通帶利用系數 的英文怎麼說
中文拼音 [tōngdàilìyòngxìshǔ]
通帶利用系數
英文
pass band utilization factor-
For a class of quadratic finite element diseretization systems of an elliptic boundary problem with jump coefficients under the unstructured quadrilateral grids, we are concerned with two kinds of quadratic lagrangian finite element equations, by analyzing the relationship between the linear finite element and quadratic finite element basis functions, a hew amg method is designed
摘要針對一類帶間斷系數的橢圓邊值問題,在非結構四邊形剖分下,討論了兩種二次拉格朗日有限元方程的代數多重網格法,通過利用雙線性元和二次元基函數之間的表示關系,給出了一種新的網格粗化演算法和構造提升運算元的代數途徑。Additionally, it has utilized the harvest of the diffluent and confluence cross experiment made by beijing university of technology, which has enhance the application of the software and be of innovation
同時,軟體利用了北京工業大學建築環境與設備實驗室多年來在帶調節拉桿閥片的合流及分流四通局部阻力系數的實驗研究成果。這一點,將擴大了軟體的工程應用范圍。This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering. at first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu - lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band - pass filter, alternating amplifier, phase sensitive demodulatorn, pulse - width modulation, frequency scale circuit, moment current generator. finally, using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system, realized the testing functions
首先對加速度計及其測試技術的發展歷史和現狀,液浮擺式加速度計的工作原理和數學模型等作了簡要的介紹,然後確定了以二元調寬脈沖再平衡測試迴路為設計方案,並從控制理論的角度進行了分析,著重研究了系統中各部分的傳遞函數,利用系統開環傳遞函數分析了系統的穩定性,同時設計了系統的校正網路;分析了二元調寬脈沖再平衡測試迴路的解析度、采樣約束以及測試精度等基本問題,並按照系統分析的結果設計了包括前置放大、帶通濾波、交流放大、相敏解調、脈寬調制、頻標電路以及力矩電流發生器等測試系統各部分硬體電路,驗證了電路的正確性,最後按照測試系統的要求,採用了美國ni公司專為測試領域所開發的虛擬儀器工具? ? labview作為測試軟體開發工具,利用該圖形化編程語言完成了測試系統軟體部分的設計,實現了測試功能。This scheme integrates universual data accesss technology of microsoft, which plays a more and more important role in three - lay c / s ( client / server ) and uses the technology of ado ( active data access ), adopts the asp script language in display the results and uses stored procedure of sql server in databases design. in the system of b / s, client realizes a high efficient access to the server database through displaying diversified active controls in browser and using ado to access the data source. the disposing of data accures under the database not in the font of this system. this kind of scheme cannot only bring the system a higher real time response, but also decrease data runoff of the networks, lower the possibility that web server becomes bottleneck of the system and make the system more transplantable
當前的web數據庫訪問技術正處于發展階段,針對這種情況,本文通過分析當前各種流行的web數據庫訪問方案的優缺點,結合在三層次的c / s系統中扮演越來越重要的角色的中間件技術,採用了microsoft公司所提出的一致數據訪問技術,利用ado控制項,結合當前的asp語言,底層數據庫採用了sqlserver7 . 0的存儲過程技術,設計了一種自己的web數據庫訪問方案,即在browser / server系統當中,客戶端通過顯示在瀏覽器中的各種activex控制項,通過了ado連接數據庫,數據的處理利用了存儲在數據庫內部執行,實現對後端數據庫的高效訪問,並且這種方案在給系統帶來較高的實時響應性能的同時,減少了網路數據流量,降低了web服務器成為系統瓶頸的可能性,也增強了系統的可移植性。Through the implementing of kernel level file and cache mechanism at the client side, this newly proposed distributed network file system provides seamless network file access and reduces the performance decline caused by network transmission. utilizing the concept of logic block server, it provides the reliable data block storage and implements redundant storage capacity. utilizing the concept of the index server, it provide s the cost of the greatly for server and network during data access process and realizes the computing with balancing capacity
