Brownian Ratchets

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Brownian Ratchets

Author : David Cubero
ISBN : 9781316538906
Genre : Science
File Size : 31.41 MB
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Illustrating the development of Brownian ratchets, from their foundations, to their role in the description of life at the molecular scale and in the design of artificial nano-machinery, this text will appeal to both advanced graduates and researchers entering the field. Providing a self-contained introduction to Brownian ratchets, devices which rectify microscopic fluctuations, Part I avoids technicalities and sets out the broad range of physical systems where the concept of ratchets is relevant. Part II supplies a single source for a complete and modern theoretical analysis of ratchets in regimes such as classical vs quantum and stochastic vs deterministic, and in Part III readers are guided through experimental developments in different physical systems, each highlighting a specific unique feature of ratchets. The thorough and systematic approach to the topic ensures that this book provides a complete guide to Brownian ratchets for newcomers and established researchers in physics, biology and biochemistry.
Category: Science

On Control Of Transport In Brownian Ratchet Mechanisms

Author :
ISBN : OCLC:1051903831
Genre :
File Size : 68.86 MB
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Abstract : Highlights: Systematic method to maximize velocity/efficiency of Brownian ratchets in open-loop. Quantitative estimation of pdf of transport and error bounds on back propagation. Optimal strategy to maximize efficiency in closed-loop for Brownian ratchets. Up to three times improvement in efficiency over open-loop method. Up to 35% improvement in efficiency over closed-loop methods that maximize velocity. Abstract: Engineered transport of material at the nano/micro scale is essential for the manufacturing platforms of the future. Unlike conventional transport systems, at the nano/micro scale, transport has to be achieved in the presence of fundamental sources of uncertainty such as thermal noise. Remarkably, it is possible to extract useful work by rectifying noise using an asymmetric potential; a principle used by Brownian ratchets. In this article a systematic methodology for designing open-loop Brownian ratchet mechanisms that optimize velocity and efficiency is developed. In the case where the particle position is available as a measured variable, closed loop methodologies are studied. Here, it is shown that methods that strive to optimize velocity of transport may compromise efficiency. A dynamic programming based approach is presented which yields up to three times improvement in efficiency over optimized open loop designs and 35% better efficiency over reported closed loop strategies that focus on optimizing velocities.


Author : Stanford University. Department of Chemistry
ISBN : STANFORD:36105020875923
Genre :
File Size : 56.26 MB
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Contains reprints of articles published by members of the department.

Noise And Fluctuations

Author : Tomás González
ISBN : UOM:39015062411114
Genre : Science
File Size : 43.83 MB
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All papers were peer-reviewed. ICNF covers a wide variety of topics on noise and fluctuations. Research activity on noise involves several quite different disciplines (physics, engineering, mathematics, biology, chemistry, signal theory, etc.) and requires both fundamental and technological scientific efforts. Advanced micro- and nanoelectronic devices and related circuites and applications, where noise constitutes a key performance limitation, is one of the fundamental interests.
Category: Science

Unsolved Problems Of Noise And Fluctuations

Author : Sergey M. Bezrukov
ISBN : 0735401276
Genre : Science
File Size : 46.61 MB
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All papers in this proceedings volume were peer reviewed. The purview of this third conference was shifted toward biology and medicine. Among the topics covered were: the constructive role of noise in the central nervous system, neuronal networks, and sensory transduction (hearing in humans, photo- and electroreception in marine animals), encoding of information into nerve pulse trains, single molecules and noise (including single molecule detection and characterization by nanopores - molecular "Coulter counting"), concepts of noise in neurophysiology (randomness and order in brain and heart electrical activities under normal conditions and in pathology), the role of noise in genetic regulation and gene expression, biosensors, etc.
Category: Science

Energy And Entropy

Author : Harvey S. Leff
ISBN : 9781000170344
Genre : Science
File Size : 33.65 MB
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Energy is typically regarded as understandable, despite its multiple forms of storage and transfer. Entropy, however, is an enigma, in part because of the common view that it represents disorder. That view is flawed and hides entropy’s connection with energy. In fact, macroscopic matter stores internal energy, and that matter’s entropy is determined by how the energy is stored. Energy and entropy are intimately linked. Energy and Entropy: A Dynamic Duo illuminates connections between energy and entropy for students, teachers, and researchers. Conceptual understanding is emphasised where possible through examples, analogies, figures, and key points. Features: Qualitative demonstration that entropy is linked to spatial and temporal energy spreading, with equilibrium corresponding to the most equitable distribution of energy, which corresponds to maximum entropy Analysis of energy and entropy of matter and photons, with examples ranging from rubber bands, cryogenic cooling, and incandescent lamps to Hawking radiation of black holes Unique coverage of numerical entropy, the 3rd law of thermodynamics, entropic force, dimensionless entropy, free energy, and fluctuations, from Maxwell's demon to Brownian ratchets, plus attempts to violate the second law of thermodynamics
Category: Science

The Cell S Design Reasons To Believe

Author : Fazale Rana
ISBN : 1441200932
Genre : Religion
File Size : 45.54 MB
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Armed with cutting-edge techniques, biochemists have unwittingly uncovered startling molecular features inside the cell that compel only one possible conclusion--a supernatural agent must be responsible for life. Destined to be a landmark apologetic work, The Cell's Design explores the full scientific and theological impact of these discoveries. Instead of focusing on the inability of natural processes to generate life's chemical systems (as nearly all apologetics works do), Fazale Rana makes a positive case for life's supernatural basis by highlighting the many biochemical features that reflect the Creator's hallmark signature. This breakthrough work extends the case for design beyond irreducible complexity. These never-before-discussed evidences for design will evoke awe and amazement at God's creative majesty in the remarkable elegance of the cell's chemistry.
Category: Religion


Author :
ISBN : UCLA:L0098874027
Genre : Electronic journals
File Size : 33.3 MB
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Category: Electronic journals

Physical Review

Author :
ISBN : UOM:39076002065642
Genre : Fluids
File Size : 23.84 MB
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Category: Fluids

Mathematical Reviews

Author :
ISBN : UOM:39015078588590
Genre : Mathematics
File Size : 69.33 MB
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Category: Mathematics