Framework
Ray H. Elling
This chapter sets out and motivates a framework for naturalizing content, ‘varitel semantics’. It is based on the explanatory advantages that flow from realism about the vehicles of content. Its distinctive features include: pluralism; eschewing representation consumers; being testing against a desideratum concerning representational explanation rather than against intuitions; and a proposal about the way exploitable relations, vehicle processing and a system’s functions come together to constitute content.
Axiomatic Basis for Computer Programming
L. Osho, F. Ogwueleka, Oluwafemi Osho
This paper considers a formal method, known as axiomatic semantics, used to prove the correctness of a computer program. This formal method extracts, using some proof rules, the mathematical verification conditions from a computer program. The axioms of program flow, including, sequential flow, iteration, and alternation flows are presented. Using the axiomatic basis the completeness of two variants of integer multiplication program is proved. Results show that computer programs can actually be verified sufficiently for correctness without necessarily testing them, or more practically put, to complement their testing.
1002 sitasi
en
Mathematics
InterFaceGAN: Interpreting the Disentangled Face Representation Learned by GANs
Yujun Shen, Ceyuan Yang, Xiaoou Tang
et al.
Although generative adversarial networks (GANs) have made significant progress in face synthesis, there lacks enough understanding of what GANs have learned in the latent representation to map a random code to a photo-realistic image. In this work, we propose a framework called InterFaceGAN to interpret the disentangled face representation learned by the state-of-the-art GAN models and study the properties of the facial semantics encoded in the latent space. We first find that GANs learn various semantics in some linear subspaces of the latent space. After identifying these subspaces, we can realistically manipulate the corresponding facial attributes without retraining the model. We then conduct a detailed study on the correlation between different semantics and manage to better disentangle them via subspace projection, resulting in more precise control of the attribute manipulation. Besides manipulating the gender, age, expression, and presence of eyeglasses, we can even alter the face pose and fix the artifacts accidentally made by GANs. Furthermore, we perform an in-depth face identity analysis and a layer-wise analysis to evaluate the editing results quantitatively. Finally, we apply our approach to real face editing by employing GAN inversion approaches and explicitly training feed-forward models based on the synthetic data established by InterFaceGAN. Extensive experimental results suggest that learning to synthesize faces spontaneously brings a disentangled and controllable face representation.
684 sitasi
en
Computer Science, Engineering
Bringing the web up to speed with WebAssembly
Andreas Haas, Andreas Rossberg, Derek L. Schuff
et al.
753 sitasi
en
Computer Science
In-Place Scene Labelling and Understanding with Implicit Scene Representation
Shuaifeng Zhi, Tristan Laidlow, Stefan Leutenegger
et al.
Semantic labelling is highly correlated with geometry and radiance reconstruction, as scene entities with similar shape and appearance are more likely to come from similar classes. Recent implicit neural reconstruction techniques are appealing as they do not require prior training data, but the same fully self-supervised approach is not possible for semantics because labels are human-defined properties.We extend neural radiance fields (NeRF) to jointly encode semantics with appearance and geometry, so that complete and accurate 2D semantic labels can be achieved using a small amount of in-place annotations specific to the scene. The intrinsic multi-view consistency and smoothness of NeRF benefit semantics by enabling sparse labels to efficiently propagate. We show the benefit of this approach when labels are either sparse or very noisy in room-scale scenes. We demonstrate its advantageous properties in various interesting applications such as an efficient scene labelling tool, novel semantic view synthesis, label denoising, super-resolution, label interpolation and multi-view semantic label fusion in visual semantic mapping systems.
536 sitasi
en
Computer Science
Python Reference Manual
G. Rossum
1749 sitasi
en
Computer Science
Structured Design Methodology for Compact Plate Heat Exchangers
Md Zishan Akhter, Mohammad Faisal, Ahmed Shaaban
et al.
