Abstract. In this paper, we consider an equivalence problem of second order partially differential equations (PDE) and a duality of the flat differential equation. For the equivalence problem, explicit form of invariants (curvatures) are given. In particular, if all of the curvatures vanish, then PDE are equivalent to the flat equation. We also investigate a duality associated with the flat equ...

Limited studies have examined the effect of differential item functioning (DIF) on comparing health related quality of life (HRQoL) scores across child self-reports and parent proxy-reports. This study aims to determine whether parents and children respond differently to the items in the Persian version of the PedsQoLTM 4.0 measure. The PedsQLTM 4.0 Generic Core Scales was completed by 938 chil...

Unicystic ameloblastoma is a tumor of odontogenic origin. It is not a rare neoplasm and most often the lesion is asympthomatic. However, large lesions may cause painless swelling of the jaws. Here we report a case of unicystic ameloblastoma with pain, swelling of the posterior jaws along with teeth mobility. Samples of incisional biopsy of the lesion and also interaoperative frozen section were...

When we interpret an ECG we compare it instantaneously with the normal ECG and normal variants stored in our memory; these memories are stored visually in the posterior parts of the cerebrum and intellectually in the frontal parts. If these reservoirs contain only question marks, we are as helpless and lost in our interpretation as someone wandering through a snowstorm without a compass. It is ...

When we interpret an ECG we compare it instantaneously with the normal ECG and normal variants stored in our memory; these memories are stored visually in the posterior parts of the cerebrum and intellectually in the frontal parts. If these reservoirs contain only question marks, we are as helpless and lost in our interpretation as someone wandering through a snowstorm without a compass. It is ...

When we interpret an ECG we compare it instantaneously with the normal ECG and normal variants stored in our memory; these memories are stored visually in the posterior parts of the cerebrum and intellectually in the frontal parts. If these reservoirs contain only question marks, we are as helpless and lost in our interpretation as someone wandering through a snowstorm without a compass. It is ...

A sample of 20 men (10 right-handed, 10 left-handed) was selected. Using the method of constant stimuli, the number of correct responses and the differential threshold for weight and roughness for both hands, were studied. The findings were: (1) In the weight test, the number of correct responses was greater and the differential threshold lower in the right-handed than in the left-handed subjec...