bluuebunny/crossref_metadata_2025_split huggingface dataset:
Space-time analyticity of weak solutions to semilinear parabolic systems with variable coefficients
Authors: Baustian Falko , Takac Peter 
Published: July 2023

We study analytic smooth solutions of a general, strongly parabolic semilinear Cauchy problem of 2m-th order in \(\mathbb{R}^N\times (0,T)\) with analytic coefficients (in space and time variables) and analytic initial data (in space variables).They are expressed in terms of holomorphic continuation of global (weak) solutions to the system valued in a suitable Besov interpolation space of \(B^{s;p,p}\)-type at every time moment \(t\in [0,T]\). Given \(0 < T'< T\leq \infty\), it is proved that any \(B^{s;p,p}\)-type solution \(u: \mathbb{R}^N\times (0,T)\to \mathbb{C}^M\) with analytic initial data possesses a bounded holomorphic continuation \(u(x + \mathrm{i}y, \sigma + \mathrm{i}\tau)\) into a complex domain in \(\mathbb{C}^N\times \mathbb{C}\) defined by \((x,\sigma)\in \mathbb{R}^N\times (T',T)\), \(|y| < A'\) and \(|\tau | < B'\), where \(A', B'> 0\) are constants depending upon~\(T'\). The proof uses the extension of a weak solution to a \(B^{s;p,p}\)-type solution in a domain in\(\mathbb{C}^N\times \mathbb{C}\), such that this extension satisfies the Cauchy-Riemann equations. The holomorphic extension is obtained with a help from holomorphic semigroups and maximal regularity theory for parabolic problems in Besov interpolation spaces of \(B^{s;p,p}\)-type imbedded (densely and continuously) into an \(L^p\)-type Lebesgue space. Applications include \emph{risk models} for European options in Mathematical Finance.
For more information see https://ejde.math.txstate.edu/special/01/b1/abstr.html
SIR epidemic models with spatial spread in bounded domains
Authors: Knolle Helmut , Santanilla Jairo 
Published: July 2023

The spread of an infectious disease which confers immunity after recovery from infection, can be described by a SIR model, i.e. a system of three differential equations for the dependent variables \(S\), \(I\), and \(R\), which are the numbers (densities) of susceptible, infectious and recovered (immune) individuals, respectively. The equations for \(S\) and \(I\) are typically nonlinear. In this article, we consider two spatio-temporal SIR models. The first model is similar to reaction-diffusion systems in chemistry. A simple birth-and-death process is incorporated, and it is assumed, that a fraction f of the newborns is vaccinated and is then immune for life. We show how the smallest eigenvalue of the eigenvalue problem associated with the linearized equation for I is related to the basic reproduction number \(\mathcal{R}_0\), a key concept in the mathematical theory of infectious diseases. Here it is defined by a variational principle. We show that the disease-free equilibrium is asymptotically stable if \(\mathcal{R}_0<1\), or if \(\mathcal{R}_0\ge 1\) and \(f>1-1/{\mathcal{R}_0}\), and unstable if \(\mathcal{R}_0>1\) and \(f<1-1/\mathcal{R}_0\). In the other model we assume that the population consists of sedentary individuals who leave their home only temporarily. Both models suggest that restriction of mobility may be counterproductive for the control of an epidemic outbreak.
For more information see https://ejde.math.txstate.edu/special/01/k2/abstr.html
Connected components of positive solutions of biharmonic equations with the clamped plate conditions in two dimensions
Authors: Ma Ruyun , Zhao Zhongzi , Yan Dongliang 
Published: July 2023

This article concerns the clamped plate equation $$\displaylines{ \Delta^2 u=\lambda a(x)f(u), \quad \text{in } \Omega,\cr u=\frac {\partial u}{\partial \nu}= 0 \quad \text{on } \partial \Omega, }$$ where \(\Omega\) is a bounded domain in \(\mathbb{R}^2\) of class \(C^{4, \alpha}\), \(a\in C(\bar \Omega, (0, \infty))\), \(f: [0, \infty)\to [0,\infty)\) is a locally H\"older continuous function with exponent \(\alpha\), and \(\lambda\) is a positive parameter. We show the existence of S-shaped connected component of positive solutions under suitable conditions on the nonlinearity. Our approach is based on bifurcation techniques.
For more information see https://ejde.math.txstate.edu/special/m1/c5/abstr.html
Generalized quasilinear equations with critical growth and nonlinear boundary conditions
Authors: Maia Liliane de A. , Oliveira Junior Jose Carlos , Ruviaro Ricardo 
Published: July 2023