The increasing demand for compact and high-performance thermal management systems in the industrial and energy sectors has renewed interest in plate-type heat exchangers for high heat-flux dissipation. These exchangers offer high surface-area-to-volume ratios, modular architecture, and scalable construction, making them suitable for applications requiring advanced cooling within restricted space. This study presents a structured thermo-hydraulic design framework for compact plate heat exchangers operating under fixed wall-temperature boundary conditions. The framework integrates geometric scaling, surface-morphology variation, and multi-parameter performance evaluation to assess the balance between convective enhancement and hydraulic losses. Water at 25 °C serves as the working fluid due to its favorable thermophysical properties and economic viability. A constant wall temperature of 100 °C is applied as a fixed boundary condition to provide a consistent thermal driving potential for comparing different geometries in a range of industrially relevant operating regimes. Three primary design variables are examined: (<i>i</i>) a baseline flat-plate configuration used to establish the fundamental flow–thermal response; (<i>ii</i>) systematic variation of inter-plate spacing to characterize the hydraulic–thermal tradeoff; and (<i>iii</i>) surface-morphology variation using chevron and sinusoidal corrugations to enhance convection through secondary flow generation and boundary-layer modulation. The key performance metrics include wall heat flux, overall heat-transfer coefficient, thermal resistance, and pressure-drop penalty. These indicators are evaluated to identify configurations that are thermally effective and hydraulically feasible. The results show that an inter-plate spacing of 7 mm provides a favorable balance between confinement and convective enhancement under the present operating conditions. Sinusoidal corrugations yield the most favorable thermo-hydraulic performance (PEC <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>≈</mo><mn>1.30</mn></mrow></semantics></math></inline-formula>) while maintaining low frictional losses. The proposed framework provides a transferable physics-based methodology for comparative assessment and early-stage design of compact heat exchangers under fixed pumping-power constraints. The approach is broadly applicable to renewable-energy systems and compact thermal management in industrial applications.
Remote Sensor System for Assessing the Toxicity of Car Exhaust Gases
Krzysztof Więcławski, Jędrzej Mączak, Krzysztof Szczurowski
This paper presents the design of a sensor system for remote measurements of exhaust emissions from automotive combustion engines. The system’s purpose is to determine the likelihood of a given vehicle’s potential harmfulness to the environment. This system, if implemented, could detect vehicles posing a threat to the environment in road traffic. A remote measurement system can be installed in the front of a measuring vehicle driving behind the vehicle being diagnosed. This approach allows for rapid road testing of multiple vehicles while they are operating in real-world conditions where engines can emit the highest levels of undesirable pollutants. Exceeding emission standards may be related to modifications made to the vehicle’s exhaust gas aftertreatment systems, engine wear, or malfunctions of engine-related systems such as the diesel particulate filter (DPF) or catalytic converter. Toxic and undesirable substances include carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO<i><sub>x</sub></i>), carbon dioxide (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="normal">C</mi><mi mathvariant="normal">O</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></semantics></math></inline-formula>), and particulate matter (PM) particles. The main goal of the measurements is to identify vehicles that potentially pose a threat to the environment during normal operation. The sensor system consists of several types of sensors utilizing various physical and chemical phenomena, with particular emphasis on their low cost and easy availability. The measurement unit utilizes MEMS technology, photoacoustic spectroscopy, electrochemical methods, light absorption and scattering, spectrophotometry, and electro-optical detection.
Bridging Compositional and Distributional Semantics: A Survey on Latent Semantic Geometry via AutoEncoder
Yingji Zhang, Danilo S. Carvalho, André Freitas
Integrating compositional and symbolic properties into current distributional semantic spaces can enhance the interpretability, controllability, compositionality, and generalisation capabilities of Transformer-based auto-regressive language models (LMs). In this survey, we offer a novel perspective on latent space geometry through the lens of compositional semantics, a direction we refer to as \textit{semantic representation learning}. This direction enables a bridge between symbolic and distributional semantics, helping to mitigate the gap between them. We review and compare three mainstream autoencoder architectures-Variational AutoEncoder (VAE), Vector Quantised VAE (VQVAE), and Sparse AutoEncoder (SAE)-and examine the distinctive latent geometries they induce in relation to semantic structure and interpretability.
