Phương pháp Correspondence Analysis

Phân tích tương ứng được áp dụng rất rộng rãi trong rất nhiều lĩnh vực như phân tích dữ liệu kinh doanh, điều tra xã hội học, khai phá dữ liệu,…. CA cho phép phát hiện các tri thức tiềm ẩn trong khối lượng dữ liệu lớn một cách dễ dàng thông qua phương pháp trực quan hóa (sử dụng bản đồ các điểm).

23p hoanglinh0808 13-06-2017 264 23   Download

LaMn0.5Cu0.5O3 was synthesized as nanoparticles with relatively high surface area (
19 m2/g) at low temperature (600o C) from gel precursor prepared by using polyvinyl alcohol (PVA) and corresponding metal nitrates. Influence of pH, PVA/metals mole ratio and temperature of gel formation on the crystallization of perovskites was studied. Samples were characterized by X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), transmission electron microscopy (TEM) and BET (Brunaure-Emmet-Teller) measurements.

6p uocvong01 24-09-2015 45 3   Download

La0.9Ce0.1Mn0.5Cu0.5O3 was prepared by the combustion method using polyvinyl alcohol (PVA) and corresponding metal nitrates. Samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), FT-IR spectra, transmission electron microscopy (TEM) and BET (Brunaure-Emmet-Teller) measurements. The results show that perovskite phase is formed at 600o C. Sample synthesized under optimal condition has nanostructure with large specific area.

6p uocvong01 24-09-2015 38 2   Download