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CUI, YANZE,LEE, GWAN-SEOK,WANG, JUN Magnolia Press 2019 Zootaxa Vol.4559 No.2
<P>Taeniothrips changbaiensis sp. n. is described from specimens causing damage to the leaves of a species of Poaceae, Deyeuxia angustifolia, in Northeast China. This is one of three species of Taeniothrips with a banded fore wing, and one of only two species with an irregularly interrupted comb of microtrichia on abdominal tergite VIII. The number of setae is variable on the distal half of the fore wing first vein. </P>
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Jianhua Hou,Yanze Chen,Xiuping Meng,Ce Shi,Chen Li,Yuanping Chen,Hongchen Sun 대한치과교정학회 2014 대한치과교정학회지 Vol.44 No.6
Objective: To investigate the involvement of ephrinB2 in periodontal tissue remodeling in compression areas during orthodontic tooth movement and the effects of compressive force on EphB4 and ephrinB2 expression in osteoblasts and osteoclasts. Methods: A rat model of experimental tooth movement was established to examine the histological changes and the localization of ephrinB2 in compressed periodontal tissues during experimental tooth movement. RAW264.7 cells and ST2 cells, used as precursor cells of osteoclasts and osteoblasts, respectively, were subjected to compressive force in vitro. The gene expression of EphB4 and ephrinB2, as well as bone-associated factors including Runx2, Sp7, NFATc1, and calcitonin receptor, were examined by quantitative real-time polymerase chain reaction (PCR). Results: Histological examination of the compression areas of alveolar bone from experimental rats showed that osteoclastogenic activities were promoted while osteogenic activities were inhibited. Immunohistochemistry revealed that ephrinB2 was strongly expressed in osteoclasts in these areas. Quantitative real-time PCR showed that mRNA levels of NFATc1, calcitonin receptor, and ephrinB2 were increased significantly in compressed RAW264.7 cells, and the expression of ephrinB2, EphB4, Sp7, and Runx2 was decreased significantly in compressed ST2 cells. Conclusions: Our results indicate that compressive force can regulate EphB4 and ephrinB2 expression in osteoblasts and osteoclasts, which might contribute to alveolar bone resorption in compression areas during orthodontic tooth movement.
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Deformation Analysis of Engineering Reinforcement Straightening Based on Bauschinger Effect
Songhua Li,Chao Wei,Yanze Long 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.1
The Bauschinger eff ect is an important factor in metal forming process. Reinforcement straightening is a type of metal plastic forming processes, and it is theoretically infl uenced by the Bauschinger eff ect. However, in the fi eld of steel straightening technology, there is no study on the existence and infl uence of Bauschinger eff ect in the straightening process of steel bars. This study adopts the method of combining experiment with fi nite element simulation analysis. Firstly, based on the steel straightener, the HRB400E steel bar specimens were loaded forward and backward by adding tension pressure sensors and strain gauges, and the data were collected and analyzed. Finally, the exact constitutive parameters of reinforcing bar material are obtained through the tensile test of reinforcing bar, and the properties of reinforcing bar material are set by using the parameters combined with the multi-linear kinematic hardening model, so that the real simulation material model can be obtained. Experimental and simulation results both show that the yield limit of the reinforcement that is produced by plastic bending decreases noticeably during repeated reverse loading, moreover, the yield limit only decreases once in the subsequent reverse loading process. The study concludes that the Bauschinger eff ect exists in the straightening process of steel bars. Through the study, the existence and infl uence of Bauschinger eff ect should be fully considered and studied in the process of theoretical research and application of steel straightening, and at the same time, the reference basis for improving the accuracy and quality of steel straightening should be provided.
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