有效聲場 的英文怎麼說
中文拼音 [yǒuxiàoshēngchǎng]
有效聲場
英文
observed acoustic field-
First, it was taken that a discuss about the effects of geometry parameters of each piezocrystal on direction parameters ( main lobe width, side lobe amplitude, elimination of grating lobes ), amplitude of ultrasonic pressure, element viberation pattern, mutual radiation among elements, efficient test regions, ability to keep accurate and near - field distance and so on. based on the direction of ultrasonic field in ulpa deduced by ourselves. in addition, on the base of integrating all kinds of factors, it was put forward that the principle and method for optimized design of geometry parameters of piezocrystals in ulpa transducer, and its design programme and interface were compiled
首先在推導超聲相控線陣換能器聲場的指向性的基礎上，就各個晶片幾何參數對指向性指標（主瓣寬度、旁瓣幅度、消除柵瓣） 、聲壓幅值、陣元振動模式、陣元間互輻射、有效檢測區域、精確控制能力、近場長度等方面的影響進行了論述，並在綜合各方面影響的基礎上，提出了晶片幾何參數優化設計的原則和方法，編寫了設計程序和界面。By the result of these experiments, acoustic emission ( ae ) was chosen to use in the research. at the same time, we analyse the phenomenon of acoustic emission at the base of theory, the characteristic signal of acoustic emission which comes from the faulty bearing at the angle of application, and the expression of the characteristic signal. contrast was also made on the data achieved separately from vibrational signal and ae signal, and it is proved that ae is feasible and available to the diagnosis to the fault of the rolling bearing
主要工作有如下幾方面：對本段前期實驗室階段採用的振動法幅值域無量綱處理進行了分析，並研製了現場所使用的滾動軸承故障檢測裝置，將無量綱參數診斷法應用於段修現場，且做了大量試驗；對于現場試驗中所出現的問題進行了分析，提出將聲發射的方法用於軸承的在線故障診斷；從理論上分析了聲發射現象，從應用的角度分析故障軸承的聲發射信號的特徵以及聲發射信號特徵的表示方法，並在實驗室中，採用振動法和聲發射法實時檢測的實驗數據進行了對比和分析，證明了使用聲發射法對軸承故障檢測的可行性和有效性。At the same time, the intrapartical diffusion and liquid internal mass transfer can been enhanced by ultrasound field, owing to additional stirring, the increasing rate of intraparticle diffusion coefficient is enhanced, while that of the liquid film mass transfer coefficient is reduced under ultrasound field
模型研究表明： freundlich ?兩相阻力模型計算得到濃度與實驗測定值非常吻合，超聲場能有效地強化浸取粒內擴散與液膜傳質，攪拌作用下超聲強化液膜擴散的的能力降低，強化粒內擴散的能力增強。The results show that the self - adaptive filter can be used to detect line spectrum, the wavelet transform and the fourier transform can be used to detect the ship noise in modulating the anisotropic noise field
結果表明：自適應濾波對于各向異性噪聲場中的線譜檢測有良好的效果；而小波變換和短時傅里葉變換對各向異性噪聲場中的艦船噪聲調制信號檢測有良好的效果。Abstract : by using the self - regulating electrostatic drying equipment, theelectrostatic drying for plant leaves is studied. the equipment is a surface silent discharge ozone generator. the electrostatic drying and natural drying are compared experimentally. the result shows that the electrostatic field is more effective for plant drying. the polarity characteristics of the electrostatic drying is discovered during the experiment and discussed. for accelerating drying, the polarity characteristics should be considered in the drying equipment design
文摘:在自製的沿面式無聲放電臭氧發生裝置上，對植物葉片進行了乾燥實驗.通過對植物靜電乾燥和自然乾燥的比較，證實靜電場對植物有明顯的乾燥效果.發現了靜電乾燥中的極性效應，即當管狀電極的極性為負時，乾燥速度較快.對極性效應進行了探討和分析.實驗結果表明:沿面式無聲放電臭氧發生裝置可以有效地對植物進行靜電乾燥.研究結果對有效地利用靜電乾燥和極性效應來合理設計靜電乾燥裝置的結構具有重要意義Hydraulic pound, vibrate, noise and cavitation are the main difficult problems in water hydraulic valves, and finite element numerical analysis is proved to be an effective computational method, so numerical simulation and visualizing research on the flow field in water hydraulic valves by applying finite volume method is very important
水壓閥中的液壓沖擊、振動、噪聲以及水壓閥中的氣蝕是研製水壓閥存在的主要難題，而有限體積數值計算方法又被證實是一種可行而有效的流場計演算法，因此應用有限體積法對水壓閥閥道內流場進行數值模擬和可視化研究，是非常有意義，也是非常重要的。The seismic modeling algorithm includes in two key steps in which one is for calculating effective elastic parameters in a fractured and caved media by using elastic wave equation, the other is for wave extrapolating by using acoustic one - way wave equation based on an equivalent geology model consisting of those effective parameters
