bluuebunny/crossref_metadata_2025 huggingface dataset:
An Experience in Laboratory Diagnosis of Fungal Infections in COVID -19 Patients
Authors: Boorgula Sushma Yadav , Yelamanchili Sadhana , Sistla Srinivas Kishore , Saher Lubna , Gujjarlapudi Deepika , E. Shalini , V. Sindhu Devi , Duvvur Nageshwar Reddy
Published: September 2023

Introduction Coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has cast a gloom spell on healthcare worldwide, infecting millions of people.

Objective The aim of the present study is to determine the prevalence and review the contributing comorbidities and the precipitating factors leading to the emergence of the fungal infections in COVID-19-affected patients. To assess the utility of different laboratory techniques for confirmation of fungal infections. To assess the strengths and limitations of the diagnostic methods.

Methods We have studied 252 clinical samples obtained from 121 COVID-positive patients.

Results Among the 121 patients clinically diagnosed with fungal infections, 88 had diabetes and were given steroids for treatment (p-value = 0.001). Ninety-five patients (78.5%) had a positive laboratory diagnosis (either culture positive, potassium hydroxide [KOH]-positive or positive histopathology report). Fungal culture was positive in 75 (61.9%) patients and histopathology report was positive in 62 (51.2%). Histopathology was positive in 7 (5.8%) patients in whom culture and KOH were negative.

Conclusion Aggressive treatment methods, administration of immune suppressants, and antibiotics, with an intention to salvage, have made patients susceptible to the benign fungus, causing it to evade the host immunity, thus leading to invasive infections. Applying different laboratory modalities would not only aid in providing fast and valuable information but also help in understanding the pathology which would assist the clinician in selecting the correct treatment for the patient.
The Intersection of Social Determinants of Health and Post-stroke Aphasia Outcomes: A Need for Intersectional Analysis
Authors: Evans Elizabeth , Jacobs Molly , Ellis Charles
Published: September 2023

Aphasia is a disorder that results from damage to portions of the brain that are responsible for language and can vary significantly by type and severity. Differences in aphasia outcomes are influenced by the social determinants of health (SDOH). The SDOH are structural, environmental, and personal determinants that influence health outcomes. Intersectionality, or how one's social and political identities interact to influence individual life outcomes and/or advantage in our society, provides a way to examine the varying levels of the SDOH. However, intersectionality is complex, difficult to measure, and has not yet been explored in post-stroke aphasia outcomes. This article reviews the relationship of race and aphasia outcomes and the SDOH and aphasia outcomes. Additionally, we provide a novel current approach to examine the SDOH and aphasia outcomes. Lastly, we discuss the need for evaluation of intersectionality in aphasia and aim to provide a leveled social–ecological framework to examine aphasia-related outcomes. With notable individual differences among aphasia outcomes, we present a framework to support optimizing research and clinical aphasia care in speech-language pathology.
Evaluation of an Instructional Video and Simulation Model for Teaching Slit Lamp Examination to Medical Students
Authors: Collis Sophia , Yung Madeline , Parikh Neeti
Published: September 2023

Purpose This article assesses the efficacy of an instructional video and model eye simulation for teaching slit lamp exam to medical students as compared to traditional preceptor teaching.

Methods First through 4th year students from the University of California, San Francisco School of Medicine were recruited via email to participate in the study. Students were randomized into two groups. The experimental “model eye” group watched an instructional video on slit lamp exam, spent 10 minutes practicing on the model eye, then practiced for 25 minutes with a student partner. The control “preceptor teaching” group received 25 minutes of in-person preceptor teaching on slit lamp exam, then spent 25 minutes practicing with a student partner. Students were objectively assessed by a blinded grader who scored their examination skills with a 31-item checklist. Qualtrics surveys that measured student perceptions were distributed before and after the intervention.

Results Seventeen medical students participated in the study. Students in the model eye group achieved higher mean objective assessment scores than students in the preceptor teaching group on skills relating to slit lamp set up (1.75, standard deviation [SD] = 0.50 and 1.50, SD = 0.80 out of 2 points, p = 0.03) and on the total score (1.69, SD = 0.6 and 1.48, SD = 0.8 out of 2 points, p < 0.01). Both groups reported a significant increase in their understanding of what a slit lamp is used for (p < 0.01) and in their confidence using a slit lamp (p < 0.01). All students felt their skills improved with the workshop, 94% found the workshop to be useful, and 88% enjoyed the workshop, with no intergroup differences on these metrics.

