bluuebunny/crossref_metadata_2025_split huggingface dataset:
Diagnóstico sobre hábitos de estudio en universitarios de nuevo ingreso como herramienta para identificar oportunidades de mejora
Authors: Román Fuentes Juan Carlos , Franco Gurría Rafael Timoteo , Román Julián Rebeca 
Published: July 2020

Con el objetivo de diagnosticar los hábitos que los universitarios de nuevo ingreso declaran cuando desarrollan actividades relacionadas con el estudio, para identificar áreas de oportunidad que sirvan como referente al emprender procesos de rediseño curricular y de planeación académica, esta aportación indaga sobre las prácticas que los estudiantes suelen realizar de forma cotidiana cuando se trata de estudiar. Esto mediante la aplicación de un test que identifica hábitos que los estudiantes poseen cuando son matriculados en alguna de las cinco licenciaturas (Administración, Contaduría, Gestión Turística, Sistemas Computacionales y Diseño de Software) que ofrece la Facultad de Contaduría y Administración, Campus I (FCA, CI) de la Universidad Autónoma de Chiapas (Unach). El instrumento utilizado se adaptó del planteado por Huidobro, Gutiérrez y Condemarín (2000). Así, al final, constó de 39 reactivos con respuestas dicotómicas (Sí / No), a través de las cuales se midieron ocho dimensiones: Ambiente físico, Estado fisiológico, Distribución de tiempo, Lectura, Técnicas de estudio, Preparación de pruebas, Concentración y Actitud hacia el estudio. Mediante plataforma electrónica, la aplicación fue autoadministrada, y se abarcó a toda la población matriculada en las cinco licenciaturas de cada ciclo escolar participante: un total de 1630 estudiantes. De manera general, los resultados arrojan que en promedio cerca de 8 (7.9) de cada 10 estudiantes tiene dificultades para realizar actividades relacionadas con la lectura y 6 (5.9) de cada 10 declara problemas para distribuir el tiempo. Asimismo, a nivel global, en promedio 23 % de los participantes obtiene ponderaciones aceptables solo en dos de las ocho dimensiones exploradas (aunque por licenciatura este promedio presenta diferencias importantes); 26 % entre tres y cuatro; 30 % entre cinco y seis, y solo 21 % declara siete u ocho dimensiones aceptables. Estos resultados podrán emplearse como referentes para diseñar en el futuro programas sistemáticos y diferenciados de intervención académica que permitan fomentar y mejorar la lectura, las técnicas de distribución de tiempo, la mejora de la concentración y la creación de las condiciones físicas propicias para estudiar, e incluso para diseñar programas de capacitación sistemática del personal docente.
Development and Validation of an LC-MS/MS Method for Protodioscin Identification and Quantification in Herbal Supplements with Tribulus terrestris L.
Authors: Ștefănescu Ruxandra , Farczadi Lenard 
Published: July 2020

Abstract

Tribulus terrestris L. (TT) became a very popular plant due to its effects in sexual disorders. The pharmacological actions seem to be related with its content in sterolic saponins. Protodioscin has been reported to be the main compound from TT products with anabolic effects. Because of the popularity of the plant, numerous herbal supplements are consumed around the world. Quantification of steroidal saponins through HPLC methods is sometimes difficult. Several methods have been proposed but not all are reproducible. The aim of this study was to validate a LC MS/MS method for quantification of protodioscin in herbal supplements. Two herbal supplements found on the Romanian market have been chosen for this study. The compounds were separated on a C18 column with ammonium acetate buffer and acetonitrile as mobile phase. The ionization was performed in electrospray negative mode and detection of protodioscin was made by monitoring the sum of ions m/z 737.41, m/z 739.42 and m/z 755.42. In one of the herbal supplements, protodioscin was under the limit of quantification. In conclusion a simple and rapid method is proposed for the quantification of protodioscin in herbal supplements.
Hydrogen Production and Its Storage from Solar Energy
Authors: Doğan E. E. 
Published: July 2020

