Wednesday, August 5, 2020

Forced Uyghur labour in China: Getting the World attention now

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Syed Ahmed Uzair

Article Title

Forced Uyghur labour in China: Getting the World attention now

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Global Views 360

Publication Date

August 5, 2020

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Mihrigul Tursun, former detainee at Uyghur mass internment camps in China, testifying in Washington

Mihrigul Tursun, former detainee at Uyghur mass internment camps in China, testifying in Washington | Source:    D.A. Peterson via Wikimedia

Since 2017 nearly a million ethnic minorities, mostly Uyghur Muslims from the far Western region of the Xinjiang province of China, have been put in  detention centres. The detainees in these camps are forced to renounce their faith and, in some instances, have been subjected to torture.

The Chinese government has termed the program as a combat against “religious extremism” even as it detains members of ethnic minorities from the region and sends them to the so-called “re-education camps”. The experts however believe that these people have been thrust into a systematic program of cultural genocide.

This campaign now appears to be proceeding towards a new direction wherein the Uyghur detainees are being shipped across the country for forced labour in factories.

As per the government officials, these “trainees” have all “graduated” and are being given employment in the form of factory labour to lead a better life. While China has made this their sole criteria to defend the program, there is mounting evidence that suggests that the Uyghurs are being subjected to forced labour and are not allowed to visit their families in Xinjiang.

According to a report by the Australian Strategic Policy Institute, the Uyghurs have been moved under a labour scheme known as Xinjiang aid to factories across the country straight from the detention centers. Many of these factories are a part of the supply chain network for well-renowned brands such as Apple, Nike, and Dell.

At the factories the workers are forced to live in separate rooms and are required to take Mandarin lessons under heavy surveillance. They are not allowed to leave their jobs and go back to their families in Xinjiang either.

John Oliver, host of popular US TV show “Last Week Tonight” recently aired an episode wherein he talked about the Uyghurs. “If this is the first time that you’re hearing about an estimated million people who’ve been held in detention camps – mostly Uighurs but also Kazakhs and other ethnic minorities – you are not alone. And it’s probably because China has done its level best to keep this story from getting out,” says Oliver.

John Oliver further said, “While there is clearly nothing new about horrific practices being hidden deep within the supply chain of global capitalism, what is happening to the Uighurs is particularly appalling”.

Despite China’s attempts at keeping the entire crackdown private, more and more horrifying details have come out in the open about the atrocities meted out to the Uyghurs via testimonies from former detainees.

This has led to an increased pressure on China as well as the big brands utilizing the Chinese supply chain network, to cut ties with factories where human rights are being violated under this Uyghur crackdown.

The US has restricted 11 Chinese companies from buying American goods due to claims of them being linked to the Xinjiang region. A coalition of over 180 organizations also called out dozens of clothing brands and retailers for links to the Xinjiang crackdown and forced Uyghur labour.

While some companies like PVH, the owner of brands like Calvin Klein and Tommy Hilfiger are working on reducing their presence in the Xinjiang region’s supply chain network others like Big W, a discount department store chain operated by Australia's Woolworths group acknowledged that some of their products might be unintentionally coming from the regions of Xinjiang province.

Companies like Nike, Puma, and Adidas have however continued to deny allegations of links to factories with forced Uyghur labour completely. In their statement Nike said, "We have confirmed with our contract suppliers that they are not using textiles or spun yarn from the region."

With the increasing spotlight on the Chinese government’s repressive activities,  international pressure is increasing on the business groups which depend on China for supply change, to come clean on any link of their vendors with Uyghur forced labour. There might be some hope, even if very little, for the plight of the Chinese Uyghurs after all.

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April 13, 2021 2:10 PM

Detecting The Ultra-High Energy Cosmic Rays With Smartphones

Smartphones have become the most commonplace objects in our daily lives. The unimaginable power that we hold in our hands is unrealized by most of us and, more importantly, untapped. Its creativity often gets misused but one can only hope that it’s fascinating abilities would be utilized. For example, did you know that the millions of phones around the globe can be connected to form a particle detector? The following article covers the CRAYFIS (Cosmic RAYs Found in Smartphones) phone-based application developed by the physicists from the University of California—Daniel Whiteson, Michael Mulhearn, and their team. CRAYFIS aims to take advantage of the large network of smartphones around the world and detect the cosmic or gamma rays bursts which enter the Earth’s atmosphere almost constantly.

What Are Cosmic Rays?

Cosmic rays are high velocity subatomic particles bombarding the Earth’s upper atmosphere continuously. Cosmic ray bursts have the highest energy compared to all forms of electro-magnetic radiation. When we say ultra-high energy particles (energy more than 1018^eV), we mean two million times more energetic than the ones that can be produced by the particle colliders on Earth.  These rays are thought to be more powerful than typical supernovae and can release trillions of times more energy than the Sun. They are also highly unpredictable as they can enter Earth’s atmosphere from any direction and the bursts can last for any period of time ranging from a few thousand seconds to several minutes.

