bluuebunny/crossref_metadata_2025 huggingface dataset:
Water calorimetry-based k

Q
factors for Farmer-type ionization chambers in the SOBP of a carbon-ion beam
Authors: Holm Kim Marina , Jäkel Oliver , Krauss Achim
Published: June 2021

The dosimetry of carbon-ion beams based on calibrated ionization chambers (ICs) still shows a significantly higher uncertainty compared to high-energy photon beams, a fact influenced mainly by the uncertainty of the correction factor for the beam quality k

Q
. Due to a lack of experimental data, k

Q
factors in carbon-ion beams used today are based on theoretical calculations whose standard uncertainty is three times higher than that of photon beams. To reduce their uncertainty, in this work, k

Q
factors for two ICs were determined experimentally by means of water calorimetry for the spread-out Bragg peak of a carbon-ion beam, these factors are presented here for the first time. To this end, the absorbed dose to water in the 12C-SOBP is measured using the water calorimeter developed at Physikalisch-Technische Bundesanstalt, allowing a direct calibration of the ICs used (PTW 30013 and IBA FC65G) and thereby an experimental determination of the chamber-specific k

Q
factors. Based on a detailed characterization of the irradiation field, correction factors for several effects that influence calorimetric and ionometric measurements were determined. Their contribution to an overall uncertainty budget of the final k

Q
factors was determined, leading to a standard uncertainty for k

Q
of 0.69%, which means a reduction by a factor of three compared to the theoretically calculated values. The experimentally determined values were expressed in accordance with TRS-398 and DIN 6801-1 and compared to the values given there. A maximum deviation of 2.3% was found between the experiment and the literature.
An optimized cluster density matrix embedding theory
Authors: Geng Hao , Jie Quan-lin
Published: June 2021

We propose an optimized cluster density matrix embedding theory (CDMET). It reduces the computational cost of CDMET with simpler bath states. And the result is as accurate as the original one. As a demonstration, we study the distant correlations of the Heisenberg J
1–J
2 model on the square lattice. We find that the intermediate phase (0.43 ≲ J
2 ≲ 0.62) is divided into two parts. One part is a near-critical region (0.43 ≲ J
2 ≲ 0.50). The other part is the plaquette valence bond solid (PVB) state (0.51 ≲ J
2 ≲ 0.62). The spin correlations decay exponentially as a function of distance in the PVB.
Tunable wide-angle multi-band mid-infrared linear-to-linear polarization converter based on a graphene metasurface*
Authors: Zhang Lan-Lan , Li Ping , Song Xiao-Wei
Published: June 2021

We present a high-efficiency tunable wide-angle multi-band reflective linear-to-linear (LTL) polarization converter, which is composed of an array of two L-shaped graphene patches with different sizes. In the mid-infrared region, the proposed converter can transform x-polarized wave into y-polarized wave at four resonant frequencies. The polarization conversion ratios of the four bands reach 94.4%, 92.7%, 99.3%, and 93.1%, respectively. By carefully choosing the geometric parameter, triple-band LTL polarization conversion can also be realized. The three polarization conversion ratios reach 91.50%, 99.20%, and 97.22%, respectively. The influence of incident angle on the performances of the LTL polarization converter is investigated, and it is found that our polarization converter shows the angle insensitivity. Also, the dynamically tunable properties of the proposed polarization converter are numerically studied by changing Fermi energy. All the simulation results are conducted by finite element method.
Topology optimization method of metamaterials design for efficient enhanced transmission through arbitrary-shaped sub-wavelength aperture*
Authors: Shi Pengfei , Cao Yangyang , Zhao Hongge , Gao Renjing , Liu Shutian
Published: June 2021

The electromagnetic wave enhanced transmission (ET) through the sub-wavelength aperture was an unconventional physical phenomenon with great application potential. It was important to find a general design method which can realize efficient ET for arbitrary-shaped apertures. For achieving ET with maximum efficiency at specific frequency through arbitrary-shaped subwavelength aperture, a topology optimization method for designing metamaterials (MTM) microstructure was proposed in this study. The MTM was employed and inserted vertically in the aperture. The description function for the arbitrary shape of the aperture was established. The optimization model was founded to search the optimal MTM microstructure for maximum enhanced power transmission through the aperture at the demanded frequency. Several MTM microstructures for ET through the apertures with different shapes at the demanded frequency were designed as examples. The simulation and experimental results validate the feasibility of the method. The regularity of the optimal ET microstructures and their advantages over the existing configurations were discussed.
Influence of Coulomb force between two electrons on double ionization of He-like atoms
Authors: Liu Peipei , Li Yongfang , Zhang Jingtao
Published: June 2021