Denotational semantics for stabiliser quantum programs
Robert I. Booth, Cole Comfort
The stabiliser fragment of quantum theory is a foundational building block for quantum error correction and the fault-tolerant compilation of quantum programs. In this article, we develop a sound, universal and complete denotational semantics for stabiliser operations which include measurement, classically-controlled Pauli operators, and affine classical operations, in which quantum error-correcting codes are first-class objects. The operations are interpreted as certain affine relations over finite fields. This offers a conceptually motivated and computationally-tractable alternative to the standard operator-algebraic semantics of quantum programs (whose time complexity grows exponentially as the state space increases in size). We demonstrate the power of the resulting semantics by describing a small, proof-of-concept assembly language for stabiliser programs with fully-abstract denotational semantics.
Feasibility Study of Flywheel Mitigation Controls Using Hamiltonian-Based Design for <i>E</i><sub>3</sub> High-Altitude Electromagnetic Pulse Events
Connor A. Lehman, Rush D. Robinett, David G. Wilson
et al.
This paper explores the feasibility of implementing a flywheel energy storage system designed to generate voltage for the purpose of mitigating current flow through the transformer neutral path to ground, which is induced by a high-altitude electromagnetic pulse (HEMP) event. The active flywheel system presents the advantage of employing custom optimal control laws, in contrast to the conventional approach of utilizing passive blocking capacitors. A Hamiltonian-based optimal control law for energy storage is derived and integrated into models of both the transformer and the flywheel energy storage system. This Hamiltonian-based feedback control law is subsequently compared against an energy-optimal feedforward control law to validate its optimality. The analysis reveals that the required energy storage capacity is <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>13</mn><mspace width="0.277778em"></mspace><mi>Wh</mi></mrow></semantics></math></inline-formula>, the necessary power output is less than <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>5</mn><mspace width="0.277778em"></mspace><mi>kW</mi></mrow></semantics></math></inline-formula> at any given time during the insult, and the required bandwidth for the controller is around <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>5</mn><mspace width="0.277778em"></mspace><mi>Hz</mi></mrow></semantics></math></inline-formula>. These specifications can be met by commercially available flywheel devices. This methodology can be extended to other energy storage devices to ensure that their specifications adequately address the requirements for HEMP mitigation.
Beyond Abducted Semantics: Ethnographic Methods and Literary Theory as Frameworks for Research Engines That Enhance Human Understanding
Alison Louise Kahn
This article examines how ethnographic methodology and literary theory can advance research engines and artificial intelligence systems beyond the reductive computational approaches that dominate contemporary AI development. Drawing on recent Stanford research revealing fundamental gaps in large language models’ ability to distinguish factual knowledge from belief, I argue that contemporary AI systems enact what I term “abducted semantics”—appropriating the inferential logic of human meaning-making while systematically attenuating the culturally embedded, phenomenologically grounded capacities that generate authentic understanding. Through close analysis of Clifford Geertz’s thick description, Charles Sanders Peirce’s triadic semiotics, and canonical literary works—Miguel de Cervantes’ <i>Don Quixote</i> and Gabriel García Márquez’s <i>One Hundred Years of Solitude</i>—I demonstrate that human understanding operates through complex semiotic processes irreducible to pattern-matching and statistical prediction. The article proposes concrete interventions to transform research engines from tools of semantic extraction into technologies that preserve and enhance interpretive richness, arguing that ethnographic and literary methodologies offer essential correctives to the epistemological impoverishment inherent in current AI architectures.
Anthropology, Archaeology
A Fifth-Generation-Based Synchronized Measurement Method for Urban Distribution Networks
Jie Zhang, Bo Pang, Linghao Zhang
et al.
