Returnees Dr. Zhang Shuangnan: astrophysicist who broke into the black hole of the universe.

Returnee Zhang Shuangnan in Queshan County of Henan province is a world-famous scientist studying black holes in the universe. In 1999, he was named one of the ten Chinese scientific and technological achievements by overseas Chinese media such as "world daily".
Student Era
Zhang Shuangnan was born in an intellectual family in Queshan County in December 1962. From primary school to high school, Zhang Shuangnan's academic record has been excellent. Especially in high school, many times won the first prize in the physics competition held in the county and county. Zhang Shuangnan was most grateful for his physics teacher in high school, who benefited from the teacher's inspiration and patient guidance, which made him slowly fall in love with physics. This laid a solid foundation for his study at Tsinghua University and later in physics research.
In 1979, Zhang Bi Nan entered the Engineering Physics Department of Tsinghua University with excellent results, which made him dream of going to university. This is also the resumption of the college entrance examination since the first student in Tsinghua University in the old district.
After graduating from university in 1984, Zhang Shuangnan was admitted to the Graduate School of high energy physics, Chinese Academy of Sciences. In the meantime, his advisor is known as "Chinese Mrs. Curie" famous physicist He Zehui academician. With the careful nurturing of He Zehui and other teachers, Zhang Shuangnan made rapid progress in academic research. In only two years, he passed the Ph.D. examination and became a Ph.D. candidate.
Challenge black hole
In 1986, a joint scientific research project was launched by the Institute of high energy physics, Chinese Academy of Sciences and the Department of physics of SOUTHAMPTON UNIVERSITY, University of Southampton. After the completion of the project, Zhang Shuangnan was left in the UK to pursue his doctorate, and received a scholarship from University of Southampton and a British Overseas Scholarship. He received his doctorate in University of Southampton in 1989.
At the end of 1989, Zhang Shuangnan applied for postdoctoral research from University of Pennsylvania in the United Kingdom. After completing the post doctoral research, he went to astrophysics research at the Marshall Flight Center of the US space and space agency in 1992. Zhang Shuangnan went to the Marshall space flight center and entered a new stage in the study of astrophysics. At that time, his research results were constantly shaking up in the astrophysics field, which made many famous scientists in the world look up to the young scientist from China. In the meantime, he invented a new method of image processing, which was published in 1993 by the first author in the most authoritative English Nature magazine in the world. In 2000, Zhang Shuangnan published the latest achievement of black hole research in the American science magazine with the first author.
Zhang Shuangnan used his method of image processing to discover second "quasars" (a black hole binary system) in the galaxy and his colleagues, and named it GRO J1655-40. Zhang Shuangnan later discovered several other black hole binary systems with his colleagues. He and his colleagues won the "collective achievement award" issued by NASA by virtue of their outstanding achievements in this field.
In order to measure the rotational nature of the black hole, Zhang Shuangnan and two other Chinese scientists Cui Wei and Chen Wan put forward a method to measure the rotation of the black hole in 1997. First, we measured the rotation of a group of "black holes" and got the tangential evidence of the "black hole" rotation. The publication of "the astrophysics", an authoritative academic journal in the United States, has aroused great interest in the academic field.
Feelings of children
Although Dr. Zhang Shuangnan has lived in the United States for more than ten years, but as a Chinese nation, he loves his motherland and loves his hometown. He has not forgotten that he is a Chinese. He said, "I belong to the motherland forever." Since 1996, he has returned to China many times to report his achievements in science. He has been lecturing at the Chinese Academy of Sciences, Tsinghua University, Peking University, University of Science and Technology of China, Nanjing University, Nanjing University, Institute of science and technology, and other universities for academic reports, making academic exchanges and contributing to the promotion of science and technology in China.
He returned to his hometown to visit his teachers, relatives and friends, and to learn about the development of science and technology and education in his hometown. He went to school in his hometown to give lectures, stimulate students' interest in learning, encourage students to study hard, and strive to win glory for the country. To train scientific research personnel in China, he has recruited many PhD students and visiting scholars from the mainland to guide them in scientific research.