Time filter

Source Type

Zhenjiang, China

Tang G.,Jiangsu University | Tang G.,Zhenjiang College | Wang Y.,Jiangsu University | Chen W.,Jiangsu University | And 2 more authors.
Materials Letters

In this paper, flowerlike MoS2 hollow microspheres were synthesized by a facile hydrothermal solution route with the assistance of Pluronic F-127. The as-prepared products were characterized by X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental results indicated reaction time and surfactant have significant effects on the morphology of the as-prepared products. A possible formation mechanism has also been investigated on the basis of a series of transmission electron microscopy (TEM) studies of the product obtained at different durations. This well-controlled synthesis approach may be extended to fabricate complex hollow structures of other transition metal sulfide materials. © 2013 Elsevier B.V. All rights reserved. Source

Tang G.,Jiangsu University | Tang G.,Zhenjiang College | Tang H.,Jiangsu University | Li C.,Jiangsu University | And 2 more authors.
Materials Letters

WS2 nanorods with diameters of about 20-100 nm and lengths of about 0.1-2 μm were successfully synthesized by a simple hydrothermal method with the help of the surfactant Cetyltrimethylammonium Bromide (CTAB). As-prepared WS2 samples are characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Moreover, the influence of surfactant CTAB on the formation of WS2 nanorods was investigated. A possible three-step growth mechanism of WS2 nanorods, in which initial nucleation, self-assembly (oriented aggregation), and subsequent crystal growth (Ostwald ripening) is involved, is proposed to explain the formation of WS2 nanorods on the basis of observations of a time-dependent morphology evolution process. © 2011 Elsevier B.V. All rights reserved. Source

Tian P.,Zhejiang University | Tian P.,Zhenjiang College | Chen Z.-W.,Zhejiang University
Zhendong yu Chongji/Journal of Vibration and Shock

The specimen is assumed to be rigid payload in traditional earthquake simulation test control. To overcome the poor control precision of this kind of control, an earthquake simulation control strategy was proposed. In the control strategy, servo-control parameters were set reasonably by analyzing physical modes of elastic payload, so the transfer function of the shaking table can keep approximately unvaried under a variety of different loads. On this basis, the system identification method of vibration control was optimized. The shaking table system can achieve high simulation precision for seismic wave without pre-test step. The experimental results on the Zhejiang University shaking table indicate that with the control strategy, the first frame correlation coefficient between reference signal and control signal in time domain can be above 85% without pre-test step in the case of parameter optimization; and after several frames of earthquake simulation test, the correlation coefficient can reach 90% through identifying the transfer function continuously. Source

Liu B.,Zhenjiang College

Comparing with former national standard, GB/T 5613-2014 designation for cast steels and GB/T 14408-2014 low alloy steel castings for general engineering and structural purposes have many changes. In the paper according to these new national standards, main changes were introduced, analyzed and compared with old national standards. Through the paper user can comprehend deep and use these new standards in actual producing, teaching and research. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source

Xu J.,Jiangsu University | Xu J.,Zhenjiang College | Rong X.,Jiangsu University | Chi T.,Jiangsu University | And 4 more authors.
Journal of Applied Polymer Science

Hydroxyethyl methyl acrylate (HEMA) capped waterborne polyurethane-acrylate (WPUA) oligomer was firstly prepared from isophorone diisocyanate (IPDI), polyether polyol (NJ-220), dimethylolbutanoic acid (DMBA), HEMA via in-situ and anionic self-emulsifying method. Ultraviolet (UV) curable WPUA coating was obtained from HEMA-capped oligomer, butyl acrylate (BA) and multifunctional acrylates (TPGDA) as reactive diluents, and Darocur 1173 as photoinitiator. The physical properties of WPUA oligomers, such as particle size, apparent viscosity, and surface tension were investigated. Some mechanical properties of UV-WPUA films, such as contact angles, thermal properties, and solvent (water, HCl, NaOH, NaCl, and ethanol) resistance of UV-WPUA coating films were measured. The surface morphologies were measured by scanning electron microscope and atomic force microscope. The surface free energy of the UV-cured film was calculated from contact angle measurements using the Lewis acid-base three liquids method. The specific UV-WPUA coating was selected to protect the iron materials that observed the effect of the protection. The results indicate that the prepared UV-WPUA coating has excellent protective behavior to metal iron materials and may offer some contributions to protect iron cultural relics. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3142-3152, 2013 Copyright © 2013 Wiley Periodicals, Inc. Source

Discover hidden collaborations