bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of nanoclay on positive temperature coefficient to resistivity characteristics of high density polyethylene/silver‐coated glass bead composites
Authors: Sridhar M.V. , Kar Prativa , Shrivastava N. , Khatua B.B. 
Published: April 2012

AbstractPositive temperature coefficient to resistivity characteristics of high density polyethylene (HDPE)/silver (Ag)‐coated glass bead (45 wt%) composites, without and with nanoclay, has been investigated with reference to HDPE/carbon black (CB) (10 wt%) composites. Plot of resistivity versus temperature of HDPE/CB (10 wt%) composites showed a sudden rise in resistivity (PTC trip) at ≈128°C, close to the melting temperature (Tm) of HDPE. However, for HDPE/Ag coated glass bead (45 wt%) composites, the PTC trip temperature (≈88°C) appeared well below the Tm of HDPE. Addition of 1 phr clay in the composites resulted in an increase in PTC trip temperature of HDPE/Ag‐coated glass bead (45 wt%) composites, whereas no significant effect of clay on PTC trip temperature was evident in HDPE/CB/clay composites. We proposed that the PTC trip temperature in HDPE/Ag‐coated glass bead composites was governed by the difference in coefficient of thermal expansion of HDPE and Ag‐coated glass beads. The room temperature resistivity and PTC trip temperature of HDPE/Ag‐coated glass bead (45 wt%) composites were found to be very stable on thermal cycling. Dynamic mechanical analyzer results showed higher storage modulus of HDPE/Ag‐coated glass bead (45 wt%) composites compared with the HDPE/CB (10 wt%) composites. Thermal stability of HDPE/Ag‐coated glass bead (45 wt%) composites was also improved compared with that of HDPE/CB (10 wt%) composites. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers
Thermal and morphological properties of PVA/4‐vinylbenzene boronic acid hybrid nanofibrous
Authors: Baştürk Emre , Kahraman Memet Vezir 
Published: April 2012

AbstractThe aim of this study was to investigate the preparation and characterization of PVA and PVA/4‐VBBA (4‐Vinylbenzene boronic acid) hybrid electrospun nanofiber mat. PVA was mixed with cross‐linkable 4‐Vinylbenzene boronic acid (4‐VBBA), enabling the polymer to cross‐link upon UV irradiation. The photo‐cross‐linking reaction was characterized by a Fourier transform infrared spectroscopy. The structure and morphology of electrospun membranes were investigated by scanning electron microscopy (SEM). SEM images showed that the nanofiber diameter and the nanostructured morphology depended on solution viscosity, applied electric voltage(AV), tip to collector distance (TCD), and the amount of the 4‐VBBA. The thermal properties of PVA and PVA/4‐VBBA hybrid nanofibers were investigated by thermo gravimetric analysis. The photo‐crosslinked nanofibers were insoluble in water. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers
Maternal effects shape dynamic trajectories of reproductive allocation in the ladybirdColeomegilla maculata
Authors: Vargas G. , Michaud J.P. , Nechols J.R. 
Published: April 2012

AbstractWe followed lifetime trajectories of reproductive allocation inColeomegilla maculatafemales of three different size classes produced by rearing beetles on three different daily larval feeding regimes (30 min, 6 h orad libitumaccess to eggs ofEphestia kuehniella). We hypothesized that small females would produce fewer and smaller eggs than larger females and that reproductive effort would decline with female age. Females were mated with a male from the same treatment and then isolated withad libitumfood for their entire adult lives. Egg size increased over time in all treatments; small females started off laying the smallest eggs, but increased egg size more rapidly than larger females, until all treatments converged on a similar egg size around the 20th day of oviposition. Large females realized a larger proportion of their fecundity early in life, but smaller females increased daily fecundity over time. Reproductive effort (egg mass/body mass) did not decline over 30 oviposition days; it remained constant in large females, but increased among small and medium females, suggesting gradual compensation for larval food deprivation. An increase in egg size with maternal age may be an adaptive strategy to maximize fitness on ephemeral patches of aphid prey, assuming females reproduce in a single aphid outbreak and that offspring produced later in the aphid cycle experience greater competition and risk of mortality compared to those produced earlier. We demonstrate for the first time in Coleoptera that dynamic changes in both egg size and number occur as a function of female age and illustrate that such changes are constrained by larval feeding histories via their effects on maternal body size.
The Cypriot Exemption from Evocatio and the Character of Cicero's Proconsulship
Authors: ZARECKI JONATHAN 
Published: April 2012

