bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamics for a non-autonomous fall armyworm-maize interaction model with a saturation functional response
Authors: Daudi Salamida ,   School of Computational and Communication Science and Engineering, The Nelson Mandela African Institution of Science and Technology (NM-AIST), P. O. Box 447, Arusha, Tanzania, Luboobi Livingstone , Kgosimore Moatlhodi , Kuznetsov Dmitry ,   Department of Mathematics, Humanities and Social Science (MHSS), National Institute of Transport (NIT), P.O. Box 705, Dar-es-Salaam, Tanzania,   Department of Mathematics, Makerere University, P.O. Box 7062, Kampala, Uganda,   Department of Biometry and Mathematics, Botswana University of Agriculture and Natural Resources, Private Bag 0027, Gaborone, Botswana
Published: November 2021

In this study, we present a non-autonomous model with a Holling type II functional response, to study the complex dynamics for fall armyworm-maize biomass interacting in a periodic environment. Understanding how seasonal variations affect fall armyworm-maize dynamics is critical since maize is one of the most important cereals globally. Firstly, we study the dynamical behaviours of the basic model; that is, we investigate positive invariance, boundedness, permanence, global stability and non-persistence. We then extended the model to incorporate time dependent controls. We investigate the impact of reducing fall armyworm egg and larvae population, at minimal cost, through traditional methods and use of chemical insecticides. We noted that seasonal variations play a significant role on the patterns for all fall armyworm populations (egg, larvae, pupae and moth). We also noted that in all scenarios, the optimal control can greatly reduce the sizes of fall armyworm populations and in some scenarios, total elimination may be attained. The modeling approach presented here provides a framework for designing effective control strategies to manage the fall armyworm during outbreaks.
Estime de soi, sentiment d’autoefficacité et intention de décrocher au collégial
Authors: Thibodeau Stéphane , Giguère Elisabeth , Lefebvre Sonia , Frenette Éric
Published: November 2021

Depuis plusieurs années, la province de Québec se mobilise afin de lutter contre le décrochage scolaire. Par les nombreuses répercussions négatives qu’il engendre tant sur le plan individuel que sociétal, ce phénomène grandissant demeure un enjeu de premier plan. Le but de la présente étude est de mettre en lumière des facteurs personnels sous-jacents au décrochage scolaire. Plus précisément, son objectif consiste à explorer les relations entre l’estime de soi et l’intention de décrocher d’étudiants du collégial, de même que d’identifier le rôle du sentiment d’autoefficacité dans ces relations. Trois cent quatre-vingt-onze (391) étudiants, provenant de trois établissements collégiaux (deux publics et un privé), ont participé à la recherche. La version canadienne française de Bouffard et al. (2002) du Self-Perception Profil for Adolescents (SPPA, Harter, 1988), l’adaptation réalisée pour des adolescents par Suldo et Shaffer (2007) du Self-Efficacy Questionnaire for Children (SEQ-C, Muris, 2001) ainsi que la traduction des trois énoncés que proposent Hardre et Reeve (2003) permettent de mesurer, respectivement, l’estime de soi, le sentiment d’autoefficacité et l’intention de décrocher. Les résultats montrent que l’estime de soi et le sentiment d’efficacité des étudiants du collégial présentent des corrélations négatives avec l’intention de décrocher. Plus précisément, l’analyse acheminatoire présente des statistiques d’ajustement adéquates du modèle aux données. Elle révèle l’existence de liens indirects entre l’estime de soi et l’intention de décrocher, de même que le rôle d’intermédiaire du sentiment d’autoefficacité dans ces relations. Ces résultats sont discutés à la lumière des théories sous-jacentes ainsi qu’à partir d’études antérieures.
Rebeldia e mística como possibilidades para a construção da democracia em Bergson
Authors: Bonadio Gilberto Bettini
Published: November 2021

Em sua última obra, As Duas Fontes da Moral e da Religião, Henri Bergson investiga as origens, o desenvolvimento e a manutenção da sociedade humana por meio da distinção entre a sociedade fechada, baseada nos instintos primitivos de conservação da vida, e a sociedade aberta, fundada sobre a aspiração que impulsiona o homem à construção de uma vida em sociedade mais harmoniosa. Segundo o autor, os ideais democráticos são frutos da abertura de que as sociedades necessitam para seu progresso, o qual, aos poucos, abrandaria a pressão das exigências impostas pela natureza para a conservação da vida em sociedade e possibilitaria aos homens conviverem mais livremente e mais afetuosamente com vistas a uma sociedade mais justa e sem tantos conflitos e mortes. Contudo, como escapar às determinações que a natureza impôs para que a vida em sociedade se mantivesse e conseguir que os homens se abram a outro tipo de vivência em conjunto? É esta a questão que o presente artigo procura investigar.
Palavras-chave: Bergson, moral, política, mística.
On collectively assigning features to artifacts
Authors: Gouvea Rodrigo A. dos S.
Published: November 2021

