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Daily Archives: June 25, 2022

In Pictures: 1960 Ferrari 250 GT Pinin Farina Coupe

Source : Bring A Trailer

20 Things We Learned from China’s 7th Census

Luo Yahan wrote . . . . . . . . .

The detailed results of China’s 7th census came out last week. The survey, conducted in 2020, reported top-line figures a few months ago, but with the release of the full report we can start to dig into details on gender, age, ethnicity, work, housing, household, and migration. There’s a lot to explore in this data, but here’s some of the first things we noticed, from an improving sex ratio to the tiny group of households who reported five generations sharing a single room.

Girls are most often born second

1. Second children are more likely to be girls than first children: in 2021, there were 113 firstborn sons for every 100 firstborn daughters, but only 106 boys born second for every 100 girls. Third children are even more skewed, with 130 boys born per 100 girls.

2. The most skewed generation was born between 2001 and 2005, with 116 boys for every 100 girls.
3. On average, men are better educated than women. Almost 18 million women have only a primary school education, compared to 15.8 million men. But women are more likely to have graduate degrees.

Taking care of the elderly is a growing problem

4. More than 33% of people over the age of 80 live alone.

5. Nearly 40,000 elderly people live alone and are unable to care for themselves, and do not have caregivers.

6. Liaoning province, in the northeastern rust belt, is China’s oldest province. 17.42% of the population is over 65 years old and 25.72% is over 60 years old.

Sixteen families could have seen Charlie and the Chocolate Factory and thought the Buckets had a lot of space

7. China’s densest cities are in Guangdong, which has only 32.28 square meters of housing per urban resident. That’s a bit bigger than a 40-foot shipping container. Rural residents of Jiangxi province have the most space, with 69.16 square meters.

8. But Shanghai has the fewest rooms per resident, with just eight rooms per 10 people.

9. China has 16 households in which five generations or more all live in one room. Five of them are in Guangdong.

10. Out of China’s 48.5 million households, 14% rent their homes. 67% of these pay less than 1,000 yuan ($150) per month.

Ethnic differences

11. Over 28% of people in Tibet over the age of 15 are considered illiterate — at least in Chinese. China defines literacy as mastery of 1,500 Chinese characters for rural people, and 2,000 for urbanites, and does not measure literacy in other languages.

12. In 13,114 households, people living together are registered as members of four or more ethnic groups.

13. The smallest officially recognized ethnic group in the Chinese mainland is the Gaoshan people, the indigenous population of Taiwan. 3,479 people claimed this identity in the census.

China’s biggest international population isn’t in Shanghai

14. There were 845,700 non-citizens living in China when the census was conducted. (That’s been changing fast, with the borders closed)

15. Over 350,000 are from Myanmar.

16. Yunnan province, on the border with Myanmar, had 376,689 non-citizens. 100,195 lived in Shanghai, 78,487 in Guangdong, 22,578 in Guangxi, and 44,997 in Beijing.

17. Almost half — 48.55% — of non-citizens had only a primary school education, or less. A third of non-citizens had lived in China for more than five years.

18. China has 16,595 naturalized citizens.

Zhejiang loves fancy cars

19. Zhejiang province, just south of Shanghai, owns by far the most luxury cars, with over 18% of all cars worth more than 1 million yuan.

20. Nationwide, 42% of households own at least one car.

Source : Sixth Tone

Infographic: the Coming Shift in Global Economic Power (2006-2036p)

See large image . . . . . .

Source : Visual Capitalist

Can You Stand on One Leg for 10 Seconds? You Might Live Longer

It sounds easy, but standing on one leg for 10 seconds can be harder than you think.

And your ability to do so — or not — may predict whether you are more likely to die within the next decade, a new study suggests. That’s why an international team of researchers says the 10-second test should be part of routine health checks for all middle-aged and older adults.

“[It] provides rapid and objective feedback for the patient and health professionals regarding static balance,” the researchers said, adding that the test adds useful information regarding a patient’s risk of premature death.

Dr. Claudio Araujo of the Exercise Medicine Clinic in Rio de Janeiro led the study.

Araujo’s team noted that balance, unlike aerobic fitness, muscle strength and flexibility, tends to be reasonably well preserved until a person’s sixth decade of life. It then wanes rapidly.

For the study, the researchers used data from the CLINIMEX Exercise study, which was set up in 1994 to assess links between ill health, death and various measures of physical fitness, exercise and conventional heart disease risks.

