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Magnesium-Based Energy Storage Materials and Systems
by Jianxin Zou Yanna NuLi Zhigang Hu Xi Lin Qiuyu ZhangUnderstand the energy storage technologies of the future with this groundbreaking guide Magnesium-based materials have revolutionary potential within the field of clean and renewable energy. Their suitability to act as battery and hydrogen storage materials has placed them at the forefront of the world#s most significant research and technological initiatives. It has never been more essential that professionals working in energy storage and energy systems understand these materials and their extraordinary potential applications. Magnesium-Based Energy Storage Materials and Systems provides a thorough introduction to advanced Magnesium (Mg)-based materials, including both Mg-based hydrogen storage and Mg-based batteries. Offering both foundational knowledge and practical applications, including step-by-step device design processes, it also highlights interactions between Mg-based and other materials. The result is an indispensable guide to a groundbreaking set of renewable energy resources. Magnesium-Based Energy Storage Materials and Systems readers will also find: In-depth analysis of the effects of employing catalysts, nano-structuring Magnesium-based materials, and many more subjects Detailed discussion of electrolyte, cathode, and anode materials for Magnesium batteries Snapshots of in-progress areas of research and development Magnesium-Based Energy Storage Materials and Systems is ideal for materials scientists, inorganic chemists, solid state chemists, electrochemists, and chemical engineers.
High-Energy-Density Fuels for Advanced Propulsion: Design and Synthesis
by Ji-Jun Zou Xiangwen Zhang Lun PanCovers the theory and practice of designing, synthesizing, and improving the performance of fuels This book provides readers with the fundamentals on high-energy-density fuels and their potential in advanced aerospace propulsion. It comprehensively and systematically demonstrates both the theory and practice of creating, processing, and refining the performance of fuels, all while connecting the past, present, and future of fuel chemistry and technology. It covers a wide range of fuels including polycyoalkane fuels, strained fuels, alky-diamondoid fuels, and hypergolic and nanofluid fuels derived from fossil and biomass. It also describes the important aspects of high-energy-density (HED) fuels, including molecular design, synthesis route, physiochemical properties, and their application in improving aircraft performance. In addition, the book features vivid schematics and illustrations throughout to enhance accessibility to the relevant theory and technologies. High-Energy-Density Fuels for Advanced Propulsion begins by introducing readers to the topic before delving into the development history and basics of aerospace fuels. It discusses the general properties and requirements of aerospace fuels, as well as the overall development. The book also covers the design and synthesis of green hypergolic liquid fuels, the formulation and synthesis of gelled fuels, the combustion properties of fuels and the methods for improving them, and more. A much-needed, complete overview of an important topic on fuel chemistry and technology for a range of fuels, including aerospace propulsion technology Provides readers with inspirations for new development of advanced aerospace fuels Discusses how HED fuels can improve the performance of aircraft Offers chapters covering fuels such as polycyoalkane, strained, alky-diamondoid, hypergolic, and nanofluid fuels High-Energy-Density Fuels for Advanced Propulsion is an excellent resource for those working in the fields of fuel chemistry, fuel technology, and aerospace propulsion technology, and is an ideal reference book for researchers, engineers, and students majoring in chemical science and engineering, mechanical engineering, and aerospace engineering.
Communication-Protocol-Based Filtering and Control of Networked Systems (Studies in Systems, Decision and Control #430)
by Lei Zou Zidong Wang Jinling LiangCommunication-Protocol-Based Filtering and Control of Networked Systems is a self-contained treatment of the state of the art in communication-protocol-based filtering and control; recent advances in networked systems; and the potential for application in sensor networks. This book provides new concepts, new models and new methodologies with practical significance in control engineering and signal processing. The book first establishes signal-transmission models subject to different communication protocols and then develops new filter design techniques based on those models and preset requirements for filtering performance. The authors then extend this work to finite-horizon H-infinity control, ultimately bounded control and finite-horizon consensus control. The focus throughout is on three typical communications protocols: the round-robin, random-access and try-once-and-discard protocols, and the systems studied are drawn from a variety of classes, among them nonlinear systems, time-delayed and time-varying systems, multi-agent systems and complex networks. Readers are shown the latest techniques—recursive linear matrix inequalities, backward recursive difference equations, stochastic analysis and mapping methods. The unified framework for communication-protocol-based filtering and control for different networked systems established in the book will be of interest to academic researchers and practicing engineers working with communications and other signal-processing systems. Senior undergraduate and graduate students looking to increase their knowledge of current methods in control and signal processing of networked systems will also find this book valuable.
