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Fe–P: A New Class of Electroactive Catalyst for Oxygen Reduction Reaction
Singh, Kiran Pal,Bae, Eun Jin,Yu, Jong-Sung American Chemical Society 2015 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.137 No.9
<P>It has been long thought that Fe-N-C structure, where Fe is bonded with an electronegative heteroatom N, plays a key role as nonprecious Metal Catalyst for oxygen reduction reaction (ORR) in fuel tells. However, eledtrocatalytic activity of Fe bonded with electropositive heteroatom P has never been considered for ORR. Herein We report the electrocatalytic activity for ORR of new Fe-P-C.</P>
Narendra Pal Singh Chauhan,Masoud Mozafari,Narendra Singh Chundawat,Kiran Meghwal,Rakshit Ameta,Suresh C. Ameta 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
A simple electrochemical reduction procedure can be applied to nanostructured composite films ofpolyaniline (PANI) and graphene oxide (GO), which results conversion of GO into reduced GO (rGO) withimproved electroactivity of the PANI composite films. These also suffer from certain drawbacks likecyclic stability and lesser electrochemical properties. Three-dimensional hollow balls of graphene/polyaniline (3D-HBGP) hybrid and poly(methyl methacrylate) (PMMA)/polyaniline, sulfonatedgraphene/polyaniline (SG/PANI) and colloidal graphene oxide/polyaniline (PANI CGO) with high energydensity 24.3 W h kg 1 and power density 28.1 kW kg 1 are good candidates for this purpose. This reviewsummarizes developmental stage of different nanocomposites based on graphene and polyaniline.
Singh, Gajendra Pal,Sahay, Alok,Kulshresth, Varun,Kumar, Phani Kiran,Pallavi, Saumya,Ojha, Nand Gopal,Prasad, Bhagwan Chandra Korean Society of Sericultural Science 2010 International Journal of Industrial Entomology Vol.20 No.1
Ten numbers of plants, based on their medicinal value, were used to test their efficacy against virosis (caused by cytoplassmic polyhedrosis virus) in tasar silkworm, Antheraea mylitta Drury. in indoor rearing conditions. The aqueous extracts of leaf of Azadirichita indica (neem), Acharanthus aspera, Psoralea corylifolia, Asparagus racemosus, Adhatoda zelanica (Basak), Andrographis paniculata (Kalmegh), Moringa oilephera (sahjan), whole plant of Phyllanthus urinaria (Bhuiamla), Centella asiatica (Veng sag) and Curcuma longa (Haldi powder) in different concentrations were used for containment of virosis in silkworm larvae. The tasar silkworm larvae were orally inoculated with PIBs ($1\times10^6$) of AmCPV in $2^{nd}$ instar and treated with plant extracts in each instar ($2^{rd}$ instar onwards). The mortality due to virosis was recorded during larval period. The plant extracts, irrespective of their concentrations, were found effective in suppressing the virosis where P. urinaria reduced the virosis to 56.90% followed by A. paniculata (53.82%) and least in C. asiatica (5.15%). The lowest pooled larva mortality 36.99% was recorded in the treatment of P. urinaria. Comparatively higher larva mortality 39.91% was observed with the treatment of A. paniculata. The highest larva mortality in treatment was with C. asiatica (81.99%). In treated control larva mortality was 86.50%.
ON A SEMI-SYMMETRIC METRIC CONNECTION IN AN (ε)-KENMOTSU MANIFOLD
Singh, Ram Nawal,Pandey, Shravan Kumar,Pandey, Giteshwari,Tiwari, Kiran Korean Mathematical Society 2014 대한수학회논문집 Vol.29 No.2
The object of the present paper is to study a semi-symmetric metric connection in an (${\varepsilon}$)-Kenmotsu manifold. In this paper, we study a semi-symmetric metric connection in an (${\varepsilon}$)-Kenmotsu manifold whose projective curvature tensor satisfies certain curvature conditions.
( Surjeet Singh Chauhan ),( Kiran Utreja ),( Mohammad Imdad ),( Md Ahmadullah ) 호남수학회 2017 호남수학학술지 Vol.39 No.1
In this paper, we introduce a new scheme namely: CUIA- iterative scheme and utilize the same to prove a strong convergence theorem for quasi contractive mappings in Banach spaces. We also establish the equivalence of our new iterative scheme with various iterative schemes namely: Picard, Mann, Ishikawa, Agarwal et al., Noor, SP, CR etc for quasi contractive mappings besides carrying out a comparative study of rate of convergences of involve iterative schemes. The present new iterative scheme converges faster than above mentioned iterative schemes whose detailed comparison carried out with the help of different tables and graphs prepared with the help of MATLAB.
