bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved triplet loss for domain adaptation
Authors: Wang Xiaoshun , Li Yunhan , Zhang Xiangliang
Published: November 2023

A technique known as domain adaptation is utilised to address classification challenges in an unlabelled target domain by leveraging labelled source domains. Previous domain adaptation approaches have predominantly focussed on global domain adaptation, neglecting class‐level information and resulting in suboptimal transfer performance. In recent years, a considerable number of researchers have explored class‐level domain adaptation, aiming to precisely align the distribution of diverse domains. Nevertheless, existing research on class‐level alignment tends to align domain features either on or in proximity to classification boundaries, which introduces ambiguous samples that can impact classification accuracy. In this study, the authors propose a novel strategy called class guided constraints (CGC) to tackle this issue. Specifically, CGC is employed to preserve the compactness within classes and separability between classes of domain features prior to class‐level alignment. Furthermore, the authors incorporate CGC in conjunction with similarity guided constraint. Comprehensive evaluations conducted on four public datasets demonstrate that our approach outperforms numerous state‐of‐the‐art domain adaptation methods significantly and achieves greater improvements compared to the baseline approach.
Compact folded‐shorted patch array offering dual‐band operation and dual‐circularly polarized radiation for picosatellites and other small satellites
Authors: Alshammari Bandar , Alrushud Khalid M. , Li Yuepei , Podilchak Symon K.
Published: November 2023

The development of a dual‐band folded shorted patch (FSP) antenna array is presented which offers dual‐circularly polarized radiation. Applications include small satellites like CubeSats and picosatellites. The proposed 2 × 2 FSP array design operates at 1.1 and 2.4 GHz and offers good radiation performance in terms of minimal reflection coefficient losses, broad beamwidths (which is generally required for low gain antenna structures ensuring link connectivity), as well as low cross‐polarization levels. The antenna array consists of a meandered layer defining the top of the FSPs. The shorting and folding technique as well as the noted meandering allows further size reduction of the quarter‐wavelength patch. In particular, the proposed antenna array is compact with a total size of 50 mm by 50 mm (or 0.18λ by 0.18λ at the lower operational frequency). An eight‐port coaxial and microstrip feed system is integrated onto the backside of the antenna ground plane, two ports for each element, and with external phase feeding of 90°, dual‐circularly polarized is made possible for the compact antenna unit. To the best knowledge of the authors, no similar antenna structure has been designed, manufactured and tested being useful for picosatellites and other small satellites.
DeepFake detection against adversarial examples based on D‐VAEGAN
Authors: Chen Ping , Xu Ming , Qi Jianxiang
Published: November 2023

Recent years, the development of DeepFake has raise a lot of security problems. Therefore, detection of DeepFake is critical. However, the existing DeepFake detection methods are often vulnerable to adversarial attacks, i.e. adding carefully crafted imperceptible perturbations into forged images is possible to evade detection. In this paper, a DeepFake detection method based on image denoising is proposed by combining variational autoencoder (VAE) and generative adversarial network (GAN), namely D‐VAEGAN. Firstly, an encoder is designed to extract the features of the image in a low‐dimensional latent space. Then, a decoder reconstructs the original clean image using the features in this low‐dimensional latent space. Secondly, an auxiliary discriminative network is introduced to further improve the performance of the model, which improves the quality of the reconstructed images. Furthermore, feature similarity loss is added as a penalty term to the reconstruction optimization function to improve the adversarial robustness. Experimental results on the FaceForensics++ dataset show that the proposed approach significantly outperforms the five adversarial training‐based defence methods. The approach achieves 96% in accuracy, which is on average about 50% higher than other comparison methods.
Bridge bottom crack detection and modeling based on faster R‐CNN and BIM
Authors: Gan Linfeng , Liu Hu , Yan Yue , Chen Aoran
Published: November 2023

The bridge bottom crack detection provides important state information for bridge disease control and safety assessment. This paper proposes a detection method based on deep learning Faster R‐CNN and BIM (Building Information Modeling). The UAV (Unmanned Aerial Vehicle) was used for close aerial photography to obtain high‐resolution crack images of the concrete surface at the bottom of a bridge. Through deep learning algorithms, a Faster R‐CNN model is trained and established for crack identifications. The crack identification accuracy rate and recall rate reach 92.03% and 96.54%, respectively. Crack images are mapped to a BIM model developed for the chosen bridge, and the box girder family with cracks and the three crack families of transverse cracks, longitudinal cracks and turtle cracks are established. The cracks are located and the visualization of the beam bridge with cracks was completed. In order to better assess the health condition of the bridge. The results show that the combination of UAV bridge crack detection and modelling solves the remote, visual and automated detection of cracks on the surface of bridge structures, which are difficult to reach manually, and has important scientific research and engineering application value.
Das Eltern-Kind-Spiel – Co-Betätigung
Authors: Godau Kevin
Published: November 2023

