Mechanical Behavior of Reinforced Embankment with Different Recycling Waste Fillers

Lihua Li,Hongzhi Sheng,Henglin Xiao,Xinlong Zhou,Yiming Liu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.8

The application of construction and demolition (C&D) waste and used tires in geotechnical engineering contributes to the demand of the sustainable development. This study mainly compared the mechanical behavior of pure sand embankment (PSE), C&D material embankment (CDME), sand-tire shreds mixture embankment (STSME) through a scale model test. Effects of tire shreds content, the first layer geocell reinforcement burial depth, geocell reinforcement depth and compaction degree on the bearing capacity of embankments were investigated. Moreover, embankment load-settlement ratio, the reinforced bearing capacity ratio, the bearing capacity improvement factor (IF), the embankment surface deformation, and the vertical earth pressure distribution inside the embankment were discussed. Results indicate that both C&D material fillers and sand-tire shreds mixture can improve the bearing capacity and stability of embankment slopes. However, C&D material is better than sand-tire shreds mixture in the improvement. The optimum value of tire shreds content is 5%. The reinforcement effect of geocell decreases with the increase of reinforcement depth. With the increase of the buried depth of the first layer, it first increases and then decreases. With the increase of compaction degree increases. The minimum earth pressure appears near the slope. The bearing capacity of CDME is greater than STSME. The ultimate bearing capacity of CDME under the action of the geocell is twice that of the unreinforced embankment.

Effects of Phytosterol Ester on the Fatty Acid Profiles in Rats with Nonalcoholic Fatty Liver Disease

Lihua Song,Haiyue Zhou,Wenjuan Yu,Xinwen Ding,Li Yang,Jiayi Wu,Chenwei Song 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.2

Both serum and hepatic fatty acid (FA) compositions differ among nonalcoholic hepatic steatosis, nonalcoholic steatohepatitis, and healthy subjects. The severity of the above liver disease is closely associated with the concentration and composition of FAs. Our previous study found that phytosterol ester (PSE) could alleviate hepatic steatosis in nonalcoholic fatty liver disease rats. The aims of this work were to explore the effects of PSE (0.05/100 g·body weight) on FA profiles and the mRNA levels of FA metabolism-related genes. Compared with a high-fat diet alone group, PSE treatment significantly decreased hepatic saturated fatty acid levels (P < .05) and increased monounsaturated fatty acid (especially C16:1 n-7) levels in the liver, serum, and adipose tissue and polyunsaturated fatty acid levels in the serum and liver (P < .05) after 12 weeks of intervention. In particular, PSE treatment increased the level of C22:5 n-3, an FA that was negatively correlated with the degree of hepatic steatosis in the serum, liver, and adipose tissue. The increases in some unsaturated fatty acids are probably related to the upregulation of stearoyl-coenzyme A desaturase-1 and fatty acid desaturase-1.

The Feasibility Analysis of Recycled Aggregates from Construction and Demolition Waste for Permeable Pavement

Lihua Li,Xuanyu Shen,Jiabei Liu,Wentao Li,Chuheng Zhong,Xinlong Zhou 대한토목학회 2023 KSCE JOURNAL OF CIVIL ENGINEERING Vol.27 No.2

For reusing the construction and demolition waste (C&DW) materials and solving waterloggingproblems, the feasibility of applying C&DW to the permeable pavement (PP) was investigated. The recycled brick aggregate (RBA) and recycled concrete aggregate (RCA) were used as PPbase materials under different mixing ratios and grades. Geotextiles were also used in thisstudy as filter contaminants. Modified compaction tests, rainfall model tests, and columnleaching tests were conducted on a total of 15 samples with three gradations and five RBA andRCA mix ratios. The specimens for the rainfall model test were compacted at around optimummoisture content, and the degree of compaction was 97%. Using the sub-layer compactionmethod, each group of samples is compacted in five layers in strict accordance with thespecifications. In general, C&DW has the potential to be used underground without pollutionto the groundwater. The heavy metal concentrations in C&DW are less than in the local soiland related to material resources. The water yield performance was the best when 100%concrete was used to build PP, and the total water storage was the most when 100% of brickswere chosen to make PP. Due to the excellent permeability, C&DW can be selected forpavement fillers. The geotextile reduces the permeability by about 13% but effectively filtersout more than 50% of the fine particles in the rainfall. The permeability performance ofconcrete aggregates may be better than that of bricks, and fine particles can reduce thepermeability.

