Wyniki wyszukiwania - BazTech

1

Experimental study on thermo physical parameter of loose coal bulk

Chen Q. H., Dai G. L., Zhang G. S., Fan X. Q., Qin R. X.

AGH Journal of Mining and Geoengineering

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2012

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Vol. 36, no. 3

89-98

EN

Experimental study was carried out on the thermo physical parameter of loose coal bulk, based on hot-wired method, the relationship between thermo physical parameter of loose coal bulk and each influence factors obtained, and the result shows that the thermal conductivity increased and thermal capacity decreased on condition that the coal rank increased, with the increasing of water content, thermal conductivity and thermal capacity are both have the trend of ascent. Within the experimental temperature limit (< 110 degrees of Celsius), thermal conductivity shows linear growth trend with the increasing of temperature. When voidage increased, thermal conductivity decreased, but the relevance between thermal capacity and voidage is unnoticeable.

PL

Wyniki badań eksperymentalnych przeprowadzonych w celu określenia parametrów termofizycznych luźnych brył węgla metodą "gorącej nici" (ang. hot-wire method) i zależności pomiędzy parametrem termofizycznym luźnych brył węgla a każdym z uzyskanych współczynników wpływu pokazują wzrost przewodności cieplnej i obniżenie pojemności cieplnej wraz z poprawą jakości węgla. Przy zwiększaniu zawartości wody przewodność cieplna i pojemność cieplna wykazują tendencje wzrostowe. W badanym zakresie temperatur (< 110 stopni Celsjusza) przewodność cieplna wzrasta liniowo wraz ze wzrostem temperatury. Zwiększenie przestrzeni pomiędzy elementami skutkowało obniżeniem przewodności cieplnej, jednak nie zaobserwowano związku pomiędzy pojemnością cieplną a większą przestrzenią między elementami.

2

Application of nitrogen injection displacement for fire extinguishment

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

AGH Journal of Mining and Geoengineering

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2012

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Vol. 36, no. 3

345-351

EN

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.

PL

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.

3

Structure and optical properties of (Alqx)/Al2O3 ethanol colloids

Chen Q. H., Wang W. J., Zhang W. G.

Materials Science Poland

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2010

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Vol. 28, No. 1

15--23

EN

An investigation into the structure and chemical stability of green light emitting aluminum complexes of 8-hydroxyquinoline (Alqx)/Al2O3 colloids was performed. (Alqx)/Al2O3 ethanol colloid was characterized by the high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy, thermogravimetric and simultaneous differential thermal analysis, and thermogravimetric analysis coupled to Fourier transform infrared spectroscopy (TGA/FTIR). The results show that the (Alqx)/Al2O3 nanoparticles are composed of an inner core of crystalline Al2O3 and an outer layer of 8-hydroxyquinoline (Q) coordinated to the surface aluminum ions of Al2O3 the nanoparticles. The luminescence intensity of the (Alqx)/Al2O3 ethanol colloids decreased upon the increasing aging time, and is accompanying by the presence of a brown material and a dark brown deposit produced in the colloids. The main component of the deposit was polystyrene. These findings can be explained by a process where Q coordinates to the surface ions of the Al2O3 particles, followed by degradation of the pyridine ring of 8- hydroquinonline, leading to the formation of polystyrene.

4

A study of a block copolymer synthesized by RAFT polymerization containing carbazole groups and a europium complex

Wang W., Ling Q. D., Lin M. J., Chen Q. H.

Materials Science Poland

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2010

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Vol. 28, No. 4

781--793

EN

A series of block copolymers containing carbazole groups were synthesized via reversible addition fragmentation chain transfer (RAFT) polymerization of styrene monomer. Then the block copolymer containing carbazole groups and europium complex was synthesized by coordination. The block copolymers were characterized by elemental analyses, FT-IR, 1HNMR, GPC, Uv-vis absorption, fluorescence spectroscopy and cyclic voltammetry. The GPC result shows that the block copolymers have narrow polydispersity and controlled molecular weights (MWs). The fluorescence spectroscopy of the block copolymer containing carbazole groups and europium complex shows red emission assigned to f-f transitions of europium ions in solid state. In addition, the presence of europium complex in the block copolymer was further evidenced by fluorescence characteristic of europium ions. The CV data reveals that in the block copolymer containing carbazole groups and the europium complex a balance can be achieved between electron currents and the electron-hole currents. Thus, the copolymer is a potentially useful candidate for fabricating memory or light emitting devices.