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27 results on '"Song, Changjian"'

10. Simulation and applications of the ship central cooling system in DMS2016 marine engineering simulator

Author

Sun Jianbo and Song Changjian

Subjects
Engineering, Software, business.industry, Interface (computing), Heat transfer, Flow (psychology), Crew, Water cooling, Node (circuits), Modular design, business, Simulation, Marine engineering
Abstract

Based on the analysis of the structure and mechanism of the ship cooling water system and the modular modeling method, the mathematical model of the cooling water system suitable for real-time simulation calculation is established, and the pipe network calculation is used to obtain the flow and each pipe's node pressure. The simulation data of the ship cooling water system are obtained by using Visual C ++ programming software, and the accuracy of the mathematical model is verified by comparing the simulation data with real ship data. The mathematical model can be used to describe the flow distribution, pressure variation and heat transfer in the ship cooling water system. The distributed visual simulation system interface developed by object-oriented technology is used to realize the dynamic operation of the cooling water system and ensure the simulation accuracy. The system has been successfully applied to DMS2016 large-scale marine engine simulator, and used in the crew teaching and training, and achieved significant results.

Published
2017

26. Benzobis(thiadiazole)-based small molecules as efficient electron transporting materials in perovskite solar cells.

Author

Wan, Li, Li, Xiaodong, Song, Changjian, He, Ying, and Zhang, Wenjun

Subjects
*THIADIAZOLES, *ELECTRON transport, *PEROVSKITE, *SOLAR cells, *MOLECULAR orbitals
Abstract

Abstract Novel small-molecules, B2T and B2F, based on benzobis(thiadiazole) have been designed and synthesized as electron transporting materials for perovskite solar cells (PSCs). Benefiting from the high electron affinity of benzobis(thiadiazole) unit, both B2T and B2F exhibited an efficient electron transporting ability in CH 3 NH 3 PbI 3-x Cl x planar-heterojunction (PHJ) PSCs. The device based on B2T exhibited an optimal power-conversion efficiency (PCE) of 13.0%, while that of B2F was 15.0% with a relatively low hysteresis. Compared to B2T device, the higher efficiency of B2F device was mainly due to the impressive increase in short-circuit current density (J SC), from 19.36 mA cm−2 to 22.13 mA cm−2. By comprehensive analysis of the energy level and photoluminescence spectra of the devices, we inferred that the higher J SC was resulted from the lower highest occupied molecular orbital (HOMO) energy level of B2F than B2T, which induced a more efficient hole-blocking and less recombination of charge carriers. Through the molecular design (from thiophene to fluorene), we developed a highly efficient electron transporting material, this strategy may provide a new building block to develop novel efficient interface materials for PSCs. Graphical abstract Two benzobis(thiadiazole)-based small molecules (B2T and B2F) were designed and synthesized. Simply by tuning the donor groups from thiophenes to fluorenes, perovskite solar cells with B2F as electron transporting layer exhibited a high power conversion efficiency of 15%. fx1 Highlights • Simply by tuning the donor groups from thiophenes to fluorenes, two effective electron transport materials were designed and synthesized, the they were used to the inverted perovskite solar cells. this may provide a new building block to develop novel efficient interface materials. • The device based on B2T exhibited an optimal power-conversion efficiency (PCE) of 13.0%, while that of B2F was 15.0% with a relatively low hysteresis. the higher efficiency of B2F device was mainly due to the impressive increase in short-circuit current density (JSC), from 19.36 mA cm−2 to 22.13 mA cm−2. • The higher JSC of B2F device resulted from the lower highest occupied molecular orbital (HOMO) energy level of B2F than B2T, which induced a more efficient hole-blocking and less recombination of charge carriers. [ABSTRACT FROM AUTHOR]

Published
2019
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27. Highly stable 3D homochiral coordination polymer with interweaving of double-stranded helices and extended metal-SO4-metal chains

Author

Wu, Jie, Huang, Chao, Fu, Leixia, Wang, Pei, Song, Chuanjun, Song, Changjian, Wang, Haiyu, Hou, Hongwei, and Chang, Junbiao

Subjects
*INORGANIC synthesis, *CHIRALITY, *COORDINATION polymers, *THERMAL analysis, *MOLECULAR self-assembly, *SULFATES, *MOLECULAR structure, *PHTHALAMIDES, *LIGANDS (Chemistry)
Abstract

Abstract: Solvothermal synthesis of an achiral ligand N,N-bis(3-pyridyl) isophthalamide (bpip) with ZnSO4 under 120°C yield a novel compound, [Zn(bpip)SO4]n, which displays chiral self-assembly into an infinite double-stranded helical coordination polymer consisting of two single-stranded helices with the same P handedness. These chiral infinite double-stranded helical chains are further interwoven by the 1D Zn–SO4–Zn chains to form a novel 3D framework structure with a rare 65.10 topology. On the basis of the results of TG-DSC analyses, the structure is thermally stable up to ~467.4°C. [Copyright &y& Elsevier]

Published
2012
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