We study the quasilinear problem $$\displaylines{ -\text{div}(h^2(u)\nabla u) + h(u)h'(u)|\nabla u|^2+u =-\lambda |u|^{q-2}u+|u|^{2 \cdot 2^*-2}u\quad \text{in } \Omega, \cr \frac{\partial u}{\partial\eta}= \mu g(x,u) \quad \text{on } \partial \Omega, }$$ where \(\Omega \subset \mathbb{R}^3\) is a bounded domain with regular boundary \(\partial \Omega\), \(\lambda,\mu>0\), \(1<q<4\), \(2\cdot2^{\ast}=12\), \(\frac{\partial }{\partial\eta}\) is the outer normal derivative and \(g\) has a subcritical growth in the sense of the trace Sobolev embedding. We prove a regularity result for all weak solutions for a modified, and introducing a new type of constraint, we obtain a multiplicity of solutions, including the existence of a ground state.
For more information see https://ejde.math.txstate.edu/special/01/m3/abstr.html
Limit for the p-laplacian equation with dynamical boundary conditions
Authors: Ozturk Eylem , Rossi Julio D. 
Published: July 2023

In this article we study the limit as $p\to \infty$ in the evolution problem driven by the p-Laplacian with dynamical boundary conditions. We prove that the natural energy functional associated with this problem converges to a limit in the sense of Mosco convergence and as a consequence we obtain convergence of the solutions to the evolution problems. For the limit problem we show an interpretation in terms of optimal mass transportation and provide examples of explicit solutions for some particular data.
For more information see https://ejde.math.txstate.edu/special/01/o1/abstr.html
Remarks on periodic resonant problems with nonlinear dissipation
Authors: Sanchez Luis , Silva Joao G. 
Published: July 2023

We consider the periodic problem for a 2nd order ODE with non-invertible linear part, and mild nonlinear dissipation term. The motivation for this study is a paper by Lazer [9] We add a bounded restoring force g(u) and show that the sufficient condition (of Landesman-Lazer type) given in [9] still implies the existence of a periodic solution in our case. We also comment on some variants of the problem and on the existence of bounded solutions.
Ffor more information see https://ejde.math.txstate.edu/special/01/s1/abstr.html
Design and Construction of an Automated Flood Intimation System
Authors: Saleheen Rezwan Us , Ahmed Farhan  , Enamul Hoq  , Farhan Mahbub  
Published: July 2023

Flooding is a crucial concern for creating substantial economic and social impacts for different regions of Bangladesh. The country's geographical location makes most of the area highly vulnerable to floods. Despite people's suffering during flood conditions, comprehensive research on developing an automotive flood intimation system is inadequate. Flooding is the inundation of water onto land that is normally dry, followed by rain, snow, coastal storms, storm surges, overflows of rivers, and dam failure. Early detection of rising water levels may reduce the damaging impact of floods and also allow adequate time to develop integrated flood adaptation and management mechanisms. Therefore, this study proposed an automated flood intimation system using Arduino. The system integrates the feature of determining three distinct parameters involving temperature, humidity, water level, and wind speed. The design emphasized the early detection of rising water levels and provided the necessary acknowledgement to reduce the impact of floods. Post-flood effects involve water pollution, water-borne diseases, and other epidemics in flood-affected communities. Hence, the proposed system might be helpful for proper support management during natural calamities like floods to reduce the suffering of people.
ESTETIKA ANIMASI: KONSEP DAN GAYA ANIMASI BUL
Authors: Yasa Gede Pasek Putra Adnyana 
Published: July 2023

