1,351 research outputs found
Emergence of a common generalized synchronization manifold in network motifs of structurally different time-delay systems
No full textR. Suresh and D. V. Senthilkumar acknowledges the support from SERB-DST Fast Track scheme for Young Scientists. M. Lakshmanan (M. L.) has been supported by the DST, Government of India sponsored IRHPA research project. M. L. has also been supported by a DAE Raja Ramanna Fellowship.Peer reviewe
Additive manufacturing applications for metals and composites Advances in civil and industrial engineering (ACIE) book series./ K.R. Balasubramanian, V. Senthilkumar.
No full text"Premier Reference Source" -- taken from front cover.Includes bibliographical references and index."This book provides research on advancing methods and technological developments within additive manufacturing practices. Special attention is paid to the material design of additive manufacturing of parts, the choice of feedstock materials, the metallurgical behavior and synthesis principle during the manufacturing process, and the resulted microstructures and properties, as well as the relationship between these factors"--Chapter 1. Introduction to additive manufacturing -- Chapter 2. Processes and application in additive manufacturing: practices in aerospace, automobile, medical, and electronic industries -- Chapter 3. Additive manufacturing of nickel-based super alloys for aero engine applications : SLM of inconel -- Chapter 4. Insights on laser additive manufacturing of Invar 36 -- Chapter 5. Metal-arc welding technologies for additive manufacturing of metals and composites -- Chapter 6. Wire + arc additive manufacturing of metals: state of the art and challenges -- Chapter 7. Additive manufacturing of multi-material and composite parts -- Chapter 8. Direct laser fabrication of compositionally complex materials: challenges and prospects -- Chapter 9. What is design for additive manufacturing (dfam)? -- Chapter 10. Optimization and simulation of additive manufacturing processes: challenges and opportunities -- a review -- Chapter 11. Simulation applications for industrial and medical products additive manufacturing -- Chapter 12. Multiscale modeling of the laser additive manufacturing process -- Chapter 13. Powder bed fusion additive manufacturing of ni-based superalloys: applications, characteristics, and limitations -- Chapter 14. Laser additive manufacturing in industry 4.0: overview, applications, and scenario in developing economies.1 online resource (xvii, 348 pages)
Influence of the ion size on the stability of the smectic phase of ionic liquid crystals
No full textThe thermotropic phase behavior of ionic liquids and ionic liquid crystals based on novel N-alkyl-3-methylpyridinium halides, trihalides and dichloroiodates was experimentally studied by polarized optical spectroscopy (POM) and differential scanning calorimetry (DSC) as well as by molecular dynamics (MD) simulation. In the experiments, the existence and thermal range of stability of the smectic phase of these ionic liquid crystals are found to strongly depend on the volume ratio between the cation and anion, that is their relative size. Only compounds with a relatively large volume ratio of the cation to anion, i.e., those with longer cationic alkyl chains and monoatomic halide anions, have a stable smectic A phase. Both melting points and clearing points increase with such a ratio. The MD simulation results qualitatively agree very well with the experimental data and provide molecular details which can explain the experimentally observed phenomena: the stronger van der Waals interactions from the longer alkyl chains and the stronger electrostatic interactions from the smaller anions with a higher charge density increase the stability of both the crystal phase and the smectic phase; this also prevents the ionic layers from easily mixing with the hydrophobic regions, a mechanism that ultimately leads to a nanosegregated isotropic liquid phase
Design of mini phantom and measurement of cobalt-60 beam data parameters
No full textLow cost mini phantoms were fabricated indigenously with different water equivalent material such as polymethyl methacrylate and Bee′s wax of different shapes (with dome top surface and flat top surface). The beam parameters of the Co-60 machine, such as head scatter correction factor (S h ), phantom scatter correction factor (S P ), total scatter correction factor (S C,P ), collimator exchange effect were measured. Output ratio measurements were taken for both mini phantom and water phantom for different square and rectangular field sizes. Normalized output ratios were compared with ESTRO published values and (Storchi and Van Gasteren) S and G data. The percentage of variation between the measured and the literature values is about 0.7%. Collimator exchange effect were measured for water and mini phantom for different field size, were compared with ESTRO value. This was found to be 0.5% and 1.0% respectively. Phantom scatter correction factors were calculated for square and rectangular filed sizes; this was compared with ESTRO values, found to be 0.7% for square and 1.0% for rectangular filed size. It was also noted that there were no appreciable variation observed in ion chamber readings of different materials of mini phantoms for dome and flat surfaces. Mini phantom measurements were done for all types of phantoms and the measured values were compared with the existing data and they were in good agreement with the published values
Audio Streaming Using Li-FI Communication
