2,818 research outputs found
[Review of the book Canada...notwithstanding: the making of the constitution 1976-1982 by R. Romanov, J. Whyte and H. Leeson]
No full textPT: J; CR: ROMANOW R, 1984, CANADA NOTWITHSTANDI; NR: 1; TC: 0; J9: CAN J POLIT SCI; PG: 2; GA: ALD87Source type: Electronic(1
De Ratione Status Nicolai Martini V. J. D. & Polit. P. P. Oratio In Illustri Christiano-Albertina Ante aliquot menses pro loco habita, nunc publici Juris facta
No full textDE RATIONE STATUS NICOLAI MARTINI V. J. D. & POLIT. P. P. ORATIO IN ILLUSTRI CHRISTIANO-ALBERTINA ANTE ALIQUOT MENSES PRO LOCO HABITA, NUNC PUBLICI JURIS FACTA
De Ratione Status Nicolai Martini V. J. D. & Polit. P. P. Oratio In Illustri Christiano-Albertina Ante aliquot menses pro loco habita, nunc publici Juris facta ( - )
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Magnifice Dn. Prorector, Perillustres ac Generosissimi Magnates, Excellentissimi Omnium Facultatum Dn. Professores, ... ( -
Der Parteiausschluss: Voraussetzungen, Verfahren u. gerichtl. Überprüfung d. Ausschlusses von Mitgliedern aus polit. Parteien
No full textRisse J. Der Parteiausschluss: Voraussetzungen, Verfahren u. gerichtl. Überprüfung d. Ausschlusses von Mitgliedern aus polit. Parteien. Schriften zum öffentlichen Recht ; 479. Berlin: Duncker u. Humblot; 1985
Two higher order Zig-Zag theories for the accurate analysis of bending, vibration and buckling response of laminated plates by radial basis functions collocation and a unified formulation
No full textIn this article, we combine the Carreras Unified Formulation, CUF (Carrera E. Theories and Finite elements for multilayered plates and shells: A unified compact formulation with numerical assessment and benchmarking. Arch. Comput. Methods Eng., 2003; 10: 215-297.) and a radial basis function collocation technique for predicting the static deformations, free vibrations and buckling behavior of thin and thick cross-ply laminated plates. We develop by the CUF two Zig-Zag theories according to Murakamis Zig-Zag function. Both theories account for through-the-thickness deformations, allowing the analysis of thick plates. The accuracy and efficiency of this collocation technique for static, vibration, and buckling problems are demonstrated through numerical examples. © 2011 The Author(s)
Interethnic differences in the accuracy of anthropometric indicators of obesity in screening for high risk of coronary heart disease.
No full textBACKGROUND: Cut points for defining obesity have been derived from mortality data among Whites from Europe and the United States and their accuracy to screen for high risk of coronary heart disease (CHD) in other ethnic groups has been questioned. OBJECTIVE: To compare the accuracy and to define ethnic and gender-specific optimal cut points for body mass index (BMI), waist circumference (WC) and waist-to-hip ratio (WHR) when they are used in screening for high risk of CHD in the Latin-American and the US populations. METHODS: We estimated the accuracy and optimal cut points for BMI, WC and WHR to screen for CHD risk in Latin Americans (n=18 976), non-Hispanic Whites (Whites; n=8956), non-Hispanic Blacks (Blacks; n=5205) and Hispanics (n=5803). High risk of CHD was defined as a 10-year risk > or =20% (Framingham equation). The area under the receiver operator characteristic curve (AUC) and the misclassification-cost term were used to assess accuracy and to identify optimal cut points. RESULTS: WHR had the highest AUC in all ethnic groups (from 0.75 to 0.82) and BMI had the lowest (from 0.50 to 0.59). Optimal cut point for BMI was similar across ethnic/gender groups (27 kg/m(2)). In women, cut points for WC (94 cm) and WHR (0.91) were consistent by ethnicity. In men, cut points for WC and WHR varied significantly with ethnicity: from 91 cm in Latin Americans to 102 cm in Whites, and from 0.94 in Latin Americans to 0.99 in Hispanics, respectively. CONCLUSION: WHR is the most accurate anthropometric indicator to screen for high risk of CHD, whereas BMI is almost uninformative. The same BMI cut point should be used in all men and women. Unique cut points for WC and WHR should be used in all women, but ethnic-specific cut points seem warranted among men
Thinking geographically: space, theory and contemporary human geography
No full textPT: J; CR: HUBBARD P, 2002, THINKING GEOGRAPHICA; NR: 1; TC: 0; J9: POLIT GEOGR; PG: 3; GA: 871ZHSource type: Electronic(1