Spielen ist die primäre Betätigung von Kindern. Kommt es zu Problemen im kindlichen Spielverhalten, gilt es auch die Co-Betätigung zwischen Kind und Eltern zu betrachten. Dabei helfen verschiedene ergotherapeutische Assessments und Interventionen.
„Eine Win-win- Situation für alle Beteiligten“ – Kostenerstattungsverfahren
Authors: Mischner Julia
Published: November 2023

Im Interview berichtet die Ergotherapeutin und Praxisinhaberin Elke Kumar vom Kostenerstattungsverfahren. Es ermög-licht gesetzlich versicherten Klient*innen, Leistungen bei ihrer Krankenkasse abzurechnen, die eigentlich nur Privatversicherten zustehen. Ein Weg, vollen Wartelisten und dem Fachkräftemangel zu begegnen.
Synthesis of Modified C-Nucleosides of Therapeutic Significant: A Succinct Account
Authors: Mukherjee Debaraj , Hudait Nandagopal , Sakander Norein , Kundu Sanchari , Rasool Bisma , Sengupta Jhimli
Published: November 2023

Since their discovery in the 1950s, C-nucleosides have piqued the interest of both biologists and medicinal chemists. In this regard, C-nucleosides and their synthetic analogues have resulted in promising leads in drug design. Concurrently, advances in chemical syntheses have contributed to structural diversity and drug discovery efforts. Convergent and modular approaches to synthesis have gained much attention in this regard. Among them nucleophilic substitution at C-1 has seen wide applications, providing flexibility in synthesis, good yields, the ability to maneuver stereochemistry as well as to incorporate structural modifications. In this account, we briefly discuss the modular synthesis of C-nucleosides with a focus on mechanistic studies and sugar modifications that have resulted in potent lead molecules. Meanwhile, various FDA-approved C-nucleoside analogues have been reported previously for their antiviral and/or anticancer potential, with examples being pyrazomycin, remdesivir, pseudouridine, and pseudouridimycin.

1 Introduction and Motivation

2 Strategies for the Synthesis of C-Nucleosides

3 Biologically Active C-Nucleosides

4 Mechanistic Analysis of C-Nucleoside Formation

5 Synthesis and Manipulation of Medicinally Important C-Nucleoside Analogues

6 C-Nucleosides: Synthesis of C–C Bonds with a C-1′ Base

7 Conclusion
Discursive representations of sexual minorities in China’s English-language news media: a corpus-based study
Authors: Zhang Ke , Zhuang Huibin , Lu Chao , Zhang Jingyuan
Published: November 2023

In contemporary China, sexual minorities (SMs) are still a marginalized community. Prior studies have accorded SMs a great deal of attention, but little research has been conducted on the representations of lesbian, gay, bisexual, and trans people in Chinese English-language news media. This article uses corpus linguistic tools to examine popular views on SMs in a larger corpus of 354 news articles, filling the gap in research. Based on data collected from four English-language newspapers in mainland China and informed by discursive strategies, the article concludes that Chinese SMs are prominently represented as unhealthy individuals, but also victims and progressionists. The findings also indicate that conservative and liberal perspectives on SMs co-exist in the English-language newspapers. In addition, potential contributing factors to these representations are discussed.
Subject integration and theme evolution of STEM education in K-12 and higher education research
Authors: Zhan Zehui , Niu Shijing
Published: November 2023

Over the past two decades, the field of STEM education has produced a wealth of research findings. This study systematically reviewed the published literature from the perspective of subject integration and theme evolution, considering both K-12 and higher education. It was found that STEM education originated from higher education, but the main emphasis is gradually shifting to the K-12 stage. There were mainly sixteen subjects involved in STEM education, showing the gradual in-depth integration of science, engineering, technology, math, humanities, and social sciences, in which humanism is increasingly emphasized. Culture is a new perspective for understanding the diversity of participants, which also gives STEM education a distinctive regional character. In addition, in the K-12 stage, research related to computer science and art stands out alongside the four main subjects, demonstrating relatively even distribution across research themes. Conversely, in higher education, engineering, and chemistry garner considerable attention, with research themes predominantly concentrated on learning outcomes and social relevance. On a holistic scale, researchers exhibit a pronounced interest in learning outcomes, yet relatively less emphasis is placed on pedagogical aspects. Regarding prospective trends, there should be a heightened focus on the cultivation of students’ thinking competencies, students’ career development, and pedagogy.
Restoration of saturated outputs from microchannel plate photomultiplier tubes in sub-microsecond single-pulse-current mode
Authors: Meng Shijian , Yi Qiang , Zhou Lin , Yan Xiaosong , Yang Jianlun , Ye Fan , Yang Ruihua , Jiang Shuqing , Ning Jiamin , Huang Zhanchang , Xu Zeping , Li Zhenghong , Lu Jian
Published: November 2023

