期刊文献+
共找到26,210篇文章
< 1 2 250 >
每页显示 20 50 100
青藏高原泥石流的形成及运动过程研究 预览
1
作者 王彬 张全贵 《广西水利水电》 2019年第1期1-4,26共5页
传统的泥石流模拟模型对青藏高原泥石流的模拟与实际情况的吻合度较低,无法为预防与治理泥石流提供合理的数据。为此,构建泥石流形成运动模拟模型对青藏高原泥石流形成及运动过程进行模拟研究。根据质量守恒原则、侵蚀、降雨与摩擦影响... 传统的泥石流模拟模型对青藏高原泥石流的模拟与实际情况的吻合度较低,无法为预防与治理泥石流提供合理的数据。为此,构建泥石流形成运动模拟模型对青藏高原泥石流形成及运动过程进行模拟研究。根据质量守恒原则、侵蚀、降雨与摩擦影响因素,建立泥石流形成、运动模拟模型,采用有限差分数值方法对泥石流厚度与流速进行计算。通过对泥石流厚度与流速的计算,实现了对青藏高原泥石流形成、运动过程的模拟。通过实验对比结果可知,泥石流形成及运动模拟模型与实际情况的吻合度远远高于传统模拟模型,说明泥石流形成运动模拟模型具备较高的有效性。 展开更多
关键词 泥石流 形成 运动 过程 模拟 流速 青藏高原
在线阅读 下载PDF
March 2019 Released by Cotton Incorporated 预览
2
《中国纺织:英文版》 2019年第4期62-63,共2页
Recent price movement Benchmark prices were flat or slightly higherover the pastmonth. Prices for the May NY futures contract increased over past month,climbing from levels just below 70 cents/lb in mid-February to th... Recent price movement Benchmark prices were flat or slightly higherover the pastmonth. Prices for the May NY futures contract increased over past month,climbing from levels just below 70 cents/lb in mid-February to those near 74 cents/lb recently. 展开更多
关键词 COTTON Incorporated Recent PRICE movement BENCHMARK PRICES
在线阅读 下载PDF
Skill Learning for Human-Robot Interaction Using Wearable Device
3
作者 Bin Fang Xiang Wei +3 位作者 Fuchun Sun Haiming Huang Yuanlong Yu Huaping Liu 《清华大学学报自然科学版(英文版)》 EI CAS CSCD 2019年第6期654-662,共9页
With the accelerated aging of the global population and escalating labor costs, more service robots are needed to help people perform complex tasks. As such, human-robot interaction is a particularly important researc... With the accelerated aging of the global population and escalating labor costs, more service robots are needed to help people perform complex tasks. As such, human-robot interaction is a particularly important research topic. To effectively transfer human behavior skills to a robot, in this study, we conveyed skill-learning functions via our proposed wearable device. The robotic teleoperation system utilizes interactive demonstration via the wearable device by directly controlling the speed of the motors. We present a rotation-invariant dynamicalmovement-primitive method for learning interaction skills. We also conducted robotic teleoperation demonstrations and designed imitation learning experiments. The experimental human-robot interaction results confirm the effectiveness of the proposed method. 展开更多
关键词 SKILL learning interaction TELEOPERATION DYNAMICAL MOVEMENT PRIMITIVE
Research on valve core’s clamping stagnation of double flapper-nozzle servo valve 预览
4
作者 赵建华 Zhang Bin +3 位作者 Chen Tao Wang Qiang Zhou Songlin Gao Dianrong 《高技术通讯:英文版》 CAS 2019年第1期65-73,共9页
Due to great changing of instantaneous temperature of hydraulic oil of double flapper-nozzle servo valve, thermal deformation between valve core and valve sleeve may result in catching phenomenon of valve core, and th... Due to great changing of instantaneous temperature of hydraulic oil of double flapper-nozzle servo valve, thermal deformation between valve core and valve sleeve may result in catching phenomenon of valve core, and then the reliability of servo valve could be affected seriously. The work focuses on a particular model of double flapper-nozzle servo valve and establishes three dimension couple models of liquid-solid-thermal under extreme operating condition. The transmission route and