地震正演方法包含兩個關鍵步驟，一是利用彈性波動方程計算含縫洞介質的有效彈性參數，另一步驟是根據有效彈性參數構成的等效地質模型，用單程聲學波動方程進行波場延拓。In order to verify the simulation field, the ultrasonic wave field radiating by a planar transducer was measured by small ball. by comparing the simulation field with the measured field, it is found that mgb is accurate in the far - field and most near - field region
為了驗證聲場模擬的可靠性，利用小球法測量了直探頭的水中輻射聲場，將試驗聲場和模擬聲場比較，發現多元高斯聲束模型在遠場區和大部分近場區都是有效的。As one of the most potential experimental stress measurement, ultrasonic technique was widely developed and applied in recent years. limited by their own characters, bulk wave and surface wave in ultrasonic frequency are difficult to be used to measure the internal tangent stress condition from the surface of medium. in many occasions, they will not be able to evaluate the working condition of mechanical components effectively
超聲波技術作為最有潛力的實驗應力測量技術之一，近年來得到了廣泛的發展和應用，然而超聲體波與表面波由於其自身的限制性，均無法從表面測量內部的切向應力狀況，在許多場合下無法有效進行機械構件工作狀態的評估。Thus, reasonable construction design, ornament design, weakness and diffusion noise are the effective methods to gain excellent acoustics
因此，合理的建築設計，裝飾設計，合理吸聲、擴散是營造良好聲場，獲得美好音質的有效手段。Researching on the technology if reverse order is to study strains if pits, structural systems if basement, environmental surwey and underpinnings. on account of emphasizing developing methods if checking strength if pick - ets, modemizing machenes of excavation and studying methods of underpinning is put forward and is a way if controlling the quality of pickets in sites, which leads an active effect ; synthetic application if rankintheory, spatial and time effect theory to excavation tl aanalyze the state of soil force and strain is brought forward and the time effect should be considered in the zone of clay, the formation and development of soil plasticity are analyzed and the most dangerous zone to decide how to excavate and where to begin is found ; analyzing the cause of picket settlement during reverse order and the differential settlement and discussing hlw to solute it. duringh the temporary survey and the environmental warship, bringing rorward the theory of environmental vibration and analyzing the state of soil force and probability of losing stabilization of soil under the effect of environmental vibration ; analyzing the state offeree in underground concrete wall by the method of mathematics and pointing out the place of the maximum force and deformation. based on systematic illustrating the reverse order, problems about application and development of reverse order and suggestions also are expressed
鑒于國內外的研究把重點放在大力發展工程樁的實驗室承載力監測方法與設備、如何使土方開挖機械現代化及對周圍建築的臨測方法上，本文提出了現場利用聲波層析成像技術監測鋼砼樁內部質量的方法與程序，並得出了聲波層析成像技術是砼樁的動態質量檢測的有效手段，這對指導施有積極、現實意義；提出了綜合運用朗肯土壓力理論、基坑空間和時間效應影響理論來分析逆作法施工過程中基坑邊坡土體應力及應變的變化情況，指出粘土地區也應考慮時間效應，並且進一步分析了基坑邊坡土體的塑性區形成和發展，找出邊坡最不利的區域，以確定地下室土體的挖掘的方式和順序，指出憑主觀臆斷與經驗來施工是不可取的；在分析、經較逆作法與大開挖順作法的地下室結構體系受力情況及施工順序的不同，提出了節點處理技術；分析了逆作法施工期間樁的沉降變化原因及由此而產生的差異，並探討了解決的方法；本文還提出了環境振動對土體邊坡穩定產生影響的觀點，並分析了在環境振動影響下，土體的應力狀態及土休失穩破壞概率，並且還運用彈性力學知識和數學分析的方法定量地分析了地下混凝土墻受力狀態，指出了被監測墻體的最大應力、應變位置。Using finite element and boundary element method, a modal analysis model of complex structural acoustic radiation in light fluid is proposed for computing modal acoustic radiation frequency, farfield sound pressure, modal radiated acoustic power and acoustic radiation efficiency
摘要採用有限元和邊界元方法建立了輕流體介質中復雜結構振動聲輻射的模態分析模型，可計算結構的聲輻射模態頻率、模態場點聲壓、模態輻射聲功率和聲輻射效率等聲場特性參數。This paper examines the effects of the mechanism - call auction mechanism and continuity mechanism by which securities are traded on their stock returns. firstly, we explain the relational concepts. later, under the market inefficiency hypothesis, we draw into the amihud & mendelson model of price adjustment. because the different market tradings have different assets and these assets are traded in different environments, hence it would be hard to discern differences resulting from the trading mechanism itself from differences due to dissimilarities of securities and environments. we offers to resolve this difficulty by comparing the stock returns in the opening transactions with the price behavior of the some stocks traded at the same exchange during the same period in the closing transactions
