bluuebunny/crossref_metadata_2025 huggingface dataset:
Company Value, Real Options and Financial Leverage
Authors: Drahovzal O.
Published: March 2021

This paper deals with determining of the value of companies and financial leverage. The author tries to find the optimum debt ratio for selected companies in the Czech Republic. The method of yield option extension is used for evaluating a company. The DCFC method was selected as the yield method, due to its simplicity. The dynamic model used allows us to make changes in the debt ratio with recalculations of all parameters that depend on it. The assessment is made from two points of view: Firstly, the maximum of the total amount of financial resources, and, secondly, the maximum of the inverse sums of the ROE index and the ratio of equity to the value of the company. The values of the total debt ratio and the long-term debt ratio are shown as results.
Fiber Optic Detection of Ammonia Gas
Authors: Kalvoda L. , Aubrecht J. , Klepáček R.
Published: March 2021

Bathochromic shifts accompanying the formation of several bivalent metallic complexes containing 5-(4’-dimethylaminophenylimino) quinolin-8-one (L1), and 7-chlore-5(4’-diethylamino-2-methylphenylimino) quinolin-8-one (L2) ligands in ethanol solutions were evaluated by VIS-NIR spectroscopy. The [L1-Cu-L1] sulphide complex was selected as a reagent for further tests on optical fibres. Samples of multimode siloxane-clad fused-silica fibre were sensitized by diffusing an ethanol/chloroform solution of the dye into the cladding polymer, and tested by VIS-NIR optical spectroscopy (12 cm long fibre sections), and optical time domain reflectometry (OTDR; 20 ns laser pulses, wavelength 850 nm, 120 m long fibre sensitized within the interval 104–110 m). A well-resolved absorption band of the reagent could be identified in the absorption spectra of the fibres. After exposure to dry ammonia/nitrogen gas with increasing ammonia concentration (0–4000 ppm), the short fibre samples showed subsequent decay of NIR optical absorption; saturation was observed for higher ammonia levels. The concentration resolution r ? 50 ppm and forward response time t90 ? 30 sec were obtained within the interval 0–1000 ppm. The OTDR courses showed an enhancement of the back-scattered light intensity coming from the sensitized region after diffusion of the initial reagent, and decay after exposure to concentrated ammonia/nitrogen gas (10000 ppm).
Performance Aspects of Sparse Matrix-Vector Multiplication
Authors: Šimeček I.
Published: March 2021

Sparse matrix-vector multiplication (shortly SpM×V) is an important building block in algorithms solving sparse systems of linear equations, e.g., FEM. Due to matrix sparsity, the memory access patterns are irregular and utilization of the cache can suffer from low spatial or temporal locality. Approaches to improve the performance of SpM×V are based on matrix reordering and register blocking [1, 2], sometimes combined with software-pipelining [3]. Due to its overhead, register blocking achieves good speedups only for a large number of executions of SpM×V with the same matrix A.We have investigated the impact of two simple SW transformation techniques (software-pipelining and loop unrolling) on the performance of SpM×V, and have compared it with several implementation modifications aimed at reducing computational and memory complexity and improving the spatial locality. We investigate performance gains of these modifications on four CPU platforms.
A Porosity Method to Describe Complex 3D-Structures Theory and Application to an Explosion
Authors: Robbe M.-F.
Published: March 2021

A theoretical method was developed to be able to describe the influence of structures of complex shape on a transient fluid flow without meshing the structures. Structures are considered as solid pores inside the fluid and act as an obstacle for the flow. The method was specifically adapted to fast transient cases.The porosity method was applied to the simulation of a Hypothetical Core Disruptive Accident in a small-scale replica of a Liquid Metal Fast Breeder Reactor. A 2D-axisymmetrical simulation of the MARS test was performed with the EUROPLEXUS code. Whereas the central internal structures of the mock-up could be described with a classical shell model, the influence of the 3D peripheral structures was taken into account with the porosity method.
Multi-agent Contracting and Reconfiguration in Competitive Environments using Acquaintance Models
Authors: Bíba J. , Vokřínek J.
Published: March 2021

Cooperation of agents in competitive environments is more complicated than in collaborative environments. Both replanning and reconfiguration play a crucial role in cooperation, and introduce a means for implementating a system flexibility. The concepts of commitments, decommitments with penalties and subcontracting may facilitate effective reconfiguration and replanning. Agents in competitive environments are fully autonomous and selfinterested. Therefore the setting of penalties and profit computation cannot be provided centrally. Both the costs and the gain differ from agent to agent with respect to contracts already agreed and resources load. This paper proposes an acquaintance model for contracting in competitive environments and introduces possibilities of reconfigurating in competitive environments as a means of decommitment optimization with respect to resources load and profit maximization. The presented algorithm for contract price setting does not use any centralized knowledge and provides results corresponding to a realistic environment. A simple customerprovider scenario proves this algorithm in competitive contracting.
A Reservation Aggregation Framework Design for Demand Estimation
Authors: Vítek T. , Pachner D.
Published: March 2021

Effective management practices in the tourism and hotel area have seldom been more important than at the present time. Pricing decisions cannot be taken without serious thought. IT has provided the opportunity for a customer to make a quick market search and it offers decision support systems that can be used in the hotel management. The heart of yield management system consists of the predicting machine, which estimates the number of incoming reservations. Incoming reservations arrive randomly in time. The time series calculi as well as the estimators known from control engineering require properly defined time rows (with a constant period). This requirement is usually not fulfilled, so the input data are not exploited properly. This paper outlines a procedure that aggregates the reservations into a time series that is useful for demand prediction. The algorithm prepares the data systematically for further processing. Any method that process time rows can be used for subsequent prediction: time series, linear models or time extrapolation.
Evaluation of Audio Compression Artifacts
Authors: Martinez M. Herrera
Published: March 2021