The investigators collected data at check-ups from about 1,700 white Brazilians (aged 51 to 75) between February 2009 and December 2020. The check-ups included weight, several measures of skinfold thickness, waist size and medical history. Only people who had a stable gait were included.

Each was asked to stand on one leg for 10 seconds without any added support. They were directed to place the front of the free foot on the back of the opposite lower leg, while keeping their arms by their sides and their gaze fixed straight ahead. They had up to three tries on either foot.

About one in five couldn’t do it. Failure was more likely with age, roughly doubling at five-year intervals from age 51 onward.

About 54% of 71- to 75-year-olds could not complete the test, according to the report published in the British Journal of Sports Medicine.

That was also true for 37% of 66- to 70-year-olds; 18% of those aged 61 to 65; 8% of 56- to 60-year-olds; and 5% of the 51- to 55-year-old age group.

That means those in the oldest group were 11 times more likely to fail than those who were 20 years younger, the study authors noted in a journal news release.

There were no clear differences in causes of death between those who could and those who could not complete the test. But the proportion of deaths among those who failed was almost 13% higher.

Those who failed were more likely to have poor health, including obesity, heart disease, high blood pressure, unhealthy blood fat profiles and type 2 diabetes, the study found.

When the researchers took into account for age, sex and underlying conditions, they linked an inability to stand unsupported on one leg for 10 seconds with an 84% higher risk of death from any cause within the next decade.

Over an average seven-year follow up, 7% of participants died — 32% from cancer; 30% from heart disease; 9% from respiratory disease; and 7% from complications of COVID-19.

As an observational study, the research doesn’t prove cause and effect. But the researchers said this simple and safe balance test could be included in routine health checks for older adults.

Source: HealthDay

Chinese Radar Breakthrough Will Enhance Power and Application of Commercial Drones

A breakthrough in radar technology allowed a commercial drone to capture high-definition images previously only achieved by military drones, according to the Shenzhen research team behind the development.

The researchers put a synthetic aperture radar (SAR) on a commercial drone and captured high-definition images in a test flight.

In the past, such a powerful radar system was only available for military drones, such as the Predator or Global Hawk, because the technology was big, sophisticated and consumed a huge amount of power.

Professor Huang Lei, lead scientist of the project with Shenzhen University, called the team’s new gadget “a disruptive technology”.

Besides drones, “it can be popularised and applied to other fields, such as intelligent driving, smart logistics, smart cities, emergency rescue and disaster relief to better serve the national economy and people’s livelihood”, he was quoted as saying in a report by Shenzhen Evening News on Monday.

Most civilian drones use optical cameras or laser sensors and are capable of only flying on a clear day with good visibility.

Military drones equipped with microwave radar can see at night, operating in nearly all weather, including smoke, rain, fog and haze.

The SAR can also identify material properties, moisture and other high-value information that is not obvious with optical imaging but of great importance in the military.

But to obtain a detailed image, the radar device usually has to collect, analyse and transmit a huge amount of data that makes the system bulky, costly and energy-intensive, significantly limiting its applications.

When Huang’s team raised the idea of the new microwave radar technology, known as 1-bit SAR, about eight years ago, some experts thought it would never work.

A key aspect of this new technology lies in a subversive imaging scheme, the 1-bit quantisation, or data compression, of analogue signals through non-linear mapping. It means mathematically converting a complex, two-dimensional radar image into a one-dimensional curve.

This algorithm significantly reduces the size, complexity and power consumption of a SAR without harming the image quality.

Huang’s team was not the first to come up with the idea, but previous attempts did not reach the practical stage because critical information was lost during the conversion.

The researchers said the performance of traditional SAR had almost reached its limits after a half-century of development because of the restrictions of electronic devices.

The 1-bit SAR technology opens another track, promising low-cost, lightweight, high-performance, high-speed radar for target detection, tracking, imaging and identification, they said.

The new technology was especially useful for applications with limited resources.

“At the same resolution, the data volume could be reduced by more than 50 per cent,” said Zhao Bo, a member of Wang’s team.

There is a race around the world to develop powerful radar for small drones.

The US Navy’s MQ-8 Fire Scout unmanned helicopter, for instance, carries a radar weighing less than 30kg (66 pounds).

A research team with the MIT Lincoln Laboratory said in a paper in 2018 they had developed a radar lighter than 1kg that could be carried by a hand-launched drone.

Source : Yahoo!

Read also at The Economist

Synthetic-aperture radar is making the Earth’s surface watchable 24/7 . . . . .