Aim : to analyze the mechanism, thermadynamic theoretical basis, dynamic mechanism and influencing factors of thermally induced phase separation ( tips ) in order to completely grasp the factors affecting the size, distribution and form of pores, so that the adjusted range of pore can be widened and the preparation of porous membrane can be repeated and controlled. methods : considering from the structural characteristics of tissue engineered materials, the methods of preparing porous membrane using tips technique, the hermadynamic theoretical basis, dynamic mechanism and influencing factors were analyzed, the problems and investigative directions in the future were also analyzed. tips technique is a process of phase separation of polymer homogenous solution under quenching, and it is suitable for diameter and structural form of the micropore materials prepared using tips are closely correlated with the kind and dispensing proportion of polymer attrnuant, polymer concentration and polymer molecular mass, etc. conducted, including determination of polymer - solvent system phase diagram, study of form and appearance of porous membrane of different thickness, study of form and appearance of porous membrane prepared with systems of different x, which is the parameter of polymer - solvent interaction
目的:分析熱致相分離成膜過程的機理、熱力學理論基礎、動力學機制以及影響因素,以便充分掌握影響孔度大小、分佈、形態的因素,使孔度調控范圍得以拓寬,使多孔膜的制備能重復可控.方法:從組織工程材料結構特點出發,分析熱致相分離聚合物多孔膜的制備方法及該法成膜的熱力學理論基礎、動力學機制以及影響因素.並分析實驗中存在的問題及今後的研究方向.結果:以熱致相分離法可制備聚合物多孔膜.熱致相分離法制備多孔膜是高聚物均相溶液在淬冷條件下發生相分離的過程,它適用於上臨界共溶溫度型聚合物一稀釋劑二元體系.熱致相分離法成膜的過程,可以認為是旋
節線機理佔主導地位.熱致相分離法制備的微孔材料,其孔隙率、孔徑大小、結構形態與聚合物稀釋劑的種類、組成配比、聚合物濃度、聚合物分子量等因素密切相關.結論:可採用熱致相分離技術制備多孔膜,通過改變不同的成膜條件可獲得一系列不同孔徑尺寸和孔徑分佈的多孔膜材料.對熱致相分離成膜過程中聚合物-溶劑體系的相圖測定,不同厚度的多孔膜形貌研究,不同x (聚合物-溶劑相互作用參數)體系所制備的多孔膜形貌等需深人研究
To manage cpu resources, we provide a set of thread pools that can be tuned to balance the resources available to inbound web, ejb, and connector requests or for requests generated by the server itself, such as transaction rollback
為了管理cpu資源,我們提供了一套
線程池。通過調
節線程池,可以均衡對入站web 、 ejb和連接器請求或者由服務器本身生成的請求(比如事務回滾)可用的資源。
Many advantages of the controller are proven by simulation, such as modulating power flow of transmission line and voltage of node, maintaining the voltage stability of capacitance ' s dc side, stabilizing system ' s power - angle character and good dynamic characteristic
通過簡單系統的暫態模擬表明,該控制器在調
節線路潮流和
節點電壓、維持直流側電容電壓穩定以及系統的功角穩定方面有良好的效果,而且具有良好的動態品質和調
節效果。
The unified power flow controller ( upfc ) is one of the most enterprising realizations of the idea of flexible ac transmission system ( facts ). having the ability of controlling most of the basic power system parameters, upfc can flexibly adjust the real and reactive power through the transmission line, damp the oscillation, and enhance the stability of power system and so on
統一潮流控制器( upfc )是靈活交流輸電系統中最有代表性的成員,具備控制多種電力系統參數的能力,因而可以靈活地調
節線路有功和無功功率、阻尼系統振蕩、增強電力系統的穩定性和提高輸電
線路的傳輸極限。
Industrial - process control valves - part 6 : mounting details for attachment of positioners to control valves - section 1 : positioner mounting on linear actuators
工業過程式控制制閥.第6部分:定位器聯接到控制閥執行機構的安裝細
節.第1
節:
線型執行機構上定位器的安裝
Pitch - line runout
節線跳動
V - and ribbed belt - dynamic test to determine pitch zone location
節線位置的動態測定
V - and ribbed belt - dynamic test to determine. pitch zone location
V帶和多楔帶傳動-
節線位置的動態測定
The determination of the cloud point of pu - sio2, pes - sio2 suspensions was obtained by titration. the results showed that the addition of si02 with a high specific surface made polymer chains adsorbed at the surface, influenced the phase behavior of suspensions, shifted the bimodal to lower nonsolvent concentrations, and the water tolerance became bad
實驗證明,具有高比表面積、多孔性的sio _ 2對pu 、 pes鑄膜液的相行為有較大影響,隨著sio _ 2加入,雙
節線向聚合物-溶劑軸移動,均相區變小,分相區變大,分相時需要非溶劑的量變小,鑄膜液的耐水性變差。
Music is divided into equal parts called measures a bar line divides one measure from another
音樂被區分相等部份為稱( 「小
節線」每一小
節的豎
線) (從一小
節到另一小
節之間) 。
A double bar line consists of two vertical lines through the staff or system to indicate the end of a section or the end of a piece of music
雙小
節線由兩條與五
線譜或譜表垂直的豎
線組成,表明一個段落或整個音樂作品的結束。
The plot clues and narrative methods in dream of the red chamber
的情節線索和敘事手法