bluuebunny/crossref_metadata_2025_split huggingface dataset:
Visual analysis of self-organizing maps
Authors: Stefanovič Pavel , Kurasova Olga 
Published: August 2019

In the article, an additional visualization of self-organizing maps (SOM) has been investigated. The main objective of self-organizing maps is data clustering and their graphical presentation. Opportunities of SOM visualization in four systems (NeNet, SOM-Toolbox, Databionic ESOM and Viscovery SOMine) have been investigated. Each system has its additional tools for visualizing SOM. A comparative analysis has been made for two data sets: Fisher’s iris data set and the economic indices of the European Union countries. A new SOM system is also introduced and researched. The system has a specific visualization tool. It is missing in other SOM systems. It helps to see the proportion of neurons, corresponding to the data items, belonging to the different classes, and fallen in the same SOM cell.
Lie group analysis for the effects of chemical reaction on MHD stagnation-point flow of heat and mass transfer towards a heated porous stretching sheet with suction or injection
Authors: Afify Ahmed A. A. , Elgazery Nasser S. S. 
Published: August 2019

An analysis is carried out to study two dimensional stagnation-point flow of heat and mass transfer of an incompressible, electrically conducting fluid towards a heated porous stretching sheet embedded in a porous medium in the presence of chemical reaction, heat generation/absorption and suction or injection effects. A scaling group of transformations is applied to the governing equations. After finding three absolute invariants a third order ordinary differential equation corresponding to the momentum equation and two second order ordinary differential equation corresponding to energy and diffusion equations are derived. Furthermore the similarity equations are solved numerically by using shooting technique with fourth-order Runge–Kutta integration scheme. A comparison with known results is excellent. The phenomenon of stagnation-point flow towards a heated porous stretching sheet in the presence of chemical reaction, suction or injection with heat generation/absorption effects play an important role on MHD heat and mass transfer boundary layer. The results thus obtained are presented graphically and discussed.
Some applications of IFS based on square symmetries
Authors: Bareikis Gintautas , Maciulis Algirdas 
Published: August 2019

This paper describes a fractal based method for generating the pseudorandom permutations. We construct an Iterated Function System (IFS) belonging to the class of square symmetries and simulate the pseudorandom walk on a square. In this way some families of key based permutations are generated. The cardinalities of generated families are analysed.
Pest control using virus as control agent: A mathematical model
Authors: Pathak Sweta , Maiti Alakes 
Published: August 2019

It is now well recognised that biocontrol of pests is one of the best ecofriendly alternative for pest control. In this paper we have studied dynamical behaviours of a model for biocontrol of pests, where it is assumed that the pest is affected by a virus. Boundedness and stability of the model are studied. The effect of time-delay is investigated. Numerical simulations are carried out to illustrate our analytical findings. It is observed that the time-delay has a regulatory impact on the system. Biological implications of our results are discussed.
The first integral method and traveling wave solutions to Davey–Stewartson equation
Authors: Jafari Hossein , Sooraki Atefe , Talebi Yahya , Biswas Anjan 
Published: August 2019

In this paper, the first integral method will be applied to integrate the Davey–Stewartson’s equation. Using this method, a few exact solutions will be obtained using ideas from the theory of commutative algebra. Finally, soliton solution will also be obtained using the traveling wave hypothesis.
Robust exponential stability of nonlinear impulsive switched systems with time-varying delays
Authors: Liu Xiu , Zhong Shouming , Ding Xiuyong 
Published: August 2019

This paper deals with a class of uncertain nonlinear impulsive switched systems with time-varying delays. A novel type of piecewise Lyapunov functionals is constructed to derive the exponential stability. This type of functionals can efficiently overcome the impulsive and switching jump of adjacent Lyapunov functionals at impulsive switching times. Based on this, a delay-independent sufficient condition of exponential stability is presented by minimum dwell time. Finally, an illustrative numerical example is given to show the effectiveness of the obtained theoretical results.
Laws of Little in an open queueing network
Authors: Minkevičius Saulius , Steišūnas Stasys 
Published: August 2019

