bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exact solutions for unsteady axial Couette flow of a fractional Maxwell fluid due to an accelerated shear
Authors: Athar Muhammad , Fetecau Corina , Kamran Muhammad , Sohail Ahmad , Imran Muhammad 
Published: August 2019

The velocity field and the adequate shear stress corresponding to the flow of a fractional Maxwell fluid (FMF) between two infinite coaxial cylinders, are determined by means of the Laplace and finite Hankel transforms. The motion is produced by the inner cylinder that at time t = 0+ applies a shear stress fta (a ≥ 0) to the fluid. The solutions that have been obtained, presented under series form in terms of the generalized G and R functions, satisfy all imposed initial and boundary conditions. Similar solutions for ordinary Maxwell and Newtonian fluids are obtained as special cases of general solutions. The unsteady solutions corresponding to a = 1, 2, 3, ... can be written as simple or multiple integrals of similar solutions for a = 0 and we extend this for any positive real number a expressing in fractional integration. Furthermore, for a = 0, 1 and 2, the solutions corresponding to Maxwell fluid compared graphically with the solutions obtained in [1–3], earlier by a different technique. For a = 0 and 1 the unsteady motion of a Maxwell fluid, as well as that of a Newtonian fluid ultimately becomes steady and the required time to reach the steady-state is graphically established. Finally a comparison between the motions of FMF and Maxwell fluid is underlined by graphical illustrations.
The Kaldor–Kalecki stochastic model of business cycle
Authors: Mircea Gabriela , Neamt¸u Mihaela , Opris Dumitru 
Published: August 2019

This paper is concerned with the deterministic and the stochastic delayed Kaldor–Kalecki nonlinear business cycle models of the income. They will take into consideration the investment demand in the form suggested by Rodano. The existence of the Hopf bifurcation is studied and the direction and the local stability of the Hopf bifurcation is also taken into consideration. For the stochastic model, the dynamics of the mean values and the square mean values of the model’s variables are set. Numerical examples are given to illustrate our theoretical results.
Global dynamics of a predator-prey system with Holling type II functional response
Authors: Tian Xiaohong , Xu Rui 
Published: August 2019

In this paper, a predator-prey system with Holling type II functional response and stage structure is investigated. By analyzing the corresponding characteristic equations, the local stability of each of feasible equilibria of the system is studied. The existence of the orbitally asymptotically stable periodic solution is established. By using suitable Lyapunov functions and the LaSalle invariance principle, it is proven that the predator-extinction equilibrium is globally asymptotically stable when the coexistence equilibrium is not feasible, and sufficient conditions are derived for the global stability of the coexistence equilibrium.
Optimal control of malaria chemotherapy
Authors: Magombedze Gesham , Chiyaka Christinah , Mukandavire Zindoga 
Published: August 2019

We present an intra-host mathematical model of malaria that describes the interaction of the immune system with the blood stage malaria merozoites. The model is modified by incorporating the effects of malaria drugs that target blood stage parasites. The optimal control represents a percentage effect of the chemotherapy of chloroquine in combination with chlorpheniramine on the reproduction of merozoites in erythrocytes. First we maximise the benefit based on the immune cells, and minimise the systemic cost based on the percentage of chemotherapies given and the population of merozoites. An objective functional to minimise merozite reproduction and treatment systemic costs is then built. The existence and uniqueness results for the optimal control are established. The optimality system is derived and the Runge–Kutta fourth order scheme is used to numerically simulate different therapy efforts. Our results indicate that highly toxic drugs with the compensation of high infection suppression have the potential of yeilding better treatment results than less toxic drugs with less infection suppression potential or high toxic drugs with less infection suppression potential. In addition, we also observed that a treatment protocol with drugs with high adverse effects and with a high potential of merozoite suppression can be beneficial to patients. However, an optimal control strategy that seeks to maximise immune cells has no potential to improve the treatment of blood stage malaria.
Analytical solution of MHD free convective flow of couple stress fluid in an annulus with Hall and ion-slip effects
Authors: Srinivasacharya Darbhashayanam , Kaladhar Kolla 
Published: August 2019