Q. Volusium, tui Tiberi generum, certum hominem et mirifice abstinentem, misi in Cyprum ut ibi pauculos dies esset, ne cives Romani pauci qui illic negotiantur ius sibi dictum negarent; nam evocari ex insula Cyprios non licet. (Cic. Att. 5.21.6)I sent Quintus Volusius, the son-in-law of your friend Tiberius, a man both trustworthy and extraordinarily moderate, to Cyprus for only a couple of days, lest the few Roman citizens who do business there should claim that they had no legal recourse available to them, since it is not permitted for Cypriots to be summoned off the island.Scholars have taken slight notice (if they mention it at all) of Cicero's interesting comment that Cypriots were exempt from evocatio, the summons of a defendant or witness to a legal proceeding by a Roman magistrate with imperium. While the legal ramifications of the ban on evocatio on Cyprus are clear, the origin of this exemption is not. The only explicit theory on its origin – Badian's argument that the prohibition was part of Lentulus' lex provinciae, a law for the formal organization of the province of Cyprus – has been influential, though it is based on tenuous evidence. Few ancient sources for Roman rule on Cyprus during the Late Republic have survived, and we must rely almost entirely on Cicero's letters. Cicero's correspondence, however, indicates (against Badian) that the ban on evocatio was a codicil of Cicero's provincial edict, and not a part of either Lentulus' lex provinciae or his provincial edict. Personal, political, and military considerations all played a role in Cicero's decision to make the citizens of Cyprus exempt from being called to the administrative gathering for the dispensation of justice and other legal and political matters known as a conventus.
Did ‘Respectable’ Women Attend Symposia?
Authors: CORNER SEAN 
Published: April 2012

In her article, ‘Women's Commensality in the Ancient Greek World', which appeared in this journal in 1998, Joan Burton set out to correct scholars’ neglect of ‘the topic of women's part in the history of ancient Greek dining and drinking parties’. She argued that the proposition that citizen women never participated in symposia is a broad generalization. Based on classical Athenian evidence, it misses variation over time and in different places. Even in the case of classical Athens it is overstated, overlooking the male bias of our sources. Moreover, scholars' concentration on the symposium has led to the neglect of other occasions of commensality and so of the important role played by women in Greek commensality more broadly:the participation of women in the history of Greek commensality does not depend solely on female presence at male-defined symposia. Just as men had a wide range of venues in which they might socialize with one another, including public banquets (many of them religious), so too women.
The Peaceful Conspiracy: Bond Markets and International Relations During the Pax Britannica
Authors: Flandreau Marc , Flores Juan H. 
Published: April 2012

AbstractThis article provides foundations to Polanyi's famed argument that monopoly power in the global capital market served as an instrument of peace during the Pax Britannica (1815–1914). Our perspective is novel—we focus on the role of intermediaries and certification. We show that when information and enforcement are imperfect, there is scope for the endogenous emergence of “prestigious” intermediaries who enjoy a monopoly position and as a result, control government actions. They can implement conditional lending: they subject the distribution of credit to the adoption of peaceful policies. Prestigious intermediaries act that way because of their concern with maintaining an unblemished track record when wars increased risks of default. Our analysis, which brings together insights from different disciplines, provides a significant extension to, and departure from, recent research on how countries accumulate reputational capital.
Do IMF and World Bank Programs Induce Government Crises? An Empirical Analysis
Authors: Dreher Axel , Gassebner Martin 
Published: April 2012

AbstractWe examine whether and under what circumstances World Bank and International Monetary Fund (IMF) programs affect the likelihood of major government crises. We find that crises are, on average, more likely as a consequence of World Bank programs. We also find that governments face an increasing risk of entering a crisis when they remain under an IMF or World Bank arrangement once the economy's performance improves. The international financial institution's (IFI) scapegoat function thus seems to lose its value when the need for financial support is less urgent. While the probability of a crisis increases when a government turns to the IFIs, programs inherited by preceding governments do not affect the probability of a crisis. This is in line with two interpretations. First, the conclusion of IFI programs can signal the government's incompetence, and second, governments that inherit programs might be less likely to implement program conditions agreed to by their predecessors.
Comparison of responses to dietary protein and lysine in broiler chicks reared before and after 2000 via neural network models
Authors: FARIDI A. , GOLIAN A. , AHMADI H. 
Published: April 2012

