bluuebunny/crossref_metadata_2025 huggingface dataset:
The Design and Mechanical Study of the Pipe Joint Structure in a High-pressure Hydraulic System
Authors: Dong Shengxu , Liu Qiang , Li Jing
Published: December 2023

Pipe joints are important connecting devices and weak links in high-pressure hydraulic systems, and their rational design is of great significance for ensuring the safety of hydraulic transmission systems. In accordance with the requirements of high-pressure hydraulic oil systems, a 70 MPa high-pressure oil pipe structure was designed, and strength and sealing analyses were conducted by using the finite element module in SolidWorks simulation. The results showed that the stress distribution in various parts of the pipe joint was relatively uniform and achieved an elastic-plastic sealing effect. The radius of curvature on the outer wall of the pipe is a key factor in joint design, and the connectivity performance of the joint can be adjusted by the axial displacement of the connector. The sealing tests demonstrated that the pipe design meets the structural strength and sealing performance requirements for use at 70 MPa. The research findings provide references for optimizing the design, manufacturing, and installation of pipe joints in high-pressure hydraulic systems.
Design and Verification of Rotating Avoiding Type Locking-Releasing Mechanism
Authors: Liu Wei , Zhou Yiming , Wang Chunjie , Ding Jianzhong
Published: December 2023

Given the resistance environment and rotation requirements of the satellite payload module, a horseshoe-shaped compression slider bearing method and a double-layer structure shear resistance method are proposed. A rotating avoiding type locking-releasing mechanism is designed, which has a large bearing capacity and reliable locking, and can leave a sufficient rotation avoidance gap for the payload module after release. Then, the analysis and design process of preload is given, and the axial tensile and transverse shear tests are carried out to verify the reasonableness and feasibility of the designing scheme, which solved the technical problem of rotating operation of the 2-ton payload module after enduring the harsh mechanical environment effectively, and can be applied to the task of locking and releasing the same kind of rotating type payload in the resistance environment.
Hierarchical Error Compensation Method for Two-Degree-of-Freedom Manipulator Positioning Error in Hybrid Robots
Authors: He Yuqing , Zhang Jiabo , Yue Yi , Liu Jingyu , Wen Ke , Zhou Yinghao , Yang Jizhi , Wang Yunpeng
Published: December 2023

In this paper, taking a two-degree-of-freedom parallelogram serial manipulator of a hybrid robot as an example, a hierarchical error compensation method that combines geometric and non-geometric error compensation is proposed. First, we establish the geometric kinematic modeling and error model and use the Levenberg-Marquardt (L-M) method to identify the geometric error parameters. Then, we use the grid interpolation method to compensate for non-geometric errors, thereby improving the overall positioning accuracy of the manipulator. Finally, a simulation is presented to verify the correctness and effectiveness of the proposed method. The results show that the positioning accuracy is improved from 4.8568 mm to 0.0036 mm, and the attitude error is improved from 0.9437° to 0.0105°.
Aviation Collision Risk Warning for Non-Tower Airport Based on Trajectory Prediction
Authors: Yang Lijian , Zeng Zhuo , Liu Kai , Zi Feiyue , Wang Yazhong
Published: December 2023

With the development of the civil aviation industry, the throughput of airports continues to increase, including non-tower airports (small airports without the ability to actively communicate with aircraft). These non-tower civil airports can handle small aircraft such as personal aircraft well and lay a solid foundation for future automated aircraft. However, there is a high collision risk in taking off or landing because the probability of avoiding risks highly relies on the pilot’s flight proficiency and experience. To address this problem, we studied the collision risk of aircraft in non-tower airports and proposed a collision risk warning method based on trajectory prediction. The proposed method obtains the probability of future collisions by learning the flight patterns of all aircraft in non-tower airports, the impact of environmental wind speed on pilot behavior, and the interaction patterns between aircraft. At the same time, we conducted in-depth optimization of the probability integration calculation process under a conditional threshold to reduce the time complexity greatly. The simulation experiment results on non-tower airports show that the designed method for collision risk warning can effectively address the aircraft collision prediction problem in non-tower airports, and outperform other benchmark learning methods. It has significant guiding implications for improving airport intelligence and aircraft automation in the future.
Optimization Design of Electromagnetic Bearing for Long-life Centrifugal Pump
Authors: Li Yuanyan , Sheng Chao , Zhang Bin , Zhao Jian , Du Guofei
Published: December 2023

Aiming at the problems of traditional centrifugal pump mechanical bearing, short life, low speed, and difficulty solving of motion sealing, it is carried out to adapt to the design of electromagnetic bearing design that is suitable for liquid work quality and high pressure, and the rationality of the structural design is verified through electromagnetic field simulation and experimental testing. The results show that: (1) Through electromagnetic field simulation analysis of electromagnetic bearings, under a working gap of 0.3 mm and a working current of 2 A, the electromagnetic force is 129.7 N, meeting the bearing capacity requirement of 124 N; (2) Through simulation analysis of the magnetic field of electromagnetic bearings under different pole arrangements, to reduce the mutual coupling between magnetic circuits, the radial electromagnetic bearings should adopt a circumferential NSSN pole arrangement; (3) Through the analysis of the impact of working current on the performance of electromagnetic bearings, when the current is below 1.8 A, the electromagnetic force is proportional to the square of the current; when the current increases from 1.8 A to 3 A, the electromagnetic force is not obvious with the increase of current, showing nonlinear characteristics. Therefore, when designing the electromagnetic bearing, the maximum magnetic induction intensity selected is generally the critical point of the linear interval, so that the electromagnetic bearing works in the linear interval.
Dynamics Analysis Research of Large Pipe System of Launch Vehicle in Low Temperature
Authors: Wang Shuai , Zhang Xinyao , Wu Linna , Ni Fei , Zhou Yuguo
Published: December 2023

