Natuurrampen : Soorten Deze bijdrage bevat hyperlinks naar filmfragmenten, die ondersteund worden met uitleg in de presentatie. Op die manier worden de betekenis en de gevolgen van een natuurramp telkens toegelicht.
FotografÃa en movimiento: Filmmaking DSLR
Recopila, sintetiza y detalla los contenidos trabajados en cada una de las sesiones del taller organizado por Espacio-Red de Prácticas y Culturas Digitales (UNIA)
Glucose Fuel Cells: Brain-Implantable Electronic Devices that Run Like the Brain "Glucose Fuel Cells: Brain-Implantable Electronic Devices that Run Like the Brain": Video component of the Application for the 2012-2013 Lemelson-MIT Student Prize, by Benjamin I. Rapoport.
Managing coastal environments
Coastal environments are by their nature ever-changing. This unit looks at the example of the Blackwater Estuary in Essex, England, describing how the current state of the estuary came to be. It examines the contests and conflicts that centre on the estuary in terms of managing the environment for human needs and the needs of the other species who make their habitat there.Author(s):
Introduction to microscopy
This free course provides an introduction to microscopy and the operation of a simple light microscope, of the type found in histology courses and teaching laboratories. It outlines different methods used for preparing and staining tissue sections for microscopy, and explains how different stains can be used to identify particular cells, pathogens and anatomical structures.Author(s):
3 Reading activity You will shortly be asked to read through a research paper published in the Journal of Medicinal Chemistry, in which the synthesis and structure–activity relationships of doxazosin and related compounds are described. It has been provided: 1.5 Clades and mammals Are the mammals a clade? Yes, despite Simpson's earlier reservations about their possible polyphyletic origins, morphological and molecular data now st 1.2 Taxa and relationships Until the mid-20th century, inferences about evolutionary relationships between species were generally based upon as wide a range of evidence as could be mustered. Evolutionary systematics is the name given to this eclectic approach, because of its explicit focus on evolutionary conclusions. The disparate nature of the evidence used (ranging from the taxonomic attributes and geographical distribution of living organisms to the stratigraphical distribution of fossils) meant that there w Introduction This unit is from our archive. It is an adapted extract from the Science (S365) module that is no longer in presentation. If you wish to study formally at The Open University, you may wish to explore the courses we offer in this Curriculum Area This unit is concerned with macroevo 4.2 Intermediate forms In essence, the argument about intermediate forms runs as follows. If whales evolved from a terrestrial ancestor through the accumulation of small differences over time, we should expect to find the fossils of a number of ‘missing links’, i.e. creatures with a mixture of terrestrial and aquatic characteristics. In fact, we might expect to find a succession of such animals, each a little bit more whale-like and a little bit less well adapted to life on land than its predecessor. To m 2.3 Moving about Water is more viscous than air, so it can take more effort to move through water (try running in a swimming pool). Friction between the body and the water causes turbulence, which holds a swimmer back, and the faster the swimmer tries to move, the greater the turbulence. One way of avoiding the problem is to leave the water for short periods and travel through air, and some of the smaller pinnipeds and cetaceans resort to ‘porpoising’, leaping from the water for short periods when they ne 8 Reviewing and reflecting
Figure 55 is a conceptual diagram that summarises this unit. Molecules are made of atoms, so it was with atoms, to the left of Figure 55, that we began. Early in Section 1 they acquired a structure with a positively charged nucleus surrounded by negatively charged electrons. To a chemist, the most important property of an atom is the 5.2 Summary of Section 5 The structural formulae of organic molecules can be divided into the carbon-hydrogen framework or skeleton, and the functional group(s). In the first approximation, the functional groups are the sites where reaction occurs, the framework remaining unreactive. This approximation works best when the framework consists of saturated carbon atoms. 4.5 More about covalent bonding So far, the valencies in Table 1 have just been numbers that we use to predict the formulae of compounds. But in the case of covalent substances they can tell us more. In particular, they can tell us how the atoms are linked together in the molecule. This information is obtained from a two-dimensional drawing of the structural form 1.2 Chemical elements Atoms of the same atomic number behave virtually identically in chemical reactions. They are therefore given the same chemical name and chemical symbol. For example, the atom of atomic number 6, which is shown in Figure 1, is a carbon atom, whose symbol is C. All materials are made of atoms, but there is a special class of substan 6.2 Specific difficulties Some students contend with physical difficulties in reading. Here is one:
And here is another being offered advice by a friend:
3.1 Overview Scattering calculations using wave packets are so laborious that they are generally done numerically, using a computer. However, in many cases, scattering phenomena can be adequately treated using a procedure based on stationary states. This approach can give valuable insight into the scattering process without the need for computer simulations. Session 3 introduces the stationary-state approach to scattering. The discussion is mainly confined to one dimension, so a stationary-state sol 2.1 Overview Session 2 discusses the scattering of a particle using wave packets. We shall restrict attention to one dimension and suppose that the incident particle is initially free, described by a wave packet of the form This is a superposition of de Broglie waves, with the function Acknowledgements The content acknowledged below is Proprietary (see terms and conditions). This content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence The author of this unit is Peter Sheldon. Grateful acknowledgement is made to the following sources for permission to reproduce material 4.4 Other Wenlock Limestone fossils Among the other fossils common in the Wenlock Limestone are brachiopods (Figure 12a and b), gastropods (Figure 12c) and bryozoans (Figure 12d). You may need to reread Section 1.3 to remind yourself about various aspects of these groups. Figure 13 (the unit image) is a reconstruction of a typical scene from a Wenlock Limestone environment. See
SAQ 3
Answer
Author(s):
