bluuebunny/crossref_metadata_2025_split huggingface dataset:
VAR-BASED OPTIMAL PARTIAL HEDGING
Authors: Cong Jianfa , Tan Ken Seng , Weng Chengguo 
Published: July 2013

AbstractHedging is one of the most important topics in finance. When a financial market is complete, every contingent claim can be hedged perfectly to eliminate any potential future obligations. When the financial market is incomplete, the investor may eliminate his risk exposure by superhedging. In practice, both hedging strategies are not satisfactory due to their high implementation costs, which erode the chance of making any profit. A more practical and desirable strategy is to resort to the partial hedging, which hedges the future obligation only partially. The quantile hedging of Föllmer and Leukert (Finance and Stochastics, vol. 3, 1999, pp. 251–273), which maximizes the probability of a successful hedge for a given budget constraint, is an example of the partial hedging. Inspired by the principle underlying the partial hedging, this paper proposes a general partial hedging model by minimizing any desirable risk measure of the total risk exposure of an investor. By confining to the value-at-risk (VaR) measure, analytic optimal partial hedging strategies are derived. The optimal partial hedging strategy is either a knock-out call strategy or a bull call spread strategy, depending on the admissible classes of hedging strategies. Our proposed VaR-based partial hedging model has the advantage of its simplicity and robustness. The optimal hedging strategy is easy to determine. Furthermore, the structure of the optimal hedging strategy is independent of the assumed market model. This is in contrast to the quantile hedging, which is sensitive to the assumed model as well as the parameter values. Extensive numerical examples are provided to compare and contrast our proposed partial hedging to the quantile hedging.
Forage degradability, rumen bacterial adherence and fibrolytic enzyme activityin vitro: effect of pH or glucose concentration
Authors: FARENZENA R. , KOZLOSKI G. V. , MEZZOMO M. P. , FLUCK A. C. 
Published: July 2013

SUMMARYA set of independent assays were conducted to assess the effects of either pH or glucose concentration on forage degradation, bacterial adherence and on fibrolytic enzyme activityin vitro. For measuring degradation and bacterial adherence, ryegrass (Lolium multiflorum) and bermudagrass (Cynodon dactylon) samples were incubatedin vitrofor 24 h in the medium at different pH (5·5, 6·0, 6·5 or 7·0) or with different initial glucose concentrations (0, 1000, 2000 and 3000 mg/l). For fibrolytic enzyme activity evaluation, forage samples were incubatedin situand the extracted enzymes were incubatedin vitrounder the different pH and glucose treatment conditions. The amount of bacteria adhering to samples and the degradability of dry matter (DM) and neutral detergent fibre (NDF) were higher for ryegrass than for bermudagrass, were not affected by glucose concentration and were linearly and positively affected by increased pH. On average, carboxymethylcellulase (CMCase) and xylanase activities were higher for ryegrass than for bermudagrass in the pH assay, whereas the differences between forages were not significant in the glucose assay. For both forage species, the quadratic effect of pH or glucose concentration on CMCase and xylanase activities was significant. Maximum activity of both enzymes was observed at pH 6·0 or at glucose concentration of 2000 mg/l. In conclusion, forage degradation was affected negatively by decreased ruminal pH due to reduced bacterial adherence. In turn, the pH or glucose effect on fibrolytic enzyme activity was not related to their effects on bacterial adherence or forage degradation, indicating that forage degradation is more dependent on the degree of microbial colonization than on the specific activity of bacterial enzymes.
Prenatal and childhood antecedents of suicide: 50-year follow-up of the 1958 British Birth Cohort Study
Authors: Geoffroy M.-C. , Gunnell D. , Power C. 
Published: July 2013

BackgroundWe aimed to elucidate early antecedents of suicide including possible mediation by early child development.MethodUsing the 1958 birth cohort, based on British births in March 1958, individuals were followed up to adulthood. We used data collected at birth and at age 7 years from various informants. Suicides occurring up to 31 May 2009 were identified from linked national death certificates. Multivariable Cox proportional hazard models were used to investigate risk factors.ResultsAltogether 12399 participants (n = 44 suicides) had complete data. The strongest prenatal risk factors for suicide were: birth order, with risk increasing in later-born children [ptrend = 0.063, adjusted hazard ratio (HR)], e.g. for fourth- or later-born children [HR = 2.27, 95% confidence interval (CI) 0.90–5.75]; young maternal age (HR = 1.18, 95% CI 0.34–4.13 for ⩽19 years and HR = 0.41, 95% CI 0.19–0.91 for >29 years, ptrend = 0.034); and low (<2.5 kg) birth weight (HR = 2.48, 95% CI 1.03–5.95). The strongest risk factors at 7 years were externalizing problems in males (HR = 2.96, 95% CI 1.03–8.47, ptrend = 0.050) and number of emotional adversities (i.e. parental death, neglected appearance, domestic tension, institutional care, contact with social services, parental divorce/separation and bullying) for which there was a graded association with risk of suicide (ptrend = 0.033); the highest (HR = 3.12, 95% CI 1.01–9.62) was for persons with three or more adversities.ConclusionsRisk factors recorded at birth and at 7 years may influence an individual's long-term risk of suicide, suggesting that trajectories leading to suicide have roots in early life. Some factors are amenable to intervention, but for others a better understanding of causal mechanisms may provide new insights for intervention to reduce suicide risk.
Structure of viruses: a short history
Authors: Rossmann Michael G. 
Published: July 2013

