bluuebunny/crossref_metadata_2025_split huggingface dataset:
The improvement of heat transfer using Co/SiO2 spiral structured catalyst for green diesel production by Fischer–Tropsch synthesis
Authors: Aurud Pronprom , Srifa Atthapon , Koo-Amornpattana Wanida , Assabumrungrat Suttichai , Wongsakulphasatch Suwimol , Fukuhara Choji , Ratchahat Sakhon 
Published: August 2024

AbstractIn this study, the improvement of heat transfer was applied to eliminate hotspots of a highly exothermic reaction, Fischer–Tropsch synthesis (FTS), by means of two facile methods: (I) adding high thermal conductive materials media diluted in catalysts (SiC and Al chips), and (II) using structured reactors equipped with well-designed structured catalysts with advantages of heat dissipation/removal. The 20%Co/SiO2 catalyst powder prepared by simple impregnation was employed for constructing structured catalysts and granular packed bed catalysts. The structured catalyst was prepared by coating method of Co/SiO2 slurry on an aluminum spiral and plate substrate. The catalytic performance of as-prepared catalysts was then tested for FTS in a fixed-bed reactor at 210–230 °C, 20 bar. Both gaseous and liquid products were collected and analyzed. The heat transfer improvement of packed bed catalytic system and structured catalytic system were compared and discussed. As a result, the structured catalytic system with spiral structured catalyst can provide the best improvement of heat/mass transfer, resulting in enhanced diesel selectivity, though the oil production rate was unsatisfactory. Meanwhile, among the packed bed catalytic systems, SiC media possessed the best heat removal material, producing the highest oil yield. In addition, the fresh and spent catalysts were analyzed by several techniques including TEM, SEM, XRD, BET, ICP-OES, H2–TPR, and TGA to relate the physicochemical properties of the prepared catalysts and its FTS performance.
A multi‐level coordinated scheduling strategy for shared energy storage systems under electricity spot and ancillary service markets
Authors: Dou Qing , Gao Xiang , Wu Yuheng , Chen Yu , Xie Rui , Chen Jialin 
Published: August 2024

AbstractThis paper proposes a multi‐level coordinated scheduling strategy for shared energy storage systems (SESS) under electricity spot and ancillary service markets to maximize the overall operational profit. At the upper level, an optimal day‐ahead bidding model is formulated to allocate optimal capacities of SESS for engaging in electricity transactions and offering peak shaving reserve over the scheduling horizon. Then, a joint market clearing model is presented to simultaneously optimize awarded capacities of SESS and marginal prices of electricity spot and ancillary service markets at the middle level. Furthermore, the lower level aims to correct the coordinated scheduling strategy for minimizing the intra‐day scheduling cost under the uncertainty of renewable energy sources and load demand. Finally, a linear relaxation method is applied to transform the proposed strategy into a mixed‐integer linear programming problem for enhancing the computation efficiency. Comparative case studies have validated the superior performance of the proposed strategy for better utilization of available storage capacity and arbitrage maximization.
A novel wind power forecast diffusion model based on prior knowledge
Authors: Han Li , Cheng Yingjie , Chen Shuo , Wang Shiqi , Wang Junjie 
Published: August 2024

AbstractTo improve the forecast accuracy of wind power, diffusion model based on prior knowledge (DMPK) is proposed. Different from the traditional diffusion model (DM), where the noise perturbation in the diffusion or generation process is random, the noise added in DMPK is modified aiming to the characteristics of wind power signals. The distribution of wind power forecast errors is not a standard Gaussian. Wind power forecast errors are related to forecast methods, weather conditions, and other factors, containing both random signals and certain regularity. This paper adapts the Gaussian distribution to fit the historical forecast error to represent the prior knowledge of wind power. Then, the sampling distribution is derived from its relationship with the fitted prior distribution to replace the standard Gaussian in DM. Taking the prior knowledge into account during the process of noise sampling, the data in the forward process of DMPK can be guided by the distribution of historical errors for diffusion, while the generated result by the reverse process is more consistent with the actual wind power signal. Finally, the superiority of the proposed method is verified by using the wind power data from two real‐world wind farms.
K2-399 b is not a planet
Authors: Lillo-Box J. , Latham D. W. , Collins K. A. , Armstrong D. J. , Gandolfi D. , Jensen E. L. N. , Castro-González A. , Balsalobre-Ruza O. , Montesinos B. , Sousa S. G. , Aceituno J. , Schwarz R. P. , Narita N. , Fukui A. , Cabrera J. , Hadjigeorghiou A. , Kuzuhara M. , Hirano T. , Fridlund M. , Hatzes A. P. , Barragán O. , Batalha N. M. 
Published: August 2024

