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- 저자 : Zhitao Zhang (검색결과 10 건)
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Study on the Tensile Properties and Application of Gravelly Soil Reinforced by Polypropylene Fiber
Zhitao Zhang,Enyue Ji,Zhongzhi Fu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.8
Incorporating fibers into gravelly soil is an effective method to prevent the core wall of high earth core rockfill dams (ECRDS) from cracking. In this study, a new type of soil tensile device was used to carry out tensile tests on gravelly soil with different gravel contents and fiber contents. The test results show that as the gravel content increases from 0% to 50%, the improvement in tensile strength decreases from 48.9% to 6.4%, which means the increase in gravel content reduces the improvement in tensile strength significantly. The ultimate tensile strain, tensile strength, and post-peak tensile strength of fiber-reinforced gravelly soil are positively correlated with the fiber content. Combined with the Scanning electron microscopy (SEM) results, the reinforcement effect of the three types of fiber interfaces on the gravel soil is qualitatively analyzed, and the microscopic mechanism of the improvement of the tensile strength of fiber-reinforced gravelly soil is revealed. The energy absorption capacity (EAC) results showed that the lower the gravel content in the soil, the higher the degree of improvement in the EAC value. In practical application, it is recommended to use gravel soil with low gravel content and high fiber content. Finally, a regression model considering the gravel content and fiber content was proposed for fast predicting the tensile strength of the soil. The related results can provide references for the anti-cracking design of the core wall of high ECRDS.
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Micro-gap DBD Plasma and Its Applications
( Zhitao Zhang ),( Cheng Liu ),( Mindi Bai ),( Bo Yang ),( Cheng Qi Mao ) 한국동굴학회 2006 동굴 Vol.76 No.-
The Dielectric Barrier Discharge (DBD) is a nonequilibrium gas discharge that is generated in the space between two electrodes, which are separated by an insulating dielectric layer. The dielectric layer can be put on either of the two electrodes or be inserted in the space between two electrodes. If an AC or pulse high voltage is applied to the electrodes that is operated at applied frequency from 50Hz to several MHz and applied voltages from a few to a few tens of kilovolts rms, the breakdown can occur in working gas, resulting in large numbers of micro-discharges across the gap, the gas discharge is the so called DBD. Compared with most other means for nonequilibrium discharges, the main advantage of the DBD is that active species for chemical reaction can be produced at low temperature and atmospheric pressure without the vacuum set up, it also presents many unique physical and chemical process including light, heat, sound and electricity. This has led to a number of important applications such as ozone synthesizing, UV lamp house, CO2 lasers, et al. In recent years, due to its potential applications in plasma chemistry, semiconductor etching, pollution control, nanometer material and large area flat plasma display panels, DBD has received intensive attention from many researchers and is becoming a hot topic in the field of non-thermal plasma.
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Micro-gap DBD Plasma and Its Applications
Zhang, Zhitao,Liu, Cheng,Bai, Mindi,Yang, Bo,Mao, Chengqi The Speleological Society 2006 동굴 Vol.76 No.-
The Dielectric Barrier Discharge (DBD) is a nonequilibrium gas discharge that is generated in the space between two electrodes, which are separated by an insulating dielectric layer. The dielectric layer can be put on either of the two electrodes or be inserted in the space between two electrodes. If an AC or pulse high voltage is applied to the electrodes that is operated at applied frequency from 50Hz to several MHz and applied voltages from a few to a few tens of kilovolts rms, the breakdown can occur in working gas, resulting in large numbers of micro-discharges across the gap, the gas discharge is the so called DBD. Compared with most other means for nonequilibrium discharges, the main advantage of the DBD is that active species for chemical reaction can be produced at low temperature and atmospheric pressure without the vacuum set up, it also presents many unique physical and chemical process including light, heat, sound and electricity. This has led to a number of important applications such as ozone synthesizing, UV lamp house, CO2 lasers, et al. In recent years, due to its potential applications in plasma chemistry, semiconductor etching, pollution control, nanometer material and large area flat plasma display panels, DBD has received intensive attention from many researchers and is becoming a hot topic in the field of non-thermal plasma.
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Surface Parameter Measurement of Braided Composite Preform Based on Faster R-CNN
Zhitao Xiao,Lei Pei,Lei Geng,Ying Sun,Fang Zhang,Jun Wu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3
Pitch length and surface braiding angle are two important parameters of braided composite preforms. In this paper,a method based on Faster R-CNN is proposed to measure the two parameters. First, after image acquisition, a fabric imagedatabase including initial cropped images, augmented images, and target images is established. Then, the target images areclassified into four categories according to the gray change characteristics. Third, a Faster R-CNN fabric detection model istrained on the fabric image database. Fourth, targets are detected by the trained network, and corners are detected based onthe detected targets. Finally, pitch lengths and surface braiding angles are measured based on the detected corners. Experimental results show that the proposed method achieves the automatic measurement of pitch lengths and surfacebraiding angles of 2D and 3D braided composite preforms with high accuracy.
