四川得荣地区徐麦超基性岩体地球化学特征及成矿潜力

对四川得荣地区徐麦超基性岩体的主量元素进行了分析。结果表明,该岩体中S iO2含量为35.27%~42.25%,MgO含量34.85%~38.16%,ALK为0.019 3%~0.031 9%,m/f比值为7.06~12.78;微量元素分析成果显示其富相容元素Cr、Co、N i,几乎亏损所有的不相容元素;稀土元素球粒陨石标准化曲线显示轻稀土富集而重稀土亏损;δEu值介于0.82~12.61之间,具明显正铕异常特征。结合该岩体的地质特征,认为徐麦超基性岩体属于镁质超基性岩,含矿性较好,其成矿远景意义相对较大。     

Fermion Condensates in Lower Dimensional Gauge Theories

Combining a unitary transformation,the variational method and the exact ground state of pure gauge Hamiltonian.we investigate syst matically the vacumm structure and spintaneous chiral-symmetry breaking in (1+1) and (2+1) dimensional Hamiltonian lattice gauge theories with fermions,and obtain nice scaling behaviors for 〈ψψ〉 extending to the weak coupling regime.This paper not only reproduces well the exact value in the continuum Schwinger model,but also predicts the values for the fermion condensates in QCD₂,QED₃ and QCD₃.     

New Methods for Computer Simulations of the Scalar Models with Dynamical Fermions

The fermion-gauge-scalar models exhibit interesting chiral phase structure. To study the properties of the critical phenomena on computer, we further develop some new efficient numerical methods applicable to the chiral limit where the conventional algorithms cannot reach.     

活性炭纤维填充床脱除水中酚类化合物及填充床的再生初探

研究了活性炭纤维填充床脱除水中酚类化合物及其填充床的再生方法。结果表明当平衡浓度变化范围为0到0.8kg/m^3时,吸附等温线符合Langmuir型;用乙醇或热的NaOH稀溶液可再生被酚饱和的活性炭纤维填充床,再生效率达90％以上,建立了考虑轴向弥散、纤维内扩散和外膜传质阻力的填充床数学模型,模型由正交配置方法离散,Gear方法求解以预测穿透曲线。模型预测值与实验数据吻合较好,结果确认轴向弥散是影响活性炭纤维填充床穿透曲线的主要因素。     

Ag(PPh3)nX(n=1,2,3；X=Cl,Br,I)的电化学合成

银配合物;;三苯基膦;电合成;Ag(PPh3)nX(n=1;2;3；X=Cl;Br;I)的电化学合成     

Lattice calculation of the vector mass in the Schwinger model

Using the variational method, we calculate the mass of the vector meson in the Hamiltonian lattice Schwinger model. Our results are consistent with the exact value in the continuum.     

InN薄膜的氧化特性研究

研究了InN薄膜在不同氧气氛中的氧化特性. 研究表明，在400 ℃以下，InN薄膜很难被氧化，而金属In很容易被氧化. 因此富In的InN薄膜的氧化在400 ℃以下主要是金属In的氧化，在400 ℃以上为金属In和InN的同时被氧化. 在400 ℃以上的氧化过程中，InN的表观氧化速率非常慢，这可能和InN的高温分解有关. InN的湿氧和干氧氧化结果说明湿氧氧化速率比干氧快. 关键词： InN 氧化铟 氧化 X射线衍射     

胶囊Ca(OH)2制备及其对PVC热稳定性影响

采用界面缩聚法在CaO消化成Ca(OH)2的过程中,苯酚和甲醛反应生成的酚醛树脂原位包覆在Ca(OH)2表面,合成胶囊氢氧化钙。通过调节预聚体用量、控制反应时间和温度,借助TEM、FTIR和TG等测试结果表明,当苯酚-甲醛预聚体用量为20%,反应温度80℃,反应时间为2 h,酚醛树酯包覆的Ca(OH)2效果最佳。并采用刚果红法、DSC-TG对胶囊Ca(OH)2填充PVC复合材料进行性能研究。结果表明,添加质量分数为1%的胶囊Ca(OH)2,热稳定时间提高2倍多,且随着含量的增加热稳定时间相继提高。从SEM分析结果中可以看出,胶囊Ca(OH)2与PVC相容性有所增加。     

MOCVD生长InxGa1-Xn薄膜的表征

本文利用MOCVD方法在(0001)取向的蓝宝石衬底上实现了不同生工艺条件下的InxGa-xN薄膜的制备,并通过XRD、SEM、AFM等测量分析方法系统研究了生长工艺参数对InxGa1-xN薄膜的组分和性质的影响.InxGa1-xN薄膜的制备包括蓝宝石衬底表面上GaN缓冲层的生长以及缓冲层上InxGa1-xN薄膜的沉积两个过程.通过对所制备InxGa1-xN薄膜的XRD、SEM、AFM分析发现,调节生长温度和TMGa的流量可以有效控制InxGa1-xN薄膜中In的组分,并且随着生长温度的升高,InxGa1-xN薄膜的表面缺陷减少.     

Synthesis and Growth Mechanism： A Novel Fishing Rod-Shaped GaN Nanorods

A novel fishing rod-shaped GaN nanorod is successfully fabricated through a new method by using the two-step growth technology. This growth method is applicable to continuous synthesis and is able to produce a large number of single-crystalline GaN nanorods with a relatively high purity and at a low cost. X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy are used to characterize the as- synthesized nanorods. The results show that most of the nanorods consist of a main rod and a top curved thread. It is single-crystal GaN with hexagonal wurtzite structure. The representative photoluminescence spectrum at room temperature exhibits a strong UV light emission band centered at 370.8nm. Furthermore, a possible two-stage growth mechanism of the fishing rod-shaped GaN nanorod is also briefly discussed.