在客戶端通過實現內核級文件的調用和緩沖機制,實現了文件的無縫網路存取,並減少由於網路傳輸帶來的性能下降的影響;利用邏輯塊服務器實現邏輯塊的冗餘存取,實現數據塊的安全存放;利用索引服務器進行負載均衡計算,實現資料存取的較低網路和服務器開銷;利用索引服務器實現服務器組的零管理,使該系統具有高效性、穩定性和可伸縮性。The blade inner channel cooling is a complex convection - conduction coupling problem. this thesis build a three - dimension. compressible turbulence model, and give a general solve method. with the geometrical model of the glossily rectangle straight channel, the rectangle straight channel with in - line arrays disturb plates, the rectangle straight channel with staggered arrays disturb plates, the rectangle straight channel with slant disturb plates, this thesis compute the flow and heat transfer condition when the cold air path though these channels, and gain the temperature field, pressure field, velocity filed, in addition. this thesis also analyze the influence of the different channel height, the different channel materials, the different channels, and gain the function relation between he nusselt number, friction factor and reynolds number. this thesis is emphasis on the new heat transfer enhancement structure, that is, disturb plates, with the comparison with the glossily channel and channel with pin fins, the heat transfer enhancement effect of the former is better, and the conclusion can be used in the design of aircraft blade
葉片內部通道冷卻是一個復雜的對流?導熱耦合傳熱問題,本文在分析葉片內部通道冷卻的流動與傳熱情況的基礎上,建立了三維、可壓縮紊流的物理模型,得到了通用的求解辦法;利用不帶擾流片的矩形直通道、帶順排擾流片矩形直通道、帶叉排擾流片、帶傾斜擾流片的矩形直通道的幾何模型,計算了冷卻空氣通過這幾種通道時的流動與換熱情況,得到了各種不同情況下計算區域的溫度場、壓力場、速度場;在此基礎上分析了不同的通道高度、不同的葉片通道材質對葉片內部通道冷卻的影響,並整理得到了各種通道形式下,努謝爾數和阻力因子與雷諾數的函數關系;本文重點研究了新型的葉片內部通道冷卻強化傳熱措施?帶擾流片的內部冷卻通道的強化傳熱效果,通過與光滑矩形直通道、帶針肋通道的冷卻效果的比較,表明了這種新型鮚構的優勢,對于葉片內部通道冷卻結構的設計可以起到指導的作用。Under windows nt and labview development environment, using the linear fit module, exponential fit module > general polynomial fit module of labview to design a method for fitting the experiment data, the results of curve fitting indicate that the purpose of general polynomial fitting is better than the rest. separating the equivalent input impedance of magnetostrictive transducers without stimulate current from input impedance of it with stimulate loop based on the results of curve fitting, and determining the syntony frequency and electric simulation network parameters of magnetostrictive transducers by this input impedance. finally, with labview network functions, realizing magnetostrictive transducer electric simulation system based on web server and discussing a scheme for this system network by datasocket. the method of this paper can more accurately determine the syntony frequency and electric simulation network parameters of magnetostrictive transducers than the testing method of syntony & anti - syntony. at the same time, discussing virtual instrument measurement system and how to realize magnetostrictive transducer electric simulation network system by labview network functions of network virtual instrument measurement development environment
