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Assorted human interest posts.
June 19, 2022
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June 19, 2022
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A virtual guide to Swaziland, the small landlocked kingdom in southern Africa is bordered by South Africa and Mozambique.
The country covers an area of 17,364 km², it is one of Africa’s smallest countries, slightly larger than half the size of Belgium, or slightly smaller than the U.S. state of New Jersey.
The country is known for its game reserves, the Mlawula Nature Reserve, and the Hlane Royal National Park with diverse wildlife including lions, hippos, and elephants.
Swaziland has a population of 1.4 million people (est. 2015), national capitals are Mbabane and Lobamba.
Autonomy for the Swazis of southern Africa was guaranteed by the British in the late 19th century; independence was granted 1968.
Student and labor unrest during the 1990s have pressured the monarchy (one of the oldest on the continent) to grudgingly allow political reform and greater democracy. Nationsonline.org
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An image from Swaziland Capital City
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June 19, 2022
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For over a decade, scientists have attempted to synthesize a new form of carbon called graphene with limited success. That endeavor is now at an end, though, thanks to new research from the University of Colorado Boulder. Graphyne has long been of interest to scientists because of its similarities to the “wonder material” graphene—another form of carbon that is highly valued by industry whose research was even awarded the Nobel Prize in Physics in 2010. However, despite decades of work and theorizing, only a few fragments have ever been created before now.
This research, announced last week in Nature Synthesis, fills a long-standing gap in carbon material science, potentially opening brand-new possibilities for electronics, optics, and semiconducting material research.
“The whole audience, the whole field, is really excited that this long-standing problem, or this imaginary material, is finally getting realized,” said Yiming Hu, lead author on the paper and 2022 doctoral graduate in chemistry.
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The crystal structure of a layer of graphyne. Credit: Yiming Hu
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June 19, 2022
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General relativity and quantum mechanics are the two most successful conceptual breakthroughs of modern physics, but Einstein’s description of gravity as a curvature in space-time doesn’t easily mesh with a universe made up of quantum wavefunctions. Recent work that tries to bring those theories together is revealing some mind-bending truths. In this episode, the physicist and author Sean Carroll talks with host Steven Strogatz about how space and time might be emergent properties of quantum reality, not fundamental parts of it.
Listen on Apple Podcasts, Spotify, Google Podcasts, Stitcher, TuneIn, or your favorite podcasting app, or you can stream it from Quanta.
Transcript
Steven Strogatz (00:03): I’m Steve Strogatz, and this is The Joy of Why, a podcast from Quanta Magazine that takes you into some of the biggest unanswered questions in science and math today. In this episode, we’re going to be discussing the mysteries of space and time, and gravity, too. What’s so mysterious about them?
Well, it turns out they get really weird when we look at them at their deepest levels, at a super subatomic scale, where the quantum nature of gravity starts to kick in and become crucial. Of course, none of us have any direct experience with space and time and gravity at this unbelievably small scale. Up here, at the scale of everyday life, space and time seem perfectly smooth and continuous. And gravity is very well described by Isaac Newton’s classic theory, a theory that’s been around for over 300 years now.
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Michael Driver for Quanta Magazine
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June 19, 2022
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June 18, 2022
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Loch is the Scottish Gaelic, Scots, and Irish word for a lake or sea inlet. It is cognate with the Manx lough, Cornish logh, and one of the Welsh words for lake, llwch.
In English English and Hiberno-English, the anglicized spelling lough is commonly found in place-names; in Lowland Scots and Scottish English, the spelling “loch” is always used. Many loughs are connected to stories of lake bursts, signifying their mythical origin.
Sea-inlet lochs are often called sea lochs or sea loughs. Some such bodies of water could also be called firths, fjords, estuaries, straits or bays.
This name for a body of water is Insular Celtic in origin and is applied to most lakes in Scotland and to many sea inlets in the west and north of Scotland. The word comes from Proto-Indo-European *lókus (“lake, pool”) and is related to Latin lacus (“lake, pond”) and English lay (“lake”).
Lowland Scots orthography, like Scottish Gaelic, Welsh, and Irish, represents /x/ with ch, so the word was borrowed with identical spelling.
English borrowed the word separately from a number of loughs in the previous Cumbric language areas of Northumbria and Cumbria. Earlier forms of English included the sound /x/ as gh (compare Scots bricht with English bright). However, by the time Scotland and England joined under a single parliament, English had lost the /x/ sound. This form was therefore used when the English settled Ireland. The Scots convention of using ch remained, hence the modern Scottish English loch.
In Welsh, what corresponds to lo is lu in Old Welsh and llw in Middle Welsh such as in today’s Welsh placenames Llanllwchaiarn, Llwchwr, Llyn Cwm Llwch, Amlwch, Maesllwch, the Goidelic lo being taken into Scottish Gaelic by the gradual replacement of much Brittonic orthography with Goidelic orthography in Scotland.
Many of the loughs in Northern England have also previously been called “meres” (a Northern English dialect word for “lake” and an archaic Standard English word meaning “a lake that is broad in relation to its depth”) such as the Black Lough in Northumberland.[2] However, reference to the latter as loughs (lower case initial), rather than as lakes, inlets, and so on, is unusual.
Some lochs in Southern Scotland have a Brythonic rather than Goidelic etymology, such as Loch Ryan where the Gaelic loch has replaced a Cumbric equivalent of Welsh llwch. The same is perhaps the case for water bodies in Northern England named with ‘Low’ or ‘Lough’ or otherwise, it represents a borrowing of the Brythonic word into the Northumbrian dialect of Old English.
