bluuebunny/crossref_metadata_2025 huggingface dataset:
Barriers and Facilitators Toward Disaster Knowledge, Skills, and Preparedness among Emergency Medical Services in Saudi Arabia
Authors: Almukhlifi Yasir , Crowfoot Gary , Hutton Alison
Published: December 2024

Introduction:

Disasters pose significant challenges globally, affecting millions of people annually. In Saudi Arabia, floods constitute a prevalent natural disaster, underscoring the necessity for effective disaster preparedness among Emergency Medical Services (EMS) workers. Despite their critical role in disaster response, research on disaster preparedness among EMS workers in Saudi Arabia is limited.

Study Objective/Methods:

The study aimed to explore the disaster preparedness among EMS workers in Saudi Arabia. This study applied an explanatory sequential mixed-methods design to explore disaster preparedness among EMS workers in Saudi Arabia, focusing on the qualitative phase. Semi-structured interviews were conducted with 15 EMS workers from National Guard Health Affairs (NGHA) and Ministry of Health (MOH) facilities in Riyadh, Dammam, and Jeddah. Thematic analysis was conducted following Braun and Clarke’s six-step process, ensuring data rigor through Schwandt, et al’s criteria for trustworthiness.

Findings:

The demographic characteristics of participants revealed a predominantly young, male workforce with varying levels of experience and educational backgrounds. Thematic analysis identified three key themes: (1) Newly/developed profession, highlighting the challenges faced by young EMS workers in acquiring disaster preparedness; (2) Access to opportunities and workplace resources (government versus military), indicating discrepancies in disaster preparedness support between government and military hospitals; and (3) Workplace policies and procedures, highlighting the need for clearer disaster policies, training opportunities, and role clarity among EMS workers.

Conclusion:

The study underscores the importance of addressing the unique challenges faced by EMS workers in Saudi Arabia to enhance disaster preparedness. Recommendations include targeted support for young EMS professionals, standardization of disaster training across health care facilities, and improved communication of disaster policies and procedures. These findings have implications for policy and practice in disaster management and EMS training in Saudi Arabia.
Changes in the home language environments of US Spanish–English bilinguals between the ages of 4 and 12
Authors: Albudoor Nahar , Anaya Jissel B. , Peña Elizabeth D. , Bedore Lisa M.
Published: December 2024

This study longitudinally modeled home language exposure patterns of US Spanish–English bilingual children between the ages of 4 and 12. Participants were 280 Spanish–English bilinguals (95% Hispanic, 52% female) who were followed for up to 5 years using a cross-sequential longitudinal design. Multilevel linear regression models were used to estimate language exposure trajectories across four home language sources (adults, peers, electronic media and literacy activities) and three language modes (Spanish-only, English-only and bilingual). Results demonstrated that Spanish interactions with both adults and peers declined as children aged, while bilingual interactions showed a distinct increase over time. Conversely, media exposure and engagement in literacy activities increased over time, irrespective of the language used. Children’s age of first English exposure and current school English exposure also influenced language contact and use in the home. These findings approximate an 8-year exposure trajectory across a continuum of bilingual experiences.
Language exposure and use in study abroad versus migration contexts: modelling activity and learner profiles with ESM data
Authors: Arndt Henriette , Granfeldt Jonas , Gullberg Marianne
Published: December 2024

Language exposure and use (LEU) are widely viewed as key factors in multilingual development, and research highlights the importance of considering not just the frequency and quantity of LEU, but also contextual factors such as when and where a language is used, with whom and why. In this study, we illustrate the complexity of LEU in two contexts (study abroad and migration) by applying sequential mixture modelling to rich Experience Sampling Method data, considering combinations of various aspects of LEU such as language choice, type of activity, quantity, interlocutor characteristics and learner engagement. We argue that together, these methods for data collection and analysis have the potential to significantly strengthen research into LEU and broader language-related development. By uncovering distinct classes of language-related activities and language user profiles, we gain deeper insight into the nature of situated LEU and its relationship to language development among migrants and in study abroad.
Sorting it out: perceptions of foods among newly arrived adolescent refugees in the Southeastern USA
Authors: Jones-Antwi Rebecca E , Owens Caroline , Hadley Craig , Cunningham Solveig A
Published: December 2024

Objective:

To explore the meanings that newly arrived refugee adolescents residing in the Southeastern USA attribute to foods.

Design:

We used methods from cognitive anthropology to assess whether adolescents from different countries share a cultural model of eating behaviours.

Setting:

A school-based study in a community in the Southeastern USA.

Participants:

Adolescents (10–17 years) who arrived in the USA on a refugee visa in the previous year.

Results:

Adolescents showed consensus in grouping items and in identifying some foods as associated with adults and others with children. There was evidence of a shared model of eating practices across age, gender and number of siblings. Adolescents who had lived in a refugee camp were significantly different in how they grouped items.

