bluuebunny/crossref_metadata_2025 huggingface dataset:
Revealing mitral valve cleft using real-time 3-dimensional echocardiography in children with mitral regurgitation
Authors: Bornaun Helen , Katipoğlu Çağlanur , Dedeoglu Savas
Published: January 2023

Background:Mitral valve cleft (MVC) is the most common cause of congenital mitral regurgitation (MR). MVC may be located on the anterior or posterior leaflets. We evaluated children with moderate-to-severe MR using 3D transthoracic echocardiography (3DTTE) to diagnose MVC and determine the location, shape and size of MVC.
Methods:Twenty-one patients under 18 years of age with moderate to severe MR without symptoms who were suspected of having MVC were in included in the study. The patients’ history and clinical data were obtained from the medical records. 2D and 3D imaging were performed with a high-quality machine (EPIQ CVx). A vena contracta (VC) of colour Doppler regurgitated jet 3-7 and ≥7 mm defined moderate-to-severe regurgitation.
Results: An isolated anterior leaflet cleft (ALC) was detected in four patients, an isolated posterior leaflet cleft (PLC) in 12 patients, and both an ALC and PLC in five patients. VC was higher in patients with ALCs than PLCs (8.85 mm vs. 6.64 mm). Global LV longitudinal strain was lower in the ALC group than in the PLC and both-posterior-and anterior MVC groups (–24.7, –24.3, and –24%, respectively). Global circumferential strain was lower in the ALC group (–28.9%) and similarly reduced in the both-posterior-and-anterior MVC group (–28.6%).
Conclusion:3DTTE for visualisation of the MV can be successfully implemented in children and should be proposed during follow-up. AMVC and bi-leaflet MVC results in severe regurgitation and can cause early systolic dysfunction.
Age, brood fate, and territory quality affect nest-site fidelity in White Stork Ciconia ciconia
Authors: Bialas Joanna T. , Siekiera Joachim , Siekiera Artur , Chromik Wiesław , Dylewski Łukasz , Tobolka Marcin
Published: January 2023

Background
A particular type of site fidelity is faithfulness to the nest site, where birds are not only reoccupying breeding territories but also reusing nests built in previous breeding seasons. Staying faithful to the nest site is believed to be an adaptive strategy, and based on the ability to predict an individual's own breeding success, a hypothesis of “win-stay:loose-switch” was proposed. In this study, we aimed to resolve which factors affect the nest-site fidelity of White Stork Ciconia ciconia, species known for reusing nests available in the breeding sites. Basing on ring recoveries from 31 years of studies in Western and Southern Poland, we analysed the impact of intrinsic and extrinsic factors on nest-site fidelity.
Results
We found that increasing age and breeding success (i.e. producing any fledglings or not) increased the probability of reusing the nest, but in the oldest individuals, the probability decreased. In turn, the probability of breeding success increased with age, the increasing number of reproductive events on the particular nest, and the presence on the nest in the previous year. However, the oldest individuals had lower probability of success, as the relationship was curvilinear. The number of fledglings, however, was influenced only by an individual's age. The number of reproductive events on the nest was, in turn, affected by age, with the youngest and oldest individuals using the current nest for the least number of years.
Conclusions
Our study shows that the decision process of whether to stay faithful to the nest or switch is based on the experience from the previous breeding event, consistently with the “win-stay:loose-switch” hypothesis. Our results also show that site fidelity benefits White Storks, as the probability of breeding success increases if the nest is reused. Results also show the senescence effect that lowers breeding success and site fidelity probabilities.
Evolutionary Cost-Tolerance Optimization for Complex Assembly Mechanisms Via Simulation and Surrogate Modeling Approaches: Application on Micro Gears
Authors: Khezri Amirhossein , Schiller Vivian , Goka Edoh , Homri Lazhar , Etienne Alain , Stamer Florian , Dantan Jean-Yves , Lanza Gisela
Published: January 2023

With the introduction of new technologies, the scope of miniaturization has broadened. The conditions under which complicated products are designed, manufactured, and assembled ultimately influence how well they perform. The intricacy and crucial functionality of products are frequently only fulfilled through the use of high-precision components such as micro gears. In power transmission systems, gears are used in a variety of industries. Micro gears or gears with micro features, with tolerances of less than 5 m, are pushing manufacturing processes to their technological limits. Monte-Carlo simulation methods enable an accurate forecast of inaccuracies in compliance. The complexity of the micro gear's design, on the other hand, increases the simulation computation and runtime. An alternative method for simulation is to create a surrogate model to predict the behavior. This paper proposes a statistical surrogate model to predict the conformity of a pair of micro gears. Afterward, the advantage of the surrogate model enables the optimal tolerances assignment while taking gear functionality, and production cost into account.
Relegation-free closed-form perturbation theory and the domain of secular motions in the Restricted 3-Body Problem
Authors: Rossi Mattia , Efthymiopoulos Christos
Published: January 2023

