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In this Element, the gas-particle flow problem is formulated with momentum and thermal slip that introduces two relaxation times. Starting from acoustical propagation in a medium in equilibrium, the relaxation-wave equation in airfoil coordinates is derived though a Galilean transformation for uniform flow. Steady planar small perturbation supersonic flow is studied in detail according to Whitham's higher-order waves. The signals owing to wall boundary conditions are damped along the frozen-Mach wave, and are both damped and diffusive along an effective-intermediate Mach wave and diffusive along the equilibrium Mach wave where the bulk of the disturbance propagates. The surface pressure coefficient is obtained exactly for small-disturbance theory, but it is considerably simplified for the small particle-to-gas mass loading approximation, equivalent to a simple-wave approximation. Other relaxation-wave problems are discussed. Martian dust-storm properties in terms of gas-particle flow parameters are estimated.
The Hippodrome of Constantinople was constructed in the fourth century AD, by the Roman Emperor Constantine I, in his new capital. Throughout Byzantine history the Hippodrome served as a ceremonial, sportive and recreational center of the city; in the early period, it was used mainly as an arena for very popular, competitive, and occasionally violent chariot races, while the Middle Ages witnessed the imperial ceremonies coming to the fore gradually, although the races continued. The ceremonial and recreational role of the Hippodrome somehow continued during the Ottoman period. Being the oldest structure in the city, the Hippodrome has witnessed exciting chariot races, ceremonies glorifying victorious emperors as well as the charioteers, and the riots that shook the imperial authority. Today, looking to the remnants of the Hippodrome, one can imagine the glorious past of the site.
This Element in the Cambridge Elements in Second Language Acquisition series examines the role of interaction in Second Language Acquisition research, with a focus on the cognitive interactionist approach. The Element describes the major branches of the field, considering the importance of conversational interaction in both the cognitive interactionist framework as well as in sociocultural approaches to second language learning. The authors discuss the key concepts of the framework, including input, negotiation for meaning, corrective feedback, and output. The key readings in the field and the emphases of current and future research are explained. Finally, the authors describe the pedagogical implications that the cognitive interactionist approach has had on the teaching of second languages.
Entrepreneurship underpins many roles within the publishing industry, from freelancing to bookselling. Entrepreneurs are shaped by the contexts in which their entrepreneurship is situated (social, political, economic, and national). Additionally, entrepreneurship is integral to occupational identity for book publishing entrepreneurs. This Element examines entrepreneurship through the lens of identity and narrative based on interview data with book publishing entrepreneurs in the US Book publishing entrepreneurship narratives of independence, culture over commerce, accidental profession, place, risk, (in)stability, busyness, and freedom are examined in this Element.
This Element explores the potential in Judaism to incite Jews to engage in violence against non-Jews. The analysis proceeds in historical fashion, with sections devoted to the Hebrew Bible, rabbinic Judaism, medieval and early modern Judaism, and modern Zionism. The last topic is given special attention because of its relevance to the current Middle East conflict. This Element also draws on insights from social psychology to explain Jewish violence - particularly Social Identity Theory.
Building on a deep theoretical foundation and drawing on numerous examples, we examine how policies spread across the American states. We argue that for good policies to spread while bad policies are pushed aside, states must learn from one another. The three ingredients for this positive outcome are observable experiments, time to learn, and favorable incentives and expertise among policymakers. Although these ingredients are sometimes plentiful, we also note causes for concern, such as when policies are complex or incompatible with current practices, when policymakers give in to underlying political biases, or when political institutions lack the capacity for cultivating expertise. Under such conditions, states may rely on competition, imitation, and coercion, rather than learning, which can allow bad policies, rather than good ones, to spread. We conclude with lessons for reformers and policymakers and an assessment of our overall argument based on state responses to the COVID-19 pandemic.
This Element serves as a welcome to the Cambridge Elements Genetics in Epilepsy series. The series editors look forward to sharing with you the story of epilepsy genetics through a series of Elements. They will bring together many voices, by text as well as video, to illustrate the history of epilepsy genetics, the many on-going efforts in the field, and how they hope to address the still unanswered questions that command the attention of all of us and our colleagues across the globe.
