bluuebunny/crossref_metadata_2025 huggingface dataset:
Natural wetlands in protected areas as a key to water quality resilience
Authors: Benegas Gabriela Sosa , Imas-Garay Lourdes , Netto Flavia , Lombardo Laura , Vergara Angela , Martínez Karen , Céspedes Rosa , Vera Giselle , Mendez-Gaona Sergio , Sosa Paola Inchausti , Gossen Ana Carolina , Bareiro Gustavo
Published: March 2023

Wetlands are buffers for terrestrial runoff with the essential service of water purification. Despite its importance, they are experiencing degradation due to the combined effect of climate change and poor land-use practices. Studies of natural wetlands in Paraguay are scarce. We assessed wetland water quality conditions using pH, turbidity, total phosphorus (TP), and bacterial indicators of 12 natural wetlands located in protected areas (PW) or in the border of agricultural lands (AW) in the Paraguayan side of the watershed of Parana River. AW presented acidic pH values (x̄=5.5). We registered higher TP values in AW (x̄=0.14 mg/L) compared to PW (x̄=0.06 mg/L). For turbidity AW presented higher and variable values (x̄=425 NTU) than PW (x̄=34 NTU). In connected wetlands as the nutrient flows through the wetlands system to the reservoir concentration decreased 70% (0.1 to 0.03 mg/L) and the turbidity decreased from 112 to 42,6 NTU. This study observed a high degree of variability of bacterial indicators in water and sediment. The counts of coliforms in water and sediment samples were in the order E.Coli>Total coliforms>Fecal Coliforms. Long term contamination by organophosphorus and carbamate pesticides was pointed by the positive results in 100% of the sediment samples. As far as we can conclude wetlands has a key function in ecosystem function, health and preserving the water quality that enters to the reservoir, and protected PW presented better water quality conditions in terms of TP, turbidity, and bacterial indicators.
Posterior Inference of Differential Expression (DE) State and Evolutionary Distance
Authors: Gu Xun
Published: March 2023

To address how gene regulation plays a key role in phenotypic innovations through high throughput transcriptomes, it is desirable to develop statistically-sound methods that enable researchers to study the pattern of transcriptome evolution. On the other hand, statistical detection of differentially expressed (DE) genes between two samples is probably the most common practice in the transcriptome analysis. In this paper, the author developed a new evolutionary approach, based on the genome-wide p-value profile arising from statistical testing of DE genes between species. First, the widely-used BUM (beta-uniform mixture) model for the genome-wide p-value distribution was invoked to calculate the posterior probability of a gene being DE denoted by Q = P(DE|p). Then the author develop a simple method to estimate the transcriptome distance for any number (m) of orthologous genes based on their Q-values. Computer simulations showed the statistical performance of these new methods are generally satisfactory.
A weightless factor two-stage model predictive control strategy
Authors: Wang Guifeng , Li Peiru , Wang Yu
Published: March 2023

In this paper, a weightless factor two-stage finite set model predictive control (FCS-MPC) strategy is proposed to drive asynchronous motors with three-level Neutral Point Clamped Voltage Source Inverter (3L-NPC-VSI) as the research object, in order to achieve weightless factor control and reduce torque ripple. Firstly, in view of the difficulty of weight factor setting in traditional FCS-MPC applications, the layered optimization method is adopted to stratify the three performance indicators of voltage trip, common-mode voltage and current follow-up, so as to avoid the weight factor setting link and reduce the amount of prediction operation. Secondly, in order to further reduce the torque ripple, in the current control layer to the current following error as the principle of the least, the role of an optimal vector or optimal vector combination, and in the optimal vector combination selection process, the first vector of the combination is selected as the vector at the end of the current cycle, so as to ensure that there is only one switching state switch in each control cycle, reducing the switching loss of the two-stage FCS-MPC. Finally, simulation and experimental results verify the feasibility and effectiveness of the proposed strategy.
Regulation of Platform Price Discrimination on Either or Both Sides of the Market
Authors: Lestage Romain , Kim Soo Jin
Published: March 2023

We analyze the welfare effects of price discrimination by a monopolistic platform that mediates between two sides of a market. Discrimination is based on asymmetric costs on one side of the market and may be allowed on either side or both sides. We show that unconstrained discrimination on both sides of the market improves welfare compared to uniform pricing but may be dominated by single-side discrimination. This result is driven by matching effects found between the sides, which add to the standard reallocation effects found within the sides.
JEL Classification Numbers: D4, L1
Intervention analysis for integer-valued autoregressive models
Authors: Pedeli Xanthi , Fried Roland
Published: March 2023

We study the problem of intervention effects generating various types of outliers in an integer-valued autoregressive model with Poisson innovations. We concentrate on outliers which enter the dynamics and can be seen as effects of extraordinary events. Weconsider three different scenarios, namely the detection of an intervention effect of a known type at a known time, the detection of an intervention effect of unknown type at a known time andthe detection of an intervention effect when both the type and the time are unknown. We develop \(F\) -tests and score tests for the first scenario. For the second and third scenarios we rely on the maximum of the different $F$-type or score statistics. The usefulness of the proposed approach is illustrated using monthly data on human brucellosis infections in Greece.
Mass transfer kinetics and mechanisms of polyethylene degradation mediated by bacterial-fungal consortium
Authors: Fachrul Melati Ferianita , Fulazzaky Mohamad Ali , Rinanti Astri , Muda Khalida , Tazkiaturrizki Tazkiaturrizki , Sunaryo Thalia
Published: March 2023

