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Chaochao Shi,Guangfeng Shi,Guoquan Shi,Haichao Li 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.7
The single crystal diamond chisel-edge tool is used to machine the 79 g/mm echelle diffraction grating, which is used as the research background. DEFORM-3D finite element software is used to simulate the mechanical ruling grating processing, and the influence of the parameters of the ruling tool on the squeezing force of aluminum film material is obtained. By analyzing the flow law of several sampling points in the groove-shaped over-squeezing region, the slip deformation characteristics of the aluminum film during the groove-shaped over-squeezing are clarified. Moreover, the velocity and stress field of aluminum film are analyzed under groove over-squeezing phenomenon. Therefore, it provides a basis for predicting the phenomenon of groove-shaped over-squeezing in the mechanical ruling grating processing.
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Chaochao Qin,Hongsheng Zhai,Xianzhou Zhang,Yufang Liu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.11
We theoretically investigated the coherent control of Autler-Townes splitting in photoelectron spectroscopy of K2 molecule within an ultrafast laser pulse by solving the time-dependent Schrodinger equation using a quantum wave packet method. It was theoretically shown that we can manipulate the splitting of photoelectron spectroscopy by altering the laser intensity. Furthermore, it was found that the percentages of each peak in photoelectron spectroscopy can be controlled by changing the envelope of the laser pulse.
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Removal of gaseous toluene by nonthermal plasma coupled with wet scrubber containing Fe2+
Chaochao Jiang,Caihong Qin,Mengke Guo,Jiayu Huang,Dongjie Yan,Xiaoqing Dang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
A non-thermal plasma with a wet scrubber (NTP + WS) was used to degrade gaseous toluene. Comparedwith the NTP + WS/H2O system, the toluene and by-product ozone removal efficiencies were increased by10% and 85% in the NTP + WS/Fe2+ system, respectively. For 60 ppm toluene degradation, the maximummineralization rate (MR) of toluene (61%) was obtained, at the optimum Fe2+ concentration of 50 mg/L. During catalytic oxidation, the removal efficiency of toluene was limited by its solubility in WS systems. In addition, decreased Fe2+ concentration and accumulation of organics led to the system deactivation. The EPR and quenching experiments verified the presence and contribution of hydroxyl radicals (4.6%)and superoxide radicals (3.8%) to the removal efficiency of toluene. Based on the radicals and intermediatesdetected in the gas and liquid phases, a degradation mechanism for toluene in the NTP + WS/Fe2+system was proposed.
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The Value of Tumor Treating Fields in Glioblastoma
Zhang, Chaochao,Du, Jianyang,Xu, Weidong,Huang, Haiyan,Gao, Li The Korean Neurosurgical Society 2020 Journal of Korean neurosurgical society Vol.63 No.6
Glioblastoma (GBM) is one of the most common tumors of the central nervous system, which is the most lethal brain cancer. GBM treatment is based primarily on surgical resection, combined with radiotherapy and chemotherapy. Despite the positive treatment, progression free survival and overall survival were not significantly prolonged because GBM almost always recurs. We are always looking forward to some new and effective treatments. In recent years, a novel treatment method called tumor treating fields (TTFields) for cancer treatment has been proposed. TTFields devices were approved by the Food and Drug Administration (FDA) for adjuvant treatment of recurrent and newly diagnosed GBMs in 2011 and 2015, respectively. This became the first breakthrough treatment for GBM in the past 10 years after the FDA approved bevacizumab for patients with relapsed GBM in 2009. This paper summarized the research results of TTFields in recent years and elaborated the mechanism of action of TTFields on GBM, including cell and animal experimental research, clinical application and social benefits.
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Qin, Chaochao,Zhai, Hongsheng,Zhang, Xianzhou,Liu, Yufang Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.11
We theoretically investigated the coherent control of Autler-Townes splitting in photoelectron spectroscopy of K2 molecule within an ultrafast laser pulse by solving the time-dependent Schrodinger equation using a quantum wave packet method. It was theoretically shown that we can manipulate the splitting of photoelectron spectroscopy by altering the laser intensity. Furthermore, it was found that the percentages of each peak in photoelectron spectroscopy can be controlled by changing the envelope of the laser pulse.
