The particle-hole continuum in the Dirac sea of graphene has a unique window underneath, which in principle leaves room for bound state formation in the triplet particle-hole channel (Baskaran and Jafari 2002 Phys. Rev. Lett. 89 016402). In this work, we construct appropriate triplet particle-hole operators and, using a repulsive Hubbard-type effective interaction, we employ equations of motio...

Mehdi Jafari, Arash Rashidian, Farid Abolhasani, Kazem Mohammad, Shahram Yazdani, Patricia Parkerton, Masud Yunesian, Feizollah Akbari and Mohammad Arab* Department of Health Services Management, School of Health Services Management, Iran University of Medical Sciences, Tehran, Iran Department of Health Management and Economics, School of Public Health, Tehran University of Medical Sciences, Te...

A Roman dominating function on a graph G = (V,E) is a function f : V → {0, 1, 2} such that every vertex v ∈ V with f(v) = 0 has at least one neighbor u ∈ V with f(u) = 2. The weight of a Roman dominating function is the value f(V (G)) = ∑ u∈V (G) f(u). The minimum weight of a Roman dominating function on a graph G is called the Roman domination number, denoted by γR(G). The Roman bondage number...

Employees are expected to perform specific roles in an organization as specified by their job descriptions and superior’s expectations. Bidarian Jafari (2012) found that employees play important role activities the organization, such social interaction with colleagues leaders conduct activities. These extra-role behavior’ behaviors termed Organizational Citizenship Behavior (OCB). Although many...

A chameleon chaotic system is a in which the attractor can change between hidden and self-excited depending on values of parameters. In this work, we construct family nine new systems by introducing two parameters to 3-D with quadratic nonlinearities exhibiting line equilibrium points analyzed Jafari Sprott (2013). analysis flow systems, discover three categories attractors (no equilibria, one ...

one of the main factor of self- alienation is establishment and development of huge, complex and bureaucratic organizations. since the study of these organization, their effects on man’s efficiency, mental and physical health are this considerable cases which has considered by management. therefore, man’s alienation deliberation in industrial and administrative departments and labor relations i...

the main purpose of this study is the explanation of beauty nature and inducing about implications of aesthetic education in terms of kant's and allameh jafari. reaching for this purpose we use the content analysis and logical deduction among the research methods. on the basis of the research findings, kant's definition of beauty as »universal consent, the essential and without of concept, inte...

Clostridium difficile infection (CDI) is the leading cause of hospital and community-acquired antibiotic-associated diarrhoea and currently represents a significant health burden. Although the role and contribution of C. difficile toxins to disease pathogenesis is being increasingly understood, at present other facets of C. difficile-host interactions, in particular, bacterialdriven effects on ...