The object of this research in the queueing theory is theorems about the functional strong laws of large numbers (FSLLN) under the conditions of heavy traffic in an open queueing network (OQN). The FSLLN is known as a fluid limit or fluid approximation. In this paper, FSLLN are proved for the values of important probabilistic characteristics of the OQN investigated as well as the virtual waiting time of a customer and the queue length of customers. As applications of the proved theorems laws of Little in OQN are presented.
A simple mathematical model for the spread of two political parties
Authors: Misra Arvind Kumar Kumar 
Published: August 2019

In this paper, a non-linear mathematical model for the spread of two political parties has been proposed and analyzed by using epidemiological approach. The whole population is assumed to be a constant and homogeneously mixed. Equilibria have been obtained analytically and their local and global stability have been discussed. Conditions for the co-existence of both the political parties have been obtained. Numerical simulation is also performed to support the analytical results.
New exact traveling wave solutions for DS-I and DS-II equations
Authors: Yildirim Ahmet , Paghaleh Ameneh Samiei Samiei , Mirzazadeh Mohammad , Moosaei Hossein , Biswas Anjan 
Published: August 2019

In this present work, the simplest equation method is used to construct exact solutions of the DS-I and DS-II equations. The simplest equation method is a powerful solution method for obtaining exact solutions of nonlinear evolution equations. This method can be applied to nonintegrable equations as well as to integrable ones.
Hopf bifurcation and optimal control in a diffusive predator-prey system with time delay and prey harvesting
Authors: Chang Xiaoyuan , Wei Junjie 
Published: August 2019

In this paper, we investigated the dynamics of a diffusive delayed predator-prey system with Holling type II functional response and nozero constant prey harvesting on no-flux boundary condition. At first, we obtain the existence and the stability of the equilibria by analyzing the distribution of the roots of associated characteristic equation. Using the time delay as the bifurcation parameter and the harvesting term as the control parameter, we get the existence and the stability of Hopf bifurcation at the positive constant steady state. Applying the normal form theory and the center manifold argument for partial functional differential equations, we derive an explicit formula for determining the direction and the stability of Hopf bifurcation. Finally, an optimal control problem has been considered.
An unconstrained binary quadratic programming for the maximum independent set problem
Authors: Douiri Sidi Mohamed Mohamed , Elbernoussi Souad 
Published: August 2019

For a given graph G = (V, E) the maximum independent set problem is to find the largest subset of pairwise nonadjacent vertices. We propose a new model which is a reformulation of the maximum independent set problem as an unconstrained quadratic binary programming, and we resolve it afterward by means of a genetic algorithm. The efficiency of the approach is confirmed by results of numerical experiments on DIMACS benchmarks.
Theory and computational study of electrophoretic ion separation and focusing in microfluidic channels
Authors: Klymenko Oleksiy V. V. , Amatore Christian , Sun Wen , Zhou Yong-Liang , Tian Zhao-Wu , Svir Irina 
Published: August 2019

In this work we describe the theory and 2D simulation of ion separation and focusing in a new concept of microfluidic separation device. The principle of the method of ion focusing is classical in the sense that it consists in opposing a hydrodynamic transport ensured by the solution flow to an electrophoretic driving force so that any ionic sample results poised within the microchannel at the point where the two forces equilibrate. The originality of the concept investigated here relies on the fact that thanks to the use of an ion-conducting membrane of variable thickness in electrical contact with the channel the electrophoretic force is varied continuously all along the channel length. Similarly, changing the geometric shape of the membrane allows a facile optimization of the device separation and focusing properties.
Some exact solutions to the generalized Korteweg–de Vries equation and the system of shallow water wave equations
Authors: Dolapci Ihsan Timuçin Timuçin , Yıldırım Ahmet 
Published: August 2019

In this paper, we establish exact solutions for nonlinear evolution equations in mathematical physics. The exp-transform method is proposed to seek solitary solutions, periodic solutions and compaction-like solutions of nonlinear differential equations. The generalized KdV equation and the system of the shallow water wave equation are chosen to illustrate the effectiveness and convenience of the method.
Blow-up of the solution of a nonlinear Schrödinger equation system with periodic boundary conditions
Authors: Ivanauskas Feliksas , Puriuškis Gintaras 
Published: August 2019

