bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Work-Related Stress on HSE Department Employee in Concentrating Division of PT Freeport Indonesia
Authors: Susanto Arif , Iqbal Muhamad Razif , Khaliwa Agra Mohamad , Putra Edi Karyono , Syuhada Ambar Dani , Abdillah Asep Dian
Published: November 2023

Work stress can arise from within or from outside the organization, the cause of which is often felt by workers. Work stress is included in occupational diseases and generally comes from the amount or lack of understanding of the work. The purpose of this study is to diagnose work stress on employees in the HSE Department of the Concentrating Division of PT Freeport Indonesia, which is assessed through 6 aspects contained in the Regulation of the Minister of Manpower Number 5 of 2018. Type of research is semi-quantitative, with a cross-sectional research design. The research method uses a survey, and the sampling technique used is a saturated sample. The survey results show that the overall level of work stress on employees is 2.81. This value indicates that the level of work stress felt by employees of the HSE Division is classified as mild, because the score obtained is less than 9. The mean aspect of role ambiguity is 2.73; role conflict 2.76; quantitative work overload 2.75; qualitative work overload 2.87; career development 3; and responsibility towards others 2.74. Based on these values, it can be concluded that each employee of the HSE Department has high accountability from each function as well as the division of personal responsibility to regulate the determination of work priorities and rest periods. However, the majority of employees still feel that there are some tasks that are deemed unnecessary, the existence of high skill expectations from superiors, and the lack of opportunities for promotion or career development within the organization which can be a stressor in the department.
Geschlechtersensible Physiotherapie steckt noch in den Kinderschuhen – Wissenschaft nachgefragt
Authors: Veit Katrin
Published: November 2023

Trotz bestehender biologischer und krankheitsspezifischer Unterschiede zwischen weiblichen und männlichen Körpern gibt es häufig nur Daten zu männlichen Populationen in der medizinischen Forschung und im Gesundheitssystem. Angewendet werden diese jedoch auf beide Geschlechter gleichermaßen. Ann-Kathrin Brodowski widmete sich diesem Thema in ihrer Bachelorarbeit und möchte dafür ein Bewusstsein in der Physiotherapie schaffen.
Eine Auszeit von Spastik, Schmerzen und Lähmung – Yoga-Waldbaden-Retreat für Menschen mit Querschnittlähmung
Authors: Breuer Julian
Published: November 2023

Die Kombination aus Dehnung, Kraft, Entspannung und Wahrnehmung macht sich Physiotherapeut Julian Breuer zunutze und konzipiert nach einem einprägsamen Selbsterlebnis ein Yoga-Waldbaden-Retreat für seine Patient*innen mit Querschnittlähmung. Schon der erste Termin wird ein Erfolg.
Polyphenols, Antioxidants, and Wound Healing of Lecythis pisonis Seed Coats
Authors: Pimentel Elisângela Flávia , de Oliveira Bruno Gomes , Pereira Ana Claudia Hertel , Figueira Mariana Moreira , Portes Danielle Braga , Scherer Rodrigo , Ruas Fabiana Gomes , Romão Wanderson , Fronza Márcio , Endringer Denise Coutinho
Published: November 2023

To better use the Lecythis pisonis Cambess. biomass, this study investigates whether Sapucaia seed coats present wound healing properties. We analyzed the antibacterial, antioxidant,
and wound healing-promoting potentials, plus cytotoxicity and stimulation of vascular endothelial growth factor-A. The chemical composition was analyzed by positive ion mode electrospray
ionization Fourier transform ion cyclotron resonance mass spectrometry. A total of 19 compounds were identified, such as proanthocyanidin A1, procyanidins A1, B2, and C1, epigallocatechin,
and kaempferol (p-coumaroyl) glycoside. Potent antioxidant strength/index was verified for 2,2-diphenyl-1-picrylhydrazyl radical (IC50 = 0.99 µg/mL) and ferric reducing
antioxidant power (IC50 = 1.09 µg/mL). The extract did not present cytotoxicity and promoted significant cell migration and/or proliferation of fibroblasts (p < 0.05). Vascular
endothelial growth factor-A was stimulated dose-dependently at 6 µg/mL (167.13 ± 8.30 pg/mL), 12.5 µg/mL (210.3 ± 14.2 pg/mL), and 25 µg/mL (411.6 ± 29.4 pg/mL). Platelet-derived growth
factor (PDGF) (0.002 µg/mL) was stimulated at 215.98 pg/mL. Staphylococcus aureus was susceptible to the extract, with a minimum inhibitory concentration of 31.25 µg/mL. The
identified compounds benefit the antioxidant activity, promoting hemostasis for the wound healing process, indicating that this extract has the potential for use in dermatological
cosmetics.
Facilitated Synthetic Access to Boronic Acid-Modified Nucleoside Triphosphates and Compatibility with Enzymatic DNA Synthesis
Authors: Niogret Germain , Röthlisberger Pascal , Hollenstein Marcel , Levi-Acobas Fabienne , Bonhomme Frédéric , Gasser Gilles
Published: November 2023

