bluuebunny/crossref_metadata_2025 huggingface dataset:
The crystal structure of (E)-2-(5-bromo-2-hydroxybenzylidene)-N-phenylhydrazine-1- carboxamide monohydrate, C14H14BrN3O3
Authors: Li-Hua Wang , Xiao-Jing Zhou , Li-Li Liu , Ai-Ling Zhang , Xi-Shi Tai
Published: November 2020

C14H14BrN3O3, orthorhombic, Pca21 (no. 29), a = 32.932(3) Å, b = 5.8490(7) Å, c = 7.3606(8) Å, V = 1417.8(3) Å3, Z = 4, R

gt
(F) = 0.0260, wR

ref
(F
2) = 0.0553, T = 150 K.
The crystal structure of 4-amino-N′-(4-aminobenzoyl)benzohydrazide monohydrate, C14H16N4O3
Authors: Xi-Shi Tai , Xiao-Jing Zhou , Li-Li Liu , Ai-Ling Zhang , Li-Hua Wang
Published: November 2020

C14H16N4O3, orthorhombic, P21212 (no. 18), a = 8.0968(7) Å, b = 16.6829(17) Å, c = 5.3097(5) Å, V = 717.22(12) Å3, Z = 2, R

gt
(F) = 0.0420, wRref
(F
2) = 0.0816, T = 293(2) K.
The crystal structure of butyrylferrocene, C14H16FeO
Authors: Hosten Eric C. , Betz Richard
Published: November 2020

C14H16FeO, orthorhombic, P212121 (no. 19), a = 5.6954(3) Å, b = 10.0307(6) Å, c = 20.4422(14) Å, V = 1167.84(12) Å3, Z = 4, R

gt
(F) = 0.0267, wR

ref
(F
2) = 0.0559, T = 200 K.
The crystal structure of 1-bromo-4-iodo-benzene, C6H4BrI
Authors: Hosten Eric C. , Betz Richard
Published: November 2020

C6H4BrI, monoclinic, P21/c (no. 14), a = 4.1704(6) Å, b = 5.8242(8) Å, c = 14.929(2) Å, β = 97.315(5)°, V = 359.67(9) Å3, Z = 2, R

gt
(F) = 0.0303, wR

ref
(F
2) = 0.0982, T = 200 K.
The crystal structure of 4-chloro-1-methylpiperidin-1-ium chloride, C6H13Cl2N
Authors: Muller Kina , Hosten Eric C. , Betz Richard
Published: November 2020

C6H13Cl2N, orthorhombic, P212121 (no. 19), a = 6.0087(3) Å, b = 10.1176(6) Å, c = 14.3532(7) Å, V = 872.58(8) Å3, Z = 4, R

gt
(F) = 0.0304, wR

ref
(F
2) = 0.0632, T = 200 K.
Study of the drying kinetics and calculation of mass transfer properties in hot air drying ofCynara cardunculus
Authors: Guiné Raquel P. F. , Lima Maria João
Published: November 2020

In the present work, mass transfer properties of thistle flower (Cynara cardunculusL.) were evaluated for the convective drying carried out at temperatures between 35 and 65°C, with an air flow of 0.5 m/s. The calculations followed two different algorithms, based on mathematical models derived from the thin layer drying equation and Fick’s second law of diffusion. The results obtained indicated that different methodologies resulted in different values of mass transfer properties, which is an alert that care must be taken when choosing which calculation method might be more appropriate in a specific practical application. In all cases, the values of moisture diffusion and mass transfer coefficient were found to increase with increasing operating temperature. The values of diffusivity increased from 2.7866 × 10−9to 1.4027 × 10−8 m2/s for the thin layer model-based algorithm and from 1.9256 × 10−10to 1.2033 × 10−9 m2/s for Fick’s equation model. The values of the mass transfer coefficient increased from 8.4335 × 10−8to 8.4400 × 10−7 m/s and from 5.8277 × 10−9to 7.2398 × 10−8 m/s, respectively, for the thin layer and Fick’s law-based models.
Genizah Ms. 17: an Extract from an Early Version of the Passio of St Plato of Ancyra, Part 1
Authors: Trachsel Alexandra
Published: November 2020

The study pursues two aims. The first part is dedicated to the deciphering and editing of a new text preserved as palimpsest on a parchment bifolio. It belongs to a small collection of documents from the Cairo Genizah owned by the University of Geneva. The fragment reveals an extract from an early version of a Passion of St Plato of Ancyra, a saint who is best known through Byzantine menologia. His Passion was also reworked by Symeon Metaphrastes in the 10th century. However, the new text is closest to an anonymous pre-metaphrastic version available in Migne’s Patrologia Graeca. The second aim of the paper (developed in Part 2) is, therefore, to establish the relation between different versions of the Passion and locate the new witness from the Cairo Genizah in the history of the transmission of this text.
Metal-insert technique for polypropylene composite bipolar plate manufacturing
Authors: Yeetsorn Rungsima , Maiket Yaowaret
Published: November 2020

A single cell of direct methanol fuel cell (DMFC) typically delivers an electrical potential between 0.5 and 1 V; thus DMFCs are assembled in parallel to meet power demands (1–5 kW). Bipolar plates (BPs) are the primary components connecting a single cell to the adjacent cells so that they provide optimum electrical conductivity. The objective of this research is to reduce the volume resistance of BPs made from a polypropylene/carbon composite by utilizing a metal insert technique. A major obstacle when it comes to molding composite plates inserted by a thin metal sheet is the delamination of material layers after the cooling process. The delamination issue is due to different surface polarities between metal and polypropylene-composite surfaces. One of the strategies to solve this issue is to modify the surface of one layer for creating similarity of the surface polarity. A metal sheet surface was coated with graphene using a cold spraying technique to enhance adhesion ability. The suitable spraying conditions were determined by experimenting with varying temperature, pressure, graphene quantity and graphene types. The effectiveness of surface modification by the graphene spraying technique was assessed by a surface morphology observation, an electrical conductivity measurement and DMFC performance tests. Results were interesting, they indicated that when DMFC was assembled with silver sheet, inserted BPs provided 25.13 mW/cm2 of power density, 3,350.7 mWh of generated energy and 67% of efficiency. This highlights that the performance of a BP prototype is superior to the performance of a commercial composite bipolar plate.
PNIPAAM/SA pH-responsive microcapsules based on chemical and non-covalent crosslinking
Authors: Fei Zhengdong , Zheng Dong , Fan Ping , Chen Feng , Zhong Mingqiang
Published: November 2020

