bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling method study for transfer matrix of space rigid bodies supported by multiple elastic hinges
Authors: Lu Zhaogang , Qian Dashuai , Kang Weijia , Lu Minyue , Lu Yang 
Published: April 2024

Abstract
When rigid bodies as well as elastic hinges connected are modeled by using a transfer matrix method, they need to be defined as multi-input and multi-output space rigid bodies, resulting in higher dimensions of the whole transfer matrix and complexity of modeling. To reduce the dimensions of the whole matrix and improve computational efficiency and accuracy, the elastic hinges and the rigid bodies are integrated into a unified model in this paper. Then a single 12×12 matrix is obtained through theoretical derivation. The resulting transfer matrix of space rigid bodies supported by multiple elastic hinges not only reduces the dimensions of the whole matrix but also simplifies the configuration of the transfer matrix model by which some tree-like systems can be simplified into chain-like systems. Subsequently, the effectiveness of the matrix is validated through computational comparative analysis of typical systems. The modeling method is an important optimization to the calculation method of the dynamics characteristics of the transfer matrix.
Design and optimization of liquid-cooled plate structure for power battery of the pure electric excavator
Authors: Chen Yunfan , Zhao Hongqiang , Liu Qiang 
Published: April 2024

Abstract
With the increasing pressure of energy transformation and environmental protection, the trend of electrification of construction machinery is becoming more and more obvious. In this paper, based on a small pure electric excavator which is still in the stages of research and development, a liquid-cooled heat dissipation structure (liquid-cooled plate) is designed according to the power battery pack scheme. The overall shape of the liquid-cooled plate is designed as a symmetrical serpentine flow channel. Geometrically, the symmetrical serpentine flow channel is a combination of a straight flow channel and a runway-shaped flow channel. Then the conjugate heat transfer simulation model was established by using the CFD software Ansys Fluent. The results show that the initial scheme can not guarantee the temperature homogeneity of the battery pack. Therefore, the liquid-cooled heat dissipation scheme was optimized and compared. Firstly, a liquid-cooled plate was added on the original basis, and multiple sets of simulations were carried out with the length of the linear flow channel as a variable. The results show that appropriately increasing the length of the straight flow channel at the entrance of the liquid-cooled plate has a marked effect on improving the heat dissipation performance.
Control strategy for power factor correction circuits based on model predictive control
Authors: Wang Shu , Xu Xiaohui , Song Tao , Li Xizhe , Zhu Weilong 
Published: April 2024

Abstract
Power factor correction circuits are being used more extensively, and with that, the requirements and standards have become increasingly stringent. To improve the power factor of the circuit, thereby improving its operational efficiency and mitigating the load effects in boost power factor correction circuits, reducing Total Harmonics Distortion is crucial for improving the quality of the current. An improvement upon the conventional dual-loop PID control algorithm has been proposed. It involves integrating Model Predictive Control into the current loop design and incorporates a Luenberger observer. Model Predictive Control methods can be applied for the control of multivariable systems, especially in complex multivariable systems, as they exhibit strong robustness. Finally, by performing both simulation and experimental validations and analyzing the data results, it is shown that under full load conditions, the power factor λ is 0.968, the efficiency η is 91.11%, the voltage total harmonic distortion Uthd
is 1.88%, and the current total harmonic distortion Ithd
is 7.04%. These data results strongly confirm the performance of the control mechanism proposed in this paper.
Study of distribution network loss allocation with high photovoltaic penetration ratio
Authors: Chen Yun , Li Yadi , Liu Jilei , Liu Shipeng , Zhang Jie , Ma Yongfei , Pan Ziyan , Ge Yimeng , Lu Binxian 
Published: April 2024

