Microstructure and impression creep characteristics Al-9Si-xCu aluminum alloys

The effects of 1.5, 2.5 and 3.5 wt.% Cu additions on the microstructure and creep behavior of the as-cast Al-9Si alloy were investigated by impression tests. The tests were performed at temperature ranging from 493 to 553 K and under punching stresses in the range 300 to 414 MPa for dwell times up to 3000 seconds. The results showed that, for all loads and temperatures, the Al-9Si-3.5Cu alloy had the lowest creep rates and thus, the highest creep resistance among all materials tested. This is attributed to the formation of hard intermetallic compound of Al2Cu, and higher amount of α-Al2Cu eutectic phase. The stress exponent and activation energy are in the ranges of 5.2- 7.2 and 115 -150 kJ/ mol, respectively for all alloys. According to the stress exponent and creep activation energies, the lattice and pipe diffusion- climb controlled dislocation creep were the dominant creep mechanism

Enhancing web application security through automated penetration testing with multiple vulnerability scanners.

Penetration testers have increasingly adopted multiple penetration testing scanners to ensure the robustness of web applications. However, a notable limitation of many scanning techniques is their susceptibility to producing false positives. This paper presents a novel framework designed to automate the operation of multiple Web Application Vulnerability Scanners (WAVS) within a single platform. The framework generates a combined vulnerabilities report using two algorithms: an automation algorithm and a novel combination algorithm that produces comprehensive lists of detected vulnerabilities. The framework leverages the capabilities of two web vulnerability scanners, Arachni and OWASP ZAP. The study begins with an extensive review of the existing scientific literature, focusing on open-source WAVS and exploring the OWASP 2021 guidelines. Following this, the framework development phase addresses the challenge of varying results obtained from different WAVS. This framework’s core objective is to combine the results of multiple WAVS into a consolidated vulnerability report, ultimately improving detection rates and overall security. The study demonstrates that the combined outcomes produced by the proposed framework exhibit greater accuracy compared to individual scanning results obtained from Arachni and OWASP ZAP. In summary, the study reveals that the Union List outperforms individual scanners, particularly regarding recall and F-measure. Consequently, adopting multiple vulnerability scanners is recommended as an effective strategy to bolster vulnerability detection in web applications

The impact of intellectual capital disclosure on common cost of equity in the companies listed in Tehran Stock Exchange

Nowadays, the use of non- tangible assets due to its competitive advantage has significant impact on the success and survival of organizations, hence the identification, measurement, and management of intellectual capital is of particular importance and makes real value of the organizations revealed. The impact of intellectual capital disclosures provides useful information to assist actual and potential investors in making rational decisions. The aim of this study was to investigate the impact of intellectual capital disclosure and its components on the sort of equity in the period of five years from 2008 to 2012 in the companies listed in Tehran stock exchange. Thus, 80 stock companies were considered as the samples and for this study, four hypotheses have been considered. The variables of the study were first identified and excel software was used to calculate the variables which are independent from Palyk model to measure the variables of the study. The data were analyzed by SPSS Statistics software version 20 and applying descriptive and inferential statistics such as correlation analysis, multiple regressions to test the hypotheses. The results of the statistical hypothesis test show there is a positive and significant relationship between intellectual capital disclosure and common Cost of equity. Also, the results indicated that the effect of the two components from the components of the intellectual capital - structural capital and human capital disclosure - on the independent variable, common Cost of equity, is not significant, but the impact of Capital Employed Disclosure on common cost of equity was significant, positive and reasonable

O efeito da qualidade da auditoria independente na relação entre estrutura de propriedade e evasão fiscal nas empresas listadas na bolsa de valores de Teerã

