475 research outputs found
Manual Hydraulic Structures
No full textThis manual is the result of group work and origins in Dutch lecture notes that have been used since long time. Amongst the employees of the Hydraulic Engineering Department that contributed to this work are dr.ir. S. van Baars, ir.K.G.Bezuijen, ir.G.P.Bourguignon, prof.ir.A.Glerum, dr.ir.P.A.Kolkman, ir. H.K.T. Kuijper, ir. H.G. Voortman and prof.drs.ir. J.K. Vrijling. The latest years, this manual has been clarified, revised and expanded by ir. W.F. Molenaar and ing. M.Z. Voorendt. We have received much feedback from students and got good input from our student-assistants, which is highly appreciated and has been taken taken into account for this new edition. In the 2016 edition, some minor corrections were made throughout the Manual, most noticeably the equation for the spring stiffness of a combined system in Section 29.2. Section 11.1 has been updated with more generic weir discharge equations. Furthermore, serviceability requirements have been added to the chapter on wave-overtopping (Chapter 17) and the Blum theory for laterally loaded piles has been better explained in Chapter 44. The largest change is the addition of Chapter 49, about the determination of the height of flood defences
Author Correction:A 41,500 year-old decorated ivory pendant from Stajnia Cave (Poland)
No full textCorrection to: Scientific Reports https://doi.org/10.1038/s41598-021-01221-6, published online 25 November 2021The original version of this Article contained errors in the author list where Marjolein D. Bosch was omitted from the author list, and Mikołaj Urbanowski was incorrectly listed as an author of the original Article, and has subsequently been removed.The Author contributions section now reads:“S.T. W.N. and A.N. conceived the project; S.T., W.N., A.P., M.B., S.C., M.D., H.F., A.M., M.D. B., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H., performed research; S.T., A.P., W.N., M.B., M.D.B., S.C., M.D., H.F., A.M., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H. analysed all archaeological data; S.T. and A.P. wrote the paper with the collaboration of all the co-authors.”The original Article and its accompanying Supplementary Information file have been corrected
Effects of nonuniform surface heat flux and uniform volumetric heating on blanket design for fusion reactors
Get PDFAn analytical solution for the temperature profile and film temperature drop for fully-developed, laminar flow in a circular tube is provided. The surface heat flux varies circcimferentally but is constant along the axis of the tube. The volulmetric heat generation is uniform in the fluid. The fully developed laminar velocity profile is approximated by a power velocity profile to represent the flattening effect of a perpendicular magnetic field when the coolant is electrivally conductive. The presence of volumetric heat generation in the fluid adds another component to the film temperature drop to that due to the surface heat flux. The reduction of the boundary layer thickness by a perpendicular magnetic field reduces both of these two film temperature drops. A strong perpendicular magnetic field can reduce the film termperatiure drop by a factor of two if the fluid is electrically conducting. The effect of perpendicualr magnetic field )or the flatness of the velocity profile) is less pronounced on teh film termperature drop due to nonuniform surfacae heat flux than on that due to uniform surface heat flux. An example is provided to show the relative effects on these two film temper
User's manual for FENAT: a two-dimensional multigroup diffusion theory Finite Element Neutral Atom Transport code
No full textFENAT solves the two-dimensional energy dependent diffusion equation in Cartesian (X-Y) and cylindrical/toroidal (R-Z) coordinates. The boundary conditions allowed are: vacuum, reflection, albedo and surface source. The energy variable is treated by multigroup method. The resulting multigroup diffusion equation is solved by finite element Galerkin's method with triangular element discretization of the spatial domain. The algebraic matrix equation is solved by the direct method of Crout variation of Gauss' elimination. Dynamic memory allocation has been used so that the maximum problem size is limited by the size of active core storage of the machine. When necessary, the global matrix is stored in a binary disk file. FENAT is particularly suitable for the transport of neutral atoms in fusion plasmas
Jamaica Bay: Flood Risk Reduction System
No full textHurricane Sandy made landfall in Atlantic City, New Jersey, United States (U.S.) October 29, 2012 as a post-tropical cyclone. With a wind field of approximately 1000 mi (1600 km) and a near 90 degree landfall angle with the coast, the storm generated an 11.6 ft (3.52 m) storm tide above mean sea level (MSL) at the Battery, New York City, and resulted in more than 1 billion to $2 billion (2014 dollars). Because the barrier is still in the early design phases, the final costs of the system will differ from this estimate.Hydraulic Structures and Flood RiskHydraulic EngineeringCivil Engineering and Geoscience
Low cost and efficient energy storage concepts for power plants using pulsed fusion reactors
No full textThe development of the Dutch Flood safety strategy
No full textThis technical report sketches the main development of the flood defence system in the Netherlands. It concentrates on the establishment of the flood safety level and flood risk reduction strategies. First developments in the study of loading and soil properties until 1960 are described in Chapter 2. The storm surge of 1953 accelerated the process towards a more scientifically based approach. The philosophy of the Delta Committee is explained in Chapter 3. After the publication of the Delta Report in 1960, it lasted until 1996 until the policy was incorporated in a law. The developments in this period are described in Chapter 4 and the legislation of the safety standard can be found in Chapter 5. Newest developments are described in Chapters 6 and 7.Hydraulic EngineeringCivil Engineering and Geoscience
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