Divi Norberti archiepiscopi Magdebvrgensis, Præmonstratensium fundatoris, vita /
No full textDedicatie: Joannes Brazius. Drempeldichten: Jean Polit, Lambertus Moraeus, Claudius BourguignonDe Theux, XavierMachiels, J. Catalogus van de boeken gedrukt vóór 1600 ; M 104Europeana-GoogleBook
Vibroacoustic Performance of Plane Plate with Random Stiffness
No full textTwo decades ago, big emphasis was given in the transportation industry when announcing new structural solutions able to solve a series of engineering problems; among them the noise and pollutant emissions have to be remembered, for example. The increased attention was paid to look for passive/active control solution able to extend the functionality of each given ‘standard’ design: one can define this approach as top-down. With the time passing, several steps were performed backward and specifically for the noise and vibration problems, the research programmes were directed to investigate the new possibilities offered by the emerging new materials and configurations: a classical bottom-up approach. The functionally graded materials and multifunctional materials are good examples of this new possibilities still to be deeply investigated. It has been recognized for some time that sandwich panels offer potential benefits for tailoring of transmission loss (TL). As early as 1959, Kurtze and Watters [1] studied the application of sandwich panels to increase the sound insulation between adjoining spaces. They investigated the relation between bending and shear waves and TL characteristics, and proposed laminated plates with a soft but incompressible core to increase the coincidence frequency by several octaves. Their results hence suggest how such a panel can be designed to approximate the mass law in levels over a wide frequency range. Lang and Dym [2] optimized the design of a sandwich panel with a goal to exceed the TL values predicted by the mass law by at least 20 dB in a selected frequency range. Starting from nine design variables (density, Young’s modulus, shear modulus, Poisson’s ratio and thickness of the core, and density, and the Young’s modulus, Poisson’s ratio and thickness of the skins), a number of assumptions and linked constraints reduced the design variables to just the density and thickness for the core and the skins. The results indicated two basic means for improving the TL of sandwich panels. The first is to use panels that follow mass law (more massive, less stiff) over a large frequency range. This solution has obvious drawbacks for weight-constrained and load-limiting applications. The second is to increase the core stiffness in order to increase the symmetric coincidence frequency, while maintaining the anti-symmetric coincidence at low frequencies. Barton [3] and Grosveld [4] considered an aeronautical application of honeycomb panels for improving sidewall attenuation in a light twin-engine aircraft, with respect to propeller tonal noise and its five main harmonic components. In the last decade other authors have analyzed the dynamic behaviour and the TL properties of sandwich panels [5-9]. Most of the research has focused on developing and testing new numerical tools for describing the dynamic behaviour of 2-D sandwich panels (i.e. transfer matrix approach, spectral finite elements). Thamburaj and Sun [9] demonstrate again that an anisotropic core can lead to higher TL and that the proper design of face sheet thickness can further improve the performance. Additional indication that structural acoustic optimization has the potential to achieve significant gains for reducing interior noise levels in aerospace structures may be found in the work of Cunefare et al. [10-11]. The results indicated that spatial variations of the design parameters would yield improved performance as compared to uniform properties. With the assumed disturbance, spatial orientation and directionality must be considered to reach an optimal design. A recent development in sandwich structures is the use of a core made of a lattice of truss elements. The layout of the core may be periodic or it can have a random topology. Manufacturing these panels by casting makes them a feasible option. There has been some NASA testing of the performance of these structures [12]. Casting the core provides the opportunity to readily implement various core configurations through proper