bluuebunny/crossref_metadata_2025 huggingface dataset:
Designing Virtual Reading Room (VRR Digi_Litikon) for learning batik in Vocational High Schools: Curriculum material improvement
Authors: Widiaty I , Wahyudin D , Abdullah A G , Riyana C , Mubaroq S R
Published: December 2019

This study aimed at designing Virtual Reading Room (VRR Digi_Litikon) for learning batik in Vocational High Schools in Indonesia. The design was also a part of curriculum material improvement with the touch of information technology. As a web-based application, VRR Digi_Litikon saved all the contents and database on its server. It was also proven that it had frontend as its user interface. The user interface was also PHP-based with Code Igniter framework. The application was designed using Software Development Life Cycle (SDLC) method consisting of such phases as system engineering, analysis, design, coding/implementation, testing, and maintenance. The results of the application design were digital books equipped with scientific journal articles in relation to batik. The digital platforms designed for VRR Digi_Litikon enabled students to have information not only in a form of texts but also in audio/voices of the contents of a book they were learning. The application was tested in various devices and had been proven to be eligible to use as a learning media application particularly for learning batik in vocational high schools.
Virtual gallery as a media to simulate painting appreciation in art learning
Authors: Sugiarto E , Julia J , Pratiwinindya R A , Prameswari N S , Nugrahani R , Wibawanto W , Febriani M
Published: December 2019

The limited numbers of gallery buildings that display art works become an inhibitor in art appreciation learning. On the other hand, the development of digital-based media has not been widely used as an art learning media. This study aims to analyse the development of art students in studying the painting by using the virtual gallery as a learning media based on digital technology. The research design employed the following steps: (1) designing & preparing virtual gallery; (2) inputting some art works as a learning resources; (3) implementing virtual gallery for painting appreciation learning; and (4) evaluating the learning process. The research subjects were 20 students in the art department who were studying painting appreciation. The results showed that students’ ability in appreciating painting artwork had increased using virtual gallery as a digital-technology-based media. The improvement includes students’ ability in(a) knowing, (b) understanding, (c) analysing, and (d) assessing the artwork. Therefore, it can be concluded that media learning based on technology can simplify art learning, especially in painting appreciation processes.
Stress meter: Android-based assessment application for academic stress level of students
Authors: Ariffudin I , Rahmawati A I N , Mulawarman M
Published: December 2019

Academic stress is one of the negative emotional levels that can affect students’ physical, psychological, and academic health. Thus, there needs to be an assessment media that utilizes technological developments but can still evaluate academic stress levels effectively and efficiently. The purpose of this study was to develop an android-based assessment media (Stress Meter) that is able to measure students’ academic stress levels. This study used research and development methods. Data obtained were analyzed descriptively using Delphi technique for media acceptance test, and also Exploratory Factor Analysis test and Cronbach Alpha to test the validity and reliability of the instrument. The results of this study indicate that prototype of Stress Meter application has met the acceptability criteria and the instrument in it has passed the validity and reliability test. In conclusion, the prototype of Stress Meter application can be used by students as a media self-assessment and facilitate the performance of counselors in identifying the level of academic stress that students have.
Mobile learning contribution in improving the understanding of news item text generic structure
Authors: Nurwahidah L S , Julianto C D , Sahidin D
Published: December 2019

Mobile learning is a technological innovation that packs teaching material so it can be accessed any time with interesting material visualization. The use of interactive learning media has a major contribution to changes in the process of delivering information. This study aimed to represent the contribution of mobile learning in improving the understanding of the generic structure of the news item texts. The research method used in this study was the quasi-experimental method with Non-equivalent Control Group design. Questionnaire data collection techniques and tests were used to determine the effectiveness of Mobile Learning in improving the respondents’ skills to understand the generic structure of the news item texts. The increased understanding of the text could be known by analysing and classifying respondents’ understanding of the main events, the context of the event, and the sources of information contained in news item texts. The results of the study showed that the use of mobile learning was effective in conveying information so as to increase the understanding of respondents in understanding the generic structure of the news item texts. In the digitalization era, mobile learning can be used as a medium to convey knowledge and information in both formal and informal ways.
Development of web-virtual laboratory to improve the effectiveness and efficiency of remedial learning
Authors: Sriadhi S , Restu R , Sitompul H , Manurung J
Published: December 2019

