On the Unit Graph of a Noncommutative Ring

Let $R$ be a ring (not necessary commutative) with non-zero identity. The unit graph of $R$, denoted by $G(R)$, is a graph with elements of $R$ as its vertices and two distinct vertices $a$ and $b$ are adjacent if and only if $a+b$ is a unit element of $R$. It was proved that if $R$ is a commutative ring and \fm is a maximal ideal of $R$ such that |R/\fm|=2, then $G(R)$ is a complete bipartite graph if and only if (R, \fm) is a local ring. In this paper we generalize this result by showing that if $R$ is a ring (not necessary commutative), then $G(R)$ is a complete $r$-partite graph if and only if (R, \fm) is a local ring and $r=|R/m|=2^n$, for some $n \in \N$ or $R$ is a finite field. Among other results we show that if $R$ is a left Artinian ring, $2 \in U(R)$ and the clique number of $G(R)$ is finite, then $R$ is a finite ring.Comment: 6 pages. To appear in Algebra Colloquiu

Hydrogen and muonic-Hydrogen Atomic Spectra in Non-commutative Space-Time

Comparing electronic Hydrogen with muonic Hydrogen shows that the discrepancy in measurement of the Lamb shift in the both systems are relatively of order of $(\frac{m_\mu}{m_e})^{4-5}$. We explore the spectrum of Hydrogen atom in noncommutative $QED$ to compare the noncommutative effects on the both bound states. We show that in the Lorentz violating noncommutative QED the ratio of NC-corrections is $(\frac{m_\mu}{m_e})^3$ while in the Lorentz conserving NCQED is $(\frac{m_\mu}{m_e})^5$. An uncertainty about $1 \,Hz\ll 3\,kHz$ in the Lamb shift of Hydrogen atom leads to an NC correction about $10 \,MHz$ in the Lorentz violating noncommutative QED and about $400 \,GHz$ in the Lorentz conserving noncommutative QED.Comment: 15 pages, to appear in EPJ

An empirical study on employees’ theft behavior in insurance industry

It is highly deplorable that every year, theft behavior among employees of insurance industry is growing throughout the world. A very significant sources of contraction (despite many costly technological and widespread security measures) which needs to be addressed and prevented. Employee and agent theft cannot be ignored as it causes significant losses to employers. This study investigates the workplace factors that affect the insurance employee and agent theft behavior. Although identifying theft is difficult, this study will help employers to further understand employees’ theft behavior. This study was conducted in two service small and medium organizations (two branches of insurance companies) in ALBORZ’s capital city, KARAJ. Data has been collected via questionnaire from 30 employees and agents consisting employees and supervisors of branches and agencies. According to the results, it must be acknowledged that compensation, organizational justice, internal control systems, penalties and personal characteristics were associated with employees' theft behavior, it is despite the fact that, no effect could be assumed for organizational ethics and requirement in this case. Nevertheless, poor financial status cannot be considered as the driving factor in pushing employees to steal property as well as increasing their theft behavior. As mentioned earlier, the purpose of this study was to determine the factors contributing to employees’ theft (insurance employees and agencies) behavior in insurance organizations in Karaj

An empirical study on employees’ theft behavior in insurance industry

It is highly deplorable that every year, theft behavior among employees of insurance industry is growing throughout the world. A very significant sources of contraction (despite many costly technological and widespread security measures) which needs to be addressed and prevented. Employee and agent theft cannot be ignored as it causes significant losses to employers. This study investigates the workplace factors that affect the insurance employee and agent theft behavior. Although identifying theft is difficult, this study will help employers to further understand employees’ theft behavior. This study was conducted in two service small and medium organizations (two branches of insurance companies) in ALBORZ’s capital city, KARAJ. Data has been collected via questionnaire from 30 employees and agents consisting employees and supervisors of branches and agencies. According to the results, it must be acknowledged that compensation, organizational justice, internal control systems, penalties and personal characteristics were associated with employees' theft behavior, it is despite the fact that, no effect could be assumed for organizational ethics and requirement in this case. Nevertheless, poor financial status cannot be considered as the driving factor in pushing employees to steal property as well as increasing their theft behavior. As mentioned earlier, the purpose of this study was to determine the factors contributing to employees’ theft (insurance employees and agencies) behavior in insurance organizations in Karaj

Optimizing linear alkyl benzene sulfonate removal using fenton oxidation process in taguchi method

Linear alkyl benzene sulfonate (LAS), which is the most common used anionic surfactant in detergents manufacturing, can discharge onto water resources through wastewater and causes change in taste and odor, disruption in water treatment processes, aquatics death, and oxygen transfer limitation. Accordingly, this article investigates to optimize LAS removal using Fenton oxidation process in Taguchi Method for the first time. LAS removal using Fenton oxidation was perused experimentally in a lab-scale reactor

Performance evaluation of green roofs in urban runoff reduction

Urbanism directly affects the hydrological cycle. One of the ways to manage runoffs in urban areas that is considered nowadays is green roof creation. Green roof is mainly created in humid and semi-humid areas, and efficiency of green roofs in arid and semi-arid areas has attracted less attention. In the current study, to evaluate the effect of green roof in arid and semi-arid to reduce runoff, an experimental green roof without vegetation was designed in Behbahan city of Khuzestan province in Iran. The city has an arid and semi-arid climate. Experimental Green roof was studied during 7 months. During the study, the data regarding the height of rainfall, soil moisture in different soil layers of the experimental green roof as well as the amount of output runoff were measured. The results showed that the amount of moisture in the surface layer of soil is severely affected by rainfall. The average surface soil moisture has been about 20.5 % and in the deep and middle layers has been 24.8 and 24.1, respectively. In addition, regarding runoff reduction and delays in creating runoff, the results showed that in the observed rain events, in average, 92.2 percent of volume of rainfall has been kept in soil, and has not been converted into runoff. Due to arid and semi-arid climate of the target area and high-intensity of rainfall, green roof can reduce a considerable percentage of runoff

Performance of Common Clustering Methods in Segmenting Vascular Pathologies in Capsule Endoscopy Images

This work was supported by the program Industria del Coneixement of the Catalan Government.Noorda, RA.; Naranjo Ornedo, V.; Pons, V. (2017). Performance of Common Clustering Methods in Segmenting Vascular Pathologies in Capsule Endoscopy Images. International Journal of Computer Assisted Radiology and Surgery. 12(1):S22-S23. https://doi.org/10.1007/s11548-017-1588-3SS22S2312