bluuebunny/crossref_metadata_2025 huggingface dataset:
Broadband high-resolution microwave frequency measurement based on photonic undersampling via using three cavity-less optical pulse sources with coprime repetition rates
Authors: Zhang Xuyan , Peng Di , Ma Yangxue , Wang Botao , Wang Mengke , Li Zhengkai , Zhang Zhiyao , Zhang Shangjian , Li Heping , Liu Yong
Published: August 2020

A photonic-assisted broadband and high-resolution microwave frequency measurement scheme is proposed and demonstrated based on undersampling via using three cavity-less optical pulse sources with coprime repetition rates. After undersampling by three ultrashort pulse trains with repetition rates in the order of gigahertz, input microwave signal is down-converted to three intermediate-frequency (IF) signals located in the first Nyquist frequency range. Through measuring the frequencies of the IF signals via fast Fourier transform after digitization by the commercially available analog-to-digital convertors, the input microwave signal frequency can be retrieved based on the frequency identification algorithm. In the proof-of-concept experiment, three ultrashort pulse trains with repetition rates of 2.99, 3.07, and 3.10 GHz are generated by a cavity-less optical pulse source, where the pulse widths are 9.5, 9.6, and 9.8 ps, respectively. Through using these three ultrashort optical pulse trains, a frequency measurement range up to 40 GHz is realized, where the frequency measurement error is less than

±

5

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, and the spurious-free dynamic range is

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.
Performance analysis of different intensity modulation techniques over atmospheric turbulent free-space optical channels
Authors: Abdelhak Sara S. , Morra Ahmed E. , Abd El-Samie Fathi E. , Elfiqi Abdulaziz E.
Published: August 2020

In this paper, we introduce a comprehensive study of the performance of
intensity modulation (IM) techniques over gamma–gamma (GG) distributed
free-space optical (FSO) channels. We derive closed-form expressions
for the average bit error rate (BER) of thermal-noise-limited FSO
systems adopting various IM techniques. The effect of atmospheric
turbulence is studied. Comparisons are presented in terms of the
transmitted peak power to achieve a certain BER. Results show that
on–off keying, pulse amplitude modulation, and expurgated
pulse-position modulation (EPPM) provide superior performance compared
to other IM techniques. In addition, a proposal to reduce the
peak-to-average power ratio (PAPR) of orthogonal frequency division
multiplexing (OFDM) is introduced by adding another modulation layer
of EPPM. A closed-form expression for the average BER of the proposed
hybrid OFDM–EPPM technique over GG turbulent FSO channel is derived.
Moreover, an expression for the outage probability of the FSO system
adopting the proposed OFDM–EPPM technique is presented. Results are
investigated and compared to those of traditional OFDM and hybrid OFDM
with PPM (OFDM–PPM). It is shown that the hybrid OFDM–EPPM technique
outperforms the hybrid OFDM–PPM technique for the same data rate.
Moreover, the hybrid OFDM–EPPM technique allows higher data rates with
lower PAPR values compared to those of the hybrid OFDM–PPM technique
for the same number of time slots.
High-resolution micro channel-cut crystal monochromator processed by plasma chemical vaporization machining for a reflection self-seeded X-ray free-electron laser
Authors: Matsumura Shotaro , Osaka Taito , Inoue Ichiro , Matsuyama Satoshi , Yabashi Makina , Yamauchi Kazuto , Sano Yasuhisa
Published: August 2020

A high-resolution micro channel-cut crystal monochromator (µCCM) composed of an Si(220) crystal is developed for the purpose of narrowing the bandwidth of a reflection self-seeded X-ray free-electron laser. Subsurface damage on the monochromator, which distorts the wavefront and broadens the bandwidth of the monochromatic seed beam, was removed by using a plasma etching technique. High diffraction performance of the monochromator was confirmed through evaluation with coherent X-rays. Reflection self-seeding operation was tested with the Si(220) µCCM at SPring-8 Angstrom Compact free-electron laser. A narrow average bandwidth of 0.6 eV, which is five times narrower than the value previously reported [I. Inoue et al., Nat. Photonics 13, 319 (2019)10.1038/s41566-019-0365-y], was successfully obtained at 9 keV. The narrow-band X-ray beams with high intensity realized in this study will further expand the capabilities of X-ray free-electron lasers.
Radiative thermal switch driven by anisotropic black phosphorus plasmons
Authors: He Ming-Jian , Qi Hong , Ren Ya-Tao , Zhao Yi-Jun , Zhang Yong , Shen Jia-Dong , Antezza Mauro
Published: August 2020

Black phosphorus (BP), as a two-dimensional material, has exhibited unique optoelectronic properties due to its anisotropic plasmons. In the present work, we theoretically propose a radiative thermal switch (RTS) composed of BP gratings in the context of near-field radiative heat transfer. The simply mechanical rotation between the gratings enables considerable modulation of radiative heat flux, especially when combined with the use of non-identical parameters, i.e., filling factors and electron densities of BP. Among all the cases including asymmetric BP gratings, symmetric BP gratings, and BP films, we find that the asymmetric BP gratings possess the most excellent switching performance. The optimized switching factors can be as high as 90% with the vacuum separation d=50 nm and higher than 70% even in the far-field regime d=1 µm. The high-performance switching is basically attributed to the rotatable-tunable anisotropic BP plasmons between the asymmetric gratings. Moreover, due to the twisting principle, the RTS can work at a wide range of temperature, which has great advantage over the phase change materials-based RTS. The proposed switching scheme has great significance for the applications in optoelectronic devices and thermal circuits.
Enhancement of the optical properties of CsPbBr3 perovskite nanocrystals using three different solvents
Authors: Wook Kang Tae , Lee Sol , Ji Park Young , Jin Jeong Gyu , Su Kim Jong , Bae Byungseo , Hwang Jonghee , Kim Sun Woog
Published: August 2020

