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Acquisition, Processing and Image Generation System for Camera Data Onboard Spacecraft
C.V.R Subbaraya Sastry,G.S Narayan Rao,N Ramakrishna,V.K Hariharan International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.3
The primary goal of any communication spacecraft is to provide communication in variety of frequency bands based on mission requirements within the Indian mainland. Some of the spacecrafts operating in S-band utilizes a 6m or larger aperture Unfurlable Antenna (UFA for S-band links and provides coverage through five or more S-band spot beams over Indian mainland area. The Unfurlable antenna is larger than the satellite and so the antenna is stowed during launch. Upon reaching the orbit, the antenna is deployed using motors. The deployment status of any deployment mechanism will be monitored and verified by the telemetered values of micro-switch position before the start of deployment, during the deployment and after the completion of the total mechanism. In addition to these micro switches, a camera onboard will be used for capturing still images during primary and secondary deployments of UFA. The proposed checkout system is realized for validating the performance of the onboard camera as part of Integrated Spacecraft Testing (IST) conducted during payload checkout operations. It is designed for acquiring the payload data of onboard camera in real-time, followed by archiving, processing and generation of images in near real-time. This paper presents the architecture, design and implementation features of the acquisition, processing and Image generation system for Camera onboard spacecraft. Subsequently this system can be deployed in missions wherever similar requirement is envisaged.
Somatic Mutations in TSC1 and TSC2 Cause Focal Cortical Dysplasia
Lim, J.S.,Gopalappa, R.,Kim, S.H.,Ramakrishna, S.,Lee, M.,Kim, W.i.,Kim, J.,Park, S.M.,Lee, J.,Oh, J.H.,Kim, H.D.,Park, C.H.,Lee, J.S.,Kim, S.,Kim, D.S.,Han, J.M.,Kang, H.C.,Kim, H.(.,Lee, J.H. University of Chicago Press [etc.] 2017 American journal of human genetics Vol.100 No.3
<P>Focal cortical dysplasia (FCD) is a major cause of the sporadic form of intractable focal epilepsies that require surgical treatment. It has recently been reported that brain somatic mutations in MTOR account for 15%-25% of FCD type II (FCDII), characterized by cortical dyslamination and dysmorphic neurons. However, the genetic etiologies of FCDII-affected individuals who lack the MTOR mutation remain unclear. Here, we performed deep hybrid capture and amplicon sequencing (read depth of 100 x-20,012 x) of five important mTOR pathway genes-PIK3CA, PIK3R2, AKT3, TSC1, and TSC2-by using paired brain and saliva samples from 40 FCDII individuals negative for MTOR mutations. We found that 5 of 40 individuals (12.5%) had brain somatic mutations in TSC1 (c.64C>T [p.Arg22Trp] and c.610C>T [p.Arg204Cys]) and TSC2 (c.4639G>A [p.Va11547I1e]), and these results were reproducible on two different sequencing platforms. All identified mutations induced hyperactivation of the mTOR pathway by disrupting the formation or function of the TSC1TSC2 complex. Furthermore, in utero CRISPR-Cas9-mediated genome editing of Tsc1 or Tsc2 induced the development of spontaneous behavioral seizures, as well as cytomegalic neurons and cortical dyslamination. These results show that brain somatic mutations in TSC1 and TSC2 cause FCD and that in utero application of the CRISPR-Cas9 system is useful for generating neurodevelopmental disease models of somatic mutations in the brain.</P>
Vikas Kumar Singh,Priti Upadhyay,Pallavi Sinha,Ashish Kumar Mall,Ranjith K. Ellur,Atul Singh,Sanjay K.Jaiswal,Sunil Biradar,S. Ramakrishna,R.M. Sundaram,Ilyas Ahmed,B. C. Viraktamath,C. Kole,Sukhpal S 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.1
A total of six TGMS (thermosensitive genic male sterile lines) and nine pollinator lines were subjected to molecular characterization using 48 genome-wide SSR (simple sequence repeat) markers. Cluster analysis revealed clear differentiation among the TGMS lines according to their source of origin. The SSR-based genetic distance between the hybrids of the parental lines ranged from 0.36to 0.79 suggesting a high degree of genetic divergence. Among a set of 54 hybrids generated using parental lines, 32 showed better parent heterosis (+21.7%) while 19 showed mid-parent heterosis (+15.0%). For the trait yield per plant genetic distance (GD) was negatively correlated with F1 performance (r = -0.202), mid-parent heterosis (r = -0.325*; P < 0.05), and better parent heterosis (r = -0.261), while it was positively correlated with specific combining ability (r = 0.042). Based on the grouped genetic distance (GGD),the hybrid combinations were divided into four groups. The GGD showed linear correlation with hybrid performance within the group (GGD = 40 - 50: r = -0.07; GGD = 70 - 80: r = 0.32). This information can be utilized in the development of higher yielding,two-line rice hybrids through selection of intermediately diverse parental lines using GGD.
