Second, the starting and stopping behaviors under disturbed condition are analyzed and calculated by using the dynamic concentrative parameter model, which gives some advice to better prescribe refrigeration system and set theoretic foundation for carrying out automatic control of refrigeration system. third, the normal running process is analyzed and calculated by means of rational matching theory, which gives some advice on how to better understand the parameter change under steady state and the affection of inlet - parameter on evaporator. fourth, the simulation software with dynamic characteristic is designed, which can be applied to calculate thernio - parameter of cryogen, air humidity and frost thickness under different initial and boundary conditions, and to carry out dynamic simulation under conditions of dryness, wetness and frostiness, at the same time, to achieve detection and simulation at any stage from starting to stopping
本文的主要內容如下: 1 )對翅片管蒸發器結構特點進行分析,選取適當的微元控制體,就干、濕和霜工況下對每個微元分別進行傳熱傳質分析,基於
經驗關系式確定霜的有關參數,對于霜工況下的霜生長建立模型,
經適當假設,運用質量守恆、能量守恆和動量守恆方程建立適合動態模擬的蒸發器數學模型,為系統模擬奠定基礎; 2 )對蒸發在大擾動下的開、停機過程,運用動態集中參數模型進行分析和計算,為更好地描述製冷系統運行的全過程奠定基礎,同時也為製冷系統實現自動控制提供一定的理論基礎; 3 )對蒸發器正常運行過程,運用動態分佈參數和參數間定量耦合的觀點來分析和計算,為更好地了解穩態工況下各點參數的變化情況及各入口參數對蒸發器動態特性的影響即蒸發器性能對各參數變化的敏感性; 4 )編寫翅片管蒸發器動態特性模擬計算程序,可以計算不同邊界條件和初始條件下的製冷劑熱力參數、空氣溫濕度和霜
厚度分佈場,實現對翅片管蒸發器在干、濕和霜工況下的動態模擬。
Some insiders have known for a while that ms riza left on cushy terms
一些內部人士知曉麗扎以優
厚待遇離職已
經有一段時日。
Through a great deal of chemical element collections and in many ways of argument, the chemical element ( the famous spot historic monument and special product etc. in hangzhou ) that affirms the one has already can ' t represent hangzhou of now, but define deep hangzhou of the cultural bottom 蘊 with other more modern signs again much superficial with the 驕躁, and " 杭 " navigation, mean hangzhou only, in no way its idea, is because of " last years of the period of 禹, cruise the meeting 稽 to go to this, give up the sail debarkation, is a 杭, start to see in the writing ", so in addition to " 杭 " word, the manifestation of other one contents can ' t explain the whole hangzhou
經大量的元素收集及多方的論證,認定單一的元素(杭州的名勝古跡及特產等)已不能代表如今的杭州,而用其他更現代的符號來定義文化底蘊深
厚的杭州又多顯浮華與驕躁,且「杭」通航,只意為杭州,絕無它意,是因「禹末年,巡會稽至此,舍航登陸,乃名杭,始見于文字」 ,因此除「杭」字外,其他單一內涵的表現形式無法詮釋整個杭州。
Mr. porter ' s three major books on economic and corporate competitiveness are footnote - filled doorstop tomes, but roughly a half a million copies have been sold. his instructional videos sell like hotcakes
波特先生的三本主要關于
經濟與企業競爭力的書充滿註解,既重且
厚可做擋門磚,可是大約50萬冊已
經售出。他的錄像帶教材極為搶手。
Look to the streets and you see men and women quilted like duvets from their necks to their feet, and think uncharitably of those behemoth balloons outside used - car dealerships
放眼各街道你會看到男男女女都從頭到腳裹得象羽絨被,並會很不
厚道地想到了二手車
經銷點外面的龐大的氣球。