dissipative mechanism of heat is revealed and thermal deformation behavior of valve core and valve sleeve is researched. A change law of the key fit clearance under the effect of thermal expansion and warp deformation is explored, the source of catching phenomenon of valve core is identified, and then preventive measure and improvement can be proposed. In order to verify the correctness of theoretical analysis, the moving smoothness of deformed valve core and reground valve core under the circumstance of high-temperature hydraulic oil on electrohydraulic servo valve static characteristics test table is compared and tested. The results show that as oil temperature rises, relative deformations between valve core and valve sleeve in different direction at a same cross-section are not equal, and then the key fit clearance is less than the initial value. Relative deformations in the same direction at different axial position are not equal, the deformations of middle and two ends are maximum and minimum values respectively, and then warp deformation of valve core occurs. When oil temperature is higher, the relative deformations between valve core and valve sleeve is larger, the moving smoothness of valve core gets worse, and the catching phenomenon of valve core occurs. Axial deformation of valve sleeve and valve core at different axial position is different, and the opening coefficient and stability of servo valve could be affected, especially the operation circumstance of small opening. The study can provide some guidance for designing do 展开更多
关键词 DOUBLE flapper-nozzle servo valve flow-solid-thermal coupling numerical simulation CATCHING phenomenon THERMAL deformation mechanism smooth movement
在线阅读 下载PDF
日常无监督状态下的脉率变异性提取方法研究
5
作者 漆宇晟 张爱华 马玉润 《生物医学工程学杂志》 EI CAS CSCD 北大核心 2019年第2期298-305,共8页
日常生活中脉率变异性(PRV)的提取常常受到运动、血流灌注的影响,因此本文提出了在耳后进行脉搏信号检测并提取PRV的方法,以提高日常PRV提取的准确性和稳定性。本文首先研制适合日常使用的耳后脉搏采集系统,其可通过蓝牙将数据传输至安... 日常生活中脉率变异性(PRV)的提取常常受到运动、血流灌注的影响,因此本文提出了在耳后进行脉搏信号检测并提取PRV的方法,以提高日常PRV提取的准确性和稳定性。本文首先研制适合日常使用的耳后脉搏采集系统,其可通过蓝牙将数据传输至安卓手机进行日常PRV提取。然后,根据日常生活状态分别设计了静止、运动、咀嚼、说话状态下的9项试验,并同步采集单导联的心电信号和指部脉搏信号与耳后脉搏信号进行对比分析。根据信号波形、幅值、幅频特性的研究结果表明,耳后脉搏信号比传统采集于指部的脉搏信号稳定,且可保留更多的有效信息;从耳后脉搏信号中提取的PRV具有较高的准确率,9项试验的准确率均高于98.000%。因此,本文设计的耳后提取PRV方法具有准确率高、稳定性好、便于日常使用等特点,可为日常无监督状态下PRV的准确提取提供新的思路和途径。 展开更多
关键词 日常无监督状态 运动 血流灌注 耳后脉搏 脉率变异性
Buddhist Nationalism as Social Movement in Political Transition:MaBaTha Movement in Myanmar 预览
6
作者 ZHANG Lei 《国际关系与外交:英文版》 2019年第2期66-75,共10页
Aggressive Buddhist nationalism has emerged as a considerable societal issue in Myanmar and a threat to peaceful coexistence in this multi-religious and multi-ethnic country since the political transition.The paper ar... Aggressive Buddhist nationalism has emerged as a considerable societal issue in Myanmar and a threat to peaceful coexistence in this multi-religious and multi-ethnic country since the political transition.The paper argues that the integration of strong religious capacity and strong political needs is the main reason for the rapid development of Buddhist nationalism in Myanmar since 2011.To be specific,strong religious capacity provides possibilities,and strong political needs create the necessity for the rapid development of Buddhist nationalism.Taking the MaBaTha movement as an example,the paper concludes the developing trajectory and