Microchannel plate (MCP) photomultiplier tubes (PMTs) are frequently used in experimental diagnostics, where they are operated in single-pulse current measurement mode. However, considering the significant amplitude fluctuations in the measured signal, the resulting output signal from the MCP-PMT is inevitably distorted by gain saturation. Therefore, understanding the correlation between the MCP-PMT output signal and gain saturation is critical in assessing the extent of output signal distortion and determining the MCP-PMT saturation level. This knowledge allows for a more precise assessment of the input signal's features. In this paper, we present an experimental method for restoring the initial waveform from the saturated MCP-PMT signal. To correct the amplitude-drop caused by gain saturation, our technique involves calibrating the MCP-PMT's relative gain as a function of the accumulated output charge using a square-wave light source. We then applied this approach to restore a ∼500 ns saturated pulse from a double-layer 10 mm diameter MCP-PMT. The restored signal showed a deviation of less than 6% from the reference waveform, which validates the effectiveness of the technique.
Exploring magnetocaloric and heat capacity behavior in Fe doped Mn5Ge3 alloy
Authors: Lalita  , Babu P. D. , Pardeep  , Basheed G. A.
Published: November 2023

Magnetocaloric properties of hexagonally structured Mn5−xFexGe3 (x=0.15, 0.3, and 0.5) alloys have been investigated using DC magnetization and heat capacity measurements. The maxima of entropy change, −ΔSmmax∼5.04(5.57) J/kg K, along with an adiabatic temperature change of ΔTadmax∼5.05(7.25) K was observed for x=0.15(0.5) at an applied magnetic field H=5 T. With the scaling analysis of −ΔSm, the rescaled curves collapse onto a single universal curve anticipated by the mean-field theory, revealing a second-order type of magnetic transition. Furthermore, −ΔSmmax follows a power law of Hn with n=0.597(3), 0.591(3), and 0.586(3) for Mn5−xFexGe3 (x=0.15, 0.3, and 0.5) alloys, respectively. The refrigerant capacity (RC) is increased from 400 J/kg (for x=0.15) to 420 J/kg (for x=0.5) with Fe doping in Mn5Ge3. Moreover, the coefficient of refrigerant performance (CRP) enhances with Fe doping from 0.06 (for x=0.15) to 0.1 (for x=0.5). Thus, high RC and reasonable CRP values for earth-abundant Mn-based Mn–Fe–Ge alloys promise the potential to replace the high-cost rare-earth (Gd) and heavy metal-based metallic magnetocaloric systems for use in environment-friendly magnetic refrigeration technology.
Scalable generalized screening for high-order terms in the many-body expansion: Algorithm, open-source implementation, and demonstration
Authors: Broderick Dustin R. , Herbert John M.
Published: November 2023

The many-body expansion lies at the heart of numerous fragment-based methods that are intended to sidestep the nonlinear scaling of ab initio quantum chemistry, making electronic structure calculations feasible in large systems. In principle, inclusion of higher-order n-body terms ought to improve the accuracy in a controllable way, but unfavorable combinatorics often defeats this in practice and applications with n ≥ 4 are rare. Here, we outline an algorithm to overcome this combinatorial bottleneck, based on a bottom-up approach to energy-based screening. This is implemented within a new open-source software application (“Fragme∩t”), which is integrated with a lightweight semi-empirical method that is used to cull subsystems, attenuating the combinatorial growth of higher-order terms in the graph that is used to manage the calculations. This facilitates applications of unprecedented size, and we report four-body calculations in (H2O)64 clusters that afford relative energies within 0.1 kcal/mol/monomer of the supersystem result using less than 10% of the unique subsystems. We also report n-body calculations in (H2O)20 clusters up to n = 8, at which point the expansion terminates naturally due to screening. These are the largest n-body calculations reported to date using ab initio electronic structure theory, and they confirm that high-order n-body terms are mostly artifacts of basis-set superposition error.
Optimization of injection parameters of a microemulsion-type oil displacement agent for heavy oil recovery
Authors: Liu Tongjing , Xu Derong , Lian Wei , Kang Wanli , Sarsenbekuly Bauyrzhan
Published: November 2023

The conventional viscosity reduction technology through commercial oil-soluble agents for enhanced oil recovery in heavy oil reservoirs has potential safety hazards. In this work, micro-emulsification of heavy oil is proposed as a means of reducing its viscosity for ease of its recovery. The microemulsion-type oil displacement agent was developed, and its performance was characterized by its pseudoternary phase diagram and dynamic light scattering tests. The core tests were used to study the effects of injection volume, injection speed, and subsequent water flooding speed on the oil recovery factors. These results were used to determine the optimal injection parameters. Furthermore, the displacement mechanism for heavy oil was determined based on combined macroscopic and microscopic visual tests. The results showed that the optimal injection volume is 0.15 PV (pore volume), the injection rate is 0.10 ml/min, and the subsequent water flooding rate is 0.20 ml/min. Based on the optimal parameters, the oil recovery efficiency can reach up to 39.83%, which is 25.69% higher than water flooding process. The displacement mechanism of the microemulsion can be divided into three stages. First, when the microemulsion is in contact with the heavy oil, the solubilization occurs spontaneously, and the heavy oil is peeled off from the rock surface. Then, the solvent in the microemulsion interacts with the heavy oil to achieve the viscosity decrease in the heavy oil. Third, during the water flooding process, the viscosity-reduced heavy oil can be emulsified to form oil-in-water emulsion, further realizing the viscosity reduction of heavy oil.
Hyperdialectisms revisited
Authors: Doreleijers Kristel , Swanenberg Jos
Published: November 2023

