AIM To show the relationship of lumbar intervertebral discs with ureters by using computerized tomography (CT). MATERIAL AND METHODS Eighty patients (male/female: 42/38) a mean age 45 years were included in this retrospective study. An imaginary line passing through tangential to posterior cortex vertebral body was drawn at disc level (line a). Perpendicular two lines b) from ureters.The cortex...

The article presents an analytical model for evaluation of ion angular distribution functions ~IADFs! at a radio frequency ~rf!-biased surface in a high-density plasma reactor. The model couples a unified rf sheath model to an assumed ion velocity distribution function-based formulation for determining the IADF under any general rf-bias condition. Under direct-current ~dc! bias conditions the I...

The crack-propagation form may appear as an arbitrary mixed-mode fracture in engineering structure due to irregular internal crack. It is of great significance research the materials with cracks. coupling effect multiple variables (crack height ratio, horizontal deflection angle and vertical angle) on parameters such stress intensity factors T-stress are key points this paper. A three-point ben...

The surface alignment of lyotropic chromonic liquid crystals can not only be planar (tangential) but also homeotropic, with self-assembled aggregates perpendicular to the substrate, as demonstrated by mapping optical retardation and by three-dimensional imaging of the director field. With time, the homeotropic nematic undergoes a transition into a tangential state. The anchoring transition is d...

In this paper, a multi-objective optimization method is proposed to address the problem in process of generator that only specific index can be optimized neglect other performance indices. Based on equivalent magnetic circuit method, mathematical model radial-tangential combined permanent magnet pole established, and expression cogging torque including offset angle derived. The as design variab...

In the current study, we conducted four idealized hurricane simulation cases to investigate basic wind characteristics of hurricanes at different sea surface temperatures. First, relationship minimum pressure and maximum time-averaged speed shows good agreement with observational data theoretical considerations. Then, tangential, radial, vertical field are analyzed, both value height tangential...

for assessment and comparison of measuring density methods of festuca ovina, bromus tomentellus and prangos ferulacea, three plants communities are selected. in all of plant community, reference area was defined and samples 7000 (70*100) square meter was selected. whole the area, sampling was accumplished as systematic-random. in each area, 5 transect 100 meter are established. then in areas 70...