Conclusion An instructional video combined with a simulation model is as effective as traditional preceptor teaching of the slit lamp exam. Such a teaching module may be considered as an adjunct to traditional methods.
Using go-it-alone power to overcome intergovernmental deadlock: national vetoes, credible threats, and multi-speed Europe in the British budgetary rebate crisis
Authors: Schramm Lucas
Published: September 2023

Differentiated integration, and the prospect thereof, is a prominent feature of European integration and policymaking. This article theorizes and demonstrates an explicit link between the threat of differentiated integration and the resolution of major European integration crises. Based on archival sources and secondary literature on differentiated integration, it shows how and why, in June 1984, the United Kingdom and Prime Minister Margaret Thatcher agreed to increase the European Community’s (EC) financial resources, despite their years-long insistence on budgetary restraint and their formal right to veto such a decision. The article argues that the prospect of a ‘multi-speed’ Europe, represented by Franco-German ‘go-it-alone’ power, threatened to exclude recalcitrant member states. Lacking more promising alternatives to continued membership in a reformed EC, the British government consented to European financial objectives. It also joined the other national governments towards deeper political integration and, eventually, a European Union, despite its actual rejection of European federal ambitions. The article’s theoretical expectations and empirical findings on ways to overcome intergovernmental deadlock based on formal national veto rights have broader implications also for more recent European integration crises.
Neisseria gonorrhoeae positivity in contacts presenting to a sexual health centre
Authors: Bromley T. , Sundran D. , Khaw C. , Ratnayake M.
Published: September 2023

Background Concerns regarding antimicrobial resistance and the appropriate use of antibiotics have resulted in many sexual health clinics moving away from the epidemiological treatment of contacts of gonorrhoea. The aim of this study was to inform decision-making regarding patients who are contacts who should be given epidemiological treatment. Methods This is a retrospective study of positivity rates of symptomatic and asymptomatic contacts of gonorrhoea who attended the Adelaide Sexual Health Centre from 1 January 2018 to 31 December 2019. Relevant demographic and behavioural characteristics were examined. Non-parametric continuous data were examined as medians and interquartile ranges, and categorical variables were examined as proportions and percentages. Chi-squared tests were used to determine any statistically significant differences in the proportions of participants testing positive to gonorrhoea based on the categorical variables. Results A total of 402 clients were identified as contacts, of which 124 (30.8%) tested positive for gonorrhoea. Women were statistically more likely to test positive than men (27/56 (48.2%) of women vs 96/345 (27.8%) of men (P = 0.002), 0/1 transgender female). From a total of 76 heterosexual men, 14 (18.4%) tested positive as contacts, compared to 82/269 (30.5%) of bisexual/MSM (P = 0.038). Of the 214 asymptomatic bisexual/MSM, 55 (25.7%) were positive, 2/56 (3.6%) asymptomatic heterosexual men were positive and 10/29 (34.5%) asymptomatic females were positive for gonorrhoea. Conclusion This study identifies some demographic and behavioural characteristics that may be associated with a higher rate of gonorrhoea positivity as a contact, particularly females and MSM. Careful consideration may be required as to who should be given epidemiological treatment to ensure appropriate and judicious use of antibiotics.
α-lipoic acid ameliorates consequences of copper overload by up-regulating selenoproteins and decreasing redox misbalance
Authors: Kabin Ekaterina , Dong Yixuan , Roy Shubhrajit , Smirnova Julia , Smith Joshua W. , Ralle Martina , Summers Kelly , Yang Haojun , Dev Som , Wang Yu , Devenney Benjamin , Cole Robert N. , Palumaa Peep , Lutsenko Svetlana
Published: September 2023

α-lipoic acid (LA) is an essential cofactor for mitochondrial dehydrogenases and is required for cell growth, metabolic fuel production, and antioxidant defense. In vitro, LA binds copper (Cu) with high affinity and as an endogenous membrane permeable metabolite could be advantageous in mitigating the consequences of Cu overload in human diseases. We tested this hypothesis in 3T3-L1 preadipocytes with inactivated Cu transporter Atp7a; these cells accumulate Cu and show morphologic changes and mitochondria impairment. Treatment with LA corrected the morphology ofAtp7a−/−cells similar to the Cu chelator bathocuproinedisulfonate (BCS) and improved mitochondria function; however, the mechanisms of LA and BCS action were different. Unlike BCS, LA did not decrease intracellular Cu but instead increased selenium levels that were low inAtp7a−/−cells. Proteome analysis confirmed distinct cell responses to these compounds and identified upregulation of selenoproteins as the major effect of LA on preadipocytes. Upregulation of selenoproteins was associated with an improved GSH:GSSG ratio in cellular compartments, which was lowered by elevated Cu, and reversal of protein oxidation. Thus, LA diminishes toxic effects of elevated Cu by improving cellular redox environment. We also show that selenium levels are decreased in tissues of a Wilson disease animal model, especially in the liver, making LA an attractive candidate for supplemental treatment of this disease.
Numerics of Bianchi type II and type IX spacetimes in effective loop quantum cosmology
Authors: Blackmore Timothy , Wilson-Ewing Edward
Published: September 2023

We numerically determine the effective loop quantum cosmology (LQC) dynamics for the vacuum Bianchi type II and type IX spacetimes, in particular studying how the Kasner exponents evolve across the LQC bounce. We find that when the spatial curvature is negligible at the bounce then the Kasner exponents transform according to the same simple equation as for a Bianchi type I spacetime in effective LQC, while there are departures from this transformation rule in cases where the spatial curvature is significant during the bounce. We also use high-precision numerics to compute the evolution of a Bianchi type IX spacetime through multiple bounces and recollapses, and find indications of chaotic behavior. Interestingly, the numerics indicate that it is during the classical recollapse, and not the LQC bounce, that nearby solutions diverge most strongly.
Regularized factorization method for a perturbed positive compact operator applied to inverse scattering
Authors: Harris Isaac
Published: September 2023

