the purpose of the present study was to compare the effects of two methods of self-modeling and video demonstration of an expert on the acquisition and retention of volleyball serve skill. participants were 30 students (aged between 12 and 14) who were assigned into two homogeneous groups after the pretest. the self-modeling group (n = 15) watched their performances in the criterion task via a ...

ad hoc networks are multi-hop wireless networks without a pre-installed infrastructure. such networks are widely used in military applications and in emergency situations as they permit the establishment of a communication network at very short notice with a very low cost. video is very sensitive for packet loss and wireless ad-hoc networks are error prone due to node mobility and weak links. h...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 background: ischemic heart diseases are the most common cardiovascular diseases. this study aimed to assess the effects of video training about risk factors based on health belief model on knowledge and attitude of myocardial infarction patients after discharge. methods: this was a quasi-experimental study conducted in 201...

background the present study was designed and conducted to determine the effect of video game play on pain of venipuncture in 3-6 year-old children. materials and methods this randomized controlled trial study was conducted on 80 hospitalized children with pain of venipuncture procedures. playing a video computer game for children during the venipuncture procedures was the intervention for the ...

Elastic constants of two-dimensional (2D) colloidal crystals are determined by measuring strain fluctuations induced by Brownian motion of particles. Paramagnetic colloids confined to an air-water interface of a pendant drop are crystallized under the action of a magnetic field, which is applied perpendicular to the 2D layer. Using video microscopy and digital image processing we measure fluctu...

The first demonstration of a GaNbased blue laser diode by Shuji Nakamura [ ] was followed by a tremendous research and development effort around the world. Gallium nitride technology enables a range of novel applications with vast consumer markets. Examples are full-color video displays, solid-state lighting, and high-definition DVD players. However, there still remains a strong need for a more...

We present a new method to measure hydrodynamic friction forces on colloidal particles at very low (ci 10~~) Reynolds numbers with high accuracy. Exploiting magnetic field induced aggregation of microcopic paramagnetic spheres into straight chains of calibrated length, we determine the anisotropic friction coefficient of the chains, with a range from one to 100 particles, by video-microscopic o...

PATIENT PRESENTATION A 48-year-old male presented with body aches and a chronic rash. He had no medical history aside from two unsuccessful treatments for presumed scabies and a recent diagnosis of psoriasis. Physical exam revealed hypotension, tachycardia, and profound, diffuse yellow crusting of the skin with erythematous erosions covering non-crusted areas (Figure). The patient was resuscita...

Localized fibrous tumours of the pleura (LFTP) are rare, generally benign and asymptomatic neoplasms, which originate from the pleural layers. We report on the case of a 67 year old woman who had a 1.5 cm diameter pulmonary nodule in the right upper lobe, which had been found by chance. Video-assisted thoracoscopy (VAT) was used to excise the nodule. The diagnosis of localized fibrous tumour of...