Although there is no strict size definition, a small loch is often known as a lochan (so spelled also in Scottish Gaelic; in Irish it is spelled lochán).
Perhaps the most famous Scottish loch is Loch Ness, although there are other large examples such as Loch Awe, Loch Lomond, and Loch Tay.
Examples of sea lochs in Scotland include Loch Long, Loch Fyne, Loch Linnhe, and Loch Eriboll. Elsewhere in Britain, places like the Afon Dyfi can be considered sea lochs. Wikipedia
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An image from Loch Images
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June 18, 2022
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Classical physics did not need any disclaimers. The kind of physics that was born with Isaac Newton and ruled until the early 1900s seemed pretty straightforward: Matter was like little billiard balls. It accelerated or decelerated when exposed to forces. None of this needed any special interpretations attached. The details could get messy, but there was nothing weird about it.
Then came quantum mechanics, and everything got weird really fast.
Quantum mechanics is the physics of atomic-scale phenomena, and it is the most successful theory we have ever developed. So why are there a thousand competing interpretations of the theory? Why does quantum mechanics need an interpretation at all?
What, fundamentally, is it trying to tell us?
Affairs of state
There are many weirdnesses in quantum physics — many ways it differs from the classical worldview of perfectly knowable particles with perfectly describable properties. The weirdness you focus on will tend to be the one that shapes your favorite interpretation.
But the weirdness that has stood out most, the one that has shaped the most interpretations, is the nature of “superpositions” and of measurement in quantum mechanics.
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Credit: Lucid Pixel / Adobe Stock
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June 18, 2022
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Hydrogen could be an important part of our future energy supply: It can be stored, transported, and burned as needed. However, most of the hydrogen available today is a by-product of natural gas production, and this has to change for climate protection reasons. The best strategy so far to produce environmentally friendly “green hydrogen” is to split water into hydrogen and oxygen using electricity that comes from renewable energy sources, for example, photovoltaic cells.
However, it would be much easier if sunlight could be used directly to split water. This is exactly what new catalysts are now making possible, in a process called “photocatalytic water splitting.” The concept is not yet used industrially. At TU Wien, important steps have now been taken in this direction: on an atomic scale, scientists have realized a new combination of molecular and solid-state catalysts that can do the job while using relatively inexpensive materials.
Interaction of atoms
“Actually, to be able to split water with light you have to solve two tasks at the same time,” says Alexey Cherevan from the Institute for Materials Chemistry at TU Wien. “We have to think about oxygen and about hydrogen. The oxygen atoms of the water must be transformed into O2 molecules, and the remaining hydrogen ions—which are just protons—must be turned into H2 molecules.”
Solutions have now been found for both tasks. Tiny inorganic clusters consisting of only a small number of atoms are anchored on a surface of light-absorbing support structures such as titanium oxide. The combination of clusters and carefully chosen semiconductor supports lead to the desired behavior.
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Structural models of two clusters that enable water splitting into O2 and H2 by means of light energy. Credit: Vienna University of Technology
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June 18, 2022
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June 17, 2022
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Shenzhen, also historically known as Sham Chun, is a major sub-provincial city and one of the special economic zones of China. The city is located on the east bank of the Pearl River estuary on the central coast of southern province of Guangdong, bordering Hong Kong to the south, Dongguan to the north, and Huizhou to the northeast. With a population of 17.56 million as of 2020, Shenzhen is the fourth most populous city proper in China. Shenzhen is a global center in technology, research, manufacturing, business and economics, finance, tourism, and transportation, and the Port of Shenzhen is the world’s fourth busiest container port.
Shenzhen roughly follows the administrative boundaries of Bao’an County, which was established since imperial times. The southern portion of Bao’an County was seized by the British after the Opium Wars and became Hong Kong, while the village of Shenzhen was situated on the border. Due to the completion of a train station that was the last stop on the Mainland Chinese section of the railway between Guangzhou and Kowloon, Shenzhen’s economy grew and became a market town and later a city by 1979, absorbing Bao’an County for the next decade.
In the early 1980s, economic reforms introduced by Deng Xiaoping resulted in the city becoming the first special economic zone of China due to its close proximity to Hong Kong, attracting foreign direct investment and migrants searching for opportunities. In thirty years, the city’s economy and population boomed and has since emerged as a hub for technology, international trade, and finance. It is the home to the Shenzhen Stock Exchange, one of the largest stock exchanges in the world by market capitalization, and the Guangdong Free-Trade Zone. Shenzhen is ranked as an Alpha- (global first-tier) city by the Globalization and World Cities Research Network. Its nominal GDP has surpassed neighboring cities of Guangzhou and Hong Kong and is now among the top ten cities with the largest economies in the world. Shenzhen also has the eighth-most competitive and largest financial center in the world, fifth-highest number of billionaires of any city in the world, the second-largest number of skyscrapers of any city in the world, the 28th largest scientific research output of any city in the world, and several notable educational institutions, such as Shenzhen University, Southern University of Science and Technology, and Shenzhen Technology University.
Due to the city being a leading global technology hub, Shenzhen has been dubbed by media China’s Silicon Valley. The city’s entrepreneurial, innovative, and competitive-based culture has resulted in the city being home to numerous small-time manufacturers or software companies. Several of these firms became large technology corporations such as phone manufacturer Huawei, holding company Tencent, and drone-maker DJI. As an important international city, Shenzhen hosts numerous national and international events every year, such as the 2011 Summer Universiade and the China Hi-Tech Fair. Shenzhen’s rapid success has resulted in the Chinese government turning Shenzhen into a model city for other cities in China and the world to follow. Wikipedia
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An image from Shenzhen, China
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