Experimental Study on Mechanical and Durability Properties of Glass and Polypropylene Fiber Reinforced Concrete

Jinliang Liu,Yanmin Jia,Jun Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9

The aim of the study is to validate the effect of glass fiber and polypropylene fiber on improving the mechanicaland durability properties of concrete. In this regard, glass fiber, polypropylene fiber and hybrid fiber were added to concrete,respectively. This paper conducted the compressive and bending flexural tests to confirm that the fiber enhances themechanical properties of concrete. In order to evaluate the durability of fiber reinforced concrete, the rapid chloride migrationtest and rapid chloride penetration test were carried out. The comparisons of experimental results illustrate that the hybridfiber reinforced concrete has the most significant effect on the concrete properties improvements. Moreover, comparing withthe glass fiber reinforced concrete, the polypropylene fiber reinforced concrete plays a better performance on mechanical anddurability properties.

Characterization of the effect of He⁺ irradiation on nanoporous-isotropic graphite for molten salt reactors

Zhang, Heyao,He, Zhao,Song, Jinliang,Liu, Zhanjun,Tang, Zhongfeng,Liu, Min,Wang, Yong,Liu, Xiangdong Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.6

Irradiation-induced damage of binderless nanoporous-isotropic graphite (NPIG) prepared by isostatic pressing of mesophase carbon microspheres for molten salt reactor was investigated by 3.0 MeV He⁺ irradiation at room temperature and high temperature of 600 ℃, and IG-110 was used as the comparation. SEM, TEM, X-ray diffraction and Raman spectrum are used to characterize the irradiation effect and the influence of temperature on graphite radiation damage. After irradiation at room temperature, the surface morphology is rougher, the increase of defect clusters makes atom flour bend, the layer spacing increases, and the catalytic graphitization phenomenon of NPIG is observed. However, the density of defects in high temperature environment decreases and other changes are not obvious. Mechanical properties also change due to changes in defects. In addition, SEM and Raman spectra of the cross section show that cracks appear in the depth range of the maximum irradiation dose, and the defect density increases with the increase of irradiation dose.

Research on New Nylon-6 Nanocomposites with Flame Retardancy

Jinliang Qiao,Xiaohong Zhang,Yiqun Liu,Weifu Dong,Qingguo Wang,Hua Gui,Jianming Gao,Zhihai Song,Jinmei Lai,Fan Huang 한국고분자학회 2006 한국고분자학회 학술대회 연구논문 초록집 Vol.2006 No.10

Research on the Promotion of Chinese Traditional Culture in Tai Chi Teaching in Chinese Colleges and Universities

Zhao Jinliang,Liu Zhao 한중경제문화학회 2020 한중경제문화연구 Vol.14 No.-

Correction method for calculating junction temperature considering parasitic effects in SiC MOSFETs

Fan Liu,Mingxing Du,Jinliang Yin,Chao Dong,Ziwei Ouyang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.4

The turn-on change rate of drain current diDS(on)/dt is an electrical parameter that is suitable for the online monitoring of junction temperature in SiC MOSFETs. In practical applications, the change of an external circuit changes the temperature-sensitive characteristic of diDS(on)/dt. In this paper, a SiC MOSFET in a Buck converter is taken as the research object. First, it is theoretically derived and experimentally verified that the power loop inductance and drive loop resistance are parasitic parameters that affect the temperaturesensitive characteristic of diDS(on)/dt. Second, according to the spectrum peak characteristics caused by the drain–source turn-off oscillation voltage of the SiC MOSFET, the theoretical relationship between the diDS(on)/dt temperature-sensitive characteristic and the peak of the drain–source turn-off oscillation voltage is studied. It is concluded that the spectrum peak can reflect the change of the diDS(on)/dt temperature-sensitive characteristic caused by the change of the parasitic parameters. Based on the above research, a model of a modified diDS(on)/dt temperature-sensitive characteristic considering parasitic effect is established in this paper. Through experimental verification, this model can largely eliminate the junction temperature monitoring error caused by the change of the external circuit.

Molecular Recognition Enables Nanosubstrate-Mediated Delivery of Gene-Encapsulated Nanoparticles with High Efficiency

Peng, Jinliang,Garcia, Mitch André,Choi, Jin-sil,Zhao, Libo,Chen, Kuan-Ju,Bernstein, James R.,Peyda, Parham,Hsiao, Yu-Sheng,Liu, Katherine W.,Lin, Wei-Yu,Pyle, April D.,Wang, Hao,Hou, Shuang,Tse American Chemical Society 2014 ACS NANO Vol.8 No.5

<P/><P>Substrate-mediated gene delivery is a promising method due to its unique ability to preconcentrate exogenous genes onto designated substrates. However, many challenges remain to enable continuous and multiround delivery of the gene using the same substrates without depositing payloads and immobilizing cells in each round of delivery. Herein we introduce a gene delivery system, nanosubstrate-mediated delivery (NSMD) platform, based on two functional components with nanoscale features, including (1) DNA⊂SNPs, supramolecular nanoparticle (SNP) vectors for gene encapsulation, and (2) Ad-SiNWS, adamantane (Ad)-grafted silicon nanowire substrates. The multivalent molecular recognition between the Ad motifs on Ad-SiNWS and the β-cyclodextrin (CD) motifs on DNA⊂SNPs leads to dynamic assembly and local enrichment of DNA⊂SNPs from the surrounding medium onto Ad-SiNWS. Subsequently, once cells settled on the substrate, DNA⊂SNPs enriched on Ad-SiNWS were introduced through the cell membranes by intimate contact with individual nanowires on Ad-SiNWS, resulting in a highly efficient delivery of exogenous genes. Most importantly, sequential delivery of multiple batches of exogenous genes on the same batch cells settled on Ad-SiNWS was realized by sequential additions of the corresponding DNA⊂SNPs with equivalent efficiency. Moreover, using the NSMD platform <I>in vivo</I>, cells recruited on subcutaneously transplanted Ad-SiNWS were also efficiently transfected with exogenous genes loaded into SNPs, validating the <I>in vivo</I> feasibility of this system. We believe that this nanosubstrate-mediated delivery platform will provide a superior system for <I>in vitro</I> and <I>in vivo</I> gene delivery and can be further used for the encapsulation and delivery of other biomolecules.</P>