This paper presents the Hall and Ion-slip effects on electrically conducting couple stress fluid flow between two circular cylinders in the presence of a temperature dependent heat source. The governing non-linear partial differential equations are transformed into a system of ordinary differential equations using similarity transformations and then solved using homotopy analysis method (HAM). The effects of the magnetic parameter, Hall parameter, Ion-slip parameter and couple stress fluid parameter on velocity and temperature are discussed and shown graphically.
Alternating direction method for two-dimensional parabolic equation with nonlocal integral condition
Authors: Sapagovas Mifodijus , Jakubėlienė Kristina 
Published: August 2019

Two-dimensional parabolic equation with nonlocal condition is solved by alternating direction method in the rectangular domain. Values of the solution on the boundary points are bind with the integral of the solution in whole two-dimensional domain. Because of this nonlocal condition, the classical alternating direction method is complemented by the solution of low dimension system of algebraic equations. The peculiarities of the method are considered.
Analysis of a frictionless contact problem for elastic-viscoplastic materials
Authors: Selmani Mohamed , Selmani Lynda 
Published: August 2019

We consider a dynamic frictionless contact problem for elastic-viscoplastic materials with damage. The contact is modelled with normal compliance condition. The adhesion of the contact surfaces is considered and is modelled with a surface variable, the bonding field whose evolution is described by a first order differential equation. We derive variational formulation for the model and prove an existence and uniqueness result of the weak solution. The proof is based on arguments of nonlinear evolution equations with monotone operators, a classical existence and uniqueness result on parabolic inequalities, differential equations and fixed-point arguments.
Peristaltic transport of Johnson–Segalman fluid in a curved channel with compliant walls
Authors: Hina Sadia , Hayat Tasawar , Asghar Saleem 
Published: August 2019

The present investigation deals with the peristaltic flow of an incompressible Johnson–Segalman fluid in a curved channel. Effects of the channel wall properties are taken into account. The associated equations for peristaltic flow in a curved channel are modeled. Mathematical analysis is simplified under long wavelength and low Reynolds number assumptions. The solution expressions are established for small Weissenberg number. Effects of several embedded parameters on the flow quantities are discussed.
Multiple positive solutions to mixed boundary value problems for singular ordinary differential equations on the whole line
Authors: Yuji Yuji 
Published: August 2019

This paper is concerned with the mixed boundary value problem of the second order singular ordinary differential equation[Φ(ρ(t)x'(t))]' + f(t, x(t), x'(t)) = 0, t ∈ R,limt→−∞ x(t) = ∫−∞+∞ g(s, x(s), x'(s)) ds,limt→+∞ ρ(t)x'(t) = ∫−∞+∞h(s, x(s), x' (s)) ds.Sufficient conditions to guarantee the existence of at least one positive solution are established. The emphasis is put on the one-dimensional p-Laplacian term [Φ(ρ(t)x'(t))]' involved with the nonnegative function ρ satisfying ∫−∞+∞1/ρ(s) ds = +∞.
A coupled common fixed point theorem for a family of mappings
Authors: Choudhury Binayak S. S. , Metiya Nikhilesh , Das Pradyut 
Published: August 2019

In this paper we introduce the concept of coincidentally commuting pair in the context of coupled fixed point problems. It is established that an arbitrary family of mappings has a coupled common fixed point with two other functions under certain contractive inequality condition where two specific members of the family are assumed to be coincidentally commuting with these two functions respectively. The main result has certain corollaries. An example shows that the main theorem properly contains one of its corollaries.
A novel chaotic system and its topological horseshoe
Authors: Li Chunlai , Wu Lei , Li Hongmin , Tong Yaonan 
Published: August 2019

Based on the construction pattern of Chen, Liu and Qi chaotic systems, a new threedimensional (3D) chaotic system is proposed by developing Lorenz chaotic system. It’s found that when parameter e varies, the Lyapunov exponent spectrum keeps invariable, and the signal amplitude can be controlled by adjusting e. Moreover, the horseshoe chaos in this system is investigated based on the topological horseshoe theory.
A new family of fourth-order methods for multiple roots of nonlinear equations
Authors: Liu Baoqing , Zhou Xiaojian 
Published: August 2019

