bluuebunny/crossref_metadata_2025 huggingface dataset:
A Cross-cultural Comparison of Chinese and American Tourists’ Satisfaction with Chengdu
Authors: Liu Xueqian
Published: April 2021

Compared with China’s domestic and outbound tourism, China’s inbound tourism has developed relatively slowly. An understanding of cultural similarities and differences can support destination managers in formulating strategies and increase the satisfaction of inbound tourists. As one of the best tourist cities in China, Chengdu is an important destination for inbound tourists. Meanwhile, American tourists are the major source of tourists for Chengdu’s inbound tourism. Based on the Cultural Dimensions Theory proposed by Hofstede, this research focuses on a cross-cultural comparison of two important markets for Chengdu tourism: Chinese and American tourists. In addition, electronic word-of-mouth (E-WOM) has become an important source of tourist information, the analysis of E-WOM may provide more insights into users’ feelings than questionnaires. This study uses content analysis to quantify online reviews and importance performance analysis to compare the importance and satisfaction of Chinese and American tourists with destination attributes. The results clearly show the comparison between the two groups in destination assessment.
Tourists Perceived Value of Forest Experience Base Recreation Based on Fuzzy Entropy Weight
Authors: Jin Yi-Tian , Chen Li-Ming
Published: April 2021

This paper constructs a formula for measuring the tourists perceived value index of forest experience base recreation on five dimensions: Scenic resource attachment, Forest cultural experience, Environmental quality perception, “Two mountains” concept identity, and leisure time activities. Taking Bamboo Expo Park Forest Experience Base in Tianhuangping Town, Anji County, Huzhou City of Zhejiang Province as an example, a comprehensive evaluation method based on fuzzy entropy weight is used to evaluate and analyze the tourist perception value index of the Bamboo Expo Park Forest Experience Base recreation. Research shows that the tourist’s perceived value index of the base for recreation is 90.92, revealing that the tourist’s perceived value is roughly 10% off the Bamboo Expo Park Forest Experience Base ticket price.
Research on the Theory of Artistic Works Innovation System and the Realizable Mode
Authors: Cheng Shuolei
Published: April 2021

This paper puts forward the concept of art innovation system and the system model of art creation process. On this basis, it analyzes the basic characteristics of art innovation system by using the principle of finite optimization, and establishes the operation mechanism of art innovation system based on the characteristics of uncertain attributes. At the same time, it is pointed out that the essence of artistic design innovation is to increase the optimum attributes of the work and reduce the non-optimum attributes of the work, and the operation process of this innovation system is also a learning process. Research shows that artistic innovation is the realizability of new ideas and new models, which depends on the target demand for artistic works and the realization degree of the new demand for works. Moreover, the artistic innovation system has the functions of self-organization, self-learning and self-realization, and the practical wisdom of artistic works creation is the key to the establishment of the innovation system.
A Reflection on the Phenomenon of “argot” in linguistic view of landscape of Macao Shop
Authors: Suzhen Lin , Guiping Qin
Published: April 2021

the landscape of Macao shops is first architectural symbol, which has the significance of design, then landscape symbol, which has geographical significance, and also public regional symbol, which has sociological significance. No matter which kind of symbol, in the final analysis, the essence is the collection of symbolic elements, first manifested as language symbols, then is the political, economic, cultural, educational and other multi-element word-formation, and finally affect its written writing style and communication mechanism is comprehensive and pluralistic. This paper expounds the phenomenon of “argot” in the language landscape of Macao shops from the aspects of folk culture, industry linkage and resource particularity, hoping to arouse more thinking about Macao’s language landscape. It also hopes to provide some strategic thinking for changing the “single economic structure” mentioned in the outline.
Cyberspace Narratives for Global Interconnectivity Based on Content Analysis of Financial Media in Comparison
Authors: Piao Jingwei , Su Yancong
Published: April 2021

The paper explores the role of elite financial media in construction narratives of global interconnectivity, in a comparative framework[7]. The existing era of globalization provided us with new challenges for strategic intelligence as the virtual compression of time along with new technological achievements in shorter period of time and potentially cataclysmic threats[8]. Two globally circulated financial journals—Caijing, China’s leading financial news organization, and the Economist, with a vital influence across the globe—are chosen to manifest the diverse media discourses representing, respectively, the Chinese and Anglo-American socio- economic backgrounds. The paper aims to use the quantitative content analysis to answer the question: what are the narrative characteristics of the Caijing and the Economist in portraying China’s economic globalisation? The study are designed to tackle a specific focus on the globalised elite communication, in order to guide the investigation of China’s global interconnectivity in a hybridizing and contesting way[4]. Like other forms of mediated electronic connectivity, the Internet instead of circumscribing sovereignty has offered centralised authority new ways of conducting statecraft, by circulating ideas that represents the consensus shared by global elites.
About the Application of Computer Technology in Internet Finance -- based on the Analysis of the Impact of Venture Capital on Capital Overoffering of listed Companies in Financial Investment
Authors: Zhou Shixin
Published: April 2021