In this paper, we consider a regularization strategy for the factorization method when there is noise added to the data operator. The factorization method is a qualitative method used in shape reconstruction problems. These methods are advantageous to use due to the fact that they are computationally simple and require little a priori knowledge of the object one wishes to reconstruct. The main focus of this paper is to prove that the regularization strategy presented here produces stable reconstructions. We will show this is the case analytically and numerically for the inverse shape problem of recovering an isotropic scatterer with a conductive boundary condition. We also provide a strategy for picking the regularization parameter with respect to the noise level. Numerical examples are given for a scatterer in two dimensions.
The influence of photothermal effect on the resonance frequency of fused silica micro hemispherical resonator
Authors: Wang Yalong , Hu Youwang , Zheng Haoning , Mei Silong , Sun Xiaoyan , Duan Ji’an
Published: September 2023

Micro-electro mechanical system resonant gyroscope plays a more and more important role in inertial navigation. As a core sensing component of micro resonant gyroscope, fused silica micro hemispherical resonator (FS-MHR) is widely concerned because of its great performance potential. The resonance frequency is one of the important characteristic parameters of micro resonators, and laser vibration measurement technology is often used for high-precision measurement of this parameter. During the measurement process, it is inevitably affected by the interference of some light sources. To explore how light affects the resonance characteristics of FS-MHR, this paper establishes a relevant theoretical model; and verifies and analyzes the influence of the photothermal effect on the resonance characteristics of FS-MHR through simulation and experiment. Revealed the trend of temperature and resonance frequency changes over time under the same lighting conditions for uncoated and metal-coated films. The measured data shows that the resonance frequency of FS-MHR coated with the metal film is more susceptible to the influence of the photothermal effect. After 60 s of illumination, the resonance frequency will increase by 6.13 Hz, and frequency splitting will also cause a deviation fluctuation of 2.35 Hz under continuous illumination. This will introduce certain errors in the measurement results, and corresponding measures need to be taken to avoid interference from the light source.
Birth–death dynamics for sampling: global convergence, approximations and their asymptotics
Authors: Lu Yulong , Slepčev Dejan , Wang Lihan
Published: September 2023

Motivated by the challenge of sampling Gibbs measures with nonconvex potentials, we study a continuum birth–death dynamics. We improve results in previous works (Liu et al 2023 Appl. Math. Optim.
87 48; Lu et al 2019 arXiv:1905.09863) and provide weaker hypotheses under which the probability density of the birth–death governed by Kullback–Leibler divergence or by χ
2 divergence converge exponentially fast to the Gibbs equilibrium measure, with a universal rate that is independent of the potential barrier. To build a practical numerical sampler based on the pure birth–death dynamics, we consider an interacting particle system, which is inspired by the gradient flow structure and the classical Fokker–Planck equation and relies on kernel-based approximations of the measure. Using the technique of Γ-convergence of gradient flows, we show that on the torus, smooth and bounded positive solutions of the kernelised dynamics converge on finite time intervals, to the pure birth–death dynamics as the kernel bandwidth shrinks to zero. Moreover we provide quantitative estimates on the bias of minimisers of the energy corresponding to the kernelised dynamics. Finally we prove the long-time asymptotic results on the convergence of the asymptotic states of the kernelised dynamics towards the Gibbs measure.
Quantum interactions in topological R166 kagome magnet
Authors: Xu Xitong , Yin Jia-Xin , Qu Zhe , Jia Shuang
Published: September 2023

Kagome magnet has been found to be a fertile ground for the search of exotic quantum states in condensed matter. Arising from the unusual geometry, the quantum interactions in the kagome lattice give rise to various quantum states, including the Chern-gapped Dirac fermion, Weyl fermion, flat band and van Hove singularity. Here we review recent advances in the study of the R166 kagome magnet (RT6E6, R = rare earths; T = transition metals; and E = Sn, Ge, etc) whose crystal structure highlights the transition-metal-based kagome lattice and rare-earth sublattice. Compared with other kagome magnets, the R166 family owns the particularly strong interplays between the d electrons on the kagome site and the localized f electrons on the rare-earth site. In the form of spin-orbital coupling, exchange interaction and many-body effect, the quantum interactions play an essential role in the Berry curvature in both the reciprocal and real spaces of R166 family. We discuss the spectroscopic and transport visualization of the topological electrons hosted in the Mn kagome layer of RMn6Sn6 and the various topological effects due to the quantum interactions, including the Chern-gap opening, the exchange-biased effect, the topological Hall effect and the emergent inductance. We hope this work serves as a guide for future explorations of quantum magnets.
Traveling spiral wave chimeras in coupled oscillator systems: emergence, dynamics, and transitions
Authors: Bataille-Gonzalez M , Clerc M G , Knobloch E , Omel’chenko O E
Published: September 2023

