等密度圓 的英文怎麼說
中文拼音 [děngmìdùyuán]
等密度圓
英文
equidensities-
Charles has presented an analysis of the concentric flow of long cylindrical capsules carried in an equidensity liquid in laminar motion.
查爾斯已對載運于等密度液體中，以層流運動的長圓柱形包囊的同心流動提出了分析。With the use of finite method we have developed computer simulation software for vacuum microtriodes with wedge - shaped and cone - shaped cathode on the basis of stduying deeply the field emission theory of vacuum microelectronics. the software included field section, grid point numbering, and the calculation of electric currents, transconductance and cathode capacitance, moreover, it can simulate the properties of vacuum microeletronic with variant structures and sizes. the relationship was studied and simulated among electic properties and device structures, sizes and cathode materials etc. the optimized design of vacuum microtiode was proposed
本文在深入研究真空微電子器件場致發射理論的基礎上，根據圓錐形、楔形陰極真空微電子三極體的不同特點，分別建立了物理和數學模型，在考慮空間電荷密度影響的前提下，以有限元法為基礎採用迭代的方法計算出真空微電子三極體內的電勢分佈情況，繪制出了等勢線、電子軌跡線，並得到了器件電學性能隨幾何參數的變化情況。We can get electron density with the calculated phase and some common model formula ( such as sphere and cone ) in the wake of hypervelocity projectiles
由計算出的相位並根據彈道靶尾跡的一些常用模型（包括圓球體、鈍錐體等）公式，把相位轉化為尾跡的電子密度。Consisting of the protracting graph of hydrogen - like atom ' s angle distributing, computer simulation of the symmetry of molecular orbital and chemical reaction mechanism, showing the molecular point group and symmetry element, computer simulation of molecular vibration, bravias ' s crystal lattice and their transforming, extracting of plane periodic lattice, extracting of solid periodic lattice, close packing of isometrical pellet and the structure of simple mental substance, close packing of unequal pellet and crystal structure of representative ionic crystal, computer simulation of phase analysis by x - ray diffraction
內容包括類氫原子角度分布圖的繪制，分子軌道對稱性和反應機理的微機模擬，分子點群和對稱元素顯示，分子振動運動的微機模擬，布拉維晶格和晶格轉化，平面點陣抽取，立體點陣抽取，等徑網球的密堆積和金屬單質結構，不等徑圓球密堆積和典型離子晶體結構， x射線多晶衍射的微機模擬十個子模塊。The sea1 ring with complex section shape cafl be treated as a combined body made of several individual cy1 inders with di fferent dimensions. by app1ying the method used in the " edge prob1 em " of the fnoment theory of she11, the deformat ion - - - radia1 disp1acement and rotation at the two edges of each individual
應用殼體力矩理論中求解邊緣問題的方法，將密封環分解為多個等厚度、截面為單一矩形的筒體，對每一圓筒進行分析並運用殼體力矩理論求出其兩個邊緣在外載荷作用下的邊緣變形值? ?徑向位移及轉角。Firstly, we generalize and analyze the advantages and present research of elliptic curve cryptography ; secondly, we study the basic theory of the ecc ; thirdly, we illustrate the safety of the ecc and discuss the elliptic curve key agreement scheme, elliptic curve encryption scheme and elliptic curve digital signature algorithm ; fourthly, we study fast algorithms of the multiplication and inversion multiplication of the element of in the underlying finite field f2m whose characteristic is two represented by the two basis of optimal normal basis and polynomial basis. we make improvements to the fast algorithm of the polynomial basis multiplication by hankerson and base on the experiments, we describe the properties and compare the advantages of the multiplication and inversion multiplication of the elements in f2m field under optimal normal bases and polynomial basis. results concluding from the study car be used as references in the realization of the elliptic curve cryptosystem ; fifthly, we overview the current fast algorithm of point multiplication, improve the fix base point comb algorithm, advance the speed of the whole system and remark the advantages and disadvantages of the popular algorithms based upon the experimental datas ; sixthly we realize the algorithm library of elliptic curve cryptography based on the f2m. only change slightly in our algorithm library can we realize the ecdh, eces, ecdsa based onf2m of anysize ; seventhly, we realize the ecc on two secure elliptic curves, including ecdh, eces, ecdsa
