On Xu Houze's 70th birthday this year, several young people gathered around him and quarreled in his office.
A group of experts who came from other places to attend the academic seminar of Geological Survey Institute were puzzled: How can they shout so loudly in Academician Xu's office? The young people in this institute really don't respect Lao Xu.
The young man smiled. "There is no problem arguing with Lao Xu on academic and work issues. We are never afraid of him. "
Everyone called Xu Houze "Lao Xu". So that Yang Huijie, the wife of Academician Xu, often hears people say hello to her. Where is your old Xu?
Academician Xu is very gentle and never puts on airs. Anyone can talk to him about problems, and he is always willing to accompany him when he works in the geodetic station.
"If we have different opinions and have ideas in our hearts, we never hide them. We can tell him directly. " In this regard, the researchers of the Earth Institute are quite proud.
If there is any objection, Academician Xu never pretends to be an academic authority. He can say to the young man, "I will go back and think about this problem."
When Xu Houze gave an academic report, some young men who had just entered the gate of the Geological Survey Institute stood up and raised objections and discussed with him. Not only was he not angry, but he also said "well said".
Academician Xu likes to discuss problems with young people and read students' graduation thesis. As long as he is in Wuhan, he must attend all the student thesis defense and academic reports and seminars in the college.
Academician Xu said that he has benefited a lot from students and can learn a lot.
Xu Houze's students are all over the world, and many of them have become the main scientific and technological backbones of famous universities and research institutions.
When Academician Xu was on a business trip, in the words of his students, he was "critical" of himself. In the mid-1990s, academicians were expected to come to Beijing and always stayed in the bungalow guest house behind the government building of the Chinese Academy of Sciences. Once he rushed from Shanghai to Beijing for a meeting, and it took about twenty or thirty yuan to take a taxi to the airport. He looked for CMB everywhere with a slide projector in his hand. When he got on the bus, he proudly held out four fingers to the people who saw him off. "Just four dollars." Xu Houze said that the project funds should be used for real scientific research.
As an academician, he has his own spare time and a lot of happiness like ordinary people.
Academician Xu likes Beijing opera. When he is busy, he will listen to Cheng's Suolin Capsule or hum a song Dingjun Mountain to express his feelings. He said that he could hear the subtle differences between different schools of Peking Opera.
Academician Xu also likes watching football. Especially the international match with China, he won't miss it.
Watching movies, Academician Xu likes to watch classic blockbusters, such as Gone with the Wind and Titanic. He likes the fast pace of movies. Reporters Qu Lingyun and Xu Houze are famous geodesy and geophysicists in China, one of the outstanding scientists trained by the Institute of Geodesy of China Academy of Sciences, and the first batch of graduate students of China Academy of Sciences. 199 1 was elected as an academician of China Academy of Sciences. For nearly half a century, he devoted all his energy to the exploration of geodesy and geophysics, and made outstanding contributions to the development of geodesy and geophysics in China.
Like other research institutes of the Chinese Academy of Sciences, geodesy has always had an excellent style of study of seeking truth and being pragmatic, cooperative and innovative. As early as during graduate school, Xu Houze was influenced by this excellent style of study. According to him, as long as you enter the Academy of Sciences, you must do two things well: first, lay a good theoretical foundation; The second is to cultivate scientific research ability. Xu Houze began to study ellipsoidal geodesy and map projection at the beginning of postgraduate study. Under the guidance of Academician Fang Jun, he successively put forward the method of calculating the earth theme by using isobar and Gauss-Kruger projection. Later, Academician Fang Jun asked him to turn to gravity as his main subject. Therefore, in his graduation thesis, he pointed out that the gravity field in China is more complicated than that in the Soviet Union, and the calculation of the central area should be refined when processing astronomical gravity level data. The bipolar module was used to replace the elliptic hyperbolic module in Molodensky, which was realized on the computer for the first time, and was praised by the geodesy and Soviet experts at that time.
