bluuebunny/crossref_metadata_2025 huggingface dataset:
System Control of Prototype Forklift Using Android and ESP32 Based on MQTT Communication
Authors: Faris Faisal , Sulistiyowati Indah , Hayatal Falah Agus , Ahfas Akhmad
Published: December 2024

This research develops and tests a prototype forklift robot controlled via an Internet of Things (IoT)-based system using an ESP32 microcontroller and the MQTT protocol. Designed to overcome the limitations of traditional manual forklifts, the robot enhances warehouse operations by increasing efficiency and minimizing human error. The study presents the design, testing, and evaluation of the forklift robot's movement control, mechanical wheel performance, load capacity, and wireless connectivity across various Android devices and network providers. Testing was conducted over distances ranging from 1 km to 90 km with different Android devices (e.g., Samsung, Xiaomi, OPPO, Vivo) and providers (Indosat, Axis, Telkomsel, Smartfren). The robot successfully performed a variety of movements, including forward, backward, left, right, rotation, and lifting operations. It demonstrated stable load lifting capabilities up to 300 grams, with instability observed for heavier loads, and could operate smoothly across a range of network conditions. Connectivity tests showed consistent performance and stable communication, reinforcing the robot's practical use for remote control and real-time monitoring. This research emphasizes the potential of IoT-enabled forklift robots to optimize material handling processes in warehouses, contributing to safer and more efficient industrial environments
EPR spectroscopic and calorimetric study of minerals of the amblygonite–montebrasite series from rare-metal pegmatite of the Voroniye tundry (Kola peninsula) and Sangilen highlands (Tuva)
Authors: Vyatkin S. V. , Gritsenko Yu. D. , Ogorodova L. P. , Vigasina М. F. , Ksenofontov D. А. , Melchakova L. V.
Published: December 2024

For the first time, a comprehensive physicochemical study of minerals of the amblygonite LiAlPO4F — montebrasite LiAlPO4(OH) series was carried out. An EPR spectroscopic and calorimetric study of montebrasite LiAlPO4(OH)0.9F0.1 from rare-metal granite pegmatites Shuk-Byul (Sangilen Highlands, Tuva) and amblygonite LiAlPO4F0.5(OH)0.5 from pegmatites of the Voroniye tundras (Kola Peninsula) was carried out. Using the EPR method, radiation-sensitive paramagnetic O– centers were discovered, they were formed without the participation of impurity elements in regular sites of the crystal lattice. For the first time, the possibility of carrying out EPR geochronometry on minerals of the amblygonite–montebrasite series has been demonstrated. Using the method of high-temperature melt dissolution calorimetry on a Tiana-Calvé microcalorimeter, the enthalpies of formation from the elements ΔfH0el(298.15 K) = –2326.3 ± 2.2 kJ/mol of montebrasite with the composition LiAl(PO4)(OH)0.9F0.1 and of amblygonite with the composition LiAl(PO4) F0.5(OH)0.5 (–2347.9 ± 3.1 kJ/mol) were obtained; and the values of this parameter were calculated for the end members with ideal composition of the series: for montebrasite (–2315.5 ± 2.2 kJ/mol) and for amblygonite (–2401.6 ± 3.1 kJ/mol). The values of the standard entropy S0(298.15 K) and the Gibbs energy of formation ΔfG0el(298.15 K) for intermediate and end members of the amblygonite–montebrasite series are estimated.
The Role of UDP-Glycosyltransferases in Xenobiotic Metabolism
Authors: Kinareykina A. G. , Silivanova E. A.
Published: December 2024

UDP-glycosyltransferases (UGTs) are enzymes from a complex superfamily of glycosyltransferases. UGTs catalyze glycosylation reactions, i.e. the covalent addition of sugar from a cofactor (UDP-glycoside) to the corresponding functional group of a lipophilic substrate. These enzymes play a crucial role in cellular homeostasis of many groups of organisms (mammals, arthropods, plants, etc.). UGTs are the main enzymes of phase II detoxification of xenobiotics of various origins (metals, natural compounds, drugs, industrial pollutants, pesticides, etc.). The human UGTs arouse interest due to their role in drug metabolism and involvement in the development of drug resistance in cancer cells. UDP-glycosyltransferases of invertebrates (especially insects) attract the attention of researchers because of their involvement in the development of pesticide resistance. However, the exact role of individual UGT families and subfamilies in xenobiotic biotransformation remains unclear, highlighting the importance of further study of these enzymes. This review aims to provide an understanding of the diversity of UDP-glycosyltransferases in vertebrates and invertebrates (arthropods) and some details of the interaction of these enzymes with xenobiotics. The section on general information briefly describes the structure and localization of the enzymes of the superfamily UGTs, the enzymatic reaction and the mechanism of catalysis using UDP-glucuronosyltransferase as an example. In addition, this review presents the data on the impact of different xenobiotics (industrial pollutants, metals, pesticides, drugs and natural compounds) on the enzymatic activity of UGTs and the level of UGT gene expressions in vertebrates and invertebrates (arthropods). The diversity of UGT enzymes and their substrates reflects the wide possibilities of the animal organism to protect themself from xenobiotics.
Modern trends in the development of public governance concepts
Authors: Smotritskaya Irina
Published: December 2024