Conclusions:

Adolescents from nine countries shared a model of eating behaviours; these patterns are consistent with rapid dietary acculturation within 1 year of arrival or with shared models held from pre-arrival. Our finding that adolescents who recently arrived in the USA generally agree about how foods relate to one another holds promise for generalised nutrition and dietary interventions across diverse adolescent groups.
Challenging the hijab ban in India: plural embodiment and secular constitutionalism
Authors: Kannabiran Tella Keertana
Published: December 2024

This paper examines the core twin concepts of secularism and pluralism and their location within the Indian constitutional discourse, through a discussion of the hijab ban in the South Indian state of Karnataka. I suggest that attempts at Hindu majoritarian subversion of these core principles face challenges due to the structure of the Indian Constitution, and due to the constitutional agency and mutinies set in motion by women through their legal challenge of state action. I discuss the hijab ban in India and the two judgments on the ban as an example of this attempted subversion but also of its failure, suggesting that these judgments fall short in their reading of this interrelationship between secularism and pluralism. In doing so, I introduce a threefold analytical categorisation, pluralist constitutionalism, constitutional appropriation and constitutional derailment, to help us outline the tensions inherent in constitutional politics in the present.
Enhanced Charging and Mobilization of Photoemitting Dust Particles in a Low‐Density Plasma
Authors: Richmond Josef L. , Pagán Muñoz José H. , Wang Xu , Horányi Mihály , Machacek Joshua R. , Charles Christine , Boswell Roderick W.
Published: December 2024

We present the first observations of dust charging and mobilization in a combined vacuum ultraviolet (VUV) and plasma environment. It is experimentally demonstrated that exposing photoemitting dust particles to a low‐density plasma enhanced the charge on the particles, accompanied by a significant increase in dust mobilization compared to VUV or plasma exposure alone. Measurements of the dust charge support a proposed ‘charge pumping’ mechanism, in which ambient electrons are collected by photoemitting dust surfaces, causing more photoelectrons to be pumped onto surrounding dust particles, increasing repulsive forces and leading to enhanced mobilization.
Observations of Estuarine Salt Intrusion Dynamics During a Prolonged Drought Event in the Rhine‐Meuse Delta
Authors: Wegman Tess M. , Pietrzak Julie D. , Horner‐Devine Alexander R. , Dijkstra Henk A. , Ralston David K.
Published: December 2024

Salt intrusion poses a global threat to estuaries and deltas, exacerbated by climate change, drought, and sea level rise. This observational study investigates the impact of river discharge, wind, and tidal variations on salt intrusion in a branching river delta during drought. The complexity and spatial extent of deltas make comprehensive measurements challenging and rare. In this paper, we present a 17‐week data set of a historic drought in the Rhine‐Meuse Delta, capturing dynamics in a multiple‐channel system in a wide range of conditions. Key characteristics of this low‐lying delta are its branching channel network and complicated, human‐controlled discharge. Despite the system's complexity, we found that the subtidal salt intrusion length, defined by the 2 PSU isohaline , follows a power law relationship with Rhine River discharge . Subtidal water level variations contribute to short‐term variations in intrusion length, shifting the limit of salt intrusion upstream and downstream with a distance similar to the tidal excursion length. This can be attributed to the up‐estuary transport of seawater, caused by the estuary adjusting to variations in water levels at its mouth. However, spring‐neap variation in the tidal range does not alter the subtidal salt intrusion length. Side branches exhibit distinct dynamics from the main river, and their most important control is the downstream salinity. We show that treating the side branches separately is crucial to incorporate the highly variable downstream boundary condition, and may apply in other deltas or complex estuaries.
Arctic Sea Ice Prediction Based on Multi‐Scale Graph Modeling With Conservation Laws
Authors: Wei Lan , Freris Nikolaos M.
Published: December 2024

Arctic sea ice prediction is critical for exploring climate change, resource extraction, and shipping route planning. This paper introduces a novel neural network model, Ice Graph Attention neTwork (IceGAT), that is trained to predict sea ice concentration (SIC) from a number of atmospheric, oceanic, and land surface measurements. It is based on two design principles: (a) the complex spatial interactions in weather dynamics are captured via a series of graphs corresponding to different spatial resolutions and (b) the incorporation of the physical conservation laws for moisture and potential vorticity. We devise two main variants with 1 hr and 24 hr temporal resolution and determine the optimal input horizon to be 5 days. IceGAT features leading accuracy (96.7%; +2.4% over the current state‐of‐the‐art) and low inference time (1/4 s, on a single GPU). An online implementation (based on data from ERA5) alongside supplementary videos and our shared code are accessible at: https://lannwei.github.io/IceGAT/.
External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime
Authors: Alinaghi Pouriya , Siebesma A. Pier , Jansson Fredrik , Janssens Martin , Glassmeier Franziska
Published: December 2024

Recent observations of the trade‐wind regions highlight the covariability between cold‐pool properties and mesoscale cloud organization. Given the covariability of organization with cloud cover and albedo, this suggests a potential impact of cold pools on the cloud radiative effect (CRE). To explore this, we use an ensemble of 103 large‐domain, high‐resolution, large‐eddy simulations and investigate how the variability in cold pools is determined by large‐scale external cloud‐controlling factors and shaped by processes within the mesoscale. It is demonstrated that the size and frequency of occurrence of cold pools are strongly influenced by the near‐surface horizontal wind speed and large‐scale subsidence. The temporal evolution of cold pools is strongly correlated with the diurnality in radiation. Even without external variability, we find a strong intermittent behavior in the evolution of cold pools, governed by a complex interplay between cold pools and clouds which expresses itself in the form of shallow squall lines. These squall lines result from precipitating downdrafts, cold pool outflows and the resulting gust fronts, reinforcing parent clouds. Cold pools influence the CRE of trade cumuli, but only when they exist during the day. This emphasizes the importance of the synchronization between cold‐pool events and the diurnal cycle of insolation for the dependence of the CRE on cold pools.
Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers
Authors: Chen Shuai , Ran Lishan , Duvert Clément , Liu Boyi , Zhou Yongli , Yang Xiankun , Yang Qianqian , Li Yuxin , Li Si‐Liang
Published: December 2024

