Based on the invariance of maximum likelihood estimation, the sufficient and necessary condition under which the maximum likelihood estimation has invariance for the parameters are given, then it uses this conclusion to calculate the maximum likelihood estimation of σ^2 and ρ for bivariate normal distribution.

根據(jù)參數(shù)極大似然估計不變性原則欧美一级AA大片免费看视频人，給出在一定條件下極大似然估計具有不變性的充分必要條件九九色无码精品网，并利用該結(jié)論計算了二元正態(tài)分布Z=的未知參數(shù)σ^2和ρ的極大似然估計值。

In order to deeply analyze the distribution of maximum tensile strain during asphalt surface for Semi-rigid base asphalt pavement and compound base asphalt pavement , two types of typical structure were chosen, taking the Shell designing software BISAR 3.0 as calculation tool, considering two kinds interface contact condition of complete continuousness and not incomplete continuousness, then a comprehensive analysis was made on the maximum tensile strain of every structure on the basis different interface contact condition.

摘 要：為深入分析半剛性基層瀝青路面和復(fù)合式基層瀝青路面面層內(nèi)的最大拉應(yīng)變的規(guī)律A黄色网站在线播放，選取兩類瀝青路面的典型結(jié)構(gòu)性感带AV电影在线免费观看，采用殼牌設(shè)計軟件 BISAR 3.0為計算工具，考慮層間完全連續(xù)狀態(tài)以及不完全連續(xù)兩種狀態(tài)日本电影黄色，對各結(jié)構(gòu)在不同的層間結(jié)合條件下瀝青層最大拉應(yīng)變進(jìn)行了比較和分析日韩精品永久免费视频。

The result shows that, compared with the plate with uniform thickness under the same condition, the maximum deflection of the simply supported square plate decreases by 44.66%, and the maximum deflection of the fixed square plate decreases by 75.63%.

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Studied present measuring methods" advantages and disadvantages, and presented the necessity and importance of researching propellant transient heat transfer.2.according to 130 and aeronautic 90 rocket projectiles" structure, analysed and acquired physical and mathematical models for propellant transient heat transfer, also designed propellant temperature field simulation units for test.3.acquired discrete transient heat balance equation and temperature calculation program, and gave contrasting curves between experimental temperature values and program calculating temperature values as well as maximum errors and average square root errors between them.4.by programs based on the first class boundary condition, worked out temperature distribution in propellant temperature field simulation units at different time, analysed temperature field distribution law and main elements affecting heat transfer, acquired propellant mass weighted average temperature and one at the half position of propellant maximum thickness as well as maximum errors and average square root errors between them.5.established transient heat transfer mathematical model and temperature calculation program for the third class boundary condition, drew contrasting curves between temperature experimental values and calculation values and gave maximum errors and average square root errors between them, got temperature distribution in the simulation unit at different time and main elements affecting heat conduction, figured out propellant mass weighted average temperature and one at the half position of propellant maximum thickness as well as maximum errors and average square root errors between them.

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ABSTRACT Aiming at problems of trans-vector controller in a vehicle-carried induction motor such as variable rotor and stator resistance following motor temperature, and their inductance varying with flux saturation degrees. Firstly, CSI and VSI are introduced, for CSI, it can hold the advantages both FOC and DTC using stator flux directional, PI parameter and simulation are also introduced. Secondly, equations of IM in the synchronous rotary frame and its static counterpart, as figuring in the saturation condition of magnetic field, are dealt in this paper and the simulation results are presented. Thereafter, the parameter designing of PI trans-vector controller is processed, which features the non-linear model. In practical realization, as neglecting the dynamical change of motor inductance, this paper employs online modification of inductance parameters, according to the flux saturation, then transforms the non-linear equations into linear ones, and so compacts the structure of controller. Thirdly, in view of the maximum torque output is extraordinary requisite when Electrical Vehicle start up, accelerate, and overtake, this paper issues the maximum torque when both inverter and battery capacity is corporeally definite. Fourthly, on-line differentiating and analyzing both rotor's time constants and its flux by using the expanding order reduction and discrete Kalman filter equation are fathomed, in order to realize high-performance trans-vector algorithm, and also the simulation results are presented. Fifthly, the close-loop regenerative brake system, when the EV's torque is set constant, is deduced; at the same time, unification of electric drive model and brake model is executed. Combined with maximum charge current demands, the mathematical model for online yielding torque as a demand.

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The theoretical maximum reductions under the condition of all combinations of the parameters are obtained,which is verified by the experiments,based on the maximum reduction criterion and the optimism method.

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The analysis of experimental data was used to research the influence of high speed rotation on maximum thrust and maximum pressure of motor, and the decreasing rule of equivalent nozzle throat area in high speed rotating condition.