Green-emitting

C
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3

perovskite nanocrystals were synthesized by the modified hot-injection method using three different solvents. The produced nanocrystals showed a narrow green emission band centered at 515–520 nm with full width at half-maximum (FWHM) values of approximately 18–20 nm. The highest photoluminescence quantum yield (PLQY) was obtained for the nanocrystal sample synthesized using a paraffin liquid solvent, with a value of 70.1% under excitation at 450 nm. The

C
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nanocrystals film light-emitting diodes (LED) chip module showed a luminous efficacy of

40.7

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. The white LED (WLED) with green

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and red

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nanocrystal films emitted bluish-white light with a high color rendering index of 89, and the luminous efficacy of the WLED reached

16.3

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Potential of crystals with a nonuniform doping profile for a Fe2+:ZnSe laser
Authors: Alekseev E. E. , Kazantsev S. Yu. , Podlesnikh S. V.
Published: August 2020

Special nonuniform doping profiles are proposed for Fe2+:ZnSe crystals, which can increase the output energy of Fe2+:ZnSe lasers in comparison with those based on active elements with a uniform distribution of the doping agent. We present the simulation results for thermoelastic stresses and distortions of the optical density that arise in a Fe2+:ZnSe crystal during pulsed pumping, with the Fe distribution profile in the ZnSe crystal being nonuniform both along the optical axis and in the transverse direction. It is shown that the proposed doping profile provides a reduction in the thermo-optical distortions along the optical axis as well as suppression of parasitic lasing in the transverse direction.
Continuous tracking of moving objects in long-distance imaging through a turbulent medium using a 3D point cloud analysis
Authors: Maor Or , Yitzhaky Yitzhak
Published: August 2020

Preserving object detections and maintaining continuous, uninterrupted tracking routes of moving objects is a difficult challenge in long-distance imaging through a turbulent medium that extremely degrades the video. We introduce a new method for the continuous tracking of moving objects in such conditions. First, a number of steps are applied, including global video stabilization, reduction of local oscillations, and finding spatio-temporal “suspicious sections” in the video that may contain moving objects. This phase produces a 3D point cloud that represents suspicious moving objects. Subsequently, the possible routes in the cloud are analyzed, producing the final routes. A comparison to the current standard shows an improvement in the object tracking stability.
STRATIFY: a comprehensive and versatile MATLAB code for a multilayered sphere
Authors: Rasskazov Ilia L. , Carney P. Scott , Moroz Alexander
Published: August 2020

We present a computer code for calculating near- and far-field electromagnetic properties of multilayered spheres. STRATIFY is a one-of-a-kind open-source package that allows for efficient calculation of electromagnetic near-field, energy density, total electromagnetic energy, and radiative and non-radiative decay rates of a dipole emitter located in any (non-absorbing) shell (including a host medium), and fundamental cross-sections of a multilayered sphere, all within a single program. Because of its speed and broad applicability, our package is a valuable tool for analysis of numerous light scattering problems, including but not limited to fluorescence enhancement, upconversion, downconversion, second harmonic generation, and surface enhanced Raman spectroscopy. The software is available for download from GitLab as Code 1.
This must be the place: Venues and urban space in underground music scenes
Authors: Schmisek John
Published: August 2020

Art subcultures, and music scenes in particular, have featured prominently in academic discourse on gentrification in the neo-liberal city. Although scholarly accounts have done much to clarify the process through which music scenes become implicated and entangled within wider patterns of urban transformation and redevelopment, these studies often leave us with a flattened and undertheorized picture of the scenes themselves. Departing from David Ley’s conception of the ‘cultural field of gentrification’, I sketch out an analytical framework for understanding the heterogenous and contested character of music scenes in the face of urban change, focusing on a case study of the underground music scene in Rome’s Pigneto neighbourhood in 2017. As variegated waves of scene participants drift into new spaces, scenes coalesce into distinct territories, administered by venues and delineated by ‘scene ideologies’ – matrices of ethical and aesthetic values and judgements constituting a collective scene habitus. This complicates any facile conception of artistic communities as either unwitting agents of gentrification or isolated underground enclaves; rather, premised on collective rituals of aesthetic judgement and differentiation, music scenes constitute a continuum of cultural production whose spatial practices both generate and subvert conditions for their eventual appropriation by market forces.
Post-socialist transition and serial displacement in the Czech movie Horem Pádem (Up and Down) (2004)
Authors: Romeyn Esther
Published: August 2020

