bluuebunny/crossref_metadata_2025_split huggingface dataset:
Textbooks, hunger, and humanitarian narratives: representations of U.S. food policies to Germany on a regional scale (1949–89)
Authors: van Mourik Anne 
Published: November 2024

AbstractThis article investigates the significance of United States (U.S.) post-WWII food aid to Germany in West German textbooks from a regional angle during the Cold War period. Previous studies have predominantly focused on interpreting the significance of U.S. aid in West Germany from a national standpoint, overlooking regional variations in humanitarian narratives. This study challenges the national scale as the exclusive basis of collective meaning. By exploring educational materials from three different German regions—Berlin, Bavaria and North Rhine-Westphalia, it examines the different afterlives of U.S. aid in West German humanitarian narratives. Further attention for nuances in reconstructing humanitarian narratives not only does justice to the distinct regional histories and memory cultures, but also gives scope to reassessments of dominant narratives.
Design studies on electronics and data acquisition of a real time diamond spectrometer for the SPARC neutron camera
Authors: Petruzzo M. , Celora A. , Croci G. , Gallo E. , Gorini G. , Grosso G. , Nocente M. , Parisi M. , Putignano O. , Raj P. , Rigamonti D. , Rebai M. , Reinke M. , Scioscioli F. , Tardocchi M. , Tedoldi L. 
Published: November 2024

The design of a compact 2 × 2 diamond matrix with independent and redundant pixels optimized for the spectrometric neutron camera of the SPARC tokamak is presented in this article. Such a matrix overcomes the constraints in dynamic range posed by the size of a single diamond sensor while keeping the ability to perform energy spectral analysis, marking a significant advancement in tokamak neutron diagnostics. A charge pre-amplifier based on radio frequency amplifiers based on InGaP technology transistors, offering up to 2 GHz bandwidth with high robustness against radiation, has been developed. A first single-channel device has been tested and proven to provide a fast signal development time of 20–25 ns, necessary to mitigate pileup effects while offering precise energy measurements. As the diamond sensors may suffer from polarization effects due to the trapping of charges at the diamond/metal interface, a periodical bias inversion can guarantee optimal performance. To facilitate that, a reversible high voltage power supply has been developed. The ongoing development of data acquisition equipment and real-time processing algorithms based on programmable gate arrays further enhances the neutron camera’s capabilities.
Baseline assessment of microplastics and biochemical response of Anadara antiquata as a sentinel species for biomonitoring in Fiji
Authors: Varea Rufino , Dehm Jasha , Mani Francis 
Published: November 2024

Context Microplastics are a concern for maritime nations such as Fiji, which rely heavily on seafood, such as bivalves, which can transfer pollutants through the food chain. The lack of biomonitoring studies in the Pacific region highlights the necessity of researching microplastic pollution in seafood. Aims This study quantifies microplastics in Anadara antiquata, a commonly consumed shellfish in Fiji, and evaluates its general biochemical responses. As a baseline, this study is not to draw an association between the two endpoints (microplastics and biochemical responses), rather present these as baselines for future studies. Methods A total of 58 specimens from Ba River Delta, Rakiraki Bay and Vueti Navakavu were examined, where differences in potential sources or pathways for microplastics, including anthropogenic pollutants with the potential to induce stress on marine animals, were considered (rivers, industrial zones, stormwater outlets, sewerage outfalls and mining area). Specific hepatopancreatic enzyme activities associated with detoxification (glutathione-S transferase, GST) and oxidative stress (glutathione peroxidase, GPX, and glutathione reductase, GR) were measured. Key results Microplastics were extracted, classified by morphology and quantified. The study found that 64% of specimens had microplastics, <1.0 mm being more prevalent. Ba River Delta showed significant biochemical stress (Kruskal–Wallis test; P < 0.05) with GST (χ2 = 40.28, d.f. = 2, P-value < 0.001), GPX (χ2 = 38.38, d.f. = 2, P-value < 0.001) and GR χ2 = 45.14, d.f. = 2, P-value < 0.001) being considered as likely to be responding to pollution. Conclusion As a baseline, the study underlines the need for biomonitoring as a result of varying and concerning levels of pollution and biochemical stress responses found across the study areas. Integrating biomonitoring methods into risk-assessment protocols in Fiji may support establishment of opportunities or considerations for health guidelines and policy interventions to minimise human exposure to microplastics, and regulate environmental pollution. Implications These measures are crucial for protecting public health and monitoring pollution impacts.
Study on Adaptability of Progressing Cavity Pump for Huff-n-Puff Liquid Extraction Well
Authors: Li Mingzhu , Yu Shuang , Jiao Jinsheng , Dai Aiqi 
Published: November 2024

