bluuebunny/crossref_metadata_2025_split huggingface dataset:
Periodic elliptic operators with asymptotically preassigned spectrum
Authors: Khrabustovskyi Andrii 
Published: November 2019

We deal with operators in Rn of the form A=−1/b(x)Σk=1n∂/∂xk(a(x)∂/∂xk), where a(x),b(x) are positive, bounded and periodic functions. We denote by Lper the set of such operators. The main result of this work is as follows: for an arbitrary L>0 and for arbitrary pairwise disjoint intervals (αj,βj)⊂[0,L], j=1,…,m (m∈N) we construct the family of operators {Aε∈Lper}ε such that the spectrum of Aε has exactly m gaps in [0,L] when ε is small enough, and these gaps tend to the intervals (αj,βj) as ε→0. The idea how to construct the family {Aε}ε is based on methods of the homogenization theory.
Simultaneous study of the diffraction by a 2D-convex obstacle through boundary layer method and microlocal analysis
Authors: Bouche Daniel , Lafitte Olivier 
Published: November 2019

In this paper we consider the high frequency diffraction of electromagnetic waves by a strictly convex obstacle. We restrict ourselves to the case of an obstacle in 2D and to the diffraction of a TE or TM wave. The aim of this paper is to present simultaneously with the same notations, unknowns and special functions the boundary layer analysis of this problem with stretched variables using the intuition of the solutions and the microlocal analysis way of construction of an adapted parametrix. We concentrate on the case of diffraction, i.e. studying the representation of a creeping wave on the boundary, which occurs in the case of the study of a glancing point. We use both methods to derive the exact solution near a diffractive point, obtaining results in terms of suitable Airy functions.
Homogenization via unfolding in periodic elasticity with contact on closed and open cracks
Authors: Cioranescu Doina , Damlamian Alain , Orlik Julia 
Published: November 2019

We consider the elasticity problem in a heterogeneous domain with an ε-periodic micro-structure, ε<<1, including multiple micro-contacts between the structural components. These components can be a simply connected matrix domain with open cracks or inclusions completely surrounded by cracks, which do not touch the outer boundary. The contacts are described by the Signorini and Tresca-friction contact conditions. The Signorini condition is described mathematically by a closed convex cone, while the friction condition is a nonlinear convex functional over the interface jump of the solution on the oscillating interface. The difficulties appear when the inclusions are completely surrounded by cracks and can have rigid displacements. In this case, in order to obtain preliminary estimates for the solution in the ε-domain, the Korn inequality should be modified, first in the fixed context and then for the ε-dependent periodic case. Additionally, for all states of the contact (inclusions can freely move, or are locked/sticked to the interface with the matrix, or the frictional traction is achieved on the inclusion-matrix interface and the inclusions can slide in the tangential to the interface direction) we obtain estimates for the solution in the ε-domain, uniform with respect to ε. An asymptotic analysis (as ε→0) for the nonlinear functionals over the growing interface is carried out, based on the application of the periodic unfolding method for sequences of jumps of the solution on the oscillating interface. This allows to obtain the homogenized limit as well as a corrector result.
Scale-transformations and homogenization of maximal monotone relations with applications
Authors: Visintin Augusto 
Published: November 2019

In homogenization, two-scale models arise, e.g., by applying Nguetseng's notion of two-scale convergence to nonlinear PDEs. A homogenized single-scale problem may then be derived via scale-transformations. A variational formulation due to Fitzpatrick is here used for the scale-integration of two-scale maximal monotone relations, and for the converse operation of scale-disintegration. These results are applied to the periodic homogenization of a quasilinear model of Ohmic electric conduction with Hall effect: $\lefteqn{\vec{E}\in\vec{\alpha}(\vec{J},x/\varepsilon )+h(x/\varepsilon )\vec{J}\times\vec{B}(x/\varepsilon )+\vec{E}_{a}(x/\varepsilon ),}$ $\lefteqn{\nabla\times\vec{E}=\vec{g}(x/\varepsilon ),\qquad\nabla\cdot\vec{J}=0\quad\mbox{in }\varOmega,}$ with $\vec{\alpha}(\cdot,x/\varepsilon )$ maximal monotone, $\vec{B},\vec{E}_{a},h,\vec{g}$ prescribed fields. (This corresponds to a quasilinear second-order elliptic equation in curl form: $\nabla\times\vec{\beta}(\nabla\times u,x/\varepsilon )=\vec{g}(x/\varepsilon )$ .) This result is also retrieved via De Giorgi's Γ-convergence.
A Liouville comparison principle for solutions of semilinear parabolic second-order partial differential inequalities
Authors: Kurta Vasilii V. 
Published: November 2019

