Double Construction Research Articles

Double copy of 3D Chern-Simons theory and 6D Kodaira-Spencer gravity

We apply an algebraic double copy construction of gravity from gauge theory to three-dimensional (3D) Chern-Simons theory. The kinematic algebra K is the 3D de Rham complex of forms equipped, for a choice of metric, with a graded Lie algebra that is equivalent to the Schouten-Nijenhuis bracket on polyvector fields. The double copied gravity is defined on a subspace of K⊗K¯ and yields a topological double field theory for a generalized metric perturbation and two 2-forms. This local and gauge invariant theory is non-Lagrangian but can be rendered Lagrangian by abandoning locality. Upon fixing a gauge this reduces to the double copy of Chern-Simons theory previously proposed by Ben-Shahar and Johansson. Furthermore, using complex coordinates in C3 this theory is related to six-dimensional (6D) Kodaira-Spencer gravity in that truncating the two 2-forms and one equation yields the Kodaira-Spencer equations on a 3D real slice of C3. The full 6D Kodaira-Spencer theory can instead be obtained as a consistent truncation of a chiral double copy. Published by the American Physical Society 2024

Optimization of crashworthiness design of foam-filled crash boxes under oblique loading for electric vehicles

To increase the energy-absorbing capability of frontal collision management systems and improve vehicle crash safety, foam-filled crash boxes should be optimized. On the basis of a double tubular construction, a novel foam-filled crash box with a different design is developed. The energy absorption capacity, initial peak force, and deformation modes of the original and improved crash boxes were examined using impact models. As opposed to the full-filling design, it is demonstrated that the filling design may utilize less foam while increasing specific energy absorption. The stability of continuing deformation after the first buckling is determined by the foam-filled crash box. For the foam-filled crash box, a better-optimized design technique is suggested using the Taguchi method and principal component analysis (PCA). Compression tests are used to validate the design concept. Therefore, the optimal design technique of the crash box is suitable and practical for the crashworthiness design of crash boxes, considering the combined effect of significant indicators for electric vehicles.

Quasi-Frobenius Novikov algebras and pre-Novikov bialgebras

Pre-Novikov algebras and quasi-Frobenius Novikov algebras naturally appear in the theory of Novikov bialgebras. In this paper, we show that there is a natural pre-Novikov algebra structure associated to a quasi-Frobenius Novikov algebra. Then we introduce the definition of double constructions of quasi-Frobenius Novikov algebras associated to two pre-Novikov algebras and show that it is characterized by a pre-Novikov bialgebra. We also introduce the notion of pre-Novikov Yang-Baxter equation, whose symmetric solutions can produce pre-Novikov bialgebras. Moreover, the operator forms of pre-Novikov Yang-Baxter equation are also investigated.

한국어 이항 서술어 ‘좋다’의 논항 실현 양상 연구

This study focuses on double subject constructions with the predicate ‘cohta((be) good/like)’, sourced from messenger corpus, finally categorizing them into six types in terms of their syntactic and semantic properties. A significant finding is that 97% of the analyzed sentences fall into type 1 and type 2, with a maximum of three noun phrases being realized. Type 1 and type 2 are notably distinct in several aspects including the semantic traits of noun phrases, the placement of adverbs of degree, the variability in the use of particles, and verb phrase expansion. Although the research is confined to specific conditions, limiting its general applicability to Korean double subject constructions, it can contribute to general Korean syntax by exploring a wide range of cases, including those typically unrealized, and highlighting the frequent syntactic and semantic variations beyond just the particles 'i/ka' and 'un/nun'.

Linguistic Variability across Four Generations of Basque Spanish Speakers

Abstract The present study uses the apparent-time construct to analyze cross-generational variability of the preverbal double negation construction (i.e., yo tampoco no voy a la fiesta ‘I’m not going to the party either’), traditionally cited as a regional characteristic of the Spanish spoken in the Basque Country. An acceptability judgment task and a semi-structured interview were carried out among four different age groups. The results show that speakers of the two older generations tend to accept and produce the regional construction significantly more than speakers of the two younger generations, who favor the Standard Spanish variant (yo tampoco voy a la fiesta ‘I’m not going to the party either’). It is suggested that this trend is mainly due to the participants’ different language contact situations (Thomason and Kaufman, 1988) and levels of formal education. Since older speakers grew up in a situation of shift via interference and with lower levels of formal education, they prefer the preverbal double negation construction, which was already a norm in the regional Spanish. However, younger speakers grew up in a language maintenance situation and have relatively high formal education levels, factors that have conditioned dialectal leveling in this case.