Understanding the degradation rate of polyethylene (PE) plastic mediated by bacterial-fungal consortium (BFC) is important to ensure an effective design process of bioremediation technology. This study aims to investigate the degradation behavior of PE plastic waste mediated by the BFC colonies using the modified mass transfer factor models to get better understanding on the kinetics and mechanisms of internal, external and global mass transfer. The performance of rectangular reactor (RR) to degrade PE plastic reaching 61.5% of the efficiency shows an increased efficiency of 55.9% stimulated by the presence of BFC strains in the breakdown of complex PE molecules during the process of bioremediation. Trend in the variation of [kLa]d value viewed almost the same with that of [kLa]g value is higher than that of [kLa]f value during 150 days of the experiment hence the rate-limiting step of PE plastic waste degraded depends on the resistance of external mass transfer. Analysis of degradation efficiency pursuant to both the factors of internal and external mass transfer during the 150-day experimental period provides a new insight on the role of BFC strains to increase the performance of RR process contributing to advance the future bioremediation process of PE plastic waste.
A Novel Embedding Model for Knowledge Graph Entity Alignment Based on Graph Neural Networks
Authors: Li Hongchan , Han Zhaoyang , Zhu HaoDong , Qian Yuchao
Published: March 2023

The objective of the Entity Alignment (EA) task is to identify entities with identical semantics across distinct Knowledge Graphs (KGs) situated in the real world, which has garnered extensive recognition in both academic and industrial circles. Within this paper, a pioneering entity alignment framework named PCE-HGTRA is proposed. This framework integrates the relation and property information from varying KGs, along with the heterogeneity information present within the KGs. Firstly, by learning embeddings, this framework captures the similarity that exists between entities present across diverse KGs. Additionally, property triplets in KGs are used to generate property character-level embeddings, facilitating the transfer of entity embeddings from two distinct KGs onto an identical space. Secondly, the framework strengthens property character-level embeddings using the transitivity rule to increase the count of entity properties. Then, in order to effectively capture the heterogeneous features in entity neighborhoods, a heterogeneous graph transformer with relation awareness is designed to model the heterogeneous relations in KGs in the framework. Finally, comparative experimental results on four widely recognized real-world datasets demonstrate that PCE-HGTRA performs exceptionally well. In fact, its Hits@1 performance exceeds the best baseline by 7.94%, outperforming seven other state-of-the-art methods.
Feeding with 4,4′-diaponeurosporene-producing Bacillus subtilis enhances the lactogenic immunity of sow
Authors: Liu Peng , Zhang Qi , Yang Chengjie , Wang Xiuyu , Li Yuchen , Li Jianda , Yang Qian
Published: March 2023

The delivery of specific antibodies produced by oral administration of the porcine epidemic diarrhea virus (PEDV) vaccine by sow to newborn piglets via colostrum is an effective strategy to prevent porcine epidemic diarrhea (PED). However, there is a lag in the development of the corresponding vaccine due to the rapid mutation rate of PEDV, which could significantly increase the difficulty of PED prevention and control in pig farms. Hence, congenital lactogenic immunity was assessed by feeding 4,4′-diaponeurosporene-producing Bacillus subtilis (B.S-Dia) to sow on the 80th day of gestation in order to protect newborn piglets from PEDV infection. Firstly, we found that the quantities of T lymphocytes and monocytes in the blood and colostrum of sow after oral administration of B.S-Dia were significantly increased as observed by flow cytometry, whereas the proliferative activity of T lymphocytes in colostrum was also markedly increased. Furthermore, enzyme-linked immunosorbent assay (ELISA) results revealed that levels of TGF (Transforming growth factor) -β, Interleukin (IL) -6, lysozyme and lactoferrin were significantly increased. Finally, it was found in the piglets’ challenge protection test that offspring pigs of which sow was exposed to oral administration of B.S-Dia during pregnancy did not develop diarrhea symptoms and intestinal pathological changes 48 h after infection with PEDV, and the load of PEDV in the jejunum and ileum was significantly reduced, but offspring pigs of which was exposed to oral administration of PBS during pregnancy developed pronounced diarrhea symptoms and extensive PEDV colonization was noted both in the jejunum and ileum. In summary, oral administration of B.S-Dia by sow substantially increased congenital lactogenic immunity, thereby preventing newborn piglets from being infected with PEDV.
Causal effect of lipoprotein-associated phospholipase A2 activity on ischemic stroke : a Mendelian randomization study
Authors: Zhang Yang , Li Ming , Jiang Miaowen , Gao Yuan , Xu Yi , Zhou Yifan , Wu Di , Zhou Chen , Liu Guiyou , Ji Xunming
Published: March 2023

Background

The causality between lipoprotein-associated phospholipase A2 (Lp-PLA2) activity and ischemic stroke remains uncertain and the stratified research on the association between Lp-PLA2 activity and subtypesof ischemic stroke is still lacking. Therefore, the association of genetically proxied Lp-PLA2 activity with the risks of ischemic stroke and its subtypes was explored by Mendelian randomization in this study.

