bluuebunny/crossref_metadata_2025 huggingface dataset:
Condition‐based maintenance policy for a multi‐component system considering stochastic dependence and quality loss
Authors: Zhang Anming , Qi Faqun , Fu Peihong , Yu Luchuan , Zhou Hongming
Published: November 2024

The reliability evaluation of multi‐component systems has attracted increasing concern in academic and industrial circles. However, the research maintenance optimization for multi‐component systems is still underexplored due to the curse of dimensionality. This paper makes a novel contribution to the existing literature by proposing a condition‐based maintenance (CBM) policy for multi‐component systems with joint consideration of stochastic dependence and quality loss. The system is composed of critical and auxiliary components. The deterioration process of the critical component can be accelerated when the auxiliary one degrades to a certain state. Based on the states of the components, the operation cost of the system owing to quality loss is analyzed, and the operation cost is used as the threshold for the preventive maintenance (PM) decision. Semi‐regenerative technology is used to model the evolution process of the system, and the long‐run average cost is calculated. The optimal inspection period and PM threshold are derived by minimizing the long‐run average cost, and the stationary distribution of the system state under the optimal long‐run average cost is derived with a proposed algorithm. Sensitivity analysis is conducted to reveal the most sensitive parameter. Finally, an illustrative example is presented, and a comparison experiment with other maintenance policies is conducted to demonstrate the effectiveness of the proposed policy.
Mid‐Infrared Sensing Using a Hollow–Core Fiber in a Nonlinear Interferometer
Authors: Produit Thomas , Chakraborty Tanmoy , Deng Ang , Krivitsky Leonid , Chang Wonkeun , Paterova Anna V.
Published: November 2024

Increasing the interaction path length is a well‐known method for enhancing the sensitivity of the optical detection system. Hollow–core fibers (HCFs) represent a viable alternative to the traditional multi‐path cells offering low optical losses and strong confinement of the optical field. Here, the incorporation of an Antiresonant Hollow–core Fiber (AR‐HCF) section into a nonlinear interferometer, where the AR‐HCF section serves as a gas‐sensing cell operating in the IR range is presented. By exploiting the effect of nonlinear interference, the detection is brought into the more operation‐friendly visible range. The detection of methane (CH4) gas at mid‐IR wavelengths within a half‐meter section of AR‐HCF, with an estimated concentration accuracy of 200 ppm·m is demonstrated. These results represent the combination of two research fields within a single instrument and pave the way for further advancement of quantum‐inspired gas sensing techniques.
Sense‐Making Through Hybrid Talk: High‐Achieving Secondary Students' Language Use during Practical Work
Authors: Kolstø Stein Dankert , Stadler Matthias G.
Published: November 2024

This study contributes to discussions on facilitating students' sense‐making in science by analyzing the utterances of high‐achieving students in dialogues during practical work and identifying characteristics of their language use and learning processes. The context of the study is a general science course at an upper secondary school in Norway. During four lessons, students from two classes conducted three exercises in electrochemistry. Data consist of video recordings from group work and whole‐class dialogues, students' written explanations, and their grades in science. Using the Bakhtinian concept of hybrid constructions (i.e., utterances including both vernacular and scientific elements), we analyze dialogues about scientific concepts and possible explanations for observations made during practical work. The analysis focuses on mixed‐ability groups that include one or two high‐achieving students. These students' successful learning processes enable the identification of language use that is part of sense‐making dialogues. We found that all students participating in dialogues used a mixture of vernacular talk, hybrid constructions, and scientific language during their learning processes. The content of scientific explanations proposed by high‐achieving students initially tended to be correct but superficial. The content then became more complex and hybrid and displayed errors and inaccuracies when students discussed detailed explanatory mechanisms, and finally, it became complex and largely correct. The results indicate that the high‐achieving students' use of hybrid constructions during practical work was beneficial for their learning. We discuss challenges related to creating situations in science teaching that encourage all students to engage in hybrid talk during sense‐making dialogues.
Metallo‐Surfactant Complex‐Assisted Biomimetic Synthesis of Silver Nanoparticles: Exploring Relativistic Effects in Catalytic and Sensing Applications
Authors: Nagaraj Karuppiah , Velmurugan Gunasekaran , Thangamuniyandi Pilavadi , Govindasamy Chandramohan , Kamalesu Subramaniam , Vasava Mahesh , Prajapathi Prajesh , Kaliyaperumal Raja , Vaishnavi Ellappan
Published: November 2024

A biological reduction method for silver nanoparticles was employed using Cassia alata extract from plant leaves, which functions as a reducing agent and the metallo‐surfactant [Co(dqn)2(C12H27N)2]3+ (dqn = dipyrido[3,2‐f:2′,3′‐h]‐quinoxaline; C12H27N)2 = dodecylamine) acting as both stabilizing and capping agent. The ratio of Ag nanoparticles (AgNPs) formation was adjusted to be equal to the amount of AgNO3, along with variations in the amount of plant leaf extract, the metallo‐surfactant, pH, surrounding temperature, and the length of interaction periods. High‐resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FE‐SEM), energy‐dispersive spectroscopy (EDS), and energy‐dispersive X‐ray analysis (EDAX) were used to confirm the formation of AgNPs. The infrared results indicate the presence of hydroxyl, amine, and carboxylate groups in the extract plays a crucial role in the reduction process. Additionally, the metallo‐surfactant acts as a capping agent for the silver nanoparticles, preventing agglomeration. By adjusting the acidity of the solution and the quantity of the additive metallo‐surface active agent utilized, the size of AgNPs can be precisely regulated. The relativistic effects observed in this metallo‐surfactant‐assisted silver nanoparticle demonstrate excellent reduction capabilities for nitro compounds, effective dye degradation, and mercury sensing applications.
On the nature, predictors, and outcomes of work passion profiles: A generalisability study across distinct types of employees
Authors: Gillet Nicolas , Morin Alexandre J. S. , Brault Stéphanie , Becker Margaux , Verbeke Iria
Published: November 2024

