【正文】 s first auto train ready t。s travel website last year. Tourists from Shanghai are also willing to spend more, many paying 4,000 yuan ($652 ) to 6,000 yuan, to take a cruise. Xue Yifan, who returned last week from a sixday cruise trip to Japan and South Korea with her 6yearold son and parents, paid 8,000 yuan for the trip per person. She says the itinerary arranged for the guests was amazing. Life39。ll be extrapampered with two crewmembers on board to every one passenger. But let39。s getting close to three years at sea. On this cruise, we are particularly pampered: There are only 56 passengers－ and 119 crewmembers. There are usually 120 to 150 passengers on board, and most cruises are fully booked－ popular destinations such as Antarctica and the Mediterranean as much as a year ahead. Late summer timing and the challenge of booking return flights after disembarking at Kangerlussuaq have kept our group on the small side. We39。s no assigned seating, except at the wele and farewell dinners hosted by Croatian captain Denis Radja) features gourmet European fare. Lunches are expansive buffets in the restaurant－ though in good weather, many of us sit in the sun on the observation deck, where there is a small buffet as well as sandwiches and pastas made to order. I39。re promised a landing near two thermal pools with a view of passing icebergs. Those swimming suits we packed will be used after all. Each day, there is at least one lecture by an expert－ a geologist, birder, Viking scholar, botanist, anthropologist or marine biologist. These informal talks are fortably spaced between gourmet meals and free flowing wine and spirits, all of which can be enjoyed in the collegiality of the restaurant or in the cozy privacy of your cabin. The cabins are surprisingly spacious, and the butler assigned to my suite keeps the plimentary minibar stocked with my preferred beverages and snacks. He and the cabin valet will discreetly tidy up the room each day while I39。s last yellow wildflowers. We explore an outdoor museum, watch a kayak demonstration at a traditional hunting camp, enjoy an Inuit choir performance in the church, and enjoy coffee and a folk dancing at the local culture center. Nanortalik means place of polar bears in the local Inuit language, but a fanged ivory skull in the museum is the closest we39。re on the wrong day, Silver Explorer works its way as close to shore as possible before droppinganchor. Then we pull on our waterproof pants, jackets and boots, and climb singlefile intoZodiacs－ the big, motorized rubber rafts that will take us to the day39。s relative pettiness is key to our itinerary. At the moment, we are cruising overa channel 240 meters deep, but yesterday, winding through Skoldungen Fjord, we hadscooted over depths as shallow as 69 meters. You can39。