A triple interpenetrating polymer network (IPN) with dual responses to temperature and pH was constructed based on chemical crosslinking and electrostatic interaction. In this IPN, CaCO3 microspheres were used as the kernel and PNIPAAM/sodium alginate microcapsules were prepared by the inverse emulsion polymerization method. Research results demonstrated that CaCO3 kernels were decomposed into Ca2+ and CO2 at pH 1.2. Such decomposition facilitated the formation of triple IPN of Ca2+ crosslinking. Moreover, microcapsules were expanded by tension of CO2 and the volume increased to 3.55 × 105 times that of the original microcapsules, with capsules remaining an intact morphology. These microcapsules loading doxorubicin hydrochloride (DOX) stability and responses to environment were investigated. No drug overflow was observed at pH 7.4, indicating the high stability of microcapsules. However, DOX was released gradually in the simulated human stomach acid with a weak solution of hydrochloric acid (pH 1.2, 37 °C). This showed that the prepared microcapsules were feasible for drug-loaded capsules and the controlled drug release behavior could relieve side effects of drugs to human body. Moreover, it will help to increase the drug utilization and realize accurate treatment.
Comparative studies of excited state intramolecular proton transfer (ESIPT) and azo-hydrazone tautomerism in naphthalene-based fluorescent acid azo dyes by computational study
Authors: Shinde Suvidha , Sekar Nagaiyan
Published: November 2020

We found that benzothiazole is responsible for enhancing fastness properties of dyes. On comparing the total electronic energies of naphthol tautomers (−1425.16 eV) and its analogs (−2146.59 eV), we found that benzothiazolyl series is more stable than the naphthol series. Frontier Molecular Orbitals (FMOs) also show flow of charge transfer from the donor to the acceptor in benzothiazole-containing compounds, whereas it is absent in plane naphthol series. Among the benzothiazolyl isomers, the hydrazone form is found to be more stable and responsible for fluorescence possession. Highest Occupied Molecular Orbital (HOMO)–Lowest Occupied Molecular Orbital (LUMO) energy band gap also indicates the same. Electrophilicity index and hyper-hardness values of both the series were found to be positive which directly ratifies photostability and reactivity. Benzothiazolyl series was found to be more stable, hence light fastness, enhanced.
Art as a Symbol of Social Change: Material Expression of Forming Identity in the Early Medieval Trade Towns around South and Eastern Baltic. Wolin and Novgorod Case Study
Authors: Filipowiak Wojciech , Tochilova Nadezhda
Published: November 2020

In the early medieval urban centers on the south and east coast of the Baltic, objects decorated in Scandinavian style were used, however with the local character of ornamentation. The authors analyze large collections of this type of artifacts from Wolin and Novgorod against the wide North European background. They indicate the spread of this phenomenon in the Baltic area, naming it Viking Periphery Art and offer an explanation of its origin instead of previous attempts of defining this phenomenon as a Pomeranian School of Scandinavian-Insular Art. They argue that the local art is a testimony to social changes: the fusion of different cultural elements could be proof of the development of the new identity of town elites taking part in long-distance trade in the 10th century.
Effect of Cd and SPD on structure, physical, mechanical, and operational properties of alloy of Cu-Cr-Zr
Authors: Aksenov Denis A. , Raab Georgiy I. , Asfandiyarov Rashid N. , Semenov Vladimir I. , Shuster Lev Sh.
Published: November 2020

An increase in the service life of electrical products from copper and its alloys is directly related to an increase in the wear resistance of materials. Structural refinement and alloying with cadmium are known to have a positive effect on the strength characteristics and wear resistance of copper, which makes it possible, with a Cd content of 1% by weight, to increase the wear resistance of copper several times, but cadmium is considered an environmentally unsafe element. In this regard, the paper presents the results of studies of a widely used Cu-Cr-Zr alloy system in the ultrafine-grained (UFG) state, micro-alloyed with cadmium (0.2%, weight), in order to improve physical, mechanical, and operational properties, as well as environmental safety. Severe plastic deformation, providing structure refinement to ~150 nm, and microalloying with cadmium of a Cu-Cr-Zr system alloy, after a complete processing cycle, provides a tensile strength of 570±10 MPa and 67% electrical conductivity. At the same time, the abrasion resistance increases by 12 and 35% relative to the industrial systems Cu-Cd and Cu-Cr-Zr, respectively. The obtained characteristics are very promising for improving the operational properties of continuous welding tips, collector plates, and contact wires operating under conditions of intense wear.
To Settle or to Fight to the End? Case-level Determinants of Early Settlement of Investor-State Disputes
Authors: Vu Duy
Published: November 2020

International investment arbitration is a third-party dispute resolution mechanism aimed mainly at depoliticizing investment disputes and maintaining efficient investment flows among countries. Almost one-third of treaty-based investor-state disputes brought before this system are settled before the tribunal’s final ruling. Given the classical “Against Settlement” debate in the legal literature, we build an original database of treaty-based arbitrations from 1996 to 2016 to empirically test the determinants of early settlement. We find that the probability of settlement increases if the host state has no experience of resolving those kinds of disputes but decrease if it anticipates a favorable outcome. The nature of the regulatory measures applied by the host state and the identity of foreign investors are additional important determinants of settlement. Interestingly, we find strong evidence of a Dutch effect in dispute resolution.
A semiparametric method for the analysis of outcomes during a gap in HIV care under incomplete outcome ascertainment
Authors: Bakoyannis Giorgos , Diero Lameck , Mwangi Ann , Wools-Kaloustian Kara K. , Yiannoutsos Constantin T.
Published: November 2020