In strong-field double ionization, two electrons are ionized by intense laser field. These two electrons move in the laser field and the state is described by a Coulomb–Volkov state, where the repulsive Coulomb state describes the relative motion of the two electrons and the Volkov state describes the center-of-mass motion of the two electrons in the laser field. In the frame of scattering theory, we derive a simple analytical formula of the double ionization of He-like atoms. The effect of the Coulomb force between two electrons on the double ionization process is discussed. Numerical studies disclose that the Coulomb force enhances the ionization rate of high-energy electrons but suppresses the ionization rate of the lowest-energy electrons.
Study of Customer Satisfaction on Construction Company Performance in the Scope of Public Works Office in Ternate City
Authors: Ahadian ER , Rizal M , Albaar N
Published: June 2021

The construction business world is a world of competition, whose intensity is getting tougher from day to day. One of the factors causing low loyalty is the lack of customer satisfaction with products and services so far. This study aims to determine what factors influence satisfaction (Owner) of the performance of construction companies (Contractors) that are within the scope of the Ternate City Public Works Department. Based on the analysis of the Weigh Mean Method used to measure the performance of contractor companies in Ternate City. The results of the analysis at the level of satisfaction with the highest mean value is 3.5641, namely (K3 and K11), namely the Quality of the Bag in Accordance with Technical Specification and the Conformity of the Project Report to Actual Conditions in the Field.
Skin Cancer Classification Detection using CNN and SVM
Authors: Pushpalatha A , Dharani P , Dharini R , Gowsalya J
Published: June 2021

Skin malignant growth is quite possibly the most commonly seen Malignancy type in people. Skin disease happens because of the un controllable developing of transformations occurring in DNAs developing to certain reasons. Perceiving the malignant growth in beginning phases could build the opportunity of an effective treatment. These days, PC helped finding applications are utilized nearly at each field. From the real dermo scopic images, the first-stage network aims for precise segmentation of the skin lesion. The second-stage network is a classification network that can predict the existence of Melanoma and Squamous Cell Carcinoma in a skin sample. Deep convolutional neural networks, such as Inception-v4, ResNet-152, and DenseNet-161, were trained for melanoma and squamous cell carcinoma detection and seborrheickeratosis classification. U-Net with VGG-16 Encoder was trained to create segmentation masks for lesion segmentation. Resnet engineering achieves the highest precision of 90 percent among the equations used in the proposed models.
Development and testing of low-power EP based on the ablative pulsed plasma thruster for an ERS SSC
Authors: Bogatyi A V , Dyakonov G A , Kashirin D A , Popov G A , Semenikhin S A
Published: June 2021

The paper presents the appearance of a low-power electric propulsion system for a small remote sensing satellites based on an ablative pulsed plasma thruster. Preliminary analysis for the purpose and fields of application of ablative pulsed plasma thrusters (APPT) was carried out. The design appearance of a thruster for small remote sensing satellites was identified, and the main directions of APPT further development were defined. Methods for calculating the APPT propulsion characteristics were developed. The breadboard model of APPT for small remote sensing satellites was developed and made (APPT-350). Research tests of the breadboard model of APPT for Earth remote sensing small spacecrafts were carried out.
Mathematical modeling of safe payload separation using logos software on chimera-type grids
Authors: Sokuler M S , Arifullin R KH
Published: June 2021

One of the most important problems in the development of air weapons is the separation of air weapons from the aircraft. Carrying out this type of tests is expensive, time-consuming and dangerous, so separation and prediction of the trajectory of air weapons using numerical simulation becomes an important part of the study. In this work, a full-scale model of F-18 and a full-scale model of air weapons GBU-31 JDAM were used to test the planned trajectory of separation of air weapons from the wing. The transonic flight mode with Mach number M = 0.962 was considered. The Navier-Stokes and Euler equations were used for numerical modeling, considering the effect of the fluid viscosity effect on the flight path of air weapons during separation from the wing.
Nonlinear stability analysis of a collinear libration point in the planar circular restricted photogravitational three-body problem
Authors: Bardin B S , Avdyushkin A N
Published: June 2021

We investigate the problem on stability of collinear libration point in the photogravitational three-body problem. That is, we study the stability of stationary motion of an infinitesimal small body (particle) in gravitational field of two bodies (primaries) acting on the particle with radiation pressure repulsive forces. The primaries move in circular coplanar orbits about their barycenter and the particle lies in the plane of primaries motion. By using the method of normal forms and applying theorems of the Kolmogorov-Arnold-Moser theory we perform nonlinear stability study of collinear point, which located on the line connecting the primaries. Rigorous conclusions on stability in the sense of Lyapunov have been obtained both for non-resonant case and for cases of third and fourth order resonances. These results can be interesting for spaceflight and astronomical applications such as studies of dynamics of artificial satellites and observations of cosmic dust.
Analysis of the latent space of pre-trained deep convolutional neural networks in the problem of automatic segmentation of color images
Authors: Galkin V , Makarenko A , Targamadze D
Published: June 2021