Strategic Safety Management in Construction and Engineering
by Patrick Zou Riza Yosia SunindijoAlthough the construction and engineering sector makes important contributions to the economic, social, and environmental objectives of a nation, it has a notorious reputation for being an unsafe industry in which to work. Despite the fact that safety performance in the industry has improved, injuries and fatalities still occur frequently. To address this, the industry needs to evolve further by integrating safety into all decision making processes. Strategic Safety Management in Construction and Engineering takes a broad view of safety from a strategic decision making and management perspective with a particular focus on the need to balance and integrate 'science' and 'art' when implementing safety management. The principles covered here include the economics of safety, safety climate and culture, skills for safety, safety training and learning, safety in design, risk management, building information modelling, and safety research methods and the research-practice nexus. They are integrated into a strategic safety management framework which comprises strategy development, implementation, and evaluation. Practical techniques are included to apply the principles in the context of the construction and engineering industry and projects. Case studies are also provided to demonstrate the localised context and applications of the principles and techniques in practice.
Research Methodology and Strategy: Theory and Practice
by Patrick X. Zou Xiaoxiao XuResearch Methodology and Strategy Provides comprehensive coverage of the entire research process, ideal for advanced students and professionals Research Methodology and Strategy: Theory and Practice is designed to help advanced students understand the research process and equip them with the skills required to successfully execute their projects. In-depth chapters describe the general research processes, different research paradigms and their application domains, the role of criticism, and more. Written by authors with decades of research experience, this authoritative textbook addresses the skills needed by all active researchers, including mixed method research design and development, data- and technology-driven research methodologies, writing and publishing research outcomes, strengthening research-practice nexus and strategies for improving research impact and citations. Provides a solid understanding of interdisciplinary research and analytical methods Offers clear guidance on the application of data-driven and technology-enabled research methods Covers qualitative, quantitative and mixed methods research methodologies Discusses different case study research methods and practices Describes methods drawn from business, management, economics, and social sciences research Provides strategies for thesis and journal article writing and publishing Provides theoretical frameworks and examples for research-practice nexus and improving research impacts Research Methodology and Strategy: Theory and Practice is an invaluable textbook for senior undergraduate, masters, and PhD research students, academic and scientific researchers, and industry professionals who perform research in the course of their work.
Laser Shock Peening: Fundamentals and Advances
by Shikun Zou Junfeng Wu Ziwei Cao Zhigang CheThis book highlights the fundamentals and latest progresses in the research and applications of laser shock peening (LSP). As a novel technology for surface treatment, LSP greatly improves the resistance of metallic materials to fatigue and corrosion. The book presents the mechanisms, techniques, and applications of LSP in a systematic way. It discusses a series of new progresses in fatigue performance improvement of metal parts with LSP. It also introduces lasers, equipment, and techniques of newly developed industry LSP, with a detailed description of the novel LSP blisk. The book demonstrates in details numerical analysis and simulation techniques and illustrates process stability control, quality control, and analysis determination techniques. It is a valuable reference for scientists, engineers, and students in the fields of laser science, materials science, astronautics, and aeronautics who seek to understand, develop, and optimize LSP processes.
Nondestructive Measurement in Food and Agro-products
by Xiaobo Zou Jiewen ZhaoThis book is composed of 8 chapters, each focusing on a major non-destructive technique, including optical, acoustic and biological methods. The content of each chapter is based on the author's studies and current research developments. The book is aimed at graduate students, senior undergraduate students, and researchers in academia and industry. It will be particularly interesting for researchers in the fields of food, agricultural engineering, biotechnology and applied mathematics. It will also serve as a useful reference source for people working in the design and manufacture of non-destructive devices for food and agricultural products.
