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465 results on '"Kumar, Mahesh"'

16. Coronary intravascular lithotripsy in contemporary practice: challenges and opportunities in coronary intervention

Author

Ankush Gupta, Abhinav Shrivastava, Jaskaran Singh Dugal, Sanya Chhikara, Rajesh Vijayvergiya, Navreet Singh, Ajit Chandrakant Mehta, Nalin Kumar Mahesh, and Ajay Swamy

Subjects
Diseases of the circulatory (Cardiovascular) system, RC666-701
Abstract

Percutaneous coronary intervention (PCI) of calcified coronary arteries is associated with poor outcomes. Poorly modified calcified lesion hinders the stent delivery, disrupts drug-carrying polymer, impairs drug elution kinetics and results in under-expanded stent (UES). UES is the most common cause of acute stent thrombosis and in-stent restenosis after PCI of calcified lesions. Angiography has poor sensitivity for recognition and quantification of coronary calcium, thereby mandating the use of intravascular imaging. Intravascular imaging, like intravascular ultrasound and optical coherence tomography, has the potential to accurately identify and quantify the coronary calcium and to guide appropriate modification device before stent placement. Available options for the modification of calcified plaque include modified balloons (cutting balloon, scoring balloon and high-pressure balloon), atherectomy devices (rotational atherectomy and orbital atherectomy) and laser atherectomy. Coronary intravascular lithotripsy (IVL) is the newest addition to the tool box for calcified plaque modification. It produces the acoustic shockwaves, which interact with the coronary calcium to cause multiplanar fractures. These calcium fractures increase the vessel compliance and result in desirable minimum stent areas. Coronary IVL has established its safety and efficacy for calcified lesion in series of Disrupt CAD trials. Its advantages over atherectomy devices include ease of use on workhorse wire, ability to modify deep calcium, no debris embolization causing slow flow or no-flow and minimal thermal injury. It is showing promising results in modification of difficult calcified lesion subsets such as calcified nodule, calcified left main bifurcation lesions and chronic total occlusion. In this review, authors will summarize the mechanism of action for IVL, its role in contemporary practice, evidence available for its use, its advantages over atherectomy devices and its imaging insight in different calcified lesion scenarios.

Published
2024
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24. Ion implantation in \b{eta}-Ga2O3: physics and technology

Author

Nikolskaya, Alena, Okulich, Evgenia, Korolev, Dmitry, Stepanov, Anton, Nikolichev, Dmitry, Mikhaylov, Alexey, Tetelbaum, David, Almaev, Aleksei, Bolzan, Charles Airton, Buaczik, Antônio Jr, Giulian, Raquel, Grande, Pedro Luis, Kumar, Ashok, Kumar, Mahesh, and Gogova, Daniela

Subjects
Condensed Matter - Materials Science
Abstract

Gallium oxide and in particular its thermodynamically stable \b{eta}-Ga2O3 phase is within the most exciting materials in research and technology nowadays due to its unique properties, such as an ultra-wide band gap and a very high breakdown electric field, finding a number of applications in electronics and optoelectronics. Ion implantation is a traditional technological method used in these fields, and its well-known advantages can contribute greatly to the rapid development of physics and technology of Ga2O3-based materials and devices. Here, the current status of ion beam implantation in \b{eta}-Ga2O3 is reviewed. The main attention is paid to the results of experimental study of damage under ion irradiation and the properties of Ga2O3 layers doped by ion implantation. The results of ab initio theoretical calculations of the impurities and defects parameters are briefly presented, and the physical principles of a number of analytical methods used to study implanted gallium oxide layers are highlighted. The use of ion implantation in the development of such Ga2O3-based devices as metal oxide field effect transistors, Schottky barrier diodes, and solar-blind UV detectors, is described together with systematical analysis of the achieved values of their characteristics. Finally, the most important challenges to be overcome in this field of science and technology are discussed.

Published
2021
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36. Chemoradiotherapy with concurrent durvalumab for the palliative treatment of oligometastatic oesophageal and gastrooesophageal carcinoma with dysphagia: a single arm phase II clinical trial (PALEO, sponsored by the Australasian Gastro-Intestinal Trials Group)

Author

Day, Fiona, Sridharan, Swetha, Lynam, James, Gedye, Craig, Johnson, Catherine, Fraser, Allison, Thompson, Stephen R., Michael, Michael, Leong, Trevor, Roy, Amitesh, Kumar, Mahesh, van der Westhuizen, Andre, Quah, Gaik T., Mandaliya, Hiren, Mallesara, Girish, Sappiatzer, Joshua, Oldmeadow, Christopher, and Martin, Jarad

Published
2022
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41. Accounting of carbon sequestration and tradeoff under various climatic scenarios in alternative agricultural system: a comprehensive framework toward carbon neutrality.

Author

Ansari, Meraj Alam, Ravisankar, Natesan, Shamim, Mohammad, Rani, Meenu, Prusty, Ashisa K., Singh, Raghuveer, K. J., Raghavendra, Joshi, Himanshu, Kumar, Sunil, Panwar, Azad Singh, and Kumar, Mahesh

Subjects
ALTERNATIVE agriculture, CARBON sequestration, CARBON offsetting, PRIME factors (Mathematics), GLOBAL warming
Abstract

Introduction: The increase in atmospheric CO2 concentration, which mainly is attributed to fossil-fuel combustion and deforestation, is often suggested as one of the prime causative factors toward accelerated global warming. This commends for sequestration of atmospheric carbon under terrestrial systems to partially offset fossil-fuel emissions. Concerning the same, agricultural sector presents an extensive opportunity, especially for countries such as India where over 55% of the population is engaged in the agriculture sector. Methods: Sequestering atmospheric carbon in agriculture requires the adoption of climate-resilient alternative agriculture practices without compromising food security. The deliberated study highlights the options of alteration in current conventional farming practices and its economic evaluation for sequestrating carbon under two Climate Change (CC) scenarios, viz., RCP 4.5 and 8.5, over three temporal scales, i.e., 2020, 2030, and 2050. Considering the current landuse pattern and existing growth rate in land-use shifting, three land-use policies, namely, Business as Usual (BaU), Optimistic, and Pessimistic scenario, integrated with CC scenarios were contemplated. Six possible futuristic scenarios were generated for the assessment of carbon sequestration and its valuation following the Integrated Valuation of Ecosystem Services and Tradeoff (InVEST) model. Results: The results suggested that across the studied region adopting an optimistic policy over BaU and pessimistic scenario, carbon can sequestrate an additional 0.64 to 1.46 Mt. (2.35 to 5.36 million ton CO2e) having an economic value of 193.4 to 504.8 million USD. Results: Moreover, the outcomes of the study are advocated for the policy of carbon credit in the agriculture sector, which shall contribute toward meeting various nationally determined contributions (NDCs) and sustainable development goals (SDGs) as well. [ABSTRACT FROM AUTHOR]

Published
2024
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