Ongoing processes of dialect leveling and loss have given rise to the widespread use of the concept of
hyperdialectism in sociolinguistic research. Hyperdialectisms are considered to be a reaction to dialect loss: a typical dialect
feature that is distinctive from the standard language or a neighboring dialect is overgeneralized. However, there is pitfall in
using the concept as an umbrella term for all deviating dialect forms. In this paper, we aim to provide a revisited view of
hyperdialectisms based on written dialect sources. In doing so, we use hyperdialectal adnominal gender marking in southern Dutch
Brabantish dialects as a case study. We show that unexpected forms were already present in early twentieth-century dialect use,
despite dialect grammar descriptions from the second half of the century often being used as a point of reference for ‘correct’
grammar. Furthermore, we argue that the concept of hyperdialectism requires careful layering in sociolinguistic analysis.
A sightseeing diminutive tour in Limburgian
Authors: Jacobs Haike
Published: November 2023

This paper provides an overview, based on the MAND database and on additional recordings for Limburgian Panningen, of diminutive formation in Limburgian and focuses on the status of n-assimilation. It is shown that both the presence and the absence of n-assimilaton poses problems both for existing phonological descriptions as well as for constraint-based approaches to phonology such as standard Optimality Theory. We will show that the nature of the three interacting modifications, that is n-assimilation, k-fronting and s-insertion is different. k-fronting and s-insertion are limited in their application to the diminutive suffix and are as such lexical modifications. n-assimilation is shown to apply also across word boundaries and is a post-lexical modification. This allows for a straightforward description in stratal OT and for a better understanding of the data observed.
Are there different kinds of appositive relative clauses?
Authors: de Vries Mark
Published: November 2023

In his latest book on relative clauses, Cinque claims that there are two fundamentally different kinds of
appositive (non-restrictive) relative clauses. The unintegrated ones are the typical English type, the integrated ones are found
in various languages, including Chinese and Japanese. This second type shares some characteristics with restrictive relatives, and
seems to require a different syntactic analysis. Some languages, like Italian, supposedly have both types. A list of a dozen
criteria differentiates the two, such as the use of relative pronouns and the possibility of heavy pied piping. However, when we
carefully look at Dutch and other languages, the picture starts to blur considerably, and an abundance of (micro)variation shows
up. This is problematic. I argue that the suggested criteria do not add up to two natural classes at all and are in fact
non-explanatory. Therefore, we need to focus on what is truly fundamental to non-restrictiveness, which leads to a different
perspective on the matter.
Teaching listening for interpreting through mind mapping
Authors: Li Xiangdong
Published: November 2023

Interpreting scholars claim that mind mapping can be used pedagogically to enhance trainees’ interpreting-specific listening skills. However, so far relevant empirical studies have been rare. A single-group post and retrospective self-assessment design was used to examine student interpreters’ attitudes towards the use of mind mapping in teaching listening for interpreting and its effectiveness. Eighty-two students were involved as participants. An instruction experience questionnaire was administered at the end of the pedagogical intervention to examine their attitudes towards the mind mapping exercise. Two self-assessments of knowledge and skills were conducted at the end of the pedagogical intervention to investigate their pre-test post-test gains. One was a retrospective self-assessment about their competence before the exercise (then self-assessment) and the other was a post self-assessment about their competence after the exercise (now self-assessment). The results indicate that the participants perceived mind mapping as a positive learning experience and that it was effective in developing students’ interpreting-specific listening knowledge and skills.
Design and analysis of a group-III nitride superlattice structure based semiconductor laser diode for blue region emission
Authors: Sireesha Uppala , Gupta Nikhil Deep
Published: November 2023

The demand for high-power blue laser diodes (LDs) in the range above 2 W has been steadily increasing due to their applications in solid-state lighting, projection displays, high-density optical data storage and underwater communication. However, current designs face limitations in terms of achieving both high power output and efficiency. This work focuses on the design, development and numerical analysis of a blue LD utilizing group-III nitride superlattice structures. The present study aims to overcome design challenges by investigating the fundamental factors affecting the performance of blue LDs based on superlattice InGaN structures through careful device parameter optimization. The results show that our device successfully emits at around 430 nm wavelength and is capable of achieving a differential quantum efficiency of 46.91%, with a maximal optical power output of 2.18 W for 1.71 A of current for a strip width of 15 µm. However, when the strip width is increased to 20 µm, 4.6 W optical power is achieved with 3 A of injection current. Numerical studies are performed with several calibrated physics models and finite-difference time-domain techniques. Our results provide an insight into the potential of using superlattice group-III nitride structures to enhance the performance of blue LDs, opening up new possibilities for high-power and high-efficiency devices in the future.
Novel soliton molecule solutions for the second extend (3+1)-dimensional Jimbo-Miwa equation in fluid mechanics
Authors: Ma Hongcai , Chen Xiaoyu , Deng Aiping
Published: November 2023

