Sustainable development essay

sustainable development essay

Sustainable development - wikipedia

Of course, using a traditional bicycle has its advantages, but again it should be realized that this approach is considerably less efficient. One reason is the use of a so-called friction drive - the rear bicycle wheel acts upon the small roller of the motor/generator. While chain and belt drives (used in late 19th century pedal powered machines) have an efficiency of up to 98 percent, a friction drive is only 80 to 90 percent efficient (and wears much faster). This energy loss should be added to the 42.5 percent efficiency loss calculated above, which rises to 48.5 percent. Low tyre pressure will further decrease efficiency. It should be noted that there is also energy loss in the bicycle itself: your pedals are not attached to the rear wheel itself.

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Furthermore, there will be an additional slight loss as the battery stands idle, and the charge efficiency (also known as "charge acceptance" or "coulombic efficiency of the battery will deteriorate over time. And to meal make the calculation complete, you should actually also include the energy loss in the electrical device that you are powering (we won't do that here). An energy loss of 42.5 percent of naturally means that it takes 42.5 percent more effort or time to power a device (say, a blender) via electricity compared to powering the same device mechanically. This can be considered an acceptable loss if you are using solar panels or a wind turbine connected to a battery as an energy source, but it becomes rather problematic when you have to deliver the energy yourself. If you produce 100 watts of power and 42.5 percent is lost in the conversion, there is only.5 to 58 watts left to power the device. If you power the same device mechanically, you deliver 100 watts straight. You thus have to pedal 2 to 3 times as hard or as long if you choose to take the intermediate step of generating electricity and storing it in a battery. Traditional bicycles were not made to generate stationary power. It does not stop here. The second problem with the present approach to pedal power is that it uses a traditional bicycle on a training stand instead of a pedal powered machine built from scratch - as was the case at the end of the 19th century.

Generating electricity is very inefficient, there are several problems with the paper present-day approach to pedal power. First of all, it is important to know that generating electricity is far from the most efficient way to apply pedal power, due to the internal energy losses in the battery, the battery management system, other electronic parts, and the motor/generator. These energy losses add up quickly: 10 to 35 percent in the battery, 10 to 20 percent in the motor/generator and 5 to 15 percent in the converter (which converts direct current to alternate current). (Sources: 1 / 2 / 3 ). The energy loss in the voltage regulator (or dc to dc converter, which prevents you from blowing up the battery) is about 25 percent (sources: 1 / 2 ). This means that the total energy loss in a pedal powered generator will be 42.5 percent (calculation example for highest loss: 100 watt input 80 watt after 20 loss in motor/generator.5 watts after 25 energy loss in voltage regulator.5 watts after. You have to pedal 2 to 3 times as hard or as long if you choose to power a device via electricity compared to powering the same device mechanically.

sustainable development essay

Transport, bicycles And, development, essay

Or, you can pedal to generate electricity, which is then used to power the device. In the 1970s, most research was aimed at direct mechanical power transmission. Today, the interest in pedal powered machines is almost exclusively aimed at generating electricity, for instance for charging cell phones and laptops - products that did not even exist in the 1970s. With one exception (the fender Blender a pedalled powered machine to make smoothies the only pedal powered machinery that is now commercially available in the western world (offered. Windstream, convergence tech and, magnificent revolution ) are stands to fit your bike to, connected to an electric motor/generator and a battery - a combination that can quickly convert your regular road bicycle into an electricity generator. These are also the pedal powered machines which are used for educational and arts projects, like powering a music concert, a cinema projection or a supercomputer, or teaching kids the difference in energy use between, for instance, an incandescent light bulb and an energy saving. In an effort to raise awareness about energy use and global warming, the bbc even made a tv-programme in which an entire household was powered via these generators, with 80 cyclists generating up to. These multi-person pedal power generators were pioneered in the 1970s by the campus Center for Appropriate technology (ccat).

Critical analysis of ecologically sustainable

sustainable development essay

Visual identity: Communicating sustainable

More organizations are seeking people with an online presence to fill their empty positions. As Robert Niles points out. The Online journalism review blog, ebooks are one of the few forms of online media that people are willing to pay for. Many news organizations are looking to hire web developers, as pointed out by Andy boyle on his blog. . journalism schools probably arent teaching this skills, but most developers are self-taught anyway. For journalists thinking about the future, learning digital skills and being open to new things where seem to be common themes of success.

Then again, some journalists (a tv reporter and a freelance journalist ) are quitting their jobs in search of something else. What skills or jobs do you think journalists might have in the future? Have you figured out what you want in a journalism job? There are two ways to power a device by pedalling. You can power it directly through a mechanical connection - as was the case with all pedal powered machines for sale at the turn of the 20th century.

