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Is the shallow pool in Paris really slowing Olympic swimmers down? Here’s what the science says

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Is the shallow pool in Paris really slowing Olympic swimmers down? Here’s what the science says


swimming pool
Credit: Unsplash/CC0 Public Domain

There has been plenty of rain, sweat and tears shed at the Paris Olympics this week. But the pool at the heart of La Defénce Arena has suffered a drought of world records that has athletes and officials scratching their heads.

After five days, Paris 2024 has seen only a single world record fall in a swimming event. That compares with six new swimming world records set at Tokyo in 2021 and eight at Rio in 2018. Even the much-hyped women’s 400 meter freestyle—billed as the “race of the century“—failed to topple any personal bests from the three most recent world-record holders, Ariarne Titmus (Australia), Summer McIntosh (Canada) and Katie Ledecky (United States).

To earn a spot on the winners’ podium, of course, place—not pace—is what matters. But the near-absence of the letters WR alongside any of the finishing times on the Olympic scoreboard has coaches, competitors and commentators searching for a culprit.

Several athletes, including Titmus, have pointed to problems with the accommodation, food and transport at the games. And some are pointing to the Olympic pool itself with cries of “J’accuse…!”

The slow pool theory

It is undeniable that the pool at La Défence Arena is shallower than at recent Olympics. It’s 2.15m deep—deeper than the required minimum of 2m but quite a bit shallower than the standard 3m used at the Tokyo and Rio games.

Why would this make a difference? Well, when swimmers dive into the pool and power through the water, they naturally create waves that radiate outwards. Some of these waves will propagate along the surface of the pool and be damped by gutters at the edge. Others will travel downward, bounce off the bottom of the pool, and return to the surface to create turbulence.

Turbulence can slow a swimmer down in two ways. First, it creates a choppy pool surface that can disrupt a swimmer’s rhythm and reduce their speed.

Second, turbulence increases the effect of water drag by dissipating the swimmer’s momentum—the water motion literally “sucks” the speed from the swimmer.

The slow pool theory says the shallower pool means more waves bounce back to the surface, creating more turbulence and slowing swimmers down. But does it hold water?

Not according to Roberto Colletto, chief executive of the Italian company that constructed the pool in Paris. “On the technical side, there is no problem with the pool,” he told French broadcaster RMC Sport.

And scientifically speaking, the theory has some holes. One problem is that the waves bouncing off the pool bottom are quite different from the ones that travel across the surface. Subsurface waves are essentially sound waves generated by differences in water pressure.

Sound waves travel at about 1,500m per second in water. In a 2.15m-deep pool, a sound wave takes a little under 3 milliseconds to bounce off the bottom and return to the surface, compared with 4 milliseconds in a 3m pool. This millisecond difference in travel time likely has a negligible effect on the generation of turbulence at the pool surface.

On the surface

Water depth does have an effect on the waves at the pool surface, however. Surface waves travel more slowly in shallow water—which is why you see ocean waves piling up and breaking as they approach the beach.

So the waves the swimmers are creating at the surface of the competition pool in Paris will be traveling marginally more slowly than the waves in a 3m-deep pool.

Elite swimmers can take advantage of the surface waves they generate in the pool. By adjusting their swimming speed, they can create a wave that has a wavelength close to their own body length. This means the swimmer can position themselves between two crests to effectively “surf” the wave.

This critical speed, known as “hull velocity“, is well known in sailing. For elite middle- and long-distance swimmers, swimming at their own personal hull velocity can save energy—and win races.

Because the competition pool at the Paris Olympics is shallower than a standard 3m pool, the hull velocity of each swimmer will be slightly slower. So it is possible that some of the swimmers—especially in middle-distance races such as the 400m freestyle—may unconsciously be adjusting their pace to match the slower hull velocity. But, since the effect is the same for all competitors, no one will have an unfair advantage.

That’s only one possible explanation for the dreaded “slow pool”. It’s also possible that the perception of a slow pool has a larger effect than the reality.

As some have pointed out, the Australian Olympic Trials at the Brisbane Aquatic Center resulted in a new world record in the women’s 200m freestyle—despite the pool being only 2m deep.

Faster, higher, stronger

It’s also possible swimmers are approaching the limits of human performance—at least until we work out how to break those limits once again.

