A travel guide to the canonical bundle formula

We survey known results on the canonical bundle formula and its applications in algebraic geometry.Comment: 17 pages, to appear in the Proceedings of the conference Birational Geometry and Moduli Space

Efeito de Embalagens e do tratamento com fungicida na qualidade de sementes de soja armazenadas.

Este trabalho objetivou avaliar o efeito de dois tipos de embalagens e do tratamento fungicida na qualidade de sementes de soja armazenadas. Sementes de soja das cultivares FT-Estrela e MT/BR 51 (Xingu), tratadas e não tratadas com os fungicidas tiofanato metílico, tolylfluanid, carbendazin e benomyl, foram armazenadas (em sacos de papel e em sacos de polietileno) em armazéns convencionais em Ponta Porã, MS e Rondonópolis, MT, respectivamente. Uma máquina da marca Amazone Transmix foi utilizada para fazer o tratamento. A cada 60 dias foram realizadas avaliações dos seguintes parâmetros: umidade das sementes, sanidade de sementes (blotter test), germinação padrão, vigor no tetrazólio, emergência em areia e emergência a campo. Não foi observado efeito negativo do tratamento com fungicida e do tipo de embalagem sobre a qualidade das sementes durante o período de armazenamento. De uma maneira geral, a germinação, o vigor das sementes e a emergência das plântulas foram mantidos durante o período de 180 dias de armazenamento. Observou-se melhor conservação das sementes tratadas com fungicidas durante o período em que elas ficaram armazenadas, em comparação às sementes não tratadas. Assim, ficou demonstrada a viabilidade técnica do tratamento de sementes de soja com fungicidas antes do armazenamento. Foi observada redução da germinação, emergência e vigor quando os fungicidas benzimidazóis (tiofanato metílico, carbendazin e benomyl) foram aplicados isoladamente às sementes de soja. Não foi observada variação significativa na umidade das sementes durante o período de armazenamento das mesmas.bitstream/item/69246/1/BP10-02-augusto.pd

Viabilidade técnica do tratamento de sementes de soja com fungicidas antes do armazenamento.

bitstream/item/38715/1/BP19992.pd

Life Style Factors Influencing Serum Pepsinogen Levels in Healthy Japanese: a Prospective Study

Background: Gastric cancer mass screening using serum pepsinogen has been recognized and several advantages of this methods over photofluorography have been shown by previous study. Aims: To determine the factors influence the serum pepsinogen levels in healthy subjects. Subjects & Methods: One thousand and one hundred fourteen subjects who were screened for gastric cancer as part of a periodic health check. Blood samples were taken after fasting and stored below –20 ° C, until pepsinogen levels were assayed. Results: The subjects consist of 338 males (mean age 52.6+14.0) and 776 females (mean age 49.0+11.9). Age ranges from 19 to 81 years. The overall prevalence of chronic atrophic gastritis using a criterion PG I £ 70 hg/ml and PG I/II ratio £ 3.0 was 21.99 % in 1996 and 23.97 % in 2000. Bivariate analysis revealed a significant association between age, more salt consumption, fish favorable over meat and less than three time meal intake covariates with the lowering of PG I/II ratio. Smoking, drinking, BMI, weight and gender did not affect the changes of PG I/II ratio. Conclusion: Age and more salt consumption covariates have a strongest association with the decreased of PG I/II by multivariate analysis

Superconducting and structural properties of the type-I superconductor PdTe₂ under high pressure

The transition metal dichalcogenide PdTe$_2$ has attractive features based on its classification as a type-II Dirac semimetal and the occurrence of type-I superconductivity, providing a platform for discussion of a topological superconductor. Our recent work revealed that type-I superconductivity persists up to pressures of $\sim2.5$ GPa and the superconducting transition temperature $T_{\rm c}$ reaches a maximum at around 1 GPa, which is inconsistent with the theoretical prediction. To understand its non-monotonic variation and investigate superconductivity at higher pressures, we performed structural analysis by x-ray diffraction at room temperature below 8 GPa and electrical resistivity measurements at low temperatures from 1 to 8 GPa. With regard to the superconductivity beyond 1 GPa, the monotonic decrease in $T_{\rm c}$ is reproduced without any noticeable anomalies; $T_{\rm c}$ changes from 1.8 K at 1 GPa to 0.82 K at 5.5 GPa with $dT_{\rm c}/dP\sim-0.22$ K/GPa. The crystal structure with spacegroup $P$\={3}$m$1 is stable in the pressure range we examined. On the other hand, the normalized pressure-strain analysis (finite strain analysis) indicates that the compressibility changes around 1 GPa, suggesting that a Lifshitz transition occurs. We here discuss the effect of pressure on the superconducting and structural properties based on the comparison of these experimental results

Fibrations on four-folds with trivial canonical bundles

Four-folds with trivial canonical bundles are divided into six classes according to their holonomy group. We consider examples that are fibred by abelian surfaces over the projective plane. We construct such fibrations in five of the six classes, and prove that there is no such fibration in the sixth class. We classify all such fibrations whose generic fibre is the Jacobian of a genus two curve.Comment: 28 page

Combinatorial discovery of a lead-free morphotropic phase boundary in a thin-film piezoelectric perovskite

We report on the discovery of a lead-free morphotropic phase boundary in Sm doped BiFeO3 with a simple perovskite structure using the combinatorial thin film strategy. The boundary is a rhombohedral to pseudo-orthorhombic structural transition which exhibits a ferroelectric (FE) to antiferroelectric (AFE) transition at approximately Bi0.86Sm0.14FeO3 with dielectric constant and out-of-plane piezoelectric coefficient comparable to those of epitaxial (001) oriented Pb(Zr,Ti)O3 (PZT) thin films at the MPB. The discovered composition may be a strong candidate of a Pb-free piezoelectric replacement of PZT.Comment: 16 pages, 5 figures, submitted to Applied Physics Letter

Collaborative roles of Temporoparietal Junction and Dorsolateral Prefrontal Cortex in Different Types of Behavioural Flexibility

Behavioural flexibility is essential for everyday life. This involves shifting attention between different perspectives. Previous studies suggest that flexibility is mainly subserved by the dorsolateral prefrontal cortex (DLPFC). However, although rarely emphasized, the temporoparietal junction (TPJ) is frequently recruited during flexible behaviour. A crucial question is whether TPJ plays a role in different types of flexibility, compared to its limited role in perceptual flexibility. We hypothesized that TPJ activity during diverse flexibility tasks plays a common role in stimulus-driven attention-shifting, thereby contributing to different types of flexibility, and thus the collaboration between DLPFC and TPJ might serve as a more appropriate mechanism than DLPFC alone. We used fMRI to measure DLPFC/TPJ activity recruited during moral flexibility, and examined its effect on other domains of flexibility (economic/perceptual). Here, we show the additional, yet crucial role of TPJ: a combined DLPFC/TPJ activity predicted flexibility, regardless of domain. Different types of flexibility might rely on more basic attention-shifting, which highlights the behavioural significance of alternatives.Peer reviewe