Assembly constraints and load conditions are very complicated for large-diameter pipe systems in low temperatures of launch vehicles. It might not be possible to simulate realistic flight conditions on ground tests. Malfunctions may occur if the vibration environment and constraint condition are not fully considered. Launch vehicles might burn and explode in serious conditions. The paper studies dynamics simulation and analysis methods of pipe systems by choosing stereotypes of large-diameter pipe systems in low temperatures, including the modeling and analysis for simulation. The comparison between experiment results and analysis outputs shows the validity of the modeling and analysis methods, offering technical support for the future simulation of pipe system loading conditions.
Future application and prospect of space electron beam processing technology
Authors: Ma Yanlong , Zhao Jipeng , Yang Wenbo , Ma Tianju , Gu Sendong , He Jun , Yu Bin , Tang Xiaoyan
Published: December 2023

Technological advances in space electron beam processing could fundamentally alter how spacecraft and space stations are built. The primary topics covered in this essay are the application circumstances for electron beams in space, the research situations for electron beam welding, additive manufacturing, and surface modification, and an analysis of the potential future applications for this technology. It demonstrates the viability of space applications of electron beam processing technologies.
A Refined Analysis Method for Flight Safety Based on a Multi-stage Reliability Model
Authors: Yi Kai , Li Shuo , Gu Changchao , Chen Zhiwei
Published: December 2023

Flight verification is an indispensable key step in the process of aircraft development. Due to the inevitable existence of protected targets in and around the flight area, the accidental crash of aircraft during flight will pose a threat to the protected targets, so it is necessary to carry out a quantitative analysis of flight safety risks. To meet the requirements of flight safety risk quantitative analysis and improve the refinement degree of risk quantification, this paper proposes a flight safety refinement analysis method based on a multi-stage reliability model. Firstly, the failure modes of the aircraft flight process are summarized, and then the stage distribution logic analysis method and quantitative calculation method of failure modes are proposed. Finally, the target threat probability calculation model is given, which realizes the quantitative evaluation of the safety risk of the flight area and provides support for the optimization design of the flight safety control area.
Analysis of the Influence of Condensation on the Mechanical Properties of Corrugated Compensators in Pressure Pipelines
Authors: Yang Zilong , Yang Fujiang
Published: December 2023

The reliability design of pressure pipelines under special conditions such as high temperature, high pressure, and even state transformation, includes an essential section on the performance analysis of the corrugated compensator. Based on powder mechanics, a model for the accumulation of condensate in the corrugated compensator was established, and the flow-solid coupling issue was resolved by simulating the condensation process through adjustments to the wall pressure. As a consequence of simulations, the characteristic curve of the condensation process of shortening and subsequently elongation was discovered. The study implies that condensation can produce additional stress that is up to four times greater than the normal state. This additional stress increases with condensate density and the condensate’s proximity to fluid characteristics. This research provides guidance for designing pressure pipeline operating conditions, predicting and monitoring medium condensation, and corrugated compensator failure analysis.
Research on automatic flight control system flight mode operation logic
Authors: Liu Shu , Zhou Chao , Shao Hui , Liu Chang , You Senbin
Published: December 2023

The auto-flight system of modern civil aircraft is the main man-machine interaction system, and its flight mode operation function is jointly completed by FMCP hardware and auto-flight control system software. In order to achieve a complex flight mode operation control logic design, first the hardware and software composition and specific functions of flight mode operation control are clarified. Then the flight mode operation function is refined and logically sorted out. Finally, the software and hardware models of flight mode operation control are established through Simulink. This paper verifies whether the realization of the mode operation control function meets the expectation.
The Modeling and Simulation of Turbulence for Civil Aircraft Compliance Verification Test
Authors: Qiao Wenfeng , Wu Shengcong
Published: December 2023

For the airworthiness compliance verification of civil aircraft, the response of the aircraft in turbulence is one of the most important tests. Turbulence is mentioned in many airworthiness regulations for civil aircraft, but there are no clear requirements. To study the compliance of civil aircraft response in an atmospheric turbulence environment, the airworthiness requirements of civil aircraft were analyzed. The turbulence model that can be used for airworthiness compliance of civil aircraft was determined for the first time. In this paper, the principle of the atmospheric turbulence model is studied. The evaluation process of the model is proposed, which indicates that the turbulence model meets the airworthiness requirements. At the same time, the model was integrated on a certain simulator, and the correctness of the integration was proved through integration testing. The modeling, evaluation, and integration process of the turbulence model proposed in this paper can be used for the airworthiness verification of civil aircraft.
Research on key process parameters and characteristic vibration of steam turbine shafting
Authors: Shi Zhenyi , Sun Tao , Liu Yingzhuo , Yang Xinyu , Li Wei
Published: December 2023