This article analyses the way Horem Pádem (Up and Down, 2004) registers the neo-liberalizing effects of the post-socialist transition on urban space and urban sociality in its representation of Prague. The transition involved an ideological and ethical reorientation that challenged definitions of value and worth. Moreover, through the remaking of the urban environment, neo-liberalization is a contextually embedded process that restructures the conditions of the everyday. Post-transition, Prague was claimed by the logic of post-industrial capital accumulation, with investment in retail and tourist facilities transforming the urban core into a new consumption landscape. I argue that the film’s exploration of the relationship between urban space and identity maps the dislocations produced by the insertion of the periphery of Europe into the neo-liberal space of flows, and the serial displacements that are its effects. Rebordering, de-territorialization and displacement are the key metaphors through which the film captures the emotional horizons of the characters caught up in the multi-scalar reconfiguration of economy, society and space. The narrative presents itself as an allegory of Czech nationhood, whose insertion into a rescaled, capitalist Europe the ‘little people’ populating Hrejbek’s film meet with an admixture of opportunism, disaffection, tribalism and defensive localism.
Promotion of improved rice parboiling technology in the Innovation Platforms in
Sierra Leone
Authors: Bangura Kemoh , Mahmood Nazir A. , Bangura Abdulai , Moreira Jean
Published: August 2020

In this study, 20 local artisans were trained on the fabrication of improved rice parboiling technology. 100 women and 50 men were trained on the use of the improved parboiling technology. Participants were selected from female and male farmers from different farmer-based organizations. The scaling-out of this technology to the rice sector development hubs in Sierra Leone will reduce the constraints related to the traditional parboiling process and improve the productivity and quality of the parboil rice in conformity with the market demand. It will also help to increase the income of the actors along the rice value chain.
Evaluation of 2018 Turkish early childhood teacher education curriculum
Authors: Tican-Başaran Semra , Aykaç Necdet
Published: August 2020

This study aims to examine the characteristics of the Turkish Early Childhood Teacher Education Curriculum updated in 2018 and reveal the views of university lecturers as its end users. In the first stage of the study, previous and updated curricula were examined in order to reveal the characteristics of the latter, in the second stage, the curriculum-related views and recommendations of lecturers from private and public universities in Turkey were obtained. Increased number of elective courses was the most favored characteristic of the new curriculum while lack of flexibility, less practicum, and the failure of certain new courses to meet needs were the negative aspects. Increasing practicum and ensuring the participation of all stakeholders in the curriculum development process were the most vociferous recommendations of the lecturers.
Why Russell Was Not an Epistemic Structural Realist
Authors: Elkind Landon D. C. , Shipley Jeremy
Published: August 2020

Bertrand Russell’s work in philosophy of science has been identified as a progenitor of structuralism in contemporary philosophy. It is often unclear, however, how the philosophical problems facing contemporary structuralist programmes relate to the problems of philosophy as Russell saw them. We contend that Russell has been mistakenly identified as an epistemic structural realist. The goal of this essay is to clarify the relationship between Russell’s programme and contemporary structuralist projects. In doing so, we hope to display the motivation for a broad, truly Russellian structuralist project in the philosophy of science.
Notes on McTaggart's Lectures on Lotze
Authors: Russell Bertrand , Milkov Nikolay , Blackwell Kenneth
Published: August 2020

Russell preserved notes he took on McTaggart’s course on Lotze’s major works in 1898. They are published here for the first time. Russell’s abbreviations are expanded and deletions noted. N. Milkov introduces the notes and provides Russell’s biographical and philosophical background. The course on Lotze, on whose philosophy of geometry Russell had already written,  was influential in his development away from monism.
2008–2017 Emergency Department-Treated Ice Hockey Injury Estimates
Authors: Yang Ted
Published: August 2020

This Consumer Product Safety Commission (CPSC) report presents annual estimates of the number of emergency department-treated, ice hockey-related injuries in the United States in a ten-year period from 2008 through 2017. These estimates are based on CPSC's National Electronic Injury Surveillance System (NEISS) data, where sampling weights are used to project the cases from NEISS hospitals to national estimates. The advantages of using NEISS data include the ability to determine the estimated number of injuries and the percentage distribution for the most common injury types, the month of the year in which they occurred, the most common injury locations, gender, the most common injuries by gender, age groups (younger than 15 years old, 15 to 18 years old, older than 18 years old), and hospital disposition, provided in the form of tables and figures. However, since the scope of NEISS data is limited to emergency department (ED)-treated injuries, the data alone should not be used to estimate all ice hockey injuries or determine the risk of injury due to the lack of a sample population denominator. The main objective of this report is to review ice hockey-related injury types with respect to age group and identify any statistically significant linear trends based on the estimated annual number of ED-treated injuries since the Fifth International Symposium on Safety in Ice Hockey held May 4–5, 2008. A secondary objective involving specific review of incidents in the United States from January 1, 2008, to March 9, 2018, based on detailed reports in CPSC's Consumer Product Safety Risk Management System (CPSRMS), supplements the primary section on injury estimates. The purpose of this review is to investigate the hockey equipment involved with a particular injury type. This report includes a section summarizing key findings based on the results, as well as an appendix to explain the methodology for the data collection.
Comparison of Head Impact Frequency and Magnitude for Midget and Junior Ice Hockey Players to Inform Safety and Policy
Authors: McMunn Leah E. , Hoshizaki Thomas B. , Robidoux Michael , Gilchrist Michael D. , Karton Clara , Post Andrew
Published: August 2020