New technology, improved nutrition and training, and greater access to clubs and coaches have boosted elite performance. But each toppled record reduces the likelihood of another, even better performance.

It shouldn’t be surprising that the rate of record-breaking performances will decrease over time.

In marathon running, for example, the men’s world record fell by 12 minutes over the 1950s and ’60s. But further progress has been slow: it has only dropped another 8 minutes in the past 60 years, and now stubbornly hovers just above the two-hour mark. A statistical study published in 2019 predicted there is only a 1 in 4 chance anyone would beat the two-hour threshold in a competitive event by 2027.

Compared to track events, swimming seems to still have plenty of capacity to shatter records.

At Tokyo in 2021, the winning times in three-quarters of the swimming events were faster than at the Beijing Games in 2008. This was despite the use of swimming suits in the Beijing games that were later banned by the sport’s governing body. Over the past decade, swimming world records have been broken 43% more often than in Olympic track races.

The desire to push our limits, to break the unbreakable barrier, is at the heart of the Olympic motto: “Faster, higher, stronger.”

It just might take a little longer to get there.

Provided by
The Conversation


This article is republished from The Conversation under a Creative Commons license. Read the original article.The Conversation

Citation:
Is the shallow pool in Paris really slowing Olympic swimmers down? Here’s what the science says (2024, August 1)
retrieved 1 August 2024
from https://phys.org/news/2024-08-shallow-pool-paris-olympic-swimmers.html

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Artificial intelligence is taking the consulting industry by storm—should we be concerned?

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Artificial intelligence is taking the consulting industry by storm—should we be concerned?


consulting
Credit: cottonbro studio from Pexels

Artificial intelligence (AI) is enjoying a long moment in the spotlight. But debate continues over whether it’s a “shortcut to utopia” or possible harbinger of the end of the world.

Meanwhile, one group has quickly leapt on both the technology and all the hype—consulting firms. And they’ve been spending big.

Advocates of the technology are heralding a new era of professional efficiency for consultants. Once-tedious emails, presentations and reports can now be completed in a flash.

Many consulting firms have also already leapt at the opportunity to professionally advise other businesses on making the most of new generative AI tools.

So why does the consulting industry see such potential for transformation—and is hurling itself headfirst at this technology a good idea?

Wait, what do consultants do?

The consulting industry is notoriously shrouded in mystique, despite regularly winning huge contracts from governments and major businesses.

But in simple terms, consultants aim to offer their clients expert advice and solutions to help improve their performance, solve problems and achieve certain goals.

They often possess specialized knowledge, skills or experience relevant to a particular client, so the nature of their work can vary significantly.

Clients often seek consulting services because they want help with problem-solving and decision-making on a particular project, or want external validation for their decisions and need an independent report.

A wide range of professional services firms offer consulting services, including the “big four”: Deloitte, PricewaterhouseCoopers (PwC), Ernst & Young (EY) and KPMG.

There are also many specialist consulting firms, including McKinsey, Bain & Company, Boston Consulting Group, Kearney and L.E.K. Consulting.

Much of the demand for consultancy services is driven by the increasing complexity of doing business, due to globalization, digitalization, changing regulations and many other factors.

However, growth in Australia’s consulting sector has slowed this year amid the fallout from the PwC tax leaks scandal and sluggish economic growth.

How can AI help?

Artificial intelligence (AI) technology has been around in a range of forms for a while now. But until recently, it was mainly used internally by organizations and required specific training. This changed with the public launch of “generative AI” models, such as OpenAI’s ChatGPT.

These models differ from traditional AI in their capability to generate something new, such as text that is virtually indistinguishable from one written by human, or other types of output such as images, videos or sounds.

Large language models like ChatGPT were some of the first to give the general public a sense of what AI could be used for.

But this has had some specific implications for consulting businesses. The models can analyze large amounts of data quickly and cheaply to generate tailored feedback.

With generative AI offering such efficient services for business analysis and strategic planning, many would-be clients might now be questioning whether buying consulting services will remain worthwhile in the long run—particularly as these technologies improve.

Getting ahead of the curve

It should therefore come as no surprise that the consulting industry is investing heavily in generative AI. Just take the big four, for example.

Deloitte and EY have already deployed conversational AI assistants aimed at boosting staff productivity.