characteristics of the movement.In terms of strong religious capability of Buddhism,the authority and legitimacy of Buddhism in Myanmar lay the foundation for the emergence and expansion of MaBaTha;on the other hand,powerful social network of Buddhism and the extensive community service provided by Buddhist organizations makes MaBaTha have strong mobilization capabilities.In terms of strong domestic political needs,the economic and social realities during the period of political transition made MaBaTha’s claims be widely accepted in Myanmar,and political elites’mobilization form was the driving force for the organization’s rapid development.Finally,four suggestions are put forward on how to tackle the challenges brought by Buddhist nationalism in Myanmar. 展开更多
关键词 BUDDHIST NATIONALISM Myanmar SOCIAL MOVEMENT MaBaTha
在线阅读 下载PDF
The Scientific Spirit of the Contemporary Semiotic Movement
7
作者 Youzheng Li 《语言与符号学研究》 2019年第1期138-144,共7页
This paper maintains an interdisciplinary/cross-cultural orientation in organizing new 'general semiotics'. In any case the traditional philosophy-centered foundation of general semiotics should be avoided to ... This paper maintains an interdisciplinary/cross-cultural orientation in organizing new 'general semiotics'. In any case the traditional philosophy-centered foundation of general semiotics should be avoided to meet with the genuine spirit of modern semiotic movement. Philosophy is part of theoretical sources of semiotic theorization rather than the basis of the latter. The same thing can be said about other important disciplines such as language, philosophy, cognitive science, general linguistics, etc. The semiotic way of thinking requests a new typology of rationality. 展开更多
关键词 semiotic MOVEMENT PHILOSOPHY INTERDISCIPLINARY theory
分子马达运动:生命滑动的乐章 预览
8
作者 郭晓强 《自然杂志》 2019年第1期56-62,共7页
生命在于运动,因此运动对生命而言具有至关重要的意义。肌球蛋白、动力蛋白和驱动蛋白是三种重要的分子马达,负责肌肉细胞和非肌肉细胞的运动。肌球蛋白与肌动蛋白间滑动构成肌肉收缩的基础;动力蛋白和驱动蛋白沿微管运动在细胞内物质运... 生命在于运动,因此运动对生命而言具有至关重要的意义。肌球蛋白、动力蛋白和驱动蛋白是三种重要的分子马达,负责肌肉细胞和非肌肉细胞的运动。肌球蛋白与肌动蛋白间滑动构成肌肉收缩的基础;动力蛋白和驱动蛋白沿微管运动在细胞内物质运输,有丝分裂、减数分裂中染色体分离过程和细胞骨架动力学方面发挥重要作用。分子马达突变或缺陷可导致遗传性神经病变、严重型肌病和呼吸道慢性感染等发生。因此,分子马达运动的相关研究成果为多种疾病治疗提供新的策略。文章回顾了分子马达的研究历程、生物学作用和应用意义。 展开更多
关键词 分子马达 运动 滑动模型 肌肉收缩 物质运输
在线阅读 下载PDF
Jurassic integrative stratigraphy and timescale of China
9
作者 Diying HUANG 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第1期223-255,共33页
The Jurassic stratigraphy in China is dominated by continental sediments. Marine facies and marine-terrigenous facies sediment have developed locally in the Qinghai-Tibet area, southern South China, and northeast Chin... The Jurassic stratigraphy in China is dominated by continental sediments. Marine facies and marine-terrigenous facies sediment have developed locally in the Qinghai-Tibet area, southern South China, and northeast China. The division of terrestrial Jurassic strata has been argued, and the conclusions of biostratigraphy and isotope chronology have been inconsistent.During the Jurassic period, the North China Plate, South China Plate, and Tarim Plate were spliced and formed the prototype of ancient China. The Yanshan Movement has had a profound influence on the eastern and northern regions of China and has formed an important regional unconformity. The Triassic-Jurassic boundary(201.3 Ma) is located roughly between the Haojiagou