dft

dft

1. At the year of 1971, Weinstein and Ebert applied DFT in parallel transmission system, as a part of modulation and demodulation.

1971年,Weinstein和Ebert把离散傅里叶变换(DFT)应用到并行传输系统中,作为调制和解调过程的一部分。

2. DFT-Code acquisition method can estimate Doppler shifts while searching PN phase.It is necessary to increase the number of DFT points to keep the frequency error in the range of trace loop.

DFT伪码捕获算法在进行伪码搜索的同时估计多普勒频偏,为了满足捕获精度要求,需要增加DFT点数,但随着运算点数的增加硬件实现难度成倍增长。

3. Theoretical Study on Reaction between O(lD) and CF2HC1By means of the density functional theory (DFT) and the Moller Plesset second-order correlation energy correction (MP2), the reaction between O(*D) and CF2HC1 is studied.

O(~1D)与CF_2HCl反应的理论研究 用量子化学密度泛函理论(DFT)和G3B3方法，对O(~1D)与CF_2HCl的反应进行了研究。

4. Hou Zhengxin,Wang Zhaohua,Yang Xi.Design and implementation of all phase DFT digital filter[J].Acta Electronica Sinica,2003,31 (4):539-542(in Chinese).

[1]侯正信,王兆华,杨喜.全相位DFT数字滤波器的设计与实现[J].电子学报,2003,31(4):539-542.

5. Resently, S.Moshe and D. Hertz presented a method to compute the DFT of an ?N??point real vector and IDFT of the DFT of another ?N??point real vector by a single DFT.

不久前,Moshe和Hertz提出用一个复向量的DFT计算一个实向量的DFT和另一个实向量的DFT的IDFT,这是一个具有理论意义和应用价值的结果.

6. DFT theoretical study on the structure of magic clusterSeven typical structures of magic cluster (SiO_2)_8O_2H_4 are present.

中性幻数团簇(SiO_2)_8O_2H_4结构的密度泛函理论研究

7. In order to study local properties of the adsorbate molecules, we model the adsorption systems as clusters, calculate their energectics and geometries using DFT, and simulate the STM images.

为了研究吸附分子的局域性质，我们采用团簇模型模拟表面吸附体系，使用电子密度泛函理论计算了体系的能量和构型，模拟了STM图象。

8. To reduce computational complexity of DFT,a recursive formula of DFT was put forward according to a natural idea of adding the latestdata item and deleting the firstone,butit can notbe used conveniently undersome situations.

为减少离散傅里叶变换(DFT)算法的计算量,人们利用一种很自然的增减数据项的方法提出了递推傅里叶变换算法,但在某些情况下,该传统递推算法并不太适用。

9. The optical signals of wakes stimulated in laboratory are analyzed and calculated mainly by using MATLAB tools of filter,disperse Fourier transformation (DFT),and statistic semaphore managing etc.

主要利用滤波器、离散傅里叶变换、以及统计信号处理方法等对实验室模拟的尾流信号进行分析和处理、计算.

10. However, a trial had found that introducing airport-style checks across the board would be impractical and would antagonise the public, the DfT added.

交通部说，一个试验已经证实，机场式的检测方式是不切实际的是和公众敌对的和DTF也会增加！

11. Small areas only. Multiple coats may be needed to achieve specified DFT.

仅适用于小面积，须多道涂层以达到规定膜厚。

12. The popular methods to calculate the dipole moments and Mulliken populations of the ground and excited states are introduced, such as HF, DFT and CASSCF methods.

介绍了当前计算基态和激发态偶极矩和Mulliken集居数的方法,如HF, DFT以及CASSCF方法等。

13. In the conventional phasor measuring method based on DFT(discreteFourier transform),no overall consideration is given to the phase angle error. Thus,the frequency calculation and phasorestimation results are not sufficiently accurate.

传统的基于离散傅里叶变换(DFT)的频率跟踪算法对相角误差的考虑不全面，从而其频率、相角、幅值等计算结果也不够准确。

14. Classical method based discrete Fourier transform (DFT) is not correct to view the phase as unimportant, but the reconstructed speech quality will be affected for high levels of additive noise.

传统的基于离散傅里叶变换的语音增强方法认为相位不重要，但在高噪时，重建语音质量受到很大影响。

15. Whereas, mean search efficiency of PPR based approach is 32% higher than that of DFT based approach, and 34% higher than that of DWT based approach respectively.