With the further development of computer technology, the era of Internet finance has arrived. Computer technology plays an important role in promoting the development of Internet finance and has also become an important basis for the development of Internet finance. The application of computer technology is conducive to the further improvement of the Internet financial system and the better promotion of transaction efficiency. However, there are also many risks in this process. In the field of financial investment, venture capital plays a very important role in the overoffering of listed companies. In this regard, we should not only improve and upgrade the computing technology, but also control the risks existing in the Internet finance. Therefore, this paper mainly discusses the application of computer technology in Internet finance, and from the perspective of the impact of venture capital in financial investment on capital overoffering of listed companies for in-depth discussion.
Research on the “Three Movements, Two Steps, Three Dimensions” online and offline hybrid teaching model--The Principles of Management as an example
Authors: Han Yijia , Luo Lin
Published: April 2021

In the current social context, information technology and education teaching are deeply integrated, classroom teaching is gradually changing from “teacher-centred” to “student-centred”, and the traditional teaching mode is gradually changing to the online and offline hybrid teaching mode. In this paper, we analyse the limitations of traditional teaching methods and propose a hybrid online and offline teaching model based on the Principles of Management. This model combines online and offline teaching, changes the roles of teachers and students, promotes teaching with learning, and enhances interaction in the teaching process, creates an immersive classroom atmosphere, enhances students’ sense of access, realises the leap from Bloom’s first-order understanding to higher-order understanding through human-computer interaction, teacher-student interaction and student-student interaction, and cultivates students’ structured thinking, critical thinking and innovative thinking.
Analyst Optimistic Forecasting and Impression Management of CSR Disclosure - Empirical evidence from China
Authors: Fengzhuo Kang , Haoran Chen
Published: April 2021

Taking the data of Shanghai and Shenzhen A-share listed companies from 2010 to 2019 as samples, this paper finds that there is A “pressure-promoting” effect of analysts’ optimistic predictions on impression management of CSR information disclosure. Further research shows that, compared with the enterprises with better performance, the “pressure promotion” effect of analysts’ optimistic prediction is more significant for enterprises with poor performance. Compared with enterprises without third-party assurance, the third-party assurance enterprises are less affected by the “pressure promotion” effect predicted by analysts. Compared with mandatory disclosure of CSR reporting companies, companies that voluntarily disclose CSR reports are less affected by the “pressure promotion” effect predicted by analysts optimistic. After a series of robustness tests, the above conclusions are still valid.
Health literacy bei onkologischen Rehabilitanden und deren Relevanz für den subjektiven Rehabilitationsverlauf
Authors: Meng Karin , Heß Verena , Schulte Thomas , Faller Hermann , Schuler Michael
Published: April 2021

Ziel der Studie „Health literacy“ (HL) umfasst das Wissen, die Motivation und die Fähigkeiten von Menschen, gesundheitsrelevante Informationen zu finden, zu verstehen, zu beurteilen, anzuwenden und Entscheidungen bezüglich Gesundheitsfragen treffen zu können. Geringe HL ist mit gesundheitsbezogenen Verhaltensweisen und Gesundheit negativ assoziiert. Die explorative Studie untersucht die HL von onkologischen Rehabilitanden und deren Zusammenhang mit Reha-Zielparametern.

Methodik Es erfolgte eine Sekundärdatenanalyse einer längsschnittlichen Fragebogenstudie mit 449 Rehabilitanden mit Brustkrebs, Prostatakrebs oder Darmkrebs in der stationären onkologischen Rehabilitation. Die Daten wurden zu 3 Messzeitpunkten (Reha-Ende, Follow-up nach 3 und 9 Monaten) erhoben. HL wurde mit einer Kurzform des European Health Literacy Survey Questionnaire (HLS-EU-Q6) erfasst. Als Reha-Zielparameter wurden Progredienzangst (PA-F-KF), psychosozialer Unterstützungsbedarf, körperliche Funktionsfähigkeit und globale Lebensqualität (EORTC QLQ-C30) sowie Arbeitsfähigkeit (WAI-Einzelitem) festgelegt. Die Zusammenhangsanalyse erfolgte mittels Regressionsanalysen kontrolliert für weitere Einflussparameter.

Ergebnisse Zum Rehabilitationsende werden HL-Anforderungen von bis zu 56% der Rehabilitanden als schwierig bewertet. Es bestehen signifikante Zusammenhänge mit den Reha-Zielparametern. Eine höhere HL ist mit geringerer Progredienzangst (β=− 0,33), geringerem psychosozialem Unterstützungsbedarf (OR=0,28), höherer körperlicher Funktionsfähigkeit (β=0,22) und höherer globaler Lebensqualität (β=0,23) sowie besserer subjektiver Arbeitsfähigkeit (β=0,21) assoziiert. Im Längsschnitt liegen meist signifikante Zusammenhänge (0,18≤ β≤0,24) zwischen der Verbesserung der HL und der Verbesserung in allen Reha-Zielparametern vor.

