bluuebunny/crossref_metadata_2025 huggingface dataset:
Calculation of the wave field in a layered soil foundation using the grid method
Authors: Sizov Dmitrii , Egereva Elvira
Published: April 2024

The article contains a solution to the problem of propagation of waves in a soil massif arising from the movement of subway trains. This problem often arises when predicting vibration levels in buildings located near metro lines. The problem is considered in a two-dimensional formulation, taking into account the actual location of soil layers with different physical and mechanical properties. The soil is modeled using the assumption of its linear deformability, which, to a first approximation, is acceptable due to small vibration displacements. To solve the problem, the finite difference method is used, which allows taking into account the various physical properties of individual soil layers and the structure of subway tunnels and at the same time is one of the simplest numerical methods. To obtain a solution, the direct integration method is used using an explicit scheme, which requires setting sufficiently small time steps. The results are presented as graphs of vibration displacements obtained at various points in time. The graphs illustrate the different nature of the wave field at different load frequencies. The dynamic load is specified in the form of vibrations of the walls of the subway tunnel.
Dynamics of carbon framework of coal tar pitch with carbon additives in the thermolysis process
Authors: Popova Anna , Sozinov Sergey , Ismagilov Zinfer
Published: April 2024

This paper studies the transformation of the carbon framework of coal tar pitch in the process of thermolysis in the presence of carbon additives of different structures. It is established that as a result of the application of all investigated carbon additives, the content of volatile products released as a result of the thermolysis of the ash, including carcinogenic compounds, decreases, which contributes to the increase of the coke residue yield. The highest yield of coke residue was found when using nanostructured carbon materials as an additive, but the structure of the resulting carbon material is more disordered than in the case of individual pitch. It is shown that the use of such additives promotes the formation of graphite-like structures in the process of thermolysis of pitch and to a greater extent than amorphous carbon additives, reduces the amount of carcinogenic volatile products of coal tar pitch thermolysis.
Study of the influence of corona discharge on the efficiency of oxidation of organic impurities using ozone
Authors: Soloveva Olga , Solovev Sergei , Voropai Lyudmila , Kuznetsova Olga , Sinitsyn Anton , Marsov Nikolay , Rodygin Dmitry
Published: April 2024

Purification of air containing volatile organic compounds is an important task in many industries. This article examines the effect of corona discharge on the efficiency of the oxidation of organic mixtures. As a result of our research, we found that the consumption of ozone for the oxidation of various components of the mixture is approximately the same. This means that other particles, including water vapor, also take part in oxidation reactions.
Energy saving potato-digger machines
Authors: Norchaev Davron , Yakubov Khushnud , Radjabov Rashid , Kurbonov Umirbek
Published: April 2024

The article presents the results of theoretical and experimental research on the substantiation of the parameters of the working bodies of energy-saving potato diggers for irrigated lands in Uzbekistan. The developed design diagrams of energy-saving potato diggers and diagrams of their technological process with an indication of the main parameters are described. The rational parameters of the digging machines, which ensure the minimum energy consumption when digging potatoes, have been determined. The parameters of the supporting-clod-breaking device were optimized. The rational parameters of the ripper and the swathe were found. Comparative tests indicated an increase in the degree of soil separation in the summer and autumn periods, respectively, by 19.2-23.6% and 17.9-19.8%, an increase in the completeness of potato harvesting by 6.5-10.0% and 7.1- 8.9%, a decrease in the degree of damage to tubers by 8.4- 11.1% and 4.7-5.3%, an increase in the productivity of the unit by 25.0%, a decrease in labor costs by 60.0%, and operating costs for 31.5% when using an experimental potato-digger machine with the recommended parameters of the equip. The use of the recommended walk-behind tractor with an improved technology potato-digger reduces damage to tubers by 5-6%, increases productivity by 20%, reduces labor costs by 50%, and operating costs by 19%.
Development of methods for calculating thermal conductivity of gas condensates-alternative motor fuels
Authors: Makhmudov Galib
Published: April 2024

The article is devoted to the development of methods for calculating the thermal conductivity of complex hydrocarbon mixtures such as gas condensates, which are widely used as components for motor and jet fuels. The work was carried out on the basis of the results of experimental studies of thermal conductivity of the eight most representative deposits in Central Asia in terms of group hydrocarbon composition. An analysis of existing equations for calculating the thermal conductivity of liquid petroleum products and the possibility of their use for gas condensates was carried out. A number of new equations are presented for calculating the thermal conductivity of gas condensates depending on the group hydrocarbon composition in a wide range of temperatures and pressures.
Overdue waiting of wagons on railway branch tracks: problems and solutions
Authors: Kobulov Jamshid , Shermatov Elbek , Saidivaliev Shukhrat , Sattorov Samandar , Barotov Jamshid
Published: April 2024