AbstractThis review is a partially personal account of the discovery of virus structure and its implication for virus function. Although I have endeavored to cover all aspects of structural virology and to acknowledge relevant individuals, I know that I have favored taking examples from my own experience in telling this story. I am anxious to apologize to all those who I might have unintentionally offended by omitting their work.The first knowledge of virus structure was a result of Stanley's studies of tobacco mosaic virus (TMV) and the subsequent X-ray fiber diffraction analysis by Bernal and Fankuchen in the 1930s. At about the same time it became apparent that crystals of small RNA plant and animal viruses could diffract X-rays, demonstrating that viruses must have distinct and unique structures. More advances were made in the 1950s with the realization by Watson and Crick that viruses might have icosahedral symmetry. With the improvement of experimental and computational techniques in the 1970s, it became possible to determine the three-dimensional, near-atomic resolution structures of some small icosahedral plant and animal RNA viruses. It was a great surprise that the protecting capsids of the first virus structures to be determined had the same architecture. The capsid proteins of these viruses all had a ‘jelly-roll’ fold and, furthermore, the organization of the capsid protein in the virus were similar, suggesting a common ancestral virus from which many of today's viruses have evolved. By this time a more detailed structure of TMV had also been established, but both the architecture and capsid protein fold were quite different to that of the icosahedral viruses. The small icosahedral RNA virus structures were also informative of how and where cellular receptors, anti-viral compounds, and neutralizing antibodies bound to these viruses. However, larger lipid membrane enveloped viruses did not form sufficiently ordered crystals to obtain good X-ray diffraction. Starting in the 1990s, these enveloped viruses were studied by combining cryo-electron microscopy of the whole virus with X-ray crystallography of their protein components. These structures gave information on virus assembly, virus neutralization by antibodies, and virus fusion with and entry into the host cell. The same techniques were also employed in the study of complex bacteriophages that were too large to crystallize. Nevertheless, there still remained many pleomorphic, highly pathogenic viruses that lacked the icosahedral symmetry and homogeneity that had made the earlier structural investigations possible. Currently some of these viruses are starting to be studied by combining X-ray crystallography with cryo-electron tomography.
Capitolia
Authors: Quinn Josephine Crawley , Wilson Andrew 
Published: July 2013

AbstractCapitolia, temples to the triad of divinities Iuppiter Optimus Maximus, Iuno Regina and Minerva Augusta, are often considered part of the standard urban ‘kit’ of Roman colonies. Their placement at one end of the forum is sometimes seen as schematizing and replicating in miniature the relationship between the Capitolium at Rome and the Forum Romanum below it. Reliably attested Capitolia are, however, rarer in the provinces than this widespread view assumes and there seems to be no relationship between civic status and the erection of a Capitolium. Indeed, outside Italy there are very few Capitolia other than in the African provinces, where nearly all known examples belong to the second or early third century a.d., mostly in the Antonine period. This regional and chronological clustering demands explanation, and since it comes too late to be associated with the foundation of colonies, and there is no pattern of correlation with upgrades in civic status, we propose that the explanation has to do with the growing power and influence of North African élites, who introduced the phenomenon from Rome. Rather than being a form of temple imposed from the centre on the provinces, Capitolia were adopted by provincial élites on the basis of their relationship with Rome.
Implementation without control: the role of the private water companies in establishing constant water in nineteenth-century London
Authors: HILLIER JOSEPH 
Published: July 2013

ABSTRACTThe switch from intermittent to constant water supply in London in the late nineteenth century has attracted little attention. This article argues that this transition, the basis of the modern water system, was a considerable undertaking. System-builders (London's private water companies) faced a permissive regulatory environment and a population that could be ambivalent about constant water. While the water companies tried to encourage standardization through contract agreements and inspection, their lack of domestic access encouraged technical fragmentation. Local socio-political relations influenced the form of the constant water system, with consequences for future consumption practices.
Making Cairo modern? Innovation, urban form and the development of suburbia, c. 1880–1922
Authors: MOORE JAMES 
Published: July 2013