Animasi berjudul Bul adalah karya animasi terbaik kategori film animasi 2 Dimensi dalam lomba Animafest Film Animasi di MNCTV. Animasi ini diproduksi oleh salah satu studio animasi yang ada di Bali. Studio animasi tersebut adalah Timeline Studio. Hal ini menarik untuk ditelusuri atau diteliti pada tataran estetika terutama terkait konsep dan gaya animasinya. Penelitian dimulai dari melakukan pengamatan terhadap animasi Bul. Selanjutnya dilakukan penelitian lapangan untuk mempelajari, dan mengungkap bagaimana estetika sebuah animasi Bul dibentuk dari unsur seni rupa/desain dan pembentuk film. Penelitian ini menghasilkan data deskriptif berupa kata-kata tertulis atau ungkapan dari seseorang dan studi perilaku senimannya dan objek tertentu yang diamati. Penelitian kualitatif sebagai fundamental bergantung pada pengamatan atas objek dan manusia dalam ruang lingkup suatu kawasan tertentu. Hasil penelitian menunjukkan bahwa konsep estetika atau pemikiran untuk dapat menciptakan tercapainya keindahan yang secara khusus dapat mempengaruhi psikologis/alam bawah sadar penonton terhadap animasi Bul diwujudkan melalui gaya film animasi. Gaya animasi sebagai salah satu konsep yang dapat menciptakan keindahan yaitu digunakan gaya limited. Animasi Bul menerapkan gaya limited dalam animasinya mengacu pada ciri-ciri animasi limited yaitu lebih banyak digunakan pada film animasi berseri di stasiun televisi, gerak animasi sederhana, mengutamakan cerita dibanding gerak animasinya, menggunakan gerak animasi berulang.
As secretarias acadêmicas como espaços educativos na educação profissional e tecnológica
Authors: Szadkoski Marta Helena , Paixão Marcia Valéria 
Published: July 2023

O presente artigo apresenta um estudo sobre os espaços educativos com o objetivo de situar as Secretarias Acadêmicas como ambientes educativos na Educação Profissional Tecnológica. O pacote metodológico inclui questionários, entrevistas semiestruturadas, revisão bibliográfica e pesquisa documental que foram observados através de uma análise interpretativa que revelou as Secretarias Acadêmicas como realizadores de procedimentos formativos e como local de troca de significados, signos, símbolos entre os indivíduos que dele participam. Um espaço de interações repleto de outros espaços resultantes de atividades humanas e de significados compartilhados e comunicados nas ações humanas. Estando em um espaço educacional, foi possível considerá-las como espaços educativos. Este estudo é parte dos resultados da pesquisa de mestrado do Programa de Pós-graduação em Educação Profissional e Tecnológica - ProfEPT, cuja dissertação resultou em produto educacional que enfoca as atividades formativas desenvolvidas pela Secretaria Acadêmica, apresentado como Guia de orientações, e que pode contribuir no desenvolvimento das atividades formativas desenvolvidas nesse espaço. Os resultados obtidos com a pesquisa demonstram a importância de conhecer a Secretaria Acadêmica a fim de difundir a relevância desse espaço dentro da instituição de ensino, demonstrando que suas competências não são somente sobre atividades burocráticas, mas envolvem práticas educativas.
Empreendimentos turísticos e sustentabilidade: estudo de caso da cidade do Porto (Portugal)
Authors: Rua Orlando Lima , Silva Igor Filipe Martins 
Published: July 2023

O objetivo fundamental deste estudo é analisar o impacto dos empreendimentos turísticos na sustentabilidade da atividade turística, no caso específico da cidade do Porto (Portugal). Para esta pesquisa foi escolhida a pesquisa quantitativa, mais concretamente a realização e divulgação de um inquérito por questionário estruturado, já que permite uma resposta prática, rápida, anónima e em grande número, sendo que o questionário foi respondido apenas por residentes da cidade do Porto. Através de uma amostra composta por 166 indivíduos, os resultados permitiram concluir que (1) os empreendimentos turísticos, através das suas receitas, podem contribuir para o desenvolvimento de medidas mais sustentáveis que contribuem para a construção de um destino mais sustentável, (2) a construção de empreendimentos turísticos na cidade, aos olhos dos residentes, implica um uso excessivo do solo e dos recursos do território, prejudicando o nível de sustentabilidade da cidade e (3) de um modo geral, os empreendimentos turísticos, devem ser construídos de forma sustentada, sob a orientação de um bom plano de ordenamento de território e com a adoção de medidas de funcionamento sustentáveis, de modo a minimizar os impactos negativos causados no meio físico e cultural, aumentando os impactos positivos, contribuindo, dessa forma, para a construção de um destino cada vez mais sustentável, tendo em consideração a digitalização e a transição digital em curso.
Potato Market Structure, Conduct and Performance in Tete Province of Mozambique
Authors: Sandramo Paulino Bartolomeu , Edriss Abdi-Khalil 
Published: July 2023