Methods

Five single-nucleotide polymorphisms associated with Lp-PLA2 activity were selected as instrumental variables based on the data from CHARGE Consortium with 13,664 European participants. Summary statistics data about MEGESTROKE consortium with the European group (40,585 cases and 406,111 controls) include any ischemic stroke (AIS) (n = 34,217); large-artery stroke (LAS, n=4,373), cardioembolic stroke (CES, n=7,193) and small vessel stroke (SVS, n=5,386). The inverse variance weighted (IVW) method was used as the main analysis to assess the causal associations of Lp-PLA2 activity with ischemic stroke and its subtypes, and significant estimates were further tested by sensitivity analysis to exclude heterogeneity and pleiotropy.

Results

IVW showed genetically proxied Lp-PLA2 activity was causally associated with LAS (OR=3.25, 95% CI=1.65-6.41, p=0.0007), but not causally associated with AIS (OR=1.32, 95% CI=0.81-2.15, p=0.25), CES (OR=1.18, 95% CI=0.62-2.23, p=0.61) or SVS (OR=1.31, 95% CI=0.73-2.37, p=0.37). Sensitivity analysis for causal estimates between Lp-PLA2 activity and LAS showed no significant heterogeneity or pleiotropy.

Conclusions

These MR analyses support a causal role of Lp-PLA2 activity in LAS but not in AIS, CES or SVS, which suggests that serum Lp-PLA2 activity might be a biomarker for prediction of LAS.
Evaluating Normative Values of Vergence Parameters among University Students in Malawi
Authors: Mvula Augustine , Mzumara Thokozani , Afonne Joseph
Published: March 2023

Clinical relevance: Diagnosis and management of vergence dysfunctions are largely dependent on normative measures of vergence parameters which differ across populations.
Background: Globally Myopia is on the rise and vergence has been strongly linked to the development of Myopia. Understanding vergence parameters is key to mitigation of Myopia.
Aim: This study aimed at evaluating differences in vergence parameters among university students in Malawi.
Methods: This cross-sectional quantitative study was conducted among Mzuzu University students from September 2021 to March 2022. A total of 99 healthy participants comprising 62 males (62.6%) and 32 females (37.4%) were recruited using a stratified random sampling technique. AC/A ratio was measured using the gradient method, and Positive Fusion Vergence (PFV) and Negative Fusion Vergence (NFV) using horizontal prism bars recorded as blur, break, and recovery points.
Results: The mean age was 23.37 ± 3.95 years (range; 18-33). The mean AC/A ratio was 4.24 ±0.74, the mean PFV was 17/24/15 and the mean NFV was 17/20/14. There was no significant correlation between the AC/A ratio and age (p = 0.194) nor was there a significant association between AC/A and sex (p = 0.170). Both PFV and NFV had no statistically significant correlation with age (all p ≥ 0.306) or association with sex (all p ≥ 0.253).
Conclusion This study confirms that the pattern of vergence parameters differs with ethnicity. Furthermore, ACA ratio and fusion vergences are most not affected by age and sex.
Non-coplanar magnetism, topological density wave order and emergent symmetry at half-integer filling of moiré Chern bands
Authors: Wilhelm Patrick , Lang Thomas , Scheurer Mathias , Läuchli Andreas
Published: March 2023

Twisted double- and mono-bilayer graphene are graphene-based moiré
materials hosting strongly correlated fermions in a gate-tunable
conduction band with a topologically non-trivial character. Using
unbiased exact diagonalization complemented by unrestricted Hartree-Fock
calculations, we find that the strong electron-electron interactions
lead to a non-coplanar magnetic state, which has the same symmetries as
the tetrahedral antiferromagnet on the triangular lattice and can be
thought of as a skyrmion lattice commensurate with the moiré scale,
competing with a set of ferromagnetic, topological charge density waves
featuring an approximate emergent O(3) symmetry, “rotating” the
different charge density wave states into each other. Direct comparison
with exact diagonalization reveals that the ordered phases are
accurately described within the unrestricted Hartree-Fock approximation.
Exhibiting a finite charge gap and Chern number
|C|=1,
the formation of charge density wave order which is intimately connected
to a skyrmion lattice phase is consistent with recent experiments on
these systems.
Designing observables for quantum interference in jets at subleading color
Authors: Larkoski Andrew J.
Published: March 2023

The large-Nc
or topologically planar limit of gauge theories can be considered as a
classical limit because all gauge bosons are distinguishable particles
and therefore cannot exhibit interference. Quantum effects due to the
flow of color therefore arise starting at subleading in
1/Nc.
We introduce kinematic observables explicitly sensitive to effects at
subleading color formed from the ratio of interfering to squared
color-ordered amplitudes. Such observables are in general not infrared
and collinear safe, so we introduce angular observables defined from
appropriate multi-point energy correlators motivated by the form of
color-ordered amplitudes. We demonstrate that color interference effects
are manifest as sinusoidal oscillation in the simplest system, a
collinear jet with three particles, and show the limitations of
predicting this observable in all-purpose, leading-color parton shower
Monte Carlos.
Correlations and linewidth of the atomic beam continuous superradiant laser
Authors: Laburthe-Tolra Bruno , Amodjee Ziyad , Pasquiou Benjamin , Robert-de-Saint-Vincent Martin
Published: March 2023

