Jiajun Gu's Books

Metallic Butterfly Wing Scales

Superstructures with High Surface-Enhancement Properties for Optical Applications

By: Jiajun Gu,Di Zhang,Yongwen Tan

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Metallic Butterfly Wing Scales

Superstructures with High Surface-Enhancement Properties for Optical Applications

By: Jiajun Gu,Di Zhang,Yongwen Tan

This book presents a method for replicating natural butterfly wing scales using a variety of metals for state-of-the-art applications requiring high surface-enhancement properties. During the past decade, three dimensional (3D) sub-micrometer structures have attracted considerable attention for optical applications. These 3D subwavelength metallic structures are, however, difficult to prepare. By contrast, the 3D superstructures of butterfly wing scales, with more than 175 000 morphologies, are efficiently engineered by nature. Natural butterfly wing scales feature 3D sub-micrometer structures that are superior to many human designs in terms of structural complexity, reproducibility, and cost. Such natural wealth offers a versatile chemical route via the replication of these structures into functional metals. A single versatile chemical route can be used to produce butterfly scales in seven different metals. These synthesized structures have the potential for catalytic (Au, Pt, Pd), thermal (Ag, Au, Cu), electrical (Au, Cu, Ag), magnetic (Co, Ni), and optical (Au, Ag, Cu) applications. Plasmon-active Au, Cu, Ag butterfly scales have exhibited excellent properties in surface-enhanced Raman scattering (SERS). The Au scales as SERS substrates have ten times the analyte detection sensitivity and are one-tenth the cost of their human-designed commercial counterparts (KlariteTM). Preliminary mechanisms of these surface-enhancement phenomena are also reviewed.

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Springer

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ISBN 10

3319125354

ISBN 13

9783319125350

Manipulation of Sound Properties by Acoustic Metasurface and Metastructure

By: Jiajun Zhao

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Manipulation of Sound Properties by Acoustic Metasurface and Metastructure

By: Jiajun Zhao

This thesis focuses on the manipulation of sound properties by artificial materials. It elaborates on the fundamental design of acoustic metasurfaces and metastructures as the extension of metamaterials, and their functionality in the manipulation of sound properties. A broad and comprehensive guideline of designing acoustic metasurfaces and metastructures is also provided. Based on the proposed subwavelength metasurfaces and the metastructures with a simplified layout, multiple potential applications are demonstrated. This thesis will appeal to acoustic engineers and researchers who are interested in designing acoustic artificial structures.

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Springer

Published Date

ISBN 10

9811021252

ISBN 13

9789811021251

Text Data Mining

By: Chengqing Zong,Rui Xia,Jiajun Zhang

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Text Data Mining

By: Chengqing Zong,Rui Xia,Jiajun Zhang

This book discusses various aspects of text data mining. Unlike other books that focus on machine learning or databases, it approaches text data mining from a natural language processing (NLP) perspective. The book offers a detailed introduction to the fundamental theories and methods of text data mining, ranging from pre-processing (for both Chinese and English texts), text representation and feature selection, to text classification and text clustering. It also presents the predominant applications of text data mining, for example, topic modeling, sentiment analysis and opinion mining, topic detection and tracking, information extraction, and automatic text summarization. Bringing all the related concepts and algorithms together, it offers a comprehensive, authoritative and coherent overview. Written by three leading experts, it is valuable both as a textbook and as a reference resource for students, researchers and practitioners interested in text data mining. It can also be used for classes on text data mining or NLP.

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Page Count

363

Publisher

Springer Nature

Published Date

ISBN 10

9811601003

ISBN 13

9789811601002

Rock Mechanics and Engineering

Prediction and Control of Landslides and Geological Disasters

By: Helin Fu,Wei Chen,Jiajun Fu

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Rock Mechanics and Engineering

Prediction and Control of Landslides and Geological Disasters

By: Helin Fu,Wei Chen,Jiajun Fu

Rock Mechanics and Engineering: Prediction and Control of Landslides and Geological Disasters presents the state-of-the-art in monitoring and forecasting geotechnical hazards during the survey and design, construction, and operation of a railway. This volume offers the latest research and practical knowledge on the regularity of disaster-causing activities, and the monitoring and forecasting of rockfalls, landslides, and debris flow induced by rainfall and human activity. The book gives guidance on how to optimize railway design, prevent and control measures during construction, and geological hazard remediation. The book also advises engineers on how to achieve traffic safety on high-speed railways. Eleven chapters present best practices in the prediction and control of landslides and rockfalls in geological disasters, derived from years of geotechnical engineering research and practice on high-speed railways in China. High-speed railways bring characteristic geotechnical challenges including a complete maintenance system, a long railway line, and the subjection of the geological body to cyclic loads. Since the damage to the geological body is influenced by fatigue as well as rock and soil strength and hydrology, the study of geotechnical hazards to high-speed rail is very complex. Monitoring and predicting such hazards on high-speed railways is a significant challenge to their safe construction and operation. - Presents the latest technical achievement and development trends in landslide and rockfall forecasting - Considers the challenges of high-speed railways to the prediction and control of geotechnical hazards - Gives both in-situ and laboratory tests for rockfalls, and considers the collapse process of rock slopes - Describes the principles of slope monitoring with specific reference to high-speed rail - Details an automatic monitoring system for geotechnical hazards to high-speed rail

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Page Count

428

Publisher

Elsevier

Published Date

ISBN 10

0128224266

ISBN 13

9780128224267

Metallic Butterfly Wing Scales

Superstructures with High Surface-Enhancement Properties for Optical Applications

By: Jiajun Gu,Di Zhang,Yongwen Tan

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Metallic Butterfly Wing Scales

Superstructures with High Surface-Enhancement Properties for Optical Applications

By: Jiajun Gu,Di Zhang,Yongwen Tan

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N/A

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Solve jigsaw puzzle

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Publisher

Springer

Published Date

ISBN 10

3319125354

ISBN 13

9783319125350

Book's by Jiajun Gu

Metallic Butterfly Wing Scales

Metallic Butterfly Wing Scales

Manipulation of Sound Properties by Acoustic Metasurface and Metastructure

Manipulation of Sound Properties by Acoustic Metasurface and Metastructure

Text Data Mining

Text Data Mining

Rock Mechanics and Engineering

Rock Mechanics and Engineering

Metallic Butterfly Wing Scales

Metallic Butterfly Wing Scales

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