Type 636/636A Haiyang 18 distant-ocean survey ships
| Type | Type 636 | Type 636A |
| Length | 129.82 meters | 129.28 meters |
| Width | 17 meters | 17 meters |
| Draught | 8.1 meters | 8.1 meters |
| Cruising speed | 15 knots | 15 knots |
| Maximum speed | 18 knots | 17.5 knots |
| Endurancec | 60 | 60 days |
| Range | 15,000 nautical miles / 15 knots | 15,000 nautical miles / 15 knots |
| Displacement | 5,872 tons | 5883 tons |
| Displacement, Full | more than 6,000 tons | |
| Maximum wind resistance rating | 12 | |
| Crew | 134 |
| Sequence | Pennant number | Name | Builder | Laid down | Commission | Status | Namesake |
| Type 636 | |||||||
|---|---|---|---|---|---|---|---|
| Haiyang 18 | 871 | Li Siguang | Wuhu Shipyard | ? | Oct 1998 | Active | famous contemporary scientist, geologist, educator and social activist |
| Haiyang 20 | 872 | Zhu Kezhen | Wuhu Shipyard | May 2003 | ? | Active | ONI = SHUPANG AGS famous contemporary geographer, meteorologist and education Home, the founder of modern geography in China |
| Haiyang 22 | 875 | Qian Sanqiang | Wuhu Shipyard | ? | 01 May 2008 | Active | ONI = SHUPANG AGS nuclear physicist, founder of China Atomic Energy Science |
| Type 636A | |||||||
| Haiyang 23 | 873 | Qian Xuesen | Wuhu Shipyard | ? | 26 Dec 2015 | Active | China Aerodynamics, Chinese Academy of Sciences and Chinese Academy of Engineering, two bombs and one star meritorious medal winner |
| Haiyang 24 | 874 | Deng Jiaxian | ? | ? | 02 Feb 2016 | Active | theoretical physicist, nuclear physicist, member of the Chinese Academy of Sciences, |
| Haiyang 25 | 876 | Qian Weichang | ? | ? | 25 Jul 2016 | Active, aka Xiangyanghong No. 25 | Chinese mechanic, applied mathematician, educator, modern Chinese mechanics, One of the founders of applied mathematics |
| Haiyang 26 | 877 | Chen Jingrun | ? | ? | 2016 | the most prodigious mathematician of his time | |
| Haiyang 27 | 878 | Wang Ganchang | ? | ? | 2017 | outstanding nuclear physical scientist and one of China's initial researchers in nuclear physics, cosmic rays and particle physics | |
| Haiyang 28 | 879 | Qian Wei Chang Zhu Guangya ??? | ? | ? | 2017 | Qian Weichang, Wei-Zang Chien was renowned as an applied mathematician and physicist before becoming famous for his efforts in higher education | |
| Haiyang 29 | 880 | Mao Yisheng | ? | ? | 2018 | Mao Yisheng was a pioneer in bridge building who revolutionized the engineering field — and he was Carnegie Mellon's first Ph.D. graduate | |
Chen Jingrun (1933-1996), perhaps the most prodigious mathematician of his time, focused on the field of analytical number theory. His work on Waring's problem, Legendre's conjecture, and Goldbach's conjecture led to progress in analytical number theory in the form of "Chen's Theorem," which he published in 1966 and 1973. His early life was ravaged by the Second Sino-Japanese War and the Chinese Cultural Revolution.
The Goldbach Conjecture is a yet unproven conjecture stating that every even integer greater than two is the sum of two prime numbers. The conjecture has been tested up to 400,000,000,000,000. Leonard Euler (1707-1783) corresponded with Christian Goldbach about the conjecture now named after the latter. Goldbach's conjecture is one of the oldest unsolved problems in number theory and in all of mathematics. On the verge of solving Goldbach's conjecture in 1984, Chen was struck by a bicyclist while also bicycling and suffered severe brain trauma.
During his hospitalization, he was also found to have Parkinson's disease. Chen suffered another serious brain concussion after a fall only a few months after recovering from the bicycle crash. With significant deficits, he remained hospitalized for several years without making progress while receiving modern Western medical therapies. In 1988 traditional Chinese medicine experts were called in to assist with his treatment. After a year of acupuncture and oxygen therapy, Chen could control his basic bowel and bladder functions, he could walk slowly, and his swallowing and speech improved. When Chen was unable to produce complex work or finish his final work on Goldbach's conjecture, his mathematical pursuits were taken up vigorously by his dedicated students. He was able to publish Youth Math, a mathematics book that became an inspiration in Chinese education.
Although he died in 1996 at the age of 63 after surviving brutal political repression, being deprived of neurological function at the very peak of his genius, and having to be supported by his wife, Chen ironically became a symbol of dedication, perseverance, and motivation to his students and associates, to Chinese youth, to a nation, and to mathematicians and scientists worldwide.
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