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Guo, J. (author), Bui, H.V. (author), Valdesueiro Gonzalez, D. (author), Yuan, Shaojun (author), Liang, Bin (author), van Ommen, J.R. (author)This work investigated the suppression of photocatalytic activity of titanium dioxide (TiO2) pigment powders by extremely thin aluminum oxide (Al2O3) films deposited via an atomic-layer-deposition-type process using trimethylaluminum (TMA) and H2O as precursors. The deposition was performed on multiple grams of TiO2 powder at room temperature...journal article 2018
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Chaves Jimenez, A. (author), Guo, J. (author), Gill, E.K.A. (author)In this work the extent to which orbit and attitude sensors may cross-support each other in a joint processing to reduce estimation errors of the relative orbital and attitude dynamics is investigated. In order to do this, an engineering dynamic model taking into account the coupling effects between orbit and attitude dynamics is exploited...journal article 2018
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Zhu, L. (author), Guo, J. (author), Gill, E.K.A. (author)In recent years, the increasing need in small satellite solutions triggers the miniaturization of attitude control systems. Reaction spheres were proposed as promising replacements of conventional reaction wheels for their 4π rotations. Since the generated control torques could be about any desired axes, a single reaction sphere is sufficient...journal article 2018
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- Shan, M. (author), Guo, J. (author), Gill, E.K.A. (author) journal article 2018
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Guo, J. (author), Yuan, Shaojun (author), Yu, Yangyang (author), van Ommen, J.R. (author), Van Bui, Hao (author), Liang, Bin (author)This work presents a novel chemical vapor deposition (CVD) approach that enables the deposition of ultrathin and conformal SiO<sub>2</sub> layers on TiO<sub>2</sub> anatase nanoparticles at room temperature using SiCl<sub>4</sub> and air containing water without the use of a catalyst. The morphology of the CVD-grown SiO<sub>2</sub> layers was...journal article 2017
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Guo, J. (author), Norte, R.A. (author), Groeblacher, S. (author)Mechanical oscillators are at the heart of many sensor applications. Recently several groups have developed oscillators that are probed optically, fabricated from high-stress silicon nitride films. They exhibit outstanding force sensitivities of a few aN/Hz1/2 and can also be made highly reflective, for efficient detection. The optical read-out...journal article 2017
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Speretta, S. (author), Pérez Soriano, T. (author), Bouwmeester, J. (author), Carvajal Godínez, J. (author), Menicucci, A. (author), Watts, T.G. (author), Sundaramoorthy, P.P. (author), Guo, J. (author), Gill, E.K.A. (author)<b>In the last two decades, CubeSats have changed the perception of satellite missions aided by standardization and usage of commercial-off-the-shelf components. CubeSats have also proven the feasibility of low cost and short development time space missions. The PocketQube with a form factor of 5x5x5 cm has been...conference paper 2016
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- Guo, J (author), Bouwman, W.A.G.A. (author) journal article 2016
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Chu, J. (author), Guo, J. (author), Gill, E.K.A. (author)This paper presents closed-form solutions for the problem of long-term satellite relative motion in the presence of J2 perturbations, and introduces a design methodology for long-term passive distance-bounded relative motion. There are two key ingredients of closed-form solutions.One is the model of relative motion; the other is the Hamiltonian...journal article 2015
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- Carvajal Godínez, J. (author), Haghayegh, M (author), Granados, A (author), Viru, J. (author), Guo, J. (author) other 2015
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- Guo, J. (author), Matthysen, A. (author), Fijneman, M. (author) conference paper 2014
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- Hashemifarahani, H. (author), Ditmar, P.G. (author), Inacio, P.M.G. (author), Klees, R. (author), Guo, J. (author), Guo, X. (author), Liu, X. (author), Zhao, Q. (author), Didova, O. (author), Ran, J. (author), Sun, Y. (author), Tangdamrongsub, N. (author), Gunter, B.C. (author), Riva, R.E.M. (author), Steele-Dunne, S.C. (author) conference paper 2014
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Hashemi Farahani, H. (author), Ditmar, P.G. (author), Klees, R. (author), De Teixeira da Encarnacao, J.G. (author), Liu, X. (author), Zhao, Q. (author), Guo, J. (author)The ability of satellite gravimetry data to validate global static models of the Earth’s gravity field is studied. Two types of data are considered: K-band ranging (KBR) data from the Gravity Recovery and Climate Experiment (GRACE) mission and Satellite Gravity Gradiometry (SGG) data from the GOCE (Gravity field and steady-state Ocean...journal article 2013
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Guo, J. (author), Nikou, S. (author), Bouwman, W.A.G.A. (author)The increasing number of smart phones presents a significant opportunity for the development of m-payment services. Despite the predicted success of m-payment, the market remains immature in most countries. This can be explained by the lack of agreement on standards and business models for all stakeholders in m-payment ecosystem. In this paper,...conference paper 2013
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Sun, R. (author), O'Keefe, K. (author), Guo, J. (author), Gill, E. (author)This paper proposes a precise and fast direction of arrival estimation method using Global Navigation Satellite System (GNSS) carrier phase measurements. Single-epoch, single-satellite integer cycle ambiguities are reliably resolved by making use of constraints and taking advantages of antenna arrays. The algorithm shows good robustness in cases...journal article 2013
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Cervone, A. (author), Zandbergen, B. (author), Bouwmester, J. (author), Guo, J. (author)The Space Systems Engineering department at the Faculty of Aerospace Engineering is hard at work miniaturizing satellite subsystems to accommodate the growing use of small satellites. One of the challenges the department has taken on is research into micro-propulsion. The limitations that come with small satellites make research in this !eld...journal article 2013
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Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author), Maessen, D.C. (author)Precision formation flying missions require formation acquisition and maintenance through the interactions among spacecraft by the inter-satellite communication and relative navigation. This paper analyses the dedicated system constraints of the network architecture for precision formation flying missions. The critical time issue and the...journal article 2012
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van der Wegen, M. (author), Guo, J. (author), Jaffe, B.E. (author), van der Spek, A.J.F. (author), Roelvink, J.A. (author)Levees are small elevation ridges found on the edge between channels and shoals. They are known to develop along river channels during floods and along channels in alluvial deep water fans. Levees in tidal environments such as the Waddenzee are less pronounced (with a typical height in the order of 10 cm) and may be recognized by the fact that...conference paper 2012
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Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author), Maessen, D. (author)Precise formation flying (PFF) missions require formation acquisition and maintenance through interactions among spacecraft by inter-satellite communication and relative navigation. That requires the network architecture to satisfy dedicated system constraints of time-criticality for updating navigation measurements and flexibility for...conference paper 2011
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Guo, J. (author), Yao, W. (author), Gill, E. (author)The design of Distributed Space Systems (DSSs) is a challenging task, especially in the conceptual design stage where unknown or uncertain information extensively exist. This paper investigates the problem of designing DSSs in the presence of uncertainties. The uncertainties associated with DSSs are discussed. It is shown that DSSs are...conference paper 2010