Decorating nucleic acids with boronic acids can extend the usefulness of oligonucleotide-based tools to the development of medical imaging agents, the promotion of binding of aptamers to markedly more challenging targets, or the detection of (poly)saccharides. However, due to the hygroscopic nature and high intrinsic reactivity of boronic acids, protocols for their introduction into nucleic acids are scarce. Here, we have explored various synthetic routes for the crafting of nucleoside triphosphates equipped with phenylboronic acids. Strain-promoted azide–alkyne cycloaddition appears to be the method of choice for this purpose and it enabled us to prepare a modified nucleotide. Enzymatic DNA synthesis permitted the introduction of up to thirteen boronic acid residues in oligonucleotides, which bodes well for its extension to SELEX and related methods of in vitro selection of functional nucleic acids.
The Hepatic Porphyrias: Revealing the Complexities of a Rare Disease
Authors: Balogun Oluwashanu , Nejak-Bowen Kari
Published: November 2023

The porphyrias are a group of metabolic disorders that are caused by defects in heme biosynthesis pathway enzymes. The result is accumulation of heme precursors, which can cause neurovisceral and/or cutaneous photosensitivity. Liver is commonly either a source or target of excess porphyrins, and porphyria-associated hepatic dysfunction ranges from minor abnormalities to liver failure. In this review, the first of a three-part series, we describe the defects commonly found in each of the eight enzymes involved in heme biosynthesis. We also discuss the pathophysiology of the hepatic porphyrias in detail, covering epidemiology, histopathology, diagnosis, and complications. Cellular consequences of porphyrin accumulation are discussed, with an emphasis on oxidative stress, protein aggregation, hepatocellular cancer, and endothelial dysfunction. Finally, we review current therapies to treat and manage symptoms of hepatic porphyria.
The influence of the Chinese Cinderella (“Yeh-Shen”) on the evolving image of Cinderella in the West
Authors: Ou Peiyi , Zhang Xiaohong
Published: November 2023

Taking Cinderella as an evolving image across cultures, this article compares the image of Yeh-Shen in major English translations to those of Cinderella in the Western classics of Giambattista Basile, Charles Perrault, the Brothers Grimm, and Disney. The study incorporates a comparison of the story types and the protagonists’ family backgrounds, social statuses, and personalities in constructing the evolving image of Cinderella. It is argued that the widely acknowledged story genealogy of “Basile–Perrault–the Brothers Grimm–Disney” is questionable in terms of the phenomenon of Cinderella “becoming of the people’s princess”. Evidence found in both reader acceptance and postmodernist rewritings supports the hypothesis that the story of Yeh-Shen has had a substantial influence on the evolving image of Cinderella. The analysis of its English translation and acceptance from a comparative perspective brings to light the continued legacy of the literary image of Yeh-Shen, illustrates the esthetic complexity and possibilities of image translation, and most importantly, reveals the rich roots of postmodernist themes contained in the Chinese tale that has long influenced the West.
Conformations of borneol and isoborneol in the gas phase: Their monomers and microsolvation clusters
Authors: Pinacho Pablo , Quesada-Moreno María Mar , Schnell Melanie
Published: November 2023

Borneol is a natural monoterpene with significant applications in various industries, including medicine and perfumery. It presents several diastereomers with different physical and chemical properties, influenced by their unique structures and interactions with molecular receptors. However, a complete description of its inherent structure and solvent interactions remains elusive. Here, we report a detailed investigation of the gas-phase experimental structures of borneol and isoborneol, along with the description of their microsolvation complexes with the common solvents water and dimethyl sulfoxide. The molecules and complexes were studied using chirped-pulse Fourier transform microwave spectroscopy coupled to a supersonic expansion source. Although three rotamers are potentially populated under the conditions of the supersonic expansion, only one of them was observed for each monomer. The examination of the monohydrated complexes revealed structures stabilized by hydrogen bonds and non-covalent C–H⋯O interactions, with water as the hydrogen bond donor. Interestingly, in the clusters with dimethyl sulfoxide, borneol and isoborneol change their roles acting as donors. We further identified a higher-energy rotamer of the borneol monomer in one of the complexes with dimethyl sulfoxide, while that rotamer was missing in the experiment for the monomer. This observation is not common and highlights a specific position in borneol especially favorable for forming stable complexes, which could have implications in the understanding of the unique physical and chemical properties of the diastereomers.
State switching in the wake of a transverse circular cylinder in the transonic regime
Authors: Couliou Marie , Brion Vincent
Published: November 2023

The flow past a circular cylinder in a cross-flow configuration was investigated using a wind tunnel experiment across a range of Mach numbers M∞ from 0.30 to 0.85 and corresponding Reynolds numbers, based on diameter, ranging from 2×105 to 5×105. The boundary layer at the cylinder surface is either free or fixed turbulent using artificial tripping at azimuth 12.5°, 25°, and 50°. Measurements combine temporal recordings of the wall pressure and schlieren high-speed visualizations of the flow past and downstream of the cylinder. First, by attaching the tripping strips to the cylinder at the different azimuthal positions, the effect of the boundary layer state on the cylinder wake is found to be strong at subsonic speeds but much smaller in the transonic regime. Multiple flow states are observed depending on the value of M∞. Of particular interest was the narrow region between M∞=0.80 and =0.85, which yields three different states, namely the vortex shedding state, the parallel shear layer state, and the crossed shear layer state. By precisely managing back and forth travels in Mach number with the wind tunnel, it is found that the transitions between these states have a hysteresis behavior. This sub-critical behavior could explain the surprisingly variable threshold values between these different states reported in the literature.
The NexGen burner: Non-Reacting gaseous and spray dynamics
Authors: Kamin Manu , Eblin James , Khare Prashant
Published: November 2023