The common notion of artifacts characterizes them as the products of successful activities of their makers, guided by intentions that such objects would instantiate certain features, such as their specific functions. Many counterexamples, however, reveal the unsuitability of the common notion. In the face of this acknowledgment, the paper explores the possibility that features of artifacts, and more specifically, the possession of their functions, may arise, at least partially, from collective assignments. In order to achieve the mentioned goal, the paper critically examines some notions and theses put forward by John Searle (1996; 2010) and others. Its main result, however, consists in offering and elucidating an original thesis, namely, that the functions of many artifacts would be maintained, partially, by forms of continuous collective intentionality, which can involve conscious or unconscious, active or inactive collective intentional states.
Keywords: Artifacts, assignment of function, collective intentionality, maintenance of function.
Heat Transfer Enhancement of Water Based Al2O3- Cu Hybrid Nanofluid Trough Square Cavity
Authors: Trodi Amira , Benhamza Mohamed El Hocine
Published: November 2021

The present numerical work, based on the finite volume method, deals with the characterization of natural convective flow and thermal fields inside differentially vertical heated square cavities filled with a nanofluid as well as the quantification of the convective exchanges. The investigation is devoted to study the influence of the hybrid nanofluid (Al2O3-Cu / water) on the flow’s general structure with a particular attention to the Nusselt number. An exhaustive parametric study is conducted considering different combinations of Al2O3 and Cu nanoparticles (NPs) dispersed in water for a range of Rayleigh numbers (Ra) and total volume fractions An appropriate agreement with experimental data was observed for the estimation of the hybrid nanofluid thermal conductivity. From the results, it is observed that the heat transfer intensifies by increasing the Ra number and the nanoparticles volume fraction. The hybrid nanofluid seems to be the most efficient nanofluid in comparison with a base fluid and a single nanofluid. This heat transfer enhancement becomes more convincing with the increase of the Cu NPs content (% in volume).
Mechanical Properties of Granite-Gravel Porous Concrete
Authors: Odeyemi Samson Olalekan
Published: November 2021

The need for porous concrete has become increased due its ability to control surface water, increase the rate of recharging groundwater, and reduce pollution of the ecosystem. Granite is a coarse aggregate that is quite expensive when compared with gravel in Nigeria. Therefore, this research is aimed at optimizing blended granite and gravel in the production of porous concrete. Samples of blended granite-gravel porous concrete of varying mix proportions were produced using cement to aggregate mix ratio of 1:4. The samples were tested for their porosity, workability and compressive strengths. The data collected were analyzed with the aid of Design Expert 10.0. It was observed that the optimal combination for the granite-gravel blended porous concrete is 12% granite, 88% gravel, and a water-cement ratio of 0.66%. This combination gave a porous concrete with a compressive strength of 48.4 N/mm2, percentage porosity of 6% and a compacting factor of 0.91. These values when compared to that of the control specimen revealed that the optimal mix gave a porous concrete with higher porosity, higher workability and a better compressive strength.
Experimental Study of the Mechanical Behaviour of Brick Waste Concrete and Analytical Prediction of its Elastic Modulus as a Three-Phase Composite Material
Authors: Achour Wafa Ben , El Euch Khay Saloua , Miled Karim , Neji Jamel
Published: November 2021

This paper focuses on the characterization of the mechanical behaviour of concrete incorporating different percentages of brick waste aggregates (BWA). Compressive strength, splitting tensile strength and elastic modulus of this material were measured based on standard laboratory tests and its microstructure was characterized based on scanning electron microscope (SEM) observations. A decrease in these properties was observed with the increase of BWA substitution ratio. However, this decrease remains moderate up to a substitution percentage of 30% (about 12% for compressive strength and elastic modulus and 8% for splitting-tensile strength). In addition, an increase in the concrete porosity was observed with the increase of BWA substitution ratio, which can explain the decrease observed in the measured mechanical characteristics. SEM views on concrete incorporating 100% of BWA showed that the interfacial transition zone (ITZ) and the cement paste present a higher porosity when compared to those of the reference concrete made with natural aggregates.Finally, a micromechanical analytical homogenization model predicting the elastic modulus of brick waste concrete (BWC) according to its composition is proposed where BWC is modelled as a three-phase composite. A good agreement was found between analytical predictions and experimental results proving that BWC mechanical characteristics are mainly governed by BWA mechanical properties and their volume fraction within concrete.
A Mathematical Model Development for Simulating Nitrate Pollutant Transport along a River
Authors: Olowe Kayode O. , Kumarasamy Muthukrishnavellaisamy
Published: November 2021

Contamination of surface water bodies by a wide range of organic and inorganic pollutants has been a serious problem in the recent time, these have an effect on human and aquatic animals. The water quality deterioration calls for regular monitoring of the water quality in order to maintain the health and sustainability of the aquatic ecosystems. Accurate monitoring of discharged pollutants into the rivers may be time taking and labour intensive. Water quality models are significant tools for simulating water quality and controlling the surface water pollution. The purpose of this study is to develop a simplified mathematical model which is hybrid cells in series model (HCIS) to simulate the spatial and temporal variation of nitrate concentration in natural rivers. The HCIS model was formulated to serve as an alternative method to the Fickian based models. Analytical solutions for the first order reaction kinetics of nitrate with the advection and dispersion process were derived using Laplace transformation technique. The model considered the effect of nitrate concentration at several points along the river downstream by considering the transformation of nitrite to nitrate through nitrification process. In addition, the uptake of nitrate by algae for its growth and conversion of nitrate to nitrogen gas due to denitrification process were considered. The HCIS-NO3 model was applied to uMgeni River, South Africa to investigate the nitrate concentration along the river. Furthermore, the quantitative measures based on the coefficient of determination (R2) and standard errors (SE) were used to evaluate the performance of the model. The result shows that the simulated values agreed with the measured values of nitrate concentration in the river which resulted in a R2 value of 0.72 and a low standard error. Analytical solutions of HCIS - NO3 model were compared with the numerical solutions of the Fickian based ADE model for hypothetical problems. Comparison of the responses indicates that the HCIS - NO3 and ADE- NO3 models were in good agreement. The study shows that the hybrid model is a simple and effective tool for simulating pollutant transport in natural rivers.
Design and Simulation of an Off-Grid Photovoltaic System with Duty Cycle Prediction Using Neural Network Controller
Authors: Zungeru Adamu Murtala , Duncan Dauda , Diarra Bakary , Chuma Joseph , Mosalaosi Modisa , Mtengi Bokani , Gaboitaolelwe Jwaone , Lebekwe Caspar
Published: November 2021

