bluuebunny/crossref_metadata_2025 huggingface dataset:
Metric Spaces
Authors: Copson E. T.
Published: February 2010

Metric space topology, as the generalization to abstract spaces of the theory of sets of points on a line or in a plane, unifies many branches of classical analysis and is necessary introduction to functional analysis. Professor Copson's book, which is based on lectures given to third-year undergraduates at the University of St Andrews, provides a more leisurely treatment of metric spaces than is found in books on functional analysis, which are usually written at graduate student level. His presentation is aimed at the applications of the theory to classical algebra and analysis; in particular, the chapter on contraction mappings shows how it provides proof of many of the existence theorems in classical analysis.
The Monster Group and Majorana Involutions
Authors: Ivanov A. A.
Published: February 2010

This is the first book to contain a rigorous construction and uniqueness proof for the largest and most famous sporadic simple group, the Monster. The author provides a systematic exposition of the theory of the Monster group, which remains largely unpublished despite great interest from both mathematicians and physicists due to its intrinsic connection with various areas in mathematics, including reflection groups, modular forms and conformal field theory. Through construction via the Monster amalgam – one of the most promising in the modern theory of finite groups – the author observes some important properties of the action of the Monster on its minimal module, which are axiomatized under the name of Majorana involutions. Development of the theory of the groups generated by Majorana involutions leads the author to the conjecture that Monster is the largest group generated by the Majorana involutions.
The Origins of Peasant Servitude in Medieval Catalonia
Authors: Freedman Paul
Published: February 2010

This 1991 book describes the history of peasants in Catalonia, the wealthiest and politically dominant part of the medieval Kingdom of Aragon, between the ninth and fifteenth centuries. It focuses on the period from 1000 to 1300, when free peasants who had held property under favourable frontier conditions were progressively subjugated by their lords. Between 1462 and 1486 Catalan peasants mounted the most successful peasants' war of the Middle Ages, and achieved the formal abolition of servitude. Professor Freedman seeks to explain both the process by which servitude was strengthened over the centuries, and its eventual weakening before a direct moral and military challenge. He addresses both the causes of enserfment and the limitations on its effectiveness. The book integrates archival evidence with the theories of society elaborated by medieval jurists. Comparisons are drawn between Catalonia and other regions, and its experience is situated within a spectrum of different social and economic conditions.
Applied Surgical Physiology Vivas
Authors: Kanani Mazyar , Elliott Martin
Published: February 2010

An understanding of basic sciences is the cornerstone of medical and surgical training, and viva examinations in particular remain a source of anxiety for many candidates. Applied Surgery Physiology Vivas follows the same format as the hugely popular General Pathology Vivas and Surgical Critical Care Vivas. It gives candidates a means of practising some of the most common questions that they will be asked in their viva examinations, with detailed model answers and diagrams to highlight key points where necessary. Pocket-sized for portability, and packed with useful information in an easy-to-use A-Z format, this book will help the reader to broaden their knowledge base and, by practising the vivas, gain confidence in their examination technique.
Series Expansion Methods for Strongly Interacting Lattice Models
Authors: Oitmaa Jaan , Hamer Chris , Zheng Weihong
Published: February 2010

Perturbation series expansion methods are sophisticated numerical tools used to provide quantitative calculations in many areas of theoretical physics. This book gives a comprehensive guide to the use of series expansion methods for investigating phase transitions and critical phenomena, and lattice models of quantum magnetism, strongly correlated electron systems and elementary particles. Early chapters cover the classical treatment of critical phenomena through high-temperature expansions, and introduce graph theoretical and combinatorial algorithms. The book then discusses high-order linked-cluster perturbation expansions for quantum lattice models, finite temperature expansions, and lattice gauge models. Also included are numerous detailed examples and case studies, and an accompanying resources website, www.cambridge.org/9780521842426, contains programs for implementing these powerful numerical techniques. A valuable resource for graduate students and postdoctoral researchers working in condensed matter and particle physics, this book will also be useful as a reference for specialized graduate courses on series expansion methods.
Traditional Politics and Regime Change in Brazil
Authors: Hagopian Frances
Published: February 2010

This 1996 book is about politics in Brazil during the military regime of 1964–85 and the transition to democracy. Unlike most books about contemporary Brazilian politics that focus on promising signs of change, this book seeks to explain remarkable political continuity in the Brazilian political system. It attributes the persistence of traditional politics and the dominance of regionally based, traditional political elites in particular to the manner in which the economic and political strategies of the military, together with the transition to democracy, reinforced the clientelistic, personalistic, and regional basis of state-society relations. The book focuses on the political competition and representation in the state of Minas Gerais.
Geometrical Frustration
Authors: Sadoc Jean-François , Mosseri Rémy
Published: February 2010