A serine/threonine phosphatase 1 of Streptococcus suis type 2 is an important virulence factor

Lihua Fang,Jingjing Zhou,Pengcheng Fan,Yunkai Yang,Hongxia Shen,Weihuan Fang 대한수의학회 2017 Journal of Veterinary Science Vol.18 No.4

Streptococcus suis is regarded as one of the major pathogens of pigs, and Streptococcus suis type 2 (SS2) is considered a zoonotic bacterium based on its ability to cause meningitis and streptococcal toxic shock-like syndrome in humans. Many bacterial species contain genes encoding serine/threonine protein phosphatases (STPs) responsible for dephosphorylation of their substrates in a single reaction step. This study investigated the role of stp1 in the pathogenesis of SS2. An isogenic stp1 mutant (stp1) was constructed from SS2 strain ZJ081101. The stp1 mutant exhibited a significant increase in adhesion to HEp-2 and bEnd.3 cells as well as increased survival in RAW264.7 cells, as compared to the parent strain. Increased survival in macrophage cells might be related to resistance to reactive oxygen species since the stp1 mutant was more resistant than its parent strain to paraquat-induced oxidative stress. However, compared to parent strain virulence, deletion of stp1 significantly attenuated virulence of SS2 in mice, as shown by the nearly double lethal dose 50 value and the lower bacterial load in organs and blood in the murine model. We conclude that Stp1 has an essential role in SS2 virulence.

Improved Compressed Network Coding Scheme for Energy-Efficient Data Communication in Wireless Sensor Networks

( Ying Zhou ),( Lihua Yang ),( Longxiang Yang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.6

An improved energy-efficient compressed network coding method is proposed for the data communication in the wireless sensor networks (WSNs). In the method, the compressed sensing and network coding are jointly used to improve the energy efficiency, and the two-hop neighbor information is employed to choose the next hop to further reduce the number of the transmissions. Moreover, a new packet format is designed to facilitate the intermediate node selection. To theoretically verify the efficiency of the proposed method, the expressions for the number of the transmissions and receptions are derived. Simulation results show that, the proposed method has higher energy efficiency compared with the available schemes, and it only requires a few packets to reconstruct measurements with reasonable quality.

Activation of persulfate by UV and Fe²⁺ for the defluorination of perfluorooctanoic acid

Song, Zhou,Tang, Heqing,Wang, Nan,Wang, Xiaobo,Zhu, Lihua Techno-Press 2014 Advances in environmental research Vol.3 No.3

Efficient defluorination of perfluorooctanoic acid (PFOA) was achieved by integrating UV irradiation and $Fe^{2+}$ activation of persulfate ($S_2O{_8}^{2-}$). It was found that the UV-$Fe^{2+}$, $Fe^{2+}-S_2O{_8}^{2-}$, and UV-$S_2O{_8}^{2-}$ processes caused defluorination efficiency of 6.4%, 1.6% and 23.2% for PFOA at pH 5.0 within 5 h, respectively, but a combined system of UV-$Fe^{2+}-S_2O{_8}^{2-}$ dramatically promoted the defluorination efficiency up to 63.3%. The beneficial synergistic behavior between $Fe^{2+}-S_2O{_8}^{2-}$ and UV-$S_2O{_8}^{2-}$ was demonstrated to be dependent on $Fe^{2+}$ dosage, initial $S_2O{_8}^{2-}$ concentration, and solution pH. The decomposition of PFOA resulted in generation of shorter-chain perfluorinated carboxylic acids (PFCAs), formic acid and fluoride ions. The generated PFCAs intermediates could be further defluorinated by adding supplementary $Fe^{2+}$ and, $S_2O{_8}^{2-}$ and re-adjusting solution pH in later reaction stage. The much enhanced PFOA defluorination in the UV-$Fe^{2+}-S_2O{_8}^{2-}$ system was attributed to the fact that the simultaneous employment of UV light and $Fe^{2+}$ not only greatly enhanced the activation of $S_2O{_8}^{2-}$ to form strong oxidizing sulfate radicals ($SO{_4}^{\cdot-}$), but also provided an additional decarboxylation pathway caused by electron transfer from PFOA to in situ generated $Fe^{3+}$.

