in the present paper the linear oscillator in r3 with z =constanthas been considered. the aim is to determine the necessary conditions forthe persistence of periodic solutions under discontinuous perturbations. a newapproach based on a computational method has been used. at the end weapply our method on an example.

we aimed to evaluate the timeliness of reporting of malaria surveillance system and understanding the existing problems.the timeliness of malaria surveillance system of iran was evaluated in four provinces of iran including sistan & baluchistan, hormozgan, kerman (as provinces with local malaria transmission) and khuzestan (without local malaria transmission). in this descriptive-analytic cross...

we describe a 40-year-old woman presenting with headache, nausea, episodic amnesia and blurred optic disc. brain mri disclosed diffuse leptomeningeal enhancement. csf analysis showed aseptic meningitis with elevated ace level. neurosarcoidosis was diagnosed based on granulomatosis changes on tissue biopsy.

background & objectives: the accurate assessment of the diseased tissue is fundamental to the diagnosis and management of disorders of the central nervous system (cns). the ‛squash’ or ‛crush’ technique has been universally employed in the intraoperative diagnosis of cns tumors. the aim of our study was to evaluate the accuracy of squash preparation in diagnosing cns tumors by comparing wit...

in this paper we introduce the concept of entropy operator for continuous systems of finite topological entropy. it is shown that it generates the kolmogorov entropy as a special case. if $phi$ is invertible then the entropy operator is bounded with the topological entropy of $phi$ as its norm.

conclusions it is suggested that the steward of health in iran, the ministry of health, develops an appropriate infrastructure and finally puts a high priority on the implementation of the health information management system for elderly health sector in iran. background there are increasing change and development of information in healthcare systems. given the increase in aging population, man...

stewardship is not a new concept for public policy, but has not been used to its optimum by the health policy-makers. although it is being practiced in most successful models of health system, but the onus to this function is still due till date. lately, few experts in world health organization (who) have realized its importance and have been raising the issue at different platforms to pursue t...

background about one third of unwanted reported medication consequences are due to medication errors, resulting in one-fifth of hospital injuries. objectives the aim of this study was determined formal and informal medication errors of nurses and the level of importance of factors in refusal to report medication errors among nurses. patients and methods the cross-sectional study was done on the...

background: iodine deficiency disorders (idd) have been recognized as a major public health problem worldwide. consequences of idd include goiter, hypothyroidism, and intellectual disability followed by retarded growth and development of the brain. this report aimed to determine the state of idd in fars province, south of iran. methods: in this study, we gathered data from all scientific papers...

the purpose of the current research is investigating the phenylalanine removal by using magnetic nanoparticles (fe3o4) from water samples. the effect of ph, contact time and phenylalanine concentration on phenylalanine adsorption efficiency by magnetite nanoparticles are studied in a batch system. transmission electron microscopy (tem), x-ray diffraction patterns (xrd) and fourier transform inf...