bluuebunny/crossref_metadata_2025 huggingface dataset:
Features of complex calculation ejection cooling system charge air in diesel
Authors: Lazarev E. A. ,   South Ural State University, Chelyabinsk Russian Federation, Salov A. Y. , Pomaz A. N. , Lazarev V. E. ,   Joint Stock Company Special Design Bureau “Turbina”, Chelyabinsk Russian Federation,   Joint Stock Company Special Design Bureau “Turbina”, Chelyabinsk Russian Federation,   South Ural State University, Chelyabinsk Russian Federation
Published: August 2024

The expediency of increasing the density of fresh charge at the inlet to the cylinder of a diesel engine with a gas turbine boost by using an ejection cooling system after the compressor to circulate cooling air through the cooler is substantiated. The urgency of improving the cooling systems of the charge air is noted in the direction of reducing the cost of power for operation and simplifying the design of their elements. The functional and design features of the elements of the charge air ejection cooling system are considered. The incompleteness of studying the functioning of the ejector at the outlet for intensive circulation of cooling air through the cooler matrix when placing the ejector after the turbocharger turbine is noted. The sequence of calculation of the system in the form of a block diagram is proposed, including a diesel engine, a compressor and a turbocharger turbine, a charge air cooler and an ejector in the exhaust system. The main factors characterizing the relationship between the functional and geometric parameters of the system elements are considered. The features of the complex calculation of the ejection cooling system for charge air in a diesel engine using mathematical modeling of processes in various elements of the system to find reserves and compromise solutions to reduce the cost of power for its operation and increase its efficiency are reflected. The results of the complex calculation of the ejection cooling system of the charge air using numerical modeling are presented graphically in the form of dependences of the parameters of its elements on the degree of pressure reduction in the turbocharger turbine. The analysis of the results of the complex calculation shows that the maximum values of the degree of cooling, charge air density and effective diesel power are achieved at different degrees of pressure reduction in the turbine or ejector. In this regard, it is concluded that it is advisable to choose the required values of the degrees of pressure reduction in the turbine or ejector on a compromise basis when designing an ejection cooling system for charge air.
Graphical ways to implement the same stroke of pistons of V- and W-shaped engines with trailed connecting rods
Authors: Maslov A. P. ,   GSKBD “Transdiesel” LLC “ChTZ-URALTRAK”, Chelyabinsk Russian Federation, Zadorozhnaya E. A. ,   South Ural State University, Chelyabinsk Russian Federation
Published: August 2024

This article presents empirical methods of graphical research on the implementation of the same stroke of pistons of V-shaped engines with trailed connecting rods. According to the authors, at a certain stage of research, it is advisable to perform a graphical construction, which could to be more reliable and less costly to use any programs related to determining valid technical and design parameters. Obviously, it is advisable to use two- or three-dimensional modeling based on automatic design systems “Kompas” as a technical tool for achieving the goal. At the first stage, it is enough to design using a two-dimensional modeling system, which allows to asses the ratio of the basic geometric dimensions and possibility of further design. The three-dimensional modeling system allows you to into account the ratio of the parts given their geometric shape and changes in position within the permissible limits of the internal space of CCM and CPG of engine. The peculiarity of graphical research methods involves analysis of the geometric dimensions of the parts and their relative position in a particular engine. In this case, it is advisable to consider the design of CCM of V-shape engines, for example of type V-2, whose peculiarity is to the design of CCM with a trailed connecting rod and to get different stroke of pistons in the main and side cylinders of the engine. In this case, the problem of organizing the identical running of the engine work is connected with the problem of obtaining the same coefficient of excess air, but then the fuel supply to the engine cylinders will be different. The method of shifting the intersection point of the cylinder axes, analyzed in the work, allows the method to be used not only to obtain sufficient space for the pistons at bottom dead center, but also to ensure conditions for the same stroke of the pistons of V- and W-shaped engines.
Development of a vibratory working organ of a subsoiler
Authors: Khazov I. E. ,   Chelyabinsk Compressor Plant LLC, Chelyabinsk Russian Federation, Rakhimov I. R. , Rakhimov R. S. , Alyabiev V. A. ,   South Ural State University, Chelyabinsk, Russian Federation,   South Ural State University, Chelyabinsk, Russian Federation,   South Ural State University, Chelyabinsk, Russian Federation
Published: August 2024