We obtain a new Liouville comparison principle for entire weak solutions (u,v) of semilinear parabolic second-order partial differential inequalities of the form ut−ℒu−|u|q−1u≥vt−ℒv−|v|q−1v  (*) in the half-space S=R+×Rn, where n≥1 is a natural number, q>0 is a real number and ℒ=Σi,j=1n ∂/∂xi [aij(t,x) ∂/∂xj]. We assume that the coefficients aij(t,x), i,j=1,…,n, of the operator ℒ are functions that are defined, measurable and locally bounded in S. We also assume that aij(t,x)=aji(t,x), i,j=1,…,n, for almost all (t,x)∈S and that Σi,j=1naij(t,x)ξiξj≥0 for almost all (t,x)∈S and all ξ∈Rn. The critical exponents in the Liouville comparison principle obtained, which are responsible for the non-existence of non-trivial (i.e., such that u\not\equiv v) entire weak solutions to (*) in S, depend on the behavior of the coefficients of the operator ℒ at infinity. As direct corollaries we obtain a new Fujita comparison principle for entire weak solutions (u,v) of the Cauchy problem for the inequality (*), as well as new Liouville-type and Fujita-type theorems for non-negative entire weak solutions u of the inequality (*) in the case when v≡0. All the results obtained are new and sharp.
Determination of Ethanol Content in Fuels with Phononic Crystal Sensor
Authors: Mukhin N. V. , Oseev A. , Kutia M. M. , Borodacheva E. S. , Korolev P. G. 
Published: December 2019

Introduction. In-line analysis of ethanol content in gasoline blends is currently one of the urgent needs of fuel industry. Developing safe and secure approaches is critical for real applications. A phononic crystal sensor have been introduced as an innovative approach to high performance gasoline sensing. Distinguishing feature of proposed sensor is the absence of any electrical contact with analysed gasoline blend, which allows the use of sensors directly in pipelines without the risk of explosion in an emergency.Aim. Investigation of the possibilities of using phononic sensor structures to determine the ethanol content in liquid hydrocarbons.Materials and methods. A theoretical analysis of sensor structure was carried out on the basis of numerical simulation using COMSOL Multiphysics software. For measurement, substances of ordinary gasoline and gasoline 63–80 with ethanol concentrations in the range of 1–10 % by volume in increments of 2 % were prepared. The phononic crystal sensor was designed as a stainless steel plate with cylindrical holes and a resonant cavity, formed as a running across the wave propagation path slit between two lattices.Results. In-line analysis of measuring the concentration of ethanol in alcohol-containing fuels on a phononic crystal structure with a resonant cavity was carried out. Using the Agilent4395A admittance meter, the transmission spectra of longitudinal acoustic waves through the gasoline-filled sensor structure with were obtained. The non-linear correlation between the composition and the speed of sound of the blend is presented in the article is due to the ability to reduce the speed of sound of the mixture with an increase in ethanol concentration in the range of 0–10 % by volume.Conclusion. A measurement structure on the basis of phononic crystal was created. The measurements of various gasoline-ethanol mixtures show that the sensor has significant sensitivity (0.91 kHz/ms−1 ) with quality factor of 200) to distinguish between regular fuels, gasoline based blends and the presence of additives in standard fuels. The sensor has prospects for in-line analyzes the composition of liquid hydrocarbons.
Wideband Waveguide-to-Microstrip Transition for mm-Wave Applications
Authors: Mozharovskiy Andrey V. , Soykin Oleg V. , Artemenko Aleksey A. , Maslennikov Roman O. , Vendik Irina B. 
Published: December 2019

