boundary radiation 中文意思是什麼
boundary radiation
解釋
邊角輻射-
Introducing the theory and application of boundary element method on the sound radiation, giving the process of solving vibration noise radiation problem using boundary element analysis software ; presenting the coupling theory and the combination analysis of finite element method and boundary element method, and doing relevant analysis based on close drum shell ; programming the noise data simulation program using the numerical calculation software, simulating the acoustic and pressure data of a key point in the transient response acoustic field of the close drum shell, realizing the audibility of the noise, using the virtual reality tools to simulate the vibration noise of the drum shell ; combining the finite element method and boundary element method to analyze the vibration noise radiation of some gear box, and completing the whole simulation process of the vibration noise of the gear box
綜合介紹了邊界元法在聲輻射問題上的理論及應用；並給出了運用邊界元法分析軟體求解振動聲輻射問題的過程。闡述了有限元法和邊界元法的耦合理論及組合分析方法，並以封閉鼓形薄殼為分析對象進行了相應的分析。利用數字計算軟體編制了噪聲數據模擬程序，並模擬了通過組合方法分析封閉鼓形薄殼瞬態響應聲場而獲得一關鍵點的聲壓數據，實現聲音的可聽化，隨后通過虛擬現實工具實現了該情形下橢球殼振動噪聲的虛擬模擬。 -
At first the finite element theory for temperature analysis is introduced, and then mainly discussed the calculation models of cement hydration heat and the boundary condition under sun radiation
首先對這一方法的基本原理進行了簡要的介紹，著重探討了計算中的水化熱計算模型、日照邊界條件處理等。 -
Abstract : it is observed that the sommerfeld ' s formula for a progressive spherical wave is not covariant with respectro the rotation of the coordinate system. it contains complex partial waves that are not physical. the standing wave representation of the same formula is shown to be covariant and physical. it is applied to solve the boundary value problem of fiber optics. the radiation modes as well as the guided normal modes are obtained in closed forms. the intensity distribution in various modes is obtained. it is remarked that the mode of critical refraction is missing
文摘:說明了球面行波的索末菲公式在坐標轉動下不協變.證明了球面波的駐波表示是協變的，因而是一個物理的關系式，故適用於圓柱坐標中各類波動方程的定解問題.作為一個例，應用於光纖光學，導出了受導簡正模和輻射模的表達式，以及各模式的強度分佈 -
From mathematical models for inverse scattering in two dimensional inho - mogenous media including variable impedance, all kinds of probable mixed variable impedance boundaries and cracks, from interior and exterior trans - mission problems and radiation condition, ill - posed integral equation and indicator function method are formulated for the diverse of boundary iden - tification. it is shown that the kernel of the integral equation characters the boundary of scatterer, which is determined by solving it by virtual of regularity method, meanwhile, some numerical tests are given. 3
在二維非均勻介質逆散射邊界識別的數學模型（包括一般的非均勻介質，正交各向異性介質，變阻抗介質，各種可能的混合變阻抗邊界問題）下，由內透射問題和外透射問題以及輻射條件，推導了上述介質的邊界識別的積分方程和指示函數方法，由於積分方程的核充分表徵了散射物的邊界，由此說明只要利用正則化方法求解該積分方程，就可以確定散射物的邊界。 -
Food imported from within 50 km of the nuclear power stations will be monitored at the boundary and other entry points for contamination. food with radiation levels exceeding the standard for cross - boundary trade of l000 bqkg will be returned to guandong
由核電站五十公里范圍內的地區輸入香港的食物，都要在邊境及其他出入境檢查站接受輻射污染檢查。超過跨境貿易標準（每千克1000貝可）的食物須退回廣東。 -
Results are presented for the sound radiation efficiency and power of the modes of the rectangular baffled plate subjected to simply - supported boundary conditions when the plate is excited by obliquely incident plane wave
通過計算，得到了嵌在無限大障板中簡支板模型在斜波入射作用下的聲輻射功率和輻射效率。 -
