bluuebunny/crossref_metadata_2025 huggingface dataset:
Ni Single Atoms/Fe3N Nanoparticles Supported by N‐Doped Carbon Hollow Nanododecahedras with Nanotubes on the Surface for Efficient Electro‐Reduction of CO2 to CO
Authors: Zhan Qi‐Ni , Zhang Hong , Huang Chen‐Jin , Xu Hui‐Min , Shuai Ting‐Yu , Zhu Hong‐Rui , Li Gao‐Ren
Published: January 2025

The transition metal single atoms (SAs)‐based catalysts with M‐NX coordination environment have shown excellent performance in electrocatalytic reduction of CO2, and they have received extensive attention in recent years. However, the presence of SAs makes it very difficult to efficiently improve the coordination environment. In this paper, a method of direct high‐temperature pyrolysis carbonization of ZIF‐8 adsorbed with Ni2+ and Fe2+ ions is reported for the synthesis of Ni SAs and Fe3N nanoparticles (NPs) supported by the N‐doped carbon (NC) hollow nanododecahedras (HNDs) with nanotubes (NTs) on the surface (Ni SAs/Fe3N NPs@NC‐HNDs‐NTs). The synergistic effect between Ni SAs and Fe3N NPs can obviously improve the proton‐coupled electron transfer step of CO2 reduction reaction and promotes the process of electrocatalytic reduction of CO2 to CO. The fabricated Ni SAs/Fe3N NPs@NC‐HNDs‐NTs exhibits a high CO selectivity of up to 94% in the potential range of −0.41–−0.81 V versus Reversible Hydrogen Electrode (vs RHE), and an optimal CO Faraday efficiency (FECO) of ≈97.31% at −0.68 V (vs RHE) in the reduction reaction CO2 to CO. In the theoretical calculation results, due to the non‐bonding synergy effect between Ni SAs and Fe3N NPs, the free energy of *COOH formation is greatly reduced and the adsorption of *CO is obviously improved, which will efficiently promote the conversion between the intermediates in the reaction step and accelerate electro‐reduction process of CO2. This work will provide a new method for constructing a mutually optimized coordination environment between Ni SAs and Fe3N NPs to improve the catalytic performance of CO2RR by synergistic complementarity between the dual active sites.
Water‐Deficient Interface Induced via Hydrated Eutectic Electrolyte with Restrictive Water to Achieve High‐Performance Aqueous Zinc Metal Batteries
Authors: Luo Ping , Wang Yuyuan , Zhang Wenwei , Huang Zhen , Chao Feiyang , Yuan Yuxin , Wang Yipeng , He Yufan , Yu Gongtao , Zhu Dongyao , Wang Zhaoyang , Tang Han , An Qinyou
Published: January 2025

The development of aqueous zinc metal batteries (AZMBs) is hampered by dendrites and side reactions induced by reactive H2O. In this study, a hydrated eutectic electrolyte with restrictive water consisting of zinc trifluoromethanesulfonate (Zn(OTf)2), 1,3‐propanediol (PDO), and water is developed to improve the stability of the anode/electrolyte interface in AZMBs via the formation of a water‐deficient interface. Additionally, PDO participates in the Zn2+ solvation structure and inhibits the movement of water molecules. PDO also preferentially adsorbs along the Zn (100) plane, thereby inducing the formation of the organic/inorganic SEI layer that enables the cycle life of a Zn//Zn symmetric cell to reach 3000 h at 1 mA cm−2 and 1 mAh cm−2. Further, interfacial modulation by the eutectic electrolyte improves the cycling stability of Zn//V2O5 and Zn//VO2 cells. Particularly, the specific capacity of a Zn//V2O5 cell with the eutectic electrolyte is 1.7 times that of a cell with the 2M Zn(OTf)2 electrolyte, with a capacity retention of 93% after 100 cycles at 0.5 A g−1. This study provides a new perspective on the electrolyte modification strategies for AZMBs, highlighting the potential of PDO‐8 electrolyte in developing aqueous energy storage devices with excellent cycling stability.
Effects of CuO nanoparticles on the physical and functional properties of biodegradable polymer‐based composites for biomedical and flexible packaging applications
Authors: Ragab H. M. , Diab N. S. , Aziz Rosilah Ab , Elneim Eshraga Abdallah Ali , Alghamdi Azzah M. , Tarabiah A. E. , Farea M. O.
Published: January 2025

This study explores the development of biodegradable nanocomposites using HPMC, PVA, and CMC, incorporated with copper oxide (CuO) nanoparticles, aiming to create sustainable packaging materials with improved antimicrobial properties. CuO nanoparticles were synthesized via a chemical precipitation method and integrated into the polymer blend through a casting technique. X‐ray diffraction (XRD) analysis confirmed the monoclinic crystal structure of CuO and the semi‐crystalline nature of the polymer blends. Fourier transform infrared (FTIR) spectroscopy revealed interactions between the host polymers and CuO nanoparticles. Optical tests showed that the addition of CuO nanoparticles reduced both the direct (Egd) and indirect (Egi) energy gaps. Electrical conductivity measurements indicated an increase in conductivity with higher CuO concentrations, attributed to enhanced charge carrier mobility and reduced crystallinity. Contact angle measurements indicated decreased hydrophobicity as CuO concentration increased, suggesting improved biocompatibility. Cell viability tests on HFB4 fibroblast cells demonstrated a significant increase in cell viability, with the highest value observed at 5.0 wt% CuO, indicating favorable biocompatibility for biomedical applications. Moreover, antimicrobial testing revealed significant inhibition against both Gram‐positive and Gram‐negative bacteria, with a stronger effect on Gram‐positive strains. These results highlight the potential of CuO nanoparticles in enhancing the properties of HPMC/PVA/CMC blends, offering promising applications for biodegradable packaging materials, electronic devices, and biomedical fields.

