was to examine the ability of two commercial hydrotreatment (HDT) catalysts for selective aromatic saturation. The effect of the hydrotreatment operation parameters (temperature, pressure, liquid hourly space velocity, H2/HC ratio) on the sulfur and nitrogen contents and in the saturation of aromatic hydrocarbons was also investigated. The goal was to obtain the highest conversion to mono-aromatic hydrocarbons from this di-aromatic (naphthalene derivatives) type feedstock, and at the same time to get reasonable hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) performance to avoid contaminant hydrocarbons for the next step (usually hydrocracking, HCK). An appropriate hydrotreated product with the highest concentration of mono-aromatic derivatives, a minimum reduction on the total aromatic content, and suitable decrements of sulfur and nitrogen compounds, was achieved using a cobalt-molybdenum supported on alumina catalyst, at 330 °C, 5.5 MPa, and a liquid hourly space velocity of 1.1 h−1. Additionally, the kinetics of the HDA was studied, assuming a lump characterization into tri-, di- and mono-aromatic and aliphatic hydrocarbons, pseudo-first-order reaction rates between these conversions, and thermal losses and diffusional resistances to be undetectable.
Prognostic significance of TRIM28 expression in patients with breast carcinoma
Authors: Zhang Wen , Cai Zhengquan , Kong Mingzhu , Wu Anqi , Hu Zeyang , Wang Feng , Wang Hua
Published: March 2021

Background

Tripartite motif 28 (TRIM28) plays a role in multiple biological functions. The expression and function of TRIM28 in breast carcinoma (BC) remain unclear. The aim of this study was to explore potential association of TRIM28 with tumor features and survival.

Materials and methods

Specimens were collected from BC and adjacent normal tissues. Quantitative reverse transcription PCR (RT-qPCR) and immunohistochemistry (IHC) were performed to detect TRIM28 expression. The correlation of TRIM28 with clinicopathological features was evaluated by Chi-square test. The relationship between TRIM28 expression and survival was further analyzed by the Kaplan-Meier and Cox regression method. A receiver operating characteristic (ROC) curve was used to assess the value of TRIM28 in predicting BC.

Results

In this retrospective research, it was demonstrated that TRIM28 was overexpressed in BC tissues. TRIM28 overexpression was correlated with lymph node metastasis, advanced TNM stage, and poor molecular subtype. The survival analysis showed that overall survival (OS) and progression-free survival (PFS) were significantly shorter in TRIM28-positive group. Moreover, TRIM28 was an independent prognostic factor for BC. And ROC analysis verified the diagnostic role of TRIM28 in BC.

Conclusions

TRIM28 is overexpressed in BC and might be a promising prognostic and diagnostic biomarker of BC.
Amazonian worlds of other-than-human beings and the Apurinã through the materiality of oral stories
Authors: Virtanen Pirjo Kristiina , Apurinã Francisco , Facundes Sidney
Published: March 2021

This article looks at what origin stories teach about the world and what kind of material presence they have in Southwestern Amazonia. We examine the ways the Apurinã relate to certain nonhuman entities through their origin story, and our theoretical approach is language materiality, as we are interested in material means of mediating traditional stories. Analogous to the ways that speakers of many other languages who distinguish the entities that they talk to or about, the Apurinã make use of linguistic resources to establish the ways they interact with different entities. Besides these resources, the material means of mediating stories is a crucial tool to narrate the worlds of humans and nonhumans. Storytelling requires material mediation, and a specific context of plant substances. It also involves community meeting as a space of trust in order to become a communicative practice and effectively introduce the history of the people. Our sources are ethnography, language documentation, and autoethnography.
The effect of microwave irradiation on heterogeneous catalysts for Fischer–Tropsch synthesis
Authors: Mbuya Christel Olivier Lenge , Jewell Linda L. , Ntelane Tau S. , Scurrell Mike S.
Published: March 2021

The work that has been carried out on microwave irradiation applied in catalyst preparation for drying, calcination or postsynthesis methods, and as a heating source for the Fischer–Tropsch reaction has been reviewed. It has been found that microwave irradiation can, in some cases, greatly enhance the performance of heterogeneous catalyst systems for Fischer–Tropsch synthesis. We have also summarized the advantages and drawbacks of using microwave irradiation in Fischer–Tropsch catalyst preparation and postsynthesis, and identified opportunities for future investigation.
Die Fabelhaften Fünf: Wie ausländische Akteure das Maduro-Regime in Venezuela stützen
Authors: Rendon Moises , Fernandez Claudia
Published: March 2021

Das Maduro-Regime wäre heute nicht mehr an der Macht, wenn es nicht von fünf Verbündeten gestützt würde: Russland, China, Kuba, Iran und Türkei. Russland und Venezuela haben eine langjährige finanzielle, politische und diplomatische Partnerschaft. China ist ein starker – wenn auch leiser – Unterstützer des Maduro-Regimes, aber es hat in den letzten Jahren seine wirtschaftlichen Projekte in Venezuela zurückgefahren. Iran und Venezuela pflegten seit der Regierungsübernahme von Chávez eine symbolische und von hochtrabender Rhetorik geprägte Partnerschaft. Im vergangenen Jahr haben sie als zwei auf der Weltbühne weitgehend isolierte Staaten einen gemeinsamen Nenner gefunden. Kuba ist existenziell abhängig von Venezuela, hat aber auch weiterhin enormen Einfluss auf die regimetreuen Nachrichtendienste, das venezolanische Militär und die ideologische Rhetorik des Regimes. Die Türkei ist ein relativ neuer Partner des Regimes und unterstützt den unerlaubten Goldhandel Venezuelas.
Vorgehen zur Entwicklung einer Predictive Maintenance-Lösung
Authors: Schuh Günther , Kelzenberg Christoph , Helbig Jens , Graberg Tim
Published: March 2021