AbstractAccording to the deployment of “profile control, water shut-off, liquid extraction and liquid control” of the fault block, the development requirements of edge coordinated huff-n-puff and local liquid extraction, some oil wells in this fault block need to implement liquid extraction with large pumps. However, as the amount of carbon dioxide injection and the number of huff-n-puff rounds continue to increase, new problems are brought to the liquid extraction. The rotor, drive rod and oil pipe of the progressing cavity pump are prone to corrosion and even well lying. Secondly, the properties of the formation produced fluid change, and the produced fluid is mismatched with the progressing cavity pump stator, causing the progressing cavity pump stator rubber to swelling, degumm, and cause the pump to jam. With the gradual expansion of the application field of progressing cavity pump oil production technology, the continuous adjustment of oil field development technology policies, coupled with the changes in complex well conditions and production characteristics, Higher requirements have been put forward for its adaptability, and research work combining theory and practice needs to be continuously improved.
Application effect of temporary plugging and diverting fracturing technology in well X1
Authors: Li Yuntao 
Published: November 2024

Abstract
The deployment of horizontal well development in the sweet spot area of the main sand body can improve the reservoir control degree and the production of a single well. The X1 well in the X block will be put into production after fracturing in 2022. The target layer of this well is a tight reservoir with low porosity and low permeability, and natural fractures are not developed. Combined with the geological characteristics of the target well, horizontal well soluble bridge plug and temporary plugging and diversion fracturing technology are applied to well X1, and branch fractures are formed through temporary plugging and diversion in the fracture, which increases the complexity of fractures and increases the drainage area. The well is currently in production for 485 days, with a peak oil day of 17.4t and a current oil day of 7t, with a cumulative oil production of 4184.6t. In this paper, the fracturing effect of well X1 is preliminatively analyzed, and it is concluded that under the same reservoir conditions, the single particle size sand combined with temporary plugging in the fracture transformation has a relatively good development effect, which can obviously improve the development effect of tight reservoir. The application effect of soluble bridge plug and temporary plugging diversion fracturing technology in this well has certain reference significance for improving the development effect and benefit of horizontal well in ultra-low permeability reservoir.
Study on plugging mechanism and acidizing plugging removal technology of shale reservoir
Authors: Shu Hui , Du Juan , Liu PingLi , Chen Xiang 
Published: November 2024

Abstract
Ordos Basin is rich in unconventional oil and gas resources. Shale resources are developed in source rock series. With the continuous development, many oil wells have different degrees of blockage in the production process. It has different levels of complex performance in wellhead, wellbore and formation, which seriously restricts reservoir production. The formation fluid, reservoir rock samples and plugging materials were analyzed from multiple angles by means of nuclear magnetic electron microscopy, X-ray and acid dissolution to determine the source and formation mechanism of plugging materials. The analysis results show that the main component of the formation mineral is quartz, and the formation crude oil is mainly alkane. The scale sample is a mixture of formation minerals, scaling and corrosion products, and the content varies greatly. It is considered that the particle migration in the reservoir is an important cause of inorganic damage, and the organic matter damage cooperates with the inorganic damage to make the damage more serious. On this basis, this paper puts forward the organic cleaning of wellhead and wellbore, and then inorganic plugging removal of formation plugging, and constructs the deep acidification system of 12 % HCL + 10 % HBF4 and 10 % GT-α. The experiment shows that the effective production ratio can reach 3.6, and the effect of acidizing and plugging removal is remarkable. This study has formed an effective plugging treatment technology for shale reservoir, which can provide technical support for similar reservoir acidification.
Democritus and Aristotle: Are there atoms and empty space?
Authors: Gregory Andrew 
Published: November 2024