Hockey Canada reports Junior hockey players have a greater incidence of mild traumatic brain injury when compared to Midget hockey players. Very little research has been undertaken to understand the differences in impact events, frequency, and magnitude that contribute to these differences in brain injury incidence. Videos of 20 Midget and Junior ice hockey games were analyzed to determine the frequency and magnitude of head impact events. Physical reconstructions of the head impact events were conducted using a Hybrid III headform to obtain the linear and rotational acceleration characteristics. Linear and rotational acceleration data were used for finite element modeling to calculate the peak maximum principal strain within the cerebrum. The results demonstrated that while Midget and Junior ice hockey players had similar head impact frequencies during play (p = 0.0912), Junior players experienced a greater number of total impacts to the head after the whistle (p = 0.0079). When the impacts during play were broken down by event type, punches to the head (p = 0.0192) and shoulders to the head (p = 0.0290) were found to be more frequent at the Junior level. The collected data identified similar magnitudes of head impact but differences in the frequency between Midget and Junior hockey. Enforcing existing rules and forming additional policy and regulations surrounding protective measures for athletes to manage shoulder and punch impacts to the head, both during play and after the whistle, may decrease the player's risk of brain trauma in the sport.
50 Years of Safety in Ice Hockey: What Have We Learned and Where Do We Need to Go?
Authors: Bishop Patrick J.
Published: August 2020

This work deals with summarizing fifty years of safety in ice hockey conducted by ASTM Subcommittee F08.15 on Sports Equipment, Playing Surfaces, and Facilities. It provides a brief review of the standards created and of the five previous symposia on safety in ice hockey and other symposia dealing with significant traumatic injury presented by Subcommittee F08.15 over the years. It also briefly examines three areas in which future developments may be of significance: Can concussion risk reduction be achieved through helmet standards modification? Is a helmet standard needed for youths and females? Is there a need to modify ASTM F1587, Standard Specification for Head and Face Protective Equipment for Ice Hockey Goaltenders, the goaltender head and face protector standard? Reasons for asking these questions and some of the requirements needed to effect these modifications are briefly discussed.
Growth estimates for the maximal term and central exponent of the derivative of a Dirichlet series
Authors: Fedynyak S.I. , Filevych P.V.
Published: August 2020

Let $A\in(-\infty,+\infty]$, $\Phi:[a,A)\to\mathbb{R}$ be a continuous function such that $x\sigma-\Phi(\sigma)\to-\infty$ as $\sigma\uparrow A$ for every $x\in\mathbb{R}$, $\widetilde{\Phi}(x)=\max\{x\sigma -\Phi(\sigma):\sigma\in [a,A)\}$ be the Young-conjugate function of $\Phi$, $\overline{\Phi}(x)=\widetilde{\Phi}(x)/x$ and $\Gamma(x)=(\widetilde{\Phi}(x)-\ln x)/x$ for all sufficiently large $x$, $(\lambda_n)$ be a nonnegative sequence increasing to $+\infty$, and $F(s)=\sum\limits\limits_{n=0}^\infty a_ne^{s\lambda_n}$ be a Dirichlet series such that its maximal term $\mu(\sigma,F)=\max\{|a_n|e^{\sigma\lambda_n}:n\ge0\}$ and central index $\nu(\sigma,F)=\max\{n\ge0:|a_n|e^{\sigma\lambda_n}=\mu(\sigma,F)\}$ are defined for all $\sigma<A$. It is proved that if $\ln\mu(\sigma,F)\le(1+o(1))\Phi(\sigma)$ as $\sigma\uparrow A$, then the inequalities $$ \varlimsup_{\sigma\uparrow A}\frac{\mu(\sigma,F')}{\mu(\sigma,F)\overline{\Phi}\,^{-1}(\sigma)}\le1,\qquad \varlimsup_{\sigma\uparrow A}\frac{\lambda_{\nu(\sigma,F')}}{\Gamma^{-1}(\sigma)}\le1, $$ hold, and these inequalities are sharp.
Making Courageous Conversation in Healthcare (Part I)
Authors: Bunniss Suzanne
Published: August 2020

Values Based Reflective Practice (VBRP®) was first developed by National Health Service (NHS) Education for Scotland in 2011 to help health and social care staff have courageous conversations about the relationship between who they are and what they do at work. The stated hope of VBRP® is to help staff reclaim a sense of meaning and purpose in their professional lives, and reawaken the memory of why they chose to work in a caring vocation. This article describes the history and development of VBRP®, the elements of this reflective practice model, and presents the first quantitative evaluation of VBRP® training with evidence gathered from 138 healthcare, social care, and third sector workers. This study is the first of a two-part series; the second article (Part II) locates VBRP® within healthcare literature concerned with “soul and role,” and it presents further qualitative evidence for and wider discussion of the model.
Systemics of Violent Religious Nationalism
Authors: Kiper Jordan , Sosis Richard
Published: August 2020

What universal features of the mind interact with specific ecologies to produce expressions of violent religious nationalism? To shed light on this question, we focus on a case study of the Yugoslav Wars, asking: How did different religious groups in the Balkans move from cooperative relationships to violent ones? We argue that the most prevalent theories invoked to answer this question fail to adequately explain the change, namely, both the rise and fall of violent religious nationalism in the Balkans. To that end, we employ a systemic framework of religious change to examine historical data and ethnographic interview excerpts from ex-fighters and survivors of the Yugoslav Wars. This framework takes religion as it is practiced by communities to be a complex adaptive system, and models how religions adapt to local socioecologies. In employing this framework, three questions are addressed: (1) What features of cognition contributed to religiously motivated mass violence; (2) Which constituents of the religious system triggered those features; and (3) What socioecological factors were those constituents responding to? We argue that popular support for religious violence—and eventually its rejection—involved a set of higher-order functions, which McNamara calls the centralized executive self. This decision-making system was decentered by religious specialists who raised social pressures; group rituals that sustained community engagement; and identity-markers that signaled group commitments. While support for violence was a response to community threats during state-level succession, the eventual rejection of violence by religious leaders and communities was due to socioecological factors, such as rising health threats and declining birth rates brought about by the wars.
Women-Centered Rituals and Levels of Domestic Violence
Authors: Stockly Kate J. , Arel Stephanie , DeFranza Megan K. , Ruck Damian , Matthews Luke , Wildman Wesley
Published: August 2020