The article discusses theoretical and methodological approaches to the transformation of the model of public governance in the context of global challenges of a socio-economic and geopolitical nature. The main stages of the evolution of the theory of public governance are investigated, and a meaningful description of modern key development trends is given. Special attention is paid to the problem of political and administrative dichotomy, achieving a balance between political and administrative functions of public governance in order to increase the validity of managerial decisions. In the course of the research, in addition to theoretical concepts and practices, the fundamental principles and prerequisites for improving the effectiveness of public governance in order to achieve the strategic goals of the country’s development are considered.
On the issues of financing authorities transferred to regional and municipal budgets
Authors: Kutukov Anton
Published: December 2024

The article presents several points of spatial and economic development of Russia taking into account modern trends. The need to improve the model of authorities (powers) delegation in the context of fiscal federalism evolution in the Russian Federation is discussed in the Article. Particular attention is paid to the model according to which obligations are imposed on regional and municipal budgets taking into account their provision with sufficient funding.
The development of mechanical engineering in Russia in the context of fulfilling tasks to achieve national development goals
Authors: Afanasyev Aleksandr
Published: December 2024

The article discusses the prospects for fulfilling the tasks of achieving the national development goals of Russia in relation to the engineering sector. The preconditions for their implementation and the necessary government measures are described.
Based on the values of target indicators for achieving national development goals, the ratio of the main structural elements of the domestic market of mechanical engineering products in the perspective of 2030 is calculated. A conclusion is made about the upcoming significant reduction in the volume of imports and the recovery increase in exports while maintaining the existing level of availability of mechanical engineering products in the domestic market.
The problem of changing the potential of the economy in these conditions is considered. The key role of recreating research competencies in domestic mechanical engineering is determined.
On the employment of elderly citizens for the solution of staffing problems of enterprises
Authors: Tuguskina Galina
Published: December 2024

The article considers the employment of elderly citizens as one of the possible ways to solve the recently aggravated personnel problem caused by both the aging population and the falling birth rate. It has been established that, despite the gradually changing attitude of employers to older employees, a significant proportion of employers are still not ready to hire people of pre-retirement and retirement age, being convinced that employees over fifty years old are not ready for changes that require constant updating of knowledge. It is emphasized that the efficiency of older employees who are already working at enterprises is noted by both their colleagues and employers. Nevertheless, it’s young employees to whom employers usually provide the opportunity to undergo training in order to improve their professional qualifications, although people of all ages experience the need to update their professional knowledge and skills. Having analyzed the facts, the author comes to the conclusion that employers need to reconsider their attitude to the hiring of elderly citizens.
Demodulation of Pulsed Acoustic Signals in Strongly Non-Linear Propagation Regimes
Authors: Kvashennikova A. V. , Sergeeva M. S. , Yuldashev P. V. , Esipov I. B. , Khokhlova V. A.
Published: December 2024

A one-dimensional nonlinear problem of parametric generation of low-frequency radiation is considered in the case of a pulsed high-frequency initial excitation capable of forming shock fronts in the wave profile. A numerical algorithm for solving the Burgers equation in the time domain using a Godunov-type shock-capturing scheme is developed. Examples of the propagation of model frequency-modulated signals with different envelope shapes at different ratios of nonlinear and dissipative effects, which limit the interaction length of pump waves are considered. Examples of waveforms and spectra evolution during self-demodulation of a high-frequency pump signal are given, with self-demodulation manifesting at shorter distances in strongly nonlinear propagation regimes due to additional attenuation of the wave energy at shock fronts. It is shown that the efficiency of low-frequency radiation generation increases in shockwave propagation modes.
Validation of a Quadrupol Model of Sound Radiation of a Turbulent Jet Based on Multi-Microphone Acoustic Measurements
Authors: Kopyev V. F. , Chernyshev S. A. , Faranosov G. A. , Korobov A. A.
Published: December 2024

A low-order model of quadrupole sound sources in a turbulent jet has been developed using the acoustic analogy method. Multi-microphone acoustic measurements of jet sound radiation are used to estimate the model parameters and validate it. Based on measurements carried out in different zones of the sound field, estimates of the size of the effective localization region of sound sources are made and the boundaries of the zone of dominance of quadrupole sound radiation over pseudosonic pulsations are determined. The proposed model can be used in practical estimates of the spectral and correlation characteristics of the far and near sound field of the jet.
Changes in the expression of apoptosis-associated proteins in the temporal cortex and hippocampus of rats during long-term kindling and their correction with minolexin
Authors: Bazhanova E. D. , Kozlov A. A. , Sokolova Yu. O. , Suponin A. A. , Demidova E. O.
Published: December 2024