The article considers the design of a vibrating working body of a subsoiler, developed for a method of tillage that improves energy and agrotechnical performance. Deep loosening of the soil allows to improve the quality of tillage. Based on the results of the analysis of the working bodies of the tools and methods for reducing the traction resistance of deep diggers (according to the type of working body, the layout of the working bodies on the frame of the tool, the use of vibration of the working bodies), a design solution is proposed that will significantly reduce the traction resistance of the soil to the working body, – the use of vibration in the proposed design using vibrators, which will allow, including It is necessary to reduce energy costs when performing basic tillage. The study of the properties of cultivated soils using vibration made it possible to substantiate, in accordance with the purpose set in the work, a constructive scheme for transmitting vibration to the working body of a tillage. A mathematical model is proposed for determining the traction resistance of a deep loader, which allows calculating the magnitude of the forces acting on the rack of the working body, as well as on a component of its design – a vibrating chisel. The refinement of the traction resistance of the chisel by the resulting centrifugal force of inertia of its rotating element (eccentric) makes it possible to assess the degree of vibration of the working body on the soil. When determining the parameters of the mathematical model, the values of the parameters of the working bodies of deep-diggers and chisels in the conditions of stony soils of the Southern Urals were used. For the calculated scheme of the working body, its design parameters were determined, and a significant decrease in the traction resistance of the chisel gun using a vibrating chisel was obtained. An experimental study of the designed and manufactured prototype of a working organ with a vibrating chisel, conducted in laboratory conditions in accordance with an updated methodology, confirmed the calculated data on reducing traction resistance and improving agrotechnical soil parameters.
Numerical simulation of chip formation during edge cutting machining of 3D orthogonal woven fiber-reinforced composite workpiece. Part 1: A review and models of materials.
Authors: Shchurov I. A ,   South Ural State University, Chelyabinsk Russian Federation, Shchurova E. I. , Volf G. V , Morozov A. V. ,   South Ural State University, Chelyabinsk Russian Federation,   South Ural State University, Chelyabinsk Russian Federation,   Vladimir State University named after A.G. and N.G. Stoletovs, Vladimir Russian Federation
Published: August 2024

Edge cutting machining is more commonly used to produce precise parts made of fiberreinforced composite (FRC) with three-dimensional woven orthogonal structure. The disadvantage of this machining method is increased hairiness of the machined surface, fiber-matrix debonding, peeling and chipping. One possible solution to minimize this disadvantage is to use rational tool parameters and rational tool wedge motion in relation to the axes of the fibers. Such motion can be identified using numerical computer micro modeling of the chip formation process. The difficulty of such modeling it the need to have available both a geometric model of the composite itself and models of composite components, including a model of matrix-fiber boundary layer. Modeling based on the method of smoothed particle hydrodynamics -Smooth Particle Hydrodynamics (SPH) is the most promising type of machining process micro modeling. Currently, no publications, which present SPH micro models of three-dimensional woven composites with the description of matrix-fiber boundary layers, have been found. It was also not possible to find specific models for the matrix-fiber boundary layers. In order to solve the problem of rational machining of FRC workpieces using edge cutting tools, an analysis of published material models and parameters of such models was carried out. These models should be subsequently used for SPH modeling of the machining process. The analysis made it possible to select the required material models and their parameters for fiber and matrix materials of a metal composite. The analysis of the graphical relationships obtained from the publications, made it possible to select the parameters for the fiber-matrix boundary layer model. This selection is based on the hypothesis that the boundary layer should be described by the same model, that is used for the matrix itself, but with parameters that determine lower failure stresses. The obtained solutions are planned to be used to simulate machining process of a workpiece made of three-dimensional woven FRC in the second part of the presented research.
(Grün) Open Access von unten organisieren: Erfahrungen und Ergebnisse aus dem Projekt GOAL
Authors: Corredera Nilsson Enrique , Andres Valérie
Published: August 2024

Die Wissens- und Publikationskultur von Fachhochschulen und Pädagogischen Hochschulen fokussiert auf angewandte Wissenschaft und Berufsalltag. Ihre Forschungsergebnisse richten sich häufig an ein Publikum am Rande der akademischen Welt. In der Open-Access-Landschaft wurden praxisorientierte Publikationen bisher jedoch wenig beachtet. In unserem Beitrag berichten wir über die Lösungen und die Organisation hinter dem Projekt GOAL, das die Förderung von Green OA bei praxisorientierten Zeitschriften in der Schweiz zum Ziel hat.
Development and validation of a novel 7α-hydroxy-4-cholesten-3-one (C4) liquid chromatography tandem mass spectrometry method and its utility to assess pre-analytical stability
Authors: Atkins Jonathan S. , Keevil Brian G. , Taylor Angela E. , Ludwig Christian , Hawley James M.
Published: August 2024

Objectives

7α-Hydroxy-4-cholesten-3-one (C4) is the common intermediary of both primary bile acids. C4 is recommended by the British Society of Gastroenterology for the investigation of bile acid diarrhoea (BAD) in patients with chronic diarrhoea. This project aimed to develop and validate an assay to quantitate C4 in serum and assess the stability of C4 in unseparated blood.

Methods

Accuracy was underpinned by calibrating to quantitative nuclear magnetic resonance analysis. C4 was analysed in a 96-well plate format with a deuterated C4 internal standard and liquid-liquid extraction. Validation followed the 2018 Food and Drug Administration guidelines. To assess C4 stability, healthy volunteers (n=12) donated 8 fasted samples each. Samples were incubated at 20 °C for up to 72 h and retrieved, centrifuged, aliquoted and frozen for storage at different time points prior to C4 analysis.

Results

The C4 method demonstrated excellent analytical performance and passed all validation criteria. The method was found to be accurate, precise, free from matrix effects and interference. After 72 h of delayed sample separation, C4 concentration gradually declined by up to 14 % from baseline. However, the change was not significant for up to 12 h.

