bluuebunny/crossref_metadata_2025_split huggingface dataset:
Biological control in French Guiana, Guadeloupe and Martinique.
Authors: Ryckewaert P. , Vayssières J. F. 
Published: December 2019

Abstract

Several biological control agents have been introduced successfully in French Guiana, Guadeloupe and Martinique: three tachinid dipterans and one hymenopteran for control of sugarcane borers, a ladybird and a hymenopteran parasitoid against the pink hibiscus mealybug, a hymenopteran parasitoid to control Asian citrus psyllid, another hymenopteran parasitoid against citrus blackfly and a hymenopteran parasitoid for control of fruit flies. Mass rearings of a lacewing and a Trichogramma egg parasitoid are being implemented in Martinique for augmentative biocontrol. Use of native natural enemies in conservation biocontrol projects is being initiated in several crops, after a period of intensive prospecting for natural enemies. A project started recently in French Guiana aims to control the mango mealybug by introducing two exotic parasitoids.
Biological control in Venezuela.
Authors: Vásquez C. , Ferrer F. , Colmenarez Y. C. , Morales Sanchez J. 
Published: December 2019

Abstract

Venezuela has a long history in application of pest biological control. The first attempts were recorded at the end of the 19th century with the use of Scelio famelicus for control of the migratory locust Schistocerca paranensis and continued in the middle of the 20th with the introduction of Rodolia cardinalis to control the citrus scale Icerya purchasi, Aphelinus mali for control of Eriosoma lanigera and the Amazonian fly Lydella minense to control the sugarcane borer Diatraea saccharallis. Although chemical control has been widely used by Venezuelan farmers, biocontrol has been implemented in some crops such as sugarcane and maize partially due to the development of artificial diets that allowed the mass production of some parasitoids such as Trichogramma spp., Telenomus remus, Cotesia flavipes and the predators Chrysoperla carnea and Orius tristicolor. This review shows data on emblematic cases of the utilization of biocontrol in Venezuela and also the prospect of using other invertebrate organisms (arthropod, nematodes) as well as microorganisms in different crops. Finally, since Venezuela has a very rich biodiversity, it is presumed that a large number of entomopathogens, predators and parasitoids remain to be discovered and evaluated for potential use in biocontrol programmes, increasing the possibilities of the use of biocontrol agents in new crops, and a large range of studies to be done.
Aroids: developmental physiology.
Authors: Lebot V. 
Published: December 2019

Abstract

Taro and other aroids have a similar growth cycle, although for Alocasia and Cyrtosperma it is much longer than for Colocasia and Xanthosoma, which need to be replanted every year to produce good-quality corms and cormels. The life cycle of Amorphophallus paeoniifolius is almost identical to that of taro, except for the greater duration (at least 16 months) of the period from seed germination to flowering. This chapter describes the growth cycle, photoperiodism, effect of temperature, nutrition, water deficit and stress, and climate change adaptation of aroids.
Effects of high stocking density on broiler chicken and turkeys.
Authors: Butterworth A. 
Published: December 2019

Abstract
Poultry, particularly broilers, have become a barometer for least cost production, and can be purchased in many supermarkets for less money per kg than some fruits and vegetables. This production philosophy places very significant pressure on chicken farmers, and on chickens - one inevitable result of which is to maximize the number of animals which can be farmed in a given space. This is the logic of economics, but is not based on the balance of probabilities that chickens kept at the highest stocking densities have a demonstrably reduced quality of life. What do chickens actually need? - nobody can truly say, but we can probably hazard some pretty good guesses. Chickens are sentient, capable of feeling pain and avoiding sources of stress and distress when they are given a choice. Free range and back yard birds show a large range of adaptive behaviours, but many of these behaviours cannot be expressed in intensive indoor conditions. Society asks a lot of the chicken - we expect it grow very fast (egg to plate in 36 days), to be affordable and available, and yet, most people also hope that the industry behind their chicken dinner will be practically invisible, and will provide good animal welfare. In this review, we focus on the impacts on animal welfare linked with high stocking densities. The European Commission decision to limit stocking density is in conflict with the viewpoint of many producers who want to increase the number of birds housed to improve their profit. In this review, we examine some of the published evidence for stocking density maxima, and discuss the role of pressurization of stocking density resulting from farming based only on price competition.
An Integrable Matrix Camassa-Holm Equation*
Authors: Chan Li-Feng , Xia Bao-Qiang , Zhou Ru-Guang 
Published: December 2019

