bluuebunny/crossref_metadata_2025_split huggingface dataset:
Finitary birepresentations of finitary bicategories
Authors: Mackaay Marco , Mazorchuk Volodymyr , Miemietz Vanessa , Tubbenhauer Daniel , Zhang Xiaoting 
Published: August 2021

Abstract
In this paper, we discuss the generalization of finitary 2-representation theory of finitary 2-categories to finitary birepresentation theory of finitary bicategories.
In previous papers on the subject, the classification of simple transitive 2-representations of a given 2-category was reduced to that for certain subquotients.
These reduction results were all formulated as bijections between equivalence classes of 2-representations.
In this paper, we generalize them to biequivalences between certain 2-categories of birepresentations.
Furthermore, we prove an analog of the double centralizer theorem in finitary birepresentation theory.
Designing efficient randomized trials: power and sample size calculation when using semiparametric efficient estimators
Authors: Schuler Alejandro 
Published: August 2021

Abstract
Trials enroll a large number of subjects in order to attain power, making them expensive and time-consuming. Sample size calculations are often performed with the assumption of an unadjusted analysis, even if the trial analysis plan specifies a more efficient estimator (e.g. ANCOVA). This leads to conservative estimates of required sample sizes and an opportunity for savings. Here we show that a relatively simple formula can be used to estimate the power of any two-arm, single-timepoint trial analyzed with a semiparametric efficient estimator, regardless of the domain of the outcome or kind of treatment effect (e.g. odds ratio, mean difference). Since an efficient estimator attains the minimum possible asymptotic variance, this allows for the design of trials that are as small as possible while still attaining design power and control of type I error. The required sample size calculation is parsimonious and requires the analyst to provide only a small number of population parameters. We verify in simulation that the large-sample properties of trials designed this way attain their nominal values. Lastly, we demonstrate how to use this formula in the “design” (and subsequent reanalysis) of a real randomized trial and show that fewer subjects are required to attain the same design power when a semiparametric efficient estimator is accounted for at the design stage.
Si3N4/Graphene binary particles reinforced hybrid titanium composites and their characterization
Authors: Mutuk Tugba , Gürbüz Mevlüt 
Published: August 2021

Abstract
This study reports on silicon nitride (Si3N4) and graphene nanoplatelets binary powder reinforced hybrid titanium composites obtained by a powder metallurgy method. Si3N4 powder was added at 3 wt.% and graphene nanoplatelets were added in various amounts (0.15, 0.30, 0.45, 0.60 wt.%) in the titanium matrix. Density, micro-Vickers hardness, compressive behavior, wear properties and microstructure of the hybrid composites were evaluated. Addition of different percentages of graphene nanoplatelets and 3 wt.% Si3N4 to the titanium matrix composites significantly enhanced mechanical properties. The highest hardness (634 HV) and compressive strength (1458 MPa) values were measured for 0.15 wt.% graphene nanoplatelets and 3 wt.% Si3N4 added titanium hybrid composite. The lowest mass loss and wear rate (Δm = 4 mg, W = 6.1×10–5 mm3 (N m)–1) values were measured for the same 0.15 wt.% graphene nanoplatelets and 3 wt.% Si3N4 added titanium hybrid composite compared with pure Ti.
Effects of mixed time delays and D operators on fixed-time synchronization of discontinuous neutral-type neural networks
Authors: Sun Lin , Kong Fanchao , Qiu Hongjun , Zhang Yanhong 
Published: August 2021

Abstract
In this paper, the fixed-time synchronization analysis is addressed for a class of discontinuous neutral-type neural networks. The focus is mainly on the design of useful control laws such that the constructed error system converges to zero in a fixed time. The major difficulty is to cope with the discontinuous neuron activations, D operators, time-varying discrete, and distributed delays simultaneously. To accomplish the target, a new and effective framework is firstly established. By means of functional differential inclusions theory, inequality technique and Lyapunov–Krasovskii functional, novel discontinuous feedback controllers are designed and some new verifiable algebraic criteria are derived to design the control gains. In contrast to the existed results on the neutral-type neural networks, the theoretical results of this paper are more general and rigorous. Finally, numerical examples and simulations are presented to illustrate the correctness of the main results.
Supplementation of antihypertensive drug regimen with vitamin E ameliorates alterations of primary haemodynamic parameters and total antioxidant capacity in ovariectomised rats
Authors: Ajibade Temitayo Olabisi , Bolaji-Alabi Foluso B. , Oyagbemi Ademola Adetokunbo , Ajileye Ifeoluwa W. , Omobowale Temidayo Olutayo 
Published: August 2021

Abstract

Objectives
Ovariectomy induces heightened response to vasoconstrictors, alters vasorelaxation and consequently causes hypertension due to increased oxidative stress in rats.

