bluuebunny/crossref_metadata_2025_split huggingface dataset:
Elastic Spherical Cloak Driven by Bayesian Optimization
Authors: Yang 杨 Zhiwei 志伟 , Wang 王 Xiaofan 笑凡 , Xu 徐 Hongbo 鸿博 , Li 李 Xiaochao 晓潮 , Zhu 朱 Shan 杉 , Chen 陈 Huanyang 焕阳 
Published: December 2024

Abstract
The introduction of machine learning algorithms has revolutionized the design of invisible devices, particularly in the intricate domain of elasto-dynamics. In this study, we proposed a core-shell configuration to realize elastic sphere cloaks driven by a Bayesian optimization algorithm to pinpoint the optimal configuration with high precision. Numerical simulations in solid and aqueous environments were performed to validate the cloaking efficacy of our design and the parameters identified by the algorithm. The results closely agreed with the theoretical predictions, underscoring the robustness of the proposed method. This approach provides new insights into the design of elastic wave invisibility devices and has potential applications in underwater communication and sonar detection.
Discussion on the Strength Calculation Method for Connecting Bolts between Head Cover and Stay Ring of Pumped Storage Power Station in Unit Runaway
Authors: Li Chengjun , Zhang Xin , Wang Changxin , Chen Liu , Chen Shunyi , Wang Delou , Hou Shanshan 
Published: December 2024

Abstract
The units of pumped storage power plants are frequently started and operate under complex modes. There have been many fracture accidents of connecting bolts between head cover and stay ring in China and abroad, resulting in flooding of the plants, affecting the safety of personnel and property. The unit runaway mode is one of the controlling modes in the calculation of head cover bolts. Due to the unstable flow in this mode, it is difficult to accurately obtain the head cover load, which affects the accuracy of bolt strength calculation. This article explores the relevant calculation methods through an example of the strength review calculation of the head cover and stay ring connecting bolts of a pumped storage power station. A method was proposed to perform CFD steady state calculations on several characteristic points of the runaway mode using one-dimensional transient calculation dates as boundary conditions, and then correct the result of head cover load calculation. The method in this article takes into account both the calculation time and accuracy, and has certain engineering practicality, which can be used as a reference for the industry.
Lift augmentation of a circulation control airfoil in proximity to water waves
Authors: Su Yuanzhao , Li Daochun , Zhao Shiwei 
Published: December 2024

Abstract
Wave is an important factor affecting the takeoff and landing of seaplanes. In order to study the effect of waves on the moving airfoil in proximity to the water surface, the influence of different wave parameters on the aerodynamic characteristics of the airfoil is investigated through numerical simulation by solving the Reynolds-averaged Navier-Stokes equations. Moreover, the lift-augmentation effect of constant blowing on the circulation control airfoil in proximity to water waves is investigated. The results show that the higher the wave height and the longer the wavelength, the larger the fluctuation amplitude of the lift coefficient of the airfoil. the lift-augmentation efficiency of the circulation control airfoil decreases significantly after the blowing momentum coefficient exceeds a certain value. When the airfoil is close to water waves, the increase of the blowing momentum coefficient not only augments the lift of the circulation control airfoil, but also aggravates the fluctuation of the lift force.
Study on On-line Monitoring method for Local Slagging in the Coal-Fired Boiler Furnace
Authors: Zhang Qichao , Ye Nina , Wu Xiaojiang , Zhang Zhongxiao , Xu Jiaye 
Published: December 2024