The purpose of the study: to prevent wagons from being waited aimlessly by freight owners (Railway customers) on the branch roads of freight cars in rail transport, and to improve wagon turnover indicators Method of study: on the basis of statistical data, comparisons were made on the example of regional railway nodes of the railway in the case of the fact that cars remain standing due to the fault of Railway customers on Branch roads for more than a specified period. The history of the occurrence of the coefficient of the amount of the current fine was studied. it was studied to what extent the statement of the indicators of the amount of fines on the main myory cells was correctly interpreted on the secondary myory cells, and analyzed by comparing the definition of fines for leaving wagons waiting for myory abroad. The main result from the research. The amount of the fine levied for the time of waiting for railway-owned wagons without a goal is obtained as a result of increasing their effectiveness in relation to Railway customers, the wagons on the branch roads received a traffic jam. The number of re-releases of wagons decreases, Efficient use of shunting locomotives and freight fronting over-unloading machines. The station leads to a mutadillation of the operating mode, in a word, by increasing the turnover of wagons, an improvement in the indicators of the effective use of wagons is achieved.
Simulation model for predicting ecological condition of urban areas at traffic intersections
Authors: Krasnikov Aleksandr , Korotun Olga
Published: April 2024

This article substantiates the relevance of the development and use of digital tools that allow modeling objects and processes of transport systems to determine the environmental consequences of changes in their quantities and states. The use of methods of structural analysis, systematization, observation, statistical analysis of data allowed to establish all key objects of the system and their qualitative and quantitative indicators necessary to create a digital twin. The use of simulation modeling methods allowed to formalize the obtained results into models involved in the digital twin of the transport system. Using the graphical method, state diagrams were developed to demonstrate the transition of states of each object of the process depending on changes in environmental conditions. On the basis of the statistical analysis of pollutant emissions in the study area, a parametric model was developed for each pollutant factor.
Development of mining operations in deep quarries using automobile and combined transport
Authors: Komilov S. , Rustamov K.J. , Akramova L. , Egamshukurov P. , Tastanova G.
Published: April 2024

Aim of this paper is to explore the development of mining operations in deep quarries utilizing automobile and combined transport systems to overcome these challenges. The use of automobiles in mining has been a growing trend, offering flexibility, maneuverability, and increased productivity. In deep quarries, traditional automobile transport faces limitations in terms of reach and efficiency, combined transport systems incorporating a combination of automobiles, conveyor belts, and other transport mechanisms have been proposed. This paper discusses the advantages of automobile transport in deep quarries, including its ability to navigate narrow passages and transport smaller loads efficiently. It examines the integration of combined transport systems, which leverage the strengths of automobiles alongside other modes of transportation to optimize mining operations. Key considerations in the development of these systems include infrastructure design, vehicle specifications, safety protocols, and environmental impact. By implementing innovative solutions tailored to the specific challenges of deep quarry mining, such as automated vehicle control and monitoring systems, it is possible to enhance efficiency, reduce operational costs, and improve safety standards. Also, this paper highlights case studies and examples of successful implementations of automobile and combined transport systems in deep quarries around the world. These real-world examples demonstrate the feasibility and benefits of adopting such approaches in challenging mining environments. In the paper criteria requirements and recommendations for the implementation of this process are presented in the technological processes of compaction using separators, which are carried out during the construction of highways, and the interdependence of indicators is presented through tables, graphs and calculation expressions.
Electric charging stations for electric vehicles in a traffic flow simulation model
Authors: Krasnikova Irina , Beresneva Yana
Published: April 2024

This article substantiates the need to use simulation modeling in planning the location of parking lots equipped with charging stations for electric cars. Moscow is actively developing infrastructure for the use of electric cars for personal use, but there is a limited number of charging stations in the city districts. This increases the load on the transportation framework of the capital. Creating a simulation model of the transport system allows us to identify its “bottlenecks” related to the effective organization of road traffic and the creation of a sustainable environment. The use of methods of structural analysis, synthesis, groupings, information and simulation modeling allowed to establish all key objects of the problem area, their qualitative and quantitative characteristics necessary to create a simulation model. The created simulation model is based on the developed formal models of changes in the states of each class of objects, corresponding to the behavior in the real urban environment. To demonstrate the obtained results, a three-dimensional model corresponding to the simulation model is developed.
Study of the uplift of buried pipelines in liquefied soils based on the earthquake record
Authors: Mardonov Batir , Mirzaev Ibrakhim , Nishonov Nematilla , An Ekaterina , Kosimov Elbek
Published: April 2024

The uplift of a straight buried pipeline with a middle part located in liquefied soil was considered in the article. The process of uplift of the pipeline under the action of Archimedes’ force in the liquefied soil zone and longitudinal compressive force arising due to the temperature difference of the transported product and its internal pressure and also based on the Gazli earthquake record are investigated. To solve the problem the finite element method is used with the incremental refinement of the solution by the method of successive approximations. In the deformation process takes into account the separation of the pipeline from the base and the decrease of soil pressure along the length of the pipeline during the uplift process, taking into account the increment of displacement from the previous step. The results of solving the problem are presented in the form of graphs and their analysis for specific numerical parameters of the pipeline and its interaction with the surrounding soil.
A mathematical model for reliability management of agricultural machinery
Authors: Tsarkova Evgenia
Published: April 2024

The article examines the current and practically significant task of managing the reliability of agricultural machinery used in the production activities of Russian Federation penal system institutions. A model for optimal management of technical maintenance and repairs of technical equipment is proposed in order to increase their reliability. Additionally, the necessary optimality conditions for solving the optimization problem under consideration are formulated. An algorithm for the numerical solution of the formulated optimal control problem has been developed, and the results of testing the implemented algorithm are presented. The implementation of the proposed approach in the form of an automated decision support system serves to solve the problem of increasing the operational reliability of vehicles used in agricultural activities of correctional institutions.
Information and diagnostic tools for monitoring units of agricultural machinery
Authors: Kostomakhin Mikhail , Sayapin Alexander , Pestryakov Efim , Petrishchev Nikolai , Tseiko Alexander , Kostomakhin Nikolay
Published: April 2024