s landmass into the continents we know today. There are about 50 passengers on board, most huddled among the rails at 8 am in the bright red parkas provided by the Silversea cruise line. The air temperature is 9 C－ the water temperature is12 C, expedition leader Stefan Kredel announces on a loudspeaker, just in case anybody is planning to strip off for a morning s wim. Our luxury vessel is small as cruise ships go. American TV39。s Level 6, Fonseca tells us we39。s Prince Christian Sound, named after a longago Danish royal who became King Christian VIII. In the distance, the water surface is a smooth sheet of darkgreen jade under the overcast sky. The cruise ship suddenly feels larger as we slip into the narrow passage of the sound. Bigger and bigger chunks of sea ice float by, like huge gobs of whipped cream dropped on the surface by some quirky Norse god. The sculpted forms pass so close, it39。 We are floating on top of a frozen margarita. That39。 感謝 ***同學(xué)給予我無私的幫助，他們對我所遇到的難題的解答讓我受益匪淺。 首先我要對本論文的指導(dǎo)老師 ***老師致以衷心的感謝！從論文的選題、有關(guān)資料的收集、課題的討論，到論文的 撰寫和修改，導(dǎo)師都給了我悉心的指導(dǎo)和幫助。 msb=ad_pro()。 //A/D 基準(zhǔn)斷電 . } void main() { ad_jiaozhun()。 // ad_write(0x20)。 while(ad_drdy==0)。 while(ad_drdy==0)。 } 18 void ad_jiaozhun() //初始化 A/D,校準(zhǔn)兩個(gè)通道 .在 通道一上持續(xù)工作 . { ad_init()。 //寫時(shí)鐘寄存器 ,設(shè)時(shí)鐘信號位于使用的主時(shí)鐘信號 () ad_write(0x10)。 ad_write(0x20)。 delay()。 delay()。 //復(fù)位 AD 轉(zhuǎn)換器 101 脈沖 ,40ms delay()。 } //AD 初始化復(fù)位 ,50赫茲輸出速率 ad_init() { ad_cs=0。 ad_dout=1。 //或 kk。 ad_sclk=1。 ad_sclk=0。 kk=16。 //讀通訊寄存器 ,選擇通道 1,2,并建立下一個(gè)操作位讀數(shù)據(jù)寄存器 ad_sclk=1。 while(ad_drdy==1)。 //寫設(shè)置寄存器 ,清除 FSYNC,建立增益等運(yùn)行條件 //初始化被選通道為自校準(zhǔn)模式 ,有緩沖器 } //A/D 轉(zhuǎn)換結(jié)果讀取函數(shù) . unsigned int ad_pro() { data unsigned int j,k=0。 ad_write(0x0f+ch)。 j=j3。gain=0,1,2,3(1,2,4,8...) ch 通道 gain 增益 { data unsigned char i=0x46。,準(zhǔn)備輸入數(shù)據(jù) ad_cs=1。 //送完命令置 39。 i。 ad_sclk=1。 ad_in=mandamp。 i=8。 ad_sclk=1。 while(i7000) { i++。 void delay() { data unsigned int i。 //AD7705 復(fù)位 sbit ad_drdy=P1^5。 //AD 輸入輸出 I/O sbit ad_din=P1^3。 //AD 轉(zhuǎn)換器 AD7705 硬件 I/O 定義 sbit ad_sclk=P1^0。系統(tǒng)的分析和設(shè)計(jì)是項(xiàng)很辛苦的工作，同時(shí)也是一個(gè)充滿樂趣的過程，在設(shè)計(jì)過程中，要邊學(xué)習(xí)，邊實(shí)踐，遇到新問題就不斷探索和努力即可使問題得到解決。系統(tǒng)的分析與設(shè)計(jì)過程是對學(xué)習(xí)的總結(jié)過程，更是進(jìn)一步學(xué)習(xí)和探索的過程。 （ 3） 組合性：未來稱重系統(tǒng)會大量應(yīng)用在工業(yè)計(jì)量過程和工藝流程中，其要求組合性，即測量范圍可以任意設(shè)定；硬件能夠依據(jù)一定的工作條件和環(huán)境作某些 調(diào)整；軟件能按一定的程序進(jìn)行修改和擴(kuò)展；輸入輸出數(shù)據(jù)與指令可以使用不同的語言和條形碼，并能與外部的控制和數(shù)據(jù)處理設(shè)備進(jìn)行通信。目前飛電子秤技術(shù)朝著以下方向發(fā)展 ： （ 1） 智能化：本系統(tǒng)中雖然利用單片軟件實(shí)現(xiàn)一些簡單的功能，我們可以將其與電子計(jì)算機(jī)組合，開發(fā)稱重用計(jì)算機(jī)，利用計(jì)算機(jī)功能使電子秤具有推理、判斷、自診斷、自適應(yīng)、自組織等功能。另外稍加擴(kuò)展，該電子秤還可與其它生產(chǎn)質(zhì)量管理系統(tǒng)項(xiàng)連接，具有推廣應(yīng)用價(jià)值。 價(jià)格計(jì)算 價(jià)格計(jì)算公式 S=U*Wx， S 為價(jià)格 U 為單價(jià)， Wx為實(shí)際測得重量值。 Wx 為實(shí)際重量值 Ws，滿量程重量 10000g， Ns 為 16 位二進(jìn)制值，Nx 為 AD 裝換讀取值，其量化單位為 10000/65535=。本文以 AT89C52 單片機(jī)為核心，設(shè)計(jì)一個(gè)基于單片機(jī)的數(shù)據(jù)采集系統(tǒng)，通過模擬電壓形式輸入系統(tǒng)，經(jīng) AD 7705 可以采集 2 路模擬量，精度為 16 位，并經(jīng)多次采樣，通過濾波，取得更精確的重量值。 去皮鍵 清單價(jià) 累計(jì)鍵 小數(shù)點(diǎn)？ 數(shù)字鍵？ 返回 掃描 P2 口 當(dāng)前重量送入皮