Abstract
Slag formation in coal-fired boiler furnaces is an unavoidable issue, which is further exacerbated by the combustion of Zhundong coal. The accumulation of slag in the furnace can reduce the heat exchange capacity of the boiler, leading to a decrease in power generation efficiency and operational economy. However, there is currently a dearth of monitoring techniques to evaluate the local slagging status in the furnace. To address this gap, this study proposes an innovative approach by installing multiple thermocouples on water wall tubes and fins to establish an online monitoring model for local slagging based on temperature differences. The effectiveness of this model has been validated on a 660 MWe utility boiler. The monitoring results reveal that the slagging in the furnace is uneven and asymmetrical in both the circumferential and longitudinal directions. The central region of the water wall in the circumferential direction is particularly prone to slagging, and the main combustion zone exhibits the highest slagging rate, while the burnout zone experiences the lowest. Moreover, the slagging rate in various regions is influenced by the unit load. It is directly proportional to the load in the main combustion zone, inversely proportional in the furnace bottom zone, and relatively unaffected by the load in the burnout zone.
Analysis of prevention measures for the environmental effect of vacuum combined surcharge preloading
Authors: Lin Lujie , Liu Zhifang , Zhang Qinghua , Liang Zhu 
Published: December 2024

Abstract
Soft soil is widely distributed in the Pearl River Delta region of China. In the process of treating soft foundations, it is important to consider not only the effect of preloading consolidation but also the impact of construction on the surrounding environment. This article focuses on the soft foundation reinforcement treatment project of a municipal road in Hengqin, Zhuhai, and utilizes finite element software ABAQUS to establish a vacuum-combined preloading soft foundation reinforcement model. Six working conditions are set up for two prevention and control measures: digging side ditches and driving cement mixing piles. The changes in soil deformation caused by these measures are analyzed with different distances from the reinforcement area boundary, different ditch depths, and different pile lengths. The results indicate that excavating side ditches and installing cement mixing piles can effectively reduce deformation of the outer soil. As distance from the side ditch (or cement mixing pile) increases, their weakening effect on deformation gradually decreases. Excavating side ditches can achieve a weakening effect within 8-10 meters outside the ditch, while installation of cement mixing piles has an approximate range of 7-10 meters on both inner and outer sides of the piles. Furthermore, excavating side ditches shows better reduction in horizontal displacement compared to driving cement mixing piles at a lower cost. These research findings provide valuable insights for widespread application of vacuum-combined preloading methods in soft foundation treatment within the Pearl River Delta region.
Study on structural analysis technique of loess tunnel based on multi-index evaluation
Authors: Yao Guang 
Published: December 2024

Abstract
The geological environment of loess tunnel is very complicated in the process of construction and operation, and the actual supporting parameters and surrounding rock pressure of loess tunnel have great uncertainties, which increases the difficulty of performance evaluation. In this paper, a distributed optical fiber monitoring system for loess tunnel is established by means of field investigation, theoretical analysis and field monitoring, which can monitor the tunnel displacement rate, the initial steel arch stress, the axial force of the anchor bolt, the lining stress and the width of the lining crack. Based on the theory of extension, the long-term performance evaluation model of loess tunnel is established, which comprehensively and objectively considers the influence of various influencing factors on the long-term performance of the tunnel, makes a quantitative judgment on the long-term performance of the typical section of loess tunnel, and provides a theoretical basis for the next tunnel maintenance plan, which is of great significance for the improvement of the maintenance technology of loess tunnel.
Research on Properties of Friction Stir Welding Butt Joint of 6061-T6 Aluminum Alloy Sheet
Authors: Cheng Rui , Zheng Zhenxing , Qin Lei , Gao Qun 
Published: December 2024

Abstract
The friction stir welding (FSW) butt joint of 2mm 6061-T6 aluminum alloy was tested. The effects of welding speed and lower shoulder pressure on the microstructure and mechanical properties of the joint were analyzed, and the possible problems in the welding process of thin plate were analyzed in depth. The results show that the yield strength of the welded joint of 6061-T6 aluminum alloy increases with the increase of welding speed, and the mechanical properties of the joint are not sensitive to the change of the pressure under the shoulder. The core area of the welded joint is the weakest area due to the softening of the welded joint and the insufficient amount of plastic metal transfer.
Unstable oscillation of a particle described by digits of pi
Authors: Rajilić Zoran , Malivuk Gak Dragana , Škrgić Enes 
Published: December 2024