Recently, some optimal fourth-order iterative methods for multiple roots of nonlinear equations are presented when the multiplicity m of the root is known. Different from these optimal iterative methods known already, this paper presents a new family of iterative methods using the modified Newton’s method as its first step. The new family, requiring one evaluation of the function and two evaluations of its first derivative, is of optimal order. Numerical examples are given to suggest that the new family can be competitive with other fourth-order methods and the modified Newton’s method for multiple roots.
A predator-prey model with disease in prey
Authors: Rahman Md. Sabiar Sabiar , Chakravarty Santabrata 
Published: August 2019

. The present investigation deals with the disease in the prey population having significant role in curbing the dynamical behaviour of the system of prey-predator interactions from both ecological and mathematical point of view. The predator-prey model introduced by Cosner et al. [1] has been wisely modified in the present work based on the biological point of considerations. Here one introduces the disease which may spread among the prey species only. Following the formulation of the model, all the equilibria are systematically analyzed and the existence of a Hopf bifurcation at the interior equilibrium has been duly carried out through their graphical representations with appropriate discussion in order to validate the applicability of the system under consideration
Existence and uniqueness of solutions for a singular system of higher-order nonlinear fractional differential equations with integral boundary conditions
Authors: Wang Lin , Zhang Xingqiu , Lu Xinyi 
Published: August 2019

In this paper, we study the existence and uniqueness of solutions for a singular system of nonlinear fractional differential equations with integral boundary conditions. We obtain existence and uniqueness results of solutions by using the properties of the Green’s function, a nonlinear alternative of Leray–Schauder-type, Guo–Krasnoselskii’s fixed point theorem in a cone and the Banach fixed point theorem. Some examples are included to show the applicability of our results.
A Treatment-Decision Score for HIV-Infected Children With Suspected Tuberculosis
Authors: Marcy Olivier , Borand Laurence , Ung Vibol , Msellati Philippe , Tejiokem Mathurin , Huu Khanh Truong , Do Chau Viet , Ngoc Tran Duong , Ateba-Ndongo Francis , Tetang-Ndiang Suzie , Nacro Boubacar , Sanogo Bintou , Neou Leakhena , Goyet Sophie , Dim Bunnet , Pean Polidy , Quillet Catherine , Fournier Isabelle , Berteloot Laureline , Carcelain Guislaine , Godreuil Sylvain , Blanche Stéphane , Delacourt Christophe ,   ANRS 12229 PAANTHER 01 STUDY GROUP
Published: August 2019

BACKGROUND:
Diagnosis of tuberculosis should be improved in children infected with HIV to reduce mortality. We developed prediction scores to guide antituberculosis treatment decision in HIV-infected children with suspected tuberculosis.

METHODS:
HIV-infected children with suspected tuberculosis enrolled in Burkina Faso, Cambodia, Cameroon, and Vietnam (ANRS 12229 PAANTHER 01 Study), underwent clinical assessment, chest radiography, Quantiferon Gold In-Tube (QFT), abdominal ultrasonography, and sample collection for microbiology, including Xpert MTB/RIF (Xpert). We developed 4 tuberculosis diagnostic models using logistic regression: (1) all predictors included, (2) QFT excluded, (3) ultrasonography excluded, and (4) QFT and ultrasonography excluded. We internally validated the models using resampling. We built a score on the basis of the model with the best area under the receiver operating characteristic curve and parsimony.

RESULTS:
A total of 438 children were enrolled in the study; 251 (57.3%) had tuberculosis, including 55 (12.6%) with culture- or Xpert-confirmed tuberculosis. The final 4 models included Xpert, fever lasting &gt;2 weeks, unremitting cough, hemoptysis and weight loss in the past 4 weeks, contact with a patient with smear-positive tuberculosis, tachycardia, miliary tuberculosis, alveolar opacities, and lymph nodes on the chest radiograph, together with abdominal lymph nodes on the ultrasound and QFT results. The areas under the receiver operating characteristic curves were 0.866, 0.861, 0.850, and 0.846, for models 1, 2, 3, and 4, respectively. The score developed on model 2 had a sensitivity of 88.6% and a specificity of 61.2% for a tuberculosis diagnosis.

