The Influence of Non-synchronous Excavation of Twin Curved Shield Tunnels

Shaohua Li,Changfu Huang,Tiejun Yao,Pengfei Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5

The theoretical model of twin curved shield tunnels and refined numerical model considering the characteristics of wedge-shaped segment ring joints were established in this paper. Two construction schemes of taking the inner side or outer side of the twin curved tunnels as the first tunnel were conducted for comparison. Then two main characteristics of curved tunnel construction (over-excavation and yaw excavation loadings) were taken as variables to explore their response to the approaching construction caused by unsynchronized driving of twin curved shield tunnels. The ground surface settlement troughs obtained by the analytical solution and numerical simulation are in good agreement with the monitoring result. On the condition that the curved tunnel at the inner side is taken as the first tunnel, the excavation will intensify the ground settlement and the internal forces of its segment. In the case that the overcutting gap is not of large volume, it is advisable to first excavate the curved tunnel at the outer side, and then construct the curved tunnel at the inner side. The influence of soil loss on the ground disturbance is greater than that of construction loadings. The excessive overcutting gap not only easily induces a sharp increase in the ground vertical displacement, but also may lead to the movement of soil at the inner and middle sides towards the inner side of the curved tunnels, and causes the soil at the outer side to move towards the outer side of the curved tunnels. Remarkably, excessive overcutting gap may lead to large horizontal displacements of the ground surface.

Infection of Taenia asiatica in a Bai Person in Dali, China

Li Wang,Xuenong Luo,Junling Hou,Aijiang Guo,Shaohua Zhang,Hailong Li,Xuepeng Cai 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.1

Slide Session : OS-GAS-05 ; Gastroenterology : 3-Mercaptopyruvate Sulfurtransferase Downregulation Ameliorates Hepatic Steatosis and Oxidative Stress Via Hydrogen Sulfi de Metabolism in Nonalcoholic Fatty Liver Disease

( Meng Li ),( Jiexia Ding ),( Xingyong Wan ),( Xi Jin ),( Shaohua Chen ),( Chaohui Yu ),( Youming Li ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: The mitochondrial enzyme 3-mercaptopyruvate sulfurtransferase (MPST) is a source of endogenous hydrogen sul.de (H2S), a gaseous signaling molecule implicated in a wide range of physiological processes. The mechanisms of pathogenesis underlying nonalcoholic fatty liver disease (NAFLD) remain unclear. The possible role of MPST in the development of NAFLD has never been investigated. Methods: The NAFLD cell model was established by treating L02 cells with free fatty acid (FFA) overload. A variety of cellular and molecular approaches were used to study the effects of MPST on hepatic steatosis, oxidative stress and inflammation involved in NAFLD. Results: After culturing L02 cells by FFA for 24h, we detected the increased protein level of MPST. MPST knockdown in L02 cells resulted in a marked decrease of lipid accumulation and downregulation of SREBP-1 pathway and melioration of oxdiative stress, embodied in decreased level of H2O2, MDA and IL-6, meanwhile, increased levels of ATP and MMP. Unexpectedly, we observed a significantly increased level of H2S after knockdown of MPST. And the expression of CSE was enhanced when the MPST was decreased. When the level of H2S was decreased, the TG and H2O2 content within FFA-induced hepatocytes were greatly raised. Meanwhile, we demonstrated the reversed expression of SREBP-1/ ACC pathway with the reduced level of H2S. Conclusions: We showed that MPST knockdown could stimulate the compensatory process of CSE, causing the increasing of H2S which is recently considered as a novel antioxidant gas. The increased endogenous H2S could improve hepatocyte steatosis and partly improve the process of oxidative stress and in. ammatory state of steatosis hepatocytes. MPST is implicated in NAFLD via its important H2S metabolism. It provided new insight into the pathogenic mechanisms of NAFLD, pointing to potential target for therapeutic strategy.