This book shows how the concept of geometrical frustration can be used to elucidate the structure and properties of non-periodic materials such as metallic glasses, quasicrystals, amorphous semiconductors and complex liquid crystals. Geometric frustration is introduced through examples and idealized models, leading to a consideration of how the concept can be used to identify ordered and defective regions in real materials. Then it is shown how these principles can also be used to model physical properties of materials, in particular specific volume, melting, the structure factor and the glass transition. Final chapters consider geometric frustration in periodic structures with large cells and quasiperiodic order. Appendices give all necessary background on geometry, symmetry and tilings. The text considers geometrical frustration at different scales in many types of materials and structures, including metals, amorphous solids, liquid crystals, amphiphiles, cholisteric systems, polymers, phospholipid membranes, atomic clusters, and quasicrystals. Of interest to researchers in condensed matter physics, materials science and structural chemistry, as well as mathematics and structural biology.
Bach: The Goldberg Variations
Authors: Williams Peter
Published: February 2010

Many listeners and players are fascinated by Bach's Goldberg Variations. In this wideranging and searching study, Professor Williams, one of the leading Bach scholars of our time, helps them probe its depths and understand its uniqueness. He considers the work's historical origins, especially in relation to all Bach's Clavierübung volumes and late keyboard works, its musical agenda and its formal shape, and discusses significant performance issues. In the course of the book he poses a number of key questions. Why should such a work be written? Does the work have both a conceptual and a perceptual shape? What other music is likely to have influenced the Goldberg and to what extent is it trying to be encyclopedic? What is the canonic vocabulary? How have contemporaries or musicians from Beethoven to the present day seen this work and, above all, how has its mysterious beauty been created?
Concrete Vaulted Construction in Imperial Rome
Authors: Lancaster Lynne C.
Published: February 2010

Concrete Vaulted Construction in Imperial Rome examines methods and techniques that enabled builders to construct some of the most imposing monuments of ancient Rome. Focusing on structurally innovative vaulting and the factors that influenced its advancement, Lynne Lancaster also explores a range of related practices, including lightweight pumice as aggregate, amphoras in vaults, vaulting ribs, metal tie bars, and various techniques of buttressing. She provides the geological background of the local building stones and applies mineralogical analysis to determine material provenance, which in turn suggests trading patterns and land use. Lancaster also examines construction techniques in relation to the social, economic, and political contexts of Rome, in an effort to draw connections between changes in the building industry and the events that shaped Roman society from the early empire to late antiquity. This book was awarded the James R. Wiseman Book Award from the Archaeological Institute of America in 2007.
The United States in the Asia-Pacific since 1945
Authors: Buckley Roger
Published: February 2010

In a fast-moving and incisive narrative, Roger Buckley examines America's close and continuous relationship with the Asia-Pacific region from the end of the Pacific War to the first days of the Presidency of George W. Bush. The author traces the responses of the United States government to the major crises in the area through the Cold War decades and the initial post-Cold War years. He demonstrates how the US sought to maintain its dominant regional position through a series of security alliances and its own political, military and economic strengths. Professor Buckley examines the subject from geopolitical perspectives to provide a gateway to the understanding of a complex region certain to be of global importance in the twenty-first century.
Understanding Ethical Failures in Leadership
Authors: Price Terry
Published: February 2010

Why do leaders fail ethically? In this book, Terry L. Price applies a multi-disciplinary approach to an understanding of immorality in the public, private, and non-profit sectors. He argues that leaders can know that a certain kind of behavior is generally required by morality but nonetheless be mistaken as to whether the relevant moral requirement applies to them in a particular situation and whether others are protected by this requirement. Price articulates how leaders make exceptions of themselves, explains how the justificatory force of leadership gives rise to such exception-making, and develops normative prescriptions that leaders should adopt as a response to this feature of their moral psychology.
Religion and Politics in the International System Today
Authors: Hanson Eric O.
Published: February 2010

This book proposes a post-Cold War paradigm based on the interaction between the contemporary globalization of the political, economic, military, and communication systems and the increasing role of religion in influencing global politics. Rapid technological advances constantly recast politics, economics, armed conflict, and the media. These four systems are thus becoming not just more international each in themselves, but they are also rapidly integrating among themselves. As a result, the four world systems constantly create new environments in which individuals and societies must make rapid choices on the basis of their perceived personal and communal identities. This book constructs its global paradigm by explaining the roles of Christianity, Islam, Judaism, Hinduism, Buddhism, Confucianism, and Maoist Marxism in world politics.
Patriots, Politics, and the Oklahoma City Bombing
Authors: Wright Stuart A.
Published: February 2010

This book explores social movements by analyzing an escalating spiral of tension between the Patriot movement and the state centered on the mutual framing of conflict as 'warfare'. By examining the social construction of 'warfare' as a principal script or frame defining the movement-state dynamic, Stuart A. Wright explains how this highly charged confluence of a war narrative engendered a kind of symbiosis leading to the escalation of a mutual threat that culminated in the Oklahoma City bombing. Wright offers a unique perspective on the events leading up to the bombing because he served as a consultant to Timothy McVeigh's defense team for eighteen months and draws on primary data based on face-to-face interviews with McVeigh. The book contends that McVeigh was firmly entrenched in the Patriot movement and was part of a network of 'warrior cells' that planned and implemented the bombing.
The Swedish Imperial Experience 1560–1718
Authors: Roberts Michael
Published: February 2010