Methods
This study evaluated the ameliorative effects of ramipril and vitamin E, on primary haemodynamic parameters and cardiac antioxidant defence status, in ovariectomised rats using 64 adult female rats of the Wistar strain randomly divided as follows: Control (sham); Ovariectomised (OVX); OVX plus Ramipril; OVX plus vitamin E; and OVX plus Ramipril plus vitamin E.

Results
The plasma level of oestrogen was significantly lower (p<0.05), in the ovariectomised rats compared with the sham. The systolic, diastolic and mean arterial blood pressure of ovariectomised rats increased significantly (p<0.05), but the alteration was significantly reduced by the administration of ramipril alone or in combination with vitamin E. Significant decrease (p<0.05) was observed in the serum level of nitric oxide in OVX group compared with Sham. Also, analysed markers of oxidative stress: Malondialdehyde (MDA) contents and hydrogen peroxide (H2O2) generated decreased significantly (p<0.05), but systemic antioxidants: reduced glutathione (GSH) contents; glutathione peroxidase (GPx) and superoxide dismutase (SOD) activities increased significantly (p<0.05) in the ovariectomised rats treated with ramipril and vitamin E compared with untreated ovariectomised rats. The study concludes that alteration, in the primary haemodynamic parameters, associated with ovariectomy in rats is potently ameliorated by co-administration of the antihypertensive drug ramipril and vitamin E.

Conclusions
The supplementation of antihypertensive regimen with antioxidants such as vitamin E in the treatment of hypertension is therefore justifiable especially in ovariectomised or hypogonadal patients.
On the confusion coefficient of Boolean functions
Authors: Zhou Yu , Hu Jianyong , Miao Xudong , Han Yu , Zhang Fuzhong 
Published: August 2021

Abstract
The notion of the confusion coefficient is a property that attempts to characterize confusion property of cryptographic algorithms against differential power analysis. In this article, we establish a relationship between the confusion coefficient and the autocorrelation function for any Boolean function and give a tight upper bound and a tight lower bound on the confusion coefficient for any (balanced) Boolean function. We also deduce some deep relationships between the sum-of-squares of the confusion coefficient and other cryptographic indicators (the sum-of-squares indicator, hamming weight, algebraic immunity and correlation immunity), respectively. Moreover, we obtain some trade-offs among the sum-of-squares of the confusion coefficient, the signal-to-noise ratio and the redefined transparency order for a Boolean function.
Simulative study of raised cosine impulse function with Hamming grating profile based Chirp Bragg grating fiber
Authors: Urooj Shabana , Alwadai Norah Muhammad , Ibrahim Anas , Rashed Ahmed Nabih Zaki 
Published: August 2021

Abstract
This work simulate the raised Cosine impulse function with Hamming grating profile based chirp Bragg grating fiber. The transmittivity/reflectivity, the grating ref index of the chirp grating fiber variations, real/imaginary coupling coefficient variations and the cross section monitor of the mesh transmission variations are simulated and clarified versus the length of grating. The transmission/reflection spectrum, input grating pulse width intensity spectrum, and the output grating pulse width intensity against the grating wavelength are demonstrated clearly. All the obtained results are demonstrated with the OptiGrating simulation software version 12. The transmittivity/reflectivity of chirp grating fiber, the grating ref index of chirp grating fiber, the cross section monitor of the mesh transmission and the real/imaginary coupling coefficient variations are simulated and demonstrated against the grating performance parameters.
Subject autonomy marking in Macro-Tani and the typology of middle voice
Authors: Post Mark W. , Modi Yankee 
Published: August 2021

