The Long March 5 blasts off from Wenchang Space Launch Center in South China's Hainan province, Nov 3, 2016. [Photo by Su Dong for China Daily] Chinese engineers have determined what caused the failure of the second flight of China's largest carrier rocket, a Long March 5, in July and have come up with corrective solutions, according to the State Administration of Science, Technology and Industry for National Defense, which oversees the program. The administration said in a statement on Monday on its website that a number of simulations, calculations and ground experiments were carried out and results point to structural abnormalities inside the turbine exhaust device of one of the first stage's liquid oxygen/liquid hydrogen engines. The abnormalities caused a sudden loss of engine thrust, depriving the rocket of lift, the statement said. So far, engineers have carried out several ground ignition tests on the modified engine and concluded that the changes are effective, it said, adding that a third Long March 5 is under construction and will be launched this year. The statement did not say what that rocket's payload will be. If the third flight goes well, then the rocket's fourth mission will send the nation's Chang'e 5 lunar probe to the moon, the administration said. Scientists and engineers are pinning their hopes on the Long March 5 and its variants because the space industry wants to use them to ferry the first Chinese space station into orbit, as well as send probes to Mars and Jupiter. The July failure affected the country's space agenda as the government had to postpone several key missions, including the Chang'e 5 expedition, which will send a rover to the moon and return with surface samples. China's space launch activities were suspended for nearly three months after the failure. They resumed at the end of September. The strongest and most technologically sophisticated rocket built by China, the Long March 5 has a liftoff weight of 869 metric tons, a maximum payload of 25 tons to a low-Earth orbit, or 14 tons to a geosynchronous transfer orbit. Its payload capacity is about 2.5 times greater than any other Chinese rocket. The giant rocket's first flight was in November at the Wenchang Space Launch Center in Hainan province. Engineers have started assembling the first prototype of the Long March 5B, a variant that will be tasked with lifting the Chinese space station's core module and other parts, the China Manned Space Agency said last month. That rocket is expected to make its first flight around June next year to verify its reliability and capabilities, the agency said. wristbands canadacustom silicone bracelets canadarubber bracelets canadasilicone bracelets canadasilicone wristbands canadacustom wristbands canadacanadian wristbandswristbands canada
A woman who successfully received a womb gives birth to a healthy baby boy at the Xijing Hospital in Xi'an, Northwest China's Shaanxi province, Jan 20, 2019. [Photo/Xinhua] XI'AN -- A woman who successfully received a womb donated by her mother after a uterus transplant in November 2015 gave birth to a healthy baby boy in northwest China's Shaanxi Province on Sunday. Weighing 2 kg and measuring 48 cm long, the baby is considered to be China's first and the world's 14th baby who was born from a transplanted womb, said doctors with the Xijing Hospital in Xi'an, where the baby was born and the previous uterus transplant was performed. Twenty-six-year-old Yang Hua, the new mother, was born without a uterus but has her own ovaries which produce eggs. When the mother-daughter womb transplant, also China's first human womb transplant, was done in 2015, Yang was 22 and her mother was 43. Doctors perform a cesarean operation on a woman who has successfully received a womb at the Xijing Hospital, Jan 20, 2019. [Photo/Xinhua] Uterus transplants are not new. In the 1960s, Britain and the United States began to experiment with uterus transplants on animals. In 2000, the world's first human womb transplant took place on a 26-year-old woman in Saudi Arabia. The transplanted uterus failed after three months and had to be removed. In 2011, doctors successfully performed a uterus transplant on a woman in Turkey. Two years later, nine women in Sweden successfully received transplanted wombs donated by relatives. Chen Biliang, director of the obstetrics and gynecology department of Xijing Hospital, said uterus transplants still remain a medical challenge in the world today. Photo taken on Jan 22, 2019 shows the baby who was born from a transplanted womb at the Xijing Hospital. [Photo/Xinhua] The uterus, with plenty of tenuous blood vessels, grows in the depths of a woman's pelvic cavity. Therefore, a string of problems including cutting, the structure of the blood vessels during the transplant and strong rejection reactions may occur, said Chen. There are about one million women in China who are suffering from uterine infertility. Due to the limitation of the current assisted reproductive technology and the prohibition of surrogacy in many countries, uterus transplants have provided an effective way for women plagued by uterine infertility to have their own babies, according to Chen.