Anthropogenic perturbations have substantially altered riverine carbon cycling worldwide, exerting influences on dissolved carbon dioxide (CO2) and methane (CH4) dynamics at multiple levels. However, the magnitude and role of anthropogenic activities in modulating carbon emissions across entire river networks, as well as the influence of climatic controls, remain largely unresolved. Here, we explore the controlling factors of riverine CO2 and CH4 dynamics across 62 subtropical, monsoon‐influenced streams and rivers through basin‐wide seasonal measurements. We found that land use and aquatic metabolism played significant roles in regulating the spatial and temporal patterns of both gases. Increased nutrient levels and organic matter contributed to higher partial pressure of CO2 (pCO2) and CH4 (pCH4). Dissolved oxygen, stable carbon isotope of dissolved inorganic carbon, the proportion of impervious surface, catchment slope, and river width were the major predictors for pCO2. For pCH4, the major predictors were Chlorophyll a and water temperature, which influence organic matter availability and methanogenesis. Seasonal variations in pCO2 and pCH4 were strongly modulated by hydroclimatic conditions, with temperature markedly regulating river ecosystem metabolism. These findings highlight the likelihood of significant changes in riverine carbon emissions as climate changes and land use patterns evolve, thereby profoundly affecting the global carbon cycle.
TRIM59/RBPJ positive feedback circuit confers gemcitabine resistance in pancreatic cancer by activating the Notch signaling pathway
Authors: Chen Shiyu , He Zhiwei , Cai Kun , Zhang Yan , Zhu Hongyan , Pang Chong , Zhang Jiaqi , Wang Dong , Xu Xundi
Published: December 2024

Pancreatic cancer (PC) is one of the most lethal malignant tumors that lacks effective treatment, and gemcitabine-based chemoresistance occurs frequently. Therefore, new therapeutic strategies for PC are urgently needed. Tripartite motif containing 59 (TRIM59) plays an important role in breast and lung cancer chemoresistance. However, the association between TRIM59 and gemcitabine resistance in PC remains unclear. We identified TRIM59 as an innovative E3 ubiquitin ligase that activated Notch signaling in PC. TRIM59 levels were increased in PC and positively correlated with poor prognosis and gemcitabine resistance in PC patients. TRIM59 facilitated gemcitabine resistance in PC cells in vitro and in vivo. TRIM59 interacted with recombination signal binding protein for immunoglobulin kappa J region (RBPJ) and stabilized it by promoting K63-linked ubiquitination. RBPJ transcriptionally upregulated TRIM59 expression, forming a positive feedback loop with TRIM59. We identified a novel TRIM59 inhibitor, catechin, and confirmed that it sensitized PC cells to gemcitabine. TRIM59 conferred gemcitabine resistance in PC by promoting RBPJ K63-linked ubiquitination, followed by activating Notch signaling. Therefore, our study provides a promising target for gemcitabine sensitization in PC treatment.
Contrasting rule and machine learning based digital self triage systems in the USA
Authors: Naved Bilal A. , Luo Yuan
Published: December 2024

Patient smart access and self-triage systems have been in development for decades. As of now, no LLM for processing self-reported patient data has been published by health systems. Many expert systems and computational models have been released to millions. This review is the first to summarize progress in the field including an analysis of the exact self-triage solutions available on the websites of 647 health systems in the USA.
Exploration of a one-dimensional iron-based coordination polymer for enhanced lithium storage capabilities
Authors: Liu Jingwei , Cheng Xiaolong , Dang Shifa , Kong Weile , Zheng Mengxian , Zhang Lei , Wu Shuangyan , Liu Ning , Cao Jinchao
Published: December 2024

The three-dimensional supramolecular structure formed by hydrogen bonds in the Fe-1D anode not only provides favorable pathways for lithium ions but also facilitates electron transfer.
Evidence of strong O–H⋯C interactions involving apical pyramidane carbon atoms as hydrogen atom acceptors
Authors: Veljković Ivana S. , Malinić Miroslavka , Veljković Dušan Ž.
Published: December 2024

Quantum chemical calculations reveal unexpectedly strong O–H⋯C hydrogen bonds between apical carbon atoms of pyramidane and its derivatives and hydrogen atoms of water molecules. The results were supported by analysis of crystal structures.
A computational study of the ternary mixtures of NaPF6–EC and choline glycine ionic liquid
Authors: Fileti Eudes Eterno , Voroshylova Iuliia V. , D. S. Cordeiro M. Natália , Malaspina Thaciana
Published: December 2024

This study investigates the structural and dynamic properties of ternary mixtures composed of NaPF6, ethylene carbonate (EC), and the ionic liquid choline glycine (ChGly), with a focus on their potential as electrolytes for supercapacitors.
Higher BTEX aromatic yield from ethanol over desilicated H,Zn-[Al]ZSM-5 catalysts
Authors: Dittmann Daniel , Ileri Alime , Strassheim Dennis , Dyballa Michael
Published: December 2024

The amount of BTEX aromatics obtained from the conversion of ethanol (ETA) is increased by combining ZSM-5 catalysts having optimum acidity with desilication and zinc ion exchange.
An examination of dimethyl oxalate hydrogenation to methyl glycolate on silica-supported Ni–Co alloy catalysts
Authors: Xiao Donghui , Xie Shilong , Gao Xin , Zhang Riguang , Chang Chun-Ran
Published: December 2024

The selective hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG) is becoming increasingly attractive for the industrial production of polyglycolic acid (PGA) biodegradable plastics.
Highly efficient and recyclable acid catalysis using high-temperature resistant O/W emulsion stabilized by dodecyl phosphonic acid
Authors: Cai Ruizhao , Jiao Jiao , Li Yang , Yang Lulu , Tang Yuhai , Wu Jiale , Cai Shuangshuang , Abbas Ansar , Zhang Minghui , Xu Silong
Published: December 2024