Reaction kinetics for synthesis of isopropyl myristate catalyzed by sulfated titania

Ting Qiu,Lihua Zhou,Yu Niu,Jinbei Yang,Chenggang Li,Xiaoting Guo,Ling Li 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.8

Sulfated titania (SO4 2−/TiO2) was prepared and characterized by nitrogen adsorption-desorption, FT-IR, thermostability analyzer, XRD and particle size analyzer. The esterification of myristic acid (MA) with isopropanol (IPOH) catalyzed by the solid super acid SO4 2−/TiO2 was studied. The effect of reaction kinetics conditions such as temperature, stirrer speed, initial mole ratio of alcohol to acid, and catalyst loading on the conversion of myristic acid was investigated. A second-order pseudo-homogeneous model was developed to calculate the rate of the reaction, and then the kinetic parameters were estimated. The calculated values were in agreement with experimental data.

Evaluation of light-emitting diode colors and intensities on slaughter performance, meat quality and serum antioxidant capacity in caged broilers

Tan Zichao,Zhou Chuanfeng,Shi Xueping,Wang Lihua,Wang Shubai 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.5

Objective: This study was to evaluate the interaction of three different light-emitting diode (LED) light colors (white, green, and blue) and three intensities (5, 10, and 15 lx) on slaughter performance, meat quality and serum antioxidant capacity of broilers raised in three-layer cages. Methods: A total of 648 (8-days-old) male broiler chicks (Cobb-500) were randomly assigned in 3×3 factorially arranged treatments: three light colors (specifically, white, blue, and green) and three light intensities (namely, 5, 10, and 15 lx) for 35 days. Each treatment consisted of 6 replicates of 12 chicks. The test lasted for 35 days. Results: The semi-eviscerated weight percentage (SEWP) in 5 lx white was higher than that in 15 lx (p<0.01). The eviscerated weight percentage (EWP) (p<0.05) and water-loss percentage (WLP) (p<0.01) decreased in 10 lx white light than those in green light. Under blue light, the content of hypoxanthine (Hx) in muscle was lower than that under white and green light (p<0.01). The content of malondialdehyde (MDA) in 15 lx blue light was higher than that in 10 lx green light (p<0.05). Light color had an extremely significant effect on thigh muscle percentage, WLP, Hx, and crude protein content (p<0.01). Light intensity had a significant effect on SEWP (p<0.05), EWP (p<0.05), lightness (L*) value (p<0.05), WLP (p<0.01), and the contents of superoxide dismutase (p<0.05), MDA (p< 0.01), glutathione peroxidase (p<0.01). Conclusion: Using white LED light with 10 lx light intensity can significantly improve the chicken quality of caged Cobb broilers, improve the content of inosine acid in chicken breast and enhance the antioxidant capacity of the body. We suggest that the broiler farm can use 10 lx white LED light source for lighting in 8 to 42 days.

pH-Responsive Multifunctional Materials with Switchable Superamphiphobicity and Superoleophobicity-Superhydrophilicity for Controllable Oil/Water Separation

Mengnan Qu,Yichen Zhou,Lili Ma,Yi Zhang,Jiaxin Wang,Shanxin Xiong,Lihua Shen,Jinmei He 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3

Stimulus-responsive materials with controllable oil/water separation performance have prodigious potentialapplication. Here, a new thought for low-cost, time-saving, flexible approach has been developed to prepare a pH-responsivematerial with switchable superamphiphobicity and superoleophobicity-superhydrophilicity. The as-prepared material can beeasily applied onto multifarious substrates and presents stable superamphiphobicity. However, when the modified material istreated by alkaline solution, its surface wettability turns superhydrophilicity and superoleophobicity, thus water is allowed topenetrate through the material whereas the oil was blocked on the surface. Moreover, the surface wettability can be recoveredto superamphiphobicity quickly via treating the material with acidic aqueous. Hence, such a controllable water wettabilityand stable oil repellency property endows the as-prepared material with excellent capability to separate water from oil/watermixture. In addition, the pH-responsive materials can maintain switchable wettability after being treated by acid and alkalinumerous cycles. Furthermore, the obtained materials also exhibit excellent recyclable, self-cleaning and flame-resistantperformance, which shows potential applications for smart water-oil separators and fire-shielding protectors.

Microstructure and mechanical properties of Al-Fe-V-Si alloy and composites

BoluXiao,Jianzhong Fan,Lihua Zhou,Likai Shi 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.2

Al-Fe-V-Si alloy and composites from it were prepared by a powder metallurgy (PM) route as well as by mechanical alloying (MA). Globular particles referred to as α-Al13 consisted of a quaternary silicide of Alx(FeV)ySi and α-AlFeSi diminished after ball milling and grows slightly during the fabrication process. Whereas, the particle in the PM samples grew extensively. For PM samples, the high temperature mechanical strength of the composite is slightly higher than for the unreinforced alloy.