A novel geometry of a slotted fractal antenna is presented in this paper for the multi-band appli... more A novel geometry of a slotted fractal antenna is presented in this paper for the multi-band applications in X-band as well as Ku-band. The proposed antenna is designed for three commonly used substrates—FR4, RT Duroid and Teflon. The performance in terms of reflection coefficient, impedance bandwidth, radiation pattern and peak gain is analyzed for all the three substrates in high-frequency structure simulator (HFSS). The gain of the proposed multi-band fractal antenna is observed to be quite high keeping in view the small size of the antenna. The proposed antenna using FR4 substrate is also fabricated whose reflection coefficient characteristics and gain are found to be in agreement with the simulated results. The comparison of the proposed antenna with the earlier reported fractal antennas operating in X-band and Ku-band is also done in terms of many parameters to prove the significance of the proposed antenna.
Investigative ophthalmology & visual science, May 1, 2017
To test whether quantitative functional tests and optical coherence tomography (OCT)-defined stru... more To test whether quantitative functional tests and optical coherence tomography (OCT)-defined structure can serve as effective tools to diagnose and monitor early diabetic neuroretinal disease. Fifty-seven subjects with diabetes (23 without diabetic retinopathy [no DR], 19 with mild nonproliferative diabetic retinopathy [mild NPDR], 15 with moderate to severe [moderate NPDR]), and 18 controls underwent full ophthalmic examination, fundus photography, spectral-domain optical coherence tomography (SD-OCT), e-ETDRS (Early Treatment Diabetic Retinopathy Study) acuity, and the quick contrast sensitivity function (qCSF) method. Perimetry testing included short-wavelength automated perimetry (SWAP), standard automated perimetry (SAP), frequency doubling perimetry (FDP), and rarebit perimetry (RBP). ETDRS acuity and RBP were not sensitive for functional differences among subjects with diabetes. AULCSF, a metric of qCSF, was reduced in diabetics with moderate compared to mild NPDR (P = 0.03),...
Food impaction in the esophagus is a relatively common medical emergency. Most of these food impa... more Food impaction in the esophagus is a relatively common medical emergency. Most of these food impactions are relieved spontaneously. But for complete esophageal food impactions or impactions not relieved spontaneously, traditional endoscopic methods like using a Roth net, polypectomy snare, or rat or alligator tooth forceps are used to gently manipulate the food material into the stomach. However, these methods may not work in certain circumstances. We present a case of proximal esophageal food impaction that was relieved using an inflatable balloon after the conventional methods proved unsuccessful.
A novel geometry of a slotted fractal antenna is presented in this paper for the multi-band appli... more A novel geometry of a slotted fractal antenna is presented in this paper for the multi-band applications in X-band as well as Ku-band. The proposed antenna is designed for three commonly used substrates—FR4, RT Duroid and Teflon. The performance in terms of reflection coefficient, impedance bandwidth, radiation pattern and peak gain is analyzed for all the three substrates in high-frequency structure simulator (HFSS). The gain of the proposed multi-band fractal antenna is observed to be quite high keeping in view the small size of the antenna. The proposed antenna using FR4 substrate is also fabricated whose reflection coefficient characteristics and gain are found to be in agreement with the simulated results. The comparison of the proposed antenna with the earlier reported fractal antennas operating in X-band and Ku-band is also done in terms of many parameters to prove the significance of the proposed antenna.
Investigative ophthalmology & visual science, May 1, 2017
To test whether quantitative functional tests and optical coherence tomography (OCT)-defined stru... more To test whether quantitative functional tests and optical coherence tomography (OCT)-defined structure can serve as effective tools to diagnose and monitor early diabetic neuroretinal disease. Fifty-seven subjects with diabetes (23 without diabetic retinopathy [no DR], 19 with mild nonproliferative diabetic retinopathy [mild NPDR], 15 with moderate to severe [moderate NPDR]), and 18 controls underwent full ophthalmic examination, fundus photography, spectral-domain optical coherence tomography (SD-OCT), e-ETDRS (Early Treatment Diabetic Retinopathy Study) acuity, and the quick contrast sensitivity function (qCSF) method. Perimetry testing included short-wavelength automated perimetry (SWAP), standard automated perimetry (SAP), frequency doubling perimetry (FDP), and rarebit perimetry (RBP). ETDRS acuity and RBP were not sensitive for functional differences among subjects with diabetes. AULCSF, a metric of qCSF, was reduced in diabetics with moderate compared to mild NPDR (P = 0.03),...
Food impaction in the esophagus is a relatively common medical emergency. Most of these food impa... more Food impaction in the esophagus is a relatively common medical emergency. Most of these food impactions are relieved spontaneously. But for complete esophageal food impactions or impactions not relieved spontaneously, traditional endoscopic methods like using a Roth net, polypectomy snare, or rat or alligator tooth forceps are used to gently manipulate the food material into the stomach. However, these methods may not work in certain circumstances. We present a case of proximal esophageal food impaction that was relieved using an inflatable balloon after the conventional methods proved unsuccessful.
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