Objectives

Estimation of the cascade of HIV care is essential for evaluating care and treatment programs, informing policy makers and assessing targets such as 90-90-90. A challenge to estimating the cascade based on electronic health record concerns patients “churning” in and out of care. Correctly estimating this dynamic phenomenon in resource-limited settings, such as those found in sub-Saharan Africa, is challenging because of the significant death under-reporting. An approach to partially recover information on the unobserved deaths is a double-sampling design, where a small subset of individuals with a missed clinic visit is intensively outreached in the community to actively ascertain their vital status. This approach has been adopted in several programs within the East Africa regional IeDEA consortium, the context of our motivating study. The objective of this paper is to propose a semiparametric method for the analysis of competing risks data with incomplete outcome ascertainment.

Methods

Based on data from double-sampling designs, we propose a semiparametric inverse probability weighted estimator of key outcomes during a gap in care, which are crucial pieces of the care cascade puzzle.

Results

Simulation studies suggest that the proposed estimators provide valid estimates in settings with incomplete outcome ascertainment under a set of realistic assumptions. These studies also illustrate that a naïve complete-case analysis can provide seriously biased estimates. The methodology is applied to electronic health record data from the East Africa IeDEA Consortium to estimate death and return to care during a gap in care.

Conclusions

The proposed methodology provides a robust approach for valid inferences about return to care and death during a gap in care, in settings with death under-reporting. Ultimately, the resulting estimates will have significant consequences on program construction, resource allocation, policy and decision making at the highest levels.
Schelling über Dantes Commedia und Goethes Faust als Neue Mythologien
Authors: Auer Flavio
Published: November 2020

The concept of a New Mythology is a central topic of Early Romantic philosophy. Whereas its most influential delineations in the Älteste Systemprogramm and by Friedrich Schlegel believe a New Mythology to be impossible, Schelling takes a more optimistic view. In his Philosophie der Kunst Schelling formulates a theory of mythology which also accomodates a modern mythology. His most important examples of such a New Mythology are Dante’s Commedia and Goethe’s Faust.
Graffito of the Scribes of the Royal Necropolis of the 21st Dynasty from the Hatshepsut Temple at Deir el-Bahari
Authors: Barwik Mirosław
Published: November 2020

A hieratic graffito from the temple of Queen Hatshepsut refers to the names of the members of the well-known family of the scribes of the royal necropolis, descendants of the scribe Tuthmosis and his son Butehamun. This graffito can be dated to the period of the early 21st Dynasty, as at least three of the sons of Butehamun are mentioned here, alongside one of his grandsons by the name Meniunefer (III).
‘To All the Gods of Neferusy’
Authors: Ferreres Romain
Published: November 2020

The unpublished stele of Djehutymes son of Nehemaway presented here is a small monument coming from a region poor in archaeological remains and showing the piety of a man towards the gods of his hometown. The stele’s main interests lie in the unusual depiction of the frog goddess Heqet as well as in the reference to the two cities of Her-wer and Neferusy, thus adding another stone to the building of their relationship as well as their nature.
Ultra-high-performance liquid chromatography – high-resolution mass spectrometry profiling and hepatoprotective activity of purified saponin and flavonoid fractions from the aerial parts of wild spinach (Chenopodium bonus-henricusL.)
Authors: Kokanova-Nedialkova Zlatina , Nedialkov Paraskev , Kondeva-Burdina Magdalena
Published: November 2020

An ultra-high-performance liquid chromatography – high-resolution mass spectrometry profiling method was used for a comprehensive study of flavonoid and saponin-rich fractions from the aerial parts of wild spinach (Chenopodium bonus-henricusL.). Thirty-six compounds, respectively,22saponins of eight sapogenins (phytolaccagenin, bayogenin, medicagenic acid, 2β-hydroxygypsogenin, 2β-hydroxyoleanoic acid, 2-hydroxy-30-nor-gypsogenin, 2-hydroxyakebonic acid, and akebonic acid) together with12 flavonoid glycosides of 6-methoxykaempferol, isorhamnetin, patuletin, spinacetin as well as two ecdysteroids (20-hydroxyecdysone and polypodine B) were detected. The occurrence of sapogenins 2-hydroxy-30-nor-gypsogenin, 2-hydroxyakebonic acid, and akebonic acid in theChenopodiumgenus is reported here for the first time. The flavonoid and saponin-rich fractions showedin vitrohepatoprotective and antioxidant activity comparable to those of flavonoid complex silymarin (60 μg/mL) in a model of metabolic bioactivation, induced by CCl4. All tested fractions, compared to silymarin, significantly reduced the cellular damage caused by CCl4in rat hepatocytes, preserved cell viability and GSH level, decreased LDH leakage, and reduced lipid damage. The results showed that saponin-rich fractions F3A and F3B possessed better hepatoprotective activity than flavonoid-rich fractions (F2A and F2B). The most active was fraction F3B and this is probably due to the synergism between the saponins and some acylated flavonol glycosides found there.
Diazo-pyrazole analogues as photosensitizers in dye sensitised solar cells: tuning for a better photovoltaic efficiency using a new modelling strategy using experimental and computational data
Authors: John Athira M. , Thomas Renjith , Balakrishnan Sreeja P. , Al-Zaqri Nabil , Alsalme Ali , Warad Ismail
Published: November 2020

