Kelly performed a spacewalk outside the space station on November 6, 2015. Time – an important “link” When humans have the opportunity to explore Mars, the crew members will carry out the mission and travel to places millions of miles away from our planet. Scientists want to understand as much as possible about the potential effects of microgravity and radiation on the human body. A big step towards this goal is the One-Year Mission, when NASA astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko spent 340 days aboard the International Space Station from March 2015 to 2020. 2016. Space explorers have spent nearly a year living in zero gravity. The data collected before, during and after their flight made a big contribution. This will help researchers better understand what happens to the human body in space. One concern has arisen regarding astronauts, when their eyes change over long periods of time in space. This change is thought to occur when astronauts are in space for six months or more. Time spent in space also has potential impacts on their vision health. According to researchers, crew members typically spend four to six months on the space station. However, future planned missions lasting a year or longer should be considered. The effect on astronauts’ visual health as a result of long-term flight was previously known as visual impairment and intracranial pressure, or VIIP syndrome. The researchers are now referring to ophthalmic and neurological findings in astronauts after long-duration spaceflight, such as spaceflight-associated optic nerve syndrome, also known as SANS. A new study focusing on eye changes and problems astronauts Kelly and Kornienko experienced has been published in the journal JAMA Opthalmology. “About six months after astronauts began their space missions, we started to observe changes in the eyes of some people. Those changes didn’t show up during their roughly two-week mission aboard the space shuttle,” said study author Brandon R. Macias, director of the Cardiology and Vision Laboratory at NASA Johnson Space Center. in Houston said. According to Macias, the team’s preliminary findings suggest that the duration of the space mission could be responsible for changes in eye structure for the worse, such as swelling of nerve ending tissues. vision. This change has been noticed in some astronauts who have been on missions longer than a year in space. The premise for the future American astronaut Scott Kelly (left) and Russian cosmonaut Mikhail Kornienko (right) spent a year on the space station. The changes in astronauts Kelly and Kornienko were compared with crew members who spent about six months on the station. Both of these astronauts experienced many changes in eye structure. One of them developed mild optic disc edema. “Disc edema can occur when the nerve fibers at the back of the eye swell or when CSF (spinal fluid) builds up around the nerve fibers. If the swelling is severe and persists for a long time, visual function can be affected,” explains Macias. Meanwhile, the other astronaut suffered from optic disc edema and the growing growth of choroidal folds. Both of them used to not realize the changes they were going through. “The retina at the back of the eye is a smooth layer,” says Macias. Folds develop when this tissue becomes wrinkled and uneven. These folds can have different patterns depending on their location and severity. This condition has the potential to impair visual function.” Two astronauts recovered from optic disc edema after returning from space. However, the choroidal folds do not always fully recover. These structural changes did not result in any significant functional changes to the eye. “There is a concern, however, that longer space missions could contribute to more structural changes to the eye. The longer these structural changes take place, the more likely they are that they can cause damage to the retina,” warns Macias. The researchers believe the new findings are a reliable measurement for monitoring the crew members’ eye structures, as well as their long-term health upon their return to Earth. At the same time, the scientists also wanted to understand why some crew members had more eye changes than others. That information could help the team figure out how to prevent neuro-eye syndrome associated with space flight. The team will measure eye activity before, during and after the task by electromechanical methods. Simultaneously, the electrical response of the light-sensitive cones and rods of the eye is measured. Scientists will also look at changes in blood flow in the retina. This may provide more insight into why some crew members undergo more changes than others.