This study developed a pH-responsive O/W emulsion stabilized by dodecyl phosphonic acid (DPA). The system exhibits high-temperature resistance, tunable oil-droplet size, enhanced Knoevenagel reaction efficiency, and catalyst recycling via pH control.
Mo(0) carbonyl complexes bearing the bis(3,5-dimethylpyrazole) ligand: catalysis of the regioselective [2 + 2 + 2] cycloaddition of terminal alkynes to synthesize 1,3,5-isomers
Authors: Mondal Palash , Dutta Poulami , Mani Ganesan
Published: December 2024

New binuclear and metalloligand Mo(0) complexes were synthesized. The latter complex catalyzes the [2 + 2 + 2] cycloaddition of a series of terminal alkynes including those with OH to give uncommon 1,3,5-isomers in a high regioselectivity ratio.
A 1.6 mW cm−2 lactate/O2 enzymatic biofuel cell: enhanced power generation and energy harvesting from human sweat by 3D interpenetrating network porous structure CNT-membranes
Authors: Liu Hao , Lu Yang , Xiang Andrew , Zhang Weili , Kuang Wenmin , Yan Shuaishuai , Cao Qingbin , Zhou Pan , Hou Wenhui , Liu Fengxiang , Zhou Haiyu , Song Xuan , Luo Zhenjun , Chao Baichong , Xiang Yong , Liu Kai
Published: December 2024

A lactate/O2 enzymatic biofuel cell with a power density of 1.6 mW cm−2 enhanced energy generation and harvesting from human sweat using 3D interpenetrating network porous CNT-membranes for continuous monitoring of human health and vital signs.
Mitigating matrix effects in oil and gas wastewater analysis: LC-MS/MS method for ethanolamines
Authors: de Vera Glen Andrew D. , Caldiero Loredana , Conte Giovanni , Plata Desirée L.
Published: December 2024

This study developed a robust LCMS method for accurate quantification of ethanolamines in oil and gas wastewaters, addressing matrix interferences with solid-phase extraction and compound-specific isotopes, enhancing risk evaluation of chemical release to the environment.
A dual-stage purge–trap protocol to separate species-specific mercury from marine biota for precise isotopic analysis
Authors: Li Songjing , Sun Ruoyu , Chen Xiaowei , Zhang Wei , Meng Mei , Liu Yi , Zheng Wang , Chen Jiubin
Published: December 2024

An efficient protocol for separating inorganic mercury and methylmercury from marine biota for high-precision isotopic analysis.
A fluidic device for continuous on-line inductive sensing of proteolytic cleavages
Authors: Li Fan , Sieben Leif , Büchler Johannes , Strahm Manuel , Poc Pascal , Vizovišek Matej , Christiansen Michael G. , Schuerle Simone
Published: December 2024

We describe a biosensor for proteolytic cleavage combining tailored fluidic chips with a pulsed-field magnetometer integrated into printed circuit boards.
A novel electrochemical sensor based on N,P-doped porous carbon materials derived from covalent organic frameworks for highly sensitive determination of 4-aminophenol and acetaminophen
Authors: Wang Mingyue , Guo Hao , Peng Liping , Hui Yingfei , Yan Ruixue , Yang Wu
Published: December 2024

A phosphoronitrile-based COF (HP-COF) was employed as the precursor to acquire N,P-doped porous carbon materials by carbonization. A novel electrochemical sensor HP-COF-C-600/CS/GCE could detect ACOP and 4-AP simultaneously and sensitively.
Enhanced hydrogen production from methanol–water solutions via photocatalysis using lead–cerium co-doped TiO2 with abundant oxygen vacancies
Authors: Hao Zhongming , Duo Xinghong
Published: December 2024

This study investigates the photocatalytic performance of TiO2-based catalysts doped with Pb and Ce, focusing on their structural and electronic properties under AM 1.5G light conditions.
High-performance van der Waals stacked transistors based on ultrathin GaPS4 dielectrics
Authors: Xiao Zhilin , Zeng Binghuan , Xu Fang , Liu Guangjian , Zhou Hua , Chen Jiaqi , Fei Linfeng , Liao Xiaxia , Yuan Jiaren , Zhou Yangbo
Published: December 2024

The layered wide bandgap semiconductor gallium thiophosphate can be applied as a gate dielectric to achieve high-performance Van der Waals field-effect transistors.
Phonon thermal transport in Bi2Te3/Sb2Te3 monolayer superlattices: a neural network potential study
Authors: Zhang Pan , Lyu Fang , Jin Dan , Zhang Zhenhua , Chen Shiwei , Liu Yong , Wang Ziyu , Lu Zhihong , Liang Shiheng , Xiong Rui
Published: December 2024

The decrease of thermal conductivity in coherent short-period Bi2Te3/Sb2Te3 monolayer superlattices is attributed to the variation of phonon scattering behaviors, rather than the decrease in phonon group velocity, which is contrary to expectations.
Sunflower oil-based thermosets via the Passerini three-component reaction
Authors: Santos Correa Luis , Leidenheimer Silas , Meier Michael A. R.
Published: December 2024

A new and efficient method to prepare renewable and circular thermosets showing possible application as glues, based on the Passerini three component reaction, is described.
Surmounting the instability of atomically precise metal nanoclusters towards boosted photoredox organic transformation
Authors: Li Yu-Bing , Xiao Fang-Xing
Published: December 2024

