Repetitive DNA sequences with variability in copy number or/and sequence polymorphism can be employed as useful molecular markers to study phylogenetics and identify species/chromosomes when combined ...with fluorescence in situ hybridization （FISH）. Cucumis sativus has three variants, Cucumis sativus L. var. sativus, Cucumis sativus L. var. hardwickii and Cucumis sativus L. var. xishuangbannesis. The phylogenetics among these three variants has not been well explored using cytological landmarks. Here, we concentrate on the organization and distribution of highly repetitive DNA sequences in cucumbers, with emphasis on the differences between cultivar and wild cucumber. The diversity of chromosomal karyotypes in cucumber and its relatives was detected in our study. Thereby, sequential FISH with three sets of multi-probe cocktails （combined repetitive DNA with chromosome-specific fosmid clones as probes） were conducted on the same metaphase cell, which helped us to simultaneously identify each of the 7 metaphase c
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
PbTiO
3
nanoplates were synthesized by a two-step hydrothermal method, and ammonia solution was chosen as a pH-adjusting agent. The effect of ammonia concentration in the second-step precursors, ...Pb-Ti feedstock concentration, reaction temperature, and time on crystallization and morphologies of PbTiO
3
nanocrystals was investigated. The typical single-crystal PbTiO
3
nanoplates with stair-like edge were formed, as the nominal ammonia concentration in the first-step precursors was 8.8 mol/L, the nominal ammonia concentration in the second-step precursors was 4.4 mol/L, the nominal Pb-Ti feedstock concentration was 0.05 mol/L, and they were synthesized at 200°C for 20 h. The thickness of the PbTiO
3
nanoplates was about 45 nm, and the lateral size was about 400 nm. The ammonia solution played an important role in the formation of PbTiO
3
nanoplates, and the growth mechanism of PbTiO
3
nanoplates synthesized by the two-step hydrothermal method in ammonia solution was discussed.
Carbon fibres (CF) have been used in various fields because of their unique properties. However, the oxidation resistance ability of CF is not good enough. The paper discusses the issue of using ...composite plating method to deposit SiC-MoSi
2
-ZrO
2
coating at the surface of CF. The plating factors, including nanoparticle concentration, plating bath temperature, current density, agitation rate and electroplating time, which affect the structure and performance of coating have been discussed. The energy dispersive spectrometer has been applied to test the mass fraction of nanoparticles in the coating. Also, the surface morphology of coated CF has been characterised by a scanning electron microscope and the antioxidation ability of each sample has been tested by the weight difference method. The results indicate that with the proper plating factors, the coating can improve the antioxidation performance of CF and its reinforced composites. The residual weight of coated CF is over 52% after 1400°C oxidation for 15 min.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Design and implementation of automatic gain control loops Zhou Sanwen; Lu Manhong; Huang Jianguo
2012 IEEE International Conference on Signal Processing, Communication and Computing (ICSPCC 2012),
2012-Aug.
Conference Proceeding
Based on the analysis of automatic gain control (AGC) loops, we propose a simple and applicable method for the design and implementation of AGC loops. This proposed method offers the designer an ...effortless way to specify the performance of AGC loops, such as the time constant, as result reducing the huge task of testing before construction. The theoretical designing method is validated by experiment results with close agreement and this method is shown to be very efficient.
Antenna arraying is an efficient method to increase antenna equivalent gain in deep space telemetry tracking and command (TT&C) applications where the signal to noise ratio (SNR) is so low that the ...received signals from the space craft can not be efficiently processed at the receiver. Combining efficiency is the key factor to determine which combining method can be employed for antenna arraying in deep space communications. However, no related researches have been carried out in the literatures. In this paper, detailed theoretic analysis is carried out for the combining efficiency for full-spectrum combining (FSC) methods, which can provide reference for TT&C receiver designers. Analysis results show that the SUMPLE correlation algorithm is optimal in combining efficiency, higher combining efficiency can be gained with higher SNR at each antenna, more antennas, narrower correlation bandwidth and narrower phase difference loop bandwidth.