Context. The transit technique has been very efficient over the past decades in detecting planet-candidate signals. The so-called statistical validation approach has become a popular way of verifying a candidate’s planetary nature. However, the incomplete consideration of false-positive scenarios and data quality can lead to misinterpretation of the results.
Aims. In this work, we revise the planetary status of K2-399 b, a validated planet with an estimated false-positive probability of 0.078% located in the middle of the so-called Neptunian desert, and hence a potential key target for atmospheric prospects.
Methods. We used radial velocity data from the CARMENES, HARPS, and TRES spectrographs, as well as ground-based multiband transit photometry provided by LCOGT MuSCAT3 and broad band photometry to test the planetary scenario.
Results. Our analysis of the available data does not support the existence of this (otherwise key) planet, and instead points to a scenario composed of an early G-dwarf orbited –with a period of a 846.62−0.28+0.22 days– by a pair of eclipsing M-dwarfs (hence a hierarchical eclipsing binary) likely in the mid-type domain. We thus demote K2-399 b as a planet.
Conclusions. We conclude that the validation process, while very useful to prioritize follow-up efforts, must always be conducted with careful attention to data quality while ensuring that all possible scenarios have been properly tested to get reliable results. We also encourage developers of validation algorithms to ensure the accuracy of a priori probabilities for different stellar scenarios that can lead to this kind of false validation. We further encourage the use of follow-up observations when possible (such as radial velocity and/or multiband light curves) to confirm the planetary nature of detected transiting signals rather than only relying on validation tools.
Subjektive gesundheitliche Beeinträchtigung und assoziierende
Faktoren in der Hitzeperiode des Sommers 2022 – Ein
Online-Survey
Authors: Buhtz Christian , Frese Thomas , Jahn Patrick , Kantelhardt Eva , Kuhlmann Alexander , Lückmann Sara Lena , Meyer Gabriele , Meyer-Feil Thorsten , Schildmann Jan , Steckelberg Anke , Knöchelmann Anja 
Published: August 2024

Zusammenfassung
Hintergrund Hitzeperioden können das Wohlbefinden mindern und sind mit
einer erhöhten Mortalität assoziiert. Die individuellen Maßnahmen zum
Hitzeschutz sind oft unzureichend, wobei die Wahrnehmung des eigenen Risikos
eine wichtige Rolle spielt. Aufgrund unterschiedlicher Betroffenheit ist davon
auszugehen, dass die Wahrnehmung sich zwischen Bevölkerungsgruppen
unterscheidet. Vermutlich ist auch die Aufmerksamkeit für Symptome höher, wenn
sich Personen mit dem Thema Hitze beschäftigen und darüber informieren. Daher
untersucht diese Studie die subjektive gesundheitliche Beeinträchtigung während
der Hitzeperiode des Jahres 2022, den Zusammenhang mit soziodemographischen und
ökonomischen Faktoren sowie der empfundenen Hitzebelastung und der individuellen
Auseinandersetzung mit dem Thema.
Methode Online-Erhebung einer bevölkerungsbasierten Stichprobe aus fünf
Bundesländern. Multivariable Regressionsanalysen zum Zusammenhang zwischen
subjektiver gesundheitlicher Beeinträchtigung durch Hitze und möglichen
Risikoindikatoren.
Ergebnisse Von 3111 angeschriebenen Personen, gab es 1522 Rückmeldungen,
von denen 649 (20,9%) in die Auswertung eingingen, da sie im Sommer 2022 in
ihrer Wohnregion von Hitze betroffen waren. Die subjektive gesundheitliche
Beeinträchtigung lag im Mittel bei 9,29 (SD 5,25) von 29 möglichen Punkten.
Höheres Alter war mit einer geringeren subjektiven Beeinträchtigung assoziiert;
-1,36 Punkte (95%-KI: -4,10; 1,38) in der Gruppe der ab 80-Jährigen im Vergleich
mit der Referenzgruppe der 60 bis 69-Jährigen. Eine hohe Beeinträchtigung gaben
Frauen und Personen mit geringem Bildungsgrad an. Eine niedrige Beeinträchtigung
war mit hoher empfundener Informiertheit assoziiert.
Schlussfolgerung Interventionen zur Reduzierung von hitzebedingten
Gesundheitsproblemen sollten einen erweiterten Personenkreis, insbesondere junge
Menschen, Frauen, Menschen mit geringer Bildung und Berufstätige,
adressieren.
Entwicklung der Pflegebedürftigkeit und Inanspruchnahme pflegerischer
Leistungen von 2017 bis 2022 auf Basis der Routinedaten der AOK
Sachsen-Anhalt
Authors: Heinrich Stephanie , Fleischer Steffen , Meyer Gabriele 
Published: August 2024

