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1

Quorum Sensing Materials as New Ligand for Palladium Catalyzed Migita-Kosugi-Stille Polycondensation

Wang A., Toyofuku M., Nomura N., Goto H.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 13, iss. 1

62-70

EN

Signal molecules for quorum sensing are employed for ligands to palladium. The complex can be used as a catalyst. Migita-Kosugi-Stille coupling reactions are driven by using a series of N-(3- oxo-acyl)-L-homoserine lactones as ligands coordinating with Pd. Catalysis of [Pd-(signal molecules for quorum sensing), or Pd/QS] allows production of conjugated polymers with light-emitting functions.

2

A Study of Surface Uniformity for Helical Passageways in Abrasive Flow Machining

Wang A., Cheng K.-C., Chen K.-Y., Chou S-H.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 9b

13-16

EN

This work develops a mechanism with a helical passageway to perform multiple flowing paths of abrasive media, whose flowing behavior enhances polishing effectiveness by increasing the abrasive surface area and radial shear forces. Numerical results indicate that the design of a four helices passageway performs better in uniform surface roughness than other passageway by utilizing CFD-ACE+ software. Moreover, experimental results show that a helical passageway presents an excellent solution to enhance surface roughness uniformity and roughness improvement rate.

PL

W artykule rozwinięto mechanizm śrubowej ścieżki z wielokrotnym przepływem medium ściernego której właściwości można polepszać zwiększając ścieralność podłoża i siły radialne.

3

Soil fauna community dynamics during soil thawing period in the subalpine and alpine forests of Western China

Wu F., Yang W., Yang Y., Wang A., Tan B.

Polish Journal of Ecology

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2012

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Vol. 60, nr 4

755--766

EN

The frequently changed temperature could have great effects on soil fauna community during soil thawing period in cold areas. Therefore, soil faunas were investigated in both the soil organic layer (OL) and mineral soil layer (ML) in the primary fir (Abies faxoniana) forest (PF), fir and birch (Betula albosinensis) mixed forest (MF) and secondary fir forest (SF) in the eastern Qinghai–Tibet Plateau every ten days between March 5 and April 25, 2009. Soil macrofauna was picked up by hand in the fields. Mesofauna was collected and separated from the soil samples by Baermann and Tullgren methods, respectively. The dominated species of macrofauna belonged to Coleoptera and Diptera at the early stage of soil thawing, and to Coleoptera, Diptera, Araneae and Hymenoptera at the later stage. However, the dominated species of mesofauna belonged to Nematode, Collembola, and Acari in the whole soil thawing. The density, number of taxa, and diversity index of soil fauna showed significant change with temperature fluctuations and reached an obvious peak when soil temperatures rising above 0[degrees]C. The density and number of taxa of macrofauna in both the OL and ML were the lowest on March 5 in the three forests, but the density of mesofauna in both the OL and ML was the highest on March 25, except for the ML in the PF. These results implied that soil fauna community was sensitive to temperature fluctuations, which is important in understanding the ecological processes in the winter–spring transitional period.

4

Highly sensitive tunable diode laser absorption spectroscopy of CO2 around 1.53 m

Liu Y., Li B., Zhai Y., Wang A.

Optica Applicata

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2006

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Vol. 36, nr 1

15-22

EN

The absolute absorption spectrum intensities of carbon dioxide sample have been recorded with a tunable diode laser spectrometer in the spectral range 6506-6520 cm-1, which is suitable for the in situ sensing of carbon dioxide in the lower stratosphere, and were studied using a commercial telecommunication-type diode laser. The intensity of the weakest line we detected in this experiment is 9.116×10-27 cm-1/(moleculeźcm-2) at a pressure of 0.35 torr, and the corresponding absorption is 1.96×10-6 with SNR of 2.67.