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Uniaxial Eccentric Load Behavior of L-CFSST Composite Column
Zhen Wang,Zhe Liu,Xingbo Wang,Xuejun Zhou,Zhoutai Wang,Guodong Xian 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5
This study presents the mechanical behavior of L-shaped concrete-filled square steel tube (L-CFSST) composite columns under uniaxial eccentric compression. Nine specimens were tested and the effects of eccentricity, steel tube thickness, steel yield strength, and slenderness ratio were investigated regarding failure modes, ultimate load, load-lateral displacement curves, and load-strain curves. Test results showed that, under uniaxial eccentric load, these columns showed favorable mechanical properties and steel tubes showed strong cooperative working performance. There were two types of failure modes for these columns: local buckling of the steel tube or overall bending of the specimen. ABAQUS was used to simulate the loading process and the accuracy of the numerical simulation results was verified by comparing failure characteristics, load-displacement curves, and ultimate bearing capacity with the test results. The N/Nu-M/Mu curves of the columns under uniaxial eccentric load with different parameters were simulated by the finite element method. A simplified formula for predicting the N/Nu-M/Mu relationship was established based on the finite element analysis results, which might be a workable approach for designing L-CFSST composite columns in engineering practice.
Liuqiang Wang,Zhen Li,Chao Wang,Deyin Wang,Yucheng Wang,Mengzhu Lu 한국식물학회 2017 Journal of Plant Biology Vol.60 No.6
Peroxiredoxins (Prxs) are ubiquitous thiol-specificantioxidant enzymes that are critically involved in cell defenseand protect cells from oxidative damage. In this study, aputative Type II Prx (ThPrx1) was identified and characterizedfrom Tamarix hispida. The expression of ThPrx1 is highlyinduced in response to hydrogen peroxide (H2O2) and methylviologen (MV) stresses. When expressed ectopically, ThPrx1showed enhanced tolerance against oxidative stress in yeastand Arabidopsis. In addition, transgenic Arabidopsis plantsoverexpressing ThPrx1 displayed improved seedling survivalrates and increased root growth and fresh weight gain underH2O2 and MV treatments. Moreover, transgenic Arabidopsisplants showed decreased accumulation of H2O2, superoxide(O2•−) and malondialdehyde (MDA), increased superoxidedismutase (SOD) activity compared to wild-type (WT) plantsunder oxidative stress. Moreover, transgenic plants maintainedhigher photosynthesis efficiency and lower electrolyte leakagerates than that of WT plants under stress conditions. Theseresults clearly indicated that ThPrx1 plays an important rolein cellular redox homeostasis under stress conditions, leadingto the maintenance of membrane integrity and increasedtolerance to oxidative stress.
Wang Hai-Zhen,Zhang Ru-yi,Yuyu-Li,Liu Xin 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Gynaephora qinghaiensis is a pest in the alpine meadows of the Qinghai-Tibet Plateau (QTP) that seriously harms grassland vegetation. Sexual dimorphism (SD) is common in insects, but its molecular mechanism at the tran scriptome level in insects, especially in G. qinghaiensis, has not been reported. In this study, we conducted transcriptome analysis of pupae and adults of the two sexes (male and female) of G. qinghaiensis. A total of 204,557,900 clean reads assembled into 114,944 unigenes were obtained by RNA-Seq. To explore differences in the transcriptome levels of molecular characteristics related to SD between the two sexes of G. qinghaiensis, gene expression profiling was performed. A total of 88 differentially expressed unigenes related to sex determination were found in the pupae of G. qinghaiensis; of these, 74 were upregulated and 14 were downregulated in the female pupae compared to the male pupae. Forty-five unigenes related to sex determination were found in the adults of G. qinghaiensis; of these, 15 were upregulated and 30 were downregulated in the female adults compared to the male adults. This indicated some differences in the expression of genes involved in sex deter mination between male and female individuals of G. qinghaiensis. Therefore, we speculated that sex-determining genes may play an important role in the formation of sexual dimorphism in G. qinghaiensis. Our report provides a valuable genomic resource for further studies of grassland caterpillars and improves our understanding of the molecular mechanisms underlying sexual dimorphism between male and female insects.
Copper-Mediated Transformation of Organosilanes to Nitriles with DMF and Ammonium Iodide
Wang, Zhen,Chang, Sukbok American Chemical Society 2013 Organic letters Vol.15 No.8
<P>Cyanation of aryl-, diaryldimethyl-, and styrylsilanes was developed for the first time under copper-mediated oxidative conditions using ammonium iodide and DMF as the combined source of nitrogen and carbon atom of the introduced cyano unit, respectively. The reaction was observed to proceed in a two-step process: initial conversion of organosilanes to their iodo intermediates and then cyanation. This method has a broad substrate scope with high functional group tolerance.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2013/orlef7.2013.15.issue-8/ol400659p/production/images/medium/ol-2013-00659p_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol400659p'>ACS Electronic Supporting Info</A></P>
Zhen Wang,Yanli Zhang,Dianhai Zhang,Ziyan Ren,고창섭 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2
The presence of direct current (dc) biased magnetic feld enhances the vibration and noise in the transformer cores due to magnetostrictive efect in the grain-oriented electrical steel laminations. Based on an Epstein frame, an experimental setup was built to measure the in-plane magnetostriction, the principal magnetostriction was computed under a dc bias, and the infuence of dc bias magnetic feld on the magnetostrictive property of electrical steel sheet was investigated. A model based on a back propagation neural network (BPNN) method assisted with the Levenberg–Marquardt algorithm was proposed to describe the magnetostrictive behaviour in the presence of dc bias. Finally, the BPNN model was verifed by comparing the measured magnetostriction and the computed one. This research is helpful to make an accurate estimation to deformation of iron core under a dc bias.