Abstract

We present an integrable sl(2)-matrix Camassa-Holm (CH) equation. The integrability means that the equation possesses zero-curvature representation and infinitely many conservation laws. This equation includes two undetermined functions, which satisfy a system of constraint conditions and may be reduced to a lot of known multi-component peakon equations. We find a method to construct constraint condition and thus obtain many novel matrix CH equations. For the trivial reduction matrix CH equation we construct its N-peakon solutions.
Effects of Thermal Radiation and Slip Mechanism on Mixed Convection Flow of Williamson Nanofluid Over an Inclined Stretching Cylinder
Authors: Khan Masood , Hamid Aamir , Hashim  
Published: December 2019

Abstract

The current investigation highlights the mixed convection slip flow and radiative heat transport of uniformly electrically conducting Williamson nanofluid yield by an inclined circular cylinder in the presence of Brownian motion and thermophoresis parameter. A Lorentzian magnetic body force model is employed and magnetic induction effects are neglected. The governing equations are reduced to a system of nonlinear ordinary differential equations with associated boundary conditions by applying scaling group transformations. The reduced nonlinear ordinary differential equations are then solved numerically by Runge-Kutta-Fehlberg fifth-order method with shooting technique. The effects of magnetic field, Prandtl number, mixed convection parameter, buoyancy ratio parameter, Brownian motion parameter, thermophoresis parameter, heat generation/absorption parameter, mass transfer parameter, radiation parameter and Schmidt number on the skin friction coefficient and local Nusselt are analyzed and discussed. It is found that the velocity of the fluid decreases with decrease in curvature parameter, whereas it increases with mixed convection parameter. Further, the local Nusselt number decreases with an increase in the radiation parameter. The numerical comparison is also presented with the existing published results and found that the present results are in excellent agreement which also confirms the validity of the present methodology.
FEM for Blood-Based SWCNTs Flow Through a Circular Cylinder in a Porous Medium with Electromagnetic Radiation*
Authors: R. Eid Mohamed , Al-Hossainy A. F. , Zoromba M. Sh. 
Published: December 2019

Abstract

This work aims to study magnetohydrodynamic flow through a circular cylinder in a horizontal position of SWCNTs in blood as a base fluid in the existence of non-linear thermal radiation and heat source/sink. Three kinds of nanoparticles shapes are considered. The study is employed the finite element technique to explore and enhance the influences of essential parameters on temperature profiles and is debated the heat transport within blood injects with SWCNTs and exposes to electromagnetic radiation. The treatment with thermal analysis and heat transfer rate being a better substitute more than surgery and chemotherapy for cancer therapy. Utilizing of nanoparticles thermal features is a mounting area of nanomedicine field because of the probable for purposeful demolition of cancer cells. This remedy is relied on many parameters, including nanofluid thermal conductivity, nanoparticles volume fraction, thermal radiation and power and heat source. The numerical solutions for flow and heat transfer features are assessed for diverse governing parameters values. The obtained results are substantiated against the relevant numerical results in the published researches. Results show that both flow velocity and temperature increase for larger values of thermal radiation, heat source and SWCNTs volume fraction with lamina and cylinder shapes. Also, spherical shape of SWCNTs occurs high disturbances in velocity and temperature distribution in the case of cooled cylinder.
The Phase Sensitivities for Different Phase-Shift Configurations in an SU(1,1) Interferometer*
Authors: Wang Fan , Zhong Wei , Zhou Lan , Sheng Yu-Bo 
Published: December 2019