Systems of coupled nonlinear oscillators often exhibit states of partial synchrony in which some of the oscillators oscillate coherently while the rest remain incoherent. If such a state emerges spontaneously, in other words, if it cannot be associated with any heterogeneity in the system, it is generally referred to as a chimera state. In planar oscillator arrays, these chimera states can take the form of rotating spiral waves surrounding an incoherent core, resembling those observed in oscillatory or excitable media, and may display complex dynamical behavior. To understand this behavior we study stationary and moving chimera states in planar phase oscillator arrays using a combination of direct numerical simulations and numerical continuation of solutions of the corresponding continuum limit, focusing on the existence and properties of traveling spiral wave chimeras as a function of the system parameters. The oscillators are coupled nonlocally and their frequencies are drawn from a Lorentzian distribution. Two cases are discussed in detail, that of a top-hat coupling function and a two-parameter truncated Fourier approximation to this function in Cartesian coordinates. The latter allows semi-analytical progress, including determination of stability properties, leading to a classification of possible behaviors of both static and moving chimera states. The transition from stationary to moving chimeras is shown to be accompanied by the appearance of complex filamentary structures within the incoherent spiral wave core representing secondary coherence regions associated with temporal resonances. As the parameters are varied the number of such filaments may grow, a process reflected in a series of folds in the corresponding bifurcation diagram showing the drift speed s as a function of the phase-lag parameter α.
Optimizing state-discrimination receivers for continuous-variable quantum key distribution over a wiretap channel
Authors: Notarnicola M N , Jarzyna M , Olivares S , Banaszek K
Published: September 2023

We address a continuous-variable quantum key distribution protocol employing quaternary phase-shift-keying of coherent states and a non-Gaussian measurement inspired by quantum receivers minimizing the error probability in a quantum-state-discrimination scenario. We consider a pure-loss quantum wiretap channel, in which a possible eavesdropper is limited to collect the sole channel losses. We perform a characterization of state-discrimination receivers and design an optimized receiver maximizing the asymptotic secure key rate (SKR), namely the key-rate optimized receiver (KOR), comparing its performance with respect to the pretty good measurement and the heterodyne-based protocol. We show that the KOR increases the SKR for metropolitan-network distances. Finally, we also investigate the implementations of feasible schemes, such as the displacement feed-forward receiver, obtaining an increase in the SKR in particular regimes.
Scaling of errors in digitized counterdiabatic driving
Authors: Hatomura Takuya
Published: September 2023

We study errors caused by digitization of shortcuts to adiabaticity by counterdiabatic driving. We find possibility of error scaling

O

(

M

−
2

)

with the number of time slices M, whereas worse error scaling

O

(

M

−
1

)

is predicted in the conventional theory of the first-order Suzuki-Trotter decomposition. We point out this possibility by considering a state-dependent error bound and confirm emergence of this error scaling

O

(

M

−
2

)

by numerical simulation. Moreover, we numerically show that intermediate error scaling can be observed in digitization of approximate counterdiabatic driving. These results reveal usefulness of digitized counterdiabatic driving from the viewpoints of both cost and performance.
Synchronization of discrete time fractional order neuromuscular models in the presence and absence of stimulus
Authors: Vignesh D , Fataf NAA , Abdul Rahim M F
Published: September 2023

This article proposes a fractional order discrete-time neuromuscular model incorporating calcium kinetics to study the essential role of the neuromuscular system in facilitating rapid information transmission between nerve cells and muscles for bodily functions. The study conducts a dynamical analysis to investigate the stability and periodic oscillations of the system in the presence and absence of tetanus stimuli from neurons. Bifurcation diagrams are generated for different fractional orders and rate constants, highlighting the occurrence of chaotic dynamics. The region of chaos is determined using the largest Lyapunov exponents and the Jacobian matrix method. The study also achieves synchronization of the systems by employing nonlinear control functions with feedback gains. Emphasizing the significance of constructing the biological model using fractional order operators, the article provides a chemical interpretation of the analytical findings. Moreover, the article employs dynamic plots to visually depict the changing system variables over time, allowing for an examination of the concurrent presence of multiple attractors through bifurcation diagrams and phase plane portraits. By studying how chemical kinetics and muscle activation are interrelated, the article uncovers captivating revelations that could guide the formulation of strategies to combat muscle disorders. The article also underscores the potential utility of synchronization in managing neuromuscular conditions, thus emphasizing its practical implications in disease control.
Enhancing pinning ability by the addition of potassium niobate nanorods in YBCO superconductor
Authors: Kumar Gaurav , Dahiya Mamta , Khare Neeraj
Published: September 2023

