Testing the inversion of asteroids' Gaia photometry combined with ground-based observations

We investigated the reliability of the genetic algorithm which will be used to invert the photometric measurements of asteroids collected by the European Space Agency Gaia mission. To do that, we performed several sets of simulations for 10 000 asteroids having different spin axis orientations, rotational periods and shapes. The observational epochs used for each simulation were extracted from the Gaia mission simulator developed at the Observatoire de la C\^{o}te d'Azur, while the brightness was generated using a Z-buffer standard graphic method. We also explored the influence on the inversion results of contaminating the data set with Gaussian noise with different $\sigma$ values. The research enabled us to determine a correlation between the reliability of the inversion method and the asteroid's pole latitude. In particular, the results are biased for asteroids having quasi-spherical shapes and low pole latitudes. This effect is caused by the low lightcurve amplitude observed under such circumstances, as the periodic signal can be lost in the photometric random noise when both values are comparable, causing the inversion to fail. Such bias might be taken into account when analysing the inversion results, not to mislead it with physical effects such as non-gravitational forces. Finally, we studied what impact on the inversion results has combining a full lightcurve and Gaia photometry collected simultaneously. Using this procedure we have shown that it is possible to reduce the number of wrong solutions for asteroids having less than 50 data points. The latter will be of special importance for planning ground-based observations of asteroids aiming to enhance the scientific impact of Gaia on Solar system science.Comment: Accepted in MNRA

Flora and vegetation of walls in the town of Krosno Odrzanskie (Poland)

The flora and vegctation of walls in Krosno Odrzanskie (West Poland) is described based on field research conducted in 1999 and 2000. The vascular flora consists of 96 species from 35 families. Predomination of apophytes and plants capable of vegetation propagation was obscrved. i> Asplenietum trichomano-rutae-murariae and Cymbalarietum murales are reported for the first time from this region of Poland.A partir del trabajo de campo realizado entre 1999 y el 2000 se describe la flora y la vegetación de las paredes en Krosno Odazanskie (Polonia Occidental). 96 especies de 35 familias constituyen la flora vascular. Predominan los apófilos y plantas capaces de reproducirse vegetativamente. Las asociaciones Asplenietum trichomano-rutae-murariae y Cymbalarietum murales se citan por vez primera para esta región de Polonia

Exploring U.S. Air Force Online Communities of Practice: An Examination of Content Management Practices

The management of knowledge assets has become increasingly important as organizations recognize the strategic value of knowledge. In an attempt to capitalize on its potential, many organizations have turned to Internet technologies for capturing, managing and disseminating their vast amounts of explicit knowledge. One application of such technology can be found in the use of on-line collaborative workspaces. These virtual workspaces facilitate and promote an environment for capturing and sharing knowledge among members of a particular field, task, or common practice. Despite the implied efficiency of such an approach, an ever-increasing volume of information/knowledge may impede the ability of users to navigate successfully through the workspace thus undermining the user participation and illustrating the importance of effective content management (CM). This exploratory study uses case studies to examine the CM practices of eight U.S. Air Force online communities of practice. The findings suggest that the development of formal CM processes, and procedures may help solve future CM problems as well as increase the benefits associated with on-line CoP usage

Absolute properties of the main-sequence eclipsing binary FM Leo

First spectroscopic and new photometric observations of the eclipsing binary FM Leo are presented. The main aims were to determine orbital and stellar parameters of two components and their evolutionary stage. First spectroscopic observations of the system were obtained with DDO and PST spectrographs. The results of the orbital solution from radial velocity curves are combined with those derived from the light-curve analysis (ASAS-3 photometry and supplementary observations of eclipses with 1 m and 0.35 m telescopes) to derive orbital and stellar parameters. JKTEBOP, Wilson-Devinney binary modelling codes and a two-dimensional cross-correlation (TODCOR) method were applied for the analysis. We find the masses to be M_1 = 1.318 $\pm$ 0.007 and M_2 = 1.287 $\pm$ 0.007 M_sun, the radii to be R_1 = 1.648 $\pm$ 0.043 and R_2 = 1.511 $\pm$ 0.049 R_sun for primary and secondary stars, respectively. The evolutionary stage of the system is briefly discussed by comparing physical parameters with current stellar evolution models. We find the components are located at the main sequence, with an age of about 3 Gyr.Comment: 5 pages, 4 figures, to appear in MNRA

KM Capability Assessment: A Qualitative Approach

The knowledge management (KM) literature highlights both the desire of organizations to assess KM capability and the need to create better methodologies and tools to do so. Although some progress has been made in developing valid assessment tools, the topic still remains inadequately explored. Answering a call for the exploration of KM capability maturity assessment across a variety of organizations (Kulkarni & St Louis, 2003), this research uses the Knowledge Management Capability Assessment (KMCA) methodology (Kulkarni & Freeze, 2004) and Freeze & Kulkarni (2005; 2006) as a guiding framework to qualitatively assess the KM capability of the Secretary of the Air Force Financial Management and Comptroller (SAF/FM) organization—a military organization recognized for exceptional KM efforts. The research resulted in rich, contextual findings with regard to the specific KM efforts underway within SAF/FM. Interestingly, the nature of these efforts translated into KM capability levels lower than expected; however, precise areas for improvement were identified

Poor Linkage to Care Despite Significant Improvement in Access to Early cART in Central Poland - Data from Test and Keep in Care (TAK) Project

BACKGROUND: The main objective of the TAK project is investigating barriers in accessing HIV care after HIV-diagnosis at the CBVCTs of central Poland. Here we describe factors associated with and changes over time in linkage to care and access to cART. METHOD: Data collected in 2010–2013 in CBVCTs were linked with HIV clinics records using unique identifiers. Individuals were followed from the day of CBVCTs visit until first clinical visit or 4/06/2014. Cox-proportional hazard models were used to identify factors associated with being linked to care and starting cART. RESULTS: In total 232 persons were diagnosed HIV-positive and 144 (62.1% 95%CI: 55.5–68.3) persons were linked to care. There was no change over time in linkage to care (p = 0.48), while time to starting cART decreased (p = 0.02). Multivariate factors associated with a lower rate of linkage to care were hetero/bisexual sexual orientation, lower education, not having an HIV-positive partner and not using condoms in a stable relationship. Multivariate factors associated with starting cART were lower education, recent year of linked to care, and first HIV RNA and CD4 cell count. CONCLUSIONS: Benefits of linkage to care, measured by access to early treatment, steadily improved in recent years. However at least 1 in 3 persons aware of their HIV status in central Poland remained outside professional healthcare. Persons at higher risk of remaining outside care, thus target population for future interventions, are bi/heterosexuals and those with lower levels of education