第一級發動機 的英文怎麼說
中文拼音 [dìyījífādòngjī]
第一級發動機
英文
first-stage engine-
In this thesis, based on pershing ii surface to surface missile, a new kind of ballistic missile was designed with an additional rocket engine, which can be ignited twice. firstly, aerodynamic computational models of missile body and warhead which reentry with supersonic are built according to the task requirements ; secondly, the propulsion system model of missile is built whose first two stages are solid rocket engines and the third stage is liquid - solid combined rocket engine. the nozzle and the shape of the engine are designed to meet the needs of the populsion project ; thirdly, the trajectory model of the mass point is built and a wavy trajectory is designed & optimized ; finally, the ability of a missile ' s breaking through defence is analyzed
以美國潘興導彈為原型，增加可兩次點火的末級發動機，改裝成具有跳躍能力的地地彈道導彈；首先，根據任務需求，建立了導彈的氣動模型，並建立了彈頭再入時高超聲速氣動模型；其次，建立了導彈推進系統模型，前兩級採用了固體火箭發動機，第三級採用了固?液組合火箭發動機，並在總體方案要求下，對發動機噴管和外形進行了設計；第三部分，建立了導彈質點彈道模型，設計了一條跳躍式彈道，並對跳躍式彈道進行了優化設計；最後，對導彈進行了突防能力分析，從分析的結果可以看出，跳躍式彈道的突防能力比常規的拋物線彈道要強。The content of this paper is arranged as foll owing : chapter 1 introduces the concept of credit, credit risk and credit assessment, as well as the history and development of credit assessment ; chapter 2 introduces the history of ai technology, and the background of expert system and neural network. characters and disadvantages of expert system and neural network are presented respectively and the necessity of combining expert system and neural network is lightened ; chapter 3 shows the process of dealing with sample data, including the treatment of exceptional data and factor analysis, and puts forward the concrete framework of the mixed - expert credit assessment system ; chapter 4 introduces concept of object - oriented technology, and constructs object model and functional model after analyzing the whole system. it also illustrates the implementation of concrete classes by an example of rule class and the inference algorithm in the form of pseudocode ; chapter 5 introduces the structure of the whole system, the major functional models and their interfaces, and the characteristic of the system is also generalized ; chapter 6 summarizes the whole work, and points out the remaining deficiencies as well as the prospective of this method
本文具體內容安排如下：第一章介紹了信用、信用風險、信用評價的概念，回顧了信用評價的歷史、發展和現狀，並綜合各種信用評價模型，指出這些模型各自的優缺點：第二章簡單描述了人工智慧技術，著重介紹有關專家系統與神經網路的基礎知識，通過總結它們的優缺點，指出結合專家系統與神經網路構造混合型專家系統的必要性；本章還介紹了神經網路子模塊的概念，提出了混合型專家系統的一般框架與設計步驟：第三章對樣本數據進行處理，包括異常數據的剔除、因子分析等，提出了信用評價混合型專家系統的具體框架結構，介紹了系統知識庫的主要部分、基於優先級的正向推理機制的流程、以及基於事實的自動解釋機制的具體實現方法；第四章介紹了面向對象技術，進而採用面向對象對信用評價系統進行分析，建立了對象模型和功能模型，並在此基礎上，採用c + +語言以規則類為例說明系統中具體類的實現，用偽代碼的形式描述了推理的演算法；第五章描述了整個系統的結構，對系統主要功能模塊和界面進行了介紹，並總結系統的特點；第六章總結了全文，指出本文所構造系統存在的不足以及對將來的展望。In section one, we analyze the mechanism of lwi gain, and study the effects of the rabi frequency q of the driving field, the injection rates ratio rb / r ~, the exit rate r0, the decay rates ~ and rab between atomic levels, as well as 3 incoherent pump rate r on the gain without inversion, dispersion and population difference of the system. in section two, we discuss the effects of the detuning of the driving field and the probe field on the gain