KPMG’s customized version of ChatGPT—KymChat—was launched in March to speed up the preparation of sales proposals for consulting work, by quickly identifying relevant experts.

In May, PwC became OpenAI’s biggest enterprise customer after purchasing more than 100,000 licenses for the AI giant’s latest models.

Other players operating in the knowledge work space have also been hyping up the productivity-boosting potential of generative AI for similar tasks.

US finance behemoth JPMorgan Chase recently rolled out its own large language model called LLM Suite, which it says can “do the work of a research analyst”.

What does this mean for the business model?

To harness this technology’s potential, firms will need to use it effectively. This means ensuring they maintain a human-centered value proposition for clients that goes above what the technology alone can offer.

Generative AI tools will not replace the human trust that is often crucial for successful consulting, nor provide the depth of specialized knowledge (and access to relevant human experts) that a seasoned consultant currently can.

But the technology will streamline a lot of everyday tasks. It can also provide a sounding board for decisions and business strategies, and suggest solutions.

At least in the near term, firms are likely to use AI to “augment” human consultants, rather than replace them.

What are the risks?

The uptake of generative AI also presents risks to the consultancy business.

One big one concerns creativity. Since the models produce their outputs based on past data, the range of potential solutions they can identify will always be limited to their training data.

Excessive reliance on the same models could start eroding consultant companies’ ability to innovate, by diluting their distinct competitive advantages and make them increasingly resemble each other.

Such a phenomenon has already been observed in research looking into generative AI’s effect on student creativity.

My own research has shown that excessive reliance on automation technologies like generative AI can lead to the erosion of professional expertise. In the long run, this effect could seriously organizations’ knowledge and business reputation.

If younger consultants still in training offload too much of their thinking and analytical work to generative AI, they may fail to develop their own analytical abilities.

And of course, the technology itself isn’t perfect. Generative AI is known to make mistakes and even “hallucinate”—that is, completely make things up.

All of this highlights the importance of using generative AI thoughtfully, and perhaps above all, not losing sight of the unique value humans can bring.

Provided by
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This article is republished from The Conversation under a Creative Commons license. Read the original article.The Conversation

Citation:
Artificial intelligence is taking the consulting industry by storm—should we be concerned? (2024, August 1)
retrieved 1 August 2024
from https://techxplore.com/news/2024-08-artificial-intelligence-industry-storm.html

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Getting to the root of a plant’s success

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Getting to the root of a plant’s success


Getting to the root of a plant's success
A closeup image of a switchgrass root (colored in teal) seen through the lens of a confocal microscope. The fiery orange specks show the fluorescently-labeled microbes that work in tandem with the plant to survive. Credit: Joseph Edwards, University of Texas at Austin

Plants are powerful factories—they can turn basic ingredients like carbon dioxide, water, and sunlight into oxygen, sugars, and plant mass. But plants don’t do all of this work on their own.

Below the soil’s surface, plant roots work with tiny microbes to gain access to the nutrients they need to survive. This microbial ecosystem, known as the plant microbiome, has the power to make or break a plant’s success aboveground.

A team of researchers led by the University of Texas at Austin, using resources from the Joint Genome Institute (JGI), a Department of Energy (DOE) Office of Science user facility, investigated how the genetics of a plant can affect its relationship with microbial communities in the soil.

Until recently, scientists had a limited understanding of how a plant’s genetic information might influence which microbes get involved belowground. But through this work, they learned how certain genes in a particular plant, switchgrass, play a role in how the plant recruits its microbiome.

Switchgrass is a hardy, tall grass that is extremely drought tolerant. It is able to produce an impressive amount of biomass, which we may be able to convert into sustainable biofuels in the future. Because of this potential, DOE researchers have been studying this plant for nearly two decades.

By mapping connections between switchgrass genes and helpful microbes, the researchers aimed to identify which plant-associated microbiota can help the plant grow faster and produce more biomass.

Researchers investigated switchgrass plants grown in field sites in Texas, Missouri, and Michigan. This collaborative group also included scientists from the HudsonAlpha Institute for Biotechnology, the University of Missouri, and Michigan State University.

Through genome sequencing efforts at the JGI, the team identified which microbes were present in each of the soil samples. The researchers also pinpointed sections of the plant host genome that are associated with varying amounts of microbes.