This paper reports the results of a comprehensive investigation to identify turbulent multiphase fluid dynamics through the NexGen burner used for fireworthiness certifications by the Federal Aviation Administration. The burner geometry consists of a draft tube, a stator to swirl the incoming air, a turbulator that is placed immediately downstream of the stator to increase the turbulence intensity of the swirling flow, and a burner cone that exhausts into the atmosphere. A Delavan type-W fuel nozzle, attached downstream of the turbulator injects Jet A into the burner cone, where it mixes with the turbulent swirling air, vaporizes and subsequently burns. The operating conditions consist of air and fuel mass flow rates of 0.0384 kg/s and 2.5 Gph at room temperature and pressure conditions. In this paper, we report on non-reacting fluid dynamics; the reacting flow analysis will be presented in a subsequent manuscript. To systematically analyze the flow configuration, three calculations are conducted. First, to validate our large eddy simulation-based framework, a case without the burner cone is conducted—our results are in reasonable agreement with experimental measurements. In the second configuration, to isolate the effect of liquid injection on turbulent flow physics, simulations are conducted with the burner cone but without fuel spray. Detailed analyses are conducted, including identification of flow structures, swirl generation, and the turbulent kinetic energy budget. Finally, Jet A is injected into the burner, and the spray and gaseous flow fields are quantified and compared with the flow structures developed without spray injection.
Ultra-low resistance Au-free V/Al/Ti/TiN ohmic contacts for AlGaN/GaN HEMTs
Authors: Garbe Valentin , Seidel Sarah , Schmid Alexander , Bläß Ulrich , Meissner Elke , Heitmann Johannes
Published: November 2023

We report on the electrical and microstructural characterization of an Au-free V/Al/Ti/TiN ohmic contact for AlGaN/GaN heterostructures. Ultra-low contact resistance and specific contact resistivity of Rc < 0.1 Ω mm and ρc < 2.4 × 10−7 Ω cm2 have been achieved with very low RMS surface roughness. This was accomplished at a comparably low annealing temperature of 800 °C and without applying any contact recess, regrowth, or implantation process. High electron mobility transistors were fabricated and a comparison of the electrical performance with state-of-the-art Ti/Al/Ti/TiN and Ti/Al/Ni/Au contacts was made. The contact formation mechanism is discussed on the basis of microstructural features.
Optimization of wind and solar energy storage system capacity configuration based on the Parzen window estimation method
Authors: Yu Qihui , Gao Shengyu , Sun Guoxin , Qin Ripeng
Published: November 2023

Compressed air energy storage (CAES) effectively reduces wind and solar power curtailment due to randomness. However, inaccurate daily data and improper storage capacity configuration impact CAES development. This study uses the Parzen window estimation method to extract features from historical data, obtaining distributions of typical weekly wind power, solar power, and load. These distributions are compared to Weibull and Beta distributions. The wind–solar energy storage system's capacity configuration is optimized using a genetic algorithm to maximize profit. Different methods are compared in island/grid-connected modes using evaluation metrics to verify the accuracy of the Parzen window estimation method. The results show that it surpasses parameter estimation for real-time series-based configuration. Under grid-connected mode, rated power configurations are 1107 MW for wind, 346 MW for solar, and 290 MW for CAES. The CAES system has a rated capacity of 2320 MW·h, meeting average hourly power demand of 699.26 MW. It saves $6.55 million per week in electricity costs, with a maximum weekly profit of $0.61 million. Payback period for system investment is 5.6 years, excluding penalty costs.
Study of the enhanced heat transfer characteristics of wavy-walled tube heat exchangers under pulsating flow fields
Authors: Zhang Liang , Wang Wenjie , Qu Pingping , Yao Xinyue , Song Jiabai , Wang Shuangzhu , Zhang Huimin
Published: November 2023

Heat exchangers have a very wide range of applications in many industrial fields, so the rational design and the performance are to improve the heat exchanger energy efficiency and reduce the production cost of an important means. In this paper, the heat transfer mechanism of pulsation is revealed by simulating and analyzing the effects of three pulsation parameters: volumetric flow rate, pulsation frequency, and pulsation amplitude on the flow and heat transfer of a wavy-walled tube heat exchanger, with the study focusing on the instability behavior that affects the heat transfer mechanism. The results reveal that the combined heat transfer performance of the wavy-walled tube heat exchanger is about 8.2% higher than that of the straight-walled tube heat exchanger. The flow field of the heat exchanger is more fully developed under the pulsating flow field, and its performance evaluation coefficients (PECs) are all greater than 1. It is also found that with the increase in the volume flow rate Qv, the heat transfer enhancement coefficient and PEC first increase and then decrease, and reach the maximum value near Qv = 2.0 m3/h; with the increase in the amplitude A, the vortex and heat transfer enhancement coefficient inside the heat exchanger increase, but the integrated heat transfer performance of the heat exchanger is gradually weakened; with the increase in the frequency fT, the heat transfer enhancement coefficient and PEC first increase gradually, but the increase gradually decreases and levels off in the later stages, reaching a maximum value near fT = 0.5 Hz. Meanwhile, the field coefficients of the wavy-walled tube heat exchanger were analyzed and found to be much smaller than 1, with an order of magnitude of 10−4, and the results also showed that the field coefficients were inversely proportional to the volume flow rate and directly proportional to the amplitude of pulsation and that the field coefficients showed a tendency of increasing and then decreasing with the change of pulsation frequency and reached a maximum value near fT = 0.5 Hz. This work provides an important reference for current manufacturing industries to optimize heat exchanger sizing and develop efficient thermal management systems.
Mitigating aberrant Cdk5 activation alleviates mitochondrial defects and motor neuron disease symptoms in spinal muscular atrophy
Authors: Miller Nimrod , Xu Zhaofa , Quinlan Katharina A. , Ji Amy , McGivern Jered V. , Feng Zhihua , Shi Han , Ko Chien-Ping , Tsai Li-Huei , Heckman Charles J. , Ebert Allison D. , Ma Yongchao C.
Published: November 2023

