Floods control equipment in large dams is one of the most important requirements hydraulic structures. Howell–Bunger valves and butterfly are two these types flow controls that commonly used bottom outlet dams. The optimal longitudinal distance (L) between such turbulence from valve should be dissipated before entering valve. Subsequently, passing through must have a fully developed state reach...

purpose: to report a case of butterfly-shaped macular dystrophy. patient and findings: a 34-year-old woman presented with metamorphopsia in both eyes from 2 years ago. visual acuity was 9/10 in right eye and 10/10 in left eye. there was no pathologic finding on slit lamp biomicroscopy and funduscopy other than mild macular retinal pigment epithelium mottling. visual fields and electroretinogram...

In the present study, flow characteristics of butterfly valves with different sizes DN 80 (nominal diameter: 76.2 mm), 262 254 400 406 mm) were numerically investigated under valve opening percentages. Representative two-equation turbulence models k-epsilon model Launder and Sharma, k-omega Wilcox, SST Menter selected. Flow examined to determine effects. It was determined that increasing effect...

Results Our surgical strategy for active IE is 1) complete debridement of infective tissue, 2) reconstruction with biological material. Six cases of 21 required reconstruction of the aorto-mitral continuity using butterfly shaped bovine pericardial patch in 4, and mono bloc aorta-mitral tissue valves replacement in 2. For the other 15 cases, resected aortic annulus were reconstructed using peri...

Heating extraction steam (HEXTR) flow rate is the key parameter to determine heat load of a combined and power (CHP) plant safe operation area turbine CHP plant. Due difficulty direct measurement, soft measurement method this proposed. First, three calculation methods based on different principles are given: Flügel formula method, butterfly valve characteristics improvement balance characterist...

An innovative type called "butterfly-shaped links steel plate shear wall (BLSPSW)" was proposed as a lateral load resisting system. In this novel system, by creating butterfly-shaped links in the four sides of the web plate, the lateral load resisting mechanism is not the development of a diagonal tension field on the web plate (similar to Conventional SPSWs), but the capacity of the system is ...

A valve is a device that control or regulate the fluid in pipe line, which commonly used all industries like oil and gas, process, power, mining, etc. Valves are mainly classified into two types, namely, linear motion rotary motion. butterfly among family of (quarter turn valve) having metal closure plate along with middle shaft, acts as rotating axis. The quarter valves fast to open close they...