Steam turbines are a major source of vibration and noise when submarines are working. How to improve the technological level of steam turbines and reduce the vibration generated by them so that submarines can achieve the purpose of acoustic stealth has always been a hot topic of research. However, blindly improving the overall technological level of steam turbines will not only increase the manufacturing cost but also prolong the manufacturing cycle of submarines. Therefore, this paper makes a reasonable model of each type of process parameter for a certain type of steam turbine design drawings for ships. Subsequently, a dynamic model of the steam turbine shafting based on the transfer matrix was established, and experiments were designed on five groups of design parameters with strong vibration sensitivity of the steam turbine shafting. The vibration response calculation under multiple process parameters of the steam turbine shafting was carried out in combination with the two. The connection between the key process parameters of the steam turbine shafting and the characteristic vibration was established, and the influence mechanism of the key process parameters of the steam turbine shafting on the characteristic vibration was analyzed.
Luminescent carbon quantum dots: synthesis and optical applications
Authors: Kumar Avinash , Kumar Ishant , Kumar Sandeep , Gathania Arvind K
Published: December 2023

In the current study, carbon nanoparticles i.e., carbon quantum dots have been prepared via the hydrothermal method using Citrus limon juice as a precursor. The method used is low-cost and environmentally friendly, besides the precursor is easily available and non-toxic. Various studies were performed on the synthesized CQDs to gain insight into the functional groups present on their surface, excitation and emission spectra, and their photostability. The obtained results showed that CQDs show various functional groups on their surface, emission and excitation bands are broad rather than characteristic peaks, the emission is excitation dependent, Temperature-dependency of photoluminescence, and good photostability in large salt concentrations, with UV-irradiation and storage time of CQDs. These characteristics suggest that the synthesized CQDs can find applications in metal ion detection, cell imaging, drug delivery, and many optoelectronic devices.
Suppression of stimulated Raman scattering in magnetized plasma channel
Authors: Khan Khalid , Kamboj Oriza , Kant Niti , Rajput Jyoti
Published: December 2023

The current study illustrates the occurrence of Stimulated Raman Scattering (SRS) within a plasma channel characterized by magnetized density conditions. Stimulated forward Raman scattering takes place when a laser beam with a q-Gaussian profile traverses a plasma while being exposed to a wiggler magnetic field. The coupling between the applied magnetic field and the generated Langmuir wave ensures the Raman process generation. As a result, second Langmuir wave is produced which remains strongly damped on the electrons. An external magnetic field is employed for the effective suppression of the SRS. The initial enhancement in the growth rate is observed with the magnetic field and after attaining the maxima, it suppresses with the growth rate.
Structural and optical characteristics of Cu-doped CdS composite thin films
Authors: Sharma Jagmohan Lal , Mishra M.C. , Jain S.K. , Tripathi Balram
Published: December 2023

In this paper spin-coating method is used to create copper doped CdS composite thin films on glass substrates. Prepared Cux (CdS)1-x composite thin films, where x=1, 3 and 5 wt% Cu doped, have been characterised using an X-ray Diffractometer (XRD), scanning electron microscope (SEM) and UV-Visible spectrometer. These measurements provide the structural, morphological and optical properties of both pure and Cu doped CdS. The XRD pattern was used to examine the crystal structure and grain size of the CdS thin film. The optical spectra show absorption and band gap values of prepared samples. The band gap values have been found between 2.41 to 1.71. The photoluminescence (PL) spect rum emitted a strong peak approximately 430 nm which shows better optical quality for many applications.
Effect of Chemical Pre-treatment on Screen Printed Fabric Performance Properties
Authors: Ramaiah G.B. , Mequanent A. , legese R. , Solomon E. , Asfaw D.
Published: December 2023

Printing is the process of transferring a specific pattern or design onto the surface of textile fabric. In the printing process, screen printing is one of the fundamental printing methods on textiles and is widely used worldwide. However, screen-printed fabrics have specific properties like fastness, water absorbency, and whiteness index that increase the end-use properties of the printed fabrics. There are several factors that affect the technical characteristics of printed fabrics. This research focuses on an experimental approach to ascertain and confirm the pre-treatment process as one of the most important factors in pigment dye screen-printed fabrics. The main raw material used in this research was 100% cotton fabric with a plain weave structure. The experimental method used in this research involved the pre-treatment (singeing, scouring, and bleaching) process with different recipes and four samples. Screen-printed fabric after printing was tested for its technical properties using standard test methods. The results of a one-way ANOVA (Analysis of Variance) were analysed using MINITAB and Microsoft (MS) Excel software. The results indicate superior fabric technical properties like color fastness to rubbing and washing, coupled with improved water absorbency and excellent whiteness index values of samples printed after bleaching with Hydrogen Peroxide (H2O2). In this research, we conclude that printed fabric after bleaching with H2O2 has the best color fastness, and bleaching with NaOCl is the next one. However, printed fabric has a low fastness property after scouring and singeing.
A review on synthesis of graphene oxide and its functionalization through ion irradiation methods
Authors: Jose Maria , Joseph Jaiby , Mathews Mercy
Published: December 2023