Highlights

Biodegradable HPMC/PVA/CMC films enhanced using CuO for eco‐friendly use.

CuO nanoparticles improved optical and electrical properties by reducing band gaps.

Enhanced antimicrobial activity observed against Gram‐positive bacteria.

Biocompatibility confirmed, with 5.0 wt% CuO showing the best performance.

Developed films are promising for biomedical uses and sustainable packaging.
Mandibular fibrosarcoma leading to neurological signs in a pet rabbit (Oryctolagus cuniculus forma domestica)
Authors: Döbelt Franziska , Groeneveld Gabriele
Published: January 2025

This case report describes the case of a 1.5‐year‐old, neutered, female rabbit, which was presented with gastrointestinal and neurological signs in association with a palpable mandibular mass on the right side of the head. A computed tomography scan showed a mass with heterogeneous density. Furthermore, there was an osteolysis of the mandibular ramus and temporal bone with suspected intracranial and tympanic bulla involvement. The right temporomandibular joint was subluxated. Cytological evaluation of a fine‐needle aspirate sample revealed a mesenchymal neoplasm. The rabbit's neurological signs rapidly deteriorated to vestibular ataxia with a head tilt to the right side, drift to the right and an inability to eat. Finally, the patient was euthanased. The final diagnosis of a malignant mesenchymal neoplasm, most likely a fibrosarcoma was reached by histopathology. This is the first report of neurological signs in a pet rabbit associated with mandibular fibrosarcoma during the course of the disease.
Effects of naming heatwaves on risk perception and protective behaviour
Authors: Sprengholz Philipp , Bruckmann Robert , Wolstein Jörg
Published: January 2025

The frequency, intensity and duration of heatwaves are growing across the globe, which calls for measures to increase public awareness and protective behaviour. We investigated whether naming heatwaves could promote heat‐related risk perception and actions. In a preregistered experiment, older adults from Germany (N = 272) read the announcement of either a nameless or named heatwave. Contrary to our expectations, the named heatwave resulted in lower risk perception and decreased intention to cool down one’s home in preparation. In conclusion, the findings indicated no immediate benefits of naming heatwaves.
Adding Semi Elemental Enteral Nutrition Formula Improves Tolerance Without Compromising Bowel Preparation Quality for Colonoscopy: A Non‐Inferiority Randomized Controlled Trial
Authors: Mohammad Azmi Nabil , Nadzira Anith , Abdul Rahman Nur Afdzillah , Mohd Azman Zairul Azwan , Chandrakanthan Soma Balaganapati , Dualim Diana Melissa , Sagap Ismail
Published: January 2025

Background

Aims conventional bowel preparation restricts dietary intake up to 72 h prior to colonoscopy. Bowel preparation process is often perceived as unpleasant leading to poor compliance and subsequent poor bowel preparation. The aim of this trial is to compare the efficacy of low‐residue semi‐elemental enteral formula (LREF) incorporated diet versus the standard diet in polyethylene glycol (PEG)‐based bowel preparation in the aim of creating a more tolerable bowel preparation regimen without compromising bowel cleanliness.

Methods

This was a multicenter, prospective, single‐blinded, randomized controlled noninferiority trial. The noninferiority margin was set at 15%. One hundred sixty‐seven patients were recruited and randomized to either the LREF group or the standard diet (SD) group using a 3L PEG preparation regimen.

Results

The LREF group results in comparable satisfactory preparation rating to the standard diet group with a mean BPPS score of 6.87 (SD 1.59) versus 7.14 (SD 1.54) (95% CI[−0.86; 0.32] and p = 0.367). The mean difference (MD) of the BBPS total score between the two groups was −0.27 (95% CI [−0.764 and 0.224]). Equivalence were demonstrated using the two one‐sided test (alpha = 5%) with the lower t‐value of 2.682 (p = 0.0042) and the upper t‐value of −4.493 (p < 0.01). There was also no significant difference in PEG compliance, willingness to repeat the procedure and tolerance to the bowel preparation between the two groups.