Since over 85 percent (%) of potato production in Mozambique comes from Tete province, it was necessary to develop the present study in order to assess the current structure, conduct and performance of potato market in this region so as to improve the discussions of the potato industry in the country. Based on this objective, the study targeted four districts of Tete province, namely Angonia, Tsangano, Moatize and Tete town. Data were collected through a survey in February 2021, using multistage random sampling techniques to 152 potato traders in 10 markets of these districts. The structure, conduct and performance theory was used. Gini coefficient indices were used to analyze the structure of potato markets, frequency and percentage were used to analyze the conduct of potato markets and marketing margins were the tools applied to analyze the performance of potato markets. The result indicated that in overall sampled potato markets, the Gini Coefficient Index was 0.25 out of 1.0 indicating that potato markets were competitive. In addition, 78.9% of potato traders reported that selling price depended on the forces of demand and supply. Despite of this, traders were getting 57.9% of consumer’s price and 42.1% was the producer participation. Among the selected potato markets, Lizulu and 1o de Maio respectively were found to be most efficient with indices of 669.2% and 1,718.8%. A 100% of potato traders were unanimous on pointing a lack of cold storage facilities as a major constraint to potato marketing which influence price to be unstable. In the study area, the size of the market-share and the distribution of income is almost the same between different categories of traders and the business is profitable. Policy recommendations of strengthening the rehabilitation of rural roads and establishment of cooling centres among others can promote potato marketing in Mozambique.
Determination of Antihypergycemic Effect of Flaxseed (L. usititatissimum) Fractions on Streptozotocin-induced Diabetic Rats
Authors: Abigail Adugbe , Godwin Vongdip Nanman , Uduakobong Obot Blessing , Luka Carol. D. 
Published: July 2023

Diabetes is a metabolic disorder characterized by persistent high blood glucose level. Flaxseed is one of the functional foods used in the management of diabetes mellitus. The study aimed to evaluate the effects of different fractions of Flaxseed on albino diabetic rats, and diabetes was induced using streptozotocin. The fractions were obtained using solvents with increasing polarity, namely n-Hexane, Ethylacetate, Methanol, and Water. The presence of various phytochemicals, including alkaloids, flavonoids, tannins, saponins, balsam, carbohydrates, phenols, and resins, were identified. The phytochemical analysis revealed that the methanolic fraction contained the highest concentration of bioactive components, followed by the aqueous fraction. Significant reductions in blood glucose levels were observed across the groups treated with the Flaxseed fractions. The methanolic fraction exhibited the highest antihyperglycemic property (5.90±0.536), followed by the aqueous fraction (8.73±0.536). The hexane fraction ranked next to the aqueous fraction (20.50±1.617), while the ethylacetate fraction had the least antihyperglycemic effect (23.60±0.731). However, the protein and albumin biomarkers showed significant increase across all treatment groups. The Flaxseed fractions also demonstrated antihyperlipidemic properties, with the methanolic fraction being the most potent. Additionally, the treatment groups exhibited improved kidney function biomarkers, serum enzyme levels, and electrolyte levels. Based on the results of this investigation, Flaxseed proves to be a potent antihyperglycemic and antihyperlipidemic food. Moreover, the methanolic fraction demonstrated the greatest ameliorative effect, followed by the aqueous fraction.
Statistical Analysis of Monocyte Monolayer Assay Validation in Brazilian Blood Donors
Authors: Kahl Jéssica Hanser Nunes , Schorner Everaldo José , Kupek Emil 
Published: July 2023

Aims: To validate the monocyte monolayer assay (MMA) technique concerning its suitability for blood donor screening and its cost per test performed. The MMA is an in vitro simulation of the behavior of the antibodies, demonstrating the reactions that would occur in the endothelial reticulum system after a transfusion of incompatible red blood cells, indicating the risk of a hemolytic transfusion reaction and therefore of the clinical significance of the antibodies.
Study Design: Blood samples of alloimmunized patients, selected at random from a blood donation bank, were submitted to validation tests recommended by the Brazilian National Health Surveillance Agency for the approval of new testing procedures.
Place and Duration of Study: The following Brazilian institutions were involved between June 2009 and July 2010: Immunohematology laboratory of the Hematology and Hemotherapy Center of Santa Catarina state in Florianópolis, Department of Medicine (Medical Unit IV) and Department of Radiology of the Institute of Medical Sciences, Hospital Lahore in São Paulo.
Methodology: Ninety samples of alloimmunized patients treated by the Santa Catarina blood donors were used. The validation tests evaluated the selectivity, linearity, precision, and accuracy of the MMA method and determined the limits of detection and quantification. External validation of the method was performed by comparing these results with those of an independent laboratory in São Paulo, while making sure that the latter was blind to the results of the former. The coefficient of variation was used to express the MMA testing precision of 5 replicates across 5 different concentration levels. Type I error for evaluating statistical significance was set at 5%.
Results: Selectivity assessment of the impact of multiple alloantibodies on the MMA test result showed no statistically significant difference (P>0.05) across the titers of 64, 256, and 2048, each with three replications, thus confirming the test specificity. Homoscedasticity of the monocyte index (MI) data was not refuted by Levine's test with the F-value of 0.746, much below the value of 3.056 needed to achieve a statistical significance level of P<0.05. MI linearity against the logarithm of the alloantibody concentration was shown in a simple linear regression where the latter predicted 83% of the variation in the former, and the regression slope of 0.4 (95% confidence interval 0.32, 0.48). The limits of detection and quantification on the logarithm scale were 0.28 and 0.84, respectively. External validation found no statistically significant difference between the MMA test results from the two independent laboratories. The coefficient of variation of <15% indicated good MMA testing precision under routine laboratory conditions.
Conclusion: The assay met all validation criteria and was therefore effective in assessing the clinical significance of alloantibodies.
Varietal Evaluation of Ber (Zizyphus mauritiana Lamk.) for Yield and Fruits Quality Attributes under Bundelkhand Region of Uttar Pradesh, India
Authors: Kumar Dharmendra , Prakash Om , Sarfaraj  , Kumar Siddharth , Kumar Vikas , Yadav Shubham 
Published: July 2023

