bluuebunny/crossref_metadata_2025 huggingface dataset:
EFFECTS OF USING SEAWATER IN THE MIXING AND CURING OF CONCRETE
Authors: Moussawel Hadeel
Published: June 2020

The U.N. evaluates that in 2050 the world population will increase about three point five billion, mostly in evolving countries that have underwent potable water crises. Furthermore, over half of the world population will unable to provide sufficient amounts of drinking water. Consequently, it is absolutely crucial to study ways to save freshwater. The use of seawater, which accounts for 97 percent of all the water present on Earth, is very essential. This thesis studies the use of seawater instead of freshwater in the mixing and curing of structural concrete in order to reduce future water shortage and aid in the evolution of concrete technology. Concrete mixed and cured with seawater is studied in terms of fresh and hardened properties. Results include an expected early accelerated rate of gain in compressive strength and presumably no direct effect on the rate of corrosion of reinforcement when compared to concrete mixed and cured with freshwater. Also, the type of concrete’s effect was studied by using ordinary Portland cement (OPC) and by partial replacement of OPC with Blast-Furnace Slag Cement (BFSC).
EFFECT OF SUPERABSORBENT PARTICLE SIZE ON RHEOLOGY AND MECHANICAL PERFORMANCE OF CEMENT MORTARS
Authors: Fořt Jan , Hotěk Petr , Mildner Martin , Černý Robert
Published: June 2020

The risk of crack propagation and autogenous shrinkage pose a significant weakness for concrete structures and substantially limits its lifespan. To overbridge related issues, the smart superabsorbent polymers (SAP) can be utilized to mitigate autogenous shrinkage and promote self-healing ability. However, incorporation of highly swelling particles struggles with the workability of the fresh mixture and thus final mechanical performance. Within this paper, the effect of SAP particle size is studied and correlated with the results of flow table test to propose an optimal relationship between the amount of SAP dosage, water/cement ratio and mechanical properties in the hardened state. The reference cement mortar mixture is modified by 0.25, 0.5 and 0.75 wt.% admixture of different 3 grades of SAPs thus the fresh mixture workability, basic material properties, compressive and flexural strength parameters are determined. The obtained results provide guidelines for the efficient design of SAP modified cement mortars mixtures with desired functional properties.
Nanomateriales celulósicos para la adsorción de contaminantes emergentes
Authors: Sulbarán Rangel Belkis Coromoto , Madrigal Olveira Abigail Eloísa , Romero Arellano Víctor Hugo , Guzmán González Carlos Alberto
Published: June 2020

Contexto: En la actualidad la nanotecnología posee múltiples áreas de acción que, debido a su naturaleza, la misma puede instrumentarse con amplia versatilidad, dado que, gran cantidad de avances en nanotecnología basan sus estudios en cómo optimizar procesos cotidianos e industriales y en cómo favorecer al medio ambiente. Aunado a ello, la manipulación de la materia a este nivel permite crear soluciones con mayor proyección en impacto científico, social y económico. Para fines de esta investigación, se mostrarán resultados a nivel de laboratorio usando nanomateriales celulósicos para la adsorción de contaminantes emergentes tipo antibióticos.

Método: Esta investigación se realizó a nivel de laboratorio, en donde se modificó por métodos químicos celulosa para obtener nanocelulosa por oxidación. Se realizó una caracterización de material obtenido por técnicas de espectroscopia y se evaluó la adsorción de contaminantes emergentes tipo antibiótico como la ciprofloxacina.

Resultados: Los nanomateriales celulósicos tienen potencial para ser usados en tratamiento de agua terciario en la eliminación de contaminantes emergentes como la ciprofloxacina. Los resultados muestran que el nanomaterial celulósico adsorbe la ciprofloxacina en un 27 %.

Conclusiones: Las membranas de nanocelulosa tienen potencial para ser usadas en un sistema de purificación de agua; aquellas echas solo con celulosa presentaron un menor porcentaje de adsorción del contaminante que las membranas con nanocelulosa.
Zinc Deficiency as a Reversible Cause of Heart Failure
Authors: Rosenblum Hannah , Bikdeli Behnood , Wessler Jeffrey , Gupta Aakriti , Jacoby Daniel Louis
Published: June 2020

Zinc, an essential micronutrient, affects the heart by modulating cardiomyocyte oxidative stress and maintaining myocardial structure, among other mechanisms. In cross-sectional studies, patients with heart failure have often had zinc deficiencies, suggesting effects on the ongoing pathogenesis of heart failure. Low plasma and myocardial zinc levels may cause reversible cardiomyopathy in patients who have nutritional deficiencies.

We present the case of a 24-year-old woman with anorexia nervosa and new-onset heart failure whose depressed left ventricular systolic function improved after zinc supplementation. To our knowledge, this is the first report of low plasma zinc levels as the chief cause of cardiomyopathy that resolved after zinc supplementation.
Transcatheter Coil Embolization in 17 Patients with 22 Coronary Artery Fistulas
Authors: Ates Ismail , Kaya Zeynettin , Mutlu Deniz , Akyildiz Zehra I. , Korucuk Necmettin , Karaaslan Doruk C. , Kulaksizoglu Sibel , Cilingiroglu Mehmet
Published: June 2020

Coronary artery fistulas are rare anomalies that often become symptomatic with age. They are typically diagnosed incidentally during coronary angiography. The chief nonsurgical treatment is transcatheter coil embolization. We evaluated the outcomes of this procedure in 17 symptomatic patients who had 22 fistulas in total.