The issues of assessing the increase in the efficiency of domestic agricultural machinery according to the criteria of suitability for maintenance and diagnostics and the development of measures to improve it are relevant, as they have a significant impact on the reliability and total cost of ownership and resource of saving during operation. It should be noted that not only the costs of maintenance and repair, but also the time spent in an inoperative state, technical readiness, productivity and other indicators of the efficiency of use for its intended purpose, including resource-saving impacts, depend on the level of equipment adaptability. The purpose of the research was to describe the state of the issue and justify the need to develop information and diagnostic tools for assessing the general technical condition of energy-intensive tractors. The analysis and description of the developed tools for diagnosing agricultural machinery have been done in the work. Similar control and diagnostic equipment produced by third-party manufacturers for agricultural machinery was considered. The distinctive features of our own developments were determined and the need to diagnose specific parameters was also reflected. As a result of the work 3D modeling of the device data was carried out. Then they were designed in special software and the first prototypes were assembled. The tests have proven the possibility of developing such digital diagnostic of device. The data obtained on the base of their effectiveness was reflected and justified. A number of improvements to these systems have been proposed. The results of the operation of all information and diagnostic devices were summed up. Further development of this area of work has been proposed for more modern and high-quality maintenance of units and assemblies of agricultural machinery.
Techno-economic assessment for metallurgical coals: a ‘value-in-use’ approach
Authors: Sharma Naresh , Tiwari Hari Prakash
Published: April 2024

The optimization of coke cost is the most significant cost-controlling factor for hot metal production. Therefore, worldwide cokemakers always have extra pressure from management to produce superior quality coke with inferior raw materials and optimal costs. Coke quality is crucial in blast furnace operation regarding cost and productivity. The quality of coke is significantly influenced by the quality of different categories, viz., prime hard coking coal, hard coking coal, soft coking coal and semi-soft coking coal of individual coals used in the coal blend. The impacts of these coals directly influence coke properties because all coals have an inherent characteristic with different coking potentials in terms of value-in-use (VIU). Also, the technological and techno-commercial change of the metallurgical coal market of today differs from past decades. Likewise, the future metallurgical coal market will vary from today’s market. Therefore, a process for assessing/evaluating the coking potential of metallurgical coal shall be used for appropriate value-in-use to produce quality coke with the optimum cost. The composite coking potential methodology served the value-in-use purpose and was successfully implemented. The paper describes the significance of the value-in-use of metallurgical coal to evaluate the most economically favourable technique for producing the desired coke quality.
Application of 3D recognition algorithm based on spatio-temporal graph convolutional network in basketball pose estimation
Authors: Ye Mingzhi
Published: April 2024

In recent years, human motion recognition in computer vision has become a hot research direction in this field. Based on 2D human motion recognition technology, real-time extraction of motion features from 2D planes is used to recognize human movements. This method can only learn the position contour and color information of the image. It cannot directly reflect the motion situation, which results in low recognition accuracy and efficiency. In response to this issue, this study proposes a combination method of motion recognition and 3D pose estimation to recognize and classify basketball movements. First, the 2D skeleton model is obtained by extracting the feature information in the video action, which is converted into a 3D model, and the model is replaced by the time-space convolutional network to establish a human action recognition model. The experiment showed that when the number of iterations reached 6, the accuracy of the spatio-temporal graph convolutional network algorithm model reached 92%. Comparing the accuracy rates of different algorithm models, the average accuracy rates of convolutional neural network, long short memory network, graph convolution, long short model of action recognition and graph convolution model of action recognition were 61.6%, 65.4%, 72.5%, 76.8% and 90.3% respectively. The results show that the proposed 3D recognition algorithm can accurately recognize different basketball movements. This study can provide reference for basketball coaches and athletes in basketball training.
Enterprise intelligent manufacturing data analysis technology based on big data analysis
Authors: Wang Wenle , Li Qilong , Zhu Fuwen
Published: April 2024

The rise of big data has deeply influenced various industries, especially the intelligent manufacturing of enterprises. However, traditional data analysis methods are difficult to adapt to the storage and analysis of sea volume data in intelligent production. To address this issue, a method relying on big data analysis and cluster analysis is proposed to design data analysis techniques for enterprise intelligent manufacturing. The proposed improved algorithm is subjected to performance testing. The accuracy of this algorithm is 97%, which exceeds the comparison algorithm. The error is 6% and the running time is 5 s, both of which are below the comparison algorithm. The effectiveness of the enterprise intelligent manufacturing data analysis technology is tested. The experimental group completes orders in 4.1 weeks, 5.2 weeks, 3 weeks, 3.4 weeks, and 4.9 weeks, respectively, shorter than the control group. The product qualification rates for the experimental group are 92%, 93%, 95%, 92%, and 92%, respectively, which exceed the control group. In summary, the proposed enterprise intelligent manufacturing data analysis technology relying on big data and cluster analysis can better utilize data resources and information technology, improving the production efficiency and competitiveness of enterprises. It is hope that this research result can provide useful guidance and reference for the application and development of intelligent manufacturing data analysis technology in enterprises.
Une expérience d’éducation thérapeutique du patient à domicile dispensée par des professionnels libéraux
Authors: Debiossac Corinne
Published: April 2024