In his Wiles Lectures for 1977 Professor Roberts examines some of the problems raised by Sweden's brief career as a great power, and seeks to answer some of the questions that flow from them. Were the underlying considerations which prompted the unexpected development geopolitical, or social, or economic? How was it possible to produce the financial resources and the manpower which the enterprise demanded? How far was seventeenth-century Sweden a militarized society? What importance had official propaganda and national myths? Did the consititutional situation help to make an expansionist foreign policy easier? The structure of the empire is next examined: its administration, the ties that held it together, the differing interests of the provinces, the varying responses of the metropolitan power was there, in fact, anything deserving the name of an imperial policy? How did the provinces view the Swedish connexion? In a final chapter the author tries to answer the question why, if Sweden could acquire an empire without undue strain, she could not retain it; why the collapse was so rapid and so total; and whether her career as a great power had real relevance to the country's subsequent history. On almost all these topics little information is available in English, and no comparable treatment of them on this scale exists in any language.
Theory of Algebraic Integers
Authors: Dedekind Richard , Stillwell John
Published: February 2010

The invention of ideals by Dedekind in the 1870s was well ahead of its time, and proved to be the genesis of what today we would call algebraic number theory. His memoir 'Sur la Theorie des Nombres Entiers Algebriques' first appeared in instalments in the 'Bulletin des sciences mathematiques' in 1877. This is a translation of that work by John Stillwell, who also adds a detailed introduction that gives the historical background as well as outlining the mathematical obstructions that Dedekind was striving to overcome. Dedekind's memoir gives a candid account of his development of an elegant theory as well as providing blow-by-blow comments as he wrestled with the many difficulties encountered en route. A must for all number theorists.
The Theory of Distributions
Authors: Richards J. Ian , Youn Heekyung K.
Published: February 2010

This book is a self-contained introduction to the theory of distributions, sometimes called generalized functions. Most books on this subject are either intuitive or else rigorous but technically demanding. Here, by concentrating on the essential results, the authors have introduced the subject in a way that will most appeal to non-specialists, yet is still mathematically correct. Topics covered include: the Dirac delta function, generalized functions, dipoles, quadrupoles, pseudofunctions and Fourier transforms. The self-contained treatment does not require any knowledge of functional analysis or topological vector spaces; even measure theory is not needed for most of the book. The book, which can be used either to accompany a course or for self-study, is liberally supplied with exercises. It will be a valuable introduction to the theory of distributions and their applications for students or professionals in statistics, physics, engineering and economics.
Topological Geometry
Authors: Porteous Ian R.
Published: February 2010

The earlier chapter of this self-contained text provide a route from first principles through standard linear and quadratic algebra to geometric algebra, with Clifford's geometric algebras taking pride of place. In parallel with this is an account, also from first principles, of the elementary theory of topological spaces and of continuous and differentiable maps that leads up to the definitions of smooth manifolds and their tangent spaces and of Lie groups and Lie algebras. The calculus is presented as far as possible in basis free form to emphasize its geometrical flavour and its linear algebra content. In this second edition Dr Porteous has taken the opportunity to add a chapter on triality which extends earlier work on the Spin groups in the chapter on Clifford algebras. The details include a number of important transitive group actions and a description of one of the exceptional Lie groups, the group G2. A number of corrections and improvements have also been made. There are many exercises throughout the book and senior undergraduates in mathematics as well as first-year graduate students will continue to find it stimulating and rewarding.
Invention and Evolution
Authors: French Michael
Published: February 2010

This textbook for engineering students provides an introduction to design for function, using many examples of manufactured artefacts and living organisms to demonstrate common themes and fundamental principles. Examples forcefully illustrate the importance of the basic design principles related to materials, energy and information. The author also discusses the relation of aesthetic and functional design, the crucial relation of design to production in artefacts, and reproduction in organisms. The book concludes with a brief summary of the role and requirements of designers and inventors. This second edition has been extensively revised, with more examples and a new chapter with actual design case studies to illustrate key ideas. In addition, many exercises have been added to help reinforce important points in the text.
Paradoxes of Belief and Strategic Rationality
Authors: Koons Robert C.
Published: February 2010

This book develops a framework for analysing strategic rationality, a notion central to contemporary game theory, which is the formal study of the interaction of rational agents and which has proved extremely fruitful in economics, political theory and business management. The author argues that a logical paradox lies at the root of a number of persistent puzzles in game theory, in particular those concerning rational agents who seek to establish some kind of reputation. Building on the work of Parsons, Burge, Gaifman and Barwise and Etchemendy, Robert Koons constructs a context-sensitive solution to the whole family of liar-like paradoxes including, for the first time, a detailed account of how the interpretation of paradoxical statements is fixed by context. This analysis provides an understanding of how the rational agent model can account for the emergence of rules, practices and institutions.
Mean Streets
Authors: Hagan John , McCarthy Bill
Published: February 2010