Abstract
The aim of this study is to increase the energy efficiency of the solar panel, to make the waste heat generated under the panel efficient and to store the electrical energy produced from solar panels in the form of hydrogen in boron nitride and boron carbide. Characterization of boron nitride and boron carbide was carried out with Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), differential thermal and thermogravimetric analysis (DTA/TG), Brunauer–Emmett–Teller (BET) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM/EDX). The specific surface areas and pore sizes of the boron nitride and boron carbide were determined as 78 and 20 m2/g; and 3.8 and 11.1 nm, respectively. DTA/TG thermograms showed that boron nitride degraded in one step in the temperature range of 30-550°C and boron carbide degraded in two steps. From experimental studies, approximately 8.7% energy efficiency was achieved and hydrogen energy was costless produced from a renewable energy source excluding system costs. Moreover, it was found that 276% and 208% more hydrogen could be stored in the boron compounds, the boron nitride had more hydrogen storage capacity, and the electrical efficiency of the panel was increased.
Normal complex contact metric manifolds admitting a semi symmetric metric connection
Authors: Vanli Aysel Turgut , Ünal Inan , Özdemir Dilek 
Published: July 2020

Abstract
In this paper, we study on normal complex contact metric manifold admitting a semi symmetric metric connection. We obtain curvature properties of a normal complex contact metric manifold admitting a semi symmetric metric connection. We also prove that this type of manifold is not conformal flat, concircular flat, and conharmonic flat. Finally, we examine complex Heisenberg group with the semi symmetric metric connection.
Optimization Technique for Pseudorange Multipath Mitigation Using Different Signal Selection Methods
Authors: Uaratanawong Valanon , Satirapod Chalermchon , Tsujii Toshiaki 
Published: July 2020

Abstract
Nowadays, the use of multi-Global Navigation Satellite System (GNSS) has improved positioning accuracy in autonomous driving, navigation and tracking systems utilized by general users. However, signal quality in urban areas is degraded by poor satellite geometry and severe multipath errors, which may disturb up to a hundred-meter-ranging error as a consequence. In this study, the performance of several satellite selection methods in multipath mitigation was evaluated, based on the concept that better quality signals and more accurate solutions will be obtained, the more multipath signals can be excluded. Three methods were performed and compared: 1) azimuth-dependent elevation mask based on fisheye image technique, 2) receiver autonomous integrity monitoring (RAIM), and 3) signal-to-noise ratio (SNR) mask in the SPP method. To examine the effect of the satellite selection methods on multipath error, the static test (single-point positioning (SPP) in real-time 1 Hz test) was performed in a multipath environment. The preliminary results showed a possible impact on improving the horizontal positioning accuracy of SPP. Among the three techniques assessed in this study, the results indicated that the SNR mask set at 36 dB-Hz in every elevation showed the most promising result. The SNR mask method could improve positioning accuracy by up to 46.80% compared to the SPP method.
Investigation of Physical and Sensory Properties of Ethiopian Specialty Dry Processed Green Coffee Beans
Authors: Wondimkun Yishak Worku , Emire Shimelis Admassu , Esho Tarekegn Berhanu 
Published: July 2020

Abstract
Ethiopia is known for its specialty Arabica coffees affected by mix-up. Physical and sensory properties of dry processed green coffee beans have been reported for the influence on the sensorial quality and coffee process optimization. The aim of this study was to investigate physical and sensory properties of sixteen varieties and to determine relationship of attributes. Physical properties of coffee beans were taken by measuring linear dimensions, densities and weight. Moreover, professional cuppers were analyzed sensory properties by using standard procedures. In this study, the longest (10.40 mm), the widest (6.82 mm) and the thickest (4.48 mm) varieties were Odicha, Feyate and Challa, respectively whereas the shortest (8.28 mm), narrowest (5.59 mm) and thinnest (3.52 mm) were 74110, Mocha and Bultum, respectively. The shape & make value of variety Bultum was “fair good” whereas variety Feyate was “very good”. Furthermore, the results of “shape & make” were significantly correlated with measured physical properties. The results indicate that most physical and sensory properties of coffee varieties have significant (P ≤ 0.05 differences. These properties were influenced by growing regions and variety difference. The outcome of this study can be used for coffee bean characterization and process optimization to improve beverage quality.
The Quality of Freeze-Dried and Rehydrated Blueberries Depending on their Size and Preparation for Freeze-Drying
Authors: Ochmian Ireneusz , Figiel-Kroczyńska Monika , Lachowicz Sabina 
Published: July 2020