Genome-wide identification of calcium-dependent protein kinases (CDPKs) in pear (Pyrus bretschneideri Rehd) and characterization of their responses to Venturia nashicola infection

Liu Shaohua,Li Junhao,Li Na,Zhou Peng,Li Liulin 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.6

Calcium-dependent protein kinases (CDPKs) play signifi cant roles in response to environmental stresses in plants. However, the CDPK gene family in pear ( Pyrus bretschneideri Rehd) has not been thoroughly explored. In this study, we performed a comprehensive analysis of CDPK family genes in pear, and 30 CDPK genes were identifi ed, unevenly distributed across 13 chromosomes, and predicted to be mainly localized at the plasma membrane. Based on phylogenetic analysis and struc- tural features, the PbCDPKs were classifi ed into four distinct subfamilies. In addition, many putative cis-acting elements responsive to hormones and environmental stresses were identifi ed in the promoter regions. According to RNA-seq data, the majority of PbCDPK genes showed diff erential expression in diff erent pear tissues. After inoculation of plants with the fungus Venturia nashicola , four PbCDPK genes were diff erentially expressed in resistant and susceptible pear cultivars, suggesting that they might play an important role in resistance to the pear scab pathogen. These candidate genes will be subjected to disease resistance and functional analysis in future work. Our results thus provide a genome-wide characterization of CDPK family genes in pear and lay the foundation for further functional analysis.

Research on Automatic Drawing Supported Mass Customization

He Ketai,Li Li,Li Sujian,Dong Shaohua 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10

Full-space Cloud of Random Points with a Scrambling Metasurface

Li, Zile,Dai, Qi,Mehmood, Muhammad Q.,Hu, Guangwei,yanchuk, Boris Luk’,Tao, Jin,Hao, Chenglong,Kim, Inki,Jeong, Heonyeong,Zheng, Guoxing,Yu, Shaohua,Alù,, Andrea,Rho, Junsuk,Qiu, Cheng-Wei Nature Publishing Group UK 2018 Light, science & applications Vol.7 No.1

<▼1><P>With the rapid progress in computer science, including artificial intelligence, big data and cloud computing, full-space spot generation can be pivotal to many practical applications, such as facial recognition, motion detection, augmented reality, etc. These opportunities may be achieved by using diffractive optical elements (DOEs) or light detection and ranging (LIDAR). However, DOEs suffer from intrinsic limitations, such as demanding depth-controlled fabrication techniques, large thicknesses (more than the wavelength), Lambertian operation only in half space, etc. LIDAR nevertheless relies on complex and bulky scanning systems, which hinders the miniaturization of the spot generator. Here, inspired by a Lambertian scatterer, we report a Hermitian-conjugate metasurface scrambling the incident light to a cloud of random points in full space with compressed information density, functioning in both transmission and reflection spaces. Over 4044 random spots are experimentally observed in the entire space, covering angles at nearly 90°. Our scrambling metasurface is made of amorphous silicon with a uniform subwavelength height, a nearly continuous phase coverage, a lightweight, flexible design, and low-heat dissipation. Thus, it may be mass produced by and integrated into existing semiconductor foundry designs. Our work opens important directions for emerging 3D recognition sensors, such as motion sensing, facial recognition, and other applications.</P></▼1><▼2><P><B>Metasurfaces: scrambling light for 3D detection and recognition</B></P><P>Firing light at a manufactured 'metasurface'—one carrying patterns at a smaller scale than the wavelength of the light—fills large volumes of space with defined points of light, potentially improving 3-D recognition and sensor applications. Cheng-Wei Qui and colleagues at the National University of Singapore, with co-workers across Asia and in the USA, created their unique metasurface from amorphous silicon. Light is scattered from and transmitted through the material to generate a cloud of data points in the surrounding space in which the structure and motion of objects under study can be analyzed. The initial development work with this “scrambling metasurface” suggests it could improve pattern recognition, including face recognition, motion detection and augmented reality applications. The researchers describe how their innovation overcomes significant limitations of existing methods in these fields.</P></▼2>

Theory Analysis of Harmonic Current Generation and Harmonic Current Extraction of Three-phase Grid-connected Inverter

Shaohua Sun,Hongqi Ben,Yingge Li,Leyi Wang,Shuai Yu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

Theory of the harmonic current generation of three-phase grid-connected inverter under unbalanced grid conditions is analyzed in detail in this paper. Based on the characteristic of three-phase currents, the structure of three adaptive notch filter(ANF) cells collaborating with fast positive and negative sequence decomposition(FPNSD) cell is proposed, which employs for the extraction of harmonic current. The main function of this harmonic current extraction method is to provide harmonic current for voltage regulation and power control of inverter. Moreover, this method is capable of extracting a selective order of harmonic where elimination of certain harmonic is of concern. The performance and analysis of the proposed structure in this study are verified through experimental cases.