Thus far, little research has adopted a person‐centred approach to investigate the nature of work passion profiles. As a result, our understanding of the most commonly occurring combinations of harmonious passion (HP) and obsessive passion (OP) in the workplace remains limited. To achieve a more refined understanding of the nature of these work passion profiles, our first aim was thus to identify the configurations of HP and OP for work observed among five samples, including 11 subsamples, of employees (N = 7258). Then, we also considered the extent to which these profiles and their associations with theoretically‐relevant predictors (work‐home segmentation and organisational support) and outcomes (work engagement, work‐family conflict, turnover intentions, presenteeism, and counterproductive work behaviours) generalised across all subsamples. We identified a total of five profiles with a structure that differed slightly across samples: High OP Dominant, High HP Dominant, Average HP Dominant, Low HP Dominant (i.e., low levels of passion dominated by higher levels of HP relative to OP), and Moderately Low Passion. The High OP Dominant profile was systematically the most prevalent (37.5%–54.1% of the sample), whereas the High HP Dominant was the least prevalent (2.1%–7.7%). Across all samples, work‐home segmentation was related to a higher likelihood of membership into the profiles characterised by higher, relative to lower or moderate, levels of passion (HP and OP), whereas organisational support also helped employees to stay away from the High OP Dominant profile. Lastly, the least desirable outcomes were observed in the High OP Dominant profile, whereas the most desirable outcomes were observed in the High HP Dominant profile. Interestingly, work engagement levels where comparable in these two profiles. Beyond their theoretical implications for research on work passion, these results highlight how work passion has highly similar implications across contexts.
Phage‐Templated Synthesis of Targeted Photoactive 1D‐Thiophene Nanoparticles
Authors: Costantini Paolo Emidio , Saporetti Roberto , Iencharelli Marika , Flammini Soraia , Montrone Maria , Sanità Gennaro , De Felice Vittorio , Mattioli Edoardo Jun , Zangoli Mattia , Ulfo Luca , Nigro Michela , Rossi Tommaso , Di Giosia Matteo , Esposito Emanuela , Di Maria Francesca , Tino Angela , Tortiglione Claudia , Danielli Alberto , Calvaresi Matteo
Published: November 2024

Thiophene‐based nanoparticles (TNPs) are promising therapeutic and imaging agents. Here, using an innovative phage‐templated synthesis, a strategy able to bypass the current limitations of TNPs in nanomedicine applications is proposed. The phage capsid is decorated with oligothiophene derivatives, transforming the virus in a 1D‐thiophene nanoparticle (1D‐TNP). A precise control of the shape/size of the nanoparticles is obtained exploiting the well‐defined morphology of a refactored filamentous M13 phage, engineered by phage display to selectively recognize the Epidermal Growth Factor Receptor (EGFR). The tropism of the phage is maintained also after the bioconjugation of the thiophene molecules on its capsid. Moreover, the 1D‐TNP proved highly fluorescent and photoactive, generating reactive oxygen species through both type I and type II mechanisms. The phototheranostic properties of this platform are investigated on biosystems presenting increasing complexity levels, from in vitro cancer cells in 2D and 3D architectures, to the in vivo tissue‐like model organism Hydra vulgaris. The phage‐templated 1D‐TNP showed photocytotoxicity at picomolar concentrations, and the ability to deeply penetrate 3D spheroids and Hydra tissues. Collectively the results indicate that phage‐templated synthesis of organic nanoparticles represents a general strategy, exploitable in many diagnostic and therapeutic fields based on targeted imaging and light mediated cell ablation.
CAPP: Context‐Aware Privacy‐Preserving Continuous Authentication in Smartphones
Authors: Jacob Susmi , Vinod P. , Menon Varun G.
Published: November 2024

The pervasive use of smart devices in everyday life has increased the risk of theft and cyberattacks, necessitating robust and continuous behavioral authentication techniques during every interactive session. Traditional authentication methods are insufficient to address these evolving threats, as they often fail to maintain security throughout the session. To address this challenge, we propose a continuous authentication scheme that leverages touch and motion sensors, incorporating user context to enhance security. However, building an effective authentication model requires creating a behavioral template by aggregating data from multiple users. Moreover, outsourcing sensitive sensor data to third‐party servers for processing introduces the risk of privacy breaches, such as behavioral profiling or the theft of personal information. To mitigate these risks, we designed CAPP—a context‐aware privacy‐preserving data outsourcing scheme for continuous authentication during live sessions. CAPP employs Format Preserving Encryption (FPE) to encrypt the sensor data, ensuring that the data's format remains intact, which allows the machine learning model to function with minimal loss of accuracy. Our solution enables secure and efficient authentication by creating a model on the server side using data from motion sensors like the accelerometer, gyroscope, and magnetometer. Our experimental results demonstrate the effectiveness of the proposed scheme, achieving an accuracy of 87.57% and an Equal Error Rate (EER) of 12.15%, while requiring only 1.69 ms to authenticate a user. These results show that CAPP preserves user privacy and provides a rapid and reliable authentication process, outperforming existing state‐of‐the‐art methods.
Designing Tin and Hard Carbon Architecture for Stable Sodium‐Ion Battery Anode
Authors: Shahzad Rana Faisal , Rasul Shahid , Mamlouk Mohamed , Brewis Ian , Shakoor Rana Abdul , Zia Abdul Wasy
Published: November 2024