Global concerns over the inappropriate utilization of abundant renewable energy sources, the damages due to instability of fuel prices, and fossil fuels' effect on the environment have led to an increased interest in green energy (natural power generation) from renewable sources. In renewable energy, photovoltaic is relatively the dominant technique and exhibits non-linearities, leading to inefficiencies. Maximum Power Point is required to be tracked rapidly and improve the power output levels. The target is to use a Neural network controller by training historical data of ambient irradiance and temperature levels as inputs and voltage levels as output for the photovoltaic module to predict duty cycles across the DC-DC converter. The DC-DC converter is the electrical power conditioner at the Botswana International University of Science and Technology, Palapye Off-Grid photovoltaic system. Perturb and Observe algorithm on PSIM environment is only implemented to acquire the historical data for the training and Matlab for the modeling of the network. Relatively long period ambient irradiance and temperature data of Palapye were acquired from the Southern African Science Service Centre for Climate Change and Adaptive Land Management (SASSCAL) WeatherNet in Botswana. Matlab environment was used for the simulation of the backpropagation algorithm for training. The Neural network's feedforward to optimize the non-linear nature of the PV module input and output relationship with relatively fewer processes is required. The results show promising, and the Mean Errors appear to be typically about 0.1 V, and the best performance is 193.5812 at Epoch 13, while the regression delivered a relatively low measured error. The maximum power delivered by the duty cycles from the model with 90 % prediction accuracy. The article demonstrates Neural Network controller is more efficient than the conventional Perturb and Observe Maximum Power Point algorithm.
Numerical Simulation of Stress Relaxation and Creep Response of X20 Steam Piping under Diverse Operating Conditions
Authors: Salifu Smith , Desai Dawood A. , Kok Schalk
Published: November 2021

The creep response and stress relaxation of X20 CrMoV12-1 steam piping under diverse operating conditions were simulated using finite element analysis (FEA) code, Abaqus alongside fe-safe/Turbolife software. In the study, steady-state creep and creep analysis characterized by 24 hours daily cycle consisting of a total of 6 hours peak, 4 hours transient and 14 hours off-peak period was considered. Modified hyperbolic sine creep model used in the analysis was implemented in Abaqus via a special creep user-subroutine to compute the stress relaxation and creep behaviour, while the useful service life and creep damage was estimated using fe-safe/Turbolife. The optimum creep strain, stress, damage, and worst life were found at the intrados of the piping, with the steady-state analysis having a higher useful creep life and slower creep damage accumulation. Furthermore, slower stress relaxation with faster damage accumulation was observed in the analysis involving cycles. Finally, a good agreement was obtained between the analytical calculated and simulated rates of the piping.
The Effect of Boundary Conditions and Stacking Sequence on the Nonlinear Behavior of Laminated Composite Plates in Bending
Authors: Bellahkim Mouad , Benbouras Youssef , Maziri Aziz , Mallil El Hassan , Echaabi Jamal
Published: November 2021

This paper presents an effectively numerical approach based on quadrilateral isoperimetric element. Indeed, the Von-Karman’s large deflection theory and the first-order shear deformation theory (FSDT) are also used in the formulation of the element to formulate the geometrically nonlinearity analysis. The nonlinear finite element code has been developed by using Matlab. Therefore, the governing nonlinear equations obtained are solved using Newton–Raphson iterative technique. Finally, the results obtained are compared with those available in the literature and with those obtained by ABAQUS. It has been found that the present approach is accurate and efficient to predict the nonlinear behavior of laminated composite plates under bending loads. Moreover, the effects of the boundary conditions and the stacking sequence on the nonlinear deflection of the plate are treated.
Analysis and Numerical Simulation of no Reacting Swirling Flow by Using URANS Approach
Authors: Habib Merouane , Mohammed Senouci
Published: November 2021

In this paper, we investigate the no-reacting swirling flow by using the numerical simulation based to the unsteady Reynolds-averaged Navier-Stokes approach. The numerical simulation was realized by using a computational fluid dynamics CFD code. The governing equations are solved by using the finite volume method with two classical models of turbulence K-epsilon and Shear Stress K-ω. The objective of this paper is therefore to evaluate the performance of the two models in predicting the recirculation zones in a swirled turbulent flow. The current models are validated by comparing the numerical results of the axial, radial and tangential velocities to the experimental data from literature.
Dredged Dam Raw Sediments Geotechnical Characterization for Beneficial Use in Road Construction
Authors: Larouci Abdelkader , Senhadji Yassine , Laoufi Laid , Benazzouk Amar
Published: November 2021

