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positive_tech_and_science·Positive Tech & SciencebyCanaconda

Physics predicts at most 33% of the energy hitting a solar panel can be converted into electricity. But, simulations at University of Groningen in the Netherlands revealed a way to break this barrier

Physics predicts that no more than 33% of the solar energy that falls on a solar panel can be converted into electricity. However, experiments and simulations by scientists at the University of Groningen in the Netherlands revealed a way to harvest extra energy from "hot electrons," which could break this barrier.

Physics predicts at most 33% of the energy hitting a solar panel can be converted into electricity. But, simulations at University of Groningen in the Netherlands revealed a way to break this barrierhttps://techxplore.com/news/2026-09-harvesting-hot-electrons-solar-panel.htmlOpen linkView original on lemmy.ca
25
fuck_ai·Fuck AIbyCanaconda

(June 2024) AI Drive Thru's Failed But The Rollout Continued

McDonald's is removing artificial intelligence (AI) powered ordering technology from its drive-through restaurants in the US, after customers shared its comical mishaps online.

A trial of the system, which was developed by IBM and uses voice recognition software to process orders, was announced in 2019.

It has not proved entirely reliable, however, resulting in viral videos of bizarre misinterpreted orders ranging from bacon-topped ice cream to hundreds of dollars' worth of chicken nuggets.

McDonald's told franchisees it would remove the tech from the more than 100 restaurants it has been testing it in by the end of July, as first reported by trade publication Restaurant Business.

View original on lemmy.ca
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electricvehicles·Electric VehiclesbyCanaconda

MIT Study shows EV's reduce lifetime emissions by 40-60% after factoring in everything including mining and efficiency loss.

Determinants of electric vehicle emissions savings and costs across locations and individuals Marco Miotti and Jessika E Trancik*

Following is in video description by @MoneyShift

The most common argument against electric cars is that once you factor in battery manufacturing and lithium mining, they aren't actually cleaner. MIT tested that directly, and the answer is no longer ambiguous.

Researchers Marco Miotti and Jessika Trancik built a lifecycle model covering thousands of US zip codes, drilling down to individual driver behavior rather than comparing broad regions. They accounted for battery and vehicle manufacturing, fuel extraction and refining, regional electricity mix, local meteorological data, traffic density, trip length and duration, acceleration patterns, gas and electricity prices, and state fees. The study appears in Environmental Research Letters.

The concession first: building a battery is dirtier than building a comparable gas car, and an EV starts life with a larger manufacturing footprint. MIT states that plainly rather than working around it.

The findings: in most US locations, a battery electric vehicle reduces lifetime greenhouse gas emissions by 40 to 60 percent compared to a similar gas vehicle, with larger reductions in urban areas. On cold weather, MIT found that in a climate like North Dakota, efficiency can drop as much as 50 percent on a particularly frigid night, but the effect on annual emissions benefits is minimal. Miotti's own conclusion was that even in the most unfavorable conditions, EVs still reduce emissions substantially.

On cost, EVs are competitive with comparable combustion vehicles in lifetime ownership cost across most of the country, even without clean vehicle tax credits. Where electricity is relatively affordable, battery electrics tend to cost less outright. The study also found that individual driving behavior matters roughly as much as regional electricity mix, with the biggest reductions going to people who drive more, drive larger vehicles, and spend more time in traffic.

MIT also updated their public tool at carboncounter.com, where you can compare lifecycle emissions and ownership costs for nearly any car on the market.

None of this means you have to like electric cars. Dislike the steering feel. Dislike the brake feel. Want a manual. Those are real objections. The emissions one is finished.

Car news the way Doug DeMuro, Jason Cammisa and Chris Harris cover cars, every day

View original on lemmy.ca
587
balconygardening·Balcony GardeningbyCanaconda

My Results Using Various Alternative Methods In My First 3 Years Gardening.

I'm in my 3rd year gardening from my balcony and living room. Here's a quick overview of my experiences to help newbie apartment gardeners navigate the many options available.

Note: I am comparing my results with other 'traditional' gardeners' who I share seeds with. So I've seen how more soil directly translates to larger growth.