SUMMARYThe current study was conducted to compare the responses of broiler chicks (average daily gain (ADG) and feed efficiency (FE)) raised before and after 2000 to dietary protein and lysine through neural networks (NN). The available lysine dose-response data were extracted from the literature and arbitrarily divided into two sets of before and after 2000. The training and testing data sets derived from each group were used to develop the NN models. The developed models were subjected to a sensitivity analysis test to assess the relative importance of dietary protein and lysine on chicks’ responses. An optimization algorithm was used to find the dietary protein and lysine required for maximum ADG and FE, based on each dataset. The results showed that the NN models developed could predict ADG and FE efficiently in broiler chicks of before and after 2000, and the higher accuracies of prediction were attained by these models compared to those of regression models. Sensitivity analysis indicated that ADG and FE were more sensitive to dietary lysine, compared to protein, in both time periods. Based on the optimization results, the protein and lysine requirements for maximum ADG or FE for birds reared after 2000 were lower and higher, respectively, compared to those reared before 2000. The protein requirements for maximum ADG and FE for birds reared before 2000 were 241·3 and 247·0 g/kg diet and for lysine 10·76 and 11·18 g/kg diet, respectively. In birds reared after 2000, maximum ADG was obtained when the diet contained 224·30 g protein/kg diet and 11·75 g lysine/kg diet, whereas maximum FE was achieved with a diet containing 228·3 g protein and 13·1 g lysine.
Prospective study of family adversity and maladaptive parenting in childhood and borderline personality disorder symptoms in a non-clinical population at 11 years
Authors: Winsper C. , Zanarini M. , Wolke D. 
Published: April 2012

BackgroundRetrospective studies have consistently indicated an association between maladaptive parenting and borderline personality disorder (BPD). This requires corroboration with prospective, longitudinal designs. We investigated the association between suboptimal parenting and parent conflict in childhood and BPD symptoms in late childhood using a prospective sample.MethodA community sample of 6050 mothers and their children (born between April 1991 and December 1992) were assessed. Mothers' family adversity was assessed during pregnancy and parenting behaviours such as hitting, shouting, hostility and parent conflict across childhood. Intelligence quotient (IQ) and DSM-IV Axis I diagnoses were assessed at 7–8 years. Trained psychologists interviewed children at 11 years (mean age 11.74 years) to ascertain BPD symptoms.ResultsAfter adjustment for confounders, family adversity in pregnancy predicted BPD probable 1 to 2 adversities: odds ratio (OR)=1.34 [95% confidence interval (CI) 1.01–1.77]; >2 adversities: OR 1.99 (95% CI 1.34–2.94) and definite 1 to 2 adversities: OR 2.48 (95% CI 1.01–6.08) symptoms. Each point increase in the suboptimal parenting index predicted BPD probable: OR 1.13 (95% CI 1.05–1.23) and definite: OR 1.28 (95% CI 1.03–1.60) symptoms. Parent conflict predicted BPD probable: OR 1.19 (95% CI 1.06–1.34) and definite: OR 1.42 (95% CI 1.06–1.91) symptoms. Within the path analysis, the association between suboptimal parenting and BPD outcome was partially mediated by DSM-IV diagnoses and IQ at 7–8 years.ConclusionsChildren from adverse family backgrounds, who experience suboptimal parenting and more conflict between parents, have poor cognitive abilities and a DSM-IV diagnosis, are at increased risk of BPD symptoms at 11 years.
Le détachement d'objets indirects antéposés dans des énoncés à sujet inversé
Authors: FUCHS CATHERINE 
Published: April 2012

ABSTRACTL’étude porte sur les compléments enàetdeplacés à l'initiale d'un énoncé comportant une inversion du sujet nominal. Elle vise à comprendre pourquoi ces compléments sont parfois détachés à l'aide d'une virgule. L'observation de corpus textuels conduit à considérer que la présence ou l'absence de virgule signale deux constructions distinctes: dans la perspective théorique des approches macro-syntaxiques de l’énoncé en termes de ‘noyau’ / ‘affixes’, le complément initial suivi d'une virgule est analysé comme un préfixe détaché co-indexé au terme (vide) de départ du noyau, alors que dans la construction sans virgule le complément initial est intégré au noyau dont il occupe la première position. A cette différence syntaxique correspond une différence dans le mode de structuration informationnelle de l’énoncé (proposition catégorique ayant le complément pour thème et le noyau pour rhème et/ou focusvs. proposition thétique), qui elle-même induit deux types différents de stratégies discursives.
Validation of reference genes for ovarian tissue from capuchin monkeys (Cebus apella)
Authors: Brito A.B. , Lima J.S. , Brito D.C. , Santana L.N. , Costa N.N. , Miranda M.S. , Ohashi O.M. , Santos R.R. , Domingues S.F.S. 
Published: April 2012

