Cosmology with Gamma-Ray Bursts Using k-correction

In the case of Gamma-Ray Bursts with measured redshift, we can calculate the k-correction to get the fluence and energy that were actually produced in the comoving system of the GRB. To achieve this we have to use well-fitted parameters of a GRB spectrum, available in the GCN database. The output of the calculations is the comoving isotropic energy E_iso, but this is not the endpoint: this data can be useful for estimating the {\Omega}M parameter of the Universe and for making a GRB Hubble diagram using Amati's relation.Comment: 4 pages, 6 figures. Presented as a talk on the conference '7th INTEGRAL/BART Workshop 14 -18 April 2010, Karlovy Vary, Czech Republic'. Published in Acta Polytechnic

Antenna Diversity on a UMTS HandHeld Phone

This work investigates the possible return of antenna diversity on the handheld phone in a bandwidth cor-responding to UMTS. The findings are that the diversity gain will change significantly dependent on the person using the phone. The diversity gain is found to be between 2 and 7 dB. This is primaryly caused by different slow fading from the two different types of antennas. The investigations are based on measurements where 200 test persons have been measured

Computation of Delay Spread using 3D Measurements

This paper proposes a new method for computing the delay spread (DS) of the mobile radio channel. The method utilizes a 3D measurement of the received signal at a given position and assumes knowledge of the receiver antenna radiation pattern. The main advantage of this method is that it allows testing of different antennas with only one propagation measurement. It also enables easy DS computation for different orientations of the receiver antenna. The paper describes the new method and investigates its performance by comparing the computed DS values with DS values obtained from measurements directly with the tested antennas. Three typical cellular handset antennas have been used. In addition the variation in DS is shown as function of azimuth rotation of the antenna

The Psychometric Properties of the Hypersexual Behavior Inventory Using a Large-Scale Nonclinical Sample

The conceptualization of hypersexuality has begun to converge as a result of proposed diagnostic criteria. However, its measurement is still diverse. The Hypersexual Behavior Inventory (HBI) is one of the most appropriate scales used to assess hypersexuality, but further examination is needed to test its psychometric properties among different clinical and nonclinical groups, including samples outside of the United States. The aim of the present study was to investigate the reliability and the generalizability of HBI and to determine a cutoff score on a large, diverse, online, nonclinical sample (N = 18,034 participants; females = 6132; 34.0%; M-age = 33.6 years, SDage = 11.1). Confirmatory factor analysis (CFA) and reliability indices provided support for the structure of the HBI and demonstrated excellent reliability. Employing latent profile analysis (LPA), seven classes emerged, but they could not be reliably distinguished by objective sexuality-related characteristics. Moreover, it was not possible to determine an adequate cutoff score, most likely due to the low prevalence rate of hypersexuality in the population. HBI can be reliably used to measure the extent of hypersexual urges, fantasies, and behavior; however, objective indicators and a clinical interview are essential to claim that a given individual may exhibit features of problematic sexual behavior