Spinal muscular atrophy (SMA), the top genetic cause of infant mortality, is characterized by motor neuron degeneration. Mechanisms underlying SMA pathogenesis remain largely unknown. Here, we report that the activity of cyclin-dependent kinase 5 (Cdk5) and the conversion of its activating subunit p35 to the more potent activator p25 are significantly up-regulated in mouse models and human induced pluripotent stem cell (iPSC) models of SMA. The increase of Cdk5 activity occurs before the onset of SMA phenotypes, suggesting that it may be an initiator of the disease. Importantly, aberrant Cdk5 activation causes mitochondrial defects and motor neuron degeneration, as the genetic knockout of
p35
in an SMA mouse model rescues mitochondrial transport and fragmentation defects, and alleviates SMA phenotypes including motor neuron hyperexcitability, loss of excitatory synapses, neuromuscular junction denervation, and motor neuron degeneration. Inhibition of the Cdk5 signaling pathway reduces the degeneration of motor neurons derived from SMA mice and human SMA iPSCs. Altogether, our studies reveal a critical role for the aberrant activation of Cdk5 in SMA pathogenesis and suggest a potential target for therapeutic intervention.
“May the path never close”
Authors: Abbasi Pyeaam , Mousavi Maryamossadat
Published: November 2023

Resistance to postcolonial oppressive ideologies assumes significance within Chinua Achebe’s Anthills of the Savannah (1987), portraying predicaments of a post-independence fictional African state of Kangan. Drawing on the Deleuze-Guattarian “ontology of becoming”, “rhizome”, “nomad thought”, distinction of “striated” and “smooth” spaces, their account of the “State Apparatus” and the “war machine”, and “assemblage”, the study demonstrates how Achebe entertains possibilities of convergence with their philosophy. It displays how the Kangan people, while engaging in “ontology of becoming”, strive to deterritorialise themselves from Sam’s State that attempts to define their subjectivity. Concurrently, Sam’s State implements varieties of schemes to re-subjugate its subjects under its territorial authority. The study concludes how the war machine’s menacing force eventually destabilises the whole “State Apparatus”.
‘Narrative structure’, ‘rhetorical structure’, ‘text structure’
Authors: Tincheva Nelly
Published: November 2023

The paper seeks to provide a cognitive-linguistic re-interpretation of the centuries-old notion of whole-text structure. The investigation presented here draws on 317 data sources selected through a scoping literature review. The paper demonstrates how text structure, narrative structure, rhetorical structure, etc. all represent metonymically one and the same multi-faceted underlying concept. That concept is argued to result from the amalgamated operation of conceptual metaphor and conceptual metonymy combined with the simultaneous and dynamic operation of (what are known in gestalt psychology as) profiling shifts. The paper further demonstrates how such shifts in profiling operate on text-worlds and discourse-worlds to bring about perceptions of a text’s ‘progression’ and of whole-text structure.
Speaking about knowledge
Authors: Aikhenvald Alexandra Y.
Published: November 2023

We focus on the grammatical expression of four major groups of meanings related to knowledge: I. Evidentiality: grammatical expression of information source; II. Egophoricity: grammatical expression of access to knowledge; III. Mirativity: grammatical expression of expectation of knowledge; and IV. Epistemic modality: grammatical expression of attitude to knowledge. The four groups of categories interact. Some develop overtones of the others. Epistemic-directed evidentials have additional meanings typical of epistemic modalities, while egophoricity-directed evidentials combine some reference to access to knowledge by speaker and addressee. Over the past thirty years, new evidential choices have evolved among the Tariana – whose language has five evidential terms in an egophoricity-directed system – to reflect new ways of acquiring information, including radio, television, phone, and internet. Evidentials stand apart from other means of knowledge-related categories as tokens of language ecology corroborated by their sensitivity to the changing social environment.
Prediction of Thermal Conductance of Complex Networks with Deep Learning
Authors: Zhu 朱 Changliang 昌良 , Shen 沈 Xiangying 翔瀛 , Zhu 朱 Guimei 桂妹 , Li 李 Baowen 保文
Published: November 2023

Predicting thermal conductance of complex networks poses a formidable challenge in the field of materials science and engineering. This challenge arises due to the intricate interplay between the parameters of network structure and thermal conductance, encompassing connectivity, network topology, network geometry, node inhomogeneity, and others. Our understanding of how these parameters specifically influence heat transfer performance remains limited. Deep learning offers a promising approach for addressing such complex problems. We find that the well-established convolutional neural network models AlexNet can predict the thermal conductance of complex network efficiently. Our approach further optimizes the calculation efficiency by reducing the image recognition in consideration that the thermal transfer is inherently encoded within the Laplacian matrix. Intriguingly, our findings reveal that adopting a simpler convolutional neural network architecture can achieve a comparable prediction accuracy while requiring less computational time. This result facilitates a more efficient solution for predicting the thermal conductance of complex networks and serves as a reference for machine learning algorithm in related domains.
A direct sampling-based deep learning approach for inverse medium scattering problems
Authors: Ning Jianfeng , Han Fuqun , Zou Jun
Published: November 2023