In the past decades cultural heritage stored at museums and archives has been returned to source communities in various forms and under diverse circumstances. This contribution to the Elements series explores and discusses specifically the return of digital 'ethnographic' images to indigenous and non indigenous people that share a common recent history of coexistence and dispute over the same territory that is to be understood in the light of the consolidation of a Nation State with a settler colonial logic. The author argues that the affective reception of what a given archive labels as tangible and intangible heritage varies according to each audience´s particular memory practices, historical experience and way of relating to shared hegemonic notions of 'whiteness' and 'indigeneity'.
This Element provides a basic introduction to sentiment analysis, aimed at helping students and professionals in corpus linguistics to understand what sentiment analysis is, how it is conducted, and where it can be applied. It begins with a definition of sentiment analysis and a discussion of the domains where sentiment analysis is conducted and used the most. Then, it introduces two main methods that are commonly used in sentiment analysis known as supervised machine-learning and unsupervised learning (or lexicon-based) methods, followed by a step-by-step explanation of how to perform sentiment analysis with R. The Element then provides two detailed examples or cases of sentiment and emotion analysis, with one using an unsupervised method and the other using a supervised learning method.
The words 'Anthropocene animals' conjure pictures of dead albatrosses' bodies filled with plastic fragments, polar bears adrift on melting ice sheets, solitary elephants in the savannah. Suspended between the impersonal nature of the Great Extinction and the singularity of exotic individuals, these creatures appear remote, disconnected from us. But animals in the Anthropocene are not simply 'out there.' Threatening and threatened, they populate cities and countryside, often trapped in industrial farms, zoos, labs. Among them, there are humans, too. Italo Calvino's Animals explores Anthropocene animals through the visionary eyes of a classic modern author. In Calvino's stories, ants, cats, chickens, rabbits, gorillas, and other critters emerge as complex subjects and inhabitants of a world under siege. Beside them, another figure appears in the mirror: that of an anthropos without a capital A, epitome of subaltern humans with their challenges and inequalities, a companion species on the difficult path of co-evolution.
Molybdenum (Mo) is a widely used trace metal for investigating redox conditions. However, unanswered questions remain that concentration and bulk isotopic analysis cannot specially answer. Improvements can be made by combining new geochemical techniques to traditional methods of Mo analysis. In this Element, we propose a refinement of Mo geochemistry within aquatic systems, ancient rocks, and modern sediments through molecular geochemistry (systematically combining concentration, isotope ratio, elemental mapping, and speciation analyses). Specifically, to intermediate sulfide concentrations governing Mo behavior below the 'switch-point' and dominant sequestration pathways in low oxygen conditions. The aim of this work is to 1) aid and improve the breadth of Mo paleoproxy interpretations by considering Mo speciation and 2) address outstanding research gaps concerning Mo systematics (cycling, partitioning, sequestration, etc.). The Mo paleoproxy has potential to solve ever complex research questions. By using molecular geochemical recommendations, improved Mo paleoproxy interpretations and reconstruction can be achieved.
Debates concerning the units and levels of selection have persisted for over fifty years. One major question in this literature is whether units and levels of selection are genuine, in the sense that they are objective features of the world, or merely reflect the interests and goals of an observer. Scientists and philosophers have proposed a range of answers to this question. This Element introduces this literature and proposes a novel contribution. It defends a realist stance and offers a way of delineating genuine levels of selection by invoking the notion of a functional unit.
In Section 1, I outline the history of natural law theory, covering Plato, Aristotle, the Stoics and Aquinas. In Section 2, I explore two alternative traditions of natural law, and explain why these constitute rivals to the Aristotelian tradition. In Section 3, I go on to elaborate a via negativa along which natural law norms can be discovered. On this basis, I unpack what I call three 'experiments in being', each of which illustrates the cogency of this method. In Section 4, I investigate and rebut two seminal challenges to natural law methodology, namely, the fact/value distinction in metaethics and Darwinian evolutionary biology. In Section 5, I then outline and criticise the 'new' natural law theory, which is an attempt to revise natural law thought in light of the two challenges above. I conclude, in Section 6, with a summary and some reflections on the prospects for natural law theory.