This paper deals with subjective evaluation of audio-coding systems. From this evaluation, it is found that, depending on the type of signal and the algorithm of the audio-coding system, different types of audible errors arise. These errors are called coding artifacts. Although three kinds of artifacts are perceivable in the auditory domain, the author proposes that in the coding domain there is only one common cause for the appearance of the artifact, inefficient tracking of transient-stochastic signals. For this purpose, state-of-the art audio coding systems use a wide range of signal processing techniques, including application of the wavelet transform, which is described here.
The Symbolic-Aesthetic Dimension of Industrial Architecture as a Method of Classification and Evaluation: the Example of Bridge Structures in the Czech Republic
Authors: Popelová L.
Published: March 2021

This paper deals with the symbolic-aesthetic dimension of industrial and technical structures as a possible category for classifying and evaluating such structures. This category should play an important role in assessing the value of industrial and technical structures so that they are thoroughly and properly assessed as a part of our cultural heritage. This paper was presented at the XIII International TICCIH Congress in Terni in 2006.
Computer Insight into the Molecular Level of Heart Failure. What is the Role of NCX?
Authors: Fischer M. , Mlček M. , Konvičková S. , Kittnar O.
Published: March 2021

Though congestive heart failure is a leading cause of death in our population, the pathophysiological mechanisms at molecular level remain to be elucidated. This paper discusses the contribution of NCX to the pathological pattern of intracellular calcium regulation and contraction on the basis of computer simulations of a virtual cell. The model comprises calcium handling mechanisms, troponin control and acto-myosin interactions. The contribution of NCX was studied by changing its activity and turning it off for some simulations.It was found that NCX helps to support diastolic function by reducing the Ca2 level during the diastole. At the same time there is a reduction in peak Cai and hence contraction. However, increased NCX activity does not seem to improve calcium handling and contraction crucially, as has been suggested by some authors.
Effect of the Hydraulic Characteristics of a Stream Channel and its Surroundings on the Runoff Hydrograph
Authors: Matoušek V.
Published: March 2021

The course and magnitude of a rainfall flood depends primarily on the intensity and duration of the rainfall event, on the morphological parameters of the watershed (e.g. its slope and shape), and on how to watershed has been exploited. A flood wave develops in the stream channel that drains the watershed, and it transforms while passing along the channel. This is particularly the case if the water spreads into floodplains and/or storage reservoirs while passing through the channel. This paper addresses an additional effect that has a significant influence on the magnitude and course of the flood wave but has not previously been addressed adequately, namely the effect of the hydraulic parameters of the stream channel itself on the transformation of a flood wave. The paper explains theoretically and shows on a practical example that a smooth channel with a high capacity significantly increases the magnitude and speed of a flood wave.Many flood events are unnecessarily severe just because the watershed is drained by a hydraulically inappropriate channel. The channel is large and smooth and therefore it gathers most of the flowing water during the flood event, producing high water velocity in the channel. As a result, the large and smooth channel accelerates the runoff from the watershed and constrains the spread of water into the floodplain. A high and steep flood wave is developed in the channel, and this floods areas with a limited water-throughput capacity (e.g. urban areas in the vicinity of hydraulic structures) downstream the channel. This paper offers a methodology for evaluating the ability of a channel to convey a flood wave safely and for recognizing whether a regulated channel should be subjected to restoration due to its inability to convey flood waves safely.
PT-symmetry and Integrability
Authors: Fring A.
Published: March 2021

We briefly explain some simple arguments based on pseudo Hermiticity, supersymmetry and PT-symmetry which explain the reality of the spectrum of some non-Hermitian Hamiltonians. Subsequently we employ PT-symmetry as a guiding principle to construct deformations of some integrable systems, the Calogero-Moser-Sutherland model and the Korteweg deVries equation. Some properties of these models are discussed.
Dynamic Simulations in Cost and Time Estimation of the Construction Process
Authors: Beran V. , Hromada E.
Published: March 2021

This paper describes a model which is able to simulate the costs and the duration of construction for a building project. The model predicts the set of expected costs and the duration of the project depending on input parameters such as production rate, scope of the work, the time schedule, bonding conditions, maximum and minimum deviations from the scope of the work, and the production rate. Clients are able to make proper decisions concerning the time and cost schedules of their investments.
How Do Energies Complexify?
Authors: Bíla H.
Published: March 2021

Some particular properties of the parametric dependence of eigenvalues with emphasis on their complexification are discussed. The non-diagonalisability of PT-symmetric matrix Hamiltonians in exceptional points is compared with level-crossing prohibition of Hermitian systems. For non-matrix Hamiltonians, the different way of complexification between Klein-Gordon and Dirac Hamiltonians is demonstrated.
On a Quantum Waveguide with a Small PT-symmetric Perturbation
Authors: Borisov D.
Published: March 2021

We consider a quantum waveguide with a small PT-symmetric perturbation described by a potential. We study the spectrum of such a system and show that the perturbation can produce eigenvalues near the threshold of the continuous spectrum.
Matrices Associated to 3-Interval Exchange Transformation and their Spectra
Authors: Ambrož P.
Published: March 2021

A three by three integer matrix M is said to have the MEME Property if MEMT = ±E, where E = (contains matrix, view full text). We characterize such matrices in terms of their spectra.
Refactorisation methods for TTCN-3
Authors: Eros L. , Bozoki F.
Published: March 2021