We propose a minimalistic model to account for the main properties of
a continuous superradiant laser, in which a beam of atoms crosses the
mode of a high-finesse Fabry-Perot cavity, and collectively emits light
into the cavity mode. We focus on the case of weak single atom - cavity
cooperativity, and highlight the relevant regime where decoherence due
to the finite transit time dominates over spontaneous emission. We
propose an original approach where the dynamics of atoms entering and
leaving the cavity is described by a Hamiltonian process. This allows
deriving the main dynamical equations for the superradiant laser,
without the need for a stochastic approach. We derive analytical
conditions for a sustained emission and show that the ultimate linewidth
is set by the fundamental quantum fluctuations of the collective atomic
dipole. We calculate steady-state values of the two-body correlators and
show that the continuous superradiant regime is tied to the growth of
atom-atom correlations, although these correlations only have a small
impact on the laser linewidth.
A cross-country study of the direct and inverse relationship between economic globalization and growth
Authors: Khoroshun Oleksiy , Olasiuk Hanna , Rokocha Vira , Kumar Sanjeev
Published: March 2023

This study aims to explore the cross-country relationship between economic globalization and growth. It assesses the implications of globalization for the world economy and groups of countries with different income levels. The study employed panel data from the World Bank, the Fraser Institute, and the Swiss Federal Institute of Technology in Zürich for 122 countries from 1970 to 2018. Two-stage fixed effect model was used to assess the impact of globalization on growth. The reverse causality was estimated using the method of instrumental variables. The results showed that the world economy benefited from globalization. In turn, greater openness has reinforced economic growth. The study confirms that globalization benefits are distributed unequally. A significant positive impact of globalization on economic growth is confirmed for high and lower-middle-income economies with coefficients of 0.02 and 0.01, respectively. Economic growth of high-income countries is determined by financial globalization, while lower-middle-income countries rely on trade and financial openness. Negative implications of economic globalization took place in upper-middle-income countries with a coefficient of -0.02. In these countries, correlation between trade globalization and growth is -0.13. The effect of economic growth on globalization is found to be significantly positive for high-income (11.08) and upper-middle-income countries (9.62) and statistically insignificant for lower-middle-income economies.
Macular thickness in patients with refractive errors
Authors: Shpak A. A. , Morina N. A. , Korobkova M. V.
Published: March 2023

Purpose. To investigate the influence of the axial length of eyes on the average macular thickness and to develop a method for assessing this optical coherence tomography (OCT) parameter in patients with refractive errors. Material and methods. The study involved 132 patients (132 eyes) over 40; of these, 43 patients with hyperopia (axial length 20–22 mm), 38 patients with myopia (axial length 25–28 mm) and 51 healthy subjects with emmetropia with similar gender and age distribution (axial length 22.5–24.5 mm). OCT was performed on a Cirrus HD-OCT device (Carl Zeiss Meditec, USA). Results. The average macular thickness in the emmetropia group was 282.4 ± 10.2 (261–304) μm. In patients with myopia, it was on average 7 μm less (274.9 ± 10.5; from 250 to 296 μm, p = 0.005), and in patients with hyperopia it was almost 6 μm thicker (288.2 ± 12.5; from 258 to 313 μm, p = 0.032). In the emmetropia group, normative data for the average macular thickness were determined. For eyes with the axial length of 20–22 and 25–28 mm, corrections for calculating the average macular thickness in emmetropic eyes have been developed, allowing comparison with the normative data. Conclusion. The average macular thickness decreases with the increase of the axial length of the eye. An original technique for assessing the average macular thickness in patients with refractive errors, adapted to the Cirrus HD-OCT device, was developed. For this device, the normative database of healthy subjects with emmetropia aged of 41–80 years has been compiled.
The impact of scheduled hemodialysis on clinical-functional and morphometric ophthalmological status of patients with a terminal kidney disease
Authors: Kozina E. V. , Balashova P. M. , Sinyapko S. F. , Gololobov V. T. , Ivliev S. V.
Published: March 2023

The literature review discusses the impact of scheduled hemodialysis on the state of the anterior part of the eye, the chorioretinal complex, the central and peripheral vision. The hemodialysis procedure is accompanied by a decrease in basal tear production, quickening of the tear film break-up, and an abnormal ocular surface disease index. Thinning of the corneal center is not accompanied by significant keratometric changes. Intradialytic thinning of the choroid and reduction of ocular perfusion pressure may be involved in the progression of ischemic eye diseases. Lower visual acuity is associated with the instability of the lens and choroid thickness. The impact of hemodialysis on the peripheral vision has not been sufficiently investigated. The correlations of ophthalmic changes with systemic effects of the dialysis are ambiguous. The inconsistency of the research results requires that the research should be continued.
The role of parental compliance in the ophthalmological rehabilitation of patients in the active phase of retinopathy of prematurity
Authors: Gndoyan I. A. , Adelshina N. A. , Petrayevsky A. V. , Kovilin V. V.
Published: March 2023

