نتایج جستجو برای: helical antenna
تعداد نتایج: 68840 فیلتر نتایج به سال:
Terahertz (THz) band antennas are becoming a more attractive field of research due to the wide range applications and advantages in future communications. A design helical antenna for ultra-high-speed THz wireless over short-range communication is proposed. The proposed provides ultra-wideband bandwidth, high directional gain, low-cost, circular polarization features. shows interesting results ...
in this paper, a novel directional super wide band micro strip antenna based on a simple and new geometry has been proposed. the antenna exhibits the widest bandwidth ever reported to the authors’ knowledge from 50 ghz to 200 ghz. its radiation pattern is approximately steady in the frequency ranges of 50 ghz to 200 ghz. the antenna consists of a club-like radiating patch, a combination of thre...
Hardened steels are commonly used in wide areas of technologies and industries. In respect of poor machinability of these steels and requirement of expensive cutting tools, study of machining economy is a matter of importance. Thus the present study deals with the economic considerations of various hole making processes. For this purpose, the hard steel samples were machined by conventional dri...
Introduction: Auricular reconstruction of partial ear defects is usually challenging, especially in extended resections or traumas. Helical rim is the most noticeable part of ear with aesthetic significance, which demands detailed procedures. Helical rim advancement is a known procedure to reshape lacerated rim. In the original technique, a chondrocutaneous flap is raised in order to preserve t...
چکیده ندارد.
Hardened steels are commonly used in wide areas of technologies and industries. In respect of poor machinability of these steels and requirement of expensive cutting tools, study of machining economy is a matter of importance. Thus the present study deals with the economic considerations of various hole making processes. For this purpose, the hard steel samples were machined by conventional dri...
Inside living cells, many essential processes involve deformations of charged helical molecules and the interactions between them. Actin filaments and DNA molecules are important examples of charged helical molecules. In this paper, we consider an impermeable double stranded charged molecule in the solvent. According to the nature, the dielectric constant of the molecule is considerably differe...
this research uses computational modeling to explore another method to increase diesel engine performance while maintaining low pollutant emission levels. previous studies have shown that injection-rate profiles and injector configurations play important roles on the performance and emissions of particulate and nox in di diesel engines. since the most important engine design parameters, includi...
background: in helical tomotherapy (ht), the scaling factor (sf) is the time in seconds that each leaf viewing a target would need to be open to deliver the prescribed dose. the sf is patient-specific and is used to calculate the rotational period of the gantry, and the total treatment time (ttt) of the ht. the sf is generally difficult to estimate. currently, it takes about one hour to fully o...
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