This research aims at the effect of ownership structure and also the interactive effect of the independent audit quality on tax avoidance of the listed companies in Tehran Stock Exchange. Therefore, this research tried to estimate the relationship between three variables of tax avoidance, ownership structure, and audit quality based on research model using varied concepts and theories about them. Statistical population of this research is the listed companies in Tehran Stock Exchange in 2011-2015. These samples include 100 companies with features of data accessibility, issuing financial statements in the mentioned years by stock exchange organization, etc. Findings of this research showed the negative and significant relationship between ownership structure in the listed companies in Tehran Stock Exchange, and audit quality also intensified the effect of ownership structure on tax avoidance.Esta investigación tiene como objetivo el studio del efecto de la estructura de propiedad y también el efecto interactivo de la calidad de la auditoría independiente sobre la evasión fiscal de las empresas cotizadas en la Bolsa de Teherán. Por lo tanto, esta investigación trató de estimar la relación entre tres variables de evitación de impuestos, estructura de propiedad y calidad de auditoría basada en el modelo de investigación utilizando conceptos variados y teorías sobre ellos. La población estadística de esta investigación es la lista de empresas en la Bolsa de Teherán en 2011-2015. Estas muestras incluyen 100 empresas con características de accesibilidad de datos, emitiendo estados financieros en los años mencionados por la organización bursátil, etc. Los hallazgos de esta investigación mostraron la relación negativa y significativa entre la estructura de propiedad en las compañías listadas en la Bolsa de Valores de Teherán y la calidad de auditoría también intensificó el efecto de la estructura de propiedad en la evasión fiscal.Esta pesquisa visa o efeito da estrutura de propriedade e também o efeito interativo da qualidade da auditoria independente sobre a evasão fiscal das empresas listadas na Bolsa de Teerã. Portanto, esta pesquisa tentou estimar a relação entre três variáveis de evasão fiscal, estrutura de propriedade e qualidade de auditoria com base no modelo de pesquisa, usando conceitos variados e teorias sobre eles. População estatística desta pesquisa é as empresas listadas na Bolsa de Valores de Teerã em 2011-2015. Essas amostras incluem 100 empresas com características de acessibilidade de dados, emitindo demonstrações financeiras nos anos mencionados pela organização da bolsa de valores, etc. Os resultados desta pesquisa mostraram a relação negativa e significativa entre a estrutura de propriedade nas empresas listadas na Bolsa de Valores de Teerã e a qualidade da auditoria. também intensificou o efeito da estrutura de propriedade sobre a evasão fiscal

The impact of intellectual capital disclosure on common cost of equity in the companies listed in Tehran Stock Exchange

Nowadays, the use of non- tangible assets due to its competitive advantage has significant impact on the success and survival of organizations, hence the identification, measurement, and management of intellectual capital is of particular importance and makes real value of the organizations revealed. The impact of intellectual capital disclosures provides useful information to assist actual and potential investors in making rational decisions. The aim of this study was to investigate the impact of intellectual capital disclosure and its components on the sort of equity in the period of five years from 2008 to 2012 in the companies listed in Tehran stock exchange. Thus, 80 stock companies were considered as the samples and for this study, four hypotheses have been considered. The variables of the study were first identified and excel software was used to calculate the variables which are independent from Palyk model to measure the variables of the study. The data were analyzed by SPSS Statistics software version 20 and applying descriptive and inferential statistics such as correlation analysis, multiple regressions to test the hypotheses. The results of the statistical hypothesis test show there is a positive and significant relationship between intellectual capital disclosure and common Cost of equity. Also, the results indicated that the effect of the two components from the components of the intellectual capital - structural capital and human capital disclosure - on the independent variable, common Cost of equity, is not significant, but the impact of Capital Employed Disclosure on common cost of equity was significant, positive and reasonable

Emotional and psychological consequences of infertility in a group of men with over 4 years of follow-up treatment: A Qualitative Study

Infertility is one of the problems that can be at the individual and social level. Little research has been done on individual infertility problems among men. The purpose of this study was to investigate the emotional and psychological consequences of infertility in a group of men with more than 4 years of follow-up treatment. Methods: This research was conducted in a descriptive qualitative way with the aim of extracting the emotional and psychological consequences of infertility in a sample of 16 men in Hamedan. According to the qualitative method, a semi-structured interview was used to collect information. Data were analyzed using content analysis. Results: The findings of this study displayed the three following main categories as the emotional and psychological consequences of infertility in men: social selfesteem (including fears of negative evaluation, having distress in discussions about childbirth, and tendency to loneliness), negative emotions (including categories of frustration and general inefficacy) and marital inadequacy. Conclusion: Infertile men, like infertile women, have emotional and psychological consequences that should be addressed in psychological training