This work proposes a 5G-based synchronized measurement method for urban distribution networks. First, downlink frequency synchronization is achieved by cross-correlating the Primary and Secondary Synchronization Signals (PSSs/SSSs) within gNB-broadcast Synchronization Signal Blocks (SSBs), enabling accurate alignment with the 5G system clock. Then, uplink phase synchronization is refined using Timing Advance (TA) feedback to compensate for propagation delays. Based on the recovered 5G Pulse Per Second (PPS) signal, a dynamic compensation algorithm is applied to discipline the SAR ADC sampling process. This algorithm tracks crystal oscillator drift, accumulates sub-cycle deviations, and corrects integer timer counts only when the error exceeds <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>±</mo><mn>0.5</mn></mrow></semantics></math></inline-formula>. Simulations under a 228 MHz oscillator and 1200 samples per cycle demonstrate that the accumulated phase error remains below 0.00008°, satisfying IEEE C37.118 precision requirements. Compared with traditional GPS-based synchronization methods, the proposed solution offers greater deployment flexibility and can operate reliably in GPS-denied environments such as indoors and urban canyons.
A Stackelberg Game Approach to Model Reference Adaptive Control for Spacecraft Pursuit–Evasion
Gena Gan, Ming Chu, Huayu Zhang
et al.
A Stackelberg equilibrium–based Model Reference Adaptive Control (MSE) method is proposed for spacecraft Pursuit–Evasion (PE) games with incomplete information and sequential decision making under a non–zero–sum framework. First, the spacecraft PE dynamics under <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>J</mi><mn>2</mn></msub></semantics></math></inline-formula> perturbation are mapped to a dynamic Stackelberg game model. Next, the Riccati equation solves the equilibrium problem, deriving the evader’s optimal control strategy. Finally, a model reference adaptive algorithm enables the pursuer to dynamically adjust its control gains. Simulations show that the MSE strategy outperforms Nash Equilibrium (NE) and Single–step Prediction Stackelberg Equilibrium (SSE) methods, achieving 25.46% faster convergence than SSE and 39.11% lower computational cost than NE.
Motor vehicles. Aeronautics. Astronautics
A Study on the Evolution of Emission Altitude with Frequency Among 104 Normal Pulsars
Chaoxin Luo, Xin Xu, Changrong Du
et al.
Utilizing the databases from the European Pulsar Network (EPN), the Australia Telescope National Facility (ATNF), and published literature data, a geometric method was used to investigate the multifrequency emission altitude of 104 pulsars. We found that the evolution of emission altitudes with frequency for the majority of pulsars can be fitted using a power-law function with a normalization constant. In this work, it is found that the frequency evolution of pulsar emission altitude can be divided into three groups according to their different frequency dependencies of emission altitude (emission altitude decreases with frequency (Group A, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>η</mi><mo>≤</mo><mo>−</mo><mn>0.1</mn></mrow></semantics></math></inline-formula>), keeps relatively constant with frequency (Group B, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>0.1</mn><mo><</mo><mi>η</mi><mo>≤</mo><mn>0.1</mn></mrow></semantics></math></inline-formula>), and increases with frequency (Group C, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>η</mi><mo>≥</mo><mn>0.1</mn></mrow></semantics></math></inline-formula>)), where <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>η</mi></semantics></math></inline-formula> is the emission altitude variation rate. We also computed the emission altitudes across multiple frequency bands for these pulsars, thereby estimating the approximate range of the pulsar emission regions. We found that most pulsar emissions occur at altitudes of tens to hundreds of kilometers above the polar cap, with differences in emission altitude between the three groups becoming more clear at lower frequencies.