Industrial Robot Digital Twin Application Technology

This paper mainly discusses the core position of the course "Industrial robot Application Technology" in the national double high construction professional group and the innovation of teaching methods. The "task-driven, process" of production-teaching collaboration built through digital twin technology aims to cultivate students' design development. The importance of the course "Industrial Robot Application Technology" is introduced. Teachers' teaching innovation team, national production training base and national science and technology innovation service platform support the digital development of this technology in intelligent manufacturing to create a digital twin teaching platform. In the course material content-based teaching design and the docking of industrial needs, including and industrial robot operation certification. In addition, the action-oriented teaching concept, ideological and political materials are integrated into the teaching design, and the paper emphasizes the teaching material compilation method and three-dimensional teaching material design. At the same time, it also has a potential impact on the expected model innovation of the application and promotion of teaching materials and continuing education.

The ditransitive construction and the double accusative construction as allostructions: Corpus-based analysis and pedagogical applications

The study explores the challenges encountered by Italian-speaking students with the learning of the German ditransitive construction. While prior research has extensively covered theoretical aspects of this construction, limited attention has been paid to its practical implications for foreign language learning.The study further elaborates on a related construction involving a similar semantics but realized with two accusative objects. Verbs which can fuse with this construction are e.g. lehren (‘to teach’), abfragen (‘to interrogate/to test’) or abhören (‘to test orally’). This related construction is often overlooked in language learning materials. The paper addresses this gap by combining empirical evidence from two pretests with Italian learners and a usage-based approach with corpus data, focusing on the verb lehren.The findings contribute to a better understanding and a more authentic description of the ditransitive construction. In a more theoretical perspective, the paper further discusses the relationship between the ditransitive and the double accusative construction in terms of ‘allostructions’, again with a focus on instantiations with the verb lehren. The insights gained with the study can help foster the learning of both constructions.

Comparing Comparatives

This article explores the acceptability of constructions with double comparative elements in Danish and English. First, a brief introduction to theoretical assumptions for adjective phrases and degree phrases is given. After this, the methodology and challenges of setting up an empirical study are laid out. The results of the acceptability study were that native speakers of Danish and English evaluated double comparative constructions as being rather unacceptable when compared with control sentences and standard comparative constructions.

Chain-mapping methods for relativistic light-matter interactions

The interaction between localized emitters and quantum fields, both in relativistic settings and in the case of ultra-strong couplings, requires non-perturbative methods beyond the rotating-wave approximation. In this work we employ chain-mapping methods to achieve a numerically exact treatment of the interaction between a localized emitter and a scalar quantum field. We extend the application range of these methods beyond emitter observables and apply them to study field observables. We first provide an overview of chain-mapping methods and their physical interpretation, and discuss the thermal double construction for systems coupled to thermal field states. Modelling the emitter as an Unruh-DeWitt particle detector, we then calculate the energy density emitted by a detector coupling strongly to the field. As a stimulating demonstration of the approach's potential, we calculate the radiation emitted from an accelerated detector in the Unruh effect, which is closely related to the thermal double construction as we discuss. We comment on prospects and challenges of the method.

Buffeting Characteristics of a Long-Span Cable-Stayed Bridge Crossing a Deep Canyon during Erection: Response Evaluation and Vibration Control

The stiffness of a long-span cable-stayed bridge under construction may be much lower than that observed in service, making it more susceptible to wind effects, especially for a bridge designed using high piers crossing a deep canyon. To study the buffeting characteristics of such cable-stayed bridges under construction, a long-span cable-stayed bridge (the main span is 575 m) is taken as the engineering background. In this study, the buffeting responses and vibration countermeasures at three different construction states were systematically studied using time-domain analysis. It was found that the buffeting response enlarges with an increase in the wind attack angle. The RMS values of the vertical buffeting of the bridge deck end are relatively greater at the maximum double cantilever construction state and maximum single cantilever state. At maximum double cantilever construction state, the traditional wind-resistant cable connecting the bridge deck end to the bridge pile cap significantly reduces the vertical buffeting response, while the suppression effect on lateral and torsional buffeting is limited. When the bridge deck nears completion, wind-resistant cables installed at both cantilever ending in the ‘soft connection’ method would effectively suppress the vertical, lateral, and torsional buffeting. The suppression effect of cross-arranged wind-resistant cables is superior to that of the parallel arrangement. It is recommended that a reasonable wind-resistant cable layout scheme according to different construction conditions is selected.

