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1.
Lussier Isabelle; Derevensky Jeffrey L.; Gupta Rina; Bergevin Tanya; Ellenbogen Stephen 《Canadian Metallurgical Quarterly》2007,21(2):165
The study of resilient children has overturned many deficit-focused models concerning the ontogenesis of children raised in adversity. This study explored the relationship between risk and protective factors, resilience, and youth gambling behavior. More specifically, this study examined the relative contribution of various risk and protective domains in relation to problem gambling behavior and examined whether youth identified as resilient (high risk exposure- high internalized protection) were as likely as those identified as vulnerable (high risk exposure-low internalized protection) to engage in excessive gambling behavior. The sample consisted of 1,273 students ages 12 to 19. The findings demonstrated that risk and protective factors each provide a unique contribution to the prediction model of gambling problems. Resilient and vulnerable youth differed significantly in their self-reported gambling severity. As well, resilient youth were not statistically distinguishable from low-risk exposure groups in terms of their gambling severity. Findings are interpreted with respect to resilience and prevention research. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
2.
Although the basal ganglia have been shown to be critical for the expression of emotion in prosody and facial expressions, it is unclear whether they are also critical for recognition of emotions. Selective pathology of parts of the basal ganglia is a hallmark of individuals with Parkinson's disease, and such patients have been examined in several studies of emotion. We examined 18 patients with Parkinson's disease (11 men, 7 women) and 13 age-, education-, gender ratio-, and IQ-matched normal controls on their ability to recognize emotions signaled by facial expressions. Parkinson's patients performed entirely normally on a quantitative task of recognizing emotional facial expressions. The findings do not support the notion that the sectors of basal ganglia that are dysfunctional in Parkinson's disease are essential for recognizing emotion in facial expressions. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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AND/OR search spaces accommodate advanced algorithmic schemes for graphical models which can exploit the structure of the
model. We extend and evaluate the depth-first and best-first AND/OR search algorithms to solving 0-1 Integer Linear Programs (0-1 ILP) within this framework. We also include a class
of dynamic variable ordering heuristics while exploring an AND/OR search tree for 0-1 ILPs. We demonstrate the effectiveness
of these search algorithms on a variety of benchmarks, including real-world combinatorial auctions, random uncapacitated warehouse
location problems and MAX-SAT instances. 相似文献
5.
There are two main solving schemas for constraint satisfaction and optimization problems: i) search, whose basic step is branching over the values of a variables, and ii) dynamic programming, whose basic step is variable elimination. Variable elimination is time and space exponential in a graph parameter called induced width, which renders the approach infeasible for many problem classes. However, by restricting variable elimination so that only low arity constraints are processed and recorded, it can be effectively combined with search, because the elimination of variables may reduce drastically the search tree size.In this paper we introduce BE-BB(k), a hybrid general algorithm that combines search and variable elimination. The parameter k controls the tradeoff between the two strategies. The algorithm is space exponential in k. Regarding time, we show that its complexity is bounded by k and a structural parameter from the constraint graph. We provide experimental evidence that the hybrid algorithm can outperform state-of-the-art algorithms in constraint satisfaction, Max-CSP and Weighted CSP. Especially in optimization tasks, the advantage of our approach over plain search can be overwhelming. 相似文献
6.
Rina Cohen 《Canadian Journal of Science, Mathematics, & Technology Education》2013,13(3):365-368
Constance Kamii. (1990). Multiplication of two‐digit numbers: Two teachers using Piaget's theory. [Videotape.] New York: Teachers College Press. ISBN 0–8077–3086–6, Cdn $86. 相似文献
7.
Nurit Hadas Rina Hershkowitz Baruch B. Schwarz 《Canadian Journal of Science, Mathematics, & Technology Education》2013,13(4):529-552
Abstract The goal of this study is to show that inquiry activities in a dynamic geometry environment, intentionally designed to confront students with contradictions and uncertainties, push them towards explanations that include deductive elements. Three different but dependent aspects of the activities are characterized and analysed: The epistemological, which includes all possible inquiry paths; the didactic, which involves only those paths that reflect the intention of the designer; and the cognitive, which accounts for actual student actions (conjectures and explanations) and their analyses. The research conclusions are based on the interplay among these three aspects. The analysis of students’ investigations and the analysis of their explanations fulfil, to a broad extent, the design goals. 相似文献
8.
Bio-based polyfurfuryl alcohol (PFA) matrix nanocomposites were fabricated by in situ polymerization of furfuryl alcohol (FA) using (natural or organomodified) montmorillonite nanoclays (MMT) or cellulose whiskers (CW) as catalysts and as matrix modifiers, providing enhanced thermal performance. FTIR analysis shows the catalyst-dependent formation of gamma-diketones that are generated from hydrolytic ring cleavage of the furan rings along the PFA chain. Thermogravimetric Analysis (TGA) shows that the PFA-based nanocomposites exhibit a notable increase in the onset of degradation temperature compared to pure PFA. The oxidative degradation behavior, including degradation onset temperature and residual weight, was analyzed and compared for the various nanocomposites. The higher thermal stability of 30BMMT–PFA as compared with NaMMT–PFA is tentatively attributed to blocking of Brönstedt acidic sites on the clay surface by residues of the organic modifier. However, the highest thermal stability among the various PFA-based nanocomposites that were studied in this work was observed in those containing nanocellulose whiskers (CW), even at much lower volume loadings. Finally, in addition to their surprisingly remarkable thermal stability, CW–PFA nanocomposites also exhibited improved mechanical toughness over previously reported PFA systems. 相似文献
9.
Khanum F Anilakumar KR Viswanathan KR 《Critical reviews in food science and nutrition》2004,44(6):479-488
Garlic is a popular spice added to several edible preparations and is a remedy for a variety of ailments. Epidemeological as well as laboratory studies have shown that garlic consumption reduces certain cancer incidences in the stomach, colon, mammary, cervical, etc. This article focuses on the general chemistry, metabolism, anticarcinogenic properties, mechanism of action behind the anticarcinogenic effects, functional foods based on garlic; and future areas of research. Garlic has been shown to metabolized into N-aceryl-S-allyl cysteine, allyl mercaptan, diallyl disulfide, diallyl sulfide, diallyl sulfoxide, diallyl sulfone, and allyl methyl sulfide. Garlic has been thought to bring about its anticarcinogenic effect through a number of mechanisms, such as the scavenging of radicals, increasing gluathione levels, increasing the activities of enzymes such as glutathione S-transferase, catalase, inhibition of cytochrome p4502E1, DNA repair mechanisms, prevention of chromosomal damage etc. Future research should standardize the dosage of garlic and type, ie., whether it should be taken fresh, cooked, or aged. The formulation of odorless functional foods with the retention of anticarcinogenic activity should be further studied. 相似文献
10.
ieved in the study of gynecological cancers,early diagnosis,early treatment and valid recognition of precancerous stage are still the priority of therapy.The standardization of treatment on gynecological cancers remains to be generalized and the surgeries are prone to be humanize and individuate.The technique of clinical treatment should be based on evidence-based medicine and cooperation of multi-ceneri和L.hilgardii无法加以区分,但是仍有助于将未知杆菌归入这一群。 相似文献