In this paper we introduce automatic methods for restructuring source codes written in test description languages. We modify the structure of these sources without making any changes to their behavior. This technique is called refactorisation. There are many approaches to refactorisation. The goal of our refactorisation methods is to increase the maintainability of source codes. We focus on TTCN-3 (Testing and Test Control Notation), which is a rapidly spreading test description language nowadays. A TTCN-3 source consists of a data description (static) part and a test execution (dynamic) part. We have developed models and refactorisation methods based on these models, separately for the two parts. The static part is mapped into a layered graph structure, while the dynamic part is mapped to a CEFSM (Communicating Extended Finite State Machine) – based model.
31Lectures on Noncommutative Geometry
Authors: Sitarz A.
Published: March 2021

We present a short overview of noncommutative geometry. Starting with C* algebras and noncommutative differential forms we pass to K-theory, K-homology and cyclic (co)homology, and we finish with the notion of spectral triples and the spectral action.
Analysis of the Fuel Efficiency of a Hybrid Electric Drive with an Electric Power Splitter
Authors: Čundev D.
Published: March 2021

This paper presents the results of an analysis of the fuel efficiency of a hybrid electric car drive, with an electric power splitter based on a double rotor synchronous permanent magnet generator. The results have been obtained through a precisely determined mathematical model and by simulating the characteristics of all essential values for the entire drive. This work is related to the experimental working stand for electric and hybrid car drive research, which has been developed at the Faculty of Electrical Engineering (FEE) at CTU in Prague.
Signal Separation in Ultrasonic Non-Destructive Testing
Authors: Matz V. , Kreidl M. , Šmíd R.
Published: March 2021

In ultrasonic non-destructive testing the signals characterizing the material structure are commonly evaluated. The sensitivity and resolution of ultrasonic systems is limited by the backscattering and electronic noise level commonly contained in the acquired ultrasonic signals. For this reason, it is very important to use appropriate advanced signal processing methods for noise reduction and signal separation. This paper compares algorithms used for efficient noise reduction in ultrasonic signals in A-scan. Algorithms based on the discrete wavelet transform and the Wiener filter are considered. Part of this paper analyses and applies blind source separation, which has never been used in practical ultrasonic non-destructive testing. All proposed methods are evaluated on both simulated and acquired ultrasonic signals.
Development of Character Education Models in Madrasas Through the Establishment of the Tahajud Prayer
Authors: Supendi Pepen , Palah  , Hasanah Aan
Published: March 2021

This study aimed to examine and explore the development of student character education models through habituation of programmed tahajud prayers in MTs As-Sa'idah. This research uses a qualitative approach with descriptive methods. Data collection techniques are interviews, observation, and study of literature. The results of this study, are: First, the reality of education in the inheritance of the values ​​of character education through the process of habituating the programmed prayer; Second, the tahajud prayer is a character inheritance model that is able to preserve the values ​​of the Sunnah of the Prophet Muhammad. The inheritance model of character education through habituation of tahajud prayer are: 1) focus, derived from the doctrine of the Qur'an and Sunnah; 2) Procedure, using a direct learning model. And the Third, the character values ​​that can be implemented as a basis for character building show in 9 of character values.
Investigate the Structural Response of Ultra High Performance Concrete Column under the High Explosion
Authors: Mai Viet-Chinh , Luu Xuan-Bach , Dao Cong-Binh , Le Dinh-Viet
Published: March 2021

Most of the structures that are damaged by an explosion are not initially designed to resist this kind of load. In the overall structure of any building, columns play an important role to prevent the collapse of frame structure under blast impact. Hence, the main concept in the blast resistance design of the structure is to improve the blast load capacity of the column. In this study, dynamic analysis and numerical model of Ultra High Performance Concrete (UHPC) column under high explosive load, is presented. Based on the Johnson Holmquist 2 damage model and the subroutine in the ABAQUS platform, a total of twenty UHPC model of the column were calculated. The objective of the article is to investigate the structural response of the UHPC column and locate the most vulnerable scenarios to propose necessary recommendations for the UHPC column in the blast loading resistance design. The input parameters, including the effect of various shapes of cross-section, scaled distance, steel reinforcement ratio, and cross-section area, are analyzed to clarify the dynamic behavior of the UHPC column subjected to blast loading. Details of the numerical data, and the discussion on the important obtained results, are also provided in this paper.
Nevrološka prizadetost kot dejavnik kakovosti življenja starejših pacientov z multiplo sklerozo
Authors: Koprivnik Matej , Železnik Danica , Hojs Fabjan Tanja
Published: March 2021

Uvod: Kakovost življenja predstavlja pomembno dimenzijo življenja pacientov z multiplo sklerozo, na katero vplivajo številni dejavniki. Namen raziskave je ugotoviti vpliv nevrološke prizadetosti na telesno in duševno z zdravjem povezano kakovost življenja pacientov z multiplo sklerozo, starih med 50 in 59 let ter starejših od 60 let.Metode: Presečna raziskava je bila izvedena na vzorcu 130 pacientov z multiplo sklerozo, starih med 50 in 73 let. Ocenjeni so bili z razširjeno lestvico stopnje nevrološke prizadetosti, vprašalnikom o kakovosti življenja pri multipli sklerozi (telesna in duševna z zdravjem povezana kakovost življenja) in vprašalnikom o značilnostih pacientov z multiplo sklerozo. Uporabljeni so bili opisna statistika, Kolmogorov-Smirnov test, Spearmanov koeficient korelacije rangov in linearna regresijska analiza.Rezultati: Nevrološka prizadetost pri pacientih z multiplo sklerozo, starih med 50 in 59 let, vpliva na telesno z zdravjem povezano kakovost življenja (R² = 0,251, p < 0,001), pri pacientih, starih med 60 in 73 let, pa na telesno (R² = 0,250, p < 0,001) in duševno z zdravjem povezano kakovost življenja (R² = 0,063, p = 0,044).Diskusija in zaključek: Vpliv nevrološke prizadetosti se po 60. letu starosti s telesne razširi tudi na duševno raven življenja pacientov z multiplo sklerozo. Nevrološko prizadeti pacienti morajo biti z namenom ohranjanja kakovosti življenja med 50. in 59. letom spremljani na področju fizičnega zdravja, med 60. in 73. letom pa tudi na področju duševnega zdravja.
Dejavniki neizvedene zdravstvene nege
Authors: Bahun Mateja , Skela-Savič Brigita
Published: March 2021

