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Chih-Kung Jen was a Chinese physicist who emigrated to the U.S. and participated in some of the twentieth century's major scientific, political and social developments in both the United States and China. Born in a mud house in a remote and largely illiterate village in China, he was awarded a scholarship funded as a result of the Boxer Rebellion of the late 1800s to attend Beijing's prestigious Tsinghua University. As part of that scholarship, he came to the U.S. in 1926 to study electrical engineering and physics at MIT. He completed his graduate studies first at the University of Pennsylvania, and then in physics at Harvard University. Jen was among the first to provide experimental proof of the existence of the ionosphere. In addition, he obtained the first theoretically calculated value for the electron affinity spectrum of the hydrogen atom, a problem of fundamental significance in quantum mechanics and astrophysics. In 1937, Jen returned to China, and subsequently joined in the "Academic Long March" to set up a wartime refugee university in Kunming. His wartime teaching and research contributed to the training of what would become the nucleus of the present-day Chinese scientific intelligentsia. After the war, Jen returned to the Physics Department at Harvard, and eventually settled at the Applied Physics Laboratory at Johns Hopkins University to carry on pioneering research in trapping free radicals and other topics in microwave spectroscopy. In 1972, following Richard Nixon's visit to China, Jen led a ground-breaking delegation of Chinese American scientists to that country. The delegation conferred with Premier Zhou Enlai, and initiated what was to become a steady stream of scientific exchanges between the U.S. and China. Jen subsequently made numerous visits to China. He continued to work on strengthening U.S. -China scientific relations, and in addition was a leader in improving scientific education in Chinese universities.
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任之恭, 物理学家, 生于山西省沁源县。曾先后在北京清华大学、西南联合大学、美国哈佛大学、约翰·霍普金斯大学等担任教职并进行实验研究工作。 任之恭提供了电离层存在的最早的实验证据之一。他对于氢原子电离能谱的理论计算，在量子力学的早期发展中也有重要意义。他长期执教于清华大学和西南联合大学，在物理学、电机工程等领域为中国培养了大批人才。二战后，他于1946年出国研究，1955年留居美国，主要从事微波光谱学方面的研究工作。 1972年美国总统尼克松访华以后，任之恭为促进中美两国科学、教育、文化等方面的交流付出了极大努力，曾组织美籍华裔学者访华，先后会见过周恩来、邓小平等中国领导人。 以任之恭亲属的捐赠为基础，清华大学设立了“清华大学任之恭奖学金”，纪念任之恭先生对中国教育和科技事业的贡献，鼓励清华大学物理系学生勤奋学习。
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Chih-Kung Jen was a Chinese physicist who emigrated to the U.S. and participated in some of the twentieth century's major scientific, political and social developments in both the United States and China. Born in a mud house in a remote and largely illiterate village in China, he was awarded a scholarship funded as a result of the Boxer Rebellion of the late 1800s to attend Beijing's prestigious Tsinghua University. As part of that scholarship, he came to the U.S.
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Chih-Kung Jen
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任之恭
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Chinese educators
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