In der Serienproduktion sind Ausfälle von Blechumform-, Spritzguss- oder Druckgusswerkzeugen aktuell unvorhersehbar, sodass Produktionsstillstände entstehen, die in hohem Maße Anlagenverfügbarkeit und Produktionskosten beeinflussen. Aufgrund dieses starken Einflusses gewinnt die vorausschauende Wartung – Predictive Maintenance genannt – zunehmend an Bedeutung. Ziel ist es, Störfälle an Produktionsanlagen noch vor ihrem Eintreten zu prognostizieren, um vorbeugend Instandhaltungsarbeiten durchführen und hohe Kosten vermeiden zu können bzw. Produktivitätssteigerungen zu realisieren. Für die erfolgreiche Implementierung einer Predictive Maintenance-Lösung in einen Produktionsprozess muss diese anwendungsfallspezifisch ausgestaltet werden. Hierfür liefert die Studie „Predictive Maintenance“ des Werkzeugmaschinenlabors WZL der RWTH Aachen einen Handlungsleitfaden zur unternehmerischen Umsetzung.
Ko-Produktion industrieller Dienstleistungen
Authors: Austerjost Maximilian , Kreyenborg Alexander , Kiklhorn David , Azkan Can , Graefenstein Julian , Hefft Daniel , Henke Michael
Published: March 2021

In der Ko-Produktion industrieller Dienstleistungen verbergen sich enorme Potenziale. Es fehlt jedoch an einer einheitlichen Sprache, die eine effiziente und sichere Vernetzung von unterschiedlichen Unternehmen auf Netzwerkebene ermöglicht. Der Beitrag präsentiert den Lösungsansatz der Sealed Services. Unter Wahrung der Datensicherheit, -souveränität und -integrität können hierdurch kooperative Dienste über das Internet, vor allem durch kleine und mittlere Unternehmen, eigenständig entwickelt und umgesetzt werden.*)
Reifegradbasierte Bewertung der Anforderungen einer erfolgreichen MES-Einführung
Authors: Namneck Antonia , Böning Christian , Stonis Malte
Published: March 2021

Der Einsatz eines Manufacturing Execution Systems (MES) kann viele Vorteile für Unternehmen bieten, doch stellt die Einführung häufig eine große Herausforderung dar. Determinierend für eine erfolgreiche Einführung sind die Bestimmung notwendiger Anforderungen, deren Erfüllung durch das Unternehmen sowie deren Berücksichtigung im Einführungsprozess. In diesem Beitrag wird die Entwicklung einer reifegradbasierten Methode für die Bewertung und Verbesserung der unternehmensindividuellen Erfüllung der Anforderungen einer MES-Einführung vorgestellt.*)
ZrC-Impregnated Titanium-Based Coating as an Effective Lubricating Barrier for Artificial Hip Prosthesis
Authors: Malkiya Rasalin Prince R. , Selvakumar N. , Arulkirubakaran D. , Christopher Ezhil Singh S. , Chrispin Das M. , Bannaravuri Praveen Kumar , Mercy Russelin Prabha R. , Aldrin Raj J. , Jeen Robert R. B.
Published: March 2021

The important properties of implant materials are extended component life, wear resistance, and biocompatibility. The wear characteristics depend, for implant materials, on the nature of the implant, movement of joints, and usage of the part. Hard ceramic Ti-6Al-4V-2ZrC (Titanium (Ti), Aluminium (Al), Vanadium (V), Zirconium Carbide (ZrC)) was coated over stainless steel (SS) 316L for analyzing the wear and mechanical properties against E-52100 steel balls sliding for artiﬁcial hip joints. The coating crystallography was examined by X-ray diffraction analysis and the topography was inspected by an Atomic Force Microscope (AFM). The coating thickness has been measured as 5–6 µm using a scanning electron microscope (SEM), and the smooth surface roughness of 0.03 µm was measured using AFM. The Ti-6Al-4V-2ZrC coated surface nanohardness has been enhanced three times higher than uncoated. The ball-on-disk wear was investigated with a load of 2–3 N, sliding distance 110 m, and sliding velocity 0.25–0.95 m/s. The investigated wear rates are mostly higher than 10−5 mm3/Nm, and the frictional coefﬁcient reduces from 0.8 to 0.35. The morphology of worn surfaces was analyzed using SEM. Based on the improvement in nanohardness, it is concluded that the Ti-6Al-4V-2ZrC coated SS 316L is a good replacement for an artiﬁcial hip joint because of its better wear resistance and coefﬁcient of friction.
Evaluation of Fire Resistance for a Recycled 0.15 mass% Carbon Steel
Authors: Nagai Kotobu , Terayama Satoru
Published: March 2021