Nous présentons dans cet article une expérience originale d’éducation thérapeutique du patient dispensée à domicile par des professionnels libéraux. Les patients, âgés de 11 mois à 97 ans, qui auraient eu d’importantes difficultés à suivre un programme d’ETP à l’hôpital, présentent une grande diversité de maladies chroniques éligibles à l’ETP. Leur prise en charge d’ETP à domicile consiste en un diagnostic éducatif et trois séances (ateliers) d’éducation réalisée par une équipe pluridisciplinaire de professionnels, tous formés à la méthodologie de l’ETP et regroupés dans une association organisatrice de ce programme. Autorisé et financé par l’Agence Régionale de Santé (ARS) de Nouvelle Aquitaine, ce programme qui se déploie sur les départements de la Vienne et des Deux Sèvres a permis depuis fin 2019 à ce jour d’accompagner près de 380 malades. L’évaluation de cette expérience a démontré la satisfaction et le bénéfice qu’en retirent les patients et leurs aidants qui ont pu partager avec leur proche l’acquisition de compétences. Les professionnels libéraux ont pu élargir leur offre de soin, grâce à la rémunération de cette activité d’ETP à domicile. Ce modèle a de nombreuses implications, tant sur le plan de la pédagogie de l’ETP que sur celui de l’organisation et de l’accessibilité des parcours de soins.
Impact d’une éducation thérapeutique utilisant un groupe Facebook pour cadre sur les pratiques d’autosoins de femmes présentant un diabète gestationnel
Authors: Radhouen Gharbi , Lahmadi Angham , Laajili Olfa , Jemel Yasmine Mouelhi Menel , Kandara Hajer , Chiboub Marwa , Ben Mami Feika , Kammoun Ines
Published: April 2024

Introduction : Le diabète gestationnel (DG) est une affection fréquente. Sa prise en charge nécessite un niveau satisfaisant de pratiques d’autosoins. Celui-ci est insuffisamment assuré par la prise en charge conventionnelle. Objectifs : L’objectif de notre travail était d’évaluer l’impact de l’éducation thérapeutique basée sur un réseau social, Facebook, en complément de la prise en charge conventionnelle, sur le niveau des pratiques d’autosoins des femmes présentant un diabète gestationnel. Méthode : Nous avons mené une étude interventionnelle randomisée contrôlée ; ses deux bras étaient le groupe intervention (prise en charge conventionnelle + éducation par un groupe Facebook) et le groupe contrôle (prise en charge conventionnelle seule). Résultats : La population étudiée comprenait 60 patientes (30 dans le groupe d’intervention et 30 dans le groupe contrôle). Les deux groupes étaient comparables en termes d’âge, d’antécédents de diabète gestationnel, de statut socio-économique et de niveau d’instruction. L’intervention par groupe Facebook a été jugée très pertinente par 93 % des participantes ; l’utilité et la pertinence des messages ont été jugées optimales par 46,7 % et 56 % des membres du groupe, respectivement ; 76,7 % ont préféré le format de publication vidéo. Le score des pratiques de soins du groupe intervention a augmenté de 36 % à 60 % (p = 0,0001) ; les pratiques diététiques de 47 à 69 %, l’activité physique de 26 à 45 %, et l’autosurveillance de 24 à 57 %. Le score d’autosoins du groupe de contrôle est passé de 41 à 44 % (p = 0,023) ; les scores des pratiques alimentaires, l’autosurveillance et l’activité physique n’ont pas varié de façon significative. Conclusions : La combinaison d’une intervention par un groupe Facebook a la prise en charge conventionnelle a permis d’obtenir de meilleurs scores en matière d’autosoins que l’éducation en face-à-face seule. Par conséquent, Facebook peut être utile pour améliorer l’impact de l’éducation thérapeutique pour les patientes présentant un diabète gestationnel.
Was tut sich bei Neuroinflammation und Neurometabolik?
Authors: Borchard-Tuch Claudia
Published: April 2024

Die 48. Jahrestagung der Gesellschaft für Neuropädiatrie (GNP) im November in Dortmund verbindete Wissenschaft und Praxis und bietete eine breite Palette zur Weiterbildung. Einen Schwerpunkt bildeten die seltenen Erkrankungen. Zunehmende Kenntnisse ätiologischer Zusammenhänge und Entwicklungen neuer Therapieverfahren lassen auf mildere Krankheitsverläufe und eine bessere Langzeitprognose hoffen.
Melatonin als ärztliche Verordnung bei Schlafstörungen im Kindes- und Jugendalter?
Authors: Paditz Ekkehart
Published: April 2024

Melatonin ist ein stark wirksames Hormon, das in der Zirbeldrüse bei Dunkelheit pulsatil synthetisiert und sezerniert wird, sodass das Einschlafen unterstützt wird. Zusätzlich weist Melatonin eine ganze Reihe von Effekten als Radikalfänger auf. Tumore der Zirbeldrüse und der Pinealisregion weisen gleichlautend zu Untersuchungen bei jungen Erwachsenen und zu tierexperimentellen Befunden darauf hin, dass die Gabe von Melatonin u. a. auch negative Einflüsse auf die Pubertätsentwicklung haben kann. Kürzlich wurde über mehrere Todesfälle bei Säuglingen im zeitlichen Zusammenhang mit erheblicher Überdosierung von Melatonin berichtet.

