University of New Brunswick

About: University of New Brunswick is a education organization based out in Fredericton, New Brunswick, Canada. It is known for research contribution in the topics: Population & Context (language use). The organization has 10498 authors who have published 20654 publications receiving 474448 citations.

An American Dilemma: The Negro problem and modern democracy

Abstract: Resenha sobre “ An American Dilemma: The Negro problem and modern democracy ” de Gunnar Myrdal

Premature or rapid ejaculation: heterosexual couples' perceptions of men's ejaculatory behavior.

Abstract: This study investigated the relationship between men's and their female partner's perceptions of men's ejaculatory behavior as well as the impact of premature or rapid ejaculation on couple functioning One hundred fifty-two men and their female partners provided information about the man's ejaculatory behavior, their perceptions of whether the man had a problem with premature or rapid ejaculation (RE), their sexual and relationship satisfaction, and their sexual concerns The men's and women's reports on the man's ejaculatory behavior were only moderately correlated In general, the women saw RE as less of a problem for the men than their male partners reported for themselves The women's perceptions of both the men's ejaculatory behavior and his affective responses were uniquely related to her own and her partner's identification of him as having an RE problem For both the men and the women, having more characteristics of RE was related to lower sexual satisfaction, but was unrelated to relationship satisfaction RE characteristics were also related to the number of non-RE sexual concerns reported by the men, but not to the number of sexual concerns reported by their female partner However, men and women who identified the man as having an RE problem rated RE as having only a slightly negative impact on their own or their partners functioning The results suggest that, for most couples, the timing of ejaculation adversely affects sexual satisfaction but not overall relationship and personal functioning

Contribution of Mg2Si precipitates to the strength of direct metal laser sintered AlSi10Mg

Abstract: Microstructure of deformed DMLS-AlSi10Mg under quasi-static loading was studied using TEM to elaborate the strengthening mechanisms. In addition to Orowan (due to presence of Si precipitates), Hall-Petch (due to eutectic Si walls), and dislocation hardening (due to pre-existing entangled dislocations) mechanisms, Mg2Si precipitates (colonies) contributed to the strength of alloy by impeding dislocation motion. The level of this contribution was evaluated as ~13 MPa by comparing the modeled and measured yield strength.

Modelling Spatial Point Patterns in R

Abstract: We describe practical techniques for fitting stochastic models to spatial point pattern data in the statistical package R. The techniques have been implemented in our package spatstat in R. They are demonstrated on two example datasets.

Barcoding a quantified food web: crypsis, concepts, ecology and hypotheses.

Abstract: The efficient and effective monitoring of individuals and populations is critically dependent on correct species identification. While this point may seem obvious, identifying the majority of the more than 100 natural enemies involved in the spruce budworm (Choristoneura fumiferana – SBW) food web remains a non-trivial endeavor. Insect parasitoids play a major role in the processes governing the population dynamics of SBW throughout eastern North America. However, these species are at the leading edge of the taxonomic impediment and integrating standardized identification capacity into existing field programs would provide clear benefits. We asked to what extent DNA barcoding the SBW food web would alter our understanding of the diversity and connectence of the food web and the frequency of generalists vs. specialists in different forest habitats. We DNA barcoded over 10% of the insects collected from the SBW food web in three New Brunswick forest plots from 1983 to 1993. For 30% of these specimens, we amplified at least one additional nuclear region. When the nodes of the food web were estimated based on barcode divergences (using molecular operational taxonomic units (MOTU) or phylogenetic diversity (PD) – the food web became much more diverse and connectence was reduced. We tested one measure of food web structure (the “bird feeder effect”) and found no difference compared to the morphologically based predictions. Many, but not all, of the presumably polyphagous parasitoids now appear to be morphologically-cryptic host-specialists. To our knowledge, this project is the first to barcode a food web in which interactions have already been well-documented and described in space, time and abundance. It is poised to be a system in which field-based methods permit the identification capacity required by forestry scientists. Food web barcoding provided an effective tool for the accurate identification of all species involved in the cascading effects of future budworm outbreaks. Integrating standardized barcodes within food webs may ultimately change the face of community ecology. This will be most poignantly felt in food webs that have not yet been quantified. Here, more accurate and precise connections will be within the grasp of any researcher for the first time.