To oversee all the details yourself in person ; to be at once pilot and captain, and owner and underwriter ; to buy and sell and keep the accounts ; to read every letter received, and write or read every letter sent ; to superintend the discharge of imports night and day ; to be upon many parts of the coast almost at the same time ? often the richest freight will be discharged upon a jersey shore ; ? to be your own telegraph, unweariedly sweeping the horizon, speaking all passing vessels bound coastwise ; to keep up a steady despatch of commodities, for the supply of such a distant and exorbitant market ; to keep yourself informed of the state of the markets, prospects of war and peace everywhere, and anticipate the tendencies of trade and civilization ? taking advantage of the results of all exploring expeditions, using new passages and all improvements in navigation ; ? charts to be studied, the position of reefs and new lights and buoys to be ascertained, and ever, and ever, the logarithmic tables to be corrected, for by the error of some calculator the vessel often splits upon a rock that should have reached a friendly pier ? there is the untold fate of la prouse ; ? universal science to be kept pace with, studying the lives of all great discoverers and navigators, great adventurers and merchants, from hanno and the phoenicians down to our day ; in fine, account of stock to be taken from time to time, to know how you stand
親自照顧一切大小事務;兼任領航員與船長,業主與保險商;買進賣出又記賬;收到的信件每封都讀過,發出的信件每封都親自撰寫或審閱;日夜監督進口貨的卸落;幾乎在海岸上的許多地方,你都同時出現了似的; ? ?那裝貨最多的船總是在澤西岸上卸落的; ? ?自己還兼電報員,不知疲倦地發通訊到遠方去,和所有馳向海岸的船隻聯絡;穩當地售出貨物,供給遠方的一個無饜足的市場,既要熟悉行情,你還要明了各處的戰爭與和平的情況,預測貿易和文明的趨向; ? ?利用所有探險的成果,走最新的航道,利用一切航海技術上的進步; ? ?再要研究海圖,確定珊瑚礁和新的燈塔、
浮標的位置,而航海圖表是永遠地改而又改,因為著計算上有了一點錯誤,船隻會沖撞在一塊巖石上而至於粉碎的,不然它早該到達了一個友好的碼
頭了? ? ,此外,還有拉?貝魯斯的未知的命運; ? ?還得步步跟上字宙科學,要研究一切偉大的發現者、航海家、探險家和商人,從迦探險家飯能和腓尼基人直到現在所有這些人的一生,最後,時刻要記錄棧房中的貨物,你才知道自己處于什麼位置上。
Ellen bloom in pantomime dame s stringed mobcap, crinoline and bustle, widow twankey s blouse with muttonleg sleeves buttoned behind, grey mittens and cameo brooch, her hairplaited in a crisping net, appears over the staircase banisters, a slanted candlestick in her hand and cries out in shrill alarm
頭戴啞劇中貴婦人戴的那種下巴上系帶子的
頭巾式軟帽,身穿寡婦吐安基32那種有襯架和腰墊的裙子襯衫鈕扣釘在背後,袖子是羊腳型的戴著灰色露指長手套,配以有
浮雕的玉石胸針。
Shell and tube floating head graphite heat exchanger
浮頭列管式石墨換熱器
The connection types of supporting point of point - supporting glass curtain often adopt countersunk type or floating - head type
點式玻璃幕墻的支承點的連接方式一般採用沉
頭式或
浮頭式兩種形式。
In the end of the paper, the development of the software is introduced and an example for floating - end heat exchanger design is given to show the usefulness of the system and the effect. the method presented in this paper makes use of database to save and manage the standard sizes data and makes use of drawing libraries to save and manager the parts and assembly drawings. the theory of fixed patterns with flexible sizes is used to generate the parts and assembly drawings