Abstract

We theoretically study the phase sensitivities of two different phase-shift configurations in an SU(1,1) interferometer with coherent ⊗ squeezed vacuum states. According to quantum Cramér-Rao theorem, we analytically obtain the ultimate phase sensitivities for two types of phase shift accumulating in one- and two-arm. Compared with the case of one-arm phase shift, the model with phase shift encoding in both arms may provide a better sensitivity when the strength of squeezed vacuum state is large enough. Furthermore, we discuss the achievable sensitivities with the homodyne measurement by invoking of error-propagation formula. In addition, we study the effect of internal and outernal photon losses on the phase sensitivity of the SU(1,1) interferometer and find that the unbalanced interferometer is helpful to improve precision even with high external losses.
An Improved Heterogeneous Mean-Field Theory for the Ising Model on Complex Networks*
Authors: Huang Feng , Chen Han-Shuang 
Published: December 2019

Abstract
Heterogeneous mean-field theory is commonly used methodology to study dynamical processes on complex networks, such as epidemic spreading and phase transitions in spin models. In this paper, we propose an improved heterogeneous mean-field theory for studying the Ising model on complex networks. Our method shows a more accurate prediction in the critical temperature of the Ising model than the previous heterogeneous mean-field theory. The theoretical results are validated by extensive Monte Carlo simulations in various types of networks.
Geometric scaling of two-level-system loss in superconducting resonators
Authors: Niepce David , Burnett Jonathan J , Latorre Martí Gutierrez , Bylander Jonas 
Published: December 2019

Abstract
We perform an experimental and numerical study of dielectric loss in superconducting microwave resonators at low temperature. Dielectric loss, due to two-level systems, is a limiting factor in several applications, e.g. superconducting qubits, Josephson parametric amplifiers, microwave kinetic-inductance detectors, and superconducting single-photon detectors. Our devices are made of disordered NbN, which, due to magnetic-field penetration, necessitates 3D finite-element simulation of the Maxwell–London equations at microwave frequencies to accurately model the current density and electric field distribution. From the field distribution, we compute the geometric filling factors of the lossy regions in our resonator structures and fit the experimental data to determine the intrinsic loss tangents of its interfaces and dielectrics. We put emphasis on the loss caused by a spin-on-glass resist such as hydrogen silsesquioxane (HSQ), used for ultrahigh lithographic resolution relevant to the fabrication of nanowires. We find that, when used, HSQ is the dominant source of loss, with a loss tangent of

δ

HSQ

i

=
8
×

10

−
3

.
Heralded amplification of nonlocality via entanglement swapping
Authors: Tsujimoto Yoshiaki , You Chenglong , Wakui Kentaro , Fujiwara Mikio , Hayasaka Kazuhiro , Miki Shigehito , Terai Hirotaka , Sasaki Masahide , Dowling Jonathan P , Takeoka Masahiro 
Published: December 2019

Abstract
To observe the loophole-free violation of the Clauser–Horne–Shimony–Holt (CHSH) inequality between distant two parties, i.e. the CHSH value

S
>
2

, the main limitation of distance stems from the loss in the transmission channel. The entanglement swapping relay (ESR) is a simple way to amplify the signal and enables us to evade the impact of the transmission loss. Here, we experimentally test the heralded nonlocality amplifier protocol based on the ESR. We observe that the obtained probability distribution is in excellent agreement with those expected by the numerical simulation with experimental parameters which are precisely characterized in a separate measurement. Moreover, we experimentally estimate the nonlocality of the heralded state after the transmission of 10 dB loss just before final detection. The estimated CHSH value is

S
=
2.113
>
2

, which indicates that our final state possesses nonlocality even with transmission loss and various experimental imperfections. Our result clarifies an important benchmark of the ESR protocol, and paves the way towards the long-distance realization of the loophole-free CHSH-violation as well as device-independent quantum key distribution.
Study of Geologically Consistent History Matching Peculiarities by Means of Gradient-Free Optimization Methods
Authors: Shiryaev I M , Zakirov E S , Indrupskiy I M 
Published: December 2019