Purpose: to assess the degree of parents’ compliance of children with retinopathy of prematurity (ROP) in the active phase of the disease and to identify the factors affecting the formation of the compliance. Material and methods. 73 parents (67 mothers and 6 fathers) of active phase ROP-patients were surveyed using a replenishable database created in Google Forms The respondents’ age ranged from 22 to 46 years (averagely, 32.5 ± 2.0 years). The questionnaire involved socio-demographic characteristics (the parents’ age and gender, place of residence, education; gestational age of the child at the time of birth, the child’ age at the moment of the parental survey) and the data on the communication with medical personnel and adherence to their recommendations. The survey had multiple choice and open-type questions. The criteria for compliance included exact adherence to the recommendations of the attending physician and the approval of their actions concerning the main treatment features (using of medications, resorting to surgery, i.e. laser coagulation of the retina, dynamic multi-stage ophthalmological observation). Results. 90.4 % of the respondents received basic information about the eye disease of their child from an ophthalmologist. 15.1 % of respondents mentioned additional printed sources, and 20.5 %, the Internet resources. High levels of satisfaction concerned the completeness of the information received from the doctor (76.7 %) and the appointment of diagnostic examinations and laser coagulation of the retina (100 %). The highest compliance rates were found in parents over 36 yrs. and in the parents of patients with severe posterior aggressive ROP. The level of education, place of residence, the degree of prematurity of the child had no significant impact on the assessment of the competence of the ophthalmologist. Conclusion. ROP has specific clinical and psychological features that require high professionalism, and communication skills of neonatologists and ophthalmologists. It is expedient that a clinical psychologist participates in the treatment process so as to ensure timely correction of compliance disorders of the parents of a premature infant.
A comparative analysis of the results of corneal astigmatism correction by toric IOL using various markup methods
Authors: Ioshin I. E. , Murashev A. O. , Demin A. N.
Published: March 2023

Purpose: to analyze the results of corneal astigmatism correction by cataract surgery using two methods of marking the calculated toric IOL axis with Alpins vector analysis. Materials and methods. The retrospective study group included 212 patients (259 eyes) with cataracts and baseline corneal astigmatism from 0.75 to 8.25 D. The patients were implanted with two varieties of toric IOLs: Alcon Acrysof Toric (113 patients, 135 eyes) and Zeiss AT Torbi 709M (99 patients, 124 eyes). IOL parameters were calculated using an IOLMaster 500 (Carl Zeiss) optical biometer, the target refraction being emmetropy. The axis of toric IOL alignment was determined by online calculators provided by the producers. The patients were divided into two groups in accordance with the marking method: group 1 patients (149 eyes) were marked using by the authors’ techniques that used the angular scale of the slit lamp, while group 2 (110 eyes) was treated with Verion (Alcon) and Callisto Eye (Zeiss) navigation systems. The effectiveness of astigmatism correction was assessed using the Alpins vector analysis method. Results. After surgery, both groups showed a significant increase in uncorrected (UCVA) and best corrected visual acuity (BCVA). In group 1, one month after the operation, the UCVA was 0.67 ± 0.19, and the BCVA was 0.80 ± 0.17. In group 2, UCVA was 0.69 ± 0,07, and BCVA was 0.80 ± 0.49. The success index (IOS) was 0.14 in group 1 and 0.11 in group 2. The difference vector (DV) in the two groups was 0.37 and 0.31 D, respectively, suggesting highly precise astigmatism correction. The average error angle (AOfE) in group 1 was 3.29°, and in group 2 — 3.29°. The average value of the TIA vector was 2.69 ± 1.01 D along the axis of 87.3°, in group 1, while that of group 2 was 2.75 ± 1.09 D along the axis of 95.1°. The average values of the SIA vector were 2.32 ± 0.99 D along the axis of 870 in group 1 and — 2.44 ± 1.03 D along the axis of 99.6° in group 2. Conclusion. The authors’ markup method using the angular scale of the slit lamp yields high functional results of corneal astigmatism correction. The comparative vector analysis of the two study groups shows similar results in applying the authors’ type of markup and that of intraoperative navigation systems.
La Realidad Virtual para la enseñanza y aprendizaje de la perspectiva en el dibujo
Authors: González Pérez Patricia , Mesías Lema José María
Published: March 2023

Este artículo es el resultado de una investigación con 109 alumnos de primero de Bachillerato de Artes. Se han empleado dispositivos digitales de Realidad Virtual para el aprendizaje de las artes en la era de la educación postdigital. El objetivo principal es la mejora de la enseñanza y aprendizaje de la perspectiva en el dibujo. La Realidad Virtual (RV) es un dispositivo emergente en el aula, aunque su irrupción en la industria del videojuego o en el ámbito cultural y deportivo, se ha producido hace años. El propósito de esta investigación es indagar en las posibilidades educativas de la realidad virtual mediante el diseño y la aplicación de software 3D, acercando la visión de la perspectiva cónica a través de un aprendizaje inmersivo, contextualizado y vinculado a las situaciones reales de la vida cotidiana del alumnado. La metodología de investigación-acción empleada, se basa en el diseño de entornos virtuales para entender la perspectiva a través de la percepción visual. Los resultados de esta investigación dejan constancia de cómo los dispositivos digitales han propiciado una transformación metodológica para la comprensión de la perspectiva cónica, y su aplicación a proyectos reales a partir de la interacción del alumnado con la tecnología digital.
Estrategias didácticas de la educación virtual universitaria: Revisión sistemática
Authors: Rivera Tejada Helen Soledad , Otiniano García Nélida Milly , Goicochea Ríos Evelyn del Socorro
Published: March 2023