Zusammenfassung
Hintergrund Sachsen-Anhalt hat im Vergleich der Bundesländer den höchsten
Altenquotienten und mit der weiteren Alterung der Bevölkerung wird der Anteil
der Pflegebedürftigen absehbar steigen. Die SARS-CoV-2-Pandemie hat die
pflegerische Versorgung beeinflusst, die Inanspruchnahme von Leistungen
reduziert und zu Veränderungen in den Pflegearrangements geführt. Ziel dieser
Arbeit ist es, die Entwicklung der Pflege in Sachsen-Anhalt unter
Berücksichtigung der gesetzlichen Änderungen, der Pandemie und der Entwicklung
nach Aufhebung der Kontaktsperre zu analysieren.
Methode Die Analyse verwendet aggregierte und anonymisierte Daten von
pflegebedürftigen Versicherten der AOK Sachsen-Anhalt aus den Jahren 2017 bis
2022. Es werden zeitliche Veränderungen in der Inanspruchnahme verschiedener
Pflegeleistungen untersucht.
Ergebnisse 2017 sind 64.591 Versicherte der AOK Sachsen-Anhalt
pflegebedürftig. Die Prävalenz nimmt über die Beobachtungsjahre kontinuierlich
zu. Für den Pflegegrad (PG) 1 ist in den ersten Jahren nach dessen Einführung
von 2017–2019 der deutlichste und stärkste Anstieg zu verzeichnen. Der
überwiegende Anteil der pflegebedürftigen Personen (41–44%) ist in PG 2
eingestuft. Insgesamt zeigt sich ein stetig zunehmender Anteil der Geldleistung
bereits seit 2017 von 40,5% zu 50,3% im Jahr 2022. Parallel sinkt der Anteil des
stationären Leistungsbezugs in allen PG, am deutlichsten in PG 2. Dieser
gegenläufige Trend, die Zunahme der ambulanten Versorgung und Abnahme der
stationären Versorgung besteht bereits seit 2017, verstärkt sich aber ab 2020,
dem Pandemiezeitraum.
Schlussfolgerung Die Analyse zeigt seit der Einführung des neuen
Pflegebedürftigkeitsbegriffs einen Zuwachs an pflegebedürftigen Personen, wobei
solche mit erheblichen Beeinträchtigungen (PG 2) den größten Teil ausmachen. Es
ist ein deutlicher Anstieg der Personen mit Geldleistung und ein Rückgang der
stationären Versorgung zu verzeichnen. Im Vergleich zur bundesweiten AOK-Analyse
zeigt Sachsen-Anhalt eine stärkere Nutzung ambulanter Pflegedienste in
häuslichen Arrangements. Die Analyse während der COVID-19-Pandemie zeigt eine
verstärkte Tendenz zur häuslichen Pflege, aber keine grundlegende Veränderung.
Besondere Situationen wie Kontaktbeschränkungen könnten die Nutzung bestimmter
Pflegeleistungen beeinflusst haben. Zukünftige Forschungen sollten die
Gestaltung häuslicher Pflegearrangements und die Bedürfnisse der Betroffenen
genauer untersuchen.
Diagnosis and management of heterotopic intramural pregnancy after in vitro fertilization: an eight-case series
Authors: Cai Pei , Zheng Mingxiang , Wang Qian , Wen Yi , Chen Hui , Gong Fei , Lin Ge , Li Xihong , Ouyang Yan 
Published: August 2024

Abstract
Purpose To analyze the ultrasound characteristics, clinical management, and pregnancy outcomes of heterotopic intramural pregnancies (HIMPs) after embryo transfer.
Methods This was a retrospective observational study of women who were diagnosed with HIMPs. The ultrasound characteristics, clinical treatment, and pregnancy outcomes of patients with HIMPs were evaluated.
Results Eight women with HIMPs were included. Among them, 6 patients were diagnosed by transvaginal sonography, and 2 patients were misdiagnosed with heterotopic interstitial pregnancy. The diagnostic accuracy was 75% (6/8). Five patients with HIMPs were diagnosed at the time of the initial scan (5+6–6+3 weeks). An intramural gestational sac was observed in all 6 patients, and an embryo with cardiac activity was detected in one patient on the follow-up scans. Intrauterine pregnancies (IUPs) were revealed in all 6 patients, and embryo(s) with cardiac activity were observed in 5 patients at the time of the initial diagnosis or later. The patients receiving expectant treatment all presented with bagel signs, while patients with embryos with cardiac activity all underwent surgery. Among the 6 diagnosed women, 1 patient was initially treated medically, 4 were treated expectantly, and 1 was treated surgically. Among the 6 diagnosed patients, the IUPs of 5 patients resulted in live infants.
Conclusion Single ET should be recommended to decrease the possibility of HIMP. An accurate diagnosis of HIMP was reached in most cases by detailed ultrasound early in the first trimester. Most IUPs of HIMPs seem to have good outcomes with timely and proper management. Expectant management might be a possible choice for nonviable intramural pregnancies.
Radiographs in Pediatric Rheumatology: Where Do We Stand?
Authors: Bhalla Deeksha , Jana Manisha , Bagri Narendra 
Published: August 2024