但是基于PPR的相似搜索算法的平均查询效率分别比基于DFT和基于DWT方法高32%和34%。

16. Have you tried to run our drive fitness test (DFT) utility?

你有试过在这颗硬碟上执行我们的磁碟健康测试(DFT)软体吗?

17. By using a special complex number, a radix 6 FFT algorithm is developed, in which the component 6 point DFT?s do not require any multiplication.

使用非直角坐标系下特殊形式的复数系统 ,给出了一种基 6快速傅里叶变换算法 . 其中 6点离散傅里叶变换不需要实数乘法 .

18. In this thesis, the structures and properties of DMB were investigated by the density functional theory (DFT) methods.

借助量子化学中的密度泛函理论(DFT)方法,对2,2-二羟甲基丁醛的结构与性能进行了理论研究,探讨了其结构与性能之间的关系。

19. The computations of all phase equilibrium properties and direct correlation function for DFT are developed systematically from FMSA.

其中的相平衡性质以及密度泛函理论中的直接相关函数的计算均系统地来自于FMSA。

20. This is owing to 3 major factors: performance increment of 64-bit CPU, optimized compiler, and contribution from DFT, a FFT software in Intel MKL mathlab.

其性能的提高主要归功于3个因素,即64位处理器硬件性能的提高、优化编译器的贡献和Intel MKL数学库中DFT程序的贡献。

21. The main contents are organized as the following:(1) Adsorption of methanol on (111) surface of coinage has been investigated by DFT method, at the generalized gradient approximation (GGA) level.

具体研究内容及其结果如下:1采用密度泛函理论(DFT)和广义梯度积分(GGA)的方法,对甲醇在Cu(111),Ag(111)和Au(111)面四种位置(top, bridge, hcp, fcc)的吸附和解离行为进行研究。

22. The influence of the DFT leakage errors on the sound intensity measurement is analyzed and the simulation examples are presented.

分析DFT泄露误差对声强测量的影响,进行模拟计算。

23. Electron property and isomerization reaction of pyridazine derivatives which were organic functional molecules were researched employing ab initio HF and (DFT)/B3LYP.

利用从头算ab initio HF和密度泛函理论(DFT)/B3LYP方法。

24. Ab initio molecular orbital and density functional theory (DFT) in conjunction with different basis sets calculations were performed to study the N-H...

利用分子轨道从头算理论和密度泛函理论结合不同理论基组对于N-H...

25. Base on the mathematical conformation between antenna array distribution to its far field and DFT to IDFT, we discuss how to obtain the array distribution by sampling far field pattern in some space angles based on DFT.

利用天线阵列分布及其相应的阵列方向图与离散傅里叶变换对之间在数学上的同构,对不同空间角度上阵列方向图的采样值进行离散傅里叶变换(DFT)来重新确定天线阵列的激励分布。

26. The reaction mechanism of BrO with CH3SH has been investigated by density function theory (DFT) and electronic density topological analysis method.

利用密度泛函和电子密度拓扑分析方法对BrO与CH3SH反应的微观机理进行了理论研究.

27. Adsorption of acrylonitrile(AN) on different sites of Cu(111) surface was studied by using model copper cluster Cu16 with density functional theory (DFT).

利用密度泛函方法对丙烯腈在Cu(111)面上不同吸附位的吸附状态进行了理论研究.

28. Using DFT method, Theoretical study was performed at B3LYP/6-311++G~(**) level to get the ground state geometries of the complexes and photodissociation fragments.

利用密度泛函理论,使用从头算方法,在B3LYP/6-311++G~(**)水平下,优化得到各个络合物的基态构型以及光解碎片的稳定结构。

29. The error caused by temperature drift and noise was eliminated by applying DFT in the calculations of the phase difference and voltage amplitude and current amplitude.

利用离散傅里叶变换计算相位差和幅值,消除了温漂和噪声的影响。

30. SC discrete Fourier transformer(DFT) are achieved using the component, and the least capacitances and the most well rate of capacitance were designed.

利用这些基本元件实现了开关电容离散傅里叶变换 ,并进行了最佳电容值和最佳电容比设计 ,使电路具有运算精度高 ,运算速度快和便于实现大规模集成等优点 .