Abstract
A significant increase in highbush blueberry plantings has been observed annually. However, there is a problem with the handling of fruit that does not meet the requirements for dessert berries. One of the methods to use the fruit is drying. The research was conducted in the Department of Horticulture at the West Pomeranian University of Technology in Szczecin. The fruit was harvested at a plantation specialising in the production of highbush blueberry from irrigated and non-irrigated plots. This study aimed to assess how cutting or pricking highbush blueberry fruit affects the duration of the sublimation drying process – freeze-drying. The biological value of fresh, freeze-dried, and rehydrated fruit was assessed. The amount of fruit left on bushes depended on the weather prevailing in the growing season, especially during the harvest period. The mass of fruit left on the bushes was approx. 1 to 2 t/ha. Although these fruits were small, they had a very high biological value. After freeze-drying and rehydration, the blueberry fruit retained their colour, high content of polyphenols and showed high antidiabetic activity and antioxidant capacity. The large fruit reached the moisture content of approx. 12%, which ensures safe storage and the appropriate texture, after 46 hours of drying, and the smaller fruit - after 32 hours. Fruit cutting or pricking reduced the drying time by half. Reducing this time decreased drying costs and increased biological value.
Comprehensive Assessment of the Properties of Cotton Single Jersey Knitted Fabrics Produced From Different Lycra States
Authors: Khalil Amany , Fouda Abdelmonem , Těšinová Pavla , Eldeeb Ahmed S. 
Published: July 2020

Abstract
This research aims to evaluate the properties of cotton single jersey knitted fabrics (SJKF) produced from cotton/spandex yarns at different Lycra states. So, four different SJKF were produced, namely 100% cotton, cotton with additional Lycra (full-platted), core, and dual-core-spun (DCS) yarns with the same loop length. The thermal comfort properties, fabric recovery, total hand value (THV), moisture management parameters, and air permeability were measured. The experimental results showed that the use of DCS yarns in the SJKF improves the fabric elastic recovery by 100%. The obtained values of air permeability, THV, and overall moisture management capacity of stretched SJKF are lower than 100% cotton fabric sample. Thermal absorptivity of core and dual-core samples increased by 27% and the water vapor permeability decreased by 18% compared to 100% cotton fabric sample.
Durability Assessment of Composite Structural Element Reinforced with Fabric due to Delamination
Authors: Marszałek Jerzy , Stadnicki Jacek 
Published: July 2020

Abstract
Layer composites reinforced with fabrics – laminates are construction materials in which mechanical properties can be shaped by designing their microstructure appropriately. However, the multi-phase microstructure of laminates makes it difficult to calculate the strength of the laminate constructions, especially when the reinforcement is a fabric. The article presents a special calculation model for determining the strength of an exemplary construction element made of laminate reinforced with a roving fabric with a plain weave made of carbon fibers. The computational model reflected in a simplified way the laminate microstructure, i.e. the number and orientation of the reinforcement fabric layers and its weave, and enabled a simulation of the behavior of the construction element under load up to fracture, which occurred as a result of breaking the reinforcement and interlayer crack – delamination. The simulation results were compared with the results of experimental stand tests. A method of modifying the computational model for laminates reinforced with non-plain weave was also suggested.
Monitoring vertebrate abundance in Austria: developments over 30 years
Authors: Semmelmayer Katharina , Hackländer Klaus 
Published: July 2020

Summary
Loss of biodiversity is one of the major challenges of the anthropocene. Various indices are used to quantify biodiversity. For vertebrates, the World Wide Fund for Nature (WWF) uses the Living Planet Index (LPI). It is calculated globally as well as separately for the species occurring in terrestrial, freshwater, and marine biomes. Action to prevent biodiversity loss can be taken by countries or provinces, so it is important to understand the changes in biodiversity at local scales. We present LPIs for vertebrates in Austria, both unweighted and weighted, according to species richness. Vertebrate populations seem to have declined strongly in Austria, and their abundance was stabilized at about 60% of the initial population size in the base year 1990—the LPI declined from 1 in 1990 to ~0.6 (unweighted) or ~0.7 (weighted) in 2015. This is almost double the global decline for the same period. LPIs were calculated separately for the terrestrial biome (~0.6), the freshwater biome (~0.9), birds (~0.7), and native species (~0.6). These indices give evidence that conservation measure to halt biodiversity loss in Austria is necessary and show where more data are needed. In Austria, more research is needed especially on populations of reptile species.
Effect of organic residues on soil properties of loamy topsoil of haplic Luvisol in Northern Germany
Authors: Beck-Broichsitter Steffen , Fleige Heiner , Horn Rainer 
Published: July 2020