Prior research indicates that ritual can be a source of social solidarity by signaling trustworthiness and group commitment. A separate line of research expects domestic violence against women to be more common in societies with post-marital residence at the husband’s birthplace (i.e. patrilocality). Thus, we hypothesized that when wives are able to construct strong bonds with the female members of their communities through solidarity-building rituals, they gain social support capable of inhibiting violence, leading to lower overall levels of domestic violence--especially in patrilocal societies. Results indicated that certain types of women-centered rituals were associated with lower levels of sexual and domestic violence; however, we found inconsistent effects according to patrilocal residence. Women-centered rituals were not found to be associated with beliefs about the husband’s prerogative to punish and dominate his spouse, and patrilocality did not contribute to the effects we found.
Special Issue Introduction: Religious Diversity and the Cognitive Science of Religion
Authors: Shaver John H. , Kavanaugh Christopher M.
Published: August 2020

Special Issue Introduction
Working paper respecto a la relación entre los motivos y la intención de compra en marcas propias de productos de la categoría de mercado básico ofertados en hipermercados
Authors: Rodríguez Acuña Jenny Marcela
Published: August 2020

Entendiendo que el presente documento constituye un "Working Papers" cuyo propósito es alojar el avance de los proyectos de investigación desarrollados en la Maestría de la IUPG, bajo la categoría de "literatura gris" proyectado a un artículo publicable en revista indexada, el resumen de este documento consiste en la oferta y demanda de marcas propias es un fenómeno del marketing de progresivo desarrollo en los últimos años. Desde tal punto de vista, existen diversos factores asociados a su comercialización que se relacionan con la intención de compra;  desde el punto de vista del consumidor, los establecimientos en donde predominan estas marcas y la gestión que realizan las empresas para satisfacer las necesidades de los clientes son importantes para determinar los motivos por los cuales se prefieren estas marcas sobre otras. Desde tal perspectiva, la presente investigación tiene como principal objetivo analizar la relación entre los motivos y la intención de compra en marcas propias en productos de la categoría de mercado básico ofertados en los principales hipermercados de la ciudad de Bogotá.
Working paper respecto a los Factores relevantes en la experiencia de marca de las actividades de Realidad Aumentada en escenarios comerciales en Bogotá
Authors: Gonzalez Rodriguez Christian Alexis
Published: August 2020

Entendiendo que el presente documento constituye un "Working Papers" cuyo propósito es alojar el avance de los proyectos de investigación desarrollados en la Maestría de la IUPG, bajo la categoría de "literatura gris" proyectado a un artículo publicable en revista indexada, el resumen de este documento consiste en: identificar los factores relevantes en la experiencia de marca de las actividades de Realidad Aumentada en escenarios comerciales en Bogotá.

 
lealtad de marca en compra de cosmeticos
Authors: Cardona Erika Andrea
Published: August 2020

Las empresas pueden sobrevivir al mercado actual si generan relaciones estables aprendiendo a conocer al consumidor en las áreas comportamentales, cognitivas y afectivas al momento de comprar un producto en la categoría de cuidado facial y analizar qué tan leales son los consumidores de esta categoría.

La lealtad de marca en esta investigación se percibe con varios aspectos  como: los  económicos, las necesidades de consumo, actitud, entre otros.

Los consumidores buscan un producto que supla una necesidad básica o tal vez un producto con múltiples beneficios, las grandes empresas juegan con este tipo de necesidades y ven oportunidades de mercado creando productos que ofrecen una solución a problemas físicos como: arrugas, manchas, ojeras etc.

Es importante resaltar como el mercado ha venido evolucionando con nuevas marcas, tendencias y tecnologías.
En esta investigación queremos conocer que  factores determinan lealtad de marca de cosmeticos.
Red Iberoamericana para la Competitividad, Innovación y Desarrollo
Authors: Ramírez Triana Carlos Ariel , Pineda Escobar Maria Alejandra , Cano Niño Mauricio Alejandro , Mora Pardo Sergio Alberto
Published: August 2020

En Colombia, actualmente el principal ente rector de la Innovación es el denominado Sistema Nacional de Competitividad, Ciencia, Tecnología e Innovación (SNCCTeI). En su página web el mismo se autodefine como el
“conjunto de leyes, políticas, estrategias, metodologías, técnicas y mecanismos, que implica la gestión de recursos humanos, materiales y financieros de las entidades de la administración pública en coordinación con los del sector privado, así como las entidades del Estado responsables de la política y de la acción en los temas relacionados con la política competitividad, productividad e innovación”. (SNCCTeI, 2016)
El SNCCTeI surge de la integración del Sistema Nacional de Competitividad e Innovación1 con el Sistema de Ciencia, Tecnología e Innovación; consolidando de esta manera un único Sistema de Competitividad, Ciencia, Tecnología e Innovación. Esta integración se oficializa con el Artículo 186 de la Ley 1753 de 2015, correspondiente al Plan Nacional de Desarrollo que rige para el periodo 2014-2018.
New approach for evaluating chloride ion penetration of mortar in cold environments
Authors: Bai Shuai , Guan Xinchun
Published: August 2020