The 9 men and 8 women (mean age, 52 ± 16.5 yr; range, 27–74 yr) presented at 4 Turkish hospitals from October 2008 through March 2015. Three patients had multiple fistulas. Twelve fistulas originated from the right coronary artery and 10 from the left coronary artery, draining into the pulmonary artery in 18 instances. We evaluated results postprocedurally and after 2 to 5 months, defining angiographic success as a flow better than Thrombolysis in Myocardial Infarction grade 2 in the treated artery.

Twenty-one of the 22 procedures immediately produced the targeted flow. We observed 2 minor and no major complications. On follow-up, 3 symptomatic patients underwent successful repeat treatment of one fistula each. We found that transcatheter coil embolization afforded good success rates with few complications in closing coronary artery fistulas. We share our experience to add to the data on treating patients with coronary artery fistulas, and to raise awareness among clinicians.
Warm Blood Cardioplegia for Myocardial Protection: Concepts and Controversies
Authors: James Taylor M. , Nores Marcos , Rousou John A. , Lin Nicole , Stamou Sotiris C.
Published: June 2020

Warm blood cardioplegia has been an established cardioplegic method since the 1990s, yet it remains controversial in regard to myocardial protection. This review will describe the physiologic and technical concepts behind warm blood cardioplegia, as well as outline the current basic and clinical research that evaluates its usefulness. Controversies regarding this technique will also be reviewed. A long history of experimental data indicates that warm blood cardioplegia is safe and effective and thus suitable myocardial protection during cardiopulmonary bypass surgeries.
Social Relationship Between Kampong Gendong Residents and Gated/Non-Gated Community in Sendangmulyo Village Tembalang District, Semarang
Authors: Susanti Retno , Widjajanti Retno , Wungo Grandy Loranessa , Budiarti Intan
Published: June 2020

Population growth in the city of Semarang increases the need for residential land, shifting individuals from the center to the suburbs. Tembalang is a sub-district with a population growth of 3.69%. The trend in population growth is used to build gated homes, for middle and upper class individuals who need more comfortable, secure, quiet housing. However, the existence of a gated community makes a physical separation between community settlements. Privatization of public spaces in gated housing potentially leads to social inequality and lack of interaction with the surrounding community. The purpose of this study was to examine the social relations between the villagers around housing and residents of the gated community. The study uses questionnaires and open interviews interviews with 93 respondents from Kampong Gendong and a hierarchical analysis to examine social relations. The results show that there are social relations between gated housing residents and villagers based on residence, and they carry out several activities together. Also, housing typology influences the strength of the interaction between villagers and residents of the gated homes. In general, gated housing appear as a form of exclusive property with separate environmental facilities, which might be used by villagers to strengthen social interaction. The relations with the surrounding community play n important role in increasing the sense of security for residents of gated housing, unlike the use of perimeter fence or the guards.
Výzkum v didaktice biologie, geologie a environmentální výchovy v České republice v letech 2008-2018
Authors: Kroufek Roman , Jáč Martin , Janštová Vanda , Pražáková Martina , Čiháková Kateřina
Published: June 2020

Primárním cílem studie je popsat trendy v českém výzkumu v didaktice biologie, geologie a environmentální výchovy v období mezi lety 2008–2018. Sekundárním poté komparace těchto trendů se zjištěními učiněnými zahraničními autory při rozboru národních i mezinárodních výzkumů v oblasti didaktik přírodních věd, zejména biologie. Pro naplnění tohoto cíle byla provedena obsahová analýza 148 textů daného zaměření vydaných v časopisech se standardním recenzním řízením. Nejvíce příspěvků bylo publikováno v časopisech Envigogika a Scientia in educatione, které se přímo soustředí na environmentální výchovu, resp. didaktiku přírodních věd. V analyzovaných textech převažovaly výzkumy s kvantitativním designem, respondenty byli nejčastěji žáci druhého stupně základních škol. Teoretické studie jsou v českém prostředí zastoupeny málo, stejně jako studie věnované kurikulu. Výzkumné statě byly relativně často věnovány evaluaci, případně badatelsky orientované výuce. Dobrou zprávou pro didaktiku biologie a environmentální výchovy je kromě tradice oborových konferencí a existence dvou oborově didakticky zaměřených doktorských studijních programů i to, že zaměřením výzkumů nevybočuje z mezinárodních trendů.
Vliv atraktivity kontextu matematické slovní úlohy na řešitelský proces
Authors: Havlíčková Radka
Published: June 2020

Výzkumy zabývající se řešením matematických slovních úloh poukazují na to, že rozdíly v úspěšnosti nejsou dány pouze rozdílnou úrovní kognitivních schopností žáků, ale že svou roli sehrává také motivace. V této studii jsme se proto zaměřili na kontext, jakožto nematematickou složku slovní úlohy, a zjišťovali jeho vliv na úspěšnost žáků při jejím řešení. Sledovaným aspektem kontextu byla jeho potenciální atraktivita – zjišťovali jsme, zda žáci budou úspěšnější v řešení slovních úloh s prvky pohádky, science fiction a humoru než v úlohách se stejnou strukturou, ale s neutrálním kontextem. Žáky 5. a 6. ročníku základní školy (n5 = 623, n6 = 291) jsme rozdělili do dvou výkonově srovnatelných skupin a každé z nich předložili jednu z variant – atraktivní nebo neutrální. Pro vyhodnocení výsledků kvantitativního šetření jsme použili Item Response Theory, která nám umožnila sledovat obtížnost úlohy v závislosti na latentní schopnosti jednotlivých žáků a poskytla informaci o diskriminačních vlastnostech úloh. Kromě úspěšnosti jsme v rámci kvalitativního šetření zjišťovali také rozdíly v oblasti řešitelských strategií a chyb. Ukázalo se, že atraktivní kontexty mohouza určitých podmínek vést ke zvýšení snahy žáků o jejich vyřešení a v některých případech i k mírnému zvýšení úspěšnosti řešení. Studie také ukázala, že při variování kontextů úloh je obtížné zachovat ostatní parametry úlohy beze změn, které by se odrážely v náročnosti situačního modelu úlohy, a upozornila na určitou nekonzistenci výsledků některých výzkumů.
Sprzedaż wina w ramach lokalnych systemów żywnościowych na przykładzie prawa włoskiego
Authors: Kapała Anna
Published: June 2020