Conclusions

We present a robust method of analysing serum C4, offering a convenient alternative to 75SeHCAT for BAD investigation. C4 was found to decline in unseparated blood over time; however, after 12 h the mean change was <5 % from baseline. Our results suggest C4 is suitable for collection from both primary and secondary care prior to gastroenterology referral.
GIT quotient of holomorphic foliations on ℂℙ2 of degree 2 and quartic plane curves
Authors: Alcántara Claudia R. , Vásquez Aquino Juan
Published: August 2024

We study the quotient variety of the space of foliations on

ℂ
⁢

ℙ
2

{\mathbb{CP}^{2}}

of degree 2 up to change of coordinates. We find the intersection Betti numbers of this variety. As a corollary, we have that these intersection Betti numbers coincide with the intersection Betti numbers of the quotient variety of quartic plane curves. Finally, we give an explicit isomorphism between the space of foliations of degree 2 with different singular points, without invariant lines and the space of smooth quartic plane curves.
A note on conjugacy of supplements in soluble periodic linear groups
Authors: Trombetti Marco
Published: August 2024

The aim of this short note is to prove that if G is a (homomorphic images of a) soluble periodic linear group and N is a locally nilpotent normal subgroup of G such that N and

G
/
N

{G/N}

have no isomorphic G-chief factors, then two supplements to N in G are conjugate provided that they have the same intersection with N. This result follows from well-known theorems in the theory of Schunck classes (see [A. Ballester-Bolinches and L. M. Ezquerro,
On conjugacy of supplements of normal subgroups of finite groups,
Bull. Aust. Math. Soc. 89 2014, 2, 293–299]), and it appeared as the main theorem of [C. Parker and P. Rowley,
A note on conjugacy of supplements in finite soluble groups,
Bull. Lond. Math. Soc. 42 2010, 3, 417–419].
Prevalence of restless legs syndrome during pregnancy and postpartum period
Authors: Lepuzanovic Muhamed , Sinanovic Osman , Aziraj-Smajic Vildana , Kapic Dzevada , Basagic Edin , Muftic Mirsad
Published: August 2024

Objectives

Restless legs syndrome (RLS) is a disease from the spectrum of movement disorders, the prevalence of which increases significantly during pregnancy and is associated with poor sleep, a drop in daytime energy, and the development of psychological disorders during pregnancy and the postpartum period.

Methods

The IRLSS scale was used to determine the presence of RLS symptoms. The total test sample that included the tested and control groups was (n=390) subjects. The examined group consisted of pregnant women (n=260), and the control group consisted of female students (n=130). In total, 260 pregnant women were monitored 6 months after pregnancy. Three measurements were performed, first in the third trimester of pregnancy, second two months after delivery, third 6 months after delivery, while one cross-sectional measurement was performed for the control group.

Results

The prevalence of RLS in pregnancy is highest in the third trimester and amounts to 26.5 %. In the postpartum period, a significant decrease in the prevalence of RLS was observed, measured two months after delivery (18.1 %). Postpartum, over time, a decrease in the prevalence of RLS was noticed, and six months after delivery it was (7.3 %), when it practically approached the prevalence of the control group (standard population) which was (6.2 %).

Conclusions

The prevalence of RLS is highest during the third trimester of pregnancy and decreases after delivery so that 6 months after delivery it approaches the prevalence of the standard population.
Uterine isthmic tourniquet left in situ as a new approach for placenta previa-accreta surgery: a comparative study
Authors: Bağlı İhsan , Öcal Ece , Bala Mesut , Tahaoğlu Zelal , Bakır Mehmet Sait , Halisçelik Mesut Ali , Bademkıran Cihan , Gül Erdoğan
Published: August 2024

Objectives

Placenta previa-accreta spectrum disorders are a cause of obstetric hemorrhage that can lead to maternal fetal mortality and morbidity. We aimed to describe the use of a uterine isthmic tourniquet left in situ as a new uterus-preserving approach for patients with placenta previa-accreta.

Methods

In this retrospective comparative study, the patients who underwent surgery for placenta previa between 2017 and 2024 at our tertiary hospital were reviewed. Primary outcome of the study is to evaluate feasibility of uterine isthmic tourniquet left in situ for uterine preserving by preventing postpartum hemorrhage for patients with placenta previa-accreta. As a secondary outcome, group 1 (n=28) patients who were managed with uterine isthmic tourniquet left in place were compared with patients in group 2 (n=32) who were managed with only bilateral uterine artery ligation.

Results

This new approach uterine isthmic tourniquet technique prevented postpartum hemorrhage with a rate of 100 percent in group 1 patients, while uterine artery ligation prevented postpartum hemorrhage with a rate of 75 % in group 2. Postoperative additional interventions (relaparotomy hysterectomy, balloon tamponade application, uterine or vaginal packing) were performed for eight patients in group 2 (25 %) but not in group 1 (0 %) (p=0.015). The haemoglobin levels before caesarean section were similar in both groups (p=0.235), while the postoperative haemoglobin levels were lower in group 2 (9.69 ± 1.37 vs. 8.15 ± 1.32) (p=0.004). Erythrocyte suspension was given to two patients in group 1 and 12 patients in group 2 (2/28 7 % vs. 12/32 37 %, p=0.018).