La educación virtual, implica el uso de estrategias didácticas adecuadas para lograr una enseñanza de calidad. Se realizó una revisión sistemática con el objetivo de identificar las estrategias en la educación virtual universitaria. Las búsquedas se realizaron en las bases de datos Scielo, Redalyc, ERIC y Google Scholar. Los descriptores fueron: “Educación virtual”, “comunicación” “perspectivas”, “estrategias. Se incluyeron artículos de acceso libre, de texto completo, artículos de los últimos 7 años, en idiomas inglés, español y portugués. Se excluyeron los resúmenes, los artículos duplicados y aquellos que no tenían información relevante sobre las variables en estudio.  Después del proceso de selección, quedaron 14 artículos. En cuanto a las estrategias didácticas para la educación virtual destacan la planeación y control, la motivación, la comunicación, la confianza, la empatía, innovación, el diseño, formas de evaluación, trabajo colaborativo, metodología constructivista, y estrategias de autorregulación. Se resalta la importancia del conocimiento del idioma inglés y de las TIC. Se concluye que las estrategias didácticas utilizadas en educación virtual universitaria son de gran utilidad y deben adaptarse para responder al modelo educativo.
Fomentando una cultura de honestidad académica entre el alumnado de grado
Authors: Gallent Torres Cinta
Published: March 2023

El presente artículo describe una experiencia de aula llevada a cabo en la asignatura de Lengua Francesa IV del Grado en Lenguas Modernas y sus Literaturas de la Universidad de Valencia (UV) durante el curso académico 2021-2022. Con el objetivo de sensibilizar al alumnado sobre la importancia de hacer un uso ético de la información digital que consultan y respetar las ideas de terceros sin realizar apropiaciones indebidas, se propone una serie actividades mediante las cuales se reflexiona, de forma colaborativa y a través de una metodología orientada a la acción, sobre el uso de la propiedad intelectual ajena en los trabajos académicos, y sobre la correcta citación de fuentes para evitar incurrir en prácticas plagiarias. Los resultados alcanzados ponen de manifiesto la necesidad de reforzar la competencia documental del alumnado para que sus estrategias de búsqueda sean más sólidas y efectivas. Asimismo, se incide en la necesidad de llevar a cabo acciones formativas, de sensibilización y concienciación por parte de la comunidad universitaria que fomenten de forma transversal el valor de la integridad, la honestidad y la responsabilidad en las aulas universitarias.
Autoeficacia y emociones del estudiantado de ciencias en la enseñanza básica durante la investigación en línea. Un estudio exploratorio en Chile
Authors: Joglar Carol , Quintanilla Gatica Mario Roberto , Rodríguez Malabrán Mariano Eliseo , Soler Aqueveque Bárbara Monserrat
Published: March 2023

Alta percepción de autoeficacia (PAE) y sentir emociones positivas durante la búsqueda y gestión de la información en internet generan motivación en los estudiantes y son factores relevantes que inciden en su rendimiento académico. Por lo tanto, este estudio buscó identificar, caracterizar y analizar, a través de un cuestionario tipo Likert, la PAE y emociones mencionadas por 334 estudiantes de 5° y 6° año de enseñanza básica, pertenecientes a cinco colegios vulnerables de la Región Metropolitana de Chile, durante la realización tareas de búsqueda y gestión de información en ciencias.

Se identificaron dos perfiles de respuestas, siendo 39% pertenecientes al perfil 1 (baja PAE y emociones negativas) y el 61% al perfil 2 (alta PAE y emociones positivas). La caracterización indica que, en los perfiles, la PAE y las emociones de los estudiantes tiene relación con el colegio al cual pertenecen, además, los alumnos de 5° básico tiene una PAE más baja, que los de 6°. Los colegios cuyos estudiantes tienen una baja PAE, también indican emociones negativas durante la realización de la tarea, evidenciando que la educación emocional y la enseñanza de competencias informacionales contribuyen a enfrentar mejor la resolución de la tarea en ciencias y el aprendizaje.
Variables que explican la competencia digital del docente universitario en el uso de recursos TIC para atender a estudiantes con discapacidad
Authors: Fernández-Cerero José , Román Graván Pedro
Published: March 2023

El creciente aumento del alumnado con discapacidad en las aulas universitarias manifiesta la necesidad de mejorar determinados aspectos en el sistema educativo, siendo el docente el eje principal. La finalidad principal del estudio es evaluar el grado de conocimiento que tienen los docentes universitarios acerca de cómo utilizar herramientas tecnológicas para brindar apoyo a estudiantes con discapacidades; e identificar variables académicas y demográficas que explican significativamente el desarrollo de la competencia digital docente en el contexto universitario. La metodología del presente estudio consiste en una investigación transversal con enfoque descriptivo y predictivo realizado a un total de 2072 profesores universitarios procedentes de diferentes comunidades autónomas, siendo evaluado a través de un instrumento compuesto por 56 ítems. Los resultados de la investigación advierten de la baja formación de los docentes universitarios en la competencia digital como apoyo al alumnado con algún tipo de discapacidad, además de confirmar que la edad y el género no son factores que repercutan en la formación del profesorado, al contrario de la experiencia de estos y la titularidad del centro educativo.
Seguimiento de una colonia de cría de garcilla bueyera Bubulcus ibis L. 1758 recientemente formada en la costa vasca (golfo de Vizcaya)
Authors: Galarza Aitor
Published: March 2023

