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Neha Sharma,Sunanda Sharda,Dheeraj Sharma,Vineet Sharma,P. B. Barman,S.C. Katyal,Pankaj Sharma,S. K. Hazra 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
Steady state current-voltage characteristics of the amorphous (Se80Te20)98Y2 (Y = Ag, Bi, Ge, Cd) semiconductors at different temperatures are reported. The measurements were performed using direct-current voltage bias to understand the basic conductivity mechanism and to evaluate the impact of each substituent on electrical response. The space charge limited conduction mechanism, and the density of states near Fermi level have been calculated. The difference in electrical response due to different substitutions in the glassy matrix is analyzed.
Adsorptive separation of carbon dioxide by polyethyleneimine modified adsorbents
Pankaj Sharma,백일현,Ye-Won Park,Sung-Chan Nam,박정훈,Sang-Do Park,Sung Youl Park 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.2
Utilization of carbon dioxide (CO2) has become an important global issue due to significant and continuous rise in atmospheric CO2 concentrations. To find a potential solution, two types of mesoporous materials, MCM-41 and MCM-48, were synthesized and impregnated with 30, 50 and 70 wt% of polyethyleneimine (PEI) in methanol to evaluate the performance of the materials in terms of CO2 adsorption. The materials were characterized by XRD, TGA, FTIR,TEM, SEM, N2-physisorption and BET techniques. All the PEI-loaded materials exhibited substantially higher reversible CO2 adsorption-desorption behaviors with >99% recovery. The above study proved that MCM-48 is a better material as compared to MCM-41 for loading of PEI. The material with 50 wt% loading of PEI on MCM-48, showed maximum adsorption of 248 mg/g-PEI at 80 oC which is about 30 times higher than that of MCM-48 and about 2.3times that of pure PEI.
Pankaj Sharma,Alok Ranjan,Rahul Lath 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.3
Filum terminale arteriovenous fistula (FTAVF) presenting as a cause of failed back surgery syndrome is a rare entity. We report a 48-year-old male patient who presented with clinical features of a conus medullaris/cauda equina lesion. He had upper and lower motor neuron signs in both the lower limbs with autonomic dysfunction. The patient was misdiagnosed and was operated twice earlier for lumbar canal stenosis and disc prolapse. After reviewing his clinical and radiological findings a diagnosis of FTAVF was made. He underwent surgery and there was a significant improvement in his neurological functions. We discuss the case and review the literature on FTAVF’s.
Equimolar Carbon Dioxide Absorption by Ether Functionalized Imidazolium Ionic Liquids
Pankaj Sharma,Sang Do Park,Ki Tae Park,정순관,Sung Chan Nam,Il Hyun Baek 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
A series [C3Omim][X] of imidazolium cation-based ILs, with ether functional group on the alkyl side-chain have been synthesized and structure of the materials were confirmed by various techniques like 1H, 13C NMR spectroscopy, MS-ESI, FTIR spectroscopy and EA. More specifically, the influence of changing the anion with same cation is carried out. The absorption capacity of CO2 for ILs were evaluated at 30 and 50 ºC at ambient pressure (0-1.6 bar). Ether functionalized ILs shows significantly high absorption capacity for CO2. In general, the CO2 absorption capacity of ILs increased with a rise in pressure and decreased when temperature was raised. The obtained results showed that absorption capacity reached about 0.9 mol CO2 per mol of IL at 30 ºC. The most probable mechanism of interaction of CO2 with ILs were investigated using FTIR spectroscopy, 13C NMR spectroscopy and result shows that the absorption of CO2 in ether functionalized ILs is a chemical process. The CO2 absorption results and detailed study indicates the predominance of 1:1 mechanism, where the CO2 reacts with one IL to form a carbamic acid. The CO2 absorption capacity of ILs for different anions follows the trend: BF4 < DCA < PF6 < TfO < Tf2N. Moreover, the as-synthesized ILs is selective, thermally stable, long life operational and can be recycled at a temperature of 70 ºC or under vacuum and can be used repeatedly.
