Search results for "P P"

BIOCHARS IN SOILS: TOWARDS THE REQUIRED LEVEL OF SCIENTIFIC UNDERSTANDING

2017

The special issue on Biochar as an Option for Sustainable Resource Management Key priorities in biochar research for future guidance of sustainable policy development have been identified by expert assessment within the COST Action TD1107. The current level of scientific understanding (LOSU) regarding the consequences of biochar application to soil were explored. Five broad thematic areas of biochar research were addressed: soil biodiversity and ecotoxicology, soil organic matter and greenhouse gas (GHG) emissions, soil physical properties, nutrient cycles and crop production, and soil remediation. The highest future research priorities regarding biochar’s effects in soils were: functional …

Primary and secondary distributions after a small-amplitude potential step at disk electrode coated with conducting film

2011

Abstract The set of equations and boundary conditions for the “primary potential/current distribution” after a small-amplitude potential step has been analyzed for a film-coated disk electrode in contact with an electrolyte. The solution of these equations provides the overall short-time resistance of this system, Rtot, which is determined by the short-time resistance of the electrolyte solution in contact with the bare disk electrode, Rs, and the short-time film resistance to the current passage in the normal direction, R f = L f / κ f π r o 2 (ro, disk radius; Lf, film thickness; κf, its specific conductivity). The deviation of Rtot from the sum of these resistances, Rs + Rf, originates f…

Acid versus base peptization of mesoporous nanocrystalline TiO2 films: functional studies in dye sensitized solar cells

2005

We report an analysis of the influence of acid/base conditions employed in the synthesis of TiO2 nanoparticles upon the performance of dye sensitised photoelectrochemical solar cells fabricated from these particles. The functional properties of the TiO2 nanoparticles in these devices are investigated by potential step chronoamperometry, transient laser spectroscopy, and photovoltaic device characterisation. We find that base peptization conditions employed in the sol–gel fabrication of the TiO2 nanoparticles result in a reduction in film electron density under negative applied bias, correlated with slower interfacial recombination losses and a higher device open circuit voltage.

ON THE ONE-DIMENSIONAL SCHRÖDINGER EQUATION WITH A QUASI-PERIODIC POTENTIAL

1980

ICA of full complex-valued fMRI data using phase information of spatial maps.

2015

Background ICA of complex-valued fMRI data is challenging because of the ambiguous and noisy nature of the phase. A typical solution is to remove noisy regions from fMRI data prior to ICA. However, it may be more optimal to carry out ICA of full complex-valued fMRI data, since any filtering or voxel-based processing may disrupt information that can be useful to ICA. New method We enable ICA of the full complex-valued fMRI data by utilizing phase information of estimated spatial maps (SMs). The SM phases are first adjusted to properly represent spatial phase changes of all voxels based on estimated time courses (TCs), and then these are used to segment the voxels into BOLD-related and unwant…

Stato e conservazione di Paracentrotus lividus nell’ AMP Plemmirio.

2011

Wing morphometrics as a possible tool for the diagnosis of the Ceratitis fasciventris, C. anonae, C. rosa complex (Diptera, Tephritidae)

2015

Abstract Previous attempts to resolve the Ceratitis FAR complex (Ceratitis fasciventris, Ceratitis anonae, Ceratitis rosa, Diptera, Tephritidae) showed contrasting results and revealed the occurrence of five microsatellite genotypic clusters (A, F1, F2, R1, R2). In this paper we explore the potential of wing morphometrics for the diagnosis of FAR morphospecies and genotypic clusters. We considered a set of 227 specimens previously morphologically identified and genotyped at 16 microsatellite loci. Seventeen wing landmarks and 6 wing band areas were used for morphometric analyses. Permutational multivariate analysis of variance detected significant differences both across morphospecies and g…

Tīmekļa vietnes aizmugursistēmas ātrdarbības uzlabošana mērogojamības nodrošināšanai

2018

Kvalifikācijas darbā “Tīmekļa vietnes aizmugursistēmas ātrdarbības uzlabošana mērogojamības nodrošināšanai” ir veikta tiešsaistes interneta veikala sistēmas, kas balstīta uz atklātā koda ietvara Opencart, izstrāde veiktspējas uzlabošanai. Uzlabojumi veikti sistēmas dzinēja PHP kodā un MySQL DBPS, panākot efektīvāku sistēmas resursu izmantošanu. Ieviests meklēšanas dzinējs Sphinxsearch un uzlabota satura kešdarbe. Sistēma nodrošina atbilstošu ātrdarbību pie 1 000 000 produktu vienībām un 14 000 produktu kategorijām. Tīmekļa vietne tiek pilnvērtīgi izmantota produkcijā.

Actionnariat salarié et création de valeur dans le cadre d'une gouvernance actionnariale et partenariale : application au contexte français

2010

The present thesis investigates the nature of relationship between the employee stock ownership and the wealth creation, in the framework of the shareholder governance and the stakeholder governance. Results indicate a non linear relation between both the employee stock ownership and the shareholder value creation taking an inversed-U form. In fact, a positive relation associates these variables for low levels of employee stock ownership. Starting from a level of 3%, the relation became negative. Results notice also a positive impact of employee stock ownership plan on the share of value allocated to employees when the percentage of employee stock ownership is significant. Under than 3% the…

Review of photovoltaic status in a European (EU) perspective

2011

In the EU continent, a generation cost around 0.15€/kWh has been achieved [1]. Around the world, there is a mission to stimulate this green source of energy and it is believed that by 2030, PV will be able to deliver around 9 % of the world's electricity demands. According to an International Energy Agency (IEA) report [2], it is expected that PV will accomplish grid parity in at least 10% of the world by 2020. There was a significant 60 % annual growth in the grid connected PV systems in the span of 2004–2009 [3]. The present article will bring out the status & review of PV technology and the details of PV system standards as suggested by IEA. In the present paper, the main attention has b…