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Chinese navigation system BeiDou

01.01.2020

After years of development, China's BeiDou (BeiDou Navigation Satellite System, BDS), which is the Chinese equivalent of the US GPS, European Galileo, and Russian GLONASS, is nearing a climax.

Project Manager Ren Chengki reported that the main constellation of BeiDou satellites has been formed - the last 56th and 57th satellites, they are also the 23rd and 24th satellites from the main constellation of the third-generation Beidou positioning system, were launched on December 23 by a Long March 3B rocket .

Since the launch of the first third-generation BeiDou satellites in November 2017, China has conducted a total of 18 launches, in which 30 satellites have been launched. In total, since 2000, when the deployment of the BeiDou satellite system began, the project has launched 57 satellites, including four test vehicles. BeiDou was launched commercially in late 2012 as a regional positioning system (in China and other parts of the Asia-Pacific region), and became global in late 2018. There are currently 46 operational Beidou satellites in orbit.

The China Satellite Navigation Office plans to place two more BeiDou satellites in geostationary orbit in the first half of 2020. Technically, this marks the completion of the third phase of Baidou's development and represents the culmination of the satellite system project in its current form. According to the project leader, the next major upgrade of BeiDou is planned no earlier than 2035.

Most Chinese users will be able to take advantage of the new global geopositioning system immediately without the need for any action. According to Nikkei, about 70% of Chinese smartphones already support BeiDou. In addition, there are already 120 partners declaring their readiness to use BeiDou for mapping.

As with Russia's GLONASS, China's desire to build its own satellite navigation system is driven by a desire to gain independence from the US and its GPS system. For China, the BeiDou system is one of the priority technology areas along with 5G and self-driving cars.

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ultrasound for diabetes 17.04.2022

An international team of scientists has figured out how short pulses of ultrasound, targeting specific clusters of nerves in the liver, can effectively lower insulin and blood glucose levels in diabetics.

So far, the technique is being tested on humans and is quite complicated, but scientists are confident that they will be able to create portable devices for monitoring blood glucose and insulin levels.

Unfortunately, there are currently very few drugs that actually lower insulin levels. Meanwhile, to maintain the health of patients with diabetes, it is necessary to be able to keep a balance in the level of glucose in the blood. The introduction of insulin reduces its concentration, but too low a glucose content can cause hypoglycemia and lead to death.

Scientists have demonstrated for the first time a unique non-invasive ultrasound technique designed to stimulate specific sensory nerves in the liver. This technology is called Peripheral Focused Ultrasound Stimulation and allows very precise targeting of subtle ultrasonic pulses to specific tissues containing nerve endings.

The study showed that just three minutes of exposure to focused ultrasound each day was enough to maintain normal blood glucose levels in diabetic animals. Human studies are currently underway to see if this method also works in the human body.

But there are many obstacles to the introduction of this technique into clinical practice, beyond the simple proof of its effectiveness. The fact is that the modern ultrasound instruments used to perform this therapy require trained technicians. The researchers suggest that it is possible to create technology to simplify and automate these systems so that they can be used by patients at home, but until it is developed, the widespread use of technology should be forgotten. Ideally, these should be wearable devices that the patient would not feel and could walk with them all the time.

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