bluuebunny/crossref_metadata_2025_split huggingface dataset:
Marine variable air volume air conditioning system modeling and simulation
Authors: Liu Qian , Lu Jie , Huang Jing , Yi Xiaojun , Chen Minghao , Fang Zhen , Fan Zhuo 
Published: December 2024

Abstract
Air conditioning system is one of the significant energy consumption systems in Marine ship operations, and its economic operation is a vital measurement index. Variable Air Volume (VAV) air-conditioning system have gradually become mainstream air conditioning system on account of its remarkable energy saving. This study presents the fundamental concept and features, and active disturbance rejection control (ADRC) serves as the foundation for the proposed approach. A simulation study in MATLAB/Simulink has made a comparison with the PID controller, and the conclusion provides a reference value for the design and application of the VAV conditioning system.
Reinforcement learning control of lateral vibration of high-speed train carbody
Authors: Mou Ruqiang , Chen Chunjun 
Published: December 2024

Abstract
Increasing speed is one of the effective ways to raise high-speed train (HST) transportation capacity. However, increasing speed leads to greater vibration of HST with passive suspension, which can reduce the smoothness and safety of HST. Thus, a twin delayed deep deterministic policy gradient (TD3) control strategy was designed to reduce the lateral vibration of the HST carbody. The 3-degree-of-freedom (DOF) and 17-DOF models were utilized in designing the TD3 controller and simulation, respectively. In addition, the ballastless track spectrum of the Chinese high-speed railway was utilized to obtain the irregularities of the track. A reward function containing cost and penalty was designed to raise TD3 controller training efficiency. A linear quadratic optimal cost function and a step penalty function were designed, respectively. The control effect of the TD3 strategy was studied by simulation. The results indicate that TD3 can effectively reduce root-mean-square (RMS) and peak values for lateral acceleration at the front and rear ends of the HST carbody, and significantly improve the lateral smoothness of the HST carbody, which verifies validity of TD3 strategy.
Research on control strategy and system for preventing elevator car from colliding with the roof
Authors: Jia Haijun , Kang Dugang , Lv Xiao , Yin Cun , Zheng Jian 
Published: December 2024

Abstract
Car top-collision accidents caused by mechanical or electrical failures in traction-driven elevators occur occasionally, often resulting in serious casualties. To avoid such safety accidents, this paper designs a car anti-top-collision system based on hydraulic guide rail braking devices, proposes a system design scheme, and carries out mechanical calculations, hydraulic system design, control circuit, and control program design. Finally, the system control program is verified using Cade_SIMU software. This system plays an important role in preventing car top-running accidents.
Dynamic event-triggered adaptive positioning control of unmanned surface vehicles with system uncertainties
Authors: Liu Caiyun , Li Xingxin , Chen Xinghua , Liu Qian , Zheng Zhenming 
Published: December 2024

Abstract
To solve the problems of unmanned surface vehicles (USVs), such as limited network bandwidth and computing resources, a finite-time command filtering backstepping (FTCFB) robust adaptive dynamic positioning control method with dynamic event-triggered mechanisms (DETM) for unmanned surface vehicles (USVs) is proposed. It addresses thruster dynamics, system uncertainties, and unknown external disturbances, ensuring finite-time convergence while mitigating issues like communication congestion and actuator wear. Adaptive neural networks are utilized to estimate the system uncertainties, and a DETM-based FTCFB control law, validated with Lyapunov stability theory, guarantees finite-time convergence of tracking and parameter estimation errors. Numerical simulations confirm the method’s effectiveness.
Design and application of an automated video inspection system for the inner wall of pressure vessels in nuclear power plant reactors
Authors: Chen Yang , Wang Haijun , Xu Junlong , Du Yu 
Published: December 2024

Abstract
The pressure vessel of a nuclear power plant reactor is one of the key equipment in pressurized water reactor nuclear power plants, and its inner wall is an essential component of the pressure boundary in the primary loop. The inner wall of the reactor pressure vessel is subjected to long-term alternating stress and fluid erosion caused by the flow of the working fluid, which can easily form various surface defects such as pitting and unevenness. In order to timely detect and handle such defects while taking into account the maintenance period and personnel radiation risks, this paper designs an automated video inspection system for the inner wall of the pressure vessel of a nuclear power plant reactor with telescopic and pitching functions, which realizes the automatic video scanning of the inner wall of the pressure vessel and the precise positioning of defects.
Optimizing the configuration of grid-forming and grid-following control in doubly-fed wind farms considering machine-side dynamics
Authors: Chen Shuang , Chen Yan , Hong Jie , Tang Ge , Chen Yanming 
Published: December 2024