SummaryThere is no tradition in studies reporting the effect of exposure to cryoprotectants or simply hypoxia and hypothermia on gene expression in the ovarian tissue and there has been only one study on reference or target genes quantification, and comparisons of normoxic with hypoxic, hypothermic and toxic conditions. Our aim in the present study was to investigate the stability of three reference genes in the ovarian tissue of capuchin monkeys (Cebus apella). To this end, fresh and cryoprotectant-exposed ovarian biopsies were used. Both fresh and exposed ovarian tissues were subjected to total RNA extraction and synthesis of cDNA. cDNA was amplified by real-time polymerase chain reaction (PCR), and GeNorm, BestKeeper and NormFinder software were used to evaluate the stability of glyceraldehyde-2-phosphate dehydrogenase (GAPDH), hypoxanthine phosphoribosyltransferase 1 (HPRT1) and TATA-binding protein (TBP). Results demonstrated that, in the ovarian tissue from capuchin monkeys, HPRT1 and TBP were the most suitable reference genes and thus could be used as parameters to normalize data in future studies. In contrast, GAPDH appeared as the least stable gene among the tested reference genes. In conclusion, HPRT1 and TBP were the most stable reference genes in fresh and cryoprotectant-exposed ovarian tissue from capuchin monkeys.
Effects of ascorbic acid on in vitro culture of bovine preantral follicles
Authors: Andrade Evelyn R. , van den Hurk Robert , Lisboa Lívia A. , Hertel Mariana F. , Melo-Sterza Fabiana A. , Moreno Kleber , Bracarense Ana Paula F. R. L. , Landim-Alvarenga Fernanda C. , Seneda Marcelo M. , Alfieri Amauri A. 
Published: April 2012

SummaryThe objective of this study was to evaluate the effects of adding ascorbic acid to the media for in vitro culture of cattle ovarian fragments and to determine their effects on growth activation and viability of early-stage follicles. The ovarian cortex was divided into small fragments; one fragment was immediately fixed (control) and the other fragments were cultured in minimum essential medium (MEM) supplemented or not with various doses of ascorbic acid. Ovarian tissue was processed for histology, transmission electron microscopy (TEM) and immunohistochemical demonstration of proliferating cell nuclear antigen (PCNA). Compared with control fragments, the percentage of primordial follicles was reduced (p < 0.05) and the percentage of growing follicles had increased (p < 0.05) in cultured cortical fragments, independent of the tested medium or incubation time. Furthermore, compared with control tissue, culture of ovarian cortex for 8 days reduced the percentages of healthy, viable follicles (p < 0.05), but not when cultures were supplemented with 25, 50 or 100 μg/ml of ascorbic acid. Ultrastructural and immunohistochemical analysis of 8 day cultured ovarian cortical fragments, however, showed the integrity and viability of follicles only when fragments were cultured in presence of 50 μg/ml of ascorbic acid. In conclusion, this study demonstrated that addition of ascorbic acid to MEM at a concentration of 50 μg/ml not only stimulates the activation of 8 day in vitro cultured cattle primordial follicles and subsequent growth of activated follicles, but also safeguards the viability of these early-stage follicles.
Comparative effects of surgical and percutaneous repair on P-wave and atrioventricular conduction in patients with atrial septal defect – ostium secundum type
Authors: Javadzadegan Hassan , Toufan Mehrnoush , Sadighi Ali Reza , Chang Joyce M. , Nader Nader D. 
Published: April 2012