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Shuang Zhao,Zhitao Yan,Eric Savory,Bin Zhang 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.34 No.2
This study aimed to analyze the wind-induced mechanical energy (WME) of a proposed super high-rise and long-span transmission tower-line system (SHLTTS), which, in 2021, is the tallest tower-line system with the longest span. Anew index – the WME, accounting for the wind-induced vibration behavior of the whole system rather than the local part, was first proposed. The occurrence of the maximum WME for a transmission tower, with or without conductors, under synoptic winds, was analyzed, and the corresponding formulae were derived based on stochastic vibration theory. Some calculation data, such as the drag coefficient, dynamic parameters, windshielding areas, mass, calculation point coordinates, mode shape and influence function, derived from wind tunnel testing on reducedscale models and finite element software were used in calculating the maximum WME of the transmission tower under three cases. Then, the influence of conductors, wind speed, gradient wind height and wind yaw angle on WME components and the energy transfer relationship between substructures (transmission tower and conductor) were analyzed. The study showed that the presence of conductors increases the WME of transmission towers and changes the proportion of the mean component (MC), background component (BC) and resonant component (RC) for WME; The RC of WME is more susceptible to the wind speed change. Affected by the gradient wind height, the WME components decrease. With the RC decreasing the fastest and the MC decreasing the slowest; The WME reaches the its maximum value at the wind yaw angle of 30o . Due to the influence of three factors, namely: the long span of the conductors, the gradient wind height and the complex geometrical profile, it is important that the tower-line coupling effect, the potential for fatigue damage and the most unfavorable wind yaw angle should be given particular attention in the wind-resistant design of SHLTTSs.
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Xin Fu,Yuan Liu,Zhitao Wu,He Zhang 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
A simple, highly sensitive and selective method based on the rhodamine B-covered gold nanoparticle with dual-readout (colorimetric and fluorometric) detection for L-cysteine is proposed. A mechanism is that citratestabilized AuNPs were modified with RB by electrostatic interaction, which enables the nanometal surface energy transfer (NSET) from the RB to the AuNPs, quenching the fluorescence. In the presence of L-cysteine, it was used as a competitor in the NSET by the strongly Au-S bonding to release RB from the Au surface and recover the fluorescence, and the red-to-purple color change quickly, which was monitored simply by the naked eye. Under the optimum conditions, the detection limit is as low as 10 nM. The method possessed the advantages of simplicity, rapidity and sensitivity at the same time. The method was also successfully applied to the determination of L-cysteine in human urine samples, and the results were satisfying.
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Fu, Xin,Liu, Yuan,Wu, Zhitao,Zhang, He Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
A simple, highly sensitive and selective method based on the rhodamine B-covered gold nanoparticle with dual-readout (colorimetric and fluorometric) detection for $\small{L}$-cysteine is proposed. A mechanism is that citrate-stabilized AuNPs were modified with RB by electrostatic interaction, which enables the nanometal surface energy transfer (NSET) from the RB to the AuNPs, quenching the fluorescence. In the presence of $\small{L}$-cysteine, it was used as a competitor in the NSET by the strongly Au-S bonding to release RB from the Au surface and recover the fluorescence, and the red-to-purple color change quickly, which was monitored simply by the naked eye. Under the optimum conditions, the detection limit is as low as 10 nM. The method possessed the advantages of simplicity, rapidity and sensitivity at the same time. The method was also successfully applied to the determination of $\small{L}$-cysteine in human urine samples, and the results were satisfying.
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Qiao, Guo,Xu, De-Hai,Wang, Zishen,Jang, In-Kwon,Qi, Zhitao,Zhang, Mingming,Kim, Su-Kyoung Elsevier 2015 FISH AND SHELLFISH IMMUNOLOGY Vol.44 No.1
<P><B>Abstract</B></P> <P>Our previous study demonstrated that Pacific white shrimp (<I>Litopenaeus vannamei</I>) infected by multiple pathogens showed higher mortality and death occurred more quickly than those infected by a single pathogen (Jang et?al., 2014). For better understanding the defense mechanism against white spot syndrome virus (WSSV) and <I>Vibrio anguillarum</I>, immune responses of shrimp were evaluated in this study. The mRNA expression levels of five immune-related genes were analyzed by quantitative reverse real-time PCR, which included proPO-activating enzyme 1 (PPAE1), PPAE2, proPO activating factor (PPAF), masquerade-like serine proteinase (Mas) and ras-related nuclear gene (Ran). Results demonstrated that the transcription was suppressed more intensively in the multiple infection group than those in single infection groups. The transcriptional suppression was directly related to the higher mortality. The hypoimmunity could benefit pathogen invasion, replication and release of toxin <I>in?vivo</I>. Results in this study will help to understand immune defense mechanism after shrimp were infected by multiple pathogens in aquaculture.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Immune genes in shrimp were studied to understand defense mechanism against multiple pathogens. </LI> <LI> Shrimp infected by multiple pathogens showed higher mortality and death occurred more quickly. </LI> <LI> Gene transcription was suppressed in shrimp with multiple infections than single infection. </LI> <LI> Depression of immune genes resulted in low PO activity, phagocytosis and led to high mortality. </LI> <LI> Prevention and management strategies are needed to reduce shrimp losses by multiple pathogens. </LI> </UL> </P>
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