CONCLUSIONS:
Our score had a good diagnostic performance. Used in an algorithm, it should enable prompt treatment decision in children with suspected tuberculosis and a high mortality risk, thus contributing to significant public health benefits.
A new and showy species of Lepanthes (Orchidaceae: Pleurothallidinae) from North-Western Ecuador
Authors: Baquero Luis E. , Jaramillo-Vivanco Tatiana , Galarza Verkovitch Denisse 
Published: August 2019

A new species of Lepanthes from north-western Ecuador is presented here. Lepanthes mashpica is similar to L. satyrica, with a long, descending, triangular process of the body of the lip but different in the simple and acute appendix versus the vertically bilobed appendix of L. satyrica. The species was found growing in several locations of Mashpi Reserve, a low-land cloud forest close to Quito.

Keywords: Ecuadorean orchids, Lepanthes mashpica, Lepanthes satyrica, Mashpi Reserve
Prevalence and Determinants of Depression among Burn Injured Patients Admitted To Specialized Burn Hospital, Baghdad, Iraq
Authors: Ammar Zainab Natiq Naji , Al-Abbudi Shalan Joodah Rhemah , Razaq Emad Abdul 
Published: August 2019

Background:
Burn injuries are associated with extreme stress and affect psychological and physical aspects of patients’ health. Depression is a major result of burn injury which affect recovery and rehabilitation of burn injury patients.
Objectives: To estimate the prevalence and determinant of depression and severity of depression in burn injury patients admitted to the Specialized Burn Hospital, Baghdad, Iraq
Method: Case control study included all adult patients, who fulfilled inclusion criteria. Sociodemographic data and burn related information were assessed by a questionnaire prepared for this study. DSM-V criteria of depression were used to ascertain the diagnosis of depression. Beck depression inventory II was used for assessment of severity of depression.
Results: This study included 120 burn victims. The prevalence of depression was 83.3%. Severity of depression was; mild (36.0%), moderate (44%) and severe depression 20%.
Conclusion: Proper psychiatric assessment for depression of all burn patients is of great importance because depression can affect recovery process in burn survivors.
Szignifikáns inverz kapcsolat a pajzsmirigy-stimuláló hormon (TSH) és a prosztataspecifikus antigén (PSA) vérszintjei között 40–75 éves korú férfiakban
Authors: Tóth Zoltán , Gyarmati Béla , Szabó Tamás , Vásárhelyi Barna 
Published: August 2019

Abstract: Introduction: Recent experiments and clinical studies indicate the contribution of thyroid hormones to prostate pathology. Aim: In our retrospective analyzis of university patient population, we evaluated the association between thyroid stimulatory hormone (TSH) and prostate specific antigen (PSA). Method: From the Laboratory Information System we retrieved the data of male patients between 40 and 75 years of age who had been subjected to simultaneous TSH and PSA measurements during the last 12 years (n = 7279). The association between logTSH and logPSA levels was tested with multiple regression analysis and adjusted for age. Results: Significant associations between logPSA and logTSH and age (r = 0.297 and 0.472, respectively) were detected. PSA levels were higher in patients with TSH below (n = 405) than in those with TSH within reference range (TSH 0,35–4,95 mU/ml) (n = 6698) (PSA level: 1.118 [0.639–2.338] vs. 0.920 [0.508–1.826] ng/ml, p<0.016). Based on estimates, a 10% decrease in TSH is associated with a 0.42% increase in PSA levels in our population. This corresponds to a 42% increase in PSA levels in the same patient if he would present with 0.2 mU/ml instead of 2.0 mU/ml TSH. Conclusion: The finding that hyperthyreosis might be associated with higher PSA levels indicates that PSA reference ranges would differ in hyperthyreotic and in euthyreotic patients. Probably the PSA clinical decision limits is also recommended to be modified according to the patient’s thyroid status. Orv Hetil. 2019; 160(35): 1376–1379.
A dóziscsökkentés lehetőségei CT-képalkotás során az iteratív képrekonstrukció alkalmazásával
Authors: Bajzik Gábor , Tóth Anett , Donkó Tamás , Kovács Péter , Sipos Dávid , Pandur Attila András , Moizs Mariann , Hadjiev Janaki , Repa Imre , Kovács Árpád 
Published: August 2019

