Fibrations of genus two on complex surfaces

We consider fibrations of genus 2 over complex surfaces. The purpose of this paper is primarily to provide a geometric description of the possible structures of the fibration on a neighborhood of a singular fiber. In particular it is shown that the "geometric data" of the singular fiber determines the fibration on its neighborhood up to a transversely holomorphic $C^{\infty}$-diffeomorphism. The method employed is quite flexible and it applies to good extent to fibrations of arbitrary genus.Comment: This is the final version, June 201

Impact of a Tutored Theoretical-Practical Training to Develop Undergraduate Students’ Skills for the Detection of Caries Lesions: Study Protocol for a Multicenter Controlled Randomized Study

Background: Tutored laboratorial activities could be a manner of improving the competency development of students. However, its impact over conventional theoretical classes has not yet been tested. Additionally, different university contexts could influence this issue and should be explored. Objective: To assess the impact of a tutored theoretical-practical training for teaching undergraduate students to detect caries lesions as compared with theoretical teaching activities. The impact of these teaching/learning activities will be assessed in terms of efficacy, cost/benefit, retention of knowledge/acquired competences, and student acceptability. Methods: Sixteen centers (7 centers from Brazil and 9 centers from other countries throughout the world) are involved in the inclusion of subjects for this protocol. A randomized controlled study with parallel groups will be conducted. One group (control) will be exposed to a 60- to 90-minute conventional theoretical class and the other group (test) will be exposed to the same theoretical class and also a 90-minute laboratory class, including exercises and discussions based on the evaluation of a pool of images and extracted teeth. The mentioned outcomes will be evaluated immediately after the teaching activities and also in medium- and long-term analyses. To compare the long-term outcomes, students who enrolled in the university before the participating students will be interviewed for data collection and these data will be used as a control and compared with the trained group. This stage will be a nonrandomized phase of this study, nested in the main study. Appropriate statistical analysis will be performed according to the aims of this study. Variables related to the centers will also be analyzed and used to model adjustment as possible sources of variability among results. Results: This ongoing study is funded by a Brazilian national funding agency (CNPq- 400736/2014-4). We expect that the tutored theoretical-practical training will improve the undergraduate students’ performance in the detection of caries lesions and subsequent treatment decisions, mainly in terms of long-term retention of knowledge. Our hypothesis is that tutored theoretical-practical training is a more cost-effective option for teaching undergraduate students to detect caries lesions. Conclusions: If our hypothesis is confirmed, the use of laboratory training in conjunction with theoretical classes could be used as an educational strategy in Cariology to improve the development of undergraduate students’ skills in the detection of caries lesions and clinical decision-making

Towards good practice guidelines for the contour method of residual stress measurement

Accurate measurement of residual stress in metallic components using the contour method relies on the achievement of a good quality cut, on the appropriate measurement of the deformed cut surface and on the robust analysis of the measured data. There is currently no published standard or code of practice for the contour method. As a first step towards such a standard, this study draws on research investigations addressing the three main steps in the method: how best to cut the specimens; how to measure the deformation contour of the cut surface; and how to analyse the data. Good practice guidance is provided throughout the text accompanied by more detailed observations and advice tabulated in Appendi

Mapping the complex metastable fragmentation pathways of excited 3-aminophenol+

This work applies the technique of mapping ion detection using a reflectron mass spectrometer against flight-time and reflection voltage to elucidate the complex metastable fragmentation pattern of the biomolecular ion 3-aminophenol+ (3-AP+, C6H7NO+). Multiphoton ionization experiments revealed the excited ion's fragmentation routes for the first time and comparisons with calculated flight-times enabled 18 μs-timescale dissociations to be assigned. These included the rare observation of a double hydrogen loss channel from a fragment ion. Ab initio calculations provided further insights into the most prominent apparent fragmentation sequence: 3-AP+ (m/z 109) → HCO + C5H6N+ (m/z 80) → CNH + C4H5+ (m/z 53) → C2H2 + C2H3+ (m/z 27)

