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Selection of New Type Radial Steel Gate and Analysis of Static and Dynamic Characteristics
Zhonghao Zhang,Lan Jiaxin,Fan Feng,Zhi Xudong 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
Radial gate, mainly composed of gate leaf, arm and hinge, is a widely used gate types in hydraulic structures. This study proposed an improved model structure of radial gate, On the basis of the traditional radial gate, a pressure rod is added to connect the support arm and the bifurcation point of the lower fl ange of the longitudinal beam. The improved model structure of radial gate is designed, simulated and analyzed by using the general fi nite element software ANSYS. The results illustrate that the stress value and displacement value of each component of radial rigid gate with compression bar arrangement are greatly reduced compared with traditional gate, among which the arm stress reduction and the longitudinal radial displacement reduction are up to 28.14%, and 27.35%, respectively. In addition, the overall ultimate bearing capacity increased by 26.80% with only a few increase of steel consumption; When the gate is closed without water, the natural frequency and amplitude response frequency of the improved gate are higher than that of the traditional gate, furthermore the response amplitude of each key node is reduced. Hence, this new design provides a high potential for the overall stability and the anti-vibration performance of traditional radial gate.
Zhonghao Jin,Dao Li,Rui Ma,Xutao Peng,Guanzhong Lu,Xingyi Wang 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.3
2-Chloro-4,6-dinitroresorcinol was converted catalytically in one-pot operation to the corresponding Nalkyl secondary aminophenol, 4,6-bis(isopropylamino)resorcinol, in high yield by using acetone as alkyl source and hydrogen as reducing reagent over 10 wt.% Pd/C catalyst. The effects of reaction conditions, such as the amount of acetic acid, concentration of acetone, catalyst amount, and reaction time on the selectivity of 4,6-bis(isopropylamino)resorcinol were investigated.
Transcriptomics and proteomics analysis of Aβ (1-42)-induced neurotoxicity
Zhonghao Su,Zhuo Dong,Chunxia Guo,Ying Xu,Shuijin Shao,Zhenxia Qin 대한독성 유전단백체 학회 2019 Molecular & cellular toxicology Vol.15 No.3
Backgrounds: β-Amyloid (Aβ) is a principal constituent of senile plaques in Alzheimer’s disease (AD) and induces neuronal cell death. The molecular mechanism of how Aβ evokes neuronal cell death remains complicated, which were investigated in the present study. Methods: Using the human neuroblastoma cell line SHSY5Y, we investigated the neurotoxic effects of human β-Amyloid 1-42 (Aβ1-42) aggregates on gene expression profile and protein expression profile by using the Agilent GeneChip Human 1A (V2) Oligo MicroArray, Quantitative Real-time PCR, PF-2D and Western blot analysis. Results: Our results show that Aβ1-42 specifically influences gene and protein expression such as EGR1, eIF5A, PDE8A, ERp57 and ERp5 in pathways associated with apoptotic process, protein translation, cAMP catabolic process and response to endoplasmic reticulum stress. Conclusion: Although Genes with significant changes in transcriptomic analysis matched very few of the proteins identified in proteomics analysis, our findings will strengthen our knowledge concerning the molecular mechanisms underlying AD.
Wang, Zhonghao,Hu, Xun,Wang, Lina,Jin, Bingjun,Zou, Guojun,Huang, Zhiwei,Liu, Qing,Hu, Guangzhi,Zhang, Kan,Park, Jong Hyeok Elsevier 2019 ELECTROCHIMICA ACTA Vol.299 No.-
<P><B>Abstract</B></P> <P>Herein, electrochemically sluggish polymeric carbon nitride (PCN) is successfully introduced into NiCo<SUB>2</SUB>O<SUB>4</SUB> to form hybrids of NiCo<SUB>2</SUB>O<SUB>4</SUB> and PCN, in which PCN nanosheets are regarded as a substrate to promote the nucleation and subsequent in-situ growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. The surface of as-prepared hybrids are rich in Ni and Co ions in low and high valence state, respectively. In addition, the hybrids exhibit more hydrophilic compared with that of pristine NiCo<SUB>2</SUB>O<SUB>4</SUB> due to its higher amounts of hydroxyl group. It has been found that the nitrogen species originated from PCN nanosheets tend to bond with the metal ions and electrolyte used, resulting in tuning the electronic structural states and coupling effects with NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. Owing to these structural characteristics, the electrochemical performance as faradaic electrode materials and long-term stability of optimized hybrid is much superior to the bare NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiCo<SUB>2</SUB>O<SUB>4</SUB>-PCN samples were prepared via a facile and scalable strategy. </LI> <LI> The NiCo<SUB>2</SUB>O<SUB>4</SUB>-PCN-40 exhibited much higher supercapacitor performance than that of pure NiCo<SUB>2</SUB>O<SUB>4</SUB>. </LI> <LI> The PCN nanosheets can promote the nucleation and subsequent in-situ growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets in oriented way. </LI> <LI> The presence of PCN can tune the electronic structural states and coupling effects with NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The vertically growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> on PCN nanosheets substrate with 3D open frameworks synthesized here is beneficial for facilitating electrolyte ions transport and electron trapping, thus boosting the supercapacitor performance of NiCo<SUB>2</SUB>O<SUB>4</SUB>.</P> <P>[DISPLAY OMISSION]</P>
Zhang Zhonghao,Zhi Xudong,Li Qixun,Fan Feng 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.2
Along with other developments that have occurred in this era, building requirements include not only function and practicality but also encompass architectural elegance such as lighting and light-weight structures. Conventional latticed shell triangulation creates a poor architectural eff ect as well as mediocre lighting and excessive and cluttered componentry. A latticed shell with quadrilateral meshing is light and has excellent lighting properties, but it also has low rigidity and inferior stability. This study addresses this problem by deploying in-plane stayed cables and horizontal and vertical cables out-of-plane via a strut, and by developing a new single-layer spherical latticed shell system supported by cables. The eff ects that various parameters have on the mechanical properties of this structures such as the rise-span ratio, asymmetric load distribution, strut length, initial defects and cable pre-stress, are investigated based on mechanical responses such as structural displacement, internal force, critical bearing capacity and the instability modal. The basic rules of structural stress are summarised and examples of 100 m and 150 m large span latticed shell structures are used to verify and analyse the rules for the mechanical properties of this structure, and to investigate how applicable this type of architecture is in a large-span structure. Based on the sequence used to tension the cable(s) during construction, several plans for pre-stressing in-plane and out-of-plane cable(s) are also proposed. The eff ect that this pre-stressing sequence has on structural properties such as maximum displacement and critical bearing capacity is investigated at each stage of construction via a numerical simulation of the structure. A proper procedure for constructing this structure is also proposed to provide theoretical support for an actual project.