A recycled steel with 0.2 % offset stress higher than 295 MPa was verified as a candidate for fire-resistant use, based on an academic standard in Japan. The chemical compositions were 0.15 mass% carbon-0.02 mass% silicon-0.5% mass% manganese and unavoidable alloy elements. The amount of elements inevitably contained in recycling was kept within the regulation, and then the dispersion of tensile properties among hot coils was controlled to be sufficiently small. The recycled steel satisfied the requirements by the academic standard in terms of tensile properties at elevated temperatures. No significant evolution was observed in the ferrite-based microstructure within the temperature and time range tested. The plastic deformation is apparently a strain-controlled one up to 400°C and a strain rate-controlled one at 600°C and 700°C. At 500°C, it is in the middle of the two. In the adopted test method, a constant strain rate was realized over the entire strain range except for the beginning stage of deformation. A peak strain rate occurs at about 0.2 % strain, which brings about the uncertainty in determination of 0.2 % offset stress at elevated temperatures. However, the constant strain rate requirement is satisfied in the determination of 1 % offset stress that the academic standard specifies.
Landesparlamente im unitarischen Bundesstaat: „Machtlosigkeit“ und „unheilige Allianz“
Authors: Reutter Werner
Published: March 2021

Gemeinhin gelten Landesparlamente im bundesdeutschen Föderalismus als quantité négligeable. Ihre Macht scheint, so die überwiegende Auffassung, eng beschränkt, weil im unitarischen Bundesstaat deutscher Prägung alle wichtigen Entscheidungen auf zentralstaatlicher Ebene getroffen werden und die Volksvertretungen in den Bundesländern nicht wirkmächtig an der Staatsleitung beteiligt sind. Die empirische Analyse zeigt allerdings, dass von einem kontinuierlichen Macht- und Einflussverlust der Landesparlamente nicht die Rede sein kann. Weder hat sich der „legislative Gestaltungsraum“ der Bundesländer stetig verkleinert noch kann davon gesprochen werden, dass Landesparlamente auf Gesetzgebung ohne Einfluss bleiben.
Judith N. Shklar (2017): Der Liberalismus der Rechte
Authors: Strasser Michaela
Published: March 2021

n/a
Influence of the Cement Dust on Ants Grouping (Hymenoptera, Formicidae)
Authors: Mykytyn Tetiana , Dolynko Nelia , Stefurak Vasyl , Bielova Natalia , Kuzenko Vasyl
Published: March 2021

Research of the influence of cement dust in zone of PJSC “Ivano-Frankivskcement” on the ants grouping was conducted. In this exploration was noticed that at the anthropogenic load disappears ants of the genus Formica, which are replaced by species of the genus Lasius and Myrmica.

Analyzing the distribution of ants genera and species on experimental meadows, we found a direct correlation between the ants number and distance from the sources of cement dust (r=0.87 at p<0.05). The largest number of the ant species observed in the area of influence from the genus Lasius. Myrmica nests are found not closer than 1 km from PJSC “Ivano-Frankivskcement”, Formica nests are only in the control. Under the action of cement dust on biotopes, the ants display a non-adaptive reaction. The analysis of changes in the population density of the particular genera showed that the nests density of all genera is minimal on the meadows located near the sources of cement dust. With remoteness from the source of pollution, the density of colonies reliably increases (r=0,97 at p<0,05). Colonies of the genus Formica (F. fusca) registered only in control reached the density of grouping 1,5±1,1 nests at 100m the accounting route. For the forest biotopes, the nests density of the genus Lasius is higher in control by 1.8 times (3.1 nests/25 m2) than in the village (1.75 nests/25 m2). For other genera (Camponotus, Myrmica and Formica), an opposite reaction was registered. The nests density of F. fusca, which are registered only in the control, reached 2.5 ± 1.1 nests for 100 m the accounting route.

With a decrease in the pollution degree, the proportion of underground nests increases (r=0,90 at p<0,05), the proportion of the dome nests decreases (r=-0,94 at p<0,05). At the same time, the size of dome on average decreases when removed from the source pollution. All nests registered in the most polluted zone consist of a mixture of cement dust and earths up to 45 cm high. About 75 % of all nests found were heavily overgrown. When excavating the nests the dome was as if cemented.

Adaptation of the ants to the influence of cement dust differs from other influence types and is expressed in the fact that in technogenic territories nests are more often dome-shaped, smaller diameter and considerably higher nests than those located in the control zone. This is because the soil near PJSC “Ivano-Frankivskcement” is covered with a layer of the lime dust which reaches 5 cm.

Lasius niger is resistant to various forms of the anthropogenic influence, which can be explained by the adaptive features of the forms ant nest.
Anatomical Structure of Polygonatum Mill. Species in the Precarpathian Region
Authors: Riznychuk Nadia , Gniezdilova Victoria
Published: March 2021

Polygonatum Mill. species are found in woods of the temperate zone of the Northern Hemisphere. There are four species growing in Ukraine, the most common of which is Polygonatum multiflorum (L.) All. In forest and shrub habitats are also widespread Polygonatum odoratum (Mill.) Druce., Polygonatum latifolium Desf. and Polygonatum verticillаtum (L.) All. Polygonatum species have rhizomes of the sympodial type. They are of a primary anatomical structure. In the primary growth of the stem, as well as rhizomes, there is the central cylinder (stele) and the cortex. The structure of the leaf blade is related to the performance of basic functions: photosynthesis, respiration and transpiration. The leaves are isolateral with a lighter adaxial and shaded abaxial sides. The leaf is covered with epidermis. Beneath the epidermis is chlorenchyma, which makes up the leaf pulp - mesophyll.