The results show that a warm high ridge at the middle level and transformed surface cold high over the plain provide a good background condition ; a cooling process produced by net surface radiation fluxes is the trigger and strengthening mechanism for the fog event ; the subsidence flow at the middle and low tropospheric levels is favorable for the setting - up and maintenance of stable stratification at the boundary layer and weak wind condition at the ground layer over the fog region ; the transportation of weak warm advection at lower levels and weak lift motion at the boundary layer play a very important role to the long maintenance of the fog event ; the intrusion of north wind accompanied by cold advection is a main dynamic factor of the fog dissipation
結果表明：在中高層暖性高壓脊及地面變性冷高壓穩定維持的大尺度背景條件下，地表凈輻射引起的近地層冷卻是大霧過程的觸發和加強機制；中低空下沉氣流的存在有助於近地層的弱風條件和穩定層結的建立；低層暖平流的輸入和邊界層的淺層抬升是大霧長時間持續的原因；伴隨冷空氣南下的偏北大風是驅使大霧消散的動力因子。 -
For radiation measurement of foodstuff samples collected at boundary control points, wholesale and retail markets, as well as drinking water samples collected at reservoirs, inlets and outlets of water treatment works, water catchment areas and consumer taps
一共操作二十五臺食物食水污染監測系統，分析在邊境管制站、各區批發市場及零售市場抽取的食物樣本，及在本港各水塘、濾水廠水源出入口、集水區及用戶水龍頭抽取的食水樣本。 -
For radiation measurement of foodstuff samples collected at boundary control points, wholesale and retail markets, as well as drinking water samples collected at reservoirs, inlets and outlets of water treatment works, water catchment areas and consumer taps. locations of the food water contamination monitoring systems
一共操作二十五臺食物食水污染監測系統，分析在邊境管制站各區批發市場及零售市場抽取的食物樣本，及在本港各水塘濾水廠水源出入口集水區及用戶水頭抽取的食水樣本。 -
In this dissertation, the numerical computation for the acoustic radiation problem ( arp ) is studied deeply and systematically in the theory, method and the application technique, based on analyzing the situation of the home and abroad on the numerical computation for the acoustic radiation problem. the calculation formulas of the boundary element method ( bem ) for the exterior acoustic radiation problem in the full - space and half - space are deduced, based on the wave propagation theorem ; the arising of the non - unique solutions, which is associated with the application of the boundary integral equation ( bie ) in acoustic radiation problem, is analyzed and proofed ; the improved combined helmholtz integral equation formulation ( ichief ) is presented to overcome the non - uniqueness problem more effectively and reliably ; the determination of the singular integral coefficients on various occasions is analyzed ; the properties and treatments of the singular integrals with different orders axe studied ; the computation program of the cubic spline ichief is developed and its ability to overcome the non - uniqueness problem and feasibility to discrete the surface coarsely with the sufficient calculation precision are examined through examples
第二章在聲波動理論基礎上，詳細地推導出對應于無限域和半無限域的外部振動聲輻射問題的邊界積分方程計算公式；根據fredholm積分理論，對利用邊界積分方程計算振動聲輻射問題過程中解的非唯一性的產生進行了分析和證明；改進了chief法以提高其克服解的非唯一性的有效性和可靠性；對不同條件下奇性系數的計算、強奇性積分的收斂性及其在變量替換時與普通積分的差異性、不同階奇性積分的計算、數值求積分等進行了研究；開發了三次樣條改進chief法計算軟體，並通過算例考核了該方法在特徵波數處克服解的非唯一性的有效性和在保證計算精度的前提下實現剖分粗化以提高計算效率的可行性。 -
At man kam to boundary control point, lok ma chau boundary control point and sheung shui slaughterhouse respectively for screening radiation levels of livestock cow, pig and goat
在文錦渡邊境管制站落馬洲邊境管制站及上水屠房設置了三套牲畜污染監測系統，抽樣檢查牲畜牛豬及羊有否受到輻射污染。 -
At man kam to boundary control point, lok ma chau boundary control point and sheung shui slaughterhouse respectively for screening radiation levels of livestock ( cow, pig and goat )
在文錦渡邊境管制站、落馬洲邊境管制站及上水屠房設置了三套牲畜污染監測系統，抽樣檢查牲畜（牛、豬及羊）有否受到輻射污染。 -
The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment. the numerical results show that a more focused beam radiated in the broadside direction is achieved. the gain of the pbg patch antenna in the forward direction is improved by about 6 db. the radiation directivity is improved significantly and reaches 11. 5 db, which is 0. 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4. 1 db less than the difference achieved by thevenot et al.,
