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1.
Ziyu Yang Huihui Zhang Junjie Xu Renzhi Ma Takayoshi Sasaki Yu-Jia Zeng Shuangchen Ruan Yanglong Hou 《国家科学评论(英文版)》2020,7(5):841
Rutile-type fluorides have been proven to be active components in the context of emerging antiferr-omagnetic devices. However, controlled synthesis of low-dimensional, in particular two-dimensional (2D), fluorides in a predictable and deterministic manner remains unrealized because of a lack of efficient anisotropic control, which impedes their further development in reduced dimensions. We report here that altered passivation of {110} growing facets can direct the synthesis of rutile-type fluoride nanocrystals into well-defined zero-dimensional (0D) particulates, one-dimensional (1D) rods and 2D sheets in a colloidal approach. The obtained nanocrystals show positive exchange bias and enhanced magnetic transition temperature from the coexistence of long-range antiferromagnetic order and disordered surface spins, making them strong alternatives for flexible magnetic devices and sensors. 相似文献
2.
ABSTRACTAnterior cruciate ligament (ACL) injuries in badminton commonly occur during single-leg landing after an overhead stroke in the backhand-side court. This study compared differences in trunk acceleration and kinematic variables during single-leg landing in the forehand- and backhand-side courts after an overhead stroke. Eighteen female junior badminton players performed two singles games while wearing a tri-axial accelerometer. The moment that over 4g of resultant acceleration was generated was determined using synchronised video cameras. Trunk lateral inclination and hip abduction angles at the point of landing with over 4g of resultant acceleration were analysed. Mediolateral acceleration in the backhand-side court was greater than that in the opposite-side court (p < 0.001, ES = 0.840). Both trunk lateral angles were larger than those previously reported in injured participants and the hip abduction angle in the backhand-side court was larger than that in the forehand-side court (p < 0.001, ES = 2.357). The lateral and vertical acceleration in the backhand-side court showed moderate-to-strong correlations with the trunk and hip angles. The mediolateral physical demand and high-risk posture in the backhand-side court may be associated with a higher incidence of knee injuries during badminton games. 相似文献
3.
Masahiro Kawabata Kenta Goto Ken Sasaki Eiji Hihara Takahiro Mizushina 《Journal of sports sciences》2013,31(16):1841-1853
AbstractThe purpose of the present study was to relate 3D acceleration patterns of the lower and upper trunk during running to running gait cycle, assess the validity of stride duration estimated from acceleration patterns, investigate speed-dependent changes in acceleration, and examine the test–retest reliability of these parameters. Thirteen healthy young men performed two running trials each on a treadmill and on land at three speeds (slow, preferred, and fast). The 3D accelerations were measured at the L3 spinous process (lower trunk) and the ensiform process (upper trunk) and synchronised with digital video data. The amplitude and root mean square of acceleration and stride duration were calculated and then analysed by three-way analysis of variance to test effects of running conditions, device location, and running speed. Bland-Altman analysis was used to evaluate the test–retest reliability. Marked changes in acceleration were observed in relation to foot strike during running. Stride durations calculated from the vertical accelerations were nearly equal to those estimated from video data. There were significant speed effects on all parameters, and the low test–retest reliability was confirmed in the anterior–posterior acceleration during treadmill running and the anterior–posterior acceleration at slow speed during treadmill and overground running. 相似文献
4.
Robert Strom Shirley Strom Pat Collinsworth Saburo Sato Katsuko Makino Yasuyuki Sasaki 《Educational gerontology》2013,39(8):781-794
The purpose of this study was to determine how three generations view the contribution and needs of grandparents in Japan. A sample consisting of 239 grandparents, 266 parents, and 274 grandchildren from, urban and rural areas completed the Grandparent Strengths and Needs Inventory (Strom & Strom, 1993). Grandparents reported more satisfaction, success, and involvement in teaching than was observed by parents or grandchildren. Grandparents experienced greater difficulty as well as frustration and saw themselves as less informed about their role than was reported by younger people. Significant main effects were generation, grandchild gender, grandchild age, generations living together, frequency of grandchild care by the grandparent, and amount of time the generations spent together. Implications for building curricula and guidelines for program development are identified. 相似文献
5.
Yasuharu Nagano Shogo Sasaki Ayako Higashihara Hiroshi Ichikawa 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(3):342-352
AbstractThis study aimed to elucidate the movements requiring greater trunk accelerations and its frequencies during badminton games, and compare the acceleration components among such movements. Trunk acceleration was measured using a triaxial accelerometer during badminton games. The moments that generated >4 G resultant acceleration were extracted, and movements consistent with the extracted moments were identified. We calculated the extracted movement ratio and frequency and compared the resultant, mediolateral, vertical and anteroposterior accelerations between the top five extracted movements. There were 1,342 movements that generated >4 G [mean, 7.72 (95% confidence interval, 7.31–8.14) cases/min]. The top five movements were lunging during underhand strokes with the dominant hand side leg, landing after overhand strokes on the dominant and non-dominant hand side leg, and cutting from a split step using the dominant and non-dominant hand side leg. Landing on the dominant hand side leg had a greater resultant acceleration than the other movements and had the greatest impact during the badminton game. Lunging during underhand strokes on the dominant hand side leg had greater mediolateral acceleration than the other movements. These results reflected the properties of badminton. 相似文献
6.