Conclusion

The LREF incorporated diet is equivalent to regimen in achieving satisfactory bowel cleanliness in patients undergoing PEG‐based bowel preparation. We suggest that a LREF incorporated regimen for bowel preparation can be considered in patients who are unable to sustain prolonged fasting to improve the procedural experience.
ReProVide: Query Optimization and Near-Data Processing on Reconfigurable SoCs for Big Data Analysis
Authors: Hahn Tobias , Langohr Maximilian , Becher Andreas , Nair Lekshmi Beena Gopalakrishnan , Meyer-Wegener Klaus , Teich Jürgen , Wildermann Stefan
Published: January 2025

The available parallelism and heterogeneity of emerging computer systems must be exploited for being able to process the huge amounts of data produced every day. As a consequence, we observe an increasing research interest in accelerating database query processing on multi-cores and attached co-processors like Graphics Processing Units (GPUs) and Field-Programmable Gate Arrays (FPGAs). This chapter presents ReProVide, an approach combining near-data processing and FPGA-based acceleration. The System-on-Chip (SoC) architecture of ReProVide including a flexibly reconfigurable FPGA can load and execute hardware accelerators for various operators on relational and streaming data. Moreover, we present novel DBMS techniques for partitioning query-execution plans between a host and Reconfigurable data-Provider Units (RPUs) and for mapping operators onto RPUs by means of hardware reconfiguration.
The Dairy Industry as a Source of Conflict between Québec and the United States
Authors: Holland Kenneth , Holland Julie
Published: January 2025

This chapter describes one of the most significant current sources of conflict between Québec and the United States, viz., lack of full access by American producers of dairy products to the Québec market. Although the law that limits imports is federal, the influence of Québec’s dairy industry, the largest in Canada, in Ottawa means that the policy reflects the interests of La belle province. The American administration of Joe Biden has filed two challenges against Canada’s actions to protect the dairy industry under the dispute resolution provision of the Canada-United States-Mexico Agreement (CUSMA). The Québec government has two choices regarding how to manage this growing conflict with the United States. It can continue its current approach of pressuring Ottawa to continue to deny access to American exporters of milk, cheese, yogurt, butter and ice cream, and to maintain supply management, or it can follow the example of New Zealand and choose pursuit of reciprocal trade arrangements under which Québec dairy producers and manufacturers gain access to the large American market in exchange for opening its market to American products. The latter option fits well with Québec’s policy of growing its exports to the United States and reducing its reliance on trade with English Canada but would cause a major restructuring of the province’s dairy industry.
Public Participation in the Management of Risk from Industrial Facilities
Authors: Webler Thomas
Published: January 2025

Industrial facilities have at times made many costly mistakes when interfacing with local communities. Risk characterizations comprising risk experts’ probabilistic risk assessments may be technically competent, but not wholly objective, nor do they capture all dimensions of risk that matter to members of the public. When confronting publics and stakeholders who are concerned about a risk, a competent probabilistic risk assessment may not be sufficient to allay fears and concerns. This chapter explains why and describes best practices for public and stakeholder engagement. It argues these should guide practice when industrial facilities managers interact with the public. It also highlights customary simplifications and misunderstandings that can worsen conflict. Over the past thirty years social scientists have studied and learned about how to effectively engage publics and stakeholders in risk decision making. Management would be wise to invest in the capacity to interpret this literature and employ its recommended solutions.
Experimental Study of the Load-Deformation Characteristics of Bolted Joints Under Transverse Alternating Loads
Authors: Zhang Qiang , Wang Bing-Nan , Zhang Xiao-Chen , Xu Bo , Li Yan , Xiao Qing-Biao , Dong Xing-Hua
Published: January 2025

It is of great significance to study the energy dissipation characteristics of bolted joints under transverse alternating loads especially for analyzing the dynamic response of transmission tower structures and enhancing its safety and reliability. In this paper, a combination of finite element simulation and experiments is used. Firstly, the finite element model of bolted joint of transmission tower is established, and the load–displacement curve is obtained by applying transverse alternating load on the end face of angle steel. Afterwards, a fatigue test machine is used to apply cyclic load to six different joints. In this way, the simulation results are verified and the influence of factors such as bolt looseness, number of nuts, presence or absence of washers, loading frequency, and number of bolts on joint energy consumption is given. The results show that the finite element model established in this paper can effectively simulate the loosening and failure of bolts. The energy dissipation characteristics are mainly related to the structural methods of the joints. In the construction of bolted joints effective bolt anti-loosening measures should be taken to improve the energy consumption characteristics of joints.
Construction of Bearing Performance Degradation Indicators for Adaptive Improvement of Principal Component Analysis
Authors: Chen Chunjun , Huang Linshuying
Published: January 2025

Rolling bearing health assessment relies on the constructed degradation indicators, In order to improve the monotonicity and trend of the indicators, a fusion indicator construction method considering feature burr removal is proposed. For the feature burrs appearing in the rolling bearing degradation performance characterization features that deviate from the expected degradation trend, a criterion-based adaptive burr removal strategy is used to detect and remove the burrs existing in the characterization features to improve the performance of the degradation indicators; then, principal component analysis (PCA) is used to fuse six kinds of time domain features, to remove the redundant information in the original state feature space, to maintain the global structure of the bearing degradation data, and further use the Exponentially Weighted Moving Average (EWMA) algorithm to smooth the fusion indicators to obtain high-quality degradation indicators. The experimental results verify the superiority of the proposed method in terms of monotonicity and trend.
Research on the Influence of Thermostatic Block on the Temperature Uniformity of Thermocouple Calibration Furnaces
Authors: Cheng Lei , Ni Bo , Zao Wentao , Nie Hongqing , Weng Jun
Published: January 2025