This work revealed that the plant genes involved in immunity, development, and signaling were the most influential on the root microbiome makeup. These results provide a better understanding of how plants recruit vital microbes.

This information may help researchers as they set out to engineer or breed plant varieties that perform even better in difficult growing conditions.

Citation:
Getting to the root of a plant’s success (2024, August 1)
retrieved 1 August 2024
from https://phys.org/news/2024-08-root-success.html

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Sorting machine separates 16 million mosquito pupae a week, greatly reducing population

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Sorting machine separates 16 million mosquito pupae a week, greatly reducing population


Sorting machine separates 16 million mosquito pupae a week greatly reducing population
The automated mosquito pupa sex sorting system. Credit: Jun-Tao Gong. From Science Robotics (2024). DOI: 10.1126/scirobotics.adj6261

A team of engineers and pest control specialists in China has developed a machine that is capable of gender-sorting 16 million mosquito pupae a week. In their paper published in the journal Science Robotics, the group describes how they designed and built their sorter and how well it has worked during testing.

Prior research has shown that mosquitoes carry viruses such as Zika, West Nile, Chikungunya and dengue, as well as parasites such as those responsible for the spread of malaria. Scientists have been looking for efficient ways to reduce their numbers in places that are most susceptible to the diseases they spread.

One approach involves breeding millions of sterile male mosquito pupae and releasing them into the wild. The sterile pupae develop into mosquitos that take the place of fertile males in mating with females, resulting in fewer viable mosquito larvae and eventually fewer mosquitoes overall. Such breeding efforts require that the female mosquitos produced during breeding are not released into the wild; thus, the pupae need to be sorted by gender.

Currently, the process is inefficient because it is done manually. The research team developed a machine that is able to do the job automatically, approximately 17 times faster and with fewer mistakes—which the researchers claim comes to approximately 17 million pupae a week. The researchers note that the machine, which has a special sorting glass, is capable of collecting, loading and sorting millions of pupae every day.






Given the potential variation in mosquito immature development across different batches, the sorter was calibrated for each batch of pupae at the beginning of sex separation to optimize the accuracy by adjusting the technical parameters, including the slope of the outer sorting glass, through the touch screen on the control panel. Once calibrated, sex separation operated automatically until all pupae were sorted. Credit: Jun-Tao Gong

The research team has already tested their sorting machine on two kinds of mosquitoes in parts of Guangzhou, China. They report that use of their sorting machine resulted in significant reductions in mosquito populations in the area. During testing, they also discovered that their device was so easy to operate that one person could run several of them at the same time. Several of the machines have already been sold to customers in Italy, France, the U.S., and Mexico.

More information:
Jun-Tao Gong et al, Upscaling the production of sterile male mosquitoes with an automated pupa sex sorter, Science Robotics (2024). DOI: 10.1126/scirobotics.adj6261

© 2024 Science X Network

Citation:
Sorting machine separates 16 million mosquito pupae a week, greatly reducing population (2024, August 1)
retrieved 1 August 2024
from https://techxplore.com/news/2024-08-machine-million-mosquito-pupae-week.html

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Economic prospects brighten for children of low-income Black Americans, study finds

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Economic prospects brighten for children of low-income Black Americans, study finds


Black children
Credit: Unsplash/CC0 Public Domain

Economic prospects have improved in recent years for Black Americans born poor, according to new research from Opportunity Insights. At the same time, earnings have fallen for white Americans from low-income families.

The analysis, drawn from 40 years of tax and Census records, finds a dramatic narrowing of the economic divide between the poorest Black and white Americans. But it also reveals a widening gap between low- and high-income white people, driven by shifts in the geography of employment.

“This is the first big data study to look at recent changes in economic opportunity within the same place over time,” said study co-author Benny Goldman, M.A., Ph.D., a research affiliate with Opportunity Insights. “And what we see are shrinking race gaps and growing class gaps.”

The research follows what Goldman called “a long history of folks studying intergenerational mobility.” That includes Opportunity Insights co-founder and director Raj Chetty, the William A. Ackman Professor of Public Economics and one of the study’s five co-authors. For more than a decade, Chetty has built an influential body of work demonstrating how access to the American Dream varies by region, race, and history.