Mean Streets is a field study of young people who have left home and school and are living on the streets of Toronto and Vancouver. This book includes the personal narratives and explanatory accounts, in their own words, of some of the more than four hundred young people who participated in the summer-long study, which featured intensive personal interviews. The study examines why youth take to the streets, their struggles to survive on the street, their victimization and involvement in crime, their associations with other street youth, especially within 'street families', their contacts with the police, and their efforts to leave the street and rejoin conventional society. Major theories of youth crime are analyzed and reappraised in the context of a new social capital theory of crime.
Theory of Production
Authors: Kurz Heinz D. , Salvadori Neri
Published: February 2010

This compelling book contains a comprehensive analytical treatment of the theory of production in a long-period framework. Although the authors take a 'Classical' approach to their subject, the scope of investigation and methods employed should interest all economic theorists. Professors Kurz and Salvadori explore economic systems that are characterised by a particular kind of primary input in the production process, such as different kinds of labour and natural resources. These systems and the corresponding prices can be understood to reflect characteristic features of a capitalist market economy in an ideal way: they express the pure logic of the relationship between value and distribution in an economic system. Specific chapters deal with prices and income distribution, economic growth, joint production, fixed capital, scarce natural resources (both renewable and exhaustible), and heterogeneous labour. The historical origins of the concepts used are also discussed in considerable detail.
Predation by beetles (Carabidae, Staphylinidae) on eggs and juveniles of the Iberian slugArion lusitanicusin the laboratory
Authors: Hatteland B.A. , Grutle K. , Mong C.E. , Skartveit J. , Symondson W.O.C. , Solhøy T.
Published: February 2010

Arion lusitanicushas become a major pest species in western Norway in the last few years. This species originates from southern Europe but has been spread by humans over large parts of central and northern Europe during recent decades. Slugs have traditionally been controlled by the use of molluscicides; but, as these may have serious ecological side effects, biological control of slugs is highly desirable. Potential biological control agents include nematodes, gastropods and arthropods. In laboratory experiments, we tested whether five common predator beetles would feed on eggs and juveniles ofA. lusitanicus. The speciesCarabus nemoralis,Nebria brevicollis,Pterostichus melanariusandPterostichus niger(Carabidae) as well asStaphylinus erythropterus(Staphylinidae) were tested, of which onlyP. melanariushas been tested onA. lusitanicuspreviously.Nebria brevicollisdid not feed on slug eggs or newly hatched slugs, but the remaining four species all killed and ate a large proportion of the eggs and hatchlings offered. BothP. melanariusandP. nigeralso destroyedA. lusitanicuseggs and hatchlings under conditions emulating those in the field. Prey size choice experiments were conducted by feedingC. nemoralis,P. nigerandS. erythropteruson different sizes ofA. lusitanicus.Carabus nemoraliswas also given a choice between two slug species,A. lusitanicusandDeroceras reticulatum. A significant preference for slugs smaller than one gram was evident forC. nemoralis, while the other beetles struggled much more to overcome the mucus of juvenile slugs. No significant preference was found betweenA. lusitanicusandD. reticulatumas prey forC. nemoralis. We also discuss the feasibility of biological control ofA. lusitanicususing beetle predators.
Key factors affecting the spring emergence of pea moth (Cydia nigricana)
Authors: Thöming G. , Saucke H.
Published: February 2010

The hypothesis that spring emergence of the pea moth Cydia nigricana is regulated by environmental factors, particularly photoperiod and temperature, was examined in this study. A long-term field study was conducted in two distinct pea-growing areas in Hesse and Saxony, Germany. Strong correlations between the flight phenology of pea moth in spring and air temperature, soil temperature, solar radiation and day length were demonstrated for three consecutive years. In laboratory experiments, we elucidated the interaction of different photoperiod-temperature regimes, verifying cumulative day-degree data in relation to pea moth emergence rates in the field. C. nigricana temperature sensitivity is apparently initiated by long day conditions with a critical day length of about 14 h L:D. The overall results contribute to the theory that photoperiod and temperature interact as regulatory cues for spring emergence of C. nigricana. The findings are discussed in terms of the development of predictive models and decision support systems for pea moth control.
What love has to do with it: An attachment perspective on pair bonding and sexual behavior
Authors: Zayas Vivian , Ram Daphna
Published: February 2010

Del Giudice proposes that short-term mating strategies are adaptive for attachment-avoidant men. We argue that this model (1) does not apply to the majority of avoidant men (fearful-avoidants); (2) is based on limited evidence that the remaining subset of avoidant men (dismissing-avoidants) engage in short-term mating strategies; and (3) disregards the importance of pair bonding even for dismissing-avoidants.
ASYMPTOTICALLY UNBIASED ESTIMATION OF AUTOCOVARIANCES AND AUTOCORRELATIONS WITH LONG PANEL DATA
Authors: Okui Ryo
Published: February 2010

