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The microstructure, crystal structure and magnetic properties were studied for Sm 0.6 Pr 0.4 Co 5 nanoflakes prepared by surfactant-assisted high-energy ball milling (SAHEBM). Effect of ball-milling time on the c -axis crystallographic alignment, morphology and magnetic properties of Sm 0.6 Pr 0.4 Co 5 nanoflakes was systematically investigated. With increasing milling time from 1 h to 7 h, the intensity ratio between (002) and (111) reflection peaks indicating degree of c -axis crystal texture of the (Sm, Pr)Co 5 phase increases first, peaks at 3 h, then drops again, revealing that the strongest c -axis crystal texture was obtained in the nanoflakes milled for 3 h. On the other hand, the coercivity ( H ci ) of the flakes increases gradually from 1.71 to 14.65 kOe with the increase of ball milling time. As a result, an optimal magnetic properties of M r of 10.23 kGs, H ci of 11.45 kOe and (BH) max of 24.40 MGOe was obtained in Sm 0.6 Pr 0.4 Co 5 nanoflakes milled for 3 h, which also displayed a high aspect ratio, small in-plane size, pronounced (001) out-of-plane texture. [ABSTRACT FROM AUTHOR]

Experimental results of ultralightweight compact heat sinks with open-celled copper (Cu) foams under the impingement of axial fan flows are presented. The thermal resistance of the system and the pressure coefficient on heat sink base plate were measured, focusing on the influences of foam height (Hf ) and impinging distance between fan exit and base plate (H). With the impinging distance fixed at H/D = 0.5 (D being the fan diameter), it is demonstrated that an optimum foam height exists at Hf /D = 0.22, providing the lowest thermal resistance. Furthermore, with the foam height fixed at Hf /D = 0.22, reducing the impinging distance to the foam height level reduces the thermal resistance further. In comparison with conventional aluminum (Al) plate-fin heat sinks under identical flow conditions, the Cu foam heat sinks require only 30% of the weight and 50% of the volume to achieve a similar level of heat dissipation performance. [ABSTRACT FROM PUBLISHER]

Quantitative trait loci (QTLs) and bulked segregant analyses (BSA) identified the major genes Scmv1 on chromosome 6 and Scmv2 on chromosome 3, conferring resistance against sugarcane mosaic virus (SCMV) in maize. Both chromosome regions were further enriched for SSR and AFLP markers by targeted bulked segregant analysis (tBSA) in order to identify and map only markers closely linked to either Scmv1 or Scmv2. For identification of markers closely linked to the target genes, symptomless individuals of advanced backcross generations BC5 to BC9 were employed. All AFLP markers, identified by tBSA using 400 EcoRI/MseI primer combinations, mapped within both targeted marker intervals. Fourteen SSR and six AFLP markers mapped to the Scmv1 region. Eleven SSR and 18 AFLP markers were located in the Scmv2 region. Whereas the linear order of SSR markers and the window size for the Scmv2 region fitted well with publicly available genetic maps, map distances and window size differed substantially for the Scmv1 region on chromosome 6. A possible explanation for the observed discrepancies is the presence of two closely linked resistance genes in the Scmv1 region. [ABSTRACT FROM AUTHOR]

Three previously published resistance gene analogues (RGAs), pic13, pic21 and pic19, were mapped in relation to sugarcane mosaic virus (SCMV) resistance genes (Scmv1, Scmv2) in maize. We cloned these RGAs from six inbreds including three SCMV-resistant lines (D21, D32, FAP1360A) and three SCMV-susceptible lines (D145, D408, F7). Pairwise sequence alignments among the six inbreds revealed a frequency of one single nucleotide polymorphism (SNP) per 33 bp for the three RGAs, indicating a high degree of polymorphism and a high probability of success in converting RGAs into codominant cleaved amplified polymorphic sequence (CAPS) markers compared to other sequences. SNPs were used to develop CAPS markers for mapping of the three RGAs in relation to Scmv1 (chromosome 6) and Scmv2 (chromosome 3), and for pedigree analyses of resistant inbred lines. By genetic mapping pic21 was shown to be different from Scmv2, whereas pic19 and pic13 are still candidates for Scmv1 and Scmv2, respectively, due to genetic mapping and consistent restriction patterns of ancestral lines. [ABSTRACT FROM AUTHOR]