Social scientists have found the patterns he uncovered to be persistent. For example, a Swedish demographer compared findings from a 2014 study co-authored by Chetty on upward mobility across generations in the U.S. to the prevalence of slavery from the 1860 census. Counties with high rates of bondage at the outbreak of the Civil War showed less mobility for residents born more than 100 years later.

With the new study, Chetty, and others, set out to investigate whether these dynamics are changing. Anonymized records provided by the federal government were used to compare earnings at age 27 with socioeconomic factors from childhood. The sample included 57 million Americans born in 1978 or 1992.

Across the country, the sample’s Black millennials fared better than its Black Gen Xers. Individuals born in 1978 to low-income families (with earnings in the 25th percentile or lower) averaged $19,420 per year in early adulthood compared to an inflation-adjusted $21,030 for poorer members of the 1992 cohort.

Outcomes also improved slightly for children born to high-income Black families, though researchers noted “noisier,” or less reliable, estimates for this population due to a small sample size.

Outcomes showed wide variation by region, with Black Americans making the biggest strides in the Southeast and Midwest—areas traditionally associated with high rates of Black poverty.

“Take where I grew up in Kalamazoo, Michigan,” offered co-author Will Dobbie, a professor of public policy at Harvard Kennedy School and faculty research fellow at the National Bureau of Economic Research. “Poor Black kids born there in 1992 were earning $4,700 more at age 27 than poor Black kids born there in 1978, an incredible improvement in just a few years.”

Meanwhile, white Gen Xers from poorer families averaged $27,680 per year versus $26,150 for millennial peers. The gap between the poorest and richest white people ballooned by 28% over the same period, as those born at the top watched their fortunes climb.

Results were particularly stark in a few regions of the country known for prosperity.

“Outcomes for low-income white children born in the ’90s from parts of Massachusetts, Connecticut, rural New York, and California started to look like Appalachia, the Southeast, and the industrial Midwest did for low-income white children born in the late ’70s,” noted Goldman, now a newly installed assistant professor of economics and public policy at Cornell University.

“This work reinforces the importance of childhood communities for outcomes in adulthood, consistent with our prior findings,” Chetty wrote in an email.

“But it shows that it is possible for these communities to change rapidly—within a decade—in a way that has significant causal effects on children’s long-term outcomes.”

To be sure, vast racial disparities persisted. For Gen Xers who grew up poor, the racial earnings gap between Black and white Americans was $12,994. For millennials, it fell 27 percent to $9,521. In a research summary, modest changes in economic mobility were noted for Hispanic, Asian, and Native American children.

As an additional aspect of their analysis, the researchers checked their findings against historic rates of parental employment at the neighborhood level. This approach was inspired by the work of Harvard sociologist William Julius Wilson, author of “When Work Disappears: The World of the New Urban Poor” (1996). “It was used as a broad way to measure the health of any given community where kids grew up,” Goldman explained.

The researchers saw that neighborhood employment tracked neatly with emerging race and class differences. “We found a sharp decline in employment rates among lower-income white parents relative to low-income Black families and higher-income white families,” Goldman said.

Declining earnings were hardly the only negative associated with growing up amid low parental employment. In a testament to the power of social connections, places with fewer working parents also saw rising mortality and falling rates of marriage.

Yet this wasn’t a case of opportunity moving from one group to another, since neighborhoods with higher rates of adult employment saw better outcomes for people of all races. “In areas where Black kids did best, low-income white kids and their parents also did better,” Goldman said.

What’s more, the researchers found that moving to areas with strong parental employment was associated with higher earnings in early adulthood. According to Goldman, this was especially true for those who landed in the new neighborhood before the age of 10.

“Growing class gaps and shrinking race gaps did not result from unequal access to a booming economy,” he said. “Instead, what matters is how many years of childhood were spent in a thriving environment.”

More information:
Raj Chetty et al, Changing Opportunity: Sociological Mechanisms Underlying Growing Class Gaps and Shrinking Race Gaps in Economic Mobility, (2024). DOI: 10.3386/w32697

Provided by
Harvard University


This story is published courtesy of the Harvard Gazette, Harvard University’s official newspaper. For additional university news, visit Harvard.edu.

Citation:
Economic prospects brighten for children of low-income Black Americans, study finds (2024, August 1)
retrieved 1 August 2024
from https://phys.org/news/2024-08-economic-prospects-brighten-children-income.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





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