Epilepsy is one of the most common and serious diseases of the brain, affecting more than 70 million people worldwide. Available anticonvulsants are able to suppress seizures in two thirds of patients, and in the remaining third of patients, epilepsy is considered drug-resistant and other types of treatment are required, such as surgery, which also does not always lead to positive results. Overcoming resistance is a complex task that requires an understanding of the biochemical pathways and general pathological processes underlying epilepsy, primarily apoptosis. The purpose of this work was to study the effect of the antibiotic minolexin on the levels of apoptosis and the expression of apoptosis-associated molecules (p53, Bcl-2, caspase-3 and caspase-8) in the temporal cortex, underlying white matter and hippocampus of Krushinsky-Molodkina rats with hereditary audiogenic epilepsy with long-term kindling. Materials and methods. We used Krushinsky-Molodkina rats at the age of 11 months, which were subjected to audiogenic stimulation and administered intraperitoneally with 1 ml of saline solution or the second-generation tetracycline series minolexin at a dose of 45 mg/kg, dissolved in saline solution for 14 days. The temporal lobe cortex and underlying white matter, the hippocampus, were examined. Apoptosis levels (TUNEL) and expression of apoptosis-associated proteins (p53, Bcl-2, caspase-3 and -8) were assessed (immunohistochemistry, Western blotting). Results. In Krushinsky-Molodkina rats with hereditary audiogenic epilepsy, an increase in the apoptosis level was shown during long-term kindling. A p53-mediated, but caspase-independent mechanism of apoptosis activation has been identified. When minolexin was administered, an anti-apoptotic and neuroprotective effect was observed in the temporal lobe and hippocampus of rats.
Upaya Pengelola Yogyakarta International Airport dalam Menekan Angka Perilaku Merokok Melalui Ketersediaan Smoking Room
Authors: Legoningsih Astri Nine , Pratiwi Firdha Yovianti , Khalidah Karimatul , Setiawati Sulis , Afifah Yusriyyah Nur , Reza Muhammad Dhimas Alfa , Setiawan Andri , Kodriati Nurul
Published: December 2024

Rokok merupakan zat adiktif yang apabila dihisap secara rutin dapat menimbulkan kerugian bagi kesehatan individu dan masyarakat. Berdasarkan data Riskesdas 2023, jumlah perokok yang ada di Yogyakarta sebesar 232.346,63 jiwa. Peningkatan jumlah perokok di Indonesia mendorong pemerintah membuat kebijakan terkait rokok. Salah satunya adalah penerapan ruang khusus merokok di ruang publik seperti Yogyakarta International Airport (YIA) guna memastikan bandara sehat bebas asap rokok. Kebijakan ini meliputi larangan merokok di sembarang tempat, tersedia ruangan khusus untuk merokok, bebas dari iklan rokok, serta terdapat himbauan larangan merokok. Tujuan dari penelitian ini adalah untuk mengetahui upaya dari pengelola YIA dalam mengoptimalkan ruangan khusus merokok sebagai salah satu cara menekan perilaku merokok di YIA. Metode penelitian ini menggunakan pendekatan kualitatif dan teknik pengambilan data dilakukan dengan wawancara mendalam. Terdapat 4 informan yang dipilih di area check in YIA yang ditentukan dengan teknik penentuan sampel yaitu purposive sampling. Hasil dari penelitian ini adalah adanya penyediaan smoking room di YIA dikelola oleh masing-masing tenant di ruang check-in dan ruang tunggu pengunjung. Namun, belum semua pengunjung memahami sepenuhnya tentang keberadaan smoking room. Akibatnya, masih terdapat pengunjung yang merokok di luar area smoking room. Tingkat kesadaran pengunjung dalam menegur pelanggaran tersebut masih rendah karena beberapa pengunjung cenderung menghindari konflik dengan menjauh daripada mengingatkan. Kesimpulan dari penelitian ini adalah cara pengelola bandara dalam mengoptimalkan smoking room di YIA adalah dengan menyerahkan pengelolaan smoking room kepada masing-masing tenant. Pihak pengelola bandara YIA tidak memiliki program yang dikhususkan untuk menekan angka perilaku merokok di YIA. Pengelola hanya menyediakan fasilitas smoking room.
Atención en movimiento: la magia multisensorial en salas snoezelen
Authors: Cerón Palacios María Fernanda , Chamorro Hernández Daniela Valentina , Solarte Gaviria Luisa María , Ardila Villareal Ginna Marcela
Published: December 2024

Este estudio explora el impacto de la estimulación multisensorial en salas snoezelen sobre el desarrollo de funciones mentales en escolares. Estas salas están diseñadas para integrar estímulos visuales, auditivos y táctiles, demostrando potencial para mejorar procesos cognitivos. El objetivo consistió en analizar la efectividad de la estimulación multisensorial en la mejora de la atención y el desempeño ocupacional escolar, considerando los estilos de aprendizaje. En la metodología, mediante el test VAK, se identificaron los estilos de aprendizaje predominantes; con el test Stroop se evaluó el nivel de atención y con el cuestionario Sensory Processing Measure (SPM) se analizaron los patrones del procesamiento sensorial. A partir de los resultados, se diseñaron estrategias sensoriales específicas en la sala snoezelen, alineadas con las demandas ocupacionales y las actividades escolares. La unidad de trabajo fue escolares de 7 a 9 años de una institución educativa de Pasto, Nariño. Los resultados señalaron que la estimulación multisensorial contribuye significativamente al desempeño ocupacional escolar y promueve mejoras en la atención. Además, estos hallazgos generan conocimiento relevante para profesionales en las áreas de la salud y la educación. Finalmente, la estimulación multisensorial en salas snoezelen fue efectiva y mejoró la atención de los escolares. Por lo tanto, se requiere adaptar las intervenciones a los estilos de aprendizaje individuales con el fin de maximizar su eficacia, subrayando la importancia de estos entornos multisensoriales en prácticas educativas y terapéuticas.
Behavior of Axially Compressed Free-Spanned GFRP Pipes Under Local Loads
Authors: Mousavi Vahideh , Showkati Hossein , Fazlalipour Neda , Afshar Mohammad Saeed , Firouzsalari Saeed Eyvazinejad
Published: December 2024