The main aim of this paper is to investigate the different types of soliton molecule solutions of the second extend (3+1)-dimensional Jimbo-Miwa equation in a fluid. Four different localized waves: line solitons, breather waves, lump solutions and resonance Y-type solutions are obtained by the Hirota bilinear method directly. Furthermore, the molecule solutions consisting of only line waves, breathers or lump waves are generated by combining velocity resonance condition and long wave limit method. Also, the molecule solutions such as line-breather molecule, lump-line molecule, lump-breather molecule, etc. consisting of different waves are derived. Meanwhile, higher-order molecule solutions composed of only line waves are acquired.
Research on the Coupling Effect of HIRF on UAV
Authors: Ma Zhenyang , Li Mufan
Published: November 2023

The electromagnetic environment of low-altitude airspace has become extremely complex due to the rapid advancement of radio technology. In particular, the electromagnetic energy of HIRF (High Intensity Radiation Field) that is frequently emitted by radar, radio stations, radios, and various ships/airborne impacts negatively aircraft flight safety. In this paper, based on the modeling of a consumer UAV, the HIRF effect is simulated using UWB-HPM, and the electric field variation law at key position and antenna coupling law of the UAV under plane wave irradiation in different directions are analyzed with the help of CST simulation software. The results show that for front-door coupling, the shorter the pulse width of the interference signal is, the stronger the interference for the antenna is, while for back-door coupling, irritation direction and pulse width play a significant role in the coupling effect.
Size Controllable Micro-nano Fluidic Systems Based on Various Angle Sputtering Deposition
Authors: Di Si , Zhang Gong , Yuan Hai
Published: November 2023

Micro-nano fluid systems are widely used in biochemistry and are important to MEMS research. For the fabrication of microfluidic systems, controllable size nanochannels have always been a research challenge. This article proposes a method for fabricating nanochannels based on angle deposition, which can regulate channel size at tens of nanometers. At the same time, DNA molecular stretching simulations and experiments were conducted to verify the application prospects of the sample in the biological field.
Design and Performance Optimization of InGaAs/InAlAs Dopingless Tunnel Field-effect Transistor
Authors: Liu Hu , Zhou Xiaoyu , Li Peifeng , Zhang Wenting
Published: November 2023

In this work, an InGaAs/InAlAs dopingless tunnel field-effect transistor is designed and systematically examined through numerical simulations. In line with the charge plasma concept, the proposed device can not only create a p-n-i-n structure without doping to enhance electron tunneling but also effectively overcome issues caused by doping such as random doping fluctuation, high thermal budget, etc. By investigating the effects of the HfO2 length (L
H), the source-side channel length (L
sc), and the source-drain electrodes structure on the proposed device, it concludes that the best device characteristic can be acquired when L
H is located between 110 nm and 128 nm, L
sc=4 nm, and double source-drain electrodes are adopted.
Study on optical absorption of silicene nanodisks under strain modulation
Authors: Chen Feng , Qi Fenghua , Jin Guojun
Published: November 2023

Using the tight-binding Hamiltonian approach, we theoretically study the position of energy level structures and optical absorption peaks by applying stress forces laterally or longitudinally of triangular zigzag silicene nanodisks (TZSN). We consider the effect of strain on the structure. We found that by applying a lateral force similar to that applied to the stretched structure (the force applied to the compressed structure), all absorption peaks can be observed to move to the left or to the right as a whole in the optical absorption spectrum, and this shift is more pronounced at the main absorption peaks, indicating the possibility of TZSN as a strain sensor, and we also considered which size of TZSN would be more suitable as a sensor. On the other hand, it is found that the compressive strain can effectively reduce the light absorption intensity when the incident energy is less than 1.4 eV (0.89 µm). The work described in the system can be used as new material is applied to the sensor and imaging equipment, etc.
Experimental Study of High Power Microwave Injection in Radar Receiving Front-end
Authors: Hu Xin , Yang Jiangping , Meng Cangzhen , Xu Yi
Published: November 2023

In order to study the tolerance threshold and damage process of radar receiving front end against high power microwave pulse attack, the relationship between the damage of receiving front end and injected signal power, pulse width, and duration was obtained by injection test. The experimental results show that the damage of PIN limiter by high power microwave is a slow worsening process near the damage threshold. Based on the test results, the radar withstanding range of high-power microwave weapon attack is calculated theoretically, which can provide theoretical support for the radar receiving front-end design.
Design of High-efficiency Continuous Class F Doherty Power Amplifier
Authors: Wang Fang , Li Chi , Qu Lili , Peng Yufeng
Published: November 2023