Schlussfolgerung Die Studie verweist auf die Relevanz von HL in der onkologischen Rehabilitation. Viele Patienten haben zum Rehabilitationsende Schwierigkeiten im Umgang mit Gesundheitsinformationen. HL ist auch ein Prädiktor für psychosoziale und physische Outcomes bis zu 9 Monaten nach der Rehabilitation. Strategien zur Förderung der Kompetenz im Umgang mit Gesundheitsinformationen könnten daher ergänzend zu Wissens- und Selbstmanagementkompetenzen in der Rehabilitation berücksichtigt werden.
De-novo-thrombotische Mikroangiopathie (TMA) nach inkompatibler AB0-Nierentransplantation
Authors: Kolb Thilo , Rump Lars Christian
Published: April 2021

Anamnese Wir berichten über einen 57-jährigen Patienten, der in unserer Klinik zur geplanten AB0-inkompatiblen Lebendnierentransplantation aufgenommen wurde.

Untersuchungen und Diagnose An Tag 3 post operationem bildeten sich laborchemisch eindeutige Hinweise für eine De-novo-TMA aus. Die renale Entgiftung stagnierte bei initialem regelrechtem Verlauf.

Therapie und Verlauf Durch den Einsatz von Eculizumab 900 mg an d3 und d10 post operationem konnten wir die TMA mit einem anhaltenden Erfolg unterbinden.

Folgerung Zu diskutieren ist, ob ein frühzeitiger Einsatz von Eculizumab bei V. a. De-novo-TMA ein sicherer Weg ist, eine Transplantatdysfunktion zu unterbinden und somit die in der Literatur beschriebene schlechte Prognose für Transplantat und Empfänger zu verbessern.
Life and Limb: Current Concepts in Endovascular Treatment of Extremity Trauma
Authors: Weaver John J. , Chick Jeffrey F.B. , Monroe Eric J. , Johnson Guy E.
Published: April 2021

Traumatic injury is the leading cause of death worldwide in younger patient populations and extremity trauma with associated vascular injury accounts for many trauma-related deaths. Iatrogenic injury is also a common cause of extremity vascular trauma and the incidence of iatrogenic injury will likely increase as endovascular techniques continue to become more ubiquitous. For many vascular injuries involving the extremities, surgical repair is viewed as the standard of care. Historically, endovascular techniques did not play a role in the treatment of these vascular injuries, rather they were utilized only as part of the diagnostic assessment; however, there is an increasing trend toward endovascular management of extremity vascular trauma. No validated, widely implemented algorithm to select patients for endovascular intervention exists. Transcatheter techniques, however, play an important role in the management of these patients. For arterial injuries, embolization can be used to rapidly achieve hemostasis if the vessel can be sacrificed. More advanced endovascular techniques such as stent-graft placement may be best employed in the context of isolated, proximal extremity injuries, although there is increasing literature supporting the use of advanced techniques for more distal arterial injuries. The management of peripheral venous trauma remains controversial; however, there is growing data describing successful endovascular management of some peripheral venous injuries. The purpose of this article is to review extremity vascular trauma, concepts of injury triage, endovascular techniques, and intraprocedural considerations.
Delayed and Chronic Sequelae of Trauma and the Role of the Interventional Radiologist
Authors: Wolf Robert , Smolinski-Zhao Sara
Published: April 2021

In addition to acute injury requiring interventional radiologic treatments, patients with traumatic injuries can develop delayed or chronic complications. These injuries can involve nearly all solid organs in the abdomen. Coupled with significant improvements in visualizing these injuries with advanced imaging techniques such as minimally invasive procedures, nonoperative management of both acute traumatic injuries and their longer term sequelae has become the norm. This article reviews frequently seen complications of traumatic injury and their management by interventional radiologists.
Reconstructive Options for Auricular Trauma
Authors: Wong Kevin , Wong Anni , Rousso Joseph J.
Published: April 2021

Given its prominent lateral position, the auricle is a common site of injury after blunt trauma. Auricular injuries can lead to both functional and aesthetic complications. A careful history and examination will help determine the mechanism of injury and identify factors that may influence repair. Auricular reconstruction is highly individualized and depends on the size, location, and nature of injury. Understanding the complex three-dimensional anatomy of the external ear is a necessity for appropriate reconstruction. This article reviews the reconstructive options for simple and complex auricular injuries based on the anatomical site and the intricate three-dimensional structures that form the auricle.
More than just a mental stressor: psychological value of social distancing in COVID-19 mitigation through increased risk perception—a preliminary study in China
Authors: Gong Yuanchao , Zhang Linxiu , Sun Yan
Published: April 2021

Social distancing is an effective measure to prevent epidemic infections during a pandemic outbreak, but its psychological value in COVID-19 pandemic mitigation remained less detected. Our study fills this gap by conducting a nationwide survey in China between 12 and 25 February (2020), and a follow-up survey targeting the same participants between 25 and 28 March (2020). We have discovered that perceived increased time staying at home, a subjective agency for social distancing, positively predicts not only risk perception of COVID-19 epidemic at the outbreak and eased stage, but also predicts subjective controllability of COVID-19 epidemic at the eased stage. Given that risk perception indicates potential active engagement of preventative behavior and that subjective controllability associating with self-efficacy could promote individual health behavior, this study preliminarily justifies the value of social distancing from the angle of perceptual factors, adding to existing mounting evidence of its effect on physically controlling pandemic spread.
Using a biomathematical model to assess fatigue risk and scheduling characteristics in Canadian wildland firefighters
Authors: Jeklin Andrew T. , Davies Hugh W. , Bredin Shannon S. D. , Perrotta Andrew S. , Hives Benjamin A. , Meanwell Leah , Warburton Darren E. R.
Published: April 2021