Se describe la evolución de una colonia de garcilla bueyera Bubulcus ibis situada en la isla de Izaro (País Vasco), así como algunos aspectos de su reproducción hasta la fecha no estudiados para el caso de las poblaciones de la Europa atlántica, una región colonizada a finales del siglo pasado. La colonia aumentó de forma continuada desde su formación en 2016 hasta alcanzar los 90 nidos en 2022. La primera puesta se detectó el 24 de abril, y junio fue el mes en el que se contabilizó un mayor inicio de puestas (Mediana=10 de junio). El tamaño medio de puesta fue de 2,98 (±0,78; n=157; rango = 1-5), el tamaño medio de la pollada 2,33 (±0,79; n=157) y la colonia tuvo un éxito reproductor del 71,7% (n=106). El conteo del número de garcillas que utilizaban el dormidero principal apunta a que la mayoría abandonan durante el invierno las campiñas cercanas a la colonia
Evolución histórica de la protección constitucional e internacional de los derechos de la mujer
Authors: Pazo Pineda Oscar Andrés
Published: March 2023

En el presente artículo se analiza la evolución de la protección de los derechos fundamentales de las mujeres. Se iniciará examinando las razones que han conducido a una discriminación de carácter histórico en su contra, y, posteriormente, se analizarán las medidas que, progresivamente, se han introducido en el ámbito estatal e internacional con la finalidad de incentivar un trato igualitario respecto de los hombres.
College Student's Perception Towards Listening Health During COVID 19 An Online Survey
Authors: Mathew Aiswarya Maria , Ganapathy Kanaka , Bhargavi P G
Published: March 2023

Background:

The current pandemic has shifted the teaching-learning modality to online. Hence, the current use of headphones or earphones is not limited to listening to music or movies and engaging in learning.

Aim:

The study aimed to investigate students' behaviours in terms of their attitudes and awareness of listening health problems

Methodology:

The questionnaire was administered using Google Forms. The data on hearing health, attitude and noise reduction behaviours were captured from 500 college-going students aged 18-24 using a questionnaire developed by Gilliver, Beach and Williams [1].

Results:

Regarding hearing health indicators, 21.2% rated their hearing as “almost perfect”, and 34.8% rated it as “very good”. In terms of knowledge and attitude regarding noise exposure - 75.6% of the participants “understand the importance of good hearing”, and most of them (41.6%) agree that “noise exposure can cause hearing loss and damage is permanent”. Regarding noise reduction behaviour - 70% “undertook steps to prevent noise exposure”, and 53.3% reported making it to the point of “avoiding and limiting noise exposure”.

Conclusion:

With the increased involvement of students in online activity during the current COVID-19 pandemic, there is an increased need to conduct an awareness program regarding hearing health. These preventive measures would help for better hearing and listening and avoid the risk of hearing loss due to prolonged use of headphones/earphones.
Evaluation the Effect Of Chronic Obestatin Therapy on the Serum Glucose, Insulin And Lipid Levels in Type 2 Diabetic Rats
Authors: Al-Halbouni Safa , Homsi Shadi , koshji Nabil
Published: March 2023

Background:

Diabetes mellitus (DM) is one of the most common health disorders, which has become increasingly common in recent years. Type 2 diabetes affects about 90-95% of all diabetic patients, and is often associated with obesity and insulin resistance in most patients. The medical treatment aims to reduce insulin resistance and increase the production of insulin by pancreatic β-cells.

Obestatin is a new hormone encoded by the Preghrelin gene. Obestatin is an anorexic hormone that reduces food intake. It has also been shown to play an important role in regulating glucose and lipid levels in the blood.

Study Aim:

Our study aims to evaluate the therapeutic benefit of obestatin in rats with experimental type 2 diabetes in reducing blood glucose and improving insulin levels, and its effect on insulin resistance, TG, TC and pancreatic β-cell survival.

Methods:

A total of 30 male Wister rats (150 -200g) were randomly divided into three groups: group I (control group), group II (T2DM group) induced by administration fructose solution 10% for 14 days, and single injection IP of streptozotocin (STZ) (35 mg/Kg), group III (T2DM treated with obestatin) (25 μg/kg) IP twice daily for 30 days. Blood samples were collected at the end of the experiment by terminal intracardiac sampling for bioassays to estimate fasting glucose, insulin, triglyceride (TG), total cholesterol (TC), and assessment of HOMA-IR. Body weight was also measured. Mean ± STD was calculated. The statistical significance of differences across the groups was determined by one-way ANOVA followed by a post Hoc Turkey’s test. The differences were considered significant at 0.05˃P.

Results:

After 30 days of obestatin treatment, the diabetic group showed a significant increase in glucose, TG, TC and HOMA-IR values and a significant decrease in insulin levels compared to the control group. In comparison, the obestatin-treated group of diabetic patients showed a significant decrease in glucose, TG and TC levels, with a slight increase in the insulin level compared to the diabetic group. In addition, the histological study (H&E) of isolated pancreatic tissue from the second group showed deformed, shrunken Langerhans islets with significant loss of their β- cells, and some cells with vacuolated cytoplasm. Moreover, the histological features of the treatment group were somewhat similar to those of the control group.