Abstract
Middle voice constructions are generally understood as syntactically detransitivizing and as semantically characterized by a “low degree of event elaboration” (in Kemmer’s terms) involving a relatively affected subject. Middle voice constructions thus characterized have been identified in several Trans-Himalayan (Sino-Tibetan) languages, in particular by LaPolla. In Macro-Tani languages, we find a seemingly cognate construction with a similar distribution; however, Macro-Tani middle-like constructions are not detransitivizing, and do not mark subject affectedness. Instead, their primary meaning appears to be one of highlighting subject autonomy: a heightened degree of autonomy, volition and/or responsibility over an action on the part of the clause subject. In this article, following an analysis of Macro-Tani subject autonomy marking, we will argue that its similarities to and differences from middle voice marking in other Trans-Himalayan languages is consistent with Zúñiga and Kittilä’s view of middle voice as a “network of meanings,” whose properties derive not from their reflection of a unified underlying cognitive category, but rather from a heterogeneous set of developments from similar diachronic source forms.
Symmetric graphs of valency seven and their basic normal quotient graphs
Authors: Pan Jiangmin , Huang Junjie , Wang Chao 
Published: August 2021

Abstract
We characterize seven valent symmetric graphs of order

2
p

q

n

2p{q}^{n}

with

p
<
q

p\lt q

odd primes, extending a few previous results. Moreover, a consequence partially generalizes the result of Conder, Li and Potočnik [On the orders of arc-transitive graphs, J. Algebra 421 (2015), 167–186].
A global random walk on grid algorithm for second order elliptic equations
Authors: Sabelfeld Karl K. , Smirnov Dmitrii 
Published: August 2021

AbstractWe suggest in this paper a global random walk on grid (GRWG) method for solving second order elliptic equations. The equation may have constant or variable coefficients. The GRWS method calculates the solution in any desired family ofmprescribed points of the gird in contrast to the classical stochastic differential equation based Feynman–Kac formula, and the conventional random walk on spheres (RWS) algorithm as well. The method uses onlyNtrajectories instead ofmNtrajectories in the RWS algorithm and the Feynman–Kac formula. The idea is based on the symmetry property of the Green function and a double randomization approach.
Redetermination of the crystal structure of bis[N,N′-ethylenebis(acetylacetoniminato)nickel(II)] sodium perchlorate, C24H36ClN4NaNi2O8
Authors: Dey Lucky , Rabi Saswata , Begum Zinnat A. , Takase Tsugiko , Rahman Ismail M.M. , Tiekink Edward R.T. , Roy Tapashi Ghosh 
Published: August 2021

Abstract
C24H36ClN4NaNi2O8, monoclinic, C2/c (no. 15), a = 19.5909(11) Å, b = 10.8023(6) Å, c = 14.5722(8) Å, β = 112.032(1)°, V = 2858.7(3) Å3, Z = 4, R

gt
(F) = 0.0260, wR

ref
(F
2) = 0.0701, T = 93(2) K.
Navigating the Stay-at-Home Order with Benedictine Stability
Authors: Salim Emil 
Published: August 2021

Abstract
In this article, I argue that Benedictine stability might provide a rational modulation for some people to not only cope with but also flourish during the pandemic vis-à-vis the stay-at-home (SHO) order. I will not argue that those who obey the SHO are more rational than those who don’t or vice versa. Instead, I will argue that those who end up following the SHO, whether voluntarily or involuntarily, can rationalize following the SHO by learning from the Benedictine vow of stability. First, stability in a physical space reimagined as a kind of retreat from society might be beneficial for rejuvenating oneself and pursuing what one values. Second, stability negatively discourages people from escaping a difficult reality and positively encourages them to overcome challenges in the institutions in which they belong. Third, stability can be seen as a necessary context for the betterment of character.
Vildagliptin plasticized hydrogel film in the control of ocular inflammation after topical application: study of hydration and erosion behaviour
Authors: Nandi Souvik , Ojha Abinash , Nanda Ashirbad , Sahoo Rudra Narayan , Swain Rakesh , Pattnaik Krushna Prasad , Mallick Subrata 
Published: August 2021

Abstract
Vildagliptin (VID) is a dipeptidyl peptidase-4 (DPP-4) inhibitor used in controlling blood glucose level in type 2 diabetes. Vildagliptin improves beta cells function and is also suggested to effectively control the inflammation. The possible ocular anti-inflammatory property of vildagliptin has been explored using topically applied plasticized ocular film formulation. Film formulation was prepared by solvent cast and evaporation method using triethanolamine (TEA), dimethyl sulphoxide (DMSO), and polyethylene glycol 400 (PEG 400) as the plasticizer in HPMC hydrogel matrix base. Anti-inflammatory study was carried out in the carrageenan induced ocular rabbit model. Analytical methods confirmed that the drug was present almost in completely amorphized form in the film formulation. Level of hydration, swelling and erosion rate of the film played the controlling factor in the process of drug release, ocular residence and permeation. Maximum swelling rate of 363 h−1 has been shown by VHT compared to other formulation of VHD and VHP (174 and 242 h−1 respectively). Film containing DMSO exhibited highest in vitro release as well as ex vivo ocular permeation. Film formulation has shown a fast recovery of ocular inflammation in contrast to the untreated eye after inducing inflammation. Plasticized vildagliptin hydrogel film formulation could be utilized in the management and control of ocular inflammation particularly with diabetic retinopathy after proper clinical studies in higher animal and human individuals.
Friction and Wear Characterization of the Tribosystem Scraper versus Rubber in Conveyor Systems
Authors: Molnar W. , Pejaković V. , Nevosad A. , Varga M. , Adam K. , Deschka S. , Badisch E. 
Published: August 2021

