A retrospective analysis was performed on forty cases of spinal cord meningiomas, operated on at Dr. Shariati Hospital from 1976 to 1990. Age and sex distribution, clinical presentation and tumor location were comparable to those reported by others. In males the tumors were distributed evenly in cervical and dorsal areas and were often anterior to the cord. This finding makes a different s...

this survey is aimed to compare the hierarchical structure of subject directories, including yahoo, the open directory and looksmart with dewey decimal classification (ddc) in 10 selective subjects. five questions are raised to compare the broadness and the depth of the hierarchical structures in the subject directories and ddc and to study the effectiveness of the usage of ddc in the organizat...

The problems encountered during scuba diving may be a contributing factor in an episode of decompression illness (DCI). Evidence exists that there may be a relationship between the position in the menstrual cycle and the occurrence of DCI. We examined, by prospective observation in female recreational scuba divers, any interaction between reported problems during diving (RPDD) and the position ...

in this research 400 ross 308 breeder fertile eggs were weighed at day 16 of incubation and evenly distributed into 4 treatments with 4 replicates per treatment and 25 eggs per replicate in a crd design. on day 18 of incubation, 1 ml of an in ovo feed solution including: i) carbohydrate (cho), ii) amino acid (aa), and iii) butyric acid solution in 0.5% saline was injected into amniotic fluid of...

A novel method is proposed in this paper to address the cutting-edge problem of topology optimization of distributed compliant mechanisms, which requires the design to possess both large output displacements and evenly distributed compliance simultaneously. The design is represented by a level-set model that precisely specifies the distinct material regions and their sharp interfaces as well as...

There is no single standard technique or methodology to characterize the size, structure, number, and chemical composition of airborne carbon nanotubes.  Existing analytical instruments and analytical techniques for evaluating nanoparticle concentrations cannot simultaneously provide morphology, state of agglomeration, surface area, mass, size distribution and chemical composition data critical...