This study examined the shift parameters that contribute to sleep loss and on-duty fatigue in British Columbia Wildfire Service (BCWS) firefighters using sleep–wake data, work–rest data and alertness and fatigue predictions from a biomathematical model (BMM) of fatigue. A total of 40 firefighters (age: 30.4 ± 11.6 years; 13 F, 26 M) volunteered over a 14-day consecutive fireline deployment, followed by a 3-day rest period, at two separate fires in British Columbia (during the 2015 fire season). Sleep–wake data were obtained using a wrist-worn accelerometer and self-reported sleep logs. Shift start and end times were provided by the BCWS at the completion of the study. Sleep and shift data were manually entered into a validated BMM (Circadian Alertness Simulator) to generate fatigue scores and shift work patterns. Shift duration was the major contributor to fatigue, as 46% (n = 274) of shifts were ≥14 h in length and the average shift length was 13.0 ± 0.62 h. However, none of the firefighters had a high-risk fatigue score (>60). The findings from this study indicated that using a BMM of fatigue can provide important insights into shift-work parameters that contribute to workplace fatigue and sleep loss in wildland firefighters.
Collagen IV differentially regulates planarian stem cell potency and lineage progression
Authors: Chan Andy , Ma Sophia , Pearson Bret J. , Chan Danny
Published: April 2021

Significance

Comprehensive assessment of matrisome genes identified collagen IV as one of the many extracellular matrix (ECM) proteins regulating the stem cell pool in planarian tissue homeostasis and regeneration. While collagen IV has been shown to be involved in stem cell biology, our finding links it to pluripotent stem cells in vivo, including self-renewal and differentiation into tissue-specific progenitors. We show a link between the ECM niches in the parenchyma/gut region and EGF/neuregulin-secreting neurons, thus providing mechanistic insight into interactions between cell niches. The conservation of basement membranes between planarian and mammalian gut niches suggests a similar interplay may exist in the mammalian systems, worthy of further investigation.
Coexistence of three liquid phases in individual atmospheric aerosol particles
Authors: Huang Yuanzhou , Mahrt Fabian , Xu Shaun , Shiraiwa Manabu , Zuend Andreas , Bertram Allan K.
Published: April 2021

Significance

Aerosol particles are ubiquitous in the atmosphere and play an important role in air quality and the climate system. These particles can contain mixtures of primary organic aerosol, secondary organic aerosol, and secondary inorganic aerosol. We show that such internally mixed particles can contain three liquid phases. We also demonstrate that the presence of three liquid phases impacts the time needed for the particles to reach equilibrium with the surrounding gas phase and likely impacts the ability of the particles to activate into cloud droplets. A framework is presented for predicting conditions needed for the formation of three liquid phases in the atmosphere. These results will lead to improved representations of aerosols in models for air quality and climate predictions.
Livistona chinensis (Chinese fan palm).
Authors: Rojas-Sandoval Julissa
Published: April 2021

A datasheet on Livistona chinensis covering, as an economically important tree, its taxonomy, importance, silviculture, distribution, biology and ecology, uses, products and pests.
Successful Implementation of Managed Alcohol Programs in the San Francisco Bay Area during the COVID-19 Crisis
Authors: Ristau Jessica , Mehtani Nicky , Gomez Seth , Nance Michelle , Keller Devora , Surlyn Colleen , Eveland Joanna , Smith-Bernardin Shannon
Published: April 2021

Background

The COVID-19 crisis presents new challenges and opportunities in managing alcohol use disorders, particularly for people unable to shelter in place due to homelessness or other reasons. Requiring abstinence for shelter engagement is impractical for many with severe alcohol use disorders and poses a modifiable barrier to self-isolation orders. Managed alcohol programs (MAPs) have successfully increased housing adherence for those with physical alcohol dependence in Canada, but to our knowledge, they have not been implemented in the United States. To avoid life-threatening alcohol withdrawal syndromes and to support adherence to COVID-19 self-isolation and quarantine orders, MAPs were piloted by the public health departments of San Francisco and Alameda counties.

Development of MAPs

We describe implementation of a first-in-the-nation alcohol use disorder intervention of a MAP that emerged at three public health isolation settings within San Francisco and Alameda counties in California. All three interventions utilized a similar process to develop the protocol and implement the MAP that included identification of champions for system-level advocacy and engagement of stakeholders.

Implementation of MAPs

We describe the creation and implementation of the distinct protocols. We provide examples of iterative changes to workflow processes and key lessons learned pertaining to protocol development, acceptability by stakeholders, alcohol procurement, documentation, and assessment. We discuss safety considerations, noting that there were no deaths or serious adverse events in any of the patients of the MAP during the 2-month implementation period.