Introduction. Increased data rate in modern communication systems can be achieved by raising the operational frequency to millimeter wave range where wide transmission bands are available. In millimeter wave communication systems, the passive components of the antenna feeding system, which are based on hollow metal waveguides, and active elements of the radiofrequency circuit, which have an interface constructed on planar printed circuit boards (PCB) are interconnected using waveguide-to-microstrip transition.Aim. To design and investigate a high-performance wideband and low loss waveguide-to-microstrip transition dedicated to the 60 GHz frequency range applications that can provide effective transmission of signals between the active components of the radiofrequency circuit and the passive components of the antenna feeding systemMaterials and methods. Full-wave electromagnetic simulations in the CST Microwave Studio software were used to estimate the impact of the substrate material and metal foil on the characteristics of printed structures and to calculate the waveguide-to-microstrip transition characteristics. The results were confirmed via experimental investigation of fabricated wideband transition samples using a vector network analyzer Results. The probe-type transition consist of a PCB fixed between a standard WR-15 waveguide and a back-short with a simple structure and the same cross-section. The proposed transition also includes two through-holes on the PCB in the center of the transition area on either side of the probe. A significant part of the lossy PCB dielectric is removed from that area, thus providing wideband and low-loss performance of the transition without any additional matching elements. The design of the transition was adapted for implementation on the PCBs made of two popular dielectric materials RO4350B and RT/Duroid 5880. The results of full-wave simulation and experimental investigation of the designed waveguide to microstrip transition are presented. The transmission bandwidth for reflection coefficient S11 < –10 dB is in excess of 50…70 GHz. The measured insertion loss for a single transition is 0.4 and 0.7 dB relatively for transitions based on RO4350B and RT/Duroid 5880.Conclusion. The proposed method of insertion loss reduction in the waveguide-to-microstrip transition provides effective operation due to reduction of the dielectric substrate portion in the transition region for various high-frequency PCB materials. The designed waveguide-to -microstrip transition can be considered as an effective solution for interconnection between the waveguide and microstrip elements of the various millimeter-wave devices dedicated for the 60 GHz frequency range applications.
A Comparison of Text Classification Techniques Applied to Indonesian Text Dataset
Authors: Salamah Umniy 
Published: December 2019

In organization, statement contained opinion and complaint to a service or program by it organization. can be proceed using machine learning and the result can be used by organization to improve and enhance their quality. This research attempted to classify the reports from social media based on complaint and non-complaint using machine learning algorithm named Logistic regression (LR) and eXtreme Gradient Boosting (XGBoost). Logistic Regression model using CountVectorizer feature extraction and TfidfVectorizer. Moreover, the XGBoost algorithm uses multiple parameters so that it can be improved by tuning the parameters, i.e. eta or learning rate, gamma, max_depth, min_child_weight, subsample, colsample_bytree and alpha. As the result, the best value for XGBoost with parameter are 'reg_alpha': 0.01, 'colsample_bytree': 0.9, 'learning_rate': 0.5, 'min_child_weight': 1, 'subsample': 0.8, 'max_depth': 3, 'gamma': 0.0, in wich the computational time is 13870.012468 and the best accuracy that achieved is 0.927943760984. Furthermore, the performance evaluation results for Logistic Regression using TfidfVectorizer and CountVectorizer feature extraction are 0.9181 and 0.9356.
Phytochemical Profile of Aloe Barbadensis and their Proficiency in Defluoridation of Fluoride Contaminated Water
Authors: Manopradesh M. , Mathiyazhagan N. , Gajendiran K. , Muthusamy R. , Suresh K. , Selvam R. 
Published: December 2019

The quantitative analysis of acetone and ethanol extract of <em>Aloe barbadensis </em>were studied, the total flavonoid content was determined as 13 µg/ml in the acetone extracts of gel of the plant whereas in the ethanol extract, it was 30 µg/ml followed by total phenol content which was almost same in the extracts but found higher in acetone extract as 34 µg/ml it followed by ethanol extract as 32 µg/ml. The reducing power assay was determined as 480 µg/ml in the ethanol extracts, followed by, 400 µg/ml in acetone extract. When Carbohydrates were compared, it was found as higher in the ethanol extract of the leaves of about 58 µg/ml, whereas the acetone extract possessed 54 µg/ml of carbohydrates in the <em>Aloe barbadensis</em>. Ethanol extract of the gel found to easily absorb the carbohydrates easily compared to acetone. The proteins content of ethanolic extract was about 4.8 mg/ml followed by 4.2 mg/ml in the acetone extracts of leaves. In this test, acetone extract was observed to contain protein less than the ethanol. Unlike other tests, all the extracts of all the plant parts when measured showed more or less similar results of about 10 and 14.2 µg/ml of reducing sugars in the ethanol and acetone extracts of leaves. The DPPH activity in gel extract was observed to be present in both the extracts; higher activity was observed in ethanol 100 µl concentrations and acetone 50 µl concentrations. The <em>Aloe barbadensis </em>plant has found having some fluoride removal ability, helped in the fluoride removal process. As 20 ml concentration worked faster and better than the lower concentrations.
KEBERADAAN KEBUTUHAN EXISTENCE, RELATEDNESS, GROWTH, DALAM VIDEO GAME HARVEST MOON BACK TO NATURE
Authors: Budiman Arief 
Published: December 2019