通過對試驗數(shù)據(jù)的分析和處理研究了高速旋轉(zhuǎn)對發(fā)動機最大推力屌屄黄色视频、最大壓強的影響国产特级毛片无码专区，以及在高速旋轉(zhuǎn)條件下噴管等效喉部面積的減小規(guī)律，運用零維內(nèi)彈道計算模型擬合出了動態(tài)燃速隨裝藥燃面相對半徑和轉(zhuǎn)速變化的經(jīng)驗公式欧美日本一道本免费三区。

Based on theory of fuzzy sets and method of confirming index weight in AHP model, we establish respectively the quality comprehensively evaluating fuzzy models of the condition monitoring system, condition monitoring and analysing system, condition monitoring and analysing and fault diagnostic system of large rotating machines. We propose and establish the calculating formulas to assess the confidence level about application of the maximum subordinative rule.

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The activitys of Super Oxide Dismutase, peroxidase and Multiple Displacement Amplification of Ceratophyllum demersum L raised rapidly in the late of experiment, and the maximum value of MDA of Ceratophyllum demersum L in the eutrophic condition was 5 time higher than that in the medium nutritional condition, implied that Ceratophyllum demersum L has been stressed in the middle nutritional condition.

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Base Station type Software versionTypes of carrier frequency board adoptedTypes of combiner adoptedWhether had obtained the network license or notIndoor type or outdoor type Whether the master port is separated from the remote-port The maximum carrier frequency capacity of single cabinet The maximum supportable sector numbers of single cabinetWhether it is dual-carrier frequency board or notMust it be paired configuration if it's dual-carrier frequency board (namely, the type of single carrier frequency station could only configure the dual-carrier frequency on hardware) The maximum achievable configuration of a single station of the single cabinetReceiver sensitivity The maximum expand capacity of a single base station (the maximum number of TRX in configuration / the number of cabinets which is required)(fill in according with the three sectors) Top box transmitted power (given separately a grade one combine and a grade two combine) The maximum output power of amplifier (voice, a single logical carrier frequency) The maximum output power of amplifier (EGPRS, a single logical carrier frequency)Whether it has tower-interfaceWhether it has built-in lightning protectionWhether it support the ultra-long cover / whether it need for software support (give simple description that how hardware and software could achieve this) The supporting condition of EGSM (it should be supported including by the carrier frequency, combiner) Dual-band carrier wave (whether it supports the mixed use of 900 M/1800M in the same cabinet) The commonality of duplicate parts Whether it can built-in transmission unitThe single cabinet size (high × width × deep) Installation method Whether it can place against the wallThe basic frame full-configured weight and the supportable number of carrier frequencyThe expansion frame full-configured weight and the supportable number of carrier frequency

基站型號軟件版本號采用載頻板型號采用合路器型號是否已取得入網(wǎng)許可室內(nèi)型or室外型是否是主遠(yuǎn)端分離單機柜最大載頻容量單機柜最大支持的扇區(qū)數(shù)是否是雙載頻板如是雙載頻板中文字幕老熟女一区二区，是否必須成對配置(即單載頻站型只能硬件配置雙載頻)單機柜可達(dá)到的單站最大配置接收機靈敏度單基站最大擴展能力(最大配置TRX數(shù)/需機柜數(shù))(按3扇區(qū)填寫)機頂發(fā)射功率(分別給出一級合路與兩級合路)功放最大輸出功率功放最大輸出功率(EGPRS艹逼黄片，單個邏輯載頻)有無塔放接口有無內(nèi)置避雷裝置是否支持超遠(yuǎn)覆蓋/是否需要軟件支持(簡單描述軟硬件如何實現(xiàn))EGSM支持情況(包括載頻欧美电影A片一区二区、合路器均應(yīng)支持)雙頻段載波（是否支持900M/1800M在同一機柜內(nèi)混合使用）備件通用性是否可以內(nèi)置傳輸單元單機柜尺寸安裝方式可否靠墻放置基本架滿配重量及支持載頻數(shù)擴容架滿配重量及支持載頻數(shù)是否支持基本架與擴容架跨扇區(qū)滿配功耗滿配時重量供電方式機柜進(jìn)出線方式合路器損耗合路能力：幾合一單扇區(qū)最大支持幾載頻合路到一副天線/采用幾個合路器單扇區(qū)載頻達(dá)到需要增加一副天線時，是否支持兩級合路換以不增加天線如兩級合路插損為是否支持基帶跳頻和合成跳頻每單個合路器在從低載頻數(shù)向高載頻數(shù)擴容時无码精品A∨在线观看十八禁国产，是否還需要增加硬件可用性指標(biāo)MTBFMTTR系統(tǒng)中斷服務(wù)時間硬件是否支持EGPRS本次報價軟件版本號開始支持EGPRS的軟件版本號其他特點注： 1 應(yīng)分別填寫出來按照本次報價要求所采用的全部BTS型號和采用的合路器型號 2 列出本報價要求的全部室外型基站與高功放單元