The industrial revolution 4.0 demands universities to improve the quality of the graduates, while the competency standards have not yet been fully achieved. This study aims to build a virtual laboratory (V-Lab) as an independent practicum media through remedial learning. The development of V-Lab used the System Development Life Cycle (SDLC) model with the software Code Codeigniter and PHP 7.2, while the database used MySQL and PostgreSQL. The testing was done with Stub Testing, Unit Testing and inspection with Integration Testing for interactions between modules. The test results showed high feasibility in design, representation of user needs, reliability, security system, and the ease of the usage. The V-Lab is also able to increase the learning motivation of the students and have an impact on increasing student learning outcomes. While efficiency can be improved on the aspects of time flexibility, place of learning, facilities and cost savings because the learning is virtual. This study recommends V-Lab as an effective and efficient remedial learning through a virtual laboratory.
Application of K-medoids clustering method for grouping corn plants based on productivity, production, and area of land in East Java
Authors: Wibowo D W , Yunshasnawa Y , Setiawan A , Rohadi E , Khabibi M K
Published: December 2019

Corn plants has an important role in compliance national and international food needs after rice and wheat. According to Ir. Pending Dadih Permana, Director General of Food Infrastructure and Facilities (PSP) of the Ministry of Agriculture, East Java is one of province that the biggest corn producers in Indonesia. But it still cannot supply the increasing market needs in Indonesia. Therefore, it requires a grouping corn plants based on productivity, production, and area of land in East Java in order to increase level of procurement of corn plants in East Java. In process of grouping, it use K-Medoids algorithm. K-Medoids algorithm as known as Partitioning Around Medoids (PAM), which is variants of K-Means method. This is based on the use of medoids, not from observation of mean that owned by each cluster, with purpose reduce the sensitivity of partitions due to the extreme values in the dataset. This algorithm is an algorithm that can produce data that is not sensitive to outliers because one of object with some big value. These deviations can occur from data distribution. Based on the result of grouping corn plants based on productivity, production, and area of land which has been done, there are 3 clusters with at most 21 members, and at least 8 members. From this research, it can concluded that K-Medoids algorithm can help determine potential of the location of corn producing plants in East Java.
Self-directed learning analysis: A response of students using e-learning (SPOT-UPI)
Authors: Subekti S , Patriasih R , Ana A , Maosul A
Published: December 2019

Analysis of the use of SPOT in the process of learning in the Universitas Pendidikan Indonesia is very important, so that it can be known to what extent the use of SPOT can be used as self-directed learning for Students at the Universitas Pendidikan Indonesia, especially in Culinary of Education Study Program. In this study, data was collected from 61 student respondents in the Culinary of Education Study Program 2016 at the Universitas Pendidikan Indonesia using SPOT. The variables studied were the documentation process on SPOT, SPOT operation, and SPOT accessibility. The research instrument used in this study was a questionnaire. The results of data analysis can be explained that the use of SPOT as an application in the learning process is said to be very feasible seen from the results of processing observational data as much as 91.3%. The results of the observation data processing as much as 88.3% have been very feasible to operate the SPOT application used in the learning process. The feasibility of the results of the accessibility test on the use of SPOT by analysing the results of observations on students 80% is very feasible for the accessibility of the SPOT application used in the learning process. Utilization of SPOT as the implementation of ICT and learning tools can provide motivation to the students, because the range is in a very broad SPOT. Interaction between teacher and students can take place anytime and anywhere, not limited by time. In addition to the teacher and students can monitor the progress of the learning process that lasted one semester. However, this study requires special skills of teacher and students because they are required to master a variety of applications associated with the Internet.
Design of monitoring application for cathodic protection using data acquisition data module
Authors: Mulyana E , Ihsan F K , Ismail K , Supriadin A , Sudiarti T , Kamelia L
Published: December 2019

The impressed current cathodic protection is one of the effort to prevent a metal from corrosion by supplying electricity to metal objects. However, the protection system that supplies electricity must always be monitored so that the electricity intake to the metal object is sufficient to protect it from the corrosion. The way how to monitor the electricity intake to the metal is to read the current in taking on the metal. To read the electric current more easily is to use an application software. This research talks about the application design to display the electric current in taking on the metal through the computer screen. In order to read the electric current directly, the Advantect Data Acquisition Modul (ADAM) devices are used. The results show that the application is able to display the value of protection current for iron plate steel with size 30x10 cm are between 0.15 A to 0.18 A while for iron plate with a size of 30x13 cm are between 0.20 to 0.24 A. These values also avoid the over protection.
Testing the performance of a single pole detection algorithm using the confusion matrix model
Authors: Yusro M , Suryana E , Ramli K , Sudiana D , Hou K M
Published: December 2019

This study aims to examine the single pole detection algorithm using a confusion matrix model which is a specific table that makes it easy to visualize the performance of an algorithm. The algorithm tested is the YuRHoS pole detection algorithm, a new algorithm developed by researchers to detect pole objects with not poles. Methods used is by calculating three aspects of algorithm performance in machine learning, namely sensitivity, specificity, and accuracy. The value of the three aspects of performance depends on four variables, namely true positive, true negative, false positive and false negative. The calculation process is done by matching the pixel detection region with the ground-truth region. The test results for 4 (four) different single pole images found that the YuRHoS pole detection algorithm is better than other algorithms on two measurement aspects, namely specificity, and accuracy. Excellence aspects of specificity obtained because of its ability in detecting the object instead of a pole. Excellence aspects of accuracy indicated because more accurate in detecting a pole. As for sensitivity aspects, both the detection algorithms are having the same reliability in correctly predicting a pole.
Correlation underwriter, auditors, profitability and company sizes on stock underprizing by Information Communication Technology (ICT) based learning
Authors: Mamase A R Y , Pratama N U , Mursalin A , Rizal M F , Niswan E , Ellyta E , Utomo S , Muharlisiani L T
Published: December 2019