The designing of a dye sensitised solar cell (DSSC) is one of the frontiers in harvesting solar energy as it provides an alternative to economic photovoltaic devices with increased efficiency. In this manuscript, we report a new methodology using experimental and theoretical data for the evaluation of the photosensitiser activity of organic dyes using theoretical simulations and experimental cell efficiency data. As a representative example, we designed a series of 54 novel pyrazole derivatives which are subjected to TD-DFT simulations (CAM-B3LYP/6-311G++ (2d, p)) and photovoltaic modelling. Data from computational simulations, as well as known experimental cells, are used for the calculation of photovoltaic efficiency. We selected pyrazole derivatives because of its proven use in DSSC as an effective dopant in a blended polymer electrolyte in nanocrystalline DSSC. Fine-tuning with the effect of substitution and with the π spacers at the ortho, meta and para positions for −OCH3, −OH, −CHO, −NO2 respectively were done. Enhanced efficiency of 7.439% was observed as compared to the standard cell of efficiency of 5.530%. An increase in efficiency was not observed with the effect of π spacers. The newly designed dyes demonstrate desirable energetic and spectroscopic parameter that can lead to efficient metal-free organic dye sensitiser for DSSC’s. The main advantage of this strategy is the incorporation of both simulated and experimental data. It will reduce the possible errors from the simulations and also, helps in performing time-consuming experimental studies.
Exilio, insilio, cárcel y violencia: 1948-1952
Authors: Chacón-Araya German , Oliva-Medina Mario
Published: November 2020

En este ensayo buscamos acercarnos a la suerte que corrieron miles de costarricenses durante el inicio del año 1948 hasta 1952. Dicho periodo está marcado por el comienzo de la represión abierta de carácter político contra los adversarios del autodenominado Ejército de Liberación Nacional, que ingresó a la capital a fines de abril de 1948, y hasta el al año de 1952, fecha límite cuando la mayor parte de los exiliados políticos regresaron al país producto de nuevas condiciones democráticas que se estaban gestando.
Un cercano amigo de Francisco I. Madero
Authors: Gutiérrez-Mueller Beatriz
Published: November 2020

Este ensayo analiza la estadía de Rogelio Fernández Güell en México y las razones que lo llevaron al exilio en este país, donde entabla amistad personal con Francisco I. Madero.
Hacia una taxonomía de las prácticas extensionistas en perspectiva histórica
Authors: Zavaro Pérez Carlos A.
Published: November 2020

This paper analyzes some modalities of the extensionist practice, emphasizing the particularities and the relevance of the economic and socio-political context in which this practice occurs. Categories, such as paradigm, format, device, and tool, are used and discussed in this hierarchical taxonomic system that is defined by two paradigms (transferencism paradigm and problematization paradigm), under which the different recognized formats can be grouped: informative format, awareness-raising format, professionalizing format, classroom intervention format, community intervention format (technocratic-solidarity or critical modalities), and a format that integrates the academic practices, finding in some of them the possibility of belonging to both paradigms and the ductility of some tools recognized as mediation of the practice.
MUHAMET-GERAI'S HAMAM: THE DISAPPEARED PART OF THE BAKHCHYSARAI PALACE
Authors: Moicєєв Дмитро
Published: November 2020

This article is about the problem of the historical topography of the downtown of Bakhchisarai -Hansaray. It was the centre of formation of the medieval city and the capital of the Crimean Khanate. A popular belief is that Hansaray is, in one sense, a copy and development of the idea of a medieval Eastern Palace (videlicet, the Top Cap in Istanbul) and dominates in historiography.

The study of kırımlı cultural and historical heritage remains at a very low level as a result of permanent genocide by Russia empire in the XIX-XX centuries. This led to the development of a distorted picture of the historical and scientific understanding of cultural heritage. Great and significant monuments, even scientific memory about them, have disappeared from the cultural and historical landscape. Mehmed IV Geray baths is an example of this. The actual location of the monument with the help of archaeological geolocation method has been determined in this article. This discovery and interpretation, as an important part of the palatial part of the city development, gives a different look at the whole complex of Hansaray. The Khan's Palace is the centre of the city in contradistinction from the Oriental palaces. Quarters of socially important structures formed around it (one of them was Mohammed IV Giray's baths). After that city development transforms into civic blocks with town mansions, mosques and other public buildings.
DINAMIKA HISTORIS BARAT-ISLAM: MISPERSEPSI, PRASANGKA, DAN KONFLIK
Authors: Alim Syahirul
Published: November 2020