Abstract
Democritus of Abdera, one of the first atomists and Aristotle the great philosopher and systematiser radically disagreed on what the world was made of. Democritus said there were atoms and empty space, while Aristotle’s view was that there were no atoms and no empty space. There were further disagreements on how to explain phenomena, how many worlds there were and how this world had come about.
Characterization of influence of high spindle speeds on self-lubricating bearing system
Authors: Chen C M , Chang H L , Chien C Y , Lin W H 
Published: November 2024

Abstract
This paper studies the influence of bearing speed under a self-lubricating system. In the early 20th century, specialized precision manufacturing companies were founded, further establishing ball bearings as a very valuable, high-quality, and easily accessible mechanical component. This study used a self-lubricating system to achieve constant temperature and precision control. The spindle speed was analysed and tested at three speeds under a fixed pre-loading of 13000 N and a fixed lubricating oil viscosity index of 15. The results showed the spindle speed increases, the heat generated increases, and internal component temperature changes also increase. When the spindle speed is 12,000 rpm, the temperature of the inner ring of the bearing increases and changes by 166.4 %, causing fatigue and scratch wear at the same time. Using a lubricating oil self-lubricating system can slow down the temperature rise rate of components. The operation system can quickly reach a stable state, reducing thermal deformation and temperature accuracy errors.
Design and fabrication of micro carbon dioxide sensor based on TiO2 thin film
Authors: Chan H J , Liou J C , Fu L M , Lee C Y 
Published: November 2024

Abstract
A micro-electro-mechanical systems (MEMS)-based micro carbon dioxide sensor is fabricated using conventional photolithography, electron beam evaporation, and radio frequency sputtering techniques. The sensor consists of a titanium dioxide sensing layer, interdigital electrodes (IDEs), a platinum resistance temperature detector (RTD), and an aluminium oxide substrate. Given a working temperature greater than 300°C, the resistance of the titanium dioxide sensing layer increases linearly with an increasing carbon dioxide concentration. Fluctuations in the working temperature are detected by the RTD and compensated using a proportional-integral-derivative (PID) feedback control system implemented in LabVIEW. The temperature detection results reveal that the RTD has a sensitivity of 1.3 mV/°C. The sensor is calibrated using a standard carbon dioxide detector and is used to perform carbon dioxide sensing at working temperatures of 300°C, 350°C, and 400°C, respectively. It is shown that the highest sensitivity of (0.179 MΩ/ppm) and fastest response time (15 seconds) are attained at a working temperature of 350°C.
Flow behaviors of various metals under tensile load
Authors: Kim N Y , Razali M K , Hong S M , Joun M S 
Published: November 2024

Abstract
The influence of flow behaviors on the results of finite element (FE) analyses of metal-forming processes is dominant, even though it varies with strain hardening and softening phenomena. However, obtaining a flow curve with sufficient accuracy is not easy, particularly at large strains. Among various well-known methods of obtaining flow curves, tensile testing-based method is effective to obtain flow curves at large strains at room temperature. It is believed that the strain hardening behavior at large strains during the tensile test was not fully known. In this study, the flow curves, previously obtained using the combined tensile test and finite element method (FEM) approach, are classified as four categories, including monotonic strain hardening function, double-curvature strain hardening function, strain hardening-perfectly-plastic function, and perfectly-plastic-strain softening function. The tensile test characteristics of each type are investigated using its FE predictions, revealing that the specific type of a material can be identified by the tensile test.
Design and analysis of extrusion die for T-shaped sheet materials
Authors: Chen D C , You C S 
Published: November 2024

