高頻轉導 的英文怎麼說
中文拼音 [gāobīnzhuǎndǎo]
高頻轉導
英文
hft-
In this study, the stem segments of new shoot with axillary buds of well - growth tetraploid black locust trees were used as explants. the effects of different basic mediums, different hormone kinds and their concentrations ratios, different sucrose concentrations on calli induction, buds differentiation and rooting in the process of establishment of high frequency regeneration system of tetraploid black locust were studied. on the base of high frequency regeneration system, the effects of various factors on transformation efficiency of badh mediated by agrobacterium tumefaciens were discussed in the light of gus histochemical assays
本實驗首先以生長良好的四倍體刺槐優株上當年生新梢的帶腋芽莖段為外植體，研究了在四倍體刺槐高頻再生體系的建立過程中不同基本培養基、不同激素濃度及其配比、不同蔗糖濃度對愈傷組織的誘導、芽的分化及生根的影響；然後在得到高頻再生體系的基礎上，通過農桿菌介導法轉化甜菜堿醛脫氫酶（ badh ）基因，以gus染色組織分析為依據探討了影響轉化效率的各種因素，建立了高效、可重復的基因轉化體系，為四倍體刺槐目的基因的導入打下了基礎。Finally, this thesis discussed these following questions : first, the algorithm of used the error image for improving the purpose of the edge detection. secondly, we have transformed the solved question of the first and the second directional derivative to frequency domain and founded they have a single formulae in frequency domain. thirdly, we have described the singular signal and the noise by using the correlations of the neighbor data after wavelet transform
最後，在傳統的邊緣檢測演算法和小波分析的邊緣檢測演算法之外，對以下幾個方面也進行了一些討論： 1 ）利用誤差圖像來提高邊緣檢測效果的演算法； 2 ）將求解任意方向的一階、二階方向導數的問題轉換到頻域中去求解，發現在頻域中它們具有簡單易用的公式，使得原來求解任意方向的一階、二階導數的比較困難的問題變得容易實現了。This thesis was divided into eight chapters, and the main results and innovations obtained here can be summarized as follows : ( 1 ) the physics model of tsrs in frequency conversion crystals has been built up firstly. based on quantum - mechanical viewpoints and the following physical processes and parameters : the two - photo interaction of light with matter, paraxial diffraction of stokes, langevin noise sources, reflection at the faces and the edges of crystals, gain coefficient, beam aperture, pulse width and fluence of 3, the physics model of tsrs in kdp and kdp crystals acting as high - fluence frequency convector and the paraxial operator maxwell - bloch - langevin equations have been built up
全文共分八章，取得的主要成果及創新點如下： （ 1 ）首次建立了諧波轉換晶體的tsrs物理模型本文根據量子力學原理，在考慮如下物理過程和參量的基礎上：光與物質的雙光子相互作用； stokes光的傍軸衍射； langevin （郎茲萬）噪聲源；晶體表面反射和端面反射；增益系數、光束口徑、脈寬和三倍頻光能量密度，推導出高通量激光在kdp和kd ~ * p諧波轉換晶體中的tsrs物理模型和空間上的近軸算符maxwell - bloch - langevin方程組。To utilize the advantages of dsp chips, the system should be computing sources economical. according to digital signal processing theory, the poly - phase fir can help reduce the workloads of the ddc / duc. therefore, adding the complex carrier mixers, the channelization system ( a method of using a single wideband facility to transmit many relatively narrow - bandwidth signals. by subdividing the frequency spectrum used in the wideband channel ) can be formed utilizing the characters of fft
為了使開發出的軟體可以適用於高速dsp器件開發，節省系統資源，課題首先從數字信號處理的理論進行分析，得出可以利用抽樣率轉換的數字濾波器的特點，即多相濾波實現數字上下變頻計算負擔的減小，之後進一步將多相濾波器與頻譜搬移部分結合，通過公式的推導，得出可利用快速傅立葉變換的特點實現多路信號的通道化發射和接收的處理模型。The dynamo runs at rull speed to drive main shaft, then the main shaft makes the emulsifying wings in emulsification grove rotate, which absorbs the liquid in its brand groove into ring groove through guide vanes on upper and lower sides of the groove. the vanes spins circularly at high speed with the main shatf as center, and the blade and emulsificaton groove cut and crush it continuously. after that. it gers squeezed by the vanes highspeed centrifugal rotation. at last, it finishes isotropt emulsification tratment within extremely short time after continuous circulating mixing