Here's a link to another thread where people already gave me some valuable feedback and advice. https://lemmy.ca/post/69259614

Soil Based

  1. Grow Bags

I find these to only be good for sweet potatoesm flowers and herbs. You have to fill them too full for larger plants which causes the bags to bulge. I tried Tomatoes/Zuccini but both got blossom end rot and didn't produce viable fruit.

Main issue is not enough soil for plants to grow their roots out.

  1. Hanging Plastic Bottles.

So I tried these with a dwarf bell pepper variety and the fruit were smaller than the ones that got planted in the ground. I also had significant problems getting the right amount of drainage leading to blossom end rot.

I never tried the "upside down" versions with the plants growing downward as that is counter to the plant biology of most plants.

Overall I would only recommend this if you have zero space and zero access to alternatives. Could be more viable for herbs, strawberries, and climbing plants.

  1. Wall Planters

So I only tried these this year and I made several mistakes. First off, I put it in an area with too much sun. Second, I direct seeded my greens into it because I didn't want to do any more seedlings this year. 3rd, I did not water it 'correctly'. Because of the small soil space, the sun expose, and my climate it require red more frequent small waterings. Everything that sprouted either dried up or drowned.

Next year I will start them as seedlings and transplant them, use dripping irrigation or some other form of water management.

  1. Railing Planters

So these are pretty consistent, their main limiting factor is of course shallow soil. Great for herbs and flowers, strawberries are okay. Grew a sunflower out of one but it was much smaller than the others.

Definitely a good place to start. Just make sure they have drainage holes.

Hydroponic Based

  1. Tower Garden

So these are legit, but they're also over priced. This was my first hydroponic grow system and while it worked well for some things, the "one size fits all" has it's limitations.

The main strength of these are the vertical aspect and the aeration. Which I will discuss more in other methods.

  1. KRATKY

So KRATKY is essentially growing in water with nutrients. The biggest drawback is there is no aeration. As such you need to refill only to 2/3 leaving 1/3 of the roots above water to absorb oxygen from the air.

Size of container limits root potential and thus overall plant growth. I've used 5gal jugs and gotten much larger plants simply from the size increase.

I do NOT recommend the coloured pots in the picture. They are too small. Might be viable for non-edible plants but for anything you wanna eat the smaller harvest is a drawback.

  1. Aero-Garden / iDoo / ETC

So I highly recommend these type of systems in general. They have drawbacks and can be overpriced but they are easy to use and produce. They all have water circulation pumps that provide aeration, so you can fill them fuller and you get much larger harvests. This is the primary advantage over KRATKY. I highly recommend adding an air stone to any existing KRATKY to massively improve growth.

Downsides are they tend to be smaller so roots can only grow so big. They also tend to use switches whose timer resets when it loses power, so you have to turn them on at the correct time for them to turn off when you want them to.

  1. Aquaponic w/ Aquarium

So this is by far the most complicated option. BUT fish water is amazing garden fertilizer, so it's a viable part of any growing system.

Main consideration is tropical fish want warm water that doesn't hold oxygen, meaning you need airstones and will always have stunted growth.

Secondary is algae, which grows from light entering the aquarium. The challenge is getting light on your plants while minimizing the light hitting the water.

I've done strawberries, sweet potatoes, and spider plants. I would suggest going with non-edible plants like the spider plant or pothos.

View original on lemmy.ca
19
gardening·GardeningbyCanaconda

Apartment Gardening: My Results With Various Alternate Growing Methods

I'm in my 3rd year gardening from my balcony and living room. Here's a quick overview of my experiences to help newbie apartment gardeners navigate the many options available.

Note: I am comparing my results with other 'traditional' gardeners' who I share seeds with. So I've seen how more soil directly translates to larger growth.

Soil Based

  1. Grow Bags

I find these to only be good for sweet potatoesm flowers and herbs. You have to fill them too full for larger plants which causes the bags to bulge. I tried Tomatoes/Zuccini but both got blossom end rot and didn't produce viable fruit.

Main issue is not enough soil for plants to grow their roots out.