Abstract
With the growing integration of renewable energy, particularly wind power, into power systems, the effectiveness of wind farms in supporting grid stability is increasingly critical. Traditional grid-following (GFL) controls often fall short in weak grids with low short-circuit ratios (SCR), leading to stability issues. In contrast, grid-forming (GFM) controls, which simulate synchronous machine behavior, offer enhanced grid support and stability. This study investigates the optimization of control strategies for doubly-fed induction generator (DFIG) wind farms by comparing four configurations—grid-following DFIGs, grid-side GFM DFIGs, machine-side GFM DFIGs, and doubly grid-forming DFIGs. Through MATLAB/Simulink simulations, the study finds that doubly grid-forming DFIGs provide superior stability and grid support under low SCR conditions. These findings inform optimal configuration practices for wind farms in high-renewable-energy environments.
Noether-Wald and Komar charges in supergravity, fermions, and Killing supervectors in superspace
Authors: Bandos Igor , Meessen Patrick , Ortín Tomás 
Published: December 2024

Abstract
The supersymmetry properties of Killing vectors and spinors in supergravity theory can be clarified by relating them to Killing supervectors in the supergravity superspace. In the superspace approach it is manifest that supersymmetry ‘mixes’ a Killing vector with its fermionic spinor ‘superpartner’ and the Killing equations with the generalization of the Killing spinor equations. The latter reduces to the standard Killing spinor equation, albeit with a fermionic spinor, when the fermionic fields are set to zero. Using these supersymmetry transformations in the spacetime component approach, we construct a Noether-Wald charge of N = 1, D = 4 supergravity with fermionic contributions which is diff-, Lorentz- and supersymmetry-invariant (up to a total derivative). The Killing supervector formalism for the maximal D = 11 supergravity and some related issues are also discussed.
Kontsevich graphs act on Nambu–Poisson brackets, I. New identities for Jacobian determinants
Authors: Kiselev Arthemy V , Jagoe Brown Mollie S , Schipper Floor 
Published: December 2024

Abstract
Nambu-determinant brackets on ℝ
d
∋ x = (x
1, …, x

d
), {f, g}
d
(x) = ϱ(x) · det (∂(f, g, a
1, …, a

d−2) / ∂(x
1, …, x

d
)), with a

i
∈ C
∞ (ℝ
d
) and

ϱ
·

∂

x

∈

X

d

(

R

d

)

, are a class of degenerate (rank ⩽ 2) Poisson structures with (non)linear coefficients, e.g., polynomials of arbitrarily high degree. With ‘good’ cocycles in the graph complex, Kontsevich associated universal – for all Poisson bi-vectors P on affine

ℝ

aff

d

– elements

P

˙

=

Q

γ

(

[
P
]

)

∈

H

P

2

(

ℝ

aff

d

)

in the Lichnerowicz–Poisson second cohomology groups; we note that known graph cocycles γ preserve the Nambu–Poisson class {P (ϱ, [a]), and we express, directly from γ, the evolution

ϱ

˙

,

a

˙

that induces

P

˙

.
Over all d ⩾ 2 at once, there is no ‘universal’ mechanism for the bi-vector cocycles

Q

d

γ

to be trivial,

Q

d

γ

=
〚
P
,

X

→

d

γ

(

[
P
]

)

〛

, w.r.t. vector fields defined uniformly for all dimensions d by the same graph formula. While over ℝ2, the graph flows

P

˙

=

Q

2
D

γi

(
P

(
ϱ
)

)

for γ ∈ {γ3, γ5, γ7. …} are trivialised by vector fields

X

→

2
D

γ

i

=
(
d
x
∧
d
y

)