Abstract
Rubber conveyor belts are an important part of the transport chain in many industries, ranging from food processing to steel mills. In this context, it is important to employ scrapers, which remove adhering goods from the belts and reduce loss of these resources during transport. The tribological contact between belt and scraper is of high importance as this often is a source of wear and unintended energy consumption. In this work, the interaction between scrapers and belt was investigated by utilizing a pin-on-disk setup with and without abrasive intermedia. A strong dependence of friction and wear on the alignment angle between pin and belt was proven by the investigations. An orthogonal setup caused the highest coefficient of friction, but the lowest wear, while an increasing deviation from the 90° alignment, resulted in an inverse trend. Also, the geometrical shape and size of the abrasive determined wear, as larger, sharper particles enhanced wear. Abrasive particles likewise influence the tribological contact between pin and belt by reducing the friction compared with the 2-body contact.
ÚLTIMA ETAPA FIGURATIVA DE MANUEL DE LA CRUZ GONZÁLEZ: “DESNUDO ROJO” (1978)
Authors: Montero Rodríguez Daniel Adolfo 
Published: August 2021

Recibido: 08-03-2020
Aprobado: 29-05-2020

RESUMEN

Este artículo consiste en un estudio semiótico, sobre el proceso de inicialización de la neofiguración en la pintura costarricense de la década de los años setenta (siglo XX), específicamente la nueva figuración del artista Manuel de la Cruz González, determinada por su obra Desnudo rojo (1978). Metodológicamente, se recurre a un análisis semiótico, por medio de un proceso de interpretación del signo en tres niveles (sintáctico, semántico y pragmático). Asimismo, como acercamiento teórico, se conceptualiza la noción de "arte neofigurativo”. También, se hace referencia al contexto socio-histórico costarricense de los Salones Nacionales de Artes Plásticas (1972). De esta manera, se consigue percibir cómo el impulso al arte costarricense, fomentó la producción artística que aunado al contexto costarricense y latinoamericano que presenta un cambio de paradigma social -crisis de valores-, a través de la aparición de la globalización y el neoliberalismo, tuvo una influencia patente en el proceso de inicialización de la neofiguración costarricense, sobre todo en Desnudo rojo (1978) de este pintor costarricense.
RENDIDOS ANTE LA GUARIA MORADA
Authors: Orozco Abarca Sergio 
Published: August 2021

Recibido: 14-10-2019
Aprobado: 29-11-2019
RESUMEN
El presente artículo comprende un estudio sobre la guaria morada, símbolo nacional de Costa Rica. Para ello se realiza un acercamiento histórico a las orquídeas, desde el momento de su bautizo hacia el siglo IV A.C., hasta que surge la fiebre por ellas en Europa en el siglo XVIII, seguida por el hallazgo de la guaria morada en las selvas de Guatemala, y culminando con la presencia de la planta en Costa Rica. También se hace un recorrido sobre su nombre, y se rescatan unas fascinantes crónicas de guarias. Ello con el fin de horrar este ícono que resguarda en la memoria como parte constitutivadel ser costarricense.
A CINCUENTA AÑOS DE LA CREACIÓN DEL MINISTERIO DE CULTURA EN COSTA RICA. LA INVERSIÓN E INTERVENCIÓN ESTATAL EN EL ÁMBITO CULTURAL
Authors: Siles Yanina Ruiz 
Published: August 2021