The lack of anodes stability is one among key barriers to the widespread commercialization of sodium‐ion batteries (SIBs). This is attributed to graphite, a well‐known common anode material for a range of commercial batteries including lithium‐ion batteries (LIBs), which limits the insertion of sodium (Na) ions due to their large ionic size. Tin (Sn) has shown its potential as a suitable anode material because it exhibits high capacities in conversion and alloying reactions. However, it endures significant volumetric expansion and slower reaction rates during sodiation. To overcome these challenges, this work presents a novel anode material for SIBs where a 2D layered architecture of Sn with a hard carbon (HC) buffer layer is engineered using physical vapor deposition technique. This novel anode (SnHT/HC) exhibits a high initial capacity of 470 mAhg−1 and an exceptional retention of 438 mAhg−1 after 3000 cycles at 0.2C, with 99 % Coulombic efficiency. SnHT/HC testing at varying fast charge and discharge C‐rate of 5C, 10C, 15C, and 50C has shown promising results. Better electron transport and reduced volumetric changes are perceived to enhance the overall performance of SnHT/HC electrodes.
Spatial Extremal Modelling: A Case Study on the Interplay Between Margins and Dependence
Authors: Kakampakou Lydia , Simpson Emma S. , Wadsworth Jennifer L.
Published: November 2024

It is no secret that statistical modelling often involves making simplifying assumptions when attempting to study complex stochastic phenomena. Spatial modelling of extreme values is no exception, with one of the most common such assumptions being stationarity in the marginal and/or dependence features. If non‐stationarity has been detected in the marginal distributions, it is tempting to try to model this while assuming stationarity in the dependence, without necessarily putting this latter assumption through thorough testing. However, margins and dependence are often intricately connected and the detection of non‐stationarity in one feature might affect the detection of non‐stationarity in the other. This work is an in‐depth case study of this interrelationship, with a particular focus on a spatio‐temporal environmental application exhibiting well‐documented marginal non‐stationarity. Specifically, we compare and contrast four different marginal detrending approaches in terms of our post‐detrending ability to detect temporal non‐stationarity in the spatial extremal dependence structure of a sea surface temperature dataset from the Red Sea.
Petri net modeling and analysis of an IoT‐enabled system for real‐time monitoring of eggplants
Authors: Yang Cheng‐Ying , Lin Yi‐Nan , Shen Victor R. L. , Shen Frank H. C. , Lin Yan‐Cheng
Published: November 2024

As the current agricultural industry is facing several challenges such as climate changes and lack of qualified farmers, it is extremely necessary to ensure sustainable agriculture and food supply by smart farming (SF). The SF can assist farmers and the associated stakeholders in making correct decisions on improving the yield and quality of agricultural products. In this study, an SF system based on low‐cost Raspberry Pi and Internet of Things (IoT) technologies has been successfully implemented. Through the data items detected by sensors to deeply manage the planting process, the IoT‐enabled communication protocol under ISO standards of Message Queuing Telemetry Transport (MQTT) was used. The bar charts of real‐time environmental parameters are presented on ThingsBoard to achieve the goal of data visualization. Meanwhile, a web server is built for the customized requirements, and the historical datasets are stored in the SQLite database system. Furthermore, a Petri net (PN) model was employed to detect all possible abnormal processes and to verify the feasibility and soundness of an IoT‐enabled system by using a software tool, WoPeD. Finally, the experimental results show that the plants cultivated by the proposed IoT‐enabled system are superior to those cultivated by the existing systems in many perspectives, including the monitoring distance, power consumption, precision, deadlock detection, and running time.
Data Science Guiding Analysis of Organic Reaction Mechanism and Prediction
Authors: Tâmega Giovanna Scalli , Costa Mateus Oliveira , de Araujo Pereira Ariel , Barbosa Ferreira Marco Antonio
Published: November 2024

Advancements in synthetic organic chemistry are closely related to understanding substrate and catalyst reactivities through detailed mechanistic studies. Traditional mechanistic investigations are labor‐intensive and rely on experimental kinetic, thermodynamic, and spectroscopic data. Linear free energy relationships (LFERs), exemplified by Hammett relationships, have long facilitated reactivity prediction despite their inherent limitations when using experimental constants or incorporating comprehensive experimental data. Data‐driven modeling, which integrates cheminformatics with machine learning, offers powerful tools for predicting and interpreting mechanisms and effectively handling complex reactivities through multiparameter strategies. This review explores selected examples of data‐driven strategies for investigating organic reaction mechanisms. It highlights the evolution and application of computational descriptors for mechanistic inference.
Nanomotors as Therapeutic Agents: Advancing Treatment Strategies for Inflammation‐Related Diseases
Authors: Luo Min , Zhao Fu‐kun , Wang Yuan‐min , Luo Yong
Published: November 2024

