Joule-Thomson Expansion of Charged AdS Black Holes

In this paper, we study Joule-Thomson effects for charged AdS black holes. We obtain inversion temperatures and curves. We investigate similarities and differences between van der Waals fluids and charged AdS black holes for the expansion. We obtain isenthalpic curves for both systems in $T-P$ plane and determine the cooling-heating regions.Comment: 7 pages, 5 figures. Minor revisions. Typos and project number corrected. References improve

Joule-Thomson Expansion of Kerr-AdS Black Holes

In this paper, we study Joule-Thomson expansion for Kerr-AdS black holes in the extended phase space. Joule-Thomson expansion formula of Kerr-AdS black holes is derived. We investigate both isenthalpic and numerical inversion curves in the T-P plane and demonstrate the cooling-heating regions for Kerr-AdS black holes. We also calculate the ratio between minimum inversion and critical temperatures for Kerr-AdS black holes.Comment: 10 pages, 3 figures. Minor revision

The effect of excess Y2O3 addition on the mechanical properties of melt-processed YBCO superconductor

In this study, two kinds of melt-processed YBCO samples with Y2O3 addition were fabricated and their microstructures were defined by XRD analysis and polarized light optical microscopy. The mechanical properties of these compounds have been investigated by measuring the Vickers hardness. The superconducting transition temperature was determined by inductive measurements for oxygenated and non-oxygenated samples. The compacted powders were located on a crucible with a buffer layer of Y2O3 and a crucible with Y2O3 powder freely poured to avoid liquid to spread on the furnace plate. It was found that the sample located on crucible with freely poured Y2O3 powder has shown almost single crystal and indicated a very sharp transition curve

The Effect of Y2O3 on AC susceptibility measurements of MPMG YBCO superconductor

Meeting: 3rd International Conference on Superconductivity and Magnetism (ICSM) Location: Istanbul, TURKEY Date: APR 29-MAY 04, 2012In this study, two kinds of melt-powder-melt-growth (MPMG) YBCO sample grown on a buffer layer of Y2O3 addition were fabricated. The compacted powders were located on a crucible with Y2O3 powder freely poured and a buffer layer of pressed Y2O3. AC susceptibility measurements of the samples as a function of temperature was reported for several different AC magnetic-field amplitudes (H (ac) ) in the presence of static bias magnetic field (H (b) ) directed along H (ac) . The loss peaks are found to shift towards lower temperatures as the AC field strength is increased. The frequency effect on the AC susceptibility was also measured. As the frequency increases, the peak temperature shifts to higher temperature. This effect can be interpreted in terms of flux creep

Business analytics adoption and technological intensity: An efficiency analysis

Despite the overwhelming popularity of business analytics (BA) as an evidence-based decision support mechanism, the impact of its adoption on organizational performance has received scant attention from the research community. This study aims to unfold the adoption efficiencies of BA and its applications by proposing a data envelopment analysis (DEA) methodology to holistically assess the underlying factors with respect to the level of achievement regarding organizational performance, operational performance, and financial performance. Furthermore, the study unveils the firm-level and sectoral-level discrepancies in BA adoption efficiency in different industry settings. Relying on survey data obtained from 204 executives in various industries, this study provides empirical support for the cross-industry differences in BA adoption efficiencies. The results show that the firms in low-tech industries seem to achieve the highest efficiency from adopting BA regarding its influence on firm performance

Information system capabilities and firm performance:opening the black box through decision-making performance and business-process performance

This study contributes to the extant literature on information management by investigating the interrelation-ships between information systems (IS)-related capabilities and their effects on firm performance. Using theresource-based view (RBV), a set of hypotheses is formulated to examine these links, considering the role thatmay be played by decision-making performance and business-process performance as mediating variables.Structural equation modeling (SEM) has been applied to a sample of 204 firms in Turkey. The test resultsobtained confirm the proposed serially mediating model according to which decision-making performance andbusiness-process performance play a critical mediating role in the human resource and administrative-related IScapabilities, and firm-performance relationships. No support, however, has been found concerning the serialmediation effect between infrastructure-related IS capabilities and firm performanc

Anomalous Rotational Relaxation: A Fractional Fokker-Planck Equation Approach

In this study we obtained analytically relaxation function in terms of rotational correlation functions based on Brownian motion for complex disordered systems in a stochastic framework. We found out that rotational relaxation function has a fractional form for complex disordered systems, which indicates relaxation has non-exponential character obeys to Kohlrausch-William-Watts law, following the Mittag-Leffler decay.Comment: Revtex4, 9 pages. Paper was revised. References adde

Kaotik Evren Teorisi Fizikte Paradigma Değişimi Öngörüyor

İstanbul Üniversitesi Fen Fakültesi Öğretim Üyesi Prof. Dr. Ekrem Aydıner “Kaotik Evren Teorisi”ni öneren makalesi ile dünyanın en önemli fizik dergilerinden biri olan NATURE tarafından yapılan Dünya Fizik Sıralaması’nda (Top 100 in Physics) ikinci sırada yer aldı

Memory effects and KWW relaxation of the interacting magnetic nano particles

Carry out of the mechanism of the slow relaxation in the interacting magnetic nano particles which are used technology and biomedicine applications such as drug delivery, ferrofluids mechanics, magnetic data storage, sensors, magnetic resonance imaging and cancer therapy is very important. Therefore in this study, to model of the relaxation and investigate frequency and temperature behavior depends on slow relaxation, we used a simple operator formalism. We show that relaxation deviates from Debye and obeys to KWW and frequency and temperature behavior depends on KWW relaxation. We conclude that obtained results are consistent with experimental results and the simple model, presented here, is very useful to model the slow relaxation of the interacting nano particles.http://arxiv.org/abs/2103.0085