An important reason for analyzing panel data is to observe the dynamic nature of an economic variable separately from its time-invariant unobserved heterogeneity. This paper examines how to estimate the autocovariances of a variable separately from its time-invariant unobserved heterogeneity. When both cross-sectional and time series sample sizes tend to infinity, we show that the within-group autocovariances are consistent, although they are severely biased when the time series length is short. The biases have the leading term that converges to the long-run variance of the individual dynamics. This paper develops methods to estimate the long-run variance in panel data settings and to alleviate the biases of the within-group autocovariances based on the proposed long-run variance estimators. Monte Carlo simulations reveal that the procedures developed in this paper effectively reduce the biases of the estimators for small samples.
TESTS OF THE MARTINGALE DIFFERENCE HYPOTHESIS USING BOOSTING AND RBF NEURAL NETWORK APPROXIMATIONS
Authors: Kapetanios George , Blake Andrew P.
Published: February 2010

The martingale difference restriction is an outcome of many theoretical analyses in economics and finance. A large body of econometric literature deals with tests of that restriction. We provide new tests based on radial basis function (RBF) neural networks. Our work is based on the test design of Blake and Kapetanios (2000, 2003a, 2003b). However, unlike that work we provide a formal theoretical justification for the validity of these tests and present some new general theoretical results. These results take advantage of the link between the algorithms of Blake and Kapetanios (2000, 2003a, 2003b) and boosting. We carry out a Monte Carlo study of the properties of the new tests and find that they have very good power performance. A simplified implementation of boosting is found to have desirable properties and small computational cost. An empirical application to the S&P 500 constituents illustrates the usefulness of our new test.
Investigation of risk factors for Salmonella on fattening-turkey farms
Authors: FEATHERSTONE C. A. , REICHEL R. , SNOW L. C. , DAVIES R. H. , CHRISTIANSEN K. H. , CARRIQUE-MAS J. J. , EVANS S. J.
Published: February 2010

A cross-sectional study into risk factors for Salmonella was undertaken using data gathered from 252 fattening turkey flocks in the UK. The data was derived from the EU baseline survey conducted during 2006 and 2007, in addition to a voluntary questionnaire. Multivariate logistic regression models identified significant risk factors for Salmonella spp. and Salmonella Typhimurium. A decreased risk of Salmonella spp. infection was associated with a history of intestinal illness in the sampled flock (OR 0·17), the use of wood shavings as litter (OR 0·21), use of disinfectant in the cleaning process (OR 0·25), incineration of dead birds on farm (OR 0·29), seasonal production (OR 0·31), farm staff also working with cattle (OR 0·31), and the presence of pigs on neighbouring farms (OR 0·38). The risk of isolating Salmonella spp. varied according to the company from which the poults were sourced. A reduced risk of S. Typhimurium infection was associated with the use of wax blocks to control rodents (OR 0·09), using mains water (OR 0·19) and having a Salmonella test programme (OR 0·23). An increased risk of S. Typhimurium infection was associated with storage of items around the turkey house (OR 5·20), evidence of mice (OR 4·71) and a soil surface surrounding the turkey house (OR 2·70). This study therefore identifies a number of important practical measures which can be implemented by farmers and veterinarians within the turkey industry to assist in the control of salmonellosis at the farm level.
The Hitman Study
Authors: Ferguson Christopher J. , Rueda Stephanie M.
Published: February 2010

This article explores commonly discussed theories of violent video game effects: the social learning, mood management, and catharsis hypotheses. An experimental study was carried out to examine violent video game effects. In this study, 103 young adults were given a frustration task and then randomized to play no game, a nonviolent game, a violent game with good versus evil theme (i.e., playing as a good character taking on evil), or a violent game in which they played as a “bad guy.” Results indicated that randomized video game play had no effect on aggressive behavior; real-life violent video game-playing history, however, was predictive of decreased hostile feelings and decreased depression following the frustration task. Results do not support a link between violent video games and aggressive behavior, but do suggest that violent games reduce depression and hostile feelings in players through mood management.
Emotional Experiences of Students in the Classroom
Authors: Ahmed Wondimu , van der Werf Greetje , Minnaert Alexander
Published: February 2010

In this article, we report on a multimethod qualitative study designed to explore the emotional experiences of students in the classroom setting. The purpose of the study was threefold: (1) to explore the correspondence among nonverbal expressions, subjective feelings, and physiological reactivity (heart rate changes) of students’ emotions in the classroom; (2) to examine the relationship between students’ emotions and their competence and value appraisals; and (3) to determine whether task difficulty matters in emotional experiences. We used multiple methods (nonverbal coding scheme, video stimulated recall interview, and heart rate monitoring) to acquire data on emotional experiences of six grade 7 students. Concurrent correspondence analyses of the emotional indices revealed that coherence between emotional response systems, although apparent, is not conclusive. The relationship between appraisals and emotions was evident, but the effect of task difficulty appears to be minimal.
Magma‐sponge hypothesis and stratovolcanoes: Case for a compressible reservoir and quasi‐steady deep influx at Soufrière Hills Volcano, Montserrat
Authors: Voight Barry , Widiwijayanti Christina , Mattioli Glen , Elsworth Derek , Hidayat Dannie , Strutt M.
Published: February 2010