The microscopic structure of Polygonatum multiflorum (L.) All. was studied. The anatomic description includes the characteristic of rhizomes, leaves and stems structure.
Generalized Path Optimization Problem for a Weighted Digraph over an Additively Idempotent Semiring
Authors: Junsheng Duan  , Dichen Hu
Published: March 2021

In this paper, a generalized path optimization problem for a weighted digraph (i.e., directed graph) over an additively idempotent semiring was considered. First, the conditions for power convergence of a matrix over an additively idempotent semiring were investigated. Then we proved that the path optimization problem is associated with powers of the adjacency matrix of the weighted digraph. The classical matrix power method for the shortest path problem on the min-plus algebra was generalized to the generalized path optimization problem. The proposed generalized path optimization model encompasses different path optimization problems, including the longest path problem, the shortest path problem, the maximum reliability path problem, and the maximum capacity path problem. Finally, for the four special cases, we illustrate the pictorial representations of the graphs with example data and the proposed method.
Max Weber and the Modern Plebiscitary Democracy
Authors: Shcherbak Svetlana
Published: March 2021

The paper offers an interpretation of one of the most controversial concepts of Max Weber: the plebiscitary leader democracy (Führerdemokratie). In particular, it considers Weber’s views on the role of parliament and his assessment of democracy. The question of why the types of legitimate domination do not include democratic legitimacy is discussed, and the author also shows the connection between the conception of plebiscitary democracy and Weber’s theory of bureaucracy. The presentation is not limited to the historical and philosophical analysis of Weber’s views. The main goal of the article is to show how the scientist’s ideas have again become relevant in modern politics. Weber’s concept of plebiscitary democracy is applicable both to analyzing the distortion caused by the crisis of traditional party politics in established democracies and to describing modern personalistic regimes, the legitimacy of which popular elections of a national leader confirm.
Targeted scientific research and transformation in the professional activity of the scientist
Authors: Ryzhko Larysa
Published: March 2021

Modern science is increasingly focused on research that solves specific technological problems. In the world literature there are different, but generally similar, names for such studies. For example, German and Russian researchers use the term «problem-oriented research», the names «mission-oriented research», research as a response to «great challenges» and «frontier research», «science mode 2» are also used. In Ukraine, particularly in the National Academy of Sciences of Ukraine, the name «targeted research programs» and «targeted scientific (scientific and technical) projects» are used. The article analyzes features of targeted research and the status of the obtained knowledge. It emphasizes their direct involvement in the social sphere — economic, political, social relations in general, because they are the basis of modern technology and their development is interested in the general public — producers and consumers of material goods. The knowledge obtained in these studies is knowledge «to order», which requires a solution to the relationship between basic and applied research, the principles of professional activity of scientists, «academic freedoms», changes in epistemological, socio-humanitarian principles of science as a social institution. In the professional activity of a scientist, the praxeologization of science requires an orientation on the humanity of the produced knowledge, which, in fact, is a combination of knowledge about nature with knowledge about human. In this case, the scientist must be an expert in related disciplines. The organizers of targeted research solve this situation through the collective implementation of research, or, as expressed by R. Florida, the use of «social intelligence». At the same time, the latter requires from the scientist, as a specialist, not only purely professional competencies but also individual psychological skills of work (creativity) in an interdisciplinary team (mutual assistance, tolerance, empathy, etc.) and interaction with the transdisciplinary community. Otherwise, the profession of a scientist becomes socially engaged in terms of competencies and activities, and the leader in the research team performs moderative rather than directive functions. Although targeted research programs are becoming widespread, leading in solving urgent practical problems, but in the scientific field, a balance must be maintained between research «to order» and research that will be the basis for future development of science and society.
Renominative logics with extended renomination, equality and predicate complement
Authors:   Taras Shevchenko National University of Kyiv, M.S. Nikitchenko , O.S. Shkilniak ,   Taras Shevchenko National University of Kyiv, S.S. Shkilniak ,   Taras Shevchenko National University of Kyiv, T.A. Mamedov ,   Taras Shevchenko National University of Kyiv
Published: March 2021

A new class of program-oriented logical formalisms is investigated – renominative logics with extended renominations, equality predicates, and predicate complement composition. Composition algebras and languages of such logics are described; their semantic properties are investigated. For these logics, a number of logical consequence relations are proposed and investigated, in particular, the logical consequence relations with undefinedness conditions. Properties of these relations form the semantic basis for further construction of sequent-type calculi for the proposed logics.
Investigation of the dynamics of the some class of neuronet represented by weeknonlinear difference systems
Authors:   Taras Shevchenko National University of Kyiv, D.Y. Khusainov , A.V. Shatyrko ,   Taras Shevchenko National University of Kyiv,   Brno University of Technology, B. Puzha ,   Brno University of Technology, V. Novotna ,   Brno University of Technology, V.A. Pylypenko ,   Brno University of Technology,   National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Published: March 2021

The article is devoted to dynamic processes in the field of artificial intelligence, namely in the tasks of neurodynamics. The problems of stability of transient processes in neural networks, which dynamics can be described by systems of weakly nonlinear difference equations, are considered. Conditions are formulated in terms of the direct Lyapunov method.
Realización monetaria, trabajo privado y forma del valor
Authors: Guzmán Raya Antonio Lebeo
Published: March 2021

