bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preoperative femoral vessel variations in hypotension after spinal anesthesia for cesarean section
Authors: Yin Hong , Peng Yuzhu , Zhao Cong , Cai Min , Li Juan , Yi Mingliang 
Published: December 2023

Abstract

BackgroundHypotension is a common side effect of spinal anesthesia during caesarean delivery. To assess the association between preoperative femoral vessel variations and postural hypotension after spinal anesthesia for cesarean section.MethodsParticipants who scheduled to undergo elective cesarean section with spinal anesthesia between November 2020 and June 2021 were included in this prospective study. Hypotension was systolic blood pressure decreased by at least 20% from baseline.ResultsRight femoral artery (RFA) peak flow velocity and the percent variance in the right femoral vein (RFV) in the left lateral decubitus position (LP) were significantly higher in the hypotension group than in the normal blood pressure group (P = 0.04 and P = 0.01). The percent variance in the RFV diameter in the LP (OR = 76.796, P = 0.016), preoperative basal heart rate (OR = 1.043, P = 0.028) were risk factors associated with hypotension during cesarean section, and weight gain during pregnancy (OR = 0.915, P = 0.047) was protective factor associated with hypotension during cesarean section. A cutoff value of 0.059% for the percent variance in the RFV had an AUC of 0.627 (95% CI: 0.508–0.757, P = 0.0045). Another cutoff value of 15.75 kg for weight change during pregnancy had an AUC of 0.617 (95% CI: 0.510–0.724, P = 0.038).ConclusionsThe percent variance in RFV diameter, preoperative basal heart rate and weight gain during pregnancy may be associated with postural hypotension after spinal anesthesia for cesarean section and should pay more attention in the clinical setting.Trial registration:Chinese Clinical Trial Registry (ChiCTR2000040029, 18/11/2020).
Research on Roof Weighting Mechanism of Coal Pillar Mining in Shallow Buried Closely Spaced Multi-seams
Authors: He Yanpeng , Huang Qingxiang , Ma Li , Wang Qingxiong , Fan Donglin 
Published: December 2023

Abstract

In the process of mining the lower working face through the coal pillar (CP) in shallow-buried closely coal seams (SBCCS), noticeable roof step sinking and dynamic load effects on the support were observed. Taking the 22408 working face through the overlying concentrated CP of the Bulianta Coal Mine was selected as the research object. Used the methods of field measurement, physical simulation, and theoretical analysis to master the law of movement of the coal pillar and overlying strata while passing the CP, the structural coupling impact of the key strata structure of the interburden and coal pillar was revealed, which was the main reason for the cutting dynamic load effect during the passing of the CP of the working face. The advanced breaking mechanical model of the coupled roof structure of the "key strata structure of the interburden and the coal pillar" is established, and the main factors affecting the breakthrough distance of the advanced breaking distance are analyzed, and the mechanism of the strong weighting caused by the cutting roof of the working surface is explained at the stage of coal pillar. At the same time, it is obtained that when the width of the CP is 25m, the working face is 20m below the CP, which is the maximum bending moment point of the rock beam, indicating that the position that is prone to break under this width is about 5m of the coal pillar, which aligns with experimental data. The present study provides a theoretical guideline for the location and control of strong ground pressure during CP mining in SBCCS.
Strengthening of Variously Shaped Recycled Aggregate Concrete Columns using Ferrocement Confinement
Authors: Amir Muhammad Talha , Rashid Muhammad Usman , Raza Ali , Sohail Muhammad Rameez , Adil Wajid Ali 
Published: December 2023