AbstractRheumatic disorders in children include inflammatory arthritis, inflammatory bone disorders such as chronic nonbacterial osteomyelitis (CNO), connective tissue disorders, and vasculitides (juvenile dermatomyositis, scleroderma). The diagnosis in these children is based on a combination of history, clinical examination, and laboratory investigations. Radiographs play an important role in children with arthritis, who have atypical presentation or for assessment of disease-related damage and differentiation from mimics. Further, radiographs also have an ancillary role in the assessment of musculoskeletal disorders such as dermatomyositis and hemophilia. This review seeks to present a detailed analysis of the specific indications and advantages of radiographs in the situations. Further, a structured reporting format for assessment of radiographs in pediatric rheumatic disorders has also been presented for the reader's reference.
A flexible silicone tube arrangement structure triboelectric nanogenerator for tennis training monitoring
Authors: Deng Xu 
Published: August 2024

As the Internet of Things (IoTs) rapidly gain popularity, the demand for self-powered flexible electronic devices is continuously rising, particularly in the intelligent sports field. Hence, we introduced a silicone tube-based triboelectric nanogenerator (ST-TENG) designed for mechanical energy harvesting and tennis training monitoring. The ST-TENG, with its innovative tubular structure, effectively harvests low-frequency mechanical energy and converts it into electrical energy. At a working frequency of 6 Hz, the ST-TENG achieved an open-circuit voltage (Voc) of 122.51 V, a short-circuit current (Isc) of 15.05 µA, and a transfer charge (Qsc) of 33.74 nC. The ST-TENG demonstrates high sensitivity and accuracy in capturing subtle motion details, providing comprehensive data on various aspects of an athlete’s performance. The ST-TENG demonstrated excellent responsiveness to pressure and bending, making it suitable for real-time motion monitoring in tennis. Integrating the ST-TENG into the clothing and equipment of tennis players effectively monitored wrist, waist, and foot movements, providing detailed motion data. This research paves the way for developing highly efficient, self-powered wearable sensors that can significantly enhance the accuracy and sustainability of real-time athletic training monitoring.
The ethnopragmatics of Akan leave-takings and farewells
Authors: Agyekum Kofi 
Published: August 2024

Abstract
The paper examines leave-takings and farewells as linguistic routines in Akan. It emerged from my previous works
on ethnopragmatics of Akan linguistic routines, namely apology, requests, greetings, thanking, advice, compliments, etc. This
paper adopted Weigand’s (2010) Mixed Game Model, which deals with dialogic action games. It employs qualitative approaches
including interviews, observation, and the recording of natural ethnographic events in the Akan society. These include closings
and farewells at funerals, durbars, visits, travelling, arbitrations, folksongs, etc. The paper discusses the ethnosemantics of
the leave-takings and farewell expressions. The findings of this paper will contribute to the use of dialogic action games in
discussing other linguistic routines. This study will help further research in leave-taking and farewell in other Ghanaian
languages.
Impact of plasma-modified pretreatment on the tensile properties of carbon fiber-reinforced epoxy composites
Authors: Ye Bei , Lin Shiyun , Yu Lintao , Peng Chenyun 
Published: August 2024

Abstract
Low-temperature jet plasma modification technology is a surface treatment method designed to enhance the surface properties of materials without causing severe thermal damage. This technique modifies surface characteristics by creating plasma and utilizing ions and reactive groups within the plasma to chemically interact with the material’s surface. In this study, surface modification of carbon fibers was carried out by using low-temperature jet mixed oxygen plasma technology at treatment speeds of 25 mm/s, 50 mm/s, 100 mm/s, and 200 mm/s. Following the modification process, carbon fiber-reinforced epoxy composites were fabricated by using a hand-lay-up technique. Subsequently, the tensile properties of the carbon fiber composites were tested to evaluate the impact of the plasma treatment on their mechanical performance. The experimental results demonstrated a significant enhancement in the tensile properties of the composites when the carbon fibers were pretreated at a rate of 50 mm/s. This enhancement was evidenced by an impressive increase of 82.38% in tensile strength and 30.96% in tensile modulus compared to untreated samples. This signifies that low-temperature plasma treatment has a beneficial effect on enhancing the surface properties of carbon fibers and improving the performance of composites. This finding provides substantial support for the extensive application of carbon fiber composites.
Performance analysis and optimization of multi-energy complementary combined heat and power system considering the influence of time-of-use price
Authors: Ding Zeyu , Chen Lei , Rong Shimin , Wang Huijing , Zhang Fan , Tian Shijun 
Published: August 2024

