http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/15671 2026-05-22T19:12:11Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/16175 Title: Tính chất dị hướng của hệ vật liệu (BI, SB)2TE Authors: Ngô, Thu Phương Abstract: The single crystals of Bi, xSb„2Te3+5 {S = 0.0 - 0.90) compounds were prepared by a Bridgman method from Te rich liquyd. The anisotropic properties of these compounds were studied. The Seebeck coefficient is reasonably isotropic for all the samples along the a- and c-axes. The resistivity is smaller along the o-axis than the c-axis. In the samples with S> 0.10, their anisotropy ratio of 4 / 4 reaches 2 - 4 . The carrier concentration n is larger for the n-type samples than the p-type with S=0 and 0.05. 2011-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/16174 Title: Phản ứng oxi hóa ot-pinen trên hệ xúc tác đa oxit VA Zr02 / MCM-41 oxitdaion of ct-pinen over oxide system v205 Zr02 / MCM-41 Authors: Trần, Thị Như Mai; Ngô, Quốc Tuấn; Nguyễn, Minh Thư; Nguyễn, Thị Hà Abstract: V205-Zr02/MCM-4I catalyst has been prepared, charactevzied by by IR, XRD, N2 adsorption, HKTEM, TPR and applied as a bifimctional catalyst to oxidation of a-pinene via a-pinene oxide using 02/H20? as an oxidant. Besides main epoxide products, the reaction leads to formation of allylic oxidation products like verbenol and verbenon. To suppress the formation of byproducts, the control of effects of temperature, time, solvent is essential for conversion of a-pinene to a-pinene oxide. 2011-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/16173 Title: Nghiên cứu quá trình tách loại Cr(VI), NI(II) trong dung dịch bằng cảm biến tính Authors: Hoàng, Thị Hương Huế; Nguyễn, Đình Bàng Abstract: The use of low cost adsorbents, agricultural byproducts (rice-bran, sugar- cane dregs...) has been investigated as a replacement for current costly methods of removing heavy metals from solution. Natural meterials or waste products from certain industries with a high capacity for heavy metal removal can be obtained, employed and disposed of with little cost. Modification of the sorbents can also improve adsorption capacity. 2011-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/16172 Title: Xử lý nước thải của quá trình sản xuất sữa bằng phương pháp hóa học Authors: Triệu, Thị Nguyệt Abstract: Waste water of Hanoi milk company was treated by oxidation method using CaOCl2 and Cao. The optimum conditions involving: pH, time and weight of CaOCl2 and CaO were studied. The obtained results were applied for the removal s2', organic compounds, smell and color in the milk waste water. The treated water is colorless and ordorless, s2" was completely removed, COD was reduced frorm 2120mg/l to 64 mg/1, which meet the requyrements of the waste water discharge standard. 2011-01-01T00:00:00Z