安宁河裂谷的“活化”

安宁河裂谷位于"攀西裂谷"的中轴部位,近期研究发现,裂谷区有显著的地壳引张作用,存在地幔隆起与热对流。通过野外实地调查,结合地球物理、断裂、沉积、地震、地应力和地形变等资料,认为安宁河裂谷区现在正处于明显的构造活化状态。这种活化受上地壳塑性流动产生的水平挤压和地幔隆起产生的应力张量的共同作用。据此提出一个新的裂谷活化地壳力源模型,认为在研究区特定的地球动力环境下,以安宁河裂谷为中心,再现岩浆活动和地壳裂陷并非不可能。     

Making continental crust: The sanukitoid connection

The average continental crust possesses intermediate compositions that typify arc magmatism and as a result it is believed to have been created at ancient convergent plate boundaries. One possible mechanism for intermediate continental crust formation is the direct production of andesitic melts in the upper mantle. Sanukitoids, which characterize the Setouchi volcanic belt, SW Japan, include unusually high-Mg andesites （HMA）. They were generated by slab melting and subsequent melt-mantle interactions under unusual tectonic settings such as where warm lithosphere subducts into hot upper mantle. Such conditions would have existed in the Archean. Hydrous HMA magmas are likely to have solidified within the crust to form HMA plutons, which were then remelted to produce differentiated sanukitoids. At present, generation and differentiation of HMA magmas may be taking place in the Izu-Bonin-Mariana arc-trench system （IBM）, because （1） HMA magmatism characterizes the initial stages of the IBM evolution and （2） the IBM middle crust exhibits Vp identical to that of the bulk conti- nental crust. Vp estimates for plutonic rocks with HMA compositions support this. However tonalitic composition for middle-crust-forming rocks cannot be ruled out, suggesting an alternative possibility that the continental crust has been created by differentiation of mantle-derived basaltic magmas.     

利用H-Kappa方法反演中国地区台站下地壳厚度

近年来,接收函数已经成为一种重要的计算地壳厚度的方法,它是利用直达P波和Moho面转换S波震相的到时和振幅差来反演计算地壳的厚度和速度结构的.本文在传统的接收函数基础上,采用了多次反射波能量扫描求极大值和波形叠加反演的方法(H-Kappa方法).该方法虽然需要较大的数据量,且要求数据的覆盖范围大,但具有能够同时快速准确地计算出地壳厚度H和Kappa值的突出优点.本文计算了中国国家台网记录到的大量震中距满足30°～90°、震级在5.5～7.0的远震P波的接收函数,从中挑选出了2 233个信噪比较高、震相清晰的接收函数进行H-Kappa方法反演.结果表明中国东部台站下方的地壳厚度为33～36 km, 中部地区的地壳厚度为38～45 km, 而青藏高原地区台站下方的地壳厚度则高达73 km左右.总体上看,青藏高原地区的地壳厚度最大,天山、准格尔盆地、内蒙古大部地区次之,中国华南沿海一带地壳厚度更小,呈现出地壳厚度自西到东逐渐减薄的规律.     

Analysis of contact melting around a horizontal elliptical cylinder heat source

The process of AT-driven contact melting of the solid phase change material （PCM） around a horizontal elliptical cylinder heat source is analyzed. Aiming at the problem existed in the published literature, namely the thickness of boundary layer tends to be infinite at φ = 90°, and considering the difference of normal angle between the horizontal elliptical cylinder surface and the solid-liquid interface of PCM, a new mathematic model is proposed, and the fundamental equations for the melting process are derived with the film theory. The new pressure distribution inside the boundary layer, the variation law of normal angle of the solid-liquid interface, the thickness of the boundary layer and the relationship between the melting velocity and resultant force are obtained. The solutions of the fundamental equations under different elliptical compression coefficients are analyzed and discussed. It is found that the thickness of the boundary layer obtained by the new model is a finite value and accords with the experimental result at φ = 90°.     

