forming limit diagram (fld) is an important diagram by which the formability of sheet metals is studied. strain rate is a very effective parameter influencing the fld which is, in turn, influenced by the forming velocity. in this work, forming limit diagram for st14 was investigated both experimentally and numerically. in addition, the effect of forming velocity was studied and the experiments ...

in recent years, in order to reducing die design and manufacturing costs, multi point forming technique has gained an increasing interest because of its high flexibility. in this process, the conventional fixed shape solid die sets are replaced with a pair of opposite matrices of controllable elements. in this paper, the fundamental principles of multi-point forming was described and the possib...

Aluminum and magnesium alloys are of materials for decreasing vehicle weight and consequently reducing fuel consumption. However, forming limitations regarding their low formability at room temperature are found when being manufactured by conventional forming processes. For this reason, development of new forming techniques, such as warm tube hydroforming, is needed to overcome such limitations...

conclusions it seems that considering the clinical examination of patients before sa focusing on lumbar spinous process status, presence of lumbar deformity, calculation of bmi and radiological signs of lumbar vertebrae can be helpful in predicting sa difficulty. results hundred and one patients were enrolled. of these patients, 50 (49.5%) underwent sa by the first attempt of the first space, i...

it seems that endometriosis plays an important role in female factor infertility but a clear causal relationship has yet to be established. this case-control study was conducted to determine and compare the frequency and severity of endometriosis in 100 infertile women and 120 fertile multi-para women as control group. descriptive statistics, student t test and chi square test were used in anal...

The present study aimed to assess the presence and level of colonization of Candida in patients with oral mucosal lesions, to determine the presence or absence of candidal hyphae in biopsy specimens and to correlate the degree of epithelial dysplasia with the number of colony-forming units of Candida. We performed a prospective study including 50 patients diagnosed as having oral potentially ma...

The factors that determine which Helicobacter pylori infected subjects develop duodenal ulcer (DU) are unclear. This study tested the hypothesis that infection density and urease activity are higher in DU than non-DU subjects. Fifty five DU and 55 age and sex matched non-DU subjects were studied. Quantitative methods were used for measuring infection density (viable organism count) and urease a...

The increasing demands for lightweight design in the transport industry have led to an extensive use of materials such as aluminium alloys. forming sheets however presents significant challenges due low formability and increased susceptibility galling. tailored workpieces controlled die roughness surfaces are common strategies improve tribological behaviour, whilst galling is still not well und...

in this study, we evaluated the relationship between rhinosinusitis to the severity of asthma in asthmatic patients. this cross-sectional study was conducted on 90 patients with asthma referring to imam khomeini hospital in ardabil city. asthma control stepping method was used for staging of asthma severity. patients' clinical signs and paraclinical findings were individually evaluated and comp...

PURPOSE To establish a murine model of corneal candidiasis that permits molecular evaluation of fungal adherence and invasion. METHODS Corneas of immunocompetent, methylprednisolone-treated, and cyclophosphamide-treated adult NIH Swiss and BALB/c mice were topically mock inoculated or inoculated with 10-fold increasing amounts between 100 and 100 million colony-forming units (CFU) of Candida ...