Glass-Reinforced Polymer (GFRP) pipes are increasingly preferred in modern engineering applications such as chemical processing, marine structures, and water and sewage systems due to their superior mechanical properties, including a high strength-to-weight ratio and exceptional corrosion resistance. This study explores the combined effects of local loads and axial pre-compressive forces on free-spanning GFRP pipes through a series of experimental tests. Five pipe specimens, all with identical geometric properties, were subjected to axial pre-compressive forces ranging from 10% to 30% of the pipe’s cross-sectional fracture capacity, followed by local loading. The experimental results demonstrated a significant reduction in the ultimate load-bearing capacity of the GFRP pipes as axial pre-compression increased. Specifically, the load capacity decreased by approximately 67% when the axial pre-compressive load increased from 10% to 30% of the pipe’s fracture capacity. These findings provide valuable insights into the mechanical performance of GFRP pipes under complex loading scenarios, which are essential for the design and assessment of GFRP pipelines in practical applications.
Key Technology of High-Altitude Cantilever Cornice Formwork Support System Construction
Authors: Wan Chao , Dou Wei , Zhang Hao , Yang Kai
Published: December 2024

The Xianning Yong’an Pavilion scenic spot project is an imitation of the Song Dynasty. There are platform foundations on the first and second floors on the north and south sides of the main building, and there is no platform foundation on the east and west sides. The 4th, 6th, 8th, and 9th floors all have eaves that can be raised outside, and the length of the eaves is about 4 meters. Considering the long construction period and low work efficiency of the antique buildings, the overhanging steel platform support frame is considered as the formwork support for the eaves outside the eaves area, and the full hall scaffolding and protective outer frame are set up on the overhanging platform. The mechanical analysis of the relevant parameters of the support system using the safety calculation software proves the safety of the support system. Considering the long construction period and low efficiency of the antique building, it is considered to set up the cantilever steel platform support frame as the support frame of the eaves outside the cornice area, and set up a full scaffold and protective outer frame on the cantilever platform to ensure the safe production and construction quality.
Sensitivity Factor Analysis of Tower Foundation Slope Stability Based on Orthogonal Test
Authors: Zheng Wulue , Zheng Yangliang , Yuan Wenjun , Zhao Yanhui , Chen Qingpeng
Published: December 2024

The normal operation of the high-voltage transmission lines is seriously affected by the instability of the slope of the transmission line pole tower base. Taking the typical tower foundation soil of two high voltage transmission line towers in Guangdong as the research object, the sensitivity analysis of the influencing factors of tower foundation slope stability based on an orthogonal test was carried out by combining indoor experiment, theoretical analysis, and numerical simulation. The results show that 882# soil has greater cohesion than 902# soil, but the internal friction angle is smaller. The ExpDec2 mathematical model and ExpAssoc mathematical model can better simulate the soil-water characteristic curve of 882# soil and 902# soil. The range analysis of 4 factors and 4 horizontal orthogonal tests showed that slope height had the greatest influence on the stability of 882# soil slope, and slope angle had the greatest influence on the stability of 902# soil slope. This study shows that the main influencing factors of slope stability of two different soils in Guangdong are quite different, and they should be treated differently in the construction and operation of high-voltage transmission line tower projects.
Research on a New Type of Prefabricated Laminated Board External Attachment Tool
Authors: Zeng Yayuqiong , Zhao Yongqiang , Zheng Zhiyuan , Chen Huanxin
Published: December 2024

In recent years, laminated floor has been widely used in prefabricated buildings. Due to the limitation of the current construction technology of prefabricated layer and cast-in-place layer, the laminated floor is too thick as a whole. This problem is expected to be solved by seeking a kind of laminated board external tool technology and efficient construction technology. In this paper, the rigidity and bearing capacity of the prefabricated bottom plate are improved by using the external section steel technology, so as to reduce the thickness of the prefabricated bottom plate and the castin layer. The feasibility is verified from two aspects of technical principle and technology, and the technical advantages and disadvantages of the process are analyzed, including economic benefits, time costs, social benefits and technical difficulties. It is feasible to improve the stiffness and bearing capacity of the prefabricated bottom plate by using the technology of external section steel, and to ensure the force of the prefabricated bottom plate in the construction and demudding stage theoretically. From the technical process, the use of prefabricated bottom plate attached steel technology has increased the steps in the factory production process, increased the transportation times and transportation risks in the storage yard transportation, but reduced the workload in the construction stage, and the overall process is feasible.
High Temperature Performance of Hysteretic Steel Dampers
Authors: Wu Yanjun , Wang Rujing , Hou Guangyu
Published: December 2024

