排序方式: 共有125条查询结果,搜索用时 15 毫秒
61.
赵晓华 《医学与哲学(人文社会医学版)》2009,30(3):36-38
为探讨骨髓增生异常综合征患者与再生障碍性贫血患者骨髓髓系细胞的免疫表型变化,用流式细胞术检测骨髓增生异常综合征、再生障碍性贫血及正常对照髓系细胞的表面抗原。结果显示骨髓增生异常综合征组髓系细胞较正常对照组及再生障碍性贫血组表面抗原表达明显不同。因此,流式细胞术有助于二者的诊断及鉴别诊断。 相似文献
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This study examined the psychometric properties of the Dispositional Flow Scale-2 (DFS-2; Jackson and Eklund in Journal of
Sports and Exercise Psychology, 24:133-150, 2002). One thousand five hundred and seventy-eight secondary school students (One thousand and seventy four males, four hundred
and eleven females, ninety-three missing) from six schools in Singapore completed the questionnaires. Confirmatory factor
analysis (CFA) was used to evaluate the factorial structure of the DFS-2. A nine-first-order factor model was compared to
a higher order model with a global flow factor. Support was found for the higher order factor. Multigroup analysis demonstrated
invariance of the factor forms, factor loadings, factor variances, and factor covariances across age and sex. The DFS-2 subscales
were found to have acceptable reliability estimates, and convergent validity. We conclude that DFS-2 is a valid instrument
for assessing global flow experience in Internet gaming. 相似文献
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Andrew B. Newberg Nancy Wintering Mark R. Waldman Daniel Amen Dharma S. Khalsa Abass Alavi 《Consciousness and cognition》2010,19(4):899-905
We have studied a number of long-term meditators in previous studies. The purpose of this study was to determine if there are differences in baseline brain function of experienced meditators compared to non-meditators. All subjects were recruited as part of an ongoing study of different meditation practices. We evaluated 12 advanced meditators and 14 non-meditators with cerebral blood flow (CBF) SPECT imaging at rest. Images were analyzed with both region of interest and statistical parametric mapping. The CBF of long-term meditators was significantly higher (p < .05) compared to non-meditators in the prefrontal cortex, parietal cortex, thalamus, putamen, caudate, and midbrain. There was also a significant difference in the thalamic laterality with long-term meditators having greater asymmetry. The observed changes associated with long-term meditation appear in structures that underlie the attention network and also those that relate to emotion and autonomic function. 相似文献
66.
外伤性视神经病变是一类严重损害视功能的疾病,临床治疗上普遍存在着过度治疗的问题。原因是多样的,治疗标准不统一是主要原因。依据循证医学的成果,对临床外伤性视神经病变现阶段存在的过度医疗进行分析探讨,并提出了医者针对外伤性视神经病变过度医疗应采取的措施,获得最优化的诊疗方案。 相似文献
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We implemented a virtual reality system to quantify differences in the use of visual feedback to maintain balance during walking between healthy young (n = 12, mean age: 24 years) and healthy old (n = 11, 71 years) adults. Subjects walked on a treadmill while watching a speed-matched, virtual hallway with and without mediolateral visual perturbations. A motion capture system tracked center of mass (CoM) motion and foot kinematics. Spectral analysis, detrended fluctuation analysis, and local divergence exponents quantified old and young adults’ dynamic response to visual perturbations. Old and young adults walked normally with comparable CoM spectral characteristics, lateral step placement temporal persistence, and local divergence exponents. Perturbed visual flow induced significantly larger changes in mediolateral CoM motion in old vs. young adults. Moreover, visual perturbations disrupted the control of lateral step placement and compromised local dynamic stability more significantly in old than young adults. Advanced age induces a greater reliance on visual feedback to maintain balance during waking, an effect that may compensate for degradations in somatosensation. Our findings are relevant to the early diagnosis of sensory-induced balance impairments and also point to the potential use of virtual reality to evaluate sensory rehabilitation and balance training programs for old adults. 相似文献
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Jef J.J. van den Hout Orin C. Davis Mathieu C.D.P. Weggeman 《The Journal of psychology》2018,152(6):388-423
Despite the noted potential for team flow to enhance a team's effectiveness, productivity, performance, and capabilities, studies on the construct in the workplace context are scarce. Most research on flow at the group level has been focused on performance in athletics or the arts, and looks at the collective experience. But, the context of work has different parameters, which necessitate a look at individual and team level experiences. In this review, we extend current theories and essay a testable, multilevel model of team flow in the workplace that includes its likely prerequisites, characteristics, and benefits. 相似文献
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实验诊断临床思维程序的必要性及其内容 总被引:1,自引:1,他引:0
温晓艳 《医学与哲学(人文社会医学版)》2011,(1):63-64
为提高临床实验诊断的效率和准确性,提出编写“实验诊断临床思维程序”的观点。从实验诊断学的特性及发展趋势方面论述了该程序的必要性,并初步拟定了包括项目选择、结果判断和结果应用三个部分的实验诊断临床思维程序。 相似文献
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Abstract The interpretation of natural language quantifiers depends, in part, on one's prior expectations about what the proportion being described might be. This hypothesis is tested empirically, by comparing the interpretation of 10 different quantifier expressions in three contexts which contained proportions about which subjects' expectations were reliably different (Experiment 1). It is further argued that quantifiers perform many functions which cannot be observed by considering only the proportion(s) denoted by a quantifier. The experimental evidence presented shows that quantifiers can provide information about what the user of the quantifier had expected before “knowing the facts” (Experiment 2). It is also clear that when writers produce a quantifier, they can reveal their assumptions about the prior expectations held by their readers (Experiment 2). 相似文献