Inflammation is a physiological response of the body to harmful stimuli such as pathogens, damaged cells, or irritants, involving a series of cellular and molecular events. It is associated with various diseases including neurodegenerative disorders, cancer, and atherosclerosis, and is a leading cause of global mortality. Key inflammatory factors, such as Tumor Necrosis Factor‐alpha (TNF‐α), Interleukin‐1 (IL‐1), Interleukin‐6 (IL‐6), Monocyte Chemoattractant Protein‐1 (MCP‐1/CCL2), RANTES (CCL5), and prostaglandins, play central roles in inflammation and disease progression. Traditional treatments such as NSAIDs, steroids, biologic agents, and antioxidants have limitations. Recent advancements in nanomaterials present promising solutions for treating inflammation‐related diseases. Unlike nanomaterials that rely on passive targeting and face challenges in precise drug delivery, nanomotors, driven by chemical or optical stimuli, offer a more dynamic approach by actively navigating to inflammation sites, thereby enhancing drug delivery efficiency and therapeutic outcomes. Nanomotors allow for controlled drug release in response to specific environmental changes, such as pH and inflammatory factors, ensuring effective drug concentrations at disease sites. This active targeting capability enables the use of smaller drug doses, which reduces overall drug usage, costs, and potential side effects compared to traditional treatments. By improving precision and efficiency, nanomotors address the limitations of conventional therapies and represent a significant advancement in the treatment of inflammation‐related diseases. This review summarizes the latest research on nanomotor‐mediated treatment of inflammation‐related diseases and discusses the challenges and future directions for optimizing their clinical translation.
Unlocking Opportunities: How Women Navigate Informal Networks in Saudi Arabia's Evolving Workplace
Authors: Ali Sa'ad , AlQahtani Munirah , Mrabet Mansour
Published: November 2024

In the context of the Arab countries of the Middle East, Wasta informal networks predominate in the business environment. While historically women in the Kingdom of Saudi Arabia had limited access to informal networks, recent socio‐economic changes have had a positive impact on women's participation in the workplace. This research explores the use of Wasta informal networks by women in the context of the new Saudi workplace based on 26 interviews conducted with Saudi professional women. The findings highlight that, due to the changes in the formal institutions, which in turn impact informal institutions, women are generally afforded more direct access to networks, enabling them to attain jobs and progress their careers. The research also contributes to informal network literature by distinguishing between Wasta (negative practice) and other forms of informal networks (positive/beneficial practice). Suggestions are offered to policymakers, managers, and women practitioners to navigate the use of informal networks and Wasta.
Reading Prosody: A Listening Guide for Teachers
Authors: Sáez Leilani , Whitney Makayla , Nese Joseph F. T. , Alonzo Julie , Nese Rhonda N. T.
Published: November 2024

Prosody is an important indicator of reading development, but many teachers are unclear about how it can help students improve their reading fluency. Beyond demonstrating expressive or flowing reading, specific components of reading prosody can distinctly reveal how well word recognition and comprehension processes coalesce, providing teachers with useful information for their instruction. In this article, we review the research on reading prosody to clarify how differences in intonation, amplitude, and timing components distinguish struggling and strong readers. In addition, we discuss reading prosody considerations for classroom assessment and intervention by sharing insights drawn from educators trained to evaluate it systematically. We aim to clarify how teachers can use these reading prosody components to enhance classroom reading fluency practices.
Safety of thyroidectomy as day care surgery at a rural setting in Eastern Uganda
Authors: Okello Damoi Joseph , Abeshouse Marnie , Giibwa Angellica , Binoga Moses , Yu Allen T. , Okeny Paul K. , Divino Celia , Marin Michael L. , Lee Denise
Published: November 2024

Background

The practice of day care surgery is less embraced in many low‐middle‐income countries (LMIC), and even less for some procedures considered major such as thyroidectomy. Here we examine the safety of day care thyroidectomy at Kyabirwa Surgical Center, a stand‐alone day care surgery center in rural Eastern Uganda.

Methods

This was a retrospective cohort study conducted between 2019 and 2023. All patients who had day care thyroidectomy were included. Demographics, diagnosis, investigation findings, pathology reports, and surgery outcomes were collected. Postoperative follow‐up data up to 30 days were also collected. Data were analyzed using R version 4.3.2.

Results

A total of 51 patients underwent same‐day thyroidectomy, with an average age of 44.9 ± 12.1 years and 98% female. Procedures included total thyroidectomy (5, 9.8%), subtotal thyroidectomy (26, 51.0%), and lobectomy (20, 39.2%). Average size of the glands was 7.9 ± 2.21 cm. The majority 46 (90.2%) were of benign pathology. All patients were discharged by the evening of the same day. Complications encountered included hypocalcemia (1), hypertrophic scar (1), seroma (2), and transient recurrent laryngeal nerve injury (1). Overall complications rate was 9.8%. Gland size was statistically significant between patients with no complications (7.68 ± 2.06 cm) versus complications (9.90 ± 2.82, p < 0.05).