Conclusions

The uterine isthmic tourniquet left in situ technique is a safe, simple and effective for preventing postpartum hemorrhage and preserving uterus during placenta previa accreta surgery as superior to uterine artery ligation alone.
Season and History
Authors: Kelin LI
Published: August 2024

Landscape painting flourished in the late Tang dynasty and reached its peak during the Song dynasty. It means that the artistry of landscapes no longer serves as decoration for portraits, nor is it merely a backdrop for unfolding stories. Instead, it is a simple pursuit of the aesthetic pleasure derived from landscapes themselves. In this pursuit, the landscape painting of the Song dynasty had a profound impact on the subsequent development of landscape art, both in terms of form and the spiritual content expressed. It is not an exaggeration to say that Song dynasty landscape painting laid the foundation for the tradition of literati landscape painting. Guo Xi, a master of landscape painting and a painter-theorist in the mid-Northern Song period, actively explored his artistic practice. He also reflected on and summarized his methods. From the overall conception of the meaning of landscapes to the self-pursuit of brushwork style, Guo Xi endeavored to narrow the gap between abstract ideas and concrete execution. His efforts resonated with the Daoist philosophy of Neo-Confucianism in the Northern Song, transcending the dimensions of transcendental “essence” and personal “effort” to establish a connected path of nature, body, and destiny. From a different perspective, this also represents the interplay of cosmology and ontology through generative time.
Stepping-out-of-Oneself: An Intercultural Dialogue on the Power of Things
Authors: Wang Zhuofei
Published: August 2024

The concept stepping-out-of-oneself concerns a process by which things manifest themselves and make themselves present. This process does not depend on subjective influence but on the power of the thing itself. In this respect, the value of the thing itself and its impact on the sensory experience are brought to the foreground. From an aesthetic point of view, this concept corresponds to a new orientation of contemporary aesthetics of nature, which reflects the programmatic weakening of the subject-centered approach, the estrangement from the substance ontology as well as the phenomenological interest in the power of things.

In this article, I attempt to argue that traditional Daoist thought can also provide a point of contact for the exploration of stepping-out-of-oneself. The focus on my study is on two issues: 1. under what circumstances is stepping-out-of-oneself possible? 2. how is it possible to perceive stepping-out-of-oneself?
Cholo, Cholear, Choleando…
Authors: Tolmos Leandro , Andrade Marisa de , Hannes Karin
Published: August 2024

In this essay we explore the openings that assemblage/ethnography brings for understanding the complexities of and beyond epistemic injustice. Through remembering the gesture of a grandmother and her migration from the Northern Andes of Peru to the capital city of Lima, we work with the Peruvianism “cholo, cholear, choleando” to illustrate how epistemic injustice infiltrates everyday life. Attempting to sit in between the personal and the cultural, the singular and the historical, the past-present-future, and multiple geographical locations, this essay seeks to move in-between these intertwined and simultaneous occurrences. We resist an ultimate definition for epistemic injustice and instead encourage relating intimately with its contradictory unresolved and always-in-process nature.
Cuidado transicional da pessoa idosa após Acidente Vascular Cerebral: revisão de escopo
Authors: Coêlho Wender Gonçalves , Matiello Fernanda de Brito , Bento Dieyeni Yuki Kobayasi , Mendes Karina Dal Sasso , Fernandes Daiane de Souza , Braga Pollyanna Guimaraes , Rodrigues Rosalina Aparecida Partezani
Published: August 2024

Objetivo: mapear a transição do cuidado da pessoa idosa após acidente vascular cerebral do hospital para o domicílio.  Métodos: revisão de escopo, segundo a metodologia JBI. A busca foi conduzida em oito bases de dados, uma biblioteca eletrônica, além de fontes de literatura cinzenta. O Endnote e o Rayyan foram as ferramentas utilizadas para a seleção dos estudos, seguindo as diretrizes do PRISMA-ScR. A seleção dos estudos envolveu dois revisores, com um terceiro para análise final. Resultados: de 1.378 estudos, 30 foram selecionados para leitura na íntegra, resultando em 12 artigos publicados entre 2013 e 2023, sendo três qualitativos, oito quantitativos e um estudo misto. Além disso, da literatura cinzenta foram resgatados dois capítulos de livros para compor a amostra, totalizando 14 estudos abordando o tema. Conclusão: destaca-se que as propostas de plano necessitam abranger condições gerais da pessoa idosa no processo de transição, porém deve-se atentar para o contexto ambiental em que a pessoa vive e a disponibilização de recursos. Contribuições para a prática: as evidências descritas podem auxiliar a construção de medidas mais efetivas para o aprimoramento da assistência prestada a esse indivíduo que necessita transicionar seus cuidados do hospital para o domicílio.
SPATIAL JUSTICE: GEOGRAPHICAL CONCEPTUALIZATION IN THE CONTEXT OF WAR IN UKRAINE
Authors: Gukalova I. V. ,   Institute of Geography of the National Academy of Sciences of Ukraine, Kyiv, Maruniak Eu. O. , Lisovskyi S. A. , Mozghovyi A. A. , Poklyatskyi S. A. , Gormiz O. V. ,   Institute of Geography of the National Academy of Sciences of Ukraine, Kyiv,   Institute of Geography of the National Academy of Sciences of Ukraine, Kyiv,   Institute of Geography of the National Academy of Sciences of Ukraine, Kyiv,   Institute of Geography of the National Academy of Sciences of Ukraine, Kyiv,   Institute of Geography of the National Academy of Sciences of Ukraine, Kyiv
Published: August 2024

