【正文】 s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready 新鄉(xiāng)學(xué)院本科畢業(yè)論文（設(shè)計(jì)） 26 reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39。 Festival. In this day, girls will throw a sewing needle into a bowl full of water on the night of Qixi as a test of embroidery skills. If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders. Single women also pray for finding a good husband in the future. And the newly married women pray to bee pregnant quickly. Tradition transformed The love story of Niulang and Zhinu, and the Qixi Festival have been handed down for generations. Yet these ancient traditions and customs are slowly dying out. Many modern Chinese, particularly youngsters, seem to know more about St Valentine39。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 it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39。 ll wait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the uping Golden Week it may not be a bad idea to avoid some of the most crowded places for now. There is always a place so fascinating that everyone yearns for. Arxan is a place like this. The beauty of Arxan is everlasting regardless of the changing of four seasons. Bestowed by nature, its spectacular seasonal landscape and mountains are just beyond word. Arxan is a crucial destination for the remended travelling route, China Inner Mongolia Arxan — Hailar — Manzhouli. It is also the joint of the four prairies across the SinoMongolian border, where people gravitate towards the exotic atmosphere mixed with Chinese, Russian, and Mongolia elements. As a historic site for the Yitian Battle, Arxan still embodies the spirit of Genghis Khan. Walking into Arxan, you will be amazed by a kaleidoscope of geous colors all the year round the Spring azaleas blooming red in the snow, the Summer sea wavering blue in the breeze, the Autumn leaves painted in yellow covering volcanic traces, and the Winter woods shining white on the vast alpine snowscape. Hinggan League Arxan city is situated in the far eastern area of Inner Mongolia Autonomous Region. Its full name Haren Arxan means hot holy water in the Mongolian language. Arxan is a tourism city in the northern frontier with a blend of large forest, grand prairies, vast snowfield, heaven lake cluster, thermium, as well as volcanic cluster. It is a rare and unique ecotourism base filled with healthy sunshine, clean air and unspoiled green. Nestled close to the country39。 總之，感謝所有幫助過(guò)我、給予我善意微笑的老師和同學(xué)們，在這四年里給了我莫大的幫助和關(guān)懷，讓我的青春歲月充滿(mǎn)友誼的光輝和溫暖。 另外，我也要感謝我親愛(ài)的同學(xué)朋友們，對(duì)我論文的資料來(lái)源收集與格式規(guī)范化提供了一些幫助，他們?cè)谖曳泵r(shí)提醒我要注意的論文事項(xiàng)以及需要及時(shí)完成的任務(wù)，有利于我順利完稿、交稿。這些都多虧了趙老師的辛勤指導(dǎo)和教誨。 最想感謝的是我的指導(dǎo)教師 —— 趙守娟老師，一位見(jiàn)聞廣博而又耐心細(xì)致的良師。) 新鄉(xiāng)學(xué)院本科畢業(yè)論文（設(shè)計(jì)） 24 致 謝 在論文基本定稿的時(shí)候，我心里夾雜著難以表達(dá)的傷感和欣喜，畢業(yè)論文是我即將畢業(yè)的主要任務(wù)之一，這一個(gè)任務(wù)飽含了指導(dǎo)老師的誨人不倦、朋友同學(xué)的幫助以及自己一點(diǎn)一滴的努 力。 t， y， 39。 plot(t， x， 39。 x=[ ]。*39。 x=./(1+().*exp(.*(t1980)))。*39。 b R=sum(r.^2) x1=./(1+().*exp(.*t))。)。 39。 39。 fun=inline(39。d39。c39。c/(1+(c/)*exp( 8*d))=39。c/(1+(c/)*exp(5*d))=39。)。 39。 39。 ，39。) [c ， d]=solve(39。 plot(t， x， 39。i in?1 2 1121b0 0 00 0 0nnnb b bsLss?????????，新鄉(xiāng)學(xué)院本科畢業(yè)論文（設(shè)計(jì)） 15 則稱(chēng)矩陣 L 為 Leslie 矩陣． 所以只要已知 Leslie 矩陣和初始時(shí)間種群年齡組的分布向量，就可以求出以后各時(shí)間 t 的種群年齡組的分布向量． 基于 Leslie 矩陣的人口結(jié)構(gòu) 按照每五歲一個(gè)年 齡組，我們將 099 歲分為 20 個(gè)組，即 04 歲為第一個(gè)年齡組， 59 歲為第二個(gè)年齡組， 1014 歲為第三個(gè)年齡組， ? ，把 9599 歲為第20 個(gè)年齡組，而 100 歲及 100 歲以上分為第 21 個(gè)年齡組．在這里，我們引入實(shí)數(shù) g ，并設(shè)實(shí)數(shù) g 為未來(lái)年份的生育率與現(xiàn)在種群的生育率之比，并且(,)g? ，很顯然，在平均生育率一定的情況下，我們可以通過(guò)改變 g 值來(lái)改變每個(gè)夫婦所生的孩子的個(gè)數(shù)，而且 g 的值大概等于每對(duì)夫婦所生的孩子的數(shù)除以總和生育率（總生育率是指該國(guó)家或地區(qū)的婦女在育齡期間，每個(gè)婦女平均的生育子女?dāng)?shù)），各年齡組的育齡婦女在五年內(nèi)的平均生育率向量實(shí)際上應(yīng)該為? ?1 2 21, TB g b b b? ．把 t 階段全部存活的新生兒全部劃分到 1t? 階段的第一年齡組，并設(shè)各年齡組人口在 5 年時(shí)間里的存活率向量為 ? ?Tsss 2121 , ? ，而且 t 階段第1k? 年齡組人存活到第 1t? 階段就是第 k 年齡組的人 ? ?20,2,1 ??k ，且第 21 年齡組的人五年后存活下來(lái)的仍然屬于第 21 年齡組．根