The purpose of the considerations is to determine in what forms under Italian law wine producers-farmers may sell wine directly to consumers it it meets the criteria of local food systems. In this respect, the regulations on direct sales, so-called “wine routes,” agro-tourism, and farmers’ markets, as well as the “agricultural products from zero kilometres” indications have been analysed. It has been established that Italian laws allow selling wine in all the forms of the short supply chains analysed in the study. Legal provisions in this respect govern farmers and the agricultural products they produce, both unprocessed and processed, including wine. What is more, there is a special instrument created to support the sale of wine in short supply chains – “wine routes” while the Law on Agritourism explicitly allows the serving of wine produced on a given farm. All these represent a form of implementing the idea of local food systems where the conditions such as close proximity between the place of production and the place of sale, direct or close social relationship between the producer and the consumer, the lack of intermediaries or the participation of only one intermediary, are satisfied.
Real-time terahertz meta-cryptography using polarization-multiplexed graphene-based computer-generated holograms
Authors: Rajabalipanah Hamid , Rouhi Kasra , Abdolali Ali , Iqbal Shahid , Zhang Lei , Liu Shuo
Published: June 2020

As one of the cutting-edge technologies in advanced information science, wave-based cryptography is a prerequisite to enable a plethora of secure encrypting platforms which can be realized by smart multiplexing techniques together with suitable metasurface holograms (meta-holograms). Here, relying on the polarization multiplicity and re-writability of a computer-generated meta-hologram, a fully secure communication protocol is elaborately developed at the terahertz spectrum to host unique merits for exploring real-time metasurface-based cryptography (meta-cryptography) where highly restricted access of information is imposed. The proposed meta-cryptography exploits two dynamic near-field channels of a meta-hologram whose information can be instantaneously re-written without any polarization rotation and with high contrast and acceptable frequency bandwidth. The computer-generated meta-hologram is constructed based on the weighted Gerchberg–Saxton algorithm via a two-dimensional array of vertical graphene strips whose anisotropic reflection is merely determined by external biasing conditions. Several illustrative examples have been presented to demonstrate the perfect secrecy and polarization cross-talk of the proposed meta-cryptography. Numerical simulations corroborate well our theoretical predictions. As the first demonstration of dynamic THz meta-cryptography, the meta-hologram information channels can be deciphered into manifold customized messages which would be instrumental in data storage systems offering far higher data rates than electronic encryption can deliver.
Broadband metamaterials and metasurfaces: a review from the perspectives of materials and devices
Authors: Jung Joonkyo , Park Hyeonjin , Park Junhyung , Chang Taeyong , Shin Jonghwa
Published: June 2020

Metamaterials can possess extraordinary properties not readily available in nature. While most of the early metamaterials had narrow frequency bandwidth of operation, many recent works have focused on how to implement exotic properties and functions over broad bandwidth for practical applications. Here, we provide two definitions of broadband operation in terms of effective material properties and device functionality, suitable for describing materials and devices, respectively, and overview existing broadband metamaterial designs in such two categories. Broadband metamaterials with nearly constant effective material properties are discussed in the materials part, and broadband absorbers, lens, and hologram devices based on metamaterials and metasurfaces are discussed in the devices part.
Enhanced two-photon photoluminescence assisted by multi-resonant characteristics of a gold nanocylinder
Authors: Movsesyan Artur , Lamri Gwénaëlle , Kostcheev Sergei , Horneber Anke , Bräuer Annika , Meixner Alfred J. , Fleischer Monika , Zhang Dai , Baudrion Anne-Laure , Adam Pierre-Michel
Published: June 2020

Multi-resonant plasmonic simple geometries like nanocylinders and nanorods are highly interesting for two-photon photoluminescence and second harmonic generation applications, due to their easy fabrication and reproducibility in comparison with complex multi-resonant systems like dimers or nanoclusters. We demonstrate experimentally that by using a simple gold nanocylinder we can achieve a double resonantly enhanced two-photon photoluminescence of quantum dots, by matching the excitation wavelength of the quantum dots with a dipolar plasmon mode, while the emission is coupled with a radiative quadrupolar mode. We establish a method to separate experimentally the enhancement factor at the excitation and at the emission wavelengths for this double resonant system. The sensitivity of the spectral positions of the dipolar and quadrupolar plasmon resonances to the ellipticity of the nanocylinders and its impact on the two-photon photoluminescence enhancement are discussed.
Fear, Humanity and Managing the Heritage of War
Authors: Jambrešić Kirin Renata
Published: June 2020

