Báo cáo hóa học: " Symmetry Properties of Single-Walled BC2N Nanotubes" pdf

... T R2 to a 2 . An example of each type of BC 2 N nanotubes is given in Fig. 1b–f. Symmetry of BC 2 N Nanotubes We first consider the achiral carbon nanotubes with the rotation axis of order n, i.e., zigzag ... reduce to C nv due to the lack of horizontal symmetry axis/plane, and S 2n vanishes for the lack of the screw axis. Thus, G zzÀ1 n½¼L T z  C nv  E ð2Þ The point group...

Ngày tải lên: 22/06/2014, 01:20

... health-related quality of life, depression, and cogni- tive difficulties [4]. Assessing the effectiveness of new ther- apies therefore requires accurate assessment of a multi- dimensional array of symptoms ... Awakening Short of Breath or with a Headache, Quantity of Sleep, Sleep Adequacy, and Somnolence) and an overall Sleep Problems Index score [15]. The Quantity of Sleep subs...

Ngày tải lên: 18/06/2014, 18:20

... measurement properties of health status questionnaires. Journal of Clinical Epidemiology 2007, 60:34-42. 28. Sartorius N, Kuyken W: Translation of health status instru- ments. In Quality of Life ... 75% of the 'improved' and 77% of the 'unchanged' participants. Discussion In this cross-sectional and longitudinal study of patients with dizziness, measurement...

Ngày tải lên: 18/06/2014, 19:20

... 9 of 10 (page number not for citation purposes) It is essential to examine the measuring properties of the instruments used in the evaluation of health status or HRQOL for the interpretation of ... presence of a representative essential [2,32]. Due to these limitations, the presence of a representative of the child or of the patients with developmental disor- ders has the ad...

Ngày tải lên: 18/06/2014, 19:20

... hospitals of the city. A total of 190 families of Bra- zilian children between the ages of 2 and 18 years, of both genders, with malignant neoplasm in various phases of treatment or control of the ... indicators of BioMed Central Page 1 of 11 (page number not for citation purposes) Health and Quality of Life Outcomes Open Access Research Measurement properties of the B...

Ngày tải lên: 18/06/2014, 22:20

... 19(1):1-15. BioMed Central Page 1 of 10 (page number not for citation purposes) Health and Quality of Life Outcomes Open Access Research Psychometric properties of two measures of psychological well-being ... fact that one of the six subscales of the original PGWB concerned general health. However, the GWBI could not be described as a measure of health status as only a small...

Ngày tải lên: 20/06/2014, 15:20

... five of the eight SF- 36 scales The pattern of associations of the two BPI scales with corresponding and non-corresponding scales of the WOMAC and SF-36 largely supported the construct validity of ... reliability with Cronbach’s alpha >0.80 in assessment of pain and the impact of pain [36]. The pattern of observed correla- tions between subscales of the BPI measuring cons...

Ngày tải lên: 20/06/2014, 15:20

... Wettergren 1 Abstract Background: The aim was to evaluate data quality and psychometric properties of an instrument for measurement of health-related quality of life: DISABKIDS Chronic Generic Module (DCGM-37) used in school-aged ... Pooling of data is recommended when sample sizes are limited in order to increase precision of estimates [14,15]. Feasibility of the DCGM-37 was ex...

Ngày tải lên: 20/06/2014, 16:20

... of the MoS 2 nanotube during the first stage of the exfoliation process; (d) TEM micrograph of the MoS 2 single layers as a final stage of nanotube exfoliation; (e) AFM image (contact mode) of ... friction coefficient of 0.05 [17]. Ultra-low friction of 0.003 was reported between MoS 2 flakes and MoS 2 surfaces [18]. The pro- blem of edge oxidation and preservation of the fl...

Ngày tải lên: 20/06/2014, 22:20