The temperature uniformity of thermocouple calibration furnace plays an important role in the calibration of base metal thermocouple and is an important parameter to evaluate the accuracy of thermocouple calibration. In JJF 1637-2017 “Calibration Specification for Base Metal Thermocouples”, it is proposed to use thermostatic block to improve the uniformity of thermocouple calibration furnace. Many scholars verify the feasibility of using thermostatic block through experimental methods, but experimental research requires many built-in standard thermocouples which are not completely consistent with the actual working state and the temperature data can be obtained is limited. In order to further explore the heat transfer mechanism of improving temperature uniformity by using thermostatic block, the temperature distribution of temperature field in furnace is calculated by theoretical analysis and numerical simulation. The calculation results show that the alloy thermostatic block plays a good role in optimizing the temperature field because of its good thermal conductivity. Compared with not placing the thermostatic block, the maximum temperature difference in the axial direction is reduced by 2 times and the maximum temperature difference in the radial direction is reduced by 1 times, which is an important means to improve the temperature uniformity.
Chatter Prediction for In-process Machining of a Thin-Walled Workpiece with Variable Curvature Considering Deformation
Authors: Fan Yuqi , Yuan Xing , Luo Nianmeng
Published: January 2025

In aerospace applications, avoiding chatter is an efficient way to improve the machining quality of weakly stiff parts. However, it is not easy to establish an accurate chatter stability model for variable curvature thin-walled workpieces under time-varying machining conditions due to their complex dynamic characteristics. For this issue, the paper proposed a chatter prediction model to effectively predict the chatter of variable curvature thin-walled workpieces considering material removal, cutter position, deformation along the cutter radius and axis, and other time-varying machining characteristics. Finite element simulation and milling tests to analyse the correctness in the proposed model. The proposed method contributed to chatter-free machining parameter planning to ensure machining stability.
Strength Analysis of Transmission Shaft Spline Pair Under Wide-Area Load
Authors: Bian Jixuan , Wang Cheng , Sun Xueyan , Wang Guodong , Hou Wei , Zhang Peng
Published: January 2025

In this paper, the left, middle and right spline pair of transmission shaft is taken as the research object, and the geometric model after parametric modeling is imported into finite element software to obtain the distribution law of equivalent stress, bending stress, contact stress and relative slip of involute spline pair. The effects of contact length, number of teeth, modulus and friction factors on involute spline are studied, to provide reference for the design and engineering application of involute spline pair of transmission shaft for power split transmission.
Simulation Study of Dynamic Behavior of Cage in High-Speed Train with Wheelset Bearing Outer Raceway Flaw
Authors: Liao Xiaokang , He Liu
Published: January 2025

A wheelset bearing is a critical part of high-speed train bogies; its running status directly affects the safety and stability of the trains. A wheelset bearing vehicle track dynamic analysis model with a flaw in the wheelset bearing outer raceway is established, and the dynamic response of the wheelset bearing cage is calculated through simulation analysis software. The calculation results indicate that when the wheelset bearing outer raceway is defective, the change amplitude of wheelset bearing roller angular velocity increases, and the wheelset bearing roller angular velocity also has periodic mutation. As the flaw width of wheelset bearing outer raceway expands, the contact behavior between the wheelset bearing roller and the wheelset bearing outer raceway intensifies, and the impact of the wheelset bearing roller on the cage increases, and the relative deviation of the position of the center of mass gradually increases, causing the decrease of the stability of the wheelset bearing cage.
Meshing Theory and Modeling Simulation of Miniature Archimedean Cone Worm Gear Pair
Authors: Zhang Wang , Fan Yuanxun , Ma Haocong , Xu Zhiwei
Published: January 2025

Conical worm gearing is a new type of worm gearing composed of a conical worm and a conical worm wheel, which differs from ordinary cylindrical worm gearing in that the working helical surface of the worm in the conical worm gearing pair is offset on the side of the worm wheel, and the shape of the worm and the worm wheel are conical. Taking the Archimedean cone-worm transmission as the research object, using the principle of gear meshing, the tooth equations of the cone worm and cone worm gear are deduced, combining with MATLAB, Solidworks and other computer-aided software for solid modeling of the cone-worm transmission, to obtain the three-dimensional model and the model is assembled and then analyzed by the finite element software to find out that the contact and force conditions of the cone-worm transmission meet the actual requirements, which is a good idea for the design and reliability of miniature transmission mechanism. It provides theoretical support for the design and reliability of micro transmission mechanism.
Model-Based Control of Lane-Keeping Assist System Using GA-BP Neural Network
Authors: Tian Chi
Published: January 2025

Aiming at the lateral safety problem when driving a car, it is proposed to introduce the BP neural network into the Lane Keeping Assistance System (LKAS) and combine it with the genetic algorithm to create a new BP neural network based lane keeping assistance system. In this article, firstly, the vehicle dynamics was modeled by vehicle dynamics, and then on this basis, the genetic algorithm was used to optimize the car. Finally, it is verified by simulation that compared with the traditional BP neural network, the BP system optimized by genetic algorithm has the smaller overshoot, faster responsiveness, and better guarantee the safety of driving.
Mechanical Design of an Exoskeletal Master Device for Upper-Limb Rehabilitation Robot
Authors: Liu Chongshuai , Xia Kang , Zhou Jianfang , Sun Han , Wang Yimin
Published: January 2025