The present research work aims to evaluate the feasibility of reusing raw dredged sediments from the Dam of Fergoug (northwestern Algeria) as an alternative material for road construction. These sediments were added to volcanic tuff from the quarry located near the village of Sidi Ali Cherif, in the town of Sig (northwestern Algeria), with contents of 5, 10, 15, 20 and 25% by total weight of tuff. To achieve this goal, sediments were extracted from Fergoug dam and an experimental program was carried out to study the possibility of valorizing these sediments to be used in road construction. The soils were subjected to a series of physical and chemical tests. Their physical properties, including the Atterberg limits, specific gravity, grain size distribution, and organic content were determined according to standard methods. Then, their chemical properties, including pH, elementary chemical composition using the X-ray fluorescence spectrometry and mineralogical composition identified by X-ray diffraction, were obtained by means of standard methods. The first experimental results from the tested formulations demonstrated the feasibility of reusing the valorized dredged sediments in road construction. Afterwards, the modified Proctor and ICBR tests were carried out, and the results obtained turned out to be quite satisfactory.
General principles of the physiotherapy treatment of diseases of the heart
Authors: Blair Jean
Published: November 2021

No abstract available.
Sperm flagellar 2 (SPEF2) is essential for sperm flagellar assembly in humans
Authors: Li Dong-Yan , Yang Xiao-Xuan , Tu Chao-Feng , Wang Wei-Li , Meng Lan-Lan , Lu Guang-Xiu , Tan Yue-Qiu , Zhang Qian-Jun , Du Juan
Published: November 2021

Spermiogenesis is a complex and tightly regulated process, consisting of acrosomal biogenesis, condensation of chromatin, flagellar assembly, and disposal of extra cytoplasm. Previous studies have reported that sperm flagellar 2 (SPEF2) deficiency causes severe asthenoteratozoospermia owing to spermiogenesis failure, but the underlying molecular mechanism in humans remains unclear. Here, we performed proteomic analysis on spermatozoa from threeSPEF2mutant patients to study the functional role of SPEF2 during sperm tail development. A total of 1262 differentially expressed proteins were detected, including 486 upregulated and 776 downregulated. The constructed heat map of the differentially expressed proteins showed similar trends. Among these, the expression of proteins related to flagellar assembly, including SPEF2, sperm associated antigen 6 (SPAG6), dynein light chain tctex-type 1 (DYNLT1), radial spoke head component 1 (RSPH1), translocase of outer mitochondrial membrane 20 (TOM20), EF-hand domain containing 1 (EFHC1), meiosis-specific nuclear structural 1 (MNS1) and intraflagellar transport 20 (IFT20), was verified by western blot. Functional clustering analysis indicated that these differentially expressed proteins were specifically enriched for terms such as spermatid development and flagellar assembly. Furthermore, we showed that SPEF2 interacts with radial spoke head component 9 (RSPH9) and IFT20in vitro, which are well-studied components of radial spokes or intra-flagellar transport and are essential for flagellar assembly. These results provide a rich resource for further investigation into the molecular mechanism underlying the role that SPEF2 plays in sperm tail development and could provide a theoretical basis for gene therapy inSPEF2mutant patients in the future.
Harmonic Scalpel Hemorrhoidectomy Versus Bipolar Diathermy Hemorrhoidectomy – A Prospective Evaluation
Authors: Ul Bari Shams , Malik Ajaz Ahmad , Kangoo Abid Aziz
Published: November 2021

Background

Hemorrhoidal disease is a very common anorectal disorder occurring more frequently in individuals who are older than 40 years. Although early-stage diseases can be managed conservatively, late-stage diseases usually need surgical treatment.

Aims and Objectives

The aim of the study was to compare harmonic scalpel hemorrhoidectomy with bipolar diathermy hemorrhoidectomy in terms of operative time, intraoperative bleeding, hospital stay, pain expectation score, time to start normal activity, and complications if any.

Materials and Methods

The study entitled, "Harmonic scalpel hemorrhoidectomy versus bipolar diathermy hemorrhoidectomy-A prospective evaluation" was conducted in the Department of General and Minimal invasive Surgery SKIMS and SKIMS Medical College Srinagar from July 2017 to June 2019. The study was performed on all patients with Grade 3 and Grade 4 hemorrhoids. The total number of patients studied was 64, who were randomly subjected either to the harmonic scalpel hemorrhoidectomy or to bipolar diathermy hemorrhoidectomy.

Results

Thirty-one patients were subjected to harmonic scalpel hemorrhoidectomy and 33 patients were subjected to bipolar diathermy hemorrhoidectomy. Mean operative time and intraoperative bleeding were significantly less in harmonic scalpel hemorrhoidectomy as compared to that of bipolar hemorrhoidectomy. The patients who underwent harmonic scalpel hemorrhoidectomy experienced significantly less pain and had significantly shorter hospital stay and early return to routine work in contrast to bipolar diathermy hemorrhoidectomy.

