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Frontiers of physics 2016年第4期11卷 163-170页

作者： vishal thakur Niti Kant Department of Physics Lovely Professional University Phagwara-144411 Punjab India

The resonant third-harmonic generation of a tion was investigated. Because of self-focusing self-focusing laser in plasma with a density transi- of the fundamental laser pulse, a transverse intensity gradient was created, which generated a plasma wave at the fundamental wave frequency. Phase matching was satisfied by using a Wiggler magnetic field, which provided additional angular too- mentum to the third-harmonic photon to make the process resonant. An enhancement was observed in the resonant third-harmonic generation of an intense short-pulse laser in plasma embedded with a magnetic Wiggler with a density transition. A plasma density ramp played an important role in the self-focusing, enhancing the third-harmonic generation in plasma. We also examined the ef- fect of the Wiggler magnetic field on the pulse slippage of the third-harmonic pulse in plasma. The pulse slippage was due to the group-velocity mismatch between the fundamental and third-harmonic pulses.

关键词： short pulse laser pulse slippage third harmonic generation plasma

Relativistic Self-Focusing of Hermite-cosine-Gaussian Laser Beam in Collisionless Plasma with Exponential Density Transition

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Communications in Theoretical Physics 2019年第6期71卷 736-740页

作者： vishal thakur Manzoor Ahmad Wani Niti Kant Department of Physics Lovely Professional UniversityPhagwara-144411PunjabIndia Govt.Higher Secondary School Waterhail Budgam-191111J&KIndia

This work reveals an exploration of self-focusing of Hermite-cosine-Gaussian laser beam in a collisionless plasma under relativistic nonlinearity. Self-focusing along with self-trapping of Hermite-cosine-Gaussian laser beam are analyzed for different values of laser intensity, plasma density, and decentered parameters. Mathematical analysis displays that these parameters play a major role in achieving the stronger and earlier self-focusing. Further, a comparative study between self-focusing of Hermite-cosine-Gaussian laser beam with and without exponential density ramp profile is introduced. Plasma density transition with exponential profile is found to be more effective in order to have stronger self-focusing. The present analysis may lead to very useful applications in the field of efficient harmonic generation, laser driven fusion etc.

关键词： self-focusing collisionless plasma exponential plasma density ramp Hermite-cosine-Gaussian laser beam

Pulse Slippage of Resonant Third Harmonic Generation in Electron-Hole Plasma

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Communications in Theoretical Physics 2018年第9期69卷 311-316页

作者： vishal thakur Prabhdeep Kaur Amanpreet Kaur Niti Kant Department of Physics Lovely Professional UniversityG.T.RoadPhagwara-144411PunjabIndia Department of Applied Sciences Chandigarh Engineering College LandranMohali 140307PunjabIndia

Effect of pulse slippage on resonant third harmonic generation of a short pulse laser in electron-hole plasma in the presence of wiggler magnetic field has been *** group velocity mismatch of the third harmonic pulse and the fundamental pulse is significant in electron hole *** the third harmonic pulse has higher group velocity than that of fundamental pulse,therefore,it moves faster than the fundamental *** gets slipped out of the domain of fundamental pulse and its amplitude *** matching condition is satisfied by applying wiggler magnetic field,which provides additional angular momentum to the third harmonic photon to make the process *** in the efficiency of third harmonic generation of an intense short pulse laser in electron-hole plasma embedded with a magnetic wiggler is seen.

关键词： Wiggler magnetic field pulse slippage electron-hole plasma third harmonic generation laser

Relativistic Self-Focusing of Hermite-cosh-Gaussian Laser Beam in Magnetoplasma with Exponential Plasma Density Ramp

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Communications in Theoretical Physics 2019年第12期71卷 1469-1474页

作者： Niti Kant Shivani Vij Sudarshan Kumar Chakravarti Juleshwar Prasad Kushwaha vishal thakur Dcpartmcnt of Physics Lovely Professional UniversityG.T.Hoad.Phagwara 144411PunjabIndia Department of Applied Sciences DAV Institute of Engineering&TechnologyJalandhar-144008PunjabIndia Department of Physics T.M.B.UniversityUhagalpurIndia

In the present manuscript,we analyse the effect of exponential plasma density ramp for relativistic selffocusing of Hermite-cosh-Gaussian laser pulse in *** exponential plasma density ramp is found to be more prominent in achieving the stronger self-focusing of Hermite-cosh-Gaussian laser beam in comparison to the tangential plasma density *** propose a theoretical model for propagation of Hermite-cosh-Gaussian laser pulse in magnetoplasma with exponential density *** nonlinearity in the medium arises because of the relativistic motion of electrons,being responsible for relativistic *** of the beam width parameter is set up by taking the expression for the dielectric function and following Wentzel-Kramers-Brillouin(WKB)with paraxial ray approximations for mode indices m=0,1 and *** of decentered parameter is also analysed,which results in stronger self-focusing of the Hermite-cosh-Gaussian laser *** self-focusing of laser beam is more pronounced in high density plasma with higher magnetic field.