Uvod: Neizvedena zdravstvena nega je koncept, ki se pojavlja v zdravstveni oskrbi pacientov po vsem svetu. Namen sistematičnega pregleda literature je opisati neizvedeno zdravstveno nego in pridobiti razumevanje povezanosti koncepta z dejavniki za njen nastanek.Metode: Uporabljen je bil sistematični pregled literature, izveden v podatkovnih bazah PubMed, CINAHL, Wiley library online, COBISS.SI februarja in marca 2020. Iskalni pojmi so bili: neizvedena zdravstvena nega, zamujena oskrba; v angleškem jeziku pa unfinished nursing care, missed nursing care, implicit rationing, care left undone. Iskalna strategija je temeljila na vključitvenih kriterijih: znanstvena revija, recenzirana publikacija, dostopnost v polnem besedilu, slovenski ali angleški jezik, obdobje 2015–2020. Rezultati so bili analizirani s tematsko analizo.Rezultati: Skupaj je bilo identificiranih 1.667 in v končno analizo vključenih 16 zadetkov: dva sistematična pregleda literature, dvanajst presečnih raziskav in dve opisni kvalitativni raziskavi, kar skupaj združuje rezultate 88.294 zaposlenih v zdravstveni negi iz 21 držav. Rezultati so pokazali tri skupine dejavnikov za neizvedeno zdravstveno nego: kadrovske značilnosti, značilnosti delovnega okolja in timsko delo s komunikacijo.Diskusija in zaključek: Rezultati kažejo, da so vzroki za neizvedeno zdravstveno nego kompleksni in nekonsistentni. Med državami se razlikujejo tudi zaradi različnih izobraževalnih sistemov v zdravstveni negi. Povezani so z dejavniki v zdravstveni organizaciji in značilnostmi medicinskih sester. Če želimo na nacionalni ravni ugotoviti količino in obseg neizvedene zdravstvene nege, potrebujemo lastne podatke o stanju na tem področju v Sloveniji.
Quantitative high-throughput assay to measure MC4R-induced intracellular calcium
Authors: Kumar Shree Senthil , Ward Marie-Louise , Mountjoy Kathleen Grace
Published: March 2021

The melanocortin-4 receptor (MC4R), a critical G-protein-coupled receptor (GPCR) regulating energy homeostasis, activates multiple signalling pathways, including mobilisation of intracellular calcium ([Ca2+]i). However, very little is known about the physiological significance of MC4R-induced [Ca2+]i since few studies measure MC4R-induced [Ca2+]i. High-throughput, read-out assays for [Ca2+]i have proven unreliable for overexpressed GPCRs like MC4R, which exhibit low sensitivity mobilising [Ca2+]i. Therefore, we developed, optimised, and validated a robust quantitative high-throughput assay using Fura-2 ratio-metric calcium dye and HEK293 cells stably transfected with MC4R. The quantitation enables direct comparisons between assays and even between different research laboratories. Assay conditions were optimised step-by-step to eliminate interference from stretch-activated receptor increases in [Ca2+]i and to maximise ligand-activated MC4R-induced [Ca2+]i. Calcium imaging was performed using a PheraStar FS multi-well plate reader. Probenecid, included in the buffers to prevent extrusion of Fura-2 dye from cells, was found to interfere with the EGTA-chelation of calcium, required to determine Rmin for quantitation of [Ca2+]i. Therefore, we developed a method to determine Rmin in specific wells without probenecid, which was run in parallel with each assay. The validation of the assay was shown by reproducible α-melanocyte-stimulating hormone (α-MSH) concentration-dependent activation of the stably expressed human MC4R (hMC4R) and mouse MC4R (mMC4R), inducing increases in [Ca2+]i, for three independent experiments. This robust, reproducible, high-throughput assay that quantitatively measures MC4R-induced mobilisation of [Ca2+]i in vitro has potential to advance the development of therapeutic drugs and understanding of MC4R signalling associated with human obesity.
Water balance study on green roof in Brazil
Authors: Herlane Costa Calheiros , Gomes Gonçalves Silva Fernanda , Silva Costa Luisa , Lins Macedo Silva Matheus
Published: March 2021