We consider a system of nonlinear Schrödinger equations with periodic boundary conditions of the formi ∂uj/∂t + D2uj = −fj (u, ū), t ≥ 0, x ∈ (−2,2),uj (0, x) = uj0(x), x ∈ (−2,2),Dkuj (t, −2) = Dkuj (t, 2), t ≥ 0, k = 0, 1,where D = ∂/∂x, j = 1,..., m, fj (u, ū) = ∂g(u, ū)/∂ū, and ∂g/∂uj = –f j for some homogenous function g(u, ū) such that g(λu, λū) = λ6g(u, ū). We obtain sufficient conditions for blow-up of solutions of this system in C1([0,t0);H2(−2,2)).
Stabilizing uncertain steady states of some dynamical systems by means of proportional feedback
Authors: Tamaševičiūtė Elena , Tamaševičius Arūnas 
Published: August 2019

A simple zero-order proportional feedback technique for stabilizing unknown fixed points is described. The technique employs either artificially created or natural stable fixed point to find the coordinates of the unknown unstable fixed point. Four physical examples have been investigated, namely the mechanical pendulum, the autonomous Duffing damped oscillator, the van der Pol oscillator, and the Lorenz system have been considered both analytically and numerically.
Global dynamics of a delayed epidemic model with latency and relapse
Authors: Xu Rui 
Published: August 2019

A mathematical model describing the transmission dynamics of an infectious disease with an exposed (latent) period, relapse and a saturation incidence rate is investigated. By analyzing the corresponding characteristic equations, the local stability of a disease-free equilibrium and an endemic equilibrium is established. By using suitable Lyapunov functionals and LaSalle’s invariance principle, it is proven that if the basic reproduction number is less than unity, the diseasefree equilibrium is globally asymptotically stable and therefore the disease fades out; and if the basic reproduction number is greater than unity, the endemic equilibrium is globally asymptotically stable and the disease becomes endemic.
Expansions in Appell polynomials of the convolutions of probability distributions
Authors: Bikelis Algimantas , Padvelskis Kazimieras 
Published: August 2019

We use the composition method to analyse the convolutions of probability distributions by emploing the Appell polynomials and Bergström identity. Our approximation is based on the probability distributions which have the inverse generalized measure of bounded variation. The idea to use the accompanying probability distribution eλ(F−E), λ > 0, was first proposed by B.V. Gnedenko [1].
Some new fixed point results in non-Archimedean fuzzy metric spaces
Authors: Salimi Peyman , Vetro Calogero , Vetro Pasquale 
Published: August 2019

In this paper, we introduce the notions of fuzzy (α,β,ϕ)-contractive mapping, fuzzy α-φ-ψ-contractive mapping and fuzzy α-β-contractive mapping and establish some results of fixed point for this class of mappings in the setting of non-Archimedean fuzzy metric spaces. The results presented in this paper generalize and extend some recent results in fuzzy metric spaces. Also, some examples are given to support the usability of our results.
A note on the max-sum equivalence of randomly weighted sums of heavy-tailed random variables
Authors: Yang Yang , Wang Kaiyong , Leipus Remigijus , Šiaulys Jonas 
Published: August 2019

This paper investigates the asymptotic behavior for the tail probability of the randomly weighted sums ∑k=1nθkXk and their maximum, where the random variables Xk and the random weights θk follow a certain dependence structure proposed by Asimit and Badescu [1] and Li et al. [2]. The obtained results can be used to obtain asymptotic formulas for ruin probability in the insurance risk models with discounted factors.
Capecitabine and Temozolomide in Advanced Lung Neuroendocrine Neoplasms
Authors: Al-Toubah Taymeyah , Morse Brian , Strosberg Jonathan 
Published: August 2019

Abstract

Background
Patients with advanced lung neuroendocrine neoplasms (NENs) have few treatment options. Capecitabine and temozolomide have recently showed significant activity in patients with pancreatic neuroendocrine tumors (NETs), but data in lung NETs are limited.