Conclusions

MAP pilots have been implemented in the US to aid adherence to isolation and quarantine setting guidelines. Lessons learned provide a foundation for their expansion as a recognized public health intervention for individuals with severe alcohol use disorders who are unable to stabilize within existing care systems. Based on the success of MAP implementation, efforts are under way to investigate alcohol management in homeless populations more broadly.
Real-time data acquisition using Arduino and phyphox: measuring the electrical power of solar panels in contexts of exposure to light in physics classroom
Authors: Pusch Alexander , Ubben Malte S , Laumann Daniel , Heinicke Susanne , Heusler Stefan
Published: April 2021

An easy circuit for measuring the power of a solar panel in physics classroom by using the microcontroller Arduino will be introduced in this article. The measured data is transferred via Bluetooth to the smartphone app ‘phyphox’ where it is displayed graphically. The circuitry enables measuring the power of a solar panel in different situations of light intensity. Several model experiments for students will be described.
Non-perturbative quantum Galileon in the exact renormalization group
Authors: Steinwachs Christian F.
Published: April 2021

We investigate the non-perturbative renormalization group
flow of the scalar Galileon model in flat space. We discuss
different expansion schemes of the Galileon truncation, including a
heat-kernel based derivative expansion, a vertex expansion in
momentum space and a curvature expansion in terms of a covariant
geometric formulation. We find that the Galileon symmetry prevents a
quantum induced renormalization group running of the Galileon
couplings. Consequently, the Galileon truncation only features a
trivial Gaussian fixed point.
Hawking radiation and page curves of the black holes in thermal environment
Authors: Li Ran , Wang Jin
Published: April 2021

As realistic objects in the Universe, the black holes are surrounded by complex environment. By taking the effect of thermal environment into account, we investigate the evaporation process and the time evolutions (page curves) of the entanglement entropies of Hawking radiation of various types of black holes. It is found that the black holes with the thermal environments evaporate slower than those without the environments due to the environmental contribution of the energy flux in addition to Hawking radiation. For Schwarzschild black hole and Reissner-Nordström black hole in flat spaces, when the initial temperature of the black hole is higher than the environment temperature, the black holes evaporate completely and the Hawking radiation is eventually purified. For Schwarzschild-AdS black hole, it will evaporate completely and the Hawking radiation is purified when the environment temperature is lower than the critical temperature. Otherwise, it will reach an equilibrium state with the environment and the radiation is maximally entangled with the black hole. Our results indicate that the final state of the black hole is determined by the environmental temperature and the temporal evolution and the speed of the information purification process characterized by the page curve of the Hawking radiation is also influenced by the thermal environment significantly.
The upper bound on the tensor-to-scalar ratio consistent with quantum gravity
Authors: Wu Lina , Gao Qing , Gong Yungui , Jia Yiding , Li Tianjun
Published: April 2021

We consider the polynomial inflation with the tensor-to-scalar ratio as large as possible which can be consistent with the quantum gravity (QG) corrections and effective field theory (EFT). To get a minimal field excursion Δϕ for enough e-folding number N, the inflaton field traverses an extremely flat part of the scalar potential, which results in the Lyth bound to be violated. We get a CMB signal consistent with Planck data by numerically computing the equation of motion for inflaton ϕ and using Mukhanov–Sasaki formalism for primordial spectrum. Inflation ends at Hubble slow-roll parameter

ϵ

1

H

=
1

or

a

̈

=
0

. Interestingly, we find an excellent practical bound on the inflaton excursion in the format

a
+
b

r

, where a is a tiny real number and b is at the order 1. To be consistent with QG/EFT and suppress the high-dimensional operators, we show that the concrete condition on inflaton excursion is

Δ
ϕ

M

Pl

<
0.2
×

10

≃
0.632

. For n

s
= 0.9649, N

e
= 55, and

Δ
ϕ

M

Pl

<
0.632

, we predict that the tensor-to-scalar ratio is smaller than 0.0012 for such polynomial inflation to be consistent with QG/EFT.
Restricted Boltzmann machine: Recent advances and mean-field theory*
Authors: Decelle Aurélien , Furtlehner Cyril
Published: April 2021

This review deals with restricted Boltzmann machine (RBM) under the light of statistical physics. The RBM is a classical family of machine learning (ML) models which played a central role in the development of deep learning. Viewing it as a spin glass model and exhibiting various links with other models of statistical physics, we gather recent results dealing with mean-field theory in this context. First the functioning of the RBM can be analyzed via the phase diagrams obtained for various statistical ensembles of RBM, leading in particular to identify a compositional phase where a small number of features or modes are combined to form complex patterns. Then we discuss recent works either able to devise mean-field based learning algorithms; either able to reproduce generic aspects of the learning process from some ensemble dynamics equations or/and from linear stability arguments.
Low Cost Data Acquisition System for Road-Vehicle Interaction Using Arduino Board
Authors: Pal Singh Harinder , Singh Ramandeep
Published: April 2021

Roads are used to travel and transfer of goods from one place to another using vehicles like passenger cars or goods carriers. Roads may get damaged due to overloading, weather conditions or end of life. Vehicles moving on the road can be used to access the road condition along with other parameters like driving behavior, presence of traffic, vehicle accident detection, vehicle suspension health monitoring etc. To monitor this, vehicle and road interaction could be acquired by fitting accelerometers on the vehicle. 3-axis accelerometers can provide acceleration data for the vertical, longitudinal and lateral axis of the vehicle. GPS coordinates could be recorded using a GPS receiver along with vehicle speed. Data from accelerometers could be used to detect road anomalies like speed bumps and potholes, braking and acceleration events and turning of the vehicle. GPS receiver can be used to collect longitude and latitude coordinates to mark the location of the event along with speed of the vehicle. In this paper we are proposing an Arduino microcontroller board based low cost data acquisition system for road and vehicle interaction that could be used for various purposes like road anomaly detection, driver behavior detection, road traffic detection and detection of vehicle collision.
Numerical solution of fractional Volterra integral equation with piecewise continuous kernel
Authors: Sidorov D , Muftahov I , Tynda A
Published: April 2021

