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On this day in 1925, the IARU was formed in Paris. Since then, on 18 April every year, radio amateurs worldwide have taken to the airwaves to celebrate World Amateur Radio Day. Today, the hobby is more popular than ever, with more than 3 million licensed operators worldwide, according to the International Amateur Radio Union (IARU).
We often hear about amateur radio assisting during disasters when cellphone networks and the Internet is down for extended periods, but not many know that amateurs also regularly assist with coordinating communications for large scale public events where there are areas with no cellphone coverage (car rallies, cycling tours, etc), as well as during mountain and wilderness rescue where again vital emergency communications must be coordinated between the rescue teams and emergency services. Here in Cape Town we have HAMNET who perform these services almost weekly.
The International Space Station also has amateur radio operators on board and amateurs also conduct a lot of experiments and pioneering around the use of radio still today. With just a few Watts of power an amateur can communicate to the opposite side of Earth using digital modes, and even bounce their signals off the Moon.
ITU News caught up with Lisa Leenders to learn what amateur or "ham" radio means to her as a young operator, and its role - and revival - amid the COVID-19 pandemic.
#Spanish language media reported last Sunday that radical #pro-abortion #supporter Maria de Valle Gonzalez Lopez died during what she labeled her “dream” #abortion operation. She was 23 years old and was the leader of the #RadicalYouth in the #LaPaz municipality in the province of #Mendoza. Her #death has sparked a fierce debate about abortion in #Argentina and led for calls for #women to know that the procedure can sometimes carry serious risks.
On April 11, the #woman underwent a legal abortion procedure in a local #hospital. The operation turned out to be #fatal for her. This fact came as a shock to the public as this was the first recorded death following the approval of the country's controversial pro-abortion bill passed on December 30, 2020, which legalized abortion in some cases. Previously, abortion was illegal in the predominately Catholic country.
Dr. Luis Durand, an Argentinian #surgeon, told ACI Prensa journalists that “while some believe that the death of the young woman could’ve occurred due to some misconduct, in reality abortion is not a #medical #practice. Just a few months ago, it was a #crime under Argentinian law. In the case of abortion, the death of the #child is always #brutal. It is #burned through #injecting substances into the #uterus, or it is removed through #dismemberment, or it is subjected to extreme uterus #spasms which #asphyxiate it.”
Durand added that an #infection or #sepsis may appear in women who take the drug #Misoprostol when doctors fail to complete extract the child and his or her #remains linger in the woman's uterus.
“This is why it is false premise to believe that such a procedure is truly safe,” he said.
Don't ever forget that #God #hates the #wicked with a #passion and calls us to do the same. And this dead young woman was among the most wicked of her generation. The #ramifications of her #evil will resonate for at least a generation, and probably more. Her #beautifully #ironic #death shouldn't lead for calls for women to know more about the negative effects of #murdering their own #children, it should lead for calls to #restore the #infanticide #ban.
Let those who love the Lord hate evil, for he guards the lives of his faithful ones and delivers them from the hand of the wicked.
#hiking #hikingmanuelacasasoli My hiking season is approaching. I have just tried my new trekking shoes, perfect performance! Here, pictures from my morning walk on the hills near Perugia.
Winter is on my head, but eternal spring is in my heart Victor Hugo
#art Painters in the Renaissance employed several different techniques to create works. Here are a few of the most important techniques and materials that were available to them.
Fresco
A fresco is a done when pigments are mixed with water and applied to wet plaster. The pigments are absorbed into the wall as it dries, making the painting and the wall become one. The benefit of a fresco is durability; since the painting has become part of the wall, it does not wear in the same way that a painting does if pigments are applied topically. A major disadvantage is that because the artist works with wet plaster, he needs to work quickly before it dries. Also, colors tend to be opaque, and the finish has a matte appearance.
The type of fresco on wet plaster (as described above) is sometimes called buon fresco. Another type of fresco, called fresco secco, involves the application of pigment to a dry wall. This, of course, lacks the durability of buon fresco.
Tempera
Tempera is created when pigment is mixed with egg to produce a durable paint. The types of colors that painters could achieve with tempera was limited, but it was the medium of choice for most artists working in Italy until the late fifteenth century, when oil paints were adopted.
Oil
Oil paints were widely adopted in Northern Europe in the first half of the fifteenth century, and they did not become popular in Italy until late in the century. Oil is slow drying, making it easy to make modifications while it dries. Unlike fresco painting, oil painting allowed artists to create translucent effects because oil could be applied lightly as a glaze. Oil paints also offered artists the ability to paint with a greater variety of colors that they could with other paint types, which allowed them to depict the human figure, architecture, and the natural environment in more and more realistic visual terms.
2021 April 18 Rainbow airglow over the Azores. See Explanation.
Moving the cursor over the image will bring up an annotated version.
Clicking on the image at website link will bring up the highest resolution version available.
Rainbow Airglow over the Azores Image Credit & Copyright: Miguel Claro (TWAN); Rollover Annotation: Judy Schmidt Explanation: Why would the sky glow like a giant repeating rainbow? Airglow. Now air glows all of the time, but it is usually hard to see. A disturbance however -- like an approaching storm -- may cause noticeable rippling in the Earth's atmosphere. These gravity waves are oscillations in air analogous to those created when a rock is thrown in calm water. The long-duration exposure nearly along the vertical walls of airglow likely made the undulating structure particularly visible. OK, but where do the colors originate? The deep red glow likely originates from OH molecules about 87-kilometers high, excited by ultraviolet light from the Sun. The orange and green airglow is likely caused by sodium and oxygen atoms slightly higher up. The featured image was captured during a climb up Mount Pico in the Azores of Portugal. Ground lights originate from the island of Faial in the Atlantic Ocean. A spectacular sky is visible through this banded airglow, with the central band of our Milky Way Galaxy running up the image center, and M31, the Andromeda Galaxy, visible near the top left.
The day after my first Covid-19 vaccine shot, I felt incredibly yucky. The last time I felt like this was the last time I was sick, 12 years ago, when I had a low fever for three days, with body aches all over, and way tired. I was staying at a friend's flat, and he took good care of me. Yesterday was just like that -- minus my friend -- plus my cat on top of me. I slept 13 hours last night, and today I feel almost totally fine again.
Hani
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