Conclusion

With overall low complication rates, these findings suggest that thyroidectomy can safely be performed on a day care basis in a rural LMIC setting with suboptimal health care delivery.
3d Carrollian Chern-Simons theory & 2d Yang-Mills
Authors: Bagchi Arjun , Lipstein Arthur , Mandlik Mangesh , Mehra Aditya
Published: November 2024

Abstract

With the goal of building a concrete co-dimension one holographically dual field theory for four dimensional asymptotically flat spacetimes (4d AFS) as a limit of AdS4/CFT3, we begin an investigation of 3d Chern-Simons matter (CSM) theories in the Carroll regime. We perform a Carroll (speed of light c → 0) expansion of the relativistic Chern-Simons action coupled to a massless scalar and obtain Carrollian CSM theories, which we show are invariant under the infinite dimensional 3d conformal Carroll or 4d Bondi-van der Burg-Metzner-Sachs (BMS4) symmetries, thus making them putative duals for 4d AFS. Concentrating on the leading-order electric Carroll CSM theory, we perform a null reduction of the 3d theory. Null reduction is a procedure to obtain non-relativistic theories from a higher dimensional relativistic theory. Curiously, null reduction of a Carrollian theory yields a relativistic lower-dimensional theory. We work with SU(N) × SU(M) CS theory coupled to bi-fundamental matter and show that when N = M, we obtain (rather surprisingly) a 2d Euclidean Yang-Mills theory after null reduction. We also comment on the reduction when N ≠ M and possible connections of the null-reduced Carroll theory to a candidate 2d Celestial CFT.
Superconformal monodromy defects in ABJM and mABJM theory
Authors: Arav Igal , Gauntlett Jerome P. , Jiao Yusheng , Roberts Matthew M. , Rosen Christopher
Published: November 2024

Abstract

We study D = 11 supergravity solutions which are dual to one-dimensional superconformal defects in d = 3 SCFTs. We consider defects in ABJM theory with monodromy for U(1)4 ⊂ SO(8) global symmetry, as well as in 𝒩 = 2 mABJM SCFT, which arises from the RG flow of a mass deformation of ABJM theory, with monodromy for U(1)3 ⊂ SU(3) × U(1) global symmetry. We show that the defects of the two SCFTs are connected by a line of bulk marginal mass deformations and argue that they are also related by bulk RG flow. In all cases we allow for the possibility of conical singularities at the location of the defect. Various physical observables of the defects are computed including the defects conformal weight and the partition function, as well as associated supersymmetric Renyi entropies.
Initial surgical management of injuries to the lower extremities in patients with multiple and/or severe injuries – A systematic review and clinical practice guideline update
Authors: Jensen Kai Oliver , Prediger Barbara , Könsgen Nadja , Teuben Michel Paul Johan
Published: November 2024

Purpose

Our aim was to develop new evidence-based and consensus-based recommendations for the initial inhospital management of lower-extremity injuries in patients with multiple and/or severe trauma. This guideline topic is part of the 2022 update of the German Guideline on the Treatment of Patients with multiple and/or severe Injuries.

Methods

MEDLINE and Embase were systematically searched to May 2021. Randomised controlled trials, prospective cohort studies, and comparative registry studies were included if they compared interventions for the initial surgical and non-surgical management of fractures, dislocations or vascular injuries of the lower extremities in patients with multiple and/or severe trauma. We considered patient-relevant clinical outcomes such as mortality, complication rates, length of stay, and function. Risk of bias was assessed using NICE 2012 checklists. The evidence was synthesised narratively, and expert consensus was used to develop recommendations and determine their strength.

Results

Eleven studies were identified. They addressed time to definitive fixation (n = 10 studies) and amputation (n = 1). Two new recommendations were developed, one was modified. All recommendations achieved strong consensus.

Conclusion

This systematic literature review and subsequent expert consensus process resulted in the following new key recommendations. It is recommended that isolated and multiple lower-extremity fractures are managed with primary definitive fixation in patients whose condition is stable. Patients condition is not considered stable should be managed with primary temporary fixation. In addition, it is recommended that dislocations of the lower extremities are reduced and immobilised as early as possible.
Enhancing the cooling performance of thermocouples: a power-constrained topology optimization procedure
Authors: Gutiérrez G. Reales , Keulen F. van , Goosen J. F. L. , Aragón A. M. , Bornheim A.
Published: November 2024

Heat pumping through thermoelectric devices has many advantages over traditional cooling. However, their current efficiency is a limiting factor in their implementation. In this paper, we approach the non-convex topology optimization of thermoelectrical elements for cooling applications through the method of moving asymptotes (MMA) to improve their cooling capabilities per watt usage. The optimization problem is defined for a given power budget, aiming for the minimum temperature with a known heat pumping need. The introduction of power as a constraint justifies the introduction of the voltage gradient across the thermocouple as a design variable to maintain the thermoelectrical device in its optimum power-to-heat extraction ratio. To better understand the convergence of this non-convex problem, we present a two-variable analytical thermoelectric optimization model. This example provides information on how to select the penalty parameters used to scale the three material coefficients involved in the problem to obtain lower objective values and better convergence using MMA. The analytical model shows the non-convexity of the problem and provides the recommendation to use penalization coefficients of the form $$p_k=p_{\sigma }>p_{\alpha }=1$$

p
k

=

p
σ

>

p
α

=
1

for the thermal conductivity, electrical conductivity, and Seebeck coefficients. We tested these penalization coefficients through optimizations of a model based on the 1MC10-031 commercial thermoelectric-cooler (TEC) using the finite element method (FEM). These penalization coefficients provided local minima without the need for volume constraints. With this procedure, we found designs that provided temperatures close to 10 degrees lower using 60% less semiconductor material volume compared to the initial design.
A novel approach based on a mathematical algorithm and measurement of involute flanks for computing spur gear dimensions with unknown parameters
Authors: Khalil Abdallah , Shalaby Heba , Damir Mohamed
Published: November 2024