We use well‐documented time histories of episodic GPS surface deformation and efflux of compressible magma to resolve apparent magma budget anomalies at Soufrière Hills volcano (SHV) on Montserrat, WI. We focus on data from 2003 to 2007, for an inflation succeeded by an episode of eruption‐plus‐deflation. We examine Mogi‐type and vertical prolate ellipsoidal chamber geometries to accommodate both mineralogical constraints indicating a relatively shallow pre‐eruption storage, and geodetic constraints inferring a deeper mean‐pressure source. An exsolved phase involving several gas species greatly increases andesite magma compressibility to depths >10 km (i.e., for water content >4 wt%, crystallinity ∼40%), and this property supports the concept that much of the magma transferred into or out of the crustal reservoir could be accommodated by compression or decompression of stored reservoir magma (i.e., the “magma‐sponge”). Our results suggest quasi‐steady deep, mainly mafic magma influx of the order of 2 m3s−1, and we conclude that magma released in eruptive episodes is approximately balanced by cumulative deep influx during the eruptive episode and the preceding inflation. Our magma‐sponge model predicts that between 2003 and 2007 there was no evident depletion of magma reservoir volume at SHV, which comprises tens of km3 with radial dimensions of order ∼1–2 km, in turn implying a long‐lived eruption.
Spatial‐temporal variability of soil moisture and its estimation across scales
Authors: Brocca L. , Melone F. , Moramarco T. , Morbidelli R.
Published: February 2010

The soil moisture is a quantity of paramount importance in the study of hydrologic phenomena and soil‐atmosphere interaction. Because of its high spatial and temporal variability, the soil moisture monitoring scheme was investigated here both for soil moisture retrieval by remote sensing and in view of the use of soil moisture data in rainfall‐runoff modeling. To this end, by using a portable Time Domain Reflectometer, a sequence of 35 measurement days were carried out within a single year in seven fields located inside the Vallaccia catchment, central Italy, with area of 60 km2. Every sampling day, soil moisture measurements were collected at each field over a regular grid with an extension of 2000 m2. The optimization of the monitoring scheme, with the aim of an accurate mean soil moisture estimation at the field and catchment scale, was addressed by the statistical and the temporal stability. At the field scale, the number of required samples (NRS) to estimate the field‐mean soil moisture within an accuracy of 2%, necessary for the validation of remotely sensed soil moisture, ranged between 4 and 15 for almost dry conditions (the worst case); at the catchment scale, this number increased to nearly 40 and it refers to almost wet conditions. On the other hand, to estimate the mean soil moisture temporal pattern, useful for rainfall‐runoff modeling, the NRS was found to be lower. In fact, at the catchment scale only 10 measurements collected in the most “representative” field, previously determined through the temporal stability analysis, can reproduce the catchment‐mean soil moisture with a determination coefficient, R2, higher than 0.96 and a root‐mean‐square error, RMSE, equal to 2.38%. For the “nonrepresentative” fields the accuracy in terms of RMSE decreased, but similar R2 coefficients were found. This insight can be exploited for the sampling in a generic field when it is sufficient to know an index of soil moisture temporal pattern to be incorporated in conceptual rainfall‐runoff models. The obtained results can address the soil moisture monitoring network design from which a reliable soil moisture temporal pattern at the catchment scale can be derived.
Numerical simulation for the accelerator of the KSTAR neutral beam ion source
Authors: Kim Tae-Seong , Jeong Seung Ho , In Sang Ryul
Published: February 2010

Recent experiments with a prototype long-pulse, high-current ion source being developed for the neutral beam injection system of the Korea Superconducting Tokamak Advanced Research have shown that the accelerator grid assembly needs a further upgrade to achieve the final goal of 120keV/65A for the deuterium ion beam. The accelerator upgrade concept was determined theoretically by simulations using the IGUN code. The simulation study was focused on finding parameter sets that raise the optimum perveance as large as possible and reduce the beam divergence as low as possible. From the simulation results, it was concluded that it is possible to achieve this goal by sliming the plasma grid (G1), shortening the second gap (G2-G3), and adjusting the G2 voltage ratio.
Radio frequency ion source operated with field effect transistor based radio frequency system
Authors: Ando A. , Komuro A. , Matsuno T. , Tsumori K. , Takeiri Y.
Published: February 2010

Characteristics of radio frequency (RF) plasma production are investigated using a field effect transistor inverter power supply as an RF wave source. With the frequency of around 0.3 MHz, an electron density over 1018 m−3 is produced in argon plasma. Although lower densities are obtained in hydrogen plasma, it drastically increased up to 5×1018 m−3 with an axial magnetic field of around 100 G applied in the driver region. Effects of the magnetic field and gas pressure are investigated in the RF produced plasma with the frequency of several hundred kilohertz.
Phononic gaps in thin semiconductor superlattices
Authors: Hepplestone S. P. , Srivastava G. P.
Published: February 2010

