To determine the layout parameters of gas drainage roadway (GDR) serving for working face, an analytical calculation method fracture zone and modelling experiment were adopted, overburden fissure induced by mining height analyzed. For research on distribution method, multiple factors influencing failure mode strata considered. The #1207 face in Sima mine was taken as engineering background, GDR...

a facility layout problem is concerned with determining the best position of departments, cells, or machines on the plant. an efficient layout contributes to the overall efficiency of operations. it’s been proved that, when system characteristics change, it can cause a significant increase in material handling cost. consequently, the efficiency of the current layout decreases or is lost and it ...

there are some problems with estimating the time required for the manufacturing process of products, especially when there is a variable serving time, like control stage. these problems will cause overestimation of process time. layout constraints, reworking constraints and inflexible product schedule in multi product lines need a precise planning to reduce volume in particular situation of lin...

Let G be a finite group generated by reflections. It is shown that the elements of G can be arranged in a cycle (a "Gray. code") such that each element is obtained from the previous one by applying one of the generators. The case G = d[ ' yields a conventional binary Gray code. These generalized Gray codes provide an efficient wa), to run through the elements of any finite reflection group.

Climate is one of the many factors such as socio-cultural values, economics, materials,administrative factors and technology that influence architectural forms. The climatic solutions effecting on architecture,differ in various regions, cultures, time and technology. The climate of the province of Golestan plays an active rolein the formation and diversity of vernacular dwellings. This region i...

welders may suffer from welding fumes generated during the process if the ventilation systems are improperly applied. the objective of the present work was to study the mitigation of air pollutants at welding stations, using different ventilation scenarios. four air pollutants including iron oxide, respirable dust, ozone, and carbon monoxide were measured during four different ventilation scena...

conclusions: rsbi and apache ii score in patients with copd exacerbation are of the ability to predict niv requirement, as a predicting factor of non-invasive ventilation requirement. results: patients requiring niv included 43.9 % of all studied patients. rsbi and apache ii score with sensitivity of 94.8 %, (cut off point = 110) and 72 % (cut off point = 14) respectively, had high diagnostic s...

results sixty patients were involved in this study. in asv mode, values including peak airway pressure (p-peak), end-tidal carbon dioxide (etco2), tidal volume and respiratory dead space were significantly lower than simv mode. although the mean value for dynamic compliance had no significant difference in the two types of ventilation, it was better in asv mode. methods in a crossover study, pa...

background: methanol is a colorless and poisonous liquid that is commonly used as an industrial and household solvent. methanol poisoning is a rare but extremely hazardous form of in toxication that affects the central nervous system and causes visual disorder, drowsiness, seizures and coma.  case presentation: a 29-years-old man with methanol intoxication presented with drowsiness and acidosis...