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Alluri, Nagamalleswara Rao,Selvarajan, Sophia,Chandrasekhar, Arunkumar,Saravanakumar, Balasubramaniam,Lee, Gae Myoung,Jeong, Ji Hyun,Kim, Sang-Jae Elsevier 2017 ENERGY Vol.118 No.-
<P><B>Abstract</B></P> <P>A laterally aligned flexible composite linear worm-based piezoelectric energy harvester made up of piezoelectric barium titanate nanoparticles and a three dimensional gel network of calcium alginate biopolymer was aimed to harness the low frequency mechanical energy. It is highly desirable to fabricate innovative micro/nanostructures for high performance energy harvesting beyond the conventional thin films, and small scale fabrication of nanowires (or rods). The open circuit voltage of a single composite worm-based energy harvester (diameter ≈ 550 μm, length ≈ 2.5 cm) increases up to 5 times by increasing the frequency of mechanical load (11 N) from 3 to 20 Hz. Similarly, 1.5 times voltage increment was observed by increasing the length of the composite worm from 1.5 to 3.5 cm upon the bio-mechanical hand force. The energy harvester can function as an efficient portable/wearable self-powered device due to its good flexibility, and multiple lengths of composite linear worms can be utilized to drive low-power electronic devices. In this work, the composite worms were prepared by an ionotropic gelation approach, which is eco-friendly, non-toxic, having low processing temperature/time, and potential for cost-effective, large-scale fabrication, making it suitable for low frequency based self-powered devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Portable energy harvester was developed using composite linear worm structure. </LI> <LI> Real time power generating shoe insole was demonstrated by two energy harvesters. </LI> <LI> Energy harvested from the applied mechanical load, air and human body motions. </LI> <LI> The relation between composite worm length and generated energy was identified. </LI> <LI> Eco-friendly, Mass production of worms developed by ionotropic gelation method. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Alluri, Nagamalleswara Rao,Selvarajan, Sophia,Chandrasekhar, Arunkumar,Balasubramaniam, Saravanakumar,Jeong, Ji Hyun,Kim, Sang-Jae Elsevier 2016 Sensors and actuators. B Chemical Vol.237 No.-
<P><B>Abstract</B></P> <P>Multifunctional biopolymer-piezoelectric composite worm structures (wavy and linear) derived by ionotropic gelation technique is fundamentally reported. Mass production of composite wavy pattern worms (CWPWs) enable high energy conversion from low frequency mechanical energy to electrical energy, tunable piezoelectricity by tailored length dependent CWPWs, weight ratio of piezoelectric nanoparticles. Interestingly we found that, the peak–peak voltage and current decreases around 87% and 71% for CWPW devices when the CWPWs length decreased to 56.4% (L=1.95 to 0.85cm) respectively. We also tested, the pH dependent conductivity of composite linear worm (CLW) for clinical, food monitoring applications. Next, we demonstrate the generated piezoelectric potential of CWPW device holds as a promising independent power source unit to drive the CLW sensor under different pH solutions. The proposed work is non-invasive, flexible with robustness in long-term effective usage, biocompatibility, and battery-less operation for self powered biosensor in theranostics, blood pH measurement.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel piezoelectric composite wavy, linear worm structure has been developed for the first time. </LI> <LI> Energy harvesting and pH sensing functionality of composite worms has been reported. </LI> <LI> Length dependent output of CWPW structures and conversion of bio-mechanical to electrical energy has been studied. </LI> <LI> Developed self-powered pH sensor using CLW and CWPW structures. </LI> <LI> Worms are suitable for wearable, portable power sources without any storage components. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Intraoperative Neuromonitoring During Lateral Lumbar Interbody Fusion
Ram Alluri,Jung Kee Mok,Avani Vaishnav,Tara Shelby,Ahilan Sivaganesan,Raymond Hah,Sheeraz A. Qureshi 대한척추신경외과학회 2021 Neurospine Vol.18 No.3
Objective: To review the evidence for the use of electromyography (EMG), motor-evoked potentials (MEPs), and somatosensory-evoked potentials (SSEPs) intraoperative neuromonitoring (IONM) strategies during lateral lumbar interbody fusion (LLIF), as well as discuss the limitations associated with each technique. Methods: A comprehensive review of the literature and compilation of findings relating to clinical studies investigating the efficacy of EMG, MEP, SSEP, or combined IONM strategies during LLIF. Results: The evidence for the use of EMG is mixed with some studies demonstrating the efficacy of EMG in preventing postoperative neurologic injuries and other studies demonstrating a high rate of postoperative neurologic deficits with EMG monitoring. Multimodal IONM strategies utilizing MEPs or saphenous SSEPs to monitor the lumbar plexus may be promising strategies based on results from a limited number of studies. Conclusion: The use of traditional EMG during LLIF remains without consensus. There is a growing body of evidence utilizing multimodal IONM with MEPs or saphenous SSEPs demonstrating a possible decrease in postoperative neurologic injuries after LLIF. Future prospective studies, with clear definitions of neurologic injury, that evaluate different multimodal IONM strategies are needed to better assess the efficacy of IONM during LLIF.
다단 성형 공정 시 고-Mn 강의 타원형 용기 헤드에서의 변형률 분포: 유한요소해석
Preetham Alluri,Lalit Kaushik,최시훈 한국소성∙가공학회 2023 소성가공 : 한국소성가공학회지 Vol.32 No.5
ISO 21029 cryogenic vessel is used to transport cryogenic fluids. High-manganese steel (High-Mn steel) is widely regarded as suitable for use at cryogenic temperatures. The conventional way of manufacturing an ellipsoidal vessel head involves incremental stretching, followed by a spinning process. In this study, an alternative method for forming an ellipsoidal vessel head was proposed. Finite element analysis (FEA) was used to theoretically examine the strain evolution during a multi-stage forming process, which involved progressive stretching, deep drawing, and spinning of High-Mn steel. The distribution of effective strain and strain components were analyzed at different regions of the formed part. The FEA results revealed that only normal strains were evident in the dished region of the vessel head due to the stretching process. However, the flange region experienced complex strain evolution during the subsequent deep drawing and spinning process.