在windowsnt系統環境和labview虛擬儀器技術開發平臺下,首次利用labview中的直線擬合模塊、指數擬合模塊以及多項式擬合模塊,設計了一種對實驗所得數據進行曲線擬合的方法,對三種擬合方法進行了比較,曲線擬合結果表明,多項式擬合方法相對于其它兩種擬合方法效果更好;根據曲線擬合的結果可從帶激勵線圈的磁致伸縮換能器的輸入阻抗中分離出磁致伸縮換能器鐵芯在無激勵電流時機械振動形成的等效輸入阻抗,並由此輸入阻抗確定了磁致伸縮換能器的諧振頻率及其電氣模擬網路參數;最後通過labview提供的網路功能,實現了基於web服務器的磁致伸縮換能器電氣模擬虛擬儀器測試系統,並探討了通過datasocket技術實現該系統網路化的方案。It is a novel short - distance wireless communication technique, in which data are transferred using non - sinusoidal pulses with very short duration, so it is fit for using in indoor environments which is a typical multipath environment. and it can be coexisted with the existing wireless communication systems at the same frequency band
超寬帶通信系統利用納秒至皮秒級的非正弦波窄脈沖傳輸數據,非常適合作為城區及室內密集多徑環境下的應用,並且能夠與現有的傳統窄帶系統共存。Speech communication is one of the most used modes in the digital trunking communication system. excellent algorithm of speech coding can save the bandwidth resource, improve the utilization of frequency, so it has important value for investigation
語音通信是數字集群通信系統中最常用的通信方式之一,優良的語音編解碼演算法能夠更加有效地節省帶寬資源,提高頻率利用率,因此具有重要的研究價值。Since the suggested method makes a significant improvement in wind speed, it is more suitable for wind field estimation over complex terrain than other methods which only concerns the effect of distance. then we calculate the wind change with evaluation, last we can conclude the wind abase the hilly terrain, we find the wind in westward and center plain is much smaller than other area. while the wind in northward hilly area is much bigger with the hilly arising. the wind of chongqing is the biggest period in spring ( april ), the smallest period in winter ( january ), the wind in summer ( july ) is bigger than its in autumn ( october )
本文利用重慶及其周邊地區的常規氣象站的1951 ? 1980年30年的風速平均資料,針對復雜地形風速診斷,以地理信息系統為數據處理平臺,根據重慶1 : 25萬dem數據,來獲得重慶市實際復雜地形的高程,提出了一種適合於起伏地形的權重內插方法,通過引入一個表示地形起伏變化程度的因子,構造了一種新的權重函數,來處理復雜地形上的風速,通過與只考慮距因素同反平內插方法比較發現,本方法更適合在起伏地形條件下使用;然後根據經驗公式在地形上進行計算,得出重慶地區起伏地形下的風速分佈;得出重慶市的西部、中部平原地帶風速較小,而北部山區隨海拔高度升高風速也較大;重慶市風速最大時期為四月份,冬季一月份最小,夏季(七月份)大於秋季(十月份) 。Yesterday saw to an article said the modern professional woman, equally does not hug the child to surpass above for a hour every day, the majority all is holds for the child - care worker perhaps mother - in - law brings, usually all treats in the company to very late only then gets off work, returns only to be able to looks at a child on the way, even some people hand over by the south parents, only can use the week day to look them, except is very laborious also is unable with the child to establish the good relations, a little affects regarding theirs growth process, actually i spend nearly four hours back and forth coming and going to work, so long as can see daughter ' s lovable appearance was worth
昨天看到一篇文章說現代職業婦女,每天平均抱不到小孩超過一小時以上,大多數都是托給保母或是婆婆帶,通常都待在公司到很晚才下班,回到只能順路去保母家看一眼小孩,甚至有人交由南部的婆婆媽媽帶,只能利用周休假日通車回家看,除了是很辛苦也無法和小孩建立起良好的關系,對於他們的成長過程多少有點影響,其實我每天花近四小時來回上下班通車,只要能看到女兒可愛的模樣就值得了。Become a kind of new electronics circuit - current - mode circuit. it is replacing the traditional design method of the voltage - mode in the high frequency high - speed signal processing realm 。 