AbstractBoth surgical and percutaneous closures of atrial septal defects have been successful in reversal of atrial dilatation. We compared the effects of surgical and percutaneous transvenous device closure of atrial septal defect on post-operative changes of P-wave duration, PR segment, and PR interval. Electrocardiographic data were prospectively collected from 30 patients following either surgical (n equal to 16) or percutaneous (n equal to 16) repair of atrial septal defects between 2004 and 2010. A cardiologist blinded to the closure technique performed the electrocardiographic analyses. P-wave duration (98.5 plus or minus 15.4 to 86.4 plus or minus 13.2 milliseconds, p-value less than 0.05) and PR interval (162.9 plus or minus 18.5 to 140.6 plus or minus 15.2 milliseconds, p-value less than 0.05) were reduced after percutaneous transvenous device closure. P-wave duration (104.5 plus or minus 24.7 versus 83.2 plus or minus 13.3 milliseconds, p-value less than 0.05) and PR interval (173.2 plus or minus 38.7 versus 144.3 plus or minus 32.0 milliseconds, p-value less than 0.05) were also reduced after surgical closure. PR segment in the percutaneous group was significantly reduced (63.4 plus or minus 14.5 to 52.1 plus or minus 10.8 milliseconds, p-value less than 0.05), but not in the surgical group (68.6 plus or minus 18.7 versus 61.1 plus or minus 24.7 milliseconds). However, the difference in PR segment changes between the two groups was not significant (−11.3 plus or minus 15.0 versus −7.6 plus or minus 20.5 milliseconds, p-value equal to 0.18). Our analysis demonstrates that the changes between the two groups were not different and that both closure techniques reduce P-wave duration, PR segment, and PR interval within 6 months.
On the automorphy of l-adic Galois representations with small residual image With an appendix by Robert Guralnick, Florian Herzig, Richard Taylor and Jack Thorne
Authors: Thorne Jack 
Published: April 2012

AbstractWe prove new automorphy lifting theorems for essentially conjugate self-dual Galois representations into GLn. Existing theorems require that the residual representation have ‘big’ image, in a certain technical sense. Our theorems are based on a strengthening of the Taylor–Wiles method which allows one to weaken this hypothesis.
Hydrological deformation induced by the West African Monsoon: Comparison of GPS, GRACE and loading models
Authors: Nahmani Samuel , Bock Olivier , Bouin Marie‐Noëlle , Santamaría‐Gómez Alvaro , Boy Jean‐Paul , Collilieux Xavier , Métivier Laurent , Panet Isabelle , Genthon Pierre , de Linage Caroline , Wöppelmann Guy 
Published: April 2012

Three‐dimensional ground deformation measured with permanent GPS stations in West Africa was used for investigating the hydrological loading deformation associated with Monsoon precipitation. The GPS data were processed within a global network for the 2003–2008 period. Weekly station positions were retrieved with a repeatability (including unmodeled loading effects) of 1–2 mm in the horizontal components and between 2.5 and 6 mm in the vertical component. The annual signal in the vertical component for sites located between 9.6°N and 16.7°N is in the range 10–15 mm. It is consistent at the 3 mm‐level with the annual regional‐scale loading deformations estimated from GRACE satellite products and modeled with a combination of hydrological, atmospheric, and nontidal oceanic models. An additional 6 month transient signal was detected in the vertical component of GPS estimates at most of the West African sites. It takes the form of an oscillation occurring between September and March, and reaching a maximum amplitude of 12–16 mm at Ouagadougou (12.5°N). The analysis of in situ hydro‐geological data revealed a strong coincidence between this transient signal and peak river discharge at three sites located along the Niger River (Timbuktu, Gao, and Niamey). At Ouagadougou, a similar coincidence was found with the seasonal variations of the water table depth. We propose a mechanism to account for this signal that involves a sequence of swelling/shrinking of clays combined with local loading effects associated with flooding of the Niger River.
Thermal behavior of 1,2-dipalmitoyl-sn-3-phosphoglycerocholine bi- and multi-layers, deposited with physical vapor deposition under ellipsometric growth control
Authors: H. Carmen González , Volkmann Ulrich G. , Retamal Maria J. , Cisternas Marcelo , Sarabia Mauricio A. , López Karina A. 
Published: April 2012

1,2-dipalmitoyl-sn-3-phosphoglycerocholine membranes were deposited onto a silicon substrate (Si/SiO2) using physical vapor deposition with in situ ellipsometric thickness control. Along several heating cycles it was possible to identify well-defined boundaries for gel, ripple, liquid crystalline, and fluid-disordered phases. Particularly, the second order transition between gel and ripple phase was clearly identified in the range of ∼28-34 °C using Raman spectroscopy. Atomic force microscopy and imaging ellipsometry (IE) were used to observe and characterize the ripple phase undulations of period λ = 20.8 nm and average height h = 19.95 nm along the temperature interval of ∼34 to 40 °C. Clusters/agglomerations heights of more than twice the membrane thickness were observed with IE, induced by heating cycles.