We have studied one-dimensional phononic gaps in thin semiconductor superlattices. A general methodology has been developed for predicting the locations of these gaps in both thin and thick superlattices. Quantitative analysis of results for the phonon dispersions of Si/Ge[001] and GaAs/AlAs[001] superlattices are presented as both a function of period and composition. The effect of interface mixing is studied and its effects are found to be smaller than previously guessed. The introduction of the defects is shown to not change the phononic gap characteristics significantly. Finally, we present a discussion on the merits and uses of one-dimensional phononic structures.
Bond order effects in electromechanical actuation of armchair single-walled carbon nanotubes
Authors: Mirfakhrai Tissaphern , Krishna-Prasad Rahul , Nojeh Alireza , Madden John D. W.
Published: February 2010

In this paper we first use ab initio simulations to study the strains induced by charging an armchair (5,5) carbon nanotube (CNT) segment. The observed behavior is far from a monotonic expansion that one might have expected from a classical point of view. Subsequently a new method is proposed to predict the nonelectrostatic part of the electromechanical actuation response of the nanotube based on the spatial distribution of its molecular orbitals. Locally bonding and locally antibonding molecular orbitals are defined for the CNT segment structure based on analogy with bonding and antibonding orbitals in diatomic molecules. The nonmonotonic overall actuation is explained based on the above proposition and the general alignment of the expanding and contracting bonds with respect to the axis or circumference of the CNT segment. Using the well-known concept of bond order, the actuation of this complex system of many atoms is predicted with close quantitative agreement with the ab initio simulations.
Approximate solutions of the Dirac equation for the Rosen–Morse potential including the spin-orbit centrifugal term
Authors: Ikhdair Sameer M.
Published: February 2010

We give the approximate analytic solutions of the Dirac equation for the Rosen–Morse potential including the spin-orbit centrifugal term. In the framework of the spin and pseudospin symmetry concept, we obtain the analytic bound state energy spectra and the corresponding two-component upper and lower spinors of the two Dirac particles, in closed form, by means of the Nikiforov–Uvarov method. The special cases of the s-wave κ=±1 (l=l̃=0) Rosen–Morse potential, the Eckart-type potential, the PT-symmetric Rosen–Morse potential, and the nonrelativistic limits are briefly studied.
Soliton gating and switching in liquid crystal light valve
Authors: Piccardi Armando , Alberucci Alessandro , Bortolozzo Umberto , Residori Stefania , Assanto Gaetano
Published: February 2010

Using a photoconductive light valve with nematic liquid crystals, we introduce a versatile platform for the excitation and routing of spatial optical solitons, with external beams controlling the whereabouts of the underlying all-optically induced waveguides and their spatial dynamics. Using this all-optical control of soliton trajectory, we demonstrate a NOR gate, an XNOR, and a Boolean half-adder.
Excess entropy and structural transitions in a two-dimensional square-shoulder fluid
Authors: Singh Murari , Liu Hongjun , Kumar Sanat K. , Ganguly Abir , Chakravarty Charusita
Published: February 2010

Metropolis Monte Carlo simulations on the square-shoulder fluid of Malescio and Pellicane are used to trace the temperature dependent excess entropy, the heat capacity, and configurational energy along several isochores, including those for which mechanically stable zero-temperature structures have been predicted. Thermodynamic signatures of structural phase transitions are identified along several isochores, in addition to the low-density triangular solid and stripe phase transitions identified earlier. The finite temperature phases illustrate the competition between cluster formation and stripe formation as competing mechanisms for generating minimum free energy configurations as a function of density, consistent with earlier results at zero temperature. We also critically examine the usefulness of a phase-ordering rule based on the residual multiparticle entropy (RMPE) in predicting the formation of this diverse set of ordered structures from a disordered fluid phase. For the majority of the isochores studied, the RMPE prediction and the thermodynamic evidence for a phase transition were consistent. However, this criterion fails along isochores that are in regions of coexistence. Thus, the zero-RMPE rule is only likely to be approximately predictive in systems with small phase coexistence regimes, e.g., in the case of liquid crystal forming systems.
Self-assembly of enantiopure domains: The case of indigo on Cu(111)
Authors: Villagomez C. J. , Guillermet O. , Goudeau S. , Ample F. , Xu Hai , Coudret C. , Bouju X. , Zambelli T. , Gauthier S.
Published: February 2010

The adsorption of indigo molecules on Cu(111) was investigated by low temperature (5 K) scanning tunneling microscopy from the isolated single molecule regime to one monolayer. Structural optimization and image calculations demonstrate that the molecules are in a physisorbed state. Because of the reduced symmetry at the surface, single molecules acquire a chiral character upon adsorption leading to a two-dimensional (2D) chirality. They adopt two adsorption configurations, related by a mirror symmetry of the substrate, each with a distinct molecular orientation. Consequently, the 2D chirality is expressed by the orientation of the molecule. For higher coverage, molecules self-assemble by hydrogen bonding in nearly homochiral molecular chains, whose orientation is determined by the orientation taken by the isolated molecules. When the coverage approaches one monolayer, these chains pack into domains. Finally, the completion of the monolayer induces the expulsion of the molecules of the wrong chirality that are still in these domains, leading to perfect resolution in enantiopure domains.
TGF-β regulates T-cell neurokinin-1 receptor internalization and function
Authors: Beinborn Martin , Blum Arthur , Hang Long , Setiawan Tommy , Schroeder Jonathan C. , Stoyanoff Korynn , Leung John , Weinstock Joel V.
Published: February 2010