Graphene is a monoatomic layer of sp2 hybridized carbon atoms, which is two-dimensional and has unique electrical, magnetic and mechanical properties. Pristine graphene is inert in nature and limited in its applications. Doping can enhance the properties of graphene. Several efforts have been done recently to tune its properties through doping, which will provide precise control over its structure and properties. In this review, different methods of doping graphene especially chemical versus irradiation methods and their effects are summarized. Moreover, the advantages of ion irradiation techniques in doping are also discussed based on the available experimental results.
Study of crystalline size and strain in rare earth doped Cu modified BZT
Authors: Lather Aryan Singh , Poonia Kanika , Kundu R S , Ahlawat Neetu , Nehra Anuj , Kaur Shubhpreet
Published: December 2023

In three-dimensional cation-oxygen connections, rare earth replacement induces A-site vacancies and deformation, resulting in stochastic local strain with short range coherence. This will modify the electrical and conductive properties of Barium Zirconate Titanate (BZT). Therefore, to make different research on BZT based materials, the study of induced strain and structural modifications due to rare earth doping is necessary. In this context, the current study involves the synthesis of rare earth (Er/Ho) and Cu co-modified Barium Zirconate Titanate (BZT) through a conventional solid state reaction method. The X-ray diffraction (XRD) technique is utilized to gather data for structural analysis such as phase, space group, and lattice parameters for 0.98(BaZr0.05Ti0.95O3)-0.02(CuO:Er2O3) and 0.98(BaZr0.05Ti0.95O3)-0.02(CuO:Ho2O3). Moreover, from the XRD data, the induced strain and crystalline size for differently doped BZT samples have been analysed. In addition to this, Raman spectroscopy is used to authenticate the results obtained from XRD. A successful comparison has been carried out to assess the impact of doping elements and their concentrations on the structural characteristics of the base material BZT.
X-ray Photoelectron Spectroscopy and Optical Studies of Assembled Gold Clusters
Authors: Dash Pragyan Paramita , Rath Satchidananda
Published: December 2023

The electronic structures and optical properties of assembled gold nanoclusters prepared through wet chemical method have been investigated. The scanning electron microscopic analysis revealed gold clusters growing into beaded nanowires. The core level electronic states of the samples analyzed using X-ray Photoelectron spectroscopy, confirm the presence of gold. Further, the shift of core 4f orbitals towards higher energy indicates the interaction between Au and ligand in comparison with the bulk counterpart. The appearance of a sharp peak at 371 nm in the optical absorption spectrum refers to the excitonic transition between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) states. The luminescence peak observed at 403 nm and 615 nm may be due to the transitions between HOMO-LUMO gaps and the surface states and/or states originating from cluster-ligand interactions, respectively.
Simulation of Colloidal Dispersion of Spherical Particles Interacting Via a Linear Combination of Dispersive and Screened Yukawa Potential
Authors: Bayen Moushila , Kumar Anupam , Mishra Pankaj
Published: December 2023

We have considered a two-dimensional colloidal dispersion of spherical particles interacting via a linear combination of Hamaker type dispersive potential and screened Yukawa potential. We have compared the pair correlation functions (g(r)) calculated from isothermal isochoric (NVT) Monte Carlo simulation with the PCF obtained by solving PercusYevick (PY) integral equation theory, at six values of reduced densities ranging from 0.03 to 0.11, keeping the relative strength of two types of potential fixed. Structure factors are calculated by Fourier transform of total PCF (h(r)).
Alpha clustering in 41, 45, 49Ca* nuclei formed in neutron induced reactions
Authors: Kaur Manpreet , Singh BirBikram , Patra S. K. , Raina P. K.
Published: December 2023

The light neutron-rich nuclei play a vital role in nucleosynthesis process and the extent of alpha (α) clustering significantly influence the astrophysical rates. Thus, it is significant to explore the α clustering in these nuclei and in the present work, we have studied the α clustering in 41,45,49Ca* nuclei formed in neutron induced reactions within the dynamical cluster decay model (DCM). The results present that with progression towards neutron-rich 45Ca* and 49Ca* nuclei, there is a significant decrease in the α-cluster preformation factor P0. The inclusion of relativistic mean field theory (RMFT) based microscopic temperature-dependent binding energies (T.B.E.) within DCM, give relatively enhanced α-cluster preformation factor for 41,45,49Ca* nuclei compared to the case of macroscopic T.B.E. based upon Davidson mass formula. The cross-section associated with α-cluster emission depicts strong isospin dependence and falls off significantly with increasing neutron number of Ca* nuclei. Further, for the first time, we inculcate the microscopic nuclear potential constructed via folding the standard Fermi form fitted RMFT cluster densities and M3Y nucleon-nucleon interaction within the DCM. The neutron skin thickness of the Ar cluster, complementary to α-cluster, is varied and its effect upon the nuclear interaction potential and α-cluster preformation factor is analysed. The results present that with growing neutron skin of Ar cluster, the α-cluster preformation factor decreases. It explores a strong correlation among the neutron skin thickness and α-cluster preformation factor in light mass 41,45,49Ca* nuclear systems.
Material characterization by using T- stub based microstrip patch sensor
Authors: Kaur Swaranpreet , Singh Surinder , Sinha M M
Published: December 2023

