Large-amplitude electron-acoustic solitons in a dusty plasma with kappa-distributed electrons

The Sagdeev pseudopotential method is used to investigate the occurrence and the dynamics of fully nonlinear electrostatic solitary structures in a plasma containing suprathermal hot electrons, in the presence of massive charged dust particles in the background. The soliton existence domain is delineated, and its parametric dependence on different physical parameters is clarified.Comment: 3 pages, 1 figure, presented as a poster at the 6th International Conference on the Physics of Dusty Plasmas (ICPDP6), Garmisch-Partenkirchen, Germany, 201

Adaptive transformation for robust privacy protection in video surveillance

10.1155/2012/639649Advances in Multimedia201

Local structure of REFeAsO (RE=La, Pr, Nd, Sm) oxypnictides studied by Fe K-edge EXAFS

Local structure of REOFeAs (RE=La, Pr, Nd, Sm) system has been studied as a function of chemical pressure varied due to different rare-earth size. Fe K-edge extended X-ray absorption fine structure (EXAFS) measurements in the fluorescence mode has permitted to compare systematically the inter-atomic distances and their mean square relative displacements (MSRD). We find that the Fe-As bond length and the corresponding MSRD hardly show any change, suggesting the strongly covalent nature of this bond, while the Fe-Fe and Fe-RE bond lengths decrease with decreasing rare earth size. The results provide important information on the atomic correlations that could have direct implication on the superconductivity and magnetism of REOFeAs system, with the chemical pressure being a key ingredient

Induction of Mutation in Rough Lemon (Citrus jambhiri Lush.) Using Gamma Rays

The present investigation was carried out to study variability induced by gamma rays with respect to vegetative characters and LD50 dose in Rough lemon. Rough lemon seeds were gamma irradiated at doses of 0, 4, 6 and 8 kr along with control. Seed germination decreased with increasing dose of gamma radiation. Seedling height and leaf size also decreased with increasing dose of gamma radiation, whereas, apical branching, number of branches/seedling, number of variegated / albino seedlings and number of leaves increased with increasing dose of gamma radiation. Maximum variability for seedling height, number of leaves, leaf size, colour, internode length, and per cent apical branching was observed at two months from sowing in seeds treated with 8 kr dose of gamma radiation. Variability for all characters was, however, found to be minimum in the control

Identification of Microbial Population during Oil Palm Frond (OPF) Composting using Light and Scanning Electron Microscopy

This investigation highlights the activity and diversity of fungal population observed on oil palm fronds (OPF) during composting process employing Scanning Electron Microscope (SEM) and conventional identification methods. Composting is a controlled biological decomposition process, which converts organic wastes into humus-like material. It is a process that involves microbial degradation of complex organic materials under moist, self-heating and aerobic conditions; and characterized by a succession of various microbial populations. Two white rot fungi species were introduced as inoculant, namely Trametes versicolor and Schizophyllum commune. The main objective for inoculation was to shorten the composting period and produce high quality compost. In this study, the oil palm fronds (OPF) were composted for 14 weeks, with four treatment; i) control (untreated OPF), ii) OPF treated with T. versicolor, iii) OPF treated with S. commune, iv) OPF treated with both T. versicolor and S. commune, and four replicates for each. A total of eight genera of fungi namely Aspergillus, Trichoderma, Absidia, Geotrichum, Trametes, Schizophyllum, Syncephalastrum and Beauveria species were isolated and identified from composted OPF. Although T. versicolor and S. commune were introduced as accelerating agents, the presence of other fungal species perhaps occurred due to the indigenous microflora that already existed on OPF, leading  to a succession of various fungi species based on the complexity of biological process in composting substrate. Keywords: Composting, oil palm frond, white-rot fungi, inoculants, Trametes versicolor, Schizophyllum commune ABSTRAKKajian ini menumpukan kepada aktiviti dan kepelbagaian populasi kulat yang terdapat pada pelepah sawit sepanjang tempoh pengkomposan, dengan menggunakan Mikroskop Elektron Pengimbas (SEM) dan teknik identifikasi konvensional. Pengkomposan merupakan proses penguraian biologi terkawal, yang menukarkan sisa organik kepada bahan-seperti-humus. Ia adalah suatu proses yang melibatkan penguraian mikrob terhadap bahan organik kompleks dalam keadaan lembap, pemanasan-diri dan aerobik; dan proses ini dicirikan oleh sesaran pelbagai jenis populasi mikrob. Dua spesies kulat pereput putih iaitu Trametes versicolor dan Schizophyllum commune telah diperkenalkan sebagai inokula dalam pengkomposan pelepah sawit. Objektif utama inokulasi adalah untuk memendekkan tempoh pengkomposan dan menghasilkan kompos berkualiti tinggi. Dalam kajian ini, pelepah sawit dikomposkan selama 14 minggu, dengan empat rawatan yang digunakan iaitu; i) kawalan (pelepah tidak dirawat), ii) pelepah dirawat dengan T. versicolor, iii) pelepah dirawat dengan S. commune, iv) pelepah dirawat dengan T. versicolor dan S. commune, dengan empat replikasi. Secara keseluruhannya, terdapat lapan genus kulat, iaitu Aspergillus, Trichoderma, Absidia, Geotrichum, Trametes, Schizophyllum, Syncephalastrum dan Beauveria telah diasingkan dan dikenalpasti dalam kompos pelepah sawit. Walaupun T. versicolor dan S. commune telah diperkenalkan sebagai agen pecutan, kehadiran pelbagai populasi kulat lain mungkin dipengaruhi oleh mikroflora semulajadi yang hadir dalam substrat pengkomposan, serta proses sesaran pelbagai spesies kulat yang bergantung kepada proses biologi kompleks yang berlaku dalam substrat pengkomposan.  Kata kunci: Pengkomposan, pelepah sawit, kulat pereput putih, inokula, Trametes versicolor, Schizophyllum commun

Orbital Degeneracy and Peierls Instability in Triangular Lattice Superconductor Ir1−x_{1-x}Ptx_xTe2_2

We have studied electronic structure of triangular lattice Ir$_{1-x}$Pt$_x$Te$_2$ superconductor using photoemission spectroscopy and model calculations. Ir $4f$ core-level photoemission spectra show that Ir $5d$ $t_{2g}$ charge modulation established in the low temperature phase of IrTe$_2$ is suppressed by Pt doping. This observation indicates that the suppression of charge modulation is related to the emergence of superconductivity. Valence-band photoemission spectra of IrTe$_2$ suggest that the Ir $5d$ charge modulation is accompanied by Ir $5d$ orbital reconstruction. Based on the photoemission results and model calculations, we argue that the orbitally-induced Peierls effect governs the charge and orbital instability in the Ir$_{1-x}$Pt$_x$Te$_2$.Comment: 5 pages,4 figure