In this work, we focus on the inverse medium scattering problem (IMSP), which aims to recover unknown scatterers based on measured scattered data. Motivated by the efficient direct sampling method (DSM) introduced in Ito et al (2012 Inverse Problems
28 025003), we propose a novel direct sampling-based deep learning approach (DSM-DL) for reconstructing inhomogeneous scatterers. In particular, we use the U-Net neural network to learn the relation between the index functions and the true contrasts. Our proposed DSM-DL is computationally efficient, robust to noise, easy to implement, and able to naturally incorporate multiple measured data to achieve high-quality reconstructions. Some representative tests are carried out with varying numbers of incident waves and different noise levels to evaluate the performance of the proposed method. The results demonstrate the promising benefits of combining deep learning techniques with the DSM for IMSP.
The MLE is a reliable source: sharp performance guarantees for localization problems
Authors: Munier Nathanaël , Soubies Emmanuel , Weiss Pierre
Published: November 2023

Single source localization from low-pass filtered measurements is ubiquitous in optics, wireless communications and sound processing. We analyze the performance of the maximum likelihood estimator (MLE) in this context with additive white Gaussian noise. We derive necessary conditions and sufficient conditions on the maximum admissible noise level to reach a given precision with high probability. The two conditions match closely, with a discrepancy related to the conditioning of a noiseless cost function. They tightly surround the Cramér–Rao lower bound for low noise levels. However, they are significantly more precise to describe the performance of the MLE for larger levels. As an outcome, we obtain a new criterion for the design of point spread functions in single molecule microscopy.
The effect of intrinsic strain on the thermal expansion behavior of Janus MoSSe nanotubes: a molecular dynamic simulation
Authors: Zhang Run-Sen , Yin Xiang-Lei , Zhang Yu-Long , Jiang Jin-Wu
Published: November 2023

In this study, we conducted molecular dynamic simulations to investigate the thermal expansion behavior of Janus MoSSe nanotubes. We focused on understanding how the intrinsic strain in these nanotubes affects their thermal expansion coefficient (TEC). Interestingly, we found that Janus MoSSe nanotubes with sulfur (S) on the outer surface (MoSeS) exhibit a different intrinsic strain compared to those with selenium (Se) on the outer surface (MoSSe). In light of this observation, we explored the influence of this intrinsic strain on the TEC of the nanotubes. Our results revealed distinct trends for the TEC along the radial direction (TEC-r) and the axial direction (TEC-l

x
) of the MoSSe and MoSeS nanotubes. The TEC-r of MoSeS nanotubes was found to be significantly greater than that of MoSSe nanotubes. Moreover, the TEC-l

x
of MoSeS nanotubes was smaller than that of MoSSe nanotubes. Further analysis showed that the TEC-r of MoSeS nanotubes decreased by up to 37% as the radius increased, while that of MoSSe nanotubes exhibited a slight increase with increasing radius. On the other hand, the TEC-l

x
of MoSeS nanotubes increased by as much as 45% with increasing radius, whereas that of MoSSe nanotubes decreased gradually. These opposite tendencies of the TECs with respect to the radius were attributed to the presence of intrinsic strain within the nanotubes. The intrinsic strain was found to play a crucial role in inducing thermally induced bending and elliptization of the nanotubes’ cross-section. These effects are considered key mechanisms through which intrinsic strain influences the TEC. Overall, our study provides valuable insights into the thermal stability of Janus nanotubes. By understanding the relationship between intrinsic strain and the thermal expansion behavior of nanotubes, we contribute to the broader understanding of these materials and their potential applications.
Poisson problems involving fractional Hardy operators and measures
Authors: Chen Huyuan , Gkikas Konstantinos T , Nguyen Phuoc-Tai
Published: November 2023

In this paper, we study the Poisson problem involving a fractional Hardy operator and a measure source. The complex interplay between the nonlocal nature of the operator, the peculiar effect of the singular potential and the measure source induces several new fundamental difficulties in comparison with the local case. To overcome these difficulties, we perform a careful analysis of the dual operator in the weighted distributional sense and establish fine properties of the associated function spaces, which in turn allow us to formulate the Poisson problem in an appropriate framework. In light of the close connection between the Poisson problem and its dual problem, we are able to establish various aspects of the theory for the Poisson problem including the solvability, a priori estimates, variants of Kato’s inequality and regularity results.
Corrigendum: Multi-temperature generalized Zhdanov closure for scrape-off layer/edge applications (2022 Plasma Phys. Control. Fusion
64 045005)
Authors: Raghunathan M , Marandet Y , Bufferand H , Ciraolo G , Ghendrih Ph , Tamain P , Serre E
Published: November 2023

Corrigendum for the manuscript (Raghunathan et al 2022 Plasma Phys. Control. Fusion
64 045005).
α-In2Se3/Nb-doped MoSh2 heterojunction: a first-principles study
Authors: Lv Xiurui , Liu Guipeng , Mao Bangyao , Huang Heyuan , Zhao Guijuan , Yang Jianhong
Published: November 2023