Academician Xu Houze has always been closely related to the tasks and challenges faced by geodesy. In the early 1960s, the calculation method of astronomical gravity grade was extended to the State Bureau of Surveying and Mapping through the same test and improvement as the National Surveying Team 1, and was included in the detailed rules of gravity calculation in the Bureau as one of the two operation modules. Subsequently, in order to understand the complex changes of topography and gravity field in mountainous areas of China, indirect interpolation method widely used now is proposed to replace astronomical gravity level and spatial anomaly, and a high-precision astronomical gravity level network is specially established to carry out experiments in mountainous areas of northwest Hubei. In the following years, he engaged in a lot of research work in military and space technology surveying and mapping support, and built the first global gravity field model centered on gravity data in China in 197 1 year. In the early 1980s, he studied the gravity assignment method of high-altitude disturbance, and together with his army comrades, he constructed a scheme to estimate the average gravity anomaly of 1× 1 in China, which was successfully applied to the national defense weapon test. In recent 10 years, he participated in the establishment of the National Gravity Network "85" system and the China Crustal Movement Monitoring Network as the technical director, and detected and discovered the gravity changes caused by the uplift of the Qinghai-Tibet Plateau and the coseismic deformation of the Lijiang earthquake in Yunnan.
Academician Xu Houze has also made a series of innovative achievements in the basic research of approximation theory of modern extraterrestrial gravity field. In 1963, he proposed the solution of the optimal approximation problem of the function in Weining Manez vertical deviation, and improved the authoritative Molokin approximation formula. Later, he further developed a unified approximation method for height anomalies and vertical deviations with boundary garden constraints and truncation error estimates. This achievement was reported at the 7th International Union of Geodesy and Geophysics (IUGG), which caused great repercussions in the international geodetic community. He also proposed a method to determine the gravity field outside the earth by using the virtual monolayer density of a regular sphere extending to the inside of the earth, which expanded the theory of Pierre Hammer in Sweden. The above research results won the third prize of National Natural Science Award of 1987 Institute of Geodesy.
Academician Xu Houze engaged in earthquake monitoring for six years in the mid-1970s, and was seconded to Beijing National Earthquake Analysis and Prediction Center. In order to eliminate the tidal influence in earthquake precursor observation, he began to study the solid tide and load deformation, and took the lead in developing a simple theoretical value algorithm of gravity tide in China and popularizing it. Later, under his leadership, he built the internationally advanced gravity tide datum in Wuchang, China, established the gravity tide profiles along the coast and east and west of China, and studied the calculation method of ocean load combining convolution with spherical function, especially his estimation of gravity tide correction accuracy, which is rare in the world. Together with his students, he developed a method to solve the equation of tidal motion of the earth by using perturbation series expansion, which is the most convenient theory of tidal deformation of the earth considering lateral inhomogeneity of mantle in the world. In the study of solid tide, together with scientists from other countries, he initiated and formulated the international research plan for observing geodynamics with superconducting gravimeter from 65438 to 0997. Up to now, nearly 20 superconducting gravimeters around the world are implementing this plan under the framework of the International Geodetic Society.
Since 1990s, he has led the analysis and research of satellite altimetry data, and made important progress in the study of sea level change trend, seabed topography inversion, and new structure discovery. In recent years, he devoted himself to the study of satellite gravity.
Academician Xu Houze's thought is always ahead of the times. He believes: "We should face the high-tech development in today's world, stand at the height of history and make choices that can stand the test of history. This is the future of interdisciplinary development." To this end, he has established cooperative relations with more than 20 foreign scientific research institutes and universities, strengthened discipline exchanges, and made a large number of young and middle-aged scientific and technological backbones stand out in interdisciplinary fields such as geodesy, geophysics and solid tide. Through cooperation and exchange, it is found that the latitude dependence of Wahr solid tide model recognized by IAU and IUGG is wrong. A unique small parameter perturbation method is developed, and new numerical results are given, which solves the international problems of zero reference plane drift and bow correction of Venus gravity field. In geophysics, the theoretical Q value of Zhang Dele's swing is accurately deduced for the first time in the world, and the crustal movement state in Himalayan region is studied.
Academician Xu Houze has successively served as the Executive Committee of the International Geodetic Association, the Chairman of the International Tide Committee, the Vice Chairman of the International Gravity Committee and the Editorial Board of the International Journal of Geodesy, which has attracted the attention and attention of international peers.
Academician Xu Houze is over 70 years old, but he still cares about the development of geodesy all the time. Recently, according to the spirit of Lu Yongxiang, President of China Academy of Sciences, who wrote an inscription to the Institute of Geodesy, "Serve the needs of the country and bravely climb the geodesic peak", he actively made suggestions and suggestions for the Institute: around crustal movement monitoring and geodynamics, mass distribution and migration of the earth system, internal dynamics of the deep earth, wetland ecological research, integration of geodetic observation technology and national needs, an innovative team was formed and the application of gravity, remote sensing and geographic information technology in national defense and environmental disaster monitoring, so as to realize the Institute.
Author: Yu Pingfan Liu Lintao Peng Fang