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ABSOLUT
KYBERIA
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30 ❤️


show[ 2 | 3] flat


Kwisatz Hade...0
pht0
unsane0
tali0
0
hado0
pstmn0
jonas0
tp0
toledun0
XcomeX0
rytier kozmo...0
benedict gla...0
jard00
dusand0
keiro0
Burning A0
mnemonic0
_W1 22/70
miko60
tom_myto0
Kuzmics0
timko0
al-caid0
klr kdd0
huno0
niekt00
maaca0
RataFuck von...0
hash.meer0
matt0
bujak0
cyberpunker0
dp0
rzelnik0
jurov0
smrtak0
sob0
Phaceo0
arci_de.fault2
baran3
stanley_ptaaach4
lmsr4
_4
Fen4
niko5
jedlovec5
darmozrac5
cyboff5
ooo5
5
mojo5
zeromind5
kyberbubus5
phonic5
mister.shadow5
kubriel[Lock...5
andread5
ode5
killya7
peal7
Faun7
fk7
mzpx8
hlsman8
frwolf8
savabian8
asebest9
pokurvene ho...9
Best boy9
DFH9
R@10010
4mood11
61812
symphonybrother12
k0zmonAut12
drakh12
zapalka13
maraki14
BRIAN WASHING14
DzejAr14
wern15
174417
s719
mimikk20
Odi21
(baky)21
arius21
ruy24
sparhawk25
mrkqua25
Crevo25
cv::be26
falosean26
bashka26
kabal27
Huto29
scarce29
robo30
eyes wide open40
eSBe42
Pieter42
lula42
Sante42
oxid44
totosomsivym...44
farebna44
44
neon44
nie vsetko nove a moderne je aj skutocne prakticke a uzitocne

ontopic
- jednoduche a hlavne dlhodobe riesenia
- prakticke prevedenie, nizke naklady
- urob si sam [#DIY], dostupnost pre masy [#open-source]

.:. odkazy .:.

topic in construction, kto by chcel pomoct s tvorbou ci upravou, nech sa vklude ozve




  • 00000101000635290663837209085289
    Zaujímavý prístup k využitiu solarnej energie napriamo, bez batérií.
    https://solar.lowtechmagazine.com/2023/08/direct-solar-power-off-grid-without-batteries/

    Skúšal to tu niekto? Aspoň experimentálne? Mám chuť si kúpiť nejaký malý solárny panel a skúšať, čo to dokáže.
    more children: (2)
  • 00000101000635290663837209084420
    timko 29.08.2023 - 09:47:15 level: 1 UP New
  • 00000101000635290663837209046996
    RataFuck von Plachta 07.03.2023 - 10:38:50 level: 1 UP New
    Zdarec

    Premyslam ze by som spravil automaticke mechanicko-teploroztazne otvaranie povrchu pareniska.
    Ide mi o to nech sa bez elektroniky po nejakom case ako bude piect slnko na nejake medium(nadrzka s vodou, kov) toto skombinoval s tepelnou roztaznostou kovu a aby mi to nadvihlo lahsi kryt pareniska.

    Je to vobec realne?
    Videli ste nieco take? Akykolvek tip alebo pripomienka bude fajn.


    diikez


    Żubr żuł żuchwą żurawinę
    more children: (6)
  • 00000101000635290663837209033323
    https://arstechnica.com/science/2023/01/i-disconnected-from-the-electric-grid-for-8-months-in-manhattan/

    On May 22, 2022, I began an experiment. I unplugged everything in my apartment, with the goal of drawing zero power from the electric grid for one month. I had no idea how I would make it past a few days.

    Nevertheless, I opened the main circuit, disconnecting my apartment from the grid and committing myself to solving what problems arose as they came. As I type these words in January, I’m in my eighth month. My Con-Ed bills continue to show zero kilowatt-hours.

    Ars Technica readers undoubtedly want to know about my equipment. We’ll get there, but first let me share my history, motivation, and constraints.

    Why would I do this?

    Today, more than half the world lives in cities. I've always thought that living "off the grid" meant living "off in the woods," where you can live simply and set up an alternate power source. But I’m a professional in Manhattan and need to earn a living. I have to meet the expectations of professional service from my clients and from New York University, where I teach leadership and entrepreneurship. Before this experiment, I didn’t believe my lifestyle would let me disconnect from the grid for a day, let alone longer.