Formation and the Badaowan Formation in the Junggar Basin, and between the Xujiahe Formation and the Ziliujing Formation in the Sichuan Basin. The early Early Jurassic sediments generally were lacking in the eastern and central regions north of the ancient Dabie Mountains, suggesting that a clear uplift occurred in the eastern part of China during the Late Triassic period when it formed vast mountains and plateaus. A series of molasse-volcanic rock-coal strata developed in the northern margin of North China Craton in the Early Jurassic and are found in the Xingshikou Formation, Nandailing Formation, and Yaopo Formation in the West Beijing Basin. The geological age and markers of the boundary between the Yongfeng Stage and Liuhuanggou Stage are unclear. About 170 Ma ago, the Yanshan Movement began to affect China. The structural system of China changed from the near east-west Tethys or the Ancient Asia Ocean tectonic domain to the north-north-east Pacific tectonic domain since 170–135 Ma. A set of syngenetic conglomerate at the bottom of the Haifanggou or Longmen Fms. represented another set of molasse-volcanic rock-coal strata formed in the Yanliao region during the Middle Jurassic Yanshan Movement(Curtain A1). The bottom of the conglomerate is approximately equivalent to the boundary of t 展开更多
关键词 Continental JURASSIC BIOSTRATIGRAPHY Isotope CHRONOLOGY Age frame Yanshan Movement Yanliao BIOTA
Gu Jiegang’s “Discussion of Ancient History” Movement and It Relationship with Developments in Western Sinology 预览
10
作者 Li Changyin Ge Hongquan(译) 《当代社会科学(英文)》 2019年第1期134-155,共22页
The scholarship in modern China is closely related to Western sinology in terms of school ties.Gu Jiegang’s launching of the'Discussion of Ancient History'movement centered on the'theory of the accumulate... The scholarship in modern China is closely related to Western sinology in terms of school ties.Gu Jiegang’s launching of the'Discussion of Ancient History'movement centered on the'theory of the accumulated creation of Chinese ancient history'was a representative example.At the beginning of the movement Hu Shi and Gu Jiegang proposed the notion that,'there was no history before the Eastern Zhou Dynasty'which was indebted to the historical skepticism by Philip Van Ness Myers(American scholar)and Friedrich Hirth(German sinologist)of the same period.The idea that'the Shang Dynasty is still in the late Stone Age'advocated by Hu and Gu was also directly influenced by J.G.Andersson’s An Early Chinese Culture.Conversely,American sinologist Arthur W.Hummel Sr played a key role in introducing and evaluating the first volume of Discussion of Ancient History to Western academia.Paradoxically,while Swedish sinologis Bernhard Karlgren wrote On the Authenticity and Nature of the Tso Chuan to refute Kang Youwei’s reinterpretation of Confucian Classics(The Forged Classics of the Wang Mang Period),his work however became of value for Chinese historic doubt scholars to reaffirm the value of New Text Confucianism and advance the'Discussion of Ancient History'movement.If we would like to choose a saying to describe the relationship between the'Discussion of Ancien History'movement and Western Sinology,the Chinese proverb,'Stones from other hills may serve to polish jade of this one,'may be an appropriate choice. 展开更多