The purpose of this research are two-fold, first to analyse correlation of underwriter, auditor, profitability and company size on stock underprizing and second, also to know the student learning outcomes through the implementation of ICT based learning in the subjects of stock underprizing. The method used is quantitative research, the follow up data analysis used is multiple regression. The results showed that the three independent variables consisting of underwriter reputation (X1), auditor reputation (X2) and profitability (X3) had a negative effect and only company size (X4) had a positive effect towards the dependent variable namely stock underprizing (Y) with the regression equation Y = 29.760 – 10.011X1 – 11.812X2 – 0.512X3 + 0.366X4 + e and sig value X1 = 0.040, X2 = 0.103, X3 = 0.088 and X4 = 0.750. Thus, its mean that only underwriter has influence toward stock underprizing and a good performance of underwriter can decrease the stock underprizing. This research is Classroom Action Research (CAR) was conducted in two cycles of learning with the stages in each cycle includes planning, action, observation and evaluation, and reflection. Student response data collected through questionnaires/questionnaires. Collected data was then analysed descriptively. The results showed average student learning outcomes before the action amounted to 68.81, after the first and second cycle outcomes increased to 88.70 and 88.00.
ICMLS version 3.0 as a prototype of bio-communication model for revolutionary human numerical competences on vocational education practices
Authors: Darmawan D , Kiyindou A , Pascal C
Published: December 2019

The research focusing on the development of “ICMLS version 3.0 (Integrated Communication Mobile Laboratory Simulator)” is a study that aims to produce human learning innovations that have shifted from Human Communication to Human Numerical. Prototype ICMLS 3.0 has integrated artificial intelligence with aspects of creativity supported by a model of findings of Bio-communication. Through R & D research and development methods, ICMLS version 3.0 products are produced through the support of industrial partners so that the quality and quantity can be felt by all SMKs in the world. This Prototype can accommodate practicum and student competency test. The results of the experimental results of Vocational students from 8 Vocational Schools have been shown to increase the average student competency test in 10 competency tests from 75.13 to 85.53.
Teaching material development of natural environment based on mobile learning on elementary school
Authors: Hardiansyah H , Rusmono R , Winarsih M
Published: December 2019

Education and technology must go together in this millennium. This study aims to develop mobile learning-based teaching materials for thematic learning in elementary schools. This study uses research and development methods with the Dick and Carey model. The instruments used in this study were interviews, questionnaires, and tests. The results of this study are teaching materials based on mobile learning. Based on the results of the pre-test and post-test analysis, it shows that there are differences in learning outcomes between the pre-test and post-test stages. The results of the t-test show that t count = 12.10 and t table = 1.99 at the significance level α = 0.05 / 95%. Thus it can be concluded that there is an increase in learning outcomes experienced by students, after participating in thematic learning with teaching materials based on mobile learning.
Effect of teaching material based on mobile learning to learning outcomes of natural environment
Authors: Rusmono R , Winarsih M , Hardiansyah H
Published: December 2019

Learning materials that are integrated with technology are currently being used. This study aims to determine the effect of mobile learning-based teaching materials on student learning outcomes in thematic learning in elementary schools. This study uses an experimental method with a 2x2 level treatment design, to answer the question of how the influence of mobile learning-based teaching materials for elementary schools. The results showed that there were significant changes to the learning outcomes of students after using mobile learning-based teaching materials, compared to using conventional teaching materials. Thus it can be concluded, that teaching materials based on mobile learning can affect the learning outcomes of elementary school students.
Effect of perceived ease of use of ICT on stakeholder service quality in Vocational High School in West Java
Authors: Daryanto D , Rina F , Massus S , Siswantari S
Published: December 2019

The use of Information and Communication Technology (ICT) for school management is very helpful in providing services to students and other stakeholders. ICT as a technology can be useful if used to improve its performance. Whereas someone will use technology to assist in completing his work if he feels that the technology is easy to use. A person’s perception of existing technology will encourage the use of this technology in its work. This study aims to examine the effect of perceptions of ease of use of ICTs on service quality in vocational high schools in West Java. The method used in this study is a causal survey. Sampling in this study used proportional random sampling technique with a total sample of 248 respondents. The research data were analysed using path analysis with the Partial Least Square (PLS) approach. The results of this study indicate that the perception of ease of use of ICT indirectly affects the quality of stakeholder services in Vocational High Schools in the West Java Region.
How influential the mathematical disposition of mathematical communication skills is? (the evaluation of middle school students)
Authors: Minarti E D , Wahyudin W
Published: December 2019