As a scientific category, spatial justice requires to be detailed and in-depth theoretical and methodological study, as well as empirical evaluation. Since representatives of different fields of knowledge offer their own definitions of spatial justice, it is impossible to have a systematic view of it, nor to place accents that are important for geo­graphers. The purpose of the study is to analyze and summarize approaches to the definition of “spatial justice”, to outline its main dimensions, and to clarify, through an online expert survey of geographers, the essence of the category and the focus of its study in the context of the military situation in Ukraine. The analysis of the literature and the results of an online survey of geographers on the nature of spatial justice in Ukraine revealed that justice is based on the principle of equal opportunities, which is worth striving for, given the objective geographical inequalities in living conditions, access to services, levels of mobility, etc. Even though the category of “spatial justice” has been defined by geographers in the past, it is not yet clear what the main dimensions of spatial justice are, and what the focus of its study should be. Although the category of spatial justice is most developed in Western countries, its implementation in war and post-war conditions in Ukraine is extremely necessary, especially since the injustice of war is exacerbated by its consequences. According to the majority of respondents, spatial justice can be interpreted as the achievement of a state in which the economic life of a given territory is subordinated to, or at least does not contradict, the interests of the local community, creating benefits and opportunities to meet production, cultural and other needs. In times of war, it is also a fair democratic process of sharing benefits and risks between territories. The definitions chosen by the majority of respondents can be the basis for the further development of theoretical, methodological, and practical tools for the formation of a platform for the implementation of the principles of spatial justice at different territorial levels.
TERRITORIAL IDENTITY OF THE POPULATION OF UKRAINE: ESSENCE AND THE MAIN FACTORS OF FORMATION
Authors: Borysenko V. K. ,   M. Rylskyi Institute of Art Studies, Folkloristics and Ethnology of the National Academy of Sciences of Ukraine, Kyiv
Published: August 2024

The main factors in forming the local forms of national identity and the influence of socio-cultural circumstances and such important features as common territory, nature, culture, space, group, kin, self-identity, religious affiliation, family, worldview, symbols, etc., are revealed. Various types of identity, the main factors of their formation, and the change of mental characteristics under the influence of the war disaster are analyzed. It shows how important worldview and cultural factors are in developing national identity, the negative impact of forced assimilation of the population, and manifestations of resistance to aggression and wrongdoing, which leads to the activation and change of national identity.
MONITORING OF BOUNDARIES OF IMMOVABLE OBJECTS OF HISTORICAL AND CULTURAL HERITAGE BY CARTOMETRIC METHOD
Authors: Chetverikov B. V. ,   Lviv Polytechnic National University, Lviv, Trevoho I. S. ,   Lviv Polytechnic National University, Lviv
Published: August 2024

Today, the most effective methods of studying polygonal objects of historical and cultural heritage are cartometric and remote (mainly based on the processing of remote sensing data). If necessary, also use archeology, but only after using the specified methods. This work presents the application of the cartometric method using GIS technologies on the example of determining the boundaries of Jewish cemeteries in the village of Gornostaypil, Kyiv region, which is located on the border of the Chernobyl thirty-kilometer exclusion zone, and in the village of Olyka, Volyn region. Today, the territory of the cemeteries is not used for burials, and in the Soviet period, in the village of Gornostaypil, it was built up with administrative and economic buildings, in the village of Olyka, partly by the private sector. Both archival and modern cartographic products and remote sensing data served as input data. Thus, all cartographic products are small-scale, due to the display of objects and the generalization of the border and area of cemeteries, they are displayed distorted, so their use is conditioned by the study of the dynamics of the elevation of cemeteries. To display the historical boundaries of objects in the modern urban planning picture, plans of cemeteries on a scale of 1:500 were created using geodetic methods using GNSS surveying.
Online food delivery services and unceasing behavioural intention: An assessment for integrating expectation-confirmation and technology acceptance models
Authors: Mussina Kamshat , Podsukhina Olga , Omarova Kenzhegul , Rustemova Sabira , Shaimova Aigerim , Tleuberdiyeva Saltanat
Published: August 2024