Abstract
Except for addressing landfill requirements, incorporating recycled coarse aggregate into concrete development contributes to the creation of environmentally friendly and sustainable infrastructures. Moreover, among the variety of procedures used to reinforce and repair concrete structural elements, ferrocement confinement (FC) is a very adaptable approach. It stands out from many alternative approaches because of its exceptional features, which include affordability, ease of availability, and simplicity in production by common labor. The purpose of this research is to evaluate the effectiveness of incorporating FC into emerging nation construction methods. A detailed investigation was conducted to determine the effects of using FC wrapping on square-reinforced recycled aggregate concrete columns with different cross-sectional areas. Twenty-four carefully cast concrete column specimens in a range of diameters were put to axial compressive loads. Twelve sample were fabricated with recycled aggregate concrete and FC confinement while the other twelve samples were produced as control samples with natural aggerate concrete. The specimens were subsequently divided into four groups, each with a different size but the same slenderness ratio (1:6), to examine the effects of different column diameters on the benefits of ferrocement confinement. The stiffness of FC confined samples was improved by increasing the cross-sectional dimensions of the columns. The strength enhancement factor of confined samples was decreased by increasing the cross-sectional dimensions of the columns. The strength enhancement factor of confined sample 100 x 100 mm size was 2.33 Ks which reduced to 2.14, 2.05, and 1.95 Ks by increasing the side length of columns to 125 mm, 150 mm, and 175 mm, respectively. In addition, a cost-benefit analysis was carried out to emphasize how feasible and urgent it is for the construction sector to implement this technique right away.
Comparative analysis of some laser beams spreading through oceanic turbulence
Authors: Nossir N. , Dalil-Essakali L. , Belafhal A. 
Published: December 2023

Abstract
The purpose of this paper is to explore the evolution behavior of two important laser features: the Bessel higher-order cosh-Gaussian (BHoChG) beam and the Bessel higher-order sinh-Gaussian (BHoShG) beam propagating through turbulent oceanic environments. Benefiting from the extended Huygens-Fresnel principle, the analytical formulas for the average intensity of the beams passing through oceanic turbulence are derived. The propagation of some laser beams through oceanic turbulence is also deduced as particular cases from the present study. The effects of oceanic turbulence parameters and the source beam parameters are examined to understand their influence on the intensity distribution of the considered beams by using numerical simulations. Our results show that the spreading of these beams depends on their initial parameters and oceanic parameters. Hence, the propagation of the studied beams through oceanic turbulent will be faster with the smaller dissipation rate of the mean square temperature, larger salinity fluctuations, higher rate of dissipation of turbulent kinetic energy per unit mass of fluid and with decreasing the beam width and the parameter Ω. The outputs of this study have useful applications in optical underwater communication, remote sensing, imaging and others.
Quantum Image Edge Detection Based on Laplacianof Gaussian Operator
Authors: Yuan Suzhen , Zhao Wenhao , DENG JEREMIAH D. , Xia Shuyin , Li Xianli 
Published: December 2023

Abstract

With the increase in the quantity and quality of images that need to be processed, there are higher requirements for the speed of image processing. Thus, it is necessary to speed-up the image processing algorithms. In this paper, we design a quantum image edge detection algorithm based on Laplacian of Gaussian (LoG) operator, which has significant acceleration due to the quantum parallelism. Firstly, the quantum circuit of the novel enhanced quantum image representation (NEQR) model is improved to represent multiple quantum images simultaneously with lower time complexity. Secondly, the quantum subtractor and quantum comparator are optimized. Thirdly, quantum adder, quantum multiplier, quantum comparator, and quantum subtractor are adopted to design the quantum circuit of LoG operator and zero-crossing detector, which constitute the quantum edge detection algorithm. Finally, the algorithm is simulated on the IBM Quantum Experience (IBM Q) platform to verify its feasibility. Compared with the existing state-of-the-art algorithms, the proposed quantum image edge detection algorithm has significant improvement in time complexity.
A High Efficiency Harmonic Control GaN Power Amplifier
Authors: Lin Qian , Lu Cong , Zhao Pengfei , Wu Feng , Hu Hui 
Published: December 2023

Abstract

In order to meet the requirements of the high efficiency for the wireless communication system, this paper introduces a high efficiency power amplifier (PA) based on the harmonic control technique. Compared with other works, this method can realize the second and third-harmonic impedance matching accurately. Besides, to avoid the problem of transmission line with high characteristic impedance in bias network, the π-typed and L-typed structure is utilized. For demonstration, a high efficient PA using CGH40010 GaN HEMT is designed and fabricated. The measured results show that it obtained an output power (Pout) of 39.5 ± 1 dBm, a Gain of 14.5 ± 1 dB, a maximum drain efficiency (DE) of 74.6% within the frequency range of 0.3–1.75 GHz. After comparison, this PA is superior in terms of efficiency and gain and has predominant engineer application.
Ice slabs thickening drives surface runoff expansion from the Greenland Ice Sheet’s percolation zone
Authors: Jullien Nicolas , Tedstone Andrew , Machguth Horst 
Published: December 2023

