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Zu X.-D.,Nanjing University of Science and Technology | Huang Z.-X.,Nanjing University of Science and Technology | Zhai W.,Shandong Non metallic Material Institute
Latin American Journal of Solids and Structures | Year: 2015

The protective capability of the Kevlar fibre-reinforced rubber composite armour (KFRRCA) at different obliquities is studied using depth-of-penetration experiments method against a 56 mmdiameter standard-shaped charge. Efficiency factors are calculated to evaluate the protection capability of the KFRRCA at different obliquities. Meanwhile, an X-ray experiment is used to observe the deformation, fracture, and scatter of the shaped-charge jet as it penetrates the composite armour. Finally, scanning electron microscopy (SEM) is used to analyse the effect of the Kevlar fibrereinforced rubber for the composite armour to resist jet penetration. The results showed that the KFEECA can be used as additional armour, because it has excellent protection capability, and it can disturb the stability of the middle part of the shaped charge jet (SCJ) obviously especially when the armour at 30°and 68° obliquities. © 2015, Brazilian Association of Computational Mechanics. All rights reserved.

Li M.,Shandong University | Li M.,Shandong Non metallic Material Institute | Li Y.,Shandong University | Zhang J.,Shandong University | Feng S.,Shandong University
Polymer Engineering and Science | Year: 2014

In this study, the blending system of natural rubber (NR) and silicone rubber (SR) at 70/30 ratio was investigated. Two kinds of graft polymers, polysiloxane-g-octane with different grafted ratios (polymers A, B, and C) and polysiloxane-g-(3,7-dimethyl-6-octylene) (polymer D), were designed and synthesized to serve as compatibilizers. Dynamic mechanical analysis and scanning electron microscopy analyses showed that the compatibilizers improved the compatibility between NR and SR, and resulted in improved mechanical properties. For example, the tensile strength of the blends with compatibilizer C was 11.7 MPa, whereas that of the blends without any compatibilizer was only 7.86 MPa. The larger the grafted ratios, the better the compatibilization effect of the graft polymer. The differences in compatibilization effects between non-reactive (polysiloxane-g-octane) and reactive [polysiloxane-g-(3,7-dimethyl- 6-octylene)] compatibilizers can be attributed to their different chemical compositions. The crosslink density obtained from solid-state nuclear magnetic resonance indicated that the reactive compatibilizer (polymer D) engaged in the crosslink reaction through the active vinyl at the side chains, which effectively inhibited the decreasing trend of the crosslink density caused by the addition of compatibilizers. © 2013 Society of Plastics Engineers.

Han L.,University of Electronic Science and Technology of China | Xiang Z.,Southwest Institute of Electronic Equipment of China SWIEE | Tao B.,University of Electronic Science and Technology of China | Zeng M.,University of Electronic Science and Technology of China | And 2 more authors.
ISAP 2013 - Proceedings of the 2013 International Symposium on Antennas and Propagation | Year: 2013

An improved TR (transmission/reflection) method for measuring the complex permittivity of powder and liquid samples with slabline is provided in this paper. The method can afford quite high accurate measurement results without singularities, and broaden the operating frequency band to 2-18GHz. Some experiments are carried out to verify the feasibility of the improved TR method for permittivity measurement. The proposed method is validated by the measurement of the permittivity of Teflon from 2GHz to 18 GHz. Some useful conclusions are obtained for the development of measurement methods. © 2013 Antenna Society of the Chinese Institute of Electronics.

Liu Y.,Peking Union Medical College | Liu Y.,Shandong Non metallic Material Institute | Zhang D.,Peking Union Medical College | Zhang R.,Peking Union Medical College | Li Z.,Peking Union Medical College
Analytical Chemistry | Year: 2016

Cancer development and chronic diseases are associated with the overexpression of sialoglycans terminated to the surface proteins and lipids of cancer cells compared with normal cells. The isolation and detection of sialoglycopeptides from complex peptides mixture still remain challenges due to their low abundance, low ionization, and losses of sialic acid residues and water molecule during analytical processes. In this study, kapok fiber, a natural fiber derived from the kapok tree (Bombax ceiba L.), has shown excellent capability to specifically and efficiently enrich sialoglycopeptides, without losses of sialic acid residues and water molecule from sialoglycans. The main components on the surface of kapok fiber are syringyl and guaiacyl lignins which play an important role in isolating sialoglycopeptides from complex peptide mixtures. © 2015 American Chemical Society.

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