La integración del dinero a las teorías del valor es uno de los aspectos que recientemente han tomado mayor relevancia teórica, aunque no existen modelos que hayan dado con una solución —si existe— generalmente aceptada que modele agentes privados en un sistema competitivo y descentralizado. Para el caso de la crítica de la economía política es un tema que fue planteado por Marx, con aciertos y errores. Esta investigación sugiere retomar la teoría monetaria de Marx, pero por un camino heterodoxo o más bien crítico; a saber, los movimientos de mercancías se desprenden del dinero, este no como mercancía, el cual viene a señalar que el dinero antecede lógicamente al valor, cuyo aspecto el marxismo más insistente no estaría dispuesto a aceptar. Con ello la esterilidad teórica sepulta uno de los aspectos más importantes del análisis de Marx: la socialización de agentes privados en un mercado descentralizado con la posibilidad de “un salto mortal” de la mercancía, dicha idea es lo que se rescata en esta investigación.
Clasificación de estados de salud y metodologías de valoración de preferencias para el cálculo de AVAC: una revisión de literatura
Authors: Espinosa Acuña Oscar Andrés
Published: March 2021

Este trabajo tiene por objetivo identificar los principales instrumentos de medición de estados de salud y las metodologías de valoración de preferencias que se utilizan para calcular los años de vida ajustados por calidad —AVAC—. A partir de una revisión de literatura con una estrategia de búsqueda equilibrada para la identificación de referencias bibliográficas relevantes, se presentan las características técnicas de los sistemas de clasificación en salud, como lo son los conceptos funcionales —sociales, mentales, físicos y sensoriales—, la combinación de atributos, el número de estados de salud diferentes, la duración de la encuesta y su administración. Asimismo, referente a las metodologías de valoración de preferencias, se resumen las particularidades sobre la consistencia con la teoría de los AVAC, la flexibilidad en la descripción de estados de salud, los estados peores que la muerte, entre otros aspectos. Se concluye que no existe un sistema de clasificación de estados de salud o método de valoración de preferencias mejor que otro, por lo que el investigador debe elegir la herramienta que mejor se adapte a la condición bajo análisis y al diseño de estudio en específico.
Un mundo digital.Territorio, segregación y control a inicios del siglo XXI.
Authors: Melo Alarcón Laura Rocío
Published: March 2021

Jeffer Ángel Chaparro MendivelsoBogotá: Departamento de Geografía, Facultad de Ciencias Humanas,Universidad Nacional de Colombia, 2017, 358 pp.
Entre juegos de autenticidad, idealización y cuidado de sí en Facebook
Authors: Soto Flechas Juan Lisandro
Published: March 2021

El artículo mostrará cómo, en la construcción de los perfiles de Facebook de jóvenes universitarios en Bogotá, se puede evidenciar un juego que atraviesa dinámicas de autenticidad y, simultáneamente, idealización de sí mismo. Se mostrará cómo este juego está enmarcado en una lógica que Foucault denominaría una “ética del cuidado de sí”, que supone una preocupación sobre las formas de construcción de sí. La metodología fue cualitativa, y se utilizaron la entrevista, la etnografía virtual y el análisis de las fotos de perfil.
Personas mayores y usos de tecnologías de la información: develamiento de brechas, sentidos y afectos en Valparaíso
Authors: Cabrera del Valle Rodrigo , Salum Alvarado Sara , Fuster Sánchez Nicolás
Published: March 2021

El propósito de este estudio mixto concurrente fue describir y comprender el uso de los significados atribuidos a las tecnologías de la información y la comunicación de las personas mayores de la comuna de Valparaíso, Chile. Se aplica un abordaje metodológico que contempla técnicas mixtas de recolección de datos. En la etapa cuantitativa se aplicó un instrumento a una muestra probabilística para medir el uso de estas tecnologías, evidenciando la alta relación entre su uso y nivel educacional, y para la etapa cualitativa, mediante grupos focales, se abordaron los significados y representaciones presentes. Los resultados concluyeron que las personas mayores valoran las relaciones personales directas sobre aquellas mediadas por tecnologías.
Power and performance analysis of light bicycle on different road profiles
Authors: Kalkat Menderes
Published: March 2021

Nowadays, digital technology and measurement are improving to measure some systems in accurate conditions without errors. From these improvements and developments, it is necessary to analyse performances and condition of bicycle and biker before high level computations. In this experimental investigation, a high quality and very light bicycle and a well-equipped trained biker were trained to test the system with different road and region conditions. The purpose of this investigation is to predict unwanted conditions of bicycle before computations and activity. Otherwise, this kind of experimental trained testing will give some information from unwanted bicycle accidents. Moreover, in this experimental work, a power meter and measurement instrument with sensors are used to measure real time parameters. As can be concluded from experimental results and the analysis, the proposed work has a good design and analysis for good material bicycles. The displacement analysis is also outlined with load of a 63 kg biker.
Nitrogen form and root division modifies the nutrimental and biomolecules concentration in blueberry (Vaccinium corymbosum L.)
Authors: LEAL-AYALA Oliver G. , SANDOVAL-VILLA Manuel , TREJO-TÉLLEZ Libia I. , SANDOVAL-RANGEL Alberto , CABRERA-DE LA FUENTE Marcelino , BENAVIDES-MENDOZA Adalberto
Published: March 2021