    But that sort of thinking was in tension with my work. Over the years, I have helped leaders in business, politics, and other fields learn to lead on sustainability. These leaders can then change their organizations’ and constituencies’ cultures and practices to embrace sustainability. Even though corporate and policy choices matter more than those of any individual, I was still curious to see if I could make my own practices more sustainable. Personal responsibility matters to me, so polluting less motivates me; it's a small thing, but one I can control, even if it's important to make policy and political changes, too.

    And I wanted to see how easy (or difficult) this might be for other city dwellers—both to help with sustainability and with utility bills. The Wright brothers didn’t need to make a 747 or a global network of airports to show that controlled powered flight had potential. Showing success once created the mindset shift that led to a process of continual improvement among innovators, who did the rest. So who knows? Perhaps my story will inspire a few innovators (maybe even you!).

    In addition to the obvious benefits that reduced power consumption brings, there’s also the issue of grid resilience. If everyone could stand a few days without grid power, we could build grids that aren't made for 99.9 percent uptime but for 95 percent or lower uptime (with dedicated power for essential services like hospitals, police, and subways). At some level of local resilience, we could power cities exclusively with solar and wind despite their intermittency, with much lower battery needs.

    Unplugging gradually

    I started my personal sustainability drive almost accidentally, when I challenged myself to avoid packaged food for a week. I expected deprivation and sacrifice from avoiding Manhattan’s abundant food options. If I’m honest, part of me hoped to find the challenge untenable so I could say the cure was worse than the disease and give up.

    But constraints breed creativity. I learned to cook from scratch, which led to more of what I valued in food: flavor, variety, convenience, nutrition, and socializing, while lowering costs and pollution.

    The unexpectedly rewarding results motivated me to keep going. I avoided flying for a year and experimented with unplugging my fridge. By May 2022, when I decided to disconnect completely, I hadn’t filled a load of trash since 2019, hadn’t flown since 2016, had unplugged my fridge for eight months, and had electric bills consistently under $2 (not counting fixed connection charges of about $18).

    Some of the hardware on an especially productive day.
    Some of the hardware on an especially productive day.
    Joshua Spodek
    Each change forced me to apply new skills but brought new benefits as well. One illustrative example was my progression from 1) limiting social media to 2) avoiding one or two specific time-wasting sites to 3) avoiding all sites that refresh at least daily (with some exceptions) to 4) making airplane mode almost the default for my cell phone. Each step made the next clear and simple. Now I don’t see myself going back. In addition to regaining lost time, I live with more intention, less hope to be passively entertained—and frankly, less addiction.

    My other experiments followed similar patterns. I couldn’t reduce consumption in three significant areas since I don’t own a car, I was already vegan, and I have no children. Still, I sold my TV, reduced my use of appliances, bought less stuff, and reduced heating and air conditioning. Contrary to my expectations, these moves created freedom, joy, and fun.

    I started wondering if I could do a month on zero kilowatt-hours from the grid.

    Constraints

    I had no hands-on experience with solar equipment, but I have a PhD in astrophysics and own a few patents, so I understand power, energy, and technology. I wasn't going to wait for my building’s board to approve a permanent installation of solar panels, and my apartment receives little direct sunlight. I’m single, so I could act unilaterally, but I had no access to economies of scale.

    I searched Craigslist for used solar equipment, which meant the pickings were slim. I settled on using portable panels and a portable power station—a fancy name for a battery with many options to power and to be powered. I settled on a 576-watt-hour power station by Ecoflow and a 200-watt foldable panel by Bluetti, both used, discounted about 30 percent from retail.

    That’s it.

    I had no idea if that capacity was high or low—one point of the experiment was to find out. I allowed myself one cheat: I could plug in my laptop and phone when working at New York University. Otherwise, my only electric power came from the solar panel and battery. I still used my building’s hot water but not my gas stove.

    Did the constraints hold me back? On the contrary, they forced me to keep trying until I found what worked.

    What happened

    The experiment wasn’t easy. I had to remind myself that my goal was to develop a proof of concept. My building is 15 stories, and using the elevator would undermine the experiment, so I climbed 11 flights of stairs—twice on days that I charged—three or four days per week. I’m 51, so this could be a slog.