Involute gears of all sizes and types are widely utilized in most machinery. Accurate generation of teeth flanks from the nominally required base circle is most vital in gear manufacturing, performance, and inspection. Despite the vital importance of the base circle in actual gear performance, it is not a widely used inspection parameter. Moreover, the size of base circle radius and geometrical center cannot be obtained by direct measurement. In this work, a new mathematical algorithm was developed to evaluate the base circle dimensions by measurement of only the teeth profiles. Measurement of the outer diameter is not required nor is the prior knowledge of any gear dimension such as its module or pressure angle. The evaluated base circle dimensions are then used to compute remaining dominant gear dimensions including its pressure angle. The developed approach was tested on an ideal gear model then applied to the flank points obtained by measurements performed on a Coordinate Measuring Machine (CMM) and by photogrammetry (PG). The experimental results were compared to those measured using a gear roll tester (GRT) and were found to be in very good agreement. The methodology and measurement procedure presented in this work are distinguished by their ability to measure the actual gear dimensions regardless of any tooth modification made to the profile or addendum during manufacturing. This makes the proposed work well-suited for reverse engineering and rapid prototyping reverse calculations.
Sacrospinous Hysteropexy—Video Tutorial of Construction and Application of a Feasible and Inexpensive Teaching Model for Simulation
Authors: Carlin Greta Lisa , Umek Wolfgang , Bodner-Adler Barbara , Mikula Fanny Carolina , Lange Sören
Published: November 2024

Introduction and Hypothesis

Sacrospinous hysteropexy is one of the preeminent uterus-preserving surgical techniques for treating pelvic organ prolapse supported by level one evidence. As training on models greatly improves surgical skills and outcomes, we developed a simple and inexpensive model to simulate sacrospinous hysteropexy.

Methods

A step-by-step instruction for the production of the model is available to be viewed online. To keep production costs low, readily available materials were used, with a total cost per model of about 2 EUR (Austria, August 2023). All important anatomical landmarks (prolapsing uterus, vagina, ischial spine and sacrospinous ligament) were all represented. We present a detailed instructional video on how to construct the model and the practical training, detailing the individual steps of a successful sacrospinous hysteropexy, available online. Thus, trainees are able to practice the individual movements of the entire surgical procedure on this simulator model guided by the tutorial video. In this way, trainees will be able to practice the entire surgical procedure.

Results

An introduction to the model with explanation of all anatomical landmarks and a standardised explanation of the surgery with its individual steps (handout distributed).

Conclusion

The presented video showcases the feasibility of the easy construction and application of a model for the surgical skill training of sacrospinous hysteropexy. Easily accessible, inexpensive material and its simple build make this a reproducible model regardless of geographic or socioeconomic resources.
Non-archimedean topological monoids
Authors: Megrelishvili M. , Shlossberg M.
Published: November 2024

We say that a topological monoid S is left non-archimedean (in short: l-NA) if the left action of S on itself admits a proper S-compactification $$\nu :S \hookrightarrow Y$$

ν
:
S
↪
Y

such that Y is a Stone space. This provides a natural generalization of the well known concept of NA topological groups. The Stone and Pontryagin dualities play a major role in achieving useful characterizations of NA monoids. We show that many naturally defined topological monoids are NA and present universal NA monoids. Among others, we prove that the Polish monoid $$C(2^{\omega },2^{\omega })$$

C
(

2
ω

,

2
ω

)

is a universal separable metrizable l-NA monoid and the Polish monoid $${\mathbb {N}}^{\mathbb {N}}$$

N

N

is universal for separable metrizable r-NA monoids.
Microbial communities and their role in enhancing hemp fiber quality through field retting
Authors: Bou Orm Eliane , Bergeret Anne , Malhautier Luc
Published: November 2024

The current development of industrial hemp “Cannabis Sativa L.” fibers for technical textiles and industrial applications requires high-quality fibers with homogeneous properties. However, several factors have been reported to influence the fibers’ intrinsic properties, including a post-harvest process known as retting. This process plays a crucial role in facilitating the mechanical extraction of fibers from hemp stems. Retting involves the degradation of the amorphous components surrounding the fiber bundles enabling their decohesion from stems. Microorganisms play a central role in mediating this bioprocess. During retting, they colonize the stems’ surface. Therefore, the biochemical components of plant cell wall, acting as natural binding between fibers, undergo a breakdown through the production of microbial enzymes. Although its critical role, farmers often rely on empirical retting practices, and considering various biotic and abiotic factors, resulting in fibers with heterogenous properties. These factors limit the industrial applications of hemp fibers due to their inconsistent properties. Thus, the purpose of this review is to enhance our comprehension of how retting influences the dynamics of microbial communities and, consequently, the evolution of the biochemical properties of hemp stems throughout this process. Better understanding of retting is crucial for effective process management, leading to high-value fibers.