A hysteretic damper is a structural component designed to undergo cyclic plastic deformation in order to absorb energy to reduce damage to building structures. The primary objective of this study is to compare the performance of hysteretic dampers at room temperature with their performance under potential high-temperature conditions caused by post-earthquake fires. A geometric model of an effective steel hysteretic damper was developed and simulated in the ABAQUS software under cyclic loading conditions at both room temperature and simulated high-temperature fire conditions. The cyclic shear loading was applied to replicate earthquake wave frequencies. The simulation results were compared with published experimental results, thus validating the simulation model. The simulations indicate that, compared to room temperature, the energy dissipation capacity of the damper decreased by 24.4% under high-temperature conditions, and the effective stiffness decreased by 30.3%. The study highlights a significant reduction in the damping performance of the damper under high-temperature conditions. This factor may become a critical consideration in future research and design.
Production and Use of Cast Asphalt Concrete Mixtures for the Construction of Road Surfaces
Authors: Lupanov A.P. , Silkin V.V. , Fotiadi A.A. , Gnezdilova S.A. , Kozikov I.O.
Published: December 2024

This article presents the results of the authors’ research, which will contribute to improving the methods and methods of building roadways with coatings made of cast asphalt concrete mixtures with an increase in the quality of asphalt concrete mixtures without increasing the cost. The authors have proposed a mathematical model that allows us to establish the requirements for the shear stability of coatings made of cast asphalt concrete mixture, depending on the transport load and climatic conditions of the construction area. The article presents research data on the cooling of cast asphalt concrete mixtures, which in turn makes it possible to ensure the proper quality of laying such coatings at subzero air temperatures. As a result of experimental studies, optimal compositions of mixtures of cast asphalt concrete with the addition of asphalt granulate, plasticizing additive “Sasobit” were determined, which made it possible to ensure the shear stability of mixtures of cast asphalt concrete, to ensure the required properties of asphalt concrete mixtures within the regulatory requirements for fatigue properties and abrasion parameters of such coatings. The dependences of the influence of asphalt granulate on the transport and performance characteristics of cast asphalt concrete coatings on a polymer-bitumen binder have also been established.
Towards Integrated Ultrasonic Echo Location Imaging and Optical Multispectral Imaging of Polymer and Composite Materials and SLS Alloys for Civil Engineering or Hydraulic Engineering
Authors: Anshin Sergey M. , Biryukov Vladimir P. , Gradov Oleg V. , Prince Anton N.
Published: December 2024

Ultrasonic and optical defectoscopy are essential techniques for evaluating composite materials in construction and civil engineering. Ultrasonic testing is particularly effective for assessing the integrity of composite structures (to detect internal flaws, such as cracks, voids, and delaminations), which are increasingly used in modern civil engineering applications. Multispectral optical defectoscopy utilizes spectrozonal (R, G, B) and multispectral imaging to capture detailed information about the surface and subsurface characteristics of materials including structural color. This technique allows for the identification of small surface defects and variations in material properties that may not be detectable through ultrasonic methods alone. The combination of these two technologies enhances the overall assessment process, providing a more comprehensive understanding of the material’s performance. Integrating ultrasonic and optical defectoscopy can significantly improve the reliability of inspections in civil engineering projects at the laboratory photomechaic modeling stage (because early detection of material defects can prevent costly failures and extend the lifespan of structures). This synergy enables engineers to detect a wider range of defects, leading to more informed decision-making regarding maintenance and repairs.
Survey on Disease for the Dam of a Landscape Lake and Corresponding Countermeasures
Authors: Gao Shangrong , Gu Sha , Guo Daoran , Guo Jian , Xie Feng , Sun Hao
Published: December 2024

Taking a landscape lake in northwest China as the study object, this paper is to find out the main types of landscape lake dam diseases and corresponding damage mechanisms, finally provide a basis for comprehensive improvement. Through the collection, sorting and systematic analysis of survey, design and construction data, and in combination with the multi-stage ground survey, this paper analyzed the main dam damage types and scales, evaluated the dam stability status before reinforcement by modeling based on dam seepage and stability data before and after reinforcement, and tested the effectiveness of reinforcement measures, and concluded the followings through qualitative and quantitative comprehensive analysis: (1) The maximum leakage currently measured is 348.0 m3/d, which is caused by the low viscosity of the local chicken-nest-shaped silt lens at the right abutment and of the dam material, and this is proved by the current conditions of survey, construction and downstream dam slope overflow points, so seepage prevention treatment is comprehensive and systematic, with focus on the right dam abutment, and double rows of mixing piles are arranged in other parts to the dam trench bottom + 15 m curtain grouting. (2) The fluid-solid coupling stability coefficient of downstream dam slope is 1.23 before treatment, less than the engineering stability standard 1.25, and 1.37 after treatment, greater than the engineering stability standard 1.25, which proves that the reinforcement measures are systematic, comprehensive and effective in improving and upgrading seepage stability and dam slope stability. After treatment, it is necessary to strengthen monitoring, to accumulate experience for regional water storage, and also for the mid-and-long term safe operation of this project.
Numerical Simulation and Analytical Calculation of Leakage in a Plain Reservoir in Xinjiang
Authors: Wang Bolei , Li Zheng , Zhang Wenjiang , Gu Meijie , Teng Xiaomin , Li Wanglin
Published: December 2024