We propose a closed-form (i.e. without expansion in the orbital eccentricities) scheme for computations in perturbation theory in the restricted three-body problem (R3BP) whenthe massless particle is in an orbit exterior to the one of the primary perturber. Starting with a multipole expansion of the barycentric (Jacobi-reduced) Hamiltonian, we carry out asequence of normalizations in Delaunay variables by Lie series, leading to a secular Hamiltonianmodel without use of relegation. To this end, we introduce a book-keeping analogous tothe one proposed in Cavallari & Efthymiopoulos (2022, CMDA) for test particle orbits interior to the one of the primary perturber, but here adapted, instead, to the case of exterior orbits. We give numerical examples ofthe performance of the method in both the planar circular and the spatial elliptic restrictedthree-body problem, for parameters pertinent to the Sun-Jupiter system. In particular, we demonstrate the method's accuracy in terms of reproducibility of the orbital elements' variations far from mean-motion resonances. As a basic outcome of the method, we show how,using as criterion the size of the series' remainder, we reach to obtain an accurate semianalytical estimate of the boundary (in the space of orbital elements) where the secularHamiltonian model arrived at after eliminating the particle's fast degree of freedom providesa valid approximation of the true dynamics.
Pathfinder elements and indicator minerals of Au from the Kubi Gold Ore Deposits in Ghana
Authors: Nzulu Gabriel K. , Hogberg Hans , Eklund Per , Hultman Lars , Nude Prosper , Yaya Abu , Magnuson Martin
Published: January 2023

The Au mineralization in the Kubi Gold Mining area in Ghana originates from the garnet mineral to ~85% and the rest from magnetite, pyrrhotite, free gold within quartz, calcite, arsenopyrite, and other sulfide groups of minerals which potentially act as possible indicator minerals of Au. For the present work, we collected samples from drill holes at different depths from the alluvia zone (0-45 m) to the ore zone (75-100 m). The distributions of minerals in the rocks were investigated along the drill hole cross sections. X-ray diffraction shows that the samples contain garnet, pyrite, periclase, and quartz as the main indicator minerals. From energy dispersive X-ray spectroscopy, Fe, Mg, Al, S, O, Mn, Na, Au, Cu, Si, and K are identified as corresponding pathfinder elements. The results indicate that the Au mineralization in the Kubi Mine area is controlled by garnet, pyrite, goethite, and kaolinite that grades up to the surface oxides with hematite and limonite alterations.
Indoor resting behavior of Aedes aegypti and Culex spp. (Diptera: Culicidae) in northeastern Thailand
Authors: Seang-arwut Chadapond , Hanboonsong Yupa , Muenworn Vithee , Rocklöv Joacim , Haque Ubydul , Ekalaksananan Tipaya , Paul Richard E. , Overgaard Hans J.
Published: January 2023

Background: Aedes aegypti is a vector of several arboviruses, notably dengue virus (DENV), which causes dengue fever and more severe forms such as hemorrhagic fever. Vector control is currently the main method to control dengue outbreaks. Effective vector control strategies require an understanding of aspects of the bioecology of the vector, including resting behavior. The aims of this study were to investigate the resting behavior of Ae. aegypti in selected houses in northeastern Thailand.
Methods: Mosquitoes were collected in 60 houses in each of two rural and two urban sites in northeastern Thailand. Household characteristics were ascertained. Mosquitoes were collected from May to August 2019 during two collection times (morning/afternoon), in four room types (bedroom, bathroom, living room and kitchen) in each house and at three wall heights (<0.75m, 0.75-1.5m, >1.5m) using a battery-driven aspirator and sticky traps. Collected mosquitoes were identified and dengue virus detected in Ae. aegypti. Association analyses between location, household variables, geckos and mosquito abundances were performed.
Results: A total of 2,874 mosquitoes were collected by aspirators and 1,830 by sticky traps. Aedes aegypti and Culexspp. accounted for 44.8% and 53.2% of the specimens, respectively. Only 2.1% were Ae. albopictus. Ae. aegypti and Culex spp. rested most abundantly at intermediate and low heights in bedrooms and bathrooms. Clothes hanging at intermediate heights were associated with higher numbers of Ae. aegypti in rural settings. The absence of eaves, low wind flow and hanging clothes were associated with more Culex spp. in urban settings. Infrequent use of fogging or larval control was associated with high numbers of Culex spp. and Ae. aegypti. Overall, there seemed to be no clear relationships between sticky-trap collected geckos and Ae. aegypti or Culex spp. abundances.
Conclusions: Knowledge of indoor resting behavior of adult mosquitoes and associated environmental factors can guide the choice of the most appropriate and effective vector control method. Our work suggests that vector control using Targeted Indoor Residual Spraying focusing on walls at heights lower than 1.5 m in bedrooms and bathrooms could be part of an integrated effective strategy for dengue vector control.
Determination of discharge coefficient in non-Boussinesq cases and application in emptying–filling boxes
Authors: Liu Yang , Huang Zhongwei , Hou Siyi
Published: January 2023

