The precursor of composite oxides NdCoO ₃ was synthesized from Co(NO ₃) ₂ · 6H ₂O and Nd(NO ₃) ₃ · nH ₂O with so l-gel process by microwave irradiation using tartaric acid as complexing agent and ammonia used to control the pH of reaction solution .The precursor was then characterized by TG-DTA .It shows that black powders are successfully prepared when heated at 500, 600 , 700, 800 ℃ with Ma -fufurnace .The products obtained were characterized by means  of physical techniques including IR and XRD.The results show that under different synthesis temperatures the composite oxides NdCoO ₃ with different size and integrity of crystals can be prepared .The appropriate synthesis temperature of NdCoO3 is 700 ℃.

    The analytical methods for copper and iron element in walnut oil were studied by microwave plasma torch atomic emission spectrometry (MPT - AES) using microwave plasma torch (MPT) as excitation light source , argon as supporting gas , and peneumatic nebulization sampling system. Some experimental parameters (including microwave power , carrier gas flow rate , supporting gas flow rate , oxygen shied gas flow rate , effect of acid, coexistence ions) were investigated and optimized. The linear range s o f copper and iron is 0. 05 ～ 100, 0. 1～ 100μg /m L, respectively . The detection limits is 5. 3, 22. 1ng /m L, respectively . The recoveries are both in the range of 96. 4 %～ 102. 2% and the RSD of the method is less than 3. 2%.

        The conditions of microwave extracting walnut oil w ere discussed by using the Mars5 microwave ex traction system ,including solvent, microwave extraction temperature , extraction time and the volume of ex traction solvent .According to the results of single fraction experiments, the optimized conditions of microwave extracting walnut oil w ere obtained by orthogonal experiments: extraction temperature is 60 ℃ , extraction time is 12 minutes, 7 m L the liquid volume per gram walnut .Compared with Soxhlet method and magnetic stir ring ex traction method , the results show that the time is shorten obviously(1/ 12 of the time of magnetic mix round extraction, 1/ 20 of time of Soxhlet method), the extracting temperature is 5 ℃ low er than that of conventional method .The consumption of solvent is less than magnetic mix round ex traction and the oil yield is higher than that of conventional method. Composition of fatty acid was analyzed in walnut oil by GC.There are obvious differences of composition of fatty acid between the microwave extraction oil and the conventional ex traction oil.The mass fraction of the unsaturated fatty acid is increased from 82.94 % to 90 .25 %, while the mass fraction of linoleic acid is increased from 43.49 % to 48 .23%.