With the appearance of plain reservoirs, the geomembrane seepage control system for the reservoir bottom and its periphery has become the main seepage control measure for many plain reservoirs. Reservoir operation period geomembrane defects seepage situations become priority issues, this paper takes a plain reservoir in Xinjiang as an example of two-dimensional and three-dimensional geomembrane defects seepage numerical simulation, analyze different reservoir level under the defects seepage situation, the results show that: (1) When the geomembrane in the reservoir area is complete, the annual leakage of the two-dimensional seepage simulation under various reservoir water levels is 21%∼27% higher than that of three-dimensional simulation, and the maximum seepage gradient of dam foundation is 1.8∼4.2 times that of the three-dimensional simulation. (2) When there are 26 10 mm defects per 10000 m2 geomembrane, the annual leakage of two-dimensional seepage simulation at different reservoir levels is about 15%∼37% higher than three-dimensional simulation, and the maximum seepage gradient drop at the dam base is about 1.5∼1.6 times higher than three-dimensional simulation. (3) Since two-dimensional seepage simulation data is relatively high also favors safety, which can be used as a preliminary estimate of the annual seepage of the reservoir and provide ideas for the geomembrane seepage simulation of the plain reservoirs.
Three-Dimensional Numerical Simulation of Reservoir Plate Settlement in Dam Area
Authors: Luo Huiheng , Jin Heping , Zhang Xu
Published: December 2024

Based o+n the super-large power project in southwest China, this paper focuses on the general laws of reservoir basin settlement, vertical deformation of downstream valley, valley deformation and dam structure deformation. By establishing a regional true 3D simulation model, we analyzed the overall distribution of vertical settlement near the dam area and the spatial distribution characteristics of settlement deformation in different sections. The characteristic measuring points of rock mass are arranged near the dam area on the left and right banks, and the real-time monitoring and analysis of the simulation process are carried out. The vertical settlement law and development trend of the measuring points at different elevations on the left and right banks of the plunge pool are compared. At the same time, aiming at the reservoir disc, the radial deformation and settlement of different sections and the settlement speed law of different sections of the reservoir disc are analyzed. The research results can provide reference for deformation monitoring and safety design of related large power projects.
Analysis of Runoff Reduction Effects Under Different Rainfall Intensities
Authors: Cai Qingchi , Lin Jenyang
Published: December 2024

Runoff analysis is an important part of urban water management. To understand the effects of different rainfall intensities on urban surface runoff, we propose a simulation study of urban areas using rainfall events with different return periods. In this study, the west campus of the National Taipei University of Technology is used to investigate the runoff reduction effect under different rainfall intensities. Different rainfall intensities for 2 years, 5 years, 10 years, 50 years, and 100 years of return period were used in this study. SWMM model was adopted as a tool for the study. The results showed that the runoff reduction rate decreases gradually with increasing rainfall intensity. For low intensity rainfall events, runoff reduction rates can be as high as 70%. However, for higher-intensity rainfall, the runoff reduction rate was even lower than 50%. Peak runoff flow increases with rainfall intensity. For rainfall events with low rainfall intensity, LID facilities can be a good way to cut down the peak runoff flow rate.
Validation of Satellite Information for Use in Hydrological Studies Under a Climate Change Scenario: Case in the Camana River Basin, Peru
Authors: Giovene Perez Campomanes , Carlos Alvarado Mendoza , Maria Perez Campomanes , Nabilt Moggiano Aburto , Carlos Cacciuttolo
Published: December 2024

In the current climate change scenario, there is a shortage in the quantity and quality of rainfall information available in the basins. Satellite pluviometric information emerges as an alternative to carry out more detailed hydrological studies. The objective of this research is to validate satellite information of daily and monthly reticulated rainfall data for the period 1981–2014 in the Camaná river basin, Arequipa region, Peru, compared with rainfall information measured at 23 pluviometric stations of the National Service of Meteorology and Hydrology of Peru (SENAMHI). The methodology used 5 statistical methods for the validation of the precipitation data: (i) Mean Absolute Error, (ii) Mean Squared Error, (iii) Percentage Bias, (iv) Nash-Sutcliffe Efficiency Criterion (NSE), and (v) Pearson’s Correlation Coefficient (R2). Considering two time series cases: (i) The first case considers total time series including two extreme El Niño events (1982–1983 and 1997–1998), and (ii) the second case does not consider total time series, excluding two extreme El Niño events (1982–1983 and 1997–1998). The results indicate an adequate validation of the satellite pluviometric information by applying the Nash-Sutcliffe Efficiency (NSE) criterion considering daily and monthly information. Finally, the article concludes that for future hydrological studies in the Camana river basin, it is possible to use satellite information from gridded data, but carefully analyzing its application considering the climate change scenario.
Research on the Application of Fluid-Consolidated Soil in Cavern Treatment
Authors: Qiu Yunjun , Li Jichao , Liu Chengzhe , Cheng Lei , Zhao Jingxing , Ben Niu , Li Taoran
Published: December 2024