Singh, Vikas Kumar,Upadhyay, Priti,Sinha, Pallavi,Mall, Ashish Kumar,Ellur, Ranjith K.,Singh, Atul,Jaiswal, Sanjay K.,Biradar, Sunil,Ramakrishna, S.,Sundaram, R.M.,Ahmed, Ilyas,Viraktamath, B.C.,Kole, 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.1
A total of six TGMS (thermosensitive genic male sterile lines) and nine pollinator lines were subjected to molecular characterization using 48 genome-wide SSR (simple sequence repeat) markers. Cluster analysis revealed clear differentiation among the TGMS lines according to their source of origin. The SSR-based genetic distance between the hybrids of the parental lines ranged from 0.36 to 0.79 suggesting a high degree of genetic divergence. Among a set of 54 hybrids generated using parental lines, 32 showed better parent heterosis (+21.7%) while 19 showed mid-parent heterosis (+15.0%). For the trait yield per plant genetic distance (GD) was negatively correlated with $F_1$ performance (r = -0.202), mid-parent heterosis (r = $-0.325^*$; P < 0.05), and better parent heterosis (r = -0.261), while it was positively correlated with specific combining ability (r = 0.042). Based on the grouped genetic distance (GGD), the hybrid combinations were divided into four groups. The GGD showed linear correlation with hybrid performance within the group (GGD = 40 - 50: r = -0.07; GGD = 70 - 80: r = 0.32). This information can be utilized in the development of higher yielding, two-line rice hybrids through selection of intermediately diverse parental lines using GGD.
Ramakrishna N. Hegde,Srikanth S. Rao,R. P. Reddy 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
The pool boiling characteristics of dilute dispersions of CuO nanoparticles in water were studied at atmospheric pressure on a vertical heating surface. Experimental investigation of different weight concentrations of nanoparticles revealed significant enhancement in heat flux and deterioration in pool boiling. Out of many reasons, nanoparticles coating the heater surface was believed to be the reason behind this. Subsequent inspection of the heater surface showed nanoparticles coating the surface, forming a porous layer. To substantiate the nanoparticle deposition and its effect on heat flux, an investigation was performed by measuring the surface roughness of the heater surface before and after the experiment. While SEM images of the heater surface revealed nanoparticle deposition, measurement of surface roughness of the heater surface confirmed it. Formation of the porous layer on the heater surface as revealed by SEM images provided an excellent location for nucleation sites enhancing heat transfer. However, deterioration in nucleate boiling at different weight concentrations indicated some phenomenon is working behind this
N. S. Anas,M. Ramakrishna,R. Vijay 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.2
The efect of dispersion of carbon nanotubes (CNT) and Ni coated CNT in Al alloy (AA) on the evolution of microstructureand resultant mechanical properties are investigated. Al alloy (Al–4.4Cu–0.5Mg), Al alloy–CNT (AC) and Al alloy–Ni coatedCNT (ANC) composites were produced from elemental powders by mechanical milling (MM) followed by hot extrusion. Unlike CNT–containing Al or Al alloy milled powders, Al4C3 phase formed during milling of ANC powder. The formationof Al4C3 is due to the dissolution of Ni present on CNT surface in Al alloy during MM, thereby, creating defects on CNTthat promoted Al4C3 formation. AC and ANC samples exhibited larger size and lower number density of θ′ precipitateswhen compared to AA. The larger size of θ′ precipitates is due to the presence of ultra–fne grains, reduced quenched–invacancies and higher dislocation density that promoted the nucleation resulting in enhanced precipitation and growth kinetics. The strengths of AC and ANC samples are higher when compared to CNT-free AA, and ANC exhibited highest yieldstrength of 567 MPa. However, the ductility of ANC sample is not improved due to the presence of Al7Cu4Ni phase, whichpromoted crack initiation.
Generation of a quasi-monoergetic proton beam from laser-irradiated sub-micron droplets (8 pages)
Ter-Avetisyan, S.,Ramakrishna, B.,Prasad, R.,Borghesi, M.,Nickles, P.V.,Steinke, S.,Schnurer, M.,Popov, K.I.,Ramunno, L.,Zmitrenko, N.V. AMERICAN INSTITUTE OF PHYSICS 2012 Physics of plasmas Vol.19 No.7