Microporous Materials for Separation Membranes
by Xiaoqin Zou Guangshan ZhuA guide to membrane separation based on a variety of porous materials with promising separation applications Microporous Materials for Separation Membranes offers an in-depth guide that explores microporous materials? potential for membrane applications. The authors?two experts on the topic?examine a wide range of porous materials that have application potential including: microporous silica, porous carbons, zeolites, metal-organic frameworks (MOFs), and porous organic frameworks (POFs). Comprehensive in scope, the book covers a broad range of topics on membrane separations such as: hydrogen recovery, carbon dioxide capture, air purification, hydrocarbon separation, pervaporation, and water treatment. In addition, this up-to-date resource explores the most recent materials for preparing microporous membranes and explores the most promising applications for industrial use. This important book: -Examines the use of microporous materials as membranes to perform with different gases and liquids -Offers an overview of the basic knowledge of membrane separation and an intense examination of separations -Describes the state-of-the-art of membrane separation with porous materials -Highlights the most promising applications of industrial interest Written for scientists working in the fields of membranes, gas and liquid, Microporous Materials for Separation Membranes offers a valuable guide to the potential of microporous materials for membrane applications.
Classification, Parameter Estimation and State Estimation: An Engineering Approach Using MATLAB
by Yaobin Zou Ming Feng Guangzhu Xu Ferdinand van der Heijden Dick De Ridder David M. Tax Bangjun LeiA practical introduction to intelligent computer vision theory, design, implementation, and technology The past decade has witnessed epic growth in image processing and intelligent computer vision technology. Advancements in machine learning methods—especially among adaboost varieties and particle filtering methods—have made machine learning in intelligent computer vision more accurate and reliable than ever before. The need for expert coverage of the state of the art in this burgeoning field has never been greater, and this book satisfies that need. Fully updated and extensively revised, this 2nd Edition of the popular guide provides designers, data analysts, researchers and advanced post-graduates with a fundamental yet wholly practical introduction to intelligent computer vision. The authors walk you through the basics of computer vision, past and present, and they explore the more subtle intricacies of intelligent computer vision, with an emphasis on intelligent measurement systems. Using many timely, real-world examples, they explain and vividly demonstrate the latest developments in image and video processing techniques and technologies for machine learning in computer vision systems, including: PRTools5 software for MATLAB—especially the latest representation and generalization software toolbox for PRTools5 Machine learning applications for computer vision, with detailed discussions of contemporary state estimation techniques vs older content of particle filter methods The latest techniques for classification and supervised learning, with an emphasis on Neural Network, Genetic State Estimation and other particle filter and AI state estimation methods All new coverage of the Adaboost and its implementation in PRTools5. A valuable working resource for professionals and an excellent introduction for advanced-level students, this 2nd Edition features a wealth of illustrative examples, ranging from basic techniques to advanced intelligent computer vision system implementations. Additional examples and tutorials, as well as a question and solution forum, can be found on a companion website.
Distributed Cooperative Model Predictive Control of Networked Systems
by Yuanyuan Zou Shaoyuan LiThis book is inspired by the development of distributed model predictive control of networked systems to save computation and communication sources. The significant new contribution is to show how to design efficient DMPCs that can be coordinated asynchronously with the increasing effectiveness of the event-triggering mechanism and how to improve the event-triggered DMPC for different requirements improvement of control performance, extension to interconnected networked systems, etc. The book is likely to be of interest to the persons who are engaged in researching control theory in academic institutes, the persons who go in for developing control systems in R&D institutes or companies, the control engineers who are engaged in the implementation of control algorithms, and people who are interested in the distributed MPC.
Physical-Layer Security for Cooperative Relay Networks
by Yulong Zou Jia ZhuThis book presents physical-layer security as a promising paradigm for achieving the information-theoretic secrecy required for wireless networks. It explains how wireless networks are extremely vulnerable to eavesdropping attacks and discusses a range of security techniques including information-theoretic security, artificial noise aided security, security-oriented beamforming, and diversity assisted security approaches. It also provides an overview of the cooperative relaying methods for wireless networks such as orthogonal relaying, non-orthogonal relaying, and relay selection. Chapters explore the relay-selection designs for improving wireless secrecy against eavesdropping in time-varying fading environments and a joint relay and jammer selection for wireless physical-layer security, where a relay is used to assist the transmission from the source to destination and a friendly jammer is employed to transmit an artificial noise for confusing the eavesdropper. Additionally, the security-reliability tradeoff (SRT) is mathematically characterized for wireless communications and two main relay-selection schemes, the single-relay and multi-relay selection, are devised for the wireless SRT improvement. In the single-relay selection, only the single best relay is chosen for assisting the wireless transmission, while the multi-relay selection invokes multiple relays for simultaneously forwarding the source transmission to the destination. Physical-Layer Security for Cooperative Relay Networks is designed for researchers and professionals working with networking or wireless security. Advanced-level students interested in networks, wireless, or privacy will also find this book a useful resource.