Upper limb rehabilitation exoskeleton can be a good substitute for professional therapists in rehabilitation training for stroke patients, but few devices can accurately obtain the upper limb rehabilitation movements of therapists or patients on the healthy side to guide the rehabilitation exoskeleton in passive rehabilitation of patients. In this paper, a 10-DOF exoskeletal master device is proposed, which includes all the degrees of freedom of upper limb, and is improved from two aspects of kinematic analysis and structural design. By studying the motion of the whole upper limb, especially the shoulder joint, the complete upper limb motion chain is proposed in this paper, and the feasibility is verified by kinematics analysis. Then the structure design is carried out and introduced in detail. Finally, genetic algorithm was used to optimize the structural parameters of pHRI, which provided a reference for Physical human–robot-interface (pHRI) transplantation to different exoskeleton devices.
Development and Optimization of a WebGL-Based Mechanical Model Simulation Platform
Authors: Wang Xintong , Tian Hao , Fang Jingzhe , Zhang Hualiang , Zhang Tao
Published: January 2025

The need for mechanical model simulation platforms is growing as a result of the ongoing advancements in digital technology and the mechanical manufacturing sector. The application scope and efficacy of simulation platforms are severely limited by the issue of sluggish rendering performance, which frequently arises when obtaining high-quality rendering. When drawing high demand mechanical models, a lot of processing power is frequently needed, which makes real-time rendering speed unsatisfactory for practical purposes. In order to achieve real-time rendering and simulation of 3D robots, this experiment built and implemented a WebGL-based 3D simulation platform. Additionally, the simulation platform can be optimized by increasing frame rate and rendering speed without sacrificing rendering effect by building a mixed bounding box.
Scheme Design and Challenges of DNA Sequencing Terminal Equipment Based on Solid-State Nanopore Sequencing
Authors: Zhao Yuanzhe , Zhang Jie , Sun Zepeng , Cao Zheqi , Xu Liqun , Li Jian
Published: January 2025

Nanopore sequencing has become the primary technology for modern DNA sequencing. Solid nanopores are favored for their cost-effectiveness, stability, and scalability, particularly for portable applications. This paper presents a new design for a portable solid-state nanopore sequencing device based on the Linux platform. It employs a cutting-edge biological sequencing chip with a nanopore channel to capture through-hole data. Electrical signals from the chip are processed to create DNA sequence data files. The Linux-based Raspbian OS serves as the control terminal, facilitating seamless communication between components. Data is then transmitted to a cloud platform via a 5G unit for further analysis. This study integrates software and hardware for instrument validation.
Key Technology and Equipment for Splitting and Grouting of Complex Geotechnical Bodies
Authors: Hu Yaoyao , Cai Heng , Zhang Ning , Li Mengtian , Zhang Shengtao , Wang Hanpeng
Published: January 2025

Due to the hidden nature and complexity of the underground engineering rock body, the actual grouting process is mostly a black box operation, which makes it difficult to observe and control the splitting direction of the slurry vein, and the slurry vein splitting is difficult to be expanded according to the expected direction and length, therefore, it is especially important to clarify the splitting law, start splitting and diffusion law of the slurry vein during the grouting process to study the directional control mechanism of the splitting grouting slurry vein. Therefore, an array type 27-channel multivariate data monitoring true triaxial split grouting simulation tester is developed independently, which includes four parts: true triaxial grouting test platform, triaxial loading unit, digital grouting unit and information acquisition unit, and the system can be used to carry out split grouting simulation tests under different geostress conditions, and to study the split diffusion law of the grouting veins in the complex soil body.
Design and Gait Control of a Quadruped Robot with a Waist Joint
Authors: Li Fei , Zhang Wenliang , Hong Gang
Published: January 2025

Quadruped robots have advantages in manufacturing cost, operation stability, and difficulty, suitable for substation inspection and other operational scenarios. Based on SolidWorks software, a Quadruped robot with four single-joint legs is designed based on the prototype of the dog animal in nature. The robot has four semi-circular legs and a waist joint and has five degrees of freedom. Based on the designed quadruped robot model, the motion of the quadruped robot with the waist joint is simulated and analyzed in Adams. Finally, experiments are carried out to test the effect of the waist joint of the quadruped robot. The results show that the waist joint helps control the direction of the robot motion and improves the stability of the robot motion.
Proposal and Simulation of a Wheeled Omnidirectional Wall-Climbing Robot
Authors: Duan Zhenhua , Deng Chenggang , Yu Chenhao
Published: January 2025