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Li Chaochao,Xu Xinhui,Liu Shenghao,Zhang Pengying 한국식물생명공학회 2024 Plant biotechnology reports Vol.18 No.1
Chalcone synthase (CHS), a key enzyme in plant flavonoid synthesis, is essential for plant tolerance to abiotic stress. However, little research on CHS from the earliest terrestrial plants, such as mosses, has been reported. Here, the biological function of a CHS gene from Antarctic moss Pohlia nutans (PnCHS1) was studied. PnCHS1 had a 32.8–53.7% similarity to CHS from other species, however it still had highly conserved motifs of CHS such as Catalytic site (Asn366, His333) and Co-A binding site (Ser146). Subcellular localization analysis showed that PnCHS1 was distributed in the cell membrane and in the membranes of endothelial organelles. Heterologous expression of PnCHS1 increased flavonoid content in 5-day-old Arabidopsis grown with 24 h light and 17-day-old Arabidopsis cultured with sucrose, as well as anthocyanin content in the latter. PnCHS1 heterologous expression in Arabidopsis increased plant tolerance to salt stress, including a high germina- tion rate and a long taproot. Heterologous expression of PnCHS1 boosted tolerance to oxidative stress while decreasing the sensitivity to ABA. Under H2O2 or ABA stress, the expression pattern of PnCHS1, ROS scavenging enzyme gene (FeSOD1, FeSOD2, Cu-Zn-SOD2, and Cu-Zn-SOD3) and three genes of ABA signal pathway (RAB18, RD29B, and NCED3) were considerably up-regulated by real-time quantitative analysis. It indicates that PnCHS1 could enhance plant tolerance to NaCl and oxidative stresses, and may play a role in the adaptation of Antarctic moss to extreme environments.
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Xiaowei Li,Chaochao Ren,Zheyao Wang,Pai Zhao,Hongmei Wang,Yuxing Bai 대한치과교정학회 2016 대한치과교정학회지 Vol.46 No.2
Objective: The purposes of this study were to measure the orthodontic forces generated by thermoplastic aligners and investigate the possible influences of different activations for lingual bodily movements on orthodontic forces, and their attenuation. Methods: Thermoplastic material of 1.0-mm in thickness was used to manufacture aligners for 0.2, 0.3, 0.4, 0.5, and 0.6 mm activations for lingual bodily movements of the maxillary central incisor. The orthodontic force in the lingual direction delivered by the thermoplastic aligners was measured using a micro-stress sensor system for the invisible orthodontic technique, and was monitored for 2 weeks. Results: Orthodontic force increased with the amount of activation of the aligner in the initial measurements. The attenuation speed in the 0.6 mm group was faster than that of the other groups (p < 0.05). All aligners demonstrated rapid relaxation in the first 8 hours, which then decreased slowly and plateaued on day 4 or 5. Conclusions: The amount of activation had a substantial influence on the orthodontic force imparted by the aligners. The results suggest that the activation of lingual bodily movement of the maxillary central incisor should not exceed 0.5 mm. The initial 4 or 5 days is important with respect to orthodontic treatment incorporating an aligner.
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Viscoelastic Fatigue Damage Properties of Asphalt Mixture with Different Aging Degrees
Songtao Lv,Chaochao Liu,Jianlong Zheng,Zhanping You,Lingyun You 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.6
In order to reveal the effects of aging on fatigue damage evolution pattern of asphalt mixture, and to reveal the fatigue damagepatterns of asphalt pavement during its service life more accurately, the viscoelastic fatigue damage model for the aged asphaltmixtures was proposed based on the Burgers viscoelastic model. The dissipation energy was taken as the damage variable, and thedirect tension fatigue tests for asphalt mixture in five different aging degrees were conducted. The viscoelastic parameters of the agedasphalt mixtures were obtained.The calculationmethod of the cumulative fatigue damage was proposed, which considers the agingeffects. Moreover, the critical fatigue damage degree and fatigue life calculation equations were derived by employing the fatiguedamage model, which were calculated and compared. The calculation errors range from 3% to 18%, which was within an acceptableerror range of 30%. The research results show that the aging has a prominent impact on fatigue properties of asphalt mixtures, whichcould be illustrated by the change of the parameters of the viscoelastic fatigue damage model for the aged asphalt mixtures. Theprediction precision of fatigue life is acceptable for using the proposed viscoelastic fatigue damage model.
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Wei Liu,Chaochao Hu,Wenli Xie,Peng Chen,Yi Zhang,Ran Yao,Kexin Li,Qing Chang 한국유전학회 2018 Genes & Genomics Vol.40 No.5
The red-necked phalarope is a wonderful species with specific morphological characters and lifestyles. Mitochondrial genomes, encoding necessary proteins involved in the system of energy metabolism, are important for the evolution and adaption of species. In this study, we determined the complete mitogenome sequence of Phalaropus lobatus (Charadriiformes: Scolopacidae). The circular genome is 16714 bp in size, containing 13 PCGs, two ribosomal RNAs and 22 tRNAs and a high AT-rich control region. The AT skew and GC skew of major strand is positive and negative respectively. Most of PCGs are biased towards A-rich except ND1. A codon usage analysis shows that 3 start codons (ATG, GTG and ATA), 4 stop codons (TAA, TAG, AGG, AGA) and two incomplete terminate codons (T–). Twenty two transfer RNAs have the typical cloverleaf structure, and a total of ten base pairs are mismatched throughout the nine tRNA genes. The phylogenetic tree based on 13 PCGs and 2 rRNA genes indicates that monophyly of the family and genus Phalaropus is close to genus Xenus plus Tringa. The analysis of selective pressure shows 13 protein-coding genes are evolving under the purifying selection and P. lobatus is different from other Scolopacidae species on the selective pressure of gene ND4. This study helps us know the inherent mechanism of mitochondrial structure and natural selection.
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