关键词 Western SINOLOGY 'Discussion of Ancient History' MOVEMENT HISTORY of ACADEMIC exchanges between China and foreign COUNTRIES
在线阅读 免费下载
Cursor momentum for fascination measurement
11
作者 Yu HONG Kai WANG +2 位作者 Weiyi GE Yingying QIU Guodong ZHOU 《中国计算机科学前沿:英文版》 SCIE EI CSCD 2019年第2期396-412,共17页
We present a very different cause of search engine user behaviors ——fascination. It is generally identified as the initial effect of a product attribute on users' interest and purchase intentions. Considering th... We present a very different cause of search engine user behaviors ——fascination. It is generally identified as the initial effect of a product attribute on users' interest and purchase intentions. Considering the fact that in most cases the cursor is driven directly by a hand to move via a mouse (or touchpad), we use the cursor movement as the critical feature to analyze the personal reaction against the fascinating search results. This paper provides a deep insight into the goal-directed cursor movement that occurs within a remarkably short period of time (<30 milliseconds), which is the interval between a user's click-through and decision-making behaviors. Instead of the fundamentals, we focus on revealing the characteristics of the split-second cursor movement. Our empirical findings showed that a user may push or pull the mouse with a slightly greater strength when fascinated by a search result. As a result, the cursor slides toward the search result with an increased momentum. We model the momentum through a combination of translational and angular kinetic energy calculations. Based on Fitts' law, we implement goal-directed cursor movement identification. Supported by the momentum, together with other physical features, we built different fascination-based search result reranking systems. Our experiments showed that goal-directed cursor momentum is an effective feature in detecting fascination. In particular, they show feasibility in both the personalized and cross-media cases. In addition, we detail the advantages and disadvantages of both click-through rate and cursor momentum for re-ranking search results. 展开更多
关键词 fascination MEASUREMENT USER-ORIENTED SEARCH user behavior goal-directed CURSOR movement SEARCH result RE-RANKING
肿瘤膝关节置换术后患者下楼时的生物力学特征及临床意义 预览
12
作者 王航辉 宋依芯 +5 位作者 张敏利 任玉炳 刘西纺 朱正飞 朱文侠 韩为华 《现代肿瘤医学》 CAS 2019年第3期472-476,共5页
目的:旨在通过研究肿瘤膝关节置换术后患者下楼时的生物力学特征,为患者提供下楼时安全、有效的靶向康复指导。方法:采集研究对象下楼时的三维步态数据。通过下肢运动学与动力学功能参数来综合评估其下楼梯时双下肢的生物力学特征。结果... 目的:旨在通过研究肿瘤膝关节置换术后患者下楼时的生物力学特征,为患者提供下楼时安全、有效的靶向康复指导。方法:采集研究对象下楼时的三维步态数据。通过下肢运动学与动力学功能参数来综合评估其下楼梯时双下肢的生物力学特征。结果:肿瘤膝关节置换术后(实验组)下楼时健侧髋与膝关节屈伸角度峰值均大于患侧,实验组健侧、患侧下肢髋关节内收外展角度活动范围分别为-12°~7°、-5°~17°;膝骨性关节炎(kneeoste oarthritis,KOA)组健侧、患侧髋关节屈伸角度范围分别为14°~30°、17°~82°;KOA组健侧、患侧膝关节屈伸角度范围分别为4°~59°、3°~102°,KOA患者健侧、患侧髋关节内收外展角度范围分别为-2°~27°、-9°~38°。对照组关节力曲线出现两个波峰。实验组患者健侧关节力波峰出现在60%步态周期时刻,患侧关节力有两个波峰;KOA组患者健侧下肢关节力较小,患侧下肢关节力个体差异较大。结论:实验组术后下楼梯时以健侧补偿为主,术后良好的镇痛与超早期肌肉力量训练、神经肌肉适应性训练、户外运动、辅助个性化矫形器和手扶栏杆、改变步态等方式能提高下楼时的安全性,提升靶向康复质量。 展开更多
关键词 肿瘤膝关节置换术 下楼 生物力学 运动 靶向康复
在线阅读 下载PDF
Long-term follow-up of a patient with venlafaxine-induced diurnal bruxism treated with an occlusal splint: A case report 预览
13
作者 Jia-Min Chen Ying Yan 《世界临床病例杂志》 2019年第4期516-524,共9页
