查询词典 spectral theorem

In order to investigate and monitor spartina alterniflora resources in the Luoyuan Bay, this paper illustrates the image process and interpretation based on the Landsat TM/ETM+ remote-sensing data of 2000 and 2006. On the base of the spectral analysis of different ground objects, NDVI and tasseled cap transform adopted on multi-spectral images, the algorithms for extracting and rectifying the spartina alterniflora from other landscape types were determined by decision tress classify in combination with visual interpretation.

为了对福建罗源湾互花米草进行监测研究，以2000年和2006年的LandsatTM/ETM+影像为数据源，在对不同地物进行光谱分析的基础上，结合进行了影像归一化植被指数和缨帽变换处理，建立了利用决策树分类法提取罗源湾互花米草的遥感解译技术。

Through collection of TIG welding arc light spectrum of steel with disturbing factor,this paper studied the effect of disturbing factors such as rusty and various gas flow rate on the arc light spectrum distribution.Furthermore, the light radiation of different spectral zones was studied to get the spectral signals that could reflect the disturbing factors which were critical for online welding quality control.

通过对干扰因素下TIG焊电弧的光谱信息进行采集，研究了气流量变化、焊接试件表面存在锈等干扰因素对焊接过程电弧光谱分布的影响，并基于光谱分布的分析，进一步探讨了不同光谱谱段对干扰因素的反映，寻求实现焊接过程质量在线光谱测控的理论依据。

In this paper according to the formula of spectral matching factor,the spectral matching factors of GaAs photocathode for dark green paint,rough concrete and green vegetation are calculated.

李蔚本文根据光谱匹配系数的表达式，计算了GaAs光电阴极与暗绿色涂层、粗糙混凝土和绿色草木的光谱匹配系数。

The spectral matching coefficients between two kinds of BV-EMCCDs and dark green paint, rough concrete, green vegetation under clear starlight and full moon were calculated and compared, according to the expression of spectral matching coefficient.

根据光谱匹配系数表达式，计算了2种背照明电子倍增CCD与暗绿色涂层、粗糙混凝土和绿色草木在晴朗星光和满月光条件下的光谱匹配系数并加以比较。

The volumetric method is also used in the measurement of the base metal and the principal elements in the high Cr cast iron and the electrooptical spectrographic method for determination of multi elements in the high Cr cast iron is established by choice of certain basic elements as the internal standard,by correction of the base spectral line and the interfered spectral line and induced correction and blank correction of the material as well as by drawing up the correction curves.

采用容量法测定高铬铸铁中基体及主要元素的含量，通过选用基体元素作内标，对谱线进行基体和干扰校正以及材质的诱导校正和空白校正，绘制校正曲线，建立了光电光谱法测定高铬铸铁中多种元素的方法。

According this problem, firstly this paper delves into radio circumstance of the band, frequency selecting rule and spectral density estimation. Basing on this research, this paper puts forward a frequency selection scheme basing on estimating spectral density of channels in 2.4GHz~2.5GHz.

针对此问题，本文首先深入研究了该频段无线电环境、选频准则及功率谱估计理论，在此基础上提出一种基于信道功率谱估计的选频方案。

The least power detected at the entrance pupil is 10-12W/cm2, spectral resolution is 2% and the measuring speed is 10 spectral lines per second.

入瞳的最小可探测率为10-12W/cm2，光谱分辨率为2%，测量速度为10条谱线/s。

For meeting the needs of automated real-time dynamic monitoring of heavy fog events by means of a weather satellite remote-sensing technique for specialized meteorological services like military operations and highway traffic, the paper presents a systematic study of spectral characteristics of visible and infra red light, the textures and dynamic dispersals of fogs on satellite imagery in the context of theory on the transmission of atmospheric radiation, thereby revealing their abruptness, waviness and mass-like features, which, in combination with a synthetic technique for cloud/fog maps of multi-channel remote-sensing spectra are used to set up a model for automatic separation of fogs from clouds based on the integrative application of spectral features and texture structures, for which are constructed corresponding discfiminant functions and criteria, and on this basis prepared is a"system for remotely-sensing monitoring of low cloud and heavy fog"which has been used for tests, with the main conclusions shown as follows.

本文针对军事和高速公路等专业气象服务中应用气象卫星遥感技术对大雾进行自动化实时动态监测的实际需要，从大气辐射传输理论入手，系统地研究了气象卫星遥感图像上云雾的可见光和红外光谱特征、纹理结构特征和大雾的消散动态特征，揭示了雾的突发性、波动性和团状雾特性，通过研究多通道遥感光谱的云雾图像合成技术，建立了综合应用光谱特征和纹理结构特征的云雾自动分离模型，给出了相应的判别函数和判别准则，研制了&低云大雾遥感监测系统&，并进行了实际应用试验。

In the third chapter,We study some geometric properties and spectral propertiesof the Jacobi operator on a solvable extension G of Heisenberg groups H.In the firstsection,we give the definition of G and some fundamental geometric properties on G.Inthe second section,we discuss the Integrability of certain subbundles and the geometricstructure of the induced foliations in case of integrability.In the third section,we studythe spectral properties of the Jacobi operator of G.

可解李群与类对称空间亦密切相关，Damcek-Ricci空间即是广义Heisenberg的一可解扩张李群，在第三章中，我们构造且研究了Heisenberg群的一可解扩张李群G的几何性质，第一节讨论了G的曲率，李指数映射，整体坐标等基本几何性质；第二章研究了TG的某些子丛的可积性及可积时诱导叶片的几何结构；第三节给出了G的Jacobi算子的特征值和相应的特征子空间。

The effects of hot/dense hadronic environment on the spectral function of p meson is analyzed. It is found that hot/dense environment plays an important role to the spectral function: when the temperature or the density is not too high.

本文基于虚时形式的有限温度场论，分析了热密强作用物质环境对ρ介子性质的影响，计算得到了ρ介子的谱函数。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。