Summary
The application of organic residues should ensure a sufficient air capacity (AC) and plant available water capacity (AWC) to improve the soil aeration and water supply for plant roots, whereas the air permeability (ka) primarily depends on the number of functional and, therefore, connected pores. The objective of the study was to investigate the effect of digestates derived from maize (Zea mays L.), sugar beet (Beta vulgaris L.), and wheat (Triticum aestivum L.) in ratios of 100%, 80%, and 20%, respectively; compost of shrub debris; and sewage sludge on AC, AWC, and ka values, including the pore continuity indices (c2, c3) of a loamy Ap horizon of a haplic Luvisol. The results indicate that AC values increase from 0.142 of up to 0.191 cm3 cm−3, but pore continuities and AWC values decrease from 0.143 down to 0.111 cm3 cm−3, except for wheat-containing digestate (20w80b), which shows an opposite trend. The application of organic residues can compensate low AC values but not the AWC values. The wheat-containing digestate should be preferred for improving the water-holding capacity and, therefore, the water supply for plant roots.
Professor Povilas Snarskis – Life Dedicated to the Research of Lithuanian Flora
Authors: Tupčiauskaitė Jūratė , Rimgailė-Voicik Radvilė 
Published: July 2020

AbstractThe paper presents a brief biography of Professor Povilas Snarskis, and discusses the importance of his work for Lithuania. After defending PhD at Vytautas Magus University, P. Snarskis was able to collect invaluable data on the Lithuanian floristic diversity and distribution. He actively participated in the development of the Lithuanian higher education. In 1947, he became a professor and taught botany at Vilnius University and Vilnius Pedagogical Institute. During his professional career, P. Snarskis has published about 60 research and popular science works. He was a co-author of Flora of Lithuanian SSR and his three guides to native vascular plants still have their high value. The number of Snarskis’ herbarium specimens deposited at Vilnius University Herbarium (WI) and the Nature Research Centre, Institute of Botany Herbarium (BILAS) exceeds 20.000. P. Snarskis was an innovator, who used his logic and creativity, and constructed guidelines to achieve his goals in difficult historical times.
Fuzzy Group Full Consistency Method for Weight Determination
Authors: Ilieva Galina 
Published: July 2020

Abstract
In this paper, the FUll COnsistency Method (FUCOM) is extended to work in a collective manner, to solve a fuzzy optimization problem and to obtain the fuzzy weights of criteria. The employment of a predefined order of criteria decreases the number of fuzzy comparisons needed in the evaluation phase. The defuzzified values of the optimal weight coefficients are calculated by Graded Mean Integration Representation formula. This feature also reduces time complexity without affecting the quality of the solution. Two practical examples are presented to verify the reliability and feasibility of the proposed fuzzy group FUCOM. The obtained results demonstrate that the new fuzzy group weight determination method can obtain appropriate criteria importance.
DevOps Project Management Tools for Sprint Planning, Estimation and Execution Maturity
Authors: Angara Jayasri , Prasad Srinivas , Sridevi Gutta 
Published: July 2020

Abstract
The goal of DevOps is to cut down the project timelines, increase the productivity, and manage rapid development-deployment cycles without impacting business and quality. It requires efficient sprint management. The objective of this paper is to develop different sprint level project management tools for quick project level Go/No-Go decision making (using real-time projects data and machine learning), sprint estimation technique (gamified-consensus based), statistical understanding of overall project management maturity, project sentiment & perception. An attempt is made to device a model to calibrate the perception or the tone of a project culture using sentiment analysis.
Advanced Embedded Control of Electrohydraulic Power Steering System
Authors: Slavov Tsonyo , Mitov Alexander , Kralev Jordan 
Published: July 2020

