Is That True Or Did You Hear It On The BBC?

By Paul Homewood

 

I have just bought this book, which includes some good stuff on the BBC’s climate lies and misinformation.

I have only read the first couple of chapters, but I would thoroughly recommend it:

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https://www.amazon.co.uk/That-True-Did-You-Hear/dp/1999359178/ref=sr_1_1?crid=7X4XWRFCL3XT&keywords=david+sedgwick&qid=1660904207&s=books&sprefix=david+sedgwick%2Cstripbooks%2C64&sr=1-1

This is the Amazon summary:

 

However, as David Sedgwick reveals in his new book the reality is somewhat different: not only does the BBC diligently protect power from scrutiny, it attacks and attempts to discredit those who dare to challenge the status quo.
Formed in 1922 by the British establishment, the BBC has always been a reliable ally of ultra-wealthy and powerful interests. Indeed, the broadcaster occupies a pivotal position within an international corporate-political alliance which promotes only those narratives which consolidate the ‘global order.’
Using multiple examples of BBC reporting, the author argues that the tax-payer funded broadcaster is a proxy which acts on behalf of a tiny, but very powerful clique – a role which compels it to pump out disinformation on an industrial scale, misleading all those who consume its content.

The book includes sections on:

 

  • Climate Change
  • Brexit
  • COVID
  • Trump
  • NHS

Sedgwick’s premise is an interesting one that the BBC has always protected the establishment . One implication from this is that this same establishment has morphed over the years, from a reactionary one of the past to the left wing, big government, global world order one of today.

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August 19, 2022 at 05:27AM

New Evidence Shows Water Separates into Two Different Liquids at Low Temperatures


Peer-Reviewed Publication

UNIVERSITY OF BIRMINGHAM

Fresh evidence that water can change from one form of liquid into another, denser liquid, has been uncovered by researchers at the University of Birmingham and Sapienza Università di Roma.

This ‘phase transition’ in water was first proposed 30 years ago in a study by researchers from Boston University. Because the transition has been predicted to occur at supercooled conditions, however, confirming its existence has been a challenge. That’s because at these low temperatures, water really does not want to be a liquid, instead it wants to rapidly become ice. Because of its hidden status, much is still unknown about this liquid-liquid phase transition, unlike about everyday examples of phase transitions in water between a solid or vapour phase and a liquid phase.

This new evidence, published in Nature Physics, represents a significant step forward in confirming the idea of a liquid-liquid phase transition first proposed in 1992. Francesco Sciortino, now a professor at Sapienza Università di Roma, was a member of the original research team at Boston University and is also a co-author of this paper.

The team has used computer simulations to help explain what features distinguish the two liquids at the microscopic level. They found that the water molecules in the high-density liquid form arrangements that are considered to be “topologically complex”, such as a trefoil knot (think of the molecules arranged in such a way that they resemble a pretzel) or a Hopf link (think of two links in a steel chain). The molecules in the high-density liquid are thus said to be entangled

In contrast, the molecules in the low-density liquid mostly form simple rings, and hence the molecules in the low-density liquid are unentangled.

Andreas Neophytou, a PhD student at the University of Birmingham with Dr Dwaipayan Chakrabarti, is lead author on the paper. He says: “This insight has provided us with a completely fresh take on what is now a 30-year old research problem, and will hopefully be just the beginning.”

The researchers used a colloidal model of water in their simulation, and then two widely used molecular models of water. Colloids are particles that can be a thousand times larger than a single water molecule. By virtue of their relatively bigger size, and hence slower movements, colloids are used to observe and understand physical phenomena that also occur at the much smaller atomic and molecular length scales.

Dr Chakrabarti, a co-author, says: “This colloidal model of water provides a magnifying glass into molecular water, and enables us to unravel the secrets of water concerning the tale of two liquids.”

Professor Sciortino says: “In this work, we propose, for the first time, a view of the liquid-liquid phase transition based on network entanglement ideas. I am sure this work will inspire novel theoretical modelling based on topological concepts.”

The team expect that the model they have devised will pave the way for new experiments that will validate the theory and extend the concept of ‘entangled’ liquids to other liquids such as silicon.

Pablo Debenedetti, a professor of chemical and biological engineering at Princeton University in the US and a world-leading expert in this area of research, remarks: “This beautiful computational work uncovers the topological basis underlying the existence of different liquid phases in the same network-forming substance.” He adds: “In so doing, it substantially enriches and deepens our understanding of a phenomenon that abundant experimental and computational evidence increasingly suggests is central to the physics of that most important of liquids: water.”