The paper presents a primary study of the latent space structure of neural networks trained for semantic segmentation. Segmentation was performed in a controlled environment of three classes of colored rectangular shapes. The classic autoencoder and U-net like architectures were chosen as reference architectures. To study the structure of the space, a combination of a perceptron that linearly separates classes and the compression algorithms UMAP and PCA was used. As a result, a tool was obtained for evaluating the quality of a neural network based on the degree of separability of classes in the latent space of the network.
Simulation of non-stationary gas dynamics of solid propellant rockets launch
Authors: Kostyushin K V , Kagenov A M , Eremin I V , Zhiltsov K N , Chervakova A V
Published: June 2021

The article presents the results of the development of methodology for the calculation of non-stationary gas dynamics processes occurring in gas dynamic paths of rocket engines and environment at the launch of rockets. The method takes into account the change of geometry of solid fuel combustion surface during the operation of the engine and the change in the geometry of the computational domain taking into account the dynamics of rocket launch. Numerical simulation of gas-dynamic processes of the launch of model solid-fuel rocket was done. The unsteady gas-dynamic flow pattern was investigated. The pressure curve in the solid propellant rocket engine combustion chamber, the speed of movement and overload were determined.
Development of an unmanned aerial vehicle to study atmospheric boundary-layer turbulent structure
Authors: Chechin D G , Yu Artamonov A , Ye Bodunkov N , Yu Kalyagin M , Shevchenko A M , Zhivoglotov D N
Published: June 2021

One of the main challenges in the boundary-layer turbulence research consists in advancing turbulence theory towards describing turbulent regimes over inhomogeneous and irregular surface which is often the case in nature. Novel observational techniques are required to sample turbulence statistics in such conditions. To that aim, a light-weight payload for atmospheric turbulence measurements is designed and used on a vertical take-off and landing (VTOL) fixed-wing unmanned aerial vehicle (UAV). Such an observational platform complements traditional mast observations and makes it possible to sample turbulence statistics over remote and inhomogeneous landscapes. The advantages of the VTOL scheme consist in: i) minimizing the risk of the payload damage during landing; ii) less strict requirements to the surface conditions in the landing area. The turbulence payload consists of a miniature seven-hole probe, inertial navigation system and a fine-wire resistance thermometer. The seven-hole probe and the fine-wire temperature sensor were designed and calibrated as part of this study. In addition, the payload also includes a slow-response temperature-humidity sensor, relatively fast humidity sensor as well as an infrared surface temperature sensor. For the onboard data-logging, a computer based on Raspberry Pi 4 is used. The whole system has been successfully tested at the Tsimlyansk research station, Russia.
Elastic computing self-organizing for artificial intelligence space exploration
Authors: Semenov A
Published: June 2021

The aim of this article is to provide a methodology useful for designing and controlling elastic computing self-organizing for artificial intelligence space exploration. The artificial intelligence application itself should be elastic and distributed in the context of limited information technologies resources in space. The most important use of elastic computing is artificial intelligence’s ability to continually learn and adapt to evolving environments and goals. The conceptual framework uses elastic infrastructure model and the terminology of graph dynamical systems to be able to capture a broad variety of processes taking place on self-organizing networks. The methodology’s uniqueness lies in the theory of graph dynamical systems used to explain the self-organizing processes life cycle.
Massively parallel solution of the Lambert problem
Authors: Kravchenko V S , Ivanyukhin A V
Published: June 2021

This paper considers the possibility of massively parallel solution to the Lambert problem on graphics processing units. Several of the most popular solution algorithms were used for this problem. Software implementation of algorithms under consideration has been developed using Compute Unified Device Architecture technology that allows performing calculations on graphics processing units. A distinctive feature of this project is an attempt to use parallel programming within an iterative scheme. The developed algorithms have been tested on a number of typical tasks: contouring of Earth – Mars direct flight isolines and solution of the problem of a flight to a group of asteroids for the given start date and flight duration. For such tasks we give estimates of execution time and paralleling efficiency.
Self-electromagnetic emission from a thruster with anode layer operating with krypton and xenon
Authors: Shilov S , Ivakhnenko S , Vorob’ev E , Manegin D , Plokhikh A , Vazhenin N , Merkurev D , Zakharchenko V
Published: June 2021

This paper considers the study of self electromagnetic emission from the experimental model of low-power thruster with anode layer (TAL) developed by the Bauman Moscow State Technical University. The measurements were carried out during the thruster operation on krypton and xenon for three operating modes: 600 W, 800 W and 1000 W at a discharge voltage of 300 V. Parameters of the generated electromagnetic fields were measured in frequency range from 1 GHz to 12 GHz in the filter bandwidth of 1 MHz. The receiving antenna was installed at a distance of 1 m from the thruster exit plane, perpendicularly to its axis. The results of analysis and comparison of TAL emission spectral characteristics during its operation on krypton and xenon are presented.
Hybrid capacitor based on carbon matrix for intelligent electric energy storage and transportation system
Authors: Diteleva A , Sleptsov V , Savilkin S , Matsykin S , Granko A
Published: June 2021