关键词： self-focusing decentered parameter exponential density ramp Hermite-cosh-Gaussian beam

Tailoring S-scheme-based carbon nanotubes(CNTs)mediated Ag-CuBi_(2)O_(4)/Bi_(2)S_(3)nanomaterials for photocatalytic dyes degradation in the aqueous system

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Journal of Materials Science & Technology 2023年第31期162卷 11-24页

作者： vishal Dutta Anita Sudhaik Sonu Pankaj Raizada Archana Singh Tansir Ahamad Sourbh thakur Quyet Van Le Van-Huy Nguyen Pardeep Singh School of Advanced Chemical Sciences Shoolini UniversitySolanHimachal Pradesh173212India Department of Chemistry University Centre for Research and DevelopmentChandigarh UniversityGharuanMohaliPunjabIndia Advanced Materials and Processes Research Institute Hoshangabad RoadBhopal462026MPIndia Department of Chemistry College of ScienceKing Saud UniversityRiyadhSaudi Arabia Department of Organic Chemistry Bioorganic Chemistry and BiotechnologySilesian University of TechnologyB.Krzywoustego 444-100 GliwicePoland Department of Materials Science and Engineering Institute of Green Manufacturing TechnologyKorea University145Anam-ro Seongbuk-guSeoul02841Republic of Korea Faculty of Allied Health Sciences Chettinad Hospital and Research InstituteChettinad Academy of Research and EducationKelambakkam603103Tamil NaduIndia

In this study,S-scheme-based hydrothermal synthesis of Ag-CuBi_(2)O_(4)/CNTs/Bi_(2)S_(3)layered composites has been successfully *** photo-degradation of toxic dyes,*** orange(MO),and methylene blue(MB),has been used to examine nanocomposites with varying weight percent of Bi_(2)S_(3)for photocat-alytic activity in the visible *** candidates,Ag-CuBi_(2)O_(4)/CNTs/Bi_(2)S_(3)with a 10%loading of Bi_(2)S_(3)outperformed both pure and hybrid composites in photocatalytic *** MO degradation,the hybrid composite with 10%Bi_(2)S_(3)loading degrades 7.04 times higher than pristine CuBi_(2)O_(4)and Bi_(2)S_(3)samples,and for MB degradation,it degrades 4.96 times higher than pristine *** surface area,less re-combination rate of photogenerated charge carriers,photogenerated carriers faster separation,and high redox ability of Ag-CuBi_(2)O_(4)/CNTs/Bi_(2)S_(3)(10%)are all attributed to the improving photocatalytic *** after ten cycles,the hybrid composite is chemically stable and *** nanotubes(CNTs)are a transfer bridge in layered structure for electrons because of their coordinated Fermi level between Ag-CuBi_(2)O_(4)and Bi_(2)S_(3).In addition,the scavenger and electron spin resonance(ESR)experiments verified that·O_(2)^(−),·OH,and h+were the important reactive species that successfully facilitated the pho-tocatalytic degradation process to degrade *** study presents a straightforward and economical approach for obtaining a stable semiconductor-based photocatalytic system and a potential technique for future applications.

关键词： Ag-CuBi_(2)O_(4) Bi_(2)S_(3) Carbon nanotubes(CNTs) S-scheme charge transfer Dye degradation

Value of neutrophil-lymphocyte ratio in evaluating response to percutaneous catheter drainage in patients with acute pancreatitis

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World Journal of Clinical Cases 2022年第1期10卷 91-103页

作者： Pankaj Gupta Gaurav Chayan Das Akash Bansal Jayanta Samanta Harshal S Mandavdhare vishal Sharma Shano Naseem Vikas Gupta thakur Deen Yadav Usha Dutta Neelam Varma Manavjit Singh Sandhu Rakesh Kochhar Department of Radiodiagnosis Postgraduate Institute of Medical Education and ResearchChandigarh 160012India Department of Gastroenterology Postgraduate Institute of Medical Education and ResearchChandigarh 160012India Department of Hematology Postgraduate Institute of Medical Education and ResearchChandigarh 160012India Department of Surgical Gastroenterology Postgraduate Institute of Medical Education and ResearchChandigarh 160012India

BACKGROUND Early prediction of response to percutaneous catheter drainage(PCD)of necrotic collections in acute pancreatitis(AP)using simple and objective tests is critical as it may determine patient *** role of white blood cell(WBC)count and neutrophil-lymphocyte ratio(NLR)has not been assessed as a tool of early prediction of PCD success and is the focus of this *** To assess the value of WBC and NLR in predicting response to PCD in *** This retrospective study comprised consecutive patients with AP who underwent PCD between June 2018 and December *** and fluid collections were classified according to the revised Atlanta classification and organ failure was defined according to the modified Marshall *** and NLR were monitored 24 h prior PCD(WBC-0/NLR-0)and 24 h(WBC-1/NLR-1),48 h(WBC-2/NLR-2)and 72 h(WBC-3/NLR-3)after *** was calculated by dividing the number of neutrophils by the number of *** association of success of PCD(defined as survival without the need for surgery)with WBC and NLR was *** trend of WBC and NLR was also assessed post *** One hundred fifty-five patients[median age 40±13.6(SD),64.5%males,53.5%severe AP]were included in the final *** was done for acute necrotic collection in 99(63.8%)patients and walled-off necrosis in 56(36.1%)*** pain to PCD interval was 24±69.89 *** was successful in 109 patients(group 1)and 46 patients(group 2)who failed to *** was no significant difference in the baseline characteristics between the two groups except the severity of AP and frequency of organ *** WBC and NLR showed an overall decreasing *** was a significant difference between WBC-0 and WBC-1(P=0.0001).WBC-1 and NLR-1 were significantly different between the two groups(P=0.048 and 0.003,respectively).The area under the curve of WBC-1 and NLR-1 for predicting the success of PCD was 0.602 and 0.682,*** a cut-off value of 9.87 fo

关键词： Acute pancreatitis Percutaneous catheter drainage White blood cell Neutrophil-lymphocyte ratio Necrotic collection