本文首先介紹並分析了橢圓曲線密碼體制的優點及研究現狀；其次研究了橢圓曲線密碼體制的基本理論；第三，分析了橢圓曲線密碼的安全性並介紹了密鑰共享，加密，數字簽名等橢圓曲線密碼體制；第四，深入研究了特徵為2的有限域f _ 2m中的元素在多項式基和最優正規基表示下的乘法運算和乘法逆運算的快速演算法，並對hankerson等人提出的多項式基下的乘法運算的快速演算法作了改進，而且在實驗的基礎上不僅分析研究了f _ 2m域中元素在多項式基和最優正規基表示下的乘法和乘法逆運算的性能，還對這兩種基表示下的f _ 2m域中元素運算效率的優劣作了比較和研究，所得的結論可供在實現橢圓曲線密碼體制時參考；第五，研究了目前流行的計算橢圓曲線標量乘法的快速演算法，同時改進了固定基點梳形法，提高了整個系統的速度，並在實驗的基礎上分析研究了流行演算法的優劣；第六，實現了基於f _ 2m的橢圓曲線密碼體制的演算法庫，在我們的演算法庫中只需稍微改變便能實現基於任意尺寸的f _ 2m上的ecdh ， eces ， ecdsa等橢圓曲線密碼體制；第七，實現了兩條安全橢圓曲線上的橢圓曲線密碼體制，包括ecdh ， eces ， ecdsa 。Contact pressure, hysteresis and no - even pressure ratio of no - gradual - enlargement finger seal under different length ratio and root circle of no - gradual - enlargement finger seal are constructed and analyzed, rules are summarized
本文對非漸擴形結構指尖密封在不同寬度比和根圓外徑下的接觸壓力、遲滯率及偏載率等特性進行了作圖、分析，得出了相應的規律。Laizhou guangyun machinery co., ltd. laizhou guangyun machinery co., ltd, an private enterprise which intergrates science, manufacture and trade. it covers an area of 10000m2, has 100 staffs. with advanced and exactitude exam equipments and modern management systerm, we specialized in manufacturing wood - working machine, such as log splitter, circular saw ls400, vertical log splitter, planer thicknesser and so on. the log splitter which model is 52cm, 37cm, and the force can be reached 4t, 5t, 6t ; cutting machine includes metal cutting band saw, marble cutting machine besides dust - collector, multi - function mixer, motor, shieding pressure - pump and so on. the product is sold all over the whole country, and exported to europe, america, east - north asia ect. most products have been certified successively by international safety seanclards which are european economic community ce, germany gs ect.
公司員工100餘人，佔地面積10000m2 ，擁有先進精密的製造檢測設備和現代化的科學管理制度，專業生產木工機械： ls - 370 ls - 520型號的劈木機400圓木鋸立式劈木機木工刨床等，切割機械：金屬帶鋸機理石切割機等，以及集塵器攪拌機電機屏蔽增壓泵等，產品遠銷全國各地並出口歐美東南亞等20多個國家和地區。The company has the advanced precision casting, the machine - finishing equipment and the check - out facility, including : disk wax mould machine, moistening slurry machine, intermediate frequency melting furnaces, cnc tooling machine, spectrometer, metallurgical microscope, hardness testing machine, computer material test machine. and so on
公司擁有先進的精密鑄造、機械加工設備及檢測設備，其中包括：雙工位射蠟機、圓盤射蠟機、沾漿機、中頻熔化電爐，光譜分析儀、金相顯微鏡、硬度試驗機、電腦萬能材料試驗機， cnc數控車床、普通鉆銑床及閥門管件殼體、密封試驗機等。Ni - cd cylindrical cell has the properties of small internal resistance, long service life, resistant to over charge and discharge, low self discharge, wide operation temperature range ( - 20 + 40 ) and high reliability. they are suitable for high rate discharge and widely used in the fields of electrical tools, railway trains, lighting, fire prevention and military
鎘鎳圓柱密封堿性蓄電池具有內阻小，使用壽命長，耐過充過放電，自放電小，使用溫度范圍寬（ - 20 + 40 ） 、可靠性高等特點，適用高倍率（大功率）放電使用，廣泛應用於電動工具、列尾電源、照明、消防、儀器儀表以及軍事領域。There is a closely relationship between the inductance and some problems such as magnetic energy and interaction between coils. so how to calculate rapidly, expediently and precisely the inductance of the coil is an important problem