Effects of Components on the Photoelectric Properties of CuxO Nanotubes Fabricated by Using Thermal Oxidation of Copper Nanowires

Shaohua Chen,Xuan Liu,Shengyang Dai,Wenfeng Xiang,Haizhong Guo,Junjian Li 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.2

CuxO (Cupric Oxide) nanotubes (NTs) were synthesized by using thermal oxidation of Cu nanowires (NWs) for 2 and 4 hours, respectively, and the effect of the components on their photoelectrical properties due to the infrared (IR) light with a wavelength of 1064 nm were investigated. In the 2-h CuxO NTs, the main component was Cu2O; however, the 4-h CuxO NTs were composed of a mixture of CuO and Cu2O. The photoelectric properties showed that the voltage difference and the sensitivity of 4-h CuxO NTs were more than 3 times those of the 2-h CuxO NTs, and its linear range was only about one-third that of the 2-h CuxO NTs. The above results were caused by the 4-h CuxO NTs containing a higher content of CuO, which had a suitable bandgap of 1.2 eV for light with a wavelength of 1064 nm. In addition, the response and the recovery times for the 4-h NTs were on the same order as those of the 2-h NTs. The conclusions from this article indicated that 4-h and 2-h NTs were very promising for the design of IR photodetector device with higher sensitivity and a larger detection range respectively.

PtPd/molecular sieve as dual-functional monolithic adsorbent/catalyst for effective removal of trace toluene at low-temperature and their electric-heating performance

Shuangde Li,Tao Wang,Mu Zhou,Shaohua Chai,Linfeng Nie,Zhenjiang Wu,Ning Han,Yunfa Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

A dual-functional adsorption–catalytic system for elimination of trace toluene is developed and realizedover molecular sieve-hosted varied ratio of platinum and palladium catalysts. PtPd/molecular sieveexhibites PdO and PtO2 around 2–3 nm particles with uniform loading verified by XRD, TEM, Ramanand XPS. The adsorption–desorption–catalysis for trace toluene purification is evaluated on the quartzmicro-reactor and the self-made electrically heated equipment. 3Pt1Pd/molecular sieve shows tolueneadsorption capacity of 18.22 mg/g and desorption efficiency about 77%, together with the maximum desorptiontemperature at 100 C. 3Pt1Pd/molecular sieve owns toluene conversion with 38.3% and 100% at100 and 200 C, accompanied with the higher CO2 selectivity of 0.0% and 150.0%, separately, due to thehigher Pd2+ content. The catalyst displays water vapor endurance, reproducibility, and 83.0% carbon balanceduring the whole adsorption–desorption–catalysis within 150 min, which highlights the sustainableapplicability in lean VOCs abatement. Furthermore, the possible catalytic reaction pathway of tolueneoxidation is proposed based on the in-situ DRIFTS experiments.

Functionalized moso bamboo powder adsorbent for Cd(II) complexes with citric acid/tartrate acid: characterization, adsorptive performance, and mechanism

Qinju Sun,Shaohua Lin,Guohua Liu,Yue Xuan,Liping Gao,Pingping Li 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.5

A new amine group functionalized moso bamboo powder adsorbent (AMBP) was prepared using a facile procedure to remove Cd(II) complexes with citric acid (CA) and tartrate acid (TA). The properties of the AMBP were characterized using SEM, FTIR, XPS, BET, and an elemental analysis. The adsorptive performances of the AMBP toward Cd(II)-CA/TA were investigated. The results indicated that amine group was successfully introduced, and the AMBP with a BET specific surface area of 0.463 ㎡/g was effective in adsorbing Cd(II)-CA/TA under pH 4.0–10.0. The removal of Cd(II) increased significantly when the Cd(II)/ligand molar ratio changed from 1:0.5 to 1:2. The adsorption processes of Cd(II)-CA/TA were endothermic and fit well with the pseudo-second-order kinetic model (R² > 0.999). The Langmuir model (qmax of 14.41 and 7.58 mg/g for Cd(II)-CA and Cd(II)-TA, respectively) fit the isotherms better than the Freundlich model. The AMBP could be regenerated by HCl and reused at least 4 times. The uptake mechanisms of Cd(II)-CA/TA were proposed to be physisorption and the chemisorption of the coordination between –NH₂/–NH and the Cd(II). This work shows that the AMBP is an adsorbent with high practical value to remove Cd(II) in water or wastewater containing CA/TA.