نتایج جستجو برای: acoustic barriers
تعداد نتایج: 166440 فیلتر نتایج به سال:
Porous materials have good acoustic damping characteristics over a wide frequency range. As for sound waves, many small-scale pores in the coating materials can convert underwater-coating to rough surfaces. The main property of porous absorbents is their resistance against incident sound wave that leads to damping effect. From a physical point of view, damping occurs due to friction between flu...
Abstract There are several international standards that define the way to evaluate attenuation capacity of noise reducing devices, by single-number quantities representing airborne sound insulation and insertion loss. These two single-value ratings quality performance acoustic barriers, former being related intrinsic latter both extrinsic characteristics devices. However, not many studies can b...
AbstractGene therapy is a therapeutic approach to deliver genetic material into cells to alter their function in entire organism. One promising form of gene delivery system (DDS) is liposomes. The success of liposome-mediated gene delivery is a multifactorial issue and well-designed liposomal systems might lead to optimized gene transfection particularly in vivo. Liposomal gene delivery systems...
AbstractGene therapy is a therapeutic approach to deliver genetic material into cells to alter their function in entire organism. One promising form of gene delivery system (DDS) is liposomes. The success of liposome-mediated gene delivery is a multifactorial issue and well-designed liposomal systems might lead to optimized gene transfection particularly in vivo. Liposomal gene delivery systems...
background although in many countries child abuse reporting is mandated, iranian nurses report abused cases voluntary. some of the cases are reported to the police and others are referred to welfare organizations or other non-governmental organizations. absence of a uniform reporting system along with a lack of legal support in the specific cultural context of iran has resulted challenges for t...
Ultrasound induced microbubble cavitation can cause enhanced permeability across natural barriers of tumors such as vessel walls or cellular membranes, allowing for enhanced therapeutic delivery into the target tissues. While enhanced delivery of small (<1nm) molecules has been shown at acoustic pressures below 1MPa both in vitro and in vivo, the delivery efficiency of larger (>100nm) therapeut...
Propagation of dust ion acoustic waves in plasmas composed of nonthermal distributed electrons and stationary dust particles is investigated. Nonlinear Schrdinger equation is derived to describe small amplitude waves, using the reduction perturbation technique. Modulation instability of dust ion acoustic waves is analysed for this system. Parametric investigation indicates that growth rate of...
The upper part of the Krka River estuary and Prokljan Lake are a specific example well-stratified estuarine environment in submerged river canyon. Here, we reconstructed geomorphological evolution area classified data gathered study, integrating multibeam echosounder data, backscatter side-scan sonar morpho-bathymetric surveys, acoustic sub-bottom profiling, with addition ground-truthing sedime...
abstract background: kangaroo mother care (kmc) is the most implementation intervention in caring of the infants, as in this method, both the mothers and infants are cared. the world health organization recommends implementation of kmc for all infants. however, there are some barriers in the way of its application. the purpose of this study was evaluation of the practical application of kmc and...
results of the 120 distributed questionnaires, 94 questionnaires were completed and returned (78.3%). about 56.6% of participants used the internet to answer the questions about their patients. there was a significant relationship between patient-related barriers and manager-related barriers (r = 0.237, p = 0.023). post hoc tests showed that there is a significant difference between the attitud...
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