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Surface effects on the wave propagation in composites with random dispersive parallel cylindrical nanofibers

100%

Kong Z. , Qiang F. W. , Wei P. J. , Tang Q.

2015

tom Vol. 67, nr 5

355--370

The propagation of elastic waves in composites with randomly distributed parallel cylindrical nanofibers is studied. The non-classical boundary conditions on the surface of nanofibers are derived by using the surface elasticity theory. The scattering waves from an individual nanofiber are obtained by the plane-wave expansion method. These scattering waves from all nanofibers are summed up to obtain the multiple-scattering waves. The effective propagation constants (speed and attenuation) of coherent waves and the associated effective dynamical moduli of composites are evaluated numerically. Based on these numerical results, the influences of the surface effects on the effective dynamical properties of composites are discussed.

Application of nitrogen injection displacement for fire extinguishment

100%

Tang Q. , Qin R. X. , Chen Q. H. , Zhang G. S.

tom Vol. 36, no. 3

345-351

The article introduced the basic theory of nitrogen injection displacement for fire extinguish, which is presented by Professor Guoshu Zhang, applied this technology in coal mine, and then verified the results through numerical simulation, the production got from the technology's application. Presented some new views in specific implementation of nitrogen injection displacement for fire extinguish.

W niniejszym artykule opisano zastosowanie podstawowej teorii wypełniania zrobów azotem podczas gaszenia pożarów endogenicznych zaprezentowanej przez profesora Guoshu Zhang, jej zastosowanie w kopalni oraz weryfikację wyników za pomocą symulacji numerycznej i uzyskane efekty w związku z zastosowaniem tej technologii. Zaprezentowano szczegółowe zasady oraz poglądy na temat wypełniania zrobów azotem do zwalczania pożarów.

Microarray analysis reveals the role of matrix metalloproteinases in mouse experimental autoimmune myocarditis induced by cardiac myosin peptides

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Tang Q. , Huang J. , Qian H. , Xiong R. , Shen D. , Wu H. , Bian Z. , Wei X.

nr 2

Autoimmune myocarditis develops after the presentation of heart-specific antigens to autoaggressive CD4+ T cells and after inflammation has infiltrated the tissues. To shed light on global changes in the gene expression of autoimmune myocarditis and to gain further insight into the molecular mechanisms underlying the genesis of myocarditis, we conducted a comprehensive microarray analysis of mRNA using an experimental mouse autoimmune myocarditis model via immunization with α-myosin heavy chain-derived peptides. Of over 39,000 transcripts on a high density oligonucleotide microarray, 466 were under-expressed and 241 over-expressed by ≥ 1.5-fold compared with the controls in BALB/C mouse with autoimmune myocarditis. In this paper, we list the top 50 up-regulated genes related to the immune response. These altered genes encode for leukocyte-specific markers and receptors, the histocompatibility complex, cytokines/receptors, chemokines/receptors, adhesion molecules, components of the complement cascade, and signal transduction-related molecules. Interestingly, matrix metalloproteinases (MMPs) such as MMP-3 and MMP-9 were up-regulated, as further revealed by the reverse transcriptase-polymerase chain reaction (RT-PCR) and immunohistochemistry assays. This indicates that MMPs may act as major regulators of the cytokine profile. Together, these findings provide new insight into the molecular events associated with the mechanism of the autoimmune genesis of myocarditis.