No full textIn Wireless communication, Wi-Fi is the most versatile and effective technology which compact with radio frequencies for data transmission. But because of multiple accesses, Wi-Fi is facing many challenges namely capacity, availability, efficiency and security. The Wi-Fi emits radio waves which are very harmful to the patients and the radio waves interpret the medical instruments. This paper focuses on developing a light fidelity (Li-Fi) based system and analyzing its performance. This protocol can be adapted where radio waves are restricted, such as in airplane hospitals, and in some research facilities. Noticeable Light Communication (VLC) has increased extraordinary enthusiasm for the most recent decade because of the quick improvements in Light Emitting Diodes (LEDs) manufacture Li-Fi is a novel technology for high-density wireless data transfer relieving no radio interferences in confined areas so it can be used in biosensors to measure various health parameters. This technology envisions a future where data for laptops, smartphones, and tablets will be transmitted in an economic and eco-friendly medium of light in the room
Entomopathogenic Fungi for the Management of Calopepla leayana on Gmelina arborea
No full textEntomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae were isolated and identified as natural pathogens of Calopepla leayana. Both the species of fungi were effective against the larval and adult stages of C. leayana causing white and green muscardine diseases respectively. It was also found that B. bassiana was more pathogenic to the pest as compared to M. anisopliae. The susceptibility of larvae and adults was negatively associated with the age and positively associated with the fungal spore concentration. In all the stages from I instar to adult, the highest mortality was observed in 10% of 1x109 spores/ml concentration of B. bassiana among 1, 2.5, 5 & 10% of 1x109 spores/ml concentration. It was also reflected in probit analysis that the concentration of spores required to kill fifty percent of the population was ranges from 0.09% to 5.98% of 1x109 spores/ml concentration of B. bassiana and 1.02% to 9.72% of 1x109 spores/ml concentration of M. anisopliae. The larvae of I instar have shown highest mortality, which gradually decreased with the increase in age or decrease in the concentration of fungal spores. Mass production of B. bassiana using different substrates was attempted to harvest ample amount of spores. This study revealed that spore production was directly proportional to the mycelial weight and incubation period. From the seven substrates tested, wheat flour was identified as one of the suitable substrates for the mass production of B. bassiana. A field trial was conducted to test their efficacy under field conditions. 72-93% mortality was observed in field conditions.-----------------------------------------------------------------------------------------------------Division of Bioprospecting, Institute of Forest Genetics and Tree Breeding, Coimbatore-641002, Tamilnadu, India*Corresponding author, Email: [email protected] This Article As: N. Senthilkumar and S. Murugesan. 2010. Entomopathogenic Fungi for the Management of Calopepla leayana on Gmelina arborea. J. Ecobiotechnol. 2(3): 01-0
Experimental realization of strange nonchaotic attractors in a nonlinear series LCR circuit with nonsinusoidal force
No full textWe have identified several prominent routes, namely, fractalization, fractalization followed by intermittency, intermittency and Heagy-Hammel routes, for the birth of strange nonchaotic attractors (SNAs) in a quasiperiodically forced electronic system with nonsinusoidal (square wave) force as one of the quasiperiodic forces [Senthilkumar et al., 2008]. In addition, a new bubbling route has also been identified in this circuit. Although some of these prominent routes have been reported experimentally [Thamilmaran et al., 2006] in a quasiperiodically forced electronic circuit with both the forcings as sinusoidal forces, experimental identification of all these routes is reported here in a quasiperiodically forced electronic circuit with one of the forcings as a nonsinusoidal (square wave) force. The birth of SNAs by these routes are characterized from both the experimental and numerical data by the maximal Lyapunov exponents and their variance, Poincare maps, Fourier amplitude spectra, spectral distribution functions and the distribution of finite-time Lyapunov exponents
Peters′ Anomaly-Anaesthetic Management
No full textPeters′ anomaly occurs as an isolated ocular abnormality, in association with other systemic abnormalityor one component of a number of well-defined syndromes. We review our experience of anaesthetic management and systemic association of peters′ anomaly. To the best of our knowledge there are no reports in the literature of Peters′ anomaly with relevant to anaesthesia
Awareness of medico-legal issues among medical and dental college health professionals
No full textIntroduction: The changing doctor-patient relationship and commercialization of modem medical practice has affected the practice of medicine. The fundamental values of medicine insist that the doctors should be aware about the various medico-legal issues which help in proper recording of medical management details. Aim: To evaluate the knowledge on Medico-legal Issues among Medical and Dental College Health Professionals of Meenakshi University (MAHER), Tamilnadu. Materials & Method: A cross-sectional survey was conducted among health professionals of Meenakshi University (MAHER), Tamilnadu. A total o f320 health professionals (163 medical and 157 dental) participated in the study. A structured, closed ended, self-administered questionnaire was used for collection of data. Chi-square test was used to compare the awareness of medico-legal issues between medical and dental health professionals. Results: Among the 320 health professionals, 87.4% of medical and 76.1% of dental professionals were aware about the informed consent, 18.8% of medical and 5.7% of dental professionals had awareness about COPRA and only 14.3% of medical and 7.6% of dental professionals had awareness regarding the Medico-legal programs/courses. Conclusions: The results illustrated that the participants had little awareness on medico-legal issues. Hence there is an urgent need to update the understanding of these issues to be on a legally safer side
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