Absract. The historical dynamics of the West-Islam always depicted as a phenomenon of misperception, antipathy, and conflicts that have been going on since the 12th century. The events of the Crusades and the spirit of reconquest of areas once occupied by Islam, leaving a bad-trail imprint in almost all perspectives of Western society towards Islam. Western antipathy was shown through negative sentiments, such as the term "saracen" to Muslim troops and the title of "Moor" which is still used by Western elites when they invaded and control various Muslim-majority areas. The heritage of Islamic civilization for the progress of the Western World is only valued to the extent of the "threat" about the revival of the glory of Islamic civilization that had ruled the world for about 7 centuries. The efforts of some Western scholars who are more objective perceived in understanding Islam, apparently are not so influential and Islam was still misunderstood by the West, even Islamophobia was becoming a phenomenon that strengthens as a form of Western fear of Islam. This paper seeks to portray the historical dynamics of West-Islam from various perspectives descriptively-analysis through a historical approach. Historical awareness is needed, so that too excessive and baseless assessments of anything should be avoided, because history was a series of past events that can provide information in the present, functioning as a frame of knowledge in placing a reality in a fitting and objective manner. Abstrak. Dinamika historis Barat-Islam selalu menggambarkan fenomena mispersepsi, antipati, bahkan konflik yang telah berjalan sejak abad ke-12. Peristiwa Perang Salib dan semangat penaklukan kembali wilayah-wilayah yang pernah dikuasai Islam oleh pasukan Salib, meninggalkan jejak buruk dalam hampir seluruh perspektif masyarakat Barat terhadap Islam. Antipati Barat ditunjukkan melalui sentimen negatif, seperti sebutan “saracen” kepada pasukan Muslim dan gelar orang “Moor” yang tetap dipakai kalangan elit Barat ketika mereka melakukan invasi dan penguasaan atas berbagai wilayah berpenduduk mayoritas Muslim. Warisan peradaban Islam bagi kemajuan Dunia Barat hanya dihargai sebatas “ancaman” tentang kebangkitan kembali kejayaan peradaban Islam yang pernah menguasai dunia selama kurang lebih 7 abad. Upaya beberapa sarjana Barat yang lebih objektif dalam memahami Islam, ternyata tidak begitu berpengaruh dan Islam tetap disalahpahami oleh Barat, bahkan Islamofobia menjadi fenomena yang menguat sebagai bentuk ketakutan Barat terhadap Islam. Tulisan ini berupaya memotret dinamika historis Barat-Islam dari berbagai perspektif secara deskriptif-analisis melalui pendekatan historis. Kesadaran historis diperlukan, sehingga penilaian yang terlampau berlebihan dan tanpa dasar terhadap hal apapun seharusnya dapat dihindari, sebab sejarah merupakan rangkaian peristiwa masa lalu yang dapat memberikan informasi pada masa kini, berfungs sebagai bingkai pengetahuan dalam menempatkan sebuah realitas secara pas dan objektif.
ANALYSIS OF THE REPORTING FRAMING OF MILLENNIAL GENERATION AND THE GOVERNMENT REGARDING COVID-19 IN ONLINE MEDIA
Authors: Putrapratama Ammar , Khairani Dewi
Published: November 2020

Abstrak. This study aims to identify the news about the Covid-19 Task Force in the three online media editions of 20-23 March 2020. The four stages of Framing Entmant include: Define Problem, Diagnose Cause, Make moral judgment and Treatment recommendation. This study uses theanalysis method framing Robert N. Entmanwith a qualitative approach. The results show that the Define Problem in reporting related to government policy in cooperating with influencers is not considered the right choice, Diagnose cause is shown in the indifference of the millennial generation in responding to the Covid-19 pandemic, Make moral judgment in the form of affirming that influencers are not paid in this program as a form of their contribution to the country, and the treatment recommendation offered is for the government to provide influencers with a strong understanding of covid-19 before becoming a mediator to deliver messages for millennials. Online media is a public space that is considered important as a reference in increasing public information literacy, so that the news is expected to be more objective and educational. Abstrak. Kajian ini bertujuan untuk mengidentikasi pemberitaan terkait kinerja Bandan Penanggunalangan Covid-19 dalam tiga media online edisi 20-23 Maret 2020. Pembingkaian pemberitaan melalui empat tahap yaitu, definisi problem, diagnosis penyebab, penyusunan keputusan moral/etika dan rekomendasi.  Kajian ini menggunakan metode analisis pembingkaian dari Robert N. Entwan dengan pendekatan kualitatif. Hasil penelitian menunjukkan bahwa dalam tahap difinisi permasalahan dalam pemberitaan terkait kebijakan pemerintah bekerjasama dengan influencer dianggap sebagai pilihan yang tidak tepat. Tahap diagnosis penyebab ditunjukkan dengan ketidakpedulian generasi milenial dalam menyikapi pandemi Covid-19. Tahap penilaian moral dan etika dalam bentuk menegaskan bahwa influencer tidak dibayar dalam program ini sebagai bentuk kontribusinya kepada Negara. Sedangkan dalam rekomendasi pengobatan yang ditawarkan adalah agar pemerintah memberikan pemahaman yang kuat tentang covid-19 kepada influencer sebelum menjadi mediator untuk menyampaikan pesan kepada milenial. Media online merupakan ruang publik yang dianggap penting sebagai acuan dalam meningkatkan literasi informasi publik, sehingga pemberitaannya diharapkan lebih obyektif dan mendidik.
Prevalencia y caracterización de la infección del tracto urinario en mujeres gestantes en condiciones de vulnerabilidad social de Bucaramanga, Colombia
Authors: Ruiz-Rodríguez Myriam , Sánchez-Martínez Yuri , Suárez-Cadena Fabio Camilo , García-Ramírez Jenny Carolina
Published: November 2020

Introducción. La infección del tracto urinario (ITU) es la complicación médica más frecuente durante el embarazo y se asocia con desenlaces materno-perinatales negativos.
Objetivos. Determinar la prevalencia de ITU en gestantes en condiciones de vulnerabilidad social de Bucaramanga, Colombia, y realizar una caracterización de los casos de ITU. Además, identificar los factores asociados al desarrollo de esta complicación y el perfil de resistencia antibiótica de los microorganismos causantes de la infección.
Materiales y métodos. Se llevó a cabo un análisis secundario de los datos obtenidos en un estudio principal que incluyó 838 gestantes atendidas en la red pública de atención de Bucaramanga. La prevalencia de ITU se estimó considerando el número de gestantes con reporte de urocultivo (n=648). Se realizó un análisis descriptivo de las características de la muestra y un análisis bivariado para evaluar las diferencias en el diagnóstico de ITU. Finalmente, se estimaron los factores asociados a ITU mediante un modelo de regresión log binomial.
Resultados. La prevalencia de ITU durante el embarazo fue del 14.51% (n=94). Se observó que por cada año de aumento en la edad materna hubo una reducción del 6% en la prevalencia de ITU (RP: 0.94, IC95%: 0.90-0.98, p=0.005); además, se encontró una asociación entre tener antecedentes de ITU y desarrollar esta complicación durante la gestación (RP: 3.6, IC95%: 1.81-7.08, p<0.001). Los patógenos aislados más frecuentes fueron Escherichia Coli (75.53%) y Klebsiella spp (17.02%).
Conclusión. Cerca del 15% de las participantes tuvieron ITU, por lo que se requiere implementar estrategias de educación en salud dirigidas a las gestantes socialmente vulnerables, principalmente a las más jóvenes y aquellas con antecedentes de ITU, con el fin de reducir su ocurrencia y sus posibles consecuencias para la salud materno-fetal. Igualmente, los datos reportados aquí pueden ayudar al desarrollo de políticas públicas que busquen mejorar la prevención y atención de dicha complicación en esta población.
ARTÍCULO RETRACTADO: Fijación con placa superior versus fijación con placa antero-inferior para el tratamiento de fracturas del tercio medio de la clavícula
Authors: Martínez-Suárez José Ignacio , Ariza-Moreno Carlos Alberto , Muñoz Daissy Liliana , Chilito Carlos Ernesto , Cortés-Neira Ana Xiomara , Acosta Martínez Julian Andrés
Published: November 2020