Methods
We retrospectively reviewed the records of patients treated at a large referral center to identify patients seen between January 2008 and September 2018 with metastatic lung NENs who received treatment with capecitabine and temozolomide (CAPTEM). Patients with small cell lung cancer were excluded. The primary endpoint was overall response rate per RECIST 1.1. Secondary endpoints included progression-free survival, overall survival, and toxicity.

Results
Twenty patients were identified who received treatment with capecitabine and temozolomide. Fourteen (70%) had typical lung NETs, five had (25%) atypical carcinoids, and one (5%) had disease defined as a large-cell neuroendocrine carcinoma. Nineteen patients were evaluable for response. Six (30%) patients exhibited a best response of partial response per RECIST 1.1 criteria, 11 (55%) stable disease, and 2 (10%) progressive disease; objective response rate was 30%, and disease control rate was 85%. Eleven patients eventually progressed, only six of whom exhibited progression per RECIST 1.1 criteria. Median progression-free survival was 13 months (95% confidence interval [CI], 4.4–21.6 months). Median overall survival was 68 months (95% CI, 35.3–100.7 months). Toxicity profile was mild with mainly grade 1, expected toxicities. Six patients required dose reduction because of toxicity.

Conclusion
The CAPTEM regimen is associated with a high response rate and a relatively tolerable toxicity profile in lung NENs. This regimen warrants further exploration in a prospective clinical trial.
Upper‐Crustal Anisotropy of the Conjugate Strike‐Slip Fault Zone in Central Tibet Analyzed Using Local Earthquakes and Shear‐Wave Splitting
Authors: Wu Chenglong , Tian Xiaobo , Xu Tao , Liang Xiaofeng , Chen Yun , Zhu Gaohua , Badal José , Bai Zhiming , Yu Guiping , Teng Jiwen 
Published: August 2019

Abstract
Remarkable V‐shaped conjugate strike‐slip faults extend along the Bangong–Nujiang suture in central Tibet. Motions of these faults are considered to accommodate ongoing east–west extension and north–south contraction. Fabrics within the fault zone that are anisotropic to seismic waves can provide clues as to the unusual scale and style of lithospheric deformation. With the goal of determining the upper‐crustal anisotropy pattern in central Tibet, we measured shear‐wave splitting parameters (fast wave polarization direction and delay time) using waveforms generated by 194 local earthquakes recorded by 49 stations of the SANDWICH network. Stations located in eastern and western zones of the study area show anisotropy directions that agree well with the maximum horizontal compressive stress direction. The fast polarization directions at stations near active strike‐slip faults generally run parallel to the strikes of these faults. Pervasive inactive thrust faults caused by Cretaceous–Tertiary shortening in central Tibet also clearly correlate with the anisotropy detected at nearby stations. These results demonstrate that both local structures and stress contribute to upper‐crustal anisotropy in the region. Combining the new results with previous SKS‐wave splitting results and other seismic evidence, we propose that deformation in the upper crust is mechanically decoupled from that in the upper mantle, due to eastward middle‐lower crustal flow. This crustal flow causes basal shearing required for the formation of conjugate strike‐slip faults in central Tibet.
Comparative study of tubal patency by sonosalpingogram hysterosalpingography and diagnostic laparoscopy
Authors: Reddy Spoorthy , Padma M. 
Published: August 2019