The present study aims to investigate the water balance in conventional and green roofs and also to monitor the development of peanut grass (Arachis repens Handro), relating the type of vegetation cover or not with its water retention capacity and, consequently, to obtain the coefficient of runoff for each scenario tested. The scenarios tested were: (1) conventional collection surface with fiber cement tile, (2) green roof structure with substrate and no plant, and (3) planted green roof. The rains incident on the roof were obtained for the city of Itajubá, in Minas Gerais, by the curve of i-d-f with 5min of duration and 5years of return period according to the recommendation of NBR 10844 (ABNT,1989). The volumes of storm water runoff and drained from the bottom of the roofs studied were collected in calibrated graduated containers. It was concluded that: the peanut grass showed satisfactory development and high recovery capacity; the peanut grass took only 1½ month to cover the entire roof; the coefficient of runoff of the green roof for intense rainy season was on average 0.569 and in the dry season it was 0.003. While the conventional roof presented average surface runoff coefficient of 0.995 for the rainy season and 0.901 for the dry season; the component of the green roof that contributed most to the rainwater retention was the substrate. Therefore, attention should be paid to the choice of substrate so that it can adequately grow the plant, retain rainwater and not contaminate the bottom drainage water of the roof that can be used for less noble uses.
Protective effects of ethanolic extract of Alhagi maurorum roots on renal failure induced by acetaminophen in mice
Authors: AL-Nafea Seham I , O Aljahdali Mohammed
Published: March 2021

The protective actions of ethanol Alhagi maurorum (AM) root ethanol extract on acetaminophen-induced oxidative stress and renal toxicity in mice was evaluated. Forty male SWR strain albino mice aged 8 weeks were grouped into five groups. G1 (n=5): as control. G2 (n=5): administered orally a single dose of acetaminophen (2000mg/kg). G3 (n=10) administrated orally 200 mg/kg of roots ethanol extract for one week then acetaminophen as G2 at 8th day and; G4 (n=10) administrated orally 400 mg/kg of roots ethanol extract for one week then acetaminophen as G2 at 8th day; G5 (n=10) administrated orally 600 mg/kg of roots ethanol extract for one week then acetaminophen as G2 at 8th day. At end of experiments, the mice were killed under anesthesia and blood samples were gathered to preform complete blood test (CBC), serum levels of urea and creatinine and oxidative stress biomarkers as superoxide dismutase (SOD), glutathione (GSH), and catalase (CAT) using available Elisa mice kits. Kidneys were removed and histologically examined. Acetaminophen intake significantly elevated WBCs, neutrophils, monocytes, urea and creatinine levels and significantly decreased RBCs, hemoglobin, hematocrit, GSH, SOD and CAT (P <0.05). Treatment with Alhagi maurorum roots extract especially high dose (600 mg/kg) resulted in decreased in WBCs, neutrophils, monocytes, urea and creatinine levels and significantly increased RBCs, hemoglobin, hematocrit, GSH, SOD and CATversusacetaminophen group. Alhagi maurorum root extract treatment similarly decreased renal histological alteration induced by acetaminophen. This study can be utilized as prove of reading that Alhagi maurorum ethanol root extract especially high dose might be administered to prevent renal destruction induced by acetaminophen due to its antioxidant activity
Revisiting the nature of dark sunspots: the sun as a heat engine
Authors: Kuzmich Soika Alexander
Published: March 2021

This work is a continuation of the author's studies,1,2,3 related to the elucidation of the physical nature of dark sunspots. They showed that the appearance of cold sunspots, the temperature of which is below the temperature of the photosphere, is incompatible with the second law of thermodynamics. Sunspots in the Sun's photosphere can only be hot. This article provides a thermodynamic analysis of the work of the Sun as a heat engine. It is shown that sunspots are dissipative structures that spontaneously appear in the photosphere of the Sun and ensure its viability as a source of optical radiation. Sunspots play the role of a cooler for the sun's global heat engine, and without them its radiant glow would be impossible, just like the operation of any heat engine without a cold heat sink. In addition, it is shown that all the phenomena of solar activity are caused by the operation of the photospheric heat engine of the Sun, in which sunspots are the source of heat.
Rancang Bangun Revolving Fund Document Management System
Authors: Jamaluddin Jamaluddin , Hidayah Nur Aeni , Hasanati Nidaul
Published: March 2021

Document Management System (DMS) adalah sistem berbasis komputer yang menyediakan penyimpanan berbasis web yang dapat diakses di berbagai tempat. DMS dapat mengurangi resiko kehilangan dokumen, memangkas biaya pengarsipan dokumen fisik dan dapat dicetak kembali. Universitas Islam Negeri (UIN) Syarif Hidayatullah Jakarta memiliki proses Ganti Uang Persediaan (GUP) yaitu mekanisme penggantian Uang Persediaan (UP) yang diberikan pada awal tahun anggaran, proses ini melibatkan banyak berkas penting dan seluruh fakultas. Oleh karena itu, DMS mencoba mendukung proses bisnis GUP ini dengan menyediakan media koordinasi antar unit dalam mengelola berkas maupun dokumen elektronik secara online untuk meminimalisir kecelakaan ataupun hilangnya berkas. Metode pengembangan sistem yang digunakan adalah Scrum dengan Unified Modeling Language (UML) sebagai tools perancangan sistem. Sistem dibangun menggunakan PHP dan MySQL. Mengacu dari hasil wawancara kepada Bapak Ady Cahyadi selaku Sekretaris SPI dan Bapak Rezky Mehta Setiadi sebagai Koor Divisi Kepatuhan dan Keuangan SPI, output berupa Revolving Fund Document Management System berbasis web ini mendukung pengelolaan dokumen, pengecekan proses dokumen dan koordinasi secara online pada proses GUP tingkat fakultas di UIN Jakarta.
Como a pandemia da Covid-19 vem afetando o cotidiano das comunidades universitárias do nordeste Brasileiro?
Authors: Lima Sousa de Carvalho Anne Gabriele , Pereira de Souza Alessa Cristina
Published: March 2021