In many tunnel construction projects, due to the neglect of the impact of the cavern on the stability of the tunnel, the cavern treatment measures are not rigorous, resulting in the tunnel construction often triggered by several engineering accidents, such as ground subsidence, tunnel roof fall, construction machinery fall, etc., to the construction of the project has brought about substantial economic losses, and a severe threat to the construction workers and the lives of nearby residents. The emergence of cured soil provides a new idea for karst treatment. Fluid-curing soil is directly mixed with a certain proportion of special mud-curing agents in the engineering waste mud. After being mixed by machinery, the self-leveling, self-compacting, and pouring-type engineering materials that mud pumps can transport are formed. Waste soil can also mix water into the slurry to prepare fluid-curing soil to achieve the purpose of waste utilization, carbon sequestration, and environmental protection. The current stage of karst treatment methods is summarized and proposed. Concrete filling and high-performance fluid curing soil treatment using cavern treatment technology will be successfully applied to the Shenzhen Intercity railway Tunnel, a section of the cavern treatment.
Reliability Analysis of Anti-Liquefaction of Hydraulic Sand Fill Based on CPT
Authors: Quan Xiaojuan , Fang Ming , Ding Jihui , Cao Xugang
Published: December 2024

The mathematical model and calculation parameters of the Anti-liquefaction of the hydraulic sand fill are stochastic. If these variables are ignored, the risk of engineering problems will be underestimated to some extent. Based on the static cone penetration test (CPT), a calculation model for the Anti-liquefaction of the sand is established in this paper. The influence of the basic random variables in this model, including fine particle content Fc, seismic peak acceleration amax and cone resistance qc, on the liquefaction safety factor are analyzed. Monte-carlo method and Rousenbleuth method are used to calculate the reliability index. The results show that Rosenblueth method can be used to calculate the reliability index of anti-liquefaction of hydraulic fill sand. The influence of fine particle content Fc, cone resistance qc and peak acceleration amax on the reliability index is analyzed. The reliability index decreases significantly with the increase of the coefficient of variation, and the variability of qc has the greatest impact on the reliability index, followed by the fine particle content Fc, and the peak seismic acceleration amax is the least.
Correlation Analysis of Soil Parameters of Typical Soil Layer Derive from Pressuremeter and Standard Penetration Test
Authors: Ma Xiaoyun , Meng Xinyi , Li Shang , Ding Jihui
Published: December 2024

The Pressuremeter Test (PMT) and Standard Penetration Test (SPT) are two important in-situ testing techniques that can objectively reflect the strength and deformation characteristics of soil layers. Establishing regional correlations between soil parameters from PMT and SPT is of great significance in providing reference values for indicators of soil related mechanical properties. Based on drilling data from a new district in Nanjing, this article conducted a statistical analysis of the main physical and mechanical parameters of typical soil layers. The results indicate that there is a good power function relationship between the lateral modulus, horizontal foundation coefficient, and lateral bearing capacity of the soil layer, with a goodness of fit greater than 0.96; There is a linear relationship between the lateral modulus, horizontal subgrade coefficient, lateral bearing capacity, and standard penetration hammer number of soil layers, with a goodness of fit greater than 0.94. The conclusion provides reference for engineering design and scientific research.
Modeling the Response of Friction Pendulum Systems
Authors: Zhelyazov Todor
Published: December 2024

The contribution focuses on the response simulation of friction pendulum seismic isolators during a strong ground motion. The device is considered an isolated structural element. Its action is effectively described as the motion of a particle (i.e., the slider) on a spherical surface (i.e., the sliding surface). The bearing is inherently a system with three degrees of freedom and a Lagrangian formalism is employed to derive its equations of motion. Taking into account that the slider is constrained to move only on the spherical sliding surface, one of the degrees of freedom remains constant when the bearing is activated. Two second-order ordinary differential equations can be consequently derived for the remaining degrees of freedom. The response of the isolator depends strongly on the friction coefficient. The latter doesn’t remain constant, it is assumed to vary with the sliding velocity, the normal pressure acting on the interface, and the rise in the temperature during sliding. The input for the analyses is provided in terms of acceleration time series recorded during a real earthquake. Numerical simulations are performed and results obtained in terms of slider’s trajectories are presented.
Prefabrication Technology of Steel Shell Concrete Immersed Tube in Shenzhen-Zhongshan Link Construction
Authors: Huang Wenhui , Zhang Jiawei , Chen Weibin , Zhang Wensen
Published: December 2024