而後，在市場無效的假設前提下，我們引入了amihud和mendelson構建的帶有噪聲的偏調整模型。由於不同的市場交易有不同的證券，而且這些證券又處在不同的環境中交易，因而很難看出排除證券本身以及環境因素后，交易制度對股票價格行為的影響。因此，我們利用同一交易所交易的同一股票在盤整時期的開盤（開盤交易採用集合競價制度）和收盤（收盤價採用連續競價制度確定）數據來比較不同的交易制度對股票收益的影響。The results of simulated and xperimental fringe patterns are presented to illustrate the processing of the new method. secondly, considering the phase of fringe pattern can be recovered by solution of a equence of linear systems of equations, and the corresponding matrices are quite large and parse, the optimum numerical methods are available to solve this kind of systems
結果表明，用本文的方法，能夠有效濾除掉條紋圖中的高斯型、均勻分佈的隨機型噪聲，從而由單幅條紋圖獲得對應于該條紋圖的全場相位分佈，文中給出了模擬和實驗的處理結果。But the nnd algorithm can " t reach 2 - order precision, and the cell - centred finite volume algorithm is not suit to solve hypersonic problem. for the efficiency of the four - stage runge - kutta time - stepping scheme is low, and the robust is bad for the hypersonic problem, an implicit time - stepping scheme is adopted. this scheme can preserve the results precision and improve the computing efficiency sharply, and is an innovation for the time - stepping scheme of unstructured grid
為了解決目前傳統四步龍格一庫塔時間推進效率較低、計算高超聲速流場時魯棒性較差的問題，本文改進並採用了一種隱式時間推進格式，能夠在保證精度要求的情況下有效的提高流場計算時的計算效率，對基於非結構網格的時間推進格式有了發展和創新。With the restraint of our economic developing level, many enterprises in china have n ' t the ability to compete with foreign large transnational companies. some group enterprises ca n ' t establish their market fame because they lack of effective systematic management. while transnational companies widen the gap of abilities in scale, technology, product and marketing between china and world advanced level by strategic alliance and integrated marketing
現階段受經濟發展水平的限制，我國許多企業的實力較弱，暫時不具備與國外的大型跨國公司直接抗爭的能力，一些大的集團公司在市場營銷方面由於缺乏系統性的有效管理，市場營銷往往表現為方式和手段凌亂，競爭力不強；集團內企業各自為戰，傳遞給消費者的「聲音」不一致，很難樹立起集團公司的市場知名度。This article tries to bring three new ideas : ( 1 ) discussing the emergence of venture capital market by using the institutional economics and transaction cost theory. ( 2 ) analyzing the efficiency of venture capital investment management mechanism under different models by systems analysis method and comparative analysis method. ( 3 ) expounding logically the incentive effects resulting from phase - investment by market reputation models
本文在三個方面力圖創新： （ 1 ）用制度經濟學的觀點和交易費用理論解釋風險資本市場的產生； （ 2 ）採用系統方法和對比方法，分析不同模式下的風險投資管理機制的有效性； （ 3 ）採用市場聲譽模型，從嚴格邏輯意義上證明了風險投資中分階段投資的激勵效應。Liye pharmaceutical always lays its focus on quality of its products and has established a practical and effective quality assurance system, which has brought wide and high reputation to the products of liye that are widely accepted by the market for stable quality, good price and remarkable efficacy, such as chaxinnamin pian with extremely high share of market and weiyou pian of gold prize for top sales in 2001
立業制藥股份有限公司一貫堅持以抓產品質量為企業宗旨，建立了一套行之有效的質量保證體系。嚴格的質量保證體系，使得「立業」牌產品在市場上享有良好的質量聲譽。在許多省份被推薦為消費者信得過的優秀產品。Employing the random walk model, the white - noise models and nonlinear models to test the weak efficient market of china " s capital market, this essay find that china " s capital market hasn " t reached the lowest efficient market
本研究採用隨機遊走模型（ therandomwalkmodel ） 、白噪聲過程模型（ thewhite - noisemodels ）和非線性模型（ nonlinearmodels ）對我國資本市場進行弱型有效市場檢驗，結果表明，迄今為止我國資本市場還沒有達到最低層次的有效市場狀態。Abstract : to against the fact of the commercial available white noise generators are very expensive which is not good for general operations, a simple and effective limited band white noise generator is design. the generator is using the feature of dual polarity transistor, i. e., the power spectrurn density of particulate noise is not related to frequency in very wide band and close to white noise. the concrete circuit is also given
文摘:針對市售白噪聲發生器價格昂貴，不利於一般場合使用的問題，介紹利用雙極性晶體管散粒噪聲功率譜密度在非常寬的范圍內與頻率無關，屬白噪聲這一特性，設計了一種簡捷、有效的限帶白噪聲發生器，並給出了具體電路。分享友人