Conclusion:

The results of our study showed the efficacy of obestatin as a treatment in reducing the levels of all glucose, triglycerides and total cholesterol in the blood to normal limits in induced experimental rats with type 2 diabetes. Moreover, the improvement of insulin levels in the blood, and the results of the histological study showed an improvement in the size of the islet and an increase in the number of β-cells. Thus, obestatin can be used as a promising target in the treatment of metabolic diseases such as diabetes and obesity.
Identification of HR management training approaches on sustainable public service administration skills in Indonesia
Authors: Muhani Urai
Published: March 2023

This research article aimed to identify HR management training approaches that can enhance sustainable public service administration skills in Indonesia. The study reviewed the literature on HR management training approaches, including e-learning, job rotation, cross-functional teams, and performance management. The researcher may conduct a literature review focusing on the study's objectives, such as locating HR management training methods that improve Indonesia's sustainable public service administration skills. The literature review should be comprehensive, including current and pertinent publications. The research also explored the potential barriers to practical HR management training in Indonesia and the role of technology in HR management training. The findings of this study suggest that e-learning can provide cost-effective training opportunities, job rotation can enhance employees' skills and knowledge, cross-functional teams can facilitate knowledge sharing and collaboration, and performance management can set clear performance expectations and provide regular feedback and coaching. The study also highlights the need for further research to evaluate the effectiveness of different HR management training approaches, identify barriers to practical training, and explore the role of technology in HR management training.
OUTSOURCING AND TRUST TOWARDS USERS' SATISFACTION THROUGH THE COMPANY'S PERFORMANCES IN PUTRA MENTARI INCORPORATION
Authors:   Master of Management, Faculty of Economics and Business, Universitas Brawijaya, Indonesia, Finarsih Eldining Wahyu , Setiawan Margono ,   Faculty of Economics and Business, Universitas Brawijaya, Indonesia, Salim Ubud ,   Faculty of Economics and Business, Universitas Brawijaya, Indonesia
Published: March 2023

This research was conducted on how the company's performance affected the company's satisfaction. The purpose of this study is to determine whether outsourcing and trust affect user company satisfaction through company performance as a mediation, whether it has a significant effect or not. The method used for this research was descriptive quantitative. The data were collected by spreading close questionnaires to Gracia Optima Incorporation Inc. and Bintang Prima Kemasindo Inc. as the clients of Putra Mentari Inc., an outsourcing company. In this study, PT Gracia Optima Masterpro and PT Bintang Prima Kemasindo are the populations, and samples were taken from 33 samples from both companies. This study used a saturated sampling technique using all the leaders and staff in both companies. The result showed that trust and good outsourcing given by Putra Mentari Inc. were the keys to getting the clients' satisfaction. It is hoped that the next research can break down the outsourcing variables and package them in more detail and specifically related to the work contract. Trust is one of the most influencing factors that outsourcing companies must maintain to keep the cooperation running for such a long period. It is also supported by good performance. This research could also function as a new insight into future research about the theories, trust, satisfaction, and performance in outsourcing practices.
Simulation of the features of the magnetic properties of axisummetric granules of hard type II superconductors
Authors: Kuzmichev N. D.  , Shushpanov A. A.  , Vasyutin M. A.
Published: March 2023

Based on the equations of electrodynamics and the concept of a critical state for hard superconductors of the 2nd kind, numerical simulation of the magnetic properties of axisymmetric superconducting samples, in particular, granules, is performed for a number of models of the dependence of the critical current density on the magnetic field induction. The magnetic moment loops are calculated directly by integrating the integral equation for the current density over time. The phenomena of the peak effect and the asymmetry of the magnetization hysteresis loop are also considered using the indicated equation. Various versions of the functions used in the literature were used as peak functions. In addition to the hysteresis loop of the magnetic moment, the magnetic field induction at the center of axisymmetric samples, and the total penetration field, the profiles of the critical current density Jc(B) and the equilibrium magnetic moment for spherical granules were obtained. The method used for calculating the magnetic moment of superconductors makes it possible to take into account the equilibrium and nonequilibrium regions of the magnetization of the samples independently Keywords: magnetic moment, axisymmetric granules, type II superconductor, critical state, peak effect, equilibrium magnetic moment.
Electron microscopy of the microstructure of antimony thin films of variable thickness
Authors: Kolosov V. Yu.  , Yushkov A. A  , Veretennikov L. M.  , Bokuniaeva A. O.
Published: March 2023

Thin Sb films with a thickness gradient deposited in vacuum were investigated by transmission electron microscopy. Microstructures in films with increasing thickness change from amorphous islands of increasing density and size to labyrinthine and continuous films with texturing, which also changes with increasing thickness. Based on the analysis of the patterns of bend extinction contours, a strong internal bending of the crystal lattice, up to 120 deg/μm, and the dependence of the crystallographic orientations in the structures of the film on the thickness were revealed. Keywords: Antimony, thin films, TEM, crystallography, extinction bend contours.
Sputtering of carbide films from the surface of the metal by helium ions bombardment
Authors: Manukhi V.V.
Published: March 2023

The paper investigates the dependence of the sputtering yields by light ions bombardment of the surface layers of titanium and tungsten, modified with carbon, on the thickness of the layer. The theoretical study was conducted on the basis of a sputtering model (previously adapted to describe the sputtering of two-component targets and layered-inhomogeneous surfaces), based on two sputtering mechanisms, which allows to analyze the obtained dependencies. Theoretical calculations of the total yields sputtering by helium ions bombardment of the surface layers of titanium and tungsten modified with carbon are given in comparison with the results of computer simulation obtained using the SRIM-2013pro program. Keywords: modified surface, ion bombardment, sputtering, light ions, layered surface, metal carbide, sputtering yield, partial sputtering yield.