bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Verification of Rotating Avoiding Type Locking-Releasing Mechanism
Authors: Liu Wei , Zhou Yiming , Wang Chunjie , Ding Jianzhong 
Published: December 2023

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.