Using the concepts of affective community (Ahmed 2015; Hutchison 2016) and affective management of “war heritage” (Logan and Reeves 2009; Gegner and Ziino 2012; Lončar 2014; Stublić 2019), the article examines how social subjects in Western Slavonia – a microlocation with many places of memory and a dense accumulation of historical traumas within them – are constructed as resisting and/or conforming to the dominant hegemonic policy of remembering the Homeland War as the “cornerstone of reasoning” in Croatia (Blanuša 2017). The examples analysed range from the activities of a local “memory agent” and the founder of a digital archive of local history to the reception of a book of testimonies and a documentary on the humanity of Pakrac’s medics in the war (Lessons on Humanity, 2017 and 2019). Based on these examples, I identified different strategies of cultural, pedagogical and ideological re-presentation and re-animation of local war heritage in the social and digital environment. These strategies are different responses to the fear that the feeling of social connection to war events and veterans as symbols of national unity and pride has been ebbing away. However, there has also been a noticeable shift on the Croatian (semi-)periphery from a ceremonial commemorative culture to a digital culture of memory of war, fostered by affective communities which transcend local, ethnic and generational boundaries. The second shift is semantic – the tendency to replace victimological and triumphalist war narratives with those of “humanitarian heroism” and positive war stories about humanity, about helping and rescuing people from the “enemy side”. In conclusion, even though the Croatian “social framework of memory” (Halbwachs 2013) offers different models for transforming fear, pain, violence and the trauma of war into “cultural heritage”, only individuals remember and feel, and very few among them become memory agents and activists of “mnemonic resistance” (Molden 2016) with a significant role in the struggles over the meaning of the past.
The Silence of Fear, Silencing by Fear and the Fear of Silence
Authors: Marković Jelena
Published: June 2020

Although the aim of this paper is primarily to provide a theoretical contribution to our understanding of silence, it is also based on an ethnographic study conducted in Lika, a region of Croatia marked by a history of conflict and violence. Silence, in addition to having diverse functions and effects, is also characterised by different durations (it can be measured in seconds as well as in decades). It can be, and often is, filled with other potentially communicable non-verbal aspects (emotions and affects, gestures, sounds, etc.). It can also be more or less dependent on – and even steered by – the opinions, experiences and viewpoints of other individuals and communities. In short, this paper deals with the silences found in the course of the research within the framework of numerous typologies of silence, focusing on contextually dependent and ambivalent effects of silence, its “emptiness”, duration and actors (both individuals and communities). This paper deals with silences and silencing at the macrolevel (which includes their affective and social functions), as well as their effect at the microlevel of interpersonal interaction, everyday life and fieldwork encounters. The effects of the network of silences on the public presentation of the findings resulting from studying silence will also be discussed.
The Subversive Icon of Pregnancy in Opposition to the Culture of Fear
Authors: Marjanić Suzana
Published: June 2020

This paper problematizes the subversive icon of pregnancy and offers a linear overview of its various iterations in juxtaposition to the culture of fear, starting with Vlasta Delimar, whose installation Pregnancy (Trudnoća, 1987), inscribes her in the feminist and women’s art history of the Yugoslav/Croatian context as the first domestic artist who employed photo-documentation, or photo-performance, to document her own pregnancy. She performed her pregnancy in the manner of a goddess, sexualizing it by means of the Baubo pose. Next, the paper addresses the interpretations of the subversion achieved by the pregnant belly in Sanja Iveković’s work Lady Rosa of Luxembourg (2001). The sequence is further contextualized by the distressing confessional of Martina Križanić, a younger generation artist, who visualized the subversive representation of motherhood (Changing Booths, installation, 2017) from her own perspective and without fear, in the first local exhibition about pregnancy Woman – Pregnant Woman – Mother: Green Spheres and Necropolitics (Žena – trudnica – majka: zelene sfere i nekropolitike, Vladimir Bužančić Gallery, Zagreb 2017, curated by Anita Zlomislić).
Cohabitation et espace de rencontre comme moteurs de la nouvelle ruralité au Québec
Authors: Guimond Laurie , Simard Myriam , Gilbert Anne
Published: June 2020

Dans le contexte actuel des recompositions socioterritoriales que connaissent les campagnes québécoises, se façonnent de nouveaux processus d’habitabilité intimement liés à la cohabitation d’individus et de groupes qui n’habitent pas cet espace de la même manière. Cet article propose de dépasser la lecture binaire axée sur les antagonismes opposant les nouveaux ruraux et les ruraux de longue date. Il met de l’avant qu’il faut plutôt s’attacher à leur « espace de rencontre » pour conceptualiser la nouvelle ruralité qui marque ce début du XXIe siècle au Québec. L’espace de rencontre n’est pas sans créer des tensions puisqu’il est l’occasion de confronter rêves et ambitions, usages, visions et aspirations. Il représente une occasion de dialogue et de prise de décision démocratique à partir desquels se construit la nouvelle ruralité.
Le coworking en région au Québec : une innovation territoriale et entrepreneuriale contribuant au développement local?
Authors: Tremblay Diane-Gabrielle , Vaineau Erwan
Published: June 2020

Les espaces de coworking sont apparus d’abord dans les grandes métropoles du monde, mais se sont aussi multipliés en région. Ils visent l’échange de connaissances, la collaboration, le réseautage et l’innovation territoriale. Alors que ces espaces ont fait l’objet d’études dans les espaces métropolitains, ils ont été très peu étudiés en région. Nous avons donc mené une recherche dans des espaces de coworking en région au Québec. Nous avons pu constater que ces espaces visent souvent les mêmes objectifs de collaboration et de réseautage, mais qu’ils s’en distinguent aussi en région : les coworkers sont un peu plus âgés en moyenne et ont souvent une orientation plus entrepreneuriale, bien qu’ils soient aussi souvent travailleurs autonomes. Les espaces sont moins nombreux en région et moins axés sur les services d’animation ou la différenciation par la décoration ou l’ambiance. Les coworkers en région se préoccupent davantage de la dimension entrepreneuriale et gestionnaire, de services d’affaires et aussi de leur contribution au développement territorial local.
Revitalisation urbaine et gentrification positive : le cas du Cinéma Beaubien à Rosemont
Authors: Angulo Wilfredo , Klein Juan-Luis , Tremblay Diane-Gabrielle
Published: June 2020