In this article, a dual port T-stub based planar sensor is designed with defective ground structure to analyze the properties of lossless dielectric material. The observation is done on the basis of reflection response i.e., S11 and also by analyzing imaginary part (reactive part) of z-parameters (Z11, Z21). This proposed sensor is applicable to sense the relative permittivity in the given range i.e., ϵr =1-12. In this study, the capacitive response of the sensor is analyzed with varying relative permittivity of material under test (MUT). It is found that with increase in the relative permittivity of MUT, the capacitance of the sensor increases and therefore significant shift in frequency is observed.
Cosmological models with variable parameters
Authors: Jain Navya , Dua Heena , Mishra R K
Published: December 2023

The present study deals with the investigation of the Friedmann-Lemaitre-Robertson-Walker models (often FLRW-models) with time varying G and ∧ in the framework of General theory of Relativity. The Einstein field equations have been solved by considering the time-varying deceleration parameter q(t) and Scale factor

α
(
t
)
=

e

β
t

+
(
sinh
β
t

)

1
m

, where m and β are arbitrary constants. We have analysed the value of m, which will generate a transition for universe from early decelerating phase to recent acceleration phase. The physical and graphic behaviour have also been planned to study in this communication.
Comparative studies of α-decay channel from 144Nd* and 148Sm* populated via neutron induced reactions
Authors: Chhetri Rita , Sharma Mahinderpal , Kaur Jagdeep , Kaur Amandeep
Published: December 2023

A comparative study of α-decay channel from the composite systems 144Nd* and 148Sm* populated via n-induced reactions- n+143Nd and n+147Sm, is done at Ebeam=5.0 MeV. The study proceeds through the Dynamical Cluster-decay Model (DCM) as suggested by an experiment performed by Gledenov et al. at Peking University, China. An attempt is made to do a theoretical investigation of decay profiles of 144Nd* and 148Sm* to analyze the effect of temperature, neck-length and angular momentum state of the hot-rotating system at common beam energy. The results are exhibited in the form of variations in fragmentation structure and the barrier modification effects that are illustrated from the barrier penetration profiles. Additionally, a competing analysis of light charge particle emission is done where the cumulative contribution of α-emission towards the decay channel is depicted in contrast to the contribution from other light particles (n, 2n,3n) or light charged particles (3H) for both the decaying systems 144Nd* and 148Sm*.
Visual object detection using audio data
Authors: Chaturvedi Rajnish Kumar , Sahu Dinesh Prasad , Tyagi Manoj Kumar , Diwakar Manoj , Singh Prabhishek , Shankar Achyut , Sathishkumar V E
Published: December 2023

Nowadays Internet of Things (IoT) and Machine Learning (ML) are growing fields. One application of these two fields is object detection, which detects semantic objects using digital images and videos of classes like humans, vehicles, buildings, etc. Visual object detection systems are very effective and accurate due to the appearance information obtained from the cameras. But they face the problem of a limited Field of View. This paper aims to tackle this issue by using audio data to localize the object. A microphone is used to estimate the angular position of the object emitting the sound. Objects currently in the Field of View of a camera are detected and tracked using optical flow, but when they go out of the Field of View, the sound emitted by the object is used by the microphone to calculate the object‘s angular position. Once the angle is calculated, the camera is rotated in that direction. This thus ensures that the object can be located even if it goes out of frame. Once the object is located through IoT devices, we use ML to identify the person‘s face.
Characterization of New Algebras Resembling Colour Algebras based on Split-Octonion units in the Classification of Hadronic Symmetries and Supersymmetries
Authors: Burdik Čestmir , Catto Sultan , Gürcan Yasemin , Khalfan Amish , Nicolescu Bogdan
Published: December 2023

We report on some new algebras we discovered that does not appear in mathematics or physics literature which we briefly name “R” algebras. Together with the real forms we developed for supersting theories shown below and dobbed as “l” algebras, both these new algebras seem to imitate split-octonionic multiplication rules we expose below. We further elaborate on Jordan algebras, magic squares, seven spheres, and supergravity, pointing to the existence of a larger theory with a 27-dimensional lattice and unifying all known superstring theories.
T-Duality and Lie bialgebroid structures
Authors: Cardona Alexander , Villamarín Juan José
Published: December 2023

We show that the geometric notion of duality behind T-duality, between two string theories on different manifolds E, Ê in the sense of [3][4], is precisely that of Lie bialgebroids due to Mackenzie and Xu [11].
T-duality relations between hyperkähler and bi-hypercomplex structures
Authors: Kimura Tetsuji , Sasaki Shin , Shiozawa Kenta
Published: December 2023