ABSTRACT:Cairo has often been seen as a ‘dual city’ divided between a ‘modern’ European city and a historic ‘traditional’ core. This article challenges this view through a historical exploration of suburban Cairo, a subject neglected by mainstream urban historians. A comparative examination of Ismailiyah, Garden City, Zamalek, Maadi, Helwan and Heliopolis illustrates that these suburbs took very different forms and reflected a wide range of historical and contemporary architectural tastes and design perspectives. Not all suburban developments were products of modern technical innovations and by 1922 no suburb had a majority of European residents. The use of the term ‘modern’ to characterize Cairo's suburbs therefore has the tendency to privilege western concepts of the modern and obscure the complexities of suburban social and economic development.
‘Bustling, crowding, and pushing’: pickpockets and the nineteenth-century street crowd
Authors: ANDERSSON PETER K. 
Published: July 2013

ABSTRACTThe history of walking in the city has long been neglected, and the existing scholarship is largely concerned with rioting,flânerieor urban geography. This article aims to detect the behavioural patterns of pedestrian traffic in the late nineteenth century through a close study of the methods of pickpockets in London streets, with information gleaned from trial reports and writings on pickpockets. By analysing the most common ways in which pickpockets operated, as described in numerous accounts, we can see how they adapted to nineteenth-century pedestrian norms, and through this method acquire a rough outline of what pedestrian traffic looked like, and thus how urban dwellers living in a critical historical period adapted and reacted to urban conditions on an everyday level. The evidence shows that pedestrian traffic through the century remained highly interactive, and that the modern aspects of cities identified in theories of civilizing or impoverishment of the public realm had a very limited impact at this time.
The politics of the urban commons in Northern Atlantic Spain in the later Middle Ages
Authors: SOLÓRZANO TELECHEA JESÚS A. 
Published: July 2013

ABSTRACTThis article examines some key issues relating to the emergence of political consciousness and political activity amongst the commons in the towns of Northern Atlantic Spain in the late medieval period. In the fifteenth century, a partnership between the urban business elite and the craft guilds successfully petitioned the monarchy on behalf of the commons, which resulted in municipal reforms. The resolution of issues achieved in the north was radically different from the situation in other cities in the kingdom of Castile, where the commons’ petitions and conflicts with urban oligarchies led to what became known as the ‘Revolt of the Comuneros’ in 1520, which marked the decline of the commons’ assemblies and the end of medieval urban rebellions in the interior of the kingdom.
Hypervalent surface interactions for colloidal stability and doping of silicon nanocrystals
Authors: Wheeler Lance M. , Neale Nathan R. , Chen Ting , Kortshagen Uwe R. 
Published: July 2013

AbstractColloidal semiconductor nanocrystals have attracted attention for cost-effective, solution-based deposition of quantum-confined thin films for optoelectronics. However, two significant challenges must be addressed before practical nanocrystal-based devices can be realized. The first is coping with the ligands that terminate the nanocrystal surfaces. Though ligands provide the colloidal stability needed to cast thin films from solution, these ligands dramatically hinder charge carrier transport in the resulting film. Second, after a conductive film is achieved, doping has proven difficult for further control of the optoelectronic properties of the film. Here we report the ability to confront both of these challenges by exploiting the ability of silicon to engage in hypervalent interactions with hard donor molecules. For the first time, we demonstrate the significant potential of applying the interaction to the nanocrystal surface. In this study, hypervalent interactions are shown to provide colloidal stability as well as doping of silicon nanocrystals.
Biological soliton in multicellular movement
Authors: Kuwayama Hidekazu , Ishida Shuji 
Published: July 2013

AbstractSolitons have been observed in various physical phenomena. Here, we show that the distinct characteristics of solitons are present in the mass cell movement of non-chemotactic mutants of the cellular slime mould Dictyostelium discoideum. During starvation, D. discoideum forms multicellular structures that differentiate into spore or stalk cells and, eventually, a fruiting body. Non-chemotactic mutant cells do not form multicellular structures; however, they do undergo mass cell movement in the form of a pulsatile soliton-like structure (SLS). We also found that SLS induction is mediated by adhesive cell-cell interactions. These observations provide novel insights into the mechanisms of biological solitons in multicellular movement.
Prefrontal cortical microcircuits bind perception to executive control
Authors: Opris Ioan , Santos Lucas , Gerhardt Greg A. , Song Dong , Berger Theodore W. , Hampson Robert E. , Deadwyler Sam A. 
Published: July 2013