Abstract
We ćonsider 3, 1, 4, 1, 5, 9, … as a time series desćribing osćillation of a partićle. The level of instability is defined using two of ten forće parameters assigned to the time series. Irrationality of the number p ćan then be seen through instability of motion, using Newton’s sećond law. If we intervene in digits, making a rational number, with termination or a repeating sequenće, level of instability slumps to zero. New rules for digits of p are found out. High instability is ćonnećted with strong damping and driving forćes. Tendenćy to a moderate instability is observed. Unrealised series of digits, ćlose to the realised series, derogate this tendenćy.
Effects of 660 nm red light and 850 nm near infrared light on human blood lymphocytes
Authors: Softić A. , Cipurković S. , Avdić A. 
Published: December 2024

Abstract
The applications of light emitting diodes (LED) as a red light therapy (RLT) source for the management of various conditions such as wound treatment, control of inflammation and pain have been growing continually. Despite its extensive medical application, the effects of RLT on living cells are still highly contested. This study is conducted to test the effects of RLT using combined LED source with 660 nm (red) and 850 nm (near infrared) light on cultured human lymphocytes in vitro. To analyze the effect of RLT on human peripheral blood lymphocyte’s proliferation, the mitotic index (cytostatic effect) is monitored under different irradiation exposure time parameters and conditions. This value indicates how a particular treatment affected cell division, either proliferatively, inhibitory, or had no effect at all. The interpretation of the results of the mitotic index is done in relation to the mitotic index of the untreated (unirradiated) control cells. Our data shows higher lymphocyte proliferation for all of the irradiated samples, and is particularly enhanced by multiple exposures to red light. The effectiveness of RLT on cell activity is of importance in determination of suitable treatment for diseases related to the immune system. To better understand the molecular and metabolic mechanisms involved in red LED-induced photobiomodulation, the study will be extended to investigate the RLT effect on cell protein synthesis.
Investigation of Topography and Electrical Properties of K0.3MoO3 Thin Films
Authors: Đekić Maja , Husković Belma , Spreitzer Matjaž 
Published: December 2024

Abstract
In this article we investigate topography and electrical properties of potassium blue bronze thin films by the means of atomic force microscopy. Thin films were prepared by pulsed laser depositions on two types of substrates (Al2O3 and SrTiO3) at different substrate temperatures and partial oxygen pressures. On the basis of topography measurements, granular nature of the films was revealed. Surface roughness, as well as the size and the orientation of grains was determined. Films deposited on SrTiO3 substrates are quite homogeneous and the grains display ordering in preferential directions. Films on Al2O3 contain randomly oriented grains. Roughness of the films increases with the increase of the deposition temperature. Electrical measurements provided qualitative information regarding the electrical properties of the films.
The Effects of AR-Based Physics Homework on Learning Circular Motion
Authors: Vidak Andrej , Movre Šapić Iva , Simić Bojana , Mešić Vanes 
Published: December 2024

Abstract
In this study, we compared the effectiveness of AR-based homework, traditional homework, and mixed-approach homework in learning about circular motion. To that end, we conducted a pretest-posttest quasi-experiment involving 135 first-year students enrolled in an introductory physics course at the University of Zagreb, Faculty of Chemical Engineering and Technology, Croatia. The students in the experimental group completed augmented reality (AR)-based homework assignments. In these assignments, their learning about circular motion was supported by a meticulously designed worksheet that included four AR-supported activities. In the mixed-approach group, students were given a homework assignment that included three AR-supported activities and one quantitative textbook problem, whereas the traditional group’s homework consisted of four quantitative textbook problems covering the same content. Findings from our study suggest that the post-treatment scores for all groups were significantly higher than the pretreatment scores, with the largest pre-post gains observed in the mixed-approach group. We conclude that combining carefully selected quantitative problems with key AR activities is the most promising approach.
Observed trends in full-daytime and part-daytime thermal stress conditions in Asia
Authors: Yan Yechao , Xu Yangyang , Yue Shuping 
Published: December 2024