design of the mould. The design freedom of a truss provides a great deal of latitude in the investigation of a truss core’s influence on the structural acoustic performance of panels that incorporate them. In a periodic structure, as sandwich one, the impedance mismatch generated by periodic discontinuities in the geometry and/or in the constituent material cause destructive wave interference phenomena over specific frequency bands called stop bands. The location and the extent of these band gaps depend on the nature of wave propagation [13]. Recent studies [14] have shown that the capability of classical periodic structures to attenuate the propagation of waves can be enhanced by using shunted piezoelectric materials ([15], [16]). Periodic arrays of shunted piezoelectric patches can be employed even for broad band vibrations attenuation in plate structures [17]. Shunted piezoelectric patches act as sources of impedance mismatch, which yield interference phenomena resulting from the interaction between incident, reflected and transmitted waves produced by the mismatch. The impedance mismatch corresponding to the shunted piezo-electrics can be tuned to achieve strong attenuation over frequency bands that are defined by the shunting circuit connected to the patches. Hence the activity to be presented here is the straight continuation of a previous work completely devoted to the optimisation of sandwich plates [18]. Here, the target is the same but it was studied how and what a random distribution of the stiffness can influence the target of vibroacoustic performances. Some of the present analysis can be classified in the studies concerning the master-fuzzy systems, [19-22]. The investigated models are based on standard Finite Element Approach: two simple plates connected trough point-to-point stiffnesses, two simple plate with an intermediate core. The Vibroacoustic target is the acoustic radiated power and the distribution of the natural frequencies. The final goal of the present work is the comparison between the optimised configuration, developed with a multi-objectives and multi-constraints framework [19], and configurations having a core with a random distribution of stiffness. These master-fuzzy systems can represent the first approximation of a structure with embed multifunctional or functionally graded materials randomly activated. References 1. Kurtze, G., and Watters, B. G., 1959, “New wall design for high transmission loss or high damping,” J. Acoust. Soc. Am. 31, pp. 739-748. 2. Lang, M. A., and Dym, C. L., 1975, “Optimal acoustic design of sandwich panels,” J. Acoust. Soc. Am. 57(6) Part II, pp. 1481-1487. 3. Barton, C. K., and Mixson, J. S., 1981, “Noise transmission and control for light twin-engine aircraft,” J. of Aircraft 18(7), pp. 570-575. 4. Grosveld, F. W., and Mixson, J. S., 1985, “Noise transmission though an acoustically treated and honeycomb-stiffened aircraft sidewall,” J. of Aircraft 22(5), pp. 434-440. 5. El-Raheb, M., 1997, “Frequency response of a two-dimensional truss-like periodic panel,” J. Acoust. Soc. Am. 101(6), pp. 3457-3465. 6. El-Raheb, M., and Wagner, P., 1997, “Transmission of sound across a truss-like periodic panel: 2-D analysis,” J. Acoust. Soc. Am. 102(4), pp. 2176-2183. 7. El-Raheb, M., and Wagner, P., 2002, “Effects of end cap and aspect ratio on transmission sound across a truss-like periodic double panel,” J. Sound Vib. 250(2), pp. 299-322. 8. Thamburaj, P., and Sun, Q., 2002, “Optimization of anisotropic sandwich beams for higher sound transmission loss” J. Sound Vib., 254(1), pp.23-36. 9. Ruzzene, M., 2004, “Vibration and sound radiation of sandwich beams with honeycomb truss cores,” J. Sound Vib., 277, pp.741-763. 10. Crane, S. P., Cunefare, K. A., Engelstad, S. P., and Powell, E. A., 1997, “A comparison of optimization formulations for design minimization of aircraft interior noise,” AIAA J. of Aircraft 34(2), pp. 236-243. 11. Cunefare, K. A., and Dater, B., 2003, “Structural acoustic optimization using the complex method,” J. of Computational Acoustics 11(1), pp. 115-137. 12. Engelstad, S. P., Cunefare, K. A., Powell, E. A., and Biesel, V., 2000, “Stiffener shape design to minimize interior noise,” AIAA Journal of Aircraft 37(1), pp. 165-171. 13. Krause, D. L., Whittenberger, J. D., Kantzos, P. T. and Hebsur, M. G., 2002, “Mechanical Testing of IN718 Lattice Block Structures,” Report NASA/TM--2002-211325. 