نتایج جستجو برای: effects 85 or 90 dba
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SUMMARY DBA/2 mice inoculated with the strain-specific leukemia L1210 survived more than 50 days as a result of the combined effects of drug treatments and immunity. Differences in Li 210 immunogenicity were noted among 3 sublines of DBA/2 mouse strain. The therapeutic effects occurred also in DBA/2 sublines in which L1210 is weakly immunogenic and at drug doses which are immunodepressant per s...
OBJECTIVE To systematically evaluate the noise generated by toys targeted for children and to compare the results over the course of 4 consecutive holiday shopping seasons. STUDY DESIGN Experimental study. SETTING Academic medical center. SUBJECTS AND METHODS During 2008-2011, more than 200 toys marketed for children older than 6 months were screened for loudness. The toys with sound outp...
background: noise is one of the annoying agents in the environment and it is harmful agent in workplaces that its occurrence with work load, there are in many workstations. the aim of this study was to determine the combined effects of exposure to noise and work load on heart rate changes. methods: this cross-sectional study performed on 14 male students into climatic chamber in 2011.the mean ±...
Introduction: In the most industrial environment, workers are exposed to noise everyday. Exposure to this physical hazardous agent can cause immediate as well as delayed adverse effects. Cognitive performance decrement is one of the adverse effects of noise exposure which its main consequences is occupational accidents. This study attempted examine the effect of exposure to different levels of ...
Groups of human subjects were exposed for 8 or 24 h to an octave-band noise centered at 63, 125, or 250 Hz. For a 24-h exposure at 84 dBA, temporary threshold shifts (TTS) increased for 8-12 h and then either decreased or remained constant. Although TTS was less than 20 dB, complete recovery for many of the subjects required as long as 48 h. Accordingly, the higher level exposure which was plan...
INTRODUCTION Although quarry operations have high economic significance, the effects they cause to the workers in terms of excessive noise production cannot be overlooked. This cross-sectional study assessed the extent of noise exposure and its influence on hearing capabilities among quarry workers in Ashanti region. METHODS The study involved 400 workers randomly selected from five quarries ...
Limited therapeutic options are available for hepatic malignancies. Image guided targeted therapies have established their role in management of primary and secondary hepatic malignancies. Radioembolization with yttrium-90 ((90)Y) microspheres is safe and efficacious for treatment of hepatic malignancies. The tumoricidal effect of radioembolization is predominantly due to radioactivity and not ...
abstract poor reading comprehension can result in failure in using references, benefiting from professional gatherings and resources, keeping up with the growing body of knowledge in the virtual world of the internet, and failing to achieve in efl programs. the purpose of the present quasi-experimental study was to explore the effects of background knowledge and previewing narrative and expos...
The outdoor noise levels from the various work places of the integrated steel plant were measured. The average noise level (L(eqst)) at the outdoor was found between 59-84 dBA. The combined noise level (L(eq)) of the plant was 90 dBA and 92 dBA on 1.12.2006 and 1612.2006, respectively. The noise levels in the far fields were found between 43-70 dBA for daytime and meet the noise quality for ind...
a large number of single research studies on the effects of strategy-based instruction (sbi) in teaching english as a foreign or second language has been conducted so far. however, the lack of a comprehensive meta-analysis targeting the effectiveness of english language sbi is observed. moreover, the findings of experimental studies regarding the context of the english language, proficiency lev...
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