نتایج جستجو برای: perforated surface
تعداد نتایج: 642226 فیلتر نتایج به سال:
We report on the operation of a highly sensitive terahertz imaging system relying on a planar metallic plasmonic crystal as a terahertz surface plasmon resonant (THz-SPR) sensor. The terahertz imaging is based on the resonantly enhanced transmission phenomenon of a periodically perforated metal film. The detection sensitivity and the imaging contrast for small amounts of substance are considera...
Underwater ultrasonic transmissions for fluid-solid and air-solid phononic brass plates are reported in this work. Although the structure is roughly the same, experimental results show very different behaviour between fluid-solid and air-solid phononic plates, due to most of the properties of the fluid-solid perforated plates rely on Fabry-Perot resonances, Wood anomalies and Lamb modes. In air...
بررسی ریسک فاکتورهای آپاندیسیت پرفوره وغیر پرفوره در دو بیمارستان دانشگاهی بابل، سالهای 1382- 1380
Background: The early diagnosis of acute appendicitis before progression to gangrene or abscess formation is recognized as important to minimize morbidity from this common disease process. The aim of this study was to assess the value of different risk factors in the diagnosis of perforation. Methods: This descriptive-analytic and retrospective study was conducted to investigate epidemiologica...
Appendicitis is the most common abdominal emergency occurring in 7%-12% of the population. The aim of this article was to pictorially present the spectrum of appendix and acute appendicitis appearances on computed tomography (CT). The various appearances on CT of the normal appendix are shown as well as the CT criteria for the differentiation of perforated and non-perforated appendicitis.
We present an experimental and theoretical study of the optical transmission of a thin metal screen perforated by two subwavelength slits, separated by many optical wavelengths. The total intensity of the far-field double-slit pattern is shown to be reduced or enhanced as a function of the wavelength of the incident light beam. This modulation is attributed to an interference phenomenon at each...
A previously perforated planar TEM specimen of silicon sample (8GLJH-060) was ion milled for 10s using two argon guns at an angle of 20°, 0.5mA per gun and a fixed voltage of 4kV. The time the specimen surface was in contact with air was minimized to 3min, by taking it out of the ion mill and putting it in the electron microscope airlock immediately afterwards. The silicon wafer was left in the...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید