The unprecedented growth of cities and towns around the world, coupled with the unknown effects of global change, has created an urgent need to increase ecological understanding of human settlements, in order to develop inhabitable, sustainable cities and towns in the future. Although there is a wealth of knowledge regarding the understanding of human organisation and behaviour, there is comparably little information available regarding the ecology of cities and towns. This book brings together leading scientists, landscape designers and planners from developed and developing countries around the world, to explore how urban ecological research has been undertaken to date, what has been learnt, where there are gaps in knowledge, and what the future challenges and opportunities are.
This unique title allows budding young engineers, architects, and designers to use their personal creativity to design communities and their spaces. Through engaging photographs, clear explanations, and realistic activities, readers will be inspired to design parks and other elements that make communities enjoyable and accessible for all people. Opportunities to take plans from paper to screen build digital skills, making projects diverse and multi-level for all types of readers.
Matching Properties of Deep Sub-Micron MOS Transistors examines this interesting phenomenon. Microscopic fluctuations cause stochastic parameter fluctuations that affect the accuracy of the MOSFET. For analog circuits this determines the trade-off between speed, power, accuracy and yield. Furthermore, due to the down-scaling of device dimensions, transistor mismatch has an increasing impact on digital circuits. The matching properties of MOSFETs are studied at several levels of abstraction:
A simple and physics-based model is presented that accurately describes the mismatch in the drain current. The model is illustrated by dimensioning the unit current cell of a current-steering D/A converter.
The most commonly used methods to extract the matching properties of a technology are bench-marked with respect to model accuracy, measurement accuracy and speed, and physical contents of the extracted parameters.
The physical origins of microscopic fluctuations and how they affect MOSFET operation are investigated. This leads to a refinement of the generally applied 1/area law. In addition, the analysis of simple transistor models highlights the physical mechanisms that dominate the fluctuations in the drain current and transconductance.
The impact of process parameters on the matching properties is discussed.
The impact of gate line-edge roughness is investigated, which is considered to be one of the roadblocks to the further down-scaling of the MOS transistor.
Matching Properties of Deep Sub-Micron MOS Transistors is aimed at device physicists, characterization engineers, technology designers, circuit designers, or anybody else interested in the stochastic properties of the MOSFET.
Designer Vaccines: Principles for Successful Prophylaxis seeks answers to these important questions and explores how immunological knowledge can be applied in the formulation and delivery of vaccines. Instead of focusing on the rating of existing vaccines, this forward-thinking text looks to how new vaccines can be developed and existing ones improved upon. The book provides sound immunological theory and fact as a basis for solving vaccine design problems.
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