Omnidirectional movement of climbing robots can boost the efficiency of wall operation, reduce the requirement of effective space for steering action, and mitigate the occurrence of instability. In this paper, a new structure of an omnidirectional wall-climbing robot is proposed, which is equipped with an independent omnidirectional wheel mechanism and a two-axis output reduction motor, so that the crawling drive is more reliable and stable. Secondly, the robot is subject to mechanical and magnetic performance analyses to determine the parameters of the combined adhesion of magnetic wheels and block magnets. Finally, based on Adams software, the robot dynamics simulation with examples of vertical and 45° upward crawling are carried out. The results demonstrate that the robot can realize omnidirectional crawling on the wall, which verifies the rationality of the structure scheme and operation principles, providing theoretical references for subsequent prototype development.
Simulation Design of Non-lethal Hollow Spherical Kinetic Energy Projectile Based on ANSYS LS-DYNA
Authors: Wang Song
Published: January 2025

In order to promote the intrinsically safe design of non-lethal kinetic energy projectile, an optimization design study was carried out for 38 mm hollow spherical non-lethal kinetic energy projectile. The impact rigid wall experiment of solid spherical projectile was used to complete the indirect verification of the projectile material parameters. The projectile wall thickness of 5, 7, 9, 11 and 13 mm was set respectively. Based on ANSYS LS-DYNA software, the changes of velocity, kinetic energy, radius, specific kinetic energy, VCmax value, energy transfer ratio and other data under five kinds of wall thickness were analyzed. The results showed that when the thickness, density, and impact velocity were separately set as 11 mm, 0.998 kg/m3, and 100 m/s, the wounding power of the projectile did not exceed the threshold of specific kinetic energy and VCmax value. Which provided the parameter support for the hollow spherical non-lethal kinetic energy projectile sample processing.
Research on the Structural Safety Performance of Front Fan-Shaped Energy-Saving Duct
Authors: Tang Xu , Zhao Chenyang , Wang Xing , Xia Haochao , Zhou Bin
Published: January 2025

Whether the structural design of an energy saving duct is reasonable is crucial to its own safety and that of the stern. Taking the front-mounted scalloped duct of a certain type of bulk carrier as the research object, load calculation and reasonable load combination design are carried out according to its actual working conditions, and the safety performance of the structure is evaluated through strength analysis, modal analysis and fatigue analysis. The results show that the structural design of the sector duct is reasonable and meets the requirements of strength and fatigue, and can avoid the occurrence of resonance phenomena, and that the bumping load on the duct from wave loads in rough sea conditions is an important factor to be considered in the structural design of the duct.
Design of Automatic Recycling and Conveying System for Unpacking Tobacco Cartons in Tobacco Shreds Production Line
Authors: Yu Zhipeng , Mao Lihui , Zhu Bin , Qian Jie , Ying Jianming , Shen Liwei , Zhang Yuhai , Wang Junhui
Published: January 2025

In order to solve the problems of long manual intervention time and low automation level of the unpacking process, a set of carton automatic recovery conveyor system is designed for the carton recovery section of the unpacking process. The system mainly consists of dismantling conveyor, pallet conveyor, carton straightening device, interface conveyor, IGV trolley interface program and safety interlocking system, etc. Through this set of devices, the unpacked cartons can be automatically recovered and conveyed. Test data show that this system can reduce the manual intervention time of the unpacking process from the previous average of 73.2 min per production line to 6.1 min. The design of this system greatly reduces the consumption of human resources, improves the level of production intelligence, and effectively meets the needs of enterprises to implement intelligent manufacturing and promote the construction of intelligent factories.
Multi-stage Optimization Design of Composite Box Structure
Authors: Li Wenpeng , Li Xiang , Qin Fenqi , Guo Zhounan
Published: January 2025

Composite materials have the advantages of high specific strength and high specific modulus, and are widely used in aerospace, automobiles, ships and other fields. In order to carry out the lightweight design of box structure, this paper proposes a topology-size joint optimization strategy for composite structure optimization on the basis of research and analysis of topology optimization and composite material optimization related technologies, first through topology optimization to obtain the layout form of the structure, and then establish the structural model of the composite material on this basis, and optimize the size of this to obtain the optimized composite structure.
Fatigue Analysis and Optimization Design of Integrated Functional Coffee Brewing Device
Authors: Liu Guangyu
Published: January 2025

In recent years, with the continuous improvement of people’s quality of life, the demand for diversified beverages has been increasing, and the coffee machine market has been growing rapidly. Based on the above background and combined with the actual living conditions, a functionally integrated coffee brewing device is proposed. In this device, the integrated design is used in multiple structures to reduce the product volume, making it portable and practical, and at the same time, it can achieve full automation from cup fetching to coffee brewing process. In this paper, the pouring structure of the coffee brewing device is analyzed using ANSYS software. Taking into account the different weights of different water cups and the change of ambient temperature, the functional relationship between force load, ambient temperature, and stress deformation is established, and a high-precision response surface is constructed combined with the Kriging model to obtain the most suitable working conditions for the coffee brewing device. At the same time, the fatigue analysis of the cup bearing part in the device is carried out, and the fatigue life cloud map is obtained, which verifies the feasibility of the pouring structure.
Mechanical Design of a Fully Automatic Material Sorting Device
Authors: Wei Yuchen
Published: January 2025

