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Sandeep Kumar Bhoriwal,Sunil Kumar,SVS Deo,Jyoti Sharma,Ashutosh Mishra,Naveen Kumar,Jyoutishman Saikia,Kunal Dhall 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.2
Backgrounds/Aims: Morbidity following Whipple’s surgery largely depends upon the pancreatic stump anastomosis leak. Pancreaticogastrostomy is one of the techniques of pancreatic stump reconstruction and is described variously in the literature. Duct to mucosa pancreaticogastrostomy is described either by a large 3-4 cm posterior gastrotomy or by small gastrotomy of 2-3 mm with the use of internal stents along with. We describe clinical outcomes and technique of 2 layer end to side pancreatico-gastrostomy by a small posterior gastrotomy without the use of internal stents. Methods: Hospital records of 35 patients where the technique of, small posterior gastrotomy end to side duct to mucosa pancreatico-gastrostomy without internal stents, was used for pancreatic stump reconstruction were studied retrospectively. The data were analyzed for demographic details, stage of the disease, and short term outcomes related to surgical procedure. Results: The mean duration of surgery was 7.4 hours. Grade A, B, and C POPF were observed in 10 (28.5%), 3 (8.5%), and 1 (2.8%) of patients respectively. The mean time to remove pancreatic drain was 9 days, and the mean time to start oral feeds was 8.9 days. The mean hospital stay was 12.9 days (07-26). Thirty days mortality was 2.8%. Conclusions: Unstented duct to mucosa end to side pancreatico-gastrostomy technique is comparable with other pancreatico-gastrostomy techniques in outcomes in terms of POPF, morbidity, mortality, and hospital stay. However, to establish the superiority or inferiority of this technique, a larger study is recommended.
Verma Sandeep Kumar,Das Ashok Kumar,Gantait Saikat,Panwar Yogita,Kumar Vinay,Brestic Marian 한국탄소학회 2022 Carbon Letters Vol.32 No.2
Nanomaterials (NMs) are gradually becoming pervasive in the modern world, entering every application for improving the quality of life. Multifaceted uses of NMs in curing diseases, biomedical instrumentation, bioimaging, drugs, and gene delivery, display devices, nanosensors, and biomarkers in several fields ranging from agriculture to industries, healthcare, and environment, have been well recognized. Carbon-based nanomaterials (CNMs) constitute a major type of NMs with broad-spectrum applications including their uses in agriculture. These are synthesized in large quantities via synthetic and biological approaches. Biological approaches are gaining appreciation and momentum, owing to the advantages associated with them, major being their environment friendly or ‘Green’ nature. This topical review focuses on the preparation of CNMs using natural resources, i.e., using the Green Nanotechnology. The up-to-date compilation presented here includes most of the popular green technological methods of producing the CNMs and their immediate uses as anticancer agents, in bio-labelling, as biosensors, in bio-remediation, in cell imaging, in fluorescent inks, and fluorescent dyes, as plant growth inducing agents, in nano-probes, in light-emitting devices and other applications. It is intended to update the reader with the state-of-the-art knowledge about the green technological methods for synthesizing CNMs, their uses, current trends, challenges, and future outlook on the topic.
Probabilistic free vibration analysis of Goland wing
Kumar, Sandeep,Onkar, Amit Kumar,Manjuprasad, M. The Society for Aerospace System Engineering 2019 International Journal of Aerospace System Engineer Vol.6 No.2
In this paper, the probabilistic free vibration analysis of a geometrically coupled cantilever wing with uncertain material properties is carried out using stochastic finite element (SFEM) based on first order perturbation technique. Here, both stiffness and damping of the system are considered as random parameters. The bending and torsional rigidities are assumed as spatially varying second order Gaussian random fields and represented by Karhunen Loeve (K-L) expansion. Here, the expected value, standard deviation, and probability distribution of random natural frequencies and damping ratios are computed. The results obtained from the present approach are also compared with Monte Carlo simulations (MCS). The results show that the uncertain bending rigidity has more influence on the damping ratio and frequency of modes 1 and 3 while uncertain torsional rigidity has more influence on the damping ratio and frequency of modes 2 and 3.
