Application of time modulation in the synthesis of sum and difference patterns by using linear arrays

2006 ◽  
Vol 48 (5) ◽  
pp. 829-832 ◽  
Author(s):  
J. Fondevila ◽  
J. C. Brégains ◽  
F. Ares ◽  
E. Moreno
Keyword(s):  
Linear Arrays ◽  
Time Modulation

Optimizing uniformly excited linear arrays through time modulation

2004 ◽  
Vol 3 ◽  
pp. 298-301 ◽  
Author(s):  
Fondevila ◽  
Bregains ◽  
Ares ◽  
Moreno
Keyword(s):  
Linear Arrays ◽  
Time Modulation

scholarly journals Synthesis of Dual-Beam Patterns by Exploiting Time-Modulation in Unequally Spaced Linear Arrays

2021 ◽  
Vol 30 (4) ◽  
pp. 646-653
Author(s):  
S. Patra ◽  
S. K. Mandal ◽  
G. K. Mahanti ◽  
N. N. Pathak
Keyword(s):  
Linear Arrays ◽  
Time Modulation ◽  
Unequally Spaced ◽  
Dual Beam ◽  
Beam Patterns

scholarly journals Shared Aperture Multibeam Forming of Time-Modulated Linear Array

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Li-juan Sun ◽  
Zhen-kai Zhang ◽  
Hamid Esmaeili Najafabadi
Keyword(s):  
Linear Array ◽  
Scaling Factor ◽  
Linear Arrays ◽  
Time Modulation ◽  
Novel Technique ◽  
De Algorithm ◽  
Line Array ◽  
Crossover Probability ◽  
Adaptive Crossover ◽  
Time Sequences

A novel technique is proposed in this paper for shared aperture multibeam forming in a complex time-modulated linear array. First, a uniform line array is interleaved randomly to form two sparse array subarrays. Subsequently, the theory of time modulation for linear arrays is applied in the constructed subarrays. In the meantime, the switch-on time sequences for each element of the two subarrays are optimized by an optimized differential evolution (DE) algorithm, i.e., the scaling factor of the sinusoidal iterative chaotic system and the adaptive crossover probability factor are used to enhance the diversity of the population. Lastly, the feasibility of the new technique is verified by the comparison between this technique and the basic multibeam algorithm in a shared aperture and the algorithm of iterative FFT. The results of simulations confirm that the proposed algorithm can form more desired beams, and it is superior to other similar approaches.

Linear Arrays of Helical Polyribosomes in Cells Exposed to Antitumor Drug Vincristine Sulfate

1969 ◽  
Vol 27 ◽  
pp. 358-359
Author(s):  
Awtar Krishan
Keyword(s):  
Close Association ◽  
Annulate Lamellae ◽  
Large Array ◽  
Vincristine Sulfate ◽  
Linear Arrays ◽  
Golgi Membranes ◽  
Related Drug ◽  
Drug Leads ◽  
Lethal Doses ◽  
Vinblastine Sulfate

Earle's L-929 fibroblasts treated with mitosis-arresting but sub-lethal doses of vinblastine sulfate (VLB) show hypertrophy of the granular endoplasmic reticulum and annulate lamellae. Exposure of the cells to heavier doses of vincristine sulfate (VCR), a VLB-related drug, leads to the accumulation of large amounts of helical polyribosomes, Golgi membranes and crystals in the cytoplasm. In many of these cells a large number of helical polyribosomes are arranged in prominent linear rows, some of which may be up to 5 micrometers in length. Figure 1 shows a large array of helical polyribosomes near a crystalline mass (CRS) in an Earle's L-929 fibroblast exposed to VCR (5ϒ/ml.) for 3 hours At a higher magnification, as seen in figure 2, the helical polyribosomes are seen arranged in parallel rows. In favorably cut sections, a prominent backbone like "stalk" of finely granular material, measuring approximately 300Å in width is seen in close association with the linear rows of helical polyribosomes.

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