Pankaj Kr. Sharma,Shashi Prakash Dwivedi,Ajay Kumar,Amit Kumar Sharma 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
In the present investigation an effort has been made to produce Al-Fly ash green composite using liquid state stir casting technique followed by green ultrasonic vibration such that it can improve wettability of fly-ash with aluminium by adding magnesium in the presence of argon gas. Addition of magnesium increases wettability of fly-ash particle in the molten aluminium and improves mechanical properties of Al-Fly ash green composite to a great extent. Incorporation of magnesium enhances the homogeneous allocation of fly ash particles in the pure aluminium alloy. More uniform distribution of Fly ash provides better mechanical properties. In this study, sample of Al/2 wt.% Mg/8 wt.% Fly ash provides most excellent outcome amongst all the selected composition. Microstructures show that the distribution of reinforcements is more uniform in this composition. TEM image shows proper wettability between aluminium and reinforcements. Density, cost estimation, hardness, toughness, ductility and tensile strength were also calculated to observe the result of magnesium and fly ash addition in aluminium matrix.
Equimolar Carbon Dioxide Absorption by Ether Functionalized Imidazolium Ionic Liquids
Sharma, Pankaj,Park, Sang-Do,Park, Ki-Tae,Jeong, Soon-Kwan,Nam, Sung-Chan,Baek, Il-Hyun Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
A series $[C_3Omim]$[X] of imidazolium cation-based ILs, with ether functional group on the alkyl side-chain have been synthesized and structure of the materials were confirmed by various techniques like $^1H$, $^{13}C$ NMR spectroscopy, MS-ESI, FTIR spectroscopy and EA. More specifically, the influence of changing the anion with same cation is carried out. The absorption capacity of $CO_2$ for ILs were evaluated at 30 and $50^{\circ}C$ at ambient pressure (0-1.6 bar). Ether functionalized ILs shows significantly high absorption capacity for $CO_2$. In general, the $CO_2$ absorption capacity of ILs increased with a rise in pressure and decreased when temperature was raised. The obtained results showed that absorption capacity reached about 0.9 mol $CO_2$ per mol of IL at $30^{\circ}C$. The most probable mechanism of interaction of $CO_2$ with ILs were investigated using FTIR spectroscopy, $^{13}C$ NMR spectroscopy and result shows that the absorption of $CO_2$ in ether functionalized ILs is a chemical process. The $CO_2$ absorption results and detailed study indicates the predominance of 1:1 mechanism, where the $CO_2$ reacts with one IL to form a carbamic acid. The $CO_2$ absorption capacity of ILs for different anions follows the trend: $BF_4$ < DCA < $PF_6$ < TfO < $Tf_2N$. Moreover, the as-synthesized ILs is selective, thermally stable, long life operational and can be recycled at a temperature of $70^{\circ}C$ or under vacuum and can be used repeatedly.
Coverage Probability of 3-D Mobile UAV Networks
Sharma, Pankaj K.,Kim, Dong In IEEE 2019 IEEE wireless communications letters Vol.8 No.1
<P>In this letter, we consider a network of multiple unmanned aerial vehicles (UAVs) where a given number of UAVs are placed at 3-D locations in a finite circular disk shaped region to serve a reference ground user equipment (UE) located at its center. Herein, a serving UAV is assumed to be located at fixed altitude which communicates with the reference UE. All the other UAVs in the network are designated as interfering UAVs to the UE and are assumed to have 3-D mobility. To characterize the 3-D UAV movement process, we hereby propose an effective 3-D mobility model based on the mixed random waypoint mobility and uniform mobility models in the vertical and spatial directions. Further, considering the proposed 3-D mobility model, we first characterize the interference received at reference UE, and then evaluate its coverage probability under Nakagami- <TEX>${m}$</TEX> fading. We quantify the achievable performance gains for the ground UE under various system and channel conditions. Moreover, we corroborate our analytical results through simulations.</P>
Kirti Sharma,Vishal Dutta,Sheetal Sharma,Pankaj Raizada,Ahmad Hosseini-Bandegharaei,Pankaj Thakur,Pardeep Singh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Recently, layered bismuth oxyhalides (BiOX, X = F, Cl, Br and I) have received significant attention aspotential photocatalysts for energy and environment applications. However, limited visible light activityand recombination of photogenerated charge carriers limit their applications for photocatalytic waterpurification. In this review, various strategies such as heterojunction formation, metal/non-metal doping,interface modification, enhancement in Bi content, inner coupling between different BiOX photocatalyst,use of sensitizers and creation of oxygen vacancies was deliberated for improved photocatalyticperformance of BiOX. The integration of BiOX with other photocatalysts, mechanism for enhancedactivity and conclusive outlook with future challenges was also elaborated.