31. Also, because the Cooley-Tukey algorithm breaks the DFT into smaller DFTs, it can be combined arbitrarily with any other algorithm for the DFT, such as those described below.

另外，因为Cooley-Tukey算法是将DFT分解为较小长度的多个DFT，因此它可以同任一种其他的DFT算法联合使用。

32. In this Chapter, we present the low-complexity windowed DFT based MMSE channel estimators for both the interpolation and non-interpolation cases.

另外，在时域，我们还对得到的等效信道冲击响应向量使用一个加权函数来减小信道噪声的影响。

33. The methodologies of design for testability(DFT) are widely realized in the digital circuits test.

可测性设计(DFT)方法广泛应用于数字电路测试中.通过添加测试硬件,用来降低测试的复杂性。

34. Design-For-Testability,DFT has become a very important part of the CMOS chip and system design.

可测试性设计(Design-For-Testability,DFT)已经成为芯片或系统设计中不可或缺的重要组成部分.

35. Synthesis, DFT and verification technologies are introduced for ASIC implement in the chapter five.

同时介绍了可测试设计和各种验证方法。

36. Whilst the Raman and infrared spectra of thymine were recorded, and the spectra of thymine calculated from DFT agree with the experimental results.

同时，在实验上测量了胸腺嘧啶的拉曼光谱和红外光谱，理论计算结果与实验结果基本一致，结果表明，同已报道的计算结果相比，文章的计算结果总体上更接近实验值。

37. "Since the basic function of DFT are uncorrelated, the correlation performed in the DFT for a given subcarrier only sees energy for that corresponding subcarrier.

回复楼主：因为DFT的基函数是不相关的，对某一个子载波，DFT的相关性能（其实就是不相关性）使得该子载波的能量不外泄（也就是没有能量泄露）。

38. In GCMC simulation and DFT calculation,the nitrogen is modeled as a Lennord Jones (LJ)spherical molecule.

在GCMC模拟和DFT计算中,流体分子模型化为单点的Lerrnard-Jones球;

39. DFT is used to estimate the covariance matrix of downlink channel of the path, not calculating DOA.

在不求出DOA的情况下,采用离散傅里叶变换来估计该路径下行信道协方差矩阵。

40. In Linear system, Fourier Transform (FT), Fourier Series (FST), Fourier Z Transform (FZT) and Discrete Fourier Transform (DFT) are used to analyze and process signals.

在信号分析与处理中,常涉及的积分变换是傅里叶变换(FT)、傅里叶级数(FST)、傅里叶Z变换(FZT)及离散付里叶变换(DFT)。

41. The result of Discrete Fourier Transform(DFT) in asynchronous sampling is not accurate and can not satisfy the requirement of synchronized phasor measurements,due to spectral leakage and barrier effect.

在异步采样的情况下,离散傅里叶变换(DFT)由于频谱泄漏及栅栏效应,计算结果不够精确,不能满足同步相量测量精度的要求。

42. In the data process the measured complex time signal is converted into frequency signal by DFT to get vibration information regarding frequency and amplitude of the rotor.

在数据处理中,对所得到的复杂时域振动信号进行了离散傅里叶变换(DFT),从而在频率域获得了转子的振动频率和振幅信息。

43. In this paper an adaptive method of evaluation on DFT for power system frequency is adopted through comparing with other methods.

在频率测量方法的选择上,本文通过比较采用了基于离散傅立叶变换的自适应估计算法。

44. In frontend of speech recognition，most feature extraction techniques involve in their primary stage a Discrete Fourier Transform (DFT) of consecutive, short, overlapping windows.

大多数特征提取技术是在离散的连续付立叶变换平台上，简要地说，就是重叠窗体。

45. DFT is derived from TF theory, but its rigorous theoretical proof was given by Hohenberg and Kohn in 1964. They proved that all properties ofmany-electron systems are a unique functional with electron density.

密度泛函理论源于TF理论，但其严格的理论证明却是由Hohenberg和Kohn于1964年提出的。

46. The nitrogen adsorption isotherm (p/p0 up to 0.01) of five samples with known crystal pore sizes were measured. The data were calculated according to HK(Horvath- Kawa-zoe) theory and DFT (density functional theory) method.