BACKGROUND Bruxism is a jaw-muscle activity characterized by the clenching or grinding of teeth. It can be divided into nocturnal bruxism and diurnal bruxism (DB). DB secondary to antidepressants is rare and refractor... BACKGROUND Bruxism is a jaw-muscle activity characterized by the clenching or grinding of teeth. It can be divided into nocturnal bruxism and diurnal bruxism (DB). DB secondary to antidepressants is rare and refractory. Reports associated with antidepressant-induced DB are mostly anecdotal without long-term follow-up. The effect of drug intervention on antidepressant-induced DB is still contested. We herein report the first case of successful treatment of venlafaxine-induced DB with an occlusal splint. CASE SUMMARY This case report describes detailed 7-year follow-up of a patient with venlafaxineinduced DB treated with an occlusal splint. The patient who complained about involuntary daytime tooth grinding after taking venlafaxine for a period of 4 mo and was diagnosed with venlafaxine-induced DB. Subsequently, an occlusal splint with modified bilateral buccal-pterygoid pads was used to treat his tooth grinding and to protect the dental structures from tooth wearing. The patient reported remission of symptoms after several months of treatment. His grinding activity was gradually and stably controlled after 2 years, with an almost complete recovery from DB after 6 years. CONCLUSION The maxillary buccal-pterygoid splint can be used as a noninvasive approach to treat venlafaxine-induced DB. 展开更多
关键词 Occlusal SPLINT VENLAFAXINE DIURNAL BRUXISM TOOTH grinding Movement DISORDERS Treatment Case report
在线阅读 免费下载
建造的诗与谜—西格尔德·莱弗伦兹的建筑作品与思想解析
14
作者 姚远 黄里达 张彤 《建筑学报》 CSSCI 北大核心 2019年第4期97-105,共9页
莱弗伦兹的作品凝炼了北欧现代建筑整体层面的斯堪的纳维亚性,同时呈现出多义、复杂、细致、隐秘的个人特质。从神启的自然、诗意的建造、人性的润泽3个方面阐述斯堪的纳维亚性在其作品中的表呈,然后围绕“间奏、环绕、运动和隐喻”4个... 莱弗伦兹的作品凝炼了北欧现代建筑整体层面的斯堪的纳维亚性,同时呈现出多义、复杂、细致、隐秘的个人特质。从神启的自然、诗意的建造、人性的润泽3个方面阐述斯堪的纳维亚性在其作品中的表呈,然后围绕“间奏、环绕、运动和隐喻”4个关键词剖析其中多元主题的诗意叙事和隐喻的建构表达。 展开更多
关键词 西格尔德·莱弗伦兹 斯堪的纳维亚性 间奏 环绕 运动 隐喻
Early constraint-induced movement therapy affects behavior and neuronal plasticity in ischemia-injured rat brains 预览
15
作者 Xi-Hua Liu Hong-Yan Bi +2 位作者 Jie Cao Shuo Ren Shou-Wei Yue 《中国神经再生研究:英文版》 SCIE CAS CSCD 2019年第5期775-782,共8页
Constraint-induced movement therapy is an effective rehabilitative training technique used to improve the restoration of impaired upper extremity movement after stroke.However,whether constraint-induced movement thera... Constraint-induced movement therapy is an effective rehabilitative training technique used to improve the restoration of impaired upper extremity movement after stroke.However,whether constraint-induced movement therapy is more effective than conventional rehabilitation in acute or sub-acute stroke remains controversial.The aim of the present study was to identify the optimal time to start constraint-induced movement therapy after ischemic stroke and to explore the mechanisms by which constraint-induced movement therapy leads to post-stroke recovery.Sixty-four adult male Sprague-Dawley rats were randomly divided into four groups:sham-surgery group,cerebral ischemia/reperfusion group,early constraint-induced movement therapy group,and late constraint-induced movement therapy group.Rat models of left middle cerebral artery occlusion were established according to the Zea Longa line embolism method.Constraint-induced movement therapy was conducted starting on day 1 or day 14 in the early