VTI介质中弹性参数地震反演方法

根据地震波在具有垂直对称轴的横向各向同性（VTI）介质中的运动学特征，应用传播时间反演方法，进行了水平层状VTI介质的地层弹性参数反演方法研究。在VTI介质中，P－P波的传播时间曲线不再是双曲线，尤其在长排列情况下，已不能用二项泰勒展式精确地反演P－P波的传播时间，用三项泰勒展式则可以达到更高精度；P－SV波的传播时间也可用三项泰勒展式表达，在中等及短排列长度时可达到一定精神。对P－P波、P－SV波的传播时间进行三项泰勒展开时，它们的系数中包含了地震波的各向异性信息及垂直速度信息，中以为地震波的弹性参数反演提供提供基础，模试验分析及江苏油田某地区的二维多波资料实际反演结果表明，在最大炮间距为1．5倍地层埋深时，可以很精确地得到三项泰勒展式的系数，应用这些系数能精确反演地层弹性参数，包括P波、S波的垂直速度和各向异性参数。图4表1参5（杜丽英摘）     

Nonlinear dynamic behavior of stiffened plate under instantaneous loading

The stiffened plate subjected to both geometric and material nonlinearities under instantaneous loading is investigated by a finite element method. The effects of the two nonlinearities on the dynamic behavior of the structure are discussed. The two nonlinearities behave in different ways: the geometric nonlinearity tends to reinforce the structure stiffness owing to the resistance of the membrane forces against the bending deformation and decreases the vibration period and amplitude; while the material one possesses the function of softening the stiffness and increases the vibration period and amplitude. Thus, the dynamic behavior depends on the property of the nonlinearity which the structure experiences.     

The complexity of some reachability problems for a system on a finite group

We consider a system defined as the product of a finite set of periodic systems on cyclic groups. It is of interest to determine if certain subgroups and unions of subgroups of the state set are reachable from a specified initial state, and in particular to determine the computational complexity of verifying such reachability. These questions are motivated by certain problems that arise in the modelling and control of discrete event systems and certain forms of periodic scheduling. Our main result is that deciding whether or not the union of a certain set of subgroups is reachable or not is NP-complete.     

Order–disorder phase transition induced by swift ions in MgAl2O4 and ZnAl2O4 spinels

Grazing X-ray diffraction was used to study in details the behaviour of two spinels, ZnAl₂O₄ and MgAl₂O₄ irradiated by swift ions. Such an irradiation allows to have an important irradiated depth and then accurate diffraction diagrams. Rietveld refinement done on these diagrams clearly show an order–disorder transition due to a melting of cations under irradiation in these two spinels. More especially, these results clearly exhibit that no new phase is created under irradiation in MgAl₂O₄. Raman spectroscopy, sensitive to the crystallographic space group, seems to confirm this analysis.     

富氧氮氧化硅薄膜退火的研究

利用红外吸收(IR)谱和X射线光电子谱(XPS)对富氧氮氧化硅(oxygen-rich SiOxNy)及其在600、750和900℃下退火后样品的微结构进行了研究.实验中除观察到N、H的释放外,首次发现退火会导致SiOxNy中O的释放,同时还发现退火温度不同,H、O、N元素的释放量以及微结构的变化都不相同,根据这些现象,提出了5个化学反应过程并予以解释.     

MECHANISM OF SOUND GENERATION BY FLOW OVER TWO CAVITIES IN TWO DIMENSIONS

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＷｈｅｎｈｉｇｈ ｓｐｅｅｄａｉｒｆｌｏｗｏｒｃｕｒｒｅｎｔｐａｓｓｅｓｏｖｅｒｇａｐｓｏｒｃａｖｉｔｉｅｓｉｎａｆｌａｔｐｌａｔｅ ,ｓｅｌｆ ｅｘｃｉｔｅｄｏｓｃｉｌｌａｔｉｏｎｓｍａｙｏｃｃｕｒ ,ｌｅａｄｉｎｇｔｏｄｒａｍａｔｉｃｐｒｅｓｓｕｒｅａｎｄｖｅｌｏｃｉｔｙｆｌｕｃｔｕａｔｉｏｎａｎｄｉｎｔｅｎｓｉｖｅｎｏｉｓｅ .Ｔｈｅｓｅｐｈｅｎｏｍｅｎａｍａｙａｐｐｅａｒｉｎｍａｎｙｅｎｇｉｎｅｅｒｉｎｇａｐｐｌｉｃａｔｉｏｎｓ .Ｆｏｒｅｘａｍｐｌｅ ,ｗｅａｐｏｎｂ…     

DH-2001综合地化录井仪的研制

地化录井仪是一种采用岩石热解法快速定量评价生油岩和储油岩的设备。文章介绍了DH - 2 0 0 1综合地化录井仪的组成和功能 ,阐述了仪器硬件和软件的设计思想。实际应用证明 ,该仪器的设计先进、实用     

FH-5A 加氢精制催化剂的研制

为适应加工高硫馏分油的需要，研制成功了加氢精制催化剂FH－5A。该剂以含硅氧化铝为载体、Mo-Ni为活性组分，并添加少量助剂而制得。FH－5A工业放大催化剂在氢分压3．4MPa、空速2．5h^-1、反应温度350℃的加氢条件下在小型装置处理伊朗催化裂化柴油和沙特轻质直馏柴油的混合油（30：70），可将原料油中硫含量由9000μg/g，氮含量由432μg/g降至47μg/g。评价试验表明，FH－5A加氢精制催化剂可满足中东高硫直馏柴油、二次加工柴油及其混合柴油加氢精制的需要。     

碳酸二甲酯的市场需求和生产技术进展

介绍了碳酸二甲酯的价格、生产情况及国内外市场需求 ,指出碳酸二甲酯在我国具有极大的市场潜力。综述了生产碳酸二甲酯的三类主要方法 ,介绍了光气法、酯交换法和氧化羰基化法的各种具体方法及尚未实现工业化仍在研究中的其他方法。并对各种工业化的生产方法从技术、经济和清洁性的角度进行了分析 ,指出适合我国采用的工业合成方法是气相氧化羰基化法和甲醇与 CO2 直接合成法     

岩石工程力学特性参数测定装置设计

岩石工程力学特性参数测定装置实现了对试验载荷的恒速率加载 ,可对压模的吃深和试验载荷进行连续记录 ,记录的数据可实时显示及处理 ,且动态显示试验岩石的特性曲线 (试验载荷—轴向应变 )。该装置体积小、可移动性强 ,且能一机多用。文章详细阐述该装置机械结构、电路和系统软件的设计等