A pandemia provocada pelo novo coronavírus (Sars-Cov-2) vem provocando efeitos devastadores por todo o mundo. Porém, esses efeitos não são sentidos da mesma forma por toda a população, pois as desigualdades regionais e sociais tendem a ser intensificadas em momentos de crise. No Brasil, as regiões mais precárias e seus grupos sociais vulneráveis sentem de forma mais intensa os impactos provocados pelas mudanças necessárias à prevenção e ao enfrentamento dos riscos produzidos pela pandemia. Este artigo busca refletir sobre os principais impactos do distanciamento social decorrentes da pandemia da Covid-19 no cotidiano dos/as integrantes das comunidades universitárias do Nordeste brasileiro. A análise e discussão são provenientes de uma pesquisa de abordagem quali-quantitativa, cujos dados foram gerados através de um formulário digital respondido por integrantes dessas comunidades de todos os estados que compõem essa região. As questões buscaram apreender as principais prevalências entre os aspectos que integram algumas das diferentes dimensões afetadas pelo protocolo de distanciamento social, como a econômica, cultural, social e emocional. Os resultados alcançados indicam que as necessidades de adaptabilidade pelas situações adversas que se apresentam sobre as vidas da população em geral encontram condições desiguais de adesão entre os integrantes das comunidades acadêmicas, refletindo-se sobre as tensões que envolvem a conciliação das rotinas pessoais e institucionais, bem como sobre os anseios em um cenário de incertezas com relação às possibilidades de sobrevivência e de enfraquecimento das Instituições às quais esses indivíduos se vinculam.
Analysis of the kefir and koumiss microbiota with the focus on certain functional properties of selected lactic acid bacteria
Authors:   Selcuk University, Veterinary Faculty, Food Hygiene and Technology Department, 42130 Konya, Turkey mail, Yusuf Biçer
Published: March 2021

The aim of this research was to determine the microbiota of commercial kefir, koumiss and homemade kefir samples using metagenomic analysis and compare some probiotic properties of lactic acid bacteria isolated from these beverages and Lactobacillus casei, used in yakult production. One koumiss, 5 commercially available kefir beverages with different brands, and 1 homemade kefir were used as samples. Microbial diversity of kefir and koumiss samples were determined by metagenomic analysis, targeting V1-V2 region of 16S rRNA gene. Streptococcus thermophilus and Lactococcus lactis were detected as dominant in direct DNA isolation from commercially available kefir beverages. Lc. lactis and Leuconostoc mesenteroides were dominant in MRS agars, and Lc. lactis were dominant in M17 agars. In kefir beverages produced by kefir grains, Lb. kefiranofaciens was determined as the dominant bacteria. Lb. kefiri and Enterococcus durans were found dominant in MRS and M17 agars respectively. Lb. kefiranofaciens, Lb. kefiri, and Str. thermophilus were the dominant bacterias of koumiss beverages. Microorganisms isolated from kefir and koumiss beverages were found to exhibit basic probiotic properties, similar to the lactic acid bacteria isolated from yakult. This research presented bacterial microflora and probiotic properties of lactic acid bacteria isolated from kefir and koumiss beverages consumed in Turkey.
Effect of ruminal mechanical stimulating brushes on the performance of lactating Holstein dairy cows
Authors:   Institute of Animal Science, 815, 104 00 Prague - Uhrineves, Czech Republic, Loucka Radko
Published: March 2021

The aim of this study was to confirm the hypothesis that artificial brushes administered to the rumen can partially replace the function of structural fibre, and increase milk production or quality. To mitigate the risks of feeding low levels of physically effective neutral detergent fibre (peNDF) to cattle, the administration of ruminal mechanical stimulating (RMS) brushes was examined in 22 high-yielding lactating Holstein dairy cows. The cows were divided into an experimental group equipped with RMS brushes and a control group without RMS. Cows were fed four experimental total mixed rations (TMR) consisting of fixed amounts of alfalfa silage, maize silage, rush corn cob mix silage and different proportions of brewer's grains, concentrate and wheat straw. The TMRs had the following 4 peNDF contents: 10.9%. 13.0%, 12.6% and 14.0%. The duration of the experiment was 18 weeks. All cows were fed TMRs with a low structural fibre content near levels associated with a risk of subacute ruminal acidosis (SARA). For the RMS brush group, 3 RMS brushes were inserted orally into the rumen using a special applicator. The effects of RMS brushes on feed intake, rumen fermentation and milk production were evaluated. Ruminal fluid (250 mL) was taken using a stomach tube for pH, volatile fatty acids and ammonia nitrogen analysis. A significant increase was found for the feed intake and milk yield of the RMS group fed the TMRs with 13.0% peNDF although no relationship between peNDF content and RMS TMRs was found. No significant increase in milk quality, rumen pH or rumen fermentation metabolites was declared for the group with RMS brushes. Although RMS brush technology only partially reduced the requirements for peNDF, it may decrease the risk of SARA.
Roberto Melaragno's scientific contributions to Brazilian Neurology
Authors: Limongi João Carlos Papaterra , Lima Plinio Marcos Garcia , Silva Sonia Maria César de Azevedo , Ferreira Matheus Gomes , Barbosa Egberto Reis , Teive Hélio Afonso Ghizoni
Published: March 2021

