Homotheties of a Class of Spherically Symmetric Space-Times Admitting G3G_3 as Maximal Isometry Group

The homotheties of spherically symmetric spacetimes admitting $G_4$ , $G_6$ and $G_{10}$ as maximal isometry groups are already known, whereas for the space-times admitting $G_3$ as isometry groups, the solution in the form of differential constraints on metric coefficients requires further classification. For a class of spherically symmetric space-times admitting $G_3$ as maximal isometry groups without imposing any restriction on the stress-energy tensor, the metrics along with their corresponding homotheties are found. For the one case the metric is found along with its homothety vector that satisfies an additional constraint and is illustrated with the help of an example of a metric. For another case the metric and the corresponding homothety vector are found for a subclass of spherically symmetric space-times for which the differential constraint is reduced to separable form. Stress-energy tensor and related quantities of the metrics found are given in the relevant section.Comment: 09 page

Moderating effect of social support on personal financial constraints and job stress relationship

The aim of this paper is to examine the moderating effect of social support (which may be supervisory, friends, family and relatives) on the relationship of personal financial constraints and job stress relationship. Sample consists of 294 respondents from randomly selected 28 branches of 22 banks located across all major cities of Pakistan. Moderated regression analysis has been used to test the hypothesized relationships. Personal financial constraints enhance job stress and social support moderates this relationship. Job stress increases when an employee faces financial constraints but decreases in the presence of social support. Practical and theoretical implications are drawn. This research is conducted in banking industry, so its results can’t be generalized to other industries. This paper is the first which examines the impact of a non-work related variable, personal financial constraint on job stress along with buffering role of social support. Its findings have great implications for employers for increasing productivity of employees.Job stress, personal financial constraints, social support, moderating, banking, Pakistan

Influence of laser spot size at diffuser plane on the longitudinal spatial coherence function of optical coherence microscopy system

Coherence properties and wavelength of light sources are indispensable for optical coherence microscopy/tomography as they greatly influence the signal to noise ratio, axial resolution, and penetration depth of the system. In the present letter, we investigated the longitudinal spatial coherence properties of the pseudo-thermal light source (PTS) as a function of spot size at the diffuser plane, which is controlled by translating microscope objective lens towards or away from the diffuser plane. The axial resolution of PTS is found to be maximum ~ 13 microns for the beam spot size of 3.5 mm at the diffuser plane. The change in the axial resolution of the system as the spot size is increased at the diffuser plane is further confirmed by performing experiments on standard gauge blocks of height difference of 15 microns. Thus, by appropriately choosing the beam spot size at the diffuser plane, any monochromatic laser light source depending on the biological window can be utilized to obtain high axial-resolution with large penetration depth and speckle-free tomographic images of multilayered biological specimens irrespective of the source temporal coherence length. In addition, PTS could be an attractive alternative light source for achieving high axial-resolution without needing chromatic aberration corrected optics and dispersion-compensation mechanism, unlike conventional setups.Comment: 11 pages, 4 figures. arXiv admin note: text overlap with arXiv:1810.0199

Factors influencing intention to create new venture among young graduates

The purpose of this paper is to investigate the factors that are influencing the young graduates for intention to create new venture. The study further highlights how the attraction, networking support, entrepreneurial capabilities, self-independence and self-reliance influence the young students to initiate their new businesses. The sample size of this study was 255 final semester students of various disciplines in different universities from Islamabad and Rawalpindi. The survey based questionnaire was used for data collection. Based on findings this study concludes that all variables, included in the study, play a vital role in new venture creation. Therefore, on the basis of findings this study concludes that young students are more motivated towards new venture creation and start their own businesses.Influencing factors, new venture creation, different disciplines, young graduates, motivation

Space-filling, multi-fractal, localized thermal spikes in silicon, germanium and zinc oxide

The mechanism responsible for the emission of clusters from heavy ion irradiated solids is proposed to be thermal spikes. Collision cascade-based theories describe atomic sputtering but cannot explain the consistently observed experimental evidence for significant cluster emission. Statistical thermodynamic arguments for thermal spikes are employed here for qualitative and quantitative estimation of the thermal spike-induced cluster emission from silicon, germanium and zinc oxide. The evolving cascades and spikes in elemental and molecular semiconducting solids are shown to have fractal characteristics. Power law potential is used to calculate the fractal dimension.The fractal dimension is shown to be dependent upon the exponent of the power law interatomic potential. Each irradiating ion has the probability of initiating a space-filling, multi-fractal thermal spike that may sublime a localized region near the surface by emitting clusters in relative ratios that depend upon the energies of formation of respective surface vacancies.Comment: 16 pages, 6 figure

Impact of Brand Loyalty on Brand Extension

The key objective of this study is to explore the effects of different dimensions of brand loyalty towards the original brand on the evaluation of brand extensions. This was a primary research and questionnaire was distributed among 200 respondents and 183 were processed for analysis. The target respondents were the students of different universities of Islamabad and Rawalpindi, Pakistan. The scale was taken from the existing research (Hem and Iversen, 2003). SPSS was used to analyze the data. The result finds that there is positive and significant relationship between brand loyalty and brand extension. So on the bases of these results that all the hypotheses (H1, H2, H3, H4 and H5) are proved positively and significantly and affect the evaluation of brand extension. Keywords: Brand Loyalty, Brand Extension, original bran

Sustainability Check of Microfinance Institutions during Financial Crisis: Evidence from Pakistan

The study scrutinizes the efficiency and sustainability of Microfinance Institutions in Pakistan during financial crisis era for 2008 and 2009. For this progression, firstly Data Envelopment Analysis is applied to quantify efficiency and then sustainability check is tested. The results reveal that due to macroeconomic shocks, portfolio quality has been affected. More microfinance activities are being done in Punjab and Sindh whereas such high concentration increases multiple borrowing in market