This paper describes the developed complex of vacuum thin-film technologies for creating electrode materials of energy storage devices for an intelligent source of accumulation, storage and transportation of electricity. Thin-film technologies, in contrast to thick-film technologies, allow more efficient use of surface properties, using nanostructured materials and structures. The developed complex allows us to implement a promising technology for creating a new generation of electrode materials based on a flexible carbon matrix with a highly developed surface. On the basis of the developed electrode material, hybrid capacitors were manufactured and studied, the specific energy of which is currently ∼ 20 W·h/kg, which is a higher indicator than the currently available indicators in the literature. The article also discusses ways to increase the energy intensity to ∼ 50 W·h/kg.
Developing scientific competencies: a collaboration between High School teachers and Physics researchers to create experiment-based learning activities
Authors: Pallotta Filippo , Parola Alberto , Bondani Maria
Published: June 2021

The last EU recommendations on key competences for lifelong learning encourage educational institutions to strengthen the collaboration between Physics researchers and Secondary School teachers to implement competence-oriented education, training and learning. Our group has carried out a collaboration project with a group of high school physics teachers engaged in a PLS (Progetto Lauree Scientifiche) professional development course promoted by the Department of Science and High Technology (DiSAT – Dipartimento Scienze e Alta Tecnologia) of Insubria University in Como, Italy. The aim of the course was to enable teachers to create balanced and effective learning activities to be used in class to reinforce the scientific competencies and skills required in the Final Exam of the Italian Secondary School (Esame di Stato) and in the entire physics curriculum. This paper presents the result of this collaboration to understand how to better support the collaboration between Physics researchers and High School teachers in order to design teaching and learning materials that can be effectively integrated in the daily classroom activities, focusing the attention on problem solving and data interpretation skills, as requested by the last education reform for Italian Secondary School Final Exam.
Colours: Human Vision and Surroundings
Authors: Montalbano Vera , Marchini Daniela
Published: June 2021

We propose interdisciplinary teaching-learning sequences focusing on colours. How do we perceive colours? How do animals perceive it? How do some animals make unusual coloured liveries? The proposal was initially tested with high school students in a summer school, then it was discussed in a summer school for science teachers in order to enhance the interdisciplinary aspects. Finally, it was proposed and discussed in a training event for in-service science teachers. Involvement and motivation in the learning process were the main reactions expected and the forecasts were fully achieved.
The subject of waves in a new approach introductory steps of a Design Based Research (DBR)
Authors: Finta Zs , Jenei P , Schramek A
Published: June 2021

Based on years of teaching, our team aims to elaborate a modern experimental manual with a modular structure meant to entwine the features of a traditional book on paper support with the advantages of an e-book. The chapter on the Wave Theory has been written as a start-up. In our vision, the core material of the manual is targeting those high-school students who do not wish to study Physics on a higher level, meanwhile the extensions to the lessons (such as the simulations, high-level extra information and any other attractive topics etc.) are for the students who are interested in Physics and who are thus given the possibility of a more profound study. The traditional manual would be designed to cover the core material, and the extensions would be made accessible via smartphones, as well as the QR-codes placed in the lessons. The webpage that has been added to the online version includes the written lessons, the extensions being placed into so-called boxes. Approach to the chapter largely differs from any previous approaches as the wave types are presented along with the description of the related wave phenomena. Practicality and efficiency testing of the webpage is ongoing in a rather close circle via questionnaires and a multiple choice test, the manual to be continuously improved and amended subsequent to the feedback we receive and according to our own teaching experiences..
Development of inquiry skills at lower secondary school level
Authors: Kireš Marián , Jurková Veronika
Published: June 2021

As part of a national IT Academy project, our goal is to increase pupils’ interest in studying Informatics and STEM subjects in general. We consider the changes in education focused on targeted use of the IBSE approach to be key. We monitor the development of pupils’ skills and the degree of conceptual understanding of key concepts and phenomena. To introduce the necessary innovations in every STEM subject, a team of experts has proposed 60 innovative lessons (methodologies), for each subject. The methodologies were piloted and evaluated by experienced teachers, modified and re-entered in the verification. Teachers have the opportunity to participate in continuous education, where they gain experience with inquiry teaching approach, formative assessment and strategies for developing pupils’ skills. One of the key conditions for teachers to begin to trust in innovation is to gain confidence in their importance and benefits. In order to motivate teachers, we used initial measurements of selected skills of pupils. Our goal is to prove the necessity of systematic monitoring and targeted development of skills through the offered educational activities. Within the national project IT academy, a multiple choice test has been developed to assess skills to making predictions and following directions. The tasks are inspired by the real life situations pupils either have experienced before or it is possible they will experience. The test items have a form of an on-line assignment. The pre testing was conducted at the lower secondary schools joined into national project. Pre-test results are made available to schools to respond by introducing innovative methodologies into their school curricula. In the paper we present selected results of the entrance skills test, analysis of questions focused on the development of individual skill levels and comparison of results depending on the school year of pupils.
Smartphone sensors and video analysis: two allies in the physics laboratory battle field
Authors: Monteiro M , Cabeza C , Stari C , Marti A C
Published: June 2021