Integral equations play the important role in applied mathematics, related to many areas of theory, especially applications. In this article, we consider the numerical method for solving Volterra integral equations for the fractional order of integration. The error of this method is O(1/N).
Application of the regularization method to some singularly perturbed hyperbolic partial differential equations
Authors: Zakharova I V
Published: April 2021

This paper considers the Cauchy problem for a hyperbolic partial differential equation containing a small parameter in the main part. When the small parameter is zero, the order of the equation does not decrease, but the original problem changes its type and becomes a Cauchy problem for a parabolic equation. The inability of a solution to the limit problem to satisfy all the conditions of the original problem leads to creation of a boundary layer region in the neighborhood of the initial conditions. The structure of an asymptotic solution to a singularly perturbed problem in the form of a regularized series makes it possible to write the solution as a single whole, without separately constructing boundary functions. In this case, the boundary effects are described by additional independent variables introduced by the spectrum of the limit operator. The principal feature of the problem considered in this paper, namely, absence of the spectrum of the limit operator, does not allow us to fully apply the method of constructing an asymptotic solution by the regularization method of S. A. Lomov. In this paper, we propose a method for solving such problems using the direct Fourier transform. An algorithm for formulating the coefficients of a regularized series is given, and zero and first terms of the asymptotic are formulated.
On the solvability of a semilinear hyperbolic equation with a parameter
Authors: Kerimbekov A , Baetov A , Krasnichenko L
Published: April 2021

A semilinear hyperbolic equation with a parameter is considered. Sufficient conditions for unambiguous solvability of the boundary value problem are proved. A range of parameter values is specified for which a boundary value problem has a unique solution.
Mathematical modelling of biology processes based on the table of prime links in the solid torus up to 4 crossings
Authors: Akimova A A
Published: April 2021

The motivation to study links in lens spaces can be justified in recent applications to theoretical physics and biology. In this paper, we give a short outline of practical significance and implementation proposals of such links, the study of which begins with the study of links in the solid torus, since a punctured disk diagram of a link in the lens space can be considered as a punctured disk diagram in the solid torus provided with the additional slide move. However, links in the solid torus find their applications themselves as well. In this paper, we propose a method to represent knotted proteins as links in the solid torus. Such a method is based on the existence of correspondence between knotoids and knots in the solid torus using a double branched cover. To this end, the table of links in solid torus is necessary. Therefore, we classify all prime links in the solid torus up to 4 crossings. One of possible future applications of the constructed table is an analysis of the database LinkProt that collects information about protein chains and complexes that form links. Also, our table can be used to construct table of prime links in lens spaces.
Genetic algorithm for minimization of ESOP representations for multiple-output logic functions
Authors: Kazimirov A , Maleyev V
Published: April 2021

This article concerns ESOP representations for multiple-output logic functions. Exclusive-or sum-of-products expression (ESOP) is a formula representing a logic function as an exclusive-or sum of products of variables and their negations. EXOR-based realization leads to reduction in size of logic circuits for many practical logic functions and improves their testability. Minimization of a logic function is a problem of constructing ESOP representation for the given function having the minimal number of summands. We introduce a correspondence between ESOPs for multiple-output logic functions and single-output logic functions and propose genetic algorithm obtaining close to minimal ESOP representations for multiple-output logic functions.
Linear singlet equation in the surface phenomena physics
Authors: Agrafonov Yu , Petrushin I
Published: April 2021

We consider difficulties and algorithms of numerical solution of nonlinear equations of statistical physics of liquids. Analysis of nonlinear singlet equations of the surface phenomena in liquids is carried out. To solve Fredholm integral equations of second kind we compare the known algorithms and evaluate their application for linear singlet equation.
Program complex for solving of some classes of aerohydroelasticity problems
Authors: Ankilov A V , Velmisov P A
Published: April 2021

On the basis of the developed mathematical models, a program complex was created for studying the dynamics and stability of an elastic pipeline, an elastic structural element in supersonic flow, elastic elements of wing profiles of several types with subsonic flow, elastic elements of vibration devices of several types. The complex generates three-dimensional graphs of element deformations, construction of animation graphs of element deformations, construction of flat graphs of deformations and strain rate at a given point or at a given time. On the basis of the constructed graphs, one can study the dynamics and draw conclusions about the stability of vibrations of elastic structural elements.
Limit transitions in plane homogenization problems for two-phase dielectric composites with extreme material properties of one phase
Authors: Kudimova A B , Nasedkin A V
Published: April 2021

