排序方式: 共有7条查询结果,搜索用时 15 毫秒
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提出了一种求解二维线性边值问题的新的τ_方法·对该问题进行了理论分析和数值求解·结果表明了本文方法的优点和有效性 相似文献
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ntroductionThebasictopicsofthispaperinvolvetheChebyshevτ_methodtodiscretizeaclasoflinearboundaryvalueproblemsoftheformUxx+Uyy... 相似文献
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A new τ_method is presented for the two dimensional linear boundary value problems. Theoretical and numerical analyses are presented. These results indicate that our method works nicely and efficiently. 相似文献
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Steven J. Rehse Qassem I. Mohaidat 《Spectrochimica Acta Part B: Atomic Spectroscopy》2009,64(10):1020
Four Cu–Zn brass alloys with different stoichiometries and compositions have been analyzed by laser-induced breakdown spectroscopy (LIBS) using nanosecond laser pulses. The intensities of 15 emission lines of copper, zinc, lead, carbon, and aluminum (as well as the environmental contaminants sodium and calcium) were normalized and analyzed with a discriminant function analysis (DFA) to rapidly categorize the samples by alloy. The alloys were tested sequentially in two different noble gases (argon and helium) to enhance discrimination between them. When emission intensities from samples tested sequentially in both gases were combined to form a single 30-spectral line “fingerprint” of the alloy, an overall 100% correct identification was achieved. This was a modest improvement over using emission intensities acquired in argon gas alone. A similar study was performed to demonstrate an enhanced discrimination between two strains of Escherichia coli (a Gram-negative bacterium) and a Gram-positive bacterium. When emission intensities from bacteria sequentially ablated in two different gas environments were combined, the DFA achieved a 100% categorization accuracy. This result showed the benefit of sequentially testing highly similar samples in two different ambient gases to enhance discrimination between the samples. 相似文献
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Raghib M Abu-Saris Qassem M Al-Hassan 《Journal of Mathematical Analysis and Applications》2003,283(2):468-477
In this research, we consider a difference equation of order k?2 of the following form:
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Structural,M?ssbauer spectroscopy,magnetic properties,and thermal measurements of Y(3-x)Dy_x Fe_5O_(12) 下载免费PDF全文
Mahdi Lataifeh Qassem I Mohaidat Sami H Mahmood Ibrahim Bsoul Mufeed Awawdeh Ibrahim Abu-Aljarayesh Mu'ath Altheeba 《中国物理 B》2018,(10)
Yttrium iron garnet powder samples((3-x)Dy_x Fe_5O_(12)), where part of yttrium ions are substituted by dysprosium ions with different concentrations are prepared by the solid state reaction method. The properties of the prepared samples are examined by different methods such as x-ray diffraction(XRD), Mssbauer spectroscopy, macroscopic magnetization measurements, and thermal measurements. The XRD measurements show that all the samples reveal the presence of a single garnet phase with a BCC structure. Room temperature Mssbauer spectra indicate that iron ions occupy three magnetic sites, i.e., two octahedral sites and one tetrahedral site. The saturation magnetization and the initial magnetic susceptibility decrease with the increase of Dy~(3+) substitution. The Curie temperature obtained from the thermal measurements seems to be independent of Dy~(3+) substitution. 相似文献
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