【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. 。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 largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs 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. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。 g= Jt=J1+（ 1/i2)[(J2+Js） +W/g（ S/2π )2] Printf(“ %f” ,jt) ｝ 22 請(qǐng)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，李振清主編 .機(jī)械設(shè)計(jì)師手冊(cè) .機(jī)械工業(yè)出版社 .第二版 附錄 20 9. 徐灝，蔡春源主編 .機(jī)械設(shè)計(jì)師手冊(cè) .機(jī)械工業(yè)出版社。一般來說， Mf與 Mt之和應(yīng)小于（ ～ )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)。(1+J t/Jm)] 1/2 （ 17） 式中 fq帶載起動(dòng)頻率（ Hz） fq0空載起動(dòng)頻率 Ml起動(dòng)頻率下由矩頻特性決定的電機(jī)輸出力矩（ ) 若負(fù)載參數(shù)無法精確確定 ,則可按 fq=1/2fq0進(jìn)行估算 . 運(yùn)行的最高頻率與升速時(shí)間的計(jì)算 由于電機(jī)的輸出力矩隨著頻率的升高 而下降，因此在最高頻率 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。從液滴形態(tài)、斷裂時(shí)間、飛行距離與體積等四方面，模擬結(jié)果與實(shí)驗(yàn)觀察比對(duì)具有不錯(cuò)的吻合。模擬結(jié)果在 8692μs 之間因表面張力作用，尾液滴和主液滴分離，形成衛(wèi)星液滴，由于衛(wèi)星液滴的速度扔較主液滴大，在 92104μs 趕上主液滴并結(jié)合成單一液滴；在實(shí)驗(yàn)照片上，衛(wèi)星液滴與主液滴則在 104110μs 合成單一液滴。 在 62μs 之后，液滴串已經(jīng)完全和噴嘴分離，形狀具有圓渾的頭端和細(xì)長的尾端，由于尾端受到表面張力的作用，產(chǎn) 生一向下的加速度，使細(xì)長的尾端向下之速度迅速增加并追上頭端的速度，頭尾兩端相互靠近，液滴串的長度開始減小，由于尾端質(zhì)量的累積致使體積也變大形成尾液滴。在 2638μs ，因?yàn)檎龎毫Τ掷m(xù)作用而給予液滴一加速度，因此液滴速度與長度均增加。 圖 模擬彈射序列的液滴參數(shù)圖 模擬結(jié)果如圖所示，圖中 20110μs 所對(duì)應(yīng)之實(shí)驗(yàn)觀測照片如圖所示。視角為與水平面呈 30 度，由圖可以清楚觀察從液滴生成、液滴串?dāng)嗔?、尾液?(tail droplet)成形、衛(wèi)星液滴與主液滴結(jié) 合成單一液滴、液滴撞擊到標(biāo)的與撞擊后液滴擴(kuò)張到最大半徑之模擬結(jié)果。 步驟 3: 計(jì)算 F 值的傳遞及傳遞后 F值的分布 為了能夠在自由表面的邊界上獲得較準(zhǔn)確的速度與壓力，本研究將表面張力的效應(yīng)納入考慮并采用 Kothe 等所提出的 CSF 模式，并推導(dǎo)至三維的狀態(tài)， CSF Model將表面張力視為一連續(xù)的、橫跨于界面的 作用力，等同于動(dòng)量方程式中的 body force Fb，并由下式求得 仿真系統(tǒng)首先以水來作測試。 步驟 1: 建立 /重建自由表面。 第四章．噴頭的仿真模擬以及電機(jī)的計(jì)算 16 在處理 F 的傳遞時(shí)，近似的界面 位置必需被重建，以便提供正確 F 傳輸量的計(jì)算及決定表面區(qū)