    I learned that my setup was underpowered for my needs, but I was determined to make it work. I learned to time my activities around the sun. In direct sunlight, the panels fully charged the battery in about four hours. A cloudy day could mean the battery wouldn’t fully charge, but between planning and my NYU cheat, I missed zero meetings.

    Some changes that made the experiment work included reading more books, writing by hand, choosing salads over cooked foods, going out instead of staying in, and shifting work to daytime hours. At first, I considered these changes sacrifices, but looking back, I view them more as a cultural shift, a bit like when I lived overseas and couldn’t find a good bagel. Finding the local equivalent—croissants in Paris or vegetable steamed buns in Shanghai—worked better than complaining, and it expanded my world.

    Whenever I was tempted to lament the sacrifices I was making, I reminded myself that people have been living in Manhattan for around 10,000 years—technology shouldn’t make me less able or resilient than them.

    The one thing I couldn’t sacrifice was my pressure cooker, which was the most efficient way to cook (and my greatest single consumer of energy). A full battery charge would power the cooker to make stew good for five meals and still leave a couple of hours’ charge for my computer and phone. I used almost no other appliances. I began waking up with the sun at 5 am to avoid needing lights. My battery has a one-watt LED that sufficed for cooking and eating, so I haven’t used my floor lamp.

    I ate more greens and uncooked food. I fermented more, too. Growing up, my family didn’t do this, so I had to learn—from online tutorials first, then through finding others who were into fermentation. I started by salting cabbage to make sauerkraut, then vinegar from chopped apples in water. With experience, I expanded to kombucha, chutney, and more. I sprouted grains and legumes to make them edible (and delicious) without cooking.

    There were unexpected benefits. All the stair climbing freed up time from my regular periods of jogging and cardio exercise. Avoiding power-hungry videos online freed a surprisingly large amount of time, leading to more reading, writing, and volunteering in my community. I wrote more by hand, which I believe improved my writing. I made more progress on my book than I expected. All these things saved money and time. That surprised me at first, but now the benefits seem obvious.

    Not everything was simple, of course.

    Challenges

    My first big challenge came from three rainy days in a row. No solar power meant cutting back on everything except client meetings, scheduled podcast recordings, and judiciously using my NYU cheat.

    The other piece of key hardware: the battery.
    The other piece of key hardware: the battery.
    Joshua Spodek
    My second big challenge was that my equipment broke—the panel once and the battery twice. I recorded a podcast episode when they broke, saying that I was about to “declare victory”—that is, give up—and reconnect. But after recording, I saw I had enough food that didn’t need cooking, so I was to make it through another day. I hung on until replacements arrived from the manufacturers, which took over a month, since buying my devices in used condition meant I didn’t have receipts.

    My power system wasn’t the only thing that presented problems. My laptop battery also broke, as did its charger. I can’t tell if they broke due to the experiment, but they’ve never broken before.

    Regarding my NYU cheat, I found ways to reduce NYU’s consumption to compensate for what I used, like turning off lights and unused public terminals. It’s possible that, at least for this experiment, my net power use at NYU was negative—though that's not likely, and I still relied on grid power there.

    Lessons

    Here are some lessons I learned, in no particular order.

    Intermittency is no joke! Before this experiment, when people criticized wind and solar for their unreliability, I minimized the issue, pointing out how much solar energy hits the Earth. But nothing compares with experiencing intermittency on a personal level.

    One thing I learned is that a larger battery (700 to 1,000 watt-hours) would probably be worth it. Asking for receipts when I bought my used equipment could have saved weeks when they needed replacement. More food preparation skills would have helped at the start.

    Attitude was more important than technology, though. Attitude made my setup doable. I’m not suggesting that "because I could do it, you can do it," but I did tell myself that if humans could do without power for 300,000 years, then I could do so for a month.

    The experiment inspired me to learn from indigenous cultures about their practical knowledge of doing without power, including from guests on my podcast who lived among the San in the Kalahari Desert, Hadza in Tanzania, Kogi in Colombia, Tsimane in Bolivia, and Matsés in Peru. Some cultures have lived tens to hundreds of thousands of years with no electrical power—talk about resilience—and continue to choose not to adopt it.

    From them, I learned to appreciate cultural activities with friends, family, and community, like preparing food, making clothes, gathering plants, singing, dancing, and storytelling. I switched from seeing these things as luxuries to experiencing them as time and money savers. I still live in Manhattan, but I now feel I’m living in a different culture, one that values resilience, creativity, humility toward nature, and responsibility to others affected by my actions.