ABSTRACT Roberto Melaragno Filho, an associate professor of neurology at the School of Medicine of Universidade de São Paulo and head of the neurology service at Hospital do Servidor Público Estadual Francisco Morato Oliveira (HSPE-FMO), had a significant scientific career. He is recognized as a reference in the 20th century Brazilian neurology in addition to having a notable international career.
Meanings of intrafamily violence experienced in childhood/adolescence present in the discourses of men
Authors: Magalhães Júlia Renata Fernandes de , Pereira Álvaro , Gomes Nadirlene Pereira , Silva Andrey Ferreira da , Estrela Fernanda Matheus , Oliveira Milena Arão da Silva , Cruz Moniky Araújo da
Published: March 2021

ABSTRACT Objective: to unveil the meanings of intrafamily violence experienced in childhood and/or adolescence by men under legal proceedings due to conjugal violence. Method: a qualitative research, based on Thematic Oral History and supported by Symbolic Interactionism. Participants were men under legal proceedings due to domestic violence who had experienced or witnessed intrafamily violence in childhood and/or adolescence. Results: the speeches revealed that the intrafamily violence experienced in childhood and/or adolescence was signified as an educational method. The aggressions committed by parents were only perceived as acts of violence in situations considered extreme, such as in cases of using a firearm, handcuffs, and rope. Final considerations: considering that the meanings direct human conduct and that they are subject to modification depending on social interactions built throughout life, it is believed that educational strategies that encourage the redefinition of violence can be effective in facing this problem.
Potential neuroprotective of trans-resveratrol a promising agent tempeh and soybean seed coats-derived against beta-amyloid neurotoxicity on primary culture of nerve cells induced by 2-methoxyethanol
Authors: Irnidayanti Y. , Sutiono D. R. , Ibrahim N. , Wisnuwardhani P. H. , Santoso A.
Published: March 2021

Abstract Resveratrol, a natural polyphenol found in tempeh, has not been investigated especially in vitro as a neuroprotective agent against 2-methoxyethanol (2-ME)-induced beta-amyloid cytotoxicity. Beta amyloid peptides (Aβ) could initiate neurotoxic events and neuron-inflammatory response via microglial activation. However, it remains unknown whether the neurotoxic effect of beta-amyloid and/or associated with the potential of 2-ME to induce neurotoxic effects on primary culture of nerve cells induced by 2-ME. This study investigated potential neuroprotective of trans-resveratrol a promising agent tempeh and soybean seed coats-derived against beta-amyloid cytotoxicity on primary culture of nerve cells induced by 2-methoxyethanol. Biotium and MTT assays were used to analyze neurons, which were isolated from the cerebral cortex of fetal mice at gestation day 19 (GD-19). A standard solution of 2-methoxyethanol was dosed at 10 μL. The cultured cells were randomly divided into the following groups: (1) 2-ME group + resveratrol standard, (2) 2-ME group + resveratrol isolated from tempeh, (3) 2-ME group + resveratrol isolated from soybean seed coats, and (4) the control group, without the addition of either 2-ME or resveratrol. Exposure of the primary cortical neuron cells to beta-amyloid monoclonal antibody pre-incubated for 24 h with 10 µL of 4.2 µg/mL resveratrol and 7.5 mmol/l 2-methoxy-ethanol additions. Here, we report that the addition of 2-ME and resveratrol (standard and isolated from tempeh) of cell culture at concentrations of 1.4, 2.8 and 4.2 µg/mL showed that the majority of neurons grew well. In contrast, after exposure to 2-ME and Beta-amyloid, showed that glial activated. These findings demonstrate a role for resveratrol in neuroprotective-neurorescuing action.
Gender Differences in Mental Health and Beliefs about Covid-19 among Elderly Internet Users
Authors: Ferreira Heloísa Gonçalves
Published: March 2021

Abstract Older people’s mental health is at risk during the Covid-19 pandemic. This study investigated gender differences in home isolation, beliefs about Covid-19 and mental health indicators among elderly internet users during the pandemic. A total of 384 older persons (66.9% women and 30.1% men) answered an online survey devised to collect information on sociodemographic characteristics, beliefs/attitudes about Covid-19, depression (PHQ-2), loneliness (short version of the UCLA-BR), social support and resilience (the BRS). Older women showed poorer mental health indicators, were more likely to adhere to home isolation and believe in the effectiveness of this measure, and felt more self-confident to self-isolate at home. Stronger perceived vulnerability to Covid-19 and awareness of the gravity of the disease were related to poorer mental health indicators among women. Older women are a high-risk group for negative mental health outcomes during the pandemic and should therefore be a primary focus of actions to mitigate the effects of the pandemic on mental health.
Modelagem de Equações Estruturais e os testes de seleção – Caso do vestibular da Universidade Estadual do Ceará
Authors: Maia José Leudo , Lima Marcos Antonio Martins
Published: March 2021

Resumo Este estudo teve como objetivo fazer uso da Modelagem de Equações Estruturais – MEE, para avaliar a qualidade do modelo empregado pela Universidade Estadual do Ceará (UECE), no processo de seleção de seus vestibulandos, o qual é baseado na Teoria Clássica dos Testes (TCT), assim como propor ajuste a esse modelo pelo uso da Análise Fatorial de Segunda Ordem e da Análise de Regressão, via MEE. Utilizou-se um banco de dados composto dos resultados das provas de 11.060 candidatos ao vestibular de 2018.1, cujo tratamento se deu por meio do software IBM SPSS Amos (2013, v.22), obtendo-se os seguintes indicadores de qualidade: CFI ( Comparative Fit Index ) = 0,925; GFI ( Goodness-of-fit Index ) = 0,965; TLI ( Tucker Lewis Index ) = 0,922, e RMSEA ( Root Mean Square Error of Aproximation ) = 0,019. Juntos, esses indicadores demonstraram que o modelo é robusto e bastante consistente, apresentando um R 2 (Coeficiente de Correlação de Pearson ) = 0,965, indicando que a proporção das covariâncias observadas entre as variáveis manifestas e explicada pelo modelo ajustado é bastante significativa. Todas as variáveis do modelo ajustado apresentaram elevados coeficientes de regressão com valores entre 0,87 e 0,99, permitindo uma boa discriminação entre as notas dos vestibulandos, principalmente aqueles com o mesmo número de questões respondidas corretamente.
Work-life balance in Higher Education: a systematic review of the impact on the well-being of teachers
Authors: Franco Luciane Silva , Picinin Claudia Tania , Pilatti Luiz Alberto , Franco Antonio Carlos
Published: March 2021