Basically, he uses analytics to determine ways to make stories more shareable, when to share the stories and how. This one is also about data, something that is becoming increasingly important to journalism. Here is a video report produced during a knight journalism Fellowship that explores issues in this area. Beyond the influx of social media and data information, were confronted with too much of every type of information. Although it can be argued that all journalists curate information in some regard, some organizations are making curation a job. Fast Company article talks about being a curator in chief.


This type of person also deals with our overload of information; they help answer questions that news stories leave unanswered. For more about this idea, read a post. Viral Meme Checker / Viral Video maker. Going viral is something everyone wants, even journalists these days. New York magazine also talks about how one journalist spends his time creating highlight snippets with the most linkability. Slideshows are also popular on the web. People who make awesome slideshows require someone who can write and create visuals. Many journalists already spend hours a day networking and creating engagement using social media. New York magzine also talks about the engagement editor for ProPoblia who uses crowd-sourcing to involve more people in journalism.

Eolss - introduction to, sustainable, development

To brush up on your headline-writing, you biography could start by reading poynters 10 questions to help you write better headlines. Social Media reporter / Aggregator. Andy carvin is well-known for his unique news role using Twitter to fact-check information. (see our interview with Carvin.) Other media organizations are finding useful ways to make sense of social media noise. Storify is one tool being used by journalists. This job is about investigating data to make digital content. New York magazine talks about the role of a data scientist at buzzfeed.

sustainable development essay

hooks, the cold opens, the dramatic climaxes, and that all-important period to help us make sense of the great glut of recent history. No matter what comes along streams, feeds, and walls, we will still have need of an ending, he says. Some newer titles in journalism include social media strategist, multimedia reporter and blogger. Here are some more jobs that are beginning to appear now: headline Optimizer. Headlines arent what they used to be, especially in the online world. Once you could be witty or silly or clever, depending on the story. And once you didnt have to worry about keywords. Today, headlines are often the way people find and decide to click on a story. Good headlines are still an art, yet they are a completely different style.

Print media is on its way out. Long-form stories arent being read. Weve all heard these laments, but dont fret yourself too crazy. If you look, youll find plenty of signs that this field wont go away. Journalism isnt dying; its evolving. To survive, were all going to have to get more creative and adapt as new technologies and methodologies appear. The traditional plan titlesreporter, copy editor, photographer, page designermay fade away or take on new meanings yet journalism wont altogether become extinct, even despite corruption and the frustration felt by overworked, underpaid journalists. Journo jobs still exist, a story in The Atlantic by james Fallows says this at the beginning of an article about the future of journalism : guess what? And an essay from paul Ford.

Essay, topics on developing countries

If you are a tanzanian postgraduate student living in Tanzania, here is your turn to have your say! The online world Bank wants to hear your ideas on how the private sector can help the public sector initiate better public infrastructure, and other public services in Tanzania. Private public Partnership (PPP) Essay competition, and you could win an attachment to the world Bank in Tanzania! How to enter: The question we want you to answer—the topic of our essay—is: How can the private sector help deliver better public services in Tanzania? Tell us how the private sector can help provide tanzanian communities with better public infrastructure and services in no more than 1,000 words. Submit your own essay by february 23, 2018, to, any questions, or is there more information you need? Contact us via the same email. Written on August 4, 2011.


Sustainable development essay
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5 Comment

  1. Free shipping on qualifying offers. The city in the twenty-first century faces major challenges, including social and economic stratification.

  2. Print media is on its way out. Long-form stories arent being read. Weve all heard these laments, but dont fret yourself too crazy. If you look, youll find plenty of signs that this field wont go away. Sun - nasa video solar anatomy extensive collection of excellent honeybee videos and images - arkive hobos : HOneybee online Studies - 2013 - website - jurgen tautz et al The lif. Sustainable Urbanism and beyond: Rethinking Cities for the future tigran haas.

  3. The world Bank Group works in every major area of development. We provide a wide array of financial products and technical assistance, and we help countries share and apply innovative knowledge and solutions to the challenges they face. I have difficulty in getting some of my students to organise their ideas in a coherent manner when it comes to essay writing, especially persuasive writing. Pedaling a modern stationary bicycle to produce electricity might be a great work-out, but in many cases, it is not sustainable. While humans are rather inefficient engines converting food into work, this is not the problem we want to address here; people have to move in order to stay healthy, so we might as well use that energy to operate.

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