Key points

• Retting enables degradation of cell wall components, controlling fiber properties.

• Microbial enzymatic activity is crucial for successful decohesion of fiber bundles.

• Understanding retting mechanisms is essential for consistent fiber production.
Network creation with homophilic agents
Authors: Bullinger Martin , Lenzner Pascal , Melnichenko Anna
Published: November 2024

Network Creation Games are an important framework for understanding the formation of real-world networks. These games usually assume a set of indistinguishable agents strategically buying edges at a uniform price, which leads to the formation of a network among them. However, in real life, agents are heterogeneous and their relationships often display a bias towards similar agents, say of the same ethnic group. This homophilic behavior on the agent level can then lead to the emergent global phenomenon of social segregation. We study Network Creation Games with multiple types of homophilic agents and non-uniform edge cost, introducing two models focusing on the perception of same-type and different-type neighbors, respectively. Despite their different initial conditions, both our theoretical and experimental analysis show that both the composition and segregation strength of the resulting stable networks are very similar, indicating a robust structure of social networks under homophily.
Paracetamol versus ibuprofen for early postpartum pain control: a randomized controlled trial
Authors: Ram Shai , Madar Dotan , Ram Hila Shalev , Peleg Goni , Lior Yotam , Greenfeld Ayelet , Yakov Gala , Yogev Yariv , Maslovitz Sharon
Published: November 2024

Introduction

To evaluate the effectiveness of paracetamol and ibuprofen as non-opioid treatments for postpartum pain control after vaginal delivery.

Materials and methods

This randomized controlled study at a university-affiliated medical center involved parturient who received blindly oral tablets of either 1000 mg of paracetamol or 400 mg of ibuprofen, post-vaginal birth. Pain levels were assessed using a numeric rating scale (NRS) at four time points: before treatment, and 1, 4, and 6 h post-treatment (T0, T1, T4, and T6, respectively). We also compared the need for additional analgesia, breastfeeding initiation, mobilization, and urination following the delivery between the groups. To ensure statistical power, the study was designed to detect differences of one point on the NRS with at least 37 women per group.

Results

A total of 107 women participated, including paracetamol (n = 52) and ibuprofen (n = 55) groups. Demographics and perinatal outcomes were similar across groups. No significant differences were found in the interval between delivery and request for pain control (8 ± 6–10.5 and 11 ± 6–16 h for the paracetamol and the ibuprofen, respectively, P = .13). Pain levels on the NRS were similar for both groups at all intervals. There were also no group differences in the time to the initiation of breastfeeding, mobilization, urination, or the need for additional analgesia.

Conclusion

Both, paracetamol and ibuprofen, can be considered equivalent and effective non-opioid alternatives for postpartum pain control.

Registry at clinicaltrials.gov

(NCT04653506), https://register.clinicaltrials.gov/prs/beta/studies/S000AFOR00000066/recordSummary.
Improving communication between volcano observatories and volcanic ash advisory centres in Europe—outcomes from a first workshop
Authors: Witham Claire , Kristiansen Nina , Gurioli Lucia
Published: November 2024

Effective aviation response to atmospheric emissions from volcanic eruptions relies upon timely communication and information exchange. To explore the current and best practices in this area, a workshop was held in February 2019 under the framework of the European H2020 EUROVOLC project (2018–2021). The objective of the workshop was to bring together the volcano observatories (VOs), volcanic ash advisory centres (VAACs), and volcanological research institutes in Europe. The workshop included scientists and operational staff from six of Europe’s VOs (Iceland, Italy, France, Spain, Portugal, and Greece), the London and Toulouse VAACs, and seven supporting institutions and organisations. During the workshop, participants identified future improvements to the way the VOs and VAACs communicate and share information. Recommendations include refining the guidance and local documentation on the correct use of the Volcano Observatory Notice for Aviation (VONA), improving the two-way feedback between the VAAC and VOs, regular sharing of volcano status updates by the VO, and inclusion of all VOs in regular VAAC and aviation exercises. These are applicable to VOs and VAACs elsewhere in the world.
Online video versus face-to-face patient–surgeon consultation: a systematic review
Authors: ten Haaft Britte H. E. A. , Montorsi Roberto M. , Barsom Esther , Kazemier Geert , Schijven Marlies P. , Besselink Marc G.
Published: November 2024

Background

Online video consultation (OVC) is increasingly used in patient–surgeon pre-surgical and follow-up consultation but a comprehensive review assessing its benefits and downsides as compared to face-to-face (F2F) consultation is currently lacking. This systematic review evaluated the effectiveness of OVC as compared to F2F consultation.

Methods

A literature search (Ovid/Medline, Embase, and Clarivate Analytics/Web of Science Core Collection) was conducted including studies comparing efficacy, patient and surgeon satisfaction, and information recall between OVC and F2F patient–surgeon consultation (inception-December 4, 2023).