  1. Hanging Plastic Bottles.

So I tried these with a dwarf bell pepper variety and the fruit were smaller than the ones that got planted in the ground. I also had significant problems getting the right amount of drainage leading to blossom end rot.

I never tried the "upside down" versions with the plants growing downward as that is counter to the plant biology of most plants.

Overall I would only recommend this if you have zero space and zero access to alternatives. Could be more viable for herbs, strawberries, and climbing plants.

  1. Wall Planters

So I only tried these this year and I made several mistakes. First off, I put it in an area with too much sun. Second, I direct seeded my greens into it because I didn't want to do any more seedlings this year. 3rd, I did not water it 'correctly'. Because of the small soil space, the sun expose, and my climate it require red more frequent small waterings. Everything that sprouted either dried up or drowned.

Next year I will start them as seedlings and transplant them, use dripping irrigation or some other form of water management.

  1. Railing Planters

So these are pretty consistent, their main limiting factor is of course shallow soil. Great for herbs and flowers, strawberries are okay. Grew a sunflower out of one but it was much smaller than the others.

Definitely a good place to start. Just make sure they have drainage holes.

Hydroponic Based

  1. Tower Garden

So these are legit, but they're also over priced. This was my first hydroponic grow system and while it worked well for some things, the "one size fits all" has it's limitations.

The main strength of these are the vertical aspect and the aeration. Which I will discuss more in other methods.

  1. KRATKY

So KRATKY is essentially growing in water with nutrients. The biggest drawback is there is no aeration. As such you need to refill only to 2/3 leaving 1/3 of the roots above water to absorb oxygen from the air.

Size of container limits root potential and thus overall plant growth. I've used 5gal jugs and gotten much larger plants simply from the size increase.

I do NOT recommend the coloured pots in the picture. They are too small. Might be viable for non-edible plants but for anything you wanna eat the smaller harvest is a drawback.

  1. Aero-Garden / iDoo / ETC

So I highly recommend these type of systems in general. They have drawbacks and can be overpriced but they are easy to use and produce. They all have water circulation pumps that provide aeration, so you can fill them fuller and you get much larger harvests. This is the primary advantage over KRATKY. I highly recommend adding an air stone to any existing KRATKY to massively improve growth.

Downsides are they tend to be smaller so roots can only grow so big. They also tend to use switches whose timer resets when it loses power, so you have to turn them on at the correct time for them to turn off when you want them to.

  1. Aquaponic w/ Aquarium

So this is by far the most complicated option. BUT fish water is amazing garden fertilizer, so it's a viable part of any growing system.

Main consideration is tropical fish want warm water that doesn't hold oxygen, meaning you need airstones and will always have stunted growth.

Secondary is algae, which grows from light entering the aquarium. The challenge is getting light on your plants while minimizing the light hitting the water.

I've done strawberries, sweet potatoes, and spider plants. I would suggest going with non-edible plants like the spider plant or pothos.

View original on lemmy.ca
41
privacy·PrivacybyCanaconda

Request: Suggestions for 'dumb' outlet meters and mechanical timer alternatives

Yea so I have some aquariums / hydroponics that I'd like to measure the energy use as well as control individually with timers. Probably looking for a combination power bar with a wall outlet meter.

I see lots of power bars that have 1 timer for 4 outlets, but none that let me control outlets individually.

Meanwhile all the outlet meters I'm seeing have apps and give me spyware vibes.

Not categorically against "smart" stuff, but I'm hesitant to use anything with wifi connectivity that isn't "privacy community approved."

I already have mechanical timers Looking for upgrade suggestions.

View original on lemmy.ca
electricvehicles·Electric VehiclesbyCanaconda

Anyone Familiar with "Go Sun"? It's a portable solar charger for cars.

https://gosun.co/

Basically its a roof rack solar panel with a battery inside (includes AC outlet), extra fold out panels that cover the length of the car, and a charge cable for the car. They're about $5000 USD and are shipping the first ones out in Q3 this year.

As someone who lives in an appt and commutes, this would make an electric vehicle much more viable as there is no charging stations in my building or at my work. I saw this and immediately began researching what vehicle models would be coming to Canada in 2028.

View original on lemmy.ca
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