The α-In2Se3 material is a two-dimensional ferroelectric semiconductor whose structural asymmetry gives it spontaneous polarization properties, and exhibits a direct bandgap structure when it is multilayered. α-In2Se3 is an n-type semiconductor, which is usually used in experiments to form heterojunctions with p-type semiconductors to prepare photodetectors. In this paper, we designed α-In2Se3/Nb-doped MoS2 heterojunction, because Nb doping is a good p-type dopant for MoS2. Our research shows that: the heterojunction exhibits type-Ⅱ band alignment; the band offset can be changed by the out-of-plane polarization direction; doping can modulate the Fermi energy level position of MoS2 and thus further modulate the band alignment and band offset. The α-In2Se3/Nb-doped MoS2 heterojunction is expected to be applied to the field of photodetectors, and we proposed a method to adjust the band alignment of the heterojunction by adjusting the doping concentrations.
Temperature dependence of transport critical current density for REBCO superconducting tapes deposited by MOCVD
Authors: Wang Qianfu , Jiang Ping , Li Meng , Zhao Yaoyao , Zhang Shudong , Zhang Xuefeng , Chen Yimin
Published: November 2023

The temperature-dependent transport critical current density (

J

c

) behavior of REBa2Cu3O7−δ
(REBCO) superconducting tapes with various RE substitutions and combinations has been systematically studied in the temperature range of 4 K–77 K. The measured

J

c

values were found to be highly in accordance with

J

c

T
,
B

=

J

c

(
0

K

,
B
)
(
1
−
T

/

T

c

)

s

with the values of the exponent coefficients s ranging from 1.9 to 2.6 in the magnetic-field range of 1–5 T depending on RE ion(s), revealing the dominative pinning mechanism of flux core pinning. The RE-ionic-radius (r) dependences of

J

c

T
,
B

showed reversed trends for temperatures below and above 50 K, with

J

c

increasing with r at higher temperatures while it decreased with r at lower temperatures, which was consistent with previously reported results. In particular, the in-field

J

c

of REBCO tapes at 4 K as a function of r was consistent with the

J

c

–r trend for low temperatures. We propose to attribute the

J

c

–r trends to the higher charge carrier density and the lower critical transition temperature (

T

c

) in REBCO films with smaller r. The Gd0.5Yb0.5BCO tape with superior

J

c

at low temperatures exhibited the furthest diversion from the

J

c

–r trendlines due to enhanced correlated pinning by the high-density of vertically aligned second-phase nanocolumns in the film. The temperature dependence of

J

c

for REBCO tapes with a larger r was found to be more susceptible to the magnetic field. Meanwhile, the exponent coefficients s showed a more precipitous increase with the increasing magnetic field, partially due to the lack of effective pinning defects, which was also confirmed by the two-dimensional x-ray diffraction patterns and the higher α values. This work contributes to the study of the

J

c

of REBCO superconducting tapes below 20 K and leads to a deeper understanding of the temperature-dependent

J

c

behavior of REBCO films with various RE substitutions and combinations. This provides more comprehensive guidelines for the optimization of RE ions in REBCO for applications at specific temperatures and magnetic fields.
A novel heater-triggered HTS semi-persistent current switch with high switching-off resistance
Authors: Tan Haowen , Huang Zhen
Published: November 2023

A semi-persistent current switch (semi-PCS) with a simple fabrication process, high switching-off resistance, and minimal power dissipation during operation is required to realize the semi-persistent mode in a high-temperature superconducting (HTS) magnet. In this study, a semi-PCS with high switching-off resistance was developed by optimizing the HTS tape structure in a heater-triggered semi-PCS. This optimization was achieved by selectively removing a portion of the conductive and superconducting layers on the surface and edges of the HTS tapes. The microstructure of the treated HTS tape was then analyzed. The resistance of the semi-PCS in a non-superconducting state was measured, and it was connected to an insulated coil for performance testing. To further evaluate its impact, an equivalent electrical circuit model was developed and used to predict the effect of the semi-PCS when applied to a larger superconducting coil. Furthermore, the study explored the impact of the excitation rates on the power dissipation and heat generation of the semi-PCS.
Modeling and investigation of crack evaluation in metal tube based on magnetic field analysis method
Authors: Jiang Feng , Liu Shu Lin
Published: November 2023

In this paper, an analytical model of eddy current testing of a metal tube has been proposed to evaluate circumferential cracks from the signals of the magnetic field. First, based on Maxwell’s equations in time-harmonic form, magnetic vector potential equations for each region of space are built under two different configurations of the bobbin probe and the encircling probe respectively. Next, the magnetic vector potentials are solved by imposing conditions at the interface. Then, series expressions of the radical and axial magnetic induction intensities have been obtained. In addition, based on the proposed modeling, the influences of cracks at different locations on the surface magnetic field have been analyzed. The results have shown that the radial magnetic induction intensity increases while the axial magnetic induction intensity decreases for the internal and external cracks with the same shape and size on the surface of the metal tube. Moreover, the magnetic induction intensity has shown much more sensitive property to external cracks than it has done to internal cracks for the encircling probe. However, for the bobbin probe, the magnetic induction intensity has demonstrated almost the same sensitivity in detection for both internal and external cracks in the metal tube. The researching results have important theoretical and practical significance for understanding the physical process of eddy current testing, optimizing parameters of the experimental system and building the inversion model.
Influence of Vanadium substitution on electronic, thermoelectric and optical response of Cu2O
Authors: Malik Muhammad Kamran Tahir , Fakhr-e-Alam M , Aslam Shamim , Qureshi Muhammad Tauseef , Yunus Ghazala , Al Elaimi Mahmoud , Saleem Murtaza
Published: November 2023