    My top goal

    Regardless of any wider effects of my experiment, it has been important to me personally. A biography of Abraham Lincoln led me to a quote of his: “Nothing is more damaging to you than to do something that you believe is wrong.” In polluting as much as I was for my comfort and convenience, I was doing something I believed was wrong. Resolving that issue has at least helped me sleep better at night.

    But I hope it has wider results.

    I started calling the experiment my Kitty Hawk moment in honor of the Wright brothers’ first controlled powered flight. Technically, Kitty Hawk was their headline-making breakout, so my experiment was more like an earlier Wright brothers test, after which they saw their success as inevitable.

    With Kitty Hawk, the brothers showed the world what was possible. You could argue that they failed, as their plane couldn’t transport other people or cargo, it wasn’t safe, and it couldn’t go far. And they didn’t create an airport, let alone a global network.

    You could say their individual action didn’t matter and that only governments and corporations could act on the necessary scale. (And large-scale energy changes will indeed need to come from the top.) But the Wrights shifted the world’s mindset, leading to a global process of continual improvement. They unleashed others to act, leading to then-unimaginable results.

    And that’s what I hope to see. I would love for people to read this article and think, “You can do that? I want to try!”... and then outdo me.

    Joshua Spodek, PhD, MBA, hosts the This Sustainable Life podcast. He is a four-time TEDx speaker, the author of Initiative and Leadership Step by Step, and an adjunct professor at NYU.
  • 00000101000635290663837208844535
    timko 21.02.2021 - 18:21:25 level: 1 UP [1K] New
  • 00000101000635290663837208650742
    Synapse creator 06.08.2019 - 22:18:30 (modif: 06.08.2019 - 22:18:57) level: 1 UP [10K] New Hardlink Content changed
    https://en.wikipedia.org/wiki/Radiative_cooling#Nocturnal_ice_making_in_Early_India_and_Iran

    Scientists are using the cold of outer space to rethink air conditioning
    https://qz.com/1681465/scientists-invented-air-conditioners-for-the-climate-change-age/

    Passive radiative cooling below ambient air temperature under direct sunlight
    https://www.nature.com/articles/nature13883

    Cooling is a significant end-use of energy globally and a major driver of peak electricity demand. Air conditioning, for example, accounts for nearly fifteen per cent of the primary energy used by buildings in the United States1. A passive cooling strategy that cools without any electricity input could therefore have a significant impact on global energy consumption. To achieve cooling one needs to be able to reach and maintain a temperature below that of the ambient air. At night, passive cooling below ambient air temperature has been demonstrated using a technique known as radiative cooling, in which a device exposed to the sky is used to radiate heat to outer space through a transparency window in the atmosphere between 8 and 13 micrometres2,3,4,5,6,7,8,9,10,11. Peak cooling demand, however, occurs during the daytime. Daytime radiative cooling to a temperature below ambient of a surface under direct sunlight has not been achieved3,4,12,13 because sky access during the day results in heating of the radiative cooler by the Sun. Here, we experimentally demonstrate radiative cooling to nearly 5 degrees Celsius below the ambient air temperature under direct sunlight. Using a thermal photonic approach14,15,16,17,18,19,20,21,22,23,24,25, we introduce an integrated photonic solar reflector and thermal emitter consisting of seven layers of HfO2 and SiO2 that reflects 97 per cent of incident sunlight while emitting strongly and selectively in the atmospheric transparency window. When exposed to direct sunlight exceeding 850 watts per square metre on a rooftop, the photonic radiative cooler cools to 4.9 degrees Celsius below ambient air temperature, and has a cooling power of 40.1 watts per square metre at ambient air temperature. These results demonstrate that a tailored, photonic approach can fundamentally enable new technological possibilities for energy efficiency. Further, the cold darkness of the Universe can be used as a renewable thermodynamic resource, even during the hottest hours of the day.

    more children: (2)
  • 00000101000635290663837208520628
  • 00000101000635290663837208499791
    Ditch the Batteries: Off-Grid Compressed Air Energy Storage