The effect of high buoyancy forces due to the density contrast between the fluids at either side of the vent on the discharge coefficient Cd was considered in emptying–filling boxes. Salt experiments were conducted at small scale in a large freshwater tank with saline to generate buoyancy force. In non-Boussinesq cases, a larger discharge parameter Γd at the vent may make plume-like flow contract further with a smaller value of the discharge coefficient. Simple draining flows with variant Cd at the upper vent is modeled when considering the emptying of an enclosure initially filled with a large amount of light fluid. The time in the non-dimensional form for draining light fluid fully out of the space for the analysis with a variable value is twice the time predicted with a constant value of Cd = 0.6. A theoretical model of displacement flow with a virtual source correction at the initial position of an internal source was developed to reveal a time-dependent movement of the layer interface, and comparisons were made with the experimental results. The oscillatory amplitude of the interface overshooting during the transient period was found to depend on a geometrical parameter Λ and a dimensionless parameter Θ that characterizes the source strength relative to the space height.
Paleoceanography with variations in productivity and water temperature in a core from the Campos Basin
Authors: Ferreira Kimmolly Ferrari , Vilela Claudia Gutterres , Gasparini Sarah Pereira
Published: January 2023

To infer changes in paleotemperature and marine productivity based in planktonic foraminifera results, samples from a piston core drilled in the continental slope of the Campos Basin were studied. Qualitative and quantitative studies were performed in 31 intervals of the core as well as the biostratigraphic zones were recognized. Episodes of appearance and disappearance of the menardiform plexus were considered. The genus Pulleniatina, in addition to other guide species, such as Globorotalia truncatulinoides, Gr. crassaformis, Globoconella inflata, and Globigerinella calida were also analyzed. It was possible to identify the Quaternary biozones: Z, Y, X and W. Most of the bioindicator species used to identify changes in paleoproductivity and paleotemperature presented congruent responses, showing more oligotrophic and warmer waters in the Holocene (Z zone) than to the previous Y zone (Late Pleistocene), considered glacial. However, in most of the Y zone, temperatures reconstructed at depths of 100m of the water column were below 20°C, indicating that deeper, nutrient-rich waters may have reached the photic zone during the last glacial period, increasing productivity. During the Y1A subzone, a productivity peak was recognized, which may be associated with the deglaciation period and a high contribution of nutrients from the erosion of the continent. Another peak in the Y2 subzone is associated with a period of water cooling. Zones X and W (Middle Pleistocene) showed higher variations in productivity and water temperature than the upper zones. Zone W, considered glacial, is the zone with the lowest temperature values and the highest productivity of the entire core.
Elective Robotic Partial Colon and Rectal Resections: Series of 170 Consecutive Robot Procedures Involving the Da Vinci Xi Robot by a Community General Surgeon
Authors: Hofeldt Matthew , Richmond Bryan
Published: January 2023

Background

Robotic colorectal procedures may overcome the disadvantages of laparoscopic surgery. While the literature has multiple studies from specialized centers, experience from general surgeons is minimal. The purpose of this case series is to review elective partial colon and rectal resections by a general surgeon.

Methods

170 consecutive elective partial colon and rectal resections were reviewed. The cases were analyzed by type of procedure and total cases. The outcomes analyzed were procedure time, conversion rate, length of stay, complications, anastomotic leak, and node retrieval in the cancer cases.

Results

There were 71 right colon resections, 13 left colon resections, 44 sigmoid colon resection sand 42 low anterior resections performed. The mean length of procedure was 149 minutes. The conversion rate was 2.4%. The mean length of stay was 3.5 days. The percentage of cases one or more complications was 8.2%. There were 3 anastomotic leaks out of 159 anastomoses (1.9%). The mean lymph node retrieval was 28.4 for the 96 cancer cases.

Conclusion

Robot partial colon and rectal resections on the Da Vinci Xi robot can be completed safely and efficiently by a community general surgeon. Prospective studies are needed to demonstrate reproducibility by community surgeons performing robot colon resections.
Evaluating human-computer interaction education based on active learning methods using the CRITIC and TOPSIS approach
Authors: Li Qiaoling , Yin Xiufeng , Yin Weili , Dong Xia , Li Qingqing
Published: January 2023

With the ever-growing development of information technology, the education sector has adopted advanced technologies to improve this field. Different procedures based on human-computer interaction (HCI) can be applied to the efficient interaction between humans and computers to enhance the productivity of computers in various fields, especially in education. Active learning is one of the major technological fields that improves the usability of active learning. With the implementation of HCI approaches such as project-based learning (PBL), active learning classrooms (ALCs), and multi-user virtual environments (MUVE), students’ learning capabilities and teachers’ teaching skills are improved and education becomes more effective. After studying different applications of HCI in active learning, the study proposed to extract common features and select the most efficient ones from them. For the evaluation process, we presented two techniques named Criteria Importance Through Inter Correlation (CRITIC) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) in order to select the most effective HCI approach among various options. We choose nine criteria along with ten alternatives and rank them based on their performance scores. For assigning weights to criteria, we utilized the CRITIC strategy, while the TOPSIS technique is applied for ranking the alternatives. In the proposed study, it is identified that the alternative with the highest performance score is kept in first place, while the alternative with the worst performance score is kept at the bottom. The study concluded that the efficient and effective approach was selected among various options, and it can be employed as a suggestion for decision-related issues and future directions.
The Role of Gestational Diabetes Mellitus and Pelvic Floor 3D-ultrasound assessment during pregnancy predicting Urinary Incontinence: Preliminary results from a prospective cohort study
Authors: Filho Carlos Izaias Sartorao , Nunes Sthefanie K. , Magyori Adriely B. M. , Calderon Iracema M.P. , Barbosa Angelica M. P. , Rudge Marilza V. C.
Published: January 2023

