Discovery of a strange tribaryon S⁰(3115) in ⁴He(stopped ^K−,p) reaction

Suzuki, T.,Bhang, H.,Franklin, G.,Gomikawa, K.,Hayano, R.S.,Hayashi, T.,Ishikawa, K.,Ishimoto, S.,Itahashi, K.,Iwasaki, M.,Katayama, T.,Kondo, Y.,Matsuda, Y.,Nakamura, T.,Okada, S.,Outa, H.,Quinn, B. Elsevier 2004 Physics letters: B Vol.597 No.3

<P><B>Abstract</B></P><P>We have measured the proton energy distribution from the <SUP>4</SUP>He(stopped <SUP>K−</SUP>,p) reaction by means of time-of-flight. A mono-energetic peak was observed, which is interpreted as the formation of a new kind of neutral tribaryon S<SUP>0</SUP>(3115) with isospin T=1 and strangeness S=−1. The mass and width of the state were deduced to be 3117.0−4.4+1.5MeV/<SUP>c2</SUP> and <21MeV/<SUP>c2</SUP>, respectively. The state mainly decays into ΣNN.</P>

The effect of small embankments on wind speeds

Quinn, A.D.,Robertson, A.P.,Hoxey, R.P.,Short, J.L.,Burgess, L.R.,Smith, B.W. Techno-Press 1998 Wind and Structures, An International Journal (WAS Vol.1 No.4

Full-scale measurements have been made to determine the increase in wind speed over two exposed embankments, one of $23^{\circ}$ slope and 4.7 m in height, the other of $24^{\circ}$ slope and 7.3 m in height. Measurements were made at heights of 5, 10 and 15 m above the upper edge of each embankment and at the same heights approximately 100 m upwind in the lower-level approach fetch. Despite the modest sizes of the embankments, the maximum recorded increase in mean wind speed was 28% and the minimum was 13%; these increase relate to increases in wind loads on structures erected at the top of the embankments of 64% and 28% respectively. The associated increases in gust speeds are estimated at 33% and 18%, which imply increases in gust loading of 77% and 39% respectively. These experimental results are compared with predictions obtained from a computational fluid dynamics (CFD) analysis, using three high Reynolds number eddy-viscosity models and estimates from the UK wind loading code, BS 6399: Part 2. The CFD results are generally in agreement with the experimental data, although near-ground effects on the embankment crest are poorly reproduced.

Modelling the dispersion of a tracer gas in the wake of an isolated low-rise building

Quinn, A.D.,Wilson, M.,Reynolds, A.M.,Couling, S.B.,Hoxey, R.P. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.1

Mean concentrations of ammonia gas released as a tracer from an isolated low-rise building have been measured and predicted. Predictions were calculated using computational fluid dynamics (CFD) and two dispersion models: a diffusion model and a Lagrangian particle tracking technique. Explicit account was taken of the natural variation of wind direction by a technique based on the weighted summation of individual steady state wind direction results according to the probability density function of the wind direction. The results indicated that at distances >3 building heights downstream the weighted predictions from either model are satisfactory but that in the near wake the diffusion model is less successful. Weighted solutions give significantly improved predictions over unweighted results. Lack of plume spread is identified as the main cause of inaccuracies in predictions and this is linked to inadequate resolution of flow features and mixing in the CFD model. Further work on non-steady state simulation of wake flows for dispersion studies is recommended.

CFD modelling of free-flight and auto-rotation of plate type debris

B. Kakimpa,D.M. Hargreaves,J.S. Owen,P. Martinez-Vazquez,C.J. Baker,M. Sterling,A.D. Quinn 한국풍공학회 2010 Wind and Structures, An International Journal (WAS Vol.13 No.2

This paper describes the use of coupled Computational Fluid Dynamics (CFD) and Rigid Body Dynamics (RBD) in modelling the aerodynamic behaviour of wind-borne plate type objects. Unsteady 2D and 3D Reynolds Averaged Navier-Stokes (RANS) CFD models are used to simulate the unsteady and non-uniform flow field surrounding static, forced rotating, auto-rotating and free-flying plates. The auto-rotation phenomenon itself is strongly influenced by vortex shedding, and the realisable k-epsilon turbulence modelling approach is used, with a second order implicit time advancement scheme and equal or higher order advection schemes for the flow variables. Sequentially coupling the CFD code with a RBD solver allows a more detailed modelling of the Fluid-Structure Interaction (FSI) behaviour of the plate and how this influences plate motion. The results are compared against wind tunnel experiments on auto-rotating plates and an existing 3D analytical model.