Despite many theoretical hypotheses, the sources of these ultra-high energy cosmic rays are still a mystery to us even after many decades of their discovery. These rays were initially discovered in the 1960’s by the U.S. military when they were doing background checks for gamma rays after nuclear weapon testing. Cosmologists suggest that these bursts could be the result of super massive stars collapsing - leading to hypernova; or can be retraced to collisions of black holes with other black holes or neutron stars.

How Do We Detect Them?

When the high-energy particles collide with the Earth’s atmosphere, the air and the gas molecules cause them to break apart and create massive showers of relatively low-energy particles. Aurora borealis i.e., the Northern and the Southern lights are the lights that are emitted when these cosmic rays interact with the Earth’s magnetic field. Currently, these particles are hitting the Earth at a rate of about one per square meter per second. The showers get scattered to a radius of one or two kilometers consisting mostly of high-energy photons, electrons, positrons and muons. But the fact that these particles can hit the Earth anytime and anywhere is where the problem arises. Since the Earth has a massive area, it is not possible to place a detector everywhere and catch them at the exact moment.

Energetic charged particles known as cosmic rays hit our atmosphere, where they collide with air molecules to produce a shower of secondary particle | Source: CERN

Detecting such a shower requires a very big telescope, which logically means a network of individual particle detectors distributed over a mile or two-wide radius and connected to each other. The Pierre Auger Observatory in South America is the only such arrangement where 1,600 particle detectors have been scattered on 3,000 square kilometers of land. But the construction cost of the same was about $100 million. Yet, only a few cosmic ray particles could be detected using this arrangement. How do we spread this network around the Earth?

In addition to being cost-effective, such a setup must also be feasible. The Earth’s surface cannot possibly be dotted with particle detectors which cost huge fortunes. This is where smartphones come into the picture.

Detecting The Particles Using Smartphones

Smartphones are the most appropriate devices required to solve the problem. They have planet wide coverage, are affordable by most people and are being actively used by more than 1.5 billion users around the planet. Individually, these devices are low and inefficient; but a considerably dense network of such devices can give us a chance to detect cosmic ray showers belonging to the highest energy range.

Previous research has shown that smartphones have the capability of detecting ionizing radiation. The camera is the most sensitive part of the smartphone and is just the device required to meet our expectations. A CMOS (Complementary Metal Oxide Semiconductor) device is present in the camera- in which silicon photodiode pixels produce electron-hole pairs when struck by visible photons (when photons are detected by the CMOS device, it leaves traces of weakly activated pixels). The incoming rays are also laced with other noises and interference from the surroundings.  Although these devices are made to detect visible light, they still have the capability of detecting higher-energy photons and also low-ionizing particles such as the muons.

A screenshot from the app which shows the exposure time, the events- the number of particles recorded and other properties

To avoid normal light, the CRAYFIS application is to be run during nighttime with the camera facing down. As the phone processor runs the application it collects data from its surroundings using a camera as its detector element. The megapixel images (i.e., the incoming particles) are scanned at a speed of 5 to 15 frames per second, depending on the frame-processing speed of the device. Scientists expect that signals from the cosmic rays would occur rarely, i.e., around one in 500 frames. Also, there is the job of removing background data. An algorithm was created to tune the incoming particle shower by setting a threshold frequency at around 0.1 frames per second. Frames containing pixels above the threshold are stored and passed to the second stage which examines the stored frames, saving only the pixels above a second, lower threshold.

The CRAYFIS app is designed to run when the phone is not being used and when it is connected to a power source. The actual performance would be widely affected by the geometry of the smartphone’s camera and the conditions in which the data is being collected. Further, once the application is installed and is in the operating mode, no participation is required from the user, which is required to achieve wide-scale participation. When a Wifi connection is available the collected data would be uploaded to the central server so that it could be interpreted.

There is much complicated math used to trace back the information collected from the application. The most important parameters for the app are the local density of incoming particles, the detection area of the phone and the particle identification efficiency. These parameters are used to find the mean number of candidates (photons or muons) being detected. Further, the probability that a phone will detect no candidates or the probability that a phone will detect one or more candidates is given by Poisson distribution. The density of the shower is directly proportional to the incident particle energy with a distribution in x and y sensitive to the direction in which the particle came from. An Unbinned Likelihood (it is the probability of obtaining a certain data- in this case the distribution of the cosmic rays including their energy and direction, the obtained data is arranged into bins which are very, very small) analysis is used to determine the incident particle energy and direction. To eliminate background interference, a benchmark requirement has been set that at least 5 phones must detect and register a hit to be considered as a candidate.

It is impossible to express just how mind-blowing this innovation is. As the days pass, Science and Technology around us keep on surprising us and challenge us to rack our brains for more and more unique ways to deal with complex problems. The CRAYFIS app is simply beautiful and it would be a dream-come-true to the scientists if the project works out and we are able to detect these high energy, super intimidating cosmic rays with smartphones from our backyard.

Further Reading

The paper by Daniel Whiteson and team can be found here.

An exciting book “We Have No Idea” by Daniel Whiteson and cartoonist Jorge Cham can be found here.

The CRAYFIS app can be found here.

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