bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of Soil-Structure Interaction for Different RC Structural Systems and Foundation Sizes
Authors: Bapir Baban , Abrahamczyk Lars , Afroz Ayesha 
Published: June 2024

Abstract
Past earthquakes and contemporary research reveal that dynamic soil-structure interaction (SSI) could significantly alter the structural response of a building during an earthquake. These effects are functions of several parameters, including structural system, foundation type and geotechnical characteristics of the subsoil. Previous studies discovered that SSI effects are more prominent for structures supported by shallow foundations. However, increasing the foundation size for high-rise buildings tends to decrease the SSI effects in lateral deflections and foundation rocking. Further, the structural response of wall-frame structures differs from Moment-Resisting Frame (MRF) structural system. The present article extends earlier findings to investigate the influences of shallow foundation size on the seismic response of short and medium heights of reinforced concrete buildings resting on soft soil deposits. In addition, the inertial soil-structure interaction effects on MRF and wall-frame systems are studied and compared. A nonlinear Winkler foundation model (BNWF) is adopted to represent the soil domain. The model allows accounting for plastic deformation in the subsoil and considers the soil damping. The structural elements are modelled based on distributed plasticity mechanism to capture the inelastic response of the structures. A 3-storey, 6-storey and 12-storey building with various foundation sizes and different structural systems are numerically simulated in OpenSees software. The buildings are subjected to five moderate earthquake records for time history analysis in the time domain. The results are expressed in terms of period lengthening, lateral deflection, inter-storey drift, and base shear forces. The results reveal a noticeable influence of foundation size on dynamic characteristics and seismic response of MRF structures. Increasing foundation length decreases the structures’ lateral deflection and base shear forces. However, these effects are less observable for the short-height structure. On the other hand, the wall-frame system is relatively more influenced by SSI effects than the MRF system. The effects of period elongation and increasing base shear forces due to SSI are more noticeable for wall-frame systems, and these effects are maximum for stiffer structures. Similarly, the increase in maximum lateral displacement and storey drift is higher in wall-frame buildings compared to MRF structures, particularly in the lower stories of the building.
An equivalent modeling method for coupling stiffness of metal braided sleeve based on hyper-elastic material function
Authors: Jianrun Zhang , Xinran Chen , Dacheng Huang 
Published: June 2024

Abstract
Metal hoses are important connecting components in pipelines, used for compensation in length and vibration reduction in system. Due to the complex structure of the metal braided sleeve on the outer layer of the metal hose and the nonlinear stiffness caused by coupling with the metal corrugated pipe during the combination process, modeling and calculation are difficult. In this paper, an equivalent modeling method for the coupling stiffness of metal braided sleeve based on Hyper-elastic material function is proposed. The parameters of Hyper-elastic material function are obtained through experiments. Experiments and simulations show that this method has a high accuracy, which propose an efficient way to solve the problems in theoretical analysis and simulation modeling of metal hose.
Design and Modelling of a Centrifugal Pump Using Autodesk Inventor Professional
Authors: Ngcukayitobi Miniyenkosi 
Published: June 2024

Abstract
Centrifugal pumps find wide-ranging applications across various fields, yet the majority of these pumps continue to be produced using conventional manufacturing methods. These methods involve processes such as milling, cutting, and drilling, which, while effective, are less inclined towards achieving energy, environmental, and economic sustainability. This has spurred researchers to explore innovative approaches to enhance the sustainability of production processes. One notable advantage of 3D printing lies in its capacity for rapid prototyping. This term denotes the ability to swiftly fabricate, design, and evaluate a bespoke component in the shortest possible time. The driving force behind this research endeavor is to furnish comprehensive guidance on the design and modelling of a centrifugal pump utilizing Autodesk Inventor Professional software. To ensure synchronized operation, a coupling unit was employed to link the pump and motor shafts, ensuring they rotate at identical speeds and within the same plane. This unit plays a critical role in transmitting both speed and torque. The modelling of the impeller, the pivotal component of the centrifugal pump, entailed the following steps: creating a model for the lower flared section, fashioning the upper flared part, shaping the impeller blades, generating a circular series of blades to yield the remaining seven, designing a reinforcement solid for secure attachment to the axis, sculpting the lower wear ring, and fashioning the central aperture to accommodate the rotating shaft.
A Study on the Effects of Clearance Joints on the Dynamic Response of a Planar Deployable Structure
Authors: Yao Huaibo , Liang Lei , Ma Wenlai , Zhao Yang 
Published: June 2024