In recent years, with the development of society, market competition has become increasingly fierce. Business in industries such as e-commerce and express delivery has exploded. The development of the logistics industry is also accelerating, and the large-scale manual assembly line work no longer meets our current needs. The demand for automation has become higher and higher. Therefore, it is especially important to design fully automatic material sorting devices according to different needs, in order to satisfy our requirements.
QFD Based Conceptual Design of Civil Aircraft Landing Gear
Authors: Zheng Bosi , Yin Huiting
Published: January 2025

Landing gear system plays an important role in the process of takeoff and landing, and it’s a critical part to ensure flight operation safety, thus the landing gear design occupies a crucial position in aircraft design process. The conceptual design of landing gear is the first step of whole design process, which largely determines the final design results. The application of QFD (Quality Function Deployment) method in landing gear system can build a conversion model from landing gear system requirements to technical characteristics, parts and manufacturing process. While the application of rough number can make the conversion of requirements more objective and accurate. Compared with detailed design, the conceptual design method of QFD can realize overall planning and multi-dimensional optimization. In the later design stage, according to different design requirements or parameter constraints, the optimization scheme can be obtained faster by referring to the QFD model.
Topology Optimization Design of Circular Saw Blade for Shrub Harvester
Authors: Zhang Litong , Zhang Lifu , Wang Baichao , Yuan Ziyi
Published: January 2025

In order to reduce the stress concentration of the circular saw blade of the shrub harvester, improve the heat dissipation effect of the circular saw blade, reduce the deformation caused by thermal expansion, and improve the service life of the circular saw blade, the paper adopts the variable density method, and uses the method of finite element simulation to optimize the topological design of the circular saw blade of the shrub harvester. Fixed constraints and dynamic loads are added in the optimization to simulate the actual working conditions, and finally the pseudo-density cloud image of the circular saw blade is obtained, and according to the obtained pseudo-density cloud, the circular saw blade is further structurally designed. The study shows that the optimized structure can improve the problem of stress concentration of circular saw blades, which plays a role in improving the life of circular saw blades.
Study of Mechanical Properties of Waste ABS and PBT Blends
Authors: Wu Haihua , Liu Yuchen , Zhang Hongyu , Zhang Bingtao , Li Yingchun
Published: January 2025

The mechanical properties of waste ABS (Rabs)/PBT blends were studied. rABS/PBT and rABS/PBT/MBS blends were prepared by twin-screw extrusion granulation. The effects of different contents of MBS on the mechanical properties of blends were investigated. The results showed that the notch impact strength and toughness of ABS decreased significantly after aging, and the IR test showed that carboxyl groups and other active groups were produced. The mechanical properties are best when rABS/PBT/MBS = 50/50/8. With the increase of MBS content, the impact property of rABS/PBT blends gradually improved, the tensile strength decreased, the elongation at break increased, and the bending strength decreased not significantly.
Evaluation of Measurement Uncertainty for Impact Damage of Metallic Materials
Authors: Zhang Yao
Published: January 2025

Metal materials are widely used in aviation, aerospace, and other fields. At present, a large part of the materials for military and civilian equipment are metal materials. The mechanical properties of metal materials can be tested to understood as the characteristics of materials more comprehensively. One of the common forms of damage to metallic materials is impact damage from low-velocity impacts. Evaluation of the impact properties of materials using a drop hammer impact tester can objectively reflect the reliability of the permissible values of the impact properties of metallic materials, which is of great significance for the design of future aircraft structures. This paper takes the mechanical properties of aluminum–lithium alloy test piece impact test as an example, according to the source of uncertainty in the test results, analyses the reasons for the introduction of uncertainty components and mathematical model, through the calculation of the synthetic uncertainty of each component to finally obtain the extended uncertainty of the impact performance test of the material, which provides a basis for the study of the performance of the aircraft materials and structural design.
Topology Optimization of Beam Structures for 2D Problems
Authors: Nie Qianyue , Nie Yulin , Nie Zhifeng
Published: January 2025

Topology optimization of straight beam structures is carried out, and the effects of constraints, loads, mesh density and volume fraction on topology optimization results are studied. It is observed that topology optimization results are sensitive to constraints, load conditions, and mesh density. Low volume fraction can produce the topological results of the truss structures.
Numerical Simulation of Cycloidal Propeller Performance Based on CFD
Authors: Li Qingyang , Hu Yi , Wang Fan , Cao Xudong
Published: January 2025

Based on the analysis of the working principle of cycloidal propeller, this paper takes the scale model of a propeller as the research object, uses Solidworks modeling software, ICEM CFD mesh generation software and FLUENT solver to model and simulate the cycloidal propeller, studies the hydrodynamic performance of this type of cycloidal propeller, and obtains the numerical simulation results close to the experiment, thus verifying the feasibility of CFD method.
Kinematics Analysis and Optimization of Stepping Rotary Three-Dimensional Braiding Machine
Authors: Ji Cheng , Chen Yizhe , Wang Hui
Published: January 2025