Conclusion

Harmonic scalpel hemorrhoidectomy is recommended in patients with symptomatic Grade 3 internal hemorrhoids in association with large external components and those with Grade 4 hemorrhoids.
Comparison of cold snare polypectomy and endoscopic mucosal resection for 3–10-mm colorectal polyps in end-stage renal disease patients
Authors: Oh Chang Kyo , Choi Ho Soon , Cho Young-Seok
Published: November 2021

Background:

Patients with end-stage renal disease (ESRD) have a higher incidence of clinically relevant complications, such as bleeding and perforation after polyp resection, compared to patients without underlying diseases. Cold snare polypectomy (CSP) is increasingly used for the removal of small polyps and diminutive polyps due to its shorter procedure time and low risk of bleeding and perforation. However, there have been few studies on the effectiveness and safety of CSP in patients with ESRD. The aim of this study was to compare the efficacy and safety of CSP and endoscopic mucosal resection (EMR) in ESRD patients.

Methods:

This study was a retrospective study. We performed propensity score-matched analysis in patients with ESRD who underwent endoscopic resection for 3–10-mm-sized colorectal polyps at Seoul St. Mary's Hospital, from January 2014 to December 2019.

Results:

After 1:1 ratio matching, 406 polyps were included: 203 polyps were resected with CSP and 203 polyps with EMR. There was no difference between the CSP group and EMR group in incomplete resection rate (4.43% vs. 1.97%, P = 0.16). There were no differences between the CSP and EMR group for immediate bleeding (5.42% vs. 7.88%, P = 0.32) and delayed bleeding (0% vs. 0.49%, P = 1.00). No perforation occurred in either group.

Conclusions:

There were no differences between the CSP and EMR group in terms of efficacy and safety. CSP can be one of the standard methods for the removal of 3–10-mm-sized colorectal polyps in patients with ESRD.
Modelling the episodes of care for iron deficiency anemia patients in a secondary-care center using continuous-time multistate Markov chain
Authors: Almilaji Orouba
Published: November 2021

Background:

Despite the high prevalence of gastro-intestinal (GI) cancer in iron deficiency anemia (IDA), some IDA patients do not complete all the necessary GI investigations at the initial referral. As a result, existing cancers are diagnosed at a later referral with worse prognosis. The potential to detect GI cancer early depends on minimizing the delay time spent between the two consecutive referrals, where a patient did not complete investigations at the first referral, but at the second is diagnosed with positive GI cancer. This retrospective longitudinal study aims to highlight the proper methods to model these referrals.

Methods:

Using anonymized data of 168 episodes of care for IDA patients at an IDA clinic in a secondary care setting, continuous-time multi-state Markov chain is employed to determine the transition rates among three observed states for IDA patients at the IDA clinic, “incomplete investigations,” “negative GI cancer,” and “positive GI cancer” and to estimate the delay time.

Results:

Once in the state of incomplete investigations, an estimated mean delay time of 3.1 years (95% CI: 1.2, 5) is spent before being diagnosed with positive GI cancer. The probability that a “positive GI diagnosis” is next after the state of “incomplete investigation” is 17%, compared with 11% when it is followed in the state of negative GI cancer. Defining the survival as the event of not being in the state of “positive GI cancer,” the survival rate of IDA patients with negative GI cancer is always higher than those with incomplete investigations. Finally, being diagnosed with positive GI cancer is always preceded by the prediction of being considered “very high risk” at the earlier visit.

Conclusion:

A baseline model was proposed to represent episodes of care for IDA patients at a secondary care center. Preliminary results highlight the importance of completing the GI investigations, especially in IDA patients, who are at high risk of GI cancer and fit to go through the investigations.
Small Data Global Well-Posedness and Scattering for the Inhomogeneous Nonlinear Schrödinger Equation in $H^s(\mathbb{R}^n)$
Authors: An JinMyong , Kim JinMyong
Published: November 2021

We consider the Cauchy problem for the inhomogeneous nonlinear Schrödinger (INLS) equation

iu_t +\Delta u=\lvert x\rvert^{-b} f(u),\quad u(0)=u_0 \in H^s(\mathbb{R}^n),

where

0<s<\min\{n,\frac{n}{2} +1\}

,

0<b<\min\{2,n-s,1+\frac{n-2s}{2}\}

and

f(u)

is a nonlinear function that behaves like

\lambda \lvert u\rvert^{\sigma} u

with

\lambda \in \mathbb{C}

and

\sigma >0

. We prove that the Cauchy problem of the INLS equation is globally well-posed in

H^s(\mathbb{R}^n)

if the initial data is sufficiently small and

\sigma_0 <\sigma <\sigma_s

, where

\sigma_0 =\frac{4-2b}{n}

and

\sigma_s =\frac{4-2b}{n-2s}

if

s<\frac{n}{2}

,

\sigma_s =\infty

if

s\ge \frac{n}{2}

. Our global well-posedness result improves the one of Guzmán [Nonlinear Anal. Real World Appl. 37 (2017), 249–286] by extending the validity of

s

and

b

. In addition, we also have the small data scattering result.
On the genera of polyhedral embeddings of cubic graph
Authors: Brinkmann Gunnar , Tucker Thomas , Van Cleemput Nico
Published: November 2021

