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。
The differences of the various schools of thoughts and their exponents during the period from pre - qin times to the early years of the han dynast do not lie in their advocacies, for they are all autocracism affirmers ; nor do they lie in their historical conditions, for they all regard that autocracism should be conducted under any historical conditions, i. e. they are consistent autocracism supporters beyond history
摘要中國諸子百家之不同,不在於是否主張專制,因為他們都是肯定專制的專制主義論者;
也不在於主張在何種歷史條件下應該專制,因為他們都認為專制在任何歷史條件下都是應該的,他們都是永
恆的超歷史的專制主義論者。
Similarly, in the eternal life of a human being, of a being not entirely a human being, of a sentient being, there are many sections for that reason also. but, in reality, it is a long and endless chain. as we go through our present life, there is also past and future
同樣,永
恆的生命,不一定指人而已,任何眾生
也一樣,其生命由許多部分組成,它其實是無限延伸的線條,在我們過今生時
也有過去和未來,因為根本沒有什麼時間空間,我們選擇時間和空間只是為了做人,然後可以做我們現在想做的事。
We shared with them master s love, telling them that material help could be very limited. it was more important to keep in mind master s reminder about the ephemerality of this world and that only the heavenly kingdom is forever safe
我們分享給他們師父的愛心,並告訴他們,物質的幫助
也許有限,但師父更重要的是要提醒我們世界無常,唯有天國才是永
恆安全的地方。
The glomerular filtration rate remains relatively constant.
腎小球濾過率
也能保持
恆定。
Being and non - being, difficult and easy, long and short, high and low, voice and sound, back and forth, they always come in pairs
有無相生,難易相成,長短相形,高下相盈,音聲相和,前後相隨,
恆也。
I still believe someday you and me will find ourselves in love again. i had dream someday you and me will find our own forever love
流寞,我仍然相信,我們可以在愛情世界里抵達永
恆。
也請你不要放棄,握緊我的手,不要再放開。
British physicist who established the mechanical theory of heat and discovered the first law of thermodynamics
很明顯,冷凍機是一種物理系統,因此它不僅必須遵從第一定律(能量定
恆) ,
也必須遵從熱力學的第二定律。
Clearly, a refrigerator, which is a physical system must obey not only the first law ( energy conservation ) but the second law of thermodynamics as well
很明顯,冷凍機是一種物理系統,因此它不僅必須遵從第一定律(能量定
恆) ,
也必須遵從熱力學的第二定律。
So the background of the book of ruth is a horrible picture of a nation that has forgotten their god, and bethlehem is a town that is typical of the state of the nation
所以路得記的背景是以色列人忘記了神的糟糕的景象。伯利
恆也是這個國家典型的城市。
To see a world in a grain sand. and a heaven in a wild flower. hold infinity in the palm of your hand. and eternity in an hour
從一粒沙子看到一個世界,從一朵野花看到一個天堂,把握在你手心分階段的就是無限,永
恆也就消融於一個時辰。
And a heaven in a wild fllower, hold infinity in the palm of your hand, and eternity in an hour
從一粒沙子看到一個世界,從一朵野花看到一個天堂,把握在你手心裏的就是無限,永
恆也就消融於一個時辰。
To see a world in a grain of sand, and a heaven in a wild flower, hold infinity in the palm of your hand, and eternity in an hour
從一粒沙子看到一個世界,從一朵野花看到一個天堂,把握在你手心裏的就是無限,永恆也就消融於一個時辰。