Article
Chemistry, Multidisciplinary
Ali Reza Ghanizadeh, Ali Delaram, Pouyan Fakharian, Danial Jahed Armaghani
Summary: The collapse settlement and coefficient of stress release of sandy gravel soil can be predicted using an evolutionary polynomial regression model. The models developed with exponential functions showed the best performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Ch. Sowjanya, S. K. Pratihar
Summary: The electrical transport properties of La0.5Sr0.5Co0.2-xAlxFe0.8O3-delta(x = 0 - 0.2) perovskite oxides were thoroughly studied, showing that the crystal structure remained rhombohedral regardless of substitution level. X-ray photoelectron spectroscopy (XPS) was used to estimate the changes in surface-active oxygen vacancy concentration. Samples sintered at a particular schedule demonstrated that grain size decreases with increasing substitution level. Samples with aluminum substitution level x = 0.10 exhibited the highest D-chem and K-chem values, making them suitable for oxygen gas separation applications at 850 degrees C.
Article
Engineering, Geological
Zhang Jin-xun, Song Yong-wei, Yang Hao, Zhang Lei, Qi Yi
Summary: This study focuses on the frost heave and thawing characteristics of the typical saturated sandy gravel stratum in Beijing under different fine soil contents and load conditions. The results indicate that there is a significant shrinkage phase during the initial freezing stage of saturated sandy gravel under loading conditions, with a shrinkage of 0.053% of the specimen height. The frost heave ratio and thawing settlement coefficient both show an exponential correlation with time. The study also reveals that the fine soil content and load have significant effects on the thawing settlement coefficient and frost heave ratio of saturated sandy gravel.
ROCK AND SOIL MECHANICS
(2022)
Article
Thermodynamics
Ubong W. Robert, Sunday E. Etuk, Okechukwu E. Agbasi, Uduakobong S. Okorie
Summary: Various potential thermal insulators are fabricated for applications, but drawbacks like selectivity, availability, and cost hinder progress. A modified apparatus reduces steady-state duration and determines thermal conductivity of insulators up to about 9.0 mm thickness, meeting conditions for test acceptability.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2021)
Article
Acoustics
Karthik Nagabhushana, Qiuyu Wang, Aiguo Han
Summary: This paper proposes a pulse-echo approach to compensate for membrane transmission loss and simplify the measurement of the attenuation coefficient (AC) of reference phantoms. The method was validated through simulations and experiments, demonstrating satisfactory accuracy and repeatability.
JOURNAL OF ULTRASOUND IN MEDICINE
(2023)
Article
Materials Science, Ceramics
Lav Kush, Sanjay Srivastava, Sanjay Kumar Vajpai, Serguei V. V. Savilov
Summary: The thermoelectric properties of a new type of Pr2-xSrxFeCrO6 double perovskite were investigated at higher temperature after its sol-gel synthesis. The XRD results validate the single-phase orthorhombic structure, and the crystallite sizes meet the morphological measurements. XPS examination confirmed the varied oxidation states of constituents and the presence of defect sites in these oxides. The PrSrFeCrO6 compound had the maximum ZT (0.105), which was 3.9 times higher than that of the pristine compound.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2023)
Article
Polymer Science
A. N. U. Singh, P. K. Dutta
Summary: The experiment aimed to study the microsphere of the chitin-glucan complex, with the formation of spherical ChGMS through spray drying. SEM and particle size analysis revealed that the particles were amorphous and ranged in size from 1.5 to 3.5 μm. The antibacterial properties of the chitin-glucan microsphere loaded with ciprofloxacin were improved, showing stronger inhibition of bacterial growth compared to the chitin-glucan solution, with the antibacterial activity also dependent on the size of the microsphere.
JOURNAL OF POLYMER MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
S. Esakki Rajavel, T. Aruna, G. Rajakumar
Summary: The cognitive radio sensor network (CRSN) aims to minimize energy consumption in channel sensing and switching for 6G applications using the KMCT technique. It optimizes energy utilization in data emissions and reduces energy consumption during data transmission.
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
(2021)
Article
Engineering, Environmental
Magda Mohamed, Huda Kamal Soussa, Nagy Aly Hassan, Talaat Tahir ElGamal
Summary: This study used remote sensing techniques to calculate water consumption in El-Bostan irrigation district. Crop coefficients and reference evapotranspiration values were calculated from remote sensing data and verified with field measurements, showing the importance and reliability of remote sensing techniques in calculating water consumption values, which can improve water management and efficiency.