constraint-induced movement therapy and late constraint-induced movement therapy groups,respectively.To explore the effect of each intervention time on neuromotor function,behavioral function was assessed using a balance beam walking test before surgery and at 8 and 21 days after surgery.The expression levels of brain-derived neurotrophic factor,nerve growth factor and Nogo receptor were evaluated using real time-polymerase chain reaction and western blot assay to assess the effect of each intervention time.The results showed that the behavioral score was significantly lower in the early constraint-induced movement therapy group than in the cerebral ischemia/reperfusion and late constraint-induced movement therapy groups at 8 days.At 21 days,the scores had significantly decreased in the early constraint-induced movement therapy and late constraint-induced movement therapy groups.At 8 days,only mild pyknosis appeared in neurons of the ischemic penumbra in the early constraint-induced movement therapy group,which was distinctly better 展开更多
关键词 NERVE REGENERATION ischemic stroke rehabilitation constraint-induced movement therapy NERVE growth factors functional recovery NEURONAL PLASTICITY real time-polymerase chain reaction western blot assay rats neural REGENERATION
在线阅读 下载PDF
Social-ecological correlates of fundamental movement skills in young children
16
作者 Nan Zeng Susan L. Johnson +1 位作者 Richard E. Boles Laura L. Bellows 《运动与健康科学:英文版》 SCIE 2019年第2期122-129,共8页
Purpose: To identify the social-ecological correlates associated with fundamental movement skills at the child, family, and environment levels in young children.Methods: Preschool children from 4 Colorado Head Start/p... Purpose: To identify the social-ecological correlates associated with fundamental movement skills at the child, family, and environment levels in young children.Methods: Preschool children from 4 Colorado Head Start/preschool centers were recruited from 2010 to 2012. Two hundred twenty-eight children(128 girls;age = 56.08 ± 4.09 months;body mass index(BMI) z-score = 0.53 ± 1.12(mean ± SD);42.1% Hispanic/Latino) and 159 families were included in the final analysis. Children’s perceived competence and fundamental movement skills were assessed via the Pictorial Scale of Perceived Competence and Social Acceptance and the Bruininks-Oseretsky Test of Motor Proficiency, 2 nd edition. Data on the number of children in the family, parent age, BMI, education, employment status, family income, perception of child coordination, and home physical activity environment were collected via a questionnaire. Linear regressions adjusted for child BMI, age, sex, and school site were performed at each level.Results: Child perceived cognitive competence was positively associated with locomotor skills(p = 0.04;adjusted R2= 0.035) and object-control skills(p = 0.003;adjusted R^2= 0.083) at the child level. Parent education, BMI, and perception of child coordination were positively associated with locomotor skills and explained 8.8% of variance, but only parent education was significant(p = 0.04) at the family level. In addition, physical environment was positively associated with locomotor skills(p = 0.02) and explained 5.5% of variance at the environment level.Conclusion: Social-ecological correlates associated with young children’s fundamental movement skills are multidimensional and differ according to skill category at the child, family, and environment levels. 展开更多