Recibido: 21-05-2020
Aprobado: 24-07-2020
El desarrollo de la institucionalidad cultural costarricense data del siglo XIX, pero a partir de la creación del MCJD se dio una centralización en la inversión e intervención estatal en este ámbito. Permitiendo así, que el sector cultural se expandiera durante la década de 1970 y 1980. Sin embargo, la adopción del modelo neoliberal tuvo un impacto negativo en este crecimiento, el cual se ve plasmado entre los años 1990 y 2020. El presente trabajo tiene como objetivo analizar estos procesos en Costa Rica, para ello se revisaron las memorias institucionales y las leyes de presupuesto del Ministerio de 1971 al 2020. En el artículo se observan las continuidades y transformaciones de esta entidad.
REENCUENTRO CON EL TRUEQUE Y LOS SABORES FAMILIARES EN EL ÁMBITO COMUNITARIO DE COSTA RICA, EN MEDIO DE LA PANDEMIA COVID-19
Authors: Sedó Masís Patricia 
Published: August 2021

Recibido: 30-07-2020
Aprobado: 05-08-2020
Se describen aspectos socioculturales, de producción, sociales familiares y comunitarios asociados con la alimentación en el contexto de la pandemia de COVID-19, a partir de una revisión documental y 20 entrevistas semiestructuradas realizadas entre abril y julio del 2020 a líderes comunitarios y productores de diversas partes de Costa Rica (11 mujeres y 9 varones con un promedio de edad de 47,5 años). El distanciamiento físico, mayor permanencia en casa, pérdida del poder adquisitivo familiar, cambios en las dinámicas laborales, asociación colaborativa de productores locales, ayuda humanitaria e incremento de iniciativas productivas y emprendimientos familiares para generar entradas económicas, y sobrevivir en medio de la pandemia, son altamente relevantes en el contexto actual de inseguridad alimentaria y nutricional. Se evidencia la necesidad de retomar la cocina como un espacio de encuentro familiar, y el seguimiento de recetas familiares. Se presenta la revalorización de los alimentos producidos nacionalmente e interés por su trazabilidad, así como prácticas de recolección de alimentos subutilizados y la producción para autoconsumo. Resalta también la toma de medidas para evitar la pérdida y el desperdicio de alimentos en un contexto de crisis económica y ahorro familiar.
LA ICONOLOGÍA DE LA PINTURA DE LA JERUSALÉN CELESTE AGUSTINA EN EL SANTUARIO DE CHALMA, MÉXICO
Authors: Ledezma Ibarra Carlos Alfonso 
Published: August 2021

En el Santuario del Santo Señor de Chalma se venera una escultura de un Crucifijo proveniente desde el siglo XVI, y que de acuerdo con las crónicas agustinas fue uno de los elementos más importantes para lograr la evangelización de dicha región. La devoción alrededor del Cristo Crucificado de Chalma creció durante el siglo XVII lo que impulsó la construcción de un convento y un santuario.
El 6 de septiembre 1783, el rey Carlos III expidió una cédula que le confirió al recinto el título de “Real Convento y Santuario de Nuestro Señor Jesucristo y San Miguel de las cuevas de Chalma”. Unos años más tarde durante la primera década del siglo XIX fue decorada su sacristía con cinco extraordinarios lienzos que, afortunadamente, se han conservado en su sitio original. Este escrito procura una interpretación iconográfica de estas imágenes, entre las que destaca la representación de una Jerusalén Celeste con San Agustín al centro de su composición.
LA NUEVA FIGURACIÓN EN LA OBRA DE RAFAEL ÁNGEL FELO GARCÍA CON “TUGURIOS” (1970)
Authors: Montero Rodríguez Daniel 
Published: August 2021

Recibido: 18-01-2021.
Aprobado: 01-05-2021.
Este artículo es un estudio semiótico sobre el comienzo de la nueva figuración en la pintura costarricense para la década de los años setenta; concretamente, en el trabajo del artista Rafael Ángel Felo García Picado con su obra Tugurios (1970). También, se hace referencia al contexto socio-histórico costarricense de los Salones Nacionales de Artes Plásticas (1972). Metodológicamente, se emplea un análisis semiótico, a través del proceso de interpretación del signo en tres niveles (sintáctico, semántico y pragmático). Asimismo, como acercamiento teórico, se conceptualiza la noción de "arte neofigurativo”. Finalmente, se logra percibir cómo el fomento de la producción artística costarricense, que aunado a su contexto, presenta un cambio de paradigma social -crisis de valores-, debido a la aparición de la globalización y el neoliberalismo. Esto fue una influencia patente en el impulso al arte costarricense y el proceso de inicialización de la neofiguración costarricense, sobre todo en Tugurios (1970) de este pintor costarricense.