SHARP ESTIMATES FOR MULTILINEAR COMMUTATOR OF LITTLEWOOD-PALEY OPERATOR

Hao, Jinliang,Liu, Lanzhe Korean Mathematical Society 2008 대한수학회논문집 Vol.23 No.1

In this paper, we prove the sharp estimates for multilinear commutator related to Littlewood-Paley operator. By using the sharp estimates, we obtained the weighted $L^p$-norm inequality for the multilinear commutator for 1 < p < $\infty$.

Excluding molten fluoride salt from nuclear graphite by SiC/glassy carbon composite coating

Zhao He,Jinliang Song,Pengfei Lian,Dongqing Zhang,Zhanjun Liu 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.5

SiC coating and SiC/glassy carbon composite coating were prepared on IG-110 nuclear graphite (ToyoTanso Co., Ltd., Japan) to strengthen its inertness to molten fluoride salt used in molten salt reactor(MSR). Two kinds of modified graphite were obtained and correspondingly named as IG-110-1 and IG-110-2, which referred to modified IG-110 with a single SiC coating and a SiC/glassy carbon compositecoating, respectively. Both structure and property of modified graphite were carefully researched andcontrasted with virgin IG-110. Results indicated that modified graphite presented better comprehensiveproperties such as more compact structure and higher resistance to molten salt infiltration. With theprotection of coatings, the infiltration amounts of fluoride salt into modified graphite were much lessthan that into virgin IG-110 at the same circumstance. Especially, the infiltration amount of fluoride saltinto IG-110-2 under 5 atm was merely 0.26 wt%, which was much less than that into virgin IG-110 under1.5 atm (13.5 wt%) and the critical index proposed for nuclear graphite used in MSR (0.5 wt%). The SiC/glassy carbon composite coating gave rise to highest resistance to molten salt infiltration into IG-110-2,and thus demonstrated it could be a promising protective coating for nuclear graphite used in MSR.

Experimental Investigation and Field Evaluation of Anti-Scouring and Protection Material of Earth-rock Dam

Gaoang Yuan,Jinliang Zhang,Guangkun Liu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.11

Earth-rock dams have important flood control, silt reduction, water supply, and ecological benefits, but extreme rainstorms seriously threatens the safe operation of earth-rock dams. Therefore, based on the self-developed soil stabilizer, the laboratory tests and field evaluation tests for the anti-scouring performance for solidified soil were carried out to achieve the requirements of non-collapse or slow-collapse for the earth-rock dams. Firstly, the basic performance indexes of solidified soil using soil stabilizer and 42.5# P.O Portland cement were compared. Then, clear water scouring and muddy water scouring tests were carried out based on the self-developed anti-scouring test system. Furthermore, an earth-rock dam test dam was built by using the solidified soil as the material, and a field scouring test was carried out to analyze the corresponding hydraulic elements. Finally, a safety inspection of the dam structure was carried out. The results demonstrate that when compared to the results of solidified soil using 42.5# P.O Portland cement under the same contents, the strength and durability of soil stabilizer solidified soil rose by more than 5% and 10%, respectively. The performance of soil stabilizer is better than that of 42.5# P.O Portland cement. After 10 hours of approximately 15 m/s water flow scouring through the experiment test, the performance of the solidified soil under the higher content of soil stabilizer can meet the design requirements of anti-scouring performance. The field test results show that the maximum scouring depth is less than 2 cm, and the average scouring depth is less than 0.8 cm. The monitoring results show that the displacements are less than 5 mm, and the dam structure is safe and stable. It is recommended that the content of soil stabilizer should be higher than 20% to meet the overflow safety requirements of small and medium earth-rock dams.

Quantitative Analysis of Electromagnetic Torque Generation Mechanism in Axial-Flux Permanent Magnet Machine Based on the Air-Gap Field Modulation Theory

Li Jie,Yang Gongde,Liu Jinliang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1

This paper proposes two axial-fux permanent magnet (AFPM) machines, i.e., NS and NN type, which all have the same stator and rotor structures but the diferent magnetic circuits. Since both PM magnetomotive force (MMF) and armature reaction MMF of the proposed AFPM machines are modulated by H-type armature stator, more feld harmonics that contribute to electromagnetic torque will be generated. The electromagnetic torque generation mechanism of the proposed AFPM machines is revealed and investigated from the perspective of air-gap feld modulation. The MMF-permeance model is established to analyze the feld modulation process of the PM MMF and armature reaction MMF. Based on the efective air-gap feld harmonics that generating steady electromagnetic torque, the electromagnetic torque generation mechanism of the proposed AFPM machines can be confrmed. A fnite element-based harmonic restoration method is used to quantify the electromagnetic torque generation mechanisms of the proposed AFPM machines. It shows that the total electromagnetic torque of the AFPM (NN) machine is lower than that of the AFPM (NS) machine, while the AFPM (NN) machine has higher feld modulation electromagnetic torque component due to the more signifcant feld modulation efect.