6 research outputs found
IEEE 802.15.3a Standard Uyumlu, Ultra Geniş Bantlı- Düşük Gürültülü Kuvvetlendirici Devresinin Gerçeklenmesi
Özet: Bu çalışmanın amacı IEEE 802.15.3a standardı ile uyumlu, yüksek performanslı, düşük maliyetli,geniş bantlı, düşük gürültülü kuvvetlendirici (LNA) tasarlamaktır. Devre, Cadence ve ADS tasarım / simülasyon /modelleme ortamları kullanılarak, 0.35μm SiGe BiCMOS HBT teknolojisi ile tasarlanmıştır. LNA devresi optimize edildikten sonra, üretime gönderilmiştir. 3.1 -5 GHz bandında gürültü değeri 3-4 dB arasında ölçülmüş olup, maksimum güç kazancı 15 dB olarak ölçülmüştür
Program FFlexCom — High frequency flexible bendable electronics for wireless communication systems
Today, electronics are implemented on rigid substrates. However, many objects in daily-life are not rigid — they are bendable, stretchable and even foldable. Examples are paper, tapes, our body, our skin and textiles. Until today there is a big gap between electronics and bendable daily-life items. Concerning this matter, the DFG Priority Program FFlexCom aims at paving the way for a novel research area: Wireless communication systems fully integrated on an ultra-thin, bendable and flexible piece of plastic or paper. The Program encompasses 13 projects led by 25 professors. By flexibility we refer to mechanical flexibility, which can come in flavors of bendability, foldability and, stretchability. In the last years the speed of flexible devices has massively been improved. However, to enable functional flexible systems and operation frequencies up to the sub-GHz range, the speed of flexible devices must still be increased by several orders of magnitude requiring novel system and circuit architectures, component concepts, technologies and materials
IEEE 802.15.3a Standard Uyumlu, Ultra Geniş Bantlı- Düşük Gürültülü Kuvvetlendirici Devresinin Gerçeklenmesi
Özet: Bu çalışmanın amacı IEEE 802.15.3a standardı ile uyumlu, yüksek performanslı, düşük maliyetli,geniş bantlı, düşük gürültülü kuvvetlendirici (LNA) tasarlamaktır. Devre, Cadence ve ADS tasarım / simülasyon /modelleme ortamları kullanılarak, 0.35μm SiGe BiCMOS HBT teknolojisi ile tasarlanmıştır. LNA devresi optimize edildikten sonra, üretime gönderilmiştir. 3.1 -5 GHz bandında gürültü değeri 3-4 dB arasında ölçülmüş olup, maksimum güç kazancı 15 dB olarak ölçülmüştür
The effect of adenotonsillectomy on right ventricle function and pulmonary artery pressure in children with adenotonsillar hypertrophy
Objectives: Adenotonsillar hypertrophy (ATH) is the most common cause of upper airway obstruction in children. Severe upper airway obstruction may have an effect on chronic alveolar hypoventilation, which consequently may lead to right ventricle (RV) dysfunction induced by hypoxemic pulmonary vasoconstriction. The investigators aimed to study RV function and mean pulmonary artery pressure (mPAP) in patients with ATH who were undergoing adenotonsillectomy by using tissue Doppler echocardiography (TDE)
alpha-Amylase and alpha-glucosidase inhibitory activities of the extracts and constituents of Ferulago blancheana, F. pachyloba and F. trachycarpa roots
Eleven coumarins named osthole (1), imperatorin (2), bergapten (3),
prants-chimgin (4), grandivitinol (5), suberosin (6), xanthotoxin (7),
felamidin (8), marmesin (9), umbelliferone (10), ulopterol (11), and a
sterol mixture consisted of stigmasterol (12), beta-sitosterol (13) were
isolated from the roots of Ferulago blancheana, F. pachyloba and F.
trachycarpa through in vitro bioassay-guided fractionation processes.
The extracts and bioactive compounds were evaluated for their
alpha-amylase and alpha-glucosidase activities. Among the tested
compounds, felamidin and suberosin showed significant alpha-glucosidase
inhibitory activity with IC50 values of 0.4 and 0.9 mg/mL, respectively,
when compared to the reference standard acarbose (IC50 = 4.9 mg/mL).
Grandivitinol (IC50 = 20.0 mg/mL) had the lowest inhibitory effect. On
the other hand, none of the tested extracts were found to be active on
alpha-amylase inhibition. This is the first report on isolation,
characterization of the bioactive compounds and evaluation the
alpha-amylase and alpha-glucosidase inhibitory activities of these
species