This Element has three main aims. First, it aims to help the reader understand the concept of computation that Turing developed, his corresponding results, and what those results indicate about the limits of computational possibility. Second, it aims to bring the reader up to speed on analyses of computation in physical systems which provide the most general characterizations of what it takes for a physical system to be a computational system. Third, it aims to introduce the reader to some different kinds of quantum computers, describe quantum speedup, and present some explanation sketches of quantum speedup. If successful, this Element will equip the reader with a basic knowledge necessary for pursuing these topics in more detail.
Lithium isotopes are a relatively novel tracer of present and past silicate weathering processes. Given that silicate weathering is the primary long-term method by which CO2 is removed from the atmosphere, Li isotope research is going through an exciting phase. We show the weathering processes that fractionate dissolved and sedimentary Li isotope ratios, focusing on weathering intensity and clay formation. We then discuss the carbonate and silicate archive potential of past seawater δ7Li. These archives have been used to examine Li isotope changes across both short and long timescales. The former can demonstrate the rates at which the climate is stabilised from perturbations via weathering, a fundamental piece of the puzzle of the long-term carbon cycle.
The main aim of this Element is to introduce the topic of limited awareness, and changes in awareness, to those interested in the philosophy of decision-making and uncertain reasoning. While it has long been of interest to economists and computer scientists, this topic has only recently been subject to philosophical investigation. Indeed, at first sight limited awareness seems to evade any systematic treatment: it is beyond the uncertainty that can be managed. On the one hand, an agent has no control over what contingencies she is and is not aware of at a given time, and any awareness growth takes her by surprise. On the other hand, agents apparently learn to identify the situations in which they are more and less likely to experience limited awareness and subsequent awareness growth. How can these two sides be reconciled? That is the puzzle we confront in this Element.
The Covid-19 pandemic triggered the first global public health emergency since 1918, the greatest economic crisis since the Great Depression, and the greatest geopolitical tensions in decades. Global governance mechanisms failed. Yet, East Asian countries (with caveats) managed to control Covid-19 better than most other countries and to increase their cooperation toward economic integration, despite their position on the security frontline. What explains this East Asian Covid paradox in a region devoid of strong regional institutions? This Element argues that high levels of institutional preparation, social cohesion, and global strategic reinforcement in a context of situational convergence explain the results. It relies on high-level interviews and case studies across the region.
Complex networks datasets often come with the problem of missing information: interactions data that have not been measured or discovered, may be affected by errors, or are simply hidden because of privacy issues. This Element provides an overview of the ideas, methods and techniques to deal with this problem and that together define the field of network reconstruction. Given the extent of the subject, the authors focus on the inference methods rooted in statistical physics and information theory. The discussion is organized according to the different scales of the reconstruction task, that is, whether the goal is to reconstruct the macroscopic structure of the network, to infer its mesoscale properties, or to predict the individual microscopic connections.
Although childhood depressive disorders are relatively rare, the experience of depression in children's lives is not. Developmental contextual perspectives denote the importance of considering both depressive disorder and the experience of subclinical depressive symptoms in the child and the family to fully understand the implications of depressive experience for children's developmental well-being. This Element draws on basic emotion development and developmental psychopathology perspectives to address the nature of depressive experience in childhood, both symptoms and disorder, focusing on seminal and recent research that details critical issues regarding its phenomenology, epidemiology, continuity, etiology, consequences, and interventions to ameliorate the developmental challenges inherent in the experience. These issues are addressed within the context of the child's own experience and from the perspective of parent depression as a critical context that influences children's developmental well-being. Conclusions include suggestions for new directions in research on children's lives that focus on more systemic processes.
Since the mid-2000s, the quality of democracy around the world has been in decline, and Southeast Asia is no exception. This Element analyzes the extent, patterns and drivers of democratic deconsolidation in the three Southeast Asian countries that boast the longest history of electoral democracy in the region: Indonesia, the Philippines and Thailand. While the exact deconsolidation outcomes differ, all three nations have witnessed similar trends of democratic erosion. In each case, long-standing democratic deficiencies (such as clientelism, politicized security forces and non-democratic enclaves) have persisted; rising wealth inequality has triggered political oligarchization and subsequent populist responses embedded in identity politics; and ambitious middle classes have opted for non-democratic alternatives to safeguard their material advancement. As a result, all three polities have descended from their democratic peaks between the late 1980s and early 2000s, with few signs pointing to a return to previous democratization paths.