threshold index 中文意思是什麼
threshold index
解釋
極限指數-
Threshold percentage of block space allowed per index entry
每個索引條目允許的塊空間的閾值百分比。 -
In this paper, micro - cavity semiconductor laser ( mcsl ) with pillar vertical - cavity surface - emitting structure ( vcsel ) which has potential applications in optical communication and optical interconnect is theoretically analyzed, the calculation model that used to discuss the modal performance of rectangular columnar and cylinder vcsel with oxidized aperture is established by using vector field model. the numerical simulations in the case of cylinder structure show oscillating wavelength and threshold gain against inside and outside radius of laser, the layer refractive index and pair number of bragg mirror, thickness, position and oxidized material ' s refractive index of oxidized aperture, in detail. more practically, considering dos shell of laser as non - perfect one, or supposing that dos shell is separated from the laser, we can obtain more significative results
本工作以矢量場模型出發，對具有誘人應用前景的柱形垂直腔面發射結構（ vcsel ）的微腔半導體激光器（ mcsl ）進行了理論分析，建立了用於分析方柱形和圓柱形結構具有氧化孔徑層的激光器的模式特性的理論模型；對圓柱形結構情況進行了數值模擬，得到了振蕩波長、閾值增益隨激光器內外半徑、 bragg反射鏡層折射率、周期數以及氧化孔徑層厚度、位置和氧化物折射率的詳細變化規律；為使理論計算更接近實際，將外加金屬包殼視為非理想導體，或將金屬包殼與激光器結構隔開，分別對這兩種情況下的結果進行了討論。 -
The model developed previously is used in calibrating the threshold value of both comfort level and convenience index of roadway alignment, and in developing safety analysis model for some existing black spots
本文在大量行車實驗數據的基礎上，分析得到如下成果: 1 ）在平曲線半徑上定性、定量的分析了加速度、速度與心率增長率的變化關系和模型。 -
This paper introduces the methods of hyperspectral images band selection based on the property of hyperspectral remote sensing images, utilizes the projection pursuit approach to find optimal solutions for a selected projection index based on dynamical evolutionary algorithm and then project a high dimensional data set into a low dimensional data space to produce a sequence of projection images, explores zero - detection method to threshold projection images to detect anomaly tar get
摘要運用基於波段間相關性的高光譜影像波段選取方法進行波段的預選取，採用投影尋蹤的方法在動力演化演算法的基礎上尋找最佳投影方向，將高維數據投影至低維數據空間，在各投影分量圖像上採用零點檢測閾值化的方法進行異常目標的提取。 -
The main work can be summed up as follows : firstly, we studied the thermal - field properties of vcsels, and analyzed the influences of current spreading, material parameters and operating conditions on the temperature distributions. secondly, we began with the electrode voltage and calculated the equipotential s distributions, compared the distributions of voltages and current densities in different depths of vcsels, and then studied the influences of the oxide - confining region with different position or thickness, and the different sizes of the gain - guided aperture and emitting window on the distributions of the injected current density, carrier concentration and temperature in the active region. thirdly, we realized the coupling of electricity, optical and thermal - fields, worked out the threshold voltage, calculated the distributions of the injected current density, carrier concentration and temperature under different offset voltages, and analyzed the impacts of temperature profile and carrier density on the refractive index, fermi levels and optical - field
具體工作可以概括如下：首先，研究了vcsel的熱場特性，分析了電流擴展，材料參數和工作條件對于溫度分佈的影響；其次，從電極電壓入手，計算出激光器中的等勢線分佈，並對不同深度處的電壓和電流分佈進行比較，研究了高阻區的不同位置和不同厚度、限制層和出射窗口半徑的大小對電流密度、載流子濃度和溫度分佈的影響；再次，實現了電、光、熱耦合，求出了閾值電壓，計算了不同偏置電壓下的電流密度分佈、載流子濃度分佈和熱場分佈，分析了溫度和載流子濃度變化對折射率、費米能級和光場的影響；最後，給出了考慮n - dbr和雙氧化限制層時激光器中的等勢線分佈，分析了n - dbr和雙氧化限制層對vcsel電流密度、載流子濃度、溫度和光場分佈的影響。 -
The result corrected by former result was to judge the land to be suitable for cultivation or not. in the end, productivity index threshold under different suitable - levels was determined by analyzing the frequency histograms distribution of 4 productivity index. the result shows that the productivity index criteria of reserved land in beijing is that altitude 800 m, slope 15, soil depth 30 cm and gravel content 15 %
在生產性指標方面，以北京市土地開發復墾潛力調查評價為基礎，運用相關分析、主成分分析確定指標為海拔、坡度、土層厚度和礫石含量；對指標進行聚類，根據聚類結果對原有評價結果進行修正並判定后備土地資源的宜耕性；通過分析多因素綜合作用下四項指標的頻率分佈情況，確定上述四個生產性指標在不同宜耕等級下的閾值。 -
