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a female common eider sits on nest, surrounded down feathers down also, down feathers or plumulaceous feathers. down of birds—their plumulaceous feathers, opposed pennaceous feathers—are layer of fine, silky feathers found under tougher exterior feathers, used humans thermal insulator , padding in goods such jackets, bedding, pillows , sleeping bags. considered simplest of feather types, down feathers have short or vestigial rachis (shaft), few barbs , barbules lack hooks, , (unlike contour feathers) grow both pterylae , apteria. young birds clad in down. loose structure of down feathers traps air, helps insulate bird against heat loss , contributes buoyancy of waterbirds. species experience annual temperature fluctuations typically have more down feathers following autumn moult. there 3 types of down: natal down, body down , powder down. drumming a form of non-vocal communication engaged in members of woodpecker family. involves beak striking hard surface multiple times per second. ...

the dja river numerous rivers run through south cameroon plateau, particularly in southeast. these bodies of water drain both atlantic ocean , congo river basin. rivers south of sanaga follow equatorial regime; is, reach high water point during rainy seasons , low point during dry seasons. there, rivers such dja, boumba, , sangha have carved out valleys. rivers flow , experience seasonal flooding during rainy season. the sanaga , rivers north of follow complex, or mixed, sudano-guinea regime because territory drain lies in both tropical , equatorial climate zones. means upstream, follow tropical regime, high water during long rainy season , low water during long dry season. however, further south, receive constant rainfall , flow steadily.

1 multiple-time female world champions 1.1 8 time world championships 1.2 7 time world championships 1.3 6 time world championships 1.4 5 time world championships 1.5 4 time world championships multiple-time female world champions 8 time world championships michelle nicolini, 2006–2014 7 time world championships leticia ribeiro, 2000–2012 hannette staack, 2002–2011 beatriz mesquita, 2012–2016 6 time world championships bianca andrade, 2001–2010 gabrielle garcia, 2008–2012 5 time world championships luanna alzuguir, 2009–2013 4 time world championships kyra gracie, 2006–2010 dominyka obelenyte, 2015–2016

gear cutting simulation (playing length 1m35s). as of 2014, estimated 80% of gearing produced worldwide produced net shape molding. molded gearing either powder metallurgy or plastic. many gears done when leave mold (including injection molded plastic , die cast metal gears), powdered metal gears require sintering , sand castings or investment castings require gear cutting or other machining finish them. common form of gear cutting hobbing, gear shaping, milling, , broaching exist. 3d printing production method expanding rapidly. metal gears in transmissions of cars , trucks, teeth heat treated make them hard , more wear resistant while leaving core soft , tough. large gears prone warp, quench press used.

wooden gears of historic windmill numerous nonferrous alloys, cast irons, powder-metallurgy , plastics used in manufacture of gears. however, steels commonly used because of high strength-to-weight ratio , low cost. plastic commonly used cost or weight concern. designed plastic gear can replace steel in many cases because has many desirable properties, including dirt tolerance, low speed meshing, ability skip quite , ability made materials don t need additional lubrication. manufacturers have used plastic gears reduce costs in consumer items including copy machines, optical storage devices, cheap dynamos, consumer audio equipment, servo motors, , printers. another advantage of use of plastics, formerly (such in 1980s), reduction of repair costs expensive machines. in cases of severe jamming (as of paper in printer), plastic gear teeth torn free of substrate, allowing drive mechanism spin freely (instead of damaging straining against jam). use of sacrificial gear teeth avoided destr...

piazza largo del popolo on labour day (may, 1st) colourful pageant held throughout village s high streets celebrate lu maje (the may), circle-shaped wooden cane decked small bunches of wild pink underbrush violets , other spring flowers , carried @ forefront of pageant, kicks off @ main church after late morning mass. flowers gifted families of village during door-to-door parade. marching band plays along while food-and-drinks stalls set out on streets. in august, when village comes alive expatriates, night-time food feasts (called sagre) common. 1 of these sagn app zat (literally sagnas cut pieces ), freshly made, thick pasta layers sliced rough 5-by-5-centimetre (2 2 in) squares , eaten simple basil-and-tomato sauce, extra-virgin olive oil, , topped lumps of ricotta cheese and/or bits of sliced spicy red chillies. on every second saturday of october, food feast of scurpelle—simple salted sourdough batons, 20 30 centimetres (8 12 in) long, deep-fried in olive oil , eaten su...

models of watchtowers , other buildings made during eastern han dynasty (ad 25–220); while these models made of ceramics, real versions made of perishable wood , have not survived. unlike other building construction materials, old wooden structures not survive because more vulnerable weathering , fires , naturally subjected rotting on time. although now-nonexistent wooden residential towers, watchtowers, , pagodas predated centuries, songyue pagoda built in 523 oldest extant pagoda in china; use of brick instead of wood had endurance throughout centuries. tang dynasty (618–907) onwards, brick , stone architecture gradually became more common , replaced wooden edifices. earliest examples of transition can seen in building projects such zhaozhou bridge completed in 605 or xumi pagoda built in 636, yet stone , brick architecture known have been used in subterranean tomb architecture of earlier dynasties. a stone-carved pillar-gate, or que (闕), 6 m (20 ft) in total height, located...