Ce texte analyse le cas du Cinéma Beaubien à Rosemont, un projet culturel soutenu par une coalition d’organisations de la société civile. Grâce à l’élaboration de stratégies inclusives favorisant la cohésion sociale et la vitalité locale, ce projet a dynamisé une artère commerciale en friche et a été central dans la revitalisation récente du quartier. Ce cas nous permet de mieux saisir l’effet des projets culturels portés par des organismes communautaires, ancrés localement et encastrés dans un modèle économique où se conjuguent les échelles et les acteurs. L’ancrage local facilite l’émergence de nouvelles aspirations mobilisant les citoyens et développe le sentiment d’appartenance au territoire. Cette recherche ouvre la voie à de nouvelles interprétations postulant que, sous certaines conditions, les projets culturels peuvent éviter les effets négatifs associés à la gentrification, souvent concomitants à la revitalisation d’un milieu, lorsqu’ils sont amorcés par l’action collective et soutenus par du leadership partagé.
Service Provider Salience: When Guilt Undermines Consumer Willingness to Buy Time
Authors: Whillans Ashley V. , Lee-Yoon Alice J. , Dunn Elizabeth W.
Published: June 2020

Spending money on time-saving services can improve happiness and reduce stress. Yet many people do not spend money to save time even when they can afford to do so, potentially because they feel guilty about paying other people to complete disliked tasks on their behalf. Consistent with this proposition, we find evidence that individuals are most likely to experience guilt when outsourcing to a salient service provider. Across two large-scale surveys of working adults, including a nationally representative sample of employed Americans (Study 1a & 1b, N = 1,337), individuals reported greater guilt when they thought about outsourcing to a salient (vs. non-salient) service provider. Using a novel lab paradigm, participants felt greater guilt when the service provider was salient, which in turn undermined their willingness to buy time (Study 2, N = 350). In Study 3, these effects were mitigated by emphasizing the benefits of task completion for the service provider (N = 390). This research points to the potential of simple interventions to help organizations encourage individuals to make time-saving purchases.
It’s in Your Control: Free Will Beliefs and Attribution of Blame to Obese People and People with Mental Illness
Authors: Chandrashekar Subramanya Prasad
Published: June 2020

People’s belief in free will is shown to influence the perception of personal control in self and others. The current study tested the hypothesis that individuals who believe in free will attribute stronger personal blame to obese people and to people with mental illness (schizophrenia) for their adverse health outcomes. Results from a sample of 1110 participants showed that the belief in free will subscale is positively correlated with perceptions of the controllability of these adverse health conditions. The findings suggest that free will beliefs are correlated with attribution of blame to people with obesity and mental health issues. The study contributes to the understanding of the possible negative implications of people’s free will beliefs.
Kilogram i mol u novome ruhu – o korjenitim promjenama u Međunarodnom sustavu jedinica (SI)
Authors: Lopac Vjera
Published: June 2020

Od 20. svibnja 2019. jedinice Međunarodnog sustava SI definirane su s pomoću sedam prirodnih konstanti, νCs, c, h, e, kB, NA i Kcd. Promjene su prihvaćene na 26. sjednici Opće konferencije za utege i mjere (Conférence générale des poids et mesures, CGPM), održanoj u Versaillesu u Francuskoj 18. studenoga 2018. U članku su navedene stare i nove definicije osnovnih jedinica sustava SI, kao i matematički izrazi koji se dobiju rješavanjem algebarskih jednadžbi implicitno sadržanih u novim definicijama. Posebna je pozornost posvećena povijesti i novim definicijama jedinica kilogram i mol te metodičkim aspektima njihova tumačenja. Navedeni su i odabrani numerički primjeri, korisni za primjenu u srednjoškolskoj i sveučilišnoj nastavi kemije.
Relaciones de poder en cuatro obras de la literatura kurda contemporánea
Authors: García Perilla Juan Carlos , Velásquez Barón Fredy Alberto
Published: June 2020

El nacionalismo kurdo es un fenómeno de relevancia mundial que ha cobrado mayor notoriedad desde hace quince años, con la invasión de Irak por parte de Estados Unidos (2003) y el empoderamiento del Estado Islámico. En este contexto, los kurdos han ganado algunas reivindicaciones con la conformación de regiones autónomas en Irak y Siria. En este artículo se exploran y caracterizan desde la literatura las relaciones de poder tejidas entre los kurdos y los países que tienen soberanía sobre su territorio, mediante el análisis de las novelas El halcón (1997), de Yasar Kemal, novelista turco; Las plumas (1992), del poeta y novelista sirio Salim Barakat; Tierra de frontera (2001), de Sherko Fatah, escritor alemán de origen kurdo-iraquí; y el libro de cuentos El loco de la plaza Libertad (2016), de Hassan Blasim, cineasta y escritor iraquí. Para estudiar la relación de poder entre los kurdos y los Estados donde viven se formularon y desarrollaron tres categorías de análisis: cultura kurda, con base en el concepto de habitus de Pierre Bourdieu; relación entre los kurdos y los Estados que atraviesan Kurdistán, con sustento en la teoría del poder de Michel Foucault; y la subversión como intento independentista, según el concepto de línea de fuga de Gilles Deleuze y Félix Guattari.
Perfil de condición física de futbolistas universitarios que entrenan en altura moderada
Authors: Rivera Joven Angie Shirley , Roa Peralta Luigui Sebastián , Sánchez Rojas Isabel Adriana , Mendoza Dario
Published: June 2020

