photon density 中文意思是什麼
photon density
解釋
光子密度-
We have calculated one - and two - photon absorption cross sections of the lowest excited states of a series of molecules combined with benzene, stilben, thiophene as center attached with amine, diphenylamine, diethylamine as electron - donor and nitryl as electron - acceptor ; the effects of molecular length, n center and electron - donor on two - photon absorption cross sections have been studied and all calculations have been carried out using the density functional theory at an ab initio level. it is found that the molecular length and the one - photon absorption intensity are quite strongly c orrelated factors, and that a corresponding correlation for the two - photon absorption is decreasing. it is also found that a most crucial role for the two - photon absorption is played by the n center
我們分別以苯、二苯乙烯、噻吩為中心，氨基、二苯氨基和二乙氨基為電子給體，硝基為電子受體組合形成的分子為研究對象，在從頭計算的水平上用密度泛函理論計算了這些分子在低激發態下的單、雙光子吸收強度，重點研究了分子的長度、中心和給體的供電子能力對分子單、雙光子吸收的影響。研究結果表明，分子長度與單光子吸收強度之間有密切關系，而在雙光子吸收中這種關系較弱；中心在雙光子吸收中具有重要的作用；在中心和受體一定的情況下，增加給體的供電子能力，可提高雙光子吸收強度。 -
A comparison between single photon absorptionetry of bone mineral density and laminated cortex index of radius and ulna in diagnosing osteoporosis
比較橈尺骨皮質分層指數與單光子吸收法骨礦定量法診斷骨質疏鬆癥的價值 -
Spontaneous emission can be totally suppressed or strongly enhanced depending on the relative position of the resonant frequency from the edge of the photonic band gap and the photonic mode density. several novel phenomena can be obtained. the spontaneous emission displays an oscillatory behavior, classical light localization, photon - atom bound state, nonzero steady - state population and anomalously large vacuum rabi splitting. and localized mode associated with a defect site in an otherwise perfect photonic crystals, acts as a high - q micro - cavity
通過原子上能級與光子頻率帶隙邊緣的相對位置或者光子態密度，可以抑制或增強原子的自發輻射。分析並得到了一些奇異的現象，如自發輻射的諧振子行為、光的局域、單光子?原子局域態、上能級中存在非零穩態原子布居數、類似於真空中的拉比頻率分裂等。 -
In the aspect of output characteristics, after applying the boundary conditions and the continue condition of two segments, the correlative dependence of average photon density in each segment has been obtained. combining this dependence with the threshold conditions, the theory foundation is settled
在兩段式dfb激光器的輸出特性研究方面，利用邊界條件以及兩段之間的連續條件，導出了兩段平均光子數密度之間的依賴關系；這和兩段式dfb激光器的閾值條件表達式相結合，構造了本文研究激光器輸出特性的理論框架。 -
How improving the capability of ict has become more and more an important task, for example, improving spatial resolution and density resolution, reducing scan time, enlarging the size of measure space, improving image quality, etc. moreover the question of the energy spectrum hardening and the photon scattering is one of important bottleneck to restrict the improvement of ict
如何提高工業ct的性能指標，如怎樣進一步提高空間解析度、密度解析度，減少掃描時間，增大可測工件尺寸，改善圖像質量等等成為了ct界面臨的重要任務。而其中射線的能譜硬化和散射問題，又是制約工業ct各項性能指標提高的重要瓶頸之一。 -
We deduce easily the coherent term of quantum dynamical model ( the off - diagonal of reduced density matrix ) by improving the nature of displace operator and the nature of coherent states. then, the interaction is energies of a two - photon mechanism and the usual one - photon or liner driving mechanism. we deduce the coherent term by improving the nature of squeezing operators, displace operators and canonical transformation
其一，僅有阻尼相互作用和勢能相互作用，此時利用位移算符的性質和相干態的性質很方便地推導了量子動力學模型的相干項（約化密度矩陣的非對角元） ；其二，考慮的是既有單光子相互作用又有雙光子相互作用，這時利用相干態、壓縮算符及正則變換等的性質推導出相干項。 -
The analyses given in this paper to quasi - three - level for 946 nm laser are complete. the relation between 946 nm laser transmission and optimal crystal length has been derived from the rate equations describing the population inversion and the photon density in the laser cavity in the steady - state case. the minimal claims to coating have been given on the base of contrasting 946 nm transmission with 1064 nm transmission in the condition of different cavity losses and how the pump beam radius in the laser crystal and optimal crystal length affect the laser threshold and output power of 946 nm laser has been given as well
對產生946nm譜線的準三能級結構給出了較為完整的分析，利用激光諧振腔處于穩態時的速率方程，導出了準三能級nd ： yag946nm起振時，透射損耗與最佳激光晶體長度的關系，在與1064nm透射損耗相比較的基礎上，給出了不同的腔損耗情況下的最低鍍膜要求，並且給出了激光閾值、輸出功率和最佳激光晶體長度及泵光光斑大小的關系，這為設計室溫下高效運轉的946nm激光器的提供了理論基礎，這種分析方法對研究此類低增益，準三能級或三能級激光系統輸出特性有借鑒意義。 -