用fdtd方法並結合pml吸收邊界條件，我們對加了這種新的覆層結構並且基底鉆孔的復合結構電磁（光子）晶體貼片天線的性能進行了研究，結果證明加了這種新的電磁晶體覆層結構以後，天線的波束收攏很多，並且向前輻射的增益大大提高，與普通天線相比，天線的e面和h面方向圖上向前輻射的增益均提高了約6db ，另外，該復合結構天線的方向性系數達到了11 . 5浙江大學博士學位論文db ，與該物理尺寸天線的方向性系數的理論極限值（ 11 . 9db ）相差0 . 4db ，該差值比thevenot等人設計的電磁晶體覆層天線的相應差值減少了約4 . 1db ，比qiu等人設計的電磁晶體天線的相應差值減少了約1 -
The results also show that the precipitation forecast of the system is very sensitive to cumulus parameterization scheme, planet boundary layer ( pbl ) scheme and radiation scheme. for smaller meshes, the grell cumulus parameterization scheme is better than the other three cumulus parameterization schemes that are also tested in the experiments
數值模擬試驗結果還顯示，模擬降水預報對積雲參數化方案、邊界層參數化方案、輻射參數化方案等比較敏感；在網格比較小時， grell積雲參數化方案優于本文試驗的另外三種積雲參數化方案。 -
The conformal microstrip antenna with some unique character has been applied in many fields, especialy on speedy objects. in this paper, an efficient fdtd algorithm is introduced to analyse the microstrip antenna. firstly, the fdtd formula in descartes coordinate system and in cylindrical coordinate system are obtained from the time _ dependent maxwell equations using the yee algorithm in a calculating region where the dielectric parameters are independent of time and space. the choice of the space discretization units and the time discretization interval are discussed which are decided by the accuracy and stability respectively. the shape and setup of the excitation source are discussed too. the excitation source is chosen to be gaussian pulse in shape. secondly, the mur ' s first - order and second - order boundary condition are deduced in cylindrical coordinate system. the methods of transforming radiation fields from near zone to far zone in the frequency domain and in the time domain are presented when fdtd is applied to analyse the characteristics of far zone. finally, three kinds of microstrip antennas are analysed. they are a slot antenna that lies on a plane ground of a microstrip, a slot antenna that lies on a cylindrical ground of a microstrip and a microstrip line _ fed aperture coupled stacked rectangular patch antenna in cylindrical coordinate system
本文從麥克斯韋旋度方程出發，建立了笛卡兒坐標下無源空間中均勻無耗媒質的fdtd基本方程和圓柱坐標下無源空間中均勻無耗媒質的fdtd基本方程，詳細討論了fdtd法計算中時間步長和空間步長的選取原則以及激勵源的類型和設置；推導了mur一階和二階邊界條件在圓柱坐標下的差分格式；給出了在用fdtd法計算天線的遠場輻射特性時必需採用的頻域和時域近場遠場變換技術；最後用fdtd法計算了平面微帶縫隙天線、柱面共形微帶縫隙天線和柱面共形微帶層疊天線的輸入阻抗和遠區輻射場，並分析了天線的一些參數的變化對天線輸入阻抗的影響，得出了一些有用的結論。 -
On using wavelets to solve problem of acoustic radiation and scattering from axisymmetric body with arbitrary boundary conditions
子結構剛度對巨型框架減振結構體系的動態特性影響 -
The radiation problems of microstrip antennas residing in a cavity are analyzed by the edge - based fem with perfectly matched layer ( pml ) absorbing boundary condition ( abc )
將edge七asedfem與完全匹配層吸收邊界條件相結合，分析了背腔式微帶天線和背腔式分形微帶天線的電磁輻射特性。 -
The effect of wave radiation stress is considered in the compound fluid model. the value of bottom friction is offered by the wave - current bottom boundary layer model
復合流場學模型中考慮了波浪輻射應力的作用，底摩擦由波?流相互作用邊界層模型提供。 -
Based on the data of surface ozone, carbon dioxide, solar radiation, total ozone, climate observation as well as the boundary layer meteorological elements in 1994. 11 - 2002. 7, the characteristics of surface ozone and carbon dioxide are analyzed over waliguan by statistic method
本文利用瓦里關1994年11月2002年7月地面臭氧、二氧化碳、太陽輻射、臭氧總量以及邊界層氣象要素和氣候觀測資料，通過統計分析的方法，對瓦里關地區二氧化碳和地面臭氧變化特徵進行了初步的分析。 -
Food with radiation levels exceeding the standard for cross - boundary trade of l000 bq kg will be returned to guandong
超過跨境貿易標準每千克1 000貝可的食物須退回廣東。
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