Substance P (SP) is a proinflammatory mediator implicated in inflammatory bowel disease (IBD) and other inflammatory states. SP acts by stimulating the neurokinin-1 receptor (NK-1R) on T lymphocytes and other cell types, and regulates these cells in a complex interplay with multiple cytokines. The mechanisms of interaction among these inflammatory mediators are not yet fully understood. Here, we demonstrate that function of the NK-1R, a member of the G protein-coupled receptor (GPCR) superfamily, is modulated by TGF-β. The latter acts not on a GPCR but via serine-threonine kinase-class receptors. By flow confocal image analysis, we demonstrate that TGF-β delays SP-induced NK-1R internalization on mucosal T cells isolated from a mouse model of IBD and on granuloma T cells in murine schistosomiasis. Furthermore, luciferase reporter-gene assays revealed that NK-1R stimulation activates the nuclear factor of activated T cell- and activator protein-1-dependent signaling pathways, which are known triggers of effector T-cell cytokine production. TGF-β markedly increases SP-induced activation of these signaling cascades, suggesting that delayed NK-1R internalization results in enhanced signaling. Providing a link to amplified immune function, SP and TGF-β, when applied in combination, trigger a strong release of the proinflammatory cytokines IFN-γ and IL17 from intestinal inflammatory T cells, whereas either agonist alone shows no effect. These observations establish precedent that members of two distinct receptor superfamilies can interact via a previously unrecognized mechanism, and reveal a paradigm of GPCR transregulation that is relevant to IBD and possibly other disease processes.
Diacylglycerol kinase α mediates HGF-induced Rac activation and membrane ruffling by regulating atypical PKC and RhoGDI
Authors: Chianale Federica , Rainero Elena , Cianflone Cristina , Bettio Valentina , Pighini Andrea , Porporato Paolo E. , Filigheddu Nicoletta , Serini Guido , Sinigaglia Fabiola , Baldanzi Gianluca , Graziani Andrea
Published: February 2010

Diacylglycerol kinases (DGKs) convert diacylglycerol (DAG) into phosphatidic acid (PA), acting as molecular switches between DAG- and PA-mediated signaling. We previously showed that Src-dependent activation and plasma membrane recruitment of DGKα are required for growth-factor-induced cell migration and ruffling, through the control of Rac small-GTPase activation and plasma membrane localization. Herein we unveil a signaling pathway through which DGKα coordinates the localization of Rac. We show that upon hepatocyte growth-factor stimulation, DGKα, by producing PA, provides a key signal to recruit atypical PKCζ/ι (aPKCζ/ι) in complex with RhoGDI and Rac at ruffling sites of colony-growing epithelial cells. Then, DGKα-dependent activation of aPKCζ/ι mediates the release of Rac from the inhibitory complex with RhoGDI, allowing its activation and leading to formation of membrane ruffles, which constitute essential requirements for cell migration. These findings highlight DGKα as the central element of a lipid signaling pathway linking tyrosine kinase growth-factor receptors to regulation of aPKCs and RhoGDI, and providing a positional signal regulating Rac association to the plasma membrane.
Surface-coupled proton exchange of a membrane-bound proton acceptor
Authors: Sandén Tor , Salomonsson Lina , Brzezinski Peter , Widengren Jerker
Published: February 2010

Proton-transfer reactions across and at the surface of biological membranes are central for maintaining the transmembrane proton electrochemical gradients involved in cellular energy conversion. In this study, fluorescence correlation spectroscopy was used to measure the local protonation and deprotonation rates of single pH-sensitive fluorophores conjugated to liposome membranes, and the dependence of these rates on lipid composition and ion concentration. Measurements of proton exchange rates over a wide proton concentration range, using two different pH-sensitive fluorophores with different p
K

a

s, revealed two distinct proton exchange regimes. At high pH (> 8), proton association increases rapidly with increasing proton concentrations, presumably because the whole membrane acts as a proton-collecting antenna for the fluorophore. In contrast, at low pH (< 7), the increase in the proton association rate is slower and comparable to that of direct protonation of the fluorophore from the bulk solution. In the latter case, the proton exchange rates of the two fluorophores are indistinguishable, indicating that their protonation rates are determined by the local membrane environment. Measurements on membranes of different surface charge and at different ion concentrations made it possible to determine surface potentials, as well as the distance between the surface and the fluorophore. The results from this study define the conditions under which biological membranes can act as proton-collecting antennae and provide fundamental information on the relation between the membrane surface charge density and the local proton exchange kinetics.