Vor dem Hintergrund des begrenzten aktuellen Kenntnisstandes und der unzureichenden Daten über Langzeiteffekte sollte Melatonin bei Kindern und Jugendlichen mit ausgewählten nicht-organischen Schlafstörungen nur zurückhaltend und zunächst nur für maximal 6 Monate eingesetzt werden, nachdem eine ausführliche Anamnese und ein orientierender neurologischer Status erhoben wurden, Hinweise zur Schlafhygiene übermittelt wurden und nachdem verhaltenstherapeutische Interventionen keinen ausreichenden Effekt gezeigt hatten. Der unterschiedliche Zulassungsstatus für Melatoninpräparate in DACH weist auf die unterschiedlichen Grenzen für Verordnungen bzw. für Off-Label-Use hin.
Gesunde Schwangere, gesunde Neugeborene, ein angenehmes Geburtserlebnis
Authors: Rüdiger Mario
Published: April 2024

Liebe Mitglieder der DGPM!

Nach der Wahl im Dezember hat der neue Vorstand auf einer Klausurtagung Anfang
Februar die Arbeitsschwerpunkte der kommenden zwei Jahren sehr intensiv diskutiert.
An unseren Überlegungen zur Weiterentwicklung Ihrer Fachgesellschaft möchte ich Sie
hiermit gerne teilhaben lassen.
Physiolyse mit Resektion des Vickers-Bandes bei adoleszenten
Patienten mit Madelung-Deformität
Authors: Reck Alexander , Pillukat Thomas , van Schoonhoven Jörg
Published: April 2024

Hintergrund Die Madelung-Deformität ist eine angeborene oder erworbene
Wachstumsstörung des Unterarmes, die für betroffene Patienten mit erheblichen
Einschränkungen der Lebensqualität einhergehen kann. In der Literatur wurden
verschiedene Möglichkeiten der operativen Therapie der Erkrankung beschrieben.
Mit der vorliegenden Studie sollte der Frage nachgegangen werden, ob die
Physiolyse mit Resektion des Vickers-Bandes die Progredienz der Erkrankung in
einem eigenen jungen Patientenkollektiv erfolgreich aufhalten konnte, wie es
anhand der bisherigen Literatur zu diesem Thema zu erwarten wäre.

Material und Methoden Die Akten aller Patienten mit Madelung-Deformität,
die zwischen Januar 2001 und Juni 2017 primär mit einer Physiolyse mit Resektion
des Vickers-Bandes behandelt worden sind, wurden retrospektiv ausgewertet. Die
Patienten wurden zu einer Nachuntersuchung eingeladen und bezüglich des
OP-Outcomes untersucht. Erhoben wurden Schmerzen in Ruhe und unter Belastung,
der Bewegungsumfang der Handgelenke und das Aktivitätsniveau. Zudem wurden von
jedem operierten Handgelenk Röntgenbilder in zwei Ebenen angefertigt und
radiologische Messungen durchgeführt. Die so erhobenen Daten wurden mit den
Daten aus den Patientenakten verglichen.

Ergebnisse 9 Handgelenke wurden eingeschlossen. Das Durchschnittsalter zum
Zeitpunkt der Operation lag bei 13,2 Jahren, der durchschnittliche
Nachbeobachtungszeitraum betrug 5,0 Jahre. Die Extension und Ulnarduktion nahmen
von präoperativ bis zur Nachuntersuchung leicht ab, während sich die Beugung
minimal sowie die Radialduktion und die Unterarmdrehung erkennbar verbesserten.
Der Punktwert für Ruheschmerzen auf der visuellen Analogskala stieg von
präoperativ 0,25 Punkten auf 1,88 Punkte zum Zeitpunkt der Nachuntersuchung.
Unter Belastung stieg der durchschnittliche Punktwert für Schmerzen von 2,00 auf
4,25 Punkte. Der mittlere DASH-Score stieg von 6,04 Punkten vor der Operation
auf 12,20 Punkte zum Zeitpunkt der Nachuntersuchung. Die Durchschnittswerte von
zwei der fünf gemessenen McCarroll-Parameter stiegen an, im Fall der Absenkung
des Os Lunatum statistisch signifikant. Bei einem Handgelenk war ein
Folgeeingriffe erforderlich.

Schlussfolgerung Die Progredienz der Madelung-Deformität konnte in unserem
Kollektiv durch die Physiolyse mit Resektion des Vickers-Bandes nur teilweise
aufgehalten und eine signifikante Zunahme der Schmerzsymptomatik im
Untersuchungszeitraum nicht vermieden werden. Bei Patienten, die vor Abschluss
ihres Längenwachstums stehen, sollte dieses Verfahren daher mit Zurückhaltung
eingesetzt werden.
Digitale Prozesssteuerung in der Patientenlogistik: Vernetzt in die Zukunft
Authors: Schiller Natalie
Published: April 2024

Die Sicherung der umfassenden Notfallversorgung sowie Neuausrichtung und Zusammenführung von 4 Krankenhausstandorten auf 3, so geschehen im Klinikum Hochsauerland. Das Klinikum nutzte diesen Umbruch, um auch die Prozesse im Patiententransport zu digitalisieren und neu zu strukturieren. Vom Ergebnis profitieren in erster Linie die Patienten.
Aus dem Klinikalltag einer Zentralküche: Mittels Automatisierung und Rückverfolgbarkeit in die Zukunft
Authors: Lang Katharina
Published: April 2024