Abstract
Changes in environmental thermal conditions affect thermal comfort, work performance and human health. While many studies have focused on heat and cold extremes, which are typically stressful throughout the daytime hours, fewer have examined part-daytime thermal stress conditions, where hours of thermal comfort and discomfort both occur during the daytime. Using a recently developed dataset of the Universal Thermal Climate Index with high spatial (10 km) and temporal (hourly) resolution, we classify daytime outdoor thermal conditions of any day into the following types: full-daytime comfortable, full-daytime stressful (subdivided into ‘full-daytime cold’ and ‘full-daytime hot’), and part-daytime stressful (including ‘part-daytime cold,’ ‘part-daytime cool,’ ‘part-daytime warm,’ ‘part-daytime hot,’ and ‘wide thermal fluctuation’). We then analyze their trends and the balance between changes in heat and cold stress over the past three decades in mid- and low-latitude Asia. Here, we demonstrate that overall daytime outdoor thermal conditions have deteriorated in both low- and mid-latitude Asia. A key feature of the changes in low-latitude regions is the substantial increase in the number of full-daytime hot days and a pronounced escalation in heat stress intensity, which may make outdoor activities during the day increasingly uncomfortable and possibly unsafe. In contrast, notable aspects of the shifts in daytime thermal conditions in mid-latitude regions include a decrease in full-daytime comfortable days (conditions ideal for longer activities such as hiking and camping), and a significant rise in part-daytime hot days, which may lead people to favour shorter activities (e.g., morning walks or neighborhood biking).
Phenological multivariance of Betula pendula Roth in an anthropogenically transformed environment
Authors: Turmukhametova N V , Turmukhametov D B 
Published: December 2024

Abstract
The article presents the results of long-term biomonitoring based on the phenology of the arboreal species Betula pendula of the city of Yoshkar-Ola, Russia. The phenological multivariance of B. pendula was studied for the first time at different stages of the ontogenesis of the generative period, in the gradient of atmospheric air pollution by industrial and automotive toxicants. The rhythm of seasonal development of B. pendula depends on both individual and age characteristics, as well as on the influence of conditions of a specific urban microclimate and environmental pollution. Middle-aged generative individuals of B. pendula are characterized by earlier periods of the onset of phenophases, rapid leaf unfolding, prolonged flowering, yellowing of leaves and, in general, the growing season, compared with young and old generative trees. The asynchrony of seasonal development is characteristic mainly for trees located in the zone of medium pollution. Under conditions of a specific microclimate and air pollution, heterogeneity within ontogenetic groups B. pendula increases. The adaptation of B. pendula individuals to adverse weather factors and urban conditions is determined by the diversity of phenorhythmogroups in the generative period of ontogenesis.
Calculation of heat loss for choosing a heating system in the chamber
Authors: Denmukhammadiev A M , Pardaev A I , Abdullayev M X , Urinov B 
Published: December 2024

Abstract
The work studied the features of the chamber (linear dimensions, wall materials, etc.). It was revealed that the smaller the temperature difference between the environment and the air temperature inside the chamber, the lower the percentage of losses in the chamber. It has been established that due to the convective action, the hot air in the chamber predominantly rises upward. In this case, the heating elements were connected in series with each other. Power was supplied from a 220 V network through power lines. We have developed a system for monitoring the temperature inside the chamber and lamp operation in the Automation Studio 5.2 program. This system allows one to regulate the air temperature inside the chamber. Calculations were also carried out to identify the effect of temperature differences on heat loss in the chamber device. Experiments and engineering calculations have shown that in a small chamber the temperature required for seed germination cannot be achieved immediately. In the two - position closed chamber load plot, the energy consumption area is 9.4% larger than the energy consumption areas of the subsequent periodic energy consumption areas. It can be seen that heating the chamber itself requires additional electricity.
Durian waste valorization – some research tendencies: a review
Authors: Zhivkova Vanya 
Published: December 2024