Postpartum urinary incontinence may have a severe impact on women's health. Despite pregnancy and parturition being the most recognized risk factors, methods to identify new pregnant predictor risk factors are needed. Our study investigated the Gestational Diabetes Mellitus, clinical and pelvic floor 3D-ultrasound markers in pregnant women as predictors for 6-18 months of urinary incontinence. This prospective cohort study included nulliparous pregnant women submitted to Gestational Diabetes Mellitus screening in the second trimester. Pelvic floor 3D Ultrasound was performed at the second and third trimesters of gestation to evaluate the pelvic floor muscles and functions. Clinical data, the ICIQ-SF, and ISI questionnaires for urinary incontinence were applied in the third trimester and 6-18 months postpartum. Univariate analysis (P<.20) to extract risk factors variables and multivariate logistic regression analysis (P<.05) to obtain the adjusted relative ratio for urinary incontinence were performed. A total of 93 participants concluded the follow-up. Using the variables obtained by univariate analysis and after adjustments for potential confounders, multivariate analysis revealed that Gestational Diabetes Mellitus exposure was a solid and independent risk factor for 6-18 months of urinary incontinence (Adjusted RR 8.088; 95%CI 1.17-55.87; P:.034). In addition, a higher Hiatal area observed in distension maneuver from the second to third trimester was negatively correlated (Adjusted RR 0.966; 95%CI 0.93-0.99; P:.023). In conclusion, Gestational Diabetes Mellitus was positively correlated with 6-18 months of urinary incontinence, and higher Hiatal area distension was negatively correlated.
Die Verbreitung von Arabis sagittata in Deutschland. Ergebnisse einer Herbarstudie
Authors: Gregor Thomas , Hand Ralf
Published: January 2023

Als Ergebnis einer Herbarstudie wird erstmals eine deutschlandweite Verbreitungskarte für Arabis sagittata vorgestellt. Die zerstreuten Vorkommen liegen vornehmlich im Mittelgebirgsraum und in Beckenlandschaften nördlich bis zur Mittelgebirgsschwelle. Isolierte Einzelfundstellen gibt es zudem im Norddeutschen Tiefland. Die Ergebnisse weichen regional vom Datenstand publizierter Angaben ab. Dies dürfte teilweise auf Verwechslungen mit A. hirsuta beruhen, aber auch der unzureichenden Dokumentation von Herbarmaterial in öffentlichen und zugänglichen Privatherbarien. Insgesamt lässt die Studie jedoch vermuten, dass das Potenzial von Herbarien für die Erstellung von Verbreitungskarten kritischer Sippen bei weitem nicht ausgeschöpft wird.
Validierung des Namens Viola wittrockiana
Authors: Nauenburg Johannes D. , Buttler Karl Peter
Published: January 2023

Der Name Viola wittrockiana Gams (Garten-Stiefmütterchen) war bisher nicht gültig publiziert, trotz anders lautender Angabe im Index Kewensis. In der vorliegenden Veröffentlichung erfolgen Validierung und Typisierung des seit langem eingebürgerten Namens.
Hieracium fallax – Verabschiedung eines vertrauten Namens
Authors: Gottschlich Günter
Published: January 2023

Die taxonomische Umgrenzung und Interpretation von Hieracium fallax war im 19. Jahrhundert sehr unklar und teilweise schwankend. Sie hat dann vor allem durch die Monographie von Nägeli & Peter (1889) eine starke Wandlung erfahren, die mit Beschreibung bei Willdenow (1809) und dem Typus-Material in B nicht mehr übereinstimmt. Die Geschichte dieses Bedeutungswandels wird kurz dargelegt. Der von Bräutigam & Greuter (2007) im Zuge der Ausgliederung von Pilosella aus Hieracium vorgenommene Namenswechsel zu P. setigera Fr. ist zu korrigieren, da für die betreffende "echioides-cymosum"-Zwischenart mit H. cymosiforme Froel. ein älterer Name aufgegriffen werden muss. Die Namen H. cymosiforme, H. fallax und Pilosella setigera werden lectotypisiert und die Neukombination P. cymosiformis vorgenommen.
Beiträge zur Fortschreibung der Florenliste Deutschlands (Pteridophyta, Spermatophyta) – Sechste Folge
Authors: Buttler Karl Peter , Hand Ralf
Published: January 2023

In dem Beitrag sind weitere Nachträge und Korrekturen zur 2008 veröffentlichten "Liste der Gefäßpflanzen Deutschlands" zusammengestellt und kommentiert. 16 Taxa, darunter 1 eingebürgerter Neophyt, müssen der Liste hinzugefügt, 4 Taxa müssen gestrichen werden.
Geschichte der Erforschung der Sommerwurzgewächse (Gattungen Orobanche und Phelipanche)
Authors: Uhlich Holger
Published: January 2023