This study aims to examine the effect of mathematical disposition of junior high school students on mathematical communication skills. This study used a correlation method with a quantitative approach. The subjects in this study were 31 student which is the eighth grade at one of the junior high schools at Bandung. The instrument used consists of a test instrument which is a test of mathematical communication skills with the indicator is forming a mathematical model; arguments based on analysis of images and concepts; and the appearance of conceptual models, such as images, diagrams, tables and graphs and non-test instruments in the form of questionnaires about students’ mathematical dispositions. The results of the study show that the mathematical disposition of junior high school students has a positive influence on mathematical communication skills. Students’ mathematical communication skills are influenced by mathematical dispositions of 74.5% and 25.5% influenced by other factors beyond students’ mathematical dispositions. This shows that the relationship between students’ dispositions and its mathematical communication skills is strong enough. Students who have a positive disposition towards mathematical learning tend to be active and can express ideas well.
Drawing graph of quadratic functions: what affects it?
Authors: Sumartini T S , Maryati I , Noordiyana M A , Sritresna T , Basuki B
Published: December 2019

The quadratic function of the part of mathematics that is dynamic. This gives the meaning that drawing graphs of quadratic functions can use a variety of different ways. The purpose of this study is to find out what underlies a person in solving mathematical problems in different ways. Sampling was done by purposive sampling with two respondents who had learned quadratic function material. The study was conducted qualitatively by analyzing the way respondents in the presentation of graphs of quadratic functions. The results showed that the effectiveness of drawing graphs of quadratic functions is influenced by the ability to think creatively. This implies that it is necessary to develop creative thinking skills in the educational environment.
Linear Algebra on investment portfolio optimization model
Authors: Basuki B , Sukono S , Sofyan D , Madio S S , Puspitasari N
Published: December 2019

In this paper we discuss the issue of linear algebra on the investment portfolio optimization models. It was assumed that stock returns are analyzed have a certain distribution, so that the mean and variance and covariance between the separation can be determined. Return of some stock used to form a vector averaging, and the number of shares used as the basis to form a unit vector. While the variance of each stock as well as the covariance between stocks, is used to form a covariance matrix. The investment portfolio was formed consisting of several stocks, in order to maximize the expected return and minimize risk. The portfolio optimization was performed using linear algebra approach. The result is a formula used to determine the optimum composition of the portfolio weights. The resulting formula is very useful for the analysis of the investment portfolio optimization.
The comparative analysis of Hungarian assessment, matrix ones assignment and alternate mansi method in solving assignment problem
Authors: Wulan E R , Devi A R , Nuraiman D
Published: December 2019

This paper discusses about the comparison of the three methods in the assignment that is the Hungarian Method, Matrix Ones Assignment, and Alternate Mansi Method. The Hungarian methods determine penalties in every row and column by decrease the smallest or largest point in row and column. The Matrix Ones Assignment determine penalties, divide minimum or maximum point in every row and column. The Alternate Mansi Method find the minimum or maximum value in each row that has unique value relate with the column. The concept of this problem is applied to car manufacturing company, with balanced data. While University Port Harcourt Project, using unbalanced data. Thus, it can be concluded that the Hungarian method is the most optimal.
Modelling of the number of malarias suffers in Indonesia using Bayesian generalized linear models
Authors: Santi V M , Kurnia A , Sadik K
Published: December 2019

Generalized Linear Models (GLM) has been used for modelling various types of data where the distribution of response variables is an exponential family. Common examples include those for binomial and Poisson response data. The GLM regression model determines the structure of the explanatory variable or covariate information, where the link function specifically determines the relationship between the regression model and the expected value of the observation. Bayesian techniques can now be applied to complex modelling problems where they could not have been applied previously. This method is a simpler model than traditional frequentist techniques. Estimating the regression model parameters is done by using Bayesian GLM. In this paper, we study conducted modelling for the number of dengue sufferers in Indonesia using the Bayesian GLM approach with several prior distributions. There are 6 independent variables that have a significant effect on the regression model, that is population density, Gini ratio, proper sanitation access, healthy zoning, integrated control and total sanitation. Based on Akaike Information Criterion (AIC) and standard error, the Bayesian GLM estimation results for Cauchy and Normal prior distribution will converge to the same value as that obtained by GLM.
Wingeom program in geometry
Authors: Noordyana M A , Maryati I , Sumartini T S , Sofyan D , Sundayana R
Published: December 2019