Abstract
Firn – an interannual layer made of a seasonal snow – covers the vast majority of the Greenland Ice Sheet. It holds the potential to buffer meltwater runoff contribution to sea level rise by storing it in its porous space. However, the ice sheet has recently experienced record summer melting, favouring the development of several meters thick low-permeability ice slabs when meltwater refreezes in the shallow firn. At the same time, surface runoff from the ice sheet has occurred at increasingly higher elevations. Using runoff limits retrieved from Landsat imagery and ice slab thickness derived from airborne Accumulation Radar onboard NASA’s Operation Ice Bridge, we show that the maximum visible runoff limit is controlled by the structure of the underlying firn. We demonstrate that there is heterogeneity in ice slab thickness which can be explained by lateral meltwater flow in the slush matrix and surface rivers overlying the slab, causing surface meltwater to refreeze some distance downslope of where it melted. Finally, comparing ice slab thickness with ice-sheet-wide Sentinel-1 Synthetic Aperture Radar Horizontal-Vertical polarisation signal strength, we show that the onset of visible meltwater runoff is associated with 2–4 m thick ice slabs, constraining the minimum ice thickness needed to sustain runoff. Our findings therefore provide a basis for making improvements to the parametrization of partitioning between meltwater refreezing and runoff in firn models, in turn reducing uncertainty in future sea level rise.
Usability and Perception of a Wearable-Integrated Digital Maternity Record App in Germany: User Study
Authors: Nissen Michael , Perez Carlos A , Jaeger Katharina M , Bleher Hannah , Flaucher Madeleine , Huebner Hanna , Danzberger Nina , Titzmann Adriana , Pontones Constanza A , Fasching Peter A , Beckmann Matthias W , Eskofier Bjoern M , Leutheuser Heike 
Published: December 2023

Abstract

Background
Although digital maternity records (DMRs) have been evaluated in the past, no previous work investigated usability or acceptance through an observational usability study.

Objective
The primary objective was to assess the usability and perception of a DMR smartphone app for pregnant women. The secondary objective was to assess personal preferences and habits related to online information searching, wearable data presentation and interpretation, at-home examination, and sharing data for research purposes during pregnancy.

Methods
A DMR smartphone app was developed. Key features such as wearable device integration, study functionalities (eg, questionnaires), and common pregnancy app functionalities (eg, mood tracker) were included. Women who had previously given birth were invited to participate. Participants completed 10 tasks while asked to think aloud. Sessions were conducted via Zoom. Video, audio, and the shared screen were recorded for analysis. Task completion times, task success, errors, and self-reported (free text) feedback were evaluated. Usability was measured through the System Usability Scale (SUS) and User Experience Questionnaire (UEQ). Semistructured interviews were conducted to explore the secondary objective.

Results
A total of 11 participants (mean age 34.6, SD 2.2 years) were included in the study. A mean SUS score of 79.09 (SD 18.38) was achieved. The app was rated “above average” in 4 of 6 UEQ categories. Sixteen unique features were requested. We found that 5 of 11 participants would only use wearables during pregnancy if requested to by their physician, while 10 of 11 stated they would share their data for research purposes.

Conclusions
Pregnant women rely on their medical caregivers for advice, including on the use of mobile and ubiquitous health technology. Clear benefits must be communicated if issuing wearable devices to pregnant women. Participants that experienced pregnancy complications in the past were overall more open toward the use of wearable devices in pregnancy. Pregnant women have different opinions regarding access to, interpretation of, and reactions to alerts based on wearable data. Future work should investigate personalized concepts covering these aspects.
Editorial
Authors: Editorial Consejo 
Published: December 2023