Abstract The work-life balance needs to be exercised by individuals who perform functions in the fields of work and family, including Higher Education teachers. The purpose of this paper is to analyze the work-life balance in Higher Education and the impact on the well-being of teachers. Based on a systematic review of 53 articles retrieved from the ScienceDirect, Scopus and Web of Science from 2005 to 2020, this article has a rigorous systematic review methodology using the Mendeley and EndNote software tools. The VOSviewer and Microsoft Excel software tools were also used in the following techniques: citation analysis and co-ocurrence of terms/words. In addition, main topics discussed about the work-life balance among Higher Education teachers, research areas, field of activity and SWOT analysis (opportunities, threats, strengths and weaknesses) were identified in the literature. Findings suggest that gender inequality, stress level at work and the absence of a healthy workplace impact on the work-life balance and consequently on the well-being of Higher Education teachers.
Currículo, poder e a política do livro didático de geografia no Brasil
Authors: Vitiello Márcio Abondanza , Cacete Núria Hanglei
Published: March 2021

RESUMO Neste terceiro decênio do século XXI, período no qual ações neoconservadoras buscam eufemizar, distorcer e invisibilizar temas sociais, políticos, econômicos e culturais, as discussões sobre currículo escolar e políticas públicas educacionais tornam-se centrais. Inicialmente, promovemos uma análise da relação entre currículo e poder, no qual diferentes atores exprimem suas intencionalidades, sobrelevando alguns temas e subjazendo outros. Em seguida, abordamos o papel do livro didático no currículo escolar, especialmente no âmbito do ensino de Geografia, em uma perspectiva que ora relativiza, ora prioriza o uso desses manuais nos processos de ensino e aprendizagem. Por fim, buscamos compreender as políticas públicas relativas ao livro didático e as recentes ações no campo do currículo, consubstanciadas na Base Nacional Comum Curricular (BNCC) e na Reforma do Ensino Médio.
Situation of and phenotypic markers of susceptibility to helminth infection among sheep on farms in the Brazilian cerrado biome
Authors: Moreira Roberta Tavares , Mota Ana Lourdes Arrais de Alencar , Gonçalves Vitor Salvador Picão , Rocha Gino Chaves da , Borges José Renato Junqueira
Published: March 2021

Abstract This study aimed to determine the intensity, seasonality, and distribution by genera of, as well as to identify phenotypic markers of susceptibility to, gastrointestinal parasites among sheep on farms within the Brazilian savanna (cerrado) biome. We evaluated 1271 sheep, on seven farms, during the rainy season (in December 2017 and December 2018) and dry season (in July 2018 and July 2019). Parasitological evaluation was based on culture and EPG. We calculated hematocrit, as well as the body condition score and feces score. Of the sheep evaluated, 34.15% had moderate-to-severe parasitic infection. The factors of herds’ phenotypic characterization about helminth infections were (p ≤ 0.05 for all): anemia (OR = 5.72); leanness (OR = 1.80); loose stools or diarrhea (OR = 1.54); breed other than Santa Inês (OR = 2.31); “weaned lamb” category (OR = 4.76); “lambing ewe” category (OR = 4.66); and dry season (OR = 2.37). Haemonchus, Trichostrongylus, Oesophagostomum, and Cooperia accounted for 76.40%, 20.23%, 2.89%, and 0.47%, respectively, of the helminth genera identified, with their proportional distributions being comparable between the rainy and dry seasons. Changes in health management, with regard to helminth infection control, are urgently needed in order to combat the disease more effectively and sustainably.
A decapitação de Holofernes e as revoltas dos Macabeus: tradução alipogramática do Livro IX da De aetatibus mundi et hominis de Fulgêncio, o Mitógrafo
Authors: Santos Júnior Cristóvão José dos
Published: March 2021

Neste trabalho, realiza-se a primeira tradução alipogramática para a língua portuguesa do Livro IX da obra De aetatibus mundi et hominis, considerada o mais antigo lipograma que o passado nos legou. Esse escrito é atribuído ao compositor africano e tardio Fulgêncio, o Mitógrafo, que teria vivido entre os séculos V e VI d.C. A De aetatibus encerra uma constrição linguística de caráter consecutivo, de modo que, em cada uma de suas 14 seções, é evitada uma determinada letra. No nono Livro, ora traduzido, Fulgêncio apresenta personagens como Jezabel, Manassés, Nabucodonosor, Nebuzaradã e Mordecai, fazendo referência a algumas narrativas cristãs, com destaque para o episódio da decapitação de Holofernes por Judite. Ocorre que Fulgêncio, visando a empreender seu lipograma, não emprega unidades lexicais que apresentem o grafema ‘i’, que é exatamente a oitava letra de seu alfabeto. Note-se, por fim, que esse feito não foi cultivado no texto de chegada, na medida em que, neste momento, busca-se fornecer uma tradução que propicie um acesso mais fluido ao conteúdo temático do texto latino.