−
1

d

d
R

(

Ham

γ

i

⁡
(
P
)
)

of peculiar shape, we detect that in d ⩾ 3, the 1-vectors from 2D, now with P (ϱ,a
1,… ,a

d−2) inside, do not solve the problems

Q

d
⩾
3

γ
i

=
〚
P
,

X

→

d
⩾
3

γ
i

(
P

(
ϱ
,

[
a
]

)

)

〛

, yet they do yield a good Ansatz where we find solutions

X

→

d
=
3
,
4

γ
i

(
P

(
ϱ
,

[
a
]

)

)

. In the study of the step d → d + 1, by adapting the Kontsevich graph calculus to the Nambu–Poisson class of brackets, we discover more identities for the Jacobian determinants within P (ϱ, [a]), i.e. for multivector-valued GL(d)-invariants on

ℝ

aff

d

.
Pseudo-Conformal Field Theory
Authors: Ragiadakos C. N. 
Published: December 2024

Abstract
Starting from the observation that the 2-d Polyakov action is metric independent without being topological, while the 4-d Weyl-conformal action is not metric independent, I searched for a 4-d structure and field equation which would be metric independent. I found that the structure is the existence of a geodetic and shear-free Newman-Penrose (NP) null tetrad, which is a Frobenius integrable structure, called lorentzian Cauchy-Riemann (LCR) structure. The metric independent equation is a gauge field equation identified with the gluon field. Imposing the LCR-structure as the fundamental structure of nature (instead of the Einstein-metric) all the interactions (gravity, electroweak and gluonic) are derived. The three generations of the leptons are solitonic configurations with precise topological invariants. The quarks are confined sources of the gluonic field implied by the LCR-tetrad of the corresponding leptons. Quantum field theory emerges through the Bogoliubov causal approach and the standard model is derived through the Scharf procedure of the Kugo-Ojima BRS elimination technique of the unphysical modes of the spin-1 and spin-2 fields.
Real double flag variety for the symmetric pair (U(p, p), GLp(ℂ)) and Galois cohomology
Authors: Nishiyama Kyo , Tauchi Taito 
Published: December 2024

Abstract
Let G be the indefinite unitary group U(p, p), H ≃ GL

p
(ℂ) its symmetric subgroup, P

S
the Siegel parabolic subgroup of G, and B

H
a Borel subgroup of H. In this article, we give a classification of the orbit decomposition H
\(H/B

H

×
G/P

S
) of the real double flag variety by using the Galois cohomology in the case where p = 2.
Covariant Schwarz maps in M2(ℂ)
Authors: Chruściński Dariusz 
Published: December 2024

Abstract
We analyze a class of qubit maps displaying diagonal unitary and orthogonal symmetries. For unital maps we characterize all covariant maps satisfying an operator Schwarz inequality. In particular well known Pauli maps are completely characterized. Going beyond the unital case we consider recently proposed generalizations of Schwarz inequality and provide the corresponding necessary and sufficient conditions for the entire class of covariant maps.
Near-horizon aspects of black holes in quantum spacetime
Authors: Herceg Nikola , Jurić Tajron , Naveena Kumara A. , Samsarov Andjelo , Smolić Ivica 
Published: December 2024

Abstract
We give a short introduction to the formalism of noncommutative (twisted) differential geometry that is used to derive the equations of motion for the gravitational perturbation of the Schwarzschild black hole in quantized spacetime. Special attention is given to quantum spacetime arising from r
−
φ noncommutativity. Tortoise coordinate and near-horizon regions of the effective potentials are analyzed for both polar and axial modes. By carefully examining the associated Schrödinger-type equations, we provide the asymptotic solutions at the horizon and illustrate some differences between the polar and axial modes. These findings give further insight into the polar-axial isospectrality violation in the presence of the quantum structure of spacetime.
Super-stable points and cycles on double-tetrahedral chains
Authors: Amatuni G. , Burdik Č. , Poghosyan H. , Ananikyan L. , Ananikian N. 
Published: December 2024

Abstract
Quantum systems with antiferromagnetic spin-1 Ising and Ising-Heisenberg interactions with single-ion anisotropy on double-tetrahedral chains can exhibit unconventional classical and quantum states responsible for the anomalous behavior of magnetization curves at low temperatures. We find super-stable points and cycles for those chains when the temperature tends to zero.
Noncommutative spaces of geodesics with light-like κ-Poincaré covariance
Authors: Gutierrez-Sagredo Ivan , Ballesteros Angel , Herranz Francisco J. 
Published: December 2024