Abstract: Introduction and aim: In case of imaging modalities using ionizing radiation, radiation exposure of the patients is a vital issue. It is important to survey the various dose-reducing techniques to achieve optimal radiation protection while keeping image quality on an optimal level. Method: We reprocessed 105 patients’ data prospectively between February and April 2017. The determination of the radiation dose was based on the effective dose, calculated by multiplying the dose-length product (DLP) and dose-conversation coefficient. In case of image quality we used signal-to-noise ratio (SNR) based on manual segmentation of region of interest (ROI). For statistical analysis, one sample t-test and Wilcoxon signed rank test were used. Results: Using iterative reconstruction, the effective dose was significantly lower (p<0.001) in both native and contrast-enhanced abdominal, contrast-enhanced chest CT scans and in the case of the total effective dose. At native and contrast-enhanced abdominal CT scans, the noise content of the images showed significantly lower (p<0.001) values for iterative reconstruction images. At contrast-enhanced chest CT scans there was no significant difference between the noise content of the images (p>0.05). Conclusion: Using iterative reconstruction, it was possible to achieve significant dose reduction. Since the noise content of the images was not significantly higher using the iterative reconstruction compared to the filtered back projection, further dose reduction can be achievable while preserving the optimal quality of the images. Orv Hetil. 2019; 160(35): 1387–1394.
A diabeteses cardialis autonóm neuropathia diagnosztikája
Authors: Sztanek Ferenc , Jebelovszki Éva , Gaszner Balázs , Zrínyi Miklós , Páll Dénes , Kempler Péter , Harangi Mariann 
Published: August 2019

Abstract: Cardiac autonomic neuropathy (CAN) is a common complication in type 1 and 2 diabetes and is defined as the impairment of autonomic control of the cardiovascular system. CAN is strongly associated with increased mortality, and in some studies with morbidity of vascular complications, such as stroke, coronary artery disease and myocardial infarction. At the early stages, CAN can be subclinical and it becomes clinically evident as the disease progresses. Subclinically, the disease is defined by cardiovascular reflex testing, which may have prognostic implications. Clinically, the impairment in autonomic function is associated with resting tachycardia, exercise intolerance, orthostatic hypotension, syncope, intraoperative cardiovascular instability, silent myocardial infarction and ischemia, and increased mortality. Although very common and serious, CAN is a frequently overlooked complication of diabetes. Because the progression of cardiovascular denervation is partly reversible or can be slowed down in the early stages of the disease, recent guidelines strongly recommend screening for CAN in patients with diabetes. In this review we summarize the diagnostic tools suggested in the screening for diabetic CAN. Orv Hetil. 2019; 160(35): 1366–1375.
Alternativas de modelos de negocios para las mipymes colombianas desde la responsabilidad social empresarial, el comercio justo, los negocios inclusivos y el valor compartido
Authors: Hernández Bernal Patricia 
Published: August 2019

Propósito: El objetivo de este artículo es proponer una alternativa estratégica a los empresarios de las Mipymes y a los nuevos emprendedores colombianos, a partir de la responsabilidad social empresarial (RSE), el comercio justo, los negocios inclusivos y el valor compartido, como opción de nuevas formas de producción y creación de desarrollo. Descripción: Se presenta de forma independiente cada uno de los temas haciendo un recorrido sucinto con el fin de sensibilizar al lector en cuanto a nuevas prácticas de hacer negocios. Punto de vista: se considera pertinente y oportuno establecer una reflexión académica, que lleva a la visualización de los campos de acción de la RSE en el caso colombiano. Es así como es necesaria una investigación que, en primera instancia, brinde la claridad sobre las raíces teóricas de la RSE y al mismo tiempo se construya un marco teórico, en donde se pueda identificar los conceptos con los que guarda relación. Conclusiones: El compromiso de los nuevos empresarios o empresarios renovados, debe ser pensar en el progreso de la calidad de vida sus empleados y el buen vivir de sus familias, logística inversa, sostenibilidad de la cadena de suministro, entre otros aspectos.