对5个已知结晶学孔道尺寸的分子筛样品的氮吸附等温线(P/P0到0.01)采用不同孔模型的HK方法和DFT理论进行了计算。

47. Methods of high-resolution DFT extrapolation and AR model-based extrapolation are investigated methodologically.

对不同的信噪比条件下,两种方法外推前后ISAR像的距离和方位分辨率及相关性作了比较分析。

48. The agreements with DFT calculations for semiconducting CNTs in the literature are satifying.

对于半导体奈米碳管，其结果与文献上之密度泛涵理论(DFT)计算相符；

49. As concerning the calculation, recursive DFT or non-recursive DFT is employedpresently to calculate the synchronized phasor.

对于同步相量的计算,目前大多采用递归或非递归的离散傅立叶算法。

50. In this paper,the double-speed synchronous sampling method is introduce d to the power system harmonic measurement, and the corresponding algorithm mode l of DFT is deduced.

将双速率同步采样法用于电力系统谐波测量，导出相应的DFT计算模型。

51. Discrete fourier transform ( DFT) was introduced into the spatial domain signal processing to analyse and process the uniformly spaced linear array signals, and a method to extract the DOA of signal was presented.

将离散傅里叶变换(DFT)引入到空域信号处理中,对等距线阵接收的信号进行了分析和处理,提出了一种提取信号来波方向的方法.

52. The discrete Fourier transform (DFT)and discrete Hartley transform(DHT) can be considered as special cases of DYT.

常用的离散傅里叶变换（DFT）、离散哈特莱变换（DHT）均可视为DYT的特例。

53. This paper also introduces application of DFT in a project-ASIC of mark algorithm.

并介绍DFT在一个具体项目-标记算法的ASIC实现中的应用。

54. Applying Volterra functional series and discrete Fourior tansform (DFT) to the system, we can obtain the model of the system in discrete frequency domain.

应用Volterra泛函级数和离散傅里叶变换理论于非线性系统,本文给出非线性系统在离散频率域的模型。

55. Based on density-functional theory (DFT) and density-functional perturbation theory (DFPT) we have discussed systematically the hydrogen isotope effects on the thermodynamic properties of TiX2 (X=H, D, and T) system.

应用基于密度泛函理论(DFT)和密度泛函微扰理论(DFPT)的 PWSCF和PHONONS第一原理计算程序系统研究了TiX2(X=H,D,T)系统热力学特性的同位素效应。

56. Thegeometry structures of six selected model systems 2,6-dithienyl acene oligomer(nDTA,n=0-5)are optimized by means of DFT methods with B3LYP functional at 6-31G* basis set level.

应用密度泛函理论B3LYP方法在6-31G(d)基组水平上计算了系列2,6-二噻吩基并苯齐聚物(nDTA,n=0-5)。

57. Using the density functional theory (DFT), the reaction mechanism of C4H7 with O2 was studied.

应用量子化学密度泛函理论(DFT)对丁烯自由基C4H7和O2的反应机理进行了研究。

58. Dai, B.;Zhang, G.A DFT study of h-BN compared with graphite in forming alkali metal intercalation compounds, Material Chemistry and Physics 2002, 78, 304.

张严，张桂玲，戴柏青.三元硼环、碳环和氮环比较的从头算研究,哈尔滨师范大学自然科学学报1998,14,57.

59. Goertzel algorithm is a fast algorithm of DFT.

戈泽尔算法是离散傅立叶变换的一种快速算法。

60. And the calculations coincide with DFT,PM3 and so on experiment tally well.

我们的数据表明,用分子力学计算得到的吸附能与实验值,量化计算值都相当接近。

61. Different picket-fence window causes the different signal sample length, which will bring different results for DFT.

截断窗口长度决定了信号样本长度，不同的样本长度会影响DFT的结果。

62. The DFT approach for LJ fluid is simple, quantitatively accurate in a wide range of coexistence phase and external field parameters.

所得的LJ流体的密度泛函近似计算简单，精确。

63. Based on the fixed sampling interval technique, an improved phasor computing algorithm is proposed to correct the errors caused by DFT in the presence of frequency offset.

推导出一种在定间隔采样基础上能够有效消除非额定频率下离散傅里叶变换(DFT)算法产生的频率泄漏影响的相量校正算法。

64. The restrain method of DFT frequency spectrum leakage base on signal symmetry extension is proposed in this paper, experimental results show that this method is effective.