14. Langley, R.S., 1996, “The response of two-dimensional periodic structures to point harmonic forcing.” Journal of Sound and Vibration, 197, pp.447-469. 15. Thorp, O., Ruzzene, M., and Baz, A., 2001, “Attenuation and localization of wave propagation in rods with periodic shunted piezoelectric patches.” Smart Materials and Structures, 10(5), pp.979-989. 16. Von Flotow, A., Hagood, N., 1991, “Damping of structural vibrations with piezoelectric materials and passive electrical networks. Journal of Sound and Vibration. 17. Lesieutre, A., 1998, “Vibration damping and control using shunted piezoelectric materials.” The Shock and Vibration Digest, 30. 18. Ruzzene, M. and Airoldi, L.., 2008, “Broad-band vibration attenuation in plates with periodic arrays of shunted piezoelectric patches.” Acoustical Society of America Journal. 19. Franco, F., Cunefare, K.A., Ruzzane, M., 2007, “Structural-Acoustic Optimization of Sandwich Panels.” ASME Journal of Vibration and Acoustics, Vol. 129, 330-340. 20. Pierce, A. D., Russell, D. and Sparrow, V. W., 1995, “Fundamental structural acoustic idealizations for structures with fuzzy internals.” ASME J. Vib. Acoust., 117 339–348. 21. Weaver, R. L., 1997, “Mean and mean-square responses of a prototypical master/fuzzy structure.” J. Acoust. Soc. Am. 101, No. 3, 1441–1449. 22. Strasberg, M. and Feit, D., 1996, “Vibration damping of large structures induced by attached small resonant structures,” J. Acoust. Soc. Am. 99(1), 335–344
Analysis of sandwich plates by Radial Basis Functions collocation, according to Murakami's Zig-Zag theory
No full textIn this article, the static analysis of sandwich plates is performed by radial basis functions collocation, according to the Murakami's Zig-Zag function theory. The Murakami's Zig-Zag function theory accounts for through-the-thickness deformation, by considering a Zig-Zag evolution of the transverse displacement with the thickness coordinate. The equations of motion and the boundary conditions are obtained by the Carrera's unified formulation, and further interpolated by collocation with radial basis functions. © The Author(s) 2012 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav
Service provision and barriers to care for homeless people with mental health problems across 14 European capital cities
No full textAbstract Background Mental health problems are disproportionately higher amongst homeless people. Many barriers exist for homeless people with mental health problems in accessing treatment yet little research has been done on service provision and quality of care for this group. The aim of this paper is to assess current service provision and identify barriers to care for homeless people with mental health problems in 14 European capital cities. Method Two methods of data collection were employed; (i) In two highly deprived areas in each of the 14 European capital cities, homeless-specific services providing mental health, social care or general health services were assessed. Data were obtained on service characteristics, staff and programmes provided. (ii) Semi-structured interviews were conducted in each area with experts in mental health care provision for homeless people in order to determine the barriers to care and ways to overcome them. Results Across the 14 capital cities, 111 homeless-specific services were assessed. Input from professionally qualified mental health staff was reported as low, as were levels of active outreach and case finding. Out-of-hours service provision appears inadequate and high levels of service exclusion criteria were evident. Prejudice in the services towards homeless people, a lack of co-ordination amongst services, and the difficulties homeless people face in obtaining health insurance were identified as major barriers to service provision. Conclusions While there is variability in service provision across European capital cities, the reported barriers to service accessibility are common. Homeless-specific services are more responsive to the initial needs of homeless people with mental health problems, while generic services tend to be more conducive to long term care. Further research is needed to determine the effectiveness of different service delivery models, including the most effective coordination of homeless specific and generic services.</p
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