We investigate the T-duality relations between hyperkähler and bi-hypercomplex structures using the doubled formalism. In generalized geometry, both the hyperkähler and bi-hypercomplex structures are embedded in generalized hyperkähler structures that satisfy the split-bi-quaternion algebra. We write down the analogue of the Buscher rule, which is the T-duality transformation of the hyperkähler and bi-hypercomplex structures. As a practical example, we construct the bi-hypercomplex structure of the

5

2

2

-brane, known as a T-fold, from the hyperkähler structure of the Taub-NUT space using the T-duality transformation. The bi-hypercomplex structures of the T-fold have non-trivial monodromies. This results in the fact that the worldsheet instantons on the T-fold are multi-valued. We comment on the resolution of this issue using the Born sigma model.
Transmuted spectrum-generating algebras and detectable parastatistics of the Superconformal Quantum Mechanics
Authors: Toppan Francesco
Published: December 2023

In a recent paper (Balbino-de Freitas-Rana-FT, arXiv:2309.00965) we proved that the supercharges of the supersymmetric quantum mechanics can be statistically transmuted and accommodated into a

Z

2

n

-graded parastatistics. In this talk I derive the 6 = 1 + 2 + 3 transmuted spectrum-generating algebras (whose respective

Z

2

n

gradings are n = 0, 1, 2) of the 𝒩 = 2 Superconformal Quantum Mechanics. These spectrum-generating algebras allow to compute, in the corresponding multiparticle sectors of the de Alfaro-Fubini-Furlan deformed oscillator, the degeneracies of each energy level. The levels induced by the Z
2 × Z
2-graded paraparticles cannot be reproduced by the ordinary bosons/fermions statistics. This implies the theoretical detectability of the Z
2 × Z
2-graded parastatistics.
Quantum geodesic flow on the integer lattice line
Authors: Beggs Edwin , Majid Shahn
Published: December 2023

We use a recent formalism of quantum geodesics in noncommutative geometry to construct geodesic flow on the infinite chain · · · •–•–• · · ·. We find that noncommutative effects due to the discretisation of the line generically cause an initially real geodesic flow amplitude ψ (for which the density is |ψ|2) to become complex. This has been noted also for other quantum geometries and suggests that the complex nature of the wave function in quantum mechanics (and the interference effects that follow) may have its origin in a quantum/discrete nature of spacetime at the Planck scale.
ℤ2 × ℤ2-graded Lie algebras and supseralgebras and related physical models
Authors: Kuznetsova Zhanna , De Souza Lucas Vasconcellos
Published: December 2023

In this paper we construct physical systems with ℤ2×ℤ2-graded symmetries. There are two different structures:ℤ2×ℤ2-graded Lie algebras andℤ2×ℤ2-graded Lie superalgebras. Physical models with the latter symmetries can be seen as generalizations of supersymmetric models. The systems described by ℤ2 × ℤ2-graded Lie algebras have not been investigated yet (up to our knowledge). We present examples of physical models invariant under each one of both kinds of graded structures.
On Yang–Mills fields from anti-de Sitter spaces
Authors: Kumar Kaushlendra
Published: December 2023

Motivated by some recent progress involving a non-compact gauge group, we obtain classical gauge fields using non-compact foliations of anti-de Sitter space in 4 dimensions (required dimensionality for conformal invariance of Yang–Mills theory) and transfer these to Minkowski spacetime using a series of conformal maps. This construction also builds upon some previous works involving SU(2) gauge group in that we now use its non-compact counterpart SU(1, 1) here. We note down gauge fields in both Abelian as well as non-Abelian settings and find them to be divergent at some hyperboloid, which is a hypersurface of co-dimension 1 inside the conformal boundary of AdS4. In spite of this hurdle we find a physically relevant field configuration in the Abelian case, reproducing a known result.
Higher category theory and n-groups as gauge symmetries for quantum gravity
Authors: Nikolić Bojan , Obrić Danijel , Radenković Tijana , Salom Igor , Vojinović Marko
Published: December 2023

Higher category theory can be employed to generalize the notion of a gauge group to the notion of a gauge n-group. This novel algebraic structure is designed to generalize notions of connection, parallel transport and holonomy from curves to manifolds of dimension higher than one. Thus it generalizes the concept of gauge symmetry, giving rise to a topological action called nBF action, living on a corresponding n-principal bundle over a spacetime manifold. Similarly as for the Plebanski action, one can deform the topological nBF action by adding appropriate simplicity constraints, in order to describe the correct dynamics of both gravity and matter fields. Specifically, one can describe the whole Standard Model coupled to gravity as a constrained 3BF or 4BF action. The split of the full action into a topological sector and simplicity constraints sector is adapted to the spinfoam quantization technique, with the aim to construct a full model of quantum gravity with matter. In addition, the properties of the gauge n-group structure open up a possibility of a nontrivial unification of all fields. An n-group naturally contains additional novel gauge groups which specify the spectrum of matter fields present in the theory, in a similar way to the ordinary gauge group that prescribes the spectrum of gauge vector bosons in the Yang-Mills theory. The presence and the properties of these new gauge groups has the potential to explain fermion families, and other structure in the matter spectrum of the theory.
On the solutions of universal differential equation
Authors: Bui V C , Hoang Ngoc Minh V , Ngo Q H , Nguyen D V
Published: December 2023

