The origin,limits and future of mother tongues     

Olga Mitrofanova  Yulia Desherieva 《Prospects》1987,17(3):460-468

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Noun phrases in interactive query expansion and document ranking     

Olga Vechtomova 《Information Retrieval》2006,9(4):399-420

The paper presents several techniques for selecting noun phrases for interactive query expansion following pseudo-relevance feedback and a new phrase-based document ranking method. A combined syntactico-statistical method was used for the selection of phrases for query expansion. Several statistical measures of phrase selection were evaluated. Experiments were also conducted studying the effectiveness of noun phrases in document ranking. One of the major problems in phrase-based document retrieval is weighting of overlapping and non-contiguous word sequences in documents. The paper presents a new method of phrase weighting, which addressed this problem, and its evaluation on the TREC dataset.  相似文献   

Targeting Interventions: Moderators of the Effects of Expressive Writing and Assertiveness Training on the Adjustment of International University Students     

Hijazi AM  Tavakoli S  Slavin-Spenny OM  Lumley MA 《International journal for the advancement of counseling》2011,33(2):101-112

Acculturative stress is a common experience for international students and is associated with psychological and physical problems. In a previous study (Tavakoli et al. Journal of Counseling Psychology 56:590-596, 2009), the authors reported that two stress reduction interventions—expressive writing (EW) and assertiveness training (AT)—had limited overall benefits among international students at an American University. The current analyses of data from that study investigated whether individual differences moderated the effects of EW and AT. Results indicate that greater acculturative stress at baseline predicted greater improvement from both interventions. Additionally, women benefited more from AT than EW, except that EW improved women’s physical symptoms. Men benefited more from EW than AT. Students with limited emotional awareness and expression tended to benefit from both interventions. Finally, nation of origin cultural differences generally did not predict outcomes. It is concluded that the benefits of EW and AT can be enhanced by targeting these interventions to specific subgroups of international students.  相似文献   

Parental Behavior,Cognitive Appraisal,and Motivation in Young Athletes     

A. Rui Gomes  A. Manuela Gonçalves  Olga Dias  Catarina Morais 《Research quarterly for exercise and sport》2019,90(1):80-94

Purpose: This study tested two hypotheses relating young athletes’ sports motivations to parental behaviors and cognitive appraisal: (1) young athletes’ motivation in sports is related to their parents’ behavior; and (2) this relationship is mediated by cognitive appraisal, even after controlling for competitive level and sports records. Method: This cross-sectional study included 673 young athletes and it measured the athletes’ perceptions of parental behaviors, cognitive appraisal, and sports motivation. Results: Structural equation modeling confirmed Hypothesis 1–the mother’s behaviors accounted for 15 to 16% of the variance in sports motivation, and the father’s behaviors accounted for 12 to 21% of the variance. The correlation patterns differed according to whether the athletes were evaluating the mother’s or father’s behaviors. Hypothesis 2 also was confirmed, for cognitive appraisal partially mediated the relationship between the perception of parental behaviors and sports motivation (34% of the variance was accounted for by the perception of the mother’s behavior; 30% by the father’s). The mediating model did not vary with competitive level or sports records. Conclusion: Parental behaviors and cognitive appraisal need to be taken into account to understand young athletes’ sports motivations.  相似文献   

Discovery of carbon-based strongest and hardest amorphous material     

Shuangshuang Zhang  Zihe Li  Kun Luo  Julong He  Yufei Gao  Alexander V Soldatov  Vicente Benavides  Kaiyuan Shi  Anmin Nie  Bin Zhang  Wentao Hu  Mengdong Ma  Yong Liu  Bin Wen  Guoying Gao  Bing Liu  Yang Zhang  Yu Shu  Dongli Yu  Xiang-Feng Zhou  Zhisheng Zhao  Bo Xu  Lei Su  Guoqiang Yang  Olga P Chernogorova  Yongjun Tian 《国家科学评论(英文版)》2022,9(1)

