Pages 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 9827 result(s) returned

4.4.2 Geothermal energy

Geothermal energy is another renewable source that is not derived from solar radiation. As the name implies, its source is the earth's internal heat, which originates mainly from the decay of long-lived radioactive elements. The most useful geothermal resources occur where underground bodies of water called aquifers can collect this heat, especially in those areas where volcanic or tectonic activity brings the heat close to the surface. The resulting hot water, or in some cases steam, is used
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

4.3.1 Wind energy

When solar radiation enters the earth's atmosphere, because of the curvature of the earth it warms different regions of the atmosphere to differing extents – most at the equator and least at the poles. Since air tends to flow from warmer to cooler regions, this causes what we call winds, and it is these air flows that are harnessed in windmills and wind turbines to produce power.

Wind power, in the form of traditional windmills used for grinding corn or pumping water, has been in use
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

1.1 Formal handover

The outputs of a project should be defined at the planning stage, including any conditions that will be required for a smooth transfer. Each outcome should be formally handed over to the sponsor who should confirm their delivery (‘sign them off’) so that there is no dispute about whether outcomes have been completed.

A closure list is likely to have sections to include the following groups of tasks, but each project will have different features to consider. A list of suggested areas
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

3.6 Summary

This section has described how fossil fuels provide the majority of the world's energy requirements, with bioenergy, nuclear energy and hydropower also making major contributions. The other 'renewable' energy sources currently supply only a small fraction of world demand, although the contribution of these 'renewables' seems likely to grow rapidly in coming decades, as we shall see in the following section.


Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Ann Cooper Talks School Lunches
19:38 Video Speaking at the 2007 EG conference, "renegade lunch lady" Ann Cooper talks about the coming revolution in the way kids eat at school -- local, sustainable, seasonal and even educational food.
More: http://www.edu-cyberpg.com/NCFR/health.html


Author(s): No creator set

License information
Related content

7.2 Types of active galaxy

  • All active galaxies have a compact, energetic nucleus - an AGN.

  • Seyfert galaxies are spiral galaxies with bright, point-like nuclei which vary in brightness. They show excesses at far infrared and other wavelengths, and have strong, broad emission lines.

  • Quasars resemble very distant Seyfert galaxies with very luminous nuclei. They are variable. About 10% are strong radio sources thought to be powered by jets of material mo
    Author(s): The Open University

    License information
    Related content

    Copyright © 2016 The Open University

2.1 Planning your search

Your approach to searching will depend to a great extent on what kind of person you are. In an ideal world, when searching for information for a specific purpose, we would all find what exactly we were looking for at the first attempt, especially if we are in a hurry. However, it's always a good idea to have some kind of plan when you are searching for information, if only to help you plan your time and make sure you find the information you need. If I was starting to search for material on h
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

The Plant that Eats Bugs
Learn about the Venus Fly Trap - the carnivorous plant that eats bugs - in this brief, educational video. (00:16)
Author(s): No creator set

License information
Related content

2.7.4 Identities are contextual and interactional

Different identities assume greater or less importance, and play different roles, in different contexts and settings, and in interactions with different people. Different aspects of people’s identity may come to the fore in the workplace and in the home, for example, while people might emphasise different aspects of themselves to different people (and different people may see different identities when they meet them).


Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Cijferend optellen en aftrekken tot 10 000
chalkboard-304221_1280.png

Werkblad waarmee leerlingen het cijferend optellen en aftrekken tot 10 000 (zonder en met ontlening bij 1, 2 of 3 cijfers) inoefenen.


Author(s): No creator set

License information
Related content

7.3 The eukaryotic chromosome

Whilst the bulk of eukaryotic DNA is packaged by proteins different from those in the eubacterial chromosome, the principles of bending DNA and neutralising the negative charges in its backbone are shared. Eukaryotic cells have considerably larger genomes than do prokaryotes (in most cases over 1000 times the size of the E. coli genome – see Author(s): The Open University

SEM image of open cell polyurethane foam
If a gas is injected into a liquid it forms a cellular foam structure. When a thermoset prepolymer of low viscosity is foamed, the polymer can drain from the cell walls (driven by surface tension) before it sets at the cell edges, leaving an open-celled foam. The cell edges have three concave sides, giving rise to the tri-cuspid cross section visible at the bottom of this image. The average co-ordination number for the nodes (where struts meet) is four, giving tetrahedral junctions.
Author(s): DoITPoMS, University of Cambridge,J A Curran, Depa

License information
Related content

http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

2 The biology of prions

The increasing interest in kuru during the 1950s and 1960s had the effect of stimulating research into TSEs in humans and other animals.

Question 6

Summarise, in general terms, the possible causes of disease in animals.
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

How Ending Tax-free Tuition Waivers Could Impact U.S. Higher Ed
As Congress works on its final tax overhaul bill, tax breaks on tuition waivers for graduate students are one of many provisions that hang in the balance.
Author(s): No creator set

License information
Related content

Rights not set

FORMGRIP closed cell aluminium foam
Additions such as SiC are made to molten aluminium or aluminium alloy to modify the melt viscosity and make it suitable for foaming. 1 to 3 wt% of pre-oxidised titanium hydride is then added to the melt which is solidified to form a precursor which can be foamed in a controlled manner by a subsequent heat treatment. The resulting foam has a relatively fine and uniform cell structure.
Author(s): DoITPoMS, University of Cambridge,Dr V Gergely, De

License information
Related content

http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Student views of the OU
OU students talking about the benefits to them of studying with the OU.
Author(s): No creator set

License information
Related content

2.4 The slippery language of ‘family’

Most fundamentally, however, we need to understand how language is used, and what ‘work’ it does as we interact with others in our everyday lives. As the sociologist and philosopher, Alfred Schutz (1954) argued, it is important to pay careful attention to the relationship between sociological and everyday concepts, since everyday concepts express the meanings by which social interactions are framed. So how do people themselves understand, encounter, interpret and evoke the very slippery c
Author(s): The Open University

License information
Related content

Copyright © 2013 The Open University

Writers reading: favourite books

Authors: 
Michiel Heyns, Finuala Dowling, Imraan Coovadia, Yewande Omotoso, Henrietta Rose-Innes