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Space-Charge Field Assisted Electron Acceleration by Plasma Wave in Magnetic Plasma Channel
Gupta, Devki Nandan,Kaur, Maninder,Gopal, Krishna,Suk, Hyyong IEEE 2016 IEEE transactions on plasma science Vol.44 No.11
<P>When the duration of a laser pulse is comparable to the plasma wave period, a large-amplitude plasma wave can be driven by the laser. In the presence of a guiding magnetic field, the large-amplitude plasma wave of finite transverse extent and large phase velocity resonantly accelerates the electrons to a higher energy level. For a small laser spot size, the laser exerts an axial as well as the radial ponderomotive force on the electrons that creates a density depression on the laser axis. This electron-depleted channel also creates a radial electric field ( ion space-charge field). The acceleration of electrons in this channel is investigated, where the effect of ion space-charge field is considered, by solving the single particle dynamical equations. This paper shows that the space charge field plays an important role in electron energy gain during acceleration by a plasma wave in a magnetic plasma channel. This paper may be crucial in understanding the dynamics of particle motion and improving the quality of accelerated electron beam in the laser wakefield accelerators.</P>
Harminder Singh,Anu Sheetal,Jaspreet Kaur,Maninder Singh,Manupriya Sharma 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.5
The main idea behind this study is to fabricate a cost-effective and eco-friendly source of electrical energy for battery-less IOT devices, sensors and small medical/electronic wearable devices, as per the UN’s sustainable development goal SDG 7 (affordable and clean energy). In this study, an electrical energy generation device triboelectric nanogenerator (TENG) is designed and fabricated from fish fin, which is biocompatible, non-toxic, and treated as waste material in the fish market. The fish fin isolated from the waste of the fish is converted to the dielectric layer of the TENG, which is further utilized to convert ambient mechanical energy into useful electrical energy. The thermal stability of the material also has been tested using TGA, and it was observed that it was stable to work up to 100°C. Other biomaterial combinations of egg shell membrane, dog hairs, and tree cotton are also tested in this study. The output of the fish fin based fabricated TENG is utilized to power up 65 green LEDs connected in the series, which is equivalent to 130 V of voltage, and the current of 1.1µA was measured across a 1MΩ resistor. This output of the TENG was used to power up a small digital watch. The fabricated device can also be used as sensor to detect human motion.
Fibrolamellar variant of hepatocellular carcinoma presenting during pregnancy
Nagalapuram Vishnu,Aditya V Kulkarni,Sreenivasan Vidhyalakshmi,Swaminathan Sambandam,Prerna Garg,Venkatakrishnan LeelaKrishnan,Krishnaveni Janarthan,Gursharan Singh,Maninder Kaur,TV Chitra,Biku Joseph 한국간담췌외과학회 2017 Annals of hepato-biliary-pancreatic surgery Vol.21 No.1
The Fibrolamellar variant of Hepatocellular Carcinoma (FLHCC) is a rare form of liver cancer that presents in the 3<SUP>rd</SUP> decade of life, is rarely associated with cirrhosis or chronic Hepatitis B/C virus infection, and usually presents with normal serum alpha-fetoprotein (AFP) levels. FLHCC presenting during pregnancy is extremely rare, with only 4 cases reported. We present a case of FLHCC in pregnancy and discuss the dilemmas in management. A 26 year-old primigravida, 26 weeks of gestation presented with a month’s history of obstructive jaundice secondary. Investigations revealed a mass in the left lateral segment of the liver with extension down the left hepatic duct into the common bile duct. Following an emergency caesarean section at 31 weeks, she underwent a left hepatectomy with extrahepatic bile duct excision. The postoperative course was uneventful. Histopathology showed FLHCC. In conclusion, liver tumors presenting during pregnancy should be managed in a multidisciplinary setup with facilities for neonatal intensive care. Management depends on the presumed pathology, period of gestation and family preferences.