The high efficiency of the saturation state and rollback state is an important part of the front end of modern wireless communication systems. Improving the efficiency of RF power amplifiers is of great significance for energy saving and amplifier performance. Based on the traditional Doherty power amplifier, the harmonic suppression network is introduced before the fundamental frequency matching, so that the second harmonic impedance and third harmonic impedance can achieve continuous class F impedance matching conditions, and then the saturation efficiency and regression efficiency can be improved without affecting the fundamental wave matching. The results of the simulation show that the saturation efficiency of the Doherty amplifier reaches 73.94%~77.22%. The drain efficiency of back-off 6 dB reaches 61.80%~62.92%. The average saturation drain efficiency is 75.58%, and the average back-off 6 dB drain efficiency is 62.36%.
Seeds’ similarity of cultural and natural flora under chloride load in conditions of southern Ukraine
Authors: Pyurko O E , Khrystova T E , Pyurko V E , Arabadzhi-Tipenko L I
Published: November 2023

Saline soils make up almost 25% of the entire earth’s surface. Their areas, unfortunately, have a steady tendency to expand due to the aridization of the climate and the global increase in the average annual air temperature of the planet. The increased concentration of salts in the soil limits the diversity of cultural and conditions the poverty of natural flora, forms areas of risky agriculture in the south of Ukraine. Seeds are a unique product of evolution, the main generative organ of plants, characterized by a number of morphological, physiological and biological features, among which there is adaptation heterogeneity. It is established that by the number of germination days (the seeds of the cultural flora sprouts for 7–10 days, and in wild representatives this indicator extends to 10–12 days) the plants can be arranged in the following order: seven days –Secale cereale L., Triticum durum L., Avena sativa L., Hordeum vulgare L., Helianthus annuus L., Matricaria recutita L.; ten days – Beta vulgaris L., Phaseolus vulgaris L. and twelve days – Valeriana officinalis L. It is found that the most optimal for germination is the aquatic environment, so the plants are arranged according to the list: Helianthus annuus L. → Avena sativa L. → Triticum durum L. → Matricaria recutita L. → Secale cereale L. → Hordeum vulgare L. → Beta vulgaris L. → Valeriana officinalis L. → Phaseolus vulgaris L. It is proved that Na+ and Cl–ions differentially affect the seed germination energy: at a concentration of 0.1% NaCl – Triticum durum L. → Helianthus annuus L. → Hordeum vulgare L. → Secale cereale L. → Phaseolus vulgaris L. → Avena sativa L. → Matricaria recutita L. → Beta vulgaris L. → Valeriana officinalis L.; at a solution concentration of 0.2% NaCl – Secale cereale L. → Triticum durum L. → Helianthus annuus L. → Avena sativa L. → Matricaria recutita L. → Hordeum vulgare L. → Phaseolus vulgaris L. → Valeriana officinalis L. → Beta vulgaris L. The results obtained indicate that the chloride load in the seeds of plants manifests itself in the form of distress as well as eustress. It has been proved that the diagnostic features of chloride hermesis were more clearly manifested in the representatives of the cultural flora than the natural ones.
MILP formulation of the UC-problem with boundary conditions on the autonomous forecasting horizon
Authors: Saukh S Ye
Published: November 2023

The intervals for determining the variables in the standard MILP-formulation of the UC-problem are analyzed. The need to take into account the state and load values in the pre-forecast and post-forecast time has been established. The suitability of the standard MILP-formulation of the UC-problem, problem with initial conditions, for solving dispatch control problems and the unsuitability of such a formulation for solving the generation capacity planning problems is shown. The standard MILP-formulation of the UC-problem on the cyclical forecasting interval is proposed. The suitability of the proposed MILP-formulation of the UC-problem for its application in the problem of planning the development of the generation capacity of power systems with a large share of RES is shown.
Analysis of the dynamics of the development of alternative energy plants in terms of their connection to the power transmission networks
Authors: Lukashevych Ya P
Published: November 2023

In this article, the author presents an original approach to analyzing the dynamics of power plants’ development with renewable energy sources. This approach is based on the characteristics of their connection to (high-voltage or distribution) power transmission networks during both the pre-war and post-war periods. The article describes the impact of military aggression on the current status of power generation from alternative energy sources. The article not only suggests the main directions of post-war reconstruction but also defines approaches to developing regulatory mechanisms to promote the growth of renewable energy at the regional power system level of the United Energy System of Ukraine.
Numerical simulation of the surface subsidence evolution caused by the flooding of the longwall goaf during excavation of thin coal seams
Authors: Sakhno I , Sakhno S , Petrenko A , Barkova O , Kobylianskyi B
Published: November 2023

