西敏斯特大學 的英文怎麼說
中文拼音 [xīmǐnsītèdàxué]
西敏斯特大學
英文
university of westminster-
According to the guidline, two nd : yag lasers have been designed and set up, one is end - pumped by lower output power ld using a selfoc micro lens, and the other is end - pumped by high output power ld using a pair of lenses are designed, and the characteristics such as output power and power stabilization of both solid - state lasers are investigated. thirdly, when an empty liquid crystal cell is inserted in the cavity of the nd : yag laser pumped by high power ld, the laser can operates in single axial mode. finally, according to the relationship between the laser output power and the longnitudinal a ld - end - pumped nd : yag laser sensor for displacement measurement has been investigated theoretically and demonstrated experimently, the results indicate that when the mean radius of pumping inside the laser cavity is far less than that of the oscilating laser mode, the exponential of the output power is a gauss function of the longitudinal positon of focused spot of ld pumping beam, both the measurement range and the sensitivity are dependent on the incident pumping power, as the incident pumping power is increased, the measurement range is enlarged and the sensitivity is improve d
本文首先介紹了ld泵浦nd ： yag激光器的發展狀況、主要特性及其應用，從四能級速率方程出發，推導了ld泵浦nd ： yag激光器的閾值、輸出功率和斜效率的表達式，並簡述了激光器的工作原理、結構型式和倍頻方法；其次，以空間相關的速率方程為基礎，提出了ld端面泵浦nd ： yag激光器的設計方法，給出了一定泵浦耦合方式下，振蕩光模尺寸、最佳輸出耦合率、泵浦光模尺寸、泵浦光焦斑位置等參數的選取依據，以此為依據，設計了自聚焦透鏡耦合小功率ld泵浦nd ： yag激光器和透鏡組耦合高功率ld泵浦nd ： yag激光器，對激光器的輸出功率和功率穩定性等特性進行了實驗研究；再次，在帶尾纖輸出的高功率ld泵浦nd ： yag激光腔內插入一隻空液晶盒，觀察到了激光器以單縱模運轉；最後，根據泵浦光焦斑端面位置對激光輸出功率的影響規律，提出了ld端面泵浦nd ： yag激光位移傳感新方法，並進行了理論和實驗研究，研究結果表明：當激光晶體內泵浦光平均光斑半徑遠小於振西安理工大學碩士學位論文蕩光束腰半徑時，激光輸出功率的自然指數與泵浦光焦斑的縱向位置成高斯變化規律，測量范圍和靈敏度依賴于泵浦功率，隨著泵浦功率的增加，測量范圍擴大，靈敏度提高，當端面泵浦功率為7 . 24w （最大輸出功率為1 . 926w ）時，激光位移傳感器的測量范圍和靈敏度分別是13 . 045mm和0 . 148mw / pm 。Newness of culture and study communication in foreign countries, astonishment and excitement when touring big ben, westminster abbey and shipping on rhine … … while what make us forget to return are plentiful kinds of museums with precious exhibits
異國他鄉文化學習交流的新奇，游覽大本鐘、西敏斯特大教堂和泛舟萊茵河的驚訝與興奮… …而最讓人流連忘返的當屬種類豐富、展品珍惜的博物館。At present, university of westminster has established itself as a very influential chinese language teaching and research base in the uk
目前，西敏斯特大學漢語專業已成為英國較有影響的漢語教學和研究基地。The two parties reach a consensus on arranging a programme for vietnam students on scholarships to study in china. november 1, the celebration of 25th anniversary of pcl scholars exchange programme, co - hosted by csc and university of westminster, is held at beijing hotel
11月1日，由國家留學基金委和英國西敏斯特大學university of westminster共同主辦的"中英pcl學者交流項目實施25周年慶祝活動"在北京飯店舉行。Pcl programme is the longest partnership that csc maintains with a british higher education institution. during the past 25 years, over 260 scholars from 25 provinces, municipalities, and autonomous regions in china have been selected to study at the university of westminster
Pcl項目是我國與英國一所高等院校合作時間最長的一個項目，實施25年來，我方共從全國25個省市自治區選派了260多名學者赴西敏斯特大學學習。分享友人