Teil 2 der Reihe beleuchtet die systematische Erforschung der Gattungen Orobanche und Phelipanche in der Periode von Linnés "Species Plantarum" 1753 bis zur ersten grundlegenden Monographie zur Gattung Orobanche von G. Beck 1890. ein abschließender Abschnitt bringt Ergänzungen zum ersten Teil (behandelte den Zeitraum von den Anfängen bis 1753; Kochia 8: 27–61). Fünf Neukombinationen werden vorgenommen: (1) Myzorrhiza californica subsp. grayana (Beck) Uhlich, (2) Phelipanche mutelii var. nana (Reut.) Uhlich & Rätzel, (3) Phelipanche mutelii var. nana f. manostachys (Beck) Uhlich & Rätzel, (4) Phelipanche caesia var. borealis (Turcz.) Uhlich und (5) Diphelypaea coccinea var. boissieri (Reut.) Uhlich.
Pengembangan Alat Peraga PATOLOGI (Papan Tol Logika) pada Materi Pernyataan Majemuk
Authors: Albany Devin Akbar , Azzahra Fadhilah , Muhtasya Febriandini , Zulkardi Zulkardi , Hapizah Hapizah , Mulyono Budi , Meryansumayeka Meryansumayeka
Published: January 2023

This study aims to develop a valid, practical, and effective teaching aid in learning mathematical logic material. The teaching aid developed is Logic Toll Board named PATOLOGI (Papan Tol Logika). The development model used in this study uses the ADDIE development model. The stages of ADDIE development include analysis, design, development, implementation, and evaluation. Data collection was obtained from observation and interviews, then analyzed descriptively. The results of the research that has been carried out indicate that the PATOLOGI teaching aids have been well developed, starting from the analysis stage to the evaluation stage. The tests carried out included testing the validity of teaching aids to experts, practicality tests and effectiveness tests through trial activities with students. The trial results show that students have no difficulty in using teaching aids, so that teaching aids are said to be practical. The trial results also show that the use of visual aids can arouse students' enthusiasm and interest in participating in learning activities, so that students more easily understand the concepts of mathematical logic material, especially compound statements. This shows that the PATOLOGI teaching aids can be categorized as effective. Thus, it is concluded that the PATOLOGI teaching aid is valid, practical, and effective.
WHEN WALLS BECOME SILENT BATTLEGROUNDS: DECIPHERING COLLEGE STUDENTS’ GRAFFITI WRITINGS ON SCHOOL CAMPUS WALLS
Authors:   School of Teacher Education, Josefina H. Cerilles State College, Dumingag, Zamboanga del Sur, Mindanao, Philippines, Mangila Benjamin Baguio
Published: January 2023

Although graffiti has become a significant cultural and linguistic phenomenon and has been studied throughout history, there is still room for the exploration of how graffiti in different contexts, particularly in a higher education institution, serves to voice the anonymous student writers’ thoughts and feelings. Thus, this study examines the common themes and the lexical and syntactic features of college students’ graffiti writings on the walls of a state college in Zamboanga del Sur, Mindanao, Philippines. Employing thematic analysis, this study reveals that students’ graffiti writings contain a variety of themes such as love, discrimination, self and group identities, hatred, sex, faith and religion, management, education, and fanaticism, with love and discrimination as the most prevailing social themes. Students’ graffiti writings also exemplify distinct lexical features such as loan and swear words, taboo words/expressions, abbreviations, ironies, acronyms, repetitions, and compound words. Borrowings and using offensive or swear words are the most common lexical features found among these graffiti writings. In addition, students often use brief or terse statements to clearly express their thoughts and feelings to the public. Indeed, graffiti writings are a distinctive and silent way of communication, particularly for students who are in the marginalised section of any society.
RELATIONAL PRACTICES IN BALI: BALINESE HINDUISM, SUBAK, AND MUSIC
Authors:   Scripps College, 1030 N Columbia Ave, Claremont, CA 91711, U.S., Huang Hao , Rockwell Joti ,   Pomona College, 340 N College Ave, Claremont, CA 91711, U.S.
Published: January 2023

In a 2019 interview, the musician, dancer, and educator I Nyoman Wenten discussed the centrality of Balinese religious practices, emphasising that sacred artistic offerings and questions about the natural environment are “always intertwined”. What accounts for this kind of intertwinement in Bali? In this article, this question is approached by exploring Balinese Hindu concepts including tri hita karana and sekala/niskala, which are related to post-1945 Balinese Hinduism while also connecting to the millenniumold water irrigation system of subak. Scholarship about subak has mainly occurred in the areas of anthropology, environmental analysis, and tourism related studies, but there are broad connections to Bali’s well-documented musical traditions as well. This article suggests how Balinese ideas about spirituality, engagement with the natural world, and approaches to the arts involve forms of “relational practice”. Some ways in which Bali has hosted a multiplicity of religious and artistic processes that have nurtured productive and enduring relationships among people, nature, and the sacred are discussed. The article proceeds by first providing some history and concepts involving Balinese Hinduism. Then, aspects of subak as social processes akin to artistic practice are considered, after which music and the arts as they relate to concepts including tri hita karana and sekala/niskala are discussed. The article concludes that relational practices are historical traditions to learn from and adapt as ways to navigate a changing present. Regularly shared artistic pursuits and communal offerings are ways of drawing immediate human interactions together with the natural environment and beyond.
Underground mining technologies at the Kekura deposit
Authors:   North Caucasus State Technological University, Aleksandr Sakhnov
Published: January 2023