The US has a rather slow 5G rollout. Photo: NetEase Since the advent of 5G technology, US carriers have been slow to deploy 5G networks. The main reasons are limited spectrum resources available for 5G, cumbersome deployment of 5G devices, and lack of killer applications for 5G services. The media often uses words like “fast” to describe 5G speeds, but the speed of 5G wireless network rollout in the US has nothing to do with the word. Over the past three years, the prospect of 5G wireless networks has been the focus of major media reports. But for most Americans, the real 5G that can achieve the desired effect is yet to emerge. Although all the major wireless carriers in the country claim that their 5G services have covered the entire US, industry analysts argue that this so-called 5G service is not much different from the US. 4G. According to market research firm Evercore ISI, most Americans may not enjoy 5G service that is significantly faster than current wireless communication networks. “Overall, it is expected that between late 2021 and late 2023, truly better 5G services will cover two-thirds of the US population,” said James Ratcliffe, an analyst at Evercore ISI. The first batch of mobile phones that support 5G networks was launched in mid-2019, according to Ratcliffe, in the most optimistic scenario, wireless network operators will be able to provide “real” 5G services to 2/3 of the US population in the next 30 months. Meanwhile, the first mobile phone to support 4G network was released in 2010, and the US 4G network was basically rolled out 18 months later. Analysts, academics and former industry executives say a combination of factors has resulted in a relatively slow rollout of 5G networks in the US. Some of these problems are related to network infrastructure: high-speed network transmission frequency bands and signal coverage are limited. Moreover, the new network equipment that needs to be on the shelves to deploy 5G networks is relatively cumbersome. In addition, many new devices are not made in the US, so the time to purchase the device will be longer. Industry observers also point out that the current 5G network still lacks breakthrough applications, and cannot stimulate user demand and promote the spread of services such as mobile video in 4G networks. John Roese, chief technology officer of Dell Technologies and a former executive at companies like Huawei and Nortel, said that although wireless operators have recently invested billions of dollars in 5G networks, when Because their revenue in 5G-related businesses is not stable, they may not be able to accelerate the construction of new networks. According to Mr. Roese, wireless network operators have had disappointing returns when investing in 4G networks. He said that the main beneficiaries of 4G networks are technology companies that provide applications and other services through the network. “So wireless operators are very cautious about this.” Limited frequency range Photo: Sina To meet the large traffic that 5G networks have to transport, carriers need to open “highways” for data. The spectrum is similar to the real estate that the government grants to carriers through auctions to build highways. The more land they have, the more lanes they can open for faster 5G and easier access. Currently, 5G networks mainly transmit data through low-band, mid-band and high-band. High-band (mmWave) aka millimeter wave has the highest data transfer rate and largest bandwidth, but the smallest coverage. Low band has wider coverage but slowest transmission speed. Finally, the mid-band is considered to be the balance between coverage and transmission speed. Companies like Verizon, AT&T, and T-Mobile all claim that their 5G networks now cover more than 200 million Americans, enough to meet US demand. However, most of these networks rely on low-band radio waves to complete coverage, and network transmission speeds are limited. Wireless network operators are currently focused on capturing mid-bands and have invested a lot of money in recent tenders for these resources. But the main problem facing these companies is that most of the mid-band bands have been occupied by US government agencies and other agencies, mainly for military communications and meteorological services. . Until now, wireless network operators could only use a fraction of the mid-band resources. US government agencies are also aware of the lack of mid-band resources. Earlier this year, the US auctioned a total of $81 billion in mid-band licenses, and plans to hold another auction this fall. When operators were preparing to roll out 5G nearly 10 years ago, they generally believed that 5G networks would primarily use high-frequency radio waves, said Stefan Pongratz, analyst at Dell’Oro Group. . This portion of the spectrum resource is essentially unused. But Pangraz says that rolling out a 5G network using millimeter waves requires building more base stations, which will certainly take time to increase deployment density of base stations. He said that until recent years, the US turned its attention to mid-band radio waves as a way to roll out 5G networks faster. Where is the profit point? Photo: Justin Hall Comics Brian Kelley, an associate professor of electrical engineering at the University of Texas at San Antonio, said the lack of disruptive applications is another major factor hindering the rollout of 5G networks. Mr. Kelly, who was an engineer at Motorola, said: “It can be said that this is the biggest factor that can stimulate the speed of 5G deployment.” According to analyst Craig Moffett, the 3 main advantages of 5G networks are faster data transmission (100 times faster than 4G), support for a large number of simultaneous connections, but also significantly improved response speed between devices. device is connected. “There isn’t a single revenue model that can combine these three advantages. It’s not even clear if consumers are willing to pay more for faster video downloads,” Moffett said. Moffitt said that because 5G networks can seamlessly connect sensors and other IoT devices, companies will likely be the first adopters of 5G services. He said that 5G networks “can be considered the next generation of Wi-Fi wireless networks, which are faster, more secure and can connect more devices”. But Moffett said the question is: “Will wireless operators build their own 5G networks for enterprises, or will the enterprises themselves deploy them?” This is important, he says, because if businesses choose to deploy their own 5G networks, wireless operators may lose the associated revenue and not be able to invest more money in building infrastructure. 5G layer. Device problem Currently, in the world, there are 5 companies that have successfully produced network equipment for 5G, none of which is in the US. Photo: Sina 5G networks are very different from 4G, in part because 5G networks need to transmit data at a higher frequency band. This means that upgrading 5G networks requires different technologies and devices. Evercore analyst Ratcliffe says installing new equipment can require finding a suitable location, obtaining the right permits, and even digging up roads and laying fiber optic cables to transfer data at high speeds between base stations. Gazzola, chief executive officer of Atlanta-based infrastructure company Bennett & Pless, said it is expected that by 2022, the construction work needed to bring wireless communication networks to 5G standards will increase. . However, the epidemic and technical obstacles have delayed progress. Equipment availability is also a common issue faced by wireless network operators. Dell’s Rose said that when 4G was first introduced around 2010, there were about a dozen technology vendors offering wireless networking equipment, including Canada’s Nortel and America’s Motorola. Today, there are only five major players in the global network equipment market: Nokia, Ericsson, Samsung, ZTE and Huawei. “Two in China. One in Finland, one in Sweden and one in Korea.” These suppliers are all located outside the US. Worse still, 5G network equipment requires computer chips while the chip industry has been struggling recently to cope with supply shortages.