ABSTRACT Playing video games is basically an activity where it must have an stimulus energy which is commonly referred to as motivation. Without motivation, player will not be interested in playing a video game with a long duration. The Harvest Moon Back to Nature video game as a video game that was quite successful, which made the video game a legendary video game for the audience's audience as early as 1997. Harvest Moon Back to Nature looks so strong in representating about social life of rural communities, especially one who works as a farmer. It creates interest which in turn encourages researchers to know more about how motivation for human needs is presented by the Harvest Moon Back to Nature video game. This research fundamentally use interpretative analytical descriptive method with narrative approach. Using a view from ERG theory Clayton Alderfer, which according to him motivation is related to basic human needs which consist of existence needs, relatedness needs, and growth needs. In increasing one's motivation, the three basic human needs must be fulfilled wherever possible. From the results of the research conducted using these instruments, it can be concluded that the power of motivation has been presented in the Harvest Moon Back to Nature video game from the fulfillment of existence needs, relatedness needs, and growth needs, both in the context events of farming, raising, and in carrying out other events.Keywords : motivation, existence needs, relatedness needs, and growth needs.
Moodle Cloud as the Developing Listening E-Learning Media in SMP Negeri 7 Medan
Authors: Dewi Nora Ronita , Hasibuan Juli Rachmadani , Siregar Masitowarni , Saragih Anggraini Thesisia , Darmawan Dicki 
Published: November 2019

The aim of this study was to develop listening media for Grade VII of Junior High School Students. This study was conducted by using Research and Development (R&D) design through six stages; gathering information and data, analyzing data, designing materials, validating by experts, revising, and final product. The subject of the study was Grade VII of SMP Negeri 7 Medan. The data were gathered by conducting interview to English teacher and distributing questionnaire to 1 class grade VII consists of 30 person to get the students’ needs. The interview and questionnaire results prove that the students needs English Listening Media which can motivate and encourage the students to speak actively in English. The product has been validated by experts. The result of the product was an E-learning media named Moodle Cloud and all the features which was categorized as an relevant media since the validation score of the media was 93.55%.
Method of Parents in the Development of Child Prayers Attention Deficit Hyperactivity Disorder (ADHD) (Case Study of ADHD Children in Kulam Kemukiman Syamtarail Village, North Aceh)
Authors: Muhajir  , Mubarrak Zahrul , Amiruddin  , Khaidir  , Saputra Fazil , Ridha Muhammad 
Published: November 2019

Concentration disorders accompanied by hyperactivity in children with ADHD are conditions that show symptoms of lack concentration, hyperactivity and impulsiveness that causes an imbalance of most of their life activities. This makes parents have difficulty in providing prayer guidance to children who have ADHD. Starting from this problem, the researcher tries to make a scientific about Parents' Method in the Development of Child Prayers Attention Deficit Hyperactivity Disorder (ADHD) (Case Study of ADHD Children in Kulam Kemukiman Syamtarail Village, North Aceh)." This study was conducted to describe the method parents in providing prayer services to children with ADHD in Kulam Kemukiman Syamtarail Village, North Aceh. This thesis research method uses the case study method which is a study that tries to examine individuals or a unit in depth with a qualitative approach. In collecting data researchers conducted observations and direct interviews within formants who have been used as samples, as well as documentation. While the analysis of data through observations in this thesis uses a theme analysis model technique where all data after being collected will be processed one by one. The results showed that ADHD children's prayer guidance involved all family members, namely the father, mother, siblings and cousins ​​of ADHD children. As for the methods carried out by the family in the guidance of prayers in children with ADHD can be concluded as follows:1. Intelegently; 2. Be haviour; 3. By monitoring.
Strategi Pengembangan Durian Wonosalam Agrowisata Jombang
Authors: Chusnah Miftachul , Sumardji Sumardji , Daroini Ahsin 
Published: December 2019