Objetivo: Determinar la condición física de futbolistas universitarios de Bogotá, Colombia, que entrenan en altura moderada. Método: Se realizó un estudio cuantitativo de tipo descriptivo y corte transversal con 191 futbolistas universitarios (84 volantes, 49 defensas, 38 delanteros y 20 porteros), con promedios de edad de 19,9 ±1,83; peso 66,4 ±8,88; talla 171 cm ±0,5 y un índice de masa corporal de 22,5 ±2,52 kg/m2. Se aplicaron pruebas de condición física como: salto horizontal (SH), sit and reach (SR), test de velocidad a 30 m desde salida estática (T30M) y shuttle run (SHR), pruebas de composición corporal y de resistencia cardiovascular donde se evaluaron: course navette (SRT-20m) y Cooper (CRT). Los datos son presentados como medias y desviaciones estándar; se compararon los resultados por posición de juego mediante análisis de varianzas de una vía (ANOVA) y se corrieron pruebas posthoc (Gabriel) para aquellas que resultaron significativas (p≤0,05). Resultados: El  análisis post hoc de Gabriel  mostró diferencias significativas entre el grupo de defensas y volantes (p=0,05). Todas las variables cumplieron el supuesto de homogeneidad de varianzas. La única variable que presentó una diferencia significativa fue el salto largo (F3-190 = 3,139; p = 0,027). Conclusiones: Se observaron diferencias significativas entre el grupo de defensas y volantes, las cuales pueden estar asociadas al patrón motriz, las variaciones en fuerza, velocidad, potencia muscular y cambios de ritmo que tiene cada posición dentro del juego.
Propuesta de modelo técnico de pateo en fútbol: Una revisión sistemática de variables cinemáticas y cinéticas
Authors: Aedo-Muñoz Esteban , Abarca-Reyes Victor , Torres-Moreno María-José , Bascuñan-Mosqueira Ricardo , Brito Ciro José , Miarka Bianca , Caro-San Juan José , Sánchez-Ramírez Celso , Poblete-Gálvez Carolina
Published: June 2020

Este artículo presenta una visión propositiva de la bibliografía actual en la técnica de pateo en fútbol. Los objetivos de la investigación son: (i) identificar las variables cinéticas y cinemáticas potenciales utilizadas en los análisis de la técnica y (ii) determinar los valores de variables cinéticas y cinemáticas en relación con la técnica de pateo en fútbol. Se revisaron las siguientes bases de datos; PubMed y Taylor and Francis online, para obtener artículos seleccionados desde 2000-2017. Se utilizó la metodología PRISMA®; se incluyeron artículos con participantes adultos o juveniles sobre la mecánica de pateo en fútbol a través de variables biomecánicas. Los artículos incluidos fueron 29, posteriormente se elaboró un modelo técnico compuesto por cuatro fases: preparación, balanceo, impacto y seguimiento. Una perspectiva biomecánica con base en la técnica podría ofrecer una estrategia prometedora para mejorar, a partir del entrenamiento y análisis de la técnica, el rendimiento en fútbol además de proveer antecedentes para la prevención de lesiones.
El discurso neoliberal en educación y sus otros lenguajes. El caso de la educación emocional en Argentina
Authors: Sorondo Juana
Published: June 2020

Este trabajo constituye un avance de la investigación en curso sobre la forma en que la educación emocional ingresa a las escuelas secundarias en Argentina, como un fenómeno representativo del alcance de la racionalidad neoliberal en el campo educativo y el proceso de endoprivatización. A partir del análisis cualitativo de entrevistas realizadas a personal docente que lleva adelante propuestas de educación emocional, se busca comprender qué sentidos sobre la escuela, la educación y los sujetos educativos se configuran en las prácticas discursivas de las personas entrevistadas. El trabajo apunta, en última instancia, a considerar los procesos de apropiación y resignificación de estos discursos, y detectar, así, los márgenes para la resistencia desde otras lógicas irreductibles al lenguaje único del neoliberalismo.
Emociones morales en educación: análisis del enfado en el contexto neoliberal
Authors: Mujica Johnson Felipe Nicolás
Published: June 2020

Desde la Antigua Grecia se ha generado un discurso que desprecia las emociones y las relega al ámbito personal. Pero, hace años, ese discurso se ha debilitado y el ámbito emocional está siendo reconocido como un aspecto relevante y, también, se ha posicionado en la vida pública. En este sentido, el presente ensayo analiza la emoción de enfado en el contexto neoliberal y algunas de sus implicancias en la educación. Para ello, se consideran diferentes aportes teóricos que exponen los beneficios culturales que suscita dicha emoción. Asimismo, se revisan algunas ideologías que favorecen la ignorancia o desvalorización del enfado en los procesos educativos. En suma, se concluye que una educación crítica debe clarificar el potencial del enfado para la transformación de la sociedad.
Obrigatoriedade e gratuidade da educação nos Estados Parte do Mercosul
Authors: Diniz Júnior Carlos Antônio
Published: June 2020

