http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Shichang Li (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
-
Shichang Li,Shiping Yin,Yu Gao 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.4
As a type of cement-based composite reinforcement material, textile reinforced concrete (TRC) has the advantages of corrosion resistance, high bearing capacity and good crack limit performance. Its bonding performance with the existing concrete interface is the key factor affecting the reinforcement effect. To study the interfacial adhesion between TRC and existing concrete, the sodium chloride concentration, the frequency and number of dry and wet cycles, the bonding length of the TRC reinforcement layer and the type of reinforcement were analysed by a double-sided shear test, XRD (X-ray diffraction) and SEM (scanning electron microscope) micro-test techniques. The influence of other factors on the interfacial bonding properties was further elaborated based on the theory of fracture energy. The results show that interface damage under chloride attack was mainly divided into three typical interface failure modes. By increasing the concentration of sodium chloride, reducing the frequency of dry and wet cycles and increasing the number of dry and wet cycles, the interface microstructure damage could be aggravated. Using cast-in-place reinforcement and increasing the bonding length could enhance the bonding performance of the interface.
-
Laguerre characterizations of hypersurfaces in Rn
Shichang Shu,Yanyan Li 대한수학회 2013 대한수학회보 Vol.50 No.6
Let x : M → Rn be an n − 1-dimensional hypersurface in Rn, L be the Laguerre Blaschke tensor, B be the Laguerre second fun- damental form and D = L + λB be the Laguerre para-Blaschke tensor of the immersion x, where λ is a constant. The aim of this article is to study Laguerre Blaschke isoparametric hypersurfaces and Laguerre para- Blaschke isoparametric hypersurfaces in Rn with three distinct Laguerre principal curvatures one of which is simple. We obtain some classification results of such isoparametric hypersurfaces.
-
Shichang Liu,Quanfeng Li,Xuanyu Hong,Yahui Zuo,Dingjiang Zou 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2
To effectively suppress the electromagnetic vibration generated by a permanent magnet motor at different frequency bands and to further improve the comprehensive control performance of the system, a new vector control strategy is proposed in this paper. The speed controller and current controller of the traditional vector control system of a permanent magnet synchronous motor (PMSM) are improved by means of an active disturbance rejection controller (ADRC) and a super-twisting sliding mode controller (STSMC). At the same time, random frequency space pulse width modulation (RFSVPWM) based on a periodic function is proposed to replace the traditional SVPWM. First, the expression of the radial electromagnetic force wave generated by motor supply current harmonics in low and medium frequency as well as high-frequency sideband is deduced by an analytical method, and the reason for the generation of the new radial electromagnetic force based on PI vector control is determined. Second, the ADRC, STSMC, and RFSVPWM are designed to suppress the power supply current harmonics and radial electromagnetic force components that greatly contribute to the electromagnetic vibration of the motor in different frequency bands. Finally, the superiority of the improved PMSM vector control system in terms of the comprehensive control performance and electromagnetic vibration is verified by multi-physics coupled finite element simulations.
-
LAGUERRE CHARACTERIZATIONS OF HYPERSURFACES IN ℝ<sup>n</sup>
Shu, Shichang,Li, Yanyan Korean Mathematical Society 2013 대한수학회보 Vol.50 No.6
Let x : $M{\rightarrow}\mathbb{R}^n$ be an n - 1-dimensional hypersurface in $\mathbb{R}^n$, L be the Laguerre Blaschke tensor, B be the Laguerre second fundamental form and $D=L+{\lambda}B$ be the Laguerre para-Blaschke tensor of the immersion x, where ${\lambda}$ is a constant. The aim of this article is to study Laguerre Blaschke isoparametric hypersurfaces and Laguerre para-Blaschke isoparametric hypersurfaces in $\mathbb{R}^n$ with three distinct Laguerre principal curvatures one of which is simple. We obtain some classification results of such isoparametric hypersurfaces.
-
Linda Maharjan,Lekhendra Tripathee,Shichang Kang,Balram Ambade,Pengfei Chen,Huijun Zheng,Quanlian Li,Kundan Lal Shrestha,Chhatra Mani Sharma 한국대기환경학회 2021 Asian Journal of Atmospheric Environment (AJAE) Vol.15 No.4
This study was conducted in the Central Himalayan middle hills to understand the nature of polycyclic aromatic hydrocarbons (PAHs) embedded in aerosol particles, their sources and human health risk assessments. The level of sum of 15 particlephase PAHs was between 9 and 335 ng/m3, with an average concentration of 73±66 ng/ m3. There were strong seasonal differences in total suspended particles (TSP) and particle- bound PAH concentrations with higher concentrations in winter, followed by premonsoon and lowest in monsoon. The main contributor to the suspended particles was 5-ring PAHs (32%), followed by 4-ring (29%), 6-ring (28%), and 3-ring PAHs (11%). Conversely, the gas-phase PAHs showed that 3-ring PAHs contributed utmost to the total particles. The molecular ratios and principal component analysis indicated that both petrogenic and pyrogenic sources, particularly fossil fuel combustion, biomass combustion, and car exhausts, were the major sources of PAHs. The overall average Benzo (a)pyrene equivalent concentration of particulate PAHs was 11.71 ng/m3, which substantially exceeded the WHO guideline (1 ng/m3), and indicated the potential health risks for local residents. The average lifetime inhalation cancer risk (ILCR) estimates associated with carcinogenic PAHs was 8.78×10-6 for adults, suggesting the possible cancer risk and 2.47×10-5 for children, signifying extreme carcinogenic effects of PAHs on children’s health. Therefore, strict measures should be taken to reduce PAHs emissions in the region.
-
Jianhui Cai,Limin Xia,Jinlei Li,Shichang Ni,Huayu Song,Xiangbin Wu 대한암학회 2019 Cancer Research and Treatment Vol.51 No.1
Purpose We investigated the role of tumor-associated macrophages (TAMs) on the epithelial to mesenchymal transition (EMT) of colorectal cancer cells and determined the potential mechanism involved in the metastatic process. Materials and Methods In this study, flow cytometry was used to detect the expression of target proteins. We used transwell assay to evaluate the migration of cancer cells under specific conditions. Using real-time polymerase chain reaction, we examined the expressions of cytokines and EMTrelated markers in mRNA level. Animal assay was performed for analysis in vivo and hematoxylin and eosin was used to visualize the effect of TAMs on tumor metastasis. We also used immunohistochemistry and Western blotting to detect the expression of target proteins. Results Here, we observed enrichment of TAMs in colorectal tumor tissues, resulting in high metastasis in clinical therapy. Moreover, those TAMs could facilitate the EMT progression of colorectal cancer cells, which is induced by the transforming growth factor-β (TGF-β) derived from TAMs, leading to the invasion and migration of cancer cells. Conclusion Our results demonstrated that TAMs contributed the EMT progression through a TGF-β/ Smad2,3-4/Snail signaling pathway, and disrupting this pathway with TGF-β receptor inhibitor could suppress metastasis, readjusting our focus to the connection of TAMs and cancer metastasis.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