Self-transformation of atomically precise metal nanoclusters into metal nanocrystals is utilized to surmount the intrinsic instability of metal nanoclusters for photoactivity enhancement.
Rapid and automated interpretation of CRISPR-Cas13-based lateral flow assay test results using machine learning
Authors: Xue Mengyuan , Gonzalez Diego H. , Osikpa Emmanuel , Gao Xue , Lillehoj Peter B.
Published: December 2024

We present two machine learning models for rapid and automated interpretation of smartphone-captured images of a CRISPR-Cas13-based lateral flow assay for the detection of the SARS-CoV-2 N gene, which classified the test results with 96.5% accuracy.
The nuclear lamin network passively responds to both active or passive cell movement through confinements
Authors: Amiri Sirine , Bos Inge , Reyssat Etienne , Sykes Cécile
Published: December 2024

As a cell migrates in a constricted environment, its nucleus is strongly deformed in the bottleneck. The lamin envelope, tracked experimentally using fluorescence, behaves as a passive elastic shell. Bar, 10 μm.
Mono‐disperse submicron silver powder for conductive elastomer
Authors: Pi Hemu , Zhao Panchao , Lei Chi , Zhang Bosheng , Wang Xiaoyu , Cao Qigao
Published: December 2024

The synthesis of superfine silver powder with good dispersity is of great significance for accelerating the development of high‐end electronics and photovoltaic products. Herein, a kind of quasi‐spherical submicron silver powder prepared by the introduction of gelatin during silver ions reduction is reported. The optimal scheme is determined that the initial pH of gelatin solution is 3 and the mass of gelatin (Mw 50,000—70,000) is 10% of silver nitrate, leading to a mono‐disperse silver powder with regular morphology and average particle size of 0.5 µm. In addition, the prepared silver powder can be further combined with polydimethylsiloxane (PDMS) to form a stretchable conductive elastomer (PDMS/Ag elastomer). In unstretched state, the minimum sheet resistance of the elastomer can reach 66 Ω/□ without annealing treatment. Even when the elongation reaches 100%, it still exhibits good conductivity with a sheet resistance of only 13 kΩ/□. The comprehensive performance, mainly referring to stretching and conductivity, is comparable to that of some flexible conductive materials involving silver nanowire or nanocarbon. Thus, this study will demonstrate a new class of silver powder with a potential in flexible electronics.
Resultados comparativos en cirugía del túnel carpiano bilateral en 1 y 2 etapas
Authors: Cifuentes Natalia , Naranjo Marco , Sanhueza Miguel , Carrasco Gabriel , González Javier , Henríquez Luis , Barrios Dangelo , Cavalla Pedro , San Martín Javiera
Published: December 2024

Introducción Síndrome túnel carpiano (STC) es la neuropatía por atrapamiento más frecuente, correspondiendo 3-5%1 50-70% es bilateral.2 Se cree que intervenir simultáneamente en 1 tiempo se asocia a mayor disconfort que en 2 tiempos, se asocia a elevado gasto tanto para el paciente como para los sistemas de salud.3

Hipótesis Tratamiento quirúrgico en 1 tiempo es bien tolerado, con tiempo de evolución postoperatorio similar y menor costo.

Métodos Estudio retrospectivo de cohorte. Revisión archivos de STC bilateral operados en 1 y 2 tiempos en 1 centro, por el mismo equipo entre 2019-2022, seguimiento 2 y 41 meses. Técnica abierta intertenar.

Evaluó: ausentismo laboral, Quick Dash, satisfacción y costos. Consideró ingreso promedio en Chile publicado por Instituto Nacional Estadísticas (INE) 2020 para valorización día laboral perdido (DTP).

Resultados 538 cirugías se rescataron 118:

Grupo A: intervención bilateral en 1 tiempo. 26 pacientes. Edad promedio 49.

Grupo B: intervención bilateral en 2 tiempos. 33 pacientes. Edad promedio 49.

Quick DASH grupo A v/s B promedio 1.74 v/s 3.23 valor p 0.47. DTP 32.88 v/s 84.84; valor p 0.00014. Satisfacción 88% v/s 91%, p 0.69. Gasto incurrido quirúrgico fue, 4979.37 US v/s 5274.63 US

Considerando DTP diferencia fue de US 1503.77

Conclusión Resultado quirúrgico es comparable sin mayor disconfort. Existió diferencia en días laborales perdidos y costos, favoreciendo intervención en 1 tiempo.

Nivel evidencia III
ESR studies of the transition from a spin-glass state to antiferromagnetism in copper–manganese alloys
Authors: Tsapin A. I. , Cherenkov V. A.
Published: December 2024

The boundary concentrations of the spin-glass phase and the phase of short-range antiferromagnetism have been determined in Cu–Mn alloys. A region of an antiasperomagnetic state has been found in the alloys. A qualitative magnetic phase diagram is proposed for Cu–Mn alloys for a wide range of paramagnetic impurity concentrations.
Kinetic properties of aluminum in inhomogeneous magnetic fields
Authors: Gostishchev V. I. , Drozd A. A. , Kuz’min V. S. , Mazurenko O. N. , Khazov V. N.
Published: December 2024

It has been established for the first time that the kinetic properties of aluminum in inhomogeneous magnetic fields (ωHτ > 1) depend on the coordinate across the specimen. The phenomenon is attributed to eddy thermal fluxes and electric currents.
Manifestation of the phonon entrainment of a liquid
Authors: Budde A.
Published: December 2024