Abstract
This article investigates the influence of clearance joints on the dynamic characteristics of deployable structures and the contact characteristics inside clearance joints. An explicit dynamic modeling method is employed to formulate the governing equation of the structure, integrating the contact forces. Initially, a planar deployable structure is subjected to analysis to discern the effects of clearance joints. Subsequently, two distinct dynamic analyses are meticulously conducted to discern the nuanced effects of clearance size. The outcomes offer conclusive insights; clearance joints substantially influence dynamic responses and prolong the structure’s vibration period. The unrestrained motion of joints contributes to increased kinetic energy within the structure. Furthermore, a larger clearance size exacerbates these effects. In conclusion, the findings underscore the significant effects on the structure’s dynamic characteristics, which should be seriously taken into consideration in the design and modeling process. This necessitates meticulous consideration in designing and analyzing high-precision space structures to ensure accurate predictions and optimal performance.
Effect of Maglev Suspension on the Aerodynamics of Multiple Vehicles Moving in a Low-Pressure Tube
Authors: Alzhrani Seraj , Abdulla Mohammed , Juhany Khalid A , AlQadi Ibraheem 
Published: June 2024

Abstract
The concept of high-speed vehicles traveling in a low-pressure closed system has attracted global attention as an innovative, efficient, and safe mode of transport. So far, most the studies on Hyperloop aerodynamics has considered a single vehicle moving in a confined space, but limited work has been devoted to the succession of vehicles system. This paper deals with the analysis of vehicle suspension gap for multiple vehicles system running in a low-pressure environment. The vehicle’s system is traveling at Mach number = 0.7 in a low operating pressure of 10,000 Pa and blockage ratio of 0.36. Each vehicle is equipped with a compressor and jet exit to provide the thrust force. Three running vehicles at various vehicle-to-vehicle distances, Xv (0.25, 0.5, 1, 2Lv), were numerically investigated using RANS. The analysis was carried out at a gap distance of 75 mm. The obtained results showed that the suspension gap significantly impacts the aerodynamic performance of the entire system. The flow structure behind each vehicle was investigated, and its influence on thrust was presented. It was observed that the drag on the trailing vehicle is approximately six times the drag on the leading vehicle. The high drag on the trailing vehicle is attributed to the development of shock waves at its rear part.
Structural and Optical Characterization of Dual Phased AlScN Thin Film Co-Sputtered on Sapphire
Authors: Ahmad Ateed , James Raju K C 
Published: June 2024

Abstract
In the present report, the structural and optical characteristics of RF sputtered Al52Sc48N (ASN) was studied with X-ray diffraction (XRD), Raman spectroscopy and UV-Vis reflection spectroscopy. XRD spectra shows three distinct peaks at 35.31˚, 40.80˚ and 59.32˚ of which two of them belong to cubic phase while one of them suggest a hexagonal structure. The Raman spectra show some unusual broadening of the peaks with a huge redshift. The addition of Sc has induced a great amount of strain in ASN which is reflected in the redshift of Raman peaks, smaller grain size calculated by Scherrer equation and micro cracks observed in FESEM images. The reflectivity spectra show interference fringe pattern at higher wavelength with the pattern diminishing gradually as the bandgap threshold approaches. An abrupt drop in reflection around 254 nm is observed which is believed to be of Surface Plasmon Resonance of Al. The refractive index was calculated using envelope method and it shows a typical inverse behaviour with respect to the wavelength. The thickness of the film as calculated by cross sectional SEM image is almost similar to that calculated using envelope method of UV-Vis reflection spectra.
Synthesis, Properties, and Structural Studies of Bismuth-Barium Tellurite Glasses Doped with Dy2O3
Authors: Mujeeb Syed , Eraiah B 
Published: June 2024