Mithilfe von Barcodes gelingt eine sichere Standortlokalisierung sowie eine eindeutige Identifikation von Klinik-Containern. Damit steigt die Patientensicherheit und die Personalbelastung wird reduziert.
Integration von Tageshospizen und palliativmedizinischen Tageskliniken in die regional hospizlich-palliative Versorgungslandschaft – Eine qualitative Untersuchung mittels Fokusgruppen und Interviews
Authors: Huperz Carolin , Apolinarski Beate , Röwer Hanna A. A. , Schneider Nils , Stiel Stephanie , Herbst Franziska A.
Published: April 2024

Ziel der Studie Hinderliche und förderliche Faktoren für die Integration von Tageshospizen und palliativmedizinischen Tageskliniken in lokale Versorgungsstrukturen in Deutschland werden untersucht.

Methodik In einem explorativen, qualitativen Studiendesign wurden Einrichtungsleitungen aus Tageshospizen und palliativmedizinischen Tageskliniken mittels semistrukturierter Telefoninterviews zu Entstehungsbedingungen und der Zusammenarbeit mit anderen Akteur*innen im Versorgungsnetzwerk befragt. Zusätzlich wurden Fokusgruppen mit Akteur*innen aus der regionalen Versorgungslandschaft der Tageseinrichtungen durchgeführt. Interviews und Fokusgruppen wurden inhaltsanalytisch ausgewertet.

Ergebnisse Insgesamt wurden 8 Interviews mit Einrichtungsleitungen sowie 4 Fokusgruppen mit jeweils 3–7 Akteur*innen durchgeführt. Wesentliche Einflussfaktoren auf die Implementierung sind: Nutzung bestehender Ressourcen sowie die Zusammenarbeit mit Akteur*innen aus der Region.

Schlussfolgerungen Eine gute Vernetzung der Tageseinrichtungen kann zu einer erfolgreichen Implementierung dieser beitragen.
Charge-transfer hyperbolic polaritons in α-MoO3/graphene heterostructures
Authors: Shen J. , Chen M. , Korostelev V. , Kim H. , Fathi-Hafshejani P. , Mahjouri-Samani M. , Klyukin K. , Lee G.-H. , Dai S.
Published: April 2024

Charge transfer is a fundamental interface process that can be harnessed for light detection, photovoltaics, and photosynthesis. Recently, charge transfer was exploited in nanophotonics to alter plasmon polaritons by involving additional non-polaritonic materials to activate the charge transfer. Yet, direct charge transfer between polaritonic materials has not been demonstrated. We report the direct charge transfer in pure polaritonic van der Waals (vdW) heterostructures of α-MoO3/graphene. We extracted the Fermi energy of 0.6 eV for graphene by infrared nano-imaging of charge transfer hyperbolic polaritons in the vdW heterostructure. This unusually high Fermi energy is attributed to the charge transfer between graphene and α-MoO3. Moreover, we have observed charge transfer hyperbolic polaritons in multiple energy–momentum dispersion branches with a wavelength elongation of up to 150%. With the support from the density functional theory calculation, we find that the charge transfer between graphene and α-MoO3, absent in mechanically assembled vdW heterostructures, is attributed to the relatively pristine heterointerface preserved in the epitaxially grown vdW heterostructure. The direct charge transfer and charge transfer hyperbolic polaritons demonstrated in our work hold great promise for developing nano-optical circuits, computational devices, communication systems, and light and energy manipulation devices.
Tilted dust-acoustic waves in low-pressure DC complex plasma
Authors: Wimmer L. , Schmitz A. S. , Kretschmer M. , Thoma M. H.
Published: April 2024

This study utilized the ground-based Plasmakristall-4 experiment to investigate the characteristics of dust-acoustic waves in low-pressure neon plasma generated through a direct current discharge. The experimental observations revealed the presence of dust-acoustic waves exhibiting a distinctive screw-like wavefront structure. Interestingly, the phase speed of these waves was slightly higher than the theoretical predictions. This deviation can be attributed to the influence of external forces and boundary conditions, which introduce asymmetry to the system and result in the deformation of wave patterns. To gain further insight, a comprehensive three-dimensional particle drift path reconstruction was conducted, providing a clearer understanding of the observed phenomena and confirming the findings obtained through the experimental analysis.
Spatiotemporal evaluation of five satellite-based precipitation products under the arid environment of Saudi Arabia
Authors: Jazem Ghanim Abdulnoor Ali , Anjum Muhammad Naveed , Alharbi Raid Saad , Aurangzaib Muhammad , Zafar Usama , Rehamn Abdur , Irfan Muhammad , Rahman Saifur , Faraj Mursal Salim Nasar , Alyami Saleh , Algobahi Redhwan M. , Alhamami Ali
Published: April 2024