文中提出的方法充分利用了數據庫技術對換熱器系列標準化尺寸數據進行有效的存儲與管理,利用圖庫對結構相同或相似的視圖進行分級分類存儲與管理,利用「死圖活尺寸」的圖形生成原理快捷地生成各種型號
浮頭式換熱器的零部件圖和裝配圖,實現了
浮頭式換熱器的輔助設計計算和自動繪圖的功能;所開發的軟體使得換熱器設計中許多實際問題得到圓滿解決,軟體開發方法具有通用性,對其它類型的換熱器輔助設計系統的開發有重要的參考價值,在該領域中將有良好的應用前景。
By stirring water with the impeller, splash water to the air evenly and widely, strengthen the pond water ' s flowing circulation, make pond water dissolve into oxygen and death of fish, shrimp and eel, raise the breeding density, quicken the growth so to achieve high and stable yields
通過葉輪攪水,把水均勻而彌散地潑向空間,加強池水流動循環,使池水溶入氧而稀釋和排出有害物質,增加水中的溶氧量,改善水質,防止魚蝦鰻
浮頭死亡,提高養殖密度,加速生長,從而達到高產穩產。
In the selective calculation module, the calculations of heat exchanger design, the analysis of pipe setting patterns are combined with the database so that the selective calculation sub - system is developed. considering the factors such as uniform flowing of the fluid, smaller inner radius of the shell, the well heat exchanging effect and saving materials, the pipe setting module is developed based on the designing data. in the module for automatically generating parts and assembly drawings, the database of pattern sizes and the drawing libraries are established according to the classifications and series
在選型計算模塊中,通過換熱器設計計算、管束組件的布管方式分析、數據庫的檢索,開發了
浮頭式換熱器輔助設計計運算元系統;在布管定型模塊中,按照確保殼程流體流動均勻、且換熱器殼體的內徑較小、管程殼程間換熱良好且節省材料的原則,根據設計計算參數建立了自動布管定型系統;在零部件圖和裝配圖自動生成模塊中,分級分類地開發了
浮頭式換熱器所有零部件圖和裝配圖的圖紙尺寸數據庫和圖庫,運用「死圖活尺寸」的開發理念,開發了圖形自動生成與管束參數化設計的集成系統。
Heat exchangers are the important apparatus for chemical industry. floating - end heat exchanger is the widly used type of the heat exchangers
換熱器是重要的化工單元操作設備,
浮頭式換熱器是換熱器的一種重要類型。
The theory of fixed patterns with flexible sizes is used and the sub - systems of automaticall generating for drawings and pipe group parameterizing design are integerated
論文最後介紹了所開發的軟體系統,並以某
浮頭式換熱器設計為例,說明了該軟體的使用過程及輔助設計的效果。
At the beginning of the paper, the characteristics of the heat exchangers and the current situation of their cad are analyzed. the design procedures are summarized and the total structure for floating - end heat exchanger cad is presented
文中首先分析了換熱器產品的特點及其輔助設計系統開發的現狀,總結了其設計流程,構建了
浮頭式換熱器輔助設計系統的總體結構。
The characteristics for this type of heat exchanger are various standards, different shapes, multi - usefulness, completed specifications and same structure but large changing range of sizes for same series. by means of developing the database and drawing libraries, parameterized designing of pipe group units, the cad system for floating - end heat exchanger was developed base on the theory of fixed patterns with flexible sizes
本文針對
浮頭式換熱器規格品種繁多、形式各異、使用廣泛、產品設計標準完善、同系列產品圖形結構相同、尺寸變化跨度大的特點,通過數據庫和圖庫的開發、管束組件的參數化設計,運用「死圖活尺寸」的開發理念,研究和開發了
浮頭式換熱器輔助設計系統。
This aerator, with high efficiency and fast speed in increasing oxygen, is able to efficiently and rapidly solve hypoxia and death of fish resulted by lack of oxygen in pond
該增氧機具有增氧速度快,增氧效率高,能有效地快速解決魚池缺氧而引起的魚類浮頭和死亡現象,是科學養魚,提高養殖密度,提高魚池單位面積產量,提高養殖經濟效益而必不可少的養殖機械。