After receiving the order, it took 2 months for Amazon to deliver the camera to Bill and Kelly Chiles. When he opened the box, Bill saw two camera boxes inside, but both were empty. Ordered a Sony camera for $7,000 on the Internet but only received an empty box. Photo: Denver7. In an interview, Bill said that he was “shocked” when he did not see any cameras. “I’ve heard the same thing happen with 3rd party delivery, not Amazon,” Bill said the amount of money he and his wife saved up to buy the camera. “We used to buy cameras on Amazon and have not had any problems,” the photographer said. When contacting Amazon, Bill continued to be surprised when the people who received the complaint behaved irresponsibly, claiming the package was authenticated and refusing to refund. Amazon employees even hang up the call themselves when there are no support issues. Kelly Chiles, Bill’s wife, expressed frustration with Amazon’s support, despite sending proof of the problem with the package. Accordingly, the box sent by UPS weighs only 0.9 kg, while the Sony website says that the camera packaging box weighs more than 1.4 kg. Bill expressed frustration when Amazon employees responded irresponsibly, refusing to refund. Photo: Denver7. “Someone stole the camera. In fact, they stole both because 2 boxes have serial numbers close to each other,” Bill did not rule out the case that Amazon employees stole the camera, and they were covering their luggage. vi for each other. In addition, he also discovered that the same model was sold on secondhand markets in the area, cheaper than the original price of the company. Bill and Kelly filed a complaint with the local police and emailed Jeff Bezos. The response email said that once the credit card dispute is resolved, Amazon will process the claim. The platform also entered the investigation after the incident was shared on the Internet. This is not the first time this has happened. In 2018, YouTube channel owner Chasontwowheels reflects ordering a Canon 1DX Mark II camera but only receiving an ice box. When contacting for exchange, the second parcel was filled with bricks. Apple is creating a device with 15 cameras, 2 screens of 8K The headset will integrate 15 cameras, 2 8K screens and an adjustable strap. Perhaps for a long time, AR/VR headsets will become a reality.

Let’s listen to the secret to keeping in shape and beautifying the skin of these two beauties! “4 do not eat” Shu Qi loves to enjoy delicious food but as an actress, she needs to keep her image and figure. So, she created a weight loss method called “4 don’t eat” for her own. The 4 things that “Golden Sword” beauties don’t usually eat are that they don’t eat meat, don’t eat desserts, don’t eat raw food and don’t eat green peppers. According to this beauty, meat contains a super high percentage of fat and calories, while sweets contain a lot of sugar, raw food will easily lead to edema, and green peppers are highly irritating. Therefore, Shu Qi does not eat these foods. She usually doesn’t eat anything 5 hours before going to bed. Looking at the food is full Shu Qi once told an interview on a program that when she was hungry, she often looked at food as full. This means that she will see photos of delicious food and treat it as if she was done. She thinks this method is quite effective. Playing badminton In addition to controlling her diet, Shu Qi also likes to exercise to lose weight. In addition to gym, she especially likes to play badminton. This is an exercise that helps to mobilize the whole body and burn fat locally, including the arms, thighs, buttocks, calves and other places, thereby helping to reduce body fat effectively. Thu Ky believes that badminton is both an exercise to lose weight, and an activity to relieve stress and entertain friends. Gluten-free diet Although Kelly Lin is 45 years old, her body is still very slim, no one thinks that she is the mother of 2 daughters. The actress advised fans to adopt a gluten-free diet, not eating foods containing wheat, barley and rye such as pasta, pancakes, beer etc. gluten-free foods like potatoes, corn, and vegetables and avoid greasy foods. Take care of sports Kelly Lin also loves sports as much as Shu Qi. She does 3-4 exercises per week including yoga, Pilates, swimming, brisk walking, running and cycling. Kelly Lin said that exercise is a way to eliminate toxins from the body, increase blood circulation, and make the skin more rosy and fresh. Quynh Trang/ According to Sundaymore