Abstract
With the rapid development of renewable energy, the penetration ratio of photovoltaic (PV) in the distribution network is getting higher and higher. The fair and reasonable allocation of high loss caused by high PV penetration in the distribution network is of great significance to the healthy development of distribution systems. In order to study the loss allocation in distribution networks with high PV penetration, based on the cooperative game theory, combined with the power flow algorithm, the power flow and loss of the 72-node active distribution network in agricultural and pastoral areas were analyzed. Three scenarios were included: no PV, low PV penetration, and high PV penetration. The allocated loss of the distribution network with high PV penetration and multiple distributed generators was computed. The results show that the loss allocation method, which takes into account the power as well as the network topology, is applicable to distribution networks with multiple distributed generators. In distribution networks with high PV penetration, distributed generators are the main cause of high loss. If the network contains the extreme reverse power flow concerned in this paper, the loss allocated to DGs accounts for more than 95% of the total network power loss.
Off-line location strategy for single-phase ground fault of distribution line
Authors: Li Shengzhu , Yang Ming , Zhao Bing , Huang Yining , Zheng Zimo 
Published: April 2024

Abstract
This paper adopts off-line location strategy of single-phase grounding fault of distribution lines, determines size and frequency of injected AC signal by analyzing distribution parameters of lines, and then develops portable small current signal source with adjustable frequency through power conversion control technology, and develops signal detector by analyzing noise correlation and adaptive morphological filtering. Then off-line location strategy is developed according to above two signal devices. Finally, it is verified that the strategy can accurately locate fault point of distribution line.
Diffusive shock acceleration in relativistic, oblique shocks
Authors: Marle Allard Jan van , Bohdan Artem , Araudo Anabella , Casse Fabien , Marcowith Alexandre 
Published: April 2024

Abstract
Cosmic rays are charged particles that are accelerated to relativistic speeds by astrophysical shocks. Numerical models have been successful in confirming the acceleration process for (quasi-)parallel shocks, which have the magnetic field aligned with the direction of the shock motion. However, the process is less clear when it comes to (quasi-)perpendicular shocks, where the field makes a large angle with the shock-normal. For such shocks, the angle between the magnetic field and flow ensures that only highly energetic particles can travel upstream at all, reducing the upstream current. This process is further inhibited for relativistic shocks, since the shock can become superluminal when the required particle velocity exceeds the speed of light, effectively inhibiting any upstream particle flow. In order to determine whether such shocks can accelerate particles, we use the particle-in-cell (PIC) method to determine what fraction of particles gets reflected initially at the shock. We then use this as input for a new simulation that combines the PIC method with grid-based magnetohydrodynamics to follow the acceleration (if any) of the particles over a larger time-period in a two-dimensional grid. We find that quasi-perpendicular, relativistic shocks are capable of accelerating particles through the DSA process, provided that the shock has a sufficiently high Alfvénic Mach number.
Ookami: An A64FX Computing Resource
Authors: Calder A C , Siegmann E , Feldman C , Chheda S , Smolarski D C , Swesty F D , Curtis A , Dey J , Carlson D , Michalowicz B , Harrison R J 
Published: April 2024

Abstract
We present a look at Ookami, a project providing community access to a testbed supercomputer with the ARM-based A64FX processors developed by a collaboration between RIKEN and Fujitsu and deployed in the Japanese supercomputer Fugaku. We provide an overview of the project and details of the hardware, and describe the user base and education/training program. We present highlights from previous performance studies of two astrophysical simulation codes and present a strong scaling study of a full 3D supernova simulation as an example of the the machine’s capability.
Quasi all-speed schemes for magnetohydrodynamic flows in a wide range of Mach numbers
Authors: Minoshima Takashi 
Published: April 2024

Abstract
We present novel numerical schemes for ideal magnetohydrodynamic (MHD) simulations aimed at enhancing stability against numerical shock instability and improving the accuracy of low-speed flows in multidimensions. Stringent benchmark tests confirm that our scheme is more robust against numerical shock instability and is more accurate for low-speed, nearly incompressible flows than conventional shock-capturing schemes. Our scheme is a promising tool for tackling MHD systems, including both high and low Mach number flows.
Low-regularity exponential-type integrators for the Zakharov system with rough data in all dimensions
Authors: Li Hang , Su Chunmei 
Published: April 2024