Abstract
The aim of this contribution is to highlight the relevance of the so-called light-like (or null-plane) κ-Poincaré quantum deformation in relation with the construction of noncommutative spaces in the context of quantum gravity phenomenology. The role of this deformation is enhanced when, in addition to the construction of quantum group covariant noncommutative spacetimes, noncommutative spaces of geodesics preserving the same quantum group symmetry are also considered.
Study of the calculation IR and modeling on nitrile rubber
Authors: Han Yu-Tian , Liu Chang-Kui 
Published: December 2024

Abstract
Nitrile rubber (NBR) is a common analysis object in the field of non-metallic failure analysis. Usually, the sample state greatly affects the quality of the spectrum when collecting its infrared spectrum (IR), leading to increased difficulty in interpretation. This paper took NBR as an example and carried on a discussion and comparative analysis for the calculated IR of NBR and its Modelling. As a result, a polymer modeling method for computational IR was proposed.
Cooperative game theory based coordinated scheduling of production and transportation of parallel machines with deterioration effects
Authors: Gong Hua , Zhang Yunna , Sun Wenjuan 
Published: December 2024

Abstract
Cooperative game theory is used to study the production and transportation scheduling problem of parallel machines with deterioration effects. Jobs with an initial scheduling order are processed on parallel machines and then transported to customers. Penalties are incurred for early or late completion if the jobs are not completed on the due dates. Considering that jobs can rearrange the scheduling order in the coalition through cooperation to bring about cost savings, the cooperative game model is constructed by considering the jobs as players and taking the maximum cost savings of the coalition as the characteristic function. It is proven that when jobs have the same normal processing time and deterioration rate, the cooperative game has a non-empty core, and a core allocation can be obtained from the β-rule allocation method. A Dual Replay Buffer Double DQN (DRB-DDQN) algorithm is designed to get the optimal schedule of the coalition. Experiments demonstrate the effectiveness of the DRB-DDQN and β-rule allocation method in solving the game scheduling problem.
Numerical simulation method for shock vibration based on finite element substructure
Authors: Liang Zhengang , Li Haoyu , Qi Hongli , Liu Ji’an , Guo Tengfei , Li Jianan , Zhao Han 
Published: December 2024

Abstract
For engineering problems such as shock vibration, finite element simulation is a very effective method, but for too large models, meshing them in finite element software generates a large number of grid cells, which is time-consuming to compute and limits the application of solid cells in the simulation of large models, so the use of the substructure method will effectively solve the problem. In this paper, we will first explore the influence of the mesh size on the simulation results to get the most suitable mesh. This paper will first investigate the effect of grid size on the simulation results to get the most appropriate grid size, and then use the substructure method to encrypt the grid of the part that needs to be studied and analyze it individually, and at the same time, carry out the validation experiments to compare the results with the substructure simulation results, to investigate the reasonableness of the substructure method in the propagation process of shock vibration.
Investigation of electron backscattering on silicon drift detectors for the sterile neutrino search with TRISTAN
Authors: Spreng D. , Urban K. , Carminati M. , Edzards F. , Fiorini C. , Lechner P. , Nava A. , Siegmann D. , Wiesinger C. , Mertens S. 
Published: December 2024

Abstract
Sterile neutrinos are hypothetical particles in the minimal
extension of the Standard Model of Particle Physics. They could be
viable dark matter candidates if they have a mass in the keV
range. The Karlsruhe tritium neutrino (KATRIN) experiment, extended
with a silicon drift detector focal plane array (TRISTAN), has the
potential to search for keV-scale sterile neutrinos by measuring the
kinematics of the tritium β-decay. The collaboration targets
a sensitivity of 10-6 on the mixing amplitude
sin2Θ. For this challenging target, a precise
understanding of the detector response is necessary. In this work,
we report on the characterization of electron backscattering from
the detector surface, which is one of the main effects that
influence the shape of the observed energy spectrum. Measurements
were performed with a tandem silicon drift detector system and a
custom-designed electron source. The measured detector response and
backscattering probability are in good agreement with dedicated
backscattering simulations using the Geant4 simulation
toolkit.
Development of 16MeV compact cyclotron RF system with solid-state amplifier and fully digital controller
Authors: Wang Z.Y. , Lei Y. , Fu H.R. , Cai X.W. , Liu W. , Li M. , Li H.P. , Lv Y.L. , Wang S. 
Published: December 2024