在第一節中分析了無粒子數反轉激光增益產生的機制、研究了驅動場的rabi頻率、粒子注入速率比值r _ b / r _ c 、粒子退出速率r _ o 、能級間的自發衰減速率r _ （ c - b ） 、 r _ （ a - b ）和非相干泵浦速率r對增益、色散和粒子數差的影響；第二節討論了驅動場和探測場的失諧對無粒子數反轉激光增益的影響。Abstract : the safety management is one of the important content for the enterprise management on the mine. the safe civilized production can ensure production operation smoothly. once safe production has been met several unfavorable factors at transform structure in the mine enterprise, as a result, the production included plenty of passive and difficult position. if all leaders and clerks changed ideas “ the safety first and putling prevention first ”, the management work would must push forward for the development of the mine enterprise
文摘:安全管理工作是礦山企業管理的重要內容之一，安全文明生產是生產經營活動順利進行的保證，礦山企業在轉機建制中安全管理工作遇到諸多不利因素，導致安全管理工作一度出現被動與無序的局面，只要各級領導和全體職工提高認識，轉變觀念，牢固樹立「安全第一，預防為主」的思想，落實安全生產責任制，全方位開展安全生產標準化的創建，形成有效的安全文化氛圍，安全管理工作必將對礦山企業的發展起到巨大的推動作用。After the first stage burns out, it falls back to earth along a parabolic path, while the engines of the second stage fire to thrust the rocket into an earth orbit
當第一級燒毀后，沿拋物線的軌道落到地球，而第二級的發動機點火把火箭發射到地球軌道。Chapter 2 makes a positive analysis on the industry structure, kinds of tax formation and tax power division of the tertiary industry during 1994 - 2000. meanwhile, it studies the main factors of the growth of the tertiary industry in theoretical perspective. chapter 3 works in detail upon the relation and the interaction between tax and the tertiary industry growth
第一章簡介第三產業稅收制度的歷史沿革及現狀；第二章對1994 - 2000年問第三產業稅收的行業結構、稅種結構、稅級結構進行實證分析，並從定性的角度出發剖析第三產業稅收增長的主要動因；第三章通過構建第三產業稅收增長因素分解模型，從定量的角度出發，揭示第三產業稅收增長機制中的矛盾和問題及其對第三產業經濟增長產生的不利影響；第四章提出當前形勢下促進第三產業發展的稅收對策。The author paid a very specific research on the training program for high - class mechanics in xt company for months, and concluded some treatments which aim at the improvements for the staff training standards of state - owned manufacturing enterprises with some very new individual points. in the form of research, the dissertation analyses in several aspects : the first part : brief introduction of the background and the motion for the search
但是與發達國家的職業培訓體系相比，還存在著一定的差距。作者通過數月來對xt公司的高級技工培訓方案的研究，並作以實證分析，提出了改進方案。全文從以下幾個方面進行闡述：第一部分，簡要介紹了培訓研究的背景和動機。More than 30 papers were published in top - class and core magazines such as physics transaction, chinese electrical engineering transaction, power in china, apparatus and instrumental transaction and north china electric power university ( ncepu ) transaction as well as in crucial ieee conferences such as the 6th global intelligence control and automation, international conference of machine learning and cybernetics, international industrial electronics conference, among which our 16 papers has been recorded in sci and ei
2006年我中心在《物理學報》 、 《中國電機工程學報》 、 《中國電力》 、 《儀器儀表學報》 、 《華北電力大學學報》等一級刊物和核心期刊上發表，以及在第六屆全球智能控制與自動化大會、機器學習與控制論國際會議、國際工業電子學術會議等ieee重要國際會議上宣讀並發表學術論文30餘篇，其中16篇論文被國際三大檢索之sci和ei收錄。Third, based on the thorough research of the multilevel security models, integrity models and role - based access control models ( rbac ), a modified blp model ( mblp ) is designed and applied in a secure operating system developed independently. then, a well - integrated model of blp model, clark - wilson model, dte model and rbac models is proposed, leading to a prominent dynamic authorization access control model ( daacm ), which supports diverse security policies, including confidentiality, integrity and authorization
第三，在深入研究多級安全模型、完整性模型、基於角色的授權模型等基礎上，首先提出了一個修改blp模型（ mblp ）的方案，並在一個自主開發的安全操作系統中得到了應用；然後通過將blp模型、 clark - wilson模型、 dte模型、 rbac模型有機地集成應用，提升出一個支持機密性、完整性和授權等多安全策略的，可實現動態授權的訪問控制模型（ daacm ） 。分享友人