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排序方式: 共有94条查询结果,搜索用时 234 毫秒
1.
Barak Ratzker Avital Wagner Bar Favelukis Sharone Goldring Sergey Kalabukhov Nachum Frage 《Journal of the European Ceramic Society》2021,41(6):3520-3526
Doped transparent ceramics with high optical quality can serve as materials for photonic applications such as laser gain media. In that regard, transparent polycrystalline alumina has potential for high-power applications due to its excellent physical and chemical properties, combined with unique doping possibilities. However, optical birefringence of Al2O3 crystals make achieving sufficiently high optical transmittance a processing challenge. In the present study, we demonstrated fabrication of highly transparent 0.5 at.% Cr:Al2O3 ceramics by high-pressure spark plasma sintering (HPSPS). The optical properties of these polycrystalline ruby ceramics were analyzed in order to assess possible laser operation (at 694.3 nm). The obtained ceramics exhibit high in-line transmittance (~72.5 % at 700 nm), equivalent to a scattering coefficient of 2.15 cm?1, and characteristic ruby photoluminescence. The theoretically estimated lasing threshold and percentage of absorbed pump power indicate that such ruby ceramic lasers could operate at reasonable thresholds of 80?225 mW with short lengths of 0.5?5 mm. Thus, HPSPS is a promising method for producing laser-quality doped transparent ceramics for compact laser systems. 相似文献
2.
S. Hayun V. Paris M.P. Dariel N. Frage E. Zaretzky 《Journal of the European Ceramic Society》2009,29(16):3395-3400
Spark plasma sintering (SPS) has become a popular technique for the densification of covalent ceramics. The present investigation is focused on the static mechanical properties and dynamic compressive behavior of SPS consolidated boron carbide powder without any sintering additives. Fully dense boron carbide bodies were obtained by a short high temperature SPS treatment. The mechanical properties of the SPS-processed material, namely hardness (32 GPa), Young modulus (470 GPa), fracture toughness KC (3.9–4.9 MPa m0.5), flexural strength (430 MPa) and Hugoniot elastic limit (17–19 GPa) are close or even better than those of hot-pressed boron carbide. 相似文献
3.
Naum Frage Sergey Kalabukhov Nataliya Sverdlov Vladimir Ezersky Moshe P. Dariel 《Journal of the European Ceramic Society》2010,30(16):3331-3337
Nano-size YAG powder co-mixed with 0.25 wt.% LiF was used to fabricate transparent polycrystalline YAG specimens by means of the Spark Plasma Sintering (SPS) technique. The presence of the LiF additive in the initial nano-powder allows obtaining fully dense disc shaped (up to 4 mm thick) transparent specimens at the outcome of a 2 h treatment at 1300 °C. The presence of LiF plays a key role in the mass transport related effects during the densification of YAG to full density and also in the elimination of the residual carbon contamination, allowing reaching a level of optical transmittance close to the theoretical value. 相似文献
4.
Zilla Sinuany-Stern Nachum Finger Elias Kligler 《Computers, Environment and Urban Systems》1986,11(4)
This paper provides a model for finding the optimal thinning policy in a pine forest (Pinus halepensis) in Israel. The model simulates the growth of a pine forest stand for timber, under various thinning policies. The annual growth functions are estimated via polynomial regression analysis. The dependent variable is the timber volume of the stand and the explanatory variable is the mean growing space per tree over time. The observations were made over the life span of five experimental parcels in a pine forest in Israel. 相似文献
5.
E. V. Sokolova N. R. Frage Yu. G. Gurevich V. I. Chumanov 《Powder Metallurgy and Metal Ceramics》1991,30(1):60-63
Translated from Poroshkovaya Metallurgiya, No. 1(337), pp. 68–72, January, 1991. 相似文献
6.
We explore how different proof orderings induce different notions of saturation and completeness. We relate completion, paramodulation, saturation, redundancy elimination, and rewrite system reduction to proof orderings. 相似文献
7.
Naum Frage Shahar Cohen Shay Meir Sergei Kalabukhov Moshe Peter Dariel 《Journal of Materials Science》2007,42(9):3273-3275
8.
f2 Phage, attenuated Polio I (LSC) strain introduced daily to a 350 l. experimental oxidation pond showed no decrease in bacterial viruses f2 or other coliphages or Polio I strain.Ratios of coliphages to human enteric viruses ranged in flood waters from concentrations as low as 1:1 to as high as 103:1; in wastewater at various seasons the ratio was 105:1; in trickling filter effluents in winter it was 104:1; in spring 105:1, in summer and fall 104:1, in oxidation pond effluents in winter 103:1; in spring 104:1; and in summer and fall 103:1. Out of three epidemics in small communities caused by failure of water supply, coliphages were found to be positive. At the same time only two samples of human enteric viruses were positive (the third was contaminated with yeasts).Chlorination experiments using the experimental oxidation pond showed that f2 was most resistant, MS2 was very resistant, and coliphages were more resistant than attenuated Polio I virus. Experiments with the oxidation pond effluents showed that coliphages were at least as or even more resistant to chlorine than human enteric viruses. 相似文献
9.
10.
M. Aizenshtein N. Froumin N. Frage 《Journal of Materials Engineering and Performance》2012,21(5):655-659
TiB2 among other borides like ZrB2 and HfB2 represents a unique class of ceramics, which displays good wetting by liquid metals, such as Cu and Au, without chemical
interaction that may be detected by conventional characterization techniques. The nature of the wetting in these systems is
commonly attributed to the “metallic-like” character of borides. In this study, improved wetting of TiB2 by Cu and Au (50° and 15°, respectively) was confirmed and evidence of a limited chemical interface interaction was observed
using TEM analysis. Moreover, it was shown that the addition of B to Au and Cu improves wetting. It was suggested that not
only “metallic-like” character of TiB2 but also the chemical interaction stands behind good wetting in these systems. 相似文献