Introducción. En población adulta, las fracturas de clavícula constituyen el 2.6% de todas las fracturas y el 35% de todas las lesiones del hombro. Existen varias técnicas quirúrgicas para el tratamiento de estas fracturas, entre ellas la fijación con placa antero-inferior y con placa superior.Objetivo. Determinar cuál es la técnica quirúrgica más efectiva y segura para el tratamiento de fracturas del tercio medio de la clavícula: fijación con placa superior o con placa antero-inferior.Materiales y métodos. Estudio observacional analítico de cohorte realizado en 96 pacientes con fracturas del tercio medio de la clavícula tratadas mediante una de estas dos técnicas quirúrgicas en un hospital de segundo nivel de Huila, Colombia. Se midieron distintos desenlaces de interés para cada técnica. El grado de satisfacción y el resultado funcional fueron evaluados mediante los cuestionarios DASH y Constant Score, respectivamente. Además, se realizó un análisis univariado, uno bivariado, y uno multivariado para caracterizar la relación entre los desenlaces medidos.Resultados. la técnica de fijación de placa superior se utilizó en 52 pacientes, y la de placa antero-inferior, en 44. Los desenlaces de interés medidos se comportaron como factor protector para el método de placa antero-inferior: sangrado intraoperatorio (RR 0.60), tiempo quirúrgico (RR 0.53), tiempo de consolidación (RR 0.56, irritación del material de osteosíntesis (RR 0.12) y retiro del material (RR 0.25). Las diferencias respecto a resultados funcionales y grado de satisfacción también fueron estadísticamente significativas (Constant Score, p=0.000; DASH, p=0.000, respectivamente).Conclusión. La técnica de fijación con placa antero-inferior demostró ser más segura y efectiva para el tratamiento de estas fracturas, logrando un mejor resultado funcional y grado de satisfacción, por lo que se recomienda su uso en estos pacientes.
Therapeutic effect of two muscle strengthening programs in patients with patellofemoral pain syndrome. A randomized controlled clinical trial
Authors: Prieto-García Luisa Fernanda , Cortés-Reyes Edgar , Lara-Cotacio Gilberto , Rodríguez-Corredor Lizeth Catherine
Published: November 2020

Introduction: Patellofemoral pain syndrome (PFPS) is one of the most common musculoskeletal disorders affecting the knee joint. Conservative treatment reduces pain and improves functional capacity in the short and medium-term.
Objective: To determine the therapeutic effect of two muscle strengthening exercise programs in patients with PFPS from Bogotá, Colombia, aged between 15 and 40 years.
Materials and methods: Experimental randomized controlled clinical trial conducted in 40 patients with PFPS from Bogotá, Colombia, aged 15-40 years, with a mild to moderate level of physical activity. Participants were randomly distributed into 2 intervention groups: Group A: 8-week-long core, hip and knee muscles strengthening exercises program; Group B: 8-week-long hip and knee muscles strengthening exercises program. The level of pain was measured using the Visual Analog Scale and the Kujala Anterior Knee Pain Scale.
Results: The addition of core muscle strengthening exercises to the traditional treatment improved the quality of life of participants in the intervention group A, where a significant reduction of pain, with a statistically significant difference in the total score of the Kujala scale (p=0.025) was observed.
Conclusions: Including core muscle strengthening exercises in the conservative management of PFPS increases its effectiveness to reduce pain and improve the quality of life of these patients.
Discursos de un grupo de docentes sobre el abordaje del eje de investigación en Lengua y Literatura
Authors: Valenzuela Baeza Carolina
Published: November 2020

Numerosos estudios han evidenciado los beneficios de desarrollar procesos en los que el alumnado debe investigar. Recientemente, el Marco Curricular nacional, en Chile, ha incluido esta perspectiva como uno de los ejes curriculares junto con los ejes de lectura, escritura y comunicación oral para la asignatura de lengua y literatura. El objetivo de este artículo es determinar en qué medida las prácticas pedagógicas declaradas por un conjunto de docentes favorecen el logro de los objetivos de aprendizaje correspondiente al eje de investigación en lengua y literatura. El artículo se realizó sobre la base del paradigma comprensivo-interpretativo, específicamente, desde una metodología cualitativa y un enfoque basado en la fenomenología hermenéutica. Como técnica de recolección de información, se utilizó la entrevista semiestructurada, la que se aplicó a cinco docentes de lengua y literatura de enseñanza media de la ciudad de Chillán en el año 2019, mientras que el proceso de análisis se llevó a cabo por medio de categorización mixta con el apoyo de Atlas.ti. Los resultados principales indican que el profesorado valora positivamente el eje de investigación, porque contribuye al desarrollo de procesos cognitivos superiores e impacta en el ámbito académico y personal del estudiantado. Sin embargo, lo integran esporádicamente en sus clases porque enfatizan los ejes curriculares contemplados en pruebas estandarizadas. Se concluye que el abordaje del eje de investigación presenta un doble desafío para el profesorado, puesto que le demanda fortalecer y profundizar su propia capacidad crítica y reflexiva para, posteriormente, desarrollar esta capacidad en sus estudiantes
Estereotipos sobre la sexualidad en la adultez mayor: un análisis desde la perspectiva de género
Authors: García Villanueva Jorge , Jiménez Delgadillo Gabriela de Jesús , Hernández Ramírez Claudia Ivonne
Published: November 2020