Abstract
A series of a new glass sample has been prepared with glass composition xDy2O3-(10-x) Bi2O3-20BaO-70TeO2 (where x=0,1,2,3,4,5, and 6 and mol %) have been produced through the traditional melt-quenching approach. The XRD (“X-Ray Diffraction”) pattern indicates that the glass system is amorphous by nature. The prepared glass system’s density has been examined with Archimedes’ principle, and the associated molar volume was estimated. Dy2O3 increases the density of the glass system, and it is observed that the molar volume is inversely related to the glass density. The absorption spectra from the wavelength range 200nm – 1100nm are applied to assess the glass’s optical properties. The direct and indirect optical band gap were computed using Tauc’s plots from the absorption spectra. The energy gap variation with the concentration of Dy2O3 has been discussed. The refractive index has also been calculated using the energy band gap values. Other physical parameters like electronic polarizability, and dielectric constant molar volume have been calculated. The structural and optical properties were examined via FTIR and RAMAN spectrometers.
Analysing CMOS performance: A comprehensive study of operational characteristics in low-temperature environments
Authors: Cui Chuanjie 
Published: June 2024

Abstract
This article aims to methodically analyse and consolidate the experimental findings from previous research on the operational behaviour of Complementary Metal-Oxide-Semiconductor (CMOS) technology in low-temperature conditions. Recognizing the extensive array of empirical data available, the focus is on delineating and systematizing the functional attributes of CMOS devices when subjected to such environmental parameters. The study involves a comparative review of diverse scholarly sources, identifying and categorizing the operational features of CMOS in low-temperature scenarios. This endeavour seeks to distil these findings into clear, initial conclusions, drawing upon a comprehensive examination of relevant literature and database compilations. Structurally, the paper commences with an introductory exposition on CMOS, followed by a detailed literature review cantered on its performance in low-temperature contexts, leading to the analysis of collected data and ensuing discussions. The synthesis of these insights aims to enhance the understanding and generalization of CMOS operational dynamics in low-temperature environments, contributing to a cohesive body of knowledge in this specialized field.
Research progress on piezoelectric acoustic transducers: Principles, materials, performance, and applications
Authors: Zhu Jishen 
Published: June 2024

Abstract
Piezoelectric acoustic transducers enable the mutual conversion between mechanical energy and electrical energy. In recent years, piezoelectric transducers, as efficient and reliable sustainable energy harvesting devices, have demonstrated unique application value in various disciplines such as physics, acoustics, and engineering. This paper comprehensively reviews the current research status and future development directions of acoustic transducers. Firstly, the physical mechanism of the piezoelectric effect is thoroughly analyzed, and the basic operating mode of piezoelectric acoustic transducers is systematically explained. Furthermore, the characteristics and design directions of different types of piezoelectric materials are comprehensively reviewed, with a focus on exploring material innovation approaches to enhance performance. Moreover, various design methods, including layered, integrated, and curved structures, are summarized with emphasis on their crucial roles in improving sensitivity and adaptability. Techniques improving performance were also reviewed. Given the unique nature of piezoelectric effect, the research outlines applications of transducers in sonar systems, structural monitoring systems, and micro-piezoelectric systems. Through the above review, this paper provides profound insights into the research on piezoelectric acoustic transducers, emphasizing in-depth investigations in specific areas. It offers researchers from backgrounds including materials science, acoustics, and electronics different directions, ideas, and methods, thereby promoting innovation in wireless, sensing, and energy fields.
Design remote wireless sensor node solar power fire detection system to prevent high temperature’s fire
Authors: Wu Zheyu 
Published: June 2024