Article
Optics
Yang Yang, Li Gang, Jing Kewu, Wang Tianqi, Peng Saiao, Yao Tingting, Chen Shuyong
Summary: The radio frequency power significantly influences the formation and crystallinity of ZnS thin films, with increased power enhancing the crystallinity but leading to a decrease in optical band gap. An optimal radio frequency power of 150W is ideal for the growth of highly crystalline ZnS films.
ACTA PHOTONICA SINICA
(2021)
Article
Materials Science, Multidisciplinary
Jun-Gao Zhu, Ming-Jie Jiang, Yang-Yang Lu, Wan-Li Guo, Bo Zhang
Article
Construction & Building Technology
Ming-Jie Jiang, Jun-Gao Zhu, En-ye Ji, Ying-qi Wei, Zhi-zhou Geng
ADVANCES IN CIVIL ENGINEERING
(2018)
Article
Materials Science, Multidisciplinary
Wan-Li Guo, Zheng-Yin Cai, Ying-Li Wu, Zhi-Zhou Geng
ACTA MECHANICA SOLIDA SINICA
(2019)
Article
Engineering, Civil
Wanli Guo, Yinghao Huang, Andy Fourie, Yingli Wu
Summary: A mathematical model reflecting the evolution of both particle breakage and particle-size distribution for rockfill subjected to triaxial shear has been proposed and verified in this study. The relationships between particle breakage, PSD, and stress state of rockfill were established, providing what is termed the PSD evolution model. Additionally, the model successfully predicted the particle breakage factors and PSDs of rockfill triaxial specimens.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Wan-Li Guo, Jun-Gao Zhu, Sheng-Shui Chen, Ting Yu
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
(2019)
Article
Engineering, Civil
Erlu Wu, Jungao Zhu, Wanli Guo, Zongliang Zhang
KSCE JOURNAL OF CIVIL ENGINEERING
(2020)
Article
Engineering, Civil
Wan-Li Guo, Zheng-Yin Cai, Ying-Li Wu, Chen Zhang, Jun-Jie Wang
Summary: The dilatancy equation plays a significant role in establishing an elastoplastic constitutive model for soils. A new dilatancy equation incorporating strain hardening and strain softening for rockfill materials was studied, and its applicability was verified through triaxial compression tests.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Environmental
Wanli Guo, Ge Chen, Junjie Wang, Fuxian Jian
Summary: The plastic potential and yield functions are vital components of elastoplastic constitutive models. This study proposes a unified function to define the yield and plastic potential surfaces for rockfills, and experimental results validate the reasonableness of this function.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Materials Science, Multidisciplinary
Guo Wanli, Cai Zhengyin
Summary: This study conducted laboratory tests on Gobi sand, a commonly used soil material in China, and discovered its unique physical behaviors and critical state behaviors. Gobi sand exhibits low permeability coefficient, sticky behavior after moisturization, and shows significant differences in critical state behaviors compared to other sandy soils. Unified critical state equations for Gobi sand were proposed to describe the effects of different pressure conditions and initial void ratios on its behavior. The composite mineral composition of Gobi sand is believed to play a significant role in these unique behaviors.
Article
Engineering, Geological
Wan-li Guo, Ge Chen
Summary: This paper investigates particle breakage in rockfill during shearing. By using a reduction strategy for the friction coefficient, a method to estimate the breakage energy is developed. The results show that the particle breakage indices and fractal dimension are proportional to the breakage energy.
Article
Environmental Sciences
Fu-xian Jian, Zheng-yin Cai, Wan-li Guo
Summary: Investigating the material distribution characteristics during sliding and depositing is crucial in understanding the internal structure and spatial variation of landslide dams, and their influence on mechanical and hydraulic behavior, as well as the susceptibility to dam failure. However, observing these characteristics and their formation mechanisms in the field is difficult due to time and geographical constraints. Therefore, this study developed an experimental apparatus to model a landslide dam, and analyzed the internal deposit characteristics, void ratio variation, and relative content of the particle size range. The results showed that the deposited granular material exhibited an inverse grain size accumulation structure in both vertical and horizontal directions, with spatial variability in particle gradation and void ratio.
JOURNAL OF MOUNTAIN SCIENCE
(2023)
Article
Engineering, Environmental
Chen Ge, Jungao Zhu, He Kun, Congyong Ran, Wanli Guo
Summary: In this study, a simple model for describing the creep behavior of soft clays is proposed, based on an updated deviatoric creep equation. The model effectively predicts the creep deformation of soft clays by considering the strain-time curves and the relationship between deviatoric creep strain and time. Moreover, it demonstrates a more general applicability than the Singh-Mitchell model.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)