Recently, two technologies: video analysis and mobile device sensors have considerable impacted Physics teaching. However, in general, these techniques are usually used independently. Here, we focus on a less-explored feature: the possibility of using supplementary video analysis and smartphone (or other mobile devices) sensors. First, we review some experiments reported in the literature using both tools. Next, we present an experiment specially suited to compare both resources and discuss in detail some typical results. We found that, as a rule, video analysis provides distances or angular variables, while sensors supplies velocity or acceleration (either linear or angular). The numerical differentiation of higher derivatives, i.e. acceleration, usually implies noisier results while the opposite process (the numerical integration of a temporal evolution) gives rise to the accumulation of errors. In a classroom situation, the comparison between these two techniques offers an opportunity to discuss not only concepts related to the specific experiment but also with the experimental and numerical aspects including their pros and cons.
GIREP Community on teaching / learning quantum physics in secondary school
Authors: Michelini M , Pospiech G , Faletič S , Stefanel A
Published: June 2021

The present paper summarizes the building of the GIREP community on teaching and learning quantum physics in secondary school and the results of the community’s first discussion workshop. The questions for the workshop were prepared using feedback from the community members. The participants to the Working Discussion in Budapest Conference were divided in five groups, each focusing on distinct approaches in teaching quantum physics, as identified by the community. The five groups discussed the questions and identified core concepts that any course on quantum physics should cover. They also identified some specificities of each approach and discussed which approaches are particularly well suited or poorly suited to address specific concepts. The paper describes the creation of the community, the process of selecting the questions for the workshop and the results of the discussion on specific questions. The group identified potential research questions that should be addressed with future research. The results are summarized into a short position statement on the future goals of the community.
Quantum Computing for high school: an approach to interdisciplinary in STEM for teaching
Authors: Satanassi Sara , Fantini Paola , Spada Roberta , Levrini Olivia
Published: June 2021

The paper focuses on a Quantum Computing teaching module for high school students that was designed and implemented within the I SEE Erasmus+ project (https://iseeproject.eu) The module is discussed as an example of how the S-T-E-M disciplines can be integrated to stress the conceptual, epistemological, and social relevance of quantum computing. We implemented a three-level approach to introduce quantum technologies without getting lost in the technicalities. The approach has allowed us to highlight the difference between classical and quantum computers and to bring out the interdisciplinary character that characterises the new technologies.
Development and evaluation of introductory physics lab curriculum to promote scientific reasoning abilities
Authors: Koenig Kathleen , Wood Krista E , Bao Lei
Published: June 2021

Research indicates students with more formal reasoning patterns are more proficient learners, while certain critical thinking abilities are important for living in modern society. Unfortunately, college courses do not typically promote these skills. In order to address this concern, we have developed a first semester introductory physics lab curriculum in which students engage in experimental design with emphasis placed on the use of evidence-based reasoning in making decisions in the lab and in report writing. This paper describes the underlying framework on which the curriculum is based and presents data which demonstrates significant shifts in student development of certain aspects of scientific reasoning.
From Dublin descriptors to implementation in Bachelor labs
Authors: Logman P S W M , Kautz J
Published: June 2021

A description of the implementation of a completely renewed setup for Physics Bachelor labs is given. The renewed setup made use of the latest educational research insights and is described from the general Dublin descriptors and the CALOHEE assessment and National domain specific reference frame up to the concrete learning objectives that we aim for in the Bachelor practicals. A choice between more open and closed labs is discussed. This study makes use of educational design research and therefore mostly tests design principles. In general, the design principles behind the renewed setup have worked and students have been given a need to perform each step in the research process. Despite the courses becoming more challenging, students’ results have gone up. We attribute this to specific types of iterations within the closed practicals and on the alternation between closed and open labs. Overall, most students attained the experimental skills that we aimed for and by the end of the practicals in year 2 most students also obtained the most relevant CALOHEE dimension of ‘Experimental design and scientific inquiry’, designed to assess students after year 3. The remaining obstacles are identified and suggestions for future improvements are given.
Bounces of a marble and Zeno’s paradox
Authors: Luca R De , Mauro M Di , Naddeo A
Published: June 2021

The coefficient of restitution of the bounces of a marble on a table is here studied and measured in terms of the total bouncing time. Interesting links arise with mathematics (geometric series) as well as philosophy (Zeno’s paradox), which make our proposal appealing for an interdisciplinary teaching-learning sequence. The relevance of this work for high school and undergraduate students is discussed with emphasis on students’ misconceptions when dealing with infinite processes.
Opinions of Prospective Teachers about Physics-Technology and Physics Teaching
Authors: Çildir Sema
Published: June 2021