We propose and analyze a type of low-regularity exponential-type integrators (LREIs) for the Zakharov system (ZS) with rough solutions. Our LREIs include a first-order integrator and a second-order one, and they achieve optimal convergence under weaker regularity assumptions on the exact solution compared to the existing numerical methods in literature. Specifically, the first-order integrator exhibits linear convergence in

H

m
+
2

(

T

d

)
×

H

m
+
1

(

T

d

)
×

H
m

(

T

d

)

H^{m+2}(\mathbb {T}^d)\times H^{m+1}(\mathbb {T}^d)\times H^m(\mathbb {T}^d)

for solutions in

H

m
+
3

(

T

d

)
×

H

m
+
2

(

T

d

)
×

H

m
+
1

(

T

d

)

H^{m+3}(\mathbb {T}^d)\times H^{m+2}(\mathbb {T}^d)\times H^{m+1}(\mathbb {T}^d)

if

m
>
d

/

2

m>d/2

, meaning that only the boundedness of one additional derivative of the solution is required to achieve the first-order convergence. While for the second-order integrator, we show that it achieves second-order accuracy by requiring the boundedness of two additional spatial derivatives of the solution. The order of additional derivatives required is reduced by half compared to the classical trigonometric integrators. The main techniques to design the integrators include a reformulation by introducing new variables to exclude the loss of spatial regularity in the original ZS, accurate integration for the dominant term in the linear part of the equations and appropriate approximations (or averaging approximations) to the exponential phase functions involving the nonlinear interactions. Numerical comparisons with classical integrators confirm that our newly proposed LREIs are superior in accuracy and robustness for handling rough data.
Simultaneous Rhinoplasty and Septal Perforation Repair Using the Bone-Cartilaginous Unit
Authors: Sazgar Amir A , Sazgar Mehr A , Zarringhalam Mohammad A , Sazgar Amir K 
Published: April 2024

Abstract

Background
Various techniques are employed for septal perforation repair but success rates still vary. Numerous mucosal flaps are used for septal perforation closure; however, a scaffold is essential for proper positioning and enhanced mucosal growth.

Objectives
The aim of this study was to assess the effectiveness of utilizing a septal bone/cartilage composite graft (BC unit) to close septal perforations in rhinoplasty patients and evaluate patient satisfaction.

Methods
This case series included patients with septal perforation undergoing rhinoplasty and perforation repair between 2019 and 2023. BC units were used to cover the cartilaginous perforations in all patients. Patients were followed for a minimum of 1 year, assessing surgical results and postoperative satisfaction with the 10-item Standardized Cosmesis and Health Nasal Outcomes Survey (SCHNOS).

Results
In this study, 31 patients (22 female, 9 male), with a mean [standard deviation] age of 34.80 [10.31] years (range, 19-59 years), were enrolled. Nine had previousl undergone septoplasty, while four had undergone septorhinoplasty. The preoperative perforation size ranged from 6 to 27 mm (mean, 14.1 mm). At final follow-up, 26 cases (83.8%) achieved complete closure, while 3 had incomplete closures, and 2 experienced reperforation. Analysis revealed a notable mean decrease of 31.93 [26.47] in obstruction domain scores (SCHNOS-O) and a mean decrease of 44.19 [25.37] in cosmesis domain scores (SCHNOS-C).

Conclusions
Septal perforation repair and rhinoplasty can be safely and effectively performed concurrently with BC units for suitable candidates.

