Possible retardation effects of quark confinement on the meson spectrum

The reduced Bethe-Salpeter equation with scalar confinement and vector gluon exchange is applied to quark-antiquark bound states. The so called intrinsic flaw of Salpeter equation with static scalar confinement is investigated. The notorious problem of narrow level spacings is found to be remedied by taking into consideration the retardation effect of scalar confinement. Good fit for the mass spectrum of both heavy and light quarkomium states is then obtained.Comment: 14 pages in LaTex for

Large Possible retardation effects of quark confinement on the meson spectrum II

We present the results of a study of heavy-light-quark bound states in the context of the reduced Bethe-Salpeter equation with relativistic vector and scalar interactions. We find that satisfactory fits may also be obtained when the retarded effect of the quark-antiquark interaction is concerned.Comment: 11 pages, RevTex, to appear in PR

Kapitalna kampanja

Ne možete prikupljati novac u negativnom okruženju. Ljudi koji rade na takvom poslu moraju načelno biti pozitivni. Ne mogu dovoljno naglasiti koliko je važna suradnja između ljudi koji rade na namicanju sredstava i kustosa s druge strane. To sve zajedno mora biti timski rad

Exploring limb symmetry index for balance across a range of functional tasks.

Introduction: Body symmetry and functional reciprocity represent key components of normal movement (Lu & Chang 2012, Sadeghi et al 2000, Watkins 1999) making them essential components of clinical examination. To this end a limb symmetry index (LSI) of 80 – 90% of the unaffected limb has been proposed by previous authors (Daniel et al 1982, Barber et al 1990, Sapega 1990, Petschnig et al 1998). Whilst LSI has been reviewed for a large variety of potential variables, the LSI for balance remains largely unexplored. Balance is viewed as an integral part of maintaining everyday physical activity, a good quality of life and reducing health burden (Clark et al 2016). Therefore, this study aimed to determine the LSI for balance across a variety of functional tasks; whilst reviewing the use of novel yet clinically reproducible methodology. Method: A cross-sectional observational design was used. Seventeen participants (mean age 27.6±5.7 years) were recruited from the student population at Bournemouth University. Participants reported no existing injury or other balance affecting condition. Balance was measured using two devices: an instrumented wobbleboard (SMARTwobble, THETAmetrix, UK) and a sacral mounted accelerometer (Balance Sensor, THETAmetrix, UK). Participants completed a variety of tasks including forward, lateral and medial hop landing where sacral acceleration was measured for 1 second following landing. Task analysis was completed using SPSS v23, MatLab and Excel. Results: No statistically significant differences occurred between dominant and non-dominant limb for any of the assessed tasks. The absolute mean percentage difference between limbs was 4.9%±3.7% (95% CI 1.8% - 8.0%). ICC values ranged from 0.73 – 0.96 suggesting moderate to excellent test-retest reliability for accelerometry and wobbleboard. Discussion: The LSI for balance should be expected to be around 5% regardless of task. Sacral mounted accelerometry, represents a valid and reliable measurement device, for a variety of complex balance assessment tasks including hop landing. Instrumented wobbleboards may also provide a valid and reliable, clinically accessible method for measuring limb symmetry, but may not be appropriate for evaluating a variety of tasks

Muzej moderne umjetnosti New York: fundraising i financiranje izložbe

Umjetnost nema samo estetsku vrijednost, umjetnost je ujedno pokretač ekonomskog razvoja i razvoja kulturnog turizma, pogotovu u jednom kozmopolitskom gradu kakav je New York

Technique utilisation and efficiency in competitive Brazilian Jiu-Jitsu matches at white and blue belts

Despite its increasing popularity, little is known about Brazilian Jiu- Jitsu and what makes a successful fighter. This work aims to start answering questions about the most used and successful techniques to allow development of coaching methods towards enhancing performance at lower belt levels. One-hundred and forty tournament fights were analysed. The most common takedown was guardpull with 94% success. Significantly more single leg takedowns were attempted for blue belts (BBs), compared to white belts (WBs) (p = 0.013). However, there was no significant difference in success (p = 0.150). WBs used three main guardpasses with 93% covering knee slice, knee pin and bullfighter. A greater variety of passes were witnessed at BB with 71% coming from these three passes. The four most commonly attempted guard sweeps were scissor sweep, back take, Xguard sweep and SitUp sweep all experiencing varying levels of success: 55% for the scissor sweep, 60% back take, 63% Xguard sweep and 38% for the sit up sweep. Of all the submissions attempted 34% were for arm bar, 21% triangle, 12% cross collar choke but there were almost an inverse relationship between use and success with the least used having higher success rates, demonstrating that variety in submissions could lead to greater chances of success

A measure of adaptation to problematic academic and interpersonal tasks of middle school

This study examined the development and validation of a measure of adaptation to problematic academic and interpersonal tasks that arise during the transition to middle school (Survey of Adaptational Tasks of Middle School -- SAT-MS). In terms of Bronfenbrenner's framework of "ecological transitions," a set of psychosocial tasks was reliably identified, and the perceived impact of these tasks was found to be related to self-concept and perceived school environment. Sex differences consistent with differential development expectations emerged. The results suggested that for girls, peer relationship tasks were most salient with regard to criterion measures, whereas for boys, peer relationshipm conflict with authority, and academic pressure tasks all related to criterion measures. The major findings were replicated for both a predominantly white, suburban sample and a predominantly urban, nonwhite sample. The results are discussed in terms of the needs of children during periods of adaptational challenge.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30113/1/0000488.pd