In this age, the need for technology literate workforce has increased. The responsibility of teachers has increased in the education systems that will train this workforce. In order for individuals to be trained in accordance with the skills required for the 21st century, it is important to train prospective teachers for these skills. Physics course has an important place in science and accordingly technology. In this study, it was aimed to increase the awareness of prospective teacher candidates on this subject and to develop the skills of researching technology, understanding, and transferring them in accordance with the classroom environment. The study was carried out with a total of 21 students according to qualitative research methods in 2016-2017-2018 fall semesters. They were asked to research the two technologies they wanted, to identify the physics topics within the scope of these technologies, and to transfer this to the classroom environment. Findings were obtained from the data collected through observation, document review and semi-structured interview techniques. At the end of the study, it was determined that prospective teachers increased their awareness about the importance of technology and physics in technology in physics teaching. In addition, it was concluded that prospective teachers wanted to research new technologies and adopt the behaviour of discussing technology in their lessons. It is suggested that these results should be extended to other prospective teachers in order to train individuals not only using technology but also producing it.
Implementing EU Interactive Teaching Methods at Al-Farabi Kazakh National University1
Authors: Akimkhanova Zhuldyzay Ye , Turekhanova Kunduz M. , Karwasz Grzegorz P.
Published: June 2021

This article presents the effectiveness of multimedia tools and communication technologies usage in teaching electricity and magnetism course at al-Farabi Kazakh National University, Kazakhstan. The implementations are based on prepared multimedia packages within EU projects of Didactics of Physics Division at Nicolaus Copernicus University in Toruñ in earlier collaboration with University of Udine, Italy and Charles University, Prague. The implemented packages at KazNU are simple didactical objects (“Physics and Toys”) and “hands-on” experiment in electromagnetism. All implementations were positively evaluated by students, as they lead to an increased didactical efficiency and improve students’ motivation to in self-learning.
Single-shot grating-based phase-contrast imaging of a micrometer sample at a laser-driven x-ray backlighter source
Authors: Akstaller B. , Schreiner S. , Hofmann F. , Meyer P. , Neumayer P. , Schuster M. , Wolf A. , Zielbauer B. , Ludwig V. , Michel T. , Anton G. , Funk S.
Published: June 2021

A single-shot x-ray phase-contrast imaging technique with short exposure time allows to capture sharp images of fast dynamic processes despite low absorption contrast. We demonstrate the capabilities of a robust single-shot grating-based phase-contrast imaging setup at the Petawatt High-Energy Laser for Heavy Ion EXperiments (PHELIX) at the GSI Helmholtzzentrum für Schwerionenforschung GmbH. A static test sample was imaged at 47-fold magnification using a laser-driven high-energy x-ray backlighter source. The retrieved transmission and phase-contrast images yield reproducible results. The reconstructed differential phase-images are quantitatively explained. In addition to the phase-images, propagation signatures are found in the data and used for result verification. The obtained results demonstrate the capabilities of the grating setup which can be used to image microscopic dynamic processes in high-energy density plasma experiments at PHELIX or similar high-power laser facilities.
Fast switching magnet for heavy ion beam separation
Authors: Kutsaev S.V. , Agustsson R. , Hartzell J.J. , Mustapha B. , O'Shea F. , Savin E.
Published: June 2021

This paper presents the design for a switching magnet
capable of deflecting 6.5 MeV/u heavy-ion beams with mass-to-charge
ratio of 7 by 10 degrees. This magnet can produce variable flat-top
pulses from 1 to 30 ms with rise and fall times of less than
0.5 ms at a variable duty cycle of 3–91% into a heavily inductive
load. The magnet has a laminated, iron dominated, H-shaped
core. Directly-cooled copper pancake coils energize the magnet. We
present the magnet design considerations, including the results of
extensive computer modeling. We also present the conceptual
engineering design and the studies of magnet yoke fabrication.
Thermal analysis for fundamental power coupler of HALF 499.8 MHz superconducting cavity
Authors: Tang Y. , Wu C.-F. , Wang L.
Published: June 2021