Axial Turbine Aerodynamics for Aero-engines: Flow Analysis and Aerodynamics Design
by Zhengping Zou Songtao Wang Huoxing Liu Weihao ZhangThis book is a monograph on aerodynamics of aero-engine gas turbines focusing on the new progresses on flow mechanism and design methods in the recent 20 years. Starting with basic principles in aerodynamics and thermodynamics, this book systematically expounds the recent research on mechanisms of flows in axial gas turbines, including high pressure and low pressure turbines, inter-turbine ducts and turbine rear frame ducts, and introduces the classical and innovative numerical evaluation methods in different dimensions. This book also summarizes the latest research achievements in the field of gas turbine aerodynamic design and flow control, and the multidisciplinary conjugate problems involved with gas turbines. This book should be helpful for scientific and technical staffs, college teachers, graduate students, and senior college students, who are involved in research and design of gas turbines.
Robust Statistics for Signal Processing
by Abdelhak M. Zoubir Visa Koivunen Esa Ollila Michael MumaUnderstand the benefits of robust statistics for signal processing with this authoritative yet accessible text. The first ever book on the subject, it provides a comprehensive overview of the field, moving from fundamental theory through to important new results and recent advances. Topics covered include advanced robust methods for complex-valued data, robust covariance estimation, penalized regression models, dependent data, robust bootstrap, and tensors. Robustness issues are illustrated throughout using real-world examples and key algorithms are included in a MATLAB Robust Signal Processing Toolbox accompanying the book online, allowing the methods discussed to be easily applied and adapted to multiple practical situations. This unique resource provides a powerful tool for researchers and practitioners working in the field of signal processing.
A Concise Guide To Intraoperative Monitoring
by George Zouridakis Andrew PapanicolaouCovering both the applications and the related theory, A Concise Guide to Intraoperative Monitoring provides a general but comprehensive introduction to IOM. Unlike existing texts that typically report the results of specific studies, this book presents comprehensive coverage of the entire procedure, as well as the specific protocols used in hospital practice, examples of typical recordings, possible problems, and recommended solutions. At the end of each chapter the author poses several questions for review. These questions help technologists and medical residents in their preparation for the board exams. Taken together, these features make the book an ideal reference or training manual. <p><p> A Concise Guide to Intraoperative Monitoring begins by discussing the basic principles underlying the generation of bioelectrical signals. It then describes the electronic equipment and the various electrophysiological procedures involved in IOM. From this foundation, the book gradually advances to more specific topics, such as surgical procedures, neuronal structures at risk, the optimum combinations of tests to administer, and the proper interpretation of test results. The material also provides you with a background on general anesthesia and analyzes the effects of various drugs on electrophysiological recordings. A Concise Guide to Intraoperative Monitoring also discusses the proper placement of stimulation and recording electrodes, as well as intervention strategies and equipment troubleshooting.
Recognition Receptors in Biosensors
by Mohammed ZourobThis book will cover most of the up-to-date recognition receptors technologies used in biosensors. Since this book is written by the world's most renowned and learned scientists in their own area of expertise, we believe that the calibre of the finished product will be as renowned as their reputation. To the best of the editor and author's knowledge this book is a first in this field. We will aim to cover this increasingly hot area of research especially in relation to the new biosensing techniques. Most of the universities are teaching the recognition receptors topics in the Biosensors, separation and Microsystems courses. However, there is no single reference book that covers this interesting area. So the aim of this book is to be a textbook for the undergraduate and graduate student upwards, and an important reference for the professionals working in different fields including biomedical, natural sciences, physical sciences, and nanotechnology, m-TAS, veterinary, food QA, bioterrorism and security as well as health surveillance. The book will cover the different recognition receptors used up-to-date in the different sensing transducer and microarrays platforms. It will cover the background, theory behind each technology, state-of-the-art review for all the new technologies used in biosensing in detail. Strategies and future prospectus are suggested at the end of each chapter for developing future technologies to achieving a better sensitivity, stability and swifter biosensing detection.