Blueberry (Vaccinium corymbosum L.) continues to gain importance in the international market due to its effects on the prevention of human diseases. This leads to the need to optimize the production and quality of the fruit. The present research evaluated the effect of NO3- and NH4+, using the split roots technique, in the nutritional status, photosynthetic pigments and total sugars in blueberry leaves. A completely random experiment was established with six greenhouse treatments: three under homogeneous root conduction (HR) and three with split roots (SR). The concentration of N, P, K, Ca, Mg, S, Fe, Cu, Zn, Mn, B and Na, chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoids (Car) and total sugars were evaluated in the leaves. The exclusive supply of NH4+ led to the largest accumulation of N, P, Mg, S, Cu, Mn and B, compared to plants treated with NO3-. The Chla and total sugars were higher with NH4+ compared to NO3- nutrition. The supply of N separately (SR) had no positive effects on the evaluated variables, however, the SR with half of N, in the form of NH4+, compared to the non-SR with full application of N, has no differences in N-leaf concentration, which implies a higher use in the uptake or accumulation of this macro element in plant. V. corymbosum L. with split root and half of N in the form of NH4+, doubled the N use efficiency, as it matches in yield the complete supply treatment of N-NH4+ without root division.
Establish real-time monitoring models of cotton aphid quantity based on different leaf positions in cotton seedlings
Authors: LIN Jiao , XU Jing-Cheng , MA Lu-Lu , YAN Tian-Ying , YIN Cai-Xia , LV Xin , GAO Pan
Published: March 2021

Cotton aphids, Aphis gossypii glover, are major pest threats to cotton plants, leading to quality and yield loss of cotton. Rapid and accurate evaluation on the occurrence and quantity of cotton aphids can help precision management and treatment of cotton aphids. The occurrence rules of cotton aphids on different leaf positions in cotton seedling stage for two cultivars of cotton were studied. The quantity of cotton aphids in the whole cotton seedlings were predicted based on the single leaf cotton aphid quantity. The correlation analysis results showed that cotton aphids of single leaf were significantly and positively correlated with the infected time, the all leaves of the whole plant, the whole plant contained all leaves and branches. The variance analysis results showed that cotton aphids of single leaf were significant difference with the extension of infected time. Based on different leaf positions, monitoring models were constructed respectively. The modelling set’s determination coefficient of ‘Xinluzao-45’ was greater than 0.8, while ‘Lumainyan-24’ was greater than 0.6. The best monitoring leaf position was the third for ‘Xinluzao-45’, the sixth for ‘Lumianyan-24’. From the data analysis, we can realize that it is feasible to construct a monitoring model based on the occurrence of cotton aphid in one leaf in cotton seedling, and different cotton varieties have different leaf positions. This will greatly reduce the investment of manpower and time.
Inoculation with Clariodeoglomus etunicatum improves leaf food quality of tea exposed to P stress
Authors: CAO Jin-Li , SHAO Ya-Dong , ZOU Ying-Ning , WU Qiang-Sheng , YANG Tian-Yuan , KUČA Kamil
Published: March 2021

The present study aimed to evaluate the effect of an arbuscular mycorrhizal fungus (AMF), Clariodeoglomus etunicatum, on leaf food quality and relevant gene expression levels of tea (Camellia sinensis cv. ‘Fuding Dabaicha’) seedlings exposed to 0.5 μM P (P0.5) and 50 μM P (P50) levels. Twenty-four weeks later, the seedlings recorded higher root mycorrhizal fungal colonization in P50 than in P0.5. AMF-inoculated tea plants represented significantly higher leaf fructose and glucose contents and lower sucrose content than non-inoculated plants, irrespective of substate P levels. AMF treatment also increased total amino acids content in P0.5 and P50, accompanied with higher expression of glutamate dehydrogenase (CsGDH) and lower expression of glutamine synthetase (CsGS) and glutamine oxoglutarate aminotransferase (CsGOGAT). The total flavonoid content was higher in mycorrhizal versus non-mycorrhizal plants under P0.5 and P50, together with induced expression of phenylalanine ammonia-lyase (CsPAL) and cinnamic acid 4-hydroxylase (CsC4H). Mycorrhizal fungal inoculation improved catechins content, which is due to the up-regulated expression of flavanone 3-hydroxylase (CsF3H), flavonoid 3'-hydroxylase (CsF3'H), dihydroflavonol 4-reductase (CsDFR), leucoanthocyanidin reductase (CsLAR), anthocyanidin reductase (CsANR), and chalcone isomerase (CsCHI) under P0.5. However, under P50, the gene involved in catechins synthesis was not affected or down-regulated by mycorrhization, implying a complex mechanism (e.g. nutrient improvement). AMF also inhibited the tea caffeine synthase 1 (CsTCS1) expression regardless of P levels. Therefore, the results of this study concluded that inoculation with C. etunicatum improves leaf food quality of tea exposed to P stress, but the improved mechanisms were different between P0.5 and P50.
Characterization the coding and non-coding RNA components in the transcriptome of invasion weed Alternanthera philoxeroides
Authors: ZHU Yongxing , JIANG Xinchen , HAN Xiaowen , HAN Shuo , CHEN Zhongyi , YIN Junliang , LIU Yiqing
Published: March 2021