Abstract
The article presents a developed embedded system for control of electrohydraulic power steering based on multivariable uncertain plant model and advanced control techniques. The plant model is obtained by identification procedure via “black box” system identification and takes into account the deviations of the parameters that characterize the way that the control signal acts on the state of the model. Three types of controller are designed: Linear-Quadratic Gaussian (LQG) controller, H∞ controller and μ-controller. The main result is a performed comparative analysis of time and frequency domain properties of control systems. The results show the better performance of systems based on µ-controllers. Also the robust stability and robust performance are investigated. All three systems achieved robust stability which guarantees their workability, but only the system with µ-controller has robust performance against prescribed uncertainties. The control algorithms are implemented in specialized 32-bit microcontroller. A number of real world experiments have been executed, which confirm the quality of the electrohydraulic power steering control system.
Growth and Sex Ratio of Octopus Paroctopus Digueti (Perrier & Rochebrune, 1894) in a Wild Population
Authors: Granados-Alcantar Salvador , Escamilla-Montes Ruth , Diarte-Plata Genaro , Fierro-Coronado Jesús A. 
Published: July 2020

Abstract
In Mexico, studies of octopus Paroctopus digueti are scarce, thus the objective of this research is to evaluate some of its biological aspects in Ohuira Bay, Ahome, Sinaloa, Mexico. From autumn 2016 to autumn 2017, a total of 217 organisms of P. digueti were collected, from which 166 were females, 31 ovigerous females and 20 males. The lengths of the mantle (ML), tentacles or arms (AL) and total length (TL) were recorded as well as the total weight (TW) of each organism. The software FiSAT II was used to obtain the growth parameters by mediating seasonal size frequencies. Considering both sexes, the average registered mantle length was 40.31±2.5 mm. For the analysis of ML-TL y ML-AL, the data were adjusted to a linear-type model. For the relationship between ML-TL, the minimum determination coefficient was observed during spring R2 = 0.335, and the highest was registered in winter R2 = 0.6452. With regards to the allometry coefficient (b), it was different among the 4 climatic seasons. The theoretical ML growth curve showed both sexes of ML∞= 73.50 mm, K = 1.30 year−1 and t0= 0.10. The estimated values from the growth equation revealed faster growth (ML∞= 63 mm) within the 1.2 years of their lives, reaching a maximum length at 2.5 years of age. The total weight growth curve of P. digueti octopus was formed by an exponential first stage up to six months and the second logarithmic stage from seven months to approximately 1.8 years. In the summer there were slightly lower coefficients and percentages of instantaneous growth coefficients (IGC) for the lengths and total weight of octopus P. digueti. The highest Fulton’s condition index (k) was recorded in winter. The sex ratio was significant in a proportion of 9.85 F:1 M.
Growth, Gut Morphology and Microflora of African Catfish Clarias gariepinus Fed Mushroom (Pleurotus pulmonarius) Stalk Meal Supplemented Diets
Authors: Adejonwo Oluwakemi Abimbola , Omitoyin Bamidele Oluwarotimi , Ajani Emmanuel Kolawole , Ogunwole Olugbenga Adeniran , Omitoyin Siyanbola Adewumi 
Published: July 2020

Abstract
Effects of dietary supplementation of Pleurotus pulmonarius stalk meal on growth, gut microflora and intestinal morphology of Clarias gariepinus were assessed in this study. The stalk meal was incorporated at 0.0 g/100 g (Control), 2.5 g/100 g (PSM 2), 5.0 g/100 g (PSM 3), 7.5 g/100 g (PSM 4) and 10.0 g/100 g (PSM 5). Clarias gariepinus (n=375), with an initial weight of 10.84±0.04 g, were allotted at 25 fish/60 litres of water in a completely randomised design for each diet treatment in triplicate. Feeding trial was conducted for eight weeks. Weight gain, specific growth rate, survival rate, feed intake and feed conversion ratio were not significantly different across all diet treatments. However, the production performance index of the fish and protein efficiency ratio were higher in fish fed PSM 3 diet than other treatments. Total viable bacteria count in the gut ranged from 7.56 (PSM 2) to 8.34 log10 cfu/g (PSM 4), while lactic acid bacteria count was between 5.00 (control) and 7.03 log10 cfu/g (PSM 3). Escherichia coli were identified in the gut of the control group but were not detected in those fed supplemented diets. More colonies of Salmonella and Vibrio species were observed in the control but fewer colonies in the diets supplemented groups. The proximal, middle and distal villus length, proximal, middle and distal cryptal depth, proximal and distal absorption area of fish fed supplemented diet were higher than those of the control. Conversely, proximal, middle and distal villus width and middle absorption area were not significantly different. In spite of observable favourable gut microflora and gut histomorphology of fish fed supplemental P. pulmonarius stalk meal diet, these attributes did not manifest in growth performance indices.