    6a00e0099229e888330224e0391880200d-500wi

    Going off-grid? Think twice before you invest in a battery system. Compressed air energy storage is the sustainable and resilient alternative to batteries, with much longer life expectancy, lower life cycle costs, technical simplicity, and low maintenance. Designing a compressed air energy storage system that combines high efficiency with small storage size is not self-explanatory, but a growing number of researchers show that it can be done.
    http://www.lowtechmagazine.com/2018/05/ditch-the-batteries-off-the-grid-compressed-air-energy-storage.html
    more children: (1)
  • 00000101000635290663837208469072
    ooo 11.03.2018 - 20:29:08 level: 1 UP [5K] New
    Dokument o chlapikovi co si postavil dom. Radost kukat:)
    https://youtu.be/ErGQ0rXkn74
    more children: (2)
  • 00000101000635290663837208443998
    ooo 13.01.2018 - 18:51:55 level: 1 UP [6K] New
    Jak uchovavat potraviny v krechtu

  • 00000101000635290663837208429302
    smrtak 09.12.2017 - 02:45:30 (modif: 09.12.2017 - 02:46:40) level: 1 UP [1K] New Content changed
    x0+uvVjNZGq5fgHmg2M=.sha256

    The structure was designed to offer temporary shelter for an event and then decompose to leave behind fertile soil and food for downstream creatures (insects, birds, microorganisms). I love this idea! Imagine the nomadic among us moving from one seasonal work/play camp to another, with mycohabitations biodegrading after use to enrich the local ecosystem. It will be fascinating to see what people come up with, both in terms of living mycelial structures and inert applications. Some folks in the Netherlands are already working on 3D-printing substrate-mycelium objects.
    https://viewer.scuttlebot.io/%25O%2FezksaY4abBmucCDEvyAJWOhLAdNC4ioGSqgPs3%2FIg%3D.sha256
  • 00000101000635290663837208410060
    smrtak 22.10.2017 - 21:30:31 level: 1 UP [7K] New
  • 00000101000635290663837208398561 more children: (1)
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    ooo 22.04.2017 - 00:05:07 level: 1 UP [9K] New
    more children: (1)
  • 00000101000635290663837208316355
    RataFuck von Plachta 17.03.2017 - 14:24:21 level: 1 UP [2K] New
    Small Shop Solutions - Projects Plans Tips and Techniques - Mantesh.pdf
    Shop Drawings for Craftsman Furniture 27 Stickley Designs for Every Room in the Home.pdf
    Home Decor Crafting - Mantesh.pdf
    Complete Home Storage.pdf
    101 Essential Tips - Home Brewing (2015).pdf
    101 Essential Tips - Growing Vegetables (2015).pdf
    101 Essential Tips - Baking (2015).pdf
    https://uloz.to/!TD1jHHmE0ASb/tips-and-tricks-zip
    heslo: kybca


    Flicker
    Żubr żuł żuchwą żurawinę
  • 00000101000635290663837208216115
    ooo 17.09.2016 - 11:47:52 level: 1 UP [12K] New
    Jednoduche ohybanie zeleznych prutov (Armovanie pre chudakov)

    Ti co ste robili so zeleznymi vystuzami sa z toho asi budete smiat, ale pre mna bol tento low/tech zlepsovak novinkou:) Robil som betonovy zaklad pre ovocnu pivnicu (pasy, bez deky) a chcel som to trosku vystuzit zelezom. Kedze je zaklad v skale, tak som nepotreboval bohviejake armovanie, ale nejake som tam dat chcel.

    Za 12 eur som si v zeleziarstve kupil noznice na zelezo (mozem kradnut bajky) a ako vystuz som pouzil tenke pruty o priemere 8mm, na strmienky (spoje) zelezo 6mm. To ako som prevazal 6 metrove pruty na streche auta radsej popisovat nebudem:)

    Problem bol s ohybanim zeleza, lebo ohybacka stoji 60 eur, a skrz takyto jednoduchy kos sa mi to zdalo privela. Tak som skusil toto:


    - zobral som zbytok OSB dosky co som nasiel a zospodu som ju vystuzil salovacou doskou (hociake dve dosky posluzia)
    - do dosky som zabil 6 velkych klincov a to tak, ze v prvej rovnobeznej rade boli 2 klince asi 10cm od seba, a v druhej rovnobeznej rade boli 4 klince - dva v mieste kde ohybam zelezo, jeden 20cm od ohybu a jeden 40cm od ohybu (tie rozmery preto lebo som chcel strmienky rozmeru 20x40cm). Obe rovnobezne rady su od seba vzdialene cca 1 centimeter (aby sa medzi ne zmestila tyc ktoru ohybate). Na pochopenie odporucam zvacsit prvu foto.
    - samotne ohybanie sa dialo za pomoci jaklovej tyce dlzky 1 meter, v Pezinku som ju kupil za tusim 1,50 euro.