El objetivo de la investigación consistió en analizar los estereotipos en torno a la sexualidad en la adultez mayor de un grupo de egresados de la Licenciatura en Psicología Educativa de una universidad pública de la Ciudad de México. Se empleó una metodología cualitativa con un enfoque comprensivo-interpretativo. La técnica de recolección de información fue una entrevista semiestructurada y el instrumento una guía de entrevista; las preguntas estuvieron enfocadas en la sexualidad, los estereotipos, las percepciones sociales y las características de la adultez mayor.  En el estudio participaron siete personas tres hombres y cuatro mujeres, con un rango de edad entre 22 y 35 años. Los hallazgos revelan que la sexualidad continúa siendo un tema tabú, y en la vejez se piensa que no existe manifestación alguna de índole sexual, porque es indecente y de mal gusto. Sin embargo, la propuesta está en comprender que la sexualidad no es única y homogénea, sino que es influenciada por distintos factores, los cuales condicionan las múltiples representaciones que circundan en el imaginario colectivo y conforman subjetividades particulares.
Reflexiones del logro académico en matemáticas en evaluaciones estandarizadas: el caso de estudiantes mexicanos
Authors: Diaz López Karla Maria , Kong Toledo Ana Gabriela
Published: November 2020

En el ámbito internacional el aprendizaje de las Matemáticas ocupa un lugar instrumental en los planes y programas de estudio, dado que su propósito compromete el desarrollo de habilidades de razonamiento y resolución de problemas de la vida cotidiana. En el presente artículo se planteó como objetivo analizar los resultados del logro académico de estudiantes mexicanos en dicha materia, para lo cual se realizó una revisión documental de los resultados históricos obtenidos en dos pruebas en las que se evalúa la asignatura. A manera de reflexión se apunta la necesidad de centrar la mirada en los procesos de enseñanza-aprendizaje y, en particular, rescatar el papel de los docentes. Asimismo, como una vía o respuesta anticipada para incidir en la mejora, se valora la pertinencia de observar puntualmente y de manera directa lo que ocurre en las aulas, y con ello reivindicar el potencial del ámbito escolar en el logro académico.
The Emergence of Racialized Labor and Racial Battle Fatigue in the African American Student Network (AFAM)
Authors: Grier-Reed Tabitha , Maples Alyssa , Williams-Wengerd Anne , McGee Demitri
Published: November 2020

Although little may be new with respect to the lived experience of racialized labor for People of Color navigating whiteness and white spaces, this study is the first to identify racialized labor in everyday life. Adapting consensual qualitative research methods to a phenomenological frame, we examined 277 notes summarizing weekly discussions in the African American Student Network (AFAM) over a 13-year time period. Co-facilitated by Black faculty and graduate students, AFAM was a space for Black undergraduates to make meaning of their experiences and find community on campus. We defined racialized labor as the ongoing process of navigating hostile environments steeped in a white racial frame and identified six categories: (1) self-monitoring/self-policing; (2) flexing/making adjustments; (3) questioning; (4) affirming; (5) avoiding; and, (6) being the change or standing up for justice. Racial battle fatigue was one outcome of all the racialized labor—primarily anger, stress, frustration, hypervigilance, pressure, and exhaustion along with numbness, shock, sadness and disappointment. Both racialized labor and racial battle fatigue also occurred at the intersections of students’ lives in structural, political, and representational ways. Future studies that capture the ways in which racialized labor in everyday life is enacted by People of Color are needed. The ability to name racialized labor provides an important analytical tool for distinguishing the ongoing process of navigating racism from negative consequences such as racial battle fatigue. This line of research also has implications for creating spaces that facilitate racialized labor and wellbeing for Black people and People of Color.
Study into the feasibility of obtaining dense materials based on AlN-SiC solid solution in one stage by SHS gasostatiс processing
Authors: Akopdzhanyan T. G. , Chemagina E. A. , Borovinskaya I. P.
Published: November 2020

The synthesis and sintering of the (AlN)x(SiC)1–x solid solution were studied under the conditions of SHS gasostatiс processing at high nitrogen gas pressures (up to 110 MPa). Phase formation during the combustion of aluminum and silicon carbide mixtures with the different amount of a combustible component (aluminum content is 35 to 60 wt.%) was studied. It was shown that the optimal amount of aluminum mixed with silicon carbide to obtain a single-phase solid solution (with the complete Al conversion to AlN and without SiC dissociation) is 45–50 wt.%. A mixture with 55–60 wt.% Al leads to excessively high temperatures, which in turn leads to the silicon carbide decomposition to Si + C elements. The optimal parameters for obtaining a dense material in one stage were determined. The measured porosity and density of materials obtained demonstrated that preforming is essential for the final density of samples containing 50 wt.% Al: maximum density was achieved at a preforming pressure of 10 MPa. It was found that the 5 wt.% yttrium oxide additive increases the material density by almost 10 %. A similar effect is also obtained by increasing the initial gas pressure from 80 to 110 MPa. The maximum density in this case reached 2.7 g/cm3, i.e. 83 % of the theoretical density. The total volumetric shrinkage of the material was 10 ± 0.5 %, and this indicator can be almost completely smoothed over by the 3 wt.% boron additive. The microhardness of samples was 2000 kg/mm2.
A Computational Architecture for Inference of a Quantized-CNN for Detecting Atrial Fibrillation
Authors: Jaramillo-Rueda Andrés F , Vargas-Pacheco Laura Y , Fajardo Carlos A
Published: November 2020