Abstract
This paper presents some results and distinctive features of the algorithm for automated history matching of 3D reservoir flow models using gradient-free methods. Widely used Nelder-Mead method was chosen for optimization. In order to preserve geological consistency of a model within the history matching process, control parameters are comprised of “porosity-to-permeability” relation parameters, anisotropic (semi)variogram parameters, and reservoir properties at pilot points. The control parameters are used at each iteration of the history matching process to generate porosity and permeability distributions based on static well data and perform flow simulations. Test studies were conducted for a specially developed synthetic model representing a inhomogeneous five-spot well pattern element. Oil flow rates at production wells and water flow rate at the injection well, as well as bottomhole pressures of all wells were chosen as measured dynamic data in the objective function. The influence of initial guess of parameter values and relative weights in the objective function on the quality of reconstruction of the ‘true’ solution and convergence rate were evaluated. Problems of gradient-free optimization methods application and specific features of residuals normalization in the objective function, as well as influence of pilot points are discussed.
On the hamiltonian formulation of an octonionic integrable extension for the Korteweg-de Vries equation
Authors: Fernández Mercedes , Restuccia Alvaro , Sotomayor Adrián 
Published: December 2019

Abstract
We present in this work the hamiltonian formulation of an octonionic extension for the Korteweg-de Vries equation. The formulation takes into account the non commmutativity and non associativity of the implicit algebra which defines the equation. We also analize the Poisson structure of the hamiltonian formulation. We propose a parametric master Lagrangian which contains the two hamiltonian structures of the integrable octonionic equation.
Virtual laboratories of electromagnetism for education in engineering: A perception
Authors: González J D , Escobar J H , Beltrán J R , García-Gómez L , La Hoz J De 
Published: December 2019

Abstract
The influence of virtual tools as didactic means towards the study of electromagnetism phenomena takes greater relevance every day at the Universidad del Magdalena due to the inclusion of a visual and dynamic element beyond the reading of physical text books and even the development of laboratories real electromagnetism. This article shows a very positive perception on the part of the engineering students regarding the advanced virtual laboratories of electromagnetism, influencing the learning of physical concepts and the development of cognitive competences. Studentś understanding of the concepts of physics in the domain of electromagnetic physics was evaluated in a pre- and post-test design involving 60 participants assigned to four experimental groups and 30 participants assigned to the control group. There were two experimental conditions, namely, experimentation with manipulation of real material, experimentation with virtual manipulation, as well as a condition of control (ie, traditional instruction with no virtual experimentation). Conceptual tests were administered to assess student’s comprehension before, during and after the application of the virtual laboratories. The analyzes revealed that even though the two experimental conditions promote the conceptualization and correct interpretations of the student’s physical concepts in the domain of electromagnetism better than in the control group as expected; we see that, the use of the virtual tool obtains a greater acceptance as this study shows.
Perceptions in students of degree in computers on the use of Robotics in the teaching processes
Authors: Sánchez H , Martínez L S , González J D 
Published: December 2019

Abstract
The teaching of robotics in a properly planned and controlled environment has allowed its incursion into academic stages both in secondary and higher education. So it should be added that the teaching process in this area, motivates and enhances the creativity and cooperative work of the students, connecting it directly with mathematics, physics, computers and electronics, I feel this the foundations that underpin and consolidate as you progress in the teaching process. Therefore, one of the objectives of this tool is to create an interest in science and engineering in students. This study was carried out to answer the question: How do professors and undergraduate students describe the usefulness, effectiveness and efficiency of using a robot as a face-to-face education technology for a learning experience? Therefore, one of the objectives of this tool is to create an interest in science and engineering in students. This study was carried out to answer the question: How do professors and undergraduate students describe the usefulness, effectiveness and efficiency of using a robot as a face-to-face education technology for a learning experience? For this study, two surveys developed by researchers were conducted to evaluate the perceptions of professors and undergraduates in computer science in a learning experience. The results of this study indicate that the teachers and students of degree in computer of the University of Magdalena, consider the use of robots as a facilitator of teaching processes as a highly motivating tool to undertake new teaching strategies and suggest a greater exploration due to the versatility that Robotics offers today.
Investigation of Power Networks and their Patterns by Mathematical methods in order to Voltage Stability Enhancement
Authors: Moghimi Seyed Morteza , Bostani Ali , Elahimanesh Abolfazl 
Published: December 2019