Research subject and objective is to work out exploration data details to optimize the processes of filling the stoped-out areas when choosing a underground mining technologies for a gold ore deposit. Methods of research include an analytical survey of information about the deposit to improve the quality of mining by minimizing dilution and loss of valuable ores when backfilling with hardening mixtures. Research results. The paper provides data about a gold deposit with complex geological, geographical and operational conditions. Design solutions for mining technology with minimum dilution and loss and for the enterprise’s production capacity development are analyzed. The priority of the ore-hosting rock mass state control performance criterion is substantiated. The criterion refers to production costs considering the damage from losses and dilution. Factors of ore dilution in the course of underground mining are generalized and systematized. Some options for mining systems are recommended as launching. The options of mining by open-pit and underground methods are assessed and the time to reach full production capacity is given. It is shown that in the course of development, technologies containing backfilling with hardening mixtures will be a priority. Recommendations are given to provide raw materials for hardening mixtures preparation by recycling own waste and waste from allied industries. Conclusions. The most promising technology for ore mining by underground method provides for backfilling with hardening materials made through demetallization and disposed component properties control
The Effectiveness of Crowdfunding Promotions on Social Media in Affecting Donation Intention: An Exploratory Survey on Millennials
Authors: Gosal Gladys Greselda , Kenang Irantha Hendrika , Tjahjono Laura Mahendratta
Published: January 2023

Social media has become an effective marketing tool, including donation-based crowdfunding platforms, to reach potential donors. The research aimed to analyze the effectiveness of social media promotion in affecting the online donation intention of millennial generations. With the S-O-R theory, the research used variables like content likeability (S), social media attributes (S), social media engagement (O), perceived credibility (O), and intention to donate (R). Then, quantitative measures were used by distributing questionnaires to the selected sample, and 152 responses were collected. The data were analyzed using SEM. The results show that intention to donate is indeed affected by social media engagement and perceived credibility. On the other hand, perceived credibility is affected by both content likeability and social media attributes. However, the results find that social media engagement is only affected by content likeability and is not influenced by social media attributes. The distinctive finding can be due to the different behavior shown by social media users toward fundraising platforms, as they only want to donate and rarely engage in the fundraiser’s social media. The research calls for further investigation using multidimensional constructs to evaluate the drivers of intention to donate. Alternatively, further research can also be conducted to analyze the behavioral differences between millennials and other generations.
On the determination of spacetime geometry
Authors:   St. Petersburg State University, Drivotin Oleg I.
Published: January 2023

A new approach allowing to determine the metric tensor in various points of the spacetime is proposed. Such approach gives an opportunity to investigate the simultaneity of events not only locally, but also globally, without using of the synchronization procedure, traditionally applied in the theory of the spacetime. On the base of the method of simultaineity determination described in the article, it is possible to construct broad classes of reference frames. As an example, a reference frame is considered, all ovservers of which move with the same arbitrarily changing velocity along some direction.
To the problem of the pursuit in quasilinear differential lag games
Authors:   Tajik State University of Law, Business and Politics, Mukhsinov Edgor M.
Published: January 2023

In the field of the theory of differential games defined in a finite-dimensional space, fundamental works were carried out by L. S. Pontryagin, N. N. Krasovskiy, B. N. Pshenichny, L. S. Petrosyan, M. S. Nikol’skiy, N. Yu. Satimov and others. L. S. Pontryagin and his students consider differential games separately, from the point of view of the pursuer and from the point of view of the evader, which inevitably connects the differential game with two different problems. In this paper, in a Hilbert space, we consider the pursuit problem in the sense of L. S. Pontryagin for a quasilinear differential game, when the dynamics of the game is described by a differential equation of retarded type with a closed linear operator generating a strongly continuous semigroup. Two main theorems on the solvability of the pursuit problem are proved. In the first theorem, a set of initial positions is found from which it is possible to complete the pursuit with a guaranteed pursuit time. The second theorem defines sufficient conditions on the optimality of the pursuit time. The results obtained generalize the results of works by P. B. Gusyatnikov, M. S. Nikol’skiy, E. M. Mukhsinov, and M. N. Murodova, in which it is described by a differential equation of retarded type in a Hilbert space. Our results make it possible to study delayed-type conflict-controlled systems not only with lumped, but also with distributed parameters.
Modeling the process of filling carbon nanocontainers with hydrogen
Authors:   St. Petersburg State University, Egorov Nikolay V. , Vasilyev Alexander A. ,   St. Petersburg State University, Andreeva Tatiana A. ,   St. Petersburg State University, Bedrina Marina E. ,   St. Petersburg State University
Published: January 2023