Janus from the synchronous construction of CN network and P-π conjugation: Inhibiting volume expansion and promoting lithium-ion battery performance of ZnSe

High-capacity lithium anode materials are very important for the development of lithium storage. However, the volume expansion and electron transport during charging and discharging hinder the development of high capacity and longevity. Herein, the three-dimensional P-π conjugate and nitrogen-doped carbon (CN) network framework was synchronously constructed by a simple and practical double construction strategy to solve the problems of volume expansion and electron transport. The experimental results indicate that the successfully synthesized transition metal zinc selenide (ZnSe) composites material possesses excellent electrochemical properties: an initial reversible capacity is capacity of 1211.8 mAh/g, and the reversible discharge capacity remains at 936.4 mAh/g after 300 cycles (at 1 A/g current density). It is much better than that of pure ZnSe. The enhanced electrochemical performances of the anode can be attributed to its high surface area and abundant mesopores constracted by the 3D CN network framework. Furthermore, the P-π conjugation reduces the system energy and thus accelerates the electron transport. These characteristics provide numerous pathways and sites for Li+ transfer and storage, thus contributing to the pseudo-capacitance capacity. The present work may provide new ideas and strategies for the solution of electrode material expansion and electron transport problems.

Research on the construction of interior design under the background of double high construction

Research on the construction of interior design under the background of double high construction

Multimanifold Bistructured Low Rank Representation of hyperspectral images

Hyperspectral images (HSIs) are obtained by imaging surface materials using a spectral imager. In practical applications, the hyperspectral remote sensing images are inevitably contaminated by noise, leading to errors in image processing results. Gaussian noise, Poisson noise, and stripe noise are common in HSIs. This article presents an HSI denoising model based on the low rank representation of multi manifold double constructions. Introducing multiple manifolds into the field of hyperspectral image denoising for the first time, comprehensively obtaining complex information on hyperspectral surfaces. We extended the graph-regularized low-rank representation model (GLRR) by using maximum data variance to construct global information. GLRR obtains local information, and the parallel effects of nearest neighbor and maximum variance graphs take into account both global and local consistency in the denoising process. Our model is not only applicable to the case of a single manifold, but also to the case of multiple manifolds, especially in the case of complex ground target images with multiple manifold spectra. Use the LADMAP iterative algorithm to iteratively solve the proposed algorithm. Avoid introducing auxiliary variables to reduce runtime costs and algorithm complexity. Both on simulated and real datasets, the runtime is relatively fast. We experiments on both real and simulated datasets, as well as real datasets, to verify that our method has good denoising performance when Gaussian, Poisson, and stripe noise occur simultaneously.

Application of Fuzzy-ISM-MICMAC in the Risk Analysis Affecting Swivel Bridge Construction Spanning Existing Railway Lines: A Case Study

Swivel bridge construction (SBC) technology has significant advantages in building bridges that span existing railway lines (ERLs), but it also entails complex risks from ‘skylight’ windows and railway boundaries. A notable challenge is the relationships and interdependencies among these risks, which collectively increase safety hazards through mutual influence. Prior research has typically focused on mitigating the risks inherent in particular tasks or operations, with less emphasis on the risks from interdependencies. A novel framework was developed to explore this research gap by integrating fuzzy logic, interpretive structural modeling (ISM) and the cross-impact matrix multiplication applied to classification (MICMAC) approach (Fuzzy-ISM-MICMAC) to investigate the relationships and interdependencies among the risks of SBC spanning ERLs and the critical points of risk control. Furthermore, the data collected from a literature review, a case analysis and expert interviews resulted in 28 risk factors. Then, the application of ISM distilled complex risk relationships into a clear, multilevel hierarchy, accurately illustrating the complex interrelationships among risk factors. Combined with MICMAC analysis, the research findings indicate that preliminary works such as the selection of construction technology, scheme design, construction rehearsal and the provision of safety facilities are essential for preventing risks in SBC spanning ERLs. We applied these findings to the double T-structure swivel construction of the Xiaojizhuang Bridge, where its practicality and efficiency were thoroughly tested and validated. This research’s critical contribution is identifying, clarifying and visualizing the interrelationships of the complex risk factors of SBC spanning ERLs and providing specific solutions for safety management in similar bridge construction projects. The research results and risk control recommendations offer valuable insights for managing other swivel bridge construction risks.