Level of Evidence: 3
Dynamic dichromatism and effects of high temperatures on male coloration plasticity in an ectotherm model
Authors: Rossi Nicola , Chiaraviglio Margarita , Cardozo Gabriela 
Published: April 2024

Abstract
Climate change is increasing the temperatures of wild environments, but the impacts on evolutionary ecological processes, such as sexual selection, are still under-studied. In ectotermic tetrapods, male coloration is a pivotal trait in social contexts. During the reproductive season, males can enhance the dichromatic coloration of certain body regions. However, it is unknown how reproductive dichromatism might interact with the increasing temperatures that cause body temperatures to fall within the upper range of preferred temperatures. We hypothesize that sexual dichromatism could be dynamic, i.e. show changes, being reinforced during the reproductive period of the species. However, high temperatures associated with climate change could disrupt reproductive colour patterns by inducing plastic changes. We test this in the social lizard species Tropidurus spinulosus in a laboratory setting by applying three thermal treatments: one reproducing current thermal conditions and two simulating scenarios of climate change. Our results highlight that male coloration is enhanced during the reproductive season in key body regions for social displays. At the preferred temperature of the species, males could darken their ventral coloration; however, no such change was observed at high temperatures. Therefore, increasing temperatures could impact the capacity of males to adjust their coloration plastically during the reproductive season.
One more word on Patagonian Ulota macrodontia: Ulota brachypoda sp. nov. (Orthotrichaceae, Bryophyta)
Authors: Matanov Nikolay , Draper Isabel , Calleja Juan Antonio , Flagmeier Maren , Lara Francisco , Garilleti Ricardo 
Published: April 2024

Abstract
The bryophyte genus Ulota has its main diversification area in Patagonia, with 18 currently accepted species, all of which are endemic to the area. Despite this richness, ongoing studies indicate the existence of hitherto unknown species in this territory. However, the strong resemblance between species often complicates the discrimination of new taxa, making the use of integrative taxonomy approaches compulsory. During surveys conducted in past decades, a morphotype of a Ulota, closely resembling Ulota macrodontia, was discovered coexisting with this species. Ulota macrodontia is characterized by unique peristomial features within the genus, and the variant morphotype shares these characteristics while displaying some distinct gametophytic and sporophytic features. Biometric analyses demonstrate that the differences are stable, and without intermediate states. The results obtained from the analyses of one nuclear and four plastid loci reveal a close relationship between both morphotypes, with the samples of U. macrodontia forming a well-supported monophyletic group. We propose to treat the new morphotype at species level (Ulota brachypoda sp. nov.), discussing why this is the most appropriate taxonomic rank, and we provide a detailed and illustrated description. Additionally, a distribution map of the two endemics is included.
Facile preparation of SeCF3-substituted alkenes from alkenyl iodides and selenium powder
Authors: Matsui Haruka , Kojima Yuki , Hirano Koji 
Published: April 2024

Abstract
A synthetic method of SeCF3-substituted alkenes by a copper-mediated trifluoromethylselenolation of alkenyl iodides has been developed. In the presence of CuI and bpy, AgSeCF3 generated in-situ from Ag salt, TMSCF3, and commercially available Se powder, can be successfully coupled with alkenyl iodides to produce the trifluoromethylselenoalkenes with high chemoselectivity. The reaction shows a broad substrate scope including alkenyl iodides derived from biologically active molecules. Moreover, the feasibility of its scale-up synthesis has been demonstrated, thereby underscoring the practicality of the protocol.
Who gets the goods? Disentangling the effects of parliamentary representation and collective action on social spending
Authors: Calnitsky David , Wind Ella 
Published: April 2024