Abstract
Authors in the research paper has considered IEEE 14-bus and 34-bus test network for creation generation and load patterns. This paper aims at analysing the potential impacts that distributed generation (DG) might have on voltage stability of electrical power networks. It is expected that increasing amounts of new generation technologies will be connected to electrical power systems in the near future. Most of these technologies are considerably smaller scale than conventional synchronous generators. In this paper, the impact of DG pattern (size and location of DG) on the voltage stability of two test system is investigated. The simulation methodology is discussed as well. It is found that the effects of DG the voltage stability of a power system strongly depend on the size and location of the distributed generators. The results show that install of DG on the weak bus, improve loadability limit and voltage stability and decrease loss of system. By investigating and reviewing the results of similar patterns in these two systems, the different generation and load patterns impact mechanism of DG units over the behaviour of the systems in terms loadability limit and voltage stability is achieved.
Scenario of the evolution of the universe with equation of state of the Weierstrass type gas
Authors: Tsyba Pyotr , Razina Olga , Barkova Zinaida , Bekov Sabit , Myrzakulov Ratbay 
Published: December 2019

Abstract
In this article, we examined the Starobinsky gravity model in homogeneous and isotropic space-time described by the Friedman-Robertson-Walker metric. In the framework of this model, cosmological parameters were described that explain it in the early and late evolutionary times, such as the slow roll parameters, perturbation of curvature, scalar-tensor ratio, equation of state parameter and deceleration parameter. For reconstruction, an ansatz of a special type was chosen, which can be considered as a generalization of the Chaplygin type of gas. Energy conditions are also calculated for this model. Dependencies of these parameters on cosmological time are plotted graphically.
Cosmological solutions of F (R, T) gravity model with k -essence
Authors: Yerzhanov Koblandy , Meirbekov Bekdaulet , Bauyrzhan Gulnur , Myrzakulov Ratbay 
Published: December 2019

Abstract
Now exist several alternative cosmological models that describe observable properties of our universe. In particular, it is such models as F (R) and F (T ) gravity. We consider properties of their generalization as F (R, T ) model of gravity with kessence. We obtained some exact solutions of particular cass of scale factor a for general formof the F (R, T ) functions with scalar field. These solutions describe the accelerated/deccelerated periods of the universe.
Traveling wave solutions for the (3+1)-dimensional Davey-Stewartson equations
Authors: Serikbayev N.S. , Shaikhova G.N. , Yesmakhanova K.R. , Myrzakulov R 
Published: December 2019

Abstract
In this work, the extended tanh method is used to construct wave solutions for the Davey–Stewartson equations. The extended tanh method is a powerful solution method for obtaining different kind solutions of nonlinear evolution equations. This method can be applied to nonintegrable equations as well as to integrable ones.
Analyzing museum exhibition spaces via visitor movement and exploration: The case of Whitworth Art Gallery of Manchester
Authors: Liakou Melpomeni , Kosmas Odysseas 
Published: December 2019

Abstract
To analyse the movement and exploration of visitors on museum exhibition spaces, agent based models that simulate their behaviour can be a useful tool. Such a model is proposed here, to which we use appropriate defined dynamical and social forces to describe their motions, while the resulting decision making procedure either preserves or creates groups of individuals. That proves to give realistic visitor motions to complex and multi level spaces while resulting the way they bypass obstacles, move to stairs or follow other groups on their way out. Simulation results are then used to analyse the exhibition spaces of the Whitworth Art Gallery throughout the motion flow of the visitors.