this thesis mainly discussed the modified second - generation current conveyors based on the current - mode kinds of new cuicuit components, they are stronger modified standard current - mode parts in fuctions on this foundation. mainly including the modified differential difference current conveyor ( mddccii ) 、 the fully balanced second generation current conveyor ( fbccii ) 、 ( full balances ) four - terminal floating nullor ( fbftfn ) and the current differencing buffered amplifier ( cdba ), they are all function very strong standard current - mode parts, they all can provide some circuit functions of better than general operation amplifier, because they have the voltage importation and the current importation, therefore use it since can carry out the voltage - mode signal processing circuit expediently, can also carry out the current - mode signal processing circuit expediently, and have to increase the benefit bandwidth to accumulate more widely than the voltage - mode, but have their advantages more according to the current - mode filter of the modified current conveyor, because it constitutes in brief, the filter wave function is stronger and they are better than in general use operation amplifier of many advantages, be easy to composing for example 、 high speed 、 frequency bandwidth 、 the power supply voltage requests low 、 consume small, the impedance is different from etc. advantages, otherwise they have biggish dynamic range, and flexible circuit synthesize, so they are the best active parts
從第二代電流傳輸器ccii入手,重點研究了以下幾種改進型的第二代電流傳輸器:改進的差動差分電流傳輸器mddccii 、全平衡第二代電流傳輸器fbccii 、多輸出四端浮地零器ftfn 、全平衡四端浮地零器fbftfn 、電流差分緩沖放大器cdba的電路結構及其模型。然後在此基礎上系統地研究了基於這幾種改進型的第二代電流傳輸器的濾波器的設計方法,主要方法和結果如下:利用mddccii設計了差分式連續時間電流模式低通、帶通濾波器;電流模式跳耦結構考爾低通濾波器;利用fbccii設計了帶通二階節濾波器及電流模式雙二階通用濾波器;設計了基於多輸出端ftfn的電流模式二階通用濾波器電路;通過數字化開關選擇的基於fbftfn的電流模式通用濾波器;設計了基於最少個數電流緩沖放大器(兩個cdba )的多功能通用電流模式濾波器及其在非理想因素情況下分析。設計濾波器的主要方法是採用級聯設計、運算模擬(信號流圖法)和反饋設計(跳耦法) 。Withal, basing on study on the domestic and foreign farmland appraisal, on introduction land resource use trait in outskirts hill chongqing, the thesis introduces firstly international all - purpose five principles of sustainable land use management, exerts delphy to accept or reject repeat index elected, manages ahp and dsr to demonstrate system with bishan of representative outskirts hill county chongqing as a sample, studies on farmland appraisal index system of outskirts hill chongqing, and looks forwards to favoring farmland appraisal work of chongqing and doing indeed southward hill zone. the central conclusion as follows : 1 in the background of town land appraisal constantly perfect in our country, the cultivated land value management, as the part of land market, is more and more important
對此,本文在分析國內外農用地分等定級研究的基礎上,通過對重慶市近郊丘陵區土地資源利用特點的詳細介紹,引入國際上通用的持續土地利用管理的五大原則的基本框架,運用特爾斐法對所選指標進行多輪取捨,結合層次分析法、 「推動力?狀態?反應」法等數學方法,以重慶市典型的近郊丘陵縣? ?璧山縣為體系論證樣點進行體系論證,就重慶市近郊丘陵區農用地分等定級指標體系作以研究,以期對重慶市乃至南方丘陵地帶農用地分等定級工作的開展有所裨益。First of all, the characteristics of different adaptive algorithms and equalizers are theoretically researched. then digital microwave communication system model is build by simulink. based on this model, the convergent behavior and bit error rate performance of three equalizers ( nlms, kalman and rls ) are compared in multi - path fading channel
為了達到這個目的,首先需要從理論上對各種自適應均衡演算法以及自適應均衡器的特性進行深入研究;然後利用simulink建立接近實際環境的數字微波通信系統,在多徑衰減通道環境下比較了三種基帶均衡器( nlms , kalman和rls )的收斂特性以及系統誤碼特性,並比較了nlms基帶均衡器和通帶均衡器的性能。A method of pitch mark determination for a speech, includes : acquiring a fundamental frequency point and fundamental frequency passband signals by using an adaptable filter ; detecting a number of passing zero positions of the fundamental frequency passband signals ; and generating at least a set of pitch marks from a number of passing zero positions