Underground mining has a significant influence on ground movement, which induces serious environmental disturbances on land. Movements of the rock strata can be the cause of changes in the hydrogeological regimes of groundwater. As a result, the risk of flooding of the longwalls goaf increases. The specific phenomenon of the Ukrainian Donbas is the flooding of the underground roadway system at the result of the closure of the mines. Water saturation of rocks leads to a decrease in its strength. The result is repeated subsidence. The activation of the ground movement processes over the longwall goaf due to their flooding has not been studied enough. In this paper, for the geological conditions of thin coal seams typical for the Ukrainian Donbas, ground movement evolution caused by flooding of longwalls goaf was studied. Ansys code was used to analyze the evolution of surface displacement in different hydrogeological conditions. As a result of numerical simulation, it was found that full flooding of the longwall goaf leads to an increase in surface subsidence by 22.4%, while the length of the trough increase by 1.3%. Maximal inclination increases by 34.4%, and maximal curvature – by 74%. This contributes to a significant increase in hazards for surface infrastructure located on the edges of the subsidence trough. The control of the negative impact on surface infrastructure objects, water and agro-industrial objects can be ensured by a timely prediction of ground movement and the implementation of surface controlling methods to prevent critical surface deformations.
Engineering method for predicting the displacement of the earth’s surface under the influence of stope workings of coal mines
Authors: Oleinichenko A , Filatieva E , Filatiev M , Rudniev Y
Published: November 2023

The development of a sufficiently reliable forecast of the values of trough parameters on the earth’s surface and the displacement of undermined rocks using mathematical modeling methods is an urgent problem for mining. Not only the protection of objects on the earth’s surface depends on its successful solution, but also the choice of the location of mine workings and rational ways to protect them from the influence of rock pressure, the forecast of gas release from undermined sources, the occurrence of gas-dynamic phenomena, the rationale for rational ventilation schemes for excavation areas, the calculation of the bearing capacity supports and many other engineering tasks. The study is based on the use of experimental data obtained during the operation of a separate extraction area, respectively, at the first stage when the working face is removed from the split furnace and at the second stage above the working face when it is sufficiently removed from the open working. This makes it possible to obtain all the necessary experimental data for constructing a general scheme for the development of clearing operations and the formation of a trough for the displacement of the earth’s surface in two stages. On the basis of the studies carried out, it was found that the maximum subsidence of the earth’s surface above the cut working with a sufficient distance from the production face is equal to the subsidence above the production face at the stage of attenuation of the processes of displacement of undermined rocks and the earth’s surface. This gives grounds to make an assumption about the closeness of the displacement parameters of the stationary and dynamic semitroughs.
Transformational processes of ensuring sustainable urban development: the realities of Ukraine
Authors: Kuzmak O I , Kuzmak O M
Published: November 2023

The purpose of the study is to determine the state of transformational conversions in Ukraine on the way to achieving the goals of sustainable development, in particular, the condition of the development of cities and communities. With this goal, an analysis of Ukraine’s position according to indicators of sustainable development in dynamics was carried out. It has been established that Ukraine is committed to the values and goals of sustainable development. An assessment of measures regarding the adaptation of sustainable development goals in Ukraine was conducted. It has been found out, that Ukraine has made progress in achieving twelve of the 17 goals that determine the country’s sustainable development in the economic, social, and environmental spheres, including SDG 11 “Sustainable cities and communities”. The state and amounts of financing of the “Stable cities and communities” goal were analyzed, and the disadvantages of the Ukrainian system of state strategic planning and budgeting were identified. Proposals regarding the innovative nature of economic development in the context of sustainable development of cities and communities have been researched and substantiated. Approaches to the management and development of cities and communities are proposed, which should be based on inclusiveness, safety, and sustainability principles.
Problems of the development of cultural tourism in the Carpathian region: the vision of consumers and service providers
Authors: Arkhypova L M , Korobeinykova Y S , Hryniuk V I , Kachala S V , Pobigun O V
Published: November 2023

Tourism development in Ukraine has improved in terms of tourist flows, both as a diversification of tourism demand and tourism products in the last decades. Cultural tourism is a promising direction of tourist activity and occupies a leading position in the modern global tourist management system. The object of research is cultural tourism within the tourist destination of the Ivano-Frankivsk region. Regarding this, the authors revisit the phenomenon of cultural tourism in the country, in order to identify cultural tourism potential through cultural consumption among tourists, applying a special tourism survey. The purpose of this research is to identify the main problems of the development of cultural tourism in the Carpathian region from the point of view of demand and supply of cultural tourism programs based on the results of a comprehensive sociological study on the evaluation of tourist objects and the possibility of their inclusion in the cross-border tourist product “Carpathian Cultural Route”. The results of the survey demonstrated responses from 264 consumers of cultural tourism, which is 2,5% of the number of tourists (general population), and 140 respondents – employees of cultural institutions (objects of cultural tourism), the calculated sample of which was 28% of providers of cultural tourism services. The estimated sample was 28% of cultural tourism service providers. Among the positive aspects of the visit, tourists noted the price policy of institutions acceptable to them, the high level of authenticity and historical and cultural value of objects, the appropriate quality of service, and emotional comfort when visiting cultural and historical objects. According to consumers, the main problems of the development of cultural tourism are the low level of infrastructure support of objects and tourist destinations in general, the limited range of additional services, and limited information about the object. The authors emphasize the importance of developing culturally coherent policies to increase the competitiveness of tourist destinations. The most significant problems of the development of cultural tourism from the point of view of employees of tourist objects of cultural tourism are low level of infrastructure development of cultural tourist objects and tourist destinations in general, insufficient financing of institutions, low level of monetization of objects, low level of tourist and cultural activities in a tourist destination, insufficient advertising of the tourist object, imperfection of state tools for regulating tourist activity within cultural objects, low qualification of employees. Scientific developments on this topic will foster the application of innovative approaches towards the differentiation of cultural tourism objects, which, as a consequence, will help to target potential consumers and improve cultural tourism programs.
Ecofacilitative pedagogy as a form of sustanability and social therapy
Authors: Lushyn P V , Sukhenko Y V
Published: November 2023