The coronavirus disease (COVID-19) quarantine restrictions led to significant changes in the food industry's delivery methods, with a notable rise in online food delivery services (OFDS). This increase necessitates a deeper understanding of the factors influencing the continued use of these services. This study investigates the relationships between perceived ease of use, perceived usefulness, satisfaction, confidence, trust, and continuous intention to use OFDS applications among young consumers in Kazakhstan. An integrated model based on expectation-confirmation and technology acceptance models, incorporating the habit of online shopping as a moderator, was used. Data was collected from 433 respondents with prior OFDS experience and analyzed using Smart PLS 4.0. The results show positive correlations between perceived ease of use, perceived usefulness, satisfaction, confidence, trust, and the continuous intention to use OFDS among young Kazakhstani consumers. Additionally, the study confirms the moderating role of online shopping habits in the relationship between satisfaction and trust and the continuous intention to use OFDS. These findings offer valuable insights for companies in the online food delivery sector, highlighting key factors that can enhance managerial and IT strategies to boost revenues and foster sustained use of OFDS applications.
Behavioral insights in education: Intellectual data analysis for management
Authors: Usyk Vira , Radionova Irina , Fareniuk Yana
Published: August 2024

This research utilizes intellectual data analysis to deepen insights into educational dynamics by examining university professors' behavioral responses to education management amidst socioeconomic uncertainty. The study applied sophisticated regression and cluster analysis tools to sociological survey data, focusing on professors' attitudes toward distance education. The survey assessed perceptions of its advantages and disadvantages, aiming to uncover factors influencing professors' inclinations toward this mode of teaching. Results revealed six distinct behavioral "profiles" or clusters of professors, each with unique responses to distance education. These insights guide recommendations for educational policy priorities aimed at addressing weaknesses in education management. Key strategies proposed include forming databases of behavioral responses and employing algorithms for deep intellectual analysis. Such measures intend to align educational practices with the values, welfare needs, and communication preferences of the scholarly community, thereby enhancing their propensity for distance education. The study concludes that a higher level of academic engagement in distance education can be achieved by tailoring educational strategies to the specific needs and values of different professor groups. This approach promises to improve the effectiveness of education management and the overall quality of education, benefiting both professors and students by creating a more supportive and effective teaching environment.
Latvian municipal budget expenditures on transport infrastructure and production in the context of improving the local economy
Authors: Komarova Vera , Ignatjeva Svetlana , Kudins Janis , Kokarevica Anita , Ostrovska Inta , Čižo Edmunds
Published: August 2024

The article aims to study Latvian municipal budget expenditures on transport infrastructure and production in the context of improving the local economy. The authors hypothesize that the comparative priority of municipal budget expenditures on two items is determined by the state of the local economy; in municipalities with a more developed economy it is ‘transport’ rather than ‘production’ budget expenses that are more likely to improve the local economy, and in municipalities with a less developed economy – vice versa. The authors tested the hypothesis based on data for 2021 and 2022 (the time after the reform of the territorial-administrative structure of Latvia) for 43 Latvian municipalities using various methods of statistical analysis. The results show that the comparative priorities in Latvian municipal budget expenditures are determined not by the state of the local economy, but rather by the geographical (or geopolitical/geoeconomical) location of the municipality. As a result of this, Latvian municipalities are grouped into territorial clusters, using the agglomeration effect from the concentration of transport infrastructure or production. Over the past year, there has been a tendency towards ‘transport-production’ economic restructuring of the territory of Latvia, the reasons for which may be geopolitical situation in the Eastern Europe.
Impact of self-efficacy and mediating factors on Fintech adoption in the VUCA era
Authors: Thi Chinh Nguyen , The Anh Khuc , Nguyen Duc Duong , Phuong Kim Quoc Cuong , Linh Le Dieu
Published: August 2024

This paper aims to understand the impact of factors affecting the relationship between intention and using Fintech in the VUCA era, which stands for volatility, uncertainty, complexity, and ambiguity. A cross-sectional design was employed in this study. The data was collected via questionnaires, with 1,411 usable responses received through the survey. Partial least squares structural equation modeling (PLS-SEM) was employed to assess the process with SmartPLS 4. Our research did figure out the positive impact of Perceived Usefulness and Perceived Ease of use on behavioral intention and the positive impact of Intention on Using Fintech behavior. Simultaneously, we indicated that Financial literacy could moderate the relationship between Intention and Using Fintech behavior, and Financial self-efficacy would be a mediator of the association between Financial literacy and Using Fintech behavior. Based on the results, we make some recommendations for Fintech developers in Vietnam.
Resistance to Torsion of Cement vs Screw-Retained Abutments Under a Tangential Load: A Pilot Study
Authors: Navarrete Vanessa , Angeles Ruben , Vernal Rolando , Valdivia Erick , Vergara-Buenaventura Andrea , Muniz Francisco Wilker Mustafa Gomes , Cafferata Emilio A.
Published: August 2024

