نتایج جستجو برای: parasitic elements
تعداد نتایج: 308919 فیلتر نتایج به سال:
sunflower (helinathus annuus) is a susceptible host to the holoparasite hemp broomrape (orobanche ramosa) in central parts of iran, causing yield loss due to severe infestations. a field study was conducted in 2006 to evaluate the efficacy of glyphosate for controlling the parasitic weed hemp broomrape in sunflower. glyphosate was applied once or twice at five rates ranging from 0.075 to 0.450 ...
in this study parasitic infection of bobwhite and japanese quails were clarified in farms of garmsar city in province of semnan. forty quails from two breeds randomly were selected and they examined to identify all internal and external parasites .finding was shown that five percent of the quails examined harbored one or more species of helminthes. two cestodes, raillietina echinobothrida and r...
This work examines the ability of a special type smart antenna array known as Switched Active Parasitic Antenna (SASPA) to produce directive and electronically steerable radiation pattern. The SASPA consists elements that are switchable between active parasitic states by using P-Intrinsic-N (PIN) diodes. element is supplied radio frequency while short-circuiting terminals an in results element....
A convex optimization formulation is provided for antenna arrays comprising reactively loaded parasitic elements. The objective function consists of maximizing the array gain, while constraints on admittance are in order to properly account reactive loads. Topologies with two and three electrically small dipole one fed element or elements, respectively, considered conditions obtaining supergain...
This paper presents two improved precision rectifiers, each employing two active elements and two MOS transistors. The new circuits are advantageous when compared to the most recent work [5] by enjoying high input impedance and resistor-less realization, which makes them ideal for CMOS implementation. High precision and wide frequency operation of the circuits is shown along with parasitic inse...
The remarkable diversity in the contents of genomes raises questions about how new genes and new functions originate. Recent evidence indicates that parasitism, particularly the molecular interactions between phage and their bacterial hosts, is a likely mechanism for generating new genes. This invention of such novel functions seems to be founded on a strategy that secures the short-term surviv...
This paper presents the theoretical investigation of a slotted patch antenna. The main objective of proposed work is to obtain a large bandwidth antenna with reduced size. The antenna has a compact size of 21.1mm x 20.25mm x 8.5mm. Two designs with minor variation are studied which provide wide impedance bandwidths of 24.056% and 25.63% respectively with the use of parasitic elements when excit...
Large-scale control and progressive elimination of a wide variety of parasitic diseases is moving to the fore. Indeed, there is good pace and broad political commitment. Yet, there are some worrying signs ahead, particularly the anticipated declines in funding and coverage of key interventions, and the paucity of novel tools and strategies. Further and intensified research and development is th...
A new mixed-mode second order quadrature oscillator using two differential voltage current conveyors as active elements, two grounded capacitors and two grounded resistors each is proposed. The circuit provides several current and voltage outputs simultaneously. The circuit has low active and passive sensitivities. Non-ideal and parasitic study of the proposed circuit is also included. PSPICE s...
This paper presents a distributed circuit model of the cold cathode fluorescent lamps (CCFLs) in the backlight units (BLUs) of liquid crystal displays (LCDs). This model consists of nonlinear resistors and parasitic circuit elements, and it can be used to simulate CCFL BLUs for various input waveforms using standard circuit simulators. The nonlinear resistors were modeled after the measured DC ...
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