The preliminary research work of Hefei Advanced Light
Facility (HALF), a fourth generation diffraction limit storage ring,
is in progress. Two 499.8 MHz superconducting cavities may be used
in the HALF RF system. RF power will be feed into each cavity
through a coaxial fundamental power coupler (FPC). Thermal design of
the coupler is very important because of the large power losses on
the coupler will cause overheating. Accurate and fast thermal
analysis is a challenge in the thermal design. In this paper, two
thermal analysis methods for evaluating the cooling effect of the
coupler were compared. Computational Fluid Dynamics (CFD) code is
used to perform thermal-fluid coupled analysis for the coupler in
the first method, which is quite accurate but time-consuming. In the
second method, average convective heat transfer coefficient
calculated by correlation equations based on experimental results is
used to evaluate the heat transfer between the fluid and the cooling
pipe wall. The calculation time of the first method is about four
times that of the second method. The simulation results of the two
methods are consistent well at high flow rate, especially for
turbulent flow. Therefore, the second method was used to perform
thermal simulation under different cooling conditions and RF power
levels. The influence of thermal radiation on the heat load to the
cryogenic environment was also given in this paper. Simulation
results show that thermal radiation has a slight impact on the heat
load. When the copper emissivity equal to 0.02, the total static and
dynamic heat load to 4.5 K are 0.833 W and 2.614 W at the power
level of 200 kW, and the heat load to 4.5 K cryogenic environment
caused by thermal radiation is 0.065 W.
Monitoring The Sea Surface Temperature and Total Suspended Matter Based on Cloud-Computing Platform of Google Earth Engine and Open-Source Software
Authors: Ramdani F , Wirasatriya A , Jalil A R
Published: June 2021

The sea surface temperature and total suspended matter is important for fisheries industry to increase the opportunity to catch the fish. Traditional methods to monitor this phenomenon is by using the remote sensing techniques. However, conventional remote sensing methods is need higher computer specifications as well as larger space of hard disk drive and commercial software to process the datasets. The availability of cloud-computing platform such as Google Earth Engine that available free for public will provide benefit for researcher to increase the efficiency and effectivity of large-scale imageries processing. This study proposed the sate-of-the-art cloud-computing platform of GEE to monitor and map the sea surface temperature and total suspended matter for long periods of analysis of Timor Sea, Van Diemen Gulf, and Beagle Gulf, Australia. In total there more than 600 images of Landsat 8 Collection 1 Tier 1 calibrated top-of-atmosphere (TOA) reflectance is used and obtained within the GEE platform. The Radiative transfer equation (RTE) method is used to extract the surface temperature. To extract the total suspended matter, the Sentinel-3 Ocean and Land Color Instrument Earth Observation Full Resolution (OLCI EFR) is used. The Case-2 Regional CoastColour (C2RCC) processor within the SentiNel Application Platform (SNAP) software is used. The result show that the GEE platform is successfully captured the dynamic sea surface temperature as well as the total suspended matter with high efficiency in term of time and hard disk drive consumption.
Research on Construction Application of Earth and Stone Blasting Technology in Subgrade Excavation Engineering
Authors: Kong Lingqiang
Published: June 2021

It is more difficult to construct stone subgrade than earthwork subgrade, so quality control should be strengthened in every link during construction. In the actual construction process, because the rock or geological structure is complex, blasting technology should be applied to achieve the purpose of earth and stone excavation. However, the application of blasting technology will bring many potential safety hazards, and even cause a large number of casualties in severe cases. Construction units should strengthen construction management, strictly regulate the application of technology, and avoid the occurrence of safety accidents. In order to ensure the high efficiency and safety of construction, the relevant engineering construction departments should fully display their guarantee function and reasonably apply the blasting technology. On the basis of introducing the engineering characteristics, this paper analyzes the construction requirements of earthwork and stone excavation of subgrade, and discusses how to correctly apply earthwork blasting technology in highway subgrade excavation engineering.
Sustainable rural tourism development in the era of social media shape identities and discourse digital settings
Authors: Laxmita N A , Setyaningsih W , Purwani O
Published: June 2021

This paper discusses about sustainable tourism creative initiative in the era of social media & digital settings The essence of a tour is an unusual experience, therefore an authentification of tourist attractions is one of the competitive advantages to meet those needs. So many tourist attractions process and develop to reach that goals without regard to environmental sustainability. Moreover, coupled with the ease of access from social media, tourism actors only aim for bussiness and management excellence. The location of this discriptive qualitative analysis research is in Ponggok Village, Klaten Regency. This study highlights the problem of how perspective of tourism development that shapes identity and meets the needs of today’s digital settings while still paying attention to environmental sustainability. It is necessary to develop scenarios to achieve optimal tourism offers. The purpose of writing this research is to know the perspective of scenario development to get a sensation on a tour by entering aspects of the identity of a place and as a discourse of digital settings. In effort to provide answers, the posibilities for implementation of these technologies for the purpose of research area increasing and have the power to change tourism mobility research as it stands today.
Design of Wireless Power Transfer System for Charging of Electronic Gadgets
Authors: Bhaskar Lala , Kumar Pradeep , Naik Mude Kishore
Published: June 2021