Abstract
State Power Investment Corporation (SPIC) developed a
16 MeV compact cyclotron for producing medical radioactive isotope
18F. The cyclotron radio frequency (RF) system's architecture
and hardware design as well as the control algorithms and software
design are discussed and tested in this paper. The RF system
includes a RF cavity, a 16 kW 38.44 MHz RF solid-state amplifier
(SSA), power transmission line systems and a fully digitalized
low-level RF (LLRF) unit. The RF cavity consists of two dees, a
coarse tuning plate, a fine-tuning plate, a RF feeding port, a RF
pickup port with a compact size and relatively low power
dissipation. The RF amplifier adopts an all-solid-state compact
design without any circulator as this cyclotron operates at a
relatively lower frequency, and cooperates with the digital LLRF
system to realize RF power feed-in at low frequency. By using LLRF
featuring functions of tuning control, amplitude control, and phase
control, the RF system achieved cavity frequency tuning, closed loop
amplitude and phase regulations of the cavity. Through a fully
digitalized low-level design, the system realized parameterized
configuration capabilities. By adopting non-IQ RF direct sampling,
the efficient noise suppression control was achieved. To reduce the
maintenance and operational complexity of the system, the system
adopted a novel hybrid frequency tuning algorithm that could enable
rapid tuning control of cyclotron cavity. Based on a brand-new
parameterized automated RF running process, the system realized
automatic RF power-up procedure. In beam commissioning, the measured
amplitude stability of the RF system was better than 0.1% and phase
stability was better than 0.3∘. The design and performance
test results of the RF system will be presented in this paper.
Reply to Comment on ‘Extreme weather events in early summer 2018 connected by a recurrent hemispheric wave-7 pattern’
Authors: Kornhuber Kai , Coumou Dim , Petri Stefan , Osprey Scott , Rahmstorf Stefan 
Published: December 2024

Abstract
Circumglobal teleconnections from wave-like patterns in the mid-latitude jets can lead to synchronized weather extremes in the mid-latitudes of Northern and Southern hemispheres. The simultaneous occurrence of record breaking and persistent northern hemisphere temperature anomalies in Summer 2018 were previously discussed in the context of a persistent zonally elongated wave-7 pattern that stretched over large parts of the northern hemisphere over an extended time and let to considerable societal impacts. Various diagnostics have been put forward to quantify and detect such wave patterns, many of which incorporate low-pass time filtering to separate signal from noise. In this response we argue that advancing our understanding of the large-scale circulation’s response to anthropogenic climate change and reducing associated uncertainties in future climate risk requires a diverse range of perspectives and diagnostics from both the climate and weather research communities.
Economic impacts of floods in China and adaptation strategies under climate change
Authors: Xue Ying , Xia Jun , Liu Yuan , Zou Lei 
Published: December 2024

Abstract
Climate change has intensified the frequency and severity of heavy rainfall and flooding in China, posing serious threats to economic and social stability. Over the past 40 years, the increasing trend of these events has led to significant economic losses, highlighting the urgent need to develop effective adaptation strategies in both research and policy. This study used the Adaptive Regional Input–Output model to comprehensively assess the economic impacts of the July 2021 Henan flood, with a main focus on indirect economic losses (IELs) that are often underestimated in traditional assessments. The findings revealed that the IELs were up to $37.9 billion, nearly twice the direct economic losses. Additionally, a sensitivity analysis showed that increasing production capacity and the timing required to achieve it were two key factors to reduce IELs. Based on these insights, this study proposes an adaptation strategy framework tailored to China’s current development context, where systemic governance, strategic investments, and technological innovation are accounted for. This framework offers practical strategies to reduce the impacts caused by floods, thereby providing valuable guidance for sustainable disaster risk reduction and long-term economic stability in China.