Abstract
A century of activist and academic analysis of the welfare state can be sorted into insider and outsider theories of social change. One perspective argues that working-class and poor people can achieve income redistribution through insider strategies, primarily through the legislative efforts of left-wing political parties. A competing perspective argues that political parties themselves have no inner motor and merely channel the outside pressure from disruptive collective action. This article makes a substantive and methodological contribution to the debate over the generosity of the welfare state. We analyse the extent to which collective action confounds, moderates, or operates independently of left-wing parliamentary power to explain the history of social spending in 22 countries. Our results support a strong version of the insider intuition that the parliamentary road is crucial to winning gains for poor and working people. It does so without channelling the power of mass mobilization: accounting for various forms of collective action does not reduce the impact of left parliamentary representation on public social expenditures. Nonetheless, we do find that strikes, in particular, have independent effects on social spending. These results together provide some support for what can be called a Marxist–social democratic alliance. We also find evidence for the outsider view that protests and riots matter when combined; these mobilizations, like strikes, operate independently of the role of left-wing parliamentary power.
Arctic cyanobacterial mat community diversity decreases with latitude across the Canadian Arctic
Authors: Hooper Patrick M , Bass David , Feil Edward J , Vincent Warwick F , Lovejoy Connie , Owen Christopher J , Tsola Stephania L , Jungblut Anne D 
Published: April 2024

Abstract
Cyanobacterial mats are commonly reported as hotspots of microbial diversity across polar environments. These thick, multilayered microbial communities provide a refuge from extreme environmental conditions, with many species able to grow and coexist despite the low allochthonous nutrient inputs. The visibly dominant phototrophic biomass is dependent on internal nutrient recycling by heterotrophic organisms within the mats; however, the specific contribution of heterotrophic protists remains little explored. In this study, mat community diversity was examined along a latitudinal gradient (55–83°N), spanning subarctic taiga, tundra, polar desert, and the High Arctic ice shelves. The prokaryotic and eukaryotic communities were targeted, respectively, by V4 16S ribosomal RNA (rRNA) and V9 18S rRNA gene amplicon high-throughput sequencing. Prokaryotic and eukaryotic richness decreased, in tandem with decreasing temperatures and shorter seasons of light availability, from the subarctic to the High Arctic. Taxonomy-based annotation of the protist community revealed diverse phototrophic, mixotrophic, and heterotrophic genera in all mat communities, with fewer parasitic taxa in High Arctic communities. Co-occurrence network analysis identified greater heterogeneity in eukaryotic than prokaryotic community structure among cyanobacterial mats across the Canadian Arctic. Our findings highlight the sensitivity of microbial eukaryotes to environmental gradients across northern high latitudes.
Trends in Number and Appropriateness of Prescription Medication Utilization Among Community-Dwelling Older Adults in the United States: 2011–2020
Authors: Pan Shaoxi , Li Shanshan , Jiang Shaoxiang , Shin Jung-Im , Liu Gordon G , Wu Hongyan , Lyu Beini 
Published: April 2024

Abstract

Background
Contemporary data on the quantity and quality of medication use among older adults are lacking. This study examined recent trends in the number and appropriateness of prescription medication use among older adults in the United States.

Methods
Data from the National Health and Nutrition Examination Survey (NHANES) between 2011 and March 2020 were used, and 6 336 adult participants aged 65 and older were included. We examined the number of prescription medication, prevalence of polypharmacy (≥5 prescription drugs), use of potentially inappropriate medication (PIM), and use of recommended medications (angiotensin-converting enzyme inhibitor [ACEI]/angiotensin receptor blockers [ARBs] plus beta-blockers among patients with heart failure and ACEI/ARBs among patients with albuminuria).

Results
There has been a slight increase in the prevalence of polypharmacy (39.3% in 2011–2012 to 43.8% in 2017–2020, p for trend = .32). Antihypertensive, antihyperlipidemic, antidiabetic medications, and antidepressants are the most commonly used medications. There was no substantial change in the use of PIM (17.0% to 14.7%). Less than 50% of older adults with heart failure received ACEI/ARBs plus beta-blockers (44.3% in 2017–2020) and approximately 50% of patients with albuminuria received ACEI/ARBs (54.0% in 2017–2020), with no improvement over the study period. Polypharmacy, older age, female, and lower socioeconomic status were generally associated with greater use of PIM but lower use of recommended medications.

Conclusions
The medication burden remained high among older adults in the United States and the appropriate utilization of medications did not improve in the recent decade. Our results underscore the need for greater attentions and interventions to the quality of medication use among older adults.