Abstract
This paper introduces a basic remote wireless sensor node solar power fire detection system model. It aims at the design and analysis of a closed-loop converter circuit aimed at voltage regulation within the range of 2V to 5V. The circuit employs a microcontroller for the purpose of maintaining a stable output voltage of 9V. Efficiency testing has been conducted to quantify input and output voltages as well as currents, yielding efficiency curves across various load resistor values, all surpassing the 70% threshold. The circuit has been tailored for optimizing battery charging and discharging processes and incorporates a sleep system to enhance the longevity of the wireless sensor node. Furthermore, the integration of temperature sensors is thoroughly discussed. In conclusion, this study displays the successful creation of wireless sensor nodes featuring efficient voltage regulation and extended battery life.
Design of 1000-1100nm fiber laser based on neodymium ion
Authors: Liu Yuan 
Published: June 2024

Abstract
Nd3+ ions have a large emission cross-section in the 1000 ∼ 1100 nm band. In this study, we focus on the spectral properties of Nd3+ ions, simulate the power transfer equation of the Nd-doped ion fiber laser. The design of the Nd-doped fiber laser is aimed at laser generation by considering parameters such as absorption cross section, particle number concentration, loss coefficient, and reflectivity of the front and rear cavity mirrors. The experimental process begins with the design of specific parameters for the two cavity mirrors at 1060 nm using Matlab, based on the required reflectivity parameters. The simulation demonstrates that laser generation begins at a pump light power of 9.8 W, and the laser power reaches 36.8 W. Observe the propagation power of the signal light and pump light, when the pump light propagates in the forward direction, the forward propagation power of the pump light will decrease. This paper summarizes and innovates the numerical simulation parameters of Nd-doped ion fiber laser. The specific innovations are reflected in the proposed new emission cross section of pump light and absorption cross section of signal light, as well as the novel mathematical model for designing the front cavity mirror and the back cavity mirror. The experiments provide better data support for the preparation of 1000 ∼ 1100 nm doped Nd-doped fiber lasers.
In praise of cooking gas subsidies: transitional fuels to advance health and equity
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Authors: Gould Carlos F , Bailis Rob , Balakrishnan Kalpana , Burke Marshall , Espinoza Sebastián , Mehta Sumi , Schlesinger Samuel B , Suarez-Lopez José R , Pillarisetti Ajay 
Published: June 2024

Abstract
Households that burn biomass in inefficient open fires—a practice that results in $1.6 trillion in global damages from health impacts and climate-altering emissions yearly—are often unable to access cleaner alternatives, like gas, which is widely available but unaffordable, or electricity, which is unattainable for many due to insufficient supply and reliability of electricity services. Governments are often reluctant to make gas affordable. We argue that condemnation of all fossil fuel subsidies is short-sighted and does not adequately consider subsidizing gas for cooking as a potential strategy to improve public health and reduce greenhouse gas emissions.
Influence of fieldwork in geo-education
Authors: Nam Nguyen Thi Que , Hieu Nguyen Thi Le , Chi Hoang Thi Phuong 
Published: June 2024

Abstract
Fieldwork is an indispensable method in geo-education which provides young people with a fundamental understanding of how the human and natural world work. However, fieldwork in the curriculum is gradually being reduced due to a few reasons such as risks, sickness, expense, and effectiveness. Therefore, a study was conducted to clarify the influence of fieldwork on three aspects of students: knowledge, skills, and attitudes through a survey of 112 students from 2 groups that participated in different number of field trips: a one-trip group and a more-than-two-trip group. Hierarchical cluster analysis also classified five clusters of attitudes about field trips: Addict, Explorer, Acceptor, Non-fan, and Skeptic. However, Mann-Whitney test found that there was not significantly different between the two groups of student experienced different numbers of field trips and cluster of attitudes. The analysis results show that there are statistically significant differences between the two groups of students in several aspects of knowledge and skills. To make fieldwork more effective, the study proposes to have more informative surveys, more research subjects such as field teachers, staff; thereby making appropriate adjustments to meet the outcome of the course and the development of geo-education in modern world.
Aquatic invertebrates and their correlation with the basic abiotic factors in the coastal water of Can Gio, Southern Vietnam
Authors: Pham A D , Dao T S 
Published: June 2024