Wingeom program is a mindtool to solve geometry problems. It is used to develop dimensional geometry frameworks. The program can help visualize geometric concepts so clearly that respondents will understand geometry concepts effortlessly. Driven by this expediency, this design base research was carried out in three stages; what to learn, how to learn, when to learn, monitor the ongoing process and evaluate what has been planned, done, and the results of the process. This research is expected to be an alternative and solution in overcoming difficulties in understanding the Geometry concepts. Five respondents were selected to participate in this study. The results of the study showed that the respondents were able to explore, observe, and perform animated images and dimensional geometry material.
On the total vertex irregularity strength of comb product of cycle and path with order 3
Authors: Ramdani R , Ramdhani M A , Delilah G G A
Published: December 2019

Let G = (V (G),E(G)) be a graph and k be a positive integer. A total k-labeling of G is a map f:
V (G) ∪ E(G) → {1, 2,…,k}. The vertex weight v under the labeling f is denoted by wf(v) and defined by wf(v) = f(v) + ∑ υν∈E(G)f(ν∈). A total k-labeling of G is called vertex irregular if there are no two vertices with the same weight. The total vertex irregularity strength of G, denoted by tvs(G), is the minimum k such that G has a vertex irregular total k-labeling. Let G and H be two connected graphs. Let o be a vertex of H. The comb product between G and H, denoted by G⊳o
H, is a graph obtained by taking one copy of G and |V (G)| copies of H and grafting the i-th copy of H at the vertex o to the i-th vertex of G. In this paper, we determine the total vertex irregularity strength of comb product of cycle and path with order 3.
Analysis of normality of quotient subgroups on matrices integers modulo prime
Authors: Hadi I , Kharis S A A
Published: December 2019

A set of matrices integers modulo prime forms a finite group. This group has trivial and nontrivial subgroups. The trivial subgroup is normal and for a non-trivial subgroup the normal properties will be investigated. Furthermore, if a nontrivial subgroup is a normal subgroup, then a quotient subgroup can be constructed. This paper discusses the characteristics of normality of quotient subgroup on matrices integers modulo prime. By study of literatures, the order of group play an important role in this quotient subgroup. We derive some characteristics of normality of quotient subgroup. The result is that the order of subgroup determine on the normality of a quotient subgroup.
Analysis of the mathematical learning materials with the characteristics of realistic mathematics education in the design research pre-service teachers’ theses in Indonesia
Authors: Sampoerno P D , Meiliasari M
Published: December 2019

This study focuses on analysing the theses of Mathematics Education Study Program especially the Design Research (DR) types to find out the relationship between mathematics learning materials with the characteristics of Realistic Mathematics Education (RME). DR is a research methodology aiming to develop local instructional theory. The emphasis of DR is on the process of designing and conducting instructional activities, also known as the Hypothetical Learning Trajectory. The relational analysis used in this study is error analysis. We observed and described alignment between the mathematical concepts, the instructional activity and the characteristics of RME in the DR theses. Using the relational understanding framework, we analysed 36 DR theses. The finding showed that some theses developed instructional activities which were not well-aligned with the mathematical concept taught, hence the relational understanding was not achieved. However, we also found that some theses developed instructional activities that were appropriate with the mathematical concept. In such cases, the students’ relational understanding was achieved, and their mathematics learning outcomes were increased.
The effect of weights observation to estimate the monitoring control point coordinate at sermo dam
Authors: Affriani A R , Widjajanti N , Yulaikhah Y
Published: December 2019

The use of weights observation was effected on the estimation of coordinates and its precision. This research aims to identify 3D coordinates and its precision using weights observation from the result of GAMIT processing and the law of error propagation in sequential adjustment method. This research uses GNSS observation data from 10 deformation monitoring control points around Sermo Dam that was measured on doy 250 in 2014 and doy 129 in 2015. Data processing was performed by GAMIT software to get a baseline length and its precision. Baseline length and its precision were used as input in the sequential adjustment method. The values of weight observation were calculated using the result of GAMIT processing and the law of error propagation. The result of this research are 3D coordinates control point and its precision. The coordinate results using weight observation from GAMIT result does not significantly different from the law of random error propagation result, whereas the precision result is different significantly. The differences of precision reached 2 centimetres.
Covariant stochastic products of quantum states
Authors: Aniello Paolo
Published: December 2019

A notion of stochastic product of quantum states — a binary operation on the set of density operators preserving the convex structure — is discussed. We describe, in particular, a class of group-covariant, associative stochastic products: the twirled products. Each binary operation in this class can be constructed by means of a square integrable projective representation of a locally compact group, a probability measure on this group and a fiducial density operator in the Hilbert space of the representation. By suitably extending this operation from the convex set of density operators to the full Banach space of trace class operators, one obtains a Banach algebra, which is commutative in the case where the relevant group is abelian.
Darboux transformation and soliton solution for generalized Konno-Oono equation
Authors: Bekova G , Shaikhova G , Yesmakhanova K , Myrzakulov R
Published: December 2019

