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Jung, H.,Mulholland, G.W.,Pui, D.Y.H.,Kim, J.H. Pergamon Press ; Elsevier Science Ltd 2012 Journal of aerosol science Vol.51 No.-
The slip correction parameter measured by Kim et al. (2005) is re-evaluated with the newly issued current smallest standard reference material SRM<SUP>(</SUP>R) 1964 (PSL 60.39nm). The same experimental method utilizing the electrical mobility technique under low pressure condition is used. From the measured peak voltages at low pressures down to 8.63kPa (Kn=81), slip correction factor (C) is calculated, and then the slip correction parameter (A) is obtained by nonlinear curve fitting. The parameter A is 1.165+0.480exp(-1.001/Kn) with the asymptotic value of 1.645 for the free molecular regime, which corresponds to a diffuse reflection fraction of 0.873. The value of A is at most 0.1% different from the value reported by Kim et al. (2005)1.165+0.483exp(-0.997/Kn) and the uncertainty is reduced by about 0.5% to a value of about 1.5%.
Density measurement of size selected multiwalled carbon nanotubes by mobility-mass characterization
Kim, S.H.,Mulholland, G.W.,Zachariah, M.R. Pergamon Press ; Elsevier Science Ltd 2009 Carbon Vol.47 No.5
We employ a combination of gas phase particle mobility and mass methods to make the first absolute density measurement of gas phase grown carbon nanotubes (CNTs). The approach combines a tandem differential mobility analyzer and aerosol particle mass analyzer in series to achieve two steps of electrical mobility classifications of the CNTs and one of mass classification. In the first mobility classification step a stream of monodisperse catalytic particles was produced by pulsed laser ablation. These mobility-classified catalysts seeded the aerosol growth of CNTs, where were directly passed to a second electrical mobility classification step which allows classification of the diameter-controlled CNTs in length. These diameter- and length-classified CNTs were finally introduced into the aerosol particle mass analyzer to measure their mass distribution. We found that the condensed phase density of CNTs was 1.74+/-0.16g/cm<SUP>3</SUP> for two different groups of CNTs with diameters of ∼15 and ∼22nm. This value is lower (about 3 sigma) than for graphite, and about 1 sigma lower than the average value for density measurements for carbon black.
Jung, H.,Han, K.,Mulholland, G.W.,Pui, D.Y.H.,Kim, J.H. Pergamon Press ; Elsevier Science Ltd 2013 Journal of aerosol science Vol.65 No.-
In this study, the slip correction factor is assessed from the measurements of the electrical mobilities of PSL, SiO<SUB>2</SUB> and Au nanoparticles under reduced pressure conditions. The asymptotic value (α+β) of the slip correction factor, which is generally used for evaluating the particle drag force, are obtained for three different particle materials, and the values are used to assess the momentum accommodation function. Our experimental results show that the gas molecular slip is strongly dependent on the particle material characteristics. The higher the surface energy of the particle materials (PSL: 0.06J/m<SUP>2</SUP>, SiO<SUB>2</SUB>: 0.30J/m<SUP>2</SUP>, and Au: 8.78J/m<SUP>2</SUP>), the more diffusive reflections observed in gas molecular collisions with nanoparticles (PSL: 87.3%, SiO<SUB>2</SUB>: 89.2%, and Au: 99.6%).
Haiming Liu,Dawei Song,Paul Mulholland 한국HCI학회 2016 한국HCI학회 학술대회 Vol.2016 No.1
To better understand users and create more personalised search experiences, a number of user models have been developed, usually based on different theories or empirical data study. After developing the user models, it is important to effectively utilise them in the design, development and evaluation of search systems to improve users’ overall search experiences. However there is a lack of research has been done on the utilisation of the user models especially theory-based models, because of the challenges on the utilization methodologies when applying the model to different search systems. This paper explores and states how to apply an Information Foraging Theory (IFT) based user classification model called ISE to effectively identify user’s search characteristics and create user groups, based on an empirically-driven methodology for content-based image retrieval (CBIR) systems and how the preferences of different user types inform the personalized design of the CBIR systems.
WSR 초기수트 조건에서의 입자 크기, 농도 및 화학적 특성
이의주(Eui Ju Lee),George. W. Mulholland 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The characteristics of soot near the soot inception point for an ethene-air flame was carried out in a WSR (well-stirred reactor). The new sampling tool like the temperature controlled filter system was introduced to minimize the condensation during sampling. The new analysis tools applied include the real time size distribution analysis with the Nano-DMA, particle size by transmission electron microscopy, C/H analysis, g filter analysis, and thermogravimetric analysis using both non-oxidative and oxidative pyrolysis. The WSR can generate young soot particles that can be collected and examined to gain insight into inception. For the current conditions, soot does not form for Φ=1.9, inception occurs at or before Φ=2.0, and inception combined with soot surface growth and/or coagulation occurs for Φ=2.1. The filter samples for Φ=1.9 are composed of volatile compounds that evolve at relatively low temperatures when heated in the presence or absence of O₂. The samples collected from the WSR at Φ=2.0 and Φ=2.1 are precursor-like in morphology and size. They have higher C/H ratios and lower organic percentages than precursor particles, but they are clearly not fully carbonized soot. The WSR PAH distribution is similar to that in young soot from inverse flames.
kai tobias block,Hersh Chandarana1,Sarah Milla,Mary Bruno,Tom Mulholland,Girish Fatterpekar,Mari Hagiwara,Robert Grimm,Christian Geppert,Berthold Kiefer 대한자기공명의과학회 2014 Investigative Magnetic Resonance Imaging Vol.18 No.2
Purpose : To describe how a robust implementation of a radial 3D gradient-echo sequence with stack-of-stars samplingcan be achieved, to review the imaging properties of radial acquisitions, and to share the experience from more than5000 clinical patient scans. Materials and Methods: A radial stack-of-stars sequence was implemented and installed on 9 clinical MR systems operatingat 1.5 and 3 Tesla. Protocols were designed for various applications in which motion artifacts frequently pose a problemwith conventional Cartesian techniques. Radial scans were added to routine examinations without selection of specificpatient cohorts. Results: Radial acquisitions show significantly lower sensitivity to motion and allow examinations during free breathing. Elimination of breath-holding reduces failure rates for non-compliant patients and enables imaging at higher resolution. Residual artifacts appear as streaks, which are easy to identify and rarely obscure diagnostic information. The improvedrobustness comes at the expense of longer scan durations, the requirement for fat suppression, and the nonexistence of atime-to-center value. Care needs to be taken during the configuration of receive coils. Conclusion: Routine clinical use of radial stack-of-stars sequences is feasible with current MR systems and may serve assubstitute for conventional fat-suppressed T1-weighted protocols in applications where motion is likely to degrade theimage quality