This article raises the question of the role of non-formal and hybrid education as a form of personal and social sustainability in the war-time adversity. The authors attempt to estimate the role of the eco-facilitation course as one of the original Ukrainian approaches to psychological assistance. The course was provided to different categories of students (displaced and relocated within Ukrainian borders or with a refugee status in Europe and USA). It was found that experimental training by the method of ecofacilitative teaching contributes to individual and social sustainability in terms of rhythmic development (thesis-antithesis-synthesis). In particular, the changes in pedagogy reflect the logic of their non-directive teaching (ecofacilitation). Ecofacilitation is an educational course aimed at developing skills for sustainable self-development or personal stabilization in conditions of instability and chaos, which closely corresponds to the living conditions of an individual during wartime.
Digital economy: place of Ukraine in global trends of sustainable development
Authors: Pavelko O V , Doroshenko O O , Los Z V , Vashai Yu V , Zinkevych O V
Published: November 2023

The research of the Ukraine’s place in global trends of sustainable development from the position of digital economy is presented. An economic essence of digital economy and its significance for Ukraine is studied. Its main components are defined. The relationship between the digitalization of the economy and the level of sustainable economic development is substantiated. Considering the fact that the development of the digital economy is characterized by a large number of indicators at the global level, the Global Connectivity Index is chosen to analyze the relationship with the SDGs achievement. The hypothesis about the dependence of SDGs achieving on the possibilities of the digital economy is confirmed with the help of mathematical modeling using correlation-regression analysis. The analysis of the relationship between Global Connectivity Index and SDGs Index is conducted. The level of influence of GCI component groups (broadband, cloud, AI, IoT) on the levels of SDGs is determined. Based on the analysis two components of the GCI index – the Internet of Things and the state of the broadband Internet, which have a significant impact on the level of SDGs achievement, are identified by the authors. It was found that two other components – the development of artificial intelligence and cloud technologies have a moderate impact on SDGs achievement. The global map of the digital technologies development level in compliance with the SDGs achievement is presented. Visualization on the map makes it possible to group countries with a high level of digitalization and achieving the SDGs on the one hand, and a high level of digitalization and relatively low indicators of sustainable development on the other hand, and vice versa. The analysis of Ukraine’s place on this world map is performed. The role of digital transformation in achieving of the defined SDGs is identified.
Study of the energy parameters of the system “solar panels – solar inverter – electric network”
Authors: Nerubatskyi V P , Plakhtii O A , Hordiienko D A , Khoruzhevskyi H A
Published: November 2023

The article presents the results of research into the process of transferring electrical energy from solar panels through a hybrid solar inverter to a three-phase electrical network. An automatic regulation system is presented, which provides power regulation and operation in the mode of maximum power selection from solar panels. The results of the study of the energy efficiency of the system, the parameters of electromagnetic compatibility and the emission of higher harmonic currents are presented.
Heap leaching of gold from the destructured oxidized ore of the Belsu deposit, Republic of Kazakhstan
Authors: Bolotova L S , Shalgymbayev S T , Raipov S K , Surimbayev B N , Kanaly Ye S , Kurmanov Zh E
Published: November 2023

Heap leaching technology is increasingly being used to extract metals from poor ores, especially in the gold mining industry and is characterized by low capital costs compared to other methods. The purpose of this work is to develop modes and indicators of heap leaching of gold from the destructured oxidized ore of the Belsu deposit, Kazakhstan. The material composition of the ore has been studied, studies of percolation and pelletizing modes have been carried out. For the first time, studies on heap leaching for oxidized ore of the Belsu deposit (Kazakhstan) were conducted. It has been established that gold is well extracted by heap leaching from ore crushed to -25 mm and -12 mm after preliminary pelletizing. The degree of dissolution of gold from ore with a size of -25 mm and -12 mm has similar values – 74.41% and 76.57%, respectively. The leaching tails contain 0.478 g/t and 0.440 g/t gold. The consumption of sodium cyanide did not exceed 0.47 kg/t. The expected extraction of gold into the Dore alloy will be 66.60-68.53% with an initial gold content of 1.87-1.88 g/t in the ore. According to the developed technology, an industrial plant for heap leaching of gold from oxidized ore of the Belsu deposit was built.