Papers by Keyword: Standard Deviation (SD)

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Authors: Wei Wang, Jun Feng Cheng
Abstract: This paper establishes competitiveness evaluation model of the service outsourcing city from six aspects and 36 indicators. Then take 20 service outsourcing demonstration cities as research objects, and use entropy weight method and the standard deviation method to calculate out comprehensive competitiveness scores of service outsourcing city. At last we analyze the present situation of the outsourcing model city and puts forward development proposals.
Authors: Woo Gon Kim, Sang Nan Yin, Woo Seog Ryu, Jong Hwa Chang
Abstract: The creep properties for the Hastelloy-X alloy which is one of candidate alloys for a high temperature gas-cooled reactor are presented. The creep data was obtained with different stresses at 950oC, and a number of the creep data was collected through literature surveys. All of the creep data were combined together to obtain the creep constants and to predict a long-term creep life. In the Norton’s creep law and the Monkman-Grant relationship, the creep constants, A, n, m, and m’ were obtained. Creep master curves based on the Larson-Miller parameter were presented for the standard deviations of 1σ, 2σ and 3σ. Creep life at each temperature was predicted for a longer-time rupture above 105 hours. Failure probability was also estimated by a statistical process of all the creep rupture data.
Authors: Sheng En Fang, Ricardo Perera, Maria Consuelo Huerta
Abstract: An environmental excitation having random characteristics may be more effective and cost-efficient than other excitation means for non-destructive damage identification purpose on most of the large-scale engineering structures under operation. In general, many existing damage indexes are constructed based on the modal properties derived firstly from the power spectral density (PSD) analysis of the structures under random excitation. However, the derivation procedures for the modal parameters usually introduce some extra errors into the indexes. This paper aims to propose a simple and feasible damage location index (DLI) constructed directly derived from the analysis results of the structural response PSD. The performance of DLI was verified using an aluminum beam with fixed ends and an experimental reinforced concrete (RC) beam under free boundary condition. Our results show that the damage location of the aluminum beam can be determined via the plot of DLI value by selecting the peaks with the amplitudes exceeding a predefined threshold value in both single- and multi-damaged scenarios. And the index may also predict the possible damage zones in the RC beam experimentally tested.
Authors: Masanori Takeda, Saroj R. Tripathi, Makoto Aoki, Norihisa Hiromoto
Abstract: We explored sources of random errors in intensity spectra measured with THz-TDS. Influences of detection accuracies, optical-delay scanning, atmospheric absorption, and intensity fluctuations of fs-laser on the detected THz pulses are discussed based on the standard deviations of measurement data. Those influences on the THz pulses are considerably small and not a predominant cause of the random error.
Authors: Li Bin Zhou, Gang Li, Guo Tai Chi
Abstract: According to the connotation of the Scientific Outlook on Development, this paper constructed the comprehensive Human All-Round Development evaluation index system, determined the optimal weights of indicators by combining G1 method and Standard Deviation method and analyzed the Human All-Round Development of 14 provinces. The contribution characteristics lie on two aspects. Firstly, through the evaluation of the quality of life, quality of human and human capital environment, economic development environment, social development and environment reflect the harmony between humans and nature, humans and the society, humans and humans. Secondly, to evaluate the human All-Round development by determining the weights of indicators in using G1 and Standard Deviation could reflect its own characteristics and indicator data expertise.
Authors: Jung Kyu Kim, Sang Soo Cho, Chul Su Kim
Authors: Bin Ouyang, Wen Qiang Ding
Abstract: Full scale sub-sample fatigue test of the mechanical components is direct relationship with the equalizing value of fatigue limit and the logarithmic standard deviation of the part. So, the full scale sub-sample fatigue test of the mechanical component plays a critical role on the assessment of the fatigue life. In this paper, the author implemented the standard deviation for the initial test data of full scale sub-samples with an epicyclic gear as example based on working standard of steeliness mechanical part. The test results declared that there were rather larger dispersion coefficients of standard deviation which influenced the safety fatigue limit of mechanical component due to a larger system errors were presence in the process of initial test. Compared to the previous test results, the safety fatigue limit of the steeliness epicyclic gear had been developed significantly by retest with reduced system errors.
Authors: T.M. Ivanova, H.U. Lubman, T.I. Savyolova, Vladimir Serebryany
Abstract: Experimental pole figures are measured by x-ray method for materials with hexagonal symmetry (Ti and Mg alloys). The Orientation Distribution Function is calculated by approximation method with central normal distribution. Texture inhomogeneities and effects of defocusing are the main sources of pole density errors. The measurement errors depend on crystal direction {hkl} and are different for maximum and minimum regions on pole figure. The influence of texture measurement errors on accuracy of the ODF calculation is investigated.
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