The plane problem of calculating the effective dielectric constant of two-phase composite consisting of main material with one circular inclusion is considered. To solve the homogenization problem, the method of effective moduli with the support of the energy balance between the composite and the homogeneous comparison medium was used. In the solution obtained, the passage to the limit was made for the case of an inclusion with zero dielectric constant and for the case of a conductive inclusion. The limiting solutions are compared with the solutions of homogenization problems for a medium with a hollow and for a medium with a conducting inclusion boundary.
Micromagnetic modeling of the polycrystalline structure effect to the hysteresis loop in ferromagnetic nanowire
Authors: Satsuk S A , Komogortsev S V
Published: April 2021

Extensive micromagnetic simulation results of the hysteresis loops in ferromagnetic nanowire with randomly oriented crystallites ordered in one chain is presented. Three main contributions to the magnetic energy of the wire had been taken into account: exchange, dipole-dipole, and the magnetic anisotropy energy of the crystallite. In cases where one of the three contributions to the energy can be neglected, the numerical calculations are in good agreement with the results of the well-known, analytically studied micromagnetic problems. In the case when all three contributions are comparable, a complex non-monotonic dependence of the coercive force on the crystallite size and the magnetic anisotropy constant is observed. In order to interpret these changes, a new micromagnetic scale is introduced, which takes into account all three contributions to the magnetic energy of the wire, and performs a correct transition to the analytically studied limits, which take into account the competition of any two contributions.
A complex absorbing potential electron propagator approach to resonance states of metastable anions
Authors: Belogolova A M , Dempwolff A L , Dreuw A , Trofimov A B
Published: April 2021

An earlier developed electron propagator method for the treatment of electron attachment to molecules within the non-Dyson algebraic-diagrammatic construction framework (EA-ADC) is extended by inclusion of the complex absorbing potential (CAP). The resulting method allows for the investigation of resonance states of metastable anions. Approximation schemes up to third-order perturbation theory for the electron propagator (EA-ADC(3)) are implemented. The CAP operator is treated up to second-order using the intermediate state representation formalism (ISR(2)) and the subspace projection technique. The CAP/EA-ADC(3) method is tested in first applications to the resonances in CO and N2 molecules associated with electron attachment to their low-lying π*-orbitals. The results of the calculations agree well with the available experimental and theoretical data and demonstrate the CAP-augmented EA-ADC modeling can become a useful tool for theoretical studies of metastable electron-attached states.
Vibronic coupling in the Pyridine Radical Cation: Nuclear Dynamics Studied Using the Multi-configuration Time-Dependent Hartree method
Authors: Grigoricheva E K , Skitnevskaya A D , Gromov E V , Trofimov A B
Published: April 2021

The multi-configuration time-dependent Hartree (MCTDH) method was applied to study nuclear dynamics following transitions to a manifold of vibronically coupled ground 2A1 and excited 2A2 and 2B1 states of the pyridine radical cation (PRC). These states originate from ionization out of the highest occupied orbitals of pyridine, 7a1 (nσ), 1a2 (π), and 2b1 (π), respectively, and give rise to the lowest two photoelectron bands. We focus on various theoretical and computational aspects of the MCTDH method and methodology to calculate the spectrum, taking our study of the vibronically interacting 2A1, 2A2, and 2B1 states of PRC as an example. In particular, the choice of the single-particle functions (SPFs) and schemes to combine vibrational modes are discussed.
Inhibitory effect of tannin extract from Acacia bark (Acacia mangium Willd.) against gastro-intestinal pathogenic bacteria
Authors: Sinaga D M , Laconi E B , Jayanegara A
Published: April 2021

Acacia (Acacia mangium Willd) is a fast growing tree species that widely found in Indonesia. Acacia bark contains a number of secondary metabolites such as tannin, saponin and flavonoid that may inhibit the growth of undesirable microbes incuding the pathogenic ones. The purpose of this research was to evaluate the antimicrobial activity of tannin extract obtained from Acacia bark against common pathogenic bacteria species present in the gastro-intestinal tract of livestock, i.e., Salmonella typhimurium and Eschericia coli as Gram negative bacteria. The disc diffusion method was employed for assessing the antimicrobial activity of Acacia tannin extract. Treatments consisted of negative control (NC), positive control by using chloramphenicol (PC), Acacia tannin extract at two concentrations, i.e., 1% (AT1) and 2% w/v (AT2), and commercial chestnut tannin at 1% (CT1) and 2% w/v (CT2). Data were analyzed by using analysis of variance and followed by a post-hoc test namely Duncan’s multiple range test. Results showed that the inhibitory diameters formed on the activity assay of AT in the form powder, liquid and CT with concentration of 2% against Salmonella typhimurium bacteria were 17.3, 7 and 16 mm, respectively. Inhibitory diameters of AT powder, AT liquid and CT against Eschericia coli bacteria were 17.3, 0 and 17 mm, respectively. The AT powder resulted in a higher inhibition of both pathogenic bacteria species than that of liquid form (P<0.05), whereas its inhibitory effect was similar to commercial CT. In conclusion, 2% AT can be used to inhibit the growth of Salmonella typhimurium and Eschericia coli bacteria in which its magnitude of inhibition is comparable with commercial tannin extract from chestnut.
Technology development in thermochemistry materials
Authors: Wibawa B , Syakdiyah H , Kardipah S
Published: April 2021