In this paper, the generalized Konno-Oono equation is investigated. Using the Lax pair, we obtain a new Darboux transformation for the dispersionless equation. A soliton solution of the generalized Konno-Oono equation is obtained on the basis of the Darboux transformation. Corresponding graphs are also built.
Dynamical generation of flavor vacuum and Lorentz invariance
Authors: Blasone M , Jizba P , Smaldone L
Published: December 2019

In this paper we review dynamical generation of field mixing after chiral symmetry breaking. We also study the explicit form of Lorentz boosts transformations of flavor states in a two-flavor scalar model with field mixing. We find that Lorentz symmetry is spontaneously broken on flavor vacuum because of its dynamically generated condensate structure.
On the status of pointlike fields in integrable QFTs
Authors: Bostelmann Henning
Published: December 2019

In integrable models of quantum field theory, local fields are normally constructed by means of the bootstrap-formfactor program. However, the convergence of their n-point functions is unclear in this setting. An alternative approach uses fully convergent expressions for fields with weaker localization properties in spacelike wedges, and deduces existence of observables in bounded regions from there, but yields little information about their explicit form. We propose a new, hybrid construction: We aim to describe pointlike local quantum fields; but rather than exhibiting their n-point functions and verifying the Wightman axioms, we establish them as closed operators affiliated with a net of local von Neumann algebras that is known from the wedge-local approach. This is shown to work at least in the Ising model.
Discretization of Generalized Chebyshev Polynomials of (Anti)symmetric Multivariate Sine Functions
Authors: Brus Adam , Hrivnák Jiří , Motlochová Lenka
Published: December 2019

The multivariate antisymmetric and symmetric trigonometric functions allow to generalize the four kinds of classical Chebyshev polynomials to multivariate settings. The four classes of the bivariate polynomials, related to the symmetrized sine functions, are studied in detail. For each of these polynomials, the weighted continuous and discrete orthogonality relations are shown. The related cubature formulas for numerical integration together with further model examples and properties of selected special cases are discussed.
Beyond coherent state quantization
Authors: Gouba Laure
Published: December 2019

We present an original approach to quantization based on operator-valued measure that generalizes the so-called Berezin-Klauder-Toeplitz quantization, and more generally coherent state quantization approches.
Worldsheet Instanton Corrections to Five-branes and Waves in Double Field Theory
Authors: Kimura Tetsuji , Sasaki Shin , Shiozawa Kenta
Published: December 2019

We study string winding corrections to supergravity solutions in double eld theory (DFT). We nd ve-brane and wave solutions of diverse codimensions where the winding coordinates dependence is interpreted as string worldsheet instanton corrections. In order to show this fact, we give a brief discussion on the origin of these winding corrections in gauged linear sigma models (GLSMs). We propose a GLSM that provides a string sigma model whose target spaces are a defect NS5-brane, a Kaluza-Klein vortex and an exotic 52
2-brane. They are codimension two objects and are related by T-duality. This contribution is based on the works [1, 2].
Open problems in the Kontsevich graph construction of Poisson bracket symmetries
Authors: Kiselev Arthemy V
Published: December 2019

Poisson brackets admit infinitesimal symmetries which are encoded using oriented graphs; this construction is due to Kontsevich (1996). We formulate several open problems about combinatorial and topological properties of the graphs involved, about integrability and analytic properties of such symmetry flows (in particular, for known classes of Poisson brackets), and about cohomological, differential geometric, and quantum aspects of the theory.
Soliton solutions of logarithmic wave equation and their application for polycrystalline metals
Authors: Kraiev M , Domina K , Kraieva V , Zloshchastiev K G
Published: December 2019

Wave equations with logarithmic nonlinearity are applied to Korteweg-type materials which can undergo liquid-solid or liquid-gas phase transitions. One of predictions of the theory is a periodical pattern for inhomogeneities of density, which can occur in the form of bubbles or cells. Such inhomogeneities are described by soliton and solitary wave solutions of the logarithmic wave equation in the vicinity of a liquid-solid phase transition. During the solidification process, these inhomogeneities become centers of nucleation of grains. Previous works were dealing with generic natural silicate materials in geophysics, such as magmas in volcanic conduits, where the (approximately) periodical flows and structures were observed. Here we report an experimental evidence of a large-scale periodicity in structure of grains in the structural steel S235/A570 Grade 36, copper C-Cu/C14200, stainless steel X10CrNiTi18-10/AISI 321, and aluminium-magnesium alloy 5083/5056.
Thermodynamics of AdS5 black holes: holographic QCD and Stückelberg model
Authors: Megías Eugenio
Published: December 2019