In arid regions like Saudi Arabia, accurate precipitation data are crucial for water resource management and climate studies. However, satellite-based precipitation products (SPPs) can contain uncertainties, impacting their reliability. This study evaluated the accuracy of five high-resolution SPPs [IMERG-V06 variants, Tropical Rainfall Measuring Mission (TRMM)-3B42V7, and Soil Moisture to Rain (SM2RAIN)-Advanced SCATterometer (ASCAT)] over Saudi Arabia. We compared daily, monthly, and yearly precipitation estimates from SPPs with in situ rain gauge data (2010–2022) using both continuous and categorical metrics. The evaluation encompassed point-to-pixel comparisons, regional analysis, and national assessments. All SPPs effectively captured the spatiotemporal patterns of precipitation across the country. Notably, monthly estimates showed stronger agreement with rain gauge data than daily estimates, as indicated by higher correlation coefficients. IMERG products generally outperformed SM2RAIN-ASCAT and TRMM, with IMERG-LR exhibiting superior performance in estimating monthly precipitation. However, underestimation of light precipitation events (<2 mm/day) was observed across all SPPs. In addition, their ability to detect moderate and heavy precipitation events remained uncertain, requiring further investigation. While IMERG-FR showed reduced bias and root mean square error compared to IMERG-ER and IMERG-LR, its capability for precipitation event detection did not exhibit significant improvement. This study highlights the need for bias correction of IMERG-LR and IMERG-FR monthly estimates for improved application in hydrometeorological studies in Saudi Arabia. Our findings contribute valuable insights for both data users and SPP algorithm developers, aiming to enhance the accuracy and reliability of satellite-derived precipitation data in arid environments.
Enhancing ion transport in pressure-driven nanofluidic systems for energy harvesting
Authors: Zhou Le , Shi Dachuang , Gong Chengxin , Zhou Yanguang , Chen Jinsong , Li Zhigang
Published: April 2024

In this work, we propose a new design to enhance ion transport in pressure-driven nanofluidic systems for energy harvesting. The proposed system uses two counter-charged nanochannels, i.e., one of the channels is negatively charged while the other one is positively charged. Under a pressure gradient, cations and anions move through negatively and positively charged channels, respectively, in different directions and contribute to the streaming current. Molecular dynamics simulations are employed to study the effects of surface charge density, channel height, and pressure gradient on the streaming current. Compared with the traditional system, where the nanochannel is negatively charged, the streaming current in the proposed system can be enhanced by a factor up to 6.6. In addition to the involvement of both cations and anions, the enhanced current in the proposed system is caused by the strengthened ionic fluxes due to relatively low-energy barriers for ions entering the channels.
Analysis of boundary layer characteristics in supergravitational turbulent thermal convection
Authors: Liu Jing , Wang Dongpu , Zhong Jun , Sun Chao
Published: April 2024

We investigate the boundary layer characteristics within annular centrifugal Rayleigh–Bénard convection (ACRBC) considering a Rayleigh number Ra∈[108,1011], a Prandtl number Pr = 10.7, and an inverse Rossby number Ro−1=16. Our study is based on the temperature and velocity data obtained from direct numerical simulations. Different from the flow over a flat plate, the ACRBC system bifurcates into three regions: the plume-impacting regions, plume-ejecting regions, and plume-sweeping regions, and all three regions are moving with the zonal flow. Our focus is primarily on the temperature dynamics within the plume-sweeping region, where the wind of large-scale circulation shears the boundary. We determine the transient thermal boundary layer thickness over time using the slope method, relying on the temperature curve's orientation relative to the wall. Notably, the probability density function distribution of the thermal boundary layer thickness is reminiscent of traditional RBC systems, albeit with a more extended exponential tail. Employing a dynamic frame based on time resampling, we discern that the temperature boundary layer traits align with the Prandtl–Blasius boundary layer theory. In conclusion, we show that the exponential decay index for the thermal boundary layer thickness harmonizes with the system's heat transfer scaling law. It is found that the ratio between the inner and outer boundary layer thickness remains stable, providing theoretical guidance for the design and control of the internal flow field of high-speed rotating machinery.
Theorizing Communication. The Production of Theory in Communication Journals
Authors: Krämer Benjamin
Published: April 2024

If communication research is in a ‘theory crisis’ or if there is at least an unused potential for theorizing, one of the ways of addressing such challenges is to analyze actual strategies of theorizing. This is not only relevant for practical and educational purposes but can also be a starting point for a science and technology studies’ perspective on communication research. This article presents a first qualitative study of structures of theoretical frameworks and of strategies of theorizing employed in articles in major international communication journals, focusing not only on the theoretical sections proper but on all aspects of theoretical argumentation. The analysis identifies a multitude of strategies of conceptualization and recombination, perspective shifting, and critical analysis.
Remote measurement of transient heat flux based on the thermomagnetic effect
Authors: Yi WenTong , Cui XinChao , Du Zhongzhou , Liu Wenzhong
Published: April 2024

Heat flux is a physical quantity that characterises the strength of heat transfer per unit area. Heat transfer occurs with a temperature difference. Herein, a remote heat flux measurement method based on the thermomagnetic effect is proposed. Using Bloch’s law, Faraday’s law of electromagnetic induction, and Fourier’s law, a temperature measurement model from heat flux to magnetisation of the magnetic film and finally to the induced electromotive force in the Helmholtz coil is established. A compression corner was fabricated, and the heat flux measurement method was experimentally verified in a Mach 6 shock tube wind tunnel. In addition, a Schlieren experiment was performed for comparison. In the experiments, the temperature resolution of the magnetic film reached 0.36 K, and the temperature response reached 100 kHz. The range of the proposed heat flux measurement method is up to 5