Abstract
Macroinvertebrates metrics are reliable indicators to assess the environmental quality and ecological health. In water systems, estuarine areas are sinks and sources of nutrients and pollutants, and strongly influenced by anthropogenic activities and emission from inland. Benthic macroinvertebrates and zooplankton living in estuary and coastal are not very active organisms hence heavily impacted by surrounding environmental conditions. In this study, we assessed the water quality at the tropical coastal of Can Gio located in Southern Vietnam, based on the aquatic invertebrates and environmental variables. The organisms were monitored at 20 sampling sites along the Can Gio coastal in November 2021, April, June and August 2022. Totally, 45 invertebrate species were recorded in the Can Gio coastal. The zooplankton and benthic macroinvertebrate abundance, respectively, varied between 900 to 13,000 individuals/m3, and ranged from 30 to 120 individuals/m2. The copepods and polychaetes were dominant in both species number and abundance of the zooplankton and benthic macroinvertebrates, respectively. The water quality at the Can Gio coastal during the monitored period was from low pollution to high-moderate pollution based on the invertebrate structure, abundance and indices. The results also showed the correlation between environmental variables (e.g., turbidity and dissolved oxygen) and species richness and abundance of aquatic invertebrates. Our study revealed the important and valuable application of aquatic invertebrates for the environmental quality monitoring to protect the border of the most mangrove biosphere reserve in Vietnam.
Study on COD and color removal efficiency in textile dyeing wastewater by iron electro-coagulation technology combined with persulfate
Authors: Nam Ngo Thi Phuong , Cuong Nguyen Ngoc , Trung Le Duc 
Published: June 2024

Abstract
Electrocoagulation (EC) is an attractive method for treating many types of wastewater due to its advantages. The purpose of this study is to investigate the effect of persulfate addition on the efficiency of textile wastewater treatment through the removal percentage of COD and color parameters. Persulfate is proven to significantly enhance the rate and efficiency of pollutant removal in textile wastewater. The removal percentage of COD could reach 91.33 ± 1.23% and 97.99% ± 0.52% was the highest removal percentage of the color parameter at the optimal reaction parameters. The effluent concentration meets the standards according to Vietnam national technical regulation on textile industry wastewater. By using persulfate, the COD and color removal efficiency increased by 17.53 ± 2.69% and 8.81 ± 0.91%, respectively, compared to the single electrocoagulation process. The amount of sludge generated in the system is 0.542 ± 0.0357 kg/m3, significantly reduced compared to the flocculation process of 0.875 ± 0.0295 kg/m3.
Assessment of awareness, consensus, and willingness to enforce regulations’ household waste separation in Ho Chi Minh City, Vietnam
Authors: Mai Le Thi Tuyet , Thao Do Phuong , Anh Hoang , Hai Pham Viet , Chau Nguyen Lam Hong 
Published: June 2024

Abstract
The amount of household solid waste is increasing seriously in Vietnam, because of population growth, urbanization, and economic growth. Reducing the waste volume liberated to the environment needs community participation and people’s awareness about the waste segregation at sources and hand to reuse and recycling. Realizing the value of waste classification would mobilize residents to classify domestic waste and nurture more residents’ habits. Knowing the factors influencing the individual waste separation intention supports building effective environmental campaigns. By applying the Theory of Planned Behaviour (TPB), this study determined factors correlated with residents’ waste classification intention in Ho Chi Minh City (HCMC), Vietnam. An extension of the TPB model was undertaken. This extension incorporated three additional factors, namely, propaganda, awareness, and consensus about household waste separation regulations to predict individual separation intention in HCMC, Vietnam. With a sample size of 250 residents, SPSS 20.0 software is used to analyze data. This study supports policymakers regarding formulating laws and regulations in terms of raising waste classification intention and community recycling plans.