La Revista Electrónica “REINED” es una publicación semestral de carácter científico, desarrollada por académicos y profesionales de la Facultad de Educación y Humanidades de la Universidad del Bío-Bío, a disposición de los Docentes, Investigadores, Profesionales y Estudiantes de la comunidad nacional e internacional interesados en el área educativa.
Su objetivo es generar un espacio para la difusión de trabajos de investigación y reflexión académica de los y las estudiantes de postgrado, académico/as y estudiantes de pregrado de las carreras de la Facultad de Educación y Humanidades de la Universidad del Bío-Bío, así como de investigadores de otras instituciones y profesores de establecimientos educacionales.
PENGARUH AKSES PERMODALAN, STRATEGI PEMASARAN DAN INOVASI PRODUK TERHADAP KINERJA USAHA KONVEKSI DI KOTA BANDA ACEH
Authors: Marzana Syadza Khaula , Amri Khairul , Amanatillah Dara 
Published: December 2023

AbstrakPenelitian ini bertujuan untuk menganalisis pengaruh akses permodalan, strategi pemasaran dan inovasi produk terhadap kinerja usaha konveksi di kota Banda Aceh. Sampel penelitian sebanyak 59 orang pelaku usaha tersebut yang menjalankan usahanya di desa Kampung Baru sebagai pusat usaha konveksi di kota Banda Aceh. Pengumpulan data menggunakan kuesioner dan selanjutnya data dianalisis dengan peralatan statistik regresi linier berganda. Penelitian ini mengungkapkan bahwa akses permodalan, strategi pemasaran dan inovasi produk secara signifikan dapat meningkatkan kinerja usaha konveksi. Semakin mudah akses pelaku usaha ke sumber modal eksternal, semakin baik strategi pemasaran yang diterapkan semakin baik kinerja usaha. Demikian pula halnya dengan inovasi produk, pelaku usaha yang inovatif memiliki kinerja usaha yang lebih baik dibanding mereka yang kurang inovatif. Karena itu, peningkatan akses pada sumber permodalan, perbaikan kemampuan pelaku usaha dalam menerapkan strategi pemasaran dan melakukan inovasi produk/jasa yang ditawarkan dapat menjadi kebijakan rekomendatif bagi instansi terkait di kota Banda Aceh.
Comparative responses of flocculating and nonflocculating yeasts to cell density and chemical stress in lactic acid fermentation
Authors: Pangestu Radityo , Kahar Prihardi , Ogino Chiaki , Kondo Akihiko 
Published: December 2023

While flocculation has demonstrated its efficacy in enhancing yeast
robustness and ethanol production, its potential application for lactic
acid fermentation remains largely unexplored. Our study examined the
differences between flocculating and nonflocculating Saccharomyces
cerevisiae strains in terms of their metabolic dynamics when
incorporating an exogenous lactic acid pathway, across varying cell
densities and in the presence of lignocellulose-derived byproducts.
Comparative gene expression profiles revealed that cultivating a
nonflocculant strain at higher cell density yielded a substantial
upregulation of genes associated with glycolysis, energy metabolism, and
other key pathways, resulting in elevated levels of fermentation
products. Meanwhile, the flocculating strain displayed an inherent
ability to sustain high glycolytic activity regardless of the cell
density. Moreover, our investigation revealed a significant reduction in
glycolytic activity under chemical stress, potentially attributable to
diminished ATP supply during the energy investment phase. Conversely,
the formation of flocs in the flocculating strain conferred protection
against toxic chemicals present in the medium, fostering more stable
lactic acid production levels. Additionally, the distinct flocculation
traits observed between the two examined strains may be attributed to
variations in the nucleotide sequences of the flocculin genes and their
regulators. This study uncovers the potential of flocculation for
enhanced lactic acid production in yeast, offering insights into
metabolic mechanisms and potential gene targets for strain improvement.
Length of Stay, Hospitalization Cost, and Infection Rate for Inpatients With Vascular Access Devices With and Without History of Injection Drug Use
Authors: Soloway Laura , Kärpänen Tarja 
Published: December 2023

HighlightsThe rate of IDU among those who received a VAD placement was 3%. The VAD + IDU patients had 1.8 times longer mean LOS than VAD-only cohorts. The VAD + IDU cohort had 1.9 times higher mean inpatient cost than VAD-only cohorts. PPCRI increased in VAD + IDU cohort during pandemic.
Cherepovets Prisoner-of-War Camp No. 158 (1942–1948): Structure, Population, Production Activity
Authors: Кузьминых А.Л. 
Published: December 2023