Assessment Of Myocardial Motion In Gated-spect Using A Multiresolution Technique

The assessment of the left ventricular (LV) motion in gated SPECT images is routinely used to identify myocardial ischemia. The precise evaluation of LV motion changes remains a largely qualitative process due to difficulties in quantifying endocardial border position and regional wall motion. In a previous work we described a method to estimate motion in image sequences based on the computation of the Optical Flow (OF). A common basic problem in estimating OF concerns how to compute derivative approximations from discrete data. The intrinsic Ill-posedesness of numerical differentiation can be transformed into a well-posed problem by using filters in the form of scaled convolution operators. Using this approach, the computing of OF can be improved and the information obtained used to measure other physical quantities in a sequence of images. In this work we propose and apply to a set of volunteers the measurement of the kinetic energy index, based on OF estimation.303306Jaszczak, R.J., Coleman, R.E., Single photon emission computed tomography (SPECT): Principles and instrumentation (1985) Invest Radiol, 20, pp. 897-910Blokland, J.A.K., Reiber, J.H.C., Pauwels, E.K.J., Quantitative analysis in single photon emission tomography (SPET) (1992) Eur J Nucl Med, 19, pp. 47-61Garcia, E.V., Van Train, K., Maddahi, J., Quantification of rotational thallium-201 myocardial tomography (1985) J Nucl Med, 26, pp. 17-26Van Train, K., Berman, D.S., Garcia, E., Quantitative analysis of stress TI-201 myocardial scintigrams: A multicenter trial validation utilizing standard normal limits (1986) J Nucl Med, pp. 2717-2725Garcia, E.V., Ezquera, N.F., DePuey, E.G., Na artificial intelligence approach to interpreting thallium-201 3-dimensional myocardial distribution (1986) J Nucl Med, 27, p. 1005Faber, T.L., Cooke, C.D., Peifer, J.W., Three-dimensional displays of the left ventricular epicardial surface from standard cardiac SPECT perfusion quantification techniques (1995) J Nucl Med, 36, pp. 697-703Sacha, J.P., Cios, K.J., Goodenday, L.S., Issues in automating cardiac SPECT diagnosis: Dealing with the computational complexity involved in knowledge discovery when working with images (2000) IEEE Eng Med Bio, 19, pp. 78-88Gutierrez, M.A., Estimation of myocardial kinetic energy in gated SPECT images (1995) Computers in Cardiology, 22, pp. 201-204Fenema, C., Thompson, W., Velocity determination in scenes containing several moving objects (1979) Computer Vision Graphics and Image Processing, 9, pp. 301-315Horn, B.K.P., Schunck, B.G., Determining optical flow (1981) Artificial Intelligence, 17, pp. 185-203Lindeberg, T., Discrete derivation approximations with scale-space properties: A basics for low-level feature extractions (1993) Journal of Mathematical Imaging and Visison, 3, pp. 349-37

Business cycles in a small open economy

Available from British Library Document Supply Centre- DSC:3597.9512(CEPR-DP--996) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Distribution costs and real exchange rate dynamics during exchange rate-based stabilization

Issued under the auspices of the Centre's research programme in International Macroeconomics: Also available via the InternetSIGLEAvailable from British Library Document Supply Centre-DSC:3597.9512(no 2944) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Cotula sericea resolved as the correct name for the mysterious C. fallax (Asteraceae: Anthemidae), with new synonyms and the new combination cotula discolor

Cotula sericea L.f. was based on an unlocalised collection from the southwestern Cape of a species with conspicuously petiolate, palmately bipinnatisect leaves and long, leafless scapes with discoid capitula subtended by glabrous, uninerved involucral bracts. It has, however, been historically misapplied to plants from the southern and southeastern South African coast with the leaves extending onto the base of the apically inflated peduncle and with shortly radiate capitula and ovate, ±. trinerved bracts. The nomenclatural and taxonomic history of the species is clarified and a lectoype is designated. True C. sericea is a high altitude, local endemic restricted to a few mountains in the Cold Bokkeveld of Western Cape, and we provide a full description and illustration based on wild-collected material. We conclude that it is an older name for the mysterious Cotula fallax D.J.N.Hind, recently described from cultivated material of unknown but possibly South African origin, and which we accordingly place in synonomy. The name Cenia discolor DC. is available for the heterogamous coastal taxon and we make the new combination Cotula discolor (DC.) J.C. Manning & Mucina for it in Cotula. Finally, we conclude that the poorly known Cotula mariae Bremer & Humphries from Cape Recief, Port Elizabeth, is an extreme maritime form of Cotula discolor and reduce it to synonomy