Sandeep Kumar,M. Yoon 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Irrespective of the chirped pulse inverse free electron laser (CPIFEL) concept, a comparative study of a chirped circular-polarized (CP) laser pulse and a chirped linear-polarized (LP) laser pulse has been done numerically via electron acceleration in vacuum. We found that ultrahigh acceleration of the electron could be achieved by each chirped laser CP and LP pulse. Due to some unique property of the CP laser pulse, like a large acceleration phase channel and axial symmetry of the electromagnetic fields (EM), the acceleration gradient is expected to be higher in a chirped CP laser pulse than in a chirped LP laser pulse. A combination of periodically tapered wiggler magnetic field helps in stabilizing the transverse motion of the electron and projects one component of the laser’s electric field in the direction of the electron motion, resulting in a higher energy gain. Laser parameters, like the amplitude, the initial phase of the laser and the laser frequency chirped parameter in addition to the tapered wiggler magnetic field parameters, all have strong influence on the electron energy gain. It is higher for the combination of a chirped CP laser with a circular wiggler magnetic field than for a chirped LP laser and a planar wiggler magnetic field. We show that energy gradients of several giga-electron-volts (GeV) per meter may be obtained when the parameters are adjusted in such a way to meet the IFEL resonance condition.
Kumar, Sandeep,Kang, Heung-Sik,Kim, Dong Eon Optical Society of America 2011 Optics express Vol.19 No.8
<P>The generation of isolated attosecond hard x-ray pulse has been studied under the enhanced self-amplified spontaneous emission (ESASE) scheme with the density and energy modulation of an electron bunch. It is demonstrated in simulation that an isolated attosecond hard x-ray pulse of a high contrast ratio can be produced by adjusting a driver laser wavelength and the energy distribution of an electron bunch. An isolated attosecond pulse of ~146 attosecond full-width half-maximum (FWHM) at 0.1 nm wavelength is obtained with a saturation length of 34 meter for the electron beam parameters of Korean X-ray Free Electron laser.</P>
Detection and Performance Analysis of Wormhole Attack in MANET using DELPHI Technique
Sandeep Kumar Arora,Ayushree 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.10
Security is one of the primary issue in the Mobile Adhoc Network (MANET) particularly as for the size and complex nature of the system. The principle reason of security issues in MANET is that there is no physical connection between the nodes. This paper gives the impact of wormhole attack and discloses how to provide security to the packets with the help of Delphi technique. By applying Delay Per Hop Indicator (DELPHI), nodes which are the responsible for wormhole attack can be removed with the support of hop count method and AODV routing The metrics used for calculating network presentation are packet loss, throughput and end to end delay, which gives the better Quality of Services.
Bio-hydrometallurgical processing of low grade chalcopyrite for the recovery of copper metal
Sandeep Panda,Lala Behari Sukla,Chinmaya Kumar Sarangi,Nilotpala Pradhan,Tondepu Subbaiah,Barada Kanta Mishra,Gur Lal Bhatoa,Mullukutlashivram Prasad,Subrat Kumar Ray 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
A process flowsheet was developed to recover copper metal from the lean sulfide ore of copper available at Malanjkhand, Hindustan Copper Limited (HCL), India. Copper pregnant leach solution (PLS) obtained from bio-heap leaching of chalcopyrite containing 0.3% copper was purified through solvent extraction (SX) and the copper recovered by electrowinning (EW). The copper-free raffinate obtained from SX stripping unit was returned back to the bioleaching circuit. The purity of the electrolytic copper produced at pilot scale was found to be 99.96%. During electrowinning,the effect of flow rate of electrolyte on current efficiency and energy consumption was also studied.
Sandeep Kumar,윤무현 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
For a tightly focused laser, the beam-waist radius is of the same order as the wavelength and the lower-order-corrected Gaussian pulse description satisfies Maxwell's equations less accurately, so it becomes necessary to include all the field components that arise from the tight focusing of the laser so as to satisfy Maxwell's equations more accurately. The effect of the seventh-order-corrected chirped Gaussian laser beam on the electron acceleration in vacuum is investigated. A numerical simulation shows that an electron maximum energy gain on the order of giga-electron volts (GeV) can be expected in the beam-waist region 45≤k0w0≤60, where k0 is the laser wave number and w0 is the laser-beam's waist size at the focal point of the beam.