Wireless charging of gadgets is one of the new emerging technologies in the world at present moment. The most common method used is wireless power transfer is by using the method of inductive coupling. Wireless power transfer is one of the simplest and inexpensive ways of charging as it eliminates the use of conventional copper cables and current carrying wires. The inductive coupling technique is used since currently it is the easiest method of wireless power transfer because of high efficiency and large amount of the energy transferred. Its versatility and range of applications the power transferred will be used to charge a battery with the aid of additional circuitry. This research work focuses on the study of wireless power transfer for the purpose of transferring energy at maximum efficiency within a small range or in the near field region. The motivation to this proposed design model is contact less mobile device charging about 5cm-100cm distance range, which can be used to charge the mobile electronic devices like mobile phones, laptops, smart phones wirelessly. This proposed design is very helpful in the pandemic situation to charge electronic gadgets contactless as well wirelessly in the hospitals, public transports like metro stations, educational institutions, and in office communication systems.
Use of sustainable green materials in construction of green buildings for sustainable development
Authors: Patel Prutha , Patel Anant
Published: June 2021

Sustainability in building construction is now major priority as it is having various advantages. The global trend is moving towards the sustainability and hence sustainable building construction has prime importance in the construction industry. Due to huge urbanization activities lot of environmental issues are originating. Building construction using sustainable materials will lead to reduction in the pollution and also improve the existing situation of environmental problems. This paper discusses the use of recycled design products in the construction industry. Affordable sustainable housing projects made from locally available construction materials are in high demand. It safeguards the natural ecosystem, economy, and energy. As a result, the report considers unique products that could fulfil the minimum requirements for sustainable building construction. The primary goal of this research is to do a comparative review to determine the viability of using recycled building materials instead of conventional building materials.
Consequence of Modified Boundary Condition On Natural Convection in a Porous Medium Saturated by Nanofluid – A Computational Approach
Authors: Mitra Asish
Published: June 2021

In the present numerical simulation, steady, laminar, two-dimensional flow in a porous medium saturated by nanofluid [1] along an isothermal vertical plate is presented. Here we have studied a more realistic situation where the nanoparticle volume fraction at the plate (boundary condition) is passively controlled by assuming that its flux there is zero. We employ Boungiorno model [2] that treats the nanofluid as a two-component mixture, incorporating the effects of Brownian motion and thermophoresis. Darcy model is utilized for the presence of porous medium. With the help of appropriate similarity variables, the governing nonlinear partial differential equations of flow are changed to a bunch of nonlinear ordinary differential equations. Afterwards, they are reduced to a first order system and integrated using Newton Raphson and adaptive Runge-Kutta methods. The computer codes are developed for this numerical analysis in Matlab environment. Dimensionless stream function (s), longitudinal velocity (s’), temperature (θ) and nanoparticle volume fraction (f) are figured and outlined graphically for various values of four dimensionless parameters, namely, Lewis number (Le), buoyancy-ratio parameter (Nr), Brownian motion Parameter (Nb), and thermophoresis parameter (Nt). The dependence of the reduced Nusselt number on these parameters is illustrated.
Circulating microRNAs predispose to takotsubo syndrome following high-dose adrenaline exposure
Authors: Couch Liam S , Fiedler Jan , Chick Giles , Clayton Rory , Dries Eef , Wienecke Laura M , Fu Lu , Fourre Jerome , Pandey Pragati , Derda Anselm A , Wang Brian X , Jabbour Richard , Shanmuganathan Mayooran , Wright Peter , Lyon Alexander R , Terracciano Cesare M , Thum Thomas , Harding Sian E
Published: June 2021

Aims 

Takotsubo syndrome (TTS) is an acute heart failure, typically triggered by high adrenaline during physical or emotional stress. It is distinguished from myocardial infarction (MI) by a characteristic pattern of ventricular basal hypercontractility with hypokinesis of apical segments, and in the absence of culprit coronary occlusion. We aimed to understand whether recently discovered circulating biomarkers miR-16 and miR-26a, which differentiate TTS from MI at presentation, were mechanistically involved in the pathophysiology of TTS.

Methods and results 

miR-16 and miR-26a were co-overexpressed in rats with AAV and TTS induced with an adrenaline bolus. Untreated isolated rat cardiomyocytes were transfected with pre-/anti-miRs and functionally assessed. Ventricular basal hypercontraction and apical depression were accentuated in miR-transfected animals after induction of TTS. In vitro miR-16 and/or miR-26a overexpression in isolated apical (but not basal), cardiomyocytes produced strong depression of contraction, with loss of adrenaline sensitivity. They also enhanced the initial positive inotropic effect of adrenaline in basal cells. Decreased contractility after TTS-miRs was reproduced in non-failing human apical cardiomyocytes. Bioinformatic profiling of miR targets, followed by expression assays and functional experiments, identified reductions of CACNB1 (L-type calcium channel Cavβ subunit), RGS4 (regulator of G-protein signalling 4), and G-protein subunit Gβ (GNB1) as underlying these effects.

Conclusion

miR-16 and miR-26a sensitize the heart to TTS-like changes produced by adrenaline. Since these miRs have been associated with anxiety and depression, they could provide a mechanism whereby priming of the heart by previous stress causes an increased likelihood of TTS in the future.