The problem of storing and transporting hydrogen in containers based on fullerenes and carbon nanotubes is relevant to hydrogen energy. This problem theoretically can be solved using quantum chemistry methods and powerful computer technology to calculate molecules with a large number of atoms, polymers, nanostructures and nanotubes. It is necessary to create a theoretical model of the electromagnetic field in the cavity of fullerene molecules and nanotubes in order to understand how atoms and molecules of hydrogen or any other substances behave in it. Computer simulation of the filling process by hydrogen molecules fullerenes and nanotubes was performed by quantum mechanics methods DFT with GAUSSIAN 09 program.
Photocatalytic fatigue of the polymer nanocomposites
Authors:   St. Petersburg State University, Orekhov Andrey V. , Artem’ev Yurii M. ,   St. Petersburg State University, Pavilaynen Galina V. ,   St. Petersburg State University
Published: January 2023

We discuss the change in mechanical properties of polymeric nanocomposites with photoactive components caused by solar range lighting. Given degradation photoassisted processes are related with the semiconductor nature of component photoactive particles as photocatalysts. Semiconductor particles can be transferred into electron-exited states due to light quanta absorption. One possible way out from these states is through redox electrochemical reactions with neighbor molecules. The redox reactions can produce transformations of polymer structure and composition, decreasing its mechanical strength. The term “photoca-talytic fatigue” denotes a special case of the photo-degradation of polymers resulted only in a change in the strength value of the material. We review not numerous published data on investigations of changes in mechanical properties of polymeric nanocomposite, and mainly in the strength value, arisen from solar range light irradiation. We compare the degradation processes of polymeric nanocomposites containing photoactive components and of the high-cycle fatigue in metals. Likewise, we propose the use of equations of metal high-cycle fatigue curves as a possible approach to mathematical modeling of the processes of polymeric nanocomposites photodegradation. In this, the number of cycles is substitution with exposure time. Especially, the high-cycle fatigue curve equation for the samples with stress concentrations is considered. The experimental parameters of the “photocatalytic fatigue” equation for polymer nanocomposites containing photoactive components are calculated using the Monte Carlo method.
European gas market: Finding a balance between supply and demand sides in the context of the energy crisis
Authors:   St. Petersburg State University, Chernova Elena , Razmanova Svetlana ,   Branch of OOO Gazprom VNIIGAZ in the city of Ukhta
Published: January 2023

Currently, the demand for the supply of liquefied (LNG) and compressed (CNG) gas to the EU regional market significantly exceeds its supply. For the past five years, the gas market in Europe has been exclusively a buyer’s market, аble to dictate the main demand constraints in this market. However, since the autumn of 2021, the trend has changed in favor of suppliers, i. e. the supply side. The trend change occurred due to a number of reasons that led to the fact that world energy prices rose rapidly, reaching such a high level that entire industries, private entrepreneurs and ordinary consumers became insolvent in a short time. The article examines the main suppliers of natural gas to the EU countries, analyzes the dynamics of renewable and non-renewable sources in the production of electricity in the Europe. The possible delivery volumes of major natural gas suppliers, including the supply of compressed and liquefied gas, are analyzed. The purpose of the study is to identify the key causes of the current energy crisis in the European gas market. The research consists in assessing the factors shaping the supply-demand ratio in the regional European gas market in the medium term, as well as in answering the question: will Russian gas really not find its buyer in other regional markets?Conclusions are drawn that the current situation of natural gas supplies from Russia to European countries should be considered from the standpoint of the existing long-term cooperation between Gazprom PJSC and European companies. Otherwise, the European economy will feel the negative impact caused by the shortage of supply оn the gas market.
Prerequisites for ecosystem approach in civic ac- tivity’s organization in modern Russia (part 1)
Authors:   Demidov Yaroslavl State University, Sokolov Alexandr , Palagicheva Asia ,   Demidov Yaroslavl State University
Published: January 2023

The paper is devoted to identify the features of the development of civil and protest activity in modern Russia in the context of the development of digital services and platforms that serve as a prerequisite for the creation of ecosystems in politics. The article presents the results of a monitoring study conducted by a survey of experts in the regions of the Russian Federation from 2014 to 2021. The study also used the results of the analysis of a number of protest campaigns. The theoretical part is devoted to the review of concepts for understanding ecosystems and their specific characteristics, as well as the development of ecosystems in the socio-political sphere. As a result, a number of features of civic activity ecosystems were formulated: the development of digital forms of civic and protest activity, the use of digital services and platforms, multi-channel communication, multiple collaborations, cooperation and horizontal interaction of participants. The ecosystem of civic activity is defined as a set of digital services that form a single interaction infrastructure, as well as the creation of coalitions and cooperating partnerships acting in the interests of their creators. The empirical research`s base contains the results of a survey of experts and an analysis of protest campaigns. In the Russian regions, there is a development of offline and online civil and protest activity, while digital forms of civil action are developing at an accelerated pace. These processes are accompanied by the complication of the structure of internal and external interaction of activists through services and platforms, the totality of which forms the digital infrastructure. Coordination and cooperation of public associations with partners and activists is carried out on the basis of network principles of interaction, which allow to combine the efforts of partners, creating a common digital space for interaction with users. There is a tendency of consolidation of offline and online cooperation of public associations. The results of the study demonstrate the presence of individual elements of ecosystems in the structures of civil society.
Mediatization of communications as a factor of transformation of value orientations of Russian youth: Trends and risks (part 1)
Authors:   St. Petersburg State University, Aleinikov Andrei , Maltseva Daria ,   St. Petersburg State University, Tuzova Polina ,   St. Petersburg State University
Published: January 2023