We explore the thermodynamics of AdS5 black holes in two models: i) an improved holographic QCD model with a simple dilaton potential, and ii) the Stückelberg model in 5D. In the former case, by applying techniques of singular perturbation theory, we obtain a resummation of the naive expansion at high temperatures, providing a good fit to the lattice data for the trace anomaly. In the latter, we find a solution of the equations of motion by considering an expansion in the conformal dimension of the current associated to the gauge field.
Scalar particle with Darwin-Cox structure in external Coulomb field
Authors: Ovsiyuk E M , Koral’kov A D , Chichurin A V , Voynova Ya A , Red’kov V M
Published: December 2019

Generalized Klein-Fock-Gordon equation for a scalar particle with Darwin-Cox structure, which takes into account distribution of electric charge of the particle inside a finite spherical region is studied in external Coulomb field. Corresponding radial equation has two irregular singular points, r = 0 of the rank 3, r = ∞ of the rank 2, and four regular singular points. In the case of minimal angular momentum, l = 0, the structure of singularities becomes simpler: the points r = 0, r = ∞ are both of the rank 2, and four regular points remain the same. There are constructed formally exact Frobenius type solutions of the derived equations, convergence of relevant power series, with 8-term and 7-term recurrent relations respectively, is studied. As analytical quantization rule is taken so-called transcendence conditions. It provides us with 4-th order algebraic equation with respect to energy values, which has four sets of roots. Only one set of roots, 0 < El,k < 1, depending on angular momentum l = 0, 1, 2, … and main quantum number n = 0, 1, 2, … may be interpreted as corresponding to some bound states of the particle in the Coulomb field. In the same manner, a generalized nonrelativistic Schrödinger equation for such a particle was studied, the final results are similar.
Symmetries in the projection evolution model
Authors: Aleksandra P¸edrak , Andrzej Góźdź , Marek Góźdź
Published: December 2019

Some introductory results concerning symmetries and conservation laws within the Projection Evolution (PEv) formalism are presented. It is shown that the PEv formalism conserves the quantum probability distributions after unitary transformations of the evolution operators represented by the orthogonal resolution of unity. Some conditions for transformations selecting the states with equal transition probabilities are found. A relation between a given symmetry represented by a Lie group and PEv conservation of the eigenvalues of the Casimir operator is derived.
Blocks in the category of finite-dimensional representations of principal W-algebra for Q(2)
Authors: Poletaeva Elena
Published: December 2019

We describe the blocks in the category of nite-dimensional representations of the principal nite W -algebra for the Lie superalgebra Q(2).
Slightly generalized Maxwell system and longitudinal components of solution
Authors: Simulik Volodimir , Gordievich Igor , Zajac Taras
Published: December 2019

We consider slightly generalized Maxwell equations with electric and magnetic currents and charges densities of the gradient type. Among other versions of the Maxwell system these equations differ by the extended symmetry properties. Such system of equations is invariant with respect to a 256-dimensional algebra, and this algebra is not yet the maximum of possible symmetry. The longitudinal components of both vectors of electric and magnetic field strengths, together with two corresponded scalar waves, are found as the exact solution of such generalized Maxwell equations. The longitudinal wave component of the electric field strength vector itself is found as an exact solution of the standard Maxwell equations with fixed current and charge of the gradient type. This wave is corresponded to the scalar wave component, which is propagated in the same direction. The analysis of found solutions demonstrates that longitudinal components are located near the corresponded current and charge densities, which are the sources of such fields. The relationship with modern experiments is considered briefly.
Hidden symmetries of relativistic hydrogen atom
Authors: Simulik Volodimir , Gordievich Igor
Published: December 2019

The spin s=(1,0) Bose symmetry of the Dirac equation for the free spinor field, proved recently in our papers, is extended for the Dirac equation interacting with external Coulomb field. Relativistic hydrogen atom is modeling here by such Dirac equation. We are able to present both the fermionic and bosonic symmetries known from our papers about the case of non-interacting spinor field. New symmetry operators were found on the basis of new gamma matrix representations of the Clifford and SO(8) algebras, which were found recently in our papers. Hidden symmetries were found both in the canonical Foldy-Wouthuysen and in the covariant Dirac representations. The symmetry operators, which are simple and graceful in the Foldy-Wouthuysen representation, become non-local in the Dirac model.
Spin transport in a rippled graphene periodic chain
Authors: Smotlacha Jan , Pudlak Michal , Nazmitdinov Rashid G.
Published: December 2019

We discuss the solution of the scattering problem of ballistic electrons on the finite periodic chain. Each element of this chain is composed of a combination of a planar and rippled graphene elements. The analysis is carried out in the effective mass approximation when only the interaction between nearest neighbour atoms is taken into account. We find that, with the increase of number of elements, the chain becomes more transparent for electrons with spin up travelling in one direction and for electrons with spin down travelling in the opposite direction.
A new concept of QM-models and truth in quantum mechanics (QM), the new hybrid-epistemic model of QM and its observer independence, the proof of the invalidity of no-go theorems
Authors: Souček Jiří
Published: December 2019

We define a concept of a QM-model. The true theorem in QM is a statement which is true in all QM-models. In some QM-models the Bell’s theorem can be proved (e.g. in the standard model of QM) while in other QM-models the Bell’s theorem cannot be proved (e.g. in the hybrid-epistemic model of QM). The same situation is true when other no-go theorems are considered. Thus no-go theorems are not true in QM and the proof of the non-locality of QM is invalid.