Abstract
The multi-energy complementary system can meet the increasingly abundant and diversified energy consumption needs of users and, at the same time, help to improve energy utilization efficiency, reduce environmental pollution, and optimize the balance of energy supply and demand. In this paper, a multi-energy complementary cogeneration system with a gas turbine distributed photovoltaic, gas boiler, and heat storage tank is proposed, and the operation scheduling optimization model of the system is constructed. Aiming to minimize the comprehensive cost of economy and carbon emission, the model adopts a linear programming method to optimize the operation scheduling of multi-energy complementary systems. Taking a multi-energy complementary cogeneration system as an example, the key equipment of the system is optimized under three different scenarios with different time-of-use prices, and the influence of time division of time-of-use electricity price on the comprehensive cost of the system is analyzed. The results show that the time division method, which is more in line with the system net load curve, can effectively reduce the comprehensive cost of the complementary system and increase the consumption space of new energy.
Study on characteristics of the resistivity parameter and its coupling model of Chazangcuo copper-lead-zinc deposits based on microscopic analysis
Authors: Wei Shenyun , Wang Jianguo , Hu Jian , Li Yan , Wang Zhinan 
Published: August 2024

Abstract
The resistivity exploration has made a great contribution to prospecting at the macro level, but the resistivity exploration at the micro level is relatively weak. In this paper, the corresponding resistivity is analyzed through a geochemical element test, temperature and pressure test, water content and porosity test, and the resistivity parameter model of the rock and ore is established based on the response surface. The main conclusions and understandings obtained are as follows: with the increase of Cu-Pb-Zn content, the rock-ore resistivity shows an obvious decreasing trend, with sphalerite resistivity (72.8×10−2 Ω·m) > pyrite resistivity (32.5×10−2 Ω·m) > galena resistivity (76.5×10−3 Ω·m) > chalcopyrite (11.3×10−3 Ω·m). The resistivity increases with the temperature, showing a quadratic term function trend increases. The resistivity decreases with the increase of pressure, decreasing rapidly at the beginning of loading and gradually slowing down. The resistivity decreases rapidly with the increase of water content and porosity in an exponential function trend. The degree of influence of four factors, temperature, pressure, porosity, and water content, on the resistivity of the ore samples, is the order of water content, porosity, pressure, and temperature. The coupled model of resistivity of Cu-Pb-Zn ores established by multivariate quadratic regression analysis is more reliable, and the predicted value of rock and ore resistivity is more consistent with the test data.
Characterization of temperature rise of carbon ceramic brake disc
Authors: Zhang Zhenxian , Zheng Shize 
Published: August 2024

Abstract
Carbon ceramic can be utilized in the manufacture of new brake discs for trains with high speed as a new composite material. In this article, temperature rises of C/C-SiC discs in emergency braking are simulated using conducting the front-head train model containing brake discs, and simulation results are analyzed with those of steel brake discs. With 400 km/h braking speed, the temperature peak of carbon ceramic disc can reach 1098.56 K at 86.3 s under braking conditions of emergency.
Mechanical simulation analysis of an electric scroll compressor
Authors: Yao Wenxu , Liu Mingli , Gong Chaoyue , Zhao Tengshan , Gao Yidan 
Published: August 2024

Abstract
As a precision automotive component, electric scroll compressors have high requirements for reliability. In order to save the cost of environmental testing and shorten the market cycle of new products, the modal parameters of a compressor are measured, and the first six modal parameters are obtained. Secondly, the simplified finite element model of the compressor is established, modal analysis is carried out, and the modal frequency error obtained by the two methods is controlled within a reasonable range to ensure the accuracy of the modeling. Finally, based on the established simulation model, the structural response and stress of the compressor under various working conditions, such as sinusoidal vibration and random vibration, are analyzed, and the extreme values of displacement and stress are obtained. The results show that the structural design of the compressor meets the requirements of the environmental test of on-board equipment. The test and simulation methods used in this paper also have certain reference significance for other mechanical equipment.