In the current study, we have investigated the effect of adding potassium niobate (KNbO3) nanorods (NRs) in YBCO superconductor to improve flux pinning properties. The KNbO3-NRs are synthesized by hydrothermal method, and KNbO3-YBCO nanocomposites are prepared by incorporating variable amounts of the NRs in YBCO matrix by solid-state reaction method. X-ray diffraction (XRD) pattern confirmed the orthorhombic phase of YBCO, KNbO3-NRs, and KNbO3-YBCO nanocomposite samples. The morphology and composition of the YBCO, KNbO3, and KNbO3-YBCO nanocomposites are studied using field emission scanning electron microscopy (FESEM) and energy-dispersive x-ray spectroscopy (EDX). Magnetic measurements of KNbO3-YBCO nanocomposites are carried out at temperatures from 15 to 65 K under an external magnetic field from -7 to + 7 T. The value of critical temperature (TC0) in xKNbO3-YBCO nanocomposites showed no significant decrease from the TC0 value obtained for YBCO, indicating that inserting a modest amount of KNbO3-NRs into the YBCO matrix does not result in substantial changes in TC0. The critical current density (JC) showed an enhancement of ∼ 3.6 times in 0.5wt%KNbO3-YBCO nanocomposite compared to YBCO. Additionally, when the concentration of KNbO3-NRs in YBCO was raised, the critical current density (JC) decreased due to the accumulation of KNbO3-NRs at the interfaces between grain boundaries. The rate of JC decay decreases as the externally applied field increases for nanocomposite samples compared to YBCO, showing an improvement in the pinning properties of nanocomposites.
Optimal design of relativistic stellar models
Authors: Haggag Salah
Published: September 2023

A new approach to construct relativistic stellar models is presented. The problem is formulated as an optimal control problem, with an objective function to be optimized. As illustration, the problem is formulated and solved, with the rest mass as the objective function to be minimized, in three cases. First, if the density is piece-wise continuous the optimal solution is the spherical shell. Second, if the density gradient is piece-wise continuous the optimal solution has constant density. Third, if the speed of sound does not exceed that of light, the optimal solution has a linear equation of state. Thus, using this new approach, the equation of state is determined by a physical motivation. Results support the suggestion that the linear equation of state could represent a relativistic incompressible fluid. Extensions to some other configurations are explored.
Seeking and sharing information in collective olfactory search
Authors: Panizon Emanuele , Celani Antonio
Published: September 2023

Searching for a target is a task of fundamental importance for many living organisms. Long-distance search guided by olfactory cues is a prototypical example of such a process. The searcher receives signals that are sparse and very noisy, making the task extremely difficult. Information-seeking strategies have thus been proven to be effective for individual olfactory search and their extension to collective search has been the subject of some exploratory studies. Here, we study in detail how sharing information among members of a group affects the search behavior when agents adopt information-seeking strategies as Infotaxis and its recently introduced variant, Space-Aware Infotaxis. Our results show that even in absence of explicit coordination, sharing information leads to an effective partitioning of the search space among agents that results in a significant decrease of mean search times.
Integrable nonlocal PT-symmetric generalized
so(3,R)
-mKdV equations
Authors: Chen Shou-Ting , Ma Wen-Xiu
Published: September 2023

Based on a soliton hierarchy associated with

so
(
3
,
R
)

, we construct two integrable nonlocal PT-symmetric generalized mKdV equations. The key step is to formulate two nonlocal reverse-spacetime similarity transformations for the involved spectral matrix, and therefore, integrable nonlocal complex and real reverse-spacetime generalized

so
(
3
,
R
)

-mKdV equations of fifth-order are presented. The resulting reduced nonlocal integrable equations inherit infinitely many commuting symmetries and conservation laws.
Study of the gluonic quartic gauge couplings at muon colliders
Authors: Yang Ji-Chong , Guo Yu-Chen , Dong Yi-Fei
Published: September 2023

The potential of muon colliders opens up new possibilities for the exploration of new physics beyond the Standard Model. It is worthwhile to investigate whether muon colliders are suitable for studying gluonic quartic gauge couplings (gQGCs), which can be contributed by dimension-8 operators in the framework of the Standard Model effective field theory, and are intensively studied recently. In this paper, we study the sensitivity of the processμ+μ−→jjνν¯to gQGCs. Our results indicate that the muon colliders with c.m. energies larger than 4 TeV can be more sensitive to gQGCs than the Large Hadron Collider.
Impact of fast ions on microturbulence and zonal flow dynamics in HL-2A internal transport barriers
Authors: Xu J.Q. , Peng X.D. , Chen W. , Hao G.Z. , Li J.Q. , Qu H.P. , Li Z.J. , He X.X. , Li Y.G. , Jiang M. , Yu X. , Wen J. , Yang Z.C. ,   the HL-2A Team
Published: September 2023