The aim of this paper was to use the surface fractal dimension (Ds) to evaluate the chloride ion penetration of cement mortar in extremely cold regions. Pore structure is a critical factor that influences the permeability of cement mortar. This study investigated surface fractal dimensions of the pore structure of cement mortars, which were subject to one-time freezing for 7 days after casting. A thermodynamic model was applied to calculate Ds on the basis of mercury intrusion porosimetry data. The results show that the pore structures of all specimens exhibit the scale-dependent fractal property, and three distinct fractal regions (I, II, III) are obtained. According to the regression analysis results of fractal dimension and pore structure parameters, it was found that the fractal dimension can characterise the complexity and chaos of pore structure and predict pore size distribution. Based on this, a linear regression between chloride diffusion coefficient (Dnssm) and Ds in fractal regions was carried out. The results show that Ds of micro pores (region I) have good correlation with Dnssm, up to 0.92908, which is more accurate than the porosity. An index of surface fractal dimension is proposed to evaluate the durability of concrete buildings in extremely cold regions.
Seismic performance of imperfect unanchored tanks
Authors: Miladi Sina , Razzaghi Mehran S. , Ghasemi Seyed Hooman
Published: August 2020

Liquid storage tanks play a significant role in storing hazardous liquids in process industries. Hence, their proper seismic performance is considerably important to prevent the catastrophic consequences of tank failure. This study focuses on seismic safety assessment of oil storage tanks. To this end, four unanchored tanks of various height-to-diameter ratios (H/D) were considered and their elastic and inelastic buckling failures were studied, as well as their uplifting behaviour. To this end, incremental dynamic analysis was employed in an Abaqus platform using the lateral seismic excitations. Different patterns of random geometric imperfections of various amplitudes were considered in the tank models. The Budiansky–Roth procedure was followed to calculate the buckling capacities of tank shells. The results of this study revealed that the imperfection has a small but notable effect on buckling capacity of tank shells, but its effect on tank uplift is negligible.
Bond performance of grouted tendons at elevated temperatures
Authors: Wu Xi-qiang , Huang Ting , Zhang Li , Au Francis Tat Kwong
Published: August 2020

The bond between tendons and grout is crucial to the performance of bonded post-tensioned concrete structures. To study the bond performance of grouted tendons at elevated temperatures, pull-out tests were conducted on specimens comprising either a mono- or multi-strand tendon located centrally within a grouted duct inside a concrete cylinder, at test temperatures of 20–600°C. It was found that the bond strength deteriorated with a rise in temperature and the degradation of bond strength was more severe than that of other mechanical properties. Three types of failure mode were observed: pull-out, partial splitting and through splitting. The use of a smaller duct could improve the bond strength of specimens failing in pull-out mode. The influence of the strength of the outer concrete was found to be insignificant. Based on the distinct bond behaviour of different failure modes, a bond–slip model was developed by regression of the test results.
Perspectiva Kuhniana sobre a Ciência Contábil: do surgimento do paradigma ao período de crise
Authors: Lima Rafael Sousa , Serrano André Luiz Marques , Ferreira Lucas Oliveira Gomes
Published: August 2020

O objetivo deste trabalho é discutir a ciência contábil do ponto de vista da teoria Kuhniana. O estudo enquadra-se como ensaio teórico, em que se busca, com base em pesquisa bibliográfica, expor ideias e refletir sobre conceitos. Para tanto, apresenta-se ao leitor breve contexto histórico sobre o desenvolvimento do conhecimento contábil, mostrando as transformações pelas quais passou esse campo de estudo e a sua busca pelo amadurecimento enquanto ciência, seja normativa ou positiva. Também são analisadas as características do processo científico kuhniano, abordando-se as fases de formação de uma ciência e de seus paradigmas. Assim, propõe-se uma estrutura kuhniana para a ciência contábil, tendo como foco os séculos XX e XXI, com enquadramento da obra A Statement of Basic Accounting Theory (AAA, 1966) como marco inicial do (novo) período científico da contabilidade. Ainda, foram analisados aspectos relacionados às estruturas conceituais, apontando-se críticas ao framework vigente. Por fim, sustenta-se que a contabilidade vive um período de crise enquanto ciência, pois seu paradigma estaria em “xeque” ao não mais oferecer soluções às questões emergentes do campo, abrindo-se oportunidade para um novo paradigma contábil baseado em tecnologia. Como sugestão para pesquisas futuras, indica-se uma abordagem multidisciplinar na contabilidade com a introdução de técnicas de Big Data na produção do conhecimento contábil.
Los factores internos de las pymes y su influencia en la competitividad. Caso sector comercio en Lázaro Cárdenas, Michoacán, México
Authors: Almanza Jiménez Rebeca , Calderón Campos Patricia , Vargas Hernández José G.
Published: August 2020