磁場能量和線圈之間的作用力等問題都與電感密切相關，因此如何快速、簡便、高精度計算空心圓柱線圈的電感就成為了一個重要的問題。For example, digital signature, identity distinguish are both the new technology and application derived from the cryptography. ecc is the one of the known public crypto methods that provide the best strength - per - bit. with the deeper application of ic card in the field of finance and telecom, the ecc crypto system will not only upgrade the application level of ic card, but also open up more application fields
橢圓曲線密碼體制（ ellipticcurvecryptosystem ? ecc ）是目前已知的所有公鑰密碼體制中能夠提供最高比特強度（ strength - per - bit ）的一種公鑰加密體制，而智能卡已廣泛用於金融、電信等領域，利用橢圓曲線密碼體制不僅將大大提高智能卡的應用水平而且還將大大拓寬智能卡的應用領域。Having great difference with the tradition structure, its outline is no - gradual - enlargement. the reason of rotator the key point coordinate and restriction, origin of the new coordinate system after transform, the angle of the rotator. transform of the key point between the new and old coordinate system, the rotator angle of coordinate system in ansys during the fem model come into being
本文討論了非漸擴形結構指尖密封曲梁關鍵點坐標旋轉的原因、旋轉的約束條件，旋轉后新坐標系圓心坐標的獲得、旋轉角度大小的確定、曲梁型線關鍵點坐標在新舊坐標系之間的轉換及在ansys中建立有限元模型時坐標系旋轉的原因及角度大小的確定等問題。Through the analyses of electromagnetic system of configuration of hollow metal cylinder by electromagnetic vector potential, an eddy current field math model is built by triangle cell, this article has researched power frequency to eddy current density, permeation depth and the effect of skin effect
文中通過對一個空心金屬圓筒結構的電磁系統進行分析，以電磁場矢量位有限元法為基礎對磁場強度、渦流密度進行了計算求解，採用三角形單元建立了渦流場數學模型，研究了電源頻率對渦流密度、透入深度及集膚效應等場量的作用影響。Precision copper sphere grinders, super - precision copper sphere wrapping machines, copper sphere polishing machines, automatic ball inspectors, laser measurement devices, surface roughness machines, perfect circle measurement machines, digital scopes, etc
精密鋼球研磨機，超精密鋼球lapping machine ，鋼球polishing machine ，自動球檢查器，激光測定機，表面打磨機，正圓度測定機，電子觀測器等Experiment shows, as the optimization of this paper, the speech and security of the elliptic curve cryptosystem is improved in a certain extent, this makes it can adapt to resource limited enviorment such as vpn 、 wireless net and smat cards more
實驗證明，本文的優化工作，使橢圓曲線密碼系統的運行效率和安全性能在一定程度上得到了提高，從而使它更適用於vpn 、無線網路、智能卡等資源受限的應用環境。This scheme is based on the elliptic curve discrete logarithm, which is one of the mathematic puzzles. compared with other cipher systems, it has shorter length of secret key and grouping in the same security intensity
該體制是建立在橢圓曲線離散對數問題這一數學難題之上的，和其它密碼體制相比較而言在同等安全強度下具有小得多的秘鑰長度及分組長度。Finding economical packing of circles in the euclidean plane is a widely investigated area of the theory of packing and covering. the simplest problem of this kind is to find the best arrangement of congruent discs in the plane
關于圓盤的填充問題的一個重要猜想是：在全等圓盤的填充中，密度最大填充可由正六邊形阿基米德鑲嵌中的內圓得到，這一猜想直到本世紀初才得以證明。3. more, the investigation of wave propagation characteristic in round waveguide filled periodically changeful plasma in density is done, by numerical calculation, to analyze the effect on the propagation characteristic when background plasma density and the amplitude of plasma density change
3 .研究了電磁波在填充密度周期變化等離子體金屬圓波導中的傳輸特性，通過數值計算分些了不同等離子體密度和背景密度情況下對波的傳播特性的影響First, we introduce the basic theory, which is useful to density measurement, namely, transmission - line theory, its content consist of transmission - line equivalent circuit 、 smith chart 、 impedance matching and microwave network technology. the on - line density measurement technology with microwave has been narrated as a key part
首先，分析了微波密度在線測量技術的理論基礎- -傳輸線理論，其內容包括將用於諧振腔設計的傳輸線等效電路、施密斯圓圖以及阻抗匹配和微波網路等多方面的技術。分享友人