We present a theoretical description of the spin echo manifestation of phonon entrainment of a liquid. An analytical expression is found for the spin echo amplitude in the presence of an inhomogeneous current created by phonons passing through a solid partition, and a numerical estimate is presented for the size of the anticipated effect.
Melting diagram of hydrogen–deuterium solutions for pressures up to 100 atm
Authors: Bereznyak N. G. , Sheĭnina A. A.
Published: December 2024

Curves of the onset of melting of hydrogen-deuterium solutions of three different concentrations versus the vapor pressure up to ∼ 140 atm are measured. The topology of the melting diagram of H2–D2 solutions at elevated pressures is determined. The isotope separation coefficients between the liquid and solid phases are calculated.
Direct-current skinning in inhomogeneous bismuth single crystals
Authors: Bogod Yu. A. , Krasovitskii Vit. B. , Lemeshevskaya E. T.
Published: December 2024

It is shown that when single-crystal bismuth specimens that have a homogeneous defect distribution are in a transverse magnetic field the direct electric current is displaced to one of the boundary surfaces. The experimental results are compared with the calculated potential distribution.
Magnetoresistance of ordered (PdxPt1-x)3Fe alloys in fields up to 150 kG
Authors: Kourov N. I. , Tsiovkin Yu. N. , Volkenshtein N. V. , Glin’skii M.
Published: December 2024

The longitudinal (Δρ∥/ρ0) and transverse (Δρ⊥/ρ0) magnetoresistances of atomically ordered (PdxPt1-x)3 Fealloys are studied in magnetic fields of up to 150 kG. The magnetoresistance of the ferromagnetic Pd3Fe is shown to obey the well-known rules for even galvanomagnetic effects. In the antiferromagnetic Pt3Fe the longitudinal and transverse magnetoresistances are positive and are proportional to H3/2 for fields in the range 30 < H < 150 kG at T = 4.2 K. The dependence Δρ⊥/ρ0(H) is explained in terms of the Lorentz mechanism. The Δρ∥/ρ0 effect in the given case is assumed to be due to the curvature of the lines of flux in the specimen because of the inhomogeneity of the specimen or is due to a change in the parameters of the electron spectrum when a strong magnetic field is applied. In the region of the concentration phase transitions, ferromagnetic–paramagnetic at T = 300 K and ferromagnetic–antiferromagnetic at T = 4.2 K, the magnetoresistance is due mainly to a “paraprocess” component which is negative and attains its maximum at the critical concentration xc ∼ 0.5.
Structure of condensed oxygen films
Authors: Kovalenko S. I. , Solodovnik A. A.
Published: December 2024

We have carried out electron diffraction studies of the structure of condensed O2 films at temperatures ranging from 5 K to 32–34 K using samples whose effective thicknesses ranged from 20–30 Å to 400 Å. Analysis of the resulting diffraction patterns established that there are stable film phases characteristic of bulk crystals. It is shown that the “anomalous” α′ phase is due to impurities in the oxygen rather than to a size effect. We have studied the conditions necessary for forming an amorphous phase and a high-temperature version of γ-O2 that is metastable over a specific temperature range.
Temperature dependence of superradiance intensity in pyrene-doped diphenyl crystals
Authors: Zinov’ev P. V. , Malyukin Yu. V. , Naboikin Yu. V. , Silaeva N. B.
Published: December 2024

For the first time the temperature dependence of the superradiance intensity in a solid, a diphenyl molecular crystal doped with pyrene, has been obtained, in the temperature range from 1.5 to 4.2 K. The results obtained provide further confirmation of the existence of a superradiant state in this crystal. A probable mechanism is proposed to explain the experimental results.
Some features of the highly conductive state in the solid phase of sodium–ammonia solutions
Authors: Vasil’chenko S. A. , Dmitrenko I. M. , Moshenskii A. A.
Published: December 2024

The phenomenon of switching in the solid phase of sodium–ammonia solutions is observed to occur over a wider range of metal concentrations than in the liquid phase. Regardless of the metal concentration solutions in the highly conductive state have roughly the same resistance. At currents close to those which destroy the highly conductive state we observed a second switching which is probably associated with the formation of a highly conductive channel.
Thermal conductivity of solid NH3 and ND3▪ Discovery and investigation of libron heat transport
Authors: Kokshenev V. B. , Kravchenko Yu. G. , Krupskiĩ I. N.
Published: December 2024

Results are presented of an experimental and theoretical study of the features of heat transport in solid NH3 and ND3 in the premelting temperature region. It was found that the thermal conductivity of ND3 near the triple point, as distinct from NH3, does not fall as the temperature rises, but increases. It was established that the observed anomaly is brought about by a contribution from libron modes to heat transport, associated with rotation of the molecules about the threefold axes. A theoretical analysis has been carried out of the collision processes of quasiparticles which lead to the anomalous λ(T) dependence. It is shown that the increase in thermal conductivity of ND3 is produced by a rapid softening of the libron branches carrying heat, which leads to a reduction near Ttr of the probability of phonon–libron interactions. The apparatus and the method of studying the thermal conductivity of cryocrystals in the premelting temperature region are described.
Magnetic resonance in the intermediate state of CuCI2 · 2H2O
Authors: Eremenko V. V. , Klochko A. V. , Naumenko V. M. , Pishko V. V.
Published: December 2024

Experimental observations have shown that when an external magnetic field is oriented exactly along the “easy” axis of a CuCl2 · 2H2O crystal the frequency-field dependences of the antiferromagnetic resonance lines and the exchange modes have discontinuities in the vicinity of the spin-flip field of the magnetic sublattices. This establishes the existence of an intermediate state in the crystal.
Two condensates in superfluid Bose systems
Authors: Shevchenko S. I.
Published: December 2024