There have very relativity in all kinds of threshold index, when other condition don ? change, different index as peak hour volumes, vpd, the size of new development and los etc may be interchangeable
在閾值中各類指標之間具有很大的相關性。當其它條件一致時，不同指標，如高峰小時交通量、 vpd （日交通量） 、設施的開發規模、 los摘要一等可以相互轉化。 -
On the basis of this, the effective reflective index with the variation of the carrier density is discussed. this paper also analyzed the random facet phase and the length of the cavity ' s influence on threshold characteristic. especially, the wavelength tuning characteristics have been investigated in detail when one segment works as absorbed region
在此基礎上，研究了每一段等效反射率譜曲線隨載流子濃度變化的情況；分析了邊界相位的不確定性以及激光器腔長對閾值特性的影響；重點討論了其中一段工作在吸收狀態下的波長調諧性質。 -
The system period is determined by weighted fusion result of all sensors periods with precision as weight and a index function is designed to evaluate the deviation of system period. when the index exceeds the given threshold, the algorithm adjusts the system period to track the data interval of all passive sensors
系統周期由各站點的周期按其觀測精度加權來確定，並設計指標函數來評估系統周期的偏差，超過給定的閾值時重新調整周期，能夠及時跟蹤各單站的數據間隔變化。 -
The equivalent cavity model is used to deduce the threshold condition of the ecld, and the expression of the threshold carrier density n ( v ) when ecld is tuned to oscillate at different frequencies has been obtained. using the expression of n ( v ) and the carrier dependent refractive index, the simple basic equation describing the bistable characteristics has been derived after choosing an appropriate reference frequency nf
通過建立等效腔模型來推導外腔半導體激光器的閾值條件，得到ecld在不同頻率v振蕩所需的閾值載流子密度n （ v ）表達式，利用該表達式及相關的折射率表達式，在選擇合適的參考載流子密度n _ f后，導出了一個描述雙穩所需的基本方程。 -
The maximum one side output power of uncoated lasers attain to 2w and the minimum threshold current is 120ma. thereafter, algalnp and algaas material system lateral real refractive index waveguided 650nm / 780nm double wavelength multiquantum well lasers for dvd - rom driver and dvd player ' s optical pickup system are simulated and designed on the basis of the experiment of conventional lasers and the former research of tunneling cascade devices
在此之後，結合650nm附近波長的常規algainp gaas多量子阱激光器的實驗結果與以往隧道級聯器件的研究，設計並模擬分析了基於algainp材料與algaas材料的可用於dvd - rom驅動器和dvd播放機光學讀取系統的側向實折射率導引隧道級聯650nm 780nm雙波長多量子阱激光器。 -
Previously men with a body mass index of more than 28 have been barred from joining the military - meaning that world - class rugby players such as england ' s lawrence dallaglio and new zealand ' s jonah lomu would be rejected. but by extending the threshold to 32 - two points above the world health organisation ' s definition of obesity - a 6ft recruit could weigh almost 17 stone and still be admitted
但現在有關方面將這一指標提高到了32 ，比世界衛生組織規定的肥胖標準還要高出兩個點，這樣的話，對於一個身高6英尺約1 . 83米的申請者來說，即使其體重高達17石約108公斤也依然可以被批準入伍。 -
Except that a new kind of quantitative method of index value is referred according to the factors changing and threshold characters
根據參評因子的變化及閾值特性，提出了動態監測指標屬性值的標度量化方法。 -
For solid - core optical fibers, great endeavor has been made and several kinds of fibers have been obtained. but the following research indicates that traditional solid - core structure has some deadly disadvantages : one is large reflective loss in input ends because of large reflective index of the solid core ; the other is low transmission threshold because of the structure disfigurements of solid - core. so their performances are far from th e applied requirements
紅外實芯光纖的研究已經深入開展了很久，也開發了一系列樣品，但后來的實驗研究證明，傳統的實芯光纖結構存在著很大的缺點：一是芯層材料的折射率比較大，因而耦合時光纖端面的反射損失比較大；二是實芯結構所存在的結構缺陷大大降低了光纖的能量傳輸閾值，所以其性能還遠不能達到應用的要求。 -
Threshold selection in tail index estimation based on exponential regression model
基於指數回歸模型的極值指數估計的門限選擇 -
Ni explains that the rising consumer price index ( cpi ) has caused the real income of those in the medium and low income bracket to drop drastically, adding the increase in threshold would help to reduce their tax burden
倪紅日介紹因為今年物價水平普遍上漲，中低收入人群的實際收入受到影響，適當提高免征額，降低中低收入人群的稅收負擔
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