由電動機全速運轉帶動主軸，經主軸轉動乳化框槽內之乳化翼片，使其將桶槽內之液體經框槽上、下兩側之導流葉片吸入環狀框槽內，經以主軸為中心高速圓周旋轉葉片；連續使乳化翼端刀面與乳化框間極小之間系高頻率之強力切割剪斷、粉碎，再借葉片高速離心旋轉排擠，持續循環混合，以極短之時間即可完成均質乳化之處理。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 。4. according to the cefgshg, the fundamental light radius was optimized when the length of bbo crystal was constant. 5
根據所推導的高斯光束倍頻轉換效率公式，對bbo倍頻晶體在長度確定的情況下，對基頻光斑進行了優化。In this review, advances and problems on the study of agrobacterium - mediated genetic transformation of brassica, such as establishment of efficient plant regeneration system and infection method are represented
從高頻再生體系的建立、農桿菌的侵染方法、導入外源基因等方面綜述了蕓薹屬作物的遺傳轉化研究進展，並對研究中存在的再生成苗、轉化率低和篩選方法等問題進行了討論。With the development of electronic technology in the field of high - frequency and high - power, power mosfet is gradually enhancing its important status in semiconductor apparatus and is being widely applied in power converters as switch. with the increasing of the operating frequency ( > 200khz ), the energy loss caused by parasitic capacitance will affect the efficiency of power transforming in converters. especially in the applications of high frequency power supply using mosfet as main devices ( the unit of frequency is mhz ), the energy loss caused by the switch process will badly affect its efficiency
隨著電力電子技術進一步向高頻的大功率用電領域發展，功率mosfet在各種電力半導體器件中的重要地位日益顯著，使用功率mosfet作為開關器件的功率轉換電路也日益增多，但隨著器件開關頻率的提高（大於200khz ） ，由器件極間電容引起的能量損耗將會影響到功率轉換電路的能量傳輸效率，特別是在以mosfet作為開關器件的高頻感應加熱電源中（工作頻率可達兆赫） ， mosfet在開關過程中的能量損耗嚴重影響到電源的效率，因此如何減小開關器件的損耗提高高頻功率轉換線路的效率成為電力電子技術領域的重要研究課題之一。To avoid high frequency oscillation in the course of autopilot design, damping coefficient value was treated as a constraint, the rise time was taken as objective, and the other performance criteria were taken as constraints, then the robustness design problem was solved by multi - objective optimization method
摘要在導彈控制系統設計過程中，考慮了自動駕駛儀的高頻振蕩問題，將其轉化為系統的一個約束條件，同時把上升時間轉化為目標函數，其他設計指標視為約束條件，採用有約束多目標優化的方法解決了系統魯棒性設計問題。The actively and passive mode - locked fiber ring laser and two types of photonic switching, slalom ( semiconductor laser amplifier loop mirror ) and uni ( ultrafast nonlinear interferometer ) were developed. this thesis presented the principle and the requirements for the optical of frequency - shift sampling module under common conditions
研製了作為光取樣脈沖源的主動鎖模和被動鎖模光纖激光器；半導體光放大器環鏡及超高速非線性干涉儀的光子開關，並進行了頻差法光取樣、異步光取樣及基於時分光取樣的光子模數轉換的實驗研究。Based on the viewpoint of interaction between waves in plasmas, the partial differential equation that causes the spectral lines broadening has been deduced from radiation transfer equation of high - frequency electromagnetic waves in plasmas. the numerical solution has been obtained by using the fortran program we compiled. we concretely calculated the spectral lines widths of and fraunhoferx 3704 in corona, fj / a4923. 9 in dwarf nova oy car and f. / a4934 in the variable star rr lyrae
本文從等離子體波與波相互作用觀點出發，由高頻電磁波輻射轉移方程導出了引起譜線寬度變化的偏微分方程，編寫fortran程序求解偏微分方程的數值解，具體計算了日冕綠線f _ exiv 5303和夫朗禾費線3704 、矮新星oycarf _ eii 4923 . 9 、天琴rr型變星f _ ei 4934的譜線加寬值，對以上各譜線加寬中的等離子體致寬效應作了初步計算。The growth rate of inflectional instability and viscous instability also saturate similarly to the primary and nonlinearly generated disturbances. the main effect of inflectional instability mode in the final breakdown seems to interact with the disturbances having developed and thus widens the frequency spectrum to turbulent state