The objective of this work is to give expressions for solutions of universal differential equation and finally, as application, provides the unique grouplike solution, by dévissage, of Knizhnik-Zamolodchikov equation satisfying asymptotic conditions, i.e. solution of KZn
can be obtained using solution of KZ

n−1 and the noncommutative generating series of hyperlogarithms. These expressions are obtained using the algebraic combinatorics on noncommutative formal series with holomorphic coefficients and a Picard-Vessiot theory of noncommutative differential equations.
Topology of Hawking-Page transition in Born-Infeld AdS black holes
Authors: Yerra Pavan Kumar , Bhamidipati Chandrasekhar , Mukherji Sudipta
Published: December 2023

Black holes in anti de Sitter spacetimes undergo phase transitions which typically lead to the existence of critical points, that can be classified using topological techniques. Availing the Bragg-Williams construction of an off-shell free energy we compute the topological charge of the Hawking-Page (HP) transition for Einstein-Born-Infeld black holes in anti de Sitter (AdS) spacetime and match the result with the confinement-deconfinement transition in the dual gauge theory, which turn out to be in perfect agreement.
Bogoliubov-de Gennes equation on graphs: A model for tree-branched Majorana wire network
Authors: Akramov M. , Askerzade I. , Salati M. , Karpova O.
Published: December 2023

We consider Bogoliubov-de Gennes equation on a metric tree graph. Formulation of the problem for arbitrary graph topology is provided. Self-adjoint vertex boundary conditions are derived. Exact solutions of the problem is obtained for quantum tree graph. A quantum graph based model for tree-branched Majorana wire network is proposed.
Polynomial algebras from commutants: Classical and Quantum aspects of 𝒜3
Authors: Campoamor-Stursberg Rutwig , Latini Danilo , Marquette Ian , Zhang Yao-Zhong
Published: December 2023

We review some aspects of the Racah algebra R(n), including the closure relations, pointing out their role in superintegrability, as well as in the description of the symmetry algebra for several models with coalgebra symmetry. The connection includes the generic model on the (n − 1) sphere. We discuss an algebraic scheme of constructing Hamiltonians, integrals of the motion and symmetry algebras. This scheme reduces to the Racah algebra R(n) and the model on the (n − 1) sphere only for the case of specific differential operator realizations. We review the method, which allows us to obtain the commutant defined in the enveloping algebra of 𝔰𝔩(n) in the classical setting. The related 𝒜3 polynomial algebra is presented for the case 𝔰𝔩(3). An explicit construction of the quantization of the scheme for 𝒜3 by symmetrization of the polynomial and the replacement of the Berezin bracket by commutator and symmetrization of the polynomial relations is presented. We obtain the additional quantum terms. These explicit relations are of interest not only for superintegrability, but also for other applications in mathematical physics.
Coherent states generated by means of supersymmetric quantum mechanics for tilted anisotropic Dirac materials
Authors: O-Campa Daniel , Díaz-Bautista Erik
Published: December 2023

In this paper, we consider the interaction of electrons in tilted anisotropic Dirac materials with external electric and magnetic fields with translational symmetry, for a specific non-null electric field amplitude that allows us to decouple the differential equation system arising in the eigenvalue problem. Then, the eigenstates and eigenvalues for the corresponding Hamiltonian operator can be obtained by means of supersymmetric quantum mechanics. In order to use a semi-classical approach to analyze this system, we find a family of coherent states. Finally, the properties of these states are analyzed through fidelity and the Wigner function.
On parametric generalizations of the Kardar-Parisi-Zhang equation and their integrability
Authors: Prykarpatski Anatolij K. , Bovdi Victor A. , Vovk Myroslava I. , Pukach Petro Ya.
Published: December 2023

There are analyzed two physically reasonable generalizations of the Kardar-Parisi-Zhang equation describing the spin glasses growth models and possessing important from physical point of view properties. The first one proved to be a completely integrable Hamiltonian dynamical system with an infinite hierarchy of commuting to each other conservation laws, and the second one proved to be linearized modulo some nonlinear constraints, imposed on its solutions.
Conserved Restricted Solid-on-Solid Model
Authors: Savu Anamaria
Published: December 2023

We introduce and study a model for the movement of surfaces, namely the conserved, restricted solid-on-solid model. The surface configurations are restricted such that the difference between the heights at adjacent sites is no more than one. In addition, the total number of particles is preserved by the dynamics of the model. Mean-field approximations are used to approximate the one-site probability function of the model in both time-independent and time-dependent regimes. In the time-dependent regime, we found that for the height at one site, the average evolves like t
1/6 and squared fluctuations like t
1/3.
Special matrices used in the analysis of the Boolean quadratic forms
Authors: Hęćka Patrycja
Published: December 2023

In this article we deal with the special matrices used in the analysis of the Boolean quadratic forms. We define basic notation and terminology, like Boolean independence or Boolean cumulants, which are useful to formulate the matrix problem. We check for which matrices appropriately constructed quadratic forms are Boolean independent. We show that the size of the matrix matters in this problem. We present the methods useful to find matrices for which corresponding Boolean quadratic forms are or are not Boolean independent.
Jordan blocks and the Bethe ansatz: The eclectic spin chain as a limit
Authors: Nieto García Juan Miguel
Published: December 2023