The turbulent transport properties and dynamics of zonal flows (ZFs) in the presence of fast ions (FIs) are investigated for a typical internal transport barrier (ITB) plasma based on the gyrokinetic approach, focusing on the role of FI temperature and the effects of the toroidal rotation, including the E× B rotational shear, parallel velocity gradient (PVG) as well as the rotation velocity itself. Linear GENE simulations have shown that the core ITB plasma on HL-2A is dominated by ion temperature gradient (ITG) modes and trapped electron modes (TEMs), where the former is stabilized by FIs whereas destabilized by the PVG. Neither of the FIs or the PVG has observable effect on TEMs. The ion heat transport generally decreases at large FI temperature due to the nonlinear electromagnetic stabilization of turbulence with increased total plasma β until electromagnetic modes are excited. The transport fluxes peak around a certain FI temperature and the ZF shearing rate is significantly higher at such value compared with that in the absence of FIs, and the heat flux reduction is a result of the synergistic interaction between turbulence, ZFs and the external rotational shear. The E× B shear stabilizing and PVG destabilizing is not obvious at low normalized ITG R/L
Ti, indicating they are less important in determining the stiffness level in the relatively low density and rotation scenarios regarding the HL-2A ITB discharges. The turbulence suppression is predominated by the nonlinear stabilization of ITG turbulence as well as enhanced ZFs simultaneously in the presence of FIs. These results have also provided the possible way to reduce the turbulence transport through increasing the FI temperature in the off-axis neutral beam heated plasmas such as in HL-2A.
Taser - Stungun Semi-Automatic Advanced Security System Concept Test for Volvo FH - 12
Authors: Rojas Ruben Gregorio Ricra , Huánuco Franklin Javier Gutiérrez , Huamanchahua Deyby
Published: September 2023

Truck theft in Peru is ranked among the 10 most dangerous countries in the world. In that sense, the registered cases of vehicle theft in the year 2012 were a total of 16 357 and in the year 2019 was 20 159 stolen vehicles increasing a percentage of 18.89% in only 7 years. This paper shows as an objective, the development of the Proof of Concepts of an Advanced Security System Taser - Stungun semi-automatic for Volvo FH - 12. In this system, a TTL device (PIC) is used as hardware and a voltage booster from 5v to 5000v generating protection for the easiest and most valuable parts to steal. The proof of concept is activated by the user by buttons and sensors assigned for the protection of the truck, since the installed devices will be aesthetically located in the truck to not be found by the thief, besides being very reliable so that the driver can use it, also in its installation. The prototype will use a shock as self-defense since the system will generate an electric shock of 10 mA with a frequency of 2 seconds, which can immobilize or temporarily paralyze the thief. Therefore, it will analyze the alternatives with the help of the morphological matrix to choose the ideal solution, then we will design the electrical circuit, the programming in pseudocode, validating the proof of concepts, and the selection of the insulator. Finally, it must consider the correct selection of sensors and actuators thus allowing security reliability in different circumstances of the theft.
COMSOL Simulation of the Storage Life of Zinc-silver Reserve Battery
Authors: Tang Jun
Published: September 2023

We deduced the reaction kinetic equation of negative electrode zinc and oxygen at room temperature, and the solid-state reaction kinetics of AgO and silver, established the corresponding COMSOL model, verified and simulated the storage and discharge model, and predicted that the storage life of zinc-silver reserve battery is about 18-20 years.
Fault Warning Technology of Comprehensive Energy System Based on Digital Twins
Authors: Yao Jianhua , Chen Jieguang , Yan Huaizhe , Li Jingyu , Shen Chao , Huang Shenhai
Published: September 2023

The traditional energy industry has many problems, such as huge losses and non-renewability. With the development of informatization and digitalization, integrated smart energy systems have become a current research hotspot. At present, the research on integrated smart energy is still in the theoretical stage, and the fault warning part for integrated smart energy is still very scarce. Therefore, this article proposes a comprehensive energy failure warning technology based on digital twins. Firstly, the comprehensive energy system based on digital twins is divided into five layers, and the SOM algorithm is used to analyze the system’s status data for fault warning. Finally, the superiority of the proposed method was verified through experiments.
Optimal Dispatching of Energy Hub for New Energy Consumption
Authors: Liang Shuchao , Zhai Baoyu , Zhang Long , Li Xing , Xu Zhi , Li Zian
Published: September 2023

In recent years, with the continuous increase of wind power installed capacity, due to insufficient flexibility of the system, there has been a serious problem of wind power abandonment. In response to this phenomenon, this article improves the flexibility of the regional energy system by adding various flexible devices. Based on the concept of an energy hub, an energy hub model including wind power, CHP, heat pumps, heat storage, and other equipment is established. On this basis, considering system operating costs, wind abandonment penalty costs, and electricity purchase costs, a multi-objective regional energy system flexibility configuration model based on energy hubs was established to explore the feasibility of this model in improving wind power consumption. Finally, specific examples were combined in two different cases for analysis. The results indicate that the model has a very good effect on improving system flexibility and improving wind power consumption rate.
Distributed PV Location Selection Based on Hierarchical Optimization and Improved Genetic Algorithm
Authors: Cai Qiuna , Wu Guobing , Dong Kai , Zhao Yue , Chen Zhongfei , Xiao Yu
Published: September 2023