Cu2O semiconductor attained much research interest due to excellent electronic and optical response. In this work, Vanadium-doped Cu2O compositions were studied for electronic, thermoelectric, and optical response using density functional theory. The thin films were experimentally fabricated using the chemically derived spin coating method. The x-ray diffraction analysis revealed the growth of crystalline thin films with cubic structure having space-group 224-Pn-3m. The scanning electron micrographs exhibit the uniform grain growth with well-defined grain boundaries for pure Cu2O films. Density of states spectra display the maxima for O-2p and Cu-3d while V-3d states occupied the conduction band. The value of the experimental band gap for pure Cu2O is estimated as 2.02 eV and found to decrease with V-doping. The Seebeck coefficient and specific heat are found to increase with the increment in V-doping content due to thermal fluctuations. A steady increase is observed in real epsilon with the increase in energy and dopant concentration.
Demonstration of transient CHI startup using a floating biased electrode configuration
Authors: Kuroda K. , Raman R. , Onchi T. , Hasegawa M. , Hanada K. , Ono M. , Nelson B.A. , Rogers J. , Ikezoe R. , Idei H. , Ido T. , Nagata M. , Mitarai O. , Nishino N. , Otsuka Y. , Zhang Y. , Kono K. , Kawasaki S. , Nagata T. , Higashijima A. , Shimabukuro S. , Niiya I. , Sekiya I. , Nakamura K. , Takase Y. , Ejiri A. , Murakami S.
Published: November 2023

Results from the successful solenoid-free plasma startup using the method of transient coaxial helicity injection (transient CHI) in the QUEST spherical tokamak (ST) are reported. Unlike previous applications of CHI on HIT-II and on NSTX which required two toroidal insulating breaks to the vacuum vessel, QUEST uses a first of its kind, floating single biased electrode configuration, which does not use such a vacuum break. Instead, the CHI electrode is simply insulated from the outer lower divertor plate support structure. This configuration is much more suitable for implementation in a fusion reactor than the previous configurations. Transient CHI generated toroidal currents of 135 kA were obtained. The toroidal current during the formation of a closed flux configuration was over 50 kA. These results bode well for the application of transient CHI in a new generation of compact high-field STs and tokamaks in which the space for the central solenoid is very restricted.
Determination of Hydrodynamic Coefficients of Atmospheric Diving Suit
Authors: Chen Ken , Du XinGuang , Cao Yang
Published: November 2023

Atmospheric Diving Suit (ADS) is commonly featured with complex configurations and great difficulty in accurate control. To achieve a satisfying control effect, it is necessary to establish a hydrodynamic formula for ADS. This paper employs the model test method to obtain the ADS hydrodynamic coefficients, providing the foundation for ADS hydrodynamic formula. A 1:1 scale hydrodynamic test model of ADS is designed and machined, and then the hydrodynamic test is carried out. The hydrodynamic coefficients correlated with vertical motion are obtained through a vertical towing test, revealing the hydrodynamic characteristics of the ADS.
Design of Light, Small, and High-precision Digital Servo Clock for LEO Constellation
Authors: Jiang Li , Yan Xu , Xu Wei , Zhao Hancheng
Published: November 2023

Modern low earth orbit (LEO) satellite systems have placed increasingly stringent requirements on spaceborne time-frequency systems in the fields of constellation autonomous management, distributed synthetic aperture radar (SAR) imaging, and navigation time service. Admittedly, the original high-stability constant-temperature crystal oscillator and high-stability temperature-compensated crystal oscillator can no longer comply with the indicator requirements of clock source frequency characteristics and clock synchronization accuracy. Likewise, traditional satellites use atomic clocks (rubidium atomic clocks and cesium atomic clocks). On account of their inherent characteristics, the ground receiving system needs to observe and count the clock parameter characteristics for a long time after the satellite enters orbit and frequently modify the future working state parameters. The features of being expensive and bulky increase the operation and maintenance costs of the ground system and the complexity of engineering implementation. In this paper, a kind of light and small high-precision digital servo clock based on the deep coupling of the global navigation satellite system (GNSS) is designed for the LEO satellite constellation. The tame clock is deeply coupled with the GNSS navigation receiver, and the high precision time-frequency difference between the local clock frequency source and GNSS is obtained by using the carrier and pseudo-range measurement information of visible satellite and carrier phase measurement information of the receiver. It not only utilizes the short-term high stability of OCXO but also employs the long-term time-frequency maintenance ability of GNSS so that the tamed OCXO is locked in GNSS for a long time, which can achieve frequency calibration of local clock sources and long-term output to various space-borne systems. The system is small in size and low in power consumption, with output frequency stability better than 3E-13 (10000 s), accuracy better than ±2E-13, and timing accuracy better than ±10 ns, which is comparable to the key technical indexes of spaceborne miniaturized rubidium clocks, in line with the current demand of miniaturization, low power consumption, and low cost of LEO constellations.
Comparison of the spectral radius of the Schur product
Authors: Zhou Xin
Published: November 2023

This article aims to discuss the spectral radius of the Schur product. We demonstrate that the upper bound of the spectral radius ρ(E ∘ F) in [5] is more precise than the upper bound in [6]. Finally, we verify our findings with a specific example.
An Average Speed of Sound Method for Underwater Positioning Based on Time of Arrival
Authors: Zhao Rongyang , Yang Zhongqiang , Ge Songwei , Wang Mingjuan , Wang Yazhou
Published: November 2023