В статье на основе широкого круга источников официального и личного происхождения рассмотрена история Череповецкого лагеря для военнопленных № 158. Автором раскрыты этапы деятельности лагеря, начиная с проверки советских военнослужащих, прошедших немецкий плен или окружение, и заканчивая трудовым использованием военнопленных германской армии и ее союзников. В статье приведены данные о дислокации и производственной специализации лагерных отделений, численности и составе военнопленных, а также лагерного персонала. Исследование раскрывает важную роль лагеря в эвакуации военнопленных с фронтов и организации их трудового использования, а также его вклад в развитие экономики и транспортной инфраструктуры Вологодской области.
Based on a wide range of sources of official and personal origin, the article examines the history of the Cherepovets Prisoner-of-War Camp no. 158 The author reveals the stages of the camp’s activities, starting with screening of Soviet military men who had been in German captivity or encirclement and ending with the labor use of prisoners of war of the German army and their allies. The article provides data on the location and industrial specialization of subcamps as well as the numbers and composition of prisoners of war and camp personnel. The study reveals the important role of the camp in the evacuation of prisoners of war from the fronts, the organization of their labor use, and the contribution to the development of the economy and transport infrastructure of Vologda Oblast.
Russisk politikk: En innføring (2. utgave)
Authors: Skak Mette 
Published: December 2023

Russisk politikk. En innføring gennemgår det russiske politiske system ud fra Richard Sakwas, dvs. Ernst Fränkels dobbeltstatsteori. Forfatterne Geir Hønneland og Jørgen Holten Jørgensen understreger, at Rusland er autoritært kleptokrati, inden de går i gang med hen over seks kapitler at beskrive Putins Rusland i formel juridisk og institutionel optik. Resultatet er en grundig og livligt skrevet bog; med andre ord en læseværdig folkeoplysende bog ikke mindst i kraft af det afsluttende kapitels vigtige pointe om hvordan Putins Massnahmenstaat æder sig ind på den normative russiske stat.
Russisk politikk. En innføring (Russian Politics: An Introduction) examines the Russian political system from the perspective of Richard Sakwa's, i.e., Ernst Fränkel's dual state theory. The authors Geir Hønneland and Jørgen Holten Jørgensen first define Russia as an authoritarian kleptocracy and then proceed to describe Putin's Russia in formal legal and institutional terms. The result is a thorough and well-written book – in other words, a book worth reading, not least for the concluding chapter's important point about how Putin's Massnahmenstaat eats away at the normative Russian state.
Teachers’ Knowledge of Students’ Learning Strategies: Recommendations and Evaluations
Authors: Granström Mikk , Härma Eliis , Kikas Eve 
Published: December 2023

The objective of this research was to identify which learning strategies pre and in-service teachers (N = 340) recommend to students in two hypothetical learning situations, in order to examine how teachers evaluate students’ learning strategies, and to study relations between recommendations and evaluations. Among the recommended and evaluated learning strategies, four tapped deep learning, and two tapped surface learning. Results showed that teachers mainly recommended either deep-learning strategies or a combination of deep and surface-learning strategies. Teachers gave better evaluations of deep-learning strategies compared to surface-learning strategies. Differences in evaluations of surface-learning strategies and interleaving were found between teachers who recommended only deep-learning strategies and those who recommended both types of strategies.
Simulation Incubator as an Activation Method of Music Management Teaching at the Faculty of Education
Authors:   University of West Bohemia, Bařtipánová Soňa 
Published: December 2023

The paper aims to show the reader how to use an economic-manager instrument in the shape of an incubator in the teaching process at the faculty of pedagogy. The research on the importance of using a simulation incubator as an activation teaching method is integrated into the subject Introduction to Management in Music and further subjects – Grant Projects in Culture (taught at the Department of Music at the Faculty of Pedagogy in Plzeň). These subjects should prepare the students for the future role of a project manager in the sphere of culture and art projects. Students acquire theoretical knowledge and terminology they can later use to realize their own project in a simulated incubator – the former Jesuit College Refectory in Klatovy. The method of teaching Introduction of Music Management stems from Graham Wells’ theory and his art of thinking, which is the methodology basis of research.