多路AVS+视频解码系统的设计

为更有效地保障数字电视系统的兼容性,数字电视监测系统需要能够解码国内市场上出现的各种标准的数字视频流.设计了基于海思Hi3716MV310的多路AVS+(Audio and decoding standard+)视频解码系统.分析了各种市场应用领域中存在的主流标准,选择了海思Hi3716mv310为解码芯片进行硬件和软件的设计;并在数字电视监测系统中进行多标准的视频流的解码.实验结果表明,该系统可成功解出多种标准的音视频码流,尤其是AVS+标准的码流,具有较高的应用价值.     

Influence of Geographical Origins on the Physicochemical Properties of Hass Avocado Oil

A study was conducted to compare the physicochemical properties of Hass avocado oil from different geographical locations (Mexico, Australia, United States and New Zealand). Regardless of geographical origins, Hass avocado pulp was characterized by high lipid content (61.27–62.66%). Among Hass avocados of different origins examined, avocado oil of New Zealand origin exhibited the lowest saponification value. The L*, a* and b* values for avocados of New Zealand origin were higher than others, translating into the oil being the lightest in color and containing more red and yellow pigments. The predominant fatty acids in the Hass avocado oil were oleic (42.59–50.97%) and palmitic (20.61–25.63%) acids, whereas the predominant triacylglycerols (TAGs) were OOO (21.41–34.69%) and POO (19.65–24.68%), where O and P denote oleic and palmitic acids, respectively. The melting curves of Hass avocado oil displayed three endothermic peaks, whereas the crystallization curves displayed two endothermic peaks. Hass avocado oil of New Zealand origin contained a significant amount of natural pigments and unsaturated compounds (unsaturated fatty acids and tri-unsaturated TAGs) than Mexico, Australia and United States origins.     

调制掺杂AlxGa1-xN/GaN异质结磁输运研究

通过低温和高磁场下的磁输运测量,首次在Ａｌ０．２２Ｇａ０．７８Ｎ／ＧａＮ异质结中观察到了舒勃尼科夫－德哈斯振荡的双周期特性,发现在Ａｌ０．２２Ｇａ０．７８Ｎ／ＧａＮ异质结的三角势阱中产生了二维电子气（２ＤＥＧ）的第二子带占据,发生第二子带占据的阈值２ＤＥＧ浓度估算为７．２＊１０＾１２ｃｍ＾－２,在阈值２ＤＥＧ浓度下第一子带和第二子带能级的距离计算为７５ｍｅＶ。     

Avocado Nutritional Diagnosis （Persea americana Mill.） ＂Hass＂, Soil Fertility and Water Quality in Ocuituco,Morelos

Morelos is the fourth in area cultivated and production volume of avocado. Of the 13 municipalities where it is farmed, Ocuituco represents 43.51% and Tetela del Volain 27.53%. Despite being one of the main fruit species in Morelos, no information related to the fertility of the soil where it is grown, the quality of water available for irrigation and nutritional status of this important fruit for the state. The study was conducted in the municipality of Ocuituco which identified three agro-habitats taking into account climate, landform, soil type and altitude. In each agro-habitat were carried out soil sampling to determine the physical and chemical characteristics based on the Mexican Official Standard NOM-021-SEMARNAT-2000, the chemical quality of water for irrigation as described by Richards （1954） and crop nutrient status of avocado ＂Hass＂ according to the methodology described by Maldonado （2002）. The soils had different physical and chemical characteristics, as well as the nutritional status of avocado trees in the three agro-habitats. The trees had excessive concentration of CI, Cu and Zn. Indices of optimal percentage deviation expressed different nutritional requirements. The water used for irrigation was of low salinity and sodium content, so it can be used without restrictions.     

LCZ（Y）20—1脱氧离心传质机的设计试制

论述了ＬＣＺ（Ｙ）２０－１脱氧离心传质机的设计原理，产品的设计参数和性能指标，产品的制造以及试验结果。     

Tunable quantum Shubnikov-de Hass oscillations in antiferromagnetic topological semimetal Mn-doped Cd3As2

Three-dimensional Dirac semimetal Cd3As2 has been considered as an excellent candidate for applica-tions of electronic devices owing to its ultrahigh mobility and air-stability.However,current researches are focused mainly on the use of gate-voltage to control its carrier transport tunability,while the manipulation of transport properties by element-doping is quite limited.Here we report the tunable magneto-transport properties by adjusting Mn-doping in the Cd3As2 compound.We find that Mn-element doping has a strong influence on the Fermi level positions,and the Fermi energy approaches to Dirac point with higher Mn-doping.More importantly,the introduction of Mn atoms transforms dia-magnetic Cd3As2 to antiferromagnetic(Cd,Mn)3As2,which provides an approach to control topological protected Dirac materials by manipulating antiferromagnetic order parameters.The Shubnikov-de Hass oscillation originates from the surface states,and the Landau fan diagram yields a nontrivial Berry phase,indicating the existence of massless Dirac fermions in the(Cd1-xMnx)3As2 compounds.Our present results may pave a way for further investigating antiferromagnetic topological Dirac semimetal and expand the potential applications in optoelectronics and spintronics.