The purpose of the presented research was to identify the basic value characteristics and potentially conflicting contradictions as a result of the influence of the rapid spread of new media on the audience of modern Russian youth. The first part of the article problematizes the search for theoretical grounds for studying the virtual projection of politics, the methodological background of research on the specifics of the phenomenon of the mediatization of politics. Considering the mediatization effects in the riskological projection, the authors pay special attention to the value attitudes of perception of information about threats, the ideological dominants of the features of political reactions of various social strata. This research aims to contribute to the Russian academic discourse on the specifics of youth media activism, models and practices of its media consumption, new forms and parameters of communication, "digital aborigines". It is concluded that in the conditions of media conflicts, the system of "traditional" values is being desacrated, the struggle of real political interests and parallel/alternative political agendas is taking place, which affects the value political activity of young people and the processes of their self-identification. In the course of the analysis, a fundamentally new knowledge was obtained, based on a holistic vision of the cultural and historical reality of the formation of a "digital society" in Russia, about the axiological features of the modern Russian social order, including a complexly structured set of moral values of youth, the dominant discourses of the value system and ways of alternative vision of the political situation and images of threats and conflicts. The paper examines the "conflict of selection of social problems" in the media communication youth space, algorithms and mechanisms of the clash of beliefs on digital platforms, analyzes media conflicts about the political past and present. In this regard, the article develops a model for measuring and preventing the risks of political and axiological transformations among Russian youth based on the development of complementary methods of their assessment for the construction and implementation of effective state strategies in terms of their change and improvement.
The History of the Russian Church Diaspora in the Third Quarter of the 20th Century in a New Monograph by the Moscow Researcher A. A. Kostryukov
Authors:   Peter the Great St. Petersburg Polytechnic University, Kashevarov A. N.
Published: January 2023

The article analyzes the new book “The Russian Church Abroad under Metropolitan Philaret (Voznesensky), 1964–1985” by the Moscow historian A. A. Kostryukov. Despite the presence of a number of works on the history of the Russian Church Abroad in the 1960s–1980s, major studies that comprehensively characterize the period of the reign of Metropolitan Filaret, before the appearance of the book by A. A. Kostryukov, was not in historiography. The absolute merit of the monograph under review is an objective and unbiased study of the relationship of the Russian Church Abroad with the Moscow Patriarchate and other Local Churches, as well as the exposure of myths, misconceptions and the identification of “blank spots” in relation to a number of topics important for the history of the Church Abroad: the condemnation of ecumenism, unfulfilled hopes in relation to the “catacomb church” in the USSR, on the canonization of the royal family, the new martyrs and confessors of Russia. The monograph also outlines the key problems and important events in the history of other branches of the Russian Church Abroad in the last quarter of the 20th century — the Western European Exarchate of Russian Parishes, which was administratively subordinate to the Patriarch of Constantinople, and the North American Metropolis, which in 1970 received from the Moscow Patriarchate the status of autocephalous (independent) under the name of the Orthodox Church in America. Thus, A. A. Kostryukov studied the complex processes concerning the entire Russian church diaspora, including its connections and relations, both with the Moscow Patriarchate and with other Local Churches and, above all, with the Patriarchate of Constantinople. On the whole, the work under review is the first fundamental work on the history of the Russian Church Abroad in the third quarter of the 20th century.
The Salam transaction in the Islamic tradition and its application in Islamic banking
Authors:   All-Russian Academy of Foreign Trade, Primakov Denis , Rudokvas Anton ,   St. Petersburg State University, Tenberga Inese
Published: January 2023

This article reveals some features of the “Salam” contract which refers to the purchase of a commodity for deferred delivery in exchange for immediate payment. The structure of the Salam Contract changes the logic of ordinary sales contracts, hereby article focuses on differentiation between pre-paid Salam Contract on the one hand and the sales of goods contract (bay’) and the concept of advanced payment on the other hand. Part 2 of the article highlights the Salam Contract as a type of pre-delivery finance instrument based on the Islamic banking theory and practice. As a banking instrument, the salam agreement is primarily aimed at implementing pre-delivery financing of the real sector of the economy, which makes it possible to adjust, plan, replenish and accelerate the turnover of funds of both Islamic banks themselves and their counterparties. Nevertheless, the mechanism of implementing salam in the activities of Islamic banks is primarily aimed at forming contractual relations with reliable and financially stable counterparties. With the help of salam, the Islamic bank acts as a participant in trade in the domestic and foreign markets. Under the Salam agreement, the Islamic bank mainly buys goods whose prices are quoted on international commodity exchanges or on Islamic financial and trading platforms. Along with cooperation with companies operating in the export-import industry, this type of purchase and sale is an effective way of pre-delivery financing of agricultural producers. The article observes also a discussion over Salam Contract application for the market of shares. One point of view on this issue is that the shares have the signs of the individually defined things and thus do not meet the mandatory feature of the salam transaction. Another opinion insists that the shares correspond to all the characteristics of generic items, including the ability to determine their properties and the ability to order (deliver) them. There are also other intermediate points of view.