Abstract
The study explores plastic deformation behavior of T-shaped plates using DEFORM™ 3D, a perfect plastic finite element analysis software that considers T-shaped and double T-shaped extrusion dies as rigid bodies and compares effective strain, effective stress, blank temperature, die wear and temperature conditions. Moreover, the study employed the machine learning step descent method to predict effective stress and effective strain. Furthermore, the Pearson product difference correlation was utilized to examine the relationship between effective stress, effective strain, and temperature in T-shaped extrusion. Lastly, META analysis was conducted to synthesize statistical data on effective stress and temperature from various research.
Determining the bilinear flow stress of thin films by comparing load/depth and sink-in/pile-up behavior between nanoindentation and FEM
Authors: Yang T S , Chang S Y 
Published: November 2024

Abstract
It is known from the literature that the load-depth curve obtained by nanoindentation cannot uniquely determine the plastic flow stress behaviour of the material. In this study, the sink-in/pile-up of nanoindentation is another important information for predicting the elastic-plastic behaviour of thin film. Therefore, by comparing load/depth behaviour and sink-in/pile-up from nanoindentation with finite element analysis, the bilinear flow stress of the coating can be determined. Commercial TiN coatings are currently used as an example for this study. The bilinear flow stress of TiN can be determined by this method: the elastic modulus of 343.007 GPa, the yield stress of 10.458 GPa and the tangent modulus of 214.080 GPa. In addition, the stress of loading and unloading during the nanoindentation of the thin film was also investigated.
Numerical research of functionally graded magneto-electro-elastic structures under thermal environment via the thermo-mechanical-electro-magnetic enriched finite element method
Authors: Wang Jiye , Zhou Liming , Liu Peng , Tian Hailong , Zhao Hongwei 
Published: November 2024

Abstract
In this work, the functionally graded magneto-electro-elastic (FG-MEE) structures were used to study mechanical performance under a thermal environment using the thermo-mechanical-electro-magnetic enriched finite element method (TMEM-EFEM). Through enhancing the traditional solution space of the finite element method (FEM), additional degrees of freedom are introduced without modifying the mesh structure. Therefore, as a class of higher-order finite element methods, field variables with high gradients can be captured without a relatively finer mesh. The accuracy of TMEM-EFEM is improved by using interpolation covers. The feasibility of TMEM-EFEM is proven by numerical examples. The proposed TMEM-EFEM is proven to be accurate under the relatively coarse mesh. Through numerical examples, the high accuracy of TMEM-EFEM is demonstrated. Therefore, TMEM-EFEM can be a good alternative for the statics study of FG-MEE structures.
Research on design method of lattice turbine disk based on topology optimization
Authors: Lu Siwei , Jia Hanhan , Qian Zhengming , Deng Lijun , Zhou Zetang 
Published: November 2024

Abstract
As a typical structure of an aero-engine, turbine disk has been used in high-temperature and high-speed environments for a long time, and its mass accounts for a large proportion. Therefore, its lightweight design is urgent. With the development of an aero-engine towards a high thrust-to-weight ratio, the turbine speed continues to increase, and the single-stage load continues to increase, which makes the design of the turbine disk face more problems and challenges. The uniform material turbine disk structure has made it difficult to meet its comprehensive performance requirements. To address this issue, this paper proposes a lattice turbine disk design idea, changing the uniform organization pursued by traditional design and achieving optimal performance through the integration of design innovation and manufacturing process innovation. This paper takes the turbine disk as the research object to establish a lattice turbine disk design method. By using the topology optimization method based on progressive optimization, the cell configuration can be obtained. After that, combined with the structural characteristics of the turbine disk, the design of the dot matrix auxiliary plate disk is realized. Finally, taking a turbine disk as an example, this paper carried out the optimization design of the turbine disk and obtained the lattice disk with better performance, which verified the feasibility of the method.
A new type of arc-plate flexible driving foot stick-slip piezoelectric actuator
Authors: Liu Sihan , Yang Yang , Wu Tong , Liang Tianwei , Wang Yunyi , Liu Peng 
Published: November 2024