GPU-warp based finite element matrices generation and assembly using coloring method
Utpal Kiran,Deepak Sharma,Sachin Singh Gautam 한국CDE학회 2019 Journal of computational design and engineering Vol.6 No.4
Finite element method has been successfully implemented on the graphics processing units to achieve a significant reduction in simulation time. In this paper, new strategies for the finite element matrix gen-eration including numerical integration and assembly are proposed by using a warp per element for a given mesh. These strategies are developed using the well-known coloring method. The proposed strate-gies use a specialized algorithm to realize fine-grain parallelism and efficient use of on-chip memory resources. The warp shuffle feature of Compute Unified Device Architecture (CUDA) is used to accelerate numerical integration. The evaluation of elemental stiffness matrix is further optimized by adopting a partial parallel implementation of numerical integration. Performance evaluations of the proposed strate-gies are done for three-dimensional elasticity problem using the 8-noded hexahedral elements with three degrees of freedom per node. We obtain a speedup of up to 8.2 over the coloring based assembly by element strategy (using a single thread per element) on NVIDIA Tesla K40 GPU. Also, the proposed strate-gies achieve better arithmetic throughput and bandwidth
A review of temporomandibular joint-related papers published between 2014-2015
Vaibhav Singh,K.N.V. Sudhakar,Kiran Kumar Mallela,Rajat Mohanty 대한구강악안면외과학회 2017 대한구강악안면외과학회지 Vol.43 No.6
We conducted a retrospective study and reviewed the temporomandibular joint (TMJ)-related papers published in a leading international journal, Journal of Oral and Maxillofacial Surgery , between January 2014 and December 2015. The study was conducted to ascertain and compare the trends of articles being published in the years 2014 and 2015. A total of 28 articles were reviewed, of which most of the full-length articles were on clinical management and outcomes and the role of radiology. The bulk of the studies were prospective, and less interest was shown in experimental research. A thorough review and analysis thus gives the impression that there is a great need for well-designed clinical studies on TMJ.
Impact of lymph node staging systems in predicting outcome in patients with ampullary cancer
Sundeep Singh Saluja,Pramod Kumar Mishra,Shashi Kiran,Harsh J. Shah,Sandip Chandrasekar,Mohammed Nayeem,Aditya Sharma,Vaibhav Kumar Varshney 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.4
Backgrounds/Aims: Lymph node (LN) metastasis though, is a poor prognostic factor for ampullary carcinoma (APC), the impact of Lymph node ratio (LNR) and Logarithm odds of positive lymph node (LODDS) in the long-term survival remains controversial. We evaluated the factors affecting the long-term outcome in APC patients with emphasis on LNR and LODDS. Methods: The prospectively collected data of 198 patients who underwent pancreatoduodenectomy for APC was analyzed after excluding 12 patients for various reasons. Factors affecting Disease specific survival (DSS) and Recurrence free survival (RFS) were analyzed with special reference to LN positivity, LNR and LODDS. Results: Out of 186, 117 (62.9%) patients were alive at a median follow-up of 39.5 months and 72 (38.7%) developed recurrence. The overall 5-year DSS was 59.3% & RFS 54.9%. Univariate analysis showed T-stage, tumor differentiation, perineural invasion, LN positivity, LNR and LODDS was significantly affected DSS and RFS. On multivariate analysis, perineural invasion, LN positivity, LNR and LODDS lost its significance for DSS and RFS. AUC for prediction of DSS and RFS for LNR was 0.654 (p<0.001) & 0.629 (p=0.003) respectively and for LODDS, it was 0.697 (p<0.001) & 0.677 (p=0.001) respectively. Sensitivity and specificity of LNR (0.1) for DSS were 37.7% & 83.8% and for RFS were 36.1% & 83.3%; for LODDS (−1.00), sensitivity and specificity for DSS was 62.3% and 67.5% and for RFS it was 59.7% and 66.7% respectively. Conclusions: LNR and LODDS although independently seem to affect the RFS and DSS, albeit have a low sensitivity and specificity in predicting DSS and RFS.
A new class of electroactive Fe- and P-functionalized graphene for oxygen reduction
Razmjooei, Fatemeh,Singh, Kiran Pal,Bae, Eun Jin,Yu, Jong-Sung The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.20
<▼1><P>A new class of electroactive Fe- and P-functionalized reduced graphene oxide is prepared, which illustrates high ORR activity both in alkaline and acidic conditions due to its high surface area and formation of active Fe–P complex.</P></▼1><▼2><P>While metal and electronegative N-containing carbon has aroused great interest as an efficient catalyst towards the oxygen reduction reaction (ORR), no combination of metal with other heteroatom-containing carbon has received considerable attention. This has motivated us to explore the performance of carbon functionalized with metal and electropositive phosphorous. Herein, we present the first report on the synthesis of a new class of electroactive Fe- and P-functionalized graphene (GPFe) and its electrocatalytic properties in alkaline and acidic media. The introduction of Fe causes remarkable synergistic effects on P-doped reduced graphene oxide by increasing surface area, enhancing the P doping level due to the interaction between Fe and P and generating electrochemically active Fe–P species. N-oxides are known to be in-active for ORR in Fe–N systems, whereas in present Fe–P systems, oxides of Fe and P are found to be beneficial for ORR. Interestingly, after the introduction of Fe, mostly inactive P-doped carbon becomes active in acidic medium. We propose that this study will surely provide renewed insights into active sites for ORR in metal and heteroatom-doped carbon systems.</P></▼2>