屬于拐點不穩定性的高頻二次不穩定模態對最後轉捩的影響主要體現在與其它擾動的相互作用，並導致出現紊流狀態寬帶頻譜。Ultrasound uses high - frequency sound waves to determine if a suspicious lump is solid or fluid. these sound waves are transmitted into the body and converted into a computerized image
超聲技術應用高頻聲波檢測可疑腫塊是固體還是液體。這些聲波被傳導入體內並翻轉回來計算機處理的影像。In order to establish the genetic transformation system of saussurea medusa maxism by agrobacterium rhizogenes, some work were done. the main results were following : 1 establishment of regeneration systems two systems of regeneration from saussurea medusa maxim were established without cold treatment. the somatic embryos were induced from callus cultured in mise for 35 days. the shoots were induced from cotyledon after cultured in misc 20 days, and from leave which were cultured in misl. the experiment showed that the carbon and glycine in the medium could help to increase the regeneration rate to 95 %
為篩選水母雪蓮代謝突變體和轉基因研究奠定了一定的基礎，陳亞瓊： m質粒介導水母雪蓮的遺傳轉化及毛狀根中決刪合成的調節p義摘要也為研究類黃酮代謝途徑的關鍵酶基因的轉化、高效表達及作用機理提供了理想的實驗體系。主要的實驗結果如下： 1水母雪蓮高頻再生體系的建立通過體細胞胚胎發生途徑和器官發生途徑，水母雪蓮（ squssureamedusamaxim ）可以在常溫下獲得再生植株。The conversion efficiency formula of the flat wave for second - harmonic generation was deduced in detail. and that of the gaussian wave for second - harmonic generation also was given in the small signal deliver
詳細推導了平面二次諧波的倍頻轉換效率公式，介紹了小信號近似下高斯光束的倍頻轉換效率公式。Recent studies have shown that the quantum coherent population trapping, electromagnetically induced transparency, index enhancement without absorption, etc. these new effects have great potential for the control of the coherence properties of a medium, the production of high frequency lasers, the information storage and high precision measurements
最近的研究表明，原子相干產生很多新的效應，如相干布居捕獲、無反轉激光、折射率增強、電磁誘導透明、電磁誘導吸收等。這些新效應對光學介質相干性質的控制、高頻激光的產生、光信息存儲和高度測量等方面具有巨大的應用前景。Recent studies have shown that the quantum coherence and interference have led to a lot of new effects such as coherent population trapping, electromagnetically induced transparency, index enhancement without absorption, etc. these new effects have great potential for the control of the coherence properties of a medium, the production of high frequency lasers, the information storage and high precision measurements
最近的研究表明，原子相干產生許多新效應，如相干布居捕獲、無反轉激光、電磁誘導透明、折射率增強等。這些新效應對光學介質相干性質的控制、高頻激光的產生、光信息存儲和高度測量等方面具有巨大的應用前景。The common mode voltage has high abrupt transformation rate because of the fast switching devices, whose dv / dt can exceed 6000 v / us. under so high dv / dt, the oil film acts as a capacitor and provides a charging mechanism for rotor shaft voltage buildup
由於變頻器的高開關頻率，導致共模電壓具有很高的電壓變化率，其dv dt可以達到6000v us以上，在如此高的電壓變化率下，潤滑油膜充當了電容的作用對轉軸進行充電，形成軸電壓。Based on the plant expression vector of pcambia1300 - hbmp - 3m and pcambial 301 - hbmp - 3 constructed, we set up the system of high frequency regeneration and transformation of tomato cotyledons. the hbmp - 3m gene and hbmp - 3 gene were respectively transformed into tomato and tobacco by transfection of agrobacterium tumefaciens. and the transgentic plants were detected. the main results are as follows : l. the plasmid pcambial300 - hbmp - 3m carried hbmp - 3m gene and pcambia - 1301 - hbmp - 3 carried hbmp - 3 gene were respectively transferred into agrobacterium tumefaciens by electroporation
本試驗是在已經構建好的植物表達載體pcambia1300 - hbmp - 3m和pcambia1301 - hbmp - 3載體的基礎上，建立番茄子葉的高頻率再生體系和番茄子葉的高頻遺傳轉化系統，利用根癌農桿菌介導的方法，將人骨形成蛋白- 3成熟肽（ hbmp - 3m ）基因和人骨形成蛋白- 3 （ hbmp - 3 ）全長基因分別導入番茄和煙草，並對轉基因植株進行了檢測。分享友人