Due to its excellent performance, three-dimensional composites are an ideal choice for components in the aerospace and automotive fields. However, the need for smooth operation and productivity of current braiding equipment limits the further application of braided composites. A virtual prototype model of a 3D braiding machine is built for a stepping rotary braiding machine. The kinematic simulation is carried out using ADAMS software to analyze the operational performance of the braiding machine. Through orthogonal experimental design, the effects of different factors such as spindle fit, the gap, yarn tension, and spindle material on the operation of the braiding machine were quantified, and the optimal combination of spindle design parameters was determined based on the experimental results. The Optimization result shows that the optimized spindle operation of the braiding machine has improved by 73% compared with that before the optimization, thus improving the reliability and efficiency of the braided component forming.
Effect of Paddle Mode on Flow Characteristics of a Continuous Stirred Tank Reactor (CSTR) Using CFD Simulations
Authors: Li Peng , Wu Xuan , Cheng Fuliang , Li Xueqin
Published: January 2025

The efficient stirring is crucial for mixing anaerobic bacteria and substrate in a Continuous Stirred Tank Reactor (CSTR). In this study, we propose a CFD model (Large Eddy Simulation (LES) model) to simulate the reactor’s flow characteristics. The standard turbine paddle modes of the CSTR with different shafts and paddle layers were investigated using XFLOW software. The simulation results reveal that the quantity of shafts and layers has significant influences on the flow characteristics of the reactor. Both single-shaft and double-shaft paddles can provide a complete circulation loop. The mixing performance of single-shaft paddles surpasses that of double-shaft paddles. Moreover, the double layer paddles have better mixing performance than the single layer paddles. Therefore, the most favorable paddle mode for a CSTR is the single shaft paddles with double layers.
Dynamic Simulation and Vibration Analysis of Rolling Bearing with Outer Ring Defects
Authors: Ni Wenjun , Zhang Chang
Published: January 2025

The statement is about establishing a finite element dynamic analysis model for a rolling bearing with a pit defect on its outer ring surface. Considering the influence factors such as load, speed, contact and friction, the dynamic response of the bearing outer ring surface with pit defects is studied. The shear stress when the ball enters and leave the defect and the vibration acceleration change between the rolling element and the outer ring are analyzed. Based on the shear stress distribution and vibration response information inside the structure, the fault mechanism of high-speed bearings can be further studied, which furnish a theoretical foundation for improving maintenance and management level for such equipment.
A Study of an Impedance-Controlled Force Feedback Grasping Technique
Authors: Su Xuesong , Wang Mei , Song Huifang , Liu Jia , Wang Kaiyue , Guo Hongyuan
Published: January 2025

This study delves into force feedback-based grasping techniques, utilizing impedance control methods to achieve precise control over both the end-effector pose and contact force of a robotic arm. A meticulous model of the AUBO i5 robotic arm is constructed in MATLAB/Simscape Multibody, and its performance is validated through simulation. Through the configuration of three distinct sets of impedance controller parameters, a thorough analysis is conducted to discern the impact of these parameters on the efficacy of the impedance controller, leading to the identification of the three primary parameters of the impedance controller. This research contributes to a more comprehensive understanding of the role of impedance control technology in grasping applications, offering valuable insights for the optimization of robotic arm systems.
Force Simulation and Analysis of Magnetic-Assisted Docking Poles
Authors: Su Xuesong , Wang Zhigang , Sun Yongqiang , Yang Xinxin , Wang Yifei , Guo Hongyuan
Published: January 2025

In the context of hoisting operations for oil field pumping equipment facilities, frequent hoisting tasks are associated with the installation of borehole equipment. The prevalent approach for precise positioning during hoisting operations involves manual assistance, a practice that not only violates safety regulations but also poses significant risks of mechanical injuries. This paper introduces a magnetic-assisted docking pole designed to address safety hazards associated with manually supporting hoisted objects during hoisting operations. A finite element model is established based on relevant parameters to analyze the forces acting on the magnetic-assisted pole in its operational state. Utilizing the finite element method, stress analysis simulations are conducted to assess the maximum working stress and shear forces experienced by the entire pole and its individual components under operational conditions. Experimental results demonstrate that the maximum stress values for all components of the magnetic-assisted docking pole remain below the permissible levels defined in engineering design standards, thereby validating the structural stability and safety of the proposed system. The design of the magnetic-assisted docking pole significantly enhances on-site operational safety for workers and complies with the safety management requirements outlined by the Sinopec regarding “Hoisting Operation Safety Management”.
Numerical Analysis of Oil Flow Characteristics in Curved Pipes of Aero-Engine Lubrication System
Authors: Wang Fei , Li Yong , Zhu Zhibing , Jing Haolin
Published: January 2025

As an essential component connecting various parts of the lubrication system in areo-engine, the internal flow characteristics of the curved pipe play a vital role in the normal operation of areo-engine. In this paper, a geometric and mesh model of oil flow in the curved pipe are established, and the flow characteristics of oil in the curved pipe are numerically calculated using the Detached Eddy Simulation (DES) model. The influence of curved pipe angle and inlet oil velocity on the oil flow in the curved pipe is discussed separately. The results show as follows: (1) The curved pipe angle significantly affects the distribution of oil flow field in the pipe, and with the increase of curved pipe angle, significant flow separation phenomena occur in the outlet section; (2) The influence of inlet oil velocity on the distribution of oil flow field in the pipe is not significant. The results of this paper can provide reference for the design of pipelines in aero-engine lubrication system.