نتایج جستجو برای: cell phones
تعداد نتایج: 1695289 فیلتر نتایج به سال:
Background: There is a great concern for the possible adverse effects of cell phones’ microwaves. Contradictory results, however, have been reported for the effects of these waves on the body. In the present study, the effect of cell phone microwaves on sperm parameters and total antioxidant capacity was investigated with regard to the duration of exposure and the amount of the frequency of the...
introduction: the use of mobile communication systems has dramatically increased over the past decade. although many studies have been performed to determine the effect of radio frequency (rf) but less attention has been paid to the possible biological impact of exposure to extremely low frequency (elf) components. the objective of this study is two folds. one is to design the ...
Implementation of Bangla Speech Recognition System on Cell Phones Speech Recognition refers to the process of converting analogue speech signals into text. Since the 1970s a lot of work has undergone in this particular field. The complex nature of speech due to it's contextual meaning , dialects, accents as well as the environment makes the task of recognizing speech very difficult. A lot of re...
In the most recent times, mobile visitors form the fastest growing Web community. The ease with which web pages or information is retrieved from the Web using PDAs or cell phones is a result of the rapid development in wireless technologies like GPRS, EDGE, etc. Also the development of educational technologies tends to be more mobile, portable and personalized. This development is quickly chang...
Wide concerns have been raised that the use of cell phones could increase brain tumors. This paper systematically reviews the scientific evidence regarding the associations between cell phone use and brain tumors. The authors’ review suggests two conclusions. First, it is still controversial in regard with the significant associations between cell phone use and increased risk of brain tumors. S...
Objective. To assess the use of cell phones and email as means of communication between pregnant women and their gynecologists and family physicians. Study Design. A cross-sectional study of pregnant women at routine followup. One hundred and twenty women participated in the study. Results. The mean age was 27.4 ± 3.4 years. One hundred nineteen women owned a cell phone and 114 (95%) had an ema...
The empirical basis for legislation to limit cell phones while driving is addressed. A comprehensive meta-analysis of the effects of cell phones on driving performance was performed. A total of 33 studies collected through 2007 that met inclusion criteria yielded 94 effect size estimates, with a total sample size of approximately 2000 participants. The dependent variables of reaction time, late...
Often, it has been observed that telecommunication infrastructure development and economic growth proceed together. While this relationship has been studied in the context of developed (OECD) countries, in this study, we investigate this simultaneous relationship between telecommunications and the economic growth, using data for developing countries. Using 3SLS, we estimate a system of equation...
4G will not facilitate the design of cell phones. Compared to today's 3G, future 4G multistandard, multi-band cellular phones have to cover an increasing number of wireless standards. These standards include GSM, CDMA, WCDMA, 3GPP LTE/4G, WIMAX and even MIMO WIMAX AND MIMO LTE/4G at up to 25 frequency bands, and includes connectivity systems like WLAN and Bluetooth, and support navigation syste...
OBJECTIVE To investigate the effect of cell phone use on various markers of semen quality. DESIGN Observational study. SETTING Infertility clinic. PATIENT(S) Three hundred sixty-one men undergoing infertility evaluation were divided into four groups according to their active cell phone use: group A: no use; group B: <2 h/day; group C: 2-4 h/day; and group D: >4 h/day. INTERVENTION(S) No...
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