关键词 Activity environment FUNDAMENTAL MOVEMENT SKILLS Parent education PERCEIVED cognitive competence PRESCHOOL children
基于跨理论模型的运动指导对血液透析患者生活质量的影响 预览
17
作者 黄莉娟 段培蓓 +1 位作者 张静 朱亚梅 《中国血液净化》 CSCD 2019年第3期181-184,共4页
目的探讨应用跨理论模型指导维持性血液透析患者规律运动对其生活质量的影响。方法数字随机法将入选的62例长期血液透析患者分为试验组和对照组。对照组予以常规运动健康指导,试验组以跨理论模型为基础的健康指导,记录0、6个月后2组患... 目的探讨应用跨理论模型指导维持性血液透析患者规律运动对其生活质量的影响。方法数字随机法将入选的62例长期血液透析患者分为试验组和对照组。对照组予以常规运动健康指导,试验组以跨理论模型为基础的健康指导,记录0、6个月后2组患者的规律运动、体能、血红蛋白、血清白蛋白等指标以及健康状况调查量表SF-36的分数。结果以跨理论模型为指导,2组患者在规律运动方面,指导前无统计学差异(t=0.069,P=0.793),指导后存在统计学差异(t=5.391,P=0.002);正常步速、最大步速提高有统计学意义(t=2.021,2.870;P=0.046,0.006);血红蛋白、血清白蛋白的改善有统计学意义(t=3.741,4.587;P=0.024,0.018);生活质量调查表(SF-36)中总体健康、精神健康、情感职能、社会功能、活力、躯体疼痛、生理功能、生理职能分数较对照组差异有统计学差异(t值分别为3.698,4.325,10.362,2.946,3.498,4.264,3.026,4.125,P值分别为0.025,0.019,<0.001,0.045,0.027,0.012,0.031,0.015)。结论基于跨理论模型的健康指导可以提高MHD患者的生活质量,值得在临床推广。 展开更多
关键词 血液透析 运动 跨理论模型 生活质量
在线阅读 下载PDF
55000t散货船在风浪联合作用下的系泊试验研究 预览
18
作者 马隽 耿宝磊 +2 位作者 李伟迁 李焱 高峰 《中国港湾建设》 2019年第2期26-31,共6页
通过几何比尺1∶50的物理模型试验,对55 000 DWT散货船在风、浪不同组合条件下船舶系泊的运动量、系缆力以及船舶靠泊产生的撞击力和撞击能量进行了研究。分析表明系缆方式二艉横缆的缆绳长度比系缆方式一增加2.0~3.8倍时,使得横缆受力... 通过几何比尺1∶50的物理模型试验,对55 000 DWT散货船在风、浪不同组合条件下船舶系泊的运动量、系缆力以及船舶靠泊产生的撞击力和撞击能量进行了研究。分析表明系缆方式二艉横缆的缆绳长度比系缆方式一增加2.0~3.8倍时,使得横缆受力有所减小,艏、艉缆和艏、艉横缆绳受力更为均匀;在推荐的系缆方式二中,港内波浪周期在12 s时,从受力角度来看,限制波浪工况为H4%≤0.5 m;从运动量角度来看,限制波浪工况为H4%≤0.6 m。文章在上述分析的基础上,推荐了合理的系缆方式,为工程设计提供了参考。 展开更多
关键词 散货船 风浪联合 撞击力 系缆力 运动量
在线阅读 下载PDF
Locomotion Stability Analysis of Lower Extremity Augmentation Device
19
作者 Likun Wang Chaofeng Chen +3 位作者 Wei Dong Zhijiang Du Yi Shen Guangyu Zhao 《仿生工程学报:英文版》 SCIE EI CSCD 2019年第1期99-114,共16页
Stability is of great significance in the theoretical framework of biped locomotion.Real-time control and walking patterns planning are on the premise that the robot works in the stable condition.In this paper,we addr... Stability is of great significance in the theoretical framework of biped locomotion.Real-time control and walking patterns planning are on the premise that the robot works in the stable condition.In this paper,we address the crucial issue of the locomotion stability based on the modified Poincare return map and the hybrid automata.Not akin to the traditional stability criteria,i.e.,the Zero Moment Point(ZMP)and the Center of Mass(CoM),the modified Poincare return map is more appropriate for both dynamic walking arid non-periodic walking.Moreover,a novel high-level reinforcement learning methodology,so-called active PI2 CMA-ES,is proposed in this paper to plan the exoskeleton locomotion.The proposed learning methodology demonstrates that the locomotion of the exoskeleton is asymptotically stable according to the modified Poincare return map criterion.Finally,the proposed learning methodology is tested by the Lower Extremity Augmentation Device(LEAD)and its effectiveness is verified by the experiments. 展开更多
关键词 BIPED locomotion DYNAMIC WALKING DYNAMIC Movement Primitives (DMP) stability EXOSKELETON bioinspiration
运动与结直肠癌关系研究进展 预览
20
作者 万嫣(综述) 苏羚子(审校) 李柏(审校) 《临床与病理杂志》 2019年第5期1117-1122,共6页
结直肠癌是人类常见的消化道恶性肿瘤之一,居常见恶性肿瘤发病率的第3位。近二三十年亚洲地区的结直肠癌发病率稳步上升,男性尤为明显。长时间大样本的临床调查研究发现运动可以降低26种癌症的发病风险,其中结直肠癌的发病风险降低16%。
关键词 结直肠癌 运动 自噬
在线阅读 下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