    Ohybanie funguje tak, ze najprv si odstrihnete vhodne dlhy kus tyce, vlozite ju medzi dve rady klincov tak aby trcalo to co idete ohnut. Nasledne si zahnete jej jeden roh (cca 10cm), nasledne zelezo vyberiete, vovleciete do jaklovej rury, opat vlozite medzi dva rady klincov pricom zahnuty koniec zapriete o klinec vzdialeny 20cm, a ohybate na rozmer 20cm, potom to iste opakujete na 40 cm, potom zas na 20 a potom zas na 40. Nakoniec zahnete aj zbytok dovnutra. Neviem to lepsie popisat, ale nie je to moj vymysel tak sa hadam bude dat najst nejake video k tomu (sam netusim kde som o tom pocul a videl ale spolahol som sa na to ze sa mi to podari a mal som pravdu:)

    par foto (stavbari nesmejte sa:)
    origos fotky sa daju zvacsit

    20160911_160624.jpg


    strmienky s prutmi zviazete pomocou armovacieho drotu, opisat ako robit stabilne zviazanie slovami nedokazem:)
    20160912_170411.jpg
    more children: (2)
  • 00000101000635290663837208216091
    Synapse creator 17.09.2016 - 09:55:25 level: 1 UP [13K] New Hardlink


    Typek si asi povedal, ze sa doma nudi, tak si postavil pec a kompletne DIY metodou zacal odlievat hlinik. Ma kopec videi okolo toho, ako odliat aj fakt zlozite odliatky a prakticky vsetko vybavenie na odlievanie vratane hliny a foriem si vyrobil doma. Tento pan ma teda u mna husty respekt nie len za to, do coho sa pustil a akou metodou sa do toho pustil, ale hlavne za to, akym sposobom to odprezentoval.

    Shitty life is like radiation. You can sustain it for long time if daily doses are small.
    more children: (4)
  • 00000101000635290663837208151005
    smrtak 17.05.2016 - 21:38:24 level: 1 UP New
    6a00e0099229e8883301b7c7e07230970b-500wi

    Wireless internet access is on the rise in both modern consumer societies and in the developing world.

    In rich countries, however, the focus is on always-on connectivity and ever higher access speeds. In poor countries, on the other hand, connectivity is achieved through much more low-tech, often asynchronous networks.

    While the high-tech approach pushes the costs and energy use of the internet higher and higher, the low-tech alternatives result in much cheaper and very energy efficient networks that combine well with renewable power production and are resistant to disruptions.

    If we want the internet to keep working in circumstances where access to energy is more limited, we can learn important lessons from alternative network technologies. Best of all, there's no need to wait for governments or companies to facilitate: we can build our own resilient communication infrastructure if we cooperate with one another. This is demonstrated by several community networks in Europe, of which the largest has more than 35,000 users already.
    http://www.lowtechmagazine.com/2015/10/how-to-build-a-low-tech-internet.html
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    .
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    Phaceo 08.06.2015 - 14:55:48 level: 1 UP [2K] New
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    mister.shadow 20.05.2015 - 12:21:23 level: 1 UP [2K] New
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    Synapse creator 22.02.2015 - 19:30:29 (modif: 19.06.2019 - 18:21:47) level: 1 UP [16K] New Hardlink Content changed
    .
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    smrtak 28.11.2014 - 12:39:56 level: 1 UP [4K] New
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    smrtak 10.09.2014 - 19:33:38 level: 1 UP [31K] New
    Retro-Direct

    dva převody bez přehazovačky aneb pocta důmyslu našich pradědů

    Z mé oblíbené dětské knížky o historii jízdních kol od Kamila Lhotáka jsem měl léta vtisknutý v paměti obrázek jakéhosi nepochopitelného zpřevodování s podivně propleteným řetězem. Společný popisek několika ilustrací pravil "starší systémy měnitelných převodů", bez jakéhokoliv přiblížení funkce. Před pár lety jsem se dostal do muzea cyklistiky ve francouzském Saint-Étienne, kde jsem tajuplný převod uviděl znovu - tentokrát ovšem s vysvětlením a funkční ukázkou - a užasl jsem. Patent se nazývá Retro-Direct a patřil ke specialitě dodávané v prvních desetiletích 20.stol. místním výrobcem kol Hirondelle (Vlašťovka). Kolo má dva převody - těžký když otáčíme klikami dopředu, lehký když otáčíme vzad. V obou případech se kolo samozřejmě pohybuje vpřed. Geniální technická řešení zkrátka spočívají v jednoduchosti.

