نتایج جستجو برای: Electromagnetic waves
تعداد نتایج: 181493 فیلتر نتایج به سال:
Introduction: The highest electromagnetic radiation pollution is related to the radiofrequency waves of mobile phones (1). Up to 70% of these waves can be absorbed by various tissues (2). Absorption of these waves can damage the body tissues by causing oxidative stress (3). Given that melatonin plays an antioxidant role, it seems that this hormone can have a protective effect on the hepato- tox...
physical agents such as ultraviolet or ionizing radiation and repetitive trauma have been related to the causation of cancer in humans. much less clear is the association between exposure to radiofrequency, such as radar and microwave radiation to the development of cancer. sporadic case reports and small series suggest that this type of radiation might lead to cancer or contribute to its evolu...
background : now a days researchers have shown grean interest in electromagnetic waves which spread from devices such az microwaves,satellites,tv,cell phones etc,due to various reports of their devasting effects on animal growth and health.in this study the effects of these radiations on blood cells is investigated . methods : in the present study the effect of radiation on blood parameters in ...
Introduction: The exposure of human brain to electromagnetic waves can show adverse effects on brain functions. Electromagnetic waves effects on adult and child head have been investigated and compared In the present study. Methods and Materials: A simple spherical model consisted of six layers is considered to simulate the behavior of human brain. HFSS (High Frequency Structure Simulator) ha...
In order to investigate the effect of an electromagnetic field and ultrasonic waves on the seed germination of Cuminum cyminum that two separate experiments using a completely randomized design with four replications was conducted at Seed Science and Technology Laboratory of Faculty Agricultural Sciences, the Shahed University of Tehran in 2012. In the first experiment, for the seeds of zero, 1...
a complete linear theory in four dimensional space-time is constructed for propagation and coupling of electromagnetic waves in the most general case, i.e. media where all three space directions are in homogeneous and where temporal changes, anisotropy and absorbtion are also included. the only condition is that the properties of the medium should be slowly varying, although it is assumed that ...
Background & Objective: The necessity of using wireless communications and the use of electromagnetic waves in today's world is obvious to everyone. Using of these equipment and development of them, although have many benefits but causes some anxiety on the way in which they influence on environment. One of the most effective ways of decreasing the unwanted effects of these waves is using of t...
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Background and Objectives: with the developments of technology, contact with various frequencies of electromagnetic fields ( EMF ) has significantly increased, while the abundant benefits of using microwaves in routine life cannot be neglected. During recent years there have been reports of adverse effects caused by contact with electric and magnetic fields of these waves that spread from BTS a...
Background: The increasing use of telecommunication devices such as Wi-Fi modems and mobile phones in the recent years can change the cellular structure of microorganisms so the generation of electromagnetic waves has led to concern in the community whenever be exposed to these fields and may have harmful effects on human health.Material and Methods: Standard strains of bacteria were prepared o...
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