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Uniaxial mechanical properties and failure characteristics of fractured silty mudstone
Jie Liu,Hualin Zhang,Hanbing Bian,Wei Wen,Ling Zeng 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.1
Cracking behaviour of silty mudstone with existing flaws can trigger slope instability. However, the mechanics of multi-fractured silty mudstone have not been adequately examined. To handle this issue, the study employs a comprehensive approach to investigate the mechanical characteristics and cracking mechanism of fractured silty mudstone combing uniaxial compression test conducted by similar material specimens, cracking strength model, macro damage model, and PFC2D. Similar material specimens containing prefabricated fractures are prepared using steel sheet insertion during curing. Results show that peak strength initially decreases and subsequently increases as the facture dip angle ( ) increases, minimizing at 45° under uniaxial compressive load. The more fracture there exists, the greater reduction in peak strength. The failure morphology of fractured silty mudstone can be categorized into tensile failure, shear failure, and tensile-shear combined failure. Theoretical models confirm that the crack strength depends on and fracture length (a), aligning with experimental results while crack strength exhibit inversely proportional to a. The simulation results are in good correlation with test results, verifying the reliability of the simulated approach combined with theoretical analysis. Overall, the novel contribution of this paper lies in the multilateral elucidation of the failure mechanism in silty mudstone containing multiple fractures.
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Jingjing Lin,Song Yan,Xiaojie Zhang,Yueran Liu,Jun Lian,Hualin Lin,Wei Wei,Deli Lu,Sheng Han 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
Holey Fe-Anderson-type polyoxometalate/polyaniline/graphene (PPG) hybrid materials were first prepared by anchoring Anderson-type polyoxometalates [FeMo6O24H6]3- (FeMo6) onto graphene modified with polyaniline via a facile hydrothermal treatment. The as-prepared materials exhibited an excellent electrochemical performance with a high specific capacitance of 1366 F g -1 at 1 A g -1 and outstanding cycling stability (97.6% capacitance retention after 5000 cycle times). The uptake of polyaniline/FeMo6 nanoparticles on graphene not only provided the pseudocapacitance but also weakened the aggregation between the graphene layers, resulting in a higher surface area compared with pure graphene. In addition, the AC//PPG-15 asymmetric supercapacitor device showed a high energy density of 24.65 W h kg -1 at a low power density of 326.25 W kg -1 and good cycling stability (94.82% capacitance retention after 5000 cycles). Hence, the as-prepared PPG hybrid materials in this work possess tremendous potential as electrodes for high-performance supercapacitors.
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Yongdi Ma,Xi Chen,Shuai Wang,Hualin Dong,Xiaoying Zhai,Xin Shi,Jianzu Wang,Rujiang Ma,Wangqing Zhang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
PVDF membrane has strong hydrophobicity and low anti-pollution performance, greatly limiting its practicalapplication. These drawbacks have been successfully overcome by designing and then preparing amembrane with a semi-interpenetrating polymer (semi-IPN) of PVDF/poly(acrylic acid) (PAA) as themembrane matrix, TiO2 nanoparticles as functional components and F127 as pore-forming agent. Thesemi-IPN was prepared by copolymerizing acrylic acid with N,N methyl acrylamide in the presence ofPVDF, and the TiO2 gel nanoparticles were in situ formed in the membrane-forming process. The propertiesof the composite membrane were significantly affected by the semi-IPN, F127 and TiO2. By adjustingthe membrane structure with the semi-IPN, F127 and TiO2 nanoparticles, we prepared a composite membranewith a water contact angle of 40, a BSA rejection ratio of 87.5% and a water flux of 802.5 L/m2/h/bar. After a simple UV irradiation, the water flux of this composite membrane rose to 1030 L/m2/h/bar,without any rejection decline. The membrane contaminated by humic acid could recover the water fluxup to above 95.3% of its original value by a single UV irradiation, showing a very good antifouling performance. In addition, the composite membrane also exhibited a very strong pollution resistance and separationperformance for bovine serum albumin and oil-water emulsion. All in all, based on the synergy ofthe semi-IPN and the evenly dispersed TiO2 nanoparticles, the prepared composite membrane exhibitedexcellent comprehensive properties and demonstrated a great potential for various separationapplications.
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Xingjiang Li,Ya Liu,Ying Yang,Hua Zhang,Hualin Wang,Yue Wu,Min Zhang,Ting Sun,Jieshun Cheng,Xuefeng Wu,Lijun Pan,Shaotong Jiang,Hongwei Wu 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.3
The microbial fermentation of malic acid,which is one of the most important organic acid platformsused widely in food and chemical engineering, hasattracted considerable interest. A malate production strainwas isolated, a mutation was induced, and regulation of themetabolic network was then conducted. The identificationresults showed that the malic acid production strain, HF-119, belonged to Rhizopus delemar. An analysis of themetabolic pathway showed that the malic acid flux of thisstrain occurred through three main pathways, and manybyproducts, such as succinic acid, fumaric acid andethanol, were produced. Although corn straw hydrolytewas used, the metabolism of xylose was not as rapid as thatof glucose. Subsequently, breeding of the strains andregulation of the metabolic network resulted in an increasein malate yield, and the strain HF-121 produced more than120 g/L malic acid within 60 h. The ability to producemalic acid from biomass hydrolyte highlights the industrialdevelopment potential of this strain.
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