This article uses the distance and sound spread time of each monitoring base station in the underwater positioning system, calculates the effective sound speed of the sound wave to the base station, and proposes a TOA underwater positioning method based on the average speed. The influence of small underwater sound changes the system positioning accuracy, reducing system positioning errors. Simulation experiments show that compared with the traditional fixed sound velocity method, this method has higher positioning accuracy and lower error. The positioning effect in a long baseline underwater positioning system is less dependent on the number of monitoring base stations. The cumulative probability of positioning error within 5 m can reach 70%, and the cumulative probability of error within 10 m can reach over 95%.
Numerical Study of Self-propulsion Resistance of KCS Based on CFD
Authors: Han Shuo , Yang Linjia
Published: November 2023

In this study, we used computational fluid dynamics (CFD) techniques to conduct self-propulsion tests to evaluate vessel resistance. We conducted self-propulsion calculations on the Korea Research Institute of Vessels and Ocean Engineering (KRISO) container ship (KCS) at a model scale, directly discretizing the propeller and rudder. We used the overset grid method, which allows the propeller to rotate arbitrarily during the calculation process, and used the volume of fluid (VOF) method for multiphase flow to handle the free surface effect. The accuracy of the computational results was verified by comparison with existing experimental data.
Triple-energy virtual monochromatic imaging with a photon-counting detector for reducing metal artifacts in half-beam dental computed tomography
Authors: Lee M. , Lee H. , Lee S. , Kim W. , Lim Y. , Cho H. , Cha B.
Published: November 2023

Dental computed tomography (DCT) is crucial for accurate diagnosis and treatment planning in modern dental care. However, the presence of metal artifacts from dental restorations or implants often compromises the image quality. This study introduces and evaluates a novel technique, triple-energy virtual monochromatic imaging (TEVM), which employs a photon-counting detector (PCD) to enhance image quality. TEVM synthesizes images captured at three distinct energy levels to produce a virtual monochromatic image (VMI) with improved contrast and sharpness, particularly in areas affected by metal artifacts. We compared the efficacy of TEVM in mitigating metal artifacts using half-beam dental and endodontic CT with that of conventional methods. The results indicate that TEVM significantly reduces metal artifacts and improves image quality. In addition, this technique minimizes the need for repeated scans, thereby reducing radiation exposure. In conclusion, TEVM combined with PCD offers a promising avenue for overcoming the challenges posed by metal artifacts in dental and endodontic CT, thereby enhancing both diagnostic accuracy and patient care.
Influence of high fluence heavy ion irradiation on the performance of single crystal diamond detectors
Authors: Wang X. , Li Z. , Li R. , Lu Z. , Chen C. , Liu F. , Ma S. , Wu G. , Li H.
Published: November 2023

Radiation detectors based on diamond are highly favored for
particle physics research due to their superior radiation
hardness. In this work, the performance of single crystal diamond
detectors under high fluence heavy ion radiation has been
investigated. After irradiation by Fe13+ and Xe20+ ion
beams with a high particle fluence of
1.2 × 1015 cm-2, the properties of unirradiated and
irradiated intrinsic single crystal chemical vapor deposition (CVD)
diamond detectors are compared by means of the spectroscopic energy
resolution, charge collection efficiency (CCE), mobility-lifetime
(μτ) product and time response using a 241Am alpha
(α) particle source. The experimental results of the
unirradiated sample with respect to I-V dark current levels, showed
an ohmic behaviour of the Al and Cr/Au contact, CCE of 100%, fast
response with a rise time of 750 ps and a fall time of 600 ps as
well as drift velocities of 6.67 × 104 m/s and
4.72 × 104 m/s for holes and electrons respectively. In
the case of the irradiated samples, the CCE, μτ product and
time response pulse amplitude of holes and electrons were all
degraded, indicating that high density trappings for both kinds of
carriers were created under the diamond crystal surface and the
trapping probability of holes and electrons was equal, which was
different from the previous reports in the literature where only
higher trapping probability of holes were observed under heavy ions
irradiation. In particular, the spectroscopic performance as well as
μτ product of holes and electrons in Fe13+ irradiated
sample decreased more than those in Xe20+ irradiated sample,
which implied that the recombination of electrons and holes
increased in Fe13+ irradiated sample with greater penetration
depth than that in Xe20+ irradiated sample when radiation
fluence was up to 1015 cm-2, despite the lower density of
lattice vacancies in Fe13+ irradiated sample. Moreover, the
rise time of holes was slightly different, but the drift velocity
was basically the same as that of the unirradiated sample, and so
was that of the electrons. Anyway, the presented results showed that
the diamond detectors irradiated by heavy ions at a high fluence of
1015 cm-2 still retained their good spectroscopic and
very fast time response properties.
All linear symmetries of the
SU(3)
tensor multiplicities
Authors: Briand Emmanuel , Rosas Mercedes , Trandafir Stefan
Published: November 2023

The

S
U
(
3
)

tensor multiplicities are piecewise polynomial of degree 1 in their labels. The pieces are the chambers of a complex of cones. We describe in detail this chamber complex and determine the group of all linear symmetries (of order 144) for these tensor multiplicities. We represent the cells by diagrams showing clearly the inclusions as well as the actions of the group of symmetries and of its remarkable subgroups.