Abstract
Because of its high precision and high speed, stick-slip actuators in piezoelectric actuators have important research significance in aerospace and other fields. To make the performance of the actuator superior, a high-performance stick-slip actuator suitable for the aerospace field is developed. In this paper, based on the in-depth study of the related theories, a kind of arc-plate flexible driving foot is proposed. On this basis, a kind of arc-plate flexible driving foot stick-slip piezoelectric actuator is designed to further improve the performance of the actuator. After the test, its maximum speed can reach 4.12 mm/s, and the maximum load is 330 g.
PID control for the water-air hybrid aquatic-aerial vehicle’s exit based on simulated annealing genetic algorithm optimization
Authors: Dong Sitong 
Published: November 2024

Abstract
A hybrid aquatic-aerial vehicle is a special equipment with the ability to perform amphibious operations in water and air, and its control accuracy and stability during the water outflow process are crucial for ensuring the safety and operational efficiency of the vehicle. This article first constructs the kinematic and dynamic models of the hybrid aquatic-aerial vehicle and designs the basic control strategy based on a PID controller. Given the limitations of a single PID control strategy in specific contexts, this study proposes a PID controller based on genetic algorithm optimization and introduces a simulated annealing algorithm in the optimization process of the genetic algorithm to make the adjustment of controller parameters more precise and efficient. Through simulation verification, it was found that the optimized PID controller improved the performance of the aircraft during the outflow stage, indicating that this optimization control strategy has a positive impact on improving the operational performance of the aircraft.
Investigation into the effect of impact damage on compression behavior of the omega-stiffened composite panels
Authors: Cao Su , Li Lei , Pang Baocai , Wei Jingchao , Cheng Linan 
Published: November 2024

Abstract
With superior performance and weight-saving potential, composite structures have been increasingly applied in the aerospace industry. The damage process and post-buckling deformation of composite panels under compressive load have been proven to limit the application of composite structures. For the purpose of utilizing the full potentiality of thin-walled composite structures, an experimental investigation was employed to explore the influence of impact damage on the buckling behavior and the load-carrying capacity of omega-stiffened composite panels. Pristine panels and impact-damaged panels were under compressive load until failure. The results showed that the pristine panels had higher compressive stability and ultimate strength, and the existence of impact damage led to a decline in the buckling load and the carrying capacity, which were up to 16% and 27%, respectively. Additionally, the complex stress state caused by the introduced impact damage influenced the buckling response and the damage patterns of the omega-stiffened panels. The pristine panels exhibited typical compression failure mode, with matrix crack and fiber breakage in the stringer and the skin. However, the collapse of the pre-damaged panels was dominated by the debonding of the skin-stiffener interface and the out-of-plane deformation of the skin.
A study on the effect of cylindrical shell scaled model size on ESCM prediction accuracy
Authors: Du Donghai , Chen Chen , Wang Jiachun , Li Daokui , Zhou Lilin 
Published: November 2024

Abstract
Current research on similitude theory has introduced numerous methods to address the distortion similitude model. However, these methods still encounter some challenges in guiding the design of scale models, such as insufficient accuracy and a limited range of design sizes. In this paper, the Energy Similitude Correction Method (ESCM) is used to analyze the effect of size design on the accuracy of cylindrical shell-scaled models, taking into account distortion factors such as wall thickness and thermal environment. The research shows that the closer the model size is to the prototype size, the higher the prediction accuracy is. Additionally, larger size combinations are more reliable for predicting the prototype frequency in scaled model tests. The research results provide a basis for the reasonable design of the size of the scaled model group and make a positive contribution to improving the prediction accuracy of the scaled model.