• Vertical axis wind turbines - are we any better informed?

      Robotham, AJ (New Zealand Wind Energy Association, 2014)
      In the early years of the modern era of the wind turbine, experimental development of vertical axis wind turbines (VAWTs) was underpinned by an incremental improvement of aerodynamic performance prediction methods; the ...
    • Vibration analysis of a variable length blade wind turbine

      Tartibu, LK; Kilfoil, M; Van Der Merwe, AJ (IJAET, 2012)
      In this paper, flap-wise, edge-wise and torsional natural frequencies of a variable length blade have been identified. Therefore designers can ensure that natural frequencies will not be close to the frequency of the main ...
    • Vibration of lightweight composite structures with random irregularities

      Chung, H (University of Otago, 2009)
      Exact determination of the vibration of a composite structure becomes impossible beyond the low-frequency range due to uncertainties in the structure. Therefore, the prediction model in the mid- to high-frequency range ...
    • Vibration of lightweight rib-reinforced structures with random irregularities

      Chung, H; Fox, C (Institutes of Acoustics, Chinese Academy of Sciences and Acoustical Society of China, 2008)
      This paper describes mathematical modelling procedure of the rib-reinforced floor/ceiling structures, which are made up of components with irregular shapes and physical parameters. Exact determination of the vibration of ...
    • Vibration reduction in lightweight floor/ceiling systems with a sand-sawdust damping layer

      Chung, H; Emms, G (The Australian Acoustical Society, 2014)
      This paper shows how to use a mathematical model to predict the vibration of lightweight timber-framed floor/ceiling systems (LTFSs) caused by mechanical excitation. The LTFS considered here is made up of an upper floor ...
    • Vibration transmission in a double-leaf plate with random rigidities and junctions

      Chung, H (The Australian Acoustical Society, 2013)
      Predicting vibrations of composite structures such as double-leaf plates is difficult because of the large number of components. In the low and high frequency ranges, the components may be homogenized, so that a structure ...
    • Virtual Engineering at NWVEC

      Robotham, AJ (Virtual Engineering Centre, the University of Liverpool, 2012)
      Hi-fidelity models require lengthy preparation Superfluous model data impedes the real-time experience Interaction requires intuitive and unobtrusive controls Immersion requires high refresh rates and accurate tracking ...
    • Virtual Engineering: case study with Bentley Motors

      Robotham, A (The University of Liverpool, 2011)
      Designing is more than just creating a product...it is also about creating an emotional experience! This presentation provides an overview of the Virtual Engineering Centre and its work with Optis UK and Bentley Motors to ...
    • Virtual overhearing: an effective way to increase network coding opportunities in wireless ad-hoc networks

      Xie, LF; Chong, PHJ; Ho, IW-H; Chan, HCB (Elsevier, 2016)
      Overhearing is of great importance to wireless network coding in that it can be exploited to obtain the side information needed for packet decoding. Recently, a new technique called virtual overhearing (VOH) was proposed ...
    • Virtualization Technology: Cross-VM Side Channel Attacks Make it Vulnerable

      Litchfield, A; Shahzad, A (Australasian Conference on Information Systems (ACIS), 2015)
      Cloud computing provides an effective business model for the deployment of IT infrastructure, platform, and software services. Often, facilities are outsourced to cloud providers and this offers the service consumer ...
    • Vision tracking and voice-controlled foyer service robot

      Moir, TJ; Almanji, A; Chitty, C; Chang, J (Massey University, 2010)
      Machine –human interaction based on voice control and vision tracking features is one of world main focuses in the robotic industry. The integration of voice control and vision tracking features is expected to deliver its ...
    • Visual Feasts - photographic narratives of belonging

      Robertson, N (World Indigenous Peoples Conference on Education (WiPC:E), 2014)
      Can photography contribute to inter-generational knowledge transmission through images of food and sites of hunting and gathering? Can education of sites of significance, environmental resources and ecologies be enhanced ...
    • Visual Impact Assessment - There's more to it than meets the eye!

      Robotham, AJ; Quilleash, P (Mechanical Engineering Publications Ltd, 1992)
      The visual impact of a wind farm is one of the major causes of concern for all current U.K. wind farm projects. Often visual impact is the singlemost important issue on which a planning application is judged. A fair and ...
    • VLBI and GPS carrier phase time and frequency transfer

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T (National Institute of Information and Communications Technology (NICT), 2010)
      As one of the new frequency transfer technique to compare the next highly stable frequency standards, we proposed the geodetic VLBI technique. We evaluated the ability of VLBI frequency transfer by comparison with GPS ...
    • VLBI measurements for frequency transfer

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (National Institute of Information and Communications Technology (NICT), 2010)
      We carried out the intercomparison experiment between VLBI and GPS to show that VLBI can measure the correct time difference. We produced an artificial delay change by stretching the Coaxial Phase Shifter which was inserted ...
    • VLBI measurements for Frequency Transfer

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (National Institute of Information and Communications Technology (NICT), 2008)
      We compare the frequency transfer precision between VLBI and GPS carrier phase using IVS and IGS observation data in order to confirm the potential of VLBI time and frequency transfer. The results of the VLBI frequency ...
    • VLBI Measurements for Time and Frequency Transfer

      Takiguchi, H; Koyama, Y; Ichikawa, R; Ishii, A; Hobiger, T; Hosokawa, M (Japan Society of Applied Physics (JSAP), 2008)
      原子泉型周波数標準器及び光周波数標準器の開発が世界各国で進められているが,このような 高精度の周波数標準器を比較する新しい時刻比較技術の開発も必要である.宇宙測地技術のひ とつであるVLBI は,遥か彼方の天体から放射される電波を,複数のアンテナで受信し,その 到達時間の差(遅延時間)を精密に計測している.解析では,遅延時間を各種物理パラメータと, 局の位置,速度,大気遅延と共に,基準局に対する観測局のクロックオフセットを未知パラメ ...
    • VLBI measurements for time and frequency transfer (from the EFTF forum, 2008)

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (European Frequency and Time Forum, 2008)
      Modern cold-atom-based frequency standards have already archived the uncertainty of 10-15at a few days. Moreover cold-atom-based optical clocks have the potential to realize the uncertainty of from 10-16 to 10-17 level ...
    • VLBI Measurements for Time and Frequency Transfer (from the JGU meeting, 2008)

      Takiguchi, H; Koyama, Y; Ichikawa, R; Ishii, A; Hobiger, T; Hosokawa, M (Japan Geoscience Union, 2008)
      Modern cold-atom-based frequency standards have already archived the uncertainty of 10−15 at a few days. Moreover coldatom- based optical clocks have the potential to realize the uncertainty of from 10−16 to 10−17 level ...
    • VLBI measurements for time transfer between time and frequency laboratories

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T (American Geophysical Union, 2007)
      In the usual geodetic VLBI analysis, clock offsets and their rates of change at participating stations except for the reference station are estimated. The averaged formal error (1σ) of the clock offsets is typically about ...