El presente estudio pretende identificar los factores internos y externos que influyen en la competitividad de las pymes del sector abarrotero de Lázaro Cárdenas (Michoacán) debido a que la competitividad es un aspecto que adquiere cada vez mayor relevancia en el ámbito empresarial, lo cual se deriva de las exigencias del entorno económico enmarcado en el proceso de la globalización. El desarrollo del sector privado y particularmente de las pymes es de suma relevancia, en especial en sus factores internos como son: planeación estratégica; capital humano; innovación; productividad; sistemas de información y aseguramiento de la calidad; los cuales resultan cruciales para hacer un uso eficiente de sus recursos y a la vez alcanzar grandes niveles de productividad y competitividad.
Cytotoxicity assay using LLC-MK2 cell line v1
Authors: not provided luanaborba
Published: August 2020

Protocol that described the cytotoxicity assay using a mammalian epithelial cell line (LLC-MK2; ATCC CCL-7).
Collection of samples (cloacal swabs) from wild birds v1
Authors: Sawyerr Louisa , Ntiamoa-Baidu Yaa , Erasmus Henaku Owusu not provided , Boniface Baboreka Kayang not provided
Published: August 2020

Resistance to antimicrobial agents is a growing concern in public health. Antimicrobial resistance (AMR) has been reported in wildlife from several places in the world though wild animals are not normally exposed to clinically used antimicrobial agents. Despite this, very little research has been done in Ghana to determine antimicrobial resistance in wild animals, particularly those in protected areas.This protocol provides steps on how forest birds were trapped and samples were collected for laboratory examination.
ANALYSIS OF TIGHT GAS RESERVOIRS AND LITHOLOGICAL-PETROPHYSICAL ASSESSMENT OF UPPER AND MIDDLE CARBONIFEROUS STRATA OF SVYATOGORSKA AREA
Authors: Oliinyk O. , Antoniuk V. , Bezrodna I. , Vyzhva S.
Published: August 2020

The paper concerns the analysis of the world practice in the study of tight gas reservoirs and some of their lithological and petrophysical properties are demonstrated on the example of Svyatogorska Area perspective intervals. The purpose of this work is to establish the features of petrophysical properties of tight gas reservoirs from the upper and middle Carboniferous strata of Svyatogorska area according to laboratory and well logging data and matching the obtained geophysical results with lithological composition and mineral structure of rocks to assess gas prospects. The laboratory investigation on core samples included petrographic and petrophysical analysis of rocks. The effective porosity cutoff value for tight gas reservoirs of the studied area is 4,5 % under reservoir conditions and 4 % in the laboratory settings. 130 core samples were selected, for which the effective porosity is larger than the cutoff value. The histogram of effective porosity and absolute permeability distribution for tight gas intervals shows that PHI is in the range of 4–7 % and K – 0.01–2 mD (the largest number of samples has K – 0.01 mD). Conducted analysis of the micropetrographic study results of the core material showed that the matrix of the Moscowian stage rocks takes an average of 70 % from the volume, represented by 41-47 % quartz, 3 - 10.5 % – feldspar and 2.1–6 % – mica minerals. Cement is represented mainly by illite clay component (14–17.5 %) with calcite content (3–8.75 %). According to the formation evaluation of the well logging data clay volume, effective porosity and gas saturation were calculated for the well N10 Svyatogorska area. The intervals: 3836.4–3866.6 m and 4107.6–4140,4 4 m were indicated as tight gas reservoirs. The effective porosity of promising formations varies in the range - 4.5–9.5 %, and the gas saturation in 50–65 %. According to the results of well testing – 19.0 thousand m3/d flow rate of gas was obtained in the interval 4042–4150 m of the well N10 (before intensification). Summarizing the obtained results and comparing with the world oil and gas practices in the field of unconventional sources of hydrocarbons one suggests that the rocks of the Moscow strata of Svyatogorska Area are tight gas reservoirs.
Bone items of the Neolithic site Baibek
Authors: Grechkina Tatiana Yu. , Malyutina Anna A. , Vybornov Aleksandr A. , Lebedev Yurii S.
Published: August 2020

The paper presents tools made from bones, antler and teeth from the Neolithic site Baibek, located in the semi-desert zone of the Northern Caspian Sea. The time of existence of the site dated back to the beginning of the first quarter of the VI mill. BC. Bone artifacts are of particular interest due to their discovery in a layer of sandy consistency. Bone artifacts were founded in the cultural layer of the site, in the pits, hearths and especially in the filling of the dwellings area. Special attention should be paid to the fact that different typological and functional tools can be considered as a single complex. Based on morphological, technological and functional features, the collection of artifacts was divided into 7 typological groups. The distribution of items by site area was indicated. Most of the preserved bone tools were discovered in the fill of the lower level of the dwelling, which is probably connected with better preservation of bone in the deep sediments than in the cultural layer, the upper part of which has been repeatedly previewing. Traceological analysis of the tools surface has determined the scope of their use this is treatment of skins and processing abrasives. Single examples represent fishing equipment, tools for processing stone items and antler haft. There are also decorative items made of bone and teeth pendants, piercing, and bones with ornaments.
Clinical effectiveness of intradetrusor injections of botulinum toxin type a in dose 100 units in multiple sclerosis patients with neurogenic detrusor overactivity
Authors: Filippova Еkaterina S. , Bazhenov Igor V. , Zyrjanov Aleksandr V. , Zhuravlev Vladimir N. , Borzunov Igor V. , Ustinov Gennadiy S.
Published: August 2020

