Oxidative degradation of sunflower oil blended with roasted sesame oil during heating at frying temperature

The efficacy of roasted sesame oil(SO)on the oxidation deterioration of sunflower oil(SFO)during heating was investigated.The concentrations of SO in the SFO were 0,10%,20%,and 30%by volume.The oxidation profile of oil samples was monitored by evaluating the generation of oxidation products and chemical alterations in the oils'composition during heating at frying temperature(180℃).The results showed that the oxidation parameters(free fatty acid,peroxide value,p-anisidine value,total oxidation status,thiobarbituric acid value,and color index)increased significantly in SFO compared to blends or SO during thermal treatment.During heating,the concentration of polyunsaturated fatty acids(PUFA)was reduced with increased level of saturated fatty acids;these results were observed more in SFO than those of SO or blend oils.However,the presence of SO in SFO reduced the decomposition of PUFA.In Fourier-transform infrared spectroscopy,the peak intensities were significantly altered in SFO compared to the blend oils during heating.Based on the most analytical data,it may be agreed that the heating at frying temperature led to the generation of relatively higher contents of oxidative products in SFO compared to blend oils,showing a lower degree of oxidation occurred in blends.The best frying performance for the SFO was achieved by using 30%SO extracted from the roasted sesame seed.This study showed the proper blending of high polyunsaturated oil with SO can produce oil blends with high nutritional values and enhanced stability for daily cooking and deep-frying applications.

Influence of nitrogen and magnesium doping on the properties of ZnO films

Undoped ZnO and doped ZnO films were deposited on the MgO（111） substrates using oxygen plasma-assisted molecular beam expitaxy. The orientations of the grown ZnO thin film were investigated by in situ reflection high-energy electron diffraction and ex situ x-ray diffraction（XRD）. The film roughness was measured by atomic force microscopy, which was correlated with the grain sizes determined by XRD. Synchrotron-based x-ray absorption spectroscopy was performed to study the doping effect on the electronic properties of the ZnO films, compared with density functional theory calculations.It is found that, nitrogen doping would hinder the growth of thin film, and generate the NOdefect, while magnesium doping promotes the quality of nitrogen-doped ZnO films, inhibiting（N_2）Oproduction and increasing nitrogen content.

Special Unipotent Representations of Simple Linear Lie Groups of Type A

Let G be a special linear group over the real,the complex or the quaternion,or a special unitary group.In this note,we determine all special unipotent representations of G in the sense of Arthur and Barbasch-Vogan,and show in particular that all of them are unitarizable.

3D ball-type self-assemble CeO_(2) nanostructure produced by facile hydrothermal strategy for catalytic wet air oxidation of N,N-dimethylformamide

CeO_(2)plays an important role in heterogeneous catalysis,and its performance is highly dependent on the oxygen vacancies and surface defects,which can be easily tuned by manipulating the particle dimensions and morphology.In this article,we report a facile strategy to synthesize a new type of CeO_(2)with modified surface property which can improve its ability to active oxygen.The obtained ball-type 3D selfassemble CeO_(2)(M-CeO_(2)) is composed of large amounts of small 1D crystals which are stro ngly connected with each other.Detailed characterizations confirm its morphology,particle size and improved reducibility with abundant fraction of Ce^(3+)and more surface active oxygen when compared with CeO_(2)-nanorods and CeO_(2)-nanocubes.In the catalytic wet air oxidation(CWAO)of N,N-dimethylfo rmamide,the total organic carbon(TOC)and total nitrogen(TN)conversion of M-CeO_(2)at 180℃in 3 h are 68%and 46%,respectively,which are higher than that of CeO_(2)-nanorods and CeO_(2)-nanocubes.Besides,M-CeO_(2) presents the lowest activation energy,which is related to its modified surface property.The good stability with consecutive four reactions of M-CeO_(2)in catalytic reactions suggests its potential application in CWAO processes for industrial wastewater treatment.