Temperament and friendship in preschool-aged children

2005 ◽  
Vol 29 (4) ◽  
pp. 336-344 ◽  
Author(s):  
Tracy R. Gleason ◽  
Amy L. Gower ◽  
Lisa M. Hohmann ◽  
Terry C. Gleason

The influence of three components of temperament (activity level, impulsivity, and soothability) on children's friendships was investigated. Children (40 girls, 35 boys) aged 43 to 69 months responded to a sociometric interview and teachers provided temperament ratings. The probability of children choosing particular classmates as friends was evaluated based on the genders and temperaments of the dyad. A logistic choice model revealed that the choice of friends is highly influenced by gender, high impulsivity, and high soothability. Furthermore, the gender of the chooser and the activity level of the friend interacted such that girls chose low activity level friends and boys chose high activity level friends. In addition, the likelihood of a child being chosen as a friend based on gender and temperament was significantly correlated with popularity for girls, but not for boys.

2020 ◽  
Author(s):  
Abiyot Workayehu ◽  
Heikki Vanhamäki ◽  
Anita Aikio

<p><span>We present statistical investigation of the high-latitude ionospheric current systems in the Northern hemisphere (NH) and Southern hemisphere (SH) during low (Kp < 2) and high (Kp ≥ 2) geomagnetic activity levels. Nearly </span><span>four </span><span>years of vector magnetic field measurements are analyzed from the two parallel flying Swarm A and C satellites using the spherical elementary current system (SECS) method. The ionospheric horizontal and field-aligned currents (FACs) for each auroral oval crossing are calculated. The mean values of FACs, as well as the horizontal curl-free (CF) and divergence-free (DF) currents in 1<sup>o</sup> magnetic latitude by 1 h magnetic local time grid cells, are calculated for each hemisphere and activity level. To estimate the NH/SH current ratios for the two activity levels, we remove seasonal bias in the number of samples and in the Kp distribution by bootstrap resampling. </span></p><p><span>Averaging over all seasons, we found that for the low activity level the currents in the NH are stronger than in the SH by 12 ± 4 % for FAC, 9 ± 2% for the horizontal CF current and 8 ± 2% for the horizontal DF current. During the high activity level, the hemispheric differences are not statistically significant. </span></p><p><span>When making the statistical analysis for the four seasons separately, we find a seasonal dependence in the hemispheric asymmetry. During low Kp conditions, both FACs and horizontal currents are larger in the NH than SH with the largest difference observed in winter. In winter, the currents in the NH are larger than the SH by 21 ± 5 %  for FAC, 14 ± 3% for the horizontal CF current and 10±3%  for the horizontal DF current. During the high activity level, the asymmetry is smaller compared to the low activity level with the largest and smallest hemispheric differences observed in autumn and summer, respectively. In autumn, the currents in the NH are larger than the SH by 8 ± 5%  for FAC, 9 ± 2%  for the horizontal CF current and 8 ± 3%  for the horizontal DF current. Interestingly, during high Kp conditions, the NH/SH ratio of horizontal current is >1 in autumn and <1 in spring. </span></p><p><span>The physical mechanism producing the hemispheric asymmetry is not known. One hypothesis is that the local ionospheric conditions, such as magnetic field strength or daily variations in insolation may play a role. We present preliminary results indicating that only a small part of the seasonal dependence in the NH/SH total current ratios can be explained by variations in the background conductances caused by solar irradiance and affected by local hemispheric values of the magnetic field.</span></p><p> </p><p> </p><p> </p>


2017 ◽  
Vol 33 (10) ◽  
pp. e169-e170
Author(s):  
Suzanne Witjes ◽  
Jillian Jung ◽  
Robert Litchfield ◽  
Kevin Willits ◽  
Dianne Margaret Bryant ◽  
...  

2014 ◽  
Vol 2 (11_suppl3) ◽  
pp. 2325967114S0021
Author(s):  
Nurzat Elmali ◽  
Reha Tandogan ◽  
Murat Bozkurt ◽  
Murat Demirel ◽  
Tahsin Beyzadeoğlu

Objectives: To determine the approaches of Turkish Orthopaedic and Traumatology specialists towards the treatment of isolated focal cartilage lesions in the knee joint. Methods: An online questionnaire consisting of 21 questions was prepared and sent to a sample group comprising members of the Turkish Orthopaedics and Traumatology Association (TOTBID) and the Turkish Sports Injuries Arthroscopy and Knee Surgery Association (TUSYAD). The responses of 129 members were evaluated. Results: Of the total respondents to the questionnaire, approximately 1/3 worked in a private hospital, 1/3 in a university, 15% in a state hospital and 13% in a training and research hospital. An arthroscopic approach was applied fewer than 50 times per year by 20% of respondents, 50-100 times by 40%, 100-200 times by 24% and more than 200 times by 17%. The upper age limit for surgical repair of cartilage was reported as 50 years by 52% and 40 years by 25%. Similarly, the body mass index (BMI) upper limit was stated as below 30kg/m2 by 58% and below 25kg/m2 by 22%. The best results were thought to come from femoral condyle lesions by 85% of the surgeons. In patients with high activity expectations, the most frequently applied methods were 60% microfracture and 40% mosaicplasty. For lesions between 2.5 and 4cm2 in size, mosaicplasty was applied most often, followed by matrix-supported chondrocyte implantation. In lesions larger than 4cm2, MACI was the most common procedure. Although 70% of surgeons had never applied the matrix-supported microfracture method, 30% considered that it could be a choice for individuals with a high activity level. A return to sports following cartilage repair was accepted as 6 months for microfracture (86%), 9 months for mosaicplasty (63%), and 12 months for matrix-supported autologous chondrocyte implantation (73%). Conclusion: As there was a similar distribution of experienced and less experienced surgeons among the respondents, the results obtained from the questionnaire are significant in terms of reflecting the general perspective in the country. That mosaicplasty was the first choice for lesions over 2.5cm2 in individuals with a high activity level may be related to poor long-term results of microfracture in large defects. Although it is not widely used in our country and social security repayments are limited, it was noteworthy that for defects over 4cm2, the first choice was second generation autologous chondrocyte implantation. Similarly, it is significant that a third of the surgeons stated matrix-supported microfracture as a choice for high activity patients, although it is not often applied. Decision makers in institutions making repayments should take into account that large defects require methods which are relatively more expensive and need high technology. The results obtained here of an upper age limit of 50 years and BMI below 30kg/m2 for cartilage repair are consistent with literature. A return to sports is planned as 6 months at the earliest and a longer period after more complex surgery.


Author(s):  
E. D. Collins ◽  
D. O. Campbell ◽  
L. J. King ◽  
J. B. Knauer ◽  
R. M. Wallace

2000 ◽  
Vol 198 ◽  
pp. 508-509
Author(s):  
C. H. F. Melo ◽  
B. B. Soares ◽  
A. C. Mirandar ◽  
J. R. P. Da Silva ◽  
J. R. De Medeiros

We analyse the behavior of the projected rotational velocity vsin i for a sample of 20 lithium-rich evolved stars. Most of these stars show normal rotational velocity with respect to the typical lithium-normal evolved stars of the same spectral type. Stars presenting enhanced rotation show also high activity level. No sign of binarity was found for these lithium-rich evolved stars.


2021 ◽  
Vol 53 (5) ◽  
pp. 894-903
Author(s):  
Lasse Gliemann ◽  
Nicolai Rytter ◽  
Liu Yujia ◽  
Andrea Tamariz-Ellemann ◽  
Howard Carter ◽  
...  

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