Alternanthera philoxeroides is a notorious invasive weed worldwide, but it still lacks a genome information currently. In this study, we collected 4 groups of A. philoxeroides Illumina RNA-seq data (62.5 Gb) and performed a comprehensive de novo assembling. Totally, 421,372 unigenes were obtained with a total length of 230,842,460 bp, with 43,430 (10.31%) unigenes longer than 1000 bp. Then 119,222 (28.3%) unigenes were functional annotated and 235,885 (56.0%) were grouped into reliable lncRNAs reservoir. Besides, 534 tRNA and 234 rRNAs were identified in assembly sequences. Additionally, 131,624 microsatellites were characterized in 106,761 sequences. Then SSR primers were developed for the amplification of 40,752 microsatellites in 36,329 sequences. The miRNAs are key post-transcriptional regulators, about 86 candidate miRNA sequences were detected from A. philoxeroides assembly, and miRNA target genes prediction revealed possible functions of them in growth and development as well as stress responding processes. These results provide a vital basis for sequence-based studies of A. philoxeroides in the future, especially gene function analysis.
EXPLORAÇÃO SEXUAL DE CRIANÇAS E ADOLESCENTES: REFLEXÃO SOBRE O PAPEL DA ESCOLA
Authors: Campos Denise Carvalho , Urnau Lílian Caroline
Published: March 2021

RESUMO Este artigo analisa o papel da escola no enfrentamento da Exploração Sexual de Crianças e Adolescentes, com base em um estudo realizado em unidades de ensino da rede pública estadual de Porto Velho-RO, município que nos últimos anos convive com as consequências sociais da construção de usinas hidrelétricas no Rio Madeira. A investigação foi desenvolvida por meio de entrevistas semiestruturadas, da qual participaram 20 agentes escolares, vinculados a quatro instituições de ensino. A análise das informações foi realizada à luz de referenciais críticos sobre direitos humanos, educação e psicologia, por meio da construção de categorias e subcategorias. Os resultados revelam que a maioria dos agentes escolares desconhece a problemática e que nenhuma das escolas pesquisadas desenvolve ações de enfrentamento. A educação sexual não é trabalhada como um tema transversal e a sexualidade é reduzida ao enfoque do risco e vitimização, não entendida sob a perspectiva dos direitos humanos.
Avaliação do Sistema de Vigilância do Programa Nacional de Imunizações - Módulo Registro do Vacinado, Brasil, 2017
Authors: Silva Aline Almeida da , Teixeira Antonia Maria da Silva , Domingues Carla Magda Allan Santos , Braz Rui Moreira , Cabral Cibelle Mendes
Published: March 2021

Resumo Objetivo Avaliar o Sistema de Vigilância em Imunizações considerando-se o módulo Registro do Vacinado, do Sistema de Informações do Programa Nacional de Imunizações, Brasil, 2017. Métodos Estudo descritivo, utilizando-se do Guidelines for Evaluating Public Health Surveillance Systems, publicado pelo Centers for Disease Control and Prevention (CDC/Atlanta/GA/United States), para avaliar os atributos de simplicidade, flexibilidade, qualidade dos dados, sensibilidade, oportunidade e utilidade do sistema para seis vacinas do calendário de vacinação da criança. Resultados O Sistema de Vigilância em Imunizações foi considerado complexo em sua descrição, flexível às mudanças no calendário vacinal, de baixa qualidade dos dados para as vacinas DTP e rotavírus, de aceitabilidade regular, com alta sensibilidade para a vacina BCG, inoportuno para a vacina contra hepatite B e útil às finalidades do Programa Nacional de Imunizações. Conclusão Qualidade dos dados, aceitabilidade e oportunidade não apresentaram resultados satisfatórios, sendo necessárias ações pelo aprimoramento do sistema de informações.
Outcomes of primary fusion in high-energy Lisfranc injuries at a tertiary state hospital
Authors: Panchoo P , Wiegerinck Jl , Boskovic V , Laubscher M , Maqungo S , McCollum G , Dey R
Published: March 2021

ABSTRACT BACKGROUND: High-energy Lisfranc injuries are relatively uncommon but can lead to severe disability and morbidity. Primary fusion is a treatment option that can improve outcomes and reduce the reoperation rate. The aim of this study was to evaluate our series of primary fusions for high-energy Lisfranc injuries, looking specifically at type of fusion, time to union, non-union rates, reoperation rates and quality of reduction METHODS: Patients who underwent surgery for Lisfranc injuries were identified from the REDCap surgical database and then retrieved from records. Only cases of primary fusion in adults were included. We excluded low-energy sprains and athletic injuries, ipsilateral lower limb injuries and cases where reduction and fixation were done. Radiographs were analysed from the iSite Enterprise PACS system (Philips® RESULTS: Between 2013 and 2018, 12 cases of high-energy Lisfranc injuries were identified where primary fusion was done. Seven patients (58%) underwent fusion of the first, second and third tarsometatarsal (TMT) joints. The first and second TMT joints were fused in only one case (8%), and the second and third TMT joints were fused in four cases (33%). Only one patient (8%) had removal of implants. Compression plating was the technique of choice used for fusion. There was l0o% union rate and average time to union was 84 days. Acceptable reduction was observed in nine cases (75%). Three cases (25%) of malreduction were found, among which one patient had pre-existing hallux valgus CONCLUSION: The majority of patients who underwent primary fusion of at least one TMT joint had good radiological outcome. Further studies with better clinical follow-up are needed Level of evidence: Level 4 Keywords: Lisfranc, tarsometatarsal, outcome, fusion
The outcome of first metatarsophalangeal joint arthrodesis using a locking compression plate
Authors: Meijer JG , Grabe JC , Greyling P
Published: March 2021