Then the axiomatic definition of the hybrid-epistemic (HE) model of QM is presented in all details. At the end the recent proof of the inconsistency of the standard QM-model is discussed.

Our main program is to start the axiomatic study of QM (in the sense of the Hilbert’s sixth problem), to prove the invalidity of no-go theorems and to identify the right (acceptable) QM-model.
Soliton surfaces induced by the Fokas-Lenells equation
Authors: Yesmakhanova Kuralay , Zhassybayeva Meruyert , Myrzakulov Ratbay
Published: December 2019

In this paper, we study the application of the theory of solitons in differential geometry. The recently proposed soliton equation, which is Fokas-Lenells equation, has been investigated, and its two-dimensional soliton surface in the three-dimensional Euclidean space (R2
! R3) has been constructed. Thus the connection between the Fokas-Lenells equation and the surface was established by using the Sym-Tafel formula. We find the first and the second quadratic forms, surface area, and Gaussian curvature. The obtained results have various applications in mathematical physics, the geometry of curves and the theory of surfaces.
Testosterone and semen seasonality for the sand tiger shark Carcharias taurus†
Authors: Wyffels Jennifer T , George Robert , Adams Lance , Adams Cayman , Clauss Tonya , Newton Alisa , Hyatt Michael W , Yach Christopher , Penfold Linda M
Published: December 2019

Understanding the fundamental reproductive biology of a species is the first step toward identifying parameters that are critical for reproduction and for the development of assisted reproductive techniques. Ejaculates were collected from aquarium (n = 24) and in situ (n = 34) sand tiger sharks Carcharias taurus. Volume, pH, osmolarity, sperm concentration, motility, status, morphology, and plasma membrane integrity were assessed for each ejaculate. Semen with the highest proportion of motile sperm was collected between April and June for both in situ and aquarium sand tiger sharks indicating a seasonal reproductive cycle. Overall, 17 of 30 semen samples collected from aquarium sharks from April through June contained motile sperm compared to 29 of 29 of in situ sharks, demonstrating semen quality differences between aquarium and in situ sharks. Sperm motility, status, morphology, and plasma membrane integrity were significantly higher (P < 0.05) for in situ compared to aquarium sand tiger sharks. Testosterone was measured by an enzyme immunoassay validated for the species. Testosterone concentration was seasonal for both aquarium and in situ sharks with highest concentrations measured in spring and lowest in summer. In situ sharks had higher (P < 0.05) testosterone concentration in spring than aquarium sharks. This study demonstrated annual reproduction with spring seasonality for male sand tiger sharks through marked seasonal differences in testosterone and semen production. Lower testosterone and poorer semen quality was observed in aquarium sharks likely contributing to the species’ limited reproductive success in aquariums.
Homozygous mutation of foxh1 arrests oogenesis causing infertility in female Nile tilapia†
Authors: Tao Wenjing , Shi Hongjuan , Yang Jing , Diakite Hamidou , Kocher Thomas D , Wang Deshou
Published: December 2019

Foxh1, a member of fox gene family, was first characterized as a transcriptional partner in the formation of the Smad protein complex. Recent studies have shown foxh1 is highly expressed in the cytoplasm of oocytes in both tilapia and mouse. However, its function in oogenesis remains unexplored. In the present study, foxh1−/− tilapia was created by CRISPR/Cas9. At 180 dah (days after hatching), the foxh1−/− XX fish showed oogenesis arrest and a significantly lower GSI. The transition of oocytes from phase II to phase III and follicle cells from one to two layers was blocked, resulting in infertility of the mutant. Transcriptomic analysis revealed that expression of genes involved in estrogen synthesis and oocyte growth were altered in the foxh1−/− ovaries. Loss of foxh1 resulted in significantly decreased Cyp19a1a and increased Cyp11b2 expression, consistent with significantly lower concentrations of serum estradiol-17β (E2) and higher concentrations of 11-ketotestosterone (11-KT). Moreover, administration of E2 rescued the phenotypes of foxh1−/− XX fish, as indicated by the appearance of phase III and IV oocytes and absence of Cyp11b2 expression. Taken together, these results suggest that foxh1 functions in the oocytes to regulate oogenesis by promoting cyp19a1a expression, and therefore estrogen production. Disruption of foxh1 may block the estrogen synthesis and oocyte growth, leading to the arrest of oogenesis and thus infertility in tilapia.