Charles Haynes Ed.D. Pamela Hook Ph.D. Paul Macaruso Ph.D. Etsuko Muta M.Ed. Yoichi Hayashi M.A. Junko Kato M.D. Tokuko Sasaki M.Ed. 《Annals of dyslexia》2000,50(1):213-238
This study compared U.S. and Japanese grade school teachers’ perceptions of the strengths and weaknesses of children in their
classrooms identified as fitting commonly used criteria for a learning disability. U.S. teachers identified 4.0 percent of
their children as meeting the criteria and Japanese teachers identified 1.5 percent. The teachers then rated these children’s
abilities in the areas of listening, speaking, reading/writing, reasoning, mathematics, social, and study skills. Overall,
U.S. and Japanese teachers’ rating patterns were similar on 70 percent of the skills. In most areas where significant differences
were found—listening, speaking, reading/writing and study skills—U.S. teachers rated higher percentages of their children
as “weaker” than Japanese teachers. A noteworthy exception was the area of social skills where Japanese children received
higher percentages of “weak” ratings. U.S. and Japanese teachers also differed in their perceptions of causative factors leading
to their children’s learning difficulties. We discuss the findings in terms of U.S.-Japanese differences in writing systems
and cultural expectations. 相似文献
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8.
Jeffer Eidi Sasaki Jairo Hélio Júnior Joilson Meneguci Sheilla Tribess Moacir Marocolo Júnior Antonio Stabelini Neto 《Journal of sports sciences》2018,36(14):1572-1577
The purpose of the study was to examine the minimum number of monitoring days for reliably estimating physical activity (PA) and sedentary behaviour (SB) from accelerometer data in older adults. Forty-two older adults from a local senior centre participated in this study. Participants wore an ActiGraph wGT3X-BT on the right hip for 7 consecutive days. Accelerometer data were downloaded to a computer and converted to activity count data in 60s epochs. Time spent in SB and different PA intensity categories were estimated with commonly used activity count cut-points. Participants with at least 7 valid days of monitoring (≥10 h.day?1) were included in the analysis. Intraclass correlation coefficients (ICC) were calculated for determining single-day monitoring reliability. The Spearman-Brown prophecy formula was used to estimate the minimum number of monitoring days required for achieving an ICC of 0.80. Single-day ICC values for time spent in SB and PA intensity categories ranged from 0.45 to 0.61. Minimum number of monitoring days required for achieving an ICC of 0.80 ranged from 2.5 to 4.9 days. In this study, a minimum of 5 consecutive days of monitoring was required for reliably estimating SB and PA from accelerometer data in older adults. 相似文献
9.
This study examines the validity of the Marshall Sitting Questionnaire (MSQ) in people with multiple sclerosis (MS) and presents a prediction model to improve the accuracy of the MSQ estimates. Participants (n = 63 [15M and 48F], age: 56.6 ± 7.3 years) wore an accelerometer on the hip for a 7-day period and completed the MSQ. Sedentary behaviour (SB) estimates were computed as min/day for both the MSQ and accelerometer. Associations between the two methods were examined using the Pearson correlation and agreement was assessed using a Bland-Altman plot. A linear prediction model was developed to improve the accuracy of the MSQ estimates using a selection of predictor variables routinely collected in MS research. There was a moderate correlation between MSQ and accelerometer SB estimates (r = 0.34, p < 0.01). The Bland-Altman plot indicated that the MSQ overestimated SB (mean bias: 80.54 min/day, 95% limits of agreement: ?410.5 to 571.5 min/day). The prediction model improved the MSQ estimates by 39% and virtually eliminated measurement bias (mean bias:-0.21 min/day; 95% limits of agreement:-109.8 to 109.4 min/day). The results indicate preliminary evidence for the validity of the MSQ in people with MS, and support the application of an alternative prediction model to improve the accuracy of the MSQ estimates.
Abbreviations: SB = sedentary behaviour; MS = multiple sclerosis; MSQ = Marshall Sitting Questionnaire; PA = physical activity; EDSS = Expanded Disability Status Scale; LPA = light physical activity; MVPA = moderate-to-vigorous physical activity; GLTEQ = Godin Leisure Time Exercise Questionnaire; PDDS = Patient-Determined Disease Steps; RMSE = root mean square error. 相似文献
10.
对三元能量的特性进行了论述,并结合科学实验提出一些测试的方法。认为研究三元应将传统文化对世界整体性的感悟和现代科学对物质的再现性、客观性、普遍性测试相结合。 相似文献