MW

m

m

−

2

, and the measurement error is less than 10%. At a resolution of 10 μs, the change in heat flow is mapped when there is a transition for the magnetic film from flat to turbulent flow, which shows the different effects of hypersonic heat flux on the boundary layer and attachment position. The magnetic thin film shows the potential for heat flux estimation in our experiment.
A combined Liouville integrable hierarchy associated with a fourth-order matrix spectral problem
Authors: Ma Wen-Xiu
Published: April 2024

This paper aims to propose a fourth-order matrix spectral problem involving four potentials and generate an associated Liouville integrable hierarchy via the zero curvature formulation. A bi-Hamiltonian formulation is furnished by applying the trace identity and a recursion operator is explicitly worked out, which exhibits the Liouville integrability of each model in the resulting hierarchy. Two specific examples, consisting of novel generalized combined nonlinear Schrödinger equations and modified Korteweg–de Vries equations, are given.
Bipartite consensus problems of Lurie multi-agent systems over signed graphs: A contraction approach
Authors: Zhang 张 Xiaojiao 晓娇 , Wu 吴 Xiang 祥
Published: April 2024

This paper examines the bipartite consensus problems for the nonlinear multi-agent systems in Lurie dynamics form with cooperative and competitive communication between different agents. Based on the contraction theory, some new conditions for the nonlinear Lurie multi-agent systems reaching bipartite leaderless consensus and bipartite tracking consensus are presented. Compared with the traditional methods, this approach degrades the dimensions of the conditions, eliminates some restrictions of the system matrix, and extends the range of the nonlinear function. Finally, two numerical examples are provided to illustrate the efficiency of our results.
Prospects to study hyperon-nucleon interactions at BESIII*
Authors: Dai 代 Jianping 建平 , Li 李 Hai-Bo 海波 , Miao 妙 Han 晗 , Zhang 张 Jianyu 剑宇
Published: April 2024

The prospects to study hyperon-nucleus/nucleon interactions at BESIII and similar

colliders are analyzed in this paper. Utilizing the large quantity of hyperons produced by the decay of 10 billion

and 2.7 billion

collected at BESIII, the cross sections of several specific elastic and inelastic hyperon-nucleus reactions can be measured via scattering between hyperons and nucleus in the dense objects of the BESIII detector. Subsequently, the cross sections of the corresponding hyperon-nucleon interactions can be extracted from further phenomenological calculations. The interactions between antihyperons and nucleus/nucleon, including scattering and annihilation, can also be studied using the method proposed in this study. The results will definitely benefit the realization of precise probes for hyperon-nuclei/nucleus interactions and establish constraints to study the potential of strong interaction, the origin of color confinement, a unified model for baryon-baryon interactions, and the internal structure of neutron stars. In addition, the desirable prospects of corresponding studies in the future Super Tau-Charm Factory (STCF) are discussed and estimated in this study.
A numerical method for generation of shot peened surfaces
Authors: Li Yifan , Yang Wenming , Liang Shuaishuai , Li Jiang , Wang Yiming , Xu Chunling , Wang Xin , Chen Haosheng
Published: April 2024

Shot peening is a widely utilized surface modification technique, and the surface morphology of the treated materials plays a crucial role in determining their friction and fatigue properties. Surface morphology generation is a pivotal process in simulating shot-peened surface friction and other performance characteristics. However, there are limited available methods for shot-peened surfaces until now. In this paper, we present a method that directly specifies the height probability distribution and power spectrum to generate shot-peened surfaces. Compared to methods that specify height parameters, this method has more flexibility. This approach replaces the traditional Johnson transformation method with an optimization algorithm to generate height data that follows a high probability distribution, while the power spectrum is derived from the Fourier transform of an exponential autocorrelation function. The results show that this approach can generate shot-peened surfaces using any conventional height parameters, with a maximum difference in height parameters between the reconstructed surface and the original surface of no more than 18.63%. Compared to the Johnson transformation method, this method significantly reduces the errors in skewness and kurtosis of the generated surface. It offers rapid surface generation for shot-peened surfaces, leading to significant time and cost savings in experiments.
Functional effects of the spatial-varying lens mechanical properties in accommodation
Authors: Schumacher Justin , Lopez Raymundo Rodriguez , Larin Kirill , Manns Fabrice , Scarcelli Giuliano
Published: April 2024

Lens biomechanical properties are critical for our eyes to accommodate. While it is well understood that lens mechanical properties change with age, different experimental techniques have been used over the years, with varying results on how the lens modulus changes. In this study, we developed a spatial-varying elasticity model to characterize the overall elastic modulus of the lens and establish its effect on accommodation. First, to validate the model, ex vivo porcine lenses underwent compression testing using biopsy punches of different diameters to change the percentage of nucleus within samples. Importantly, we found that, indeed, changing nucleus/cortex spatial ratio produces dramatic (∼7-fold) increase in overall sample modulus. Comparing the model with human lens spatial ratios, we demonstrate how changing spatial mechanics are more influential than peak modulus changes on overall elastic modulus. Next, in vivo clinical measurements of the spatial-varying lens modulus were used to generate a simplified mechanical-optical model of accommodation. We defined an ellipsoid lens with patient-derived modulus and geometry measurements, and a statics simulation and ray tracing analysis were performed through the deformed and undeformed lens. The resulting accommodation estimates agree with general accommodation expectations.