Planificación técnica de compartición de infraestructuras para servicios de difusión y telefonía móvil en el municipio de Mañaria.

[EU]Mañariako udaletxeak herritarren eskaera bat erantzun nahi du, eskaera hori herriko transmisio zentruaren kokapena aldatzean datza. Auzokideek leku urrunago batean kokatzea eskatzen dute. Eskaria erantzuteko, Udaletxeak ikasketa erradioelektrikoa herrian egitea eskatu du, transmisio zentruari kokapen berri bat bilatzeko. Helburua estaldura eta kalitate berdina mantentzea izango da bai telefonia eta telebista zerbitzuetarako. Udaletxeak kokagune batzuk erraztu ditu, non elektrizitate hornikuntza eta sarbidea duten kokapenak. Ikerketa erradioelektrikoa kokapen horietatik hasiko da baina kalitate eta estaldura baldintzak betetzen ez badira, beste leku bat aurkitu beharko da. Proiektu honen amaiera kokapen berri bat aurkituko da non Udaletxeak ezarritako baldintzak betetzen diren.

Vorbereitungen zur Südostatlantischen Fischereikonvention

Bericht über die Sitzung der "Expert Group on the Statistics and Stocks of the Southeast Atlantic Fisheries" (Rom, 21. - 23.9.1970)

Investigation of the spectroscopic properties of Yb3+-doped yttrium lanthanum oxide transparent ceramic

Spectroscopic properties of (Y0.9-xLa0.1Ybx)(2)O-3 transparent ceramic were studied. Two main absorption peaks of the specimen are centered at 940 and 970 nm, which are suitable for InGaAs laser diode pumping. The main emission peaks were located at 1032 and 1075 nm with larger emission cross-section and longer fluorescence lifetime than those of Yb:Y2O3. These properties of (Y0.9-xLa0.1Ybx)(2)O-3 transparent ceramic are favorable to achieve high efficiency and high power laser output. (c) 2007 Elsevier B.V. All rights reserved.

碱性氧化物对铋掺杂硅酸盐玻璃超宽带红外发光的影响

通过冷却熔融法制备出铋掺杂的硅酸盐玻璃，这些玻璃具有覆盖1000—1600nm波段的超宽带红外发光，荧光的半高宽（FWHM）超过200nm；荧光寿命超过400μs；荧光强度随着玻璃碱性的增加而减弱。荧光峰随碱性氧化物的种类不同而移动。除了红外发光，还观察到了发光峰在640m左右的可见发光。640m的可见发光和红外发光有可能来源于同一种发光离子。认为红外发光源于低价态铋离子。铋掺杂的硅酸盐玻璃由于它们的超宽带特性，有可能成为超宽带光纤放大器的增益介质。

Growth and spectral properties of Er:Gd2SiO5 crystal

Er3+ -doped Gd2SiO5 (Er:GSO) single crystal with dimensions of circle divide 35 x 40 mm(3) has been grown by the Czochralski method. The absorption and fluorescence spectra of the Er:GSO crystal were measured at room temperature. The spectral parameters were calculated based on Judd-Ofelt theory, and the intensity parameters Omega(2), Omega(4) and Omega 6 are obtained to be 6.168 x 10(-20), 1.878 x 10(-20), and 1.255 x 10(-20) cm(2), respectively. The emission cross-section has been calculated by Fuechtbauer-Ladenbury formula. (c) 2007 Elsevier B.V. All rights reserved.