The purpose of this study is to identify the factors that influence and the right strategy in developing the Wonosalam durian agro-tourism area. The location of the study was carried out in the village of Wonosalam, Wonosalam District, Jombang City. This research was conducted for (two) months, namely between February - March 2019. The data used in this study are primary data and secondary data. Primary data is data taken directly from the research location of the Durian Wonosalam agrotourism area through direct observation at the site, interviews with the government, community shops, and filling out questionnaires. Respondents were selected by 20 people to fill out the research questionnaire as follows: Government (3 people), namely the Head of the device and the Office of Tourism Staff of Jombang (2 people) Community Stores (2 people), Tourist managers (3 people). And Visitors (10 people). Secondary data is data obtained through agencies related to this research, both tabulation and descriptive. The analytical methods used are SWOT and QSPM analysis. Based on the results of the research and discussion, it can be concluded that the alternative strategy for developing the right durian Wonosalam agro-tourism area is the SO Strategy, namely the strategy of agro-tourism development by maintaining the existing tourism power and development strategy by increasing promotion to related parties and outside regions through seminar seminars or utilizing technological developments the highest value of attraction is found in strategy 1 (SO) with total attractiveness (TAS) of 6.164. by exploring the potential and actions of tourism preservation that exist as a characteristic possessed by the Wonosalam region with a variety of attractions that are owned, Optimizing the superiority of tourism remains quality so as to attract tourists.
Non-Selective Magnetoelectric Thermal Radiation Receiver Based on Cadmium Antimonide
Authors: Dobrovolsky Yu. , Prokhorov G. , Ascheulov A. 
Published: December 2019

The ways of increasing the sensitivity of a non-selective thermal radiation receiver based on cadmium antimony using the phenomenon of electromagnetic induction are considered and investiga­ted. It has been shown that the application of ani­sotropic NdFeB anisotropic magnet increases the volt-watt sensitivity of the thermal radiation recei­ver by 30 %. When a more powerful magnet is used, an additional increase in sensitivity is observed, but not in proportion to the magnitude of the additio­nal magnetic induction. The dynamic range of the created thermal radiation receiver, which is from 10 to 200000 W/m-2, is investigated.
Effect of feeds with different crude fiber content on the performance of meat goose
Authors: Dobos Ádám , Bársony Péter , Posta János , Babinszky László 
Published: December 2019

In the last 50 years, poultry meat production has increased dynamically. The role of crude fiber content in feed is unclear based on a small amount of literature about goose feeding.
The aim of theis experiment was to determine how various crude fiber content (55; 60; 65g crude fiber/kg feed) influences the performance of meat geese in the second phase of the rearing period. 150 goslings (3 treatments, 5 cages/treatment, 10 birds/cage) were included in the test. The experiment started and finished at the age of 21st and 63rd day, respectively.
The obtained results suggest that various crude fiber content did not influence the performance of meat geese significantly; however, a feed of 55g crude fiber/kg resulted in better fattening results (final body weight, body weight gain, specific feed protein and energy conversion rate). In addition, compound feed of 65g crude fiber/kg proved more favourable with respect to cost-efficiency. Based on the obtained results so far, further models and farm experiments are required.
Génesis y evolución socio-histórica de la macro categoría cultura escrita
Authors: Borregales Lisbeth 
Published: December 2019

En este artículo se presenta un bosquejo socio-histórico de la génesis y evolución de la cultura escrita de la cual han emergido las propuestas pedagógicas para enseñar y aprender a escribir a lo largo del tiempo. Se trata de una investigación documental – analítica, mediante el cual se aborda desde de una visión holística, transdisciplinaria, cómo han evolucionado las teorías sobre la cultura escrita y la pedagogía sobre la escritura. Con el propósito de sistematizar la información sobre este tópico, de conocer la evolución de las teorías sobre los modelos de escritura y su impacto en la práctica docente. Por consiguiente se expone una descripción de los sistemas de escritura en sus contextos socio-históricos, sus usos, prácticas pedagógicas a fin de contribuir a una reflexión/acción que nos lleve al cambio del modelo tradicional de la enseñanza-aprendizaje de la lengua escrita por un modelo centrado en la pedagogía discursiva de la escritura.