Searched for: subject:"locks"
(1 - 20 of 107)

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Hendrikse, H. (author), Seidel, Marc (author), Metrikine, A. (author), Loset, Sveinung (author)
Ice-induced vibrations have to be considered in design of vertically sided offshore structures subjected to loading by sea ice, such as offshore wind turbines and oil- and gas platforms. The interaction between ice and structure may result in high global peak loads and the occurring structural vibrations can contribute significantly to the...
conference paper 2017
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Shahmohammadi, M. (author)
doctoral thesis 2016
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Babaie, M. (author)
doctoral thesis 2016
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Zong, Z. (author), Babaie, M. (author), Staszewski, R.B. (author)
This paper proposes a mm-wave frequency generation technique that improves its phase noise (PN) performance and power efficiency. The main idea is that a fundamental 20 GHz signal and its sufficiently strong third harmonic at 60 GHz are generated simultaneously in a single oscillator. The desired 60 GHz local oscillator (LO) signal is delivered...
journal article 2016
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Asveld, L. (author)
The policies of the European Union concerning the development of biofuels can be termed a lock-in. Biofuels were initially hailed as a green, sustainability technology. However evidence to the contrary quickly emerged. The European Commission proposed to alter its policies to accommodate for these effects but met with fierce resistance from a...
journal article 2016
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Babaie, M. (author), Kuo, F.W. (author), Chen, H (author), Cho, L.C. (author), Jou, C.P. (author), Hsueh, F.L. (author), Shahmohammadi, M. (author), Staszewski, R.B. (author)
We propose a new transmitter architecture for ultra-low power radios in which the most energy-hungry RF circuits operate at a supply just above a threshold voltage of CMOS transistors. An all-digital PLL employs a digitally controlled oscillator with switching current sources to reduce supply voltage and power without sacrificing its startup...
journal article 2016
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Read, S.A. (author), Lindhult, Erik (author)
Transition of energy systems has been under-theorised. We have argued previously that energy efficiency as a strategy for fossil fuel replacement is inadequate as energy demand is not being reduced by efficiency alone. This paper is intended to elaborate further on the reasons. We require better answers to better questions about the nature of...
conference paper 2016
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Van Marrewijk, N. (author), Mirzaei, B. (author), Hayton, D. (author), Gao, J.R. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author)
We have performed frequency locking of a dual, forward reverse emitting third-order distributed feedback quantum cascade laser (QCL) at 3.5 THz. By using both directions of THz emission in combination with two gas cells and two power detectors, we can for the first time perform frequency stabilization, while monitor the frequency locking quality...
journal article 2015
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Bergen, J.P. (author)
Conceiving of nuclear energy as a social experiment gives rise to the question of what to do when the experiment is no longer responsible or desirable. To be able to appropriately respond to such a situation, the nuclear energy technology in question should be reversible, i.e. it must be possible to stop its further development and...
journal article 2015
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Ahmadi Mehr, S.A.R. (author), Tohidian, M. (author), Staszeski, R.B. (author)
In modern RF system on chips (SoCs), the digital content consumes up to 85% of the IC chip area. The recent push to integrate multiple RF-SoC cores is met with heavy resistance by the remaining RF/analog circuitry, which creates numerous strong aggressors and weak victims leading to RF performance degradation. A key such mechanism is injection...
journal article 2015
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Wu, W. (author), Staszewski, R.B. (author), Long, J.R. (author)
A mm-wave digital transmitter based on a 60 GHz all-digital phase-locked loop (ADPLL) with wideband frequency modulation (FM) for FMCW radar applications is proposed. The fractional-N ADPLL employs a high-resolution 60 GHz digitally controlled oscillator (DCO) and is capable of multi-rate two-point FM. It achieves a measured rms jitter of 590.2...
journal article 2014
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Zhuang, J. (author), Staszewski, R.B. (author)
This paper presents an all-digital phase-locked loop (ADPLL) architecture in a new light that allows it to significantly save power through complexity reduction of its phase locking and detection mechanisms. The natural predictive nature of the ADPLL to estimate next edge occurrence of the reference clock is exploited here to reduce the timing...
journal article 2014
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Wang, H.Z. (author), Zou, Z.J. (author)
In this paper, a numerical study on the behaviours of a ship passing through a lock under the influence of a berthed ship is carried out. The viscous flow and hydrodynamic forces are calculated by applying an unsteady RANS code with a RNG k-å turbulence model. UDF is compiled to define the ship motion. The numerical results are obtained and...
conference paper 2013
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Hayton, D.J. (author), Khudchenko, A. (author), Pavelyev, D.G. (author), Hovenier, J.N. (author), Baryshev, A. (author), Gao, J.R. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author), Vaks, V. (author)
We report on the phase locking of a 3.4 THz third-order distributed feedback quantum cascade laser (QCL) using a room temperature GaAs/AlAs superlattice diode as both a frequency multiplier and an internal harmonic mixer. A signal-to-noise level of 60?dB is observed in the intermediate frequency signal between the 18th harmonic of a 190.7?GHz...
journal article 2013
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Cantarelli, C.C. (author), Flyvbjerg, B. (author), Van Wee, G.P. (author), Molin, E.J.E. (author)
Een belangrijk fenomeen dat kostenoverschrijdingen kan verklaren is lock-in. We definiëren lockin als de buitenmatige verbondenheid van besluitmakers aan een inefficiënt besluit. Dit kan op twee manieren invloed hebben op de mate van kostenoverschrijdingen. Ten eerste methodologisch: kostenoverschrijdingen worden berekend op basis van de...
journal article 2012
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Kashmiri, S.M. (author)
In recent years, a lot of research has been devoted to the realization of accurate integrated frequency references. A thermal-diffusivity-based (TD) frequency reference provides an alternative method of on-chip frequency generation in standard CMOS technology. A frequency-locked loop locks the output frequency of an oscillator to the accurate...
doctoral thesis 2012
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Ren, Y. (author), Hovenier, J.N. (author), Cui, M. (author), Hayton, D.J. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Shi, S.C. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author)
We report frequency locking of two 3.5-THz third-order distributed feedback (DFB) quantum cascade lasers (QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. We show that the free-running linewidths of the QCLs are dependent on the electrical and temperature tuning coefficients....
journal article 2012
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Brolsma, J.U. (author), Roelse, K. (author)
The Waterway Guidelines cover only: • the transport engineering design; the structural design is beyond the scope of the Guidelines; • waterways in CEMT classes I to V and recreational waterways; • waterways without currents or with a longitudinal current up to 0.5 m/s; • waterways that are not primarily intended for sea shipping; • waterways...
report 2011
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Cantarelli, C.C. (author)
In the Netherlands, the costs of railroad infrastructure construction work out 11 per cent higher than forecast; the percentage for roads is 19 and 22 for bridges and tunnels. While this puts the Netherlands in a favourable light compared to other countries, the actual cost overruns are probably far higher, believes Chantal Cantarelli, who...
doctoral thesis 2011
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Gerard, M.P. (author)
Mobility and traffic safety is a major concern in the society today. Many accidents take place because the vehicle is not following the trajectory that the driver desires. To avoid such accidents, an increasing number of active safety systems are introduced in modern vehicles. Still, most of the time, those systems are designed independently,...
doctoral thesis 2011
Searched for: subject:"locks"
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