نتایج جستجو برای: acoustic barriers
تعداد نتایج: 166440 فیلتر نتایج به سال:
The excessive production of new tires and the inappropriate disposal waste have caused serious environmental public health problems. To properly dispose this liability, these rubber residues been used in cement composites to improve some their properties hardened state. This study evaluates incorporation vermiculite concrete terms mechanical acoustic properties. Different compositions were defi...
Our research group has been investigating various aspects of graphics recognition techniques for more than ten years. We have worked on map analysis, symbol recognition, dimension analysis and the conversion of engineering drawings to CAD models. Lately, we are also conducting research on the interpretation of architectural drawings. In addition, we have built up a software platform of generic ...
nowadays, thousands tons of chemicals material are used to increase agricultural production that provides a risky situation for the communities. recently, biological or organic agriculture is considered to get rid of such problems. but this style of agriculture is facing with many difficulties and challenges. this study was performed in three phases by using delphi method. in this regard, the s...
background: internal barriers are an important group of barriers to blood glucose level control. finding the viewpoints of patients, their families and medical team on these barriers is an important step towards correct planning and effective control of blood glucose. this study aimed to find and compare viewpoints of patients, their families and medical team about internal barriers to control ...
this study aimed at identifying and analyzing contextual barriers of organizational entrepreneurship in the islamic republic of iran ministry of sport and youth. this study was applied in terms of goals, descriptive with regard to strategy. the method was survey conducted by mixed method (qualitative-quantitative). after reviewing the literature, experts had deep interviews by qualitative metho...
Using the recently discovered THermally induced Optical Reflection of Sound (THORS) phenomenon, it is possible to generate optically induced, local density barriers in air by absorption intense, modulated laser light (the THORS phenomenon), which results abrupt differences compressibility at these that can efficiently reflect incident acoustic waves. In this note, we demonstrate ability manipul...
1. Males of many bird species match song with neighbours during territorial interactions. Although bird vocal mimicry has received much attention, the relationships between song variation and ecological factors such as landscape geometry and habitat fragmentation are still poorly known, and most previous research has been limited to one or a few populations of a species. In this study we analys...
Objective Today transoral laser microsurgery is considered as one of the first options to control early laryngeal cancer, and voice disorder is one of the inevitable complications of this therapeutic component. This study aimed to compare the vocal function in patients with early-stage laryngeal cancer following laser surgery with healthy individuals with normal voice quality using acoustic ana...
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