In this article we present theoretical and computational results on the
existence of polyhedral embeddings of graphs. The emphasis is on cubic graphs.
We also describe an efficient algorithm to compute all polyhedral embeddings of
a given cubic graph and constructions for cubic graphs with some special
properties of their polyhedral embeddings. Some key results are that even cubic
graphs with a polyhedral embedding on the torus can also have polyhedral
embeddings in arbitrarily high genus, in fact in a genus {\em close} to the
theoretical maximum for that number of vertices, and that there is no bound on
the number of genera in which a cubic graph can have a polyhedral embedding.
While these results suggest a large variety of polyhedral embeddings,
computations for up to 28 vertices suggest that by far most of the cubic graphs
do not have a polyhedral embedding in any genus and that the ratio of these
graphs is increasing with the number of vertices.
Review of Margaret Schabas and Carl Wennerlind, A Philosopher's Economist: Hume and the Rise of Capitalism
Authors: Cernea Mihail-Valentin
Published: November 2021

Margaret Schabas and Carl Wennerlind, A Philosopher's Economist: Hume and the Rise of Capitalism, Chicago IL, University of Chicago Press, 316 p., e-book
Métodos de treinamento de força para nadadores
Authors: Magalhães Ramon Mendes da Costa
Published: November 2021

O treinamento de força (TF) possibilita aos nadadores ganhos de força e potência muscular. Entretanto, a forma como o TF é utilizado nas fases da periodização se apresenta de maneira diversa na literatura. Assim sendo, o presente estudo pretende identificar as diferentes metodologias de treinamento de força utilizadas pelos treinadores de natação, coligando sua aplicabilidade em cada fase ou período da temporada. Dezesseis técnicos de natação participantes do XXX Campeonato Brasileiro Júnior de Natação responderam um questionário sobre os métodos de TF utilizados no treinamento de seus atletas. O TF é mais utilizado nos períodos básicos e específicos, com ênfase no desenvolvimento das forças máximas e de resistência. Nos períodos competitivo e polimento, a ênfase se dá no desenvolvimento da força explosiva. A maioria dos treinadores relatou utilizar o TF de forma específica (na água) e inespecífico (na terra), utilizando os mais variados equipamentos e métodos, com frequência semanal de 3 a 4 vezes. Os técnicos consideraram o TF importante para o desempenho final dos seus atletas. O presente estudo concluiu que o TF realizado pelos técnicos do estudo, apresentam singularidades e divergências com a literatura especializada.
Autopsia médico legal: asfixia mecánica por ahorcadura versus asfixia mecánica por estrangulación
Authors: Garcia Gutierrez Lady Guadalupe
Published: November 2021

RESUMEN
Para describir los signos que se pueden encontrar en una autopsia, cuya causa demuerte es asfixia por ahorcadura o por estrangulamiento; se desarrolló esta revisiónteórica, en la que se incluyeron 26 publicaciones, desde 2010 hasta la actualidad. Elahorcamiento, es una de las principales formas de suicidio, más frecuente entre loshombres; mientras que el estrangulamiento, ocurre más entre las mujeres; y su victimario suele tener vínculos amorosos o familiares con esta. El conocimiento de los signosexternos e internos en ambas causas de muerte, resulta de vital importancia para elmédico forense.
KARAKTERISTIK BUDAYA MASYARAKAT KAMPUNG BAHARI KOTA BENGKULU
Authors: Rafinita Aditia
Published: November 2021

Artikel ini membahas tentang bagaimana karakteristik budaya masyarakat Kampung Bahari Kota Bengkulu. Pendekatan yang digunakan dalam penelitian ini adalah pendekatan kualitatif dengan jenis penelitian studi kasus. Penelitian yang dilakukan mengambil lokasi di RT 13 Kampung Bahari Kota Bengkulu. Informan dalam penelitian ini diambil menjadi 2 informan, yaitu key informan (informan kunci) dan informan pendukung. Data yang diperoleh dari penelitian ini diuraikan, dianalisis dan dibahas secara deskriptif kualitatif.  Hasil penelitian ini menemukan bahwa kondisi agama, sosial, dan pendidikan suatu masyarakat akan menentukan bagaiamana karakteristik budaya yang ada. Kondisi agama di Kampung Bahari  masih sangat baik dilihat dari Mayoritas masyarakat di Kampung Bahari yang beragama islam. Dalam hubungan sosial antar masyarakat serta pendidikan pada di Kampung Bahari juga telah masuk pada kategori yang baik sehingga budaya yang terbentuk di Kampung Bahari menjadi baik pula.
Presenting a Favorable Model for Implementing the Cultural Policies of the Higher Education System in Line with the Cultural Policies of the Islamic Republic of Iran
Authors: Seddighi Marzieh , Salajegheh Sanjar , Kamali Mohammad Jalal , Shokouh Zahra
Published: November 2021

Higher education centers have become important social organizations that play a major role in the comprehensive and sustainable development of countries. The mission of universities as a learning organization has a great impact on micro and macro government decisions in the short and long term because the product of universities affects the knowledge, insight, characteristics and behavior of graduates as managers and current and future decision makers of the country. This research was conducted with the aim of presenting a favorable model for the implementation of cultural policies of the higher education system in line with the cultural policies of the Islamic Republic of Iran. Descriptive research method was used in this study. The statistical population of the study includes higher education staff in the southeastern provinces of the country. A questionnaire was used to collect data and SPSS software version 23 and AMOS version 23 software were used to analyze the data.
Comparative Evaluation of the Proximate and Micro-Nutritional Benefits of Pawpaw, Carrots, Turmeric and Coconut
Authors:   Department of Chemistry, University of Benin, Nigeria, Ajenu CO , Imhontu EE ,   Department of General Studies, Edo State School of Health Technology, Nigeria
Published: November 2021