A well-known paradox in the theory of superfluidity is studied: superfluidity is linked to Bose condensation, but the superfluid density is always greater than the density of the Bose condensate. Based on the model of a weakly nonideal Bose gas, it is demonstrated that supercondensate particles, forming pairs which are correlated in momentum space—the two-particle condensate—make the missing contribution to the superfluid density. It is shown that in the case of slow spatial variations of superfluid flows it is possible to introduce a macroscopic wave function describing the entire superfluid component and not only the single-particle condensate. The characteristic features of weak superfluidity in Bose systems are studied and it is shown that the tunneling effect is a sensitive tool for studying the structure of the superfluid component. It is hypothesized that the superfluid component of real He II consists of the sum of one-, two-, three-, and many-particle condensates.
Theory of the β–γ transition in solid oxygen
Authors: Brodyanskii A. P. , Freiman Yu. A.
Published: December 2024

We consider a model of “discs and spheres” as a description of γ-O2, in which the nutational motion of the precessing molecules is described in terms of a quantum approach, while the remaining orientational degrees of freedom are described classically. Using a modified Kohin potential, we calculate the constants of the molecular and crystalline fields for the precessing molecules in γ-O2, and we show that their orientational state may be described by a negative value of the order parameter. It is shown that the β-γ transition in solid oxygen is related to a change in sign of the order parameter in the orientational subsystem and may be reduced to a transition of the order–order type.
Phase transition in a system with a strong electron–phonon interaction
Authors: Vol E. D.
Published: December 2024

We have studied the bound state of a conduction electron and the optical vibrations in an ionic crystal. Using a variational method we have obtained analytic expressions for the ground state energy and for the effective mass for the case of an arbitrarily large electron–phonon coupling constant α. We have shown that in the range of values 6.6 < α <9.7 there is a rearrangement of the ground state. For 6.6 > α the ground state is delocalized. For 6.6<α <9.7 the localized and delocalized states coexist, but the delocalized state lies at lower energy. For α > 9.7 the localized state lies lower. We briefly discuss the possibility for experimental observation of transitions between the free and self-localized states.
Kinetic effects in a system of low electron density on the free surface of liquid helium
Authors: Tatarskii V. V.
Published: December 2024

The influence of a finite electron density on the linewidth of cyclotron resonance is considered under the conditions of low density. The finite electron density ns is shown to cause a qualitative change in the dependence of the cyclotron resonance linewidth on the magnitude of the clamping field in the case of total screening. At the same time, the temperature dependence of the cyclotron resonance linewidth is affected only weakly when the finite electron density is taken into account.
Relaxation of the modulus of the order parameter Δ for T > T
c and the nonstationary proximity effect
Authors: Chefranov S. G.
Published: December 2024

New branches of the diffusion mode Δ, determined by a discrete set of characteristic relaxation times τn≃1/2π[T(2n + 1)]−1(n = 0,1,2,...) and the coefficient of diffusion D=(vF2/12πT)ln(4γT/Tc) are obtained for T ≫ Tc/4γ (γ ≈1.78). It is shown that the depth of penetration Δ into the normal pure metal in the presence of the nonstationary proximity effect L ≃ L0(Dτ0)1/2 for such modes can greatly exceed the known stationary value L = vF/2πT.
Nonlinear current–voltage characteristic of a thin metallic wire
Authors: Kaner É. A. , Snapiro I. B. , Yampol’skii V. A.
Published: December 2024

An asymptotically exact theory of the deviation of the IVC from Ohm’s law at low temperatures due to a new mechanism of magnetodynamic nonlinearity is proposed. The effect is associated with the trapping of electrons in a magnetic potential well, created by the intrinsic nonuniform magnetic field generated by the current. It is established that as the current is increased the voltage drop saturates. Numerical estimates demonstrate that the nonlinear IVC can be observed experimentally. An analysis shows that in thin samples, as the current is increased the proposed mechanism is manifested earlier than all other known mechanisms for deviation from Ohm’s law. The experiments of Yaqub and Cochran, performed on pure gallium, confirm the existence of a magnetodynamic nonlinearity.
Vibrational population of molecules of HgBr(B2Σ+,v′) in cryomatrices of xenon and nitrogen
Authors: Samovarov V. N. , Fugol’ I. Ya.
Published: December 2024

It is experimentally observed that in a system of electronically excited molecules of HgBr(B2Σ+,v′), in cryogenic matrices, there may arise an inversion of the populations of the vibrational levels v′. The population of the HgBr(B2Σ+,v′), molecules at high vibrational levels takes place as a result of dissociation of the original impurity molecules of HgBr2 upon excitation of the cryomatrix by an electron beam. The crystal field of the matrix results in the appearance of an additional powerful mechanism for dissociative population of HgBr(B2Σ+,v′) due to the splitting of the 2P3/2 level of the bromine atom, which is a product of the dissociation. The existence of a population inversion suggests an anomalously weak vibrational relaxation of the HgBr(B2Σ+,v′) in the cryogenic matrix.
Isomorphic phase transition in solid n-H2
Authors: Shcherbakov G. N. , Prokhvatilov A. I. , Krupskii I. N.
Published: December 2024

X-ray studies of normal hydrogen at T = 13.6 K reveal a phase transformation with a negative volume jump ΔV = 0.16 cm3/mole, occurring without a change in the hexagonal symmetry of the lattice. It is established that the volume jump is accompanied by an appreciable jump in the ratio of the lattice parameters c/a, which for the high-temperature phase corresponds to close packing of spheres. It is shown that the introduction of krypton impurities into the hydrogen stabilizes the fcc structure near the melting temperature of n-H2.
Study of the intrinsic absorption edge of layered molybdates exhibiting low-temperature phase transitions
Authors: Skorobogatova I. V. , Savchenko E. M. , Radchenko E. D.
Published: December 2024