O objetivo deste artigo é analisar os ordenamentos normativos associados à obrigatoriedade e à gratuidade da educação nos Estados Parte do Mercosul. Alicerçado em referenciais teóricos que discutem a temática e tendo por base a análise documental, o artigo examina a constituição nacional, a lei geral da educação e demais ordenamentos que regulamentam a obrigatoriedade e a gratuidade. Entre seus resultados, revela que declarações e demais documentos editados por organismos internacionais contribuíram para tal normatização no âmbito de cada país. Demonstra ainda que, no caso do Mercosul, a educação é considerada elemento importante para o desenvolvimento e a integração da região. Entretanto, embora o trabalho identifique avanços no que diz respeito à regulamentação da ampliação da escolarização, tais documentos não foram suficientes para garantir a efetividade do acesso dos sujeitos em idade escolar.
O entendimento do conceito de gestão democrática na escola pública: caso específico do Estado da Bahia (Brasil)
Authors: Fonseca Sônia , Monarca Héctor , Nunes Cristiane
Published: June 2020

Este artigo objetiva refletir sobre o Art. 206 da Constituição Brasileira de 1988 e seu entendimento pelo(a)s diretores(as) das escolas públicas do Ensino Médio, no Estado da Bahia. Trata-se de um recorte preliminar da pesquisa, Gestão da Escola e os Resultados do IDEB: qual a relação? A abordagem teórica baseou-se nos estudos de Luck (1996), Paro (2000), Ravitch (2011) e Monarca (2018a). Metodologicamente o estudo é exploratório descritivo, incidindo nos resultados obtidos com uma amostra de 126 sujeitos, diretores de escolas, respondentes ao questionário. O resultado principal identifica que há um entendimento polissêmico, pelo(a)s diretores(as), sobre o conceito de “gestão democrática” e padrão de qualidade, diferindo do que preceitua os incisos analisados.
Aplicativo para estimativas de leituras de detectores segundo um método numérico analítico para problemas adjuntos de difusão multigrupos de energia
Authors: Enomoto Lisa Susana , Curbelo Jesús Pérez , Barros Ricardo Carvalho de , Alves Filho Hermes
Published: June 2020

É descrito nesse trabalho uma metodologia computacional para obtenção de solução analítica das equações estacionárias da difusão de partículas neutras, e.g., nêutrons e fótons, nas formulações física e adjunta em problemas unidimensionais, considerando o modelo multigrupo de energia e em meios não multiplicativos. Foram adotadas condições de contorno especiais para cálculos de problemas tipo fonte-detector; i.e., estimativas de leituras de detectores de partículas neutras devido a uma conhecida distribuição de fontes interiores e/ou incidências pelo contorno. Neste contexto, é apresentado um método nodal analítico para problemas adjuntos de difusão de partículas neutras. Este método numérico analítico gera soluções que são completamente livres de erros de truncamento espacial, afora os erros de arredondamento da aritmética finita computacional. A técnica do problema adjunto é bastante eficiente em problemas tipo fonte-detector, considerando que é possível usar a mesma solução adjunta para qualquer distribuição e/ou intensidades de fontes interiores, desde que não se altere a localização do detector.  Para implementação desta metodologia foi desenvolvido um aplicativo computacional na plataforma MATLAB® para Windows, que faz a simulação desses problemas tipo fonte-detector. O aplicativo nos fornece a estimativa de leituras de detectores de partículas neutras segundo a teoria da difusão multigrupo de energia. É considerado um problema-modelo para ilustrar a precisão e eficiência dos resultados numéricos gerados pelo aplicativo.
Quality control of small animal PET scanner: The Brazilian Scenario
Authors: Gadelha Gontijo Rodrigo Modesto , Ferreira Andréa Vidal , Silva Juliana Batista , Mamede Marcelo
Published: June 2020

This work aims to evaluate the quality control program for small animal PET (positron emission tomography) scanners in Brazil. A questionnaire focused on type of small animal PET scanner and quality assurance program was prepared and sent to all Brazilian preclinical molecular imaging services that participated in the first Brazilian microPET/SPECT/CT users meeting held at the Federal University of Rio de Janeiro. The answers were compiled and descriptive statistic was applied. There are six preclinical molecular imaging services using PET scanner in Brazil. Five are in the southeastern region and one in the southern region. All services have a single PET device, but most of them have hybrids modalities with CT (computed tomography) and/or SPECT (single photon emission computed tomography). All services have knowledge of the NEMA NU 4-2008 publication specific to small animal PET equipments. However, most of them do not have a quality assurance program in place for their imaging systems. There are few preclinical PET devices installed in Brazil and most of them are located at southeastern region. Regardless the absence of quality assurance program in many of the services, there is a consensus on the importance of quality control program implementation.
Gastroprotective Effect of Symplocos Racemosa Whole Plant Methanolic Extract Against Experimentally Induced Gastric Ulcer in Rat
Authors: R. K. Gupta  , Ravi Vishwakarma  , Yashwant Giri  , Varinder Singh
Published: June 2020

Peptic ulcer is a condition which results from an imbalance between offensive and defensive factors of gastrointestinal system. The investigation was designed to evaluate the antiulcer activity of Symplocos racemosa whole plant methanol extract (MESR) in rat model of indomethacininduced gastric ulceration. The total acidity, gastric volume, pH and free acidity were measured to determine the anti-ulcer activity of MESR. Pretreatment with MESR (125-500 mg/kg) markedly reduced the indomethacin-induced increase in gastric ulcer index and score. These results revealed that antisecretory effects MESR were responsible for antiulcer activity of MESR.
Inhibition of Formalin Induced Paw Edema in Rats by Various Fractions/Extracts of Bryophyllum Pinnatum
Authors:   Babu Banarsi Das National Institute of Technology and Management, Lucknow, Uttar Pradesh-227108, India, Gupta RK , Lohani M ,   Department of Biotechnology, Integral University, Kursi Road, Lucknow, Uttar Pradesh-226021, India, Vishwakarma R ,   Arya Collage of Pharmacy, RIICO Industrial Area, Kukas, Jaipur, Rajasthan-302028, India
Published: June 2020