Optical Guided-wave Chemical and Biosensors I
by Mohammed Zourob Akhlesh LakhtakiaFor the first time, distinguished scientists from key institutions worldwide provide a comprehensive approach to optical sensing techniques employing the phenomenon of guided wave propagation for chemical and biosensors. This includes both state-of the-art fundamentals and innovative applications of these techniques. The authors present a deep analysis of their particular subjects in a way to address the needs of novice researchers such as graduate students and post-doctoral scholars as well as of established researchers seeking new avenues. Researchers and practitioners who need a solid foundation or reference will find this work invaluable. This first of two volumes contains eight chapters covering planar waveguides for sensing, as well as sensing techniques based on plasmonic waveguides.
Functional Thin Films and Nanostructures for Sensors
by Anis Zribi Jeffrey FortinThis book discusses advances in functional thin films for sensors and novel concepts for future breakthroughs. The focus is on guidelines and design rules for sensor systems, interaction between functional thin films and other sensor subsystems, fundamentals behind the intrinsic functionality in sensing thin films and nanostructures, state-of-the-art technologies used to develop sensors today and concrete examples of sensor designs.
Functional Processing of Delta-Sigma Bit-Stream
by Djuro G. ZrilicThis book discusses non-conventional digital signal processing based on direct processing of delta-sigma modulated bit-stream. The main attributes of low-pass delta-sigma analog-to-digital converters are: simple and inexpensive design, robustness of design to component tolerances, low-power consumption, high input impedance, high resolution (more than 20 bits) and possibility of direct arithmetic operation on its bit-stream. The author presents a number of theoretical and simulation results related to newly proposed linear and non-linear circuits such as delta-sigma adders, delta-sigma rectifiers, delta-sigma RMS and AGC circuits, delta-sigma frequency deviation meters, etc. The proposed circuits are not application limited and can be used in instrumentation, sensor application, bio-medical application, communications, etc.Presents novel linear and nonlinear circuits for direct processing of delta-sigma modulated bit-stream;The proposed circuits are supported by theoretical and simulation results;Recommends potential applications of the proposed circuits, and proposes ideas for further investigation.
Naturalistic Decision Making (Expertise: Research and Applications Series)
by Caroline E. Zsambok Gary KleinIf you aren't using the term naturalistic decision making, or NDM, you soon will be. Even as a very young field, NDM has already had far-reaching applications in areas as diverse as management, aviation, health care, nuclear power, military command and control, corporate teamwork, and manufacturing. Put simply, NDM is the way people use their experience to make decisions in the context of a job or task. Of particular interest to NDM researchers are the effects of high-stake consequences, shifting goals, incomplete information, time pressure, uncertainty, and other conditions that are present in most of today's work places and that add to the complexity of decision making. Applications of NDM research findings target decision aids and training that help people in their decision-making processes. This book reports the findings of top NDM researchers, as well as many of their current applications. In addition, the book offers a historical perspective on the emergence of this new paradigm, describes recent theoretical and methodological advancements, and points to future developments. It was written for people interested in decision making research and applications relative to a diverse array of work settings and products such as human-computer interfaces, decision support systems, individual and team training, product designs, and organizational development and planning.
Advanced Interconnects for ULSI Technology
by Ehrenfried Zschech Mikhail Baklanov Paul S. HoFinding new materials for copper/low-k interconnects is critical to the continuing development of computer chips. While copper/low-k interconnects have served well, allowing for the creation of Ultra Large Scale Integration (ULSI) devices which combine over a billion transistors onto a single chip, the increased resistance and RC-delay at the smaller scale has become a significant factor affecting chip performance.Advanced Interconnects for ULSI Technology is dedicated to the materials and methods which might be suitable replacements. It covers a broad range of topics, from physical principles to design, fabrication, characterization, and application of new materials for nano-interconnects, and discusses:Interconnect functions, characterisations, electrical properties and wiring requirements Low-k materials: fundamentals, advances and mechanical properties Conductive layers and barriers Integration and reliability including mechanical reliability, electromigration and electrical breakdown New approaches including 3D, optical, wireless interchip, and carbon-based interconnects Intended for postgraduate students and researchers, in academia and industry, this book provides a critical overview of the enabling technology at the heart of the future development of computer chips.