The intrinsic absorption edge of (AE) of layered single crystals of CsR(MoO4)2 where R is the ion of a rare-earth element or bismuth, is studied at room temperature. A correlation is found between the dependence of the gap width and the dependence of the melting temperature on the interlayer parameter a for a series of these compounds. For single crystals in the system CsDy(Mg1−x Wx O4)2 with x = 0, 0.02, 0.05, 0.1, and 0.2, which undergo first-order low-temperature transitions, the AE is studied above and below the transition temperatures Tc; the mechanism of the phase transition (PT) in CsDy(MoO4)2 has not been finally established. The study performed showed that the interband electron–phonon interaction cannot be the microscopic mechanism for the PT in CsDy(MoO4)2 jumps in the AE, whose magnitude drops as the tungsten concentration CW is increased, while Tc increases, were observed at the PT temperatures. Extrapolarization of the jumps in AE to zero permits obtaining critical values of Tc and CW with which first-order transitions become second-order PT (tricritical point). The energy kTc at this point determines the magnitude of the interaction force leading to the PT. The magnitude of this energy is close to the energy of the change in the interlayer atomic interaction in the compounds studied.
Macroscopic quantum effect due to charge discreteness
Authors: Ivanchenko Yu. M. , Medvedev Yu. V.
Published: December 2024

The incremental capacitance of a system of two small conductors that are in contact over a small area and are connected to a dc source is predicted to have an oscillating, resonant behavior in the quantum limit, when it becomes necessary to take the charge fluctuations into account.
Fermi-liquid effects in a nonequilibrium electron–phonon system
Authors: Omel’yanchuk A. N.
Published: December 2024

The electron–phonon-renormalized effective mass of electrons in the nonequilibrium state, which is realized in metal point contacts, is shown to depend on the contact potential difference eV and to differ considerably from its values in the equilibrium state when eV ∼ hωD (ωD is the Debye frequency). When Fermi-liquid effects are taken into account the inductance of a point contact between normal metals may become negative.
Vortex dynamics in the region of charge imbalance
Authors: Sivakov A. G. , Volotskaya V. G.
Published: December 2024

The nature of vortex flows in the nonequilibrium region arising in the vicinity of phase-slip lines at the S–N boundary are investigated experimentally. It is shown that vortices continue to move when charge imbalance appears in a film that is in a dynamic mixed state. The vortex dynamics in this case is determined by the interaction of the vortices with only the superconducting component of the current. This statement is supported by a study of the dynamic mixed state in the nonequilibrium region near the S–N boundary.
Low-temperature kinetic properties of a two-phase tantalum–hydrogen system
Authors: Ermolaev A. M. , Merisov B. A. , Khadzhai G. Ya.
Published: December 2024

The changes in the thermal and electrical resistivities of a two-phase Ta–H system in comparison with those of the original tantalum are shown to be due to both electron scattering on hydride precipitates and an increase in the number of conduction electrons upon the introduction of hydrogen. A deviation from the Matthiessen rule has been detected in the electrical resistivity of this system.
EPR study of atoms trapped in superfluid helium. II. Spectra of hydrogen and deuterium atoms
Authors: Gordon E. B. , Pel’menev A. A. , Pugachev O. F. , Khmelenko V. V.
Published: December 2024

The first EPR spectra of hydrogen and deuterium atoms trapped in superfluid helium and the results of a study of the transformation of spectra with temperature maintained at T = 1.8 K and heating of samples up to T = 4.2 K are presented. The results of the studies of systems containing both hydrogen and deuterium indicate that exchange reactions occur between atoms and molecules of hydrogen isotopes directly in the solid matrix at temperatures of 1.8–4.2 K.
Measurement of relative neutron energy response curve of plastic scintillator detector based on the back-n-white neutron source at CSNS
Authors: Zhang Yapeng , Ruan Jinlu , Chen Liang , Zhang Jianfu , He Shiyi , Zhao Kuo , Zhou Leidang , Zhang Silong , Zhao Naizhe , Li Yang , Shu Wenyu , Wang Fangbao , Ouyang Xiaoping
Published: December 2024

The plastic scintillator detector is widely used to measure pulsed radiation fields, and a high-quality neutron energy response curve is crucial for accurately determining neutron yields. Traditionally, the neutron energy response curve can be obtained by the simulation of the performance of neutron detectors via the knowledge of the light yield of secondary particles or direct measuring energy response. Both methods record signals by a data acquisition system in the counting mode. This work establishes a new model to directly measure the energy response to neutrons of a plastic scintillator detector in current mode with white source spectra. The plastic scintillator detector can be triggered externally. There is no signal loss and dead time, and it is possible to calibrate the neutron detector with a high-intensity neutron source. Efficiencies can be determined at all energies simultaneously, and a rapid calibration of the plastic scintillator detector is available. To validate the experimental results, the theoretical values are obtained by Geant4 simulation, and the results reproduce the shapes of the experimental curves reasonably well. The neutron energy response curves of the detector show that when the thickness of the scintillator is reduced from 3 to 1 mm, the reduction ratio of gamma signal intensity is greater than that of neutron signal intensity, which leads to an increase in the neutron–gamma sensitivity ratio. Meanwhile, the thin scintillator thickness can obtain a somewhat flatter neutron energy response curve compared with other thicknesses.