Christian Micheletti, a professor at International School for Advanced Studies in Trieste, Italy, whose current research interest lies in understanding the impact of entanglement, especially knots and links, on the static, kinetics and functionality of biopolymers, remarks: “With this single paper, Neophytou et al. made several breakthroughs that will be consequential across diverse scientific areas. First, their elegant and experimentally amenable colloidal model for water opens entirely new perspectives for large-scale studies of liquids. Beyond this, they give very strong evidence that phase transitions that may be elusive to traditional analysis of the local structure of liquids are instead readily picked up by tracking the knots and links in the bond network of the liquid. The idea of searching for such intricacies in the somewhat abstract space of pathways running along transient molecular bonds is a very powerful one, and I expect it will be widely adopted to study complex molecular systems.”

Sciortino adds: “Water, one after the other, reveals its secrets! Dream how beautiful it would be if we could look inside the liquid and observe the dancing of the water molecules, the way they flicker, and the way they exchange partners, restructuring the hydrogen bond network.  The realisation of the colloidal model for water we propose can make this dream come true.”

The research was supported by the Royal Society via International Exchanges Award, which enabled the international collaboration between the researchers in the UK and Italy, the EPSRC Centre for Doctoral Training in Topological Design and the Institute of Advanced Studies at the University of Birmingham, and the Italian Ministero Istruzione Università Ricerca – Progetti di Rilevante Interesse Nazionale.


JOURNAL

Nature Physics

DOI

10.1038/s41567-022-01698-6 

METHOD OF RESEARCH

Computational simulation/modeling

SUBJECT OF RESEARCH

Not applicable

ARTICLE PUBLICATION DATE

11-Aug-2022

From EurekAlert!

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August 19, 2022 at 04:58AM

Friday Open Thread

Friday Open Thread

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August 19, 2022 at 04:06AM

Goldilocks Power: Why Solar Output Plummets During Heatwaves

Goldilocks was evidently the brains behind the ‘engineering’ of wind and solar power, which only operate when conditions are “just right”.

When the weather turns nasty, giant industrial wind turbines simply turn off. When there’s no wind, they produce nothing; when winds hit gale force, they produce nothing.

Solar panels aren’t any more resilient.

A few fluffy clouds give them grief.

Hailstones make short work of them; a blanket of snow and ice cuts their production to nothing, even when the sun is shining.

A hurricane or tornado soon tears them to worthless shreds.

Shredded panels after a storm in Puerto Rico.

 

But, counterintuitively, it’s when solar energy is at its zenith that the output they occasionally produce starts to drop off, very dramatically.

In Australia, summertime temperatures are routinely 35° C and above with heatwaves of 40° C and above, that can last for a week at a stretch. In those conditions, as their owners will sheepishly admit, their output drops off, well below their rated capacity.

In Britain such conditions are rare, so this is probably the first time the owners of solar panels have worked out just how fickle they can be.

Helen Cahill has the story.

Weather ‘too hot’ for solar panels
The Telegraph
Helen Cahill
19 July 2022

The weather was too hot for solar panels on Tuesday as soaring temperatures reduced their efficiency.

As the heatwave pushed the mercury above 40C for the first time ever in Britain, solar output remained well below the levels usually reached at peak times in spring.

Modelling data from the University of Sheffield suggests that solar energy provided an average 2.8 gigawatts of power on Tuesday.

Meanwhile in spring, when the weather is cooler and generation peaks, it typically accounts for 3.3 gigawatts, according to Josh Jackman, researcher at The Eco Experts.

Solar panels become less efficient when temperatures rise above 25C, meaning energy generation drops off, with efficiency decreasing by around 0.35 percentage points for every degree above this level.

Professor Alastair Buckley, of the University of Sheffield, said: “We never see peak output in mid summer.

“The temperature of the actual solar cell depends on a combination of the ambient temperature and the radiative heating from the sun and also cooling from wind. We saw cell temperatures of 70 degrees yesterday on our test system. Normally it would be between 40 degrees and 50 degrees.”

Tim Dixon, analyst at Cornwall Insight, said: “The efficiency of solar panels is impacted by temperature, with high temperatures above 25 degrees negatively impacting on performance. It is likely that the extreme temperatures have impacted total output levels.”

Chris Hewett, chief executive of industry group Solar Energy UK, said the current weather was “good for solar energy generation” but that the heat “brings down the efficiency of the panels slightly”.

Mr Jackman said that solar panels would be performing better in a heatwave than during a spell of cloudy weather despite their limitations at higher temperatures, and that the technology would normally achieve an average efficiency of around 85pc in a year.

“If it was a cloudy day, they would also be suffering. Losing 5pc of efficiency sounds bad but on a cloudy day you can lose anywhere from 25pc to 66pc depending on how cloudy it is.

“So actually it’s better for it to be too hot than for it to be cloudy.

“They are only at maximum efficiency quite rarely. But who among us is ever at maximum efficiency?”
The Telegraph

Then there’s the other end of the weather spectrum …

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August 19, 2022 at 02:31AM