CFD modelling of free-flight and auto-rotation of plate type debris

Kakimpa, B.,Hargreaves, D.M.,Owen, J.S.,Martinez-Vazquez, P.,Baker, C.J.,Sterling, M.,Quinn, A.D. Techno-Press 2010 Wind and Structures, An International Journal (WAS Vol.13 No.2

This paper describes the use of coupled Computational Fluid Dynamics (CFD) and Rigid Body Dynamics (RBD) in modelling the aerodynamic behaviour of wind-borne plate type objects. Unsteady 2D and 3D Reynolds Averaged Navier-Stokes (RANS) CFD models are used to simulate the unsteady and non-uniform flow field surrounding static, forced rotating, auto-rotating and free-flying plates. The auto-rotation phenomenon itself is strongly influenced by vortex shedding, and the realisable k-epsilon turbulence modelling approach is used, with a second order implicit time advancement scheme and equal or higher order advection schemes for the flow variables. Sequentially coupling the CFD code with a RBD solver allows a more detailed modelling of the Fluid-Structure Interaction (FSI) behaviour of the plate and how this influences plate motion. The results are compared against wind tunnel experiments on auto-rotating plates and an existing 3D analytical model.

Pressure field of a rotating square plate with application to windborne debris

Martinez-Vazquez, P.,Kakimpa, B.,Sterling, M.,Baker, C.J.,Quinn, A.D.,Richards, P.J.,Owen, J.S. Techno-Press 2012 Wind and Structures, An International Journal (WAS Vol.15 No.6

Traditionally, a quasi steady response concerning the aerodynamic force and moment coefficients acting on a flat plate while 'flying' through the air has been assumed. Such an assumption has enabled the flight paths of windborne debris to be predicted and an indication of its potential damage to be inferred. In order to investigate this assumption in detail, a series of physical and numerical simulations relating to flat plates subject to autorotation has been undertaken. The physical experiments have been carried out using a novel pressure acquisition technique which provides a description of the pressure distribution on a square plate which was allowed to auto-rotate at different speeds by modifying the velocity of the incoming flow. The current work has for the first time, enabled characteristic pressure signals on the surface of an auto-rotating flat plate to be attributed to vortex shedding.

Pressure field of a rotating square plate with application to windborne debris

P. Martinez-Vazquez,B. Kakimpa,M. Sterling,C.J. Baker,A.D. Quinn,P.J. Richards,J.S. Owen 한국풍공학회 2012 Wind and Structures, An International Journal (WAS Vol.15 No.6

Traditionally, a quasi steady response concerning the aerodynamic force and moment coefficients acting on a flat plate while ‘flying’ through the air has been assumed. Such an assumption has enabled the flight paths of windborne debris to be predicted and an indication of its potential damage to be inferred. In order to investigate this assumption in detail, a series of physical and numerical simulations relating to flat plates subject to autorotation has been undertaken. The physical experiments have been carried out using a novel pressure acquisition technique which provides a description of the pressure distribution on a square plate which was allowed to auto-rotate at different speeds by modifying the velocity of the incoming flow. The current work has for the first time, enabled characteristic pressure signals on the surface of an auto-rotating flat plate to be attributed to vortex shedding.

Scaling of Ion Spectral Peaks in the Hybrid RPA-TNSA Region

K. F. Kakolee,M. Borghesi,M. Zepf,S. Kar,D. Doria,B. Ramakrishna,K. Quinn,G. Sarri,J. Osterholz,M. Cerchez,O. Willi,X. Yuan,P. McKenna 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.6

The role of the radiation pressure of an intense laser beam in the formation of proton and carbon spectra from thin foils is discussed. The data presented suggests that, in competition with the Target Normal Sheath Acceleration mechanism, the onset of the Light Sail (LS) region of Radiation Pressure Acceleration can be obtained for suitably thin targets at currently available laser intensities,. The spectral features and their scaling with the laser and target parameters are consistent with the scenario of Light Sail (LS) acceleration.