Carbon is one of the most fascinating elements due to its structurally diverse allotropic forms stemming from its bonding varieties (sp, sp² and sp³). Exploring new forms of carbon has been the eternal theme of scientific research. Herein, we report on amorphous (AM) carbon materials with a high fraction of sp³ bonding recovered from compression of fullerene C₆₀ under high pressure and high temperature, previously unexplored. Analysis of photoluminescence and absorption spectra demonstrates that they are semiconducting with a bandgap range of 1.5–2.2 eV, comparable to that of widely used AM silicon. Comprehensive mechanical tests demonstrate that synthesized AM-III carbon is the hardest and strongest AM material known to date, and can scratch diamond crystal and approach its strength. The produced AM carbon materials combine outstanding mechanical and electronic properties, and may potentially be used in photovoltaic applications that require ultrahigh strength and wear resistance.  相似文献   

Body composition and nutritional profile of male adolescent tennis players     

Juzwiak CR  Amancio OM  Vitalle MS  Pinheiro MM  Szejnfeld VL 《Journal of sports sciences》2008,26(11):1209-1217

In this cross-sectional study, we evaluated the body composition and dietary intake of 44 adolescent tennis players. After being divided into two groups (age 10-13 years and age 14-18), the players had their weight, height, and sexual maturation assessed. Dual-energy X-ray absorptiometry was used to assess body composition. Food intake was obtained from a non-consecutive 4-day food record. The data were analysed using the Virtual Nutri v.1.0 software and compared with the present recommendations for adolescent athletes or dietary reference intakes. Body mass index and body fat for tennis practice were adequate for 89% and 71% of the tennis players respectively, regardless of age group. A calorie deficit greater than 10% of energy expenditure was observed in 32% of the sample. Fifty percent of the athletes consumed carbohydrates in accordance with recommended values. Protein and lipid intakes were above recommended values, while fibre, calcium, potassium, magnesium, and folic acid intakes were below recommendation for 98%, 80%, 100%, 100%, and 98% of the tennis players respectively. The observed nutritional deficiencies represent an additional barrier for adolescents engaged in competitive sports to achieve an optimum nutrition to maintain growth, health, and performance.  相似文献   

GIS of landmarks management     

Dimitris Kaimaris  Stella Sylaiou  Olga Georgoula  Petros Patias 《Journal of Cultural Heritage》2011,12(1):65-73

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Perceived service quality factors in online higher education     

La Rotta  Daniel  Usuga  Olga Cecilia  Clavijo  Valentina 《Learning Environments Research》2020,23(2):251-267

Learning Environments Research - In recent years, the offer of higher-education programs under online modality has grown significantly. This situation has generated the need to evaluate the quality...  相似文献   

The internationalization of the U.S. academy in comparative perspective: a descriptive study     

William K. Cummings  Olga Bain 《Asia Pacific Education Review》2009,10(1):107-115

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Dialogue in religious education lessons – possibilities and hindrances in the Estonian context     

Olga Schihalejev 《British Journal of Religious Education》2009,31(3):277-288

This paper discusses the limitations and potentials for dialogue in religious education (RE) classes on the basis of observations of Estonian RE lessons. I investigated how the way of asking questions contributes to the dialogue in the classroom. Additionally I investigated how students’ readiness to engage in dialogue is influenced by others’ responses to their contributions. I examined what happens in a classroom, by observing and analysing patterns of interaction in RE lessons in two schools. Video‐ethnographic data collection was combined with stimulated recall. Incident‐analysis stemming from conversational analysis was used to interpret the data. On the basis of these analyses and interpretations, we can conclude that the teacher‐centred habit of instruction is a main impediment to dialogue. A teacher’s positive reinforcement of answers does not contribute to dialogue between students but rather to the assumption that the correct answer has already been given and to reliance on the teacher’s arguments. Also, open questions do not work always as facilitators of dialogue, but rather can be felt as intimidating.  相似文献