With the rapid development of Distributed Photovoltaic (DPV), the photovoltaic installed capacity of 10 kV and below is gradually increasing, and location selection and capacity planning are required to reduce the impact on the distribution network after the photovoltaic grid connection. Aiming at the access problem of distributed PV in distribution lines, the location and the capacity of DPV are optimized with the idea of layered optimization. The upper level uses improved GA to optimize regional DPV capacity, and the lower layer uses Matlab and OpenDSS to combine multi-objective optimization with minimum network loss and voltage offset and timing power flow calculation to optimize the location and capacity of the DPV within the region. A 10 kV line in Hainan is taken as an example to verify the feasibility of the model.
A Control Method for Output Voltage Stability of Proton Exchange Membrane Fuel Cells
Authors: Liang Xiaojun , Liu Jun , Zheng Wei , Zhang Tianbao
Published: September 2023

The widely used PEMFC (Proton Exchange Membrane Fuel Cell) analysis found that when the REMFC load is changed, its instantaneous output voltage fluctuates, and it causes voltage loss. The main reason is that it is activated by activation. The characteristics of the three-proton exchange membrane fuel battery characteristics of Ohm overvoltage and thickness cause voltage loss. By using the corresponding empirical formula in the Matlab / Simulink environment, the study designs the PID and the Fuzzy PID Controllers. After the established dynamic model of PEMFC, it controls the hydrogen supply module, changes the ratio of hydrogen and oxygen input, and indirectly controls the output voltage. Through experiments, it was found that Fuzzy PID Controller can achieve faster and smoother voltage stability than an ordinary PID Controller and less overshoot when load change, The controller can control the system voltage to reach a set point and to stabilize the supply voltage for the load.
Analysis of the inhomogeneous LPG-air flow field in a tube containing mixed obstructions
Authors: Gao Jianfeng , Wu Yang , Shao Xiaojun , Han Yanan , Guo Bingang , Liang Jianjun
Published: September 2023

Based on numerical simulation, this paper further investigates the flow field structure near the obstacle during the premixed gas deflagration. In the deflagration flow field, the pressure gradient variation and vortex structure intensity in the upper surface region of the obstacle are larger, indicating that the pressure gradient has a stronger effect on the vortex structure. The changes in density gradients and pressure gradients induced by the combined rectangular, flat barrier configuration will be more pronounced than in the model with only flat barriers. This change in turn acts back on the combustion field, which in turn has a strong perturbative effect on the flame.
Research on energy flexibility demand analysis and evaluation method of power systems with a high proportion of new energy
Authors: Sun Wei , Lu Zhaojun , Wang Hongwei , Zhang Wen , Liu Zirui , Shu Jun
Published: September 2023

With the increase of the scale of highly uncertain power supply in the system, the system needs more and more energy flexibility. Existing studies focus more on short-term energy demand volatility changes and lack quantitative means to analyze the system’s demand for energy flexibility at different time scales. Aiming at the above problems, this paper proposes an energy flexibility demand analysis and evaluation method for power systems with a high proportion of new energy. It constructs an energy flexibility demand evaluation index system at different time scales. Combined with the analysis of domestic provincial cases, the results verify the effectiveness of the proposed method.
Application study of the power control system for air-cooled proton exchange membrane fuel cell based on fuzzy adaptive with heuristic adaptive period strategy
Authors: Gan Zhenning , Liu Zhi , Deng Zhijun , Zhao Chen
Published: September 2023

As a zero-emission, non-polluting power generation device, hydrogen fuel cells are of great interest to the global industry with the advantages of high-power generation efficiency, wide source, and wide application scenarios. Influenced by various factors, it leads to a complex fuel cell control system and unstable output characteristics, which is one of the difficulties in the current technology development. In this section, an embedded power control system according to an STM32 microcontroller is developed to improve the steady-state characteristics of cathode open air-cooled fuel cell (PEMFC), and a fuzzy adaptive PID control algorithm according to the heuristic adaptive strategy of time interval is proposed. The control system achieves real-time detection of operating status. It maintains the stable output of cathode open air-cooled PEMFC by predicting vehicle speed in real-time to precisely control the hydrogen supply and external additional fans to control the operating temperature by the control strategy.
Multi-time Scale Coordinated Optimization Scheduling Considering Flexible Resources
Authors: Song Mingshu , Su Changsheng , Gao Guangmang , Xu Xinyu , Zhu Qing , Zhang Siwen , Wu Maoqian , Ma Lei
Published: September 2023

With the growth of new energy installations such as wind power and photovoltaic, the contradiction between supply and demand balance in the power system is becoming increasingly prominent, mainly reflected in the abandonment of new energy, deep peak shaving of units, and Primary Frequency Regulation of units. This article proposes a multi-time scale optimization scheduling strategy that considers multi-link flexible resources. It aims to promote the consumption of clean energy, enhance the flexibility of the power system, and promote the coordinated operation of different time scales. Firstly, the operational characteristics of the power system at different time scales were analyzed, and the current situation and problems of deep peak shaving and Primary Frequency Regulation were analyzed. Secondly, an optimization model was established with the goal of minimizing system operating costs and new energy waste electricity, which includes three stages: weekly optimization, daily optimization, and real-time optimization. Finally, an IEEE-30 node network structure was used for example verification, and the results showed that the proposed scheduling mode could effectively improve system flexibility.
The potential of load identification and regulation in the textile industry
Authors: Cai Yuqing , Zhu Lingling , Ye Qiang , Hu Zeyan , Chen Wuxiao , Zhang Chenhan
Published: September 2023

