Fourier transform

In this study, a composite material between MnFe2O4 and activated carbon from coffee husks (MFO/AC) was synthesized using co-precipitate and hydrothermal methods to remove ammonium from aqueous solutions. The characteristics of MFO/AC were characterized and evaluated by scanning electron microscopy (SEM) and Fourier transform infrared spectra (FTIR).

9p vijiraiya 19-05-2025 2 1   Download

In this study, we propose a novel approach using the oscillation characteristics of the RMS current as the input to machine learning models, combined with the confident learning technique. Using the oscillation characteristics obtained by taking a discrete Fourier transform (DFT) of the RMS current as model input, we aim to reduce the computational requirements of the machine learning models.

12p viling 11-10-2024 4 1   Download

n this work, pectin was extracted from pomelo peel while rice husk ash was used for silica recovery. The obtained CPS were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Field emission scanning electron microscopy (FE-SEM).

8p viengfa 28-10-2024 3 1   Download

This paper studied the synthesis of calcium oxide (CaO) from snail shells by calcination, crushing, and grinding. Then, the sample was analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), specific surface area (BET), and particle size.

10p viengfa 28-10-2024 3 2   Download

In this work, ZnFe2O4 nanoparticles were synthesized by hydrothermal method while the hummer method was used to synthesize GO nanosheet. GO/ZnFe2O4 nanocomposites (GO/ZFO) were prepared by mixing GO with ZnFe2O4 in mass ratio of 1:99, respectively.

8p viengfa 28-10-2024 9 2   Download

Mời các bạn cùng tham khảo nội dung bài "Báo cáo thí nghiệm tín hiệu và hệ thống" dưới đây để nắm bắt được nội dung của 4 thí nghiệm: Bài thí nghiệm 1 Matlab, bài thí nghiệm 2 Fourier Series & Fourier Transforms, chuỗi fourier và biến đổi fourier, bài thí nghiệm 3 filtering periodic signals, lọc tín hiệu,... Hy vọng đây là tài liệu tham khảo hữu ích cho các bạn.

21p truongdmc 07-12-2015 446 37   Download

Digital Image Processing: Image Enhancement Frequency domain methods - Duong Anh Duc provides about Image Enhancement - frequency domain methods; 1-d Fourier transform of a sequence; 2-d Fourier transform of a digital image; Fourier Transform of “Rice” Image; Importance of Phase Information in Images;...

86p cocacola_08 21-11-2015 67 4   Download

After studying this chapter you will be able to: Understand how to convert the analog to digital signal, have a thorough grasp of signal processing in linear time-invariant systems, understand the z-transform and Fourier transforms in analyzing the signal and systems, be able to design and implement FIR and IIR filters.

51p youcanletgo_04 15-01-2016 78 5   Download

After studying this chapter students will be able to understand frequency analysis of signals and systems. This chapter includes content: Discrete time fourier transform DTFT, discrete fourier transform DFT, fast fourier transform FFT.

41p youcanletgo_04 15-01-2016 60 4   Download

Bài giảng "Xử lý tín hiệu số: Fourier Transform" cung cấp cho người học các kiến thức: Frequency analysis of discrete time signal, properties of Fourier transform, frequency domain characteristics of LTI systems, discrete Fourier Transform, fast Fourier Transform. Mời các bạn cùng tham khảo nội dung chi tiết.

72p doinhugiobay_13 24-01-2016 72 4   Download

Lecture Steganography: Watermarking techniques deal with contents such as the choice of host locations in the cover and the choice of a workspace, discrete Fourier transform, discrete cosine transform, Mellin-Fourier transform

11p lavender2022 22-04-2022 18 4   Download

In this investigation, neodymium orthoferrite (NdFeO3) nanoparticles has been synthesized through ultrasonic method in the presence of octanoic acid as surfactant. This method comparing to the other methods is very fast and it does not need high temperatures during the reaction.

8p tocectocec 25-05-2020 6 2   Download

In this article, magnetically nanoparticles (MNPs) of CuFe2O4 were prepared and characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction and transmission electron microscopy techniques.

10p tocectocec 25-05-2020 20 1   Download

This paper provides a method of acoustic emission (AE) technique to detect a train bearing fault of tapered bearing unit (TBU). An approach is to utilize acoustic emission signals which were captured from piezoelectric transducer and processed using Fourier transform.

6p tohitohi 19-05-2020 20 2   Download

Lecture Digital image processing - Image transforms include all of the following content: Discrete fourier transform (DFT) in 2D, wavelet transform, hough transform.

10p youcanletgo_04 17-01-2016 69 2   Download

Thành công cơ bản của công nghệ nén ảnh là giảm số lượng bit cần dùng để thể hiện ảnh với độ biến dạng cảm nhận là ít nhất.Mã hóa băng con sử dụng Wavelets là một công nghệ thể hiện tốt nhất giữa trong những công nghệ nén. Hình 1.1 dưới đây thể hiện sơ đồ khối của hệ thống nén ảnh dựa trên công nghệ wavelet. Ba khối đầu tiên của sơ đồ (DWT, quantizer and entropy coder) chịu trách nhiệm nén dữ liệu, trong khi 2 khối tiếp theo (entropy decoder, inverse discrete wavelet transform(IDWT) sẽ khôi...

31p thanhf291945 05-08-2013 158 43   Download

Thecaa3-oxidase from Thermus thermophilushas been studied with a combined electrochemical, UV/VIS and Fourier-transform infrared (FT-IR) spectroscopic approach. In this oxidase the electron donor, cytochromec, is covalently bound to subunit II of the cytochrome c oxidase. Oxidative electrochemical redox titrations in the visible spectral range yielded a midpoint potential of )0.01 ± 0.01 V (vs. Ag/AgCl/3MKCl, 0.218 V vs. SHE¢) for the hemec.

9p research12 29-04-2013 51 3   Download

Fourier transform infrared spectroscopy was performed on human leukemic daunorubicin-sensitiveK562 cells and their multiresistant counterpart derived by selection. Statistical analysis, including variable reduction and linear discrimi-nant analysis was performed on sensitive and multiresistant cells spectra in order to establish a diagnostic tool for multiresistant pattern. For each of the twomethods of data reduction tested [genetic algorithm or principal component analysis (PCA)] discriminationbetween the twocell lineswas found to be possible....

6p research12 23-04-2013 45 2   Download

The interaction of bacterial endotoxins [lipopolysaccharide (LPS) and the
endotoxic principle lipid A], with high-den-sity lipoprotein (HDL) from serum was investigated with a variety of physical techniques and biological assays. HDL exhibited an increase in the gel to liquid crystalline phase transition temperature Tc and a rigidification of the acyl chains of the endotoxins as measured by Fourier-transform infrared spectroscopy and differential scanningcalorimetry.

10p tumor12 22-04-2013 39 3   Download

Liquid chromatography mass spectrometry (LC-MS) is a valuable tool in the analysis of proteins and peptides.The combination of LC-MS with different fragmentation methods provides sequence information on components in complex mixtures.In this work, on-line packed capillary LC electrospray ionization Fourier transform ion cyclotron resonance MS was combined with two complementary fragmentation techniques, i.e.

7p tumor12 20-04-2013 50 2   Download