Electromagnetic Fields and Waves in Fractional Dimensional Space
by Muhammad Zubair Qaisar Abbas Naqvi Muhammad Junaid MughalThis book presents the concept of fractional dimensional space applied to the use of electromagnetic fields and waves. It provides demonstrates the advantages in studying the behavior of electromagnetic fields and waves in fractal media. The book presents novel fractional space generalization of the differential electromagnetic equations is provided as well as a new form of vector differential operators is formulated in fractional space. Using these modified vector differential operators, the classical Maxwell's electromagnetic equations are worked out. The Laplace's, Poisson's and Helmholtz's equations in fractional space are derived by using modified vector differential operators.
Carbon Footprint and the Industrial Life Cycle: From Urban Planning to Recycling (Green Energy and Technology)
by Sergio Zubelzu Roberto Álvarez Fernández Rodrigo MartínezThis book analyzes the relationship between large-scale industrial activity and the carbon footprint, and provides a theoretical framework and tools to calculate the carbon footprint of industrial activities at every stage of their life cycles, including urban-planning master plans, recycling activities, project and building stages as well as managing and manufacturing. Discussing the main preventative and corrective measures that can be utilized, it includes case studies, reports on technological developments and examples of successful policies to provide inspiration to readers. This book collects the contributions of authors from four continents, in order to analyze from as many as possible points of view and using many different approaches, the problem of sustainability in today's globalized world.
The Age of Surveillance Capitalism: The Fight for a Human Future at the New Frontier of Power
by Shoshana ZuboffThe challenges to humanity posed by the digital future, the first detailed examination of the unprecedented form of power called "surveillance capitalism," and the quest by powerful corporations to predict and control our behavior. <P><P>Shoshana Zuboff's interdisciplinary breadth and depth enable her to come to grips with the social, political, business, and technological meaning of the changes taking place in our time. We are at a critical juncture in the confrontation between the vast power of giant high-tech companies and government, the hidden economic logic of surveillance capitalism, and the propaganda of machine supremacy that threaten to shape and control human life. <P><P>Will the brazen new methods of social engineering and behavior modification threaten individual autonomy and democratic rights and introduce extreme new forms of social inequality? Or will the promise of the digital age be one of individual empowerment and democratization? <P><P>The Age of Surveillance Capitalism is neither a hand-wringing narrative of danger and decline nor a digital fairy tale. Rather, it offers a deeply reasoned and evocative examination of the contests over the next chapter of capitalism that will decide the meaning of information civilization in the twenty-first century. The stark issue at hand is whether we will be the masters of information and machines or its slaves.
The Case for Space: How the Revolution in Spaceflight Opens Up a Future of Limitless Possibility
by Robert ZubrinA noted space expert explains the current revolution in spaceflight, where it leads, and why we need it.A new space race has begun. But the rivals in this case are not superpowers but competing entrepreneurs. These daring pioneers are creating a revolution in spaceflight that promises to transform the near future. Astronautical engineer Robert Zubrin spells out the potential of these new developments in an engrossing narrative that is visionary yet grounded by a deep understanding of the practical challenges.Fueled by the combined expertise of the old aerospace industry and the talents of Silicon Valley entrepreneurs, spaceflight is becoming cheaper. The new generation of space explorers has already achieved a major breakthrough by creating reusable rockets. Zubrin foresees more rapid innovation, including global travel from any point on Earth to another in an hour or less; orbital hotels; moon bases with incredible space observatories; human settlements on Mars, the asteroids, and the moons of the outer planets; and then, breaking all limits, pushing onward to the stars.Zubrin shows how projects that sound like science fiction can actually become reality. But beyond the how, he makes an even more compelling case for why we need to do this--to increase our knowledge of the universe, to make unforeseen discoveries on new frontiers, to harness the natural resources of other planets, to safeguard Earth from stray asteroids, to ensure the future of humanity by expanding beyond its home base, and to protect us from being catastrophically set against each other by the false belief that there isn't enough for all.
Not All Dead White Men: Classics and Misogyny in the Digital Age
by Donna ZuckerbergSome of the most controversial and consequential debates about the legacy of the ancients are raging not in universities but online, where alt-right men’s groups deploy ancient sources to justify misogyny and a return of antifeminist masculinity. Donna Zuckerberg dives deep to take a look at this unexpected reanimation of the Classical tradition.