Spectral analysis

Investigating the occurrence of defects in structures is currently a major issue of significant interest. In this paper, we present experimental research findings on the relationship between the moments of the power spectrum and the presence of damage in bridge beam structures.

13p vibecca 01-10-2024 1 0   Download

Seven known compounds, including two neolignans, four lignans, and one flavane were isolated from the methanol extract of Pandanus tonkinenis fruits. Their structures were determined to be ficusal, vladinol F, medioresinol, syringaresinol, lariciresinol, secoisolariciresinol, and luteoliflavan by analysis of MS and NMR data as well as by comparison of their spectral data with those reported in the literature.

7p dianmotminh02 03-05-2024 4 2   Download

Understanding the tectonic mechanism generated by the earthquakes and faults is possible only if the preseismic, coseismic and postseismic crustal deformation related to the earthquakes is determined properly. By the analysis of continuous GPS (CGPS) coordinate time series, it is possible to estimate the crustal deformation. Besides, accelerometer records at strong motion stations (SMSs) may support the CGPS-based estimates.

18p tanmocphong 29-01-2022 17 2   Download

The Sonogashira cross-coupling reactions were used to synthesize 5 new monoalkynyl derivatives (10a-e) and 2 dialkynyl derivatives (12a-b) containing thieno[3,2-b]thiophene from monoaryl thieno[3,2-b]thiophen in moderate yield. The procedure was optimized and triphenylphosphine (0.2 eq.), palladium diacetate (0.1 eq), copper (I) iodide (0.2 eq.), THF, iPr2NH were found to be the best in these cases. The structures of the (10a-e) and (12a-b) compounds were elucidated by 1H and 13C NMR and mass spectral analysis.

9p tieuthi3006 16-03-2018 26 1   Download

Cluster analysis is an unsupervised technique of grouping related objects without considering their label or class. The objects belonging to the same cluster are relatively more homogeneous in comparison with other clusters. The application of cluster analysis is in areas like gene expression analysis, galaxy formation, natural language processing and image segmentation etc.

12p dieutringuyen 07-06-2017 37 3   Download

This thesis aimed to apply the SEM for dynamic analysis of cracked beam subjected moving harmonic force in the frequency domain. Namely, the frequency response of a cracked beam subjected to moving harmonic force is obtained explicitly and examined in dependence upon the load and crack parameters. This task is acknowledged herein spectral analysis of cracked beam subjected to moving load.

27p change00 04-05-2016 51 4   Download

From the ethanolic extract of the fresh leaves of Crinum latifolium L. four compounds: methyl (E)-p-hydroxycinnamate, ethyl (E)-3,4-dihydroxycinnamate, kaempferol-3-O- -D-glucopyrano- side, and kaempferol-3-4’-di-O- -D-glucopyranoside were isolated and identified. Their structures were established by analysis of chemical and spectral evidence.

4p uocvong04 24-09-2015 54 4   Download

Cytochrome P450foxy (P450foxy, CYP505) is a fused protein of cytochrome P450 (P450) and its reductase isolated from the fungus Fusarium oxysporum, which catalyzes the subterminal (x-1x-3) hydroxylation of fatty acids. Here, we produced, purified and characterized a fused recombinant protein (rP450foxy) using the Escherichia coli expression system. Purified rP450foxy was catalytically and spectrally indistinguishable from the native protein, but most of the rP450foxy was recovered in the soluble fraction of E. coli cells unlike the membrane-bound native protein....

8p research12 01-06-2013 55 4   Download

High hydrostatic pressure induced cold inactivation of carboxypeptidase Y. Carboxypeptidase Y was fully active when exposed to subzero temperature at 0.1 MPa; however, the enzyme became inactive when high hydrostatic pressure and subzero temperature were both applied. When the enzyme was treated at pressures higher than 300 MPa and temperatures lower than)5
C, it underwent an irreversible inactivation in which nearly 50% of the a-helical structure was lost as judged by circular dichroism spectral analysis....

9p research12 23-04-2013 41 4   Download

The structural features of the hyperthermophilic endo-b-1,3-glucanase from Pyrococcus furiosuswere studied using circular dichroism, steady-state and time-resolved fluorescence spectroscopy and anisotropy. Upon heat and chemical treatment the folded and denatured states of the protein were characterized by distinguishable spectral profiles that identified a number of conformational states.

13p fptmusic 12-04-2013 39 2   Download

Previous work from this laboratory has shown that the spectral and functional properties of a prokaryotic xanthine dehydrogenase fromComamonas acidovoransshow some similarities to those of the well-characterized eukaryotic enzymes isolated from bovine milk and from chicken liver [Xiang, Q. & Edmondson, D.E. (1996) Biochemistry35, 5441–5450]. Therefore, this system was chosen to study the factors involved in the expression of functional recombinant enzyme in Escherichia colito provide insights into the assembly of the functional Mo-pyranopterin center....

11p fptmusic 12-04-2013 39 2   Download

Computer Basics Personal Computers, Servers, Mainframes, and Supercomputers PDAs, Portable Players, and Smart Phones Microcontrollers

37p trada85 18-01-2013 53 3   Download

The infinite-dimensional unitary group U(∞) is the inductive limit of growing compact unitary groups U(N ). In this paper we solve a problem of harmonic analysis on U(∞) stated in [Ol3]. The problem consists in computing spectral decomposition for a remarkable 4-parameter family of characters of U(∞). These characters generate representations which should be viewed as analogs of nonexisting regular representation of U(∞). The spectral decomposition of a character of U(∞) is described by the spectral measure which lives on an infinite-dimensional space Ω of indecomposable characters. ...

105p noel_noel 17-01-2013 43 5   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Novel Optical Vector Spectral Analysis Technique Employing a Limited-Bandwidth Detector

8p dauphong20 11-03-2012 30 4   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Spectral Analysis of Polynomial Nonlinearity with Applications to RF Power Amplifiers

10p sting12 11-03-2012 58 5   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Localized Spectral Analysis of Fluctuating Power Generation from Solar Energy Systems

8p dauphong20 10-03-2012 42 3   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Statistical Analysis of Hyper-Spectral Data: A Non-Gaussian Approach

10p dauphong20 10-03-2012 44 3   Download

Optimal use of genome sequences and gene-expression resources requires powerful phenotyping platforms, including those for systematic analysis of metabolite composition. The most used technologies for metabolite profiling, including mass spectral, nuclear magnetic resonance and enzyme-based approaches, have various advantages and disadvantages, and problems can arise with reliability and the interpretation of the huge datasets produced. These

0p thulanh21 15-11-2011 50 1   Download

Short-Time Fourier Analysis A fundamental problem in signal analysis is to find the spectral components containedin a measuredsignal z ( t ) and/or to provide information about the time intervals when certain frequencies occur. An example of what we are looking for is a sheet of music, which clearly assigns time to frequency, see Figure 7.1. The classical Fourier analysis only partly solves the problem, because it does not allow an assignment of spectralcomponents to time. Therefore one seeks other transforms which give insight into signal properties in a different way. ...

14p doroxon 12-08-2010 110 6   Download