ABSTRACT BACKGROUND: Arthrodesis of the first metatarsophalangeal joint (MTPJ) is a common and frequently performed procedure in the practice of orthopaedic foot and ankle surgery. Fusion techniques and preferred surgical implants have significantly evolved during recent years. It is however still under debate which surgical device provides the best outcome. One of the modern techniques described includes the use of a dorsal anatomical locking plate. These plates are usually used in combination with an additional compression cross screw across the arthrodesis site. The aim of this study was to assess the outcome of arthrodesis of the first MTPJ using a dorsal locking plate without making use of additional compression cross screw fixation. METHODS: We retrospectively assessed data at an orthopaedic practice specialising in foot and ankle surgery. All patients who had a first MTPJ arthrodesis with an anatomical locking plate system between 2010 and 2016 were identified. No additional compression cross screw fixation was done in any of these cases. Standard standing dorsoplantar and lateral X-rays of the foot were taken six weeks after surgery. As a primary objective, these radiographs were assessed to determine the rate of radiological union. As a secondary objective, any other complications that occurred in the post-operative period were recorded. RESULTS: We included 115 patients in the study. Fifteen of these patients underwent bilateral first MTPJ arthrodesis surgery, making the total number of feet included in the study 130. Of these, 86% (n=99) were female and 14% (n=16) were male. The mean age at the time of surgery was 54.7 years (range 37-74). An observed radiological union rate of 97% at three months after surgery was recorded. A total of four cases (3%) presented with symptomatic non-union. Two of these were successfully revised and progressed to union before the nine-month follow-up. One patient had bilateral surgery for severe rheumatoid arthritis with poor bone quality. No union was achieved even after a revision procedure with bone grafting. A Keller-type resection arthroplasty was eventually performed in this patient. Another secondary complication that was recorded is an overall infection rate of 2%. CONCLUSION: The results of this retrospective study suggest that high union rates and a low incidence of complications can be expected when fusing the first MTPJ with the use of a locking plate system without the need for an additional compression cross screw Level of evidence: Level 4 Keywords: first metatarsophalangeal joint, fusion, arthrodesis, locking plate, union
The VAT Treatment of Cryptocurrencies in South Africa: Lessons From Australia
Authors: Ruddy Kabwe
Published: March 2021

Cryptocurrencies are revolutionary digital currencies used by people on a peer to peer network. Cryptocurrencies are predominantly used as a payment method in business transactions. However, challenges arise with cryptocurrency borne transactions due to the lack of universal accepted classification of cryptocurrencies, the result of which leads to unintended tax consequences for cryptocurrency users. This article examines the recent amendment to the Value-Added Tax (VAT) 89 of 1991 pertaining specifically to the VAT treatment of cryptocurrencies in South Africa. Currently, transactions in cryptocurrencies are deemed to be financial services in South Africa. This means that a supply of any cryptocurrency in South Africa is exempt from VAT. This article makes a comparison with the Australian legislative framework to determine how cryptocurrencies are treated for VAT/GST purposes in that country. Although the move to regulate cryptocurrencies is welcomed, this article argues that cryptocurrency activities are incorrectly legislated as financial services in the VAT Act.
Characteristics of the Special Physical Fitness of Paddlers at a Distance of 200 m
Authors: Diachenko Andrii , Rusanova Olga , Guo Pengcheng , Kong Xianglin , Huang Zijian , Guo Jia
Published: March 2021

The aim of the study. The overall goal of this manuscript was to gain a better understanding of differences in the level of functional support for special endurance for paddlers of uniform groups (in terms of sports qualification): men kayakers, men canoeists, and women kayakers who specialize in a distance of 200 m.

Material and methods. 20 qualified paddlers’ level of functionality is being assessed, among them are a group of elite athletes, the members of the Chinese national team and winners of the 2018 Asian Games.

Results. The  important feature of the analysis is the evaluation of the structure of the ergonomic power of a 30-second maximum load. Estimating the average value of the ergometric power of work for 25-30 seconds of operation in accordance with the average power of the entire 30-second load made it possible to determine the ratio of the anaerobic alactic and lactic abilities of the athletes, taking into account the requirements of a 200-meter race for canoe and kayak paddlers. 

A significant range of individual differences in the indices of reactive properties of the cardiorespiratory system, which are determined by the ratio of the partial pressure of СО2 and the maximum level of pulmonary ventilation (VE/PaCO2) during the10 and 30 second test task, attracts attention.

The range of VE/PaCO2 indicators was: the relation of partial pressure СО2 to pulmonary ventilation in the 10 s test – 2.3 ± 0.8 for men kayakers; 2.3 ± 0.7 for men canoeists; 2.2 ± 0.5 for women kayakers;  the relation of partial pressure СО2 to pulmonary ventilation in the 30 s test – 3.9 ± 1.0 for men kayakers; 3.8 ± 1.1 for men canoeists; 3.6 ± 0.7 for women kayakers.

Conclusion. The results of the study indicate differences in the level of functional support for special endurance for paddlers of uniform groups (in terms of sports qualification): kayakers and canoeists who specialize in a distance of 200 m.