The sinker tube of Shenzhen-Zhongshan Link Construction is the first large-scale use in China, the widest cross-section span and the largest scale steel shell sinker tube in the world so far. It is filled with high fluidity self-densification concrete. In order to study and solve the technical problems of the prefabrication process of large steel shell sinking tube, this paper studies the prefabrication process selection, steel shell manufacturing and precision control, self-densification concrete preparation, steel shell pipe joint pouring and other aspects. Combined with its special steel shell structure, this paper proposes a complete set of intelligent pouring construction technology for large steel shell sinking tube. The process uses self-compacting concrete combined with intelligent pouring equipment to realize information and intelligent pouring. By using the optimal mix ratio control standard and pouring technology of self-densifying concrete, the test results of precast quality of steel shell submerged tube meet the design requirements and the effect is good, which provides technical support for ensuring the precast quality of steel shell submerged tube.
Study on the Number of Microseismic Sensor Groups for Rockburst Monitoring in Deep Tunnel
Authors: Guo Haosen , Zhang Junhao , Feng Guangliang , Ma Jingang , Li Hongliang , Du Chenghao , Ma Qi
Published: December 2024

The arrangement of microseismic (MS) monitoring sensors can significantly impact the accuracy of source location. Based on the particle swarm algorithm, this paper uses simulation analysis to optimize the number of MS monitoring sensor groups (two rows and three rows) in deep tunnels. The results show that under the condition of a total of 8 sensors, for the randomly generated 200 MS events near the tunnel face, the average localization error of the two-row arrangement is 6.609 m, with an average relative error of 8.26%. The average localization errors of the two types of three-row arrangements are 8.005 m and 7.825 m, with average relative errors of 9.87% and 9.63%, respectively. The localization effect of the two-row arrangement is slightly better than that of the two three-row arrangements, and the localization effect of the two three-row arrangements is close, and the three arrangements can meet the localization requirements of the engineering site. The research results can provide a theoretical and technical reference for the optimal arrangement of the MS monitoring sensor for tunnel rockburst.
Experimental Study on Contact Mechanical Properties of Grain Granules
Authors: Yang Pengfei , Zhang Shengli , Guo Qiang
Published: December 2024

The stress-strain characteristics and strength failure characteristics of soybean granules were analyzed by triaxial tests under different confining pressures (50 kPa, 100 kPa, 150 kPa, 200 kPa and 250 kPa). The test results showed that the peak strength of soybean samples increased with the increase of confining pressure. After loading, the sample is drum-like and has a certain tilt Angle, and the tilt Angle and direction of different samples are different. This uncertainty and irregularity of shear deformation is more obvious at low confining pressure. According to its characteristics, the stress-strain curve of soybean bulk triaxial compression test can be divided into four stages: compaction, linear elasticity, nonlinear and post-peak strain softening. The larger the confining pressure, the more obvious the compaction process, while the smaller the confining pressure, the more obvious the strain softening phenomenon. The shear failure of soybean particles approximately follows the Mohr-Coulomb failure criterion, and the cohesive force and internal friction Angle of coarse-grained soil are obtained by using the Mohr-circle envelope method, which are 11.3 kPa and 33.06° respectively.
Modeling the Impact of Climate Factors on Pavement Roads Using System Dynamics
Authors: Bolouri Farhad , Tokdemir Ömer , Alas Mustafa
Published: December 2024

An important factor affecting the residents’ quality of life is the condition of the city’s roads. One of the community’s essential necessities is to paving and maintaining urban roads since this allows for the safe, timely, and comfortable movement of people and commodities. On this basis, for municipalities and highway engineers, determining the effects of different elements on pavement design, construction, and maintenance is their key responsibility. This study examined the impact of four climatic factors – rain, snow, solar radiation, and wind on the in-service performance of pavements. In this study, system dynamics along with causal and effect diagrams were employed. The reinforcing loops for each of the mentioned factors were analyzed, and recommendations were provided. The recommendations included: 1) optimizing the design of hot mix asphalt (HMA), 2) incorporating additive materials in pavement design, and 3) factoring in climatic conditions during the design and construction of pavement roads.
Study of the Performance of a Crashworthy Device Under Vessel Collision
Authors: Luo Tingyi , Tao Liang , Tang Yasen
Published: December 2024

Bridge failures are primarily associated with floods and collisions, underscoring the critical need for the implementation of crashworthy devices designed to mitigate the impact of vessel collisions and reduce bridge damage. This study introduces a novel crashworthy device termed the Steel-clad Composite Material Crashworthy Device. The impact performance of the crashworthy device is evaluated based on finite element method. The findings underscore the effectiveness of this device, revealing a substantial reduction, approximately 30% to 40%, in the peak impact force when the device is installed, particularly in scenarios involving high impact velocities. For Example, when the vessel tonnage is 6000 DWT, under a 4.5 m/s speed impact, the peak impact force with anti-collision facilities is 28.62 MN, whereas without anti-collision facilities, the peak impact force reaches 44.3 MN, representing a reduction of about 35.4%. The designed crashworthy device serves as a valuable tool for enhancing the impact resilience of a bridge when subjected to vessel collisions.