The aim is to compare the resistance to torsion between 2 implant systems with internal hexagon connection: one using screw-retained abutments (Titanium Fix) and the other using cementable abutments (ITEC) under a tangential load. An in vitro experimental study was carried out. Fourteen implants, 7 implants from each system, were included in this study. The implants were placed at a 45° angle into metal blocks to simulate their position in the maxilla. Then, implants were subjected to a resistance test on a CMT5L universal testing machine, and the maximum load was applied to each sample. The maximum force with which the torsion was achieved in each sample was analyzed. The data were tested using the Shapiro-Wilk test and showed normal distribution. Student t test was used to examine statistical significance between the two groups, and the P value was set at P < .05. There was a statistically significant difference between the two groups (P = .001). ITEC implants with a cementable abutment showed greater flexural strength compared to the Titanium Fix with a screwed abutment implant system. The cemented abutment showed more resistance to torsion against a tangential load compared with the screwed abutment.
An Analysis of Scientific Research Trends in Oral Implantology Between 2016 and 2022
Authors: Kadkhodazadeh Mahdi , Haririan Hady , Amid Reza , Rezaei Fatemeh , Yazdani Atoosa , Akbarzadeh Baghban Alireza , Azadi Ali
Published: August 2024

The present study aims to evaluate the trends of oral implant–related research in design and topics between the range of 2016 to the end of 2022. The electronic search was conducted in MEDLINE via Pubmed. Papers published in Clinical Oral Implant Research, Clinical Implant Dentistry and Related Research, and International Journal of Oral Implantology as well as previously European Journal of Oral Implantology, International Journal of Oral and Maxillofacial Implants, and Journal of Oral Implantology between January 1, 2016, and December 30, 2022, were retrieved. Articles were classified according to their study design and major subjects. The Joinpoint regression model was used to determine changes in the trends of study designs and topics. Statistical significance was defined as a p-value <.05. A total of 3382 articles were analyzed in this study. In the specified period, in vivo, prospective cohort, retrospective case control, randomized clinical studies in the design and prosthetic complications, peri-implant hard tissue studies in the topic experienced a significant decreasing pattern in the number of published articles as well as the total number of articles. Case reports and series, retrospective cohort, nonrandomized clinical studies in the design and outcomes of implant-related treatment plans, immediate implant placement, and peri-implantitis in the topic experienced a significant decreasing pattern followed by a significant increasing pattern with a turning point between 2017 and 2020. Considering the limitations of this scientific topical trend analysis, it can be concluded that the recent pandemic affected the research path in oral implantology in many ways.
Trueness of Intraoral Scanners in Different Scan Patterns for Full-Arch Digital Implant Impressions
Authors: Sezer Taygun , Esim Emir , Yılmaz Erkan
Published: August 2024

The optimal scan pattern for full-arch digital implant impressions remains to be determined. This study aimed to analyze the effects of different scan patterns on the trueness of intraoral scanners for full-arch digital implant impressions. A maxillary plaster model with 4 implant analogs was employed as the master model. Scan bodies were attached to the master model and scanned with a laboratory scanner to obtain reference data. Test scans were obtained using 3 different scan patterns with Cerec Primescan and Trios 3. Each test datum was superimposed onto the reference data. The trueness was assessed by determining the 3D distance and angular deviations between the test and reference data. Significant differences in 3D distance deviation were detected among the scan patterns for both scanners. Significant differences in angle deviation were detected among the scan patterns for the Cerec Primescan, whereas it was not substantial for the Trios 3. Cerec Primescan exhibited superior trueness across all scan patterns compared with Trios 3. The zigzag pattern resulted in more accurate scans for the Cerec Primescan, whereas both the zigzag and occlusal-palatal-buccal patterns showed higher accuracy for the Trios 3.
Oral Carcinoma Arising Under Implant-Supported Prosthesis: Progression of Proliferative Verrucous Leukoplakia Initially Mimicking Lichen Planus
Authors: Silva Paula Verona Ragusa , Palaçon Mariana Paravani , Silveira Heitor Albergoni , Martins Karina Helen , Bufalino Andreia , León Jorge Esquiche
Published: August 2024

Proliferative verrucous leukoplakia (PVL) is a non-homogenous type of oral leukoplakia, characterized by multifocal white plaques, propensity to recur after treatment, with strong tendency towards malignant transformation. Interestingly, some studies show that, at initial stages, PVL may resemble oral lichen planus (OLP), potentially leading to misdiagnosis. A 52-year-old woman, with a previous OLP diagnosis, was referred to our service for implant installation and follow-up of OLP lesions. After clinicopathological re-evaluation, a diagnosis of PVL (early stage) was made, and a maxillary full-arch implant-supported prosthesis supported by implants was installed. After 6 years of follow-up, the patient developed squamous cell carcinoma around the implants. The current case emphasizes that PVL patients with oral lesions suggesting peri-implantitis or peri-implant mucositis deserve a more meticulous investigation.
EXTREMES OF VECTOR-VALUED PROCESSES BY FINITE DIMENSIONAL MODELS
Authors: Xu Hui , Grigoriu Mircea D.
Published: August 2024