一種決定語音音高標記的方法,系藉以找出一語音之一組音高標記,此決定語音音高標記的方法系利用一可適性濾波器取得一基頻點與一基頻帶通訊號;求取基頻帶通訊號之復數個過零點位置;然後經由復數個過零點位置產生至少一組音高標記。The characteristic and key technologies of the system are as follows : ( 1 ) in realizing the live broadcast of audio and video, the problem of immense multimedia data and low networks bandwidth utilization ratio is solved by using mpeg - 4 as format of audio and video data. audio and video data are collected by video card cv500 which developed by beijing sum tone company ; meanwhile, the contradictory between the delay of networks transmitting and the quality of the image is well solved by setting a " bi - buffer area "
系統實現中解決的關鍵問題和特色主要有以下幾個方面: ( 1 )在視音頻直播功能的實現中,通過使用北京算通公司的cv500視頻採集卡和cv500sdk進行視音頻數據採集,並採用當今最新的圖像和語音編碼壓縮標準mpeg - 4作為視音頻數據的採集格式,既保證了圖像的質量,又大大縮減了視音頻所佔的帶寬,從而解決了多媒體數據量大、網路帶寬利用率低的問題;同時,通過設置環形緩沖區的辦法來調和網路傳輸延時與圖像質量之間的矛盾,取得了較好的效果。In the course of the database design, after the design of space database structure, code, special symbol and the analysis of attribute data structure, using the database of maplnfo and access to build up and manage spatial and attribute data
在數據庫設計中通過對空間數據庫的結構設計、代碼設計、專題符號設計以及屬性數據結構分析等的基礎上,利用mapinfo4 0自帶的數據庫和access數據庫建立和管理本系統的空間數據和屬性數據。And more than 70 % hardware are tested during microcode self - test since the execution of micro program can cover other data paths. boundary scan is designed according to ieee1149. 1, and some other instructions such as degug, runbist are provided to support internal fault testing, online debugging and built - in self - test besides the several necessary insructions. internal scan is implemented by partial scan, through this the boundary of logic component and user - cared system registers can be selected to be scanned
Bist用於測試cpu的微碼rom ,其它ram則利用微碼rom中的微程序進行測試,而微程序的運行則可以順帶覆蓋其它數據通路,從而使高達70 %的硬體得到測試;邊界掃描按ieee1149 . 1標準設計,除必備的幾條邊界掃描指令外,還提供了debug 、 runbist等指令以支持內部故障測試、在線調試及內建自測試;內部掃描採用部分掃描策略,選擇邏輯部件的邊界及用戶關心的系統寄存器進行掃描,從而實現了硬體邏輯劃分,方便了后續的測試碼產生和故障模擬,並為在線調試打下了基礎。Species diversity dominance niche community ordination and classificationx population spatial pattern in desert - oasis ecotone in fukang, along with their relation to soil factors, are analyzed by quantitative vegetation analyze methods. the characteristic x dynamic of landscape ecological pattern and their influence factors are also analyzed by the partition of landscape transect. oasis stability is primary explored by the successive observation of soil water and salt in sangonghe basin in fukang
採用植被數量分析方法,分析了荒漠綠洲過渡帶植物群落的物種多樣性、優勢種生態位、群落排序與分類、種群空間格局,以及它們與土壤因子之間的關系;通過劃分景觀樣帶,分析了阜康土地利用景觀生態格局的特徵、動態及其影響因子;通過阜康三工河流域土壤水鹽的動態觀測,對于綠洲穩定性進行了初步探索。The electro - hydraulic proportional control law is given. the laws of tracking control of displacement and speed of aircraft as well as tracking control of angle and angular speed of belt wheel are designed by means of state feedback linearization and quadratic performance index linear optimal control method. the robustness of the designed systems is analyzed, and arresting processes are simulated
給出了電液比例控制規律;利用狀態反饋線性化及二次型性能指標線性最優控制方法分別設計了系統跟蹤控制飛機位移與速度以及跟蹤控制帶輪轉角與角速度的非線性控制規律;對所設計的攔阻系統進行了魯棒性分析及攔阻過程模擬,模擬結果表明,通過選取適當比例系數或控制權系數,兩種控制系統的控制效果及魯棒特性均優于新型飛機攔阻系統。分享友人