The experiment was conducted at Instruction farm, College of Horticulture, Banda University of Agriculture and Technology, Banda (U.P.) during the year 2021-2022. The trail consisting of ten treatments (T1 -Thai Ber, T2 -Umran, T3 -Banarasi Karaka, T4 -Seb, T5 -Gola, T6 -Chhuhara, T7 -Kaithali, T8 -Mundia, T9 -Elaichi and T10 –Rashmi). The variability was recorded in fruit shape (ovate oblong, oblong, ovate and round), fruit colour (green, yellow green, golden yellow and green) and pulp colour (creamy white and creamy). The yield attributes variability was observed in fruit length (3.40-5.72 cm), fruit width (2.13-4.20 cm), fruit weight (20.27-48.33 g), fruit volume (21.21-49.25 cc), stone length (1.59-2.80 cm), stone width (0.86-2.07 cm), stone weight (1.41-2.83 g), pulp weight (16.22-44.24 g), pulp and stone ratio (11.31-15.61) and specific gravity (0.95-0.98). The quality attributes parameter also showed wide range of variation in chemical properties i.e., TSS (10.61-16.62 0Brix), ascorbic acid (80.5-115.33 mg/100g), reducing sugars (4.05-7.11 %), non-reducing sugars (3.90-4.75 %), total sugars (7.95-11.86 %), acidity (0.32-0.75 %), protein (0.40-0.70 %) and pH (3.0-5.0). Therefore, on the basis of quality attribute among the different evaluation; the variety T7 (Kaithali), T2 (Umran) and T3 (Banarasi Karaka) found to be superior. These promising varieties can be recommended for commercial cultivation at farmer’s field.
Risk Factors and Outcomes of Complete Heart Block in Children after Surgical Closure of Ventricular Septal Defects: The Role of Pacemaker Therapy
Authors: Nady Moshera Mohamed El , Amrousy Doaa Mohamed El , Lotfy Wael Mohamed , Zoair Amr Mohamed 
Published: July 2023

Background: Many issues might arise with surgical closure, such as postoperative pain, sternotomy scar, and postoperative arrhythmias as well as heart block. The purpose of this study was to identify the risk factors for complete heart block (CHB) among children following surgical ventricular septal defect (VSD) closure.
Methods: This retrospective work was performed on 126 pediatric individuals, with a history of VSD closure surgically. There were two groups of participants: Group 1 (Post-surgical CHB group): (n=42) had CHB. and Group 2 (Post-surgical non CHB group): (n=84) without CHB.
Results: Temporary Pacemaker was needed in 11 cases (26.19%), temporary then endocardial pacemaker occurred in 21 cases (50%), epicardial pacemaker occurred in 3 cases (7.14%), and endocardial pacemaker in 7 cases (16.67%). No complications occurred in 38 cases (90.48%), sepsis after one week occurred in 1 case (2.38%). Body weight at closure, type of VSD, mean pulmonary arterial pressure (mPAP) before surgery and procedure time were independent significant predictors for occurrence of CHB (P<0.05).
Conclusions: Low body weight at closure, large peri-membranous and inlet VSD, high mPAP before surgery were independent significant risk factors or predictors for occurrence of CHB after surgical closure of VSD. Pacemaker therapy is the only beneficial therapy of post-operative CHB.