Coulomb and quenching effects in small nanoparticle-based spasers

We study numerically the effect of mode mixing and direct dipole-dipole interactions between gain molecules on spasing in a small composite nanoparticles with a metallic core and a dye-doped dielectric shell. By combining Maxwell-Bloch equations with Green's function formalism, we calculate lasing frequency and threshold population inversion for various gain densities in the shell. We find that gain coupling to nonresonant plasmon modes has a negligible effect on spasing threshold. In contrast, the direct dipole-dipole coupling, by causing random shifts of gain molecules' excitation frequencies, hinders reaching the spasing threshold in small systems. We identify a region of parameter space in which spasing can occur considering these effects.Comment: 7 pages, 6 figure

An application of Martingale convergence theorem to analyse company data

Martingale Convergence Theorem, in a slightly general form, when applied to the process of investor's fortune tells that an investor with a limited aim of enhancing her fortune k-fold will, in due course, either attain her aim or lose the entire initial investment. We verify and apply this theorem to analyse certain company data

Development of titanium dioxide nanowire incorporated poly(vinylidene fluoride–trifluoroethylene) scaffolds for bone tissue engineering applications

Critical size bone defects that do not heal spontaneously are among the major reasons for the disability in majority of people with locomotor disabilities. Tissue engineering has become a promising approach for repairing such large tissue injuries including critical size bone defects. Three-dimension (3D) porous scaffolds based on piezoelectric polymers like poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) have received a lot of attention in bone tissue engineering due to their favorable osteogenic properties. Owing to the favourable redox properties, titanium dioxide (TiO2) nanostructures have gained a great deal of attention in bone tissue engineering. In this paper, tissue engineering scaffolds based on P(VDF-TrFE) loaded with TiO2 nanowires (TNW) were developed and evaluated for bone tissue engineering. Wet-chemical method was used for the synthesis of TNW. Obtained TNW were thoroughly characterized for the physicochemical and morphological properties using techniques such as X-Ray diffraction (XRD) analysis and transmission electron microscopy (TEM). Electrospinning was used to produce TNW incorporated P(VDF-TrFE) scaffolds. Developed scaffolds were characterized by state of art techniques such as Scanning Electron Microscopy (SEM), XRD and Differential scanning calorimetry (DSC) analyses. TEM analysis revealed that the obtained TiO2 nanostructures possess nanofibrous morphology with an average diameter of 26 ± 4 nm. Results of characterization of nanocomposite scaffolds confirmed the effective loading of TNW in P(VDF-TrFE) matrix. Fabricated P(VDF-TrFE)/TNW scaffolds possessed good mechanical strength and cytocompatibility. Osteoblast like cells showed higher adhesion and proliferation on the nanocomposite scaffolds. This investigation revealed that the developed P(VDF-TrFE) scaffolds containing TNW can be used as potential scaffolds for bone tissue engineering applications.This work was supported by the French PIA project « Lorraine university d’excellence » reference ANR-15-IDEX-04-LUE. This article was also made possible by the NPRP9-144-3-021 grant funded by Qatar National Research Fund (a part of Qatar Foundation). The statements made here are the sole responsibility of the authors. Open Access funding was provided by the Qatar National Library

Implications and Types of Artefacts in Oral Histopathology Tissue Processing

There is a scarcity of information regarding the occurrence and appearance of artefacts in the literature studies observed till date. This study aims to provide a more a comprehensive approach on identifying the different types of artefacts and also attempts to provide with description regarding their relation to the parent slide and the remedies in order to prevent misinterpretation. This study aimed to prepare a comprehensive report of the commonly occurring artefacts in archival collection of pathology laboratory

Marine fish landings in Kerala during 2016 - An overview

Kerala has 188 marine fish landing centres along the coastline of 590 km length and 1.2 lakh marine fishermen families. The estimated marine fish landings in Kerala during 2016 was 5,22,550 tonnes (t) contributing about 14% of the marine fish production in the countr

Enhancing Organizational Performance Through Effective Leadership in Public Enterprises: A Study of the Adamawa Investment and Property Development Company Ltd

The study examined the impact of effective leadership on the performance of public enterprises with a particular reference to the Adamawa Investment and Property Development Company Ltd. The study made use of content analysis and observation method. The study revealed that the performance of organization depends to a large extent on the efficiency or effectiveness of the leadership. It was also revealed that the Adamawa State Investment and Property Development Company Limited has not lived up to expectation due to leadership failure. The study made use of the transformational leadership theory. The theory believed in the leader’s ability to motivate the follower to accomplish more than what the followers planned to do by concentrating on the followers values and helping the followers align these values with the values of the organization. Based on the above, recommendations were given on the need for effective leadership if results must be achieved in an organization. Keywords: Leadership, organization, performance

Marine fish landings in West Bengal during 2016 - An overview

A remarkable increase in marine fish landings in West Bengal was recorded in 2016. The estimated total marine fish landings with a 129% upsurge reached 2.72 lakh t from the 1.19 lakh t recorded in 2015. Almost all the main finfish resources showed an increase but the exceptional dominance was of Hilsa shad. Its estimated landings touched a record high of 89,109 t from the 16,273 t recorded in 2015. The increase was found to sustain throughout the year except during the fishing ban (April-May) period and in November and December

3′-Benzoyl-1′-methyl-4′-phenyl­spiro[acenaphthyl­ene-1(2H),2′-pyrrolidin]-2-one

In the title compound, C29H23NO2, the pyrrolidine ring adopts a twisted conformation about one of the C—N bonds. The acenaphthone ring (r.m.s. deviation = 0.025 Å) lies almost perpendicular to the pyrrolidine ring [dihedral angle = 88.08 (8)°]. The dihedral angle between the phenyl rings is 88.12 (11)°. In the crystal structure, weak C—H⋯π inter­actions connect the mol­ecules