Manifold Regularized Correlation Object Tracking

In this paper, we propose a manifold regularized correlation tracking method with augmented samples. To make better use of the unlabeled data and the manifold structure of the sample space, a manifold regularization-based correlation filter is introduced, which aims to assign similar labels to neighbor samples. Meanwhile, the regression model is learned by exploiting the block-circulant structure of matrices resulting from the augmented translated samples over multiple base samples cropped from both target and nontarget regions. Thus, the final classifier in our method is trained with positive, negative, and unlabeled base samples, which is a semisupervised learning framework. A block optimization strategy is further introduced to learn a manifold regularization-based correlation filter for efficient online tracking. Experiments on two public tracking data sets demonstrate the superior performance of our tracker compared with the state-of-the-art tracking approaches

Synthesis of nanosized a-Al2O3 powders and fabrication of nanocrystalline alumina ceramics

Nano-a-Al2O3 powders have been synthesized through the new developed sol-gel method.Through control of the precursor structure and in combination with addition of nanosized a-Al2O3 or diaspore seeds, the phase transformation temperature to corundum is lowered to below 900 °C. Diaspore shows more seeding efficiency. While seeding with 10 wt.% a-Al2O3 leads to theformation of 40-80 nm a-Al2O3 particles after calination of alumina gels at 900 °C for 1 h, theseeding with the same amount of diaspore lowers the phase transformation temperature to 850 °C, which the resulted powders are asociated with a higher specific area of 31.3 m²/g and a smaller particle size of 30-60 nm. Due to the low phase transformation temperatures the synthesized nano-a-Al2O3 powders agglomerate weakly and can be easily redispersed. The synthesized nano-a-Al2O3 powders show a high sinteractivity and can be sintered to a high density with a submicrometer grain structure below 1300 °C

Yellow Head Virus: Transmission and Genome Analyses

Yellow head virus (YHV) is an important pathogen to shrimp aquaculture. Among 13 species of naturally YHV-negative crustaceans in the Mississippi coastal area, the daggerblade grass shrimp, Palaemonetes pugio, and the blue crab, Callinectes sapidus, were tested for potential reservoir and carrier hosts of YHV using PCR and real time PCR. The YHV replicated in the daggerblade grass shrimp, and was still detectable on 36 d post-inoculation, causing 8% mortality after injection. However, YHV did not replicate in the blue crab. These data suggest that the daggerblade grass shrimp could act as a reservoir host for YHV. Storage conditions of hemolymph samples containing YHV may result in a decline of virus or exhibit false-negative results in viral detection. The YHV-positive hemolymph was stored at either 4 or 25 °C for a 6-d period, the viral load number at 4 °C was not significantly different from that stored at 25 °C. The only difference was between the samples stored for 6-d at either 4 or 25 °C and those stored at -80 °C, suggesting that shrimp hemolymph can be stored at either 4 or 25 °C for 3-5 d without a significant reduction in measured YHV RNA levels. The whole genome of 3 isolates in Penaeus monodon obtained from Thailand in 1992, 1995, and 1999 was sequenced. The only indel event in the coding region was located in the 5\u27 end of ORFla, containing a segment of 12 nt. Other indels occurred in the non-coding region. The 3\u27 untranslated region (UTR) forms a putative pseudoknot with an octonucleotide motif being the counterpart in the 3\u27 UTR of Coronavims. The phytogeny of Nidovirales was reconstructed based on 48 nidovirus proteome sequences, demonstrating a consistency with the contemporary phytogeny. Recombination in RNA viruses plays a major role in virus diversity and evolution. Seven recombination events were detected among the 4 YHV genomes with high statistical support. The divergence times for the most recent common ancestor of the YHV lineage were dated back to 1970-1980s based on 3 recombination-free data sets. These values were consistent with shrimp culture practice in Asia