Finite dimensional (FD) models, i.e., deterministic functions of time/space and finite sets of random variables, are constructed for target vector-valued random processes/fields. They are required to have two properties. First, standard Monte Carlo algorithms can be used to generate their samples, referred to as FD samples. Second, under some conditions specified by several theorems, FD samples can be used to estimate distributions of extremes and other functionals of target random functions. Numerical illustrations involving two-dimensional random processes and apparent properties of random microstructures are presented to illustrate the implementation of FD models for these stochastic problems and show that they are accurate if the conditions of our theorems are satisfied.
CONVECTIVE FLOW AND HEAT TRANSPORT OF CLAY NANOFLUID ACROSS A VERTICAL SURFACE IN A DARCY-BRINKMAN POROUS MEDIUM
Authors: Khan Umair , Zaib Aurang , Ishak Anuar , Sherif El-Sayed M. , Pop Ioan
Published: August 2024

Drilling fluids are important in the extraction of oils and gases through rocks and soil. Clay nanoparticles are essential for enhancing drilling fluid efficiency. The thermal conductivity, viscosity, and boiling point of drilling fluids increase when clay nanoparticles are incorporated, providing resistance to high temperatures and regulating fluid costs. This article illustrates the convection heat transfer in drilling nanofluid while taking into account the significant presence of clay nanoparticles in the fluid used for drilling. The efficient thermophysical characteristics of clay nanofluid are expressed mathematically using Maxwell-Garnett and Brinkman's formulas. The linear PDEs with physical boundary conditions that control the flow phenomena are predetermined. The similarity technique is employed to transmute these PDEs into ODEs and then an efficient bvp4c solver is utilized to find dual solutions. The Nusselt number and skin friction are calculated and displayed in tabular form as well as graphical form along with the velocity and temperature profiles. Multiple solutions are observed in the case of shrinkable sheets as well as in the case of buoyancy assisting flow. The findings demonstrate that when volume concentration increases, the Nusselt number rises noticeably. In addition, the permeability parameter expands the boundary layer thickness in the lower solution, while the contrary behavior is observed in the upper solution.
Effects of spinal-epidural anesthesia combined with intravenous etomidate on adrenocortical and immune stress in elderly patients undergoing anorectal surgery: A retrospective analysis
Authors: Li Yangyi , Wu Jiangyan , Chen Chengbo , Su Changsheng
Published: August 2024

The management of anesthesia in elderly patients undergoing surgery presents unique challenges, particularly in mitigating stress responses and ensuring stability. Etomidate may alleviate adrenocortical and immune stress. This study aims to investigate the anesthetic effects of combined spinal-epidural anesthesia (CSEA) supplemented with etomidate during anorectal surgery in elderly patients. The medical records of 49 cases treated with CSEA and etomidate (ETO group) and 48 cases treated with CSEA alone (control group) were reviewed and analyzed. All patients received ropivacaine hydrochloride for anesthesia, with the ETO group additionally receiving an infusion of etomidate for sedation. Parameters such as arterial blood gas, visual analog scale (VAS), Ramsay sedation scale (RSS), serum cortisol and norepinephrine levels, pro-inflammatory cytokines, and lymphocyte ratios were assessed at different time points. Compared to the control group, the ETO group showed increased mean arterial pressure, decreased heart rate, and elevated arterial SpO2 30 minutes after anesthesia. The ETO group also had higher RSS scores, lower VAS scores, and reduced serum cortisol and norepinephrine levels. Additionally, decreased levels of pro-inflammatory cytokines, such as interleukin (IL)-6, tumor necrosis factor (TNF)-α, and IL-8, were observed, along with an increase in the regulatory cytokine IL-10. An increased proportion of CD4+ T cells and a higher CD4/CD8 ratio were also noted. This study demonstrates the benefits of using etomidate to mitigate adrenocortical and immune stress in elderly patients undergoing anorectal surgery.
Protocol SAM-Seq Zea Mays v3
Authors: leduque basile.leduque , Quadrana Leandro s
Published: August 2024

Background: Epigenetic modifications, including chromatin accessibility, nucleosome positioning, and DNA methylation (5mC), are pivotal in shaping genome function. However, current short read sequencing approaches present challenges in characterising epigenetic patterns along repetitive genomic regions. Results: We developed Simultaneous Accessibility and DNA Methylation Sequencing (SAM-seq), a robust method utilising bacterial adenine methyltransferases (m6A-MTases) to mark accessible regions in purified plant nuclei. Coupled with Oxford Nanopore Technology sequencing, SAM-seq enables high-resolution profiling of cytosine methylation and m6A-tagged chromatin accessibility along individual chromatin fibres in A. thaliana and maize. Importantly, using naked genomic DNA we uncovered significant sequence preferences of m6A-MTases, which we show must be taken into account in order to obtain reliable accessibility profiles, particularly for the analysis of highly repetitive sequences such as centromeric repeats. Using this method we found intriguing antagonism between accessibility and DNA methylation within single molecules, somatic epigenetic variation at bivalent chromatin domains, periodicity of nucleosomal strings over centromeric repeats, and high-resolution methylation profiles over nucleosomes. Conclusions: Our study highlights the importance of considering intrinsic substrate preferences of DNA modifying enzymes for their use in chromatin profiling. Hence, SAM-seq is a robust and cross-species method to chart high-resolution accessibility and DNA methylation genome-wide. This method and findings will enable the investigation of chromatin-based regulation across plant species, with implications for the study of non-model plant species with limited genomic and epigenomic information.