提出一种利用信号对称拓展技术抑制离散傅立叶变换频谱泄漏的方法，实验证明是一种有效的方法。

65. Presents a fast parallel DFT processing method to improve the processing speed of the time division multiplexing digital RF memory (DRFM) system.

提出一种快速DFT处理新方法,以提高时分多路数字射频存储系统信号处理速度。

66. A identifying image methods based on machine vision and DFT are studied, The images are collected and video signal is processed using computer technology.

提出了一种基于机器视觉与离散傅里叶变换的目标特征识别方法。 利用计算机图像技术采集和处理图像信号;

67. A novel design method for the prototype filters of a Near Perfect Reconstruction(NPR) Discrete Fourier Transform(DFT)modulated filter bank is proposed.

提出了一种新的近似完全重构(NPR)离散傅立叶变换(DFT)调制滤波器组的原型滤波器设计方法。

68. A simple and practical instantaneous harmonic current detecting method is introduced,which realizes a special filter based on DFT(Discrete Fourier Transform).

提出了一种用离散傅里叶变换DFT(DiscreteFourierTransform)实现特殊滤波器的瞬时谐波电流的检测方法。

69. DFT and wavelet analysis are used to get the characteristics of a signal in this paper, including spectrum, instantaneous values of amplitude, frequency and phase.

提出增加信号的频谱作为信号的特征信息之一 ,并采用离散傅里叶变换 (DFT)和小波 (wavelet)方法提取信号的频谱、瞬时幅度、瞬时频率及瞬时相位 ,构成信号的特征向量。

70. The cyclic shift character of base phasor in DFT is proposed and approved first in this paper.

提出并证明了离散傅里叶变换的基相量循环移位性质。

71. Abstract: Quantum chemistry of phenoxy acetic acids depressants was studied at B3LYP/6-31G* level by density functional theory(DFT).

摘 要: 运用密度泛函理论(DFT) B3LYP方法， 取6-31G*基组， 对苯氧乙酸类浮选抑制剂分子进行了量子化学计算。

72. Abstract : Density functional theory (DFT) of quantum chemistry method was employed to investigate proton transfer reactions of 8-hydroxyquinoline (8-HQ) monomers and dimers.

摘要 ： 本文利用密度泛函理论研究了8-羟基喹啉单体及二聚体质子转移反应。

73. A new architecture of digital channelized receiver based on sliding DFT is presented.

摘要提出了一种基于滑动DFT的数字信道化接收机的结构设计。

74. In this paper, based on expanded-dimension parallelism of some orthogonal transform algorithms, a parallel DFT algorithm is concluded.

摘要提出某些正交变换算法具有扩维并行性，并由此归纳出扩维并行DFT算法。

75. In this paper systematic DFT calculations were carried out to study hydrogen bond cooperativity of linear and cyclic clusters consisting of up to 5 molecules of methanol at B3LYP/6-311++G(d,p) level.

摘要用DFT方法在B3LYP/6-311++G(d,P)水平下研究了甲醇线性和环状分子簇。

76. Theoretical investigations were performed to explore the electronic structure and optical properties of fluorescein using ZINDO, ab initio and DFT methods.

摘要用ZINDO、从头算和密度泛函理论方法研究荧光素及其衍生物的电子结构和光谱性质。

77. The discrete fourier transform (DFT) exists the errors.

摘要离散傅立叶变换(DFT)存在误差。

78. Boundary-scan technology (BST) is a new and effective way of test and design-for-testability (DFT) for VLSI circuits.

摘要边界扫描技术是一种新型的VLSI电路测试及可测性设计方法。

79. With the increasing of the scale of integrated circuits (IC), Design-for-Test (DFT) attracts much more attention in IC design industry, and JTAG research is one of the hot issues in DFT.

摘要随着集成电路规模的越来越大，可测性设计越来越受到业内的关注，基于JTAG标准的可测性设计是当前的研究热点之一；

80. Abstract: In this paper,the double-speed synchronous sampling method is introduce d to the power system harmonic measurement, and the corresponding algorithm mode l of DFT is deduced.

文摘:将双速率同步采样法用于电力系统谐波测量，导出相应的DFT计算模型。