Elementary particle physics
Certainty Stance Adverbs in Chinese Linguistic Academic Writing: A Corpus-based Study
Natalia M. Dugalich, Hao Han
This study delves into the intricate usage of certainty stance adverbs in the academic writings of the Chinese. The object of this study is to conduct a contrastive analysis of certainty stance adverbs between Chinese linguistic MA novices and linguistic experts. The subject of this study is to explore the similarities and differences in the use of these adverbs within the academic discourse of the two groups mentioned. In addressing these disparities, the study seeks to analyze them from the perspective of interlanguage and interpersonal function, with the ultimate goal of enhancing the production of high-quality academic papers by the Chinese. The study employs two key methods: the contrastive analysis method and the corpus-based method. The novelty of the study lies in its contrastive examination of certainty stance adverbs between Chinese linguistic MA novices and experts. Through an in-depth analysis of theoretical frameworks and linguistic data extracted from the MA theses of Chinese linguistic novices and research articles of linguistic experts, the study underscores the importance of considering the similarities and differences in the use of certainty stance adverbs within the realm of second language acquisition and pragmatic studies. This consideration aims to refine learners’ syntactical and pragmatic command of certainty stance adverbs to align with expert academic discourse, ultimately fostering effective interpersonal communication in academic writing. The findings of this research offer valuable insights into the specific linguistic challenges encountered by the Chinese, thereby laying a solid groundwork for the development of targeted pedagogical strategies to bolster their academic writing skills.
Language. Linguistic theory. Comparative grammar, Semantics
Advertisement for a Semantics for Psychology
N. Block
Tab2KG: Semantic Table Interpretation with Lightweight Semantic Profiles
Simon Gottschalk, Elena Demidova
Tabular data plays an essential role in many data analytics and machine learning tasks. Typically, tabular data does not possess any machine-readable semantics. In this context, semantic table interpretation is crucial for making data analytics workflows more robust and explainable. This article proposes Tab2KG - a novel method that targets at the interpretation of tables with previously unseen data and automatically infers their semantics to transform them into semantic data graphs. We introduce original lightweight semantic profiles that enrich a domain ontology's concepts and relations and represent domain and table characteristics. We propose a one-shot learning approach that relies on these profiles to map a tabular dataset containing previously unseen instances to a domain ontology. In contrast to the existing semantic table interpretation approaches, Tab2KG relies on the semantic profiles only and does not require any instance lookup. This property makes Tab2KG particularly suitable in the data analytics context, in which data tables typically contain new instances. Our experimental evaluation on several real-world datasets from different application domains demonstrates that Tab2KG outperforms state-of-the-art semantic table interpretation baselines.
Near-Infrared Transitions from the Singlet Excited States to the Ground Triplet State of the S<sub>2</sub> Molecule
Lidan Xiao, Bing Yan, Boris F. Minaev
Intensity of transitions from the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi>b</mi><mn>1</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mi mathvariant="normal">g</mi><mo>+</mo></msubsup><mo> </mo></mrow></semantics></math></inline-formula> and <i>a</i><sup>1</sup>Δ<sub>g</sub> states to the ground state <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi mathvariant="normal">X</mi><mn>3</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mi mathvariant="normal">g</mi><mo>−</mo></msubsup><mo> </mo></mrow></semantics></math></inline-formula> in the near IR emission spectrum of the S<sub>2</sub> molecule has been calculated by the multireference configuration interaction method taking into account spin-orbit coupling (SOC). The intensity of the<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo> </mo><msup><mi>b</mi><mn>1</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mi mathvariant="normal">g</mi><mo>+</mo></msubsup></mrow></semantics></math></inline-formula> − <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mrow><mo> </mo><mi mathvariant="normal">X</mi></mrow></mrow><mn>3</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mrow><mi mathvariant="normal">g</mi><mo>,</mo><mi>M</mi><mi>s</mi><mo>=</mo><mo>±</mo><mn>1</mn></mrow><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> transition is largely determined by the spin interaction with the electromagnetic wave, which comes from the zero-field splitting of the ground X multiplet and the SOC-induced mixing between <i>b</i> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi mathvariant="normal">X</mi><mn>3</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mrow><mi mathvariant="normal">g</mi><mo>,</mo><mn>0</mn></mrow><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> states. The Einstein coefficients for the experimentally detected 0−0, 0−1, 1−1 bands of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi>b</mi><mn>1</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mi mathvariant="normal">g</mi><mo>+</mo></msubsup><mo>−</mo><msup><mi mathvariant="normal">X</mi><mn>3</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mrow><mi mathvariant="normal">g</mi><mo>,</mo><mi>M</mi><mi>s</mi><mo>=</mo><mo>±</mo><mn>1</mn></mrow><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> emission system are calculated in good agreement with observations. The Einstein coefficient of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi>a</mi><mn>1</mn></msup><msub><mo>∆</mo><mi mathvariant="normal">g</mi></msub><mo>−</mo><msup><mi mathvariant="normal">X</mi><mn>3</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mrow><mi mathvariant="normal">g</mi><mo>,</mo><mi>M</mi><mi>s</mi><mo>=</mo><mo>±</mo><mn>1</mn></mrow><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> magnetic dipole transition is very low, being equal to 0.0014 s<sup>−1</sup>. Nonetheless, the weakest of all experimentally observed bands (the 0−0 band of the <i>a-X<sub>Ms=</sub></i><sub>±1</sub> transition) qualitatively corresponds to this calculation. Most importantly, we provide many other IR bands for magnetic dipole <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi>b</mi><mn>1</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mi mathvariant="normal">g</mi><mo>+</mo></msubsup></mrow></semantics></math></inline-formula> − <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mrow><mo> </mo><mi mathvariant="normal">X</mi></mrow></mrow><mn>3</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mrow><mi mathvariant="normal">g</mi><mo>,</mo><mi>M</mi><mi>s</mi><mo>=</mo><mo>±</mo><mn>1</mn></mrow><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi>a</mi><mn>1</mn></msup><msub><mo>∆</mo><mi mathvariant="normal">g</mi></msub><mo>−</mo><msup><mi mathvariant="normal">X</mi><mn>3</mn></msup><msubsup><mrow><mstyle mathsize="70%" displaystyle="true"><mo>∑</mo></mstyle></mrow><mrow><mi mathvariant="normal">g</mi><mo>,</mo><mi>M</mi><mi>s</mi><mo>=</mo><mo>±</mo><mn>1</mn></mrow><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> transitions, which could be experimentally observable in the S<sub>2</sub> transparency windows from a theoretical point of view. We hope that these results will contribute to the further experimental exploration of the magnetic infrared bands in the S<sub>2</sub> dimer.
Physical and theoretical chemistry
Wind Turbine Active Fault Tolerant Control Based on Backstepping Active Disturbance Rejection Control and a Neurofuzzy Detector
Hamza Assia, Houari Merabet Boulouiha, William David Chicaiza
et al.
Wind energy conversion systems have become an important part of renewable energy history due to their accessibility and cost-effectiveness. Offshore wind farms are seen as the future of wind energy, but they can be very expensive to maintain if faults occur. To achieve a reliable and consistent performance, modern wind turbines require advanced fault detection and diagnosis methods. The current research introduces a proposed active fault-tolerant control (AFTC) system that uses backstepping active disturbance rejection theory (BADRC) and an adaptive neurofuzzy system (ANFIS) detector in combination with principal component analysis (PCA) to compensate for system disturbances and maintain performance even when a generator actuator fault occurs. The simulation outcomes demonstrate that the suggested method successfully addresses the actuator generator torque failure problem by isolating the faulty actuator, providing a reliable and robust solution to prevent further damage. The neurofuzzy detector demonstrates outstanding performance in detecting false data in torque, achieving a precision of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>90.20</mn><mo>%</mo></mrow></semantics></math></inline-formula> for real data and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>100</mn><mo>%</mo></mrow></semantics></math></inline-formula> for false data. With a recall of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>100</mn><mo>%</mo></mrow></semantics></math></inline-formula>, no false negatives were observed. The overall accuracy of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>95.10</mn><mo>%</mo></mrow></semantics></math></inline-formula> highlights the detector’s ability to reliably classify data as true or false. These findings underscore the robustness of the detector in detecting false data, ensuring the accuracy and reliability of the application presented. Overall, the study concludes that BADRC and ANFIS detection and isolation can improve the reliability of offshore wind farms and address the issue of actuator generator torque failure.