Low-voltage, high speed inkjet-printed flexible complementary polymer electronic circuits

Baeg, K.J.,Jung, S.W.,Khim, D.,Kim, J.,Kim, D.Y.,Koo, J.B.,Quinn, J.R.,Facchetti, A.,You, I.K.,Noh, Y.Y. Elsevier Science 2013 ORGANIC ELECTRONICS Vol.14 No.5

We report the development of high-performance inkjet-printed organic field-effect transistors (OFETs) and complementary circuits using high-k polymer dielectric blends comprising poly(vinylidenefluoride-trifluoroethylene) (P(VDF-TrFE)) and poly(methyl methacrylate) (PMMA) for high-speed and low-voltage operation. Inkjet-printed p-type polymer semiconductors containing alkyl-substituted thienylenevinylene (TV) and dodecylthiophene (PC12TV12T) and n-type P(NDI2OD-T2) OFETs showed high field-effect mobilities of 0.1-0.4cm<SUP>2</SUP>V<SUP>-1</SUP>s<SUP>-1</SUP> and low threshold voltages down to 5V. These OFET properties were modified by changing the blend ratio of P(VDF-TrFE) and PMMA. The optimum blend - a 7:3wt% mixture of P(VDF-TrFE) and PMMA - was successfully used to realize high-performance complementary inverters and ring oscillators (ROs). The complementary ROs operated at a supplied bias (V<SUB>DD</SUB>) of 5V and showed an oscillation frequency (f<SUB>osc</SUB>) as high as ~80kHz at V<SUB>DD</SUB>=30V. Furthermore, the f<SUB>osc</SUB> of the complementary ROs was significantly affected by a variety of fundamental parameters such as the electron and hole mobilities, channel width and length, capacitance of the gate dielectrics, V<SUB>DD</SUB>, and the overlap capacitance in the circuit configuration.

Endometrial cancer risk and survival by tumor MMR status

Christina M. Nagle,Christina M. Nagle,Tracy A. O'Mara,Yen Tan,Daniel D. Buchanan,Andreas Obermair,Penny Blomfield,Michael A. Quinn,Penelope M. Webb,Amanda B. Spurdle,Australian Endometrial Cancer Stud 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.3

Objective: The risk of developing endometrial cancer (EC) and/or survival following a diagnosis of EC might differ by tumor DNA mismatch repair (MMR) status. We assessed the association between tumor MMR status (classified as MMR-proficient, somatic MMR-deficient, germline MMR-deficient) and the risk of developing EC and survival following a diagnosis of EC. Methods: We analyzed data from women who participated in the Australian National Endometrial Cancer Study (ANECS) conducted between 2005 and 2007. Risk analyses (698 cases/691 population controls) utilized sociodemographic and lifestyle information obtained from telephone interviews at recruitment. For survival analyses (728 cases), patients' clinical data was abstracted from medical records, and survival data were obtained via linkage with the Australian National Death Index. We used logistic regression analysis to evaluate the associations between tumor MMR status and EC risk, and proportional hazards models to perform survival analyses with adjustment of known prognostic factors. Results: Established risk factors for EC did not differ significantly by tumor MMR status. In analyses including all EC subtypes, overall and EC-specific survival did not differ by tumor MMR status. Among women with the most common endometrioid subtype, EC-specific survival was worse for women with somatic MMR-deficient EC compared to women with MMR-proficient EC (hazard ratio [HR]=2.18; 95% confidence interval [CI]=1.19–4.01). Conclusion: The risk of EC is not associated with MMR status. Accurate separation of germline from somatic causes of MMR deficiency suggests that patients with endometrioid subtype somatic MMR-deficient tumors have poorer EC-specific survival than those with MMR-proficient tumors, after accounting for other prognostic factors.