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    http://matej.boha.cz/retrodirect/#volnobezky
    more children: (5)
  • 00000101000635290663837207691965
    RataFuck von Plachta 03.09.2014 - 20:13:59 level: 1 UP [29K] New
    more children: (11)
  • 00000101000635290663837207557567
    ode 10.04.2014 - 15:56:19 level: 1 UP New
    čafte, nehovorím že to nemôže byť fake, ale rád by som si to overil, pre istotu.

    je tu nejaký nepredpojatý technik, najlepšie vysokoškolsky vzdelaný, ktorý by mi vedel pozreť tieto plány (podrobný nákres a pokec v pdf v linku tam), že či toto môže fungovať?
    http://www.svetkolemnas.info/novinky/zahranicni/939
    more children: (3)
  • 00000101000635290663837207458041
    Synapse creator 12.01.2014 - 22:04:50 level: 1 UP [28K] New Hardlink
    1544322_622638887772428_1625561243_n.jpg
    When Cynthia Koenig, a young social entrepreneur from New York, learned that millions of girls and women around the world spend hours each day collecting water from distant sources, she decided to create a new way to help people in poor communities transport water and it's called the WaterWheel. Koenig's WaterWheel allows people to roll water in a 50-liter container versus carrying it in 5 gallon (19 liter) jugs. Koenig estimates that the WaterWheel can save women 35 hours per week in water transport time, as well as prevent the physical strain that comes from balancing 40 pounds of water on top of their heads for hours each day.

    Every day around the world, over 200 million hours are spent each day fetching water, often from water sources miles from home, and this task usually falls to women and girls. By freeing up valuable time, the WaterWheel allows women to spend time on income-generating activities that can help pull her family out of poverty. The time savings also means that there is a greater likelihood that girls will be allowed to stay in school, further reducing the rate of intergenerational poverty.

    After receiving a $100,000 Grand Challenges Canada prize to develop the WaterWheel, Koenig founded a social enterprise company, Wello. The company is in an early stage of development and has been piloting the WaterWheel in rural communities in India. Koenig also plans on continuing to make the WaterWheel itself more useful by adding in filtration, drip irrigation kits, even a cell phone charger that uses the rotation of the wheel to charge the battery of the cell phone and give people more access to essentials like communication and education.

    To learn more about this invention and its potential to transform the lives of many girls and women around the world, check out Koenig's TED talk at http://bit.ly/1gBdpGt and you can read a recent article in The Guardian about her venture at http://bit.ly/1dMt7Mh.

    To learn more about how to support her work, visit Wello's website at http://wellowater.org/

    For a wonderful book about more female innovators and inventors throughout history, check out “Girls Think of Everything: Stories of Ingenious Inventions by Women” for readers 8 to 13 at http://www.amightygirl.com/girls-think-of-everything

    Or, for younger readers age 4 to 9, we highly recommend the newly released fiction book "Rosie Revere, Engineer" about an budding young engineer at http://www.amightygirl.com/rosie-revere-engineer

    To help children and teens better understand the challenges many children around the world face in order to go to school, check out our blog post, "Honoring Malala: Mighty Girl Books on Children's Fight for Education," showcasing our top books for young readers on children's educational access issues at http://www.amightygirl.com/blog/?p=4057

    A Mighty Girl also has a section highlighting stories that feature poverty and hardship as a significant theme. Such stories provide opportunities for parents to discuss these topics with their children while also helping to foster children's empathy for people living in difficult circumstances. Learn more at http://www.amightygirl.com/books/social-issues/poverty-hardship

    And, if you're looking for ways to encourage your children to become the next engineering and technology innovators, visit A Mighty Girl's STEM toy section at http://www.amightygirl.com/toys/toys-games/science-math
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