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Although the Right to Leave and Return (RLR) is a fundamental human right, each State has the sovereign right to regulate RLR in accordance with its own laws. In the case of China, the country's communist political system has significantly affected the development of RLR and the country's approach to it. As a rule, China's approach is restrictive. As part of its reform and 'opening up' policies, China has embarked on a range of reforms to liberalise RLR, but the reforms lack cohesion and focus, and remain restrictive. Given its past and its complex social and economic conditions, China may...

A treatment of silicon-germanium heterojunction bipolar transistors (SiGe HBT), a technology that is expected to revolutionise communications. It covers motivation, history, materials, fabrication, device physics, operational principles, and circuit-level properties associated with SiGe.