Abstract
This review aimed to present a general framework of some recent research trends and highlights reflecting the current status of durian waste valorization opportunities, applying the descriptive approach. In this regard, research was conducted on the keywords “durian waste” among the most used scientific databases, and the selected and included scientific publications are far from exhausting all the available and accessible literature on the subject under consideration, the complete detailed bibliographic description of which is beyond the scope of the present review. At the forefront, as a priority in many of the diverse researches, is the pursuit of achieving basic circular goals and sustainable principles related to reducing the total amount of durian waste, the search for effective methods for their safe treatment and storage, the development of methods to add value, the implementation of strategies to transform those considered as waste into useful raw materials and resources that can be subjected to recovery to obtain material goods with a view to their effective ecological valorization. As a result of the literature survey, among the main areas that are intensively worked on in the current conditions for the utilization of durian waste, the following could be mentioned: chemical compounds extraction and bioactivity characterization; activated carbon and sorption properties; nanoparticles; anaerobic digestion and biogas production; biodiesel; bioethanol; briquettes and pellets; ink; packaging; animal feed; food systems; as well as some other valorization directions and research tendencies. Conducting numerous studies in such diverse directions shows the overall importance for society of the subject under consideration, related to the proper treatment of durian waste, the application of appropriate strategies for their effective and successful utilization, emphasizing the need to summarize and systematize the recent state in the current progress regarding the valorization of durian waste, which allows and enables periodic renewal and updating of information.
Determination of irrigation standards for winter wheat through monitoring of groundwater levels
Authors: Khojiyev A A , Narziev Sh M , Akhmedov I , Kholmatova N G , Yusupkhodjayeva E N 
Published: December 2024

Abstract
This article presents field experiments widely used in the irrigation of winter wheat, monitoring the groundwater level. Data indicate that groundwater use in the Republic of Uzbekistan increases by 23-25 km³ per year. There is also the possibility for widespread use of groundwater to irrigate land plots with close groundwater levels and mineralization between 1 and 3 g/L in the Syrdarya region. During the study, an experimental field was divided into 16 small areas and processed four times on each one. Groundwater was artificially raised to depths of 1.0 and 2.0 meters, blocking closed horizontal drainage. According to the results, during the non-growing season, closed horizontal drainage blocked at a height of 0.1 m, groundwater levels were 27.2-29.8 cm. In the version with overlap at 2 meters - 28.9-31.1 cm, and in the control - 31.4-32.5 cm. During the growing season, when the closed horizontal drainage is blocked at a height of up to 1.0 cm, the groundwater level is 286-288 cm. In the variant where groundwater is blocked to a height of 2.0 m, the ground water level is 270-304 cm, allowing the use of ground water to increase the capillary moisture content of soil when watering winter wheat during low water years.
Determination of the filtration consumption from the body of the soiled dam
Authors: Samiev L N , Ch Ulashov Q , Sh Suyunov A , Mamatova D N , Xusanov Sh Sh 
Published: December 2024

Abstract
This paper addresses the pressing issues of climate change, population growth, and the imperative for efficient water resource management. It emphasizes the importance of effectively utilizing water stored in reservoirs and accurately assessing water loss. Specifically, the study focuses on quantifying water lost through the filtration process in earthen dam bodies and examining its impact on structural integrity. Measurements were taken at the Chimkurgan reservoir when it reached the upper water level mark (Δ 480.43), assessing the filtration depression curve and the flow rate of water exiting from hydroposts at each piezometer within the dam. Statistical analysis of data collected during field research indicated an average loss of 90 liters per second through filtration from both the body and floor of the dam over a year. This article explores the relationship between filtration water consumption, the depression curve, and the geological characteristics of the dam, providing insights into effective water management strategies.