The intensity at the. irradiated site decreased linearly with the power density of the irradiation light. this means that the light - induced change is a one - photon process. irradiations at different wavelengths indicate that the spectral change is frequency - selective
暗恢復過程的研究表明，光輻照后光譜的強度有恢復到輻照前強度的趨勢，擬合發現存在兩個恢復常數，一個為2 . 5小時，另外一個特別長。 -
The relaxation oscillation in solid - state laser with relaxation oscillation pumping is studied theoretically by the rate equation. the undulation of the laser photon density contains relaxation oscillation frequency itself and that of pumping. when those two frequencies are close, the oscillation will be resonated
我們用速率方程小信號近似方法對泵浦帶有弛豫振蕩的固體激光器的弛豫振蕩的特性進行了系統的理論研究，發現實際光子數的起伏同時具有自身固有的弛豫振蕩頻率和泵浦光的弛豫振蕩頻率兩種分量。 -
In this paper the average field is used to describe the carrier in each segment based on the carrier distribution in two - segment dfb lasers and the strict coupled wave theory is used to describe the photon density. combined with these two methods, the threshold condition expression has been derived for the first time
基於兩段式dfb激光器中的載流子分佈事實，本文對每一段內的載流子濃度用平均場方法處理；對于激光器內的光場分佈則應用嚴格的耦合波理論進行研究，通過將這兩種方法有機結合，首次導出了兩段式dfb激光器的閾值條件表達式。 -
The intracavity photon density and initial population inversion density are assumed to be gaussian distributions instead of plan wave assumption, based on this assumption, the rate equations of diode - pumped intracavity - frequency - doubled passively q - switched laser are modified. through solving these space - dependent rate equations numerically, the results under different assumption are compared. 5
將腔內光子密度和初始反轉粒子數的平面波近似修正為高斯分佈近似，獨立地導出描述二極體泵浦內腔倍頻-被動調q激光器的速率方程，並通過數值求解該方程比較了兩種近似下脈沖特性的不同； 5 .實驗驗證了2中提出的實驗方案，並對實驗結果進行了分析。 -
If the initial photon state is a fock state, the probability density of the electron exhibits bifurcation and confluence and the corresponding photon distribution is a time - periodic function which result from the energy exchange between the electron and field
Ck態時，隨著時間的演化，電子的兒率密度呈現分叉現象，相應的光子數分佈是時間周期函數，這是由於電子與光場之間有能量交換。在這種情況下，系統是封閉的。 -
Effects of photosyntheynthetic photon flux density and co2 concentration on photosynthesis of sugar - free micropropagation of sweetpotato plantlets
2濃度間接調控對甘薯無糖組培苗光合特性的影響 -
Pms has no obvious relation to age and has good relation to air temperature, photon flux density and air humidity. the pre - dawn pms is steady. compared with caraganar, the drought - resistance ability of s. viciifolia is stronger
枝水勢同年齡之間無明顯關系，與環境因子間有很好的響應，同大氣溫度和光照顯著負相關，與大氣濕度顯著正相關。 -
Three temperature equations include disconnected thermal conductivity coefficient and energy exchange terms between electron and ion, electron and photon, which are affected by the density an d temperature of the plasma, and by the atom parameter. implicit scheme have to be used to solve them. we use entirety linear iteration method to do this work
三溫方程含有間斷的熱傳導系數，存在著電子與光子、電子與離子的能量交換，這些量與離子的密度、溫度和原子物理參數有關，對它們的求解必須採用隱式格式，我們採用整體線性化迭代格式迭代求解。 -
Photosynthesis and transpiration have no obvious difference between different age s. viciifolia, but they have consanguineous physiological responses to environmental factors such as photon flux density, air temperature and the content of soil water. compared with caraganar, s. viciifolia formed the physiological mechanics of less photosynthetic rate and less tranpiration rate to resist drought
狼牙刺的凈光合速率同光合有效輻射、大氣溫度和二氧化碳濃度之間沒有顯著相關性，與土壤含水量顯著正相關；蒸騰作用與光合有效輻射、土壤含水量及空氣溫度有很好的正相關性，與大氣濕度有負相關性。 -
Based on the group - theoretical structure for the density - dependent multi - photon jaynes - cummings model, we have constructed the dressed su ( 2 ) coherent state. the atom and field squeezing and the anti - bunching effect for the system evolving from the dressed su ( 2 ) coherent state have been studied. in conclusion, we have discovered some new field and atomic squeezing in different systems, proposed a new kind of quantum state and discussed photon anti - bunching effect, sub - poissonian statistics distribution
5 .基於密度相關的多光子j那mes一c ~ gs模型的群結構，定義了密度相關的多光子jaynes一c ~ gs模型的修飾su （ 2 ）相干態，並研究了系統以修飾su （ 2 ）相干態作為初態的原子和光場的壓縮，光子的反聚束等效應。 -
This system employed diffuse photon density wave ( dpdw ) to detect the heterogeneities in biological tissues, and the rows of its laser sources and detectors were placed in a special way which made it possible to employ a simple algorithm for three - dimensional localization of heterogeneities
該系統利用射頻光子密度波來探測生物組織內部的異物，採用特殊的光源和接收器排列以應用簡單的演算法進行異物的3維定位。
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