Clausal doubling and verum marking in Spanish

Abstract This paper offers a description and analysis of the clausal doubling construction, and contrasts it with predicate doubling based on their formal and verum-related properties. The study shows that the behavior of both patterns can be captured by extending the analysis of predicate doubling by Muñoz Pérez and Verdecchia (2022. Predicate doubling in Spanish: On how discourse may mimic syntactic movement. Natural Language & Linguistic Theory 40(4). 1159–1200). Basically, both doubling constructions have the same structure, with a contrastive topic in the left periphery; they differ, however, in the nature of the constituents carrying this function. The proposal derives from this single factor all formal and interpretative differences between the constructions. Moreover, the paper provides evidence to distinguish these phenomena from other verum-marking strategies in Spanish.

Optimization of foam-filled crash-box under axial loading for pure electric vehicle

To increase the energy-absorbing capability of frontal collision management systems and raise vehicle crash safety, foam-filled crash boxes should be optimized. On the basis of a double tubular construction, a novel foam-filled crash box with different design is developed. The energy absorption capacity, initial peak force and deformation modes of the original and improved crash boxes were examined using impact models. As opposed to the full-filling design, it is demonstrated that the filling design may utilize less foam while increasing specific energy absorption. The stability of the continuing deformation after the first buckling is determined by the foam filled crash-box combined. For the foam-filled crash box, a better optimized design technique is suggested using Radial Basic Function and Non-dominated Sorting GA II. Compression tests are used to validate the design concept. Therefore, the optimal design technique of the crash box is suitable and practical for the crashworthiness design of crash boxes, taking consideration the combined effect of significant indicators for electric vehicle.

EIS and relaxation times analysis of the electric double layer construction on Pt cathode surface in MgCl2 molten salt hydrate

The electric double layer on Pt cathode surface in the process of cathodic polarization was analyzed with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Raman spectroscopy, and Scanning electron microscope (SEM) in magnesium chloride (MgCl2) solution and MgCl2 molten salt hydrate (MSH). The effects of KCl on the structure of MgCl2 molten salt hydrate and electrode reaction were discussed. EIS data were fitted to propose the equivalent electric circuits to simulate the structure of electric double layers on Pt electrodes. Distribution of relaxation times (DRT) analysis was estimated to identify each process for MgCl2 solution and MgCl2 molten salt hydrate on the Pt cathode. The results show that the solution transforms into MSHs as the water content in the solution decreases. The solution and molten salt exhibit different double-layer properties. The movement of hydrated ions has greater resistance in MSHs which leads to the reduction of electrode reaction rate. The DRT and EIS results demonstrate that H+ and hydrated Mg2+ are simultaneously adsorbed on the Pt surface to form a double electric layer in MgCl2 solution or MSHs. In the MgCl2 MSHs, H+, H2O, and compact hydrated Mg2+ on the Pt electrode surface form a double layer. KCl plays an important role in changing the structure of MgCl2 molten salt hydrate, increasing the active H2O, and offering H+ adsorbed on the Pt surface.

A synergistic strategy of dual-crosslinking and loading intelligent nanogels for enhancing anti-coagulation, pro-endothelialization and anti-calcification properties in bioprosthetic heart valves.