Thermochemistry is an important basic concept in studying advanced chemistry. Thermochemistry is very important to understand correctly and easily. This research aims to develop technology that can facilitate understanding of thermochemistry. This research is a research and development research (R & D). In this research, a technological development can be produced which can be used to facilitate understanding of thermochemical concepts. This research resulted in a framework of thermochemical material integrated with science (biology, physics), mathematics, engineering, ICT technology.
Purification of Fim-C-Salmonella typhi recombinant protein with Ni-NTA resin as raw material for typhoid disease detection kit
Authors: Nurjayadi M , Setiyoto T , Jinan S F , Hardianto D , Sulfianti A , Agustini K , El-Enshasy H A
Published: April 2021

Typhoid fever caused by Salmonella typhi is an endemic disease in Asia, including Indonesia. Based on data from the World Health Organization (WHO), there are 81% per 100,000 people in Indonesia infected with typhoid. Based on this, development of typhoid detection kit that is simple, fast, specific and sensitive is still needed. One of the developments of detection kits currently available is the antigen and antibody interaction approach. This study aims to obtain comprehensive information about purification of recombinant Fim-C-S. typhi proteins as antigens for raw materials for manufacturing typhoid detection kits. This study uses the IMAC method with Ni2+ metal, which has advantages in high selectivity and purity. The results of this study report that purification of recombinant Fim-C-S. typhi protein inclusion bodies with variations in the binding and washing process at 3, 5, and 7 times gave percent yields correspondingly of 37.84, 39.44, and 38.21% pure protein. Previous studies have also reported variations in binding and washing at 2, 4, and 6 times and gave percent yields respectively were 35.37, 39.11, and 40.49%. Based on the data, we concluded that the variation of 6 times is the best repetition variation to get the largest percent yield so that it can be used as a reference in large-scale purification.
Antioxidant activity of Litsea petiolata Hk. f
Authors: Ambarwati N S S , Elya B , Mahayasih P G M W , Awang M S N , Omar H
Published: April 2021

Litsea petiolata Hk. f was included Lauraceae family, and the previous study had been isolated 5 compounds from the Litsea petiolata Hk. f stem bark dichloromethane extract namely harman or aribine, norharman, reticuline, isoboldine, and thalifoline. Antioxidants can prevent tissue damage by free radical. Free radical production continuously in all cells as cellular function usually, but excess production can cause many diseases. The research aimed to assay the activity of antioxidant from the extract and fractions of the Litsea petiolata Hk. f stem bark with DPPH assay and FRAP assay. The extract was obtained by soxhletation used dichloromethane as solvent. The fractions fractionated with column chromatography. The antioxidant test used DPPH assay and FRAP assay. The IC50 values for the 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging test of the dichloromethane extract was 27.36 µg/mL, the fraction A was 113.74 µg/mL, fraction B was 60.17 µg/mL, and the control positive (quercetin) was 3.96 µg/ml. The EC50 values for ferric ion reducing antioxidant potential (FRAP) test of the dichloromethane extract was obtained 13.47 µg/mL, the fraction A was 76.49 µg/mL, fraction B was 55.73 µg/mL, and the control positive (quercetin) was 14.01 µg/ml. The extract had higher antioxidant activity than the fractions, and by FRAP test the extract showed better antioxidant activity than the positive control (quercetin).
MDLC model for developing multimedia e-learning on energy concept for primary school students
Authors: Kumala F N , Ghufron A , Astuti P P , Crismonika M , Hudha M N , Nita C I R
Published: April 2021

This study aims at developing multimedia instructional material at the elementary school level by using the MDLC (Multimedia Development Life Cycle) model. This research developed multimedia platform which consisted of learning modules and videos. MDLC constitutes methods consisting of concept, design, collection of materials, assembly, testing, and distribution. In developing multimedia by using MDLC, it was based on a flowchart system and a learning video story board. The results indicated that the multimedia developed was in accordance with the MDLC steps. Based on the results of alpha and beta tests, it indicated that the e-learning multimedia developed is feasible and practical to be used by elementary school students. Multimedia that was developed employs a variety of learning sources that are able to enrich student’s knowledge in a more interactive presentation.
A review of data mining methods in RFM-based customer segmentation
Authors: Ernawati E , Baharin S S K , Kasmin F
Published: April 2021

Data mining (DM) is the process of extracting knowledge from data. Knowledge from customer behaviour segmentation is useful for companies in setting the target market and developing a marketing strategy. Recency Frequency Monetary (RFM) model is the most behaviour segmentation used. Many customer-segmentation studies in various application areas use the RFM model that collaborates with DM. With many methods in DM, the selection of appropriate methods can reveal useful hidden patterns in customer segments. This paper aims to analyse DM methods that collaborate with the RFM model and synthesize them to propose a customer segmentation framework. This study uses a comprehensive literature review published in 2015-2020. The most widely used methods are clustering and visualization from seven DM methods analysed. Due to the increased visualization function and the need for customers’ geo-demographic data to be considered in the analysis, this study presents a new framework for using DM methods with the RFM based segmentation in the Geographic Information Systems (GIS) environment. This framework helps analysts utilize DM methods to uncover and understand customer characteristics, so companies can set the target market and develop a marketing strategy to increase their competitive advantage.