We present a procedure to extract generalised eigenvectors of a non-diagonalisable matrix by considering a diagonalisable perturbation and computing the non-diagonalisable limit of its eigenvectors. As an example, we show how to obtain a subset of the spectrum of the eclectic spin chain from the spectrum of a twisted 𝔰𝔲(3) spin chain.
Magnetic properties and entanglement of the octanuclear nickel phosphonate-based cage
Authors: Babujyan H , Burdik Č , Amatuni G , Ananikyan L , Ananikian N
Published: December 2023

The main subject considered in this paper is the quantum magnetic properties and entanglement of an octanuclear nickel phosphonate-based cage. We measured the temperature-dependent magnetic susceptibility of this cage, which indicates the coexistence of both antiferromagnetic and ferromagnetic interactions between the magnetic centers, Ni ions with spin 1. This observation prompted us to theoretically investigate the magnetic properties of such compounds. Our theoretical calculations were compared with the experimental results for magnetic susceptibility. Additionally, we explored the magnetization plateaus and magnetic susceptibility from an external magnetic field at low temperatures. We determined the thermal entanglement (negativity) and the logarithmic negativity for the octanuclear nickel phosphonate-based cage. The observed correlation between magnetization plateau jumps and magnetic susceptibility peaks in relation to the external magnetic field suggests the need for further experimental measurements.
Complex Structures, T-duality and Worldsheet Instantons in Born Sigma Models
Authors: Kimura Tetsuji , Sasaki Shin , Shiozawa Kenta
Published: December 2023

We study generalized (doubled) structures in 2D-dimensional Born geometries in which T-duality symmetry is manifestly realized. We show that spacetime structures of Kähler, hyperkähler, bi-hermitian and bi-hypercomplex manifolds are implemented in Born geometries as generalized (doubled) structures. We find that the Born structures and the generalized Kähler (hyperkähler) structures appear as subalgebras of bi-quaternions ℂ × ℍ and split-tetra-quaternions ℍ × Spℍ. We investigate the nature of T-duality for the worldsheet instantons in Born sigma models. This manuscript is based on the original paper [1].
Generalized integrals and point interactions
Authors: Dereziński Jan , Gaß Christian , Ruba Błażej
Published: December 2023

First we recall a method of computing scalar products of eigenfunctions of a Sturm-Liouville operator. This method is then applied to Macdonald and Gegenbauer functions, which are eigenfunctions of the Bessel, resp. Gegenbauer operators. The computed scalar products are well defined only for a limited range of parameters. To extend the obtained formulas to a much larger range of parameters, we introduce the concept of a generalized integral. The (standard as well as generalized) integrals of Macdonald and Gegenbauer functions have important applications to operator theory. Macdonald functions can be used to express the integral kernels of the resolvent (Green functions) of the Laplacian on the Euclidean space in any dimension. Similarly, Gegenbauer functions appear in Green functions of the Laplacian on the sphere and the hyperbolic space. In dimensions 1,2,3 one can perturb these Laplacians with a point potential, obtaining a well defined self-adjoint operator. Standard integrals of Macdonald and Gegenbauer functions appear in the formulas for the corresponding Green functions. In higher dimensions the Laplacian perturbed by point potentials does not exist. However, the corresponding Green function can be generalized to any dimension by using generalized integrals.
Structural Design and Obstacle-Crossing Performance Analysis of a Compact Anti-Terrorist Robot
Authors: Chu Yutao , Zhang Zhian
Published: December 2023

In consideration of the risks faced by soldiers during anti-terrorism tasks, a compact anti-terrorism robot has been designed. This robot effectively combines detection and attack capabilities while maintaining a weight limit of 12kg. This paper provides a detailed description of the robot’s structural design and its obstacle-crossing action plan for climbing steps. From a kinematic perspective, it analyzes the relationship between the tracked robot’s structural dimensions and the height of steps. By utilizing Matlab, relationship diagrams are generated to determine the maximum step-climbing height by the tracked robot. Furthermore, Recurdyn software is employed to simulate obstacle crossings performed by this crawler robot in order to validate theoretical analysis through obtaining torque curves during movement. The results demonstrate that both structural dimensions and center-of-mass positioning significantly impact obstacle-crossing performance.
Design and Analysis of Automatic Heat Sealing Production Line for a Top Cover
Authors: Yang Fan , Chen Dongxing , Chen Jiaxiang , Nie Xiangyang
Published: December 2023

To complete the automatic heat sealing and inspection of a battery top cover, a new automatic heat sealing production line is designed in this paper. The production line is used to seal the upper and lower plates of the top cover and to test the related functions. The main purpose of the research is to improve the automation of the sealing and testing for this product. According to the working conditions and requirements of the company, the structure of the entire automatic heat sealing production line was designed through SolidWorks, and the operating principle of the key components were analysed. ANSYS was applied to carry out static analysis and thermal stress coupling analysis on the key components of the gripping and translating mechanism in the device to verify the rationality of its structural design.