【正文】 s Day! in shops, hotels and restaurants. But few young women will mark the festival with their boyfriends, or take part in traditional activities to pray for cleverness. 21 。s Day on February 14, characterized by bouquets of roses, chocolates and romantic candlelight dinners, than they do about their homegrown day for lovers. Even Qixi is nowadays referred to as the Chinese Valentine39。s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a year on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughters39。s time for the wild fruits to ripe. The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If itShutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Nestled close to the country39。llg=Jt=J1+（1/i2)[(J2+Js）+W/g（S/2π)2]Printf(“%f”,jt)｝請您刪除一下內(nèi)容，O(∩_∩)O謝謝?。?！Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。scanf(“%f”,amp。scanf(“%f”,amp。scanf(“%f”,amp。scanf(“%f”,amp。scanf(“%f”,amp。float g。float w。float j1。8. 毛謙德，9. 徐灝?！?Mmax.性能完全滿足本機(jī)器，因此從精度和成本角度考慮選用百格拉公司的VRDM397三相混合式步進(jìn)電機(jī)。負(fù)載力矩和最大靜力矩Mmax負(fù)載力矩按式（15）和式（16）計(jì)算，電機(jī)在最大進(jìn)給速度時(shí)，由矩頻特性決定的電機(jī)輸出力矩要大于Mf與Mt之和，并留有余量。時(shí)，由矩頻特性的輸出力矩應(yīng)能驅(qū)動(dòng)負(fù)載，并留有足夠的余量。若負(fù)載參數(shù)無法精確確定,則可按fq=1/2fq0進(jìn)行估算.fq0空載起動(dòng)頻率（17）(1+Jt/Jm)]負(fù)載起動(dòng)頻率估算數(shù)控系統(tǒng)控制電機(jī)的啟動(dòng)頻率與負(fù)載轉(zhuǎn)矩和慣量有很大關(guān)系，其估算公式為Mt切削力折算至電機(jī)力矩（)Mt=()/(2πηi)10ˉ2u摩擦系數(shù)（15）T電機(jī)升速時(shí)間（s）Jm、Jt電機(jī)自身慣量與負(fù)載慣量()式中MaMa=（Jm+Jt).n/T10ˉ2M=Ma+Mf+Mt絲桿螺距（cm）W工作臺(tái)重量（N）JsJJ2式中JtJt=J1+（1/i2)[(J2+Js）+W/g（S/2π)2]=Δ(mm/脈沖）S式中φ根據(jù)所要求脈沖當(dāng)量，齒輪減速比i計(jì)算如下: 110 98 92 86 80 68模擬結(jié)果20至62μs20 26 32 38 44 50 56 62 實(shí)驗(yàn)觀察20至62μs在液滴飛行距離方面，為模擬與實(shí)驗(yàn)結(jié)果之比較；在液滴體積方面，實(shí)驗(yàn)觀察之液滴體積為236 pl，模擬結(jié)果之液滴體積為229 pl。 56 504438 20 26 模擬與實(shí)驗(yàn)在80μs時(shí)有些許的差異，實(shí)驗(yàn)照片之部份尾液滴和液滴串已脫離而在模擬結(jié)果上則尚未完全脫離，以致80μs之后，模擬結(jié)果之尾液滴較大、尾液滴較實(shí)驗(yàn)早形成圓球體。在40μs后噴嘴上方開始產(chǎn)生負(fù)壓力，在4450μs，噴口附近的液體受到噴嘴內(nèi)部向上拉回之負(fù)壓力，使得向下速度減小，同時(shí)并受到下方液滴串之表面張力相互作用，于是產(chǎn)生頸縮現(xiàn)象，由模擬結(jié)果與實(shí)驗(yàn)照片可知液滴串均在5662μs之間產(chǎn)生斷裂，在此階段模擬與實(shí)驗(yàn)具有高度的一致性