AbstractDuring the perception-to-action cycle, our cerebral cortex mediates the interactions between the environment and the perceptual-executive systems of the brain. At the top of the executive hierarchy, prefrontal cortical microcircuits are assumed to bind perceptual and executive control information to guide goal-driven behavior. Here, we tested this hypothesis by comparing simultaneously recorded neuron firing in prefrontal cortical layers and the caudate-putamen of rhesus monkeys, trained in a spatial-versus-object, rule-based match-to-sample task. We found that during the perception and executive selection phases, cell firing in the localized prefrontal layers and caudate-putamen region exhibited similar location preferences on spatial-trials, but less on object- trials. Then, we facilitated the perceptual-executive circuit by stimulating the prefrontal infra-granular-layers with patterns previously derived from supra-granular-layers and produced stimulation-induced spatial preference in percent correct performance on spatial trials, similar to neural tuning. These results show that inter-laminar prefrontal microcircuits play causal roles to the perception-to-action cycle.
Stability of Measures From Children's Interviews: The Effects of Time, Sample Length, and Topic
Authors: Heilmann John , DeBrock Lindsay , Riley-Tillman T. Chris 
Published: July 2013

Purpose
The purpose of this study was to examine the reliability of, and sources of variability in, language measures from interviews collected from young school-age children.

Method
Two 10-min interviews were collected from 20 at-risk kindergarten children by an examiner using a standardized set of questions. Test–retest reliability coefficients were calculated for 8 language measures. Generalizability theory (G-theory) analyses were completed to document the variability introduced into the measures from the child, session, sample length, and topic.

Results
Significant and strong reliability correlation coefficients were observed for most of the language sample measures. The G-theory analyses revealed that most of the variance in the language measures was attributed to the child. Session, sample length, and topic accounted for negligible amounts of variance in most of the language measures.

Conclusion
Measures from interviews were reliable across sessions, and the sample length and topic did not have a substantial impact on the reliability of the language measures. Implications regarding the clinical feasibility of language sample analysis for assessment and progress monitoring are discussed.
Speech Sound Disorders in a Community Study of Preschool Children
Authors: McLeod Sharynne , Harrison Linda J. , McAllister Lindy , McCormack Jane 
Published: July 2013

Purpose
To undertake a community (nonclinical) study to describe the speech of preschool children who had been identified by parents/teachers as having difficulties “talking and making speech sounds” and compare the speech characteristics of those who had and had not accessed the services of a speech-language pathologist (SLP).

Method
Stage 1: Parent/teacher concern regarding the speech skills of 1,097 4- to 5-year-old children attending early childhood centers was documented. Stage 2a: One hundred forty-three children who had been identified with concerns were assessed. Stage 2b: Parents returned questionnaires about service access for 109 children.

Results

The majority of the 143 children (86.7%) achieved a standard score below the normal range for the percentage of consonants correct (PCC) on the Diagnostic Evaluation of Articulation and Phonology (Dodd, Hua, Crosbie, Holm, & Ozanne, 2002). Consonants produced
incorrectly
were consistent with the late-8 phonemes (Shriberg, 1993). Common phonological patterns were fricative simplification (82.5%), cluster simplification (49.0%)/reduction (19.6%), gliding (41.3%), and palatal fronting (15.4%). Interdental lisps on /s/ and /z/ were produced by 39.9% of the children, dentalization of other sibilants by 17.5%, and lateral lisps by 13.3%. Despite parent/teacher concern, only 41/109 children had contact with an SLP. These children were more likely to be unintelligible to strangers, to express distress about their speech, and to have a lower PCC and a smaller consonant inventory compared to the children who had no contact with an SLP.

Conclusion
A significant number of preschool-age children with speech sound disorders (SSD) have not had contact with an SLP. These children have mild-severe SSD and would benefit from SLP intervention. Integrated SLP services within early childhood communities would enable earlier identification of SSD and access to intervention to reduce potential educational and social impacts affiliated with SSD.
Line Spread as a Visual Clinical Tool for Thickened Liquids
Authors: Lund Annelise Masters , Garcia Jane Mertz , Chambers Edgar 
Published: July 2013

Purpose
Preparing modified liquids to a target level of consistency is critical to patients' nutritional care. This study examined the relationship of line spread (i.e., the distance a liquid flows) to viscometer measurements for a variety of product/liquid combinations and determined if flow distance visually differentiated nectar-thick versus honey-like consistency.

Method
Combinations of 4 thickening products (3 starch-based and 1 gum-based thickener) prepared with 6 serving-temperature liquids that had various levels of fat, fiber, and added nutrients were tested. A total of 32 product/liquid combinations tested within the target range of 80–800 centipoise (cP). Measurements were recorded using line spread and a Brookfield RVDV-II+ viscometer.

Results
Nectar-thick and honey-like consistencies significantly differed in their degree of line spread. Using our line spread apparatus, a value of 4.5 cm differentiated between nectar-thick and honey-like consistencies. There was an inverse correlation (−.75) between viscometer data and line spread results. That is, high viscosity values represented samples with less flow distance (line spread), and low viscosity values represented samples with more flow distance.

Conclusion
Line spread appears to be a quick, objective, and visual method that might be used to help patients and their caregivers achieve more accurate and consistent thickened liquid preparation.