How the Differential Gear works - 1930s video An excellent engineering video on how the differential gear works in an automobile, allowing each of the driving wheels to rotate at different speeds. This was an important innovation for cars to be able to smoothly turn corners.
How marbles are made This episode of How It's Made first shows how regular marbles are produced in a factory. The next part shows how more intricate marbles are handcrafted.
2.4 Summary of Section 2 The water cycle involves the movement of water, in all its forms, over, on and through the rocks near the surface of the Earth in a cycle. This cycle is driven by the Sun's energy and the Earth's gravity. The total volume of water in the cycle is virtually co
2.1 Where water occurs and how we measure it When astronauts first ventured to the Moon in the late 1960s, they were captivated by a vision of the Earth in colour as it had never been seen before (Figure 2). It is not surprising that, after pictures like this were published, the Earth became known as the ‘blue planet’. 1 The power of water The ways in which human activities interact with the water cycle can have devastating consequences for all forms of life. These range from the very large scale – for example, the effects of the movement of large volumes of water in a tsunami – to the molecular scale and the ability of water to dissolve solids, such as agricultural fertilisers (Figure 1). 9.1
Iron (Fe) The ability of blood to carry oxygen is due to the presence of the red pigment, haemoglobin, present in red blood cells. Haemoglobin is a protein formed from four polypeptide chains called globins, in the centre of each of which is a small non-protein part called a haem group (haima is Greek for ‘blood’). Each of the haem groups has an iron atom within it (Author(s): 6.1 Trace elements The trace elements (also known as minor minerals or microminerals) are those that occur in quantities of less than about 5 g in the body. The more important ones are listed in Table 5, though not all of them will be considered here. 1 1.2 How DNA is replicated Cell division involving the nuclear division of mitosis produces two progeny cells, which contain identical genetic material, which is also identical with that of the original parent cell. This is how a fertilized egg grows into an adult many-celled organism. For one cell to become two new ones with identical genetic material, the DNA in each chromosome must undergo a process in which an identical copy is made. As noted above, Watson and Crick postulated that DNA base-pairing provides a Acknowledgements The content acknowledged below is Proprietary (see terms and conditions) and is used under licence. Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit: 1.7.4 Use of academic language An important part of research is engaging in the discourse, i.e. communicating research ideas, processes, and results so that they may be scrutinised and discussed. Good communication relies on understanding the conventions of the community. Hence, one key skill is the demonstration of competent academic language. This includes: correct use of technical terms attention to detail in punctuation, grammar, etc. attention The Basic Concepts Lecture 10 (December 14, 2009) Portrait of Agnes Taylor Web Based Catalogue of Online Experiments Requirements and Solutions for Personalized Adaptive Learning The pedagogical challenges to collaborative technologies The North Atlantic Treaty Organisation’s New Strategic Concept Using visualizations to teach problem-solving skills in mathematics: Which kind of visualization wor The impact of example comparisons on schema acquisition: Do learners really need multiple examples? Cognitive tools for discovery learning Problems and Opportunities of Learning together in a Virtual Learning Environment
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science, physics, particle physics, quantum field theory, particle interactions, lagrangian, wave, momentum, energy, phase velocity, wave, quantum mechanics, velocity, momentum, relativity, quantum, mechanical, wave, particle movement, initial state, elec
Pomona College student Agnes Taylor. [Photograph of a photograph; original photograph taken by the studio of Hugo Schwichtenberg in Pomona.]
A knowledge base of online experiments was built. It is a kind of catalogue describing online experiments used for educational purposes. Metadata for describing this special kind of learning resources and analysis of experiments available in the catalogue (both virtual and remote) are presented in this paper. Examples of online lab experiments and exercises are developed by different European universities are also described.,Research report of the ProLearn Network of Excellence (IST 507310), Del
In D1.1 we analyzed the available solutions. Current learning environments are typically web based, but they usually do not take into account heterogeneous needs of users and provide the same learning material to students with different knowledge, objectives, interests, and in different contexts. Currently there is no technical standard for the communication between the various personalized adaptive learning tools as well as no metadata standard for meaningful exchange of learner model and learn
Collaborative technologies offer a range of new ways of supporting learning by enabling learners to share and exchange both ideas and their own digital products. This paper considers how best to exploit these opportunities from the perspective of learners' needs. New technologies invariably excite a creative explosion of new ideas for ways of doing teaching and learning, although the technologies themselves are rarely designed with teaching and learning in mind. To get the best from them for edu
The North Atlantic Treaty Organisation (NATO) is a politico-military alliance of countries from Europe and North America. It provides a unique link between these two continents for consultation and cooperation in the field of defence and security, and the conduct of multilateral crisis management operations. In his only public lecture in Australia, NATO's senior military commander, Admiral Giampaolo Di Paola, will speak on NATO's new Strategic Concept, its relationships with allies, and operatio
In the experiment described in this paper we investigated the effects of different kinds of computer-based visualizations on the acquisition of problem-solving skills in the domain of probability theory. Learners received either purely text-based worked examples, text plus an instruction to mentally imagine the examples contents, or they could retrieve either static pictures or concrete animations that depicted the problem statement and the problem states achieved by applying a specific solut
Comparing multiple examples within problem categories is usually considered a necessary prerequisite for schema acquisition. However, there is an evident lack of conclusive empirical evidence supporting this claim. Moreover, there are findings indicating that carefully designed one-example conditions may allow for profitable processes of example comparison as well. In line with this reasoning, we present an experiment - that builds up on a series of studies conducted by Quilici and Mayer (1996)
Cognitive tools, defined here as instruments that support or perform cognitive processes for learners in order to support learning, can bridge the difference between open learning environments, like discovery learning environments and traditional supportive instructional environments. This article discusses a definition of the concept of cognitive tool and its use in learning. Two examples of cognitive tools for discovery environments are presented, and it is made clear how these tools can serve
This chapter explores new ways of collaborative learning in a virtual learning environment based on our acquisition of knowledge from previous experience. We identify both the problems faced in real collaborative learning practices and the ways these problems can be overcome and become opportunities for more efficient learning. These issues concern pedagogical, organisational and technical elements and constraints that influence the successful application of collaborative learning in distance ed