Atrial Fibrillation is a common cardiac arrhythmia, which is characterized by an abnormal heartbeat rhythm that can be life-threatening. Recently, researchers have proposed several Convolutional Neural Networks (CNNs) to detect Atrial Fibrillation. CNNs have high requirements on computing and memory resources, which usually demand the use of High Performance Computing (eg, GPUs). This high energy demand is a challenge for portable devices. Therefore, efficient hardware implementations are required. We propose a computational architecture for the inference of a Quantized Convolutional Neural Network (Q-CNN) that allows the detection of the Atrial Fibrillation (AF). The architecture exploits data-level parallelism by incorporating SIMD-based vector units, which is optimized in terms of computation and storage and also optimized to perform both the convolutional and fully connected layers. The computational architecture was implemented and tested in a Xilinx Artix-7 FPGA. We present the experimental results regarding the quantization process in a different number of bits, hardware resources, and precision. The results show an accuracy of 94% accuracy for 22-bits. This work aims to be the basis for the future implementation of a portable, low-cost, and high-reliability device for the diagnosis of Atrial Fibrillation.
Filo yönetimi için büyük veri temelli yeni sürücü davranış modelleri
Authors: TERZİ Ramazan , SAĞIROĞLU Şeref , ÇÖÇÜ Özge , ARKAN Rabia , TOSUN Merve , TULGAR Yusuf
Published: November 2020

Bu çalışmada, filo yönetim
sistemlerinin eksikleri hem büyük veri hem de sürücü davranışı bakış açılarıyla
incelenmiş, gerçek veriler üzerinde sürücü/sürüş davranışları analiz edilmiş
bunun sonucunda veri analizlerini gerçekleştirmek için büyük veri tabanlı yeni
modeller önerilmiştir. Büyük veri üzerinde 6 farklı senaryo ile filodaki
sürücülerin davranış farklılıkları, çeşitli lokasyonlardaki davranışları ve
spesifik noktalardaki davranışları büyük veri temelli yaklaşımlar ile tespit
edilmiş yeni modeller geliştirilmiştir. Elde edilen sonuçlardan,  özellikle %50 üzerinde hız limiti aşan
sürücüler arasında belirli sürücülerin diğer sürücülere göre %30 oranında bu
ihlallerde payı olduğu, ortalama hızları aynı olsa bile hız ihlalleri bakımından
sürücüler arasında 6 kat farklılık olabileceği, benzer şekilde hız ihlal
sayıları aynı olsa bile ihlal sürelerinde 2 kata yakın fark olabileceği, mevsimlere
göre hız ihlal sayısının en fazla yaz mevsiminde fakat ihlal süresinin en fazla
sonbaharda olduğu, Ankara ili içinde hız limitlerini aşmaya olanak sağlayan
yolların ilçe bazında %23,6 oranıyla Yenimahalle, mahalle bazında %4,62 oranı
ile Saray, şehirlerarası yol bazında %6,85 oranı ile Eskişehir yolunun, şehir
içi yollarda ise %2,74 oranı ise Anadolu Bulvarı olduğu, son olarak ise radar
noktaların yaklaşık 1 kilometre öncesi ve sonrası hız ihlal sayılarına göre 3
farklı radar noktası incelemesinde %300’e yakın oranlarda farklılıkların
oluştuğu tespit edilmiştir. Sonuç olarak büyük veri analitiği kullanarak
filoların sürücü/sürüş davranış kapsamında daha etkili kullanılabileceği ve
daha kolay yönetilebileceği, gerek maliyet gerekse iş gücü kaybının önlenmesi
için bu modellerden faydalanılabileceği, Ankara ili için yapılan bu analizlerin
diğer iller için de kullanılabileceği, radar noktalarında yapılan analizler
gibi farklı değerler üretilebileceği değerlendirilmektedir.
Kompozit eklemeli imalat için polimer matrisli sürekli fiber takviyeli kompozit parça üretilebilirliğinin araştırılması
Authors: ERMURAT Mehmet , GEBEL Muhammed Enes
Published: November 2020

Eklemeli
imalat ürünlerin CAD verilerinin geometrik olarak bölünmesi ve bu
bölümlerin fiziksel olarak birbirine eklenmesiyle üretimin
gerçekleştirildiği bir imalat teknolojisidir. Eklemeli imalatta
her geçen gün malzeme ve proses çeşitliliği hızla artmaktadır.
3D yazıcı olarak da isimlendirilen bu yöntemlerle karmaşık
geometriler kolayca üretilebilmektedir. Polimer esaslı eklemeli
imalat yöntemleri ile üretilen parçalar düşük mekanik
özelliklere sahip olmaktadır. Endüstriyel kullanım için daha
yüksek mekanik özellikler gerekmektedir. Bu sorunu aşmak için
polimer matrisli kompozit parça üretimi çalışmaları
yapılmaktadır. Kompozit malzeme için kullanılan takviye
malzemesinin toz veya kesintili parçacıklı formda olduğu çeşitli
çalışmalar yapılmış ve kısmen başarılı sonuçlar
alınmıştır. Son zamanlarda ise daha yüksek mukavemete sahip
olan parçalar elde edebilmek için sürekli fiber takviye
malzemesinin kullanımı üzerine yapılan çalışmalar artmaktadır.

Bu
çalışmada; matris malzemesi olarak ışıkla kürlenen epoksi
reçine, takviye malzemesi olarak sürekli cam/karbon fiber
kullanılarak bir eklemeli imalat prosesi geliştirilmiştir.
Kompozit parça üretiminde ilk adım olarak kompozit fiberin
üretilmesi için bir nozul tasarlanmış ve üretilmiştir. UV ışık
güç yoğunluğu ve kullanılan nozul çapı değişken parametreler
olarak irdelenmiş, çalışmalarda takviye malzemesi olarak karbon
ve cam fiber kullanılarak kompozit fiber üretiminde kürlenme
davranışları incelenmiştir.