Intravesical injections of botunulinum toxin type A (BTA) demonstrate good results in treatment of detrusor overactivity symptoms in patients with neurogenic low urinary tract dysfunction (NLUTD) when use in recommended doses of 200 and 300 Units. In clinical practice a government insurance dose not cover the price for the 200 BTA Units and only 100 Units may be injected in patients with neurogenic and nonneurogenic detrusor overactivity.
The aim was to evaluate the efficiency of intradetrusor injections of BTA in patients with NLUTD.
Materials and methods. The study included 28 MS patients with resistant to medical treatment neurogenic detrusor overactivity. All patients received intradetrusor injections of 100 BTA Units. The results were assessed after 1, 3 and 6 months after procedure.
Results. Clinical improvement had been achieved in all 28 patients. According to the urodynamic studies three months after BTA injections maximal cystometric capacity increased by 119.9 37.6% (p 0,05), volume at first detrusor involuntary contraction increased by 74.8 21.4% (p 0,05), maximal detrusor pressure at involuntary contraction decreased by 53.5 29.7% (p 0,05). The NBSS total score decreased from 38.04 14.27 to 29.06 14.46 (p = 0,000), mainly because of questions about incontinence and urgency. SF-Qualiveen total score turned from 2.32 0.70 to 1.61 0.85 (p = 0.000). Before procedure 2 patients performed intermittent catheterization, 4 patients catheterized after BTA injections.
Conclusion. Intradetrusor injection of 100 BTA Units in MS patients with NLUTD resulted in improvement of urodynamic parameters followed by reduction of clinical symptoms and life quality improvement for 6 months of observation. Using of BTA low dose didnt provide a total abortion of neurogenic detrusor overactivity symptoms but led to the starting of IC only in 2 patients.
Bladder neck stenosis surgery in interstitial cystitis / bladder pain syndrome treatment
Authors: Medvedev Vladimir L. , Mihailov Igor V. , Lepetunov Sergey N. , Medoev Yuriy N. , Kogan Mikhail I.
Published: August 2020

Introduction. Current methods of interstitial cystitis / bladder pain syndrome (IC/BPS) treatment dont allow to achieve long-term clinical remission.
Aim of the study was to investigate the clinical efficacy of bladder neck transurethral incision (TUI) in women with IC/BPS, who had bladder outlet obstruction signs.
Materials and methods. TUI was performed to patients with IC/BPS and proven bladder neck stenosis (n = 29). Assessment of the results of this operation was provided after 1, 3 and 6 months after surgical treatment. Treatment efficacy was evaluated by using Global Response Assessment (GRA) Scale, Pelvic Pain and Urgency / Frequency (PUF) Patient Symptom Scale, urination diaries, analysis of which allowed to determine functional bladder capacity, urinary frequency and nocturia. Pain assessment was made with 10-point Visual Analogue Pain Scale (VAS). Functional efficacy was evaluated with urodynamic examination, which included cystometric bladder capacity, maximal urinary flow rate and residual volume rate. Treatment results were compared with such in 39 patients with IC/BPS without signs of bladder neck stenosis.
Results. GRA score 2 had 96.5% and 72.4% in 1 and 3 months after bladder neck TUI, respectively. VAS, PUF Scale parameters, cystometric bladder capacity, maximal urinary flow rate, residual volume rate, urinary frequency and nocturia values also significantly improved after surgery.
Conclusions. This prospective clinical study is the first, in which IC/BPS course in women with bladder neck stenosis was investigated. It was noticed, that in 1 month after bladder TUI in 96.5% of patients decreased severity of IC/BPS symptoms, there were no urinary tract infection and local complications. In addition, this effect lasted for 3 months after surgery in 72.4% of patients and for 6 months in 68.9% of patients.
Diseño de experimento para detectar el nivel de probioticos en cereales infantiles en molinos y piladoras Peter S.A.S. con base en técnicas microbiológicas
Authors: Campo Salas Madeley  , Mesino Suarez Eliana , Pinedo Hernandez Leidy
Published: August 2020

En este artículo se plantea un diseño experimental 2k donde  se  evalúan  las  concentraciones  de  microorganismos  probióticos  en  los  cereales  infantiles  que  actualmente  se  comercializan en el mercado. Los ensayos se  llevaron a cabo  en  un  laboratorio  de  Biotecnología  donde  se  realizó  la  interacción de los siguientes factores: tipo de microorganismo, temperatura y tipo de siembra, los cuales fueron probados  en  una simulación en el tracto digestivo y metodología basada en  el tipo de siembra directa e indirecta en los medios de cultivos  específicos    con  un  recuento  de  unidades  formadoras  de  colonias  (UFC)  para  la  identificación  de  los  niveles  de  crecimiento del Bifidobacterium Lactis y Bacillus Coagulans.  En  esta  práctica,  se  demuestra  que  el  probiótico  “Bacillus  Coagulans”  es  de  fácil  detección  en  la  siembra  directa;  a  diferencia  del  “Bifidobacterium  Lactis”  que  no  tienen  un  crecimiento de bacterias acido láctica con ninguna de las dos siembras utilizadas, lo que significa que hubo resistencia para  la generación de unidades formadoras de colonias (UFC).  Cabe resaltar que los “Microorganismos Probióticos” en los  cereales infantiles deben estar presente en toda la vida útil del  producto y ser de fácil liberación. Es por esto, que los factores  que  mejor  intervienen  en  las  UFC  son  fijados  a  una  temperatura de 37ºC y basados en una metodología indirecta  para la obtención de recuentos de bacterias ácido láctico