Traditionally, Bryophyllum pinnatum is used in the management of arthritis and inflammatory diseases. However, B. pinnatum has not been analysed previously for anti-inflammatory activity. Hence, this study is designed to determine the anti-inflammatory effects of various fractions of B. pinnatum leaf extract using rat model of formalin-induced paw edema. Treatment with various fractions showed marked decrease in formalin-induced paw volume and edema in rats. The results of BPAAF treatment were comparable to standard drug, diclofenac. These results indicate that B. pinnatum could be developed as ant-inflammatory drug after further studies
Evaluation of Antimitotic Activity of Momordica Dioica Fruits on Allium Cepa Root Meristamatic Cells
Authors:   Prof. Ravindra Nikam College of Pharmacy, Gondur, Dhule-424002, Maharashtra, India, Ahirrao RA , Patange BS ,   College of Pharmacy, Lonkheda, Shahada-425409, Maharashtra, India, More SV ,   College of Pharmacy, Lonkheda, Shahada-425409, Maharashtra, India
Published: June 2020

Natural occurring phenolic compounds play an important role in cancer prevention and shows antimitotic activity. Number of active constituents like phenolic acid, curcuminoids, coumarine, ligans, quinones, etc. is showing antimitotic activity of Momordica dioica. The present work is on phytochemical investigation and examines antimitotic activity of aqueous extract of fruits Momordica dioica at concentration of 15 mg/ml on Allium cepa root meristamatic cells. The fruits are air dried and extracted with solvents like water by maceration method. The evaluation of antimitotic activity is done by using Allium cepa root meristamatic cells parameters where and methotrexate was used as a standard drugs. In Allium assay, aqueous extract of fruits of Momordica diocia(15 mg/ml) and methotrexate act against cells of allium roots and lesser the growth of root and mitotic index when compared with distilled water as control group. The result indicated that cytotoxic property is due to presence of phenolic, alkaloids and flavonoids compounds in 15 mg/ml concentration of aqueous extract of Momordica diocia fruits extract. On the basis of result, we concluded that, 15 mg/ml concentration of Momordica dioica fruits shows good antimitotic activity on the Allium cepa root tip assay.
O Ensino de Física na Educação de Jovens e Adultos: o que pensam docentes e discentes
Authors: Krummenauer Wilson Leandro , Darroz Luiz Marcelo
Published: June 2020

No presente artigo relatamos os resultados de uma pesquisa qualitativa fenomenológica realizada com alunos e professores da Educação de Jovens e Adultos (EJA) em diferentes escolas da região do Vale do Rio dos Sinos, RS. Para coleta de dados utilizamos um questionário aplicado a docentes e outro a discentes, objetivando verificar as concepções pedagógicas que norteiam a prática docente e o que pensam os discentes sobre as aulas de Física. Para análise de dados utilizamos a Análise Textual Discursiva, da qual emergiram diferentes categorias e subcategorias de análise. Os resultados indicam que a maioria dos professores afirmam que utilizam algum referencial teórico na preparação de suas aulas, a maioria refere-se ao construtivismo. Já os alunos, relatam que não conseguem estabelecer a relação com o que é ensinado na escola com seu cotidiano.
A multiplicação nos anos iniciais do Ensino Fundamental: da teoria para a prática
Authors: Kuhn Malcus Cassiano , Pereira Jesiane de Freitas
Published: June 2020

O artigo contempla o ensino da multiplicação nos anos iniciais do Ensino Fundamental, com uma abordagem qualitativa, através de um estudo bibliográfico, embasado na Teoria de Aprendizagem Significativa, no Campo Conceitual Multiplicativo de Vergnaud e na BNCC. Traz reflexões sobre o contexto da Matemática que explora o princípio multiplicativo nos anos iniciais e sugere práticas pedagógicas para qualificar o trabalho em sala de aula. A área de Matemática na BNCC apresenta a multiplicação na unidade temática números, a partir do 2º ano, e é desenvolvida de forma gradativa, explorando-se as ideias de adição de parcelas iguais, proporcionalidade, disposição retangular e combinação. Acredita-se que a resolução e elaboração de problemas, atividades investigativas, o uso de materiais concretos, jogos e recursos tecnológicos, sejam fundamentais no processo de ensino da multiplicação, para promoção de uma aprendizagem significativa. O professor  deve planejar situações de aprendizagem que envolvam os estudantes de forma ativa na construção dos conceitos de multiplicação, considerando as orientações da BNCC e a realidade escolar.
New records and confirmation of the presence of three species of primates (Mammalia, Primates) in southwestern Colombia
Authors: Ramírez-Chaves Héctor E. , Carvajal-Agudelo Juan D. , Hoyos R Manuel , Bustamante-Manrique Sebastián , Castaño-Rivera Alejandra , Rivillas-Carmona Maria Alejandra , Ossa-López Paula A. , Rivera-Páez Fredy A.
Published: June 2020

Cebus albifrons (Humboldt, 1812); Sapajus apella (Linnaeus, 1758) and Aotus lemurinus I. Geoffroy, 1843 are widely distributed primates in Colombia. Despite this, there are gaps in the occurrence of these species in the southwestern part of the country. Through the collection of specimen remains, molecular analyses and review of museum specimens, we reported new records for these species in the Department of Nariño, expanding their distribution range. Finally, we highlight some important notes for the conservation of these species.