Natural products are essential components in the human diet providing vital micronutrients such as vitamins (A, B, C, E) and minerals (calcium, potassium, sodium etc.) that are essential for proper growth and development as well as playing other roles in normal body function or metabolism. The aim of this study is to evaluate the proximate and micronutrient composition of some selected plant samples: pawpaw, carrots, turmeric and coconut. The proximate and micronutrient composition of the different fruits evaluation was carried out using methods. Results obtained shows that carrot have the highest moisture content of 84.1%, pawpaw have the highest fiber content of 23.8%, crude protein content of 12.8% and ash content of 9.6%. Coconuts have the highest fat content of 43.0% and the highest carbohydrate content was recorded in turmeric (68.59%). Highest vitamin C content was recorded in pawpaw 60.3 mg, while coconut have the highest zinc (8.0 mg), copper (4.2 mg) and iron (21.3 mg) content. Carrots have the highest sodium content of 84.0 mg. These fruits are cheap and rich in several micronutrients thus consuming them often will help reduce micronutrient malnutrition. They can also be processed into various forms domestically and on industrial scale for juices, soups, etc and can also be used to complement other foods to improve both nutrient and sensory attribute.
Student character value in online learning during the Covid-19 pandemic
Authors: Soenaryo Siti Fatimah , Susanti Reni Dwi , Suwandayani Beti Istanti
Published: November 2021

The purpose of this study was to find out how the student character values in learning activities carried out during the Pandemic. This research is quantitative descriptive. The data was taken using observation and questionnaires and then analyzed with quantitative methods and then described to see how the student's character was seen from the indicators of honesty, hard work, discipline, communicative and responsible. The results of the study indicate that the value of student character during online learning is seen in the indicators of responsibility and discipline. While the indicators of honesty, hard work and communicativeness do not seem to get good results.
Attitudes toward Psychological Help and Coping Behavior of Senior High School Students
Authors: Musni Ralph Vendel Emborgo
Published: November 2021

Senior High School students are further uncovered to numerous shapes of psychological trouble (i.e. enthusiastic, social and scholastic issues) that can lead to passionate precariousness and sadness (Peterson, 2002). With this situation, guidance services are regarded vital. This study seeks to investigate among senior high school students on their attitude towards psychological help and their coping behavior. The study used the descriptive survey method among the Grade-11 and 12 students in one of the Universities in Cagayan de Oro City. Finding of the study revealed that Grade 11 and Grade 12 respondents were mostly 18 years of age and dominated by males. STEM strand was the biggest in group and most respondents came from the Public schools. Of the ATSPPHS four factor measurements, Factor-3 Interpersonal Openness got the highest mean value. Factor-4 Confidence in Mental Health Professional got the lowest mean value. Thus, the Grade -11 and 12 respondents have slight tendency and somehow positive attitude to seek professional and psychological help when they are confronted with problems and issues in life. Grade-11 coping response was through listening to music while the Grade-12 students’ coping response would to apologize to people whom they have in conflict with. Moreover, the result showed no significant difference on the respondents’ attitudes toward psychological help based on the four factors of ATSPPHC. However, there was a significant difference on students’ attitude sunder HUMMS and GAS strands toward psychological help particularly on factors two and three namely: Tolerance of Stigma Associated with Psychological Help and Interpersonal Openness respectively. The study revealed that there was no significant difference on the respondents’ coping behavior and attitude towards   psychological help. It is imperative to conclude that there is a strong need to promote more awareness on the guidance related programs to encourage more Grade 11 and 12 students to trust and submit themselves for counseling whenever they face personal problems and issues in life. It therefore recommended the following: Develop a program that will address the student’s attitude and coping behavior toward seeking psychological help; Enrich the general guidance services program of the school; School personnel, teachers and counselors must undergo enrichment trainings, seminars to better understand why some students display high anxiety, fear, and depression in the campus.
Bankruptcy Prediction And Its Effect On Stock Prices As Impact Of The COVID-19 Pandemic
Authors: Kesuma Muhammad Ramadhani , Defung Felisitas , Kusumawardani Anisa
Published: November 2021

As COVID-19 pandemic hit the world since early 2020, one business sector in many countries that struggling to survive is tourism and its derivatives, such as restaurants and hotels.  This study aims to examine the accuracy of the Springate and Grover models in predicting bankruptcy, as well as the effect on stock prices of tourism, restaurant, and hotel sector in Indonesia. The results show that all sample tourism, restaurant, and hotel companies are bankrupt under the Springate model, whilst according to Grover's model the findings are varied during the study period. Furthermore, the Grover model is implied to be more accurate than the Springate model. The effect of both prediction models on stock price appears dissimilar. Springate's prediction model suggests a positive and significant effect on stock prices, whereas there is no strong evidence about the effect of Grover’s prediction model.
Assessing the reaction of the Baltic stock market to the spread of the COVID-19 pandemic
Authors: Keliuotyte-Staniuleniene Greta , Kviklis Julius
Published: November 2021

