We report quantum cascade laser (QCL) master-oscillator power-amplifiers (MOPAs) at 300 K reaching output power of 1.5 W for tapered devices and 0.9 W for untapered devices. The devices display single-longitudinal-mode emission at λ = 7.26 µm and single-transverse-mode emission at TM(00). The maximum amplification factor is 12 dB for the tapered devices.

The maximal value of thermal conductivity κmax of the perfect wurzite GaN crystal containing isotopes of natural abundance is estimated. Our upper limit of κ = 4800 W/Km at Tmax = 32 K is smaller than calculated by Liu and Balandin κ = 6000 W/Km and higher than obtained by Slack et al κ = 3750W/Km. The phenomenological dependence κ ∝ T obtained by Mion et al for the temperature interval 300− 45...

We interpret the reported disagreement between the measured ratio, R 10 , of the W + 1 jet cross-section to the W + 0 jet cross-section at the Tevatron and the Standard Model (SM) prediction, as the effect of interactions mediated by a colour-octet analogue of the W boson, the W 8. The presence of a W 8 with mass O(300) GeV, and with couplings to quarks and gluons of the order of electroweak st...

The aim of this study was to verify the effects of laser therapy performed with Ga-Al-As Diode Lasers (780 nm, 2500 mW) on human cartilage cells in vitro. The cartilage sample used for the biostimulation treatment was taken from the right knee of a 19-year-old patient. After the chondrocytes were isolated and suspended for cultivation, the cultures were incubated for 10 days. The cultures were ...

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Migeon, C. D. & Plager, J. E. (1955). J. clin. Endocrin. 15, 702. Munson, P. L. & Kenny, A. D. (1954). Recent Progr. Hormone Re8. 9, 135. Neunhoeffer, O., Thewalt, K. & Zimmermann, W. (1961). Hoppe-Seyl. Z. 323, 116. Norymberski, J. K. (1952). Nature, Lond., 170, 1074. Werbin, H. & Ong, S. (1954). Analyt. Chem. 26, 762. Zimmermann, W. (1935). Hoppe-Seyl. Z. 233, 257. Zimmermann, W. (1936). Ph.D...

Setting a biocathode potential at -300 mV improved the subsequent performance of an MFC for Cr(VI) reduction compared to a control (no set potential). With this set potential, the startup time was reduced to 19 days, the reduction of Cr(VI) was improved to 19.7 mg/L d, and the maximum power density was increased to 6.4 W/m(3) compared to the control (26 days, 14.0 mg/L d and 4.1 W/m(3)). Set po...