Currently, glutaraldehyde (GA)-crosslinked bioprosthetic heart valves (BHVs) still do not guarantee good biocompatibility and long-term effective durability for clinical application due to their subacute thrombus, inflammation, calcification, tearing and limited durability. In this study, double-modified xanthan gum (oxidized/vinylated xanthan gum (O2CXG)) was acquired from xanthan gum for subsequent double crosslinking and modification platform construction. Sulfonic acid groups with anticoagulant properties were also introduced through the free radical polymerization of vinyl sulfonate (VS) and vinyl on O2CXG. Taking advantage of the drug-loading function of xanthan gum, the treated pericardium was further loaded with inflammation-triggered dual drug-loaded nanogel (heparin (Hep) and atorvastatin (Ator)). Mechanical properties of O2CXG-crosslinked porcine pericardium (O2CXG-PP) were significantly improved via the first network formed by Schiff base bonds and the second C-C bonds network. Due to the presence of sulfonic acid groups as well as the dual drug release from nanogels under the stimulation of H2O2, the hemocompatibility, anti-inflammatory, pro-endothelialization and anti-calcification properties of the crosslinked pericardium modified with nanogels loaded with Hep and Ator (O2CXG+VS+(Hep+Ator) nanogel-PP) was significantly better than that of GA-crosslinked PP (GA-PP). The collaborative strategy of double crosslinking and sequential release of anticoagulant/endothelium-promoting drugs triggered by inflammation could effectively meet the requirement of enhanced multiple performance and long-term durability of bioprosthetic heart valves and provide a valuable pattern for multi-functionalization of blood contacting materials. STATEMENT OF SIGNIFICANCE: Currently, glutaraldehyde-crosslinked bioprosthetic heart valves (BHVs) are subject to subacute thrombus, inflammation, calcification and tearing, which would not guarantee good biocompatibility and long-term effective durability. We developed a cooperative strategy of double crosslinking and surface modification in which double-modified xanthan gum plays a cornerstone. The mechanical properties of this BHV were significantly improved via the first network formed by Schiff base bonds and the second C-C bonds network. Inflammation-triggered combination delivery of heparin and atorvastatin has been demonstrated to enhance anticoagulation, anti-inflammatory and pro-endothelialization of BHVs by utilizing local inflammatory response. The collaborative strategy could effectively meet the requirement of enhanced multiple performance and long-term durability of BHVs and provide a valuable pattern for the multi-functionalization of blood-contacting materials.

Heterojunction of Y3+-substituted Na3V2(PO4)3-NaYO2 accelerating kinetics with superior performance for full sodium-ion batteries

The inherent poor ionic and electronic conductivity and relatively low capacity seriously limit the development of Na3V2(PO4)3 (NVP). Currently, Y3+ substitution is proposed for the first time and corresponding Y-doped NVP samples are successfully synthesized by traditional solid phase method. By replacing V3+ (0.64 Å) of Y3+ (0.9 Å) with large ionic radius, the transport channel of Na+ is expanded, accelerating the migration rate of Na+. Meanwhile, the strong Y-O chemical bond reinforces the crystal structure of NVP and improves its stability. It is worth noting that Y3+ reacts with slightly excess Na+ during the sintering process to form a new conductive phase NaYO2 coated on the surface of NVP particles. NaYO2 possesses excellent semiconductor properties and can form a double conductive construction together with the amorphous carbon layer to improve the kinetics of NVP system. Moreover, the unique heterojunction could be generated between the boundaries of Na3V2(PO4)3-NaYO2, further elevating the ionic conductivity. According to the investigations of ex-situ XRD and in-situ EIS, NaYO2 can provide active Na+, participating in the electrochemical process to supply extra reversible capacity. Comprehensively, the optimized NVP-Y0.07/C releases a high capacity of 125.2 mAh/g at 0.1 C, far exceeding the theoretical value of NVP (117.6 mAh/g). Even at 60 C, a high specific capacity of 94.2 mAh g−1 can be achieved. When cycled at 250 C, it maintains 85.5 % after 2000 cycles. Besides, the assembled NVP-Y0.07/C//hard carbon full cell can deliver a reversible value of 118.2 mAh/g, suggesting the superior practical application potentials.

Nijenhuis operators and associative D-bialgebras

Firstly, we prove that a quasitriangular associative D-bialgebra together with a coquasitriangular structure can induce a Nijenhuis algebra. This shows that Nijenhuis operators and associative D-bialgebras are closely related. Secondly, we investigate some properties of a representation of a Nijenhuis algebra and introduce the notion of a corepresentation of a Nijenhuis coalgebra, which also can be seen as an infinitesimal deformation of compatible bicomodule. Thirdly, a Nijenhuis associative D-bialgebra can be established by a Nijenhuis algebra and a Nijenhuis coalgebra satisfying some compatible conditions. Furthermore, we find that a Nijenhuis associative D-bialgebra is equivalent to a matched pair of Nijenhuis algebras or a double construction of a Nijenhuis Frobenius algebra. Lastly, we provide some methods to construct Nijenhuis associative D-bialgebras through admissible associative Yang-Baxter equations (aYBes for short) and O-operators on Nijenhuis algebras.