This research aims to assess the impact of the spread of the COVID-19 pandemic on the Baltic stock market. To reach this aim, the methods of bivariate (OLS) regression and VAR-based impulse response functions are employed. We use daily new cases of COVID-19 as well as the cumulative number of COVID-19 cases as independent and OMX Baltic Benchmark GI index as dependent variables for our research. The research period, covering data from 2020 March 1st  to 2020 November 21st, is divided into three separate periods, reflecting the different phases of the spread of the COVID-19 pandemic. The results of the research revealed that the market reaction differs depending on the period; moreover, the Baltic stock market index was affected by new cases and total cases in a slightly different manner.
Analysis of the structural framework for schools affected by the Sunda Strait Tsunami in Pandeglang Regency
Authors: Bohari Jazmi Adlan , Widana I Dewa Ketut Kerta , Bahar Fauzi , Widyaningrum Nrangwesthi
Published: November 2021

The Sunda Strait tsunami disaster in 2018 claimed the lives of more than 430 people and caused various damage to infrastructure in coastal areas. This disaster also had an impact on the education sector. Schools located in disaster-prone areas are vulnerable to building damage that causes casualties and psychological problems for students. The west coast of Pandeglang Regency is a tsunami-prone area and is home to hundreds of elementary and high school schools in the area. The aim of this study is to analyze of the structural framework for schools affected by the sunda strait tsunami. The research locus was determined by purposive sampling in three locations: MTs Masyariqul Anwar in Labuan, SDN Mekarjaya 3 in Panimbang, and SDN Tamanjaya 2 in Sumur. This research data analysis uses qualitative data analysis techniques by Miles, Huberman and Saldana (2014). This research used disaster school survey form issued by National Disaster Management Agency (BNPB) which regulated in Head of BNPB Regulation No. 4 of 2012 on Implementation Guidelines of Disaster Safe Schools. The research finding that MTs Masyariqul Anwar, SDN Mekarjaya 3, and SDN Tamanjaya 2 can be concluded that MTs Masyariqul Anwar and SDN Tamanjaya 2 have a good level of school security with some notes that need to be improved. Meanwhile, SDN Mekarjaya 3 has a sufficient level of school security with several factors that are so inadequate that they must be repaired and improved immediately.
An analysis of the Return on Assets of HoReCa Companies in Constanta County in the Context of the Recovery Pursuits after the Shock Produced by the COVID-19 Pandemic
Authors: Aivaz Kamer-Ainur , Căpățână Alexandru
Published: November 2021

From a microeconomic perspective, if we refer to a company as an economic agent, its organizational resilience/flexibility, in the unprecedented global economic context generated by COVID-19, is in the limelight, given that a resilient company would design and implement effective actions in order to increase the probability of its own survival. Assuming that a company's assets are those means by which a company can secure an income for a period of several years, since they are economic resources that can generate economic benefits in the future for the company that owns them, we have considered it appropriate to analyse the return on assets at the level of the companies in the HORECA sector. The comprehensive research undertaken is an empirical study in which we have analysed all the companies in the HORECA sector on the territory of Constanta County, located in the coastal area of the Black Sea, for a period of 3 years, 2018-2020, a period which includes the year of the onset of the SARS-COVID-19 pandemic. The selected economic and financial indicators have been fixed assets, current assets, prepaid expenses and net profit, with the help of which we have calculated and analysed the return on total assets. Of the many subgroups of the HORECA sector, the "Other Food Services" subgroup, which had the highest return on assets (ROA), proved to be the most flexible and creative subgroup. Catering specialists, exploiting the context generated by the closing of hotels and restaurants, have modified their business so as to amplify the intrinsic value of their products and to become a psychological and social connection for their consumers.
Respiratory and Gut Microbiota of Children with Cystic Fibrosis: A Pilot Study
Authors: de Melo Vasco Jannaina Ferreira , A. Riedi Carlos , Marconi Camila , S. Nogueira Keite , Souza Rodrigues Luiza , Pine Omori Wellington , R. de Oliveira Rafael , Perreira-Ferrari Lilian , A. Rosário Filho Nelson
Published: November 2021

Differences in the clinical presentation of cystic fibrosis (CF) may be due to microbiota components and their relationship with the host’s immune system. In this pilot study, we aimed to investigate the composition of the respiratory and gut microbiota of a cohort of clinically stable children with CF, homozygous for the p.Phe508del mutation. Oropharyngeal swabs and stool samples were obtained from these children attending the CF referral clinics at the Hospital of Clinics, Federal University Paraná (CHC – UFPR). Oropharyngeal and gut microbiota were assessed by V3-V4 sequencing of the 16S ribosomal RNA, and bioinformatics analyses were performed using a proprietary pipeline. We identified a total of 456 bacterial taxa belonging to 164 genera, of which 65 (39.6 %) were common to both the respiratory and gastrointestinal tracts. Taxa from eight genera dominated more than 75 % of the microbial composition of both the niches. Among these dominant taxa, only Prevotella spp. were common to both the sites. Overall, the respiratory and gut microbiota were homogeneous among all the patients. Longitudinal studies targeting a larger cohort are important for an improved understanding of how the composition of bacterial communities is related to changes in the clinical status of CF