烧结矿粘结相的熔化特性

以高碱度烧结矿中的铁酸盐粘结相为研究对象,考察了粘结相的熔化特性随粘结相组成的变化规律.通过试验探讨了不同nCaO∶nFe2O3以及不同的w(Mg),w(MgO2),w(SiO2)和w(Al2O3)铁酸盐粘结相的熔化特性.结果表明,nCaO∶nFe2O3=1∶1时,粘结相的熔化温度最低,熔化时间最短;添加MgO粘结相的熔化温度升高,熔化时间变长;当w(SiO2)或w(Al2O3)为3%时,粘结相的熔化温度最低,熔化最快.     

基于LS-SVM的电炉钢水温度预测

通过对LS-SVM的参数进行优选,使所建模型具有较强的拟合和预测能力．针对某厂实际生产数据,运用LS-SVM建立钢水温度预测模型,拟合和预测结果良好,表明该模型对实际生产具有指导意义．     

焦炭在碱金属负荷条件下对炉料熔滴性能的影响

通过模拟炼铁高炉内炉料的熔滴过程,研究了焦炭在不同碱金属负荷下对熔滴过程的影响.对不同碱金属负荷与炉料的最大压差Δpmax和熔滴总特性值S的关系进行了分析.研究发现焦炭影响炉料熔滴性能主要是由于碱金属对其熔损反应的催化作用造成的.由扫描电镜观察到熔滴反应后的焦炭形貌可知,随着碱金属负荷的增加,其表面的气孔增多,气孔变大,焦炭表面被侵蚀得越来越严重,最终焦炭强度下降,甚至崩裂,最终影响到炉料的熔滴性能,使Δpmax,S值指标变差.     

大尺寸磷酸盐激光钕玻璃批量制备技术研发及应用

为满足神光装置发展和未来国家专项工程对大尺寸激光玻璃的大量需求,上海光学精密机械研究所研发了以磷酸盐激光钕玻璃连续熔炼技术为核心的大尺寸激光钕玻璃批量制备技术.大尺寸磷酸盐激光钕玻璃批量制备技术是全新的工艺技术,先后攻克了除杂质、动态除羟基、除铂颗粒、小流量大尺寸成型、隧道窑退火过程玻璃易炸裂以及包边和性能检测等一系列关键单元技术,激光玻璃的所有指标包括荧光寿命、光学损耗、光学均匀性、包边剩余反射率等均达到神光装置的使用要求.使中国成为继美国之后第二个拥有大尺寸激光钕玻璃批量制造能力的国家.采用该技术已成功研制了一千多片米级尺寸N31型激光钕玻璃,并且应用于我国的神光系列装置,在中国工程物理研究院实现了1 053 nm激光波长5 ns脉冲宽度单束能量19.6 kJ激光输出.采用本技术研制的激光钕玻璃在国防、强场激光科技前沿、激光加工和医疗领域都得到推广应用.     

PET／高岭土纳米复合材料的制备与表征

使用二甲亚砜（DMSO）改性高岭土,改性的高岭土与聚对苯二甲酸乙二酯通过熔融挤出的方法制得复合材料．利用X射线衍射（XRD）,红外光谱分析的方法验证其为纳米复合材料,再利用DSC和偏光显微镜研究该复合材料的热性能和结晶性能．     

Thermoelectric properties of quaternary Mg2Sn0.4Si0.6−xGex alloys

Quaternary alloys Mg₂Sn_0.4Si_0.6−xGe_x (x=0, 0.02, 0.05, 0.08 0.1, and 0.2) were prepared using induction melting followed by hot-pressing. Relative densities of the sintered samples were over 97% of the theoretical values. Multiple phases were detected in the samples. It was found that the Seebeck coefficient was sensitive to the content of Mg₂Ge and a maximum value of about 350 μ V.K⁻¹ was obtained. The introduction of Ge increases the electrical conductivity and the thermal conductivity simultaneously. The mechanism of this phenomenon was discussed. A maximum dimensionless figure of merit, ZT, of about 0.28 was obtained for Mg₂Sn_0.4Si_0.55Ge_0.05 at 550 K.