Background: Sonosalpingography has been suggested as the first-line method to study tubal patency. This study is to bring into focus the value of pelvic sonogram in accessing tubal patency in order to overcome the radiation hazard associated with hysterosalpingogram reduce the cost of examination and encourage it at first-line office. Objective of this study was to compare the diagnostic efficacy of sonosalpingogram, hysterosalpingography and diagnostic laparoscopy for tubal patency as a cause for female infertility.Methods: It is a prospective study in 100 patients attending for evaluation of infertility for a period of 2 years were chosen for this study. All cases with primary and secondary infertility who have attended infertility clinic for tubal causes.Results: 68 cases were found to have bilateral patency as per SSG while 58 cases had bilateral patency as HSG. Similarly 24 cases had bilateral block as per SSG while 28 cases had bilateral block as per HSG. 8 cases had unilateral block as per SSG while 14 cases had unilateral block as per HSG. This difference in observations may probably attribute to tubal spasm in HSG. Bilateral patency was observed in 68 cases as against 64 cases in laparoscopy. Out of these 68 cases 9 cases were false positive as bilaterally patent. However bilateral blocks were shown to be 24 in both methods. Out of 12 cases of unilateral block as per laparoscopy 8 cases were detected by SSG. There was false negative rate of 5%. There was false negative rate of 10% for tubal patency with HSG.Conclusions: For low risk subjects for tubal factors in infertility, sonosalpingogram can be employed as a screening test of choice and for high risk subjects HSG and laparoscopy can be used.
Neuro-imaging study in eclampsia
Authors: Swain Sujata , Jena Paresh Kumar 
Published: August 2019

Background: Eclampsia is associated with increased risk of maternal death varying from 1.8 % in developed countries to 14 % in developing countries. Cerebral complications are the major cause of death in eclampsia patients. Eclampsia along with hypercoagulopathy of pregnancy is a high risk fact for patient in respect of development of cerebrovascular thrombosis/haemoorhage. Eclampsia patients have been found to have various CNS pathological conditions amenable to the medical treatment. The aim of the study is to know the neuropathophysiology behind an eclamptic seizure to reduce the morbidity associated with it.Methods: Prospective study design included 50 patients for the study. All patients were admitted in the eclampsia room with h/o convulsions. All patients were put on MgSO4 therapy and anti-hypertensive. Cranial CT scan examinations were performed for all patients within 24hours of last convulsion without intravenous contrast material injection. Time taken to recover from all the clinical symptoms like altered consciousness, defective vision, headache and seizure and the maternal outcome are compared. Results: 62% of patients with eclampsia had detectable pathological changes in CT scan. Cerebral edema was the most common CT scan finding with parietal lobe was the most common site (90.32%) of pathological changes. Mortality rate was high among eclamptic patients with cerebral hemorrhage.Conclusions: CT scan was found to be effective in detecting cerebral pathology in more than half of the eclamptic patients. The most common pathological changes detected are cerebral edema and cerebral infarction. CT scan may not be required for the diagnosis of eclampsia, but it must be used in certain complicated patients to detect cerebral pathology at the earliest so that specific management could be provided to reduce the maternal mortality.
Comparison of RMI 3 and RMI 4 in pre-operative evaluation of ovarian masses
Authors: Bahadur Badugu Rao , Koneru Gangadhara Rao , Kodey Prabha Devi , Melam Jyothi 
Published: August 2019

Background: To differentiate ovarian mass as benign or malignant could change clinical approach. Finding a screening and diagnostic method for ovarian cancer is challenging due to high mortality and insidious symptoms. Risk malignancy index (RMI) has the advantage of rapid and exact triage of patients with ovarian mass.Methods: Prospective study carried for 2 years at NRI Medical College and General Hospital, Chinakakani, Mangalagiri, Andhra Pradesh, India. 79 patients with ovarian mass were investigated and risk malignancy index (RMI-3 and RMI-4) calculated. Final confirmation was done based on histopathological report. Sensitivity, specificity, positive predictive value and negative predictive value were calculated for RMI 3 and RMI 4 taking histopathology as control and comparison was done.Results: (n=79); 50 (63.29%) cases were benign and 29 (36.70%) were malignant based on histopathology. RMI 4 is more sensitive (68.96%) than RMI 3 (62.06%), but RMI 3 is more specific (94%) than RMI 4 (92%).The positive predictive value of RMI-3 and RMI-4 were 85.71% and 83.33% respectively. The negative predictive value for RMI-4 and RMI-3 were 83.63% and 81.03% respectively.Conclusions: With increasing age, chance of malignancy increases. RMI 4 was more sensitive than RMI-3, however less specific than RMI 3 in differentiating benign and malignant tumors. The positive predictive value is slightly more for RMI 3, than RMI 4. Negative predictive value is slightly more for RMI 4, than RMI 3.