Results

Out of 1021 studies, 14 studies with 13,564 patients met the eligibility criteria, consisting of seven RCTs, three prospective, and four retrospective studies. Various types of surgical consultations were evaluated, including new referrals, routine follow-ups, postoperative follow-ups, and mixed consultations (both pre- and postoperative). None of the randomized trials exclusively compared OVC with F2F consultations in the high-demand preoperative setting, or assessed patient information recall. Efficacy outcomes were reported by seven studies. Among these, three RCTs showed that OVC improved efficacy in terms of waiting time (8.2 vs. 20.7 min, P = 0.01) and total appointment time (24 vs 71 min, P = 0.001, and 21.9 vs. 154.8 min, P = 0.001). Patient satisfaction was reported by 10 studies. Regarding patient satisfaction, one “mixed design” study favoured OVC (92% vs. 63%, P = 0.04), while eight studies reported similar outcomes.

Conclusions

This systematic review identified some benefits of OVC such as shorter waiting and total appointment times as compared to F2F patient–surgeon consultation, although the true value of OVC remains unknown due to the limited available evidence. Future pragmatic RCTs are needed, which should include the pre-surgical consultation and assess patient information recall.
Modelling of precipitate hardening in ferroelectric materials
Authors: Bohnen Matthias , Müller Ralf , Gross Dietmar
Published: November 2024

This investigation presents a mechanical model to determine energetically favourable particle shapes, motivated by precipitation hardening in ferroelectric materials. We examine Li-doped $$\text {NaNbO}_3$$

NaNbO
3

and propose a system of equations to derive the correct material constants for this material system. To model the elongated precipitate shape we introduce two approaches: An elliptic shape and a shape based on cubic B-spline-curves. We subject both definitions to an optimisation routine that yields equilibrium shapes. We further use the spline approach to derive configurational forces on the interface.
Middle Paleocene to early Eocene sedimentological evolution of the central-eastern Sirt Basin (Libya): biostratigraphy and depositional environment
Authors: Vršič Aleš , Kallanxhi Mădălina-Elena , Baliniak Weronika , Gawlick Hans-Jürgen , Machaniec Elżbieta , Gharsalla Mohammed
Published: November 2024

The depositional history of the central-eastern Sirt Basin of Libya during the Middle Paleocene to Early Eocene is characterised by the deposition of shallow-marine carbonates and hemipelagic claystone and marlstone. To gain a better understanding of the depositional history during this period, we dated the hemipelagic marlstones using planktonic foraminifera and calcareous nannoplankton to refine the stratigraphic relationships with the intercalated shallow-marine limestones. During the Danian, a broad carbonate shelf formed in the eastern sector of the basin. Transgression in the Early Selandian resulted in the deposition of claystones and limestones. The shallow-marine carbonate factory recovered rapidly during the Early-Middle Selandian, forming the Upper Sabil carbonate ramp, however, it became subaerially exposed and eroded in the shallowest areas. The resulting domal structures represent carbonate ramp erosional relics as demonstrated by biostratigraphic results combined with microfacies studies. Whereas in the deeper-water areas of the Upper Sabil carbonate ramp, the deposition was probably continuous throughout the Paleocene–Eocene, the shallow-marine limestones were exposed for about 6 Ma until they were drowned in the Early Eocene. A distinct argillaceous unit, with intercalated shallow-marine limestone beds, was deposited in the basinal areas between the domal structures during the Late Selandian–Thanetian stages. In this study, we define this deposits as the Intisar Formation. The overlying Late Paleocene/Eocene Harash Formation consists of shallow-marine limestones. This trangressive unit infilled the Upper Sabil paleotopography with a 2.5 Ma stratigraphic gap. The hemipelagic marlstone of the Kheir Formation was deposited above the Harash Formation and partly above the Upper Sabil paleotopography during the Ypresian, driven by the major sea-level rise following the Eocene Thermal Maximum-2 (ETM-2). Therefore, a substantial stratigraphic gap of at least 6 Ma is documented on the crest of the domal structures, which were subsequently overlain by the Kheir Formation.

Graphical abstract
Is MAGEC X better than earlier designs of magnetically controlled growing rod: an explant study
Authors: Joyce Thomas J. , Kandemir Goksu , Fender David , Bowey Andrew J. , Rushton Paul R. P.
Published: November 2024

Purpose

Determine the performance of MAGEC X rods through retrieval analysis and comparison with clinical data.

Methods

A multicentre explant database was searched to identify cases using MAGEC X device. Clinical and surgical data was gathered prospectively. Prior to rod disassembly, rods underwent testing with an external remote controller to measure the force output.

Results

Eleven cases from 6 centres were identified. Implantation occurred at mean age 6.9 years with mean duration of implantation 42 months. Dual rod constructs were used in all but one case, providing 21 MAGEC X rods for explant analysis. Tissue metallosis was identified at revision surgery in 8/11 cases (73%). Of the 21 rods, 13/21 (62%) produced no force while 8/21 (38%) produced the force stated by the manufacturer. Endcap separation was seen in 5/21 (24%) rods. Where full disassembly was possible, 13/14 (93%) rods had an intact locking pin. Average rod growth was 18 mm (range 2–45 mm), equivalent to 5.1 mm per year. Wear debris was found within 20/21 (95%) MAGEC X rods.

Conclusion

Despite the substantial design changes with MAGEC X tissue metallosis was seen in most cases; most explanted MAGEC X rods had lengthened only partially and produced no force output. While the previous issue of locking pin fracture appears to have been mitigated with MAGEC X, there are multiple other and new failure modes, such as endcap separation. Overall MAGEC X appears to give little improvement over earlier iterations of the rod.