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Αποτελέσματα 18744-18763 από 19702

    • U.S. unconventional monetary policy and risk tolerance in major currency markets 

      Fassas A.P., Kenourgios D., Papadamou S. (2021)
      This paper studies the effects of U.S. unconventional monetary policy announcements on the implied volatility of three major currency pairs, Dollar/Euro, Dollar/British Pound and Dollar/Yen by using panel data analysis ...

    • UAV-Supported Route Planning for UGVs in Semi-Deterministic Agricultural Environments 

      Katikaridis D., Moysiadis V., Tsolakis N., Busato P., Kateris D., Pearson S., Sørensen C.G., Bochtis D. (2022)
      Automated agricultural operations must be planned and organized to reduce risk and failure potential while optimizing productivity and efficiency. However, the diversity of natural outdoor environments and the varied data ...

    • The ubiquitin-proteasome system in glioma cell cycle control 

      Vlachostergios, P. J.; Voutsadakis, I. A.; Papandreou, C. N. (2012)
      A major determinant of cell fate is regulation of cell cycle. Tight regulation of this process is lost during the course of development and progression of various tumors. The ubiquitin-proteasome system (UPS) constitutes ...

    • Udder surgery in ewes 

      Tsioli V., Fthenakis G.C. (2019)
      Objective of this review is to present relevant information about udder surgery in ewes and to discuss its applications within the frame of sheep health management. The indications, diagnostic procedures, techniques, ...

    • UGT1A1 promoter polymorphism as a predisposing factor of hyperbilirubinaemia in neonates with acute pyelonephritis 

      Fretzayas, A.; Kitsiou, S.; Tsezou, A.; Alexaki, A.; Nicolaidou, P. (2006)
      We describe 4 jaundiced neonates with acute pyelonephritis of whom family history was positive for or pointed to Gilbert's syndrome (GS). Uridine diphosphate glucuronosyltransferase 1A1 (UGT-1A1), ( TA) 7 polymorphism, ...

    • Ultimate bending capacity and buckling of pressurized 90 deg steel elbows 

      Karamanos, S. A.; Tsouvalas, D.; Gresnigt, A. M. (2006)
      The paper examines the nonlinear elastic-plastic response of internally pressurized 90 deg pipe elbows under in-plane and out-of-plane bending. Nonlinear shell elements from a general-purpose finite element program are ...

    • Ultimate bending capacity of spiral-welded steel tubes - Part I: Experiments 

      Van Es S.H.J., Gresnigt A.M., Vasilikis D., Karamanos S.A. (2016)
      The present investigation refers to the bending capacity of spiral-welded steel tubes. The first part of this investigation presents the results of a full-scale experimental program, aiming to investigate the structural ...

    • Ultimate bending capacity of spiral-welded steel tubes - Part II: Predictions 

      Vasilikis D., Karamanos S.A., Van Es S.H.J., Gresnigt A.M. (2016)
      In the second part of this investigation, numerical simulations are conducted using nonlinear finite element simulations, to define the bending strength and deformation capacity of large-diameter spiral-welded steel tubes. ...

    • Ultimate capacity of pipe bends under bending and pressure 

      Pappa, P.; Karamanos, S. A.; Tsouvalas, D.; Houliara, S. (2008)
      The structural capacity of pressurized pipe elbows under in-plane bending is examined. The investigation is conducted through advanced finite element analysis tools. The numerical results are successfully compared with ...

    • Ultimate capacity of pressurized 90 DEG elbows under bending 

      Karamanos, S. A.; Tsouvalas, D.; Gresnigt, A. M. (2004)
      In this paper the response of internally pressurized pipe elbows under bending loads (in-plane and out-of-plane) is examined. The investigation is conducted through advanced finite element analysis tools, supported by ...

    • Ultimate capacity of welded-slip joints under axial compression 

      Tsetseni, S.; Karamanos, S. A. (2006)
      Using advanced numerical tools, which account for the cold-expansion manufacturing process, the axial capacity of welded slip pipeline joints under compressive loading is investigated. The numerical results are in good ...

    • Ultimate compressive strength of CHS members with flattened edges 

      Mistakidis, E. S. (2003)
      The paper studies circular hollow members which have been submitted to a procedure for the formation of a flattened edge. Two different ways of formation of flattened edges are investigated, one involving a single-step ...

    • The ultimate limits of wireless networks 

      Antón-Haro, C.; Eldar, Y.; Galluccio, L.; Iosifidis, G.; Kountouris, M.; Koutsopoulos, I.; Matamoros, J.; Palazzo, S.; Shamai, S.; Belleville, M.; Ramakrishnan, V.; Masera, G.; Morche, D. (2012)
      This paper discusses the grand challenges associated with the holy grail of understanding and reaching the ultimate performance limits of wireless networks. Specifically, the next goal in the networking community is to ...

    • Ultra low-cycle fatigue performance of S420 and S700 steel welded tubular X-joints 

      Chatziioannou K., Karamanos S.A., Huang Y. (2019)
      The present study is motivated by the need for improving the fatigue performance of offshore wind energy structural systems. In particular, the ultra low-cycle fatigue performance of welded tubular X-joints is examined, ...

    • Ultra Low-Voltage Current Squaring and Multiplier 

      Vlassis S., Souliotis G., Plessas F. (2019)
      This paper presents the designs of analog CMOS current squaring circuit and four-quadrant multiplier which are capable for operation under ultra-low supply voltage. The design approach is based on CMOS devices operated in ...

    • Ultra wideband, low-power, 3-5.6 GHz, CMOS voltage-controlled oscillator 

      Tsitouras, A.; Plessas, F. (2009)
      In this paper, a low-power inductorless ultra wideband (UWB) CMOS voltage-controlled oscillator is designed in TSMC 0.18 mu m CMOS technology as a part of a ultra wideband FM (UWBFM) transmitter. The VCO includes a ...

    • Ultra-early planting effects on maize crop development, yield, and weed control 

      Chachalis, D.; Lolas, P. C.; Zanakis, G. (2006)
      Field experiments were conducted in 2001 and 2002 at the University of Thessaly Research Farm in Velestino, using three planting dates, namely: ultra-early (U-E, March 1 or 2), early (E), and normal (N) that were at least ...

    • Ultra-real or symbolic visualization? the case of the city through time 

      Sidiropoulos, G.; Vasilakos, A. (2006)
      The distinctive character of digital technology has created new conditions of approach and processing. The city as the object of visualization has its own peculiarities as a separate object, notwithstanding the demands ...

    • Ultra-Wideband, Low-Power, Inductorless, 3.1-4.8 GHz, CMOS VCO 

      Tsitouras, A.; Plessas, F. (2011)
      A low-power, inductorless, UWB CMOS voltage controlled oscillator is designed in 0.18 mu m CMOS technology targeting to a UWBFM transmitter application. The VCO is a Double-Cross-Coupled Multivibrator and generates output ...

    • Ultrasonic evaluation of intact, healing and osteoporotic long bones 

      Potsika V.T., Protopappas V.C., Grivas K.N., Gortsas T.V., Vavva M.G., Malizos K.N., Polyzos D.K., Fotiadis D.I. (2016)
      Quantitative ultrasound (QUS) has been introduced in recent years for the comprehensive noninvasive and non-ionizing evaluation of bone. This paper presents a review of our research work of the last decade including ...