Firstly, this paper introduces the daily load characteristics and annual load characteristics of the textile industry and points out that the electricity load of the textile industry shows obvious seasonal changes. There is a certain degree of randomness. Then, this paper analyzes the behavior characteristics of electricity consumption in the textile industry, including the behavior mode of electricity consumption and the characteristics of electric equipment. It points out that the textile industry has a certain potential and space in energy utilization. Finally, this paper focuses on the load regulation situation of the textile industry and summarizes the load proportion, regulation mode, regulation time, and adjustable load proportion of the textile industry. This paper studies and discusses the energy utilization and load control of the textile industry, which has certain theoretical and practical significance.
Analysis of the Rectification of Electromagnetic Radiated Emission Performance of a Plug-in Hybrid Mini Truck
Authors: Guo Jiajia , Ren Guiying , Wang Dongsheng , Wang Chong , Wang Zilong , Zhao Mingli , Sun Yanan , Hang Zhou
Published: September 2023

The EMC radiated emission performance of the plug-in hybrid mini truck shall meet the relevant requirements of national standards GB/T 18387-2017 and GB 34660-2017 on the radiation of vehicles. The plug-in hybrid mini truck is placed in a 10 m semi-anechoic chamber for the whole vehicle as required by the standards. By activating different working conditions of the vehicle, various possible situations occurring in the normal driving process of the vehicle are simulated. When a plug-in hybrid mini truck underwent the above two tests, the result of radiated emission test was found to exceed the limit value of the standard. The relevant problem electrical parts are identified by analyzing the radiated emission data of the vehicle, conducting near-field scanning of the vehicle, and locating the over-standard problem points. Through rectification and optimization, the plug-in hybrid mini truck fulfilled the relevant requirements of national standards GB/T 18387-2017 and GB 34660-2017 on the radiation of vehicles.
Evaluation of Energy Storage Station Based on the Optimal Weighting Method
Authors: Yang Zaixin , A Minfu , Yin Baiqing
Published: September 2023

The energy storage station is playing an increasingly important role in supporting new power systems. How to scientifically and effectively evaluate the application effect of energy storage stations is an urgent problem to be solved. In this study, a multi-indicator evaluation model for energy storage stations is established. An improved fuzzy comprehensive assessment (FCA) with optimal weight is applied to actual energy storage stations. Using the energy storage station monitoring platform, comprehensive evaluation scores of demonstrated energy storage stations are obtained. The support effect of energy storage stations on the power grid is evaluated from three aspects: performance, operational reliability, and energy efficiency. The higher the evaluation score, the stronger the energy storage regulation ability, and the more significant the active support to the power grid.
Power distribution network reliability calculation method based on collective multi-label classifier and energy entropy
Authors: Huang Yuchun , Zhang Daolu , Liu Minghao , Zhang Yanyu , Zhang Bin
Published: September 2023

Reliable power supply from the grid is vital to life and work, production activities, and national security. At present, the simulation calculation method of distribution network reliability needs a lot of time. In view of this shortcoming, this paper proposes a multi-label classifier model using the importance sampling method, which can shorten the calculation time by reasonably extracting samples. At the same time, the multi-label classifier can evaluate the failure probability of the electric power distribution network at the bus level. Finally, we use the IEEE RTS model to test the proposed method, and the effectiveness of the proposed method is verified.
Product design innovation based on the functional characteristics of the eight-masted windmill
Authors: Zhou Feng , Zhao Xuegong , Wang Chenbin , Zhang Liping
Published: September 2023

To catch and research the functional characteristics of the eight-masted vertical windmill and its automatic readjustment of sail angle in the Lixia River area of northern Jiangsu Province, to permit this intangible cultural heritage a new practical meaning in modern tourism through the innovative design of the sail structure of the eight-masted windmill, and to come up with a portable folding windmill product suitable for outdoor sports enthusiasts. Firstly, we spell out the history of the eight-masted windmill and its “trotting horse lamp” structure through literature research and draw the working principle of the eight-masted windmill in operation, and combine the eight-masted windmill with power generation device by converting wind energy into electricity. The design direction was to design a lightweight, breeze start, and stable power output windmill generator; secondly, the sketch of the windmill main shaft structure and scheme were selected, and the integrated form of the fan blade and the mast was selected as the sketch scheme; finally, the model experiment of the prototype of the folding scheme was conducted, and the absolute pressure difference between blades was analyzed by hydrodynamics to determine that the windmill can be used to generate electricity. After verifying its feasibility, the portable folding generator was modeled in 3D by MCAD, and make a physical model of the generator was made in a reduced scale of 1:2.5. Through the innovative design of the eight-masted windmill, it is made to serve the production life of modern society.