Through the experimental research, we think : the technological capacity of fiberglass asphalt macadam if weaker than asphalt macadam, however, if use elasticized capacity to solve blending technological problem. adjust the breed of fiber silk, extend its diameter, its paving capacity is still worth exploring, asphalt - rubber macadam structure lager have good deformed - become capacity and crazed - resistance capacity, small gap rate. good water - resistance capacity, good hot - stability and simple construction technology. therefore. pitch rubber spall is a good cover material which is suitable for the second class or lower whose asphalt pavement has split open because of fatigue. and is the good structural measure of preventing half - rigidity grass - roots unit shrink - rift reflecting. pave a thin layer of pitch rubber spall between asphalt - type pavement layer and half - rigidity basic level, although the cost of building is higher than paving togongbu in the middle, the construction technology, crazing - resistance and water - resistance are better than togongbu, not only could reduce greatly the reflex of half - rigidity grass - roots unit material, long then the use lifespan of pavement, but also it is possible to reduce suitably the thickness of asphalt mixture layer, though the cast of building in the early days becomes more, in the long - term opinion, it have fully important technological and economical significance
通過試驗研究認為:玻璃纖維瀝青碎石的技術性能不如瀝青碎石好,但路用彈性性能較好,如能解決拌和工藝問題,調整纖維絲的品種,增大其直徑,其路用性能仍值得探討,瀝青橡膠碎石結構層具有變形性能和抗裂性能良好,空隙率小,防水性能好,熱穩定性較好,施工工藝簡單的特點,因此,瀝青橡膠碎石是二級及二級以下公路因疲勞而開裂的瀝青路面的良好罩面材料,也是防止半剛性基層收縮裂縫反射的良好結構措施,在瀝青類路面面層和半剛性基層之間夾鋪瀝青橡膠碎石薄層,雖然造價比夾鋪土工布高,但其施工工藝,抗裂性能和防水性能均優于土工布,不僅可以大大減少半剛性基層材料的反射裂縫,延長路面使用壽命,而且可能適當減薄瀝青混合料面層的
厚度,雖然初期造價有所增加,從長遠來看,具有十分重要的技術和
經濟意義。
Secondly, the paper brings out problems which are need to be solved as emphases by analyzing objectively the plant ' s cost control actuality, the existing problems and its reasons. the analysis indicates that because of high dependence on planned economy, exterior factors seriously restricting the reasonable price of fuel, the electrovalence being made by exterior, the deficiency of its interior mechanism and the big random of cost control, the enthusiasm that the plant manages and controls cost independently is badly hurt. thirdly, aiming at these leading problems, applying the present cost control theory and the main cost control methods of electricity enterprises both home and abroad, the paper designs and evaluates its cost control project at these aspects of productive technology, management, logistic control, financial management and the manpower cost, and lodges corresponding cost control project of every tache
論文首先對當今國內外成本控制理論研究現狀和應用現狀進行了分析,包括成本性態分析、成本控制內容分析及成本控製程序與方法的分析,為論文研究打好了理論基礎;其次客觀全面地分析了永昌電廠成本控制的現狀和存在問題及其產生原因,其中包括計劃
經濟色彩濃
厚、外部因素嚴重製約燃料成本的合理配比、電價確定權在外,它嚴重挫傷企業成本管理與控制的自主積極性,也包括企業內部機制不全、成本控制的隨意性大等問題,這為本論文提出了需要重點解決的問題;然後針對永昌電廠在成本控制方面存在的主要問題,應用當今國內外成本控制的主要理論和發電企業成本控制主要方法,從生產技術、生產管理、物流控制、資金管理及人工成本等方面對永昌電廠成本控制方案進行了相對全面的設計和評價,提出相關環節的成本控制方案。
The head gamma knife center, depending on its strong technological power on neurosurgery and introduction of world leading our revolving gamma knife in 1997, is an encephalic therapy institution
頭部伽瑪刀是依託該院神
經外科雄
厚的技術力量,於1997年引進世界領先水平的our旋轉式伽瑪刀而成立的顱腦疾病治療研究機構。
With thin fabric on the window, lilac bouquets and